kamailio代码调试指南

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下面是一个kamailio进程启动的实例：

[root@localhost sbin]# ./kamctl ps { 
    "jsonrpc": "2.0", "result": [ { 
    "IDX": 0, "PID": 4919, "DSC": "main process - attendant" }, { 
    "IDX": 1, "PID": 4920, "DSC": "udp receiver child=0 sock=172.20.74.81:5060" }, { 
    "IDX": 2, "PID": 4921, "DSC": "udp receiver child=1 sock=172.20.74.81:5060" }, { 
    "IDX": 3, "PID": 4922, "DSC": "udp receiver child=2 sock=172.20.74.81:5060" }, { 
    "IDX": 4, "PID": 4923, "DSC": "udp receiver child=3 sock=172.20.74.81:5060" }, { 
    "IDX": 9, "PID": 4928, "DSC": "slow timer" }, { 
    "IDX": 10, "PID": 4929, "DSC": "timer" }, { 
    "IDX": 11, "PID": 4930, "DSC": "secondary timer" }, { 
    "IDX": 12, "PID": 4931, "DSC": "JSONRPCS FIFO" }, { 
    "IDX": 13, "PID": 4932, "DSC": "JSONRPCS DATAGRAM" }, { 
    "IDX": 14, "PID": 4933, "DSC": "USRLOC Timer" }, { 
    "IDX": 15, "PID": 4934, "DSC": "ctl handler" }, { 
    "IDX": 16, "PID": 4935, "DSC": "TIMER NH" }, { 
    "IDX": 17, "PID": 4936, "DSC": "tcp receiver (generic) child=0" }, { 
    "IDX": 18, "PID": 4937, "DSC": "tcp receiver (generic) child=1" }, { 
    "IDX": 19, "PID": 4938, "DSC": "tcp receiver (generic) child=2" }, { 
    "IDX": 20, "PID": 4939, "DSC": "tcp receiver (generic) child=3" }, { 
    "IDX": 21, "PID": 4940, "DSC": "tcp receiver (generic) child=4" }, { 
    "IDX": 25, "PID": 4944, "DSC": "tcp main process" } ], "id": 4947 } 

udp receiver和tcp receiver都是处理SIP消息的进程，包括kamailio.cfg配置中route段的代码都是在此进程中运行。为了方便调试，需要将kamailio配置为单进程运行模式，将kamailio.cfg中children=1

log_facility=LOG_LOCAL0 log_prefix="{ 
   $mt $hdr(CSeq) $ci} " /* number of SIP routing processes for each UDP socket * - value inherited by tcp_children and sctp_children when not set explicitely */ children=1 //默认为8 /* uncomment the next line to disable TCP (default on) */ # disable_tcp=yes /* number of SIP routing processes for all TCP/TLS sockets */ # tcp_children=8 

设置单进程模式后，运行如下

[root@localhost sbin]# ./kamctl ps { 
    "jsonrpc": "2.0", "result": [ { 
    "IDX": 0, "PID": 5036, "DSC": "main process - attendant" }, { 
    "IDX": 1, "PID": 5037, "DSC": "udp receiver child=0 sock=172.20.74.81:5060" }, { 
    "IDX": 2, "PID": 5038, "DSC": "slow timer" }, { 
    "IDX": 3, "PID": 5039, "DSC": "timer" }, { 
    "IDX": 4, "PID": 5040, "DSC": "secondary timer" }, { 
    "IDX": 5, "PID": 5041, "DSC": "JSONRPCS FIFO" }, { 
    "IDX": 6, "PID": 5042, "DSC": "JSONRPCS DATAGRAM" }, { 
    "IDX": 7, "PID": 5043, "DSC": "USRLOC Timer" }, { 
    "IDX": 8, "PID": 5044, "DSC": "ctl handler" }, { 
    "IDX": 9, "PID": 5045, "DSC": "TIMER NH" }, { 
    "IDX": 10, "PID": 5046, "DSC": "tcp receiver (generic) child=0" }, { 
    "IDX": 11, "PID": 5047, "DSC": "tcp main process" } ], "id": 5050 } 

(gdb) b auth_mod.c:854 Breakpoint 1 at 0x7fcba244f838: file auth_mod.c, line 854. (gdb) c Continuing. Breakpoint 1, w_pv_auth_check (msg=0x7fcba9af8838, realm=0x7fcba9aabc18 "\250\006\253\251\313\177", passwd=0x7fcba9aabd78 "", flags=0x7fcba9aabed8 "\320媩\313\177", checks=0x7fcba9aabf78 "0窩\313\177") at auth_mod.c:854 854 return pv_auth_check(msg, &srealm, &spasswd, vflags, vchecks); (gdb) bt #0 w_pv_auth_check (msg=0x7fcba9af8838, realm=0x7fcba9aabc18 "\250\006\253\251\313\177", passwd=0x7fcba9aabd78 "", flags=0x7fcba9aabed8 "\320媩\313\177", checks=0x7fcba9aabf78 "0窩\313\177") at auth_mod.c:854 #1 0x00000000005eccf5 in do_action (h=0x7ffea97a06b0, a=0x7fcba9aae2b0, msg=0x7fcba9af8838) at core/action.c:1104 #2 0x00000000005f9e52 in run_actions (h=0x7ffea97a06b0, a=0x7fcba9aae2b0, msg=0x7fcba9af8838) at core/action.c:1584 #3 0x00000000005fa4ce in run_actions_safe (h=0x7ffea97a2de0, a=0x7fcba9aae2b0, msg=0x7fcba9af8838) at core/action.c:1648 #4 0x000000000044b5bc in rval_get_int (h=0x7ffea97a2de0, msg=0x7fcba9af8838, i=0x7ffea97a0c24, rv=0x7fcba9aae980, cache=0x0) at core/rvalue.c:949 #5 0x00000000004500ed in rval_expr_eval_int (h=0x7ffea97a2de0, msg=0x7fcba9af8838, res=0x7ffea97a0c24, rve=0x7fcba9aae978) at core/rvalue.c:1947 #6 0x0000000000 in rval_expr_eval_int (h=0x7ffea97a2de0, msg=0x7fcba9af8838, res=0x7ffea97a119c, rve=0x7fcba9aaf0a8) at core/rvalue.c:1955 #7 0x00000000005ec580 in do_action (h=0x7ffea97a2de0, a=0x7fcba9ab0de0, msg=0x7fcba9af8838) at core/action.c:1055 #8 0x00000000005f9e52 in run_actions (h=0x7ffea97a2de0, a=0x7fcba9aaac40, msg=0x7fcba9af8838) at core/action.c:1584 #9 0x00000000005eca0e in do_action (h=0x7ffea97a2de0, a=0x7fcba9aafaf8, msg=0x7fcba9af8838) at core/action.c:1070 #10 0x00000000005f9e52 in run_actions (h=0x7ffea97a2de0, a=0x7fcba9aa8050, msg=0x7fcba9af8838) at core/action.c:1584 #11 0x00000000005eca0e in do_action (h=0x7ffea97a2de0, a=0x7fcba9ab1ed8, msg=0x7fcba9af8838) at core/action.c:1070 #12 0x00000000005f9e52 in run_actions (h=0x7ffea97a2de0, a=0x7fcba9aa61a0, msg=0x7fcba9af8838) at core/action.c:1584 #13 0x00000000005e91ef in do_action (h=0x7ffea97a2de0, a=0x7fcba9a730e8, msg=0x7fcba9af8838) at core/action.c:703 #14 0x00000000005f9e52 in run_actions (h=0x7ffea97a2de0, a=0x7fcba9a6ec38, msg=0x7fcba9af8838) at core/action.c:1584 #15 0x00000000005fa596 in run_top_route (a=0x7fcba9a6ec38, msg=0x7fcba9af8838, c=0x0) at core/action.c:1669 #16 0x0000000000602cfa in receive_msg ( buf=0xfc3160 "REGISTER sip:172.20.74.81;transport=tcp SIP/2.0\r\nVia: SIP/2.0/TCP 172.20.74.55:5060;branch=z9hG4bK481F610A00a14ac\r\nFrom: \"DESKTOP-C9B9OA2\" <sip:00008001@172.20.74.81>;tag=417D83E1-AC5A0620\r\nTo:"..., len=920, rcv_info=0x7fcb9e07dba0) at core/receive.c:515 #17 0x0000000000686e29 in receive_tcp_msg ( tcpbuf=0x7fcb9e07df28 "REGISTER sip:172.20.74.81;transport=tcp SIP/2.0\r\nVia: SIP/2.0/TCP 172.20.74.55:5060;branch=z9hG4bK481F610A00a14ac\r\nFrom: \"DESKTOP-C9B9OA2\" <sip:00008001@172.20.74.81>;tag=417D83E1-AC5A0620\r\nTo:"..., len=920, rcv_info=0x7fcb9e07dba0, con=0x7fcb9e07db88) at core/tcp_read.c:1413 #18 0x0000000000688f3a in tcp_read_req (con=0x7fcb9e07db88, bytes_read=0x7ffea97a3614, read_flags=0x7ffea97a360c) at core/tcp_read.c:1604 #19 0x000000000068d2f6 in handle_io (fm=0x7fcba9b02e10, events=1, idx=-1) at core/tcp_read.c:1855 #20 0x000000000067a394 in io_wait_loop_epoll (h=0xb6a960 <io_w>, t=2, repeat=0) at core/io_wait.h:1070 #21 0x000000000068ec91 in tcp_receive_loop (unix_sock=23) at core/tcp_read.c:1976 #22 0x0000000000537b1d in tcp_init_children (woneinit=0x7ffea97a3a9c) at core/tcp_main.c:5229 #23 0x000000000042df80 in main_loop () at main.c:1849 #24 0x00000000004377f9 in main (argc=5, argv=0x7ffea97a4188) at main.c:3078 (gdb) 

设置断后，再使用SIP终端进程注册，当服务器收到SIP消息，并运行到指定代码时，即可单步调试，同时查看调用堆栈，对位定位问题以及跟踪源码非常有帮助。