一个基于 osip 库的 UAC 和 UAS 的代码整理(转)

SIP协议UAC与UAS实现

最新推荐文章于 2023-03-27 13:59:15 发布

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最新推荐文章于 2023-03-27 13:59:15 发布

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本文链接：https://blog.youkuaiyun.com/zjf30366/article/details/84665666

本文介绍了一个基于osip和eXosip2库的简单SIP协议实现案例，包括UAC代理客户端与UAS代理服务器两端的代码整理及功能说明。

从网上搞了一个基于osip 库的 SIP 协议的简单的 UAC 代理客户端和 UAS 代理服务器端，并进行了编译连接，代码整理后如下：

----------- UAC 代理客户端的代码整理 ---------------

/** * 一个使用了 osip 和 eXosip 库的 UAC 代理客户端的演示程序 * * - 只是简单的演示了使用了 osip 和 eXosip2 库的 UAC 代理客户端的如下几个功能： * * i 发起呼叫 INVITE 请求 * * h 挂断会话 * * s 执行方法 INFO * * m 执行方法 MESSAGE * * 编译：g++ -I/usr/local/include -L/usr/local/lib ua_client.cpp -o ua_client -leXosip2 -losip2 -losipparser2 -lpthread * */ #include <osip2/osip_mt.h> #include <eXosip2/eXosip.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/types.h> #include <iostream> #include <string> using namespace std; 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; string strIdentity = "sip:136@133.37.55.136"; string strRegisterer = "sip:133.37.55.136:5060"; // server ip string strSrcCall = "sip:136@133.37.55.136"; string strDestCall = "sip:136@133.37.55.136:5060"; // server ip char command; char tmp[4096]; char localip[128]; string strHelp = string("\n\t--> 命令字符功能描述 <--\n\n") + "\t\tr 向服务器注册\n" + "\t\tc 取消注册\n" + "\t\ti 发起呼叫请求\n" + "\t\th 挂断\n" + "\t\tq 退出程序\n" + "\t\ts 执行方法 INFO\n" + "\t\tm 执行方法 MESSAGE\n" + "\t\te 帮助\n\n"; cout << strHelp; string strMsg; i = eXosip_init (); if (i != 0) { cout << "\t--> Couldn't initialize eXosip! <--\n"; return -1; } else { cout << "\t--> eXosip_init successfully! <-- \n\n"; } i = eXosip_listen_addr (IPPROTO_UDP, NULL, 5061, AF_INET, 0); if (i != 0) { eXosip_quit (); cerr << "\n\t--> Couldn't initialize transport layer! <-- \n\n"; return -1; } flag = 1; while (flag) { cout << "请输入一个命令字符：\t"; cin >> command; switch (command) { case 'r': cout << "\n\t--> This modal isn't commpleted! \n" << endl; break; case 'i': // 初始化的 INVITE 请求 i = eXosip_call_build_initial_invite (&invite, strDestCall.c_str(), strSrcCall.c_str(), NULL, "This is a call for a conversation"); if (i != 0) { cout << "\n --> 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 strMsg = string("v=0\r\n") + "o=anonymous 0 0 IN IP4 0.0.0.0\r\n" + "t=1 10\r\n" + "a=username:bluesea\r\n" + "a=password:123456\r\n"; osip_message_set_body (invite, strMsg.c_str(), strMsg.length()); osip_message_set_content_type (invite, "application/sdp"); // 这里使用了锁机制以保证同步 eXosip_lock (); i = eXosip_call_send_initial_invite (invite); eXosip_unlock (); flag1 = 1; while (flag1) { je = eXosip_event_wait (0, 200); if (je == NULL) { cout << "\n\t--> No response or the time is over! <--\n" << endl; break; } switch (je->type) { case EXOSIP_CALL_INVITE: cout << "\n\t--> a new invite reveived! <--\n" << endl; break; // announce processing by a remote app case EXOSIP_CALL_PROCEEDING: cout << "\n\t--> proceeding! <--\n" << endl; break; // announce ringback case EXOSIP_CALL_RINGING: cout << "\n\t--> ringing! <--\n" << "\n\tcall_id is " << je->cid << ", dialog_id is " << je->did << endl; break; // 收到请求，表示连接成功，下面发送回复确认 case EXOSIP_CALL_ANSWERED: cout << "\n\t--> ok! connected! <--\n" << endl; call_id = je->cid; dialog_id = je->did; cout << "\n\tcall_id is " << je->cid << ", dialog_id is " << je->did << endl; eXosip_call_build_ack (je->did, &ack); eXosip_call_send_ack (je->did, ack); flag1 = 0; break; case EXOSIP_CALL_CLOSED: cout << "\n\t--> the other sid closed! <--\n" << endl; break; case EXOSIP_CALL_ACK: cout << "\n\t--> ACK received! <--\n" << endl; break; default: cout << "\n\t--> other response!\n" <<endl; break; } eXosip_event_free (je); } break; case 'h': cout << "\n\t--> Holded ! \n" << endl; eXosip_lock (); eXosip_call_terminate (call_id, dialog_id); eXosip_unlock (); break; case 'c': cout << "\n\t--> This modal isn't commpleted! \n" << endl; break; case 's': // 传输 INFO 方法 eXosip_call_build_info (dialog_id, &info); snprintf (tmp , 4096, "hello,bluesea"); 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，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。 cout << "\n\t--> the mothed :MESSAGE \n" << endl; eXosip_message_build_request (&message, "MESSAGE", strDestCall.c_str(), strSrcCall.c_str(), NULL); strMsg = "message: hello bluesea!"; osip_message_set_body (message, strMsg.c_str(), strMsg.length()); // 假设格式是xml osip_message_set_content_type (message, "text/xml"); eXosip_message_send_request (message); break; case 'q': eXosip_quit (); cout << "\n\t--> Exit the setup! \n" << endl;; flag = 0; break; case 'e': cout << strHelp << endl; break; default: cout << "\n\t--> 不支持的命令 <--\n" << endl; break; } } return 0; }

----------- UAS 代理服务器端的代码整理 ---------------

/** * 一个使用了 osip 和 eXosip 库的 UAS 代理服务端的演示程序 * * - 只是简单的演示了使用了 osip 和 eXosip2 库的 UAS 代理服务端的如下几个功能： * * 编译：g++ -I/usr/local/include -L/usr/local/lib ua_server.cpp -o ua_server -leXosip2 -losip2 -losipparser2 -lpthread * */ #include <eXosip2/eXosip.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/types.h> #include <iostream> #include <fstream> #include <string> using namespace std; int main() { 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:136@133.37.55.136"; char *dest_call = "sip:136@133.37.55.136:5061"; //client ip/port char command; char tmp[4096]; char localip[128]; int pos = 0; // 初始化 sip i = eXosip_init (); if (i != 0) { cerr << "\n\t--> Can't initialize eXosip!\n"; return -1; } else { cout << "\n\t--> eXosip_init successfully!\n"; } i = eXosip_listen_addr (IPPROTO_UDP, NULL, 5060, AF_INET, 0); if (i != 0) { eXosip_quit (); cerr << "\n\t--> eXosip_listen_addr error! Couldn'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，继续 { continue; } switch (je->type) { case EXOSIP_MESSAGE_NEW: // 新的消息到来 cout << "\n\t*** EXOSIP_MESSAGE_NEW!\n" << endl; if (MSG_IS_MESSAGE (je->request)) // 如果接收到的消息类型是 MESSAGE { { osip_body_t *body; osip_message_get_body (je->request, 0, &body); cout << "I get the msg is: " << body->body << endl; } // 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: // INVITE 请求消息 // 得到接收到消息的具体信息 cout << "\n\tReceived a INVITE msg from " << je->request->req_uri->host << " : " << je->request->req_uri->port << ", username is " << je->request->req_uri->username << endl; // 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) { cout << "\n\t--> This request msg is invalid! Cann't response!\n" << endl; 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); cout << "\n\t--> send 200 over!" << endl; } 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 cout << "\n\t--> The INFO is :\n" ; while (!osip_list_eol ( &(remote_sdp->a_attributes), pos)) { sdp_attribute_t *at; //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 at = (sdp_attribute_t *) osip_list_get ( &(remote_sdp->a_attributes), pos); cout << "\n\t" << at->a_att_field << " : " << at->a_att_value << endl; pos ++; } break; case EXOSIP_CALL_ACK: cout << "\n\t--> ACK recieved!\n" << endl; // printf ("the cid is %s, did is %s\n", je->did, je->cid); break; case EXOSIP_CALL_CLOSED: cout << "\n\t--> the remote hold the session!\n" << endl; // 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); cout << "\n\t--> bye send 200 over!\n"; } break; case EXOSIP_CALL_MESSAGE_NEW: cout << "\n\t*** EXOSIP_CALL_MESSAGE_NEW\n" << endl; 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); cout << "the body is " << body->body << endl; } } break; default: cout << "\n\t--> Could not parse the msg!\n" << endl; } } return 0; }