爱华网一个用eXosip实现的UAC和UAS的例子调试成功 libexosip2
我是利用eXosip协议栈进行开发的，网上有一篇<一个简单的sip呼叫例子>,写的不错，但是好像有一些问题，而对于初学者来说，能拿到一个好的例子，对sip的理解可以到达事半功倍的效果。于是便把自己的写的例子拿出来，让大家参考一下，若有问题，欢迎指正。
只需把里面的IP地址改正、编译即可使用。
/******************************************
编译方法：
gcc xxx.c -o xxx -leXosip2
****************************************/
/*******************UAS*****************************************************
本文可以任意转载，但必须保留出处
作者：rainfish
网址：http://blog.csdn.net/bat603/
测试环境：eXosip3.0.1/redhat AS 4
***************************************************************************/
#include <eXosip2/eXosip.h>
#include <osip2/osip_mt.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
int
main (int argc, char *argv[])
{
eXosip_event_t *je = NULL;
osip_message_t *ack = NULL;
osip_message_t *invite = NULL;
osip_message_t *answer = NULL;
sdp_message_t *remote_sdp = NULL;
int call_id, dialog_id;
int i,j;
int id;
char *sour_call = "sip:133@192.168.0.133";
char *dest_call = "sip:140@192.168.0.140:5060";
char command;
char tmp[4096];
char localip[128];
int pos = 0;
//初始化sip
i = eXosip_init ();
if (i != 0)
{
printf ("Can't initialize eXosip!/n");
return -1;
}
else
{
printf ("eXosip_init successfully!/n");
}
i = eXosip_listen_addr (IPPROTO_UDP, NULL, 5060, AF_INET, 0);
if (i != 0)
{
eXosip_quit ();
fprintf (stderr, "eXosip_listen_addr error!/nCouldn't initialize transport layer!/n");
}
for(;;)
{
//侦听是否有消息到来
je = eXosip_event_wait (0,50);
//协议栈带有此语句,具体作用未知
eXosip_lock ();
eXosip_default_action (je);
eXosip_automatic_refresh ();
eXosip_unlock ();
if (je == NULL)//没有接收到消息
continue;
// printf ("the cid is %s, did is %s/n", je->did, je->cid);
switch (je->type)
{
case EXOSIP_MESSAGE_NEW://新的消息到来
printf (" EXOSIP_MESSAGE_NEW!/n");
if (MSG_IS_MESSAGE (je->request))//如果接受到的消息类型是MESSAGE
{
{
osip_body_t *body;
osip_message_get_body (je->request, 0, &body);
printf ("I get the msg is: %s/n", body->body);
//printf ("the cid is %s, did is %s/n", je->did, je->cid);
}
//按照规则，需要回复200 OK信息
eXosip_message_build_answer (je->tid, 200,&answer);
eXosip_message_send_answer (je->tid, 200,answer);
}
break;
case EXOSIP_CALL_INVITE:
//得到接收到消息的具体信息
printf ("Received a INVITE msg from %s:%s, UserName is %s, password is %s/n",je->request->req_uri->host,
je->request->req_uri->port, je->request->req_uri->username, je->request->req_uri->password);
//得到消息体,认为该消息就是SDP格式.
remote_sdp = eXosip_get_remote_sdp (je->did);
call_id = je->cid;
dialog_id = je->did;
eXosip_lock ();
eXosip_call_send_answer (je->tid, 180, NULL);
i = eXosip_call_build_answer (je->tid, 200, &answer);
if (i != 0)
{
printf ("This request msg is invalid!Cann't response!/n");
eXosip_call_send_answer (je->tid, 400, NULL);
}
else
{
snprintf (tmp, 4096,
"v=0/r/n"
"o=anonymous 0 0 IN IP4 0.0.0.0/r/n"
"t=1 10/r/n"
"a=username:rainfish/r/n"
"a=password:123/r/n");
//设置回复的SDP消息体,下一步计划分析消息体
//没有分析消息体，直接回复原来的消息，这一块做的不好。
osip_message_set_body (answer, tmp, strlen(tmp));
osip_message_set_content_type (answer, "application/sdp");
eXosip_call_send_answer (je->tid, 200, answer);
printf ("send 200 over!/n");
}
eXosip_unlock ();
//显示出在sdp消息体中的 attribute 的内容,里面计划存放我们的信息
printf ("the INFO is :/n");
while (!osip_list_eol (remote_sdp->a_attributes, pos))
{
sdp_attribute_t *at;
at = (sdp_attribute_t *) osip_list_get (remote_sdp->a_attributes, pos);
printf ("%s : %s/n", at->a_att_field, at->a_att_value);//这里解释了为什么在SDP消息体中属性a里面存放必须是两列
pos ++;
}
break;
case EXOSIP_CALL_ACK:
printf ("ACK recieved!/n");
// printf ("the cid is %s, did is %s/n", je->did, je->cid);
break;
case EXOSIP_CALL_CLOSED:
printf ("the remote hold the session!/n");
// eXosip_call_build_ack(dialog_id, &ack);
//eXosip_call_send_ack(dialog_id, ack);
i = eXosip_call_build_answer (je->tid, 200, &answer);
if (i != 0)
{
printf ("This request msg is invalid!Cann't response!/n");
eXosip_call_send_answer (je->tid, 400, NULL);
}
else
{
eXosip_call_send_answer (je->tid, 200, answer);
printf ("bye send 200 over!/n");
}
break;
case EXOSIP_CALL_MESSAGE_NEW://至于该类型和EXOSIP_MESSAGE_NEW的区别，源代码这么解释的
/*
/* request related events within calls (except INVITE) */
EXOSIP_CALL_MESSAGE_NEW, /**< announce new incoming request. */
/* response received for request outside calls */
EXOSIP_MESSAGE_NEW, /**< announce new incoming request. */
我也不是很明白，理解是： EXOSIP_CALL_MESSAGE_NEW是一个呼叫中的新的消息到来，比如ring trying都算，所以在接受到后必须判断
该消息类型，EXOSIP_MESSAGE_NEW而是表示不是呼叫内的消息到来。
该解释有不妥地方，仅供参考。
*/
printf(" EXOSIP_CALL_MESSAGE_NEW/n");
if (MSG_IS_INFO(je->request)//如果传输的是INFO方法
{
eXosip_lock ();
i = eXosip_call_build_answer (je->tid, 200, &answer);
if (i == 0)
{
eXosip_call_send_answer (je->tid, 200, answer);
}
eXosip_unlock ();
{
osip_body_t *body;
osip_message_get_body (je->request, 0, &body);
printf ("the body is %s/n", body->body);
}
}
break;
default:
printf ("Could not parse the msg!/n");
}
}
}
/*******************UAC*****************************************************
本文可以任意转载，但必须保留出处
作者：rainfish
网址：http://blog.csdn.net/bat603/
测试环境：eXosip3.0.1/redhat AS 4
***************************************************************************/
#include <eXosip2/eXosip.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
int
main (int argc, char *argv[])
{
eXosip_event_t *je;
osip_message_t *reg = NULL;
osip_message_t *invite = NULL;
osip_message_t *ack = NULL;
osip_message_t *info = NULL;
osip_message_t *message = NULL;
int call_id, dialog_id;
int i,flag;
int flag1 = 1;
int id;
char *identity = "sip:140@192.168.0.140";
char *registerer = "sip:192.168.0.133:5060";
char *source_call = "sip:140@192.168.0.140";
char *dest_call = "sip:133@192.168.0.133:5060";
char command;
char tmp[4096];
char localip[128];
printf("r 向服务器注册/n/n");
printf("c 取消注册/n/n");
printf("i 发起呼叫请求/n/n");
printf("h 挂断/n/n");
printf("q 退出程序/n/n");
printf("s 执行方法INFO/n/n");
printf("m 执行方法MESSAGE/n/n");
//初始化
i = eXosip_init ();
if (i != 0)
{
printf ("Couldn't initialize eXosip!/n");
return -1;
}
else
{
printf ("eXosip_init successfully!/n");
}
i = eXosip_listen_addr (IPPROTO_UDP, NULL, 5060, AF_INET, 0);
if (i != 0)
{
eXosip_quit ();
fprintf (stderr, "Couldn't initialize transport layer!/n");
return -1;
}
flag = 1;
while (flag)
{
printf ("please input the comand:/n");
scanf ("%c", &command);
getchar ();
switch (command)
{
case 'r':
printf ("This modal isn't commpleted!/n");
break;
case 'i':/* INVITE */
i = eXosip_call_build_initial_invite (&invite, dest_call, source_call, NULL, "This si a call for a conversation");
if (i != 0)
{
printf ("Intial INVITE failed!/n");
break;
}
//符合SDP格式,其中属性a是自定义格式,也就是说可以存放自己的信息,但是只能是两列,比如帐户信息
//但是经测试,格式:v o t必不可少,原因未知,估计是协议栈在传输时需要检查的
snprintf (tmp, 4096,
"v=0/r/n"
"o=anonymous 0 0 IN IP4 0.0.0.0/r/n"
"t=1 10/r/n"
"a=username:rainfish/r/n"
"a=password:123/r/n");
osip_message_set_body (invite, tmp, strlen(tmp));
osip_message_set_content_type (invite, "application/sdp");
eXosip_lock ();
i = eXosip_call_send_initial_invite (invite);
eXosip_unlock ();
flag1 = 1;
while (flag1)
{
je = eXosip_event_wait (0, 200);
if (je == NULL)
{
printf ("No response or the time is over!/n");
break;
}
switch (je->type)
{
case EXOSIP_CALL_INVITE:
printf ("a new invite reveived!/n");
break;
case EXOSIP_CALL_PROCEEDING:
printf ("proceeding!/n");
break;
case EXOSIP_CALL_RINGING:
printf ("ringing!/n");
// call_id = je->cid;
// dialog_id = je->did;
printf ("call_id is %d, dialog_id is %d /n", je->cid, je->did);
break;
case EXOSIP_CALL_ANSWERED:
printf ("ok! connected!/n");
call_id = je->cid;
dialog_id = je->did;
printf ("call_id is %d, dialog_id is %d /n", je->cid, je->did);
eXosip_call_build_ack (je->did, &ack);
eXosip_call_send_ack (je->did, ack);
flag1 = 0;
break;
case EXOSIP_CALL_CLOSED:
printf ("the other sid closed!/n");
break;
case EXOSIP_CALL_ACK:
printf ("ACK received!/n");
break;
default:
printf ("other response!/n");
break;
}
eXosip_event_free (je);
}
break;
case 'h':
printf ("Holded !/n");
eXosip_lock ();
eXosip_call_terminate (call_id, dialog_id);
eXosip_unlock ();
break;
case 'c':
printf ("This modal isn't commpleted!/n");
break;
case 's':
//传输INFO方法
eXosip_call_build_info (dialog_id, &info);
snprintf (tmp , 4096,
"hello,rainfish");
osip_message_set_body (info, tmp, strlen(tmp));
//格式可以任意设定,text/plain代表文本信息
osip_message_set_content_type (info, "text/plain");
eXosip_call_send_request (dialog_id, info);
break;
case 'm':
//传输MESSAGE方法,也就是即时消息，和INFO方法相比，我认为主要区别，是MESSAGE不用建立连接，直接传输信息，而INFO必须
//在建立INVITE的基础上传输。
printf ("the mothed :MESSAGE/n");
eXosip_message_build_request (&message, "MESSAGE", dest_call, source_call, NULL);
snprintf (tmp, 4096,
"hellor rainfish");
osip_message_set_body (message, tmp, strlen(tmp));
//假设格式是xml
osip_message_set_content_type (message, "text/xml");
eXosip_message_send_request (message);
break;
case 'q':
eXosip_quit ();
printf ("Exit the setup!/n");
flag = 0;
break;
}
}
return (0);
}
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