ympd/src/ympd.c

/* ympd
   (c) 2013-2014 Andrew Karpow <andy@ympd.org>
   This project's homepage is: http://www.ympd.org

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <libwebsockets.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/time.h>

#include "http_server.h"
#include "mpd_client.h"
#include "config.h"

extern char *optarg;
extern char *resource_path;

struct libwebsocket_protocols protocols[] = {
    /* first protocol must always be HTTP handler */
    {
        "http-only",		/* name */
        callback_http,		/* callback */
        sizeof (struct per_session_data__http),	/* per_session_data_size */
        0,			/* max frame size / rx buffer */
    },
    {
        "ympd-client",
        callback_ympd,
        sizeof(struct per_session_data__ympd),
        255,
        0,
    },

    { NULL, NULL, 0, 0, 0 } /* terminator */
};

int force_exit = 0;

void bye()
{
    force_exit = 1;
}

int main(int argc, char **argv)
{
    int n, gid = -1, uid = -1;
    int option_index = 0;
    unsigned int oldus = 0;
    struct libwebsocket_context *context;
    struct lws_context_creation_info info;
    const char *cert_filepath = NULL;
    const char *private_key_filepath = NULL;
    const char *iface = NULL;

    atexit(bye);
    memset(&info, 0, sizeof info);
    info.port = 8080;
    mpd_host = "127.0.0.1";
    mpd_port = 6600;
    lws_set_log_level(LLL_ERR | LLL_WARN, NULL);

    static struct option long_options[] = {
        {"host",         required_argument, 0, 'h'},
        {"port",         required_argument, 0, 'p'},
        {"interface",    required_argument, 0, 'i'},
        {"webport",      required_argument, 0, 'w'},
        {"resourcepath", required_argument, 0, 'r'},
        {"ssl_cert",     required_argument, 0, 'c'},
        {"ssl_key",      required_argument, 0, 'k'},
        {"gid",          required_argument, 0, 'g'},
        {"uid",          required_argument, 0, 'u'},
        {"verbose",      optional_argument, 0, 'v'},
        {"version",      no_argument,       0, 'V'},
        {"help",         no_argument,       0,  0 },
        {0,              0,                 0,  0 }
    };

    while((n = getopt_long(argc, argv, "h:p:i:w:r:c:k:g:u:v::V",
                long_options, &option_index)) != -1) {
        switch (n) {
            case 'h':
                mpd_host = optarg;
                break;
            case 'p':
                mpd_port = atoi(optarg);
            case 'i':
                iface = optarg;
                break;
            case 'w':
                info.port = atoi(optarg);
                break;
            case 'r':
                resource_path = optarg;
                break;
            case 'c':
                cert_filepath = optarg;
                break;
            case 'k':
                private_key_filepath = optarg;
                break;
            case 'g':
                gid = atoi(optarg);
                break;
            case 'u':
                uid = atoi(optarg);
                break;
            case 'v':
                if(optarg)
                    lws_set_log_level(strtol(optarg, NULL, 10), NULL);
                else
                    lws_set_log_level(LLL_ERR | LLL_WARN | 
                            LLL_NOTICE | LLL_INFO, NULL);
                break;
            case 'V':
                fprintf(stdout, "ympd  %d.%d.%d\n"
                        "Copyright (C) 2014 Andrew Karpow <andy@ympd.org>\n"
                        "Resource Path: "LOCAL_RESOURCE_PATH"\n"
                        "built " __DATE__ " "__TIME__ " ("__VERSION__")\n",
                        YMPD_VERSION_MAJOR, YMPD_VERSION_MINOR, YMPD_VERSION_PATCH);
                return EXIT_SUCCESS;
                break;
            default:
                fprintf(stderr, "Usage: %s [OPTION]...\n\n"
                        "\t-h, --host <host>\t\tconnect to mpd at host [localhost]\n"
                        "\t-p, --port <port>\t\tconnect to mpd at port [6600]\n"
                        "\t-i, --interface <interface>\tlisten interface for webserver [all]\n"
                        "\t-w, --webport <port>\t\tlisten port for webserver [8080]\n"
                        "\t-r, --resourcepath <path>\tresourcepath for webserver [" LOCAL_RESOURCE_PATH "]\n"
                        "\t-c, --ssl_cert <filepath>\tssl certificate ssl_private_key_filepath\n"
                        "\t-k, --ssl_key <filepath>\tssl private key filepath\n"
                        "\t-u, --uid <id>\t\t\tuser-id after socket bind\n"
                        "\t-g, --gid <id>\t\t\tgroup-id after socket bind\n"
                        "\t-v, --verbose[<level>]\t\tverbosity level\n" 
                        "\t-V, --version\t\t\tget version\n"
                        "\t--help\t\t\t\tthis help\n"
                        , argv[0]);
                return EXIT_FAILURE;
        }
    }

    if(cert_filepath != NULL && private_key_filepath == NULL) {
        lwsl_err("private key filepath needed\n");
        return EXIT_FAILURE;
    }

    if(private_key_filepath != NULL && cert_filepath == NULL) {
        lwsl_err("public cert filepath needed\n");
        return EXIT_FAILURE;
    }

    info.ssl_cert_filepath = cert_filepath;
    info.ssl_private_key_filepath = private_key_filepath;
    info.iface = iface;
    info.protocols = protocols;
    info.extensions = libwebsocket_get_internal_extensions();
    info.gid = gid;
    info.uid = uid;
    info.options = 0;

    context = libwebsocket_create_context(&info);
    if (context == NULL) {
        lwsl_err("libwebsocket init failed\n");
        return EXIT_FAILURE;
    }

    n = 0;
    while (n >= 0 && !force_exit) {
        struct timeval tv;

        gettimeofday(&tv, NULL);

        /*
         * This provokes the LWS_CALLBACK_SERVER_WRITEABLE for every
         * live websocket connection using the DUMB_INCREMENT protocol,
         * as soon as it can take more packets (usually immediately)
         */

        if (((unsigned int)tv.tv_usec - oldus) > 1000 * 500) {
            mpd_loop();
            libwebsocket_callback_on_writable_all_protocol(&protocols[1]);
            oldus = tv.tv_usec;
        }

        n = libwebsocket_service(context, 50);
    }

    libwebsocket_context_destroy(context);
    return 0;
}