opensips源码分析
以下只分析记录关键路径和关键函数：
一、代码分析：
main.c
1、main()函数：
注册一些关键模块：
register_builtin_modules();
解析opensips.cfg配置文件
yyparse();
注：cfg脚本文件的解析是通过lex和yacc工具完成的，通过他们可以使opensips.cfg的执行速度达到c语言级别
枚举本服务器上的所有ip和本服务端口：
fix_all_socket_lists();
2、main_loop()函数：
进入到主要的主循环函数：
main_loop();
如果支持udp，则会启动这个循环：
udp_rcv_loop();
如果支持tcp，则首先调用tcp_init_children()初始化tcp子进程和父进程。
if (tcp_init_children(&chd_rank)<0) goto error;
此处很关键，opensips在此函数中，调用socketpair()来构造unix socket对，
分别分配给父进程和子进程，也就是说真正的sip服务，是由子进程来完成的，示例：
“客户端请求->TCP父进程->sendmsg/recvmsg传递socket->子进程接收客户端请求->子进程进行业务处理”
因此每个子进程都在以下这个函数中循环等待父进程转发的请求：
tcp_receive_loop(reader_fd[1]);
exit(-1);
其过程参考的日志如下：
Sep 24 18:30:04 [14405] DBG:core:handle_io: >>>>>>>> come in handle_io() in tcp_main file, fm->type=1, idx=-1
Sep 24 18:30:04 [14405] DBG:core:probe_max_sock_buff: getsockopt: snd is initially 262142
Sep 24 18:30:04 [14405] INFO:core:probe_max_sock_buff: using snd buffer of 255 kb
Sep 24 18:30:04 [14405] DBG:core:print_ip: tcpconn_new: new tcp connection to: 113.108.148.114
Sep 24 18:30:04 [14405] DBG:core:tcpconn_new: on port 13599, type 2
Sep 24 18:30:04 [14405] DBG:core:tcpconn_add: hashes: 366, 1
Sep 24 18:30:04 [14405] DBG:core:handle_new_connect: new connection: 0x2b0f383704c0 35 flags: 0002
Sep 24 18:30:04 [14405] DBG:core:send2child: to tcp child 0 0(14397), 0x2b0f383704c0
Sep 24 18:30:04 [14397] DBG:core:handle_io: received n=8 con=0x2b0f383704c0, fd=30
Sep 24 18:30:04 [14397] DBG:core:io_watch_add: io_watch_add(0x779b40, 30, 2, 0x2b0f383704c0), fd_no=1
Sep 24 18:30:04 [14397] DBG:core:tcp_read_req: >>>>>>>>> come in tcp_read_req function now !
Sep 24 18:30:04 [14397] DBG:core:tcp_read_req: content-length= 481
Sep 24 18:30:04 [14397] DBG:core:receive_msg: >>>> recv msg=
在初始化完父子进程后，则启动外部连接的监听循环：
tcp_main_loop()
tcp_main_loop()此函数中多次调用io_watch_add()，用于添加所需要的监听端口；
进入main_loop循环，在此循环中，根据支持的epoll/select/poll等方式来等待客户端连接
switch(io_h.poll_method){
以io_wait_loop_poll()为例继续分析：
在此函数中，循环检查所有的socket，当发现可读或可写之后 ，调用handle_io()函数处理。
while((handle_io(get_fd_map(h, h->fd_array[r].fd), r) > 0)
&& repeat);
tcp_main.c
当有新连接请求时，通过handle_io()函数中的handle_new_connect()处理：
tcp_main.c文件：
case F_SOCKINFO:
ret=handle_new_connect((struct socket_info*)fm->data);
在handle_new_connect()函数中，先接受客户端的请求，然后把此socket通过sendmsg方式，
发送给TCP子进程处理（请参考sendmsg/recvmsg来传递socket的方式 / SOL_SOCKET，参考上述章节部分描述）：
if(send2child(tcpconn)<0){
此时，父进程在tcp_receive_loop()函数的循环中捕获了这个请求，因此进入tcp_read.c文件中的tcp_read_req()函数，
tcp_read.c文件：
nfds--;
resp=tcp_read_req(con);
继续进入最重要的处理函数 receive_msg()：
receive.c文件：
} else if (receive_msg(req->start, req->parsed-req->start,
&con->rcv)<0) {
在receive_msg()函数中，首先解析客户端的请求消息：
if (parse_msg(buf,len, msg)!=0){
LM_ERR("parse_msg failed\n");
goto parse_error;
}
LM_DBG("After parse_msg...\n");
解析消息完成后，进入cfg配置文件的脚步处理过程，非常关键：
run_top_route(rlist[DEFAULT_RT].a, msg);
此函数接连调用action.c文件中的函数：run_actions(), run_action_list(), do_action()，
最后的do_action()函数，负责对脚本的逐步解析和处理，由下一章节专门处理。
在receive_msg()函数处理完成后，总会看到这行日志：
LM_DBG("cleaning up\n");
二、opensips.cfg的配置文件解析过程示例：
sip业务的处理逻辑，是由opensips.cfg配置文件后半部分的脚本来处理的，其中的
处理函数就是action.c文件中的do_action()，我在此函数开始部分增加了一行调试日志：
LM_DBG(">>>>> do action !!, type = %d\n", (unsigned char)a->type);
有助于分析每一步脚本的执行，其中if代表type=14, 执行module函数代表type=15，xlog代表type=73等等，
可以参考以下日志来理解这个脚本的控制：
Sep 23 19:41:51 [4580] DBG:core:receive_msg: After parse_msg...
Sep 23 19:41:51 [4580] DBG:core:receive_msg: preparing to run routing scripts...
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!mf_process_maxfwd_header("10")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (!mf_process_maxfwd_header("10")) {
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=100
Sep 23 19:41:51 [4580] DBG:core:parse_to: end of header reached, state=10
Sep 23 19:41:51 [4580] DBG:core:parse_to: display={}, ruri={sip:[email protected]}
Sep 23 19:41:51 [4580] DBG:core:get_hdr_field:
Sep 23 19:41:51 [4580] DBG:core:get_hdr_field: to body [
]
Sep 23 19:41:51 [4580] DBG:core:get_hdr_field: cseq
Sep 23 19:41:51 [4580] DBG:maxfwd:is_maxfwd_present: value = 70
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (has_totag()) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (has_totag()) {
Sep 23 19:41:51 [4580] DBG:uri:has_totag: no totag
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (is_method("CANCEL"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("CANCEL"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //t_check_trans();
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=78
Sep 23 19:41:51 [4580] DBG:tm:t_lookup_request: start searching: hash=43376, isACK=0
Sep 23 19:41:51 [4580] DBG:tm:matching_3261: RFC3261 transaction matching failed
Sep 23 19:41:51 [4580] DBG:tm:t_lookup_request: no transaction found
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!(method=="REGISTER") && from_uri==myself)
Sep 23 19:41:51 [4580] DBG:core:parse_to_param: tag=1829577472
Sep 23 19:41:51 [4580] DBG:core:parse_to: end of header reached, state=29
Sep 23 19:41:51 [4580] DBG:core:parse_to: display={}, ruri={sip:[email protected]}
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if host==us: 14==9 && [121.14.161.187] == [127.0.0.1]
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if port 5060 matches port 5060
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if host==us: 14==14 && [121.14.161.187] == [121.14.161.187]
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if port 5060 matches port 5060
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 // if (!proxy_authorize("", "subscriber")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 // if (!proxy_authorize("", "subscriber")) {
Sep 23 19:41:51 [4580] DBG:auth:check_nonce: comparing [4e7c709d000000115b6b5404037523279ba28306b57e2ac9] and [4e7c709d000000115b6b5404037523279ba28306b57e2ac9]
Sep 23 19:41:51 [4580] DBG:db_mysql:has_stmt_ctx: ctx found for subscriber
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_do_prepared_query: conn=0x7c8610 (tail=8146720) MC=0x7c6028
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_do_prepared_query: set values for the statement run
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_val2bind: added val (0): len=4; type=254; is_null=0
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_do_prepared_query: doing BIND_PARAM in...
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_do_prepared_query: prepared statement has 1 columns in result
Sep 23 19:41:51 [4580] DBG:core:db_new_result: allocate 48 bytes for result set at 0x7d7cc0
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: 1 columns returned from the query
Sep 23 19:41:51 [4580] DBG:core:db_allocate_columns: allocate 28 bytes for result columns at 0x7d7728
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: RES_NAMES(0x7d7730)[0]=[password]
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: use DB_STRING result type
Sep 23 19:41:51 [4580] DBG:core:db_allocate_rows: allocate 48 bytes for result rows and values at 0x7d79a0
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_str2val: converting STRING [max]
Sep 23 19:41:51 [4580] DBG:auth_db:get_ha1: HA1 string calculated: f213458fbed991c73058baa72389d249
Sep 23 19:41:51 [4580] DBG:auth:check_response: our result = 'e9dc8829d555d4f028ee2b3075ce9b3f'
Sep 23 19:41:51 [4580] DBG:auth:check_response: authorization is OK
Sep 23 19:41:51 [4580] DBG:auth:post_auth: nonce index= 17
Sep 23 19:41:51 [4580] DBG:core:db_free_columns: freeing result columns at 0x7d7728
Sep 23 19:41:51 [4580] DBG:core:db_free_rows: freeing 1 rows
Sep 23 19:41:51 [4580] DBG:core:db_free_row: freeing row values at 0x7d79b0
Sep 23 19:41:51 [4580] DBG:core:db_free_rows: freeing rows at 0x7d79a0
Sep 23 19:41:51 [4580] DBG:core:db_free_result: freeing result set at 0x7d7cc0
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!db_check_from()) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (!db_check_from()) {
Sep 23 19:41:51 [4580] DBG:uri:check_username: Digest username and URI username match
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //consume_credentials();
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (loose_route()) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (loose_route()) {
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=200
Sep 23 19:41:51 [4580] DBG:core:get_hdr_field: content_length=388
Sep 23 19:41:51 [4580] DBG:core:get_hdr_field: found end of header
Sep 23 19:41:51 [4580] DBG:rr:find_first_route: No Route headers found
Sep 23 19:41:51 [4580] DBG:rr:loose_route: There is no Route HF
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!is_method("REGISTER|MESSAGE"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("INVITE")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //record_route();
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (is_method("INVITE")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("INVITE")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 17 //setflag(1); # do accounting
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!uri==myself)
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if host==us: 14==9 && [121.14.161.187] == [127.0.0.1]
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if port 5060 matches port 5060
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if host==us: 14==14 && [121.14.161.187] == [121.14.161.187]
Sep 23 19:41:51 [4580] DBG:core:grep_sock_info: checking if port 5060 matches port 5060
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (is_method("PUBLISH"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("PUBLISH"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (is_method("REGISTER"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("REGISTER"))
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 // if ($rU==NULL) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 // alias_db_lookup("dbaliases");
Sep 23 19:41:51 [4580] DBG:core:db_new_result: allocate 48 bytes for result set at 0x7d92a0
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: 2 columns returned from the query
Sep 23 19:41:51 [4580] DBG:core:db_allocate_columns: allocate 56 bytes for result columns at 0x7d9308
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: RES_NAMES(0x7d9318)[0]=[username]
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: use DB_STRING result type
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: RES_NAMES(0x7d9328)[1]=[domain]
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_get_columns: use DB_STRING result type
Sep 23 19:41:51 [4580] DBG:db_mysql:db_mysql_convert_rows: no rows returned from the query
Sep 23 19:41:51 [4580] DBG:alias_db:alias_db_query: no alias found for R-URI
Sep 23 19:41:51 [4580] DBG:core:db_free_columns: freeing result columns at 0x7d9308
Sep 23 19:41:51 [4580] DBG:core:db_free_rows: freeing 0 rows
Sep 23 19:41:51 [4580] DBG:core:db_free_result: freeing result set at 0x7d92a0
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 73 // xlog("----------- come here before lookup -------------\n");
Sep 23 19:41:51 [4580] INFO:core:buf_init: initializing...
----------- come here before lookup -------------
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (!lookup("location","m")) {
Sep 23 19:41:51 [4580] DBG:registrar:lookup: setting as ruri
Sep 23 19:41:51 [4580] DBG:registrar:lookup: looking for branches
Sep 23 19:41:51 [4580] DBG:registrar:lookup: setting branch
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 73 // xlog("----------- come here before setflag -----------");
----------- come here before setflag -------------
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 17 //setflag(2);
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 6 // route(1); local function
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 73 //xlog("----------- come here in route 1 -------------\n");
----------- come here in route 1 -------------
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (is_method("INVITE")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (is_method("INVITE")) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //t_on_branch("2");
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //t_on_reply("2");
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //t_on_failure("1");
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 14 //if (!t_relay()) {
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 15 //if (!t_relay()) {
Sep 23 19:41:51 [4580] DBG:tm:t_newtran: transaction on entrance=(nil)
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=ffffffffffffffff
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=78
Sep 23 19:41:51 [4580] DBG:tm:t_lookup_request: start searching: hash=43376, isACK=0
Sep 23 19:41:51 [4580] DBG:tm:matching_3261: RFC3261 transaction matching failed
Sep 23 19:41:51 [4580] DBG:tm:t_lookup_request: no transaction found
Sep 23 19:41:51 [4580] DBG:tm:run_reqin_callbacks: trans=0x2b3767cd3a20, callback type 1, id 0 entered
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=78
Sep 23 19:41:51 [4580] DBG:core:parse_headers: flags=ffffffffffffffff
Sep 23 19:41:51 [4580] DBG:core:check_ip_address: params 113.108.148.114, 192.168.172.142, 0
Sep 23 19:41:51 [4580] DBG:core:_shm_resize: resize(0) called
Sep 23 19:41:51 [4580] DBG:core:tcp_send: tcp connection found (0x2b3767cc3880), acquiring fd
Sep 23 19:41:51 [4580] DBG:core:tcp_send: c= 0x2b3767cc3880, n=16
Sep 23 19:41:51 [4589] DBG:core:handle_ser_child: read response= 2b3767cc3880, 1, fd -1 from 16 (4580)
Sep 23 19:41:51 [4580] DBG:core:tcp_send: after receive_fd: c= 0x2b3767cc3880 n=8 fd=31
Sep 23 19:41:51 [4580] DBG:core:tcp_send: sending...
Sep 23 19:41:51 [4580] DBG:core:tcp_send: after write: c= 0x2b3767cc3880 n=308 fd=31
Sep 23 19:41:51 [4580] DBG:core:tcp_send: buf=
SIP/2.0 100 Giving a try
Via: SIP/2.0/TCP 192.168.172.142:1168;rport=6767;branch=z9hG4bK2121284540;received=113.108.148.114
From:
To:
Call-ID: 94874130
CSeq: 21 INVITE
Server: OpenSIPS (1.7.0-notls (x86_64/linux))
Content-Length: 0
Sep 23 19:41:51 [4580] DBG:tm:_reply_light: reply sent out. buf=0x7da3a0: SIP/2.0 1..., shmem=0x2b3767cd6fb8: SIP/2.0 1
Sep 23 19:41:51 [4580] DBG:tm:_reply_light: finished
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 73
new branch at sip:[email protected];line=dc4c7833fc0bc50
Sep 23 19:41:51 [4580] DBG:core:mk_proxy: >>>> doing DNS lookup...name=⊕}, port=0
Sep 23 19:41:51 [4580] DBG:core:build_req_buf_from_sip_req: id added: <;i=4>, rcv proto=2
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 73
new branch at sip:[email protected]:3879;line=dc4c7833fc0bc50
Sep 23 19:41:51 [4580] DBG:core:mk_proxy: >>>> doing DNS lookup...name=甫}, port=3879
Sep 23 19:41:51 [4580] DBG:core:build_req_buf_from_sip_req: id added: <;i=4>, rcv proto=2
Sep 23 19:41:51 [4580] DBG:tm:set_timer: relative timeout is 500000
Sep 23 19:41:51 [4580] DBG:tm:insert_timer_unsafe: [4]: 0x2b3767cd3c40 (447300000)
Sep 23 19:41:51 [4580] DBG:tm:set_timer: relative timeout is 30
Sep 23 19:41:51 [4580] DBG:tm:insert_timer_unsafe: [0]: 0x2b3767cd3c70 (476)
Sep 23 19:41:51 [4580] DBG:tm:set_timer: relative timeout is 500000
Sep 23 19:41:51 [4580] DBG:tm:insert_timer_unsafe: [4]: 0x2b3767cd3e40 (447300000)
Sep 23 19:41:51 [4580] DBG:tm:set_timer: relative timeout is 30
Sep 23 19:41:51 [4580] DBG:tm:insert_timer_unsafe: [0]: 0x2b3767cd3e70 (476)
Sep 23 19:41:51 [4580] DBG:tm:t_relay_to: new transaction fwd'ed
Sep 23 19:41:51 [4580] DBG:core:do_action: >>>>> do action !!, type = 42
Sep 23 19:41:51 [4580] DBG:tm:t_unref: UNREF_UNSAFE: [0x2b3767cd3a20] after is 0
Sep 23 19:41:51 [4580] DBG:core:destroy_avp_list: destroying list (nil)
Sep 23 19:41:51 [4580] DBG:core:receive_msg: cleaning up
三、我的配置文件参考如下，可以对应上述的日志进行分析：
#
# $Id: opensips.cfg 8141 2011-07-08 12:17:13Z vladut-paiu $
#
# OpenSIPS basic configuration script
# by Anca Vamanu
#
# Please refer to the Core CookBook at:
# http://www.opensips.org/Resources/DocsCookbooks
# for a explanation of possible statements, functions and parameters.
#
####### Global Parameters #########
debug=10
log_stderror=yes
log_facility=LOG_LOCAL0
fork=yes
children=4
#debug=6
#fork=no
#log_stderror=yes
#disable_tcp=yes
#disable_dns_blacklist=no
#dns_try_ipv6=yes
#auto_aliases=no
#disable_tls = no
#listen = tls:your_IP:5061
#tls_verify_server = 1
#tls_verify_client = 1
#tls_require_client_certificate = 0
#tls_method = TLSv1
#tls_certificate = "/home/max/opensips//etc/opensips/tls/user/user-cert.pem"
#tls_private_key = "/home/max/opensips//etc/opensips/tls/user/user-privkey.pem"
#tls_ca_list = "/home/max/opensips//etc/opensips/tls/user/user-calist.pem"
# default db_url to be used by modules requiring DB connection
db_default_url="mysql://opensips:[email protected]:8306/opensips"
port=5060
#listen=udp:192.168.1.2:5060
####### Modules Section ########
#set module path
mpath="/home/max/opensips//lib64/opensips/modules/"
loadmodule "db_mysql.so"
loadmodule "signaling.so"
loadmodule "sl.so"
loadmodule "tm.so"
loadmodule "rr.so"
loadmodule "maxfwd.so"
loadmodule "usrloc.so"
loadmodule "registrar.so"
loadmodule "textops.so"
loadmodule "mi_fifo.so"
loadmodule "uri.so"
loadmodule "acc.so"
loadmodule "auth.so"
loadmodule "auth_db.so"
loadmodule "alias_db.so"
loadmodule "domain.so"
#loadmodule "presence.so"
#loadmodule "presence_xml.so"
# ----------------- setting module-specific parameters ---------------
# ----- mi_fifo params -----
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
# ----- rr params -----
# do not append from tag to the RR (no need for this script)
modparam("rr", "append_fromtag", 0)
# ----- registrar params -----
#modparam("registrar", "max_contacts", 10)
# ----- usrloc params -----
#modparam("usrloc", "db_mode", 0)
#modparam("usrloc", "db_mode", 2)
#modparam("usrloc", "db_url",
# "mysql://opensips:[email protected]:8306/opensips")
# ----- uri params -----
modparam("uri", "use_uri_table", 0)
# ----- acc params -----
modparam("acc", "early_media", 1)
modparam("acc", "report_cancels", 1)
modparam("acc", "detect_direction", 0)
modparam("acc", "failed_transaction_flag", 3)
modparam("acc", "log_flag", 1)
modparam("acc", "log_missed_flag", 2)
modparam("acc", "db_flag", 1)
modparam("acc", "db_missed_flag", 2)
# ----- auth_db params -----
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")
modparam("auth_db", "db_url",
"mysql://opensips:[email protected]:8306/opensips")
modparam("auth_db", "load_credentials", "")
# ----- alias_db params -----
modparam("alias_db", "db_url",
"mysql://opensips:[email protected]:8306/opensips")
# ----- domain params -----
#modparam("domain", "db_url",
# "mysql://opensips:[email protected]:8306/opensips")
#modparam("domain", "db_mode", 1) # Use caching
# ----- multi-module params -----
#modparam("auth_db|usrloc|uri", "use_domain", 1)
# ----- presence params -----
#modparam("presence|presence_xml", "db_url",
# "mysql://opensips:[email protected]:8306/opensips")
#modparam("presence_xml", "force_active", 1)
#modparam("presence", "server_address", "sip:192.168.1.2:5060")
####### Routing Logic ########
# main request routing logic
route{
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
}
if (has_totag()) {
# sequential request withing a dialog should
# take the path determined by record-routing
if (loose_route()) {
if (is_method("BYE")) {
setflag(1); # do accounting ...
setflag(3); # ... even if the transaction fails
} else if (is_method("INVITE")) {
# even if in most of the cases is useless, do RR for
# re-INVITEs alos, as some buggy clients do change route set
# during the dialog.
record_route();
}
# route it out to whatever destination was set by loose_route()
# in $du (destination URI).
route(1);
} else {
##if (is_method("SUBSCRIBE") && $rd == "your.server.ip.address") {
## # in-dialog subscribe requests
## route(2);
## exit;
##}
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# non loose-route, but stateful ACK; must be an ACK after
# a 487 or e.g. 404 from upstream server
t_relay();
exit;
} else {
# ACK without matching transaction ->
# ignore and discard
exit;
}
}
sl_send_reply("404","Not here");
}
exit;
}
#initial requests
# CANCEL processing
if (is_method("CANCEL"))
{
if (t_check_trans())
t_relay();
exit;
}
t_check_trans();
# authenticate if from local subscriber (uncomment to enable auth)
# authenticate all initial non-REGISTER request that pretend to be
# generated by local subscriber (domain from FROM URI is local)
if (!(method=="REGISTER") && from_uri==myself)
##if (!(method=="REGISTER") && is_from_local())
{
if (!proxy_authorize("", "subscriber")) {
proxy_challenge("", "0");
exit;
}
if (!db_check_from()) {
sl_send_reply("403","Forbidden auth ID");
exit;
}
consume_credentials();
# caller authenticated
}
# preloaded route checking
if (loose_route()) {
xlog("L_ERR",
"Attempt to route with preloaded Route's [$fu/$tu/$ru/$ci]");
if (!is_method("ACK"))
sl_send_reply("403","Preload Route denied");
exit;
}
# record routing
if (!is_method("REGISTER|MESSAGE"))
record_route();
# account only INVITEs
if (is_method("INVITE")) {
setflag(1); # do accounting
}
if (!uri==myself)
## replace with following line if multi-domain support is used
##if (!is_uri_host_local())
{
append_hf("P-hint: outbound\r\n");
# if you have some interdomain connections via TLS
##if($rd=="tls_domain1.net") {
## t_relay("tls:domain1.net");
## exit;
##} else if($rd=="tls_domain2.net") {
## t_relay("tls:domain2.net");
## exit;
##}
route(1);
}
# requests for my domain
## uncomment this if you want to enable presence server
## and comment the next 'if' block
## NOTE: uncomment also the definition of route[2] from below
##if( is_method("PUBLISH|SUBSCRIBE"))
## route(2);
if (is_method("PUBLISH"))
{
sl_send_reply("503", "Service Unavailable");
exit;
}
if (is_method("REGISTER"))
{
# authenticate the REGISTER requests (uncomment to enable auth)
if (!www_authorize("", "subscriber"))
{
www_challenge("", "0");
exit;
}
if (!db_check_to())
{
sl_send_reply("403","Forbidden auth ID");
exit;
}
if (!save("location"))
sl_reply_error();
exit;
}
if ($rU==NULL) {
# request with no Username in RURI
sl_send_reply("484","Address Incomplete");
exit;
}
# apply DB based aliases (uncomment to enable)
alias_db_lookup("dbaliases");
xlog("----------- come here before lookup -------------\n");
# do lookup with method filtering
if (!lookup("location","m")) {
switch ($retcode) {
case -1:
case -3:
xlog("----------- come here before t_newtran -------------\n");
t_newtran();
t_reply("404", "Not Found");
exit;
case -2:
sl_send_reply("405", "Method Not Allowed");
exit;
}
}
xlog("----------- come here before setflag -------------\n");
# when routing via usrloc, log the missed calls also
setflag(2);
route(1);
}
route[1] {
xlog("----------- come here in route 1 -------------\n");
# for INVITEs enable some additional helper routes
if (is_method("INVITE")) {
t_on_branch("2");
t_on_reply("2");
t_on_failure("1");
}
if (!t_relay()) {
sl_reply_error();
};
exit;
}
# Presence route
#route[2]
#{
# if (!t_newtran())
# {
# sl_reply_error();
# exit;
# };
#
# if(is_method("PUBLISH"))
# {
# handle_publish();
# }
# else
# if( is_method("SUBSCRIBE"))
# {
# handle_subscribe();
# }
#
# exit;
#}
branch_route[2] {
xlog("new branch at $ru\n");
}
onreply_route[2] {
xlog("incoming reply\n");
}
failure_route[1] {
if (t_was_cancelled()) {
exit;
}
# uncomment the following lines if you want to block client
# redirect based on 3xx replies.
##if (t_check_status("3[0-9][0-9]")) {
##t_reply("404","Not found");
## exit;
##}
# uncomment the following lines if you want to redirect the failed
# calls to a different new destination
##if (t_check_status("486|408")) {
## sethostport("192.168.2.100:5060");
## # do not set the missed call flag again
## t_relay();
##}
}
注册
if (!www_authorize("", "subscriber"))
{
www_challenge("", "0");
exit;
}
上面的代码是利用mysql来进行认证的。如果认证不成功，就直接退出，不进行下一步的操作。当然你也可以将这部分注释掉，这样无论是谁都可以注册成功了。
注册成功后，会调用
if (!save("location"))
sl_reply_error();
实际上是把一些注册时候的sip信息写到location数据表中。如果你配置了
modparam("usrloc", "db_mode", 2)
modparam("usrloc", "db_url",
"mysql://openser:openserrw@localhost/openser")
的话，会在opensips数据库中的location表中看到这些sip信息。
3.2nat配置
if (nat_uac_test("19")) {
if (method=="REGISTER") {
fix_nated_register();
} else {
fix_nated_contact();
}
setflag(5);
}
上面的代码检测你是否在nat后面。那如果你不在nat后面，但你呼叫的另一方在nat后面，那你怎么知道呢？
if (is_method("REGISTER"))
{
if(isflagset(5))
{
setbflag("6");
# uncomment next line to do SIP NAT pinging
## setbflag("7");
}
if (!save("location"))
sl_reply_error();
exit;
}
看看上面中的setbflag("6"),这非常关键，这是一个nat标识，调用save("location")后会把这个标识保存到location表中。（在内存中，不在数据库里）当你呼叫对方时，调用lookup("location")就可以判断对方是否是在nat后面了。