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：
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libosip2-3.6.0\platform\vsnet目录，用VS2010直接打开osip.sln文件，项目自动转换 2.更改libosip2-3.6.0\platform\vsnet\osip2.def 文件，在文件末尾追加 osip_transaction_set_naptr_record @138
3.更改libosip2-3.6.0\platform\vsnet\osipparser2.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libosip2-3.6.0\platform\vsnet\Debug 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libeXosip2-3.6.0\platform\vsnet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libosip2-3.6.0\include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libosip2-3.6.0\include、libeXosip2-3.6.0\include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，libeXosip2-3.6.0\platform\vsnet\Debug 4.编译UAC代码：
#include#include #include #include 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\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 推出程序\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"); } //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!\n"); return -1; } flag=1; while(flag) { //输入命令 printf("Please input the command:\n"); scanf("%c",&command); getchar(); switch(command) { case 'r': printf("This modal is not completed!\n"); 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!\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\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); //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!\n"); 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!\n"); break; case EXOSIP_CALL_PROCEEDING: //收到100 trying消息，表示请求正在处理中 printf("proceeding!\n"); 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!\n"); printf("call_id is %d,dialog_id is %d \n",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!\n"); call_id=je->cid; dialog_id=je->did; printf("call_id is %d,dialog_id is %d \n",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!\n"); break; case EXOSIP_CALL_ACK: //ACK received for 200ok to INVITE printf("ACK received!\n"); break; default: //收到其他应答 printf("other response!\n"); break; } eXosip_event_free(je); //Free ressource in an eXosip event } break; case 'h': //挂断 printf("Holded!\n"); eXosip_lock(); eXosip_call_terminate(call_id,dialog_id); eXosip_unlock(); break; case 'c': printf("This modal is not commpleted!\n"); break; case 's': //传输INFO方法 eXosip_call_build_info(dialog_id,&info); _snprintf(tmp,4096,"\nThis 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\n"); 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!\n"); flag=0; break; } } return(0);}
第五步，编译UAS项目：
与UAC同样的设置后，编译
# include# include # include # include 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!\n"); return -1;} else{ printf ("eXosip_init successfully!\n");} i = eXosip_listen_addr (IPPROTO_UDP, NULL, 15061, 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");}}}
例子已经上传：
运行示意图：
