一个用eXosip实现的UAC和UAS的例子调试成功 libexosip2

经过一段时间的学习,对sip总算有了一点认识,在学习过程中,遇到了太多的问题,郁闷过,惆怅过,但是一咬牙,还是过来了。令我感动的是,在网上遇到一些很热心的朋友,不厌其烦地给我以解惑,感谢他们,尤其是友善的大狗,呵呵,希望将来有一天他能看到这篇文章。

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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