connection.c 49.5 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.
 *
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 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org,
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 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
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 * Copyright 2011,      Dave 'justdave' Miller <justdave@mozilla.com>,
 * Copyright 2011-2014, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
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 */

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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>
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
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#include <sys/types.h>
#include <sys/stat.h>
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#ifndef _WIN32
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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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#endif
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#include "compat.h"
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#include "common/thread/thread.h"
#include "common/avl/avl.h"
#include "common/net/sock.h"
#include "common/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 "admin.h"
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#include "auth.h"
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#define CATMODULE "connection"

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/* Two different major types of source authentication.
   Shoutcast style is used only by the Shoutcast DSP
   and is a crazy version of HTTP.  It looks like :
     Source Client -> Connects to port + 1
     Source Client -> sends encoder password (plaintext)\r\n
     Icecast -> reads encoder password, if ok, sends OK2\r\n, else disconnects
     Source Client -> reads OK2\r\n, then sends http-type request headers
                      that contain the stream details (icy-name, etc..)
     Icecast -> reads headers, stores them
     Source Client -> starts sending MP3 data
     Source Client -> periodically updates metadata via admin.cgi call

   Icecast auth style uses HTTP and Basic Authorization.
*/

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typedef struct client_queue_tag {
    client_t *client;
    int offset;
    int stream_offset;
    int shoutcast;
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    char *shoutcast_mount;
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    struct client_queue_tag *next;
} client_queue_t;
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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;

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typedef struct
{
    char *filename;
    time_t file_recheck;
    time_t file_mtime;
    avl_tree *contents;
} cache_file_contents;

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static spin_t _connection_lock; // protects _current_id, _con_queue, _con_queue_tail
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static volatile unsigned long _current_id = 0;
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static int _initialized = 0;

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static volatile client_queue_t *_req_queue = NULL, **_req_queue_tail = &_req_queue;
static volatile client_queue_t *_con_queue = NULL, **_con_queue_tail = &_con_queue;
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static int ssl_ok;
#ifdef HAVE_OPENSSL
static SSL_CTX *ssl_ctx;
#endif

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/* filtering client connection based on IP */
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static cache_file_contents banned_ip, allowed_ip;
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rwlock_t _source_shutdown_rwlock;
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static void _handle_connection(void);
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static int compare_ip (void *arg, void *a, void *b)
{
    const char *ip = (const char *)a;
    const char *pattern = (const char *)b;

    return strcmp (pattern, ip);
}


static int free_filtered_ip (void*x)
{
    free (x);
    return 1;
}


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void connection_initialize(void)
{
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    if (_initialized) return;
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    thread_spin_create (&_connection_lock);
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    thread_mutex_create(&move_clients_mutex);
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    thread_rwlock_create(&_source_shutdown_rwlock);
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    thread_cond_create(&global.shutdown_cond);
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    _req_queue = NULL;
    _req_queue_tail = &_req_queue;
    _con_queue = NULL;
    _con_queue_tail = &_con_queue;
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    banned_ip.contents = NULL;
    banned_ip.file_mtime = 0;

    allowed_ip.contents = NULL;
    allowed_ip.file_mtime = 0;

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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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#ifdef HAVE_OPENSSL
    SSL_CTX_free (ssl_ctx);
#endif
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    if (banned_ip.contents)  avl_tree_free (banned_ip.contents, free_filtered_ip);
    if (allowed_ip.contents) avl_tree_free (allowed_ip.contents, free_filtered_ip);
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    thread_cond_destroy(&global.shutdown_cond);
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    thread_rwlock_destroy(&_source_shutdown_rwlock);
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    thread_spin_destroy (&_connection_lock);
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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_spin_lock(&_connection_lock);
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    id = _current_id++;
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    thread_spin_unlock(&_connection_lock);
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    return id;
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}

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#ifdef HAVE_OPENSSL
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static void get_ssl_certificate (ice_config_t *config)
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{
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    SSL_METHOD *method;
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    long ssl_opts;
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    ssl_ok = 0;

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    SSL_load_error_strings(); /* readable error messages */
    SSL_library_init(); /* initialize library */
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    method = SSLv23_server_method();
    ssl_ctx = SSL_CTX_new (method);
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    ssl_opts = SSL_CTX_get_options (ssl_ctx);
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#ifdef SSL_OP_NO_COMPRESSION
    SSL_CTX_set_options (ssl_ctx, ssl_opts|SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
#else
    SSL_CTX_set_options (ssl_ctx, ssl_opts|SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3);
#endif
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    do
    {
        if (config->cert_file == NULL)
            break;
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        if (SSL_CTX_use_certificate_chain_file (ssl_ctx, config->cert_file) <= 0)
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        {
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            ICECAST_LOG_WARN("Invalid cert file %s", config->cert_file);
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            break;
        }
        if (SSL_CTX_use_PrivateKey_file (ssl_ctx, config->cert_file, SSL_FILETYPE_PEM) <= 0)
        {
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            ICECAST_LOG_WARN("Invalid private key file %s", config->cert_file);
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            break;
        }
        if (!SSL_CTX_check_private_key (ssl_ctx))
        {
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            ICECAST_LOG_ERROR("Invalid %s - Private key does not match cert public key", config->cert_file);
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            break;
        }
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        if (SSL_CTX_set_cipher_list(ssl_ctx, config->cipher_list) <= 0)
        {
            ICECAST_LOG_WARN("Invalid cipher list: %s", config->cipher_list);
        }
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        ssl_ok = 1;
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        ICECAST_LOG_INFO("SSL certificate found at %s", config->cert_file);
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        ICECAST_LOG_INFO("SSL using ciphers %s", config->cipher_list);
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        return;
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    } while (0);
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    ICECAST_LOG_INFO("No SSL capability on any configured ports");
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}


/* handlers for reading and writing a connection_t when there is ssl
 * configured on the listening port
 */
static int connection_read_ssl (connection_t *con, void *buf, size_t len)
{
    int bytes = SSL_read (con->ssl, buf, len);

    if (bytes < 0)
    {
        switch (SSL_get_error (con->ssl, bytes))
        {
            case SSL_ERROR_WANT_READ:
            case SSL_ERROR_WANT_WRITE:
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            return -1;
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        }
        con->error = 1;
    }
    return bytes;
}

static int connection_send_ssl (connection_t *con, const void *buf, size_t len)
{
    int bytes = SSL_write (con->ssl, buf, len);

    if (bytes < 0)
    {
        switch (SSL_get_error (con->ssl, bytes))
        {
            case SSL_ERROR_WANT_READ:
            case SSL_ERROR_WANT_WRITE:
                return -1;
        }
        con->error = 1;
    }
    else
        con->sent_bytes += bytes;
    return bytes;
}
#else

/* SSL not compiled in, so at least log it */
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static void get_ssl_certificate(ice_config_t *config)
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{
    ssl_ok = 0;
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    ICECAST_LOG_INFO("No SSL capability");
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}
#endif /* HAVE_OPENSSL */


/* handlers (default) for reading and writing a connection_t, no encrpytion
 * used just straight access to the socket
 */
static int connection_read (connection_t *con, void *buf, size_t len)
{
    int bytes = sock_read_bytes (con->sock, buf, len);
    if (bytes == 0)
        con->error = 1;
    if (bytes == -1 && !sock_recoverable (sock_error()))
        con->error = 1;
    return bytes;
}

static int connection_send (connection_t *con, const void *buf, size_t len)
{
    int bytes = sock_write_bytes (con->sock, buf, len);
    if (bytes < 0)
    {
        if (!sock_recoverable (sock_error()))
            con->error = 1;
    }
    else
        con->sent_bytes += bytes;
    return bytes;
}


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/* function to handle the re-populating of the avl tree containing IP addresses
 * for deciding whether a connection of an incoming request is to be dropped.
 */
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static void recheck_ip_file(cache_file_contents *cache)
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{
    time_t now = time(NULL);
    if (now >= cache->file_recheck)
    {
        struct stat file_stat;
        FILE *file = NULL;
        int count = 0;
        avl_tree *new_ips;
        char line [MAX_LINE_LEN];

        cache->file_recheck = now + 10;
        if (cache->filename == NULL)
        {
            if (cache->contents)
            {
                avl_tree_free (cache->contents, free_filtered_ip);
                cache->contents = NULL;
            }
            return;
        }
        if (stat (cache->filename, &file_stat) < 0)
        {
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            ICECAST_LOG_WARN("failed to check status of \"%s\": %s", cache->filename, strerror(errno));
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            return;
        }
        if (file_stat.st_mtime == cache->file_mtime)
            return; /* common case, no update to file */

        cache->file_mtime = file_stat.st_mtime;

        file = fopen (cache->filename, "r");
        if (file == NULL)
        {
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            ICECAST_LOG_WARN("Failed to open file \"%s\": %s", cache->filename, strerror (errno));
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            return;
        }

        new_ips = avl_tree_new (compare_ip, NULL);

        while (get_line (file, line, MAX_LINE_LEN))
        {
            char *str;
            if(!line[0] || line[0] == '#')
                continue;
            count++;
            str = strdup (line);
            if (str)
                avl_insert (new_ips, str);
        }
        fclose (file);
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        ICECAST_LOG_INFO("%d entries read from file \"%s\"", count, cache->filename);
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        if (cache->contents) avl_tree_free (cache->contents, free_filtered_ip);
        cache->contents = new_ips;
    }
}


/* return 0 if the passed ip address is not to be handled by icecast, non-zero otherwise */
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static int accept_ip_address(char *ip)
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{
    void *result;

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    recheck_ip_file(&banned_ip);
    recheck_ip_file(&allowed_ip);
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    if (banned_ip.contents)
    {
        if (avl_get_by_key (banned_ip.contents, ip, &result) == 0)
        {
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            ICECAST_LOG_DEBUG("%s is banned", ip);
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            return 0;
        }
    }
    if (allowed_ip.contents)
    {
        if (avl_get_by_key (allowed_ip.contents, ip, &result) == 0)
        {
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            ICECAST_LOG_DEBUG("%s is allowed", ip);
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            return 1;
        }
        else
        {
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            ICECAST_LOG_DEBUG("%s is not allowed", ip);
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            return 0;
        }
    }
    return 1;
}


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connection_t *connection_create (sock_t sock, sock_t serversock, char *ip)
{
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    connection_t *con;
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    con = (connection_t *)calloc(1, sizeof(connection_t));
    if (con)
    {
        con->sock = sock;
        con->serversock = serversock;
        con->con_time = time(NULL);
        con->id = _next_connection_id();
        con->ip = ip;
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        con->read = connection_read;
        con->send = connection_send;
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    }
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    return con;
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}

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/* prepare connection for interacting over a SSL connection
 */
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void connection_uses_ssl(connection_t *con)
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{
#ifdef HAVE_OPENSSL
    con->read = connection_read_ssl;
    con->send = connection_send_ssl;
    con->ssl = SSL_new (ssl_ctx);
    SSL_set_accept_state (con->ssl);
    SSL_set_fd (con->ssl, con->sock);
#endif
}

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static sock_t wait_for_serversock(int timeout)
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{
#ifdef HAVE_POLL
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    struct pollfd ufds [global.server_sockets];
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    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) {
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        return SOCK_ERROR;
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    }
    else if(ret == 0) {
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        return SOCK_ERROR;
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    }
    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))
                {
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                    sock_close (global.serversock[i]);
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                    ICECAST_LOG_WARN("Had to close a listening socket");
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                }
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                global.serversock[i] = SOCK_ERROR;
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            }
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        }
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        /* remove any closed sockets */
        for(i=0, dst=0; i < global.server_sockets; i++)
        {
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            if (global.serversock[i] == SOCK_ERROR)
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            continue;
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            if (i!=dst)
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            global.serversock[dst] = global.serversock[i];
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            dst++;
        }
        global.server_sockets = dst;
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        return SOCK_ERROR;
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    }
#else
    fd_set rfds;
    struct timeval tv, *p=NULL;
    int i, ret;
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    sock_t max = SOCK_ERROR;
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    FD_ZERO(&rfds);

    for(i=0; i < global.server_sockets; i++) {
        FD_SET(global.serversock[i], &rfds);
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        if (max == SOCK_ERROR || global.serversock[i] > max)
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            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) {
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        return SOCK_ERROR;
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    }
    else if(ret == 0) {
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        return SOCK_ERROR;
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    }
    else {
        for(i=0; i < global.server_sockets; i++) {
            if(FD_ISSET(global.serversock[i], &rfds))
                return global.serversock[i];
        }
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        return SOCK_ERROR; /* Should be impossible, stop compiler warnings */
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    }
#endif
}

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static connection_t *_accept_connection(int duration)
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{
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    sock_t sock, serversock;
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    char *ip;
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    serversock = wait_for_serversock (duration);
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    if (serversock == SOCK_ERROR)
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        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);
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    if (sock != SOCK_ERROR)
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    {
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        connection_t *con = NULL;
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        /* Make any IPv4 mapped IPv6 address look like a normal IPv4 address */
        if (strncmp (ip, "::ffff:", 7) == 0)
            memmove (ip, ip+7, strlen (ip+7)+1);
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        if (accept_ip_address (ip))
            con = connection_create (sock, serversock, ip);
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        if (con)
            return con;
        sock_close (sock);
    }
    else
    {
        if (!sock_recoverable(sock_error()))
        {
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            ICECAST_LOG_WARN("accept() failed with error %d: %s", sock_error(), strerror(sock_error()));
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            thread_sleep (500000);
        }
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    }
    free(ip);
    return NULL;
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}


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/* add client to connection queue. At this point some header information
 * has been collected, so we now pass it onto the connection thread for
 * further processing
 */
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static void _add_connection(client_queue_t *node)
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{
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    thread_spin_lock(&_connection_lock);
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    *_con_queue_tail = node;
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    _con_queue_tail = (volatile client_queue_t **) &node->next;
    thread_spin_unlock(&_connection_lock);
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}


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/* this returns queued clients for the connection thread. headers are
 * already provided, but need to be parsed.
 */
static client_queue_t *_get_connection(void)
{
    client_queue_t *node = NULL;
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    thread_spin_lock (&_connection_lock);

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    if (_con_queue)
    {
        node = (client_queue_t *)_con_queue;
        _con_queue = node->next;
        if (_con_queue == NULL)
            _con_queue_tail = &_con_queue;
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        node->next = NULL;
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    }
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    thread_spin_unlock (&_connection_lock);
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    return node;
}
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/* run along queue checking for any data that has come in or a timeout */
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static void process_request_queue (void)
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{
    client_queue_t **node_ref = (client_queue_t **)&_req_queue;
    ice_config_t *config = config_get_config ();
    int timeout = config->header_timeout;
    config_release_config();
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    while (*node_ref)
    {
        client_queue_t *node = *node_ref;
        client_t *client = node->client;
        int len = PER_CLIENT_REFBUF_SIZE - 1 - node->offset;
        char *buf = client->refbuf->data + node->offset;
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        if (len > 0)
        {
            if (client->con->con_time + timeout <= time(NULL))
                len = 0;
            else
                len = client_read_bytes (client, buf, len);
        }
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        if (len > 0)
        {
            int pass_it = 1;
            char *ptr;

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            /* handle \n, \r\n and nsvcap which for some strange reason has
             * EOL as \r\r\n */
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            node->offset += len;
            client->refbuf->data [node->offset] = '\000';
            do
            {
                if (node->shoutcast == 1)
                {
                    /* password line */
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                    if (strstr (client->refbuf->data, "\r\r\n") != NULL)
                        break;
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                    if (strstr (client->refbuf->data, "\r\n") != NULL)
                        break;
                    if (strstr (client->refbuf->data, "\n") != NULL)
                        break;
                }
                /* stream_offset refers to the start of any data sent after the
                 * http style headers, we don't want to lose those */
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                ptr = strstr (client->refbuf->data, "\r\r\n\r\r\n");
                if (ptr)
                {
                    node->stream_offset = (ptr+6) - client->refbuf->data;
                    break;
                }
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                ptr = strstr (client->refbuf->data, "\r\n\r\n");
                if (ptr)
                {
                    node->stream_offset = (ptr+4) - client->refbuf->data;
                    break;
                }
                ptr = strstr (client->refbuf->data, "\n\n");
                if (ptr)
                {
                    node->stream_offset = (ptr+2) - client->refbuf->data;
                    break;
                }
                pass_it = 0;
            } while (0);
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            if (pass_it)
            {
                if ((client_queue_t **)_req_queue_tail == &(node->next))
                    _req_queue_tail = (volatile client_queue_t **)node_ref;
                *node_ref = node->next;
                node->next = NULL;
                _add_connection (node);
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                continue;
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            }
        }
        else
        {
            if (len == 0 || client->con->error)
            {
                if ((client_queue_t **)_req_queue_tail == &node->next)
                    _req_queue_tail = (volatile client_queue_t **)node_ref;
                *node_ref = node->next;
                client_destroy (client);
                free (node);
                continue;
            }
        }
        node_ref = &node->next;
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    }
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    _handle_connection();
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}

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/* add node to the queue of requests. This is where the clients are when
 * initial http details are read.
 */
static void _add_request_queue (client_queue_t *node)
{
    *_req_queue_tail = node;
    _req_queue_tail = (volatile client_queue_t **)&node->next;
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}

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void connection_accept_loop (void)
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{
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    connection_t *con;
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    ice_config_t *config;
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    int duration = 300;
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    config = config_get_config ();
    get_ssl_certificate (config);
    config_release_config ();
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    while (global.running == ICECAST_RUNNING)
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    {
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        con = _accept_connection (duration);
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        if (con)
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        {
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            client_queue_t *node;
            ice_config_t *config;
            client_t *client = NULL;
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            listener_t *listener;
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            global_lock();
            if (client_create (&client, con, NULL) < 0)
            {
                global_unlock();
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                client_send_error(client, 403, 1, "Icecast connection limit reached");
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                /* don't be too eager as this is an imposed hard limit */
                thread_sleep (400000);
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                continue;
            }
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            /* setup client for reading incoming http */
            client->refbuf->data [PER_CLIENT_REFBUF_SIZE-1] = '\000';

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            if (sock_set_blocking (client->con->sock, 0) || sock_set_nodelay (client->con->sock))
            {
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                global_unlock();
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                ICECAST_LOG_WARN("failed to set tcp options on client connection, dropping");
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                client_destroy (client);
                continue;
            }

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            node = calloc (1, sizeof (client_queue_t));
            if (node == NULL)
            {
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                global_unlock();
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                client_destroy (client);
                continue;
            }
            node->client = client;

            config = config_get_config();
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            listener = config_get_listen_sock (config, client->con);

            if (listener)
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            {
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                if (listener->shoutcast_compat)
                    node->shoutcast = 1;
                if (listener->ssl && ssl_ok)
                    connection_uses_ssl (client->con);
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                if (listener->shoutcast_mount)
                    node->shoutcast_mount = strdup (listener->shoutcast_mount);
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            }
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            global_unlock();
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            config_release_config();
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            _add_request_queue (node);
            stats_event_inc (NULL, "connections");
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            duration = 5;
        }
        else
        {
            if (_req_queue == NULL)
                duration = 300; /* use longer timeouts when nothing waiting */
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        }
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        process_request_queue ();
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    }
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    /* Give all the other threads notification to shut down */
    thread_cond_broadcast(&global.shutdown_cond);

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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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}

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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, int response)
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{
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    ice_config_t *config;
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    global_lock ();
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    ICECAST_LOG_DEBUG("sources count is %d", global.sources);
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    config = config_get_config();
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    if (global.sources < config->source_limit)
    {
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        const char *contenttype;
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        const char *expectcontinue;
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        mount_proxy *mountinfo;
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        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)
            {
                config_release_config();
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                global_unlock();
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                if (response) {
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                    client_send_error(source->client, 403, 1, "Content-type not supported");
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                    source->client = NULL;
                }
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                ICECAST_LOG_WARN("Content-type \"%s\" not supported, dropping source", contenttype);
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                return -1;
            }
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        } else if (source->parser->req_type == httpp_req_put) {
            config_release_config();
            global_unlock();
            if (response) {
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                client_send_error(source->client, 403, 1, "No Content-type given");
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                source->client = NULL;
            }
            ICECAST_LOG_ERROR("Content-type not given in PUT request, dropping source");
            return -1;
        } else {
            ICECAST_LOG_ERROR("No content-type header, falling back to backwards compatibility mode "
                    "for icecast 1.x relays. Assuming content is mp3. This behaviour is deprecated "
                    "and the source client will NOT work with future Icecast versions!");
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            format_type = FORMAT_TYPE_GENERIC;
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        }

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        if (format_get_plugin (format_type, source) < 0)
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        {
            global_unlock();
            config_release_config();
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            if (response)
            {
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                client_send_error(source->client, 403, 1, "internal format allocation problem");
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                source->client = NULL;
            }
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            ICECAST_LOG_WARN("plugin format failed for \"%s\"", source->mount);
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            return -1;
        }

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        /* For PUT support we check for 100-continue and send back a 100 to stay in spec */
        expectcontinue = httpp_getvar (source->parser, "expect");
        if (expectcontinue != NULL)
        {
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#ifdef HAVE_STRCASESTR
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            if (strcasestr (expectcontinue, "100-continue") != NULL)
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#else
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            ICECAST_LOG_WARN("OS doesn't support case insenestive substring checks...");
            if (strstr (expectcontinue, "100-continue") != NULL)
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#endif
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            {
                client_send_100 (source->client);
            }
        }
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        global.sources++;
        stats_event_args (NULL, "sources", "%d", global.sources);
        global_unlock();
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        source->running = 1;
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        mountinfo = config_find_mount (config, source->mount, MOUNT_TYPE_NORMAL);
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        source_update_settings (config, source, mountinfo);
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        config_release_config();
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        slave_rebuild_mounts();
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        source->shutdown_rwlock = &_source_shutdown_rwlock;
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        ICECAST_LOG_DEBUG("source is ready to start");
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        return 0;
    }
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    ICECAST_LOG_WARN("Request to add source when maximum source limit "
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            "reached %d", global.sources);

    global_unlock();
    config_release_config();

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    if (response)
    {
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        client_send_error(source->client, 403, 1, "too many sources connected");
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        source->client = NULL;
    }
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    return -1;
}

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static inline void source_startup (client_t *client, const char *uri)
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{
    source_t *source;
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    source = source_reserve (uri);
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    if (source)
    {
        source->client = client;
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        source->parser = client->parser;
        source->con = client->con;
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        if (connection_complete_source (source, 1) < 0)
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        {
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            source_clear_source (source);
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            source_free_source (source);
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            return;
        }
        client->respcode = 200;
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        if (client->protocol == ICECAST_PROTOCOL_SHOUTCAST) {
            client->respcode = 200;
            /* send this non-blocking but if there is only a partial write
             * then leave to header timeout */
            sock_write (client->con->sock, "OK2\r\nicy-caps:11\r\n\r\n");
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            source->shoutcast_compat = 1;
            source_client_callback (client, source);
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        } else {
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            refbuf_t *ok = refbuf_new (PER_CLIENT_REFBUF_SIZE);
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            client->respcode = 200;
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            snprintf (ok->data, PER_CLIENT_REFBUF_SIZE,
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                    "HTTP/1.0 200 OK\r\n\r\n");
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            ok->len = strlen (ok->data);
            /* we may have unprocessed data read in, so don't overwrite it */
            ok->associated = client->refbuf;
            client->refbuf = ok;
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            fserve_add_client_callback (client, source_client_callback, source);
        }
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    }
    else
    {
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        client_send_error(client, 403, 1, "Mountpoint in use");
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        ICECAST_LOG_WARN("Mountpoint %s in use", uri);
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    }
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}

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/* only called for native icecast source clients */
static void _handle_source_request (client_t *client, const char *uri)
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{
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    ICECAST_LOG_INFO("Source logging in at mountpoint \"%s\" from %s as role %s",
        uri, client->con->ip, client->role);
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    if (uri[0] != '/')
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    {
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        ICECAST_LOG_WARN("source mountpoint not starting with /");
        client_send_error(client, 400, 1, "source mountpoint not starting with /");
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        return;
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    }
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    source_startup(client, uri);
}


static void _handle_stats_request (client_t *client, char *uri)
{
    stats_event_inc(NULL, "stats_connections");

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    client->respcode = 200;
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    snprintf (client->refbuf->data, PER_CLIENT_REFBUF_SIZE,
            "HTTP/1.0 200 OK\r\n\r\n");
    client->refbuf->len = strlen (client->refbuf->data);
    fserve_add_client_callback (client, stats_callback, NULL);
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}

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/* if 0 is returned then the client should not be touched, however if -1
 * is returned then the caller is responsible for handling the client
 */
static int __add_listener_to_source (source_t *source, client_t *client)
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{
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    size_t loop = 10;
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    do
    {
        ICECAST_LOG_DEBUG("max on %s is %ld (cur %lu)", source->mount,
                source->max_listeners, source->listeners);
        if (source->max_listeners == -1)
            break;
        if (source->listeners < (unsigned long)source->max_listeners)
            break;
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        if (loop && source->fallback_when_full && source->fallback_mount)
        {
            source_t *next = source_find_mount (source->fallback_mount);
            if (!next) {
                ICECAST_LOG_ERROR("Fallback '%s' for full source '%s' not found",
                        source->mount, source->fallback_mount);
                return -1;
            }

            ICECAST_LOG_INFO("stream full trying %s", next->mount);
            source = next;
            loop--;
            continue;
        }
        /* now we fail the client */
        return -1;
    } while (1);

    client->write_to_client = format_generic_write_to_client;
    client->check_buffer = format_check_http_buffer;
    client->refbuf->len = PER_CLIENT_REFBUF_SIZE;
    memset (client->refbuf->data, 0, PER_CLIENT_REFBUF_SIZE);

    /* lets add the client to the active list */
    avl_tree_wlock (source->pending_tree);
    avl_insert (source->pending_tree, client);
    avl_tree_unlock (source->pending_tree);

    if (source->running == 0 && source->on_demand)
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    {
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        /* enable on-demand relay to start, wake up the slave thread */
        ICECAST_LOG_DEBUG("kicking off on-demand relay");
        source->on_demand_req = 1;
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    }
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    ICECAST_LOG_DEBUG("Added client to %s", source->mount);
    return 0;
}
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/* count the number of clients on a mount with same username and same role as the given one */
static inline ssize_t __count_user_role_on_mount (source_t *source, client_t *client) {
    ssize_t ret = 0;
    avl_node *node;

    avl_tree_rlock(source->client_tree);
    node = avl_get_first(source->client_tree);
    while (node) {
        client_t *existing_client = (client_t *)node->key;
        if (existing_client->username && client->username &&
            strcmp(existing_client->username, client->username) == 0 &&
            existing_client->role && client->role &&
            strcmp(existing_client->role, client->role) == 0)
            ret++;
        node = avl_get_next(node);
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    }
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    avl_tree_unlock(source->client_tree);

    avl_tree_rlock(source->pending_tree);
    node = avl_get_first(source->pending_tree);
    while (node)
    {
        client_t *existing_client = (client_t *)node->key;
        if (existing_client->username && client->username &&
            strcmp(existing_client->username, client->username) == 0 &&
            existing_client->role && client->role &&
            strcmp(existing_client->role, client->role) == 0)
            ret++;
        node = avl_get_next(node);
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    }
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    avl_tree_unlock(source->pending_tree);

    return ret;
}

static void _handle_get_request (client_t *client, char *uri) {
    source_t *source = NULL;

    ICECAST_LOG_DEBUG("Got client %p with URI %H", client, uri);

    /* 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 and
     * fserve clients, which are looking for static files.
     */
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    stats_event_inc(NULL, "client_connections");
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    /* Dispatch all admin requests */
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    if ((strcmp(uri, "/admin.cgi") == 0) ||
        (strncmp(uri, "/admin/", 7) == 0)) {
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        ICECAST_LOG_DEBUG("Client %p requesting admin interface.", client);
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        admin_handle_request(client, uri);
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        return;
    }
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    /* this is a web/ request. let's check if we are allowed to do that. */
    if (acl_test_web(client->acl) != ACL_POLICY_ALLOW) {
        /* doesn't seem so, sad client :( */
        if (client->protocol == ICECAST_PROTOCOL_SHOUTCAST) {
            client_destroy(client);
        } else {
            client_send_error(client, 401, 1, "You need to authenticate\r\n");
        }
        return;
    }

    if (util_check_valid_extension(uri) == XSLT_CONTENT) {
        /* If the file exists, then transform it, otherwise, write a 404 */
        ICECAST_LOG_DEBUG("Stats request, sending XSL transformed stats");
        stats_transform_xslt(client, uri);
        return;
    }

    avl_tree_rlock(global.source_tree);
    /* let's see if this is a source or just a random fserve file */
    source = source_find_mount(uri);
    if (source) {
        /* true mount */
        int in_error = 0;
        ssize_t max_connections_per_user = acl_get_max_connections_per_user(client->acl);
        /* check for duplicate_logins */
        if (max_connections_per_user > 0) { /* -1 = not set (-> default=unlimited), 0 = unlimited */
            if (max_connections_per_user <= __count_user_role_on_mount(source, client)) {
                client_send_error(client, 403, 1, "Reached limit of concurrent connections on those credentials");
                in_error = 1;
            }
        }


        /* Set max listening duration in case not already set. */
        if (!in_error && client->con->discon_time == 0) {
            time_t connection_duration = acl_get_max_connection_duration(client->acl);
            if (connection_duration == -1) {
                ice_config_t *config = config_get_config();
                mount_proxy *mount = config_find_mount(config, source->mount, MOUNT_TYPE_NORMAL);
                if (mount && mount->max_listener_duration)
                    connection_duration = mount->max_listener_duration;
                config_release_config();
            }

            if (connection_duration > 0) /* -1 = not set (-> default=unlimited), 0 = unlimited */
                client->con->discon_time = connection_duration + time(NULL);
        }
        if (!in_error && __add_listener_to_source(source, client) == -1) {
            client_send_error(client, 403, 1, "Rejecting client for whatever reason");
        }
        avl_tree_unlock(global.source_tree);
    } else {
        /* file */
        avl_tree_unlock(global.source_tree);
        fserve_client_create(client, uri);
    }
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}

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static void _handle_shoutcast_compatible (client_queue_t *node)
{
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    char *http_compliant;
    int http_compliant_len = 0;
    http_parser_t *parser;
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    const char *shoutcast_mount;
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    client_t *client = node->client;
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    ice_config_t *config;
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    if (node->shoutcast == 1)
    {
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        char *ptr, *headers;
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        /* Get rid of trailing \r\n or \n after password */
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        ptr = strstr (client->refbuf->data, "\r\r\n");
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        if (ptr)
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            headers = ptr+3;
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        else
        {
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            ptr = strstr (client->refbuf->data, "\r\n");
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            if (ptr)
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                headers = ptr+2;
            else
            {
                ptr = strstr (client->refbuf->data, "\n");
                if (ptr)
                    headers = ptr+1;
            }
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        }
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        if (ptr == NULL)
        {
            client_destroy (client);
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            free (node->shoutcast_mount);
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            free (node);
            return;
        }
        *ptr = '\0';

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        client->password = strdup(client->refbuf->data);
        node->offset -= (headers - client->refbuf->data);
        memmove (client->refbuf->data, headers, node->offset+1);
        node->shoutcast = 2;
        /* we've checked the password, now send it back for reading headers */
        _add_request_queue (node);
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        return;
    }
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    /* actually make a copy as we are dropping the config lock */
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    /* Here we create a valid HTTP request based of the information
       that was passed in via the non-HTTP style protocol above. This
       means we can use some of our existing code to handle this case */
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    config =</