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Merge pull request #789 from llmII/feature-bind-connect

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Add bind option to net/connect
This commit is contained in:
Calvin Rose 2021-09-07 18:47:17 -05:00 committed by GitHub
commit d8f6fbf594
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 59 additions and 14 deletions
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73
src/core/net.c
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@ -259,8 +259,9 @@ static int janet_get_sockettype(Janet *argv, int32_t argc, int32_t n) {
}
/* Needs argc >= offset + 2 */
/* For unix paths, just rertuns a single sockaddr and sets *is_unix to 1, otherwise 0 */
static struct addrinfo *janet_get_addrinfo(Janet *argv, int32_t offset, int socktype, int passive, int *is_unix) {
/* For unix paths, just rertuns a single sockaddr and sets *is_unix to 1,
* otherwise 0. Also, ignores is_bind when is a unix socket. */
static struct addrinfo *janet_get_addrinfo(Janet *argv, int32_t offset, int socktype, int passive, int *is_unix, int is_bind) {
/* Unix socket support - not yet supported on windows. */
#ifndef JANET_WINDOWS
if (janet_keyeq(argv[offset], "unix")) {
@ -285,12 +286,24 @@ static struct addrinfo *janet_get_addrinfo(Janet *argv, int32_t offset, int sock
}
#endif
/* Get host and port */
const char *host = janet_getcstring(argv, offset);
const char *port;
if (janet_checkint(argv[offset + 1])) {
port = (const char *)janet_to_string(argv[offset + 1]);
char *host = NULL, *port = NULL;
char *err = NULL;
/* if is_bind is set, skip offsets and ports! */
if (!is_bind) {
host = (char *)janet_getcstring(argv, offset);
if (janet_checkint(argv[offset + 1])) {
port = (char *)janet_to_string(argv[offset + 1]);
} else {
port = (char *)janet_optcstring(argv, offset + 2, offset + 1, NULL);
}
err = "could not get address info: %s";
} else {
port = janet_optcstring(argv, offset + 2, offset + 1, NULL);
/* when is_bind is set, we're performing a connect, but wanting to
* specify from where we connect, and in general don't care about a
* port */
host = (char *)janet_getcstring(argv, 3);
port = NULL;
err = "could not get address info for connect bind: %s";
}
/* getaddrinfo */
struct addrinfo *ai = NULL;
@ -301,7 +314,7 @@ static struct addrinfo *janet_get_addrinfo(Janet *argv, int32_t offset, int sock
hints.ai_flags = passive ? AI_PASSIVE : 0;
int status = getaddrinfo(host, port, &hints, &ai);
if (status) {
janet_panicf("could not get address info: %s", gai_strerror(status));
janet_panicf(err, gai_strerror(status));
}
*is_unix = 0;
return ai;
@ -322,7 +335,7 @@ JANET_CORE_FN(cfun_net_sockaddr,
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
int make_arr = (argc >= 3 && janet_truthy(argv[3]));
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix);
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix, 0);
#ifndef JANET_WINDOWS
/* no unix domain socket support on windows yet */
if (is_unix) {
@ -357,15 +370,25 @@ JANET_CORE_FN(cfun_net_sockaddr,
}
JANET_CORE_FN(cfun_net_connect,
"(net/connect host port &opt type)",
"(net/connect host port &opt type bindhost)",
"Open a connection to communicate with a server. Returns a duplex stream "
"that can be used to communicate with the server. Type is an optional keyword "
"to specify a connection type, either :stream or :datagram. The default is :stream. ") {
janet_arity(argc, 2, 3);
"to specify a connection type, either :stream or :datagram. The default is :stream. "
"Bindhost is an optional string to select from what address to make the outgoing "
"connection, with the default being the same as using the OS's preferred address. ") {
janet_arity(argc, 2, 4);
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix);
/* Where we're connecting to */
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix, 0);
/* Check if we're binding address */
struct addrinfo *binding = NULL;
if (argc > 3 && is_unix == 0 && !janet_checktype(argv[3], JANET_NIL)) {
int is_bindhost_unix = 0; /* discarded value */
binding = janet_get_addrinfo(argv, 0, socktype, 0, &is_bindhost_unix, 1);
}
/* Create socket */
JSock sock = JSOCKDEFAULT;
@ -401,6 +424,28 @@ JANET_CORE_FN(cfun_net_connect,
}
}
/* Perform bind if binding */
if (binding != NULL) {
/* Check all addrinfos in a loop for the first that we can bind to. */
struct addrinfo *rp = NULL;
for (rp = binding; rp != NULL; rp = rp->ai_next) {
#ifdef JANET_WINDOWS
sock = WSASocketW(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol, NULL, 0, WSA_FLAG_OVERLAPPED);
#else
sock = socket(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol);
#endif
if (!JSOCKVALID(sock)) continue;
/* Bind */
if (bind(sock, rp->ai_addr, (int) rp->ai_addrlen) == 0) break;
JSOCKCLOSE(sock);
}
freeaddrinfo(binding);
if (NULL == rp) {
janet_panicf("could not bind outgoing address: %V", janet_ev_lasterr());
}
}
/* Connect to socket */
#ifdef JANET_WINDOWS
int status = WSAConnect(sock, addr, addrlen, NULL, NULL, NULL, NULL);
@ -502,7 +547,7 @@ JANET_CORE_FN(cfun_net_listen,
/* Get host, port, and handler*/
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 1, &is_unix);
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 1, &is_unix, 0);
JSock sfd = JSOCKDEFAULT;
#ifndef JANET_WINDOWS