connection.c 31.8 KB
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/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

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/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
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#ifndef _WIN32
#include <sys/time.h>
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#include <sys/socket.h>
#include <netinet/in.h>
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#else
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#include <winsock2.h>
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#define snprintf _snprintf
#define strcasecmp stricmp
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#define strncasecmp strnicmp
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#endif
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#include "os.h"

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#include "thread/thread.h"
#include "avl/avl.h"
#include "net/sock.h"
#include "httpp/httpp.h"
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#include "cfgfile.h"
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#include "global.h"
#include "util.h"
#include "connection.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
#include "logging.h"
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#include "xslt.h"
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#include "fserve.h"
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#include "sighandler.h"
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#include "yp.h"
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#include "source.h"
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#include "format.h"
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#include "format_mp3.h"
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#include "event.h"
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#include "admin.h"
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#include "auth.h"
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#define CATMODULE "connection"

typedef struct con_queue_tag {
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    connection_t *con;
    struct con_queue_tag *next;
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} con_queue_t;

typedef struct _thread_queue_tag {
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    thread_type *thread_id;
    struct _thread_queue_tag *next;
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} thread_queue_t;

static mutex_t _connection_mutex;
static unsigned long _current_id = 0;
static int _initialized = 0;
static cond_t _pool_cond;

static con_queue_t *_queue = NULL;
static mutex_t _queue_mutex;

static thread_queue_t *_conhands = NULL;

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rwlock_t _source_shutdown_rwlock;
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static void *_handle_connection(void *arg);

void connection_initialize(void)
{
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    if (_initialized) return;
    
    thread_mutex_create(&_connection_mutex);
    thread_mutex_create(&_queue_mutex);
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    thread_mutex_create(&move_clients_mutex);
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    thread_rwlock_create(&_source_shutdown_rwlock);
    thread_cond_create(&_pool_cond);
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    thread_cond_create(&global.shutdown_cond);
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    _initialized = 1;
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}

void connection_shutdown(void)
{
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    if (!_initialized) return;
    
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    thread_cond_destroy(&global.shutdown_cond);
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    thread_cond_destroy(&_pool_cond);
    thread_rwlock_destroy(&_source_shutdown_rwlock);
    thread_mutex_destroy(&_queue_mutex);
    thread_mutex_destroy(&_connection_mutex);
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    thread_mutex_destroy(&move_clients_mutex);
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    _initialized = 0;
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}

static unsigned long _next_connection_id(void)
{
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    unsigned long id;
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    thread_mutex_lock(&_connection_mutex);
    id = _current_id++;
    thread_mutex_unlock(&_connection_mutex);
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    return id;
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}

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connection_t *create_connection(sock_t sock, sock_t serversock, char *ip) {
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    connection_t *con;
    con = (connection_t *)malloc(sizeof(connection_t));
    memset(con, 0, sizeof(connection_t));
    con->sock = sock;
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    con->serversock = serversock;
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    con->con_time = time(NULL);
    con->id = _next_connection_id();
    con->ip = ip;
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    con->event_number = EVENT_NO_EVENT;
    con->event = NULL;

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    return con;
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}

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static int wait_for_serversock(int timeout)
{
#ifdef HAVE_POLL
    struct pollfd ufds[MAX_LISTEN_SOCKETS];
    int i, ret;

    for(i=0; i < global.server_sockets; i++) {
        ufds[i].fd = global.serversock[i];
        ufds[i].events = POLLIN;
        ufds[i].revents = 0;
    }

    ret = poll(ufds, global.server_sockets, timeout);
    if(ret < 0) {
        return -2;
    }
    else if(ret == 0) {
        return -1;
    }
    else {
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        int dst;
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        for(i=0; i < global.server_sockets; i++) {
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            if(ufds[i].revents & POLLIN)
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                return ufds[i].fd;
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            if(ufds[i].revents & (POLLHUP|POLLERR|POLLNVAL))
            {
                if (ufds[i].revents & (POLLHUP|POLLERR))
                {
                    close (global.serversock[i]);
                    WARN0("Had to close a listening socket");
                }
                global.serversock[i] = -1;
            }
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        }
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        /* remove any closed sockets */
        for(i=0, dst=0; i < global.server_sockets; i++)
        {
            if (global.serversock[i] == -1)
                continue;
            if (i!=dst)
                global.serversock[dst] = global.serversock[i];
            dst++;
        }
        global.server_sockets = dst;
        return -1;
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    }
#else
    fd_set rfds;
    struct timeval tv, *p=NULL;
    int i, ret;
    int max = -1;

    FD_ZERO(&rfds);

    for(i=0; i < global.server_sockets; i++) {
        FD_SET(global.serversock[i], &rfds);
        if(global.serversock[i] > max)
            max = global.serversock[i];
    }

    if(timeout >= 0) {
        tv.tv_sec = timeout/1000;
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        tv.tv_usec = (timeout % 1000) * 1000;
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        p = &tv;
    }

    ret = select(max+1, &rfds, NULL, NULL, p);
    if(ret < 0) {
        return -2;
    }
    else if(ret == 0) {
        return -1;
    }
    else {
        for(i=0; i < global.server_sockets; i++) {
            if(FD_ISSET(global.serversock[i], &rfds))
                return global.serversock[i];
        }
        return -1; /* Should be impossible, stop compiler warnings */
    }
#endif
}

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static connection_t *_accept_connection(void)
{
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    int sock;
    connection_t *con;
    char *ip;
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    int serversock; 
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    serversock = wait_for_serversock(100);
    if(serversock < 0)
        return NULL;
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    /* malloc enough room for a full IP address (including ipv6) */
    ip = (char *)malloc(MAX_ADDR_LEN);
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    sock = sock_accept(serversock, ip, MAX_ADDR_LEN);
    if (sock >= 0) {
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        con = create_connection(sock, serversock, ip);
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        return con;
    }
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    if (!sock_recoverable(sock_error()))
        WARN2("accept() failed with error %d: %s", sock_error(), strerror(sock_error()));
    
    free(ip);
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    return NULL;
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}

static void _add_connection(connection_t *con)
{
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    con_queue_t *node;
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    node = (con_queue_t *)malloc(sizeof(con_queue_t));
    
    thread_mutex_lock(&_queue_mutex);
    node->con = con;
    node->next = _queue;
    _queue = node;
    thread_mutex_unlock(&_queue_mutex);
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}

static void _signal_pool(void)
{
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    thread_cond_signal(&_pool_cond);
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}

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static void _push_thread(thread_queue_t **queue, thread_type *thread_id)
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{
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    /* create item */
    thread_queue_t *item = (thread_queue_t *)malloc(sizeof(thread_queue_t));
    item->thread_id = thread_id;
    item->next = NULL;


    thread_mutex_lock(&_queue_mutex);
    if (*queue == NULL) {
        *queue = item;
    } else {
        item->next = *queue;
        *queue = item;
    }
    thread_mutex_unlock(&_queue_mutex);
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}

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static thread_type *_pop_thread(thread_queue_t **queue)
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{
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    thread_type *id;
    thread_queue_t *item;
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    thread_mutex_lock(&_queue_mutex);
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    item = *queue;
    if (item == NULL) {
        thread_mutex_unlock(&_queue_mutex);
        return NULL;
    }
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    *queue = item->next;
    item->next = NULL;
    id = item->thread_id;
    free(item);
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    thread_mutex_unlock(&_queue_mutex);
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    return id;
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}

static void _build_pool(void)
{
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    ice_config_t *config;
    int i;
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    thread_type *tid;
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    char buff[64];
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    int threadpool_size;
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    config = config_get_config();
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    threadpool_size = config->threadpool_size;
    config_release_config();
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    for (i = 0; i < threadpool_size; i++) {
        snprintf(buff, 64, "Connection Thread #%d", i);
        tid = thread_create(buff, _handle_connection, NULL, THREAD_ATTACHED);
        _push_thread(&_conhands, tid);
    }
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}

static void _destroy_pool(void)
{
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    thread_type *id;
    int i;

    i = 0;

    thread_cond_broadcast(&_pool_cond);
    id = _pop_thread(&_conhands);
    while (id != NULL) {
        thread_join(id);
        _signal_pool();
        id = _pop_thread(&_conhands);
    }
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}

void connection_accept_loop(void)
{
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    connection_t *con;
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    _build_pool();
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    while (global.running == ICE_RUNNING)
    {
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        if (global . schedule_config_reread)
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        {
            /* reread config file */
            INFO0("Scheduling config reread ...");

            connection_inject_event(EVENT_CONFIG_READ, NULL);
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            global . schedule_config_reread = 0;
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        }

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        con = _accept_connection();
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        if (con) {
            _add_connection(con);
            _signal_pool();
        }
    }
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    /* Give all the other threads notification to shut down */
    thread_cond_broadcast(&global.shutdown_cond);

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    _destroy_pool();
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    /* wait for all the sources to shutdown */
    thread_rwlock_wlock(&_source_shutdown_rwlock);
    thread_rwlock_unlock(&_source_shutdown_rwlock);
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}

static connection_t *_get_connection(void)
{
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    con_queue_t *node = NULL;
    con_queue_t *oldnode = NULL;
    connection_t *con = NULL;

    thread_mutex_lock(&_queue_mutex);
    if (_queue) {
        node = _queue;
        while (node->next) {
            oldnode = node;
            node = node->next;
        }
        
        /* node is now the last node
        ** and oldnode is the previous one, or NULL
        */
        if (oldnode) oldnode->next = NULL;
        else (_queue) = NULL;
    }
    thread_mutex_unlock(&_queue_mutex);

    if (node) {
        con = node->con;
        free(node);
    }

    return con;
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}

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void connection_inject_event(int eventnum, void *event_data) {
    connection_t *con = calloc(1, sizeof(connection_t));

    con->event_number = eventnum;
    con->event = event_data;

    _add_connection(con);
    _signal_pool();
}

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/* Called when activating a source. Verifies that the source count is not
 * exceeded and applies any initial parameters.
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 */
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int connection_complete_source (source_t *source)
{
    ice_config_t *config = config_get_config();

    global_lock ();
    DEBUG1 ("sources count is %d", global.sources);

    if (global.sources < config->source_limit)
    {
        char *contenttype;
        mount_proxy *mountproxy = config->mounts;
        format_type_t format_type;

        /* setup format handler */
        contenttype = httpp_getvar (source->parser, "content-type");
        if (contenttype != NULL)
        {
            format_type = format_get_type (contenttype);

            if (format_type == FORMAT_ERROR)
            {
                global_unlock();
                config_release_config();
                if (source->client)
                    client_send_404 (source->client, "Content-type not supported");
                WARN1("Content-type \"%s\" not supported, dropping source", contenttype);
                return -1;
            }
        }
        else
        {
            WARN0("No content-type header, falling back to backwards compatibility mode"
                    "for icecast 1.x relays. Assuming content is mp3.");
            format_type = FORMAT_TYPE_MP3;
        }
        source->format = format_get_plugin (format_type, source->mount, source->parser);

        if (source->format == NULL)
        {
            global_unlock();
            config_release_config();
            if (source->client)
                client_send_404 (source->client, "internal format allocation problem");
            WARN1 ("plugin format failed for \"%s\"", source->mount);
            return -1;
        }

        global.sources++;
        global_unlock();

        /* for relays, we don't yet have a client, however we do require one
         * to retrieve the stream from.  This is created here, quite late,
         * because we can't use this client to return an error code/message,
         * so we only do this once we know we're going to accept the source.
         */
        if (source->client == NULL)
            source->client = client_create (source->con, source->parser);

        sock_set_blocking (source->con->sock, SOCK_NONBLOCK);

        while (mountproxy)
        {
            if (strcmp (mountproxy->mountname, source->mount) == 0)
            {
                source_apply_mount (source, mountproxy);
                break;
            }
            mountproxy = mountproxy->next;
        }
        config_release_config();

        source->shutdown_rwlock = &_source_shutdown_rwlock;
        DEBUG0 ("source is ready to start");

        return 0;
    }
    WARN1("Request to add source when maximum source limit"
            "reached %d", global.sources);

    global_unlock();
    config_release_config();

    if (source->client)
        client_send_404 (source->client, "too many sources connected");

    return -1;
}


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int connection_create_source(client_t *client, connection_t *con, http_parser_t *parser, char *mount) {
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    source_t *source;
    char *contenttype;
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    mount_proxy *mountproxy, *mountinfo = NULL;
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    int source_limit;
    ice_config_t *config;

    config = config_get_config();
    source_limit = config->source_limit;
    config_release_config();
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    /* check to make sure this source wouldn't
    ** be over the limit
    */
    global_lock();
    if (global.sources >= source_limit) {
        INFO1("Source (%s) logged in, but there are too many sources", mount);
        global_unlock();
        return 0;
    }
    global.sources++;
    global_unlock();

    stats_event_inc(NULL, "sources");
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    config = config_get_config();
    mountproxy = config->mounts;
    thread_mutex_lock(&(config_locks()->mounts_lock));

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    while(mountproxy) {
        if(!strcmp(mountproxy->mountname, mount)) {
            mountinfo = mountproxy;
            break;
        }
        mountproxy = mountproxy->next;
    }
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    contenttype = httpp_getvar(parser, "content-type");
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    if (contenttype != NULL) {
        format_type_t format = format_get_type(contenttype);
        if (format == FORMAT_ERROR) {
            WARN1("Content-type \"%s\" not supported, dropping source", contenttype);
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            thread_mutex_unlock(&(config_locks()->mounts_lock));
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            config_release_config();
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            goto fail;
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        } else {
            source = source_create(client, con, parser, mount, 
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                    format, mountinfo);
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            thread_mutex_unlock(&(config_locks()->mounts_lock));
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        }
    } else {
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        format_type_t format = FORMAT_TYPE_MP3;
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        ERROR0("No content-type header, falling back to backwards compatibility mode for icecast 1.x relays. Assuming content is mp3.");
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        source = source_create(client, con, parser, mount, format, mountinfo);
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        thread_mutex_unlock(&(config_locks()->mounts_lock));
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    }
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    config_release_config();
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    source->send_return = 1;
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    source->shutdown_rwlock = &_source_shutdown_rwlock;
    sock_set_blocking(con->sock, SOCK_NONBLOCK);
    thread_create("Source Thread", source_main, (void *)source, THREAD_DETACHED);
    return 1;
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fail:
    global_lock();
    global.sources--;
    global_unlock();

    stats_event_dec(NULL, "sources");
    return 0;
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}

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static int _check_pass_http(http_parser_t *parser, 
        char *correctuser, char *correctpass)
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{
    /* This will look something like "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" */
    char *header = httpp_getvar(parser, "authorization");
    char *userpass, *tmp;
    char *username, *password;

    if(header == NULL)
        return 0;

    if(strncmp(header, "Basic ", 6))
        return 0;

    userpass = util_base64_decode(header+6);
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    if(userpass == NULL) {
        WARN1("Base64 decode of Authorization header \"%s\" failed",
                header+6);
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        return 0;
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    }
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    tmp = strchr(userpass, ':');
    if(!tmp) {
        free(userpass);
        return 0;
    }
    *tmp = 0;
    username = userpass;
    password = tmp+1;

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    if(strcmp(username, correctuser) || strcmp(password, correctpass)) {
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        free(userpass);
        return 0;
    }
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    free(userpass);
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    return 1;
}

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static int _check_pass_icy(http_parser_t *parser, char *correctpass)
{
    char *password;

    password = httpp_getvar(parser, HTTPP_VAR_ICYPASSWORD);
    if(!password)
        return 0;

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    if (strcmp(password, correctpass))
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        return 0;
    else
        return 1;
}

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static int _check_pass_ice(http_parser_t *parser, char *correctpass)
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{
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    char *password;
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    password = httpp_getvar(parser, "ice-password");
    if(!password)
        password = "";

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    if (strcmp(password, correctpass))
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        return 0;
    else
        return 1;
}

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int connection_check_admin_pass(http_parser_t *parser)
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{
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    int ret;
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    ice_config_t *config = config_get_config();
    char *pass = config->admin_password;
    char *user = config->admin_username;
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    if(!pass || !user) {
        config_release_config();
        return 0;
    }

    ret = _check_pass_http(parser, user, pass);
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    config_release_config();
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    return ret;
}
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int connection_check_relay_pass(http_parser_t *parser)
{
    int ret;
    ice_config_t *config = config_get_config();
    char *pass = config->relay_password;
    char *user = "relay";
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    if(!pass || !user) {
        config_release_config();
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        return 0;
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    }
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    ret = _check_pass_http(parser, user, pass);
    config_release_config();
    return ret;
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}

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int connection_check_source_pass(http_parser_t *parser, char *mount)
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{
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    ice_config_t *config = config_get_config();
    char *pass = config->source_password;
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    char *user = "source";
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    int ret;
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    int ice_login = config->ice_login;
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    char *protocol;
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    mount_proxy *mountinfo = config->mounts;
    thread_mutex_lock(&(config_locks()->mounts_lock));
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    while(mountinfo) {
        if(!strcmp(mountinfo->mountname, mount)) {
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            if(mountinfo->password)
                pass = mountinfo->password;
            if(mountinfo->username)
                user = mountinfo->username;
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            break;
        }
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        mountinfo = mountinfo->next;
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    }

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    thread_mutex_unlock(&(config_locks()->mounts_lock));

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    if(!pass) {
        WARN0("No source password set, rejecting source");
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        config_release_config();
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        return 0;
    }

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    protocol = httpp_getvar(parser, HTTPP_VAR_PROTOCOL);
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    if(protocol != NULL && !strcmp(protocol, "ICY")) {
        ret = _check_pass_icy(parser, pass);
    }
    else {
        ret = _check_pass_http(parser, user, pass);
        if(!ret && ice_login)
        {
            ret = _check_pass_ice(parser, pass);
            if(ret)
                WARN0("Source is using deprecated icecast login");
        }
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    }
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    config_release_config();
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    return ret;
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}

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static void _handle_source_request(connection_t *con, 
        http_parser_t *parser, char *uri)
{
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    client_t *client;

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    client = client_create(con, parser);
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    INFO1("Source logging in at mountpoint \"%s\"", uri);
    stats_event_inc(NULL, "source_connections");
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    if (!connection_check_source_pass(parser, uri)) {
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        /* We commonly get this if the source client is using the wrong
         * protocol: attempt to diagnose this and return an error
         */
        /* TODO: Do what the above comment says */
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        INFO1("Source (%s) attempted to login with invalid or missing password", uri);
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        client_send_401(client);
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        return;
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    }
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    /* check to make sure this source has
    ** a unique mountpoint
    */
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    avl_tree_rlock(global.source_tree);
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    if (source_find_mount_raw(uri) != NULL) {
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        avl_tree_unlock(global.source_tree);
        INFO1("Source tried to log in as %s, but mountpoint is already used", uri);
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        client_send_404(client, "Mountpoint in use");
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        return;
    }
    avl_tree_unlock(global.source_tree);
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    if (!connection_create_source(client, con, parser, uri)) {
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        client_send_404(client, "Mountpoint in use");
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    }
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}

static void _handle_stats_request(connection_t *con, 
        http_parser_t *parser, char *uri)
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{
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    stats_connection_t *stats;
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    stats_event_inc(NULL, "stats_connections");
                
    if (!connection_check_admin_pass(parser)) {
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        ERROR0("Bad password for stats connection");
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        connection_close(con);
        httpp_destroy(parser);
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        return;
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    }
                    
    stats_event_inc(NULL, "stats");
                    
    /* create stats connection and create stats handler thread */
    stats = (stats_connection_t *)malloc(sizeof(stats_connection_t));
    stats->parser = parser;
    stats->con = con;
                    
    thread_create("Stats Connection", stats_connection, (void *)stats, THREAD_DETACHED);
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}

static void _handle_get_request(connection_t *con,
        http_parser_t *parser, char *uri)
{
    char *fullpath;
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    client_t *client;
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    int bytes;
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    struct stat statbuf;
    source_t *source;
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    int fileserve;
    char *host;
    int port;
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    int i;
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    char *serverhost = NULL;
    int serverport = 0;
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    aliases *alias;
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    ice_config_t *config;
    int client_limit;

    config = config_get_config();
    fileserve = config->fileserve;
    host = config->hostname;
    port = config->port;
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    for(i = 0; i < MAX_LISTEN_SOCKETS; i++) {
        if(global.serversock[i] == con->serversock) {
            serverhost = config->listeners[i].bind_address;
            serverport = config->listeners[i].port;
            break;
        }
    }
    alias = config->aliases;
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    client_limit = config->client_limit;
    config_release_config();

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    DEBUG0("Client connected");

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    /* make a client */
    client = client_create(con, parser);
    stats_event_inc(NULL, "client_connections");
                    
    /* there are several types of HTTP GET clients
    ** media clients, which are looking for a source (eg, URI = /stream.ogg)
    ** stats clients, which are looking for /admin/stats.xml
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    ** and directory server authorizers, which are looking for /GUID-xxxxxxxx 
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    ** (where xxxxxx is the GUID in question) - this isn't implemented yet.
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    ** we need to handle the latter two before the former, as the latter two
    ** aren't subject to the limits.
    */
    /* TODO: add GUID-xxxxxx */
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    /* Handle aliases */
    while(alias) {
        if(strcmp(uri, alias->source) == 0 && (alias->port == -1 || alias->port == serverport) && (alias->bind_address == NULL || (serverhost != NULL && strcmp(alias->bind_address, serverhost) == 0))) {
            uri = alias->destination;
            break;
        }
        alias = alias->next;
    }

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    /* Dispatch all admin requests */
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    if (strncmp(uri, "/admin/", 7) == 0) {
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        admin_handle_request(client, uri);
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        return;
    }

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    /* Here we are parsing the URI request to see
    ** if the extension is .xsl, if so, then process
    ** this request as an XSLT request
    */
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    fullpath = util_get_path_from_normalised_uri(uri);
    if (util_check_valid_extension(fullpath) == XSLT_CONTENT) {
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        /* If the file exists, then transform it, otherwise, write a 404 */
        if (stat(fullpath, &statbuf) == 0) {
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            DEBUG0("Stats request, sending XSL transformed stats");
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            client->respcode = 200;
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            bytes = sock_write(client->con->sock, 
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                    "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n");
            if(bytes > 0) client->con->sent_bytes = bytes;
            stats_transform_xslt(client, fullpath);
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            client_destroy(client);
        }
        else {
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            client_send_404(client, "The file you requested could not be found");
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        }
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        free(fullpath);
        return;
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    }
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    else if(fileserve && stat(fullpath, &statbuf) == 0 && 
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#ifdef _WIN32
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            ((statbuf.st_mode) & _S_IFREG))
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#else
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            S_ISREG(statbuf.st_mode)) 
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#endif
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    {
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        fserve_client_create(client, fullpath);
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        free(fullpath);
        return;
    }
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    free(fullpath);

    if(strcmp(util_get_extension(uri), "m3u") == 0) {
        char *sourceuri = strdup(uri);
        char *dot = strrchr(sourceuri, '.');
        *dot = 0;
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        avl_tree_rlock(global.source_tree);
        source = source_find_mount(sourceuri);
           if (source) {
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            client->respcode = 200;
            bytes = sock_write(client->con->sock,
                    "HTTP/1.0 200 OK\r\n"
                    "Content-Type: audio/x-mpegurl\r\n\r\n"
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                    "http://%s:%d%s\r\n", 
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                    host, 
                    port,
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                    sourceuri
                    );
            if(bytes > 0) client->con->sent_bytes = bytes;
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            client_destroy(client);
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        }
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        else if(fileserve) {
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            fullpath = util_get_path_from_normalised_uri(sourceuri);
            if(stat(fullpath, &statbuf) == 0) {
                fserve_client_create(client, fullpath);
                free(fullpath);
            }
            else {
                free(fullpath);
                fullpath = util_get_path_from_normalised_uri(uri);
                if(stat(fullpath, &statbuf) == 0) {
                    fserve_client_create(client, fullpath);
                    free(fullpath);
                }
                else {
                    free(fullpath);
                    client_send_404(client, 
                            "The file you requested could not be found");
                }
            }
        }
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        else {
            client_send_404(client, "The file you requested could not be found");
        }
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        avl_tree_unlock(global.source_tree);
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        free(sourceuri);
        return;
    }

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    global_lock();
    if (global.clients >= client_limit) {
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        client_send_504(client,
                "The server is already full. Try again later.");
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        global_unlock();
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        return;
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    }
    global_unlock();
                    
    avl_tree_rlock(global.source_tree);
    source = source_find_mount(uri);
    if (source) {
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        DEBUG0("Source found for client");
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        /* The source may not be the requested source - it might have gone
         * via one or more fallbacks. We only reject it for no-mount if it's
         * the originally requested source
         */
        if(strcmp(uri, source->mount) == 0 && source->no_mount) {
            client_send_404(client, "This mount is unavailable.");
            avl_tree_unlock(global.source_tree);
            return;
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        }
        if (source->running == 0)
        {
            avl_tree_unlock(global.source_tree);
            DEBUG0("inactive source, client dropped");
            client_send_404(client, "This mount is unavailable.");
            return;
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        }

        /* Check for any required authentication first */
        if(source->authenticator != NULL) {
            if(auth_check_client(source, client) != AUTH_OK) {
                INFO1("Client attempted to log in to source (\"%s\")with "
                        "incorrect or missing password", uri);
                client_send_401(client);
                avl_tree_unlock(global.source_tree);
                return;
            }
        }

        /* And then check that there's actually room in the server... */
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        global_lock();
        if (global.clients >= client_limit) {
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            client_send_504(client, 
                    "The server is already full. Try again later.");
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            global_unlock();
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            avl_tree_unlock(global.source_tree);
            return;
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        }
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        /* Early-out for per-source max listeners. This gets checked again
         * by the source itself, later. This route gives a useful message to
         * the client, also.
         */
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        else if(source->max_listeners != -1 && 
                source->listeners >= source->max_listeners) 
        {
            client_send_504(client, 
                    "Too many clients on this mountpoint. Try again later.");
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            global_unlock();
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            avl_tree_unlock(global.source_tree);
            return;
        }
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        global.clients++;
        global_unlock();
                        
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        client->format_data = source->format->create_client_data(
                source->format, source, client);

        source->format->client_send_headers(source->format, source, client);
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        bytes = sock_write(client->con->sock, "\r\n");
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        if(bytes > 0) client->con->sent_bytes += bytes;
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        sock_set_blocking(client->con->sock, SOCK_NONBLOCK);
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        sock_set_nodelay(client->con->sock);
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        avl_tree_wlock(source->pending_tree);
        avl_insert(source->pending_tree, (void *)client);
        avl_tree_unlock(source->pending_tree);
    }
                    
    avl_tree_unlock(global.source_tree);
                    
    if (!source) {
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        DEBUG0("Source not found for client");
        client_send_404(client, "The source you requested could not be found.");
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    }
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}

static void *_handle_connection(void *arg)
{
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    char header[4096];
    connection_t *con;
    http_parser_t *parser;
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    char *rawuri, *uri;
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    client_t *client;
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    while (global.running == ICE_RUNNING) {
        memset(header, 0, 4096);
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        thread_cond_wait(&_pool_cond);
        if (global.running != ICE_RUNNING) break;
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        /* grab a connection and set the socket to blocking */
        while ((con = _get_connection())) {
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            /* Handle meta-connections */
            if(con->event_number > 0) {
                switch(con->event_number) {
                    case EVENT_CONFIG_READ:
                        event_config_read(con->event);
                        break;
                    default:
                        ERROR1("Unknown event number: %d", con->event_number);
                        break;
                }
                free(con);
                continue;
            }

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            stats_event_inc(NULL, "connections");
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            sock_set_blocking(con->sock, SOCK_BLOCK);
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            /* fill header with the http header */
            if (util_read_header(con->sock, header, 4096) == 0) {
                /* either we didn't get a complete header, or we timed out */
                connection_close(con);
                continue;
            }
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            parser = httpp_create_parser();
            httpp_initialize(parser, NULL);
            if (httpp_parse(parser, header, strlen(header))) {
                /* handle the connection or something */
                
                if (strcmp("ICE",  httpp_getvar(parser, HTTPP_VAR_PROTOCOL)) &&
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                    strcmp("HTTP", httpp_getvar(parser, HTTPP_VAR_PROTOCOL))) {
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                    ERROR0("Bad HTTP protocol detected");
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                    connection_close(con);
                    httpp_destroy(parser);
                    continue;
                }
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                rawuri = httpp_getvar(parser, HTTPP_VAR_URI);
                uri = util_normalise_uri(rawuri);

                if(!uri) {
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                    client = client_create(con, parser);
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                    client_send_404(client, "The path you requested was invalid");
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                    continue;
                }
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                if (parser->req_type == httpp_req_source) {
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                    _handle_source_request(con, parser, uri);
                }
                else if (parser->req_type == httpp_req_stats) {
                    _handle_stats_request(con, parser, uri);
                }
                else if (parser->req_type == httpp_req_get) {
                    _handle_get_request(con, parser, uri);
                }
                else {
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                    ERROR0("Wrong request type from client");
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                    connection_close(con);
                    httpp_destroy(parser);