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FreeSwitch系列之注册流程处理

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我是靠谱客的博主 勤恳凉面，最近开发中收集的这篇文章主要介绍FreeSwitch系列之注册流程处理，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

业务流程

 

终端向服务器发送REGISTER请求

sip消息示例：

   REGISTER sip:39.108.105.163 SIP/2.0
   Max-Forwards: 10
   Record-Route: <sip:39.108.105.163:5070;r2=on;lr>
   Record-Route: <sip:39.108.105.163:5070;transport=tcp;r2=on;lr>
   Via: SIP/2.0/UDP 39.108.105.163:5070;branch=z9hG4bK7433.75da75a1.0;i=3081d387
   Via: SIP/2.0/TCP 172.18.41.221:6068;received=120.79.51.88;rport=6068;branch=z9hG4bK-10724-1-0
   From: "6500100032"<sip:6500100032@39.108.105.163:5070>;tag=1
   To: "6500100032"<sip:6500100032@39.108.105.163:5070>
   Call-ID: 1-10724@172.18.41.221
   CSeq: 1 REGISTER
   Contact: <sip:6500100032@120.79.51.88:6068;transport=TCP>
   Content-Length: 0
   Expires: 1800

服务器回复401，并给出WWW-Authenticate信息

fs处理过程描述:

sofia协议栈：
    tport :
        tport_recv_event
           =>tport_parse
             => tport_deliver
    nta :
        agent_recv_request
            => irq = incoming_find(agent, sip, sip->sip_via,..)
            => leg = agent->sa_default_leg
            => leg_recv
              => irq = incoming_create(agent, msg, sip, tport, tag)
              => status = incoming_callback(leg, irq, sip);
                =>leg->leg_callback(leg->leg_magic, leg, irq, sip);
           
    nua :
        nua_stack_process_request    
          =>sm = nua_register_server_methods
          =>nh = nua_stack_incoming_handle(nua, irq, sip, create_dialog)
            => nh = nh_create(nua, ..);
            => nua_stack_init_handle(nua, nh, NULL)
              =>nh->nh_soa = soa_clone(dnh->nh_soa, nua->nua_root, nh)
          => nua_registrar_server_preprocess(sr);
          => nua_server_report(sr)
            => nua_base_server_report
              => nua_stack_event(nua, nh, msg, e, status, phrase, tags)
     
    nua_stack :
      nua_stack_event
        => su_msg_send_to(sumsg, nua->nua_client, nua_application_event);
注册消息处理表
nua_server_methods_t const nua_register_server_methods = {
    SIP_METHOD_REGISTER,
    nua_i_register,     /* Event */
    {
        0,            /* Do not create dialog */
        0,            /* Initial request */
        0,            /* Not a target refresh request  */
        0,            /* Do not add Contact */
    },
    nua_base_server_init,
    nua_registrar_server_preprocess,
    nua_base_server_params,
    nua_base_server_respond,
    nua_registrar_server_report,
};

nua_stack_event处理流程，比较复杂，单独拎出来说明一下：

nua_stack.c:275 nua_stack_event() nua(0x29acea0): event i_register 100 Trying
/** @internal Send an event to the application. */
int nua_stack_event(nua_t *nua, nua_handle_t *nh, msg_t *msg, nua_event_t event, int status, char const *phrase, tagi_t const *tags)

   =>su_msg_send_to(sumsg, nua->nua_client, nua_application_event);  发给sofia主线程


/*# Receive event from protocol machine and hand it over to application */
sofia.c:2320 sofia_event_callback,event_name:nua_i_register,status=100,nua=0x214e600,profile=0x26cc100,nua_handle=0x29acea0,private=(nil)
static
void nua_application_event(nua_t *dummy, su_msg_r sumsg, nua_ee_data_t *ee)
   => nua->nua_callback((enum nua_event_e)e->e_event, ..)
     => sofia_event_callback
       => de = su_alloc(nh->nh_home, sizeof(*de));
       => sofia_queue_message(de);  发给sofia 消息处理线程

sofia.c:1411 entering our_sofia_event_callback,event=54(nua_i_register),phrase=Trying,nua=0x214e600,profile=0x26cc100,nh=0x29acea0,sofia_private=(nil)
our_sofia_event_callback
  => sofia_reg_handle_sip_i_register(nua, profile, nh, &sofia_private, sip, de, tags);
    => sofia_reg_handle_register_token
      => nua_respond


void nua_respond(nua_handle_t *nh,int status, char const *phrase,tag_type_t tag, tag_value_t value, ...)
  =>nua_signal(nh->nh_nua, nh, NULL, nua_r_respond,status, phrase, ta_tags(ta));
    =>su_msg_send_to(sumsg, nua->nua_server, nua_stack_signal); 发给sofia clone线程

Receiving events from client
nua_stack.c:577 nua_stack_signal() nua(0x29acea0): recv signal r_respond 401 Unauthorized
void nua_stack_signal(nua_t *nua, su_msg_r msg, nua_ee_data_t *ee)
  => nua_stack_respond(nua, nh, e->e_status, e->e_phrase, tags);
    => nua_server_params(sr, tags);
    => nua_server_respond(sr, tags);
      => incoming_reply
    => nua_server_report(sr);
      => nua_server_request_destroy

sip消息示例：

   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 39.108.105.163:5070;branch=z9hG4bK7433.75da75a1.0;i=3081d387;received=172.18.41.220
   Via: SIP/2.0/TCP 172.18.41.221:6068;received=120.79.51.88;rport=6068;branch=z9hG4bK-10724-1-0
   From: "6500100032"<sip:6500100032@39.108.105.163:5070>;tag=1
   To: "6500100032" <sip:6500100032@39.108.105.163:5070>;tag=3vv5rp607ayvQ
   Call-ID: 1-10724@172.18.41.221
   CSeq: 1 REGISTER
   User-Agent: FreeSWITCH
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: path, replaces
   WWW-Authenticate: Digest realm="39.108.105.163", nonce="40268d7e-e75a-4a78-b692-49e78cc18a4c", algorithm=MD5, qop="auth"
   Content-Length: 0

终端再次向服务器发送REGISTER请求，并携带认证信息

   REGISTER sip:6500100032@39.108.105.163:5070 SIP/2.0
   Max-Forwards: 10
   Record-Route: <sip:39.108.105.163:5070;r2=on;lr>
   Record-Route: <sip:39.108.105.163:5070;transport=tcp;r2=on;lr>
   Via: SIP/2.0/UDP 39.108.105.163:5070;branch=z9hG4bK4433.03c18c94.0;i=3081d387
   Via: SIP/2.0/TCP 172.18.41.221:6068;received=120.79.51.88;rport=6068
   From: "6500100032"<sip:6500100032@39.108.105.163:5070>;tag=1
   To: "6500100032"<sip:6500100032@39.108.105.163:5070>
   Call-ID: 1-10724@172.18.41.221
   CSeq: 2 REGISTER
   Contact: <sip:6500100032@120.79.51.88:6068;transport=TCP>
   Allow: INVITE, ACK, BYE, CANCEL, REGISTER
   Authorization: Digest username="6500100032",realm="39.108.105.163",cnonce="6b8b4567",nc=00000001,qop=auth,uri="sip:39.108.105.163:5070",nonce="40268d7e-e75a-4a78-b692-49e78cc18a4c",response="0ed61e004e0d9adf199e15476d5feb2a",algorithm=MD5
   Content-Length: 0
   Expires: 1800

 

服务器认证后回复200

fs处理过程描述:

类似上面的流程

   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 39.108.105.163:5070;branch=z9hG4bK4433.03c18c94.0;i=3081d387;received=172.18.41.220
   Via: SIP/2.0/TCP 172.18.41.221:6068;received=120.79.51.88;rport=6068
   From: "6500100032"<sip:6500100032@39.108.105.163:5070>;tag=1
   To: "6500100032" <sip:6500100032@39.108.105.163:5070>;tag=45NytHQ44KmFK
   Call-ID: 1-10724@172.18.41.221
   CSeq: 2 REGISTER
   Contact: <sip:6500100032@120.79.51.88:6068;transport=TCP>;expires=1800
   Date: Tue, 03 Nov 2020 10:41:33 GMT
   User-Agent: FreeSWITCH
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: path, replaces
   Content-Length: 0

最后

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