// Copyright (c) 2004-2013 Sergey Lyubka // Copyright (c) 2013-2014 Cesanta Software Limited // All rights reserved // // This library is dual-licensed: you can redistribute it and/or modify // it under the terms of the GNU General Public License version 2 as // published by the Free Software Foundation. For the terms of this // license, see . // // You are free to use this library under the terms of the GNU General // Public License, but WITHOUT ANY WARRANTY; without even the implied // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // See the GNU General Public License for more details. // // Alternatively, you can license this library under a commercial // license, as set out in . #ifdef NOEMBED_NET_SKELETON #include "net_skeleton.h" #else // net_skeleton start // Copyright (c) 2014 Cesanta Software Limited // All rights reserved // // This software is dual-licensed: you can redistribute it and/or modify // it under the terms of the GNU General Public License version 2 as // published by the Free Software Foundation. For the terms of this // license, see . // // You are free to use this software under the terms of the GNU General // Public License, but WITHOUT ANY WARRANTY; without even the implied // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // See the GNU General Public License for more details. // // Alternatively, you can license this software under a commercial // license, as set out in . #ifndef NS_SKELETON_HEADER_INCLUDED #define NS_SKELETON_HEADER_INCLUDED #define NS_SKELETON_VERSION "2.1.0" #undef UNICODE // Use ANSI WinAPI functions #undef _UNICODE // Use multibyte encoding on Windows #define _MBCS // Use multibyte encoding on Windows #define _INTEGRAL_MAX_BITS 64 // Enable _stati64() on Windows #define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005+ #undef WIN32_LEAN_AND_MEAN // Let windows.h always include winsock2.h #ifdef __Linux__ #define _XOPEN_SOURCE 600 // For flockfile() on Linux #endif #define __STDC_FORMAT_MACROS // wants this for C++ #define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX #ifndef _LARGEFILE_SOURCE #define _LARGEFILE_SOURCE // Enable fseeko() and ftello() functions #endif #define _FILE_OFFSET_BITS 64 // Enable 64-bit file offsets #ifdef _MSC_VER #pragma warning (disable : 4127) // FD_SET() emits warning, disable it #pragma warning (disable : 4204) // missing c99 support #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef _WIN32 #ifdef _MSC_VER #pragma comment(lib, "ws2_32.lib") // Linking with winsock library #include typedef SSIZE_T ssize_t; #endif #include #include #include #include #ifndef EINPROGRESS #define EINPROGRESS WSAEINPROGRESS #endif #ifndef EWOULDBLOCK #define EWOULDBLOCK WSAEWOULDBLOCK #endif #ifndef __func__ #define STRX(x) #x #define STR(x) STRX(x) #define __func__ __FILE__ ":" STR(__LINE__) #endif #ifndef va_copy #define va_copy(x,y) x = y #endif // MINGW #defines va_copy #define snprintf _snprintf #define vsnprintf _vsnprintf #define sleep(x) Sleep((x) * 1000) #define to64(x) _atoi64(x) typedef int socklen_t; typedef unsigned char uint8_t; typedef unsigned int uint32_t; typedef unsigned short uint16_t; typedef unsigned __int64 uint64_t; typedef __int64 int64_t; typedef SOCKET sock_t; typedef struct _stati64 ns_stat_t; #ifndef S_ISDIR #define S_ISDIR(x) ((x) & _S_IFDIR) #endif #else #include #include #include #include #include #include #include // For inet_pton() when NS_ENABLE_IPV6 is defined #include #include #include #define closesocket(x) close(x) #ifndef __OS2__ #define __cdecl #else #include typedef int socklen_t; #endif #define INVALID_SOCKET (-1) #define to64(x) strtoll(x, NULL, 10) typedef int sock_t; typedef struct stat ns_stat_t; #endif #ifdef NS_ENABLE_DEBUG #define DBG(x) do { printf("%-20s ", __func__); printf x; putchar('\n'); \ fflush(stdout); } while(0) #else #define DBG(x) #endif #ifndef ARRAY_SIZE #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) #endif #ifdef NS_ENABLE_SSL #ifdef __APPLE__ #pragma GCC diagnostic ignored "-Wdeprecated-declarations" #endif #include #else typedef void *SSL; typedef void *SSL_CTX; #endif #ifdef __cplusplus extern "C" { #endif // __cplusplus union socket_address { struct sockaddr sa; struct sockaddr_in sin; #ifdef NS_ENABLE_IPV6 struct sockaddr_in6 sin6; #else struct sockaddr sin6; #endif }; // Describes chunk of memory struct ns_str { const char *p; size_t len; }; // IO buffers interface struct iobuf { char *buf; size_t len; size_t size; }; void iobuf_init(struct iobuf *, size_t initial_size); void iobuf_free(struct iobuf *); size_t iobuf_append(struct iobuf *, const void *data, size_t data_size); void iobuf_remove(struct iobuf *, size_t data_size); void iobuf_resize(struct iobuf *, size_t new_size); // Callback function (event handler) prototype, must be defined by user. // Net skeleton will call event handler, passing events defined above. struct ns_connection; typedef void (*ns_callback_t)(struct ns_connection *, int event_num, void *evp); // Events. Meaning of event parameter (evp) is given in the comment. #define NS_POLL 0 // Sent to each connection on each call to ns_mgr_poll() #define NS_ACCEPT 1 // New connection accept()-ed. union socket_address *addr #define NS_CONNECT 2 // connect() succeeded or failed. int *success_status #define NS_RECV 3 // Data has benn received. int *num_bytes #define NS_SEND 4 // Data has been written to a socket. int *num_bytes #define NS_CLOSE 5 // Connection is closed. NULL struct ns_mgr { struct ns_connection *active_connections; const char *hexdump_file; // Debug hexdump file path sock_t ctl[2]; // Socketpair for mg_wakeup() void *user_data; // User data }; struct ns_connection { struct ns_connection *next, *prev; // ns_mgr::active_connections linkage struct ns_connection *listener; // Set only for accept()-ed connections struct ns_mgr *mgr; sock_t sock; // Socket union socket_address sa; // Peer address struct iobuf recv_iobuf; // Received data struct iobuf send_iobuf; // Data scheduled for sending SSL *ssl; SSL_CTX *ssl_ctx; void *user_data; // User-specific data void *proto_data; // Application protocol-specific data time_t last_io_time; // Timestamp of the last socket IO ns_callback_t callback; // Event handler function unsigned int flags; #define NSF_FINISHED_SENDING_DATA (1 << 0) #define NSF_BUFFER_BUT_DONT_SEND (1 << 1) #define NSF_SSL_HANDSHAKE_DONE (1 << 2) #define NSF_CONNECTING (1 << 3) #define NSF_CLOSE_IMMEDIATELY (1 << 4) #define NSF_WANT_READ (1 << 5) #define NSF_WANT_WRITE (1 << 6) #define NSF_LISTENING (1 << 7) #define NSF_UDP (1 << 8) #define NSF_USER_1 (1 << 20) #define NSF_USER_2 (1 << 21) #define NSF_USER_3 (1 << 22) #define NSF_USER_4 (1 << 23) #define NSF_USER_5 (1 << 24) #define NSF_USER_6 (1 << 25) }; void ns_mgr_init(struct ns_mgr *, void *user_data); void ns_mgr_free(struct ns_mgr *); time_t ns_mgr_poll(struct ns_mgr *, int milli); void ns_broadcast(struct ns_mgr *, ns_callback_t, void *, size_t); struct ns_connection *ns_next(struct ns_mgr *, struct ns_connection *); struct ns_connection *ns_add_sock(struct ns_mgr *, sock_t, ns_callback_t, void *); struct ns_connection *ns_bind(struct ns_mgr *, const char *, ns_callback_t, void *); struct ns_connection *ns_connect(struct ns_mgr *, const char *, ns_callback_t, void *); int ns_send(struct ns_connection *, const void *buf, size_t len); int ns_printf(struct ns_connection *, const char *fmt, ...); int ns_vprintf(struct ns_connection *, const char *fmt, va_list ap); // Utility functions void *ns_start_thread(void *(*f)(void *), void *p); int ns_socketpair(sock_t [2]); int ns_socketpair2(sock_t [2], int sock_type); // SOCK_STREAM or SOCK_DGRAM void ns_set_close_on_exec(sock_t); void ns_sock_to_str(sock_t sock, char *buf, size_t len, int flags); int ns_hexdump(const void *buf, int len, char *dst, int dst_len); int ns_avprintf(char **buf, size_t size, const char *fmt, va_list ap); int ns_resolve(const char *domain_name, char *ip_addr_buf, size_t buf_len); #ifdef __cplusplus } #endif // __cplusplus #endif // NS_SKELETON_HEADER_INCLUDED // Copyright (c) 2014 Cesanta Software Limited // All rights reserved // // This software is dual-licensed: you can redistribute it and/or modify // it under the terms of the GNU General Public License version 2 as // published by the Free Software Foundation. For the terms of this // license, see . // // You are free to use this software under the terms of the GNU General // Public License, but WITHOUT ANY WARRANTY; without even the implied // warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // See the GNU General Public License for more details. // // Alternatively, you can license this software under a commercial // license, as set out in . // // $Date: 2014-09-28 05:04:41 UTC $ #ifndef NS_MALLOC #define NS_MALLOC malloc #endif #ifndef NS_REALLOC #define NS_REALLOC realloc #endif #ifndef NS_FREE #define NS_FREE free #endif #ifndef NS_CALLOC #define NS_CALLOC calloc #endif #define NS_CTL_MSG_MESSAGE_SIZE (8 * 1024) #define NS_READ_BUFFER_SIZE 2048 #define NS_UDP_RECEIVE_BUFFER_SIZE 2000 #define NS_VPRINTF_BUFFER_SIZE 500 struct ctl_msg { ns_callback_t callback; char message[NS_CTL_MSG_MESSAGE_SIZE]; }; void iobuf_resize(struct iobuf *io, size_t new_size) { char *p; if ((new_size > io->size || (new_size < io->size && new_size >= io->len)) && (p = (char *) NS_REALLOC(io->buf, new_size)) != NULL) { io->size = new_size; io->buf = p; } } void iobuf_init(struct iobuf *iobuf, size_t initial_size) { iobuf->len = iobuf->size = 0; iobuf->buf = NULL; iobuf_resize(iobuf, initial_size); } void iobuf_free(struct iobuf *iobuf) { if (iobuf != NULL) { if (iobuf->buf != NULL) NS_FREE(iobuf->buf); iobuf_init(iobuf, 0); } } size_t iobuf_append(struct iobuf *io, const void *buf, size_t len) { char *p = NULL; assert(io != NULL); assert(io->len <= io->size); /* check overflow */ if (len > ~(size_t)0 - (size_t)(io->buf + io->len)) { return 0; } if (len <= 0) { } else if (io->len + len <= io->size) { memcpy(io->buf + io->len, buf, len); io->len += len; } else if ((p = (char *) NS_REALLOC(io->buf, io->len + len)) != NULL) { io->buf = p; memcpy(io->buf + io->len, buf, len); io->len += len; io->size = io->len; } else { len = 0; } return len; } void iobuf_remove(struct iobuf *io, size_t n) { if (n > 0 && n <= io->len) { memmove(io->buf, io->buf + n, io->len - n); io->len -= n; } } static size_t ns_out(struct ns_connection *nc, const void *buf, size_t len) { if (nc->flags & NSF_UDP) { long n = sendto(nc->sock, (const char *) buf, len, 0, &nc->sa.sa, sizeof(nc->sa.sin)); DBG(("%p %d send %ld (%d %s)", nc, nc->sock, n, errno, strerror(errno))); return n < 0 ? 0 : n; } else { return iobuf_append(&nc->send_iobuf, buf, len); } } #ifndef NS_DISABLE_THREADS void *ns_start_thread(void *(*f)(void *), void *p) { #ifdef _WIN32 return (void *) _beginthread((void (__cdecl *)(void *)) f, 0, p); #else pthread_t thread_id = (pthread_t) 0; pthread_attr_t attr; (void) pthread_attr_init(&attr); (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); #if defined(NS_STACK_SIZE) && NS_STACK_SIZE > 1 (void) pthread_attr_setstacksize(&attr, NS_STACK_SIZE); #endif pthread_create(&thread_id, &attr, f, p); pthread_attr_destroy(&attr); return (void *) thread_id; #endif } #endif // NS_DISABLE_THREADS static void ns_add_conn(struct ns_mgr *mgr, struct ns_connection *c) { c->next = mgr->active_connections; mgr->active_connections = c; c->prev = NULL; if (c->next != NULL) c->next->prev = c; } static void ns_remove_conn(struct ns_connection *conn) { if (conn->prev == NULL) conn->mgr->active_connections = conn->next; if (conn->prev) conn->prev->next = conn->next; if (conn->next) conn->next->prev = conn->prev; } // Print message to buffer. If buffer is large enough to hold the message, // return buffer. If buffer is to small, allocate large enough buffer on heap, // and return allocated buffer. int ns_avprintf(char **buf, size_t size, const char *fmt, va_list ap) { va_list ap_copy; int len; va_copy(ap_copy, ap); len = vsnprintf(*buf, size, fmt, ap_copy); va_end(ap_copy); if (len < 0) { // eCos and Windows are not standard-compliant and return -1 when // the buffer is too small. Keep allocating larger buffers until we // succeed or out of memory. *buf = NULL; while (len < 0) { if (*buf) NS_FREE(*buf); size *= 2; if ((*buf = (char *) NS_MALLOC(size)) == NULL) break; va_copy(ap_copy, ap); len = vsnprintf(*buf, size, fmt, ap_copy); va_end(ap_copy); } } else if (len > (int) size) { // Standard-compliant code path. Allocate a buffer that is large enough. if ((*buf = (char *) NS_MALLOC(len + 1)) == NULL) { len = -1; } else { va_copy(ap_copy, ap); len = vsnprintf(*buf, len + 1, fmt, ap_copy); va_end(ap_copy); } } return len; } int ns_vprintf(struct ns_connection *nc, const char *fmt, va_list ap) { char mem[NS_VPRINTF_BUFFER_SIZE], *buf = mem; int len; if ((len = ns_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) { ns_out(nc, buf, len); } if (buf != mem && buf != NULL) { NS_FREE(buf); } return len; } int ns_printf(struct ns_connection *conn, const char *fmt, ...) { int len; va_list ap; va_start(ap, fmt); len = ns_vprintf(conn, fmt, ap); va_end(ap); return len; } static void hexdump(struct ns_connection *nc, const char *path, int num_bytes, int ev) { const struct iobuf *io = ev == NS_SEND ? &nc->send_iobuf : &nc->recv_iobuf; FILE *fp; char *buf, src[60], dst[60]; int buf_size = num_bytes * 5 + 100; if ((fp = fopen(path, "a")) != NULL) { ns_sock_to_str(nc->sock, src, sizeof(src), 3); ns_sock_to_str(nc->sock, dst, sizeof(dst), 7); fprintf(fp, "%lu %p %s %s %s %d\n", (unsigned long) time(NULL), nc->user_data, src, ev == NS_RECV ? "<-" : ev == NS_SEND ? "->" : ev == NS_ACCEPT ? "" : "XX", dst, num_bytes); if (num_bytes > 0 && (buf = (char *) NS_MALLOC(buf_size)) != NULL) { ns_hexdump(io->buf + (ev == NS_SEND ? 0 : io->len) - (ev == NS_SEND ? 0 : num_bytes), num_bytes, buf, buf_size); fprintf(fp, "%s", buf); NS_FREE(buf); } fclose(fp); } } static void ns_call(struct ns_connection *nc, int ev, void *p) { if (nc->mgr->hexdump_file != NULL && ev != NS_POLL) { int len = (ev == NS_RECV || ev == NS_SEND) ? * (int *) p : 0; hexdump(nc, nc->mgr->hexdump_file, len, ev); } nc->callback(nc, ev, p); } static void ns_destroy_conn(struct ns_connection *conn) { closesocket(conn->sock); iobuf_free(&conn->recv_iobuf); iobuf_free(&conn->send_iobuf); #ifdef NS_ENABLE_SSL if (conn->ssl != NULL) { SSL_free(conn->ssl); } if (conn->ssl_ctx != NULL) { SSL_CTX_free(conn->ssl_ctx); } #endif NS_FREE(conn); } static void ns_close_conn(struct ns_connection *conn) { DBG(("%p %d", conn, conn->flags)); ns_call(conn, NS_CLOSE, NULL); ns_remove_conn(conn); ns_destroy_conn(conn); } void ns_set_close_on_exec(sock_t sock) { #ifdef _WIN32 (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0); #else fcntl(sock, F_SETFD, FD_CLOEXEC); #endif } static void ns_set_non_blocking_mode(sock_t sock) { #ifdef _WIN32 unsigned long on = 1; ioctlsocket(sock, FIONBIO, &on); #else int flags = fcntl(sock, F_GETFL, 0); fcntl(sock, F_SETFL, flags | O_NONBLOCK); #endif } #ifndef NS_DISABLE_SOCKETPAIR int ns_socketpair2(sock_t sp[2], int sock_type) { union socket_address sa; sock_t sock; socklen_t len = sizeof(sa.sin); int ret = 0; sp[0] = sp[1] = INVALID_SOCKET; (void) memset(&sa, 0, sizeof(sa)); sa.sin.sin_family = AF_INET; sa.sin.sin_port = htons(0); sa.sin.sin_addr.s_addr = htonl(0x7f000001); if ((sock = socket(AF_INET, sock_type, 0)) != INVALID_SOCKET && !bind(sock, &sa.sa, len) && (sock_type == SOCK_DGRAM || !listen(sock, 1)) && !getsockname(sock, &sa.sa, &len) && (sp[0] = socket(AF_INET, sock_type, 0)) != INVALID_SOCKET && !connect(sp[0], &sa.sa, len) && (sock_type == SOCK_STREAM || (!getsockname(sp[0], &sa.sa, &len) && !connect(sock, &sa.sa, len))) && (sp[1] = (sock_type == SOCK_DGRAM ? sock : accept(sock, &sa.sa, &len))) != INVALID_SOCKET) { ns_set_close_on_exec(sp[0]); ns_set_close_on_exec(sp[1]); ret = 1; } else { if (sp[0] != INVALID_SOCKET) closesocket(sp[0]); if (sp[1] != INVALID_SOCKET) closesocket(sp[1]); sp[0] = sp[1] = INVALID_SOCKET; } if (sock_type != SOCK_DGRAM) closesocket(sock); return ret; } int ns_socketpair(sock_t sp[2]) { return ns_socketpair2(sp, SOCK_STREAM); } #endif // NS_DISABLE_SOCKETPAIR // TODO(lsm): use non-blocking resolver static int ns_resolve2(const char *host, struct in_addr *ina) { #ifdef NS_ENABLE_GETADDRINFO int rv = 0; struct addrinfo hints, *servinfo, *p; struct sockaddr_in *h = NULL; char *ip = NS_MALLOC(17); memset(ip, '\0', 17); memset(&hints, 0, sizeof hints); hints.ai_family = AF_INET; hints.ai_socktype = SOCK_STREAM; if((rv = getaddrinfo(host, NULL , NULL, &servinfo)) != 0) { DBG(("getaddrinfo(%s) failed: %s", host, strerror(errno))); return 0; } for(p = servinfo; p != NULL; p = p->ai_next) { memcpy(&h, &p->ai_addr, sizeof(struct sockaddr_in *)); memcpy(ina, &h->sin_addr, sizeof(ina)); } freeaddrinfo(servinfo); return 1; #else struct hostent *he; if ((he = gethostbyname(host)) == NULL) { DBG(("gethostbyname(%s) failed: %s", host, strerror(errno))); } else { memcpy(ina, he->h_addr_list[0], sizeof(*ina)); return 1; } return 0; #endif } // Resolve FDQN "host", store IP address in the "ip". // Return > 0 (IP address length) on success. int ns_resolve(const char *host, char *buf, size_t n) { struct in_addr ad; return ns_resolve2(host, &ad) ? snprintf(buf, n, "%s", inet_ntoa(ad)) : 0; } // Address format: [PROTO://][IP_ADDRESS:]PORT[:CERT][:CA_CERT] static int ns_parse_address(const char *str, union socket_address *sa, int *proto, int *use_ssl, char *cert, char *ca) { unsigned int a, b, c, d, port; int n = 0, len = 0; char host[200]; #ifdef NS_ENABLE_IPV6 char buf[100]; #endif // MacOS needs that. If we do not zero it, subsequent bind() will fail. // Also, all-zeroes in the socket address means binding to all addresses // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT). memset(sa, 0, sizeof(*sa)); sa->sin.sin_family = AF_INET; *proto = SOCK_STREAM; *use_ssl = 0; cert[0] = ca[0] = '\0'; if (memcmp(str, "ssl://", 6) == 0) { str += 6; *use_ssl = 1; } else if (memcmp(str, "udp://", 6) == 0) { str += 6; *proto = SOCK_DGRAM; } else if (memcmp(str, "tcp://", 6) == 0) { str += 6; } if (sscanf(str, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) { // Bind to a specific IPv4 address, e.g. 192.168.1.5:8080 sa->sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d); sa->sin.sin_port = htons((uint16_t) port); #ifdef NS_ENABLE_IPV6 } else if (sscanf(str, "[%99[^]]]:%u%n", buf, &port, &len) == 2 && inet_pton(AF_INET6, buf, &sa->sin6.sin6_addr)) { // IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080 sa->sin6.sin6_family = AF_INET6; sa->sin6.sin6_port = htons((uint16_t) port); #endif } else if (sscanf(str, "%199[^ :]:%u%n", host, &port, &len) == 2) { sa->sin.sin_port = htons((uint16_t) port); ns_resolve2(host, &sa->sin.sin_addr); } else if (sscanf(str, "%u%n", &port, &len) == 1) { // If only port is specified, bind to IPv4, INADDR_ANY sa->sin.sin_port = htons((uint16_t) port); } if (*use_ssl && (sscanf(str + len, ":%99[^:,]:%99[^:,]%n", cert, ca, &n) == 2 || sscanf(str + len, ":%99[^:,]%n", cert, &n) == 1)) { len += n; } return port < 0xffff && str[len] == '\0' ? len : 0; } // 'sa' must be an initialized address to bind to static sock_t ns_open_listening_socket(union socket_address *sa, int proto) { socklen_t sa_len = (sa->sa.sa_family == AF_INET) ? sizeof(sa->sin) : sizeof(sa->sin6); sock_t sock = INVALID_SOCKET; #ifndef _WIN32 int on = 1; #endif if ((sock = socket(sa->sa.sa_family, proto, 0)) != INVALID_SOCKET && #ifndef _WIN32 // SO_RESUSEADDR is not enabled on Windows because the semantics of // SO_REUSEADDR on UNIX and Windows is different. On Windows, // SO_REUSEADDR allows to bind a socket to a port without error even if // the port is already open by another program. This is not the behavior // SO_REUSEADDR was designed for, and leads to hard-to-track failure // scenarios. Therefore, SO_REUSEADDR was disabled on Windows. !setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &on, sizeof(on)) && #endif !bind(sock, &sa->sa, sa_len) && (proto == SOCK_DGRAM || listen(sock, SOMAXCONN) == 0)) { ns_set_non_blocking_mode(sock); // In case port was set to 0, get the real port number (void) getsockname(sock, &sa->sa, &sa_len); } else if (sock != INVALID_SOCKET) { closesocket(sock); sock = INVALID_SOCKET; } return sock; } #ifdef NS_ENABLE_SSL // Certificate generation script is at // https://github.com/cesanta/net_skeleton/blob/master/scripts/gen_certs.sh static int ns_use_ca_cert(SSL_CTX *ctx, const char *cert) { if (ctx == NULL) { return -1; } else if (cert == NULL || cert[0] == '\0') { return 0; } SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0); return SSL_CTX_load_verify_locations(ctx, cert, NULL) == 1 ? 0 : -2; } static int ns_use_cert(SSL_CTX *ctx, const char *pem_file) { if (ctx == NULL) { return -1; } else if (pem_file == NULL || pem_file[0] == '\0') { return 0; } else if (SSL_CTX_use_certificate_file(ctx, pem_file, 1) == 0 || SSL_CTX_use_PrivateKey_file(ctx, pem_file, 1) == 0) { return -2; } else { SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); SSL_CTX_use_certificate_chain_file(ctx, pem_file); return 0; } } #endif // NS_ENABLE_SSL struct ns_connection *ns_bind(struct ns_mgr *srv, const char *str, ns_callback_t callback, void *user_data) { union socket_address sa; struct ns_connection *nc = NULL; int use_ssl, proto; char cert[100], ca_cert[100]; sock_t sock; ns_parse_address(str, &sa, &proto, &use_ssl, cert, ca_cert); if (use_ssl && cert[0] == '\0') return NULL; if ((sock = ns_open_listening_socket(&sa, proto)) == INVALID_SOCKET) { } else if ((nc = ns_add_sock(srv, sock, callback, NULL)) == NULL) { closesocket(sock); } else { nc->sa = sa; nc->flags |= NSF_LISTENING; nc->user_data = user_data; nc->callback = callback; if (proto == SOCK_DGRAM) { nc->flags |= NSF_UDP; } #ifdef NS_ENABLE_SSL if (use_ssl) { nc->ssl_ctx = SSL_CTX_new(SSLv23_server_method()); if (ns_use_cert(nc->ssl_ctx, cert) != 0 || ns_use_ca_cert(nc->ssl_ctx, ca_cert) != 0) { ns_close_conn(nc); nc = NULL; } } #endif DBG(("%p sock %d/%d ssl %p %p", nc, sock, proto, nc->ssl_ctx, nc->ssl)); } return nc; } static struct ns_connection *accept_conn(struct ns_connection *ls) { struct ns_connection *c = NULL; union socket_address sa; socklen_t len = sizeof(sa); sock_t sock = INVALID_SOCKET; // NOTE(lsm): on Windows, sock is always > FD_SETSIZE if ((sock = accept(ls->sock, &sa.sa, &len)) == INVALID_SOCKET) { } else if ((c = ns_add_sock(ls->mgr, sock, ls->callback, ls->user_data)) == NULL) { closesocket(sock); #ifdef NS_ENABLE_SSL } else if (ls->ssl_ctx != NULL && ((c->ssl = SSL_new(ls->ssl_ctx)) == NULL || SSL_set_fd(c->ssl, sock) != 1)) { DBG(("SSL error")); ns_close_conn(c); c = NULL; #endif } else { c->listener = ls; c->proto_data = ls->proto_data; ns_call(c, NS_ACCEPT, &sa); DBG(("%p %d %p %p", c, c->sock, c->ssl_ctx, c->ssl)); } return c; } static int ns_is_error(int n) { return n == 0 || (n < 0 && errno != EINTR && errno != EINPROGRESS && errno != EAGAIN && errno != EWOULDBLOCK #ifdef _WIN32 && WSAGetLastError() != WSAEINTR && WSAGetLastError() != WSAEWOULDBLOCK #endif ); } void ns_sock_to_str(sock_t sock, char *buf, size_t len, int flags) { union socket_address sa; socklen_t slen = sizeof(sa); if (buf != NULL && len > 0) { buf[0] = '\0'; memset(&sa, 0, sizeof(sa)); if (flags & 4) { getpeername(sock, &sa.sa, &slen); } else { getsockname(sock, &sa.sa, &slen); } if (flags & 1) { #if defined(NS_ENABLE_IPV6) inet_ntop(sa.sa.sa_family, sa.sa.sa_family == AF_INET ? (void *) &sa.sin.sin_addr : (void *) &sa.sin6.sin6_addr, buf, len); #elif defined(_WIN32) // Only Windoze Vista (and newer) have inet_ntop() strncpy(buf, inet_ntoa(sa.sin.sin_addr), len); #else inet_ntop(sa.sa.sa_family, (void *) &sa.sin.sin_addr, buf,(socklen_t)len); #endif } if (flags & 2) { snprintf(buf + strlen(buf), len - (strlen(buf) + 1), "%s%d", flags & 1 ? ":" : "", (int) ntohs(sa.sin.sin_port)); } } } int ns_hexdump(const void *buf, int len, char *dst, int dst_len) { const unsigned char *p = (const unsigned char *) buf; char ascii[17] = ""; int i, idx, n = 0; for (i = 0; i < len; i++) { idx = i % 16; if (idx == 0) { if (i > 0) n += snprintf(dst + n, dst_len - n, " %s\n", ascii); n += snprintf(dst + n, dst_len - n, "%04x ", i); } n += snprintf(dst + n, dst_len - n, " %02x", p[i]); ascii[idx] = p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i]; ascii[idx + 1] = '\0'; } while (i++ % 16) n += snprintf(dst + n, dst_len - n, "%s", " "); n += snprintf(dst + n, dst_len - n, " %s\n\n", ascii); return n; } #ifdef NS_ENABLE_SSL static int ns_ssl_err(struct ns_connection *conn, int res) { int ssl_err = SSL_get_error(conn->ssl, res); if (ssl_err == SSL_ERROR_WANT_READ) conn->flags |= NSF_WANT_READ; if (ssl_err == SSL_ERROR_WANT_WRITE) conn->flags |= NSF_WANT_WRITE; return ssl_err; } #endif static void ns_read_from_socket(struct ns_connection *conn) { char buf[NS_READ_BUFFER_SIZE]; int n = 0; if (conn->flags & NSF_CONNECTING) { int ok = 1, ret; socklen_t len = sizeof(ok); ret = getsockopt(conn->sock, SOL_SOCKET, SO_ERROR, (char *) &ok, &len); (void) ret; #ifdef NS_ENABLE_SSL if (ret == 0 && ok == 0 && conn->ssl != NULL) { int res = SSL_connect(conn->ssl); int ssl_err = ns_ssl_err(conn, res); if (res == 1) { conn->flags |= NSF_SSL_HANDSHAKE_DONE; } else if (ssl_err == SSL_ERROR_WANT_READ || ssl_err == SSL_ERROR_WANT_WRITE) { return; // Call us again } else { ok = 1; } conn->flags &= ~(NSF_WANT_READ | NSF_WANT_WRITE); } #endif conn->flags &= ~NSF_CONNECTING; DBG(("%p ok=%d", conn, ok)); if (ok != 0) { conn->flags |= NSF_CLOSE_IMMEDIATELY; } ns_call(conn, NS_CONNECT, &ok); return; } #ifdef NS_ENABLE_SSL if (conn->ssl != NULL) { if (conn->flags & NSF_SSL_HANDSHAKE_DONE) { // SSL library may have more bytes ready to read then we ask to read. // Therefore, read in a loop until we read everything. Without the loop, // we skip to the next select() cycle which can just timeout. while ((n = SSL_read(conn->ssl, buf, sizeof(buf))) > 0) { DBG(("%p %d <- %d bytes (SSL)", conn, conn->flags, n)); iobuf_append(&conn->recv_iobuf, buf, n); ns_call(conn, NS_RECV, &n); } ns_ssl_err(conn, n); } else { int res = SSL_accept(conn->ssl); int ssl_err = ns_ssl_err(conn, res); if (res == 1) { conn->flags |= NSF_SSL_HANDSHAKE_DONE; conn->flags &= ~(NSF_WANT_READ | NSF_WANT_WRITE); } else if (ssl_err == SSL_ERROR_WANT_READ || ssl_err == SSL_ERROR_WANT_WRITE) { return; // Call us again } else { conn->flags |= NSF_CLOSE_IMMEDIATELY; } return; } } else #endif { while ((n = (int) recv(conn->sock, buf, sizeof(buf), 0)) > 0) { DBG(("%p %d <- %d bytes (PLAIN)", conn, conn->flags, n)); iobuf_append(&conn->recv_iobuf, buf, n); ns_call(conn, NS_RECV, &n); } } if (ns_is_error(n)) { conn->flags |= NSF_CLOSE_IMMEDIATELY; } } static void ns_write_to_socket(struct ns_connection *conn) { struct iobuf *io = &conn->send_iobuf; int n = 0; #ifdef NS_ENABLE_SSL if (conn->ssl != NULL) { n = SSL_write(conn->ssl, io->buf, io->len); if (n <= 0) { int ssl_err = ns_ssl_err(conn, n); if (ssl_err == SSL_ERROR_WANT_READ || ssl_err == SSL_ERROR_WANT_WRITE) { return; // Call us again } else { conn->flags |= NSF_CLOSE_IMMEDIATELY; } } else { conn->flags &= ~(NSF_WANT_READ | NSF_WANT_WRITE); } } else #endif { n = (int) send(conn->sock, io->buf, io->len, 0); } DBG(("%p %d -> %d bytes", conn, conn->flags, n)); ns_call(conn, NS_SEND, &n); if (ns_is_error(n)) { conn->flags |= NSF_CLOSE_IMMEDIATELY; } else if (n > 0) { iobuf_remove(io, n); } } int ns_send(struct ns_connection *conn, const void *buf, size_t len) { return (int) ns_out(conn, buf, len); } static void ns_handle_udp(struct ns_connection *ls) { struct ns_connection nc; char buf[NS_UDP_RECEIVE_BUFFER_SIZE]; ssize_t n; socklen_t s_len = sizeof(nc.sa); memset(&nc, 0, sizeof(nc)); n = recvfrom(ls->sock, buf, sizeof(buf), 0, &nc.sa.sa, &s_len); if (n <= 0) { DBG(("%p recvfrom: %s", ls, strerror(errno))); } else { nc.mgr = ls->mgr; nc.recv_iobuf.buf = buf; nc.recv_iobuf.len = nc.recv_iobuf.size = n; nc.sock = ls->sock; nc.callback = ls->callback; nc.user_data = ls->user_data; nc.proto_data = ls->proto_data; nc.mgr = ls->mgr; nc.listener = ls; nc.flags = NSF_UDP; DBG(("%p %d bytes received", ls, n)); ns_call(&nc, NS_RECV, &n); } } static void ns_add_to_set(sock_t sock, fd_set *set, sock_t *max_fd) { if (sock != INVALID_SOCKET) { FD_SET(sock, set); if (*max_fd == INVALID_SOCKET || sock > *max_fd) { *max_fd = sock; } } } time_t ns_mgr_poll(struct ns_mgr *mgr, int milli) { struct ns_connection *conn, *tmp_conn; struct timeval tv; fd_set read_set, write_set; sock_t max_fd = INVALID_SOCKET; time_t current_time = time(NULL); FD_ZERO(&read_set); FD_ZERO(&write_set); ns_add_to_set(mgr->ctl[1], &read_set, &max_fd); for (conn = mgr->active_connections; conn != NULL; conn = tmp_conn) { tmp_conn = conn->next; if (!(conn->flags & (NSF_LISTENING | NSF_CONNECTING))) { ns_call(conn, NS_POLL, ¤t_time); } if (conn->flags & NSF_CLOSE_IMMEDIATELY) { ns_close_conn(conn); } else { if (!(conn->flags & NSF_WANT_WRITE)) { //DBG(("%p read_set", conn)); ns_add_to_set(conn->sock, &read_set, &max_fd); } if (((conn->flags & NSF_CONNECTING) && !(conn->flags & NSF_WANT_READ)) || (conn->send_iobuf.len > 0 && !(conn->flags & NSF_CONNECTING) && !(conn->flags & NSF_BUFFER_BUT_DONT_SEND))) { //DBG(("%p write_set", conn)); ns_add_to_set(conn->sock, &write_set, &max_fd); } } } tv.tv_sec = milli / 1000; tv.tv_usec = (milli % 1000) * 1000; if (select((int) max_fd + 1, &read_set, &write_set, NULL, &tv) > 0) { // select() might have been waiting for a long time, reset current_time // now to prevent last_io_time being set to the past. current_time = time(NULL); // Read wakeup messages if (mgr->ctl[1] != INVALID_SOCKET && FD_ISSET(mgr->ctl[1], &read_set)) { struct ctl_msg ctl_msg; int len = (int) recv(mgr->ctl[1], (char *) &ctl_msg, sizeof(ctl_msg), 0); send(mgr->ctl[1], ctl_msg.message, 1, 0); if (len >= (int) sizeof(ctl_msg.callback) && ctl_msg.callback != NULL) { struct ns_connection *c; for (c = ns_next(mgr, NULL); c != NULL; c = ns_next(mgr, c)) { ctl_msg.callback(c, NS_POLL, ctl_msg.message); } } } for (conn = mgr->active_connections; conn != NULL; conn = tmp_conn) { tmp_conn = conn->next; if (FD_ISSET(conn->sock, &read_set)) { if (conn->flags & NSF_LISTENING) { if (conn->flags & NSF_UDP) { ns_handle_udp(conn); } else { // We're not looping here, and accepting just one connection at // a time. The reason is that eCos does not respect non-blocking // flag on a listening socket and hangs in a loop. accept_conn(conn); } } else { conn->last_io_time = current_time; ns_read_from_socket(conn); } } if (FD_ISSET(conn->sock, &write_set)) { if (conn->flags & NSF_CONNECTING) { ns_read_from_socket(conn); } else if (!(conn->flags & NSF_BUFFER_BUT_DONT_SEND)) { conn->last_io_time = current_time; ns_write_to_socket(conn); } } } } for (conn = mgr->active_connections; conn != NULL; conn = tmp_conn) { tmp_conn = conn->next; if ((conn->flags & NSF_CLOSE_IMMEDIATELY) || (conn->send_iobuf.len == 0 && (conn->flags & NSF_FINISHED_SENDING_DATA))) { ns_close_conn(conn); } } return current_time; } struct ns_connection *ns_connect(struct ns_mgr *mgr, const char *address, ns_callback_t callback, void *user_data) { sock_t sock = INVALID_SOCKET; struct ns_connection *nc = NULL; union socket_address sa; char cert[100], ca_cert[100]; int rc, use_ssl, proto; ns_parse_address(address, &sa, &proto, &use_ssl, cert, ca_cert); if ((sock = socket(AF_INET, proto, 0)) == INVALID_SOCKET) { return NULL; } ns_set_non_blocking_mode(sock); rc = (proto == SOCK_DGRAM) ? 0 : connect(sock, &sa.sa, sizeof(sa.sin)); if (rc != 0 && ns_is_error(rc)) { closesocket(sock); return NULL; } else if ((nc = ns_add_sock(mgr, sock, callback, user_data)) == NULL) { closesocket(sock); return NULL; } nc->sa = sa; // Important, cause UDP conns will use sendto() nc->flags = (proto == SOCK_DGRAM) ? NSF_UDP : NSF_CONNECTING; #ifdef NS_ENABLE_SSL if (use_ssl) { if ((nc->ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL || ns_use_cert(nc->ssl_ctx, cert) != 0 || ns_use_ca_cert(nc->ssl_ctx, ca_cert) != 0 || (nc->ssl = SSL_new(nc->ssl_ctx)) == NULL) { ns_close_conn(nc); return NULL; } else { SSL_set_fd(nc->ssl, sock); } } #endif return nc; } struct ns_connection *ns_add_sock(struct ns_mgr *s, sock_t sock, ns_callback_t callback, void *user_data) { struct ns_connection *conn; if ((conn = (struct ns_connection *) NS_MALLOC(sizeof(*conn))) != NULL) { memset(conn, 0, sizeof(*conn)); ns_set_non_blocking_mode(sock); ns_set_close_on_exec(sock); conn->sock = sock; conn->user_data = user_data; conn->callback = callback; conn->mgr = s; conn->last_io_time = time(NULL); ns_add_conn(s, conn); DBG(("%p %d", conn, sock)); } return conn; } struct ns_connection *ns_next(struct ns_mgr *s, struct ns_connection *conn) { return conn == NULL ? s->active_connections : conn->next; } void ns_broadcast(struct ns_mgr *mgr, ns_callback_t cb,void *data, size_t len) { struct ctl_msg ctl_msg; if (mgr->ctl[0] != INVALID_SOCKET && data != NULL && len < sizeof(ctl_msg.message)) { ctl_msg.callback = cb; memcpy(ctl_msg.message, data, len); send(mgr->ctl[0], (char *) &ctl_msg, offsetof(struct ctl_msg, message) + len, 0); recv(mgr->ctl[0], (char *) &len, 1, 0); } } void ns_mgr_init(struct ns_mgr *s, void *user_data) { memset(s, 0, sizeof(*s)); s->ctl[0] = s->ctl[1] = INVALID_SOCKET; s->user_data = user_data; #ifdef _WIN32 { WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); } #else // Ignore SIGPIPE signal, so if client cancels the request, it // won't kill the whole process. signal(SIGPIPE, SIG_IGN); #endif #ifndef NS_DISABLE_SOCKETPAIR do { ns_socketpair2(s->ctl, SOCK_DGRAM); } while (s->ctl[0] == INVALID_SOCKET); #endif #ifdef NS_ENABLE_SSL {static int init_done; if (!init_done) { SSL_library_init(); init_done++; }} #endif } void ns_mgr_free(struct ns_mgr *s) { struct ns_connection *conn, *tmp_conn; DBG(("%p", s)); if (s == NULL) return; // Do one last poll, see https://github.com/cesanta/mongoose/issues/286 ns_mgr_poll(s, 0); if (s->ctl[0] != INVALID_SOCKET) closesocket(s->ctl[0]); if (s->ctl[1] != INVALID_SOCKET) closesocket(s->ctl[1]); s->ctl[0] = s->ctl[1] = INVALID_SOCKET; for (conn = s->active_connections; conn != NULL; conn = tmp_conn) { tmp_conn = conn->next; ns_close_conn(conn); } } // net_skeleton end #endif // NOEMBED_NET_SKELETON #include #ifdef _WIN32 //////////////// Windows specific defines and includes #include // For _lseeki64 #include // For _mkdir #ifndef S_ISDIR #define S_ISDIR(x) ((x) & _S_IFDIR) #endif #ifdef stat #undef stat #endif #ifdef lseek #undef lseek #endif #ifdef popen #undef popen #endif #ifdef pclose #undef pclose #endif #define stat(x, y) mg_stat((x), (y)) #define fopen(x, y) mg_fopen((x), (y)) #define open(x, y, z) mg_open((x), (y), (z)) #define close(x) _close(x) #define fileno(x) _fileno(x) #define lseek(x, y, z) _lseeki64((x), (y), (z)) #define read(x, y, z) _read((x), (y), (z)) #define write(x, y, z) _write((x), (y), (z)) #define popen(x, y) _popen((x), (y)) #define pclose(x) _pclose(x) #define mkdir(x, y) _mkdir(x) #define rmdir(x) _rmdir(x) #define strdup(x) _strdup(x) #ifndef __func__ #define STRX(x) #x #define STR(x) STRX(x) #define __func__ __FILE__ ":" STR(__LINE__) #endif #define INT64_FMT "I64d" #define flockfile(x) ((void) (x)) #define funlockfile(x) ((void) (x)) typedef struct _stati64 file_stat_t; typedef HANDLE process_id_t; #else ////////////// UNIX specific defines and includes #if !defined(MONGOOSE_NO_FILESYSTEM) &&\ (!defined(MONGOOSE_NO_DAV) || !defined(MONGOOSE_NO_DIRECTORY_LISTING)) #include #endif #if !defined(MONGOOSE_NO_FILESYSTEM) && !defined(MONGOOSE_NO_DL) #include #endif #include #include #if !defined(O_BINARY) #define O_BINARY 0 #endif #define INT64_FMT PRId64 typedef struct stat file_stat_t; typedef pid_t process_id_t; #endif //////// End of platform-specific defines and includes #include "mongoose.h" #define MAX_REQUEST_SIZE 16384 #define IOBUF_SIZE 8192 #define MAX_PATH_SIZE 8192 #define DEFAULT_CGI_PATTERN "**.cgi$|**.pl$|**.php$" #define CGI_ENVIRONMENT_SIZE 8192 #define MAX_CGI_ENVIR_VARS 64 #define ENV_EXPORT_TO_CGI "MONGOOSE_CGI" #define PASSWORDS_FILE_NAME ".htpasswd" #ifndef MONGOOSE_USE_WEBSOCKET_PING_INTERVAL #define MONGOOSE_USE_WEBSOCKET_PING_INTERVAL 5 #endif // Extra HTTP headers to send in every static file reply #if !defined(MONGOOSE_USE_EXTRA_HTTP_HEADERS) #define MONGOOSE_USE_EXTRA_HTTP_HEADERS "" #endif #ifndef MONGOOSE_POST_SIZE_LIMIT #define MONGOOSE_POST_SIZE_LIMIT 0 #endif #ifndef MONGOOSE_IDLE_TIMEOUT_SECONDS #define MONGOOSE_IDLE_TIMEOUT_SECONDS 300 #endif #if defined(NS_DISABLE_SOCKETPAIR) && !defined(MONGOOSE_NO_CGI) #define MONGOOSE_NO_CGI #endif #ifdef MONGOOSE_NO_FILESYSTEM #define MONGOOSE_NO_AUTH #if !defined(MONGOOSE_NO_CGI) #define MONGOOSE_NO_CGI #endif #define MONGOOSE_NO_DAV #define MONGOOSE_NO_DIRECTORY_LISTING #define MONGOOSE_NO_LOGGING #define MONGOOSE_NO_SSI #define MONGOOSE_NO_DL #endif struct vec { const char *ptr; size_t len; }; // For directory listing and WevDAV support struct dir_entry { struct connection *conn; char *file_name; file_stat_t st; }; // NOTE(lsm): this enum shoulds be in sync with the config_options. enum { ACCESS_CONTROL_LIST, #ifndef MONGOOSE_NO_FILESYSTEM ACCESS_LOG_FILE, #ifndef MONGOOSE_NO_AUTH AUTH_DOMAIN, #endif #ifndef MONGOOSE_NO_CGI CGI_INTERPRETER, CGI_PATTERN, #endif DAV_AUTH_FILE, DAV_ROOT, DOCUMENT_ROOT, #ifndef MONGOOSE_NO_DIRECTORY_LISTING ENABLE_DIRECTORY_LISTING, #endif #endif ENABLE_PROXY, EXTRA_MIME_TYPES, #if !defined(MONGOOSE_NO_FILESYSTEM) && !defined(MONGOOSE_NO_AUTH) GLOBAL_AUTH_FILE, #endif #ifndef MONGOOSE_NO_FILESYSTEM HIDE_FILES_PATTERN, HEXDUMP_FILE, INDEX_FILES, #endif LISTENING_PORT, #ifndef _WIN32 RUN_AS_USER, #endif #ifndef MONGOOSE_NO_SSI SSI_PATTERN, #endif URL_REWRITES, NUM_OPTIONS }; static const char *static_config_options[] = { "access_control_list", NULL, #ifndef MONGOOSE_NO_FILESYSTEM "access_log_file", NULL, #ifndef MONGOOSE_NO_AUTH "auth_domain", "mydomain.com", #endif #ifndef MONGOOSE_NO_CGI "cgi_interpreter", NULL, "cgi_pattern", DEFAULT_CGI_PATTERN, #endif "dav_auth_file", NULL, "dav_root", NULL, "document_root", NULL, #ifndef MONGOOSE_NO_DIRECTORY_LISTING "enable_directory_listing", "yes", #endif #endif "enable_proxy", NULL, "extra_mime_types", NULL, #if !defined(MONGOOSE_NO_FILESYSTEM) && !defined(MONGOOSE_NO_AUTH) "global_auth_file", NULL, #endif #ifndef MONGOOSE_NO_FILESYSTEM "hide_files_patterns", NULL, "hexdump_file", NULL, "index_files","index.html,index.htm,index.shtml,index.cgi,index.php", #endif "listening_port", NULL, #ifndef _WIN32 "run_as_user", NULL, #endif #ifndef MONGOOSE_NO_SSI "ssi_pattern", "**.shtml$|**.shtm$", #endif "url_rewrites", NULL, NULL }; struct mg_server { struct ns_mgr ns_mgr; union socket_address lsa; // Listening socket address mg_handler_t event_handler; char *config_options[NUM_OPTIONS]; }; // Local endpoint representation union endpoint { int fd; // Opened regular local file struct ns_connection *nc; // CGI or proxy->target connection }; enum endpoint_type { EP_NONE, EP_FILE, EP_CGI, EP_USER, EP_PUT, EP_CLIENT, EP_PROXY }; #define MG_HEADERS_SENT NSF_USER_1 #define MG_USING_CHUNKED_API NSF_USER_2 #define MG_CGI_CONN NSF_USER_3 #define MG_PROXY_CONN NSF_USER_4 #define MG_PROXY_DONT_PARSE NSF_USER_5 struct connection { struct ns_connection *ns_conn; // NOTE(lsm): main.c depends on this order struct mg_connection mg_conn; struct mg_server *server; union endpoint endpoint; enum endpoint_type endpoint_type; char *path_info; char *request; int64_t num_bytes_recv; // Total number of bytes received int64_t cl; // Reply content length, for Range support ssize_t request_len; // Request length, including last \r\n after last header }; #define MG_CONN_2_CONN(c) ((struct connection *) ((char *) (c) - \ offsetof(struct connection, mg_conn))) static void open_local_endpoint(struct connection *conn, int skip_user); static void close_local_endpoint(struct connection *conn); static void mg_ev_handler(struct ns_connection *nc, int ev, void *p); static const struct { const char *extension; size_t ext_len; const char *mime_type; } static_builtin_mime_types[] = { {".html", 5, "text/html"}, {".htm", 4, "text/html"}, {".shtm", 5, "text/html"}, {".shtml", 6, "text/html"}, {".css", 4, "text/css"}, {".js", 3, "application/javascript"}, {".ico", 4, "image/x-icon"}, {".gif", 4, "image/gif"}, {".jpg", 4, "image/jpeg"}, {".jpeg", 5, "image/jpeg"}, {".png", 4, "image/png"}, {".svg", 4, "image/svg+xml"}, {".txt", 4, "text/plain"}, {".torrent", 8, "application/x-bittorrent"}, {".wav", 4, "audio/x-wav"}, {".mp3", 4, "audio/x-mp3"}, {".mid", 4, "audio/mid"}, {".m3u", 4, "audio/x-mpegurl"}, {".ogg", 4, "application/ogg"}, {".ram", 4, "audio/x-pn-realaudio"}, {".xml", 4, "text/xml"}, {".json", 5, "application/json"}, {".xslt", 5, "application/xml"}, {".xsl", 4, "application/xml"}, {".ra", 3, "audio/x-pn-realaudio"}, {".doc", 4, "application/msword"}, {".exe", 4, "application/octet-stream"}, {".zip", 4, "application/x-zip-compressed"}, {".xls", 4, "application/excel"}, {".tgz", 4, "application/x-tar-gz"}, {".tar", 4, "application/x-tar"}, {".gz", 3, "application/x-gunzip"}, {".arj", 4, "application/x-arj-compressed"}, {".rar", 4, "application/x-rar-compressed"}, {".rtf", 4, "application/rtf"}, {".pdf", 4, "application/pdf"}, {".swf", 4, "application/x-shockwave-flash"}, {".mpg", 4, "video/mpeg"}, {".webm", 5, "video/webm"}, {".mpeg", 5, "video/mpeg"}, {".mov", 4, "video/quicktime"}, {".mp4", 4, "video/mp4"}, {".m4v", 4, "video/x-m4v"}, {".asf", 4, "video/x-ms-asf"}, {".avi", 4, "video/x-msvideo"}, {".bmp", 4, "image/bmp"}, {".ttf", 4, "application/x-font-ttf"}, {NULL, 0, NULL} }; #ifdef MONGOOSE_ENABLE_THREADS void *mg_start_thread(void *(*f)(void *), void *p) { return ns_start_thread(f, p); } #endif // MONGOOSE_ENABLE_THREADS #ifndef MONGOOSE_NO_MMAP #ifdef _WIN32 static void *mmap(void *addr, int64_t len, int prot, int flags, int fd, int offset) { HANDLE fh = (HANDLE) _get_osfhandle(fd); HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0); void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len); CloseHandle(mh); return p; } #define munmap(x, y) UnmapViewOfFile(x) #define MAP_FAILED NULL #define MAP_PRIVATE 0 #define PROT_READ 0 #elif defined(__OS2__) static void *mmap(void *addr, int64_t len, int prot, int flags, int fd, int offset) { void *p; int pos = lseek( fd, 0, SEEK_CUR ); /* Get a current position */ if (pos == -1) return NULL; /* Seek to offset offset */ if (lseek( fd, offset, SEEK_SET) == -1) return NULL; p = malloc(len); /* Read in a file */ if (!p || read(fd, p, len) == -1) { free(p); p = NULL; } /* Restore the position */ lseek(fd, pos, SEEK_SET); return p; } #define munmap(x, y) free(x) #define MAP_FAILED NULL #define MAP_PRIVATE 0 #define PROT_READ 0 #else #include #endif void *mg_mmap(FILE *fp, size_t size) { void *p = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fileno(fp), 0); return p == MAP_FAILED ? NULL : p; } void mg_munmap(void *p, size_t size) { munmap(p, size); } #endif // MONGOOSE_NO_MMAP #if defined(_WIN32) && !defined(MONGOOSE_NO_FILESYSTEM) // Encode 'path' which is assumed UTF-8 string, into UNICODE string. // wbuf and wbuf_len is a target buffer and its length. static void to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) { char buf[MAX_PATH_SIZE * 2], buf2[MAX_PATH_SIZE * 2], *p; strncpy(buf, path, sizeof(buf)); buf[sizeof(buf) - 1] = '\0'; // Trim trailing slashes. Leave backslash for paths like "X:\" p = buf + strlen(buf) - 1; while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0'; // Convert to Unicode and back. If doubly-converted string does not // match the original, something is fishy, reject. memset(wbuf, 0, wbuf_len * sizeof(wchar_t)); MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2), NULL, NULL); if (strcmp(buf, buf2) != 0) { wbuf[0] = L'\0'; } } static int mg_stat(const char *path, file_stat_t *st) { wchar_t wpath[MAX_PATH_SIZE]; to_wchar(path, wpath, ARRAY_SIZE(wpath)); DBG(("[%ls] -> %d", wpath, _wstati64(wpath, st))); return _wstati64(wpath, st); } static FILE *mg_fopen(const char *path, const char *mode) { wchar_t wpath[MAX_PATH_SIZE], wmode[10]; to_wchar(path, wpath, ARRAY_SIZE(wpath)); to_wchar(mode, wmode, ARRAY_SIZE(wmode)); return _wfopen(wpath, wmode); } static int mg_open(const char *path, int flag, int mode) { wchar_t wpath[MAX_PATH_SIZE]; to_wchar(path, wpath, ARRAY_SIZE(wpath)); return _wopen(wpath, flag, mode); } #endif // _WIN32 && !MONGOOSE_NO_FILESYSTEM // A helper function for traversing a comma separated list of values. // It returns a list pointer shifted to the next value, or NULL if the end // of the list found. // Value is stored in val vector. If value has form "x=y", then eq_val // vector is initialized to point to the "y" part, and val vector length // is adjusted to point only to "x". static const char *next_option(const char *list, struct vec *val, struct vec *eq_val) { if (list == NULL || *list == '\0') { // End of the list list = NULL; } else { val->ptr = list; if ((list = strchr(val->ptr, ',')) != NULL) { // Comma found. Store length and shift the list ptr val->len = list - val->ptr; list++; } else { // This value is the last one list = val->ptr + strlen(val->ptr); val->len = list - val->ptr; } if (eq_val != NULL) { // Value has form "x=y", adjust pointers and lengths // so that val points to "x", and eq_val points to "y". eq_val->len = 0; eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len); if (eq_val->ptr != NULL) { eq_val->ptr++; // Skip over '=' character eq_val->len = val->ptr + val->len - eq_val->ptr; val->len = (eq_val->ptr - val->ptr) - 1; } } } return list; } // Like snprintf(), but never returns negative value, or a value // that is larger than a supplied buffer. static int mg_vsnprintf(char *buf, size_t buflen, const char *fmt, va_list ap) { int n; if (buflen < 1) return 0; n = vsnprintf(buf, buflen, fmt, ap); if (n < 0) { n = 0; } else if (n >= (int) buflen) { n = (int) buflen - 1; } buf[n] = '\0'; return n; } static int mg_snprintf(char *buf, size_t buflen, const char *fmt, ...) { va_list ap; int n; va_start(ap, fmt); n = mg_vsnprintf(buf, buflen, fmt, ap); va_end(ap); return n; } // Check whether full request is buffered. Return: // -1 if request is malformed // 0 if request is not yet fully buffered // >0 actual request length, including last \r\n\r\n static int get_request_len(const char *s, size_t buf_len) { const unsigned char *buf = (unsigned char *) s; size_t i; for (i = 0; i < buf_len; i++) { // Control characters are not allowed but >=128 are. // Abort scan as soon as one malformed character is found. if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) { return -1; } else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') { return i + 2; } else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' && buf[i + 2] == '\n') { return i + 3; } } return 0; } // Skip the characters until one of the delimiters characters found. // 0-terminate resulting word. Skip the rest of the delimiters if any. // Advance pointer to buffer to the next word. Return found 0-terminated word. static char *skip(char **buf, const char *delimiters) { char *p, *begin_word, *end_word, *end_delimiters; begin_word = *buf; end_word = begin_word + strcspn(begin_word, delimiters); end_delimiters = end_word + strspn(end_word, delimiters); for (p = end_word; p < end_delimiters; p++) { *p = '\0'; } *buf = end_delimiters; return begin_word; } // Parse HTTP headers from the given buffer, advance buffer to the point // where parsing stopped. static void parse_http_headers(char **buf, struct mg_connection *ri) { size_t i; for (i = 0; i < ARRAY_SIZE(ri->http_headers); i++) { ri->http_headers[i].name = skip(buf, ": "); ri->http_headers[i].value = skip(buf, "\r\n"); if (ri->http_headers[i].name[0] == '\0') break; ri->num_headers = i + 1; } } static const char *status_code_to_str(int status_code) { switch (status_code) { case 100: return "Continue"; case 101: return "Switching Protocols"; case 102: return "Processing"; case 200: return "OK"; case 201: return "Created"; case 202: return "Accepted"; case 203: return "Non-Authoritative Information"; case 204: return "No Content"; case 205: return "Reset Content"; case 206: return "Partial Content"; case 207: return "Multi-Status"; case 208: return "Already Reported"; case 226: return "IM Used"; case 300: return "Multiple Choices"; case 301: return "Moved Permanently"; case 302: return "Found"; case 303: return "See Other"; case 304: return "Not Modified"; case 305: return "Use Proxy"; case 306: return "Switch Proxy"; case 307: return "Temporary Redirect"; case 308: return "Permanent Redirect"; case 400: return "Bad Request"; case 401: return "Unauthorized"; case 402: return "Payment Required"; case 403: return "Forbidden"; case 404: return "Not Found"; case 405: return "Method Not Allowed"; case 406: return "Not Acceptable"; case 407: return "Proxy Authentication Required"; case 408: return "Request Timeout"; case 409: return "Conflict"; case 410: return "Gone"; case 411: return "Length Required"; case 412: return "Precondition Failed"; case 413: return "Payload Too Large"; case 414: return "URI Too Long"; case 415: return "Unsupported Media Type"; case 416: return "Requested Range Not Satisfiable"; case 417: return "Expectation Failed"; case 418: return "I\'m a teapot"; case 422: return "Unprocessable Entity"; case 423: return "Locked"; case 424: return "Failed Dependency"; case 426: return "Upgrade Required"; case 428: return "Precondition Required"; case 429: return "Too Many Requests"; case 431: return "Request Header Fields Too Large"; case 451: return "Unavailable For Legal Reasons"; case 500: return "Internal Server Error"; case 501: return "Not Implemented"; case 502: return "Bad Gateway"; case 503: return "Service Unavailable"; case 504: return "Gateway Timeout"; case 505: return "HTTP Version Not Supported"; case 506: return "Variant Also Negotiates"; case 507: return "Insufficient Storage"; case 508: return "Loop Detected"; case 510: return "Not Extended"; case 511: return "Network Authentication Required"; default: return "Server Error"; } } static int call_user(struct connection *conn, enum mg_event ev) { return conn != NULL && conn->server != NULL && conn->server->event_handler != NULL ? conn->server->event_handler(&conn->mg_conn, ev) : MG_FALSE; } static void send_http_error(struct connection *conn, int code, const char *fmt, ...) { const char *message = status_code_to_str(code); const char *rewrites = conn->server->config_options[URL_REWRITES]; char headers[200], body[200]; struct vec a, b; va_list ap; int body_len, headers_len, match_code; conn->mg_conn.status_code = code; // Invoke error handler if it is set if (call_user(conn, MG_HTTP_ERROR) == MG_TRUE) { close_local_endpoint(conn); return; } // Handle error code rewrites while ((rewrites = next_option(rewrites, &a, &b)) != NULL) { if ((match_code = atoi(a.ptr)) > 0 && match_code == code) { struct mg_connection *c = &conn->mg_conn; c->status_code = 302; mg_printf(c, "HTTP/1.1 %d Moved\r\n" "Location: %.*s?code=%d&orig_uri=%s&query_string=%s\r\n\r\n", c->status_code, b.len, b.ptr, code, c->uri, c->query_string == NULL ? "" : c->query_string); close_local_endpoint(conn); return; } } body_len = mg_snprintf(body, sizeof(body), "%d %s\n", code, message); if (fmt != NULL) { va_start(ap, fmt); body_len += mg_vsnprintf(body + body_len, sizeof(body) - body_len, fmt, ap); va_end(ap); } if ((code >= 300 && code <= 399) || code == 204) { // 3xx errors do not have body body_len = 0; } headers_len = mg_snprintf(headers, sizeof(headers), "HTTP/1.1 %d %s\r\nContent-Length: %d\r\n" "Content-Type: text/plain\r\n\r\n", code, message, body_len); ns_send(conn->ns_conn, headers, headers_len); ns_send(conn->ns_conn, body, body_len); close_local_endpoint(conn); // This will write to the log file } static void write_chunk(struct connection *conn, const char *buf, int len) { char chunk_size[50]; int n = mg_snprintf(chunk_size, sizeof(chunk_size), "%X\r\n", len); ns_send(conn->ns_conn, chunk_size, n); ns_send(conn->ns_conn, buf, len); ns_send(conn->ns_conn, "\r\n", 2); } size_t mg_printf(struct mg_connection *conn, const char *fmt, ...) { struct connection *c = MG_CONN_2_CONN(conn); va_list ap; va_start(ap, fmt); ns_vprintf(c->ns_conn, fmt, ap); va_end(ap); return c->ns_conn->send_iobuf.len; } static void ns_forward(struct ns_connection *from, struct ns_connection *to) { DBG(("%p -> %p %lu bytes", from, to, (unsigned long)from->recv_iobuf.len)); ns_send(to, from->recv_iobuf.buf, from->recv_iobuf.len); iobuf_remove(&from->recv_iobuf, from->recv_iobuf.len); } #ifndef MONGOOSE_NO_CGI #ifdef _WIN32 struct threadparam { sock_t s; HANDLE hPipe; }; static int wait_until_ready(sock_t sock, int for_read) { fd_set set; FD_ZERO(&set); FD_SET(sock, &set); select(sock + 1, for_read ? &set : 0, for_read ? 0 : &set, 0, 0); return 1; } static void *push_to_stdin(void *arg) { struct threadparam *tp = (struct threadparam *)arg; int n, sent, stop = 0; DWORD k; char buf[IOBUF_SIZE]; while (!stop && wait_until_ready(tp->s, 1) && (n = recv(tp->s, buf, sizeof(buf), 0)) > 0) { if (n == -1 && GetLastError() == WSAEWOULDBLOCK) continue; for (sent = 0; !stop && sent < n; sent += k) { if (!WriteFile(tp->hPipe, buf + sent, n - sent, &k, 0)) stop = 1; } } DBG(("%s", "FORWARED EVERYTHING TO CGI")); CloseHandle(tp->hPipe); NS_FREE(tp); _endthread(); return NULL; } static void *pull_from_stdout(void *arg) { struct threadparam *tp = (struct threadparam *)arg; int k = 0, stop = 0; DWORD n, sent; char buf[IOBUF_SIZE]; while (!stop && ReadFile(tp->hPipe, buf, sizeof(buf), &n, NULL)) { for (sent = 0; !stop && sent < n; sent += k) { if (wait_until_ready(tp->s, 0) && (k = send(tp->s, buf + sent, n - sent, 0)) <= 0) stop = 1; } } DBG(("%s", "EOF FROM CGI")); CloseHandle(tp->hPipe); shutdown(tp->s, 2); // Without this, IO thread may get truncated data closesocket(tp->s); NS_FREE(tp); _endthread(); return NULL; } static void spawn_stdio_thread(sock_t sock, HANDLE hPipe, void *(*func)(void *)) { struct threadparam *tp = (struct threadparam *)NS_MALLOC(sizeof(*tp)); if (tp != NULL) { tp->s = sock; tp->hPipe = hPipe; mg_start_thread(func, tp); } } static void abs_path(const char *utf8_path, char *abs_path, size_t len) { wchar_t buf[MAX_PATH_SIZE], buf2[MAX_PATH_SIZE]; to_wchar(utf8_path, buf, ARRAY_SIZE(buf)); GetFullPathNameW(buf, ARRAY_SIZE(buf2), buf2, NULL); WideCharToMultiByte(CP_UTF8, 0, buf2, wcslen(buf2) + 1, abs_path, len, 0, 0); } static process_id_t start_process(char *interp, const char *cmd, const char *env, const char *envp[], const char *dir, sock_t sock) { STARTUPINFOW si; PROCESS_INFORMATION pi; HANDLE a[2], b[2], me = GetCurrentProcess(); wchar_t wcmd[MAX_PATH_SIZE], full_dir[MAX_PATH_SIZE]; char buf[MAX_PATH_SIZE], buf4[MAX_PATH_SIZE], buf5[MAX_PATH_SIZE], cmdline[MAX_PATH_SIZE], *p; DWORD flags = DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS; FILE *fp; memset(&si, 0, sizeof(si)); memset(&pi, 0, sizeof(pi)); si.cb = sizeof(si); si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; si.wShowWindow = SW_HIDE; si.hStdError = GetStdHandle(STD_ERROR_HANDLE); CreatePipe(&a[0], &a[1], NULL, 0); CreatePipe(&b[0], &b[1], NULL, 0); DuplicateHandle(me, a[0], me, &si.hStdInput, 0, TRUE, flags); DuplicateHandle(me, b[1], me, &si.hStdOutput, 0, TRUE, flags); if (interp == NULL && (fp = fopen(cmd, "r")) != NULL) { buf[0] = buf[1] = '\0'; fgets(buf, sizeof(buf), fp); buf[sizeof(buf) - 1] = '\0'; if (buf[0] == '#' && buf[1] == '!') { interp = buf + 2; for (p = interp + strlen(interp) - 1; isspace(* (uint8_t *) p) && p > interp; p--) *p = '\0'; } fclose(fp); } if (interp != NULL) { abs_path(interp, buf4, ARRAY_SIZE(buf4)); interp = buf4; } abs_path(dir, buf5, ARRAY_SIZE(buf5)); to_wchar(dir, full_dir, ARRAY_SIZE(full_dir)); mg_snprintf(cmdline, sizeof(cmdline), "%s%s\"%s\"", interp ? interp : "", interp ? " " : "", cmd); to_wchar(cmdline, wcmd, ARRAY_SIZE(wcmd)); if (CreateProcessW(NULL, wcmd, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP, (void *) env, full_dir, &si, &pi) != 0) { spawn_stdio_thread(sock, a[1], push_to_stdin); spawn_stdio_thread(sock, b[0], pull_from_stdout); } else { CloseHandle(a[1]); CloseHandle(b[0]); closesocket(sock); } DBG(("CGI command: [%ls] -> %p", wcmd, pi.hProcess)); // Not closing a[0] and b[1] because we've used DUPLICATE_CLOSE_SOURCE CloseHandle(si.hStdOutput); CloseHandle(si.hStdInput); //CloseHandle(pi.hThread); //CloseHandle(pi.hProcess); return pi.hProcess; } #else static process_id_t start_process(const char *interp, const char *cmd, const char *env, const char *envp[], const char *dir, sock_t sock) { char buf[500]; process_id_t pid = fork(); (void) env; if (pid == 0) { (void) chdir(dir); (void) dup2(sock, 0); (void) dup2(sock, 1); closesocket(sock); // After exec, all signal handlers are restored to their default values, // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's // implementation, SIGCHLD's handler will leave unchanged after exec // if it was set to be ignored. Restore it to default action. signal(SIGCHLD, SIG_DFL); if (interp == NULL) { execle(cmd, cmd, (char *) 0, envp); // Using (char *) 0 to avoid warning } else { execle(interp, interp, cmd, (char *) 0, envp); } snprintf(buf, sizeof(buf), "Status: 500\r\n\r\n" "500 Server Error: %s%s%s: %s", interp == NULL ? "" : interp, interp == NULL ? "" : " ", cmd, strerror(errno)); send(1, buf, strlen(buf), 0); exit(EXIT_FAILURE); // exec call failed } return pid; } #endif // _WIN32 // This structure helps to create an environment for the spawned CGI program. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings, // last element must be NULL. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0 // strings must reside in a contiguous buffer. The end of the buffer is // marked by two '\0' characters. // We satisfy both worlds: we create an envp array (which is vars), all // entries are actually pointers inside buf. struct cgi_env_block { struct mg_connection *conn; char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer const char *vars[MAX_CGI_ENVIR_VARS]; // char *envp[] int len; // Space taken int nvars; // Number of variables in envp[] }; // Append VARIABLE=VALUE\0 string to the buffer, and add a respective // pointer into the vars array. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) { int n, space; char *added; va_list ap; // Calculate how much space is left in the buffer space = sizeof(block->buf) - block->len - 2; assert(space >= 0); // Make a pointer to the free space int the buffer added = block->buf + block->len; // Copy VARIABLE=VALUE\0 string into the free space va_start(ap, fmt); n = mg_vsnprintf(added, (size_t) space, fmt, ap); va_end(ap); // Make sure we do not overflow buffer and the envp array if (n > 0 && n + 1 < space && block->nvars < (int) ARRAY_SIZE(block->vars) - 2) { // Append a pointer to the added string into the envp array block->vars[block->nvars++] = added; // Bump up used length counter. Include \0 terminator block->len += n + 1; } return added; } static void addenv2(struct cgi_env_block *blk, const char *name) { const char *s; if ((s = getenv(name)) != NULL) addenv(blk, "%s=%s", name, s); } static void prepare_cgi_environment(struct connection *conn, const char *prog, struct cgi_env_block *blk) { struct mg_connection *ri = &conn->mg_conn; const char *s, *slash; char *p, **opts = conn->server->config_options; int i; blk->len = blk->nvars = 0; blk->conn = ri; if ((s = getenv("SERVER_NAME")) != NULL) { addenv(blk, "SERVER_NAME=%s", s); } else { addenv(blk, "SERVER_NAME=%s", ri->local_ip); } addenv(blk, "SERVER_ROOT=%s", opts[DOCUMENT_ROOT]); addenv(blk, "DOCUMENT_ROOT=%s", opts[DOCUMENT_ROOT]); addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", MONGOOSE_VERSION); // Prepare the environment block addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1"); addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1"); addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP // TODO(lsm): fix this for IPv6 case //addenv(blk, "SERVER_PORT=%d", ri->remote_port); addenv(blk, "REQUEST_METHOD=%s", ri->request_method); addenv(blk, "REMOTE_ADDR=%s", ri->remote_ip); addenv(blk, "REMOTE_PORT=%d", ri->remote_port); addenv(blk, "REQUEST_URI=%s%s%s", ri->uri, ri->query_string == NULL ? "" : "?", ri->query_string == NULL ? "" : ri->query_string); // SCRIPT_NAME if (conn->path_info != NULL) { addenv(blk, "SCRIPT_NAME=%.*s", (int) (strlen(ri->uri) - strlen(conn->path_info)), ri->uri); addenv(blk, "PATH_INFO=%s", conn->path_info); } else { s = strrchr(prog, '/'); slash = strrchr(ri->uri, '/'); addenv(blk, "SCRIPT_NAME=%.*s%s", slash == NULL ? 0 : (int) (slash - ri->uri), ri->uri, s == NULL ? prog : s); } addenv(blk, "SCRIPT_FILENAME=%s", prog); addenv(blk, "PATH_TRANSLATED=%s", prog); addenv(blk, "HTTPS=%s", conn->ns_conn->ssl != NULL ? "on" : "off"); if ((s = mg_get_header(ri, "Content-Type")) != NULL) addenv(blk, "CONTENT_TYPE=%s", s); if (ri->query_string != NULL) addenv(blk, "QUERY_STRING=%s", ri->query_string); if ((s = mg_get_header(ri, "Content-Length")) != NULL) addenv(blk, "CONTENT_LENGTH=%s", s); addenv2(blk, "PATH"); addenv2(blk, "TMP"); addenv2(blk, "TEMP"); addenv2(blk, "TMPDIR"); addenv2(blk, "PERLLIB"); addenv2(blk, ENV_EXPORT_TO_CGI); #if defined(_WIN32) addenv2(blk, "COMSPEC"); addenv2(blk, "SYSTEMROOT"); addenv2(blk, "SystemDrive"); addenv2(blk, "ProgramFiles"); addenv2(blk, "ProgramFiles(x86)"); addenv2(blk, "CommonProgramFiles(x86)"); #else addenv2(blk, "LD_LIBRARY_PATH"); #endif // _WIN32 // Add all headers as HTTP_* variables for (i = 0; i < ri->num_headers; i++) { p = addenv(blk, "HTTP_%s=%s", ri->http_headers[i].name, ri->http_headers[i].value); // Convert variable name into uppercase, and change - to _ for (; *p != '=' && *p != '\0'; p++) { if (*p == '-') *p = '_'; *p = (char) toupper(* (unsigned char *) p); } } blk->vars[blk->nvars++] = NULL; blk->buf[blk->len++] = '\0'; assert(blk->nvars < (int) ARRAY_SIZE(blk->vars)); assert(blk->len > 0); assert(blk->len < (int) sizeof(blk->buf)); } static const char cgi_status[] = "HTTP/1.1 200 OK\r\n"; static void open_cgi_endpoint(struct connection *conn, const char *prog) { struct cgi_env_block blk; char dir[MAX_PATH_SIZE]; const char *p; sock_t fds[2]; prepare_cgi_environment(conn, prog, &blk); // CGI must be executed in its own directory. 'dir' must point to the // directory containing executable program, 'p' must point to the // executable program name relative to 'dir'. if ((p = strrchr(prog, '/')) == NULL) { mg_snprintf(dir, sizeof(dir), "%s", "."); } else { mg_snprintf(dir, sizeof(dir), "%.*s", (int) (p - prog), prog); } // Try to create socketpair in a loop until success. ns_socketpair() // can be interrupted by a signal and fail. // TODO(lsm): use sigaction to restart interrupted syscall do { ns_socketpair(fds); } while (fds[0] == INVALID_SOCKET); if (start_process(conn->server->config_options[CGI_INTERPRETER], prog, blk.buf, blk.vars, dir, fds[1]) != 0) { conn->endpoint_type = EP_CGI; conn->endpoint.nc = ns_add_sock(&conn->server->ns_mgr, fds[0], mg_ev_handler, conn); conn->endpoint.nc->flags |= MG_CGI_CONN; ns_send(conn->ns_conn, cgi_status, sizeof(cgi_status) - 1); conn->mg_conn.status_code = 200; conn->ns_conn->flags |= NSF_BUFFER_BUT_DONT_SEND; // Pass POST data to the CGI process conn->endpoint.nc->send_iobuf = conn->ns_conn->recv_iobuf; iobuf_init(&conn->ns_conn->recv_iobuf, 0); } else { closesocket(fds[0]); send_http_error(conn, 500, "start_process(%s) failed", prog); } #ifndef _WIN32 closesocket(fds[1]); // On Windows, CGI stdio thread closes that socket #endif } static void on_cgi_data(struct ns_connection *nc) { struct connection *conn = (struct connection *) nc->user_data; const char *status = "500"; struct mg_connection c; if (!conn) return; // Copy CGI data from CGI socket to the client send buffer ns_forward(nc, conn->ns_conn); // If reply has not been parsed yet, parse it if (conn->ns_conn->flags & NSF_BUFFER_BUT_DONT_SEND) { struct iobuf *io = &conn->ns_conn->send_iobuf; size_t s_len = sizeof(cgi_status) - 1; int len = get_request_len(io->buf + s_len, io->len - s_len); char buf[MAX_REQUEST_SIZE], *s = buf; if (len == 0) return; if (len < 0 || len > (int) sizeof(buf)) { len = io->len; iobuf_remove(io, io->len); send_http_error(conn, 500, "CGI program sent malformed headers: [%.*s]", len, io->buf); } else { memset(&c, 0, sizeof(c)); memcpy(buf, io->buf + s_len, len); buf[len - 1] = '\0'; parse_http_headers(&s, &c); if (mg_get_header(&c, "Location") != NULL) { status = "302"; } else if ((status = (char *) mg_get_header(&c, "Status")) == NULL) { status = "200"; } memcpy(io->buf + 9, status, 3); conn->mg_conn.status_code = atoi(status); } conn->ns_conn->flags &= ~NSF_BUFFER_BUT_DONT_SEND; } } #endif // !MONGOOSE_NO_CGI static char *mg_strdup(const char *str) { char *copy = (char *) NS_MALLOC(strlen(str) + 1); if (copy != NULL) { strcpy(copy, str); } return copy; } static int isbyte(int n) { return n >= 0 && n <= 255; } static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) { int n, a, b, c, d, slash = 32, len = 0; if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 || sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) && isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 && slash < 33) { len = n; *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d; *mask = slash ? 0xffffffffU << (32 - slash) : 0; } return len; } // Verify given socket address against the ACL. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed. static int check_acl(const char *acl, uint32_t remote_ip) { int allowed, flag; uint32_t net, mask; struct vec vec; // If any ACL is set, deny by default allowed = acl == NULL ? '+' : '-'; while ((acl = next_option(acl, &vec, NULL)) != NULL) { flag = vec.ptr[0]; if ((flag != '+' && flag != '-') || parse_net(&vec.ptr[1], &net, &mask) == 0) { return -1; } if (net == (remote_ip & mask)) { allowed = flag; } } return allowed == '+'; } // Protect against directory disclosure attack by removing '..', // excessive '/' and '\' characters static void remove_double_dots_and_double_slashes(char *s) { char *p = s; while (*s != '\0') { *p++ = *s++; if (s[-1] == '/' || s[-1] == '\\') { // Skip all following slashes, backslashes and double-dots while (s[0] != '\0') { if (s[0] == '/' || s[0] == '\\') { s++; } else if (s[0] == '.' && (s[1] == '/' || s[1] == '\\')) { s += 2; } else if (s[0] == '.' && s[1] == '.' && s[2] == '\0') { s += 2; } else if (s[0] == '.' && s[1] == '.' && (s[2] == '/' || s[2] == '\\')) { s += 3; } else { break; } } } } *p = '\0'; } int mg_url_decode(const char *src, size_t src_len, char *dst, size_t dst_len, int is_form_url_encoded) { size_t i, j = 0; int a, b; #define HEXTOI(x) (isdigit(x) ? (x) - '0' : (x) - 'W') for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) { if (src[i] == '%' && i + 2 < src_len && isxdigit(* (const unsigned char *) (src + i + 1)) && isxdigit(* (const unsigned char *) (src + i + 2))) { a = tolower(* (const unsigned char *) (src + i + 1)); b = tolower(* (const unsigned char *) (src + i + 2)); dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b)); i += 2; } else if (is_form_url_encoded && src[i] == '+') { dst[j] = ' '; } else { dst[j] = src[i]; } } dst[j] = '\0'; // Null-terminate the destination return i >= src_len ? j : -1; } static int is_valid_http_method(const char *s) { return !strcmp(s, "GET") || !strcmp(s, "POST") || !strcmp(s, "HEAD") || !strcmp(s, "CONNECT") || !strcmp(s, "PUT") || !strcmp(s, "DELETE") || !strcmp(s, "OPTIONS") || !strcmp(s, "PROPFIND") || !strcmp(s, "MKCOL"); } // Parse HTTP request, fill in mg_request structure. // This function modifies the buffer by NUL-terminating // HTTP request components, header names and header values. // Note that len must point to the last \n of HTTP headers. static size_t parse_http_message(char *buf, size_t len, struct mg_connection *ri) { int is_request, n; // Reset the connection. Make sure that we don't touch fields that are // set elsewhere: remote_ip, remote_port, server_param ri->request_method = ri->uri = ri->http_version = ri->query_string = NULL; ri->num_headers = ri->status_code = ri->is_websocket = ri->content_len = 0; if (len < 1) return ~0; buf[len - 1] = '\0'; // RFC says that all initial whitespaces should be ingored while (*buf != '\0' && isspace(* (unsigned char *) buf)) { buf++; } ri->request_method = skip(&buf, " "); ri->uri = skip(&buf, " "); ri->http_version = skip(&buf, "\r\n"); // HTTP message could be either HTTP request or HTTP response, e.g. // "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..." is_request = is_valid_http_method(ri->request_method); if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) || (!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) { len = ~0; } else { if (is_request) { ri->http_version += 5; } else { ri->status_code = atoi(ri->uri); } parse_http_headers(&buf, ri); if ((ri->query_string = strchr(ri->uri, '?')) != NULL) { *(char *) ri->query_string++ = '\0'; } n = (int) strlen(ri->uri); mg_url_decode(ri->uri, n, (char *) ri->uri, n + 1, 0); if (*ri->uri == '/' || *ri->uri == '.') { remove_double_dots_and_double_slashes((char *) ri->uri); } } return len; } static int lowercase(const char *s) { return tolower(* (const unsigned char *) s); } static int mg_strcasecmp(const char *s1, const char *s2) { int diff; do { diff = lowercase(s1++) - lowercase(s2++); } while (diff == 0 && s1[-1] != '\0'); return diff; } static int mg_strncasecmp(const char *s1, const char *s2, size_t len) { int diff = 0; if (len > 0) do { diff = lowercase(s1++) - lowercase(s2++); } while (diff == 0 && s1[-1] != '\0' && --len > 0); return diff; } // Return HTTP header value, or NULL if not found. const char *mg_get_header(const struct mg_connection *ri, const char *s) { int i; for (i = 0; i < ri->num_headers; i++) if (!mg_strcasecmp(s, ri->http_headers[i].name)) return ri->http_headers[i].value; return NULL; } // Perform case-insensitive match of string against pattern int mg_match_prefix(const char *pattern, ssize_t pattern_len, const char *str) { const char *or_str; int len, res, i = 0, j = 0; if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) { res = mg_match_prefix(pattern, or_str - pattern, str); return res > 0 ? res : mg_match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str); } for (; i < pattern_len; i++, j++) { if (pattern[i] == '?' && str[j] != '\0') { continue; } else if (pattern[i] == '$') { return str[j] == '\0' ? j : -1; } else if (pattern[i] == '*') { i++; if (pattern[i] == '*') { i++; len = (int) strlen(str + j); } else { len = (int) strcspn(str + j, "/"); } if (i == pattern_len) { return j + len; } do { res = mg_match_prefix(pattern + i, pattern_len - i, str + j + len); } while (res == -1 && len-- > 0); return res == -1 ? -1 : j + res + len; } else if (lowercase(&pattern[i]) != lowercase(&str[j])) { return -1; } } return j; } // This function prints HTML pages, and expands "{{something}}" blocks // inside HTML by calling appropriate callback functions. // Note that {{@path/to/file}} construct outputs embedded file's contents, // which provides SSI-like functionality. void mg_template(struct mg_connection *conn, const char *s, struct mg_expansion *expansions) { int i, j, pos = 0, inside_marker = 0; for (i = 0; s[i] != '\0'; i++) { if (inside_marker == 0 && !memcmp(&s[i], "{{", 2)) { if (i > pos) { mg_send_data(conn, &s[pos], i - pos); } pos = i; inside_marker = 1; } if (inside_marker == 1 && !memcmp(&s[i], "}}", 2)) { for (j = 0; expansions[j].keyword != NULL; j++) { const char *kw = expansions[j].keyword; if ((int) strlen(kw) == i - (pos + 2) && memcmp(kw, &s[pos + 2], i - (pos + 2)) == 0) { expansions[j].handler(conn); pos = i + 2; break; } } inside_marker = 0; } } if (i > pos) { mg_send_data(conn, &s[pos], i - pos); } } #ifndef MONGOOSE_NO_FILESYSTEM static int is_dav_request(const struct connection *conn) { const char *s = conn->mg_conn.request_method; return !strcmp(s, "PUT") || !strcmp(s, "DELETE") || !strcmp(s, "MKCOL") || !strcmp(s, "PROPFIND"); } static int must_hide_file(struct connection *conn, const char *path) { const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$"; const char *pattern = conn->server->config_options[HIDE_FILES_PATTERN]; return mg_match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 || (pattern != NULL && mg_match_prefix(pattern, strlen(pattern), path) > 0); } // Return 1 if real file has been found, 0 otherwise static int convert_uri_to_file_name(struct connection *conn, char *buf, size_t buf_len, file_stat_t *st) { struct vec a, b; const char *rewrites = conn->server->config_options[URL_REWRITES]; const char *root = #ifndef MONGOOSE_NO_DAV is_dav_request(conn) && conn->server->config_options[DAV_ROOT] != NULL ? conn->server->config_options[DAV_ROOT] : #endif conn->server->config_options[DOCUMENT_ROOT]; #ifndef MONGOOSE_NO_CGI const char *cgi_pat = conn->server->config_options[CGI_PATTERN]; char *p; #endif const char *uri = conn->mg_conn.uri; const char *domain = mg_get_header(&conn->mg_conn, "Host"); size_t match_len, root_len = root == NULL ? 0 : strlen(root); // Perform virtual hosting rewrites if (rewrites != NULL && domain != NULL) { const char *colon = strchr(domain, ':'); size_t domain_len = colon == NULL ? strlen(domain) : colon - domain; while ((rewrites = next_option(rewrites, &a, &b)) != NULL) { if (a.len > 1 && a.ptr[0] == '@' && a.len == domain_len + 1 && mg_strncasecmp(a.ptr + 1, domain, domain_len) == 0) { root = b.ptr; root_len = b.len; break; } } } // No filesystem access if (root == NULL || root_len == 0) return 0; // Handle URL rewrites mg_snprintf(buf, buf_len, "%.*s%s", root_len, root, uri); rewrites = conn->server->config_options[URL_REWRITES]; // Re-initialize! while ((rewrites = next_option(rewrites, &a, &b)) != NULL) { if ((match_len = mg_match_prefix(a.ptr, a.len, uri)) > 0) { mg_snprintf(buf, buf_len, "%.*s%s", (int) b.len, b.ptr, uri + match_len); break; } } if (stat(buf, st) == 0) return 1; #ifndef MONGOOSE_NO_CGI // Support PATH_INFO for CGI scripts. for (p = buf + strlen(root) + 2; *p != '\0'; p++) { if (*p == '/') { *p = '\0'; if (mg_match_prefix(cgi_pat, strlen(cgi_pat), buf) > 0 && !stat(buf, st)) { DBG(("!!!! [%s]", buf)); *p = '/'; conn->path_info = mg_strdup(p); *p = '\0'; return 1; } *p = '/'; } } #endif return 0; } #endif // MONGOOSE_NO_FILESYSTEM static int should_keep_alive(const struct mg_connection *conn) { struct connection *c = MG_CONN_2_CONN(conn); const char *method = conn->request_method; const char *http_version = conn->http_version; const char *header = mg_get_header(conn, "Connection"); return method != NULL && (!strcmp(method, "GET") || c->endpoint_type == EP_USER) && ((header != NULL && !mg_strcasecmp(header, "keep-alive")) || (header == NULL && http_version && !strcmp(http_version, "1.1"))); } size_t mg_write(struct mg_connection *c, const void *buf, size_t len) { struct connection *conn = MG_CONN_2_CONN(c); ns_send(conn->ns_conn, buf, len); return conn->ns_conn->send_iobuf.len; } void mg_send_status(struct mg_connection *c, int status) { struct connection *conn = MG_CONN_2_CONN(c); if (c->status_code == 0) { c->status_code = status; mg_printf(c, "HTTP/1.1 %d %s\r\n", status, status_code_to_str(status)); } conn->ns_conn->flags |= MG_USING_CHUNKED_API; } void mg_send_header(struct mg_connection *c, const char *name, const char *v) { struct connection *conn = MG_CONN_2_CONN(c); if (c->status_code == 0) { c->status_code = 200; mg_printf(c, "HTTP/1.1 %d %s\r\n", 200, status_code_to_str(200)); } mg_printf(c, "%s: %s\r\n", name, v); conn->ns_conn->flags |= MG_USING_CHUNKED_API; } static void terminate_headers(struct mg_connection *c) { struct connection *conn = MG_CONN_2_CONN(c); if (!(conn->ns_conn->flags & MG_HEADERS_SENT)) { mg_send_header(c, "Transfer-Encoding", "chunked"); mg_write(c, "\r\n", 2); conn->ns_conn->flags |= MG_HEADERS_SENT; } } size_t mg_send_data(struct mg_connection *c, const void *data, int data_len) { struct connection *conn = MG_CONN_2_CONN(c); terminate_headers(c); write_chunk(MG_CONN_2_CONN(c), (const char *) data, data_len); return conn->ns_conn->send_iobuf.len; } size_t mg_printf_data(struct mg_connection *c, const char *fmt, ...) { struct connection *conn = MG_CONN_2_CONN(c); va_list ap; int len; char mem[IOBUF_SIZE], *buf = mem; terminate_headers(c); va_start(ap, fmt); len = ns_avprintf(&buf, sizeof(mem), fmt, ap); va_end(ap); if (len >= 0) { write_chunk((struct connection *) conn, buf, len); } if (buf != mem && buf != NULL) { NS_FREE(buf); } return conn->ns_conn->send_iobuf.len; } #if !defined(MONGOOSE_NO_WEBSOCKET) || !defined(MONGOOSE_NO_AUTH) static int is_big_endian(void) { static const int n = 1; return ((char *) &n)[0] == 0; } #endif #ifndef MONGOOSE_NO_WEBSOCKET // START OF SHA-1 code // Copyright(c) By Steve Reid #define SHA1HANDSOFF #if defined(__sun) #include "solarisfixes.h" #endif union char64long16 { unsigned char c[64]; uint32_t l[16]; }; #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) static uint32_t blk0(union char64long16 *block, int i) { // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN if (!is_big_endian()) { block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF); } return block->l[i]; } /* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */ #undef blk #undef R0 #undef R1 #undef R2 #undef R3 #undef R4 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ ^block->l[(i+2)&15]^block->l[i&15],1)) #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30); #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); typedef struct { uint32_t state[5]; uint32_t count[2]; unsigned char buffer[64]; } SHA1_CTX; static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) { uint32_t a, b, c, d, e; union char64long16 block[1]; memcpy(block, buffer, 64); a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4]; R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3); R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7); R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11); R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15); R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19); R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23); R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27); R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31); R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35); R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39); R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43); R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47); R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51); R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55); R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59); R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63); R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67); R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71); R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75); R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79); state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; // Erase working structures. The order of operations is important, // used to ensure that compiler doesn't optimize those out. memset(block, 0, sizeof(block)); a = b = c = d = e = 0; (void) a; (void) b; (void) c; (void) d; (void) e; } static void SHA1Init(SHA1_CTX *context) { context->state[0] = 0x67452301; context->state[1] = 0xEFCDAB89; context->state[2] = 0x98BADCFE; context->state[3] = 0x10325476; context->state[4] = 0xC3D2E1F0; context->count[0] = context->count[1] = 0; } static void SHA1Update(SHA1_CTX *context, const unsigned char *data, size_t len) { size_t i, j; j = context->count[0]; if ((context->count[0] += len << 3) < j) context->count[1]++; context->count[1] += (len>>29); j = (j >> 3) & 63; if ((j + len) > 63) { memcpy(&context->buffer[j], data, (i = 64-j)); SHA1Transform(context->state, context->buffer); for ( ; i + 63 < len; i += 64) { SHA1Transform(context->state, &data[i]); } j = 0; } else i = 0; memcpy(&context->buffer[j], &data[i], len - i); } static void SHA1Final(unsigned char digest[20], SHA1_CTX *context) { unsigned i; unsigned char finalcount[8], c; for (i = 0; i < 8; i++) { finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3-(i & 3)) * 8) ) & 255); } c = 0200; SHA1Update(context, &c, 1); while ((context->count[0] & 504) != 448) { c = 0000; SHA1Update(context, &c, 1); } SHA1Update(context, finalcount, 8); for (i = 0; i < 20; i++) { digest[i] = (unsigned char) ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); } memset(context, '\0', sizeof(*context)); memset(&finalcount, '\0', sizeof(finalcount)); } // END OF SHA1 CODE static void base64_encode(const unsigned char *src, int src_len, char *dst) { static const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; int i, j, a, b, c; for (i = j = 0; i < src_len; i += 3) { a = src[i]; b = i + 1 >= src_len ? 0 : src[i + 1]; c = i + 2 >= src_len ? 0 : src[i + 2]; dst[j++] = b64[a >> 2]; dst[j++] = b64[((a & 3) << 4) | (b >> 4)]; if (i + 1 < src_len) { dst[j++] = b64[(b & 15) << 2 | (c >> 6)]; } if (i + 2 < src_len) { dst[j++] = b64[c & 63]; } } while (j % 4 != 0) { dst[j++] = '='; } dst[j++] = '\0'; } static void send_websocket_handshake(struct mg_connection *conn, const char *key) { static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; char buf[500], sha[20], b64_sha[sizeof(sha) * 2]; SHA1_CTX sha_ctx; mg_snprintf(buf, sizeof(buf), "%s%s", key, magic); SHA1Init(&sha_ctx); SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf)); SHA1Final((unsigned char *) sha, &sha_ctx); base64_encode((unsigned char *) sha, sizeof(sha), b64_sha); mg_snprintf(buf, sizeof(buf), "%s%s%s", "HTTP/1.1 101 Switching Protocols\r\n" "Upgrade: websocket\r\n" "Connection: Upgrade\r\n" "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n"); mg_write(conn, buf, strlen(buf)); } static size_t deliver_websocket_frame(struct connection *conn) { // Having buf unsigned char * is important, as it is used below in arithmetic unsigned char *buf = (unsigned char *) conn->ns_conn->recv_iobuf.buf; size_t i, len, buf_len = conn->ns_conn->recv_iobuf.len, frame_len = 0, mask_len = 0, header_len = 0, data_len = 0, buffered = 0; if (buf_len >= 2) { len = buf[1] & 127; mask_len = buf[1] & 128 ? 4 : 0; if (len < 126 && buf_len >= mask_len) { data_len = len; header_len = 2 + mask_len; } else if (len == 126 && buf_len >= 4 + mask_len) { header_len = 4 + mask_len; data_len = ((((size_t) buf[2]) << 8) + buf[3]); } else if (buf_len >= 10 + mask_len) { header_len = 10 + mask_len; data_len = (size_t) (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) + htonl(* (uint32_t *) &buf[6]); } } frame_len = header_len + data_len; buffered = frame_len > 0 && frame_len <= buf_len; if (buffered) { conn->mg_conn.content_len = data_len; conn->mg_conn.content = (char *) buf + header_len; conn->mg_conn.wsbits = buf[0]; // Apply mask if necessary if (mask_len > 0) { for (i = 0; i < data_len; i++) { buf[i + header_len] ^= (buf + header_len - mask_len)[i % 4]; } } // Call the handler and remove frame from the iobuf if (call_user(conn, MG_REQUEST) == MG_FALSE) { conn->ns_conn->flags |= NSF_FINISHED_SENDING_DATA; } iobuf_remove(&conn->ns_conn->recv_iobuf, frame_len); } return buffered; } size_t mg_websocket_write(struct mg_connection *conn, int opcode, const char *data, size_t data_len) { unsigned char mem[4192], *copy = mem; size_t copy_len = 0; /* Check overflow */ if (data_len > ~(size_t)0 - (size_t)10) { return 0; } if (data_len + 10 > sizeof(mem) && (copy = (unsigned char *) NS_MALLOC(data_len + 10)) == NULL) { return 0; } copy[0] = 0x80 + (opcode & 0x0f); // Frame format: http://tools.ietf.org/html/rfc6455#section-5.2 if (data_len < 126) { // Inline 7-bit length field copy[1] = data_len; memcpy(copy + 2, data, data_len); copy_len = 2 + data_len; } else if (data_len <= 0xFFFF) { // 16-bit length field copy[1] = 126; * (uint16_t *) (copy + 2) = (uint16_t) htons((uint16_t) data_len); memcpy(copy + 4, data, data_len); copy_len = 4 + data_len; } else { // 64-bit length field const uint32_t hi = htonl((uint32_t) ((uint64_t) data_len >> 32)); const uint32_t lo = htonl(data_len & 0xffffffff); copy[1] = 127; memcpy(copy+2,&hi,sizeof(hi)); memcpy(copy+6,&lo,sizeof(lo)); memcpy(copy + 10, data, data_len); copy_len = 10 + data_len; } if (copy_len > 0) { mg_write(conn, copy, copy_len); } if (copy != mem) { NS_FREE(copy); } // If we send closing frame, schedule a connection to be closed after // data is drained to the client. if (opcode == WEBSOCKET_OPCODE_CONNECTION_CLOSE) { MG_CONN_2_CONN(conn)->ns_conn->flags |= NSF_FINISHED_SENDING_DATA; } return MG_CONN_2_CONN(conn)->ns_conn->send_iobuf.len; } size_t mg_websocket_printf(struct mg_connection *conn, int opcode, const char *fmt, ...) { char mem[4192], *buf = mem; va_list ap; int len; va_start(ap, fmt); if ((len = ns_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) { mg_websocket_write(conn, opcode, buf, len); } va_end(ap); if (buf != mem && buf != NULL) { NS_FREE(buf); } return MG_CONN_2_CONN(conn)->ns_conn->send_iobuf.len; } static void send_websocket_handshake_if_requested(struct mg_connection *conn) { const char *ver = mg_get_header(conn, "Sec-WebSocket-Version"), *key = mg_get_header(conn, "Sec-WebSocket-Key"); if (ver != NULL && key != NULL) { conn->is_websocket = 1; if (call_user(MG_CONN_2_CONN(conn), MG_WS_HANDSHAKE) == MG_FALSE) { send_websocket_handshake(conn, key); } call_user(MG_CONN_2_CONN(conn), MG_WS_CONNECT); } } static void ping_idle_websocket_connection(struct connection *conn, time_t t) { if (t - conn->ns_conn->last_io_time > MONGOOSE_USE_WEBSOCKET_PING_INTERVAL) { mg_websocket_write(&conn->mg_conn, WEBSOCKET_OPCODE_PING, "", 0); } } #else #define ping_idle_websocket_connection(conn, t) #endif // !MONGOOSE_NO_WEBSOCKET static void write_terminating_chunk(struct connection *conn) { mg_write(&conn->mg_conn, "0\r\n\r\n", 5); } static int call_request_handler(struct connection *conn) { int result; conn->mg_conn.content = conn->ns_conn->recv_iobuf.buf; if ((result = call_user(conn, MG_REQUEST)) == MG_TRUE) { if (conn->ns_conn->flags & MG_USING_CHUNKED_API) { terminate_headers(&conn->mg_conn); write_terminating_chunk(conn); } close_local_endpoint(conn); } return result; } const char *mg_get_mime_type(const char *path, const char *default_mime_type) { const char *ext; size_t i, path_len; path_len = strlen(path); for (i = 0; static_builtin_mime_types[i].extension != NULL; i++) { ext = path + (path_len - static_builtin_mime_types[i].ext_len); if (path_len > static_builtin_mime_types[i].ext_len && mg_strcasecmp(ext, static_builtin_mime_types[i].extension) == 0) { return static_builtin_mime_types[i].mime_type; } } return default_mime_type; } #ifndef MONGOOSE_NO_FILESYSTEM // Convert month to the month number. Return -1 on error, or month number static int get_month_index(const char *s) { static const char *month_names[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; int i; for (i = 0; i < (int) ARRAY_SIZE(month_names); i++) if (!strcmp(s, month_names[i])) return i; return -1; } static int num_leap_years(int year) { return year / 4 - year / 100 + year / 400; } // Parse UTC date-time string, and return the corresponding time_t value. static time_t parse_date_string(const char *datetime) { static const unsigned short days_before_month[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; char month_str[32]; int second, minute, hour, day, month, year, leap_days, days; time_t result = (time_t) 0; if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%d %3s %d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6) || (sscanf(datetime, "%d-%3s-%d %d:%d:%d", &day, month_str, &year, &hour, &minute, &second) == 6)) && year > 1970 && (month = get_month_index(month_str)) != -1) { leap_days = num_leap_years(year) - num_leap_years(1970); year -= 1970; days = year * 365 + days_before_month[month] + (day - 1) + leap_days; result = days * 24 * 3600 + hour * 3600 + minute * 60 + second; } return result; } // Look at the "path" extension and figure what mime type it has. // Store mime type in the vector. static void get_mime_type(const struct mg_server *server, const char *path, struct vec *vec) { struct vec ext_vec, mime_vec; const char *list, *ext; size_t path_len; path_len = strlen(path); // Scan user-defined mime types first, in case user wants to // override default mime types. list = server->config_options[EXTRA_MIME_TYPES]; while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { // ext now points to the path suffix ext = path + path_len - ext_vec.len; if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { *vec = mime_vec; return; } } vec->ptr = mg_get_mime_type(path, "text/plain"); vec->len = strlen(vec->ptr); } static const char *suggest_connection_header(const struct mg_connection *conn) { return should_keep_alive(conn) ? "keep-alive" : "close"; } static void construct_etag(char *buf, size_t buf_len, const file_stat_t *st) { mg_snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"", (unsigned long) st->st_mtime, (int64_t) st->st_size); } // Return True if we should reply 304 Not Modified. static int is_not_modified(const struct connection *conn, const file_stat_t *stp) { char etag[64]; const char *ims = mg_get_header(&conn->mg_conn, "If-Modified-Since"); const char *inm = mg_get_header(&conn->mg_conn, "If-None-Match"); construct_etag(etag, sizeof(etag), stp); return (inm != NULL && !mg_strcasecmp(etag, inm)) || (ims != NULL && stp->st_mtime <= parse_date_string(ims)); } // For given directory path, substitute it to valid index file. // Return 0 if index file has been found, -1 if not found. // If the file is found, it's stats is returned in stp. static int find_index_file(struct connection *conn, char *path, size_t path_len, file_stat_t *stp) { const char *list = conn->server->config_options[INDEX_FILES]; file_stat_t st; struct vec filename_vec; size_t n = strlen(path); int found = 0; // The 'path' given to us points to the directory. Remove all trailing // directory separator characters from the end of the path, and // then append single directory separator character. while (n > 0 && path[n - 1] == '/') { n--; } path[n] = '/'; // Traverse index files list. For each entry, append it to the given // path and see if the file exists. If it exists, break the loop while ((list = next_option(list, &filename_vec, NULL)) != NULL) { if (path_len <= n + 2) { continue; } // Ignore too long entries that may overflow path buffer if (filename_vec.len > (path_len - (n + 2))) continue; // Prepare full path to the index file strncpy(path + n + 1, filename_vec.ptr, filename_vec.len); path[n + 1 + filename_vec.len] = '\0'; //DBG(("[%s]", path)); // Does it exist? if (!stat(path, &st)) { // Yes it does, break the loop *stp = st; found = 1; break; } } // If no index file exists, restore directory path if (!found) { path[n] = '\0'; } return found; } static int parse_range_header(const char *header, int64_t *a, int64_t *b) { return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b); } static void gmt_time_string(char *buf, size_t buf_len, time_t *t) { strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t)); } static void open_file_endpoint(struct connection *conn, const char *path, file_stat_t *st, const char *extra_headers) { char date[64], lm[64], etag[64], range[64], headers[1000]; const char *msg = "OK", *hdr; time_t curtime = time(NULL); int64_t r1, r2; struct vec mime_vec; int n; conn->endpoint_type = EP_FILE; ns_set_close_on_exec(conn->endpoint.fd); conn->mg_conn.status_code = 200; get_mime_type(conn->server, path, &mime_vec); conn->cl = st->st_size; range[0] = '\0'; // If Range: header specified, act accordingly r1 = r2 = 0; hdr = mg_get_header(&conn->mg_conn, "Range"); if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 && r1 >= 0 && r2 >= 0) { conn->mg_conn.status_code = 206; conn->cl = n == 2 ? (r2 > conn->cl ? conn->cl : r2) - r1 + 1: conn->cl - r1; mg_snprintf(range, sizeof(range), "Content-Range: bytes " "%" INT64_FMT "-%" INT64_FMT "/%" INT64_FMT "\r\n", r1, r1 + conn->cl - 1, (int64_t) st->st_size); msg = "Partial Content"; lseek(conn->endpoint.fd, r1, SEEK_SET); } // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3 gmt_time_string(date, sizeof(date), &curtime); gmt_time_string(lm, sizeof(lm), &st->st_mtime); construct_etag(etag, sizeof(etag), st); n = mg_snprintf(headers, sizeof(headers), "HTTP/1.1 %d %s\r\n" "Date: %s\r\n" "Last-Modified: %s\r\n" "Etag: %s\r\n" "Content-Type: %.*s\r\n" "Content-Length: %" INT64_FMT "\r\n" "Connection: %s\r\n" "Accept-Ranges: bytes\r\n" "%s%s%s\r\n", conn->mg_conn.status_code, msg, date, lm, etag, (int) mime_vec.len, mime_vec.ptr, conn->cl, suggest_connection_header(&conn->mg_conn), range, extra_headers == NULL ? "" : extra_headers, MONGOOSE_USE_EXTRA_HTTP_HEADERS); ns_send(conn->ns_conn, headers, n); if (!strcmp(conn->mg_conn.request_method, "HEAD")) { conn->ns_conn->flags |= NSF_FINISHED_SENDING_DATA; close(conn->endpoint.fd); conn->endpoint_type = EP_NONE; } } void mg_send_file_data(struct mg_connection *c, int fd) { struct connection *conn = MG_CONN_2_CONN(c); conn->endpoint_type = EP_FILE; conn->endpoint.fd = fd; ns_set_close_on_exec(conn->endpoint.fd); } #endif // MONGOOSE_NO_FILESYSTEM static void call_request_handler_if_data_is_buffered(struct connection *conn) { #ifndef MONGOOSE_NO_WEBSOCKET if (conn->mg_conn.is_websocket) { do { } while (deliver_websocket_frame(conn)); } else #endif if (conn->num_bytes_recv >= (conn->cl + conn->request_len) && call_request_handler(conn) == MG_FALSE) { open_local_endpoint(conn, 1); } } #if !defined(MONGOOSE_NO_DIRECTORY_LISTING) || !defined(MONGOOSE_NO_DAV) #ifdef _WIN32 struct dirent { char d_name[MAX_PATH_SIZE]; }; typedef struct DIR { HANDLE handle; WIN32_FIND_DATAW info; struct dirent result; } DIR; // Implementation of POSIX opendir/closedir/readdir for Windows. static DIR *opendir(const char *name) { DIR *dir = NULL; wchar_t wpath[MAX_PATH_SIZE]; DWORD attrs; if (name == NULL) { SetLastError(ERROR_BAD_ARGUMENTS); } else if ((dir = (DIR *) NS_MALLOC(sizeof(*dir))) == NULL) { SetLastError(ERROR_NOT_ENOUGH_MEMORY); } else { to_wchar(name, wpath, ARRAY_SIZE(wpath)); attrs = GetFileAttributesW(wpath); if (attrs != 0xFFFFFFFF && ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) { (void) wcscat(wpath, L"\\*"); dir->handle = FindFirstFileW(wpath, &dir->info); dir->result.d_name[0] = '\0'; } else { NS_FREE(dir); dir = NULL; } } return dir; } static int closedir(DIR *dir) { int result = 0; if (dir != NULL) { if (dir->handle != INVALID_HANDLE_VALUE) result = FindClose(dir->handle) ? 0 : -1; NS_FREE(dir); } else { result = -1; SetLastError(ERROR_BAD_ARGUMENTS); } return result; } static struct dirent *readdir(DIR *dir) { struct dirent *result = 0; if (dir) { if (dir->handle != INVALID_HANDLE_VALUE) { result = &dir->result; (void) WideCharToMultiByte(CP_UTF8, 0, dir->info.cFileName, -1, result->d_name, sizeof(result->d_name), NULL, NULL); if (!FindNextFileW(dir->handle, &dir->info)) { (void) FindClose(dir->handle); dir->handle = INVALID_HANDLE_VALUE; } } else { SetLastError(ERROR_FILE_NOT_FOUND); } } else { SetLastError(ERROR_BAD_ARGUMENTS); } return result; } #endif // _WIN32 POSIX opendir/closedir/readdir implementation static int scan_directory(struct connection *conn, const char *dir, struct dir_entry **arr) { char path[MAX_PATH_SIZE]; struct dir_entry *p; struct dirent *dp; int arr_size = 0, arr_ind = 0, inc = 100; DIR *dirp; *arr = NULL; if ((dirp = (opendir(dir))) == NULL) return 0; while ((dp = readdir(dirp)) != NULL) { // Do not show current dir and hidden files if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..") || must_hide_file(conn, dp->d_name)) { continue; } mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name); // Resize the array if nesessary if (arr_ind >= arr_size) { if ((p = (struct dir_entry *) NS_REALLOC(*arr, (inc + arr_size) * sizeof(**arr))) != NULL) { // Memset new chunk to zero, otherwize st_mtime will have garbage which // can make strftime() segfault, see // http://code.google.com/p/mongoose/issues/detail?id=79 memset(p + arr_size, 0, sizeof(**arr) * inc); *arr = p; arr_size += inc; } } if (arr_ind < arr_size) { (*arr)[arr_ind].conn = conn; (*arr)[arr_ind].file_name = strdup(dp->d_name); stat(path, &(*arr)[arr_ind].st); arr_ind++; } } closedir(dirp); return arr_ind; } size_t mg_url_encode(const char *src, size_t s_len, char *dst, size_t dst_len) { static const char *dont_escape = "._-$,;~()"; static const char *hex = "0123456789abcdef"; size_t i = 0, j = 0; for (i = j = 0; dst_len > 0 && i < s_len && j + 2 < dst_len - 1; i++, j++) { if (isalnum(* (const unsigned char *) (src + i)) || strchr(dont_escape, * (const unsigned char *) (src + i)) != NULL) { dst[j] = src[i]; } else if (j + 3 < dst_len) { dst[j] = '%'; dst[j + 1] = hex[(* (const unsigned char *) (src + i)) >> 4]; dst[j + 2] = hex[(* (const unsigned char *) (src + i)) & 0xf]; j += 2; } } dst[j] = '\0'; return j; } #endif // !NO_DIRECTORY_LISTING || !MONGOOSE_NO_DAV #ifndef MONGOOSE_NO_DIRECTORY_LISTING static void print_dir_entry(const struct dir_entry *de) { char size[64], mod[64], href[MAX_PATH_SIZE * 3]; int64_t fsize = de->st.st_size; int is_dir = S_ISDIR(de->st.st_mode); const char *slash = is_dir ? "/" : ""; if (is_dir) { mg_snprintf(size, sizeof(size), "%s", "[DIRECTORY]"); } else { // We use (signed) cast below because MSVC 6 compiler cannot // convert unsigned __int64 to double. if (fsize < 1024) { mg_snprintf(size, sizeof(size), "%d", (int) fsize); } else if (fsize < 0x100000) { mg_snprintf(size, sizeof(size), "%.1fk", (double) fsize / 1024.0); } else if (fsize < 0x40000000) { mg_snprintf(size, sizeof(size), "%.1fM", (double) fsize / 1048576); } else { mg_snprintf(size, sizeof(size), "%.1fG", (double) fsize / 1073741824); } } strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.st_mtime)); mg_url_encode(de->file_name, strlen(de->file_name), href, sizeof(href)); mg_printf_data(&de->conn->mg_conn, "%s%s" " %s  %s\n", href, slash, de->file_name, slash, mod, size); } // Sort directory entries by size, or name, or modification time. // On windows, __cdecl specification is needed in case if project is built // with __stdcall convention. qsort always requires __cdels callback. static int __cdecl compare_dir_entries(const void *p1, const void *p2) { const struct dir_entry *a = (const struct dir_entry *) p1, *b = (const struct dir_entry *) p2; const char *qs = a->conn->mg_conn.query_string ? a->conn->mg_conn.query_string : "na"; int cmp_result = 0; if (S_ISDIR(a->st.st_mode) && !S_ISDIR(b->st.st_mode)) { return -1; // Always put directories on top } else if (!S_ISDIR(a->st.st_mode) && S_ISDIR(b->st.st_mode)) { return 1; // Always put directories on top } else if (*qs == 'n') { cmp_result = strcmp(a->file_name, b->file_name); } else if (*qs == 's') { cmp_result = a->st.st_size == b->st.st_size ? 0 : a->st.st_size > b->st.st_size ? 1 : -1; } else if (*qs == 'd') { cmp_result = a->st.st_mtime == b->st.st_mtime ? 0 : a->st.st_mtime > b->st.st_mtime ? 1 : -1; } return qs[1] == 'd' ? -cmp_result : cmp_result; } static void send_directory_listing(struct connection *conn, const char *dir) { struct dir_entry *arr = NULL; int i, num_entries, sort_direction = conn->mg_conn.query_string != NULL && conn->mg_conn.query_string[1] == 'd' ? 'a' : 'd'; mg_send_header(&conn->mg_conn, "Transfer-Encoding", "chunked"); mg_send_header(&conn->mg_conn, "Content-Type", "text/html; charset=utf-8"); mg_printf_data(&conn->mg_conn, "Index of %s" "" "

Index of %s

"
              ""
              ""
              ""
              "",
              conn->mg_conn.uri, conn->mg_conn.uri,
              sort_direction, sort_direction, sort_direction);

  num_entries = scan_directory(conn, dir, &arr);
  qsort(arr, num_entries, sizeof(arr[0]), compare_dir_entries);
  for (i = 0; i < num_entries; i++) {
    print_dir_entry(&arr[i]);
    NS_FREE(arr[i].file_name);
  }
  NS_FREE(arr);

  write_terminating_chunk(conn);
  close_local_endpoint(conn);
}
#endif  // MONGOOSE_NO_DIRECTORY_LISTING

#ifndef MONGOOSE_NO_DAV
static void print_props(struct connection *conn, const char *uri,
                        file_stat_t *stp) {
  char mtime[64];

  gmt_time_string(mtime, sizeof(mtime), &stp->st_mtime);
  mg_printf(&conn->mg_conn,
      ""
       "%s"
       ""
        ""
         "%s"
         "%" INT64_FMT ""
         "%s"
        ""
        "HTTP/1.1 200 OK"
       ""
      "\n",
      uri, S_ISDIR(stp->st_mode) ? "" : "",
      (int64_t) stp->st_size, mtime);
}

static void handle_propfind(struct connection *conn, const char *path,
                            file_stat_t *stp, int exists) {
  static const char header[] = "HTTP/1.1 207 Multi-Status\r\n"
    "Connection: close\r\n"
    "Content-Type: text/xml; charset=utf-8\r\n\r\n"
    ""
    "\n";
  static const char footer[] = "";
  const char *depth = mg_get_header(&conn->mg_conn, "Depth");
#ifdef MONGOOSE_NO_DIRECTORY_LISTING
  const char *list_dir = "no";
#else
  const char *list_dir = conn->server->config_options[ENABLE_DIRECTORY_LISTING];
#endif

  conn->mg_conn.status_code = 207;

  // Print properties for the requested resource itself
  if (!exists) {
    conn->mg_conn.status_code = 404;
    mg_printf(&conn->mg_conn, "%s", "HTTP/1.1 404 Not Found\r\n\r\n");
  } else if (S_ISDIR(stp->st_mode) && mg_strcasecmp(list_dir, "yes") != 0) {
    conn->mg_conn.status_code = 403;
    mg_printf(&conn->mg_conn, "%s",
              "HTTP/1.1 403 Directory Listing Denied\r\n\r\n");
  } else {
    ns_send(conn->ns_conn, header, sizeof(header) - 1);
    print_props(conn, conn->mg_conn.uri, stp);

    if (S_ISDIR(stp->st_mode) &&
             (depth == NULL || strcmp(depth, "0") != 0)) {
      struct dir_entry *arr = NULL;
      int i, num_entries = scan_directory(conn, path, &arr);

      for (i = 0; i < num_entries; i++) {
        char buf[MAX_PATH_SIZE * 3];
        struct dir_entry *de = &arr[i];
        mg_url_encode(de->file_name, strlen(de->file_name), buf, sizeof(buf));
        print_props(conn, buf, &de->st);
        NS_FREE(de->file_name);
      }
      NS_FREE(arr);
    }
    ns_send(conn->ns_conn, footer, sizeof(footer) - 1);
  }

  close_local_endpoint(conn);
}

static void handle_mkcol(struct connection *conn, const char *path) {
  int status_code = 500;

  if (conn->mg_conn.content_len > 0) {
    status_code = 415;
  } else if (!mkdir(path, 0755)) {
    status_code = 201;
  } else if (errno == EEXIST) {
    status_code = 405;
  } else if (errno == EACCES) {
    status_code = 403;
  } else if (errno == ENOENT) {
    status_code = 409;
  }
  send_http_error(conn, status_code, NULL);
}

static int remove_directory(const char *dir) {
  char path[MAX_PATH_SIZE];
  struct dirent *dp;
  file_stat_t st;
  DIR *dirp;

  if ((dirp = opendir(dir)) == NULL) return 0;

  while ((dp = readdir(dirp)) != NULL) {
    if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue;
    mg_snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
    stat(path, &st);
    if (S_ISDIR(st.st_mode)) {
      remove_directory(path);
    } else {
      remove(path);
    }
  }
  closedir(dirp);
  rmdir(dir);

  return 1;
}

static void handle_delete(struct connection *conn, const char *path) {
  file_stat_t st;

  if (stat(path, &st) != 0) {
    send_http_error(conn, 404, NULL);
  } else if (S_ISDIR(st.st_mode)) {
    remove_directory(path);
    send_http_error(conn, 204, NULL);
  } else if (remove(path) == 0) {
    send_http_error(conn, 204, NULL);
  } else {
    send_http_error(conn, 423, NULL);
  }
}

// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(const char *path) {
  char buf[MAX_PATH_SIZE];
  const char *s, *p;
  file_stat_t st;

  // Create intermediate directories if they do not exist
  for (s = p = path + 1; (p = strchr(s, '/')) != NULL; s = ++p) {
    if (p - path >= (int) sizeof(buf)) return -1; // Buffer overflow
    memcpy(buf, path, p - path);
    buf[p - path] = '\0';
    if (stat(buf, &st) != 0 && mkdir(buf, 0755) != 0) return -1;
    if (p[1] == '\0') return 0;  // Path is a directory itself
  }

  return 1;
}

static void handle_put(struct connection *conn, const char *path) {
  file_stat_t st;
  const char *range, *cl_hdr = mg_get_header(&conn->mg_conn, "Content-Length");
  int64_t r1, r2;
  int rc;

  conn->mg_conn.status_code = !stat(path, &st) ? 200 : 201;
  if ((rc = put_dir(path)) == 0) {
    mg_printf(&conn->mg_conn, "HTTP/1.1 %d OK\r\n\r\n",
              conn->mg_conn.status_code);
    close_local_endpoint(conn);
  } else if (rc == -1) {
    send_http_error(conn, 500, "put_dir: %s", strerror(errno));
  } else if (cl_hdr == NULL) {
    send_http_error(conn, 411, NULL);
  } else if ((conn->endpoint.fd =
              open(path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0644)) < 0) {
    send_http_error(conn, 500, "open(%s): %s", path, strerror(errno));
  } else {
    DBG(("PUT [%s] %lu", path, (unsigned long) conn->ns_conn->recv_iobuf.len));
    conn->endpoint_type = EP_PUT;
    ns_set_close_on_exec(conn->endpoint.fd);
    range = mg_get_header(&conn->mg_conn, "Content-Range");
    conn->cl = to64(cl_hdr);
    r1 = r2 = 0;
    if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
      conn->mg_conn.status_code = 206;
      lseek(conn->endpoint.fd, r1, SEEK_SET);
      conn->cl = r2 > r1 ? r2 - r1 + 1: conn->cl - r1;
    }
    mg_printf(&conn->mg_conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
              conn->mg_conn.status_code);
  }
}

static void forward_put_data(struct connection *conn) {
  struct iobuf *io = &conn->ns_conn->recv_iobuf;
  size_t k = conn->cl < (int64_t) io->len ? conn->cl : (int64_t) io->len;   // To write
  size_t n = write(conn->endpoint.fd, io->buf, k);   // Write them!
  if (n > 0) {
    iobuf_remove(io, n);
    conn->cl -= n;
  }
  if (conn->cl <= 0) {
    close_local_endpoint(conn);
  }
}
#endif //  MONGOOSE_NO_DAV

static void send_options(struct connection *conn) {
  conn->mg_conn.status_code = 200;
  mg_printf(&conn->mg_conn, "%s",
            "HTTP/1.1 200 OK\r\nAllow: GET, POST, HEAD, CONNECT, PUT, "
            "DELETE, OPTIONS, PROPFIND, MKCOL\r\nDAV: 1\r\n\r\n");
  close_local_endpoint(conn);
}

#ifndef MONGOOSE_NO_AUTH
void mg_send_digest_auth_request(struct mg_connection *c) {
  struct connection *conn = MG_CONN_2_CONN(c);
  c->status_code = 401;
  mg_printf(c,
            "HTTP/1.1 401 Unauthorized\r\n"
            "WWW-Authenticate: Digest qop=\"auth\", "
            "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
            conn->server->config_options[AUTH_DOMAIN],
            (unsigned long) time(NULL));
  close_local_endpoint(conn);
}

// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static FILE *open_auth_file(struct connection *conn, const char *path,
                            int is_directory) {
  char name[MAX_PATH_SIZE];
  const char *p, *gpass = conn->server->config_options[GLOBAL_AUTH_FILE];
  FILE *fp = NULL;

  if (gpass != NULL) {
    // Use global passwords file
    fp = fopen(gpass, "r");
  } else if (is_directory) {
    mg_snprintf(name, sizeof(name), "%s%c%s", path, '/', PASSWORDS_FILE_NAME);
    fp = fopen(name, "r");
  } else {
    // Try to find .htpasswd in requested directory.
    if ((p = strrchr(path, '/')) == NULL) p = path;
    mg_snprintf(name, sizeof(name), "%.*s%c%s",
                (int) (p - path), path, '/', PASSWORDS_FILE_NAME);
    fp = fopen(name, "r");
  }

  return fp;
}

#if !defined(HAVE_MD5) && !defined(MONGOOSE_NO_AUTH)
/*
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest.	This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 *
 * Equivalent code is available from RSA Data Security, Inc.
 * This code has been tested against that, and is equivalent,
 * except that you don't need to include two pages of legalese
 * with every copy.
 *
 * To compute the message digest of a chunk of bytes, declare an
 * MD5Context structure, pass it to MD5Init, call MD5Update as
 * needed on buffers full of bytes, and then call MD5Final, which
 * will fill a supplied 16-byte array with the digest.
 */

typedef struct MD5Context {
  uint32_t buf[4];
  uint32_t bits[2];
  unsigned char in[64];
} MD5_CTX;

static void byteReverse(unsigned char *buf, unsigned longs) {
  uint32_t t;

  // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
  if (is_big_endian()) {
    do {
      t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
        ((unsigned) buf[1] << 8 | buf[0]);
      * (uint32_t *) buf = t;
      buf += 4;
    } while (--longs);
  }
}

#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

#define MD5STEP(f, w, x, y, z, data, s) \
  ( w += f(x, y, z) + data,  w = w<>(32-s),  w += x )

// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
  ctx->buf[0] = 0x67452301;
  ctx->buf[1] = 0xefcdab89;
  ctx->buf[2] = 0x98badcfe;
  ctx->buf[3] = 0x10325476;

  ctx->bits[0] = 0;
  ctx->bits[1] = 0;
}

static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  register uint32_t a, b, c, d;

  a = buf[0];
  b = buf[1];
  c = buf[2];
  d = buf[3];

  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

  buf[0] += a;
  buf[1] += b;
  buf[2] += c;
  buf[3] += d;
}

static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  uint32_t t;

  t = ctx->bits[0];
  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
    ctx->bits[1]++;
  ctx->bits[1] += len >> 29;

  t = (t >> 3) & 0x3f;

  if (t) {
    unsigned char *p = (unsigned char *) ctx->in + t;

    t = 64 - t;
    if (len < t) {
      memcpy(p, buf, len);
      return;
    }
    memcpy(p, buf, t);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
    buf += t;
    len -= t;
  }

  while (len >= 64) {
    memcpy(ctx->in, buf, 64);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
    buf += 64;
    len -= 64;
  }

  memcpy(ctx->in, buf, len);
}

static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  unsigned count;
  unsigned char *p;
  uint32_t *a;

  count = (ctx->bits[0] >> 3) & 0x3F;

  p = ctx->in + count;
  *p++ = 0x80;
  count = 64 - 1 - count;
  if (count < 8) {
    memset(p, 0, count);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
    memset(ctx->in, 0, 56);
  } else {
    memset(p, 0, count - 8);
  }
  byteReverse(ctx->in, 14);

  a = (uint32_t *)ctx->in;
  a[14] = ctx->bits[0];
  a[15] = ctx->bits[1];

  MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  byteReverse((unsigned char *) ctx->buf, 4);
  memcpy(digest, ctx->buf, 16);
  memset((char *) ctx, 0, sizeof(*ctx));
}
#endif // !HAVE_MD5



// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
  static const char *hex = "0123456789abcdef";

  for (; len--; p++) {
    *to++ = hex[p[0] >> 4];
    *to++ = hex[p[0] & 0x0f];
  }
  *to = '\0';
}

// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
char *mg_md5(char buf[33], ...) {
  unsigned char hash[16];
  const char *p;
  va_list ap;
  MD5_CTX ctx;

  MD5Init(&ctx);

  va_start(ap, buf);
  while ((p = va_arg(ap, const char *)) != NULL) {
    MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  }
  va_end(ap);

  MD5Final(hash, &ctx);
  bin2str(buf, hash, sizeof(hash));
  return buf;
}

// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
                          const char *nonce, const char *nc, const char *cnonce,
                          const char *qop, const char *response) {
  char ha2[32 + 1], expected_response[32 + 1];

#if 0
  // Check for authentication timeout
  if ((unsigned long) time(NULL) - (unsigned long) to64(nonce) > 3600 * 2) {
    return 0;
  }
#endif

  mg_md5(ha2, method, ":", uri, NULL);
  mg_md5(expected_response, ha1, ":", nonce, ":", nc,
      ":", cnonce, ":", qop, ":", ha2, NULL);

  return mg_strcasecmp(response, expected_response) == 0 ? MG_TRUE : MG_FALSE;
}


// Authorize against the opened passwords file. Return 1 if authorized.
int mg_authorize_digest(struct mg_connection *c, FILE *fp) {
  struct connection *conn = MG_CONN_2_CONN(c);
  const char *hdr;
  char line[256], f_user[256], ha1[256], f_domain[256], user[100], nonce[100],
       uri[MAX_REQUEST_SIZE], cnonce[100], resp[100], qop[100], nc[100];

  if (c == NULL || fp == NULL) return 0;
  if ((hdr = mg_get_header(c, "Authorization")) == NULL ||
      mg_strncasecmp(hdr, "Digest ", 7) != 0) return 0;
  if (!mg_parse_header(hdr, "username", user, sizeof(user))) return 0;
  if (!mg_parse_header(hdr, "cnonce", cnonce, sizeof(cnonce))) return 0;
  if (!mg_parse_header(hdr, "response", resp, sizeof(resp))) return 0;
  if (!mg_parse_header(hdr, "uri", uri, sizeof(uri))) return 0;
  if (!mg_parse_header(hdr, "qop", qop, sizeof(qop))) return 0;
  if (!mg_parse_header(hdr, "nc", nc, sizeof(nc))) return 0;
  if (!mg_parse_header(hdr, "nonce", nonce, sizeof(nonce))) return 0;

  while (fgets(line, sizeof(line), fp) != NULL) {
    if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) == 3 &&
        !strcmp(user, f_user) &&
        // NOTE(lsm): due to a bug in MSIE, we do not compare URIs
        !strcmp(conn->server->config_options[AUTH_DOMAIN], f_domain))
      return check_password(c->request_method, ha1, uri,
                            nonce, nc, cnonce, qop, resp);
  }
  return MG_FALSE;
}


// Return 1 if request is authorised, 0 otherwise.
static int is_authorized(struct connection *conn, const char *path,
                         int is_directory) {
  FILE *fp;
  int authorized = MG_TRUE;

  if ((fp = open_auth_file(conn, path, is_directory)) != NULL) {
    authorized = mg_authorize_digest(&conn->mg_conn, fp);
    fclose(fp);
  }

  return authorized;
}

static int is_authorized_for_dav(struct connection *conn) {
  const char *auth_file = conn->server->config_options[DAV_AUTH_FILE];
  const char *method = conn->mg_conn.request_method;
  FILE *fp;
  int authorized = MG_FALSE;

  // If dav_auth_file is not set, allow non-authorized PROPFIND
  if (method != NULL && !strcmp(method, "PROPFIND") && auth_file == NULL) {
    authorized = MG_TRUE;
  } else if (auth_file != NULL && (fp = fopen(auth_file, "r")) != NULL) {
    authorized = mg_authorize_digest(&conn->mg_conn, fp);
    fclose(fp);
  }

  return authorized;
}
#endif // MONGOOSE_NO_AUTH

static int parse_header(const char *str, size_t str_len, const char *var_name,
                        char *buf, size_t buf_size) {
  int ch = ' ', ch1 = ',', len = 0;
  size_t n = strlen(var_name);
  const char *p, *end = str + str_len, *s = NULL;

  if (buf != NULL && buf_size > 0) buf[0] = '\0';

  // Find where variable starts
  for (s = str; s != NULL && s + n < end; s++) {
    if ((s == str || s[-1] == ch || s[-1] == ch1) && s[n] == '=' &&
        !memcmp(s, var_name, n)) break;
  }

  if (s != NULL && &s[n + 1] < end) {
    s += n + 1;
    if (*s == '"' || *s == '\'') ch = ch1 = *s++;
    p = s;
    while (p < end && p[0] != ch && p[0] != ch1 && len < (int) buf_size) {
      if (ch == ch1 && p[0] == '\\' && p[1] == ch) p++;
      buf[len++] = *p++;
    }
    if (len >= (int) buf_size || (ch != ' ' && *p != ch)) {
      len = 0;
    } else {
      if (len > 0 && s[len - 1] == ',') len--;
      if (len > 0 && s[len - 1] == ';') len--;
      buf[len] = '\0';
    }
  }

  return len;
}

int mg_parse_header(const char *s, const char *var_name, char *buf,
                    size_t buf_size) {
  return parse_header(s, s == NULL ? 0 : strlen(s), var_name, buf, buf_size);
}

#ifndef MONGOOSE_NO_SSI
static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);

static void send_file_data(struct mg_connection *conn, FILE *fp) {
  char buf[IOBUF_SIZE];
  size_t n;
  while ((n = fread(buf, 1, sizeof(buf), fp)) > 0) {
    mg_write(conn, buf, n);
  }
}

static void do_ssi_include(struct mg_connection *conn, const char *ssi,
                           char *tag, int include_level) {
  char file_name[IOBUF_SIZE], path[MAX_PATH_SIZE], *p;
  char **opts = (MG_CONN_2_CONN(conn))->server->config_options;
  FILE *fp;

  // sscanf() is safe here, since send_ssi_file() also uses buffer
  // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
    // File name is relative to the webserver root
    mg_snprintf(path, sizeof(path), "%s%c%s",
                opts[DOCUMENT_ROOT], '/', file_name);
  } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
    // File name is relative to the webserver working directory
    // or it is absolute system path
    mg_snprintf(path, sizeof(path), "%s", file_name);
  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
             sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
    // File name is relative to the currect document
    mg_snprintf(path, sizeof(path), "%s", ssi);
    if ((p = strrchr(path, '/')) != NULL) {
      p[1] = '\0';
    }
    mg_snprintf(path + strlen(path), sizeof(path) - strlen(path), "%s",
                file_name);
  } else {
    mg_printf(conn, "Bad SSI #include: [%s]", tag);
    return;
  }

  if ((fp = fopen(path, "rb")) == NULL) {
    mg_printf(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
              tag, path, strerror(errno));
  } else {
    ns_set_close_on_exec(fileno(fp));
    if (mg_match_prefix(opts[SSI_PATTERN], strlen(opts[SSI_PATTERN]),
        path) > 0) {
      send_ssi_file(conn, path, fp, include_level + 1);
    } else {
      send_file_data(conn, fp);
    }
    fclose(fp);
  }
}

#ifndef MONGOOSE_NO_POPEN
static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  char cmd[IOBUF_SIZE];
  FILE *fp;

  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
    mg_printf(conn, "Bad SSI #exec: [%s]", tag);
  } else if ((fp = popen(cmd, "r")) == NULL) {
    mg_printf(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(errno));
  } else {
    send_file_data(conn, fp);
    pclose(fp);
  }
}
#endif // !MONGOOSE_NO_POPEN

static void send_ssi_file(struct mg_connection *conn, const char *path,
                          FILE *fp, int include_level) {
  char buf[IOBUF_SIZE];
  int ch, offset, len, in_ssi_tag;

  if (include_level > 10) {
    mg_printf(conn, "SSI #include level is too deep (%s)", path);
    return;
  }

  in_ssi_tag = len = offset = 0;
  while ((ch = fgetc(fp)) != EOF) {
    if (in_ssi_tag && ch == '>') {
      in_ssi_tag = 0;
      buf[len++] = (char) ch;
      buf[len] = '\0';
      assert(len <= (int) sizeof(buf));
      if (len < 6 || memcmp(buf, "
NameModifiedSize