今天开始了SIP开源库的学习，我选择了osip和eXosip，但是这两个库的编译使用有些麻烦，源码下来之后编译会出现很多问题，网上也没有找到完整的编译介绍，只能一步一步的找办法解决，最后终于编译成功！先大概记录下编译过程，后面还要再整理下。
期间还向CSDN论坛求助了下，但是还没有反应：http://bbs.csdn.net/topics/390499635?page=1#post-394866714
描述：error LNK2019: 无法解析的外部符号 _osip_transaction_set_naptr_record，该符号在函数 __eXosip_transaction_init 中被引用
原因：开源代码的库有些函数没有导出，需要手动在def文件中添加
解决方法：第二步的2,3两小步就是为了解决这个问题。
第一步，下载osip和eXosip
osip: http://ftp.twaren.net/Unix/NonGNU//osip/libosip2-3.6.0.tar.gz
eXosip： http://download.savannah.gnu.org/releases/exosip/libeXosip2-3.6.0.tar.gz
第二步，解压，编译osip：
1.进入libosip2-3.6.0platformvsnet目录，用VS2010直接打开osip.sln文件，项目自动转换
2.更改libosip2-3.6.0platformvsnetosip2.def 文件，在文件末尾追加
osip_transaction_set_naptr_record @138
3.更改libosip2-3.6.0platformvsnetosipparser2.def 文件，在文件末尾追加
osip_realloc @416
osip_strcasestr @417
__osip_uri_escape_userinfo @418
4.先编译osipparser2，再编译osip2，最后在libosip2-3.6.0platformvsnetDebug DLL下生成库文件：
osip2.lib
osip2.dll
osipparser2.lib
osipparser2.dll
第三步，解压，编译eXosip
进入libeXosip2-3.6.0platformvsnet目录，用VS2010直接打开eXosip.sln文件，项目自动转换：
1.将osip2.lib,osip2.dll,osipparser2.lib,osipparser2.dll拷贝到Debug目录下
2.C/C++ --> 预处理器 --> 预处理器定义: 删除HAVE_OPENSSL_SSL_H
3.C/C++ --> 常规 --> 附加包含目录: 将osip的头文件libosip2-3.6.0include包含进来
4.编译，生成eXosip.lib
第四步，新建UAC例子项目
1.链接器 --> 输入 --> 附加依赖项：增加静态库引用：Dnsapi.lib;Iphlpapi.lib;Ws2_32.lib;osip2.lib;osipparser2.lib;exosip.lib;
2.C/C++ -->常规 -->附加包含目录: 将osip和eXosip的头文件libosip2-3.6.0include、libeXosip2-3.6.0include包含进来
3.链接器 --> 常规 --> 附加库目录：将osip和eXosip的库包含进来，libeXosip2-3.6.0platformvsnetDebug
4.编译UAC代码：
#include <eXosip2/eXosip.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
int main(int argc,char *argv[])
{
struct eXosip_t *context_eXosip;
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;
char *identity="sip:140@127.0.0.1"; //UAC1，端口是15060
char *registar="sip:133@127.0.0.1:15061"; //UAS,端口是15061
char *source_call="sip:140@127.0.0.1";
char *dest_call="sip:133@127.0.0.1:15061";
//identify和register这一组地址是和source和destination地址相同的
//在这个例子中，uac和uas通信，则source就是自己的地址，而目的地址就是uac1的地址
char command;
char tmp[4096];
printf("r 向服务器注册
");
printf("c 取消注册
");
printf("i 发起呼叫请求
");
printf("h 挂断
");
printf("q 推出程序
");
printf("s 执行方法INFO
");
printf("m 执行方法MESSAGE
");
//初始化
i=eXosip_init();
if(i!=0)
{
printf("Couldn't initialize eXosip!
");
return -1;
}
else
{
printf("eXosip_init successfully!
");
}
//绑定uac自己的端口15060，并进行端口监听
i=eXosip_listen_addr(IPPROTO_UDP,NULL,15060,AF_INET,0);
if(i!=0)
{
eXosip_quit();
fprintf(stderr,"Couldn't initialize transport layer!
");
return -1;
}
flag=1;
while(flag)
{
//输入命令
printf("Please input the command:
");
scanf("%c",&command);
getchar();
switch(command)
{
case 'r':
printf("This modal is not completed!
");
break;
case 'i'://INVITE，发起呼叫请求
i=eXosip_call_build_initial_invite(&invite,dest_call,source_call,NULL,"This is a call for conversation");
if(i!=0)
{
printf("Initial INVITE failed!
");
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，
//但是只能有两列，比如帐户信息
//但是经过测试，格式vot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
"
"o=anonymous 0 0 IN IP4 0.0.0.0
"
"t=1 10
"
"a=username:rainfish
"
"a=password:123
");
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); //invite SIP INVITE message to send
eXosip_unlock();
//发送了INVITE消息，等待应答
flag1=1;
while(flag1)
{
je=eXosip_event_wait(0,200); //Wait for an eXosip event
//(超时时间秒，超时时间毫秒)
if(je==NULL)
{
printf("No response or the time is over!
");
break;
}
switch(je->type) //可能会到来的事件类型
{
case EXOSIP_CALL_INVITE: //收到一个INVITE请求
printf("a new invite received!
");
break;
case EXOSIP_CALL_PROCEEDING: //收到100 trying消息，表示请求正在处理中
printf("proceeding!
");
break;
case EXOSIP_CALL_RINGING: //收到180 Ringing应答，表示接收到INVITE请求的UAS正在向被叫用户振铃
printf("ringing!
");
printf("call_id is %d,dialog_id is %d
",je->cid,je->did);
break;
case EXOSIP_CALL_ANSWERED: //收到200 OK，表示请求已经被成功接受，用户应答
printf("ok!connected!
");
call_id=je->cid;
dialog_id=je->did;
printf("call_id is %d,dialog_id is %d
",je->cid,je->did);
//回送ack应答消息
eXosip_call_build_ack(je->did,&ack);
eXosip_call_send_ack(je->did,ack);
flag1=0; //推出While循环
break;
case EXOSIP_CALL_CLOSED: //a BYE was received for this call
printf("the other sid closed!
");
break;
case EXOSIP_CALL_ACK: //ACK received for 200ok to INVITE
printf("ACK received!
");
break;
default: //收到其他应答
printf("other response!
");
break;
}
eXosip_event_free(je); //Free ressource in an eXosip event
}
break;
case 'h': //挂断
printf("Holded!
");
eXosip_lock();
eXosip_call_terminate(call_id,dialog_id);
eXosip_unlock();
break;
case 'c':
printf("This modal is not commpleted!
");
break;
case 's': //传输INFO方法
eXosip_call_build_info(dialog_id,&info);
_snprintf(tmp,4096,"
This is a sip message(Method:INFO)");
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消息必须在建立INVITE的基础上传输
printf("the method : MESSAGE
");
eXosip_message_build_request(&message,"MESSAGE",dest_call,source_call,NULL);
//内容，方法， to ，from ，route
_snprintf(tmp,4096,"This is a sip message(Method:MESSAGE)");
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!
");
flag=0;
break;
}
}
return(0);
}
第五步，编译UAS项目：
与UAC同样的设置后，编译
# include <eXosip2/eXosip.h>
# include <stdio.h>
# include <stdlib.h>
# include <Winsock2.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:140@127.0.0.1";
char *dest_call = "sip:133@127.0.0.1:15060";//client ip
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!
");
return -1;
}
else
{
printf ("eXosip_init successfully!
");
}
i = eXosip_listen_addr (IPPROTO_UDP, NULL, 15061, AF_INET, 0);
if (i != 0)
{
eXosip_quit ();
fprintf (stderr, "eXosip_listen_addr error!
Couldn't initialize transport layer!
");
}
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!
");
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
", body->body);
//printf ("the cid is %s, did is %s/n", je->did, je->cid);
}
//按照规则，需要回复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
",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!
");
eXosip_call_send_answer (je->tid, 400, NULL);
}
else
{
snprintf (tmp, 4096,
"v=0
"
"o=anonymous 0 0 IN IP4 0.0.0.0
"
"t=1 10
"
"a=username:rainfish
"
"a=password:123
");
//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!
");
}
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 :
");
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
", 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!
");
// printf ("the cid is %s, did is %s/n", je->did, je->cid);
break;
case EXOSIP_CALL_CLOSED:
printf ("the remote hold the session!
");
// 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!
");
eXosip_call_send_answer (je->tid, 400, NULL);
}
else
{
eXosip_call_send_answer (je->tid, 200, answer);
printf ("bye send 200 over!
");
}
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
");
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
", body->body);
}
}
break;
default:
printf ("Could not parse the msg!
");
}
}
}
例子已经上传：http://download.csdn.net/detail/longlong530/5647749
运行示意图：
