/*
 * Copyright (C) Roman Arutyunyan
 * Copyright (C) Winshining
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <nginx.h>
#include "ngx_rtmp.h"


static char *ngx_rtmp_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_rtmp_optimize_servers(ngx_conf_t *cf,
    ngx_rtmp_core_main_conf_t *cmcf, ngx_array_t *ports);
static ngx_int_t ngx_rtmp_server_names(ngx_conf_t *cf,
    ngx_rtmp_core_main_conf_t *cmcf, ngx_rtmp_conf_addr_t *addr);
static int ngx_libc_cdecl ngx_rtmp_cmp_dns_wildcards(const void *one,
    const void *two);

static ngx_int_t ngx_rtmp_init_listening(ngx_conf_t *cf,
    ngx_rtmp_conf_port_t *port);
static ngx_listening_t *ngx_rtmp_add_listening(ngx_conf_t *cf,
    ngx_rtmp_conf_addr_t *addr);

static ngx_int_t ngx_rtmp_add_addrs(ngx_conf_t *cf, ngx_rtmp_port_t *mport,
    ngx_rtmp_conf_addr_t *addr);
#if (NGX_HAVE_INET6)
static ngx_int_t ngx_rtmp_add_addrs6(ngx_conf_t *cf, ngx_rtmp_port_t *mport,
    ngx_rtmp_conf_addr_t *addr);
#endif
static ngx_int_t ngx_rtmp_cmp_conf_addrs(const void *one, const void *two);
static ngx_int_t ngx_rtmp_find_virtual_server(ngx_connection_t *c,
    ngx_rtmp_virtual_names_t *virtual_names, ngx_str_t *host,
    ngx_rtmp_session_t *s, ngx_rtmp_core_srv_conf_t **cscfp);
static ngx_int_t ngx_rtmp_init_events(ngx_conf_t *cf,
        ngx_rtmp_core_main_conf_t *cmcf);
static ngx_int_t ngx_rtmp_init_event_handlers(ngx_conf_t *cf,
        ngx_rtmp_core_main_conf_t *cmcf);
static char * ngx_rtmp_merge_applications(ngx_conf_t *cf,
        ngx_array_t *applications, void **app_conf, ngx_rtmp_module_t *module,
        ngx_uint_t ctx_index);
static ngx_int_t ngx_rtmp_init_process(ngx_cycle_t *cycle);


#if (nginx_version >= 1007011)
ngx_queue_t                         ngx_rtmp_init_queue;
#elif (nginx_version >= 1007005)
ngx_thread_volatile ngx_queue_t     ngx_rtmp_init_queue;
#else
ngx_thread_volatile ngx_event_t    *ngx_rtmp_init_queue;
#endif


ngx_uint_t  ngx_rtmp_max_module;


static ngx_command_t  ngx_rtmp_commands[] = {

    { ngx_string("rtmp"),
      NGX_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
      ngx_rtmp_block,
      0,
      0,
      NULL },

      ngx_null_command
};


static ngx_core_module_t  ngx_rtmp_module_ctx = {
    ngx_string("rtmp"),
    NULL,
    NULL
};


ngx_module_t  ngx_rtmp_module = {
    NGX_MODULE_V1,
    &ngx_rtmp_module_ctx,                  /* module context */
    ngx_rtmp_commands,                     /* module directives */
    NGX_CORE_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    ngx_rtmp_init_process,                 /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static char *
ngx_rtmp_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    char                        *rv;
    ngx_uint_t                   m, mi, s;
    ngx_conf_t                   pcf;
    ngx_module_t               **modules;
    ngx_rtmp_module_t           *module;
    ngx_rtmp_conf_ctx_t         *ctx;
    ngx_rtmp_core_srv_conf_t    *cscf, **cscfp;
    ngx_rtmp_core_main_conf_t   *cmcf;

    ctx = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_conf_ctx_t));
    if (ctx == NULL) {
        return NGX_CONF_ERROR;
    }

    *(ngx_rtmp_conf_ctx_t **) conf = ctx;

    /* count the number of the rtmp modules and set up their indices */

#if (nginx_version >= 1009011)

    ngx_rtmp_max_module = ngx_count_modules(cf->cycle, NGX_RTMP_MODULE);

#else

    ngx_rtmp_max_module = 0;
    for (m = 0; ngx_modules[m]; m++) {
        if (ngx_modules[m]->type != NGX_RTMP_MODULE) {
            continue;
        }

        ngx_modules[m]->ctx_index = ngx_rtmp_max_module++;
    }

#endif


    /* the rtmp main_conf context, it is the same in the all rtmp contexts */

    ctx->main_conf = ngx_pcalloc(cf->pool,
                                 sizeof(void *) * ngx_rtmp_max_module);
    if (ctx->main_conf == NULL) {
        return NGX_CONF_ERROR;
    }


    /*
     * the rtmp null srv_conf context, it is used to merge
     * the server{}s' srv_conf's
     */

    ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_rtmp_max_module);
    if (ctx->srv_conf == NULL) {
        return NGX_CONF_ERROR;
    }


    /*
     * the rtmp null app_conf context, it is used to merge
     * the server{}s' app_conf's
     */

    ctx->app_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_rtmp_max_module);
    if (ctx->app_conf == NULL) {
        return NGX_CONF_ERROR;
    }


    /*
     * create the main_conf's, the null srv_conf's, and the null app_conf's
     * of the all rtmp modules
     */

#if (nginx_version >= 1009011)
    modules = cf->cycle->modules;
#else
    modules = ngx_modules;
#endif

    for (m = 0; modules[m]; m++) {
        if (modules[m]->type != NGX_RTMP_MODULE) {
            continue;
        }

        module = modules[m]->ctx;
        mi = modules[m]->ctx_index;

        if (module->create_main_conf) {
            ctx->main_conf[mi] = module->create_main_conf(cf);
            if (ctx->main_conf[mi] == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        if (module->create_srv_conf) {
            ctx->srv_conf[mi] = module->create_srv_conf(cf);
            if (ctx->srv_conf[mi] == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        if (module->create_app_conf) {
            ctx->app_conf[mi] = module->create_app_conf(cf);
            if (ctx->app_conf[mi] == NULL) {
                return NGX_CONF_ERROR;
            }
        }
    }

    pcf = *cf;
    cf->ctx = ctx;

    for (m = 0; modules[m]; m++) {
        if (modules[m]->type != NGX_RTMP_MODULE) {
            continue;
        }

        module = modules[m]->ctx;

        if (module->preconfiguration) {
            if (module->preconfiguration(cf) != NGX_OK) {
                return NGX_CONF_ERROR;
            }
        }
    }

    /* parse inside the rtmp{} block */

    cf->module_type = NGX_RTMP_MODULE;
    cf->cmd_type = NGX_RTMP_MAIN_CONF;
    rv = ngx_conf_parse(cf, NULL);

    if (rv != NGX_CONF_OK) {
        *cf = pcf;
        return rv;
    }


    /* init rtmp{} main_conf's, merge the server{}s' srv_conf's */

    cmcf = ctx->main_conf[ngx_rtmp_core_module.ctx_index];
    cscfp = cmcf->servers.elts;

    for (m = 0; modules[m]; m++) {
        if (modules[m]->type != NGX_RTMP_MODULE) {
            continue;
        }

        module = modules[m]->ctx;
        mi = modules[m]->ctx_index;

        /* init rtmp{} main_conf's */

        cf->ctx = ctx;

        if (module->init_main_conf) {
            rv = module->init_main_conf(cf, ctx->main_conf[mi]);
            if (rv != NGX_CONF_OK) {
                *cf = pcf;
                return rv;
            }
        }

        for (s = 0; s < cmcf->servers.nelts; s++) {

            /* merge the server{}s' srv_conf's */

            cf->ctx = cscfp[s]->ctx;

            if (module->merge_srv_conf) {
                rv = module->merge_srv_conf(cf,
                                            ctx->srv_conf[mi],
                                            cscfp[s]->ctx->srv_conf[mi]);
                if (rv != NGX_CONF_OK) {
                    *cf = pcf;
                    return rv;
                }
            }

            if (module->merge_app_conf) {

                /* merge the server{}'s app_conf */

                /*ctx->app_conf = cscfp[s]->ctx->app_conf;*/

                rv = module->merge_app_conf(cf,
                                            ctx->app_conf[mi],
                                            cscfp[s]->ctx->app_conf[mi]);
                if (rv != NGX_CONF_OK) {
                    *cf = pcf;
                    return rv;
                }

                /* merge the applications{}' app_conf's */

                cscf = cscfp[s]->ctx->srv_conf[ngx_rtmp_core_module.ctx_index];

                rv = ngx_rtmp_merge_applications(cf, &cscf->applications,
                                            cscfp[s]->ctx->app_conf,
                                            module, mi);
                if (rv != NGX_CONF_OK) {
                    *cf = pcf;
                    return rv;
                }
            }

        }
    }

    cf->ctx = ctx;

    if (ngx_rtmp_init_events(cf, cmcf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    for (m = 0; modules[m]; m++) {
        if (modules[m]->type != NGX_RTMP_MODULE) {
            continue;
        }

        module = modules[m]->ctx;

        if (module->postconfiguration) {
            if (module->postconfiguration(cf) != NGX_OK) {
                return NGX_CONF_ERROR;
            }
        }
    }

    *cf = pcf;

    cscfp = cmcf->servers.elts;
    for (s = 0; s < cmcf->servers.nelts; s++) {
        cscfp[s]->index = s;
    }

    if (ngx_rtmp_init_event_handlers(cf, cmcf) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    if (ngx_rtmp_optimize_servers(cf, cmcf, cmcf->ports) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_rtmp_merge_applications(ngx_conf_t *cf, ngx_array_t *applications,
            void **app_conf, ngx_rtmp_module_t *module, ngx_uint_t ctx_index)
{
    char                           *rv;
    ngx_rtmp_conf_ctx_t            *ctx, saved;
    ngx_rtmp_core_app_conf_t      **cacfp;
    ngx_uint_t                      n;
    ngx_rtmp_core_app_conf_t       *cacf;

    if (applications == NULL) {
        return NGX_CONF_OK;
    }

    ctx = (ngx_rtmp_conf_ctx_t *) cf->ctx;
    saved = *ctx;

    cacfp = applications->elts;
    for (n = 0; n < applications->nelts; ++n, ++cacfp) {

        ctx->app_conf = (*cacfp)->app_conf;

        rv = module->merge_app_conf(cf, app_conf[ctx_index],
                (*cacfp)->app_conf[ctx_index]);
        if (rv != NGX_CONF_OK) {
            return rv;
        }

        cacf = (*cacfp)->app_conf[ngx_rtmp_core_module.ctx_index];
        rv = ngx_rtmp_merge_applications(cf, &cacf->applications,
                                         (*cacfp)->app_conf,
                                         module, ctx_index);
        if (rv != NGX_CONF_OK) {
            return rv;
        }
    }

    *ctx = saved;

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_rtmp_init_events(ngx_conf_t *cf, ngx_rtmp_core_main_conf_t *cmcf)
{
    size_t                      n;

    for(n = 0; n < NGX_RTMP_MAX_EVENT; ++n) {
        if (ngx_array_init(&cmcf->events[n], cf->pool, 1,
                sizeof(ngx_rtmp_handler_pt)) != NGX_OK)
        {
            return NGX_ERROR;
        }
    }

    if (ngx_array_init(&cmcf->amf, cf->pool, 1,
                sizeof(ngx_rtmp_amf_handler_t)) != NGX_OK)
    {
        return NGX_ERROR;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_init_event_handlers(ngx_conf_t *cf, ngx_rtmp_core_main_conf_t *cmcf)
{
    ngx_hash_init_t             calls_hash;
    ngx_rtmp_handler_pt        *eh;
    ngx_rtmp_amf_handler_t     *h;
    ngx_hash_key_t             *ha;
    size_t                      n, m;

    static size_t               pm_events[] = {
        NGX_RTMP_MSG_CHUNK_SIZE,
        NGX_RTMP_MSG_ABORT,
        NGX_RTMP_MSG_ACK,
        NGX_RTMP_MSG_ACK_SIZE,
        NGX_RTMP_MSG_BANDWIDTH
    };

    static size_t               amf_events[] = {
        NGX_RTMP_MSG_AMF_CMD,
        NGX_RTMP_MSG_AMF_META,
        NGX_RTMP_MSG_AMF_SHARED,
        NGX_RTMP_MSG_AMF3_CMD,
        NGX_RTMP_MSG_AMF3_META,
        NGX_RTMP_MSG_AMF3_SHARED
    };

    /* init standard protocol events */
    for(n = 0; n < sizeof(pm_events) / sizeof(pm_events[0]); ++n) {
        eh = ngx_array_push(&cmcf->events[pm_events[n]]);
        *eh = ngx_rtmp_protocol_message_handler;
    }

    /* init amf events */
    for(n = 0; n < sizeof(amf_events) / sizeof(amf_events[0]); ++n) {
        eh = ngx_array_push(&cmcf->events[amf_events[n]]);
        *eh = ngx_rtmp_amf_message_handler;
    }

    /* init user protocol events */
    eh = ngx_array_push(&cmcf->events[NGX_RTMP_MSG_USER]);
    *eh = ngx_rtmp_user_message_handler;

    /* aggregate to audio/video map */
    eh = ngx_array_push(&cmcf->events[NGX_RTMP_MSG_AGGREGATE]);
    *eh = ngx_rtmp_aggregate_message_handler;

    /* init amf callbacks */
    ngx_array_init(&cmcf->amf_arrays, cf->pool, 1, sizeof(ngx_hash_key_t));

    h = cmcf->amf.elts;
    for(n = 0; n < cmcf->amf.nelts; ++n, ++h) {
        ha = cmcf->amf_arrays.elts;
        for(m = 0; m < cmcf->amf_arrays.nelts; ++m, ++ha) {
            if (h->name.len == ha->key.len
                    && !ngx_strncmp(h->name.data, ha->key.data, ha->key.len))
            {
                break;
            }
        }
        if (m == cmcf->amf_arrays.nelts) {
            ha = ngx_array_push(&cmcf->amf_arrays);
            ha->key = h->name;
            ha->key_hash = ngx_hash_key_lc(ha->key.data, ha->key.len);
            ha->value = ngx_array_create(cf->pool, 1,
                    sizeof(ngx_rtmp_handler_pt));
            if (ha->value == NULL) {
                return NGX_ERROR;
            }
        }

        eh = ngx_array_push((ngx_array_t*)ha->value);
        *eh = h->handler;
    }

    calls_hash.hash = &cmcf->amf_hash;
    calls_hash.key = ngx_hash_key_lc;
    calls_hash.max_size = 512;
    calls_hash.bucket_size = ngx_cacheline_size;
    calls_hash.name = "amf_hash";
    calls_hash.pool = cf->pool;
    calls_hash.temp_pool = NULL;

    if (ngx_hash_init(&calls_hash, cmcf->amf_arrays.elts, cmcf->amf_arrays.nelts)
            != NGX_OK)
    {
        return NGX_ERROR;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_optimize_servers(ngx_conf_t *cf, ngx_rtmp_core_main_conf_t *cmcf,
    ngx_array_t *ports)
{
    ngx_uint_t             p, a;
    ngx_rtmp_conf_port_t  *port;
    ngx_rtmp_conf_addr_t  *addr;

    if (ports == NULL) {
        return NGX_OK;
    }

    port = ports->elts;
    for (p = 0; p < ports->nelts; p++) {

        ngx_sort(port[p].addrs.elts, (size_t) port[p].addrs.nelts,
                 sizeof(ngx_rtmp_conf_addr_t), ngx_rtmp_cmp_conf_addrs);

        /*
         * check whether all name-based servers have the same
         * configuration as a default server for given address:port
         */

        addr = port[p].addrs.elts;
        for (a = 0; a < port[p].addrs.nelts; a++) {

            if (addr[a].servers.nelts > 1
#if (NGX_PCRE)
                || addr[a].default_server->captures
#endif
               )
            {
                if (ngx_rtmp_server_names(cf, cmcf, &addr[a]) != NGX_OK) {
                    return NGX_ERROR;
                }
            }
        }

        if (ngx_rtmp_init_listening(cf, &port[p]) != NGX_OK) {
            return NGX_ERROR;
        }
    }

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_server_names(ngx_conf_t *cf, ngx_rtmp_core_main_conf_t *cmcf,
    ngx_rtmp_conf_addr_t *addr)
{
    ngx_int_t                   rc;
    ngx_uint_t                  n, s;
    ngx_hash_init_t             hash;
    ngx_hash_keys_arrays_t      ha;
    ngx_rtmp_server_name_t     *name;
    ngx_rtmp_core_srv_conf_t  **cscfp;
#if (NGX_PCRE)
    ngx_uint_t                  regex, i;

    regex = 0;
#endif

    ngx_memzero(&ha, sizeof(ngx_hash_keys_arrays_t));

    ha.temp_pool = ngx_create_pool(NGX_DEFAULT_POOL_SIZE, cf->log);
    if (ha.temp_pool == NULL) {
        return NGX_ERROR;
    }

    ha.pool = cf->pool;

    if (ngx_hash_keys_array_init(&ha, NGX_HASH_LARGE) != NGX_OK) {
        goto failed;
    }

    cscfp = addr->servers.elts;

    for (s = 0; s < addr->servers.nelts; s++) {

        name = cscfp[s]->server_names.elts;

        for (n = 0; n < cscfp[s]->server_names.nelts; n++) {

#if (NGX_PCRE)
            if (name[n].regex) {
                regex++;
                continue;
            }
#endif

            rc = ngx_hash_add_key(&ha, &name[n].name, name[n].server,
                                  NGX_HASH_WILDCARD_KEY);

            if (rc == NGX_ERROR) {
                return NGX_ERROR;
            }

            if (rc == NGX_DECLINED) {
                ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                              "invalid server name or wildcard \"%V\" on %s",
                              &name[n].name, addr->opt.addr);
                return NGX_ERROR;
            }

            if (rc == NGX_BUSY) {
                ngx_log_error(NGX_LOG_WARN, cf->log, 0,
                              "conflicting server name \"%V\" on %s, ignored",
                              &name[n].name, addr->opt.addr);
            }
        }
    }

    hash.key = ngx_hash_key_lc;
    hash.max_size = cmcf->server_names_hash_max_size;
    hash.bucket_size = cmcf->server_names_hash_bucket_size;
    hash.name = "server_names_hash";
    hash.pool = cf->pool;

    if (ha.keys.nelts) {
        hash.hash = &addr->hash;
        hash.temp_pool = NULL;

        if (ngx_hash_init(&hash, ha.keys.elts, ha.keys.nelts) != NGX_OK) {
            goto failed;
        }
    }

    if (ha.dns_wc_head.nelts) {

        ngx_qsort(ha.dns_wc_head.elts, (size_t) ha.dns_wc_head.nelts,
                  sizeof(ngx_hash_key_t), ngx_rtmp_cmp_dns_wildcards);

        hash.hash = NULL;
        hash.temp_pool = ha.temp_pool;

        if (ngx_hash_wildcard_init(&hash, ha.dns_wc_head.elts,
                                   ha.dns_wc_head.nelts)
            != NGX_OK)
        {
            goto failed;
        }

        addr->wc_head = (ngx_hash_wildcard_t *) hash.hash;
    }

    if (ha.dns_wc_tail.nelts) {

        ngx_qsort(ha.dns_wc_tail.elts, (size_t) ha.dns_wc_tail.nelts,
                  sizeof(ngx_hash_key_t), ngx_rtmp_cmp_dns_wildcards);

        hash.hash = NULL;
        hash.temp_pool = ha.temp_pool;

        if (ngx_hash_wildcard_init(&hash, ha.dns_wc_tail.elts,
                                   ha.dns_wc_tail.nelts)
            != NGX_OK)
        {
            goto failed;
        }

        addr->wc_tail = (ngx_hash_wildcard_t *) hash.hash;
    }

    ngx_destroy_pool(ha.temp_pool);

#if (NGX_PCRE)

    if (regex == 0) {
        return NGX_OK;
    }

    addr->nregex = regex;
    addr->regex = ngx_palloc(cf->pool, regex * sizeof(ngx_rtmp_server_name_t));
    if (addr->regex == NULL) {
        return NGX_ERROR;
    }

    i = 0;

    for (s = 0; s < addr->servers.nelts; s++) {

        name = cscfp[s]->server_names.elts;

        for (n = 0; n < cscfp[s]->server_names.nelts; n++) {
            if (name[n].regex) {
                addr->regex[i++] = name[n];
            }
        }
    }

#endif

    return NGX_OK;

failed:

    ngx_destroy_pool(ha.temp_pool);

    return NGX_ERROR;
}


static int ngx_libc_cdecl
ngx_rtmp_cmp_dns_wildcards(const void *one, const void *two)
{
    ngx_hash_key_t  *first, *second;

    first = (ngx_hash_key_t *) one;
    second = (ngx_hash_key_t *) two;

    return ngx_dns_strcmp(first->key.data, second->key.data);
}


static ngx_int_t
ngx_rtmp_init_listening(ngx_conf_t *cf, ngx_rtmp_conf_port_t *port)
{
    ngx_uint_t                 i, last, bind_wildcard;
    ngx_listening_t           *ls;
    ngx_rtmp_port_t           *rport;
    ngx_rtmp_conf_addr_t      *addr;

    addr = port->addrs.elts;
    last = port->addrs.nelts;

    /*
     * If there is a binding to an "*:port" then we need to bind() to
     * the "*:port" only and ignore other implicit bindings.  The bindings
     * have been already sorted: explicit bindings are on the start, then
     * implicit bindings go, and wildcard binding is in the end.
     */

    if (addr[last - 1].opt.wildcard) {
        addr[last - 1].opt.bind = 1;
        bind_wildcard = 1;

    } else {
        bind_wildcard = 0;
    }

    i = 0;

    while (i < last) {

        if (bind_wildcard && !addr[i].opt.bind) {
            i++;
            continue;
        }

        ls = ngx_rtmp_add_listening(cf, &addr[i]);
        if (ls == NULL) {
            return NGX_ERROR;
        }

        rport = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_port_t));
        if (rport == NULL) {
            return NGX_ERROR;
        }

        /* used in ngx_rtmp_init_connection */
        ls->servers = rport;

        rport->naddrs = i + 1;

        switch (ls->sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
            case AF_INET6:
                if (ngx_rtmp_add_addrs6(cf, rport, addr) != NGX_OK) {
                    return NGX_ERROR;
                }
                break;
#endif
            default: /* AF_INET */
                if (ngx_rtmp_add_addrs(cf, rport, addr) != NGX_OK) {
                    return NGX_ERROR;
                }
                break;
        }

#if (nginx_version >= 1009001 && nginx_version <= 1015001)
        if (ngx_clone_listening(cf, ls) != NGX_OK) {
            return NGX_ERROR;
        }
#endif

        addr++;
        last--;
    }

    return NGX_OK;
}


static ngx_listening_t *
ngx_rtmp_add_listening(ngx_conf_t *cf, ngx_rtmp_conf_addr_t *addr)
{
    ngx_listening_t           *ls;
    ngx_rtmp_core_srv_conf_t  *cscf;

    ls = ngx_create_listening(cf, &addr->opt.sockaddr.sockaddr,
                              addr->opt.socklen);
    if (ls == NULL) {
        return NULL;
    }

    ls->addr_ntop = 1;

    ls->handler = ngx_rtmp_init_connection;

    cscf = addr->default_server;
    ls->pool_size = cscf->connection_pool_size;
    ls->post_accept_timeout = 60000;

    ls->logp = &cf->cycle->new_log;
    ls->log.data = &ls->addr_text;
    ls->log.handler = ngx_accept_log_error;

#if (NGX_WIN32)
    {
        ngx_iocp_conf_t  *iocpcf = NULL;

        if (ngx_get_conf(cf->cycle->conf_ctx, ngx_events_module)) {
            iocpcf = ngx_event_get_conf(cf->cycle->conf_ctx, ngx_iocp_module);
        }
        if (iocpcf && iocpcf->acceptex_read) {
            ls->post_accept_buffer_size = 1024;
        }
    }
#endif

    ls->backlog = addr->opt.backlog;
    ls->rcvbuf = addr->opt.rcvbuf;
    ls->sndbuf = addr->opt.sndbuf;

    ls->keepalive = addr->opt.so_keepalive;
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
    ls->keepidle = addr->opt.tcp_keepidle;
    ls->keepintvl = addr->opt.tcp_keepintvl;
    ls->keepcnt = addr->opt.tcp_keepcnt;
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
    ls->accept_filter = addr->opt.accept_filter;
#endif

#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
    ls->deferred_accept = addr->opt.deferred_accept;
#endif

#if (NGX_HAVE_INET6)
    ls->ipv6only = addr->opt.ipv6only;
#endif

#if (NGX_HAVE_SETFIB)
    ls->setfib = addr->opt.setfib;
#endif

#if (NGX_HAVE_TCP_FASTOPEN)
    ls->fastopen = addr->opt.fastopen;
#endif

#if (NGX_HAVE_REUSEPORT)
    ls->reuseport = addr->opt.reuseport;
#endif

    return ls;
}


static ngx_int_t
ngx_rtmp_add_addrs(ngx_conf_t *cf, ngx_rtmp_port_t *mport,
    ngx_rtmp_conf_addr_t *addr)
{
    ngx_uint_t                 i;
    ngx_rtmp_in_addr_t        *addrs;
    struct sockaddr_in        *sin;
    ngx_rtmp_virtual_names_t  *vn;

    u_char                    *p, buf[NGX_SOCKADDR_STRLEN];
    size_t                     len;

    mport->addrs = ngx_pcalloc(cf->pool,
                               mport->naddrs * sizeof(ngx_rtmp_in_addr_t));
    if (mport->addrs == NULL) {
        return NGX_ERROR;
    }

    addrs = mport->addrs;

    for (i = 0; i < mport->naddrs; i++) {

        sin = &addr[i].opt.sockaddr.sockaddr_in;
        addrs[i].addr = sin->sin_addr.s_addr;
        addrs[i].conf.default_server = addr[i].default_server;
        addrs[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;

        len = ngx_sock_ntop(&addr[i].opt.sockaddr.sockaddr,
#if (nginx_version >= 1005003)
                            addr[i].opt.socklen,
#endif
                            buf, NGX_SOCKADDR_STRLEN, 1);

        p = ngx_pcalloc(cf->pool, len);
        if (p == NULL) {
            return NGX_ERROR;
        }

        ngx_memcpy(p, buf, len);
        addrs[i].conf.addr_text.len = len;
        addrs[i].conf.addr_text.data = p;

        if (addr[i].hash.buckets == NULL
            && (addr[i].wc_head == NULL
                || addr[i].wc_head->hash.buckets == NULL)
            && (addr[i].wc_tail == NULL
                || addr[i].wc_tail->hash.buckets == NULL)
#if (NGX_PCRE)
            && addr[i].nregex == 0
#endif
            )
        {
            continue;
        }

        vn = ngx_palloc(cf->pool, sizeof(ngx_rtmp_virtual_names_t));
        if (vn == NULL) {
            return NGX_ERROR;
        }

        addrs[i].conf.virtual_names = vn;

        vn->names.hash = addr[i].hash;
        vn->names.wc_head = addr[i].wc_head;
        vn->names.wc_tail = addr[i].wc_tail;
#if (NGX_PCRE)
        vn->nregex = addr[i].nregex;
        vn->regex = addr[i].regex;
#endif
    }

    return NGX_OK;
}


#if (NGX_HAVE_INET6)

static ngx_int_t
ngx_rtmp_add_addrs6(ngx_conf_t *cf, ngx_rtmp_port_t *mport,
    ngx_rtmp_conf_addr_t *addr)
{
    ngx_uint_t                 i;
    ngx_rtmp_in6_addr_t       *addrs6;
    struct sockaddr_in6       *sin6;
    ngx_rtmp_virtual_names_t  *vn;

    u_char                    *p, buf[NGX_SOCKADDR_STRLEN];
    size_t                     len;

    mport->addrs = ngx_pcalloc(cf->pool,
                               mport->naddrs * sizeof(ngx_rtmp_in6_addr_t));
    if (mport->addrs == NULL) {
        return NGX_ERROR;
    }

    addrs6 = mport->addrs;

    for (i = 0; i < mport->naddrs; i++) {

        sin6 = &addr[i].opt.sockaddr.sockaddr_in6;
        addrs6[i].addr6 = sin6->sin6_addr;
        addrs6[i].conf.default_server = addr[i].default_server;
        addrs6[i].conf.proxy_protocol = addr[i].opt.proxy_protocol;

        len = ngx_sock_ntop(&addr[i].opt.sockaddr.sockaddr,
#if (nginx_version >= 1005003)
                            addr[i].opt.socklen,
#endif
                            buf, NGX_SOCKADDR_STRLEN, 1);

        p = ngx_pcalloc(cf->pool, len);
        if (p == NULL) {
            return NGX_ERROR;
        }

        ngx_memcpy(p, buf, len);
        addrs6[i].conf.addr_text.len = len;
        addrs6[i].conf.addr_text.data = p;

        if (addr[i].hash.buckets == NULL
            && (addr[i].wc_head == NULL
                || addr[i].wc_head->hash.buckets == NULL)
            && (addr[i].wc_tail == NULL
                || addr[i].wc_tail->hash.buckets == NULL)
#if (NGX_PCRE)
            && addr[i].nregex == 0
#endif
            )
        {
            continue;
        }

        vn = ngx_palloc(cf->pool, sizeof(ngx_rtmp_virtual_names_t));
        if (vn == NULL) {
            return NGX_ERROR;
        }

        addrs6[i].conf.virtual_names = vn;

        vn->names.hash = addr[i].hash;
        vn->names.wc_head = addr[i].wc_head;
        vn->names.wc_tail = addr[i].wc_tail;
#if (NGX_PCRE)
        vn->nregex = addr[i].nregex;
        vn->regex = addr[i].regex;
#endif
    }

    return NGX_OK;
}

#endif


static ngx_int_t
ngx_rtmp_cmp_conf_addrs(const void *one, const void *two)
{
    ngx_rtmp_conf_addr_t  *first, *second;

    first = (ngx_rtmp_conf_addr_t *) one;
    second = (ngx_rtmp_conf_addr_t *) two;

    if (first->opt.wildcard) {
        /* a wildcard address must be the last resort, shift it to the end */
        return 1;
    }

    if (second->opt.wildcard) {
        /* a wildcard address must be the last resort, shift it to the end */
        return -1;
    }

    if (first->opt.bind && !second->opt.bind) {
        /* shift explicit bind()ed addresses to the start */
        return -1;
    }

    if (!first->opt.bind && second->opt.bind) {
        /* shift explicit bind()ed addresses to the start */
        return 1;
    }

    /* do not sort by default */

    return 0;
}


ngx_int_t
ngx_rtmp_fire_event(ngx_rtmp_session_t *s, ngx_uint_t evt,
        ngx_rtmp_header_t *h, ngx_chain_t *in)
{
    ngx_rtmp_core_main_conf_t      *cmcf;
    ngx_array_t                    *ch;
    ngx_rtmp_handler_pt            *hh;
    size_t                          n;

    cmcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_core_module);

    ch = &cmcf->events[evt];
    hh = ch->elts;
    for(n = 0; n < ch->nelts; ++n, ++hh) {
        if (*hh && (*hh)(s, h, in) != NGX_OK) {
            return NGX_ERROR;
        }
    }
    return NGX_OK;
}


void *
ngx_rtmp_rmemcpy(void *dst, const void* src, size_t n)
{
    u_char     *d, *s;

    d = dst;
    s = (u_char*)src + n - 1;

    while(s >= (u_char*)src) {
        *d++ = *s--;
    }

    return dst;
}


static ngx_int_t
ngx_rtmp_init_process(ngx_cycle_t *cycle)
{
#if (nginx_version >= 1007005)
    ngx_queue_init(&ngx_rtmp_init_queue);
#endif
    return NGX_OK;
}


ngx_int_t
ngx_rtmp_process_virtual_host(ngx_rtmp_session_t *s)
{
    u_char     *p;
    ngx_int_t   rc;
    ngx_str_t   host;
    ngx_str_t   hschema, rschema, *schema;

    if (s->auto_pushed) {
        goto next;
    }

    hschema.data = (u_char *)"http://";
    hschema.len = ngx_strlen(hschema.data);

    rschema.data = (u_char *) "rtmp://";
    rschema.len = ngx_strlen(rschema.data);

    do {
        schema = &hschema;

        if (s->tc_url.len > schema->len
            && ngx_strncasecmp(s->tc_url.data, schema->data, schema->len) == 0)
        {
            break;
        }

        schema = &rschema;

        if (s->tc_url.len > schema->len
            && ngx_strncasecmp(s->tc_url.data, schema->data, schema->len) == 0)
        {
            break;
        }

        return NGX_ERROR;
    } while (0);

    s->host_start = s->tc_url.data + schema->len;

    p = ngx_strlchr(s->host_start, s->tc_url.data + s->tc_url.len, ':');
    if (p) {
        s->host_end = p;
    } else {
        p = ngx_strlchr(s->host_start, s->tc_url.data + s->tc_url.len, '/');
        s->host_end = p ? p : (s->host_start + s->tc_url.len - schema->len);
    }

next:
    host.len = s->host_end - s->host_start;
    host.data = s->host_start;

    rc = ngx_rtmp_validate_host(&host, s->connection->pool, 0);

    if (rc == NGX_DECLINED) {
        ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
                      "client send invalid host in request line");
        return NGX_ERROR;
    }

#if 0
    /* TODO: send error details to client */
    if (rc == NGX_ERROR) {
        return NGX_ERROR;
    }
#endif

    if (ngx_rtmp_set_virtual_server(s, &host) == NGX_ERROR) {
        return NGX_ERROR;
    }

    return NGX_OK;
}


ngx_int_t
ngx_rtmp_validate_host(ngx_str_t *host, ngx_pool_t *pool, ngx_uint_t alloc)
{
    u_char  *h, ch;
    size_t   i, dot_pos, host_len;

    enum {
        sw_usual = 0,
        sw_literal,
        sw_rest
    } state;

    dot_pos = host->len;
    host_len = host->len;

    h = host->data;

    state = sw_usual;

    for (i = 0; i < host->len; i++) {
        ch = h[i];

        switch (ch) {

        case '.':
            if (dot_pos == i - 1) {
                return NGX_DECLINED;
            }
            dot_pos = i;
            break;

        case ':':
            if (state == sw_usual) {
                host_len = i;
                state = sw_rest;
            }
            break;

        case '[':
            if (i == 0) {
                state = sw_literal;
            }
            break;

        case ']':
            if (state == sw_literal) {
                host_len = i + 1;
                state = sw_rest;
            }
            break;

        case '\0':
            return NGX_DECLINED;

        default:

            if (ngx_path_separator(ch)) {
                return NGX_DECLINED;
            }

            if (ch >= 'A' && ch <= 'Z') {
                alloc = 1;
            }

            break;
        }
    }

    if (dot_pos == host_len - 1) {
        host_len--;
    }

    if (host_len == 0) {
        return NGX_DECLINED;
    }

    if (alloc) {
        host->data = ngx_pnalloc(pool, host_len);
        if (host->data == NULL) {
            return NGX_ERROR;
        }

        ngx_strlow(host->data, h, host_len);
    }

    host->len = host_len;

    return NGX_OK;
}


ngx_int_t
ngx_rtmp_set_virtual_server(ngx_rtmp_session_t *s, ngx_str_t *host)
{
    ngx_int_t                  rc;
    ngx_int_t                  i;
    ngx_rtmp_connection_t     *rconn;
    ngx_rtmp_core_srv_conf_t  *cscf, *dcscf;
    ngx_rtmp_stream_t         *in_streams;

#if (NGX_SUPPRESS_WARN)
    cscf = NULL;
#endif

    rconn = s->rtmp_connection;

    rc = ngx_rtmp_find_virtual_server(s->connection,
                                      rconn->addr_conf->virtual_names,
                                      host, s, &cscf);

    if (rc == NGX_ERROR) {
        ngx_rtmp_finalize_session(s);
        return NGX_ERROR;
    }

    if (rc == NGX_DECLINED) {
        return NGX_OK;
    }

    dcscf = ngx_rtmp_get_module_srv_conf(s, ngx_rtmp_core_module);

    /* reinitialization */
    s->server_changed = 1;
    s->srv_conf = cscf->ctx->srv_conf;

    if (dcscf->out_queue != cscf->out_queue) {
        /* use new pool */
        s->out_temp_pool = ngx_create_pool(4096, s->connection->log);
        if (s->out_temp_pool == NULL) {
            ngx_rtmp_finalize_session(s);
            return NGX_ERROR;
        }

        /* save memory */
        ngx_destroy_pool(s->out_pool);
        s->out_pool = s->out_temp_pool;

        /* send not used yet, need not copy data */
        s->out = ngx_pcalloc(s->out_pool, sizeof(ngx_chain_t *)
                    * ((ngx_rtmp_core_srv_conf_t *)
                        cscf->ctx->srv_conf[ngx_rtmp_core_module
                            .ctx_index])->out_queue);

        s->out_queue = cscf->out_queue;
    }

    if (dcscf->max_streams != cscf->max_streams) {
        /* use new pool */
        s->in_streams_temp_pool = ngx_create_pool(4096, s->connection->log);
        if (s->in_streams_temp_pool == NULL) {
            ngx_rtmp_finalize_session(s);
            return NGX_ERROR;
        }

        in_streams = ngx_pcalloc(s->in_streams_temp_pool,
                           sizeof(ngx_rtmp_stream_t) * cscf->max_streams);
        if (in_streams == NULL) {
            ngx_rtmp_finalize_session(s);
            return NGX_ERROR;
        }

        /* copy data from s->in_streams to in_streams */
        ngx_memmove(in_streams, s->in_streams, sizeof(ngx_rtmp_stream_t)
                    * ngx_min(dcscf->max_streams, cscf->max_streams));

        if (dcscf->max_streams > cscf->max_streams) {
            for (i = cscf->max_streams; i < dcscf->max_streams; i++) {
                if (s->in_streams[i].hdr.csid) {
                    ngx_rtmp_finalize_session(s);
                    return NGX_ERROR;
                }
            }
        }

        s->in_streams = in_streams;

        /* save memory */
        ngx_destroy_pool(s->in_streams_pool);
        s->in_streams_pool = s->in_streams_temp_pool;
    }

    s->out_cork = cscf->out_cork;
    s->timeout = cscf->timeout;
    s->buflen = cscf->buflen;

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_find_virtual_server(ngx_connection_t *c,
    ngx_rtmp_virtual_names_t *virtual_names, ngx_str_t *host,
    ngx_rtmp_session_t *s, ngx_rtmp_core_srv_conf_t **cscfp)
{
    ngx_rtmp_core_srv_conf_t  *cscf;

    if (virtual_names == NULL) {
        return NGX_DECLINED;
    }

    cscf = ngx_hash_find_combined(&virtual_names->names,
                                  ngx_hash_key(host->data, host->len),
                                  host->data, host->len);

    if (cscf) {
        *cscfp = cscf;
        return NGX_OK;
    }

#if (NGX_PCRE)

    if (host->len && virtual_names->nregex) {
        ngx_int_t                n;
        ngx_uint_t               i;
        ngx_rtmp_server_name_t  *sn;

        sn = virtual_names->regex;

        for (i = 0; i < virtual_names->nregex; i++) {

            n = ngx_rtmp_regex_exec(s, sn[i].regex, host);

            if (n == NGX_DECLINED) {
                continue;
            }

            if (n == NGX_OK) {
                *cscfp = sn[i].server;
                return NGX_OK;
            }

            return NGX_ERROR;
        }
    }

#endif /* NGX_PCRE */

    return NGX_DECLINED;
}


#if (nginx_version <= 1011001)
in_port_t
ngx_inet_get_port(struct sockaddr *sa)
{
    struct sockaddr_in   *sin;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6  *sin6;
#endif

    switch (sa->sa_family) {

#if (NGX_HAVE_INET6)
    case AF_INET6:
        sin6 = (struct sockaddr_in6 *) sa;
        return ntohs(sin6->sin6_port);
#endif

#if (NGX_HAVE_UNIX_DOMAIN)
    case AF_UNIX:
        return 0;
#endif

    default: /* AF_INET */
        sin = (struct sockaddr_in *) sa;
        return ntohs(sin->sin_port);
    }
}


void
ngx_inet_set_port(struct sockaddr *sa, in_port_t port)
{
    struct sockaddr_in   *sin;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6  *sin6;
#endif

    switch (sa->sa_family) {

#if (NGX_HAVE_INET6)
    case AF_INET6:
        sin6 = (struct sockaddr_in6 *) sa;
        sin6->sin6_port = htons(port);
        break;
#endif

#if (NGX_HAVE_UNIX_DOMAIN)
    case AF_UNIX:
        break;
#endif

    default: /* AF_INET */
        sin = (struct sockaddr_in *) sa;
        sin->sin_port = htons(port);
        break;
    }
}
#endif