exosip2 的簡單使用

http://blog.chinaunix.net/u/29227/showart_326021.html
今天從網上搞了一個基於osip 庫的 SIP 協議的簡單的 UAC 代理客戶端和 UAS 代理服務器端，並進行了編譯連接，代碼整理後如下：
 
    ----------- UAC 代理客戶端的代碼整理 ---------------
 

/**
 * 一個使用了 osip 和 eXosip 庫的 UAC 代理客戶端的演示程序
 *
 * - 只是簡單的演示了使用了 osip 和 eXosip2 庫的 UAC 代理客戶端的如下幾個功能：
 * * i 發起呼叫 INVITE 請求
 * * h 掛斷會話
 * * s 執行方法 INFO
 * * m 執行方法 MESSAGE
 *
 * 編 譯：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:[email protected]";
    string strRegisterer = "sip:133.37.55.136:5060"; // server ip

    string strSrcCall = "sip:[email protected]";
    string strDestCall = "sip:[email protected]: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 向服務器註冊\n"
                        + "\t\tc 取消註冊\n"
                        + "\t\ti 發起呼叫請求\n"
                        + "\t\th 掛斷\n"
                        + "\t\tq 退出程序\n"
                        + "\t\ts 執行方法 INFO\n"
                        + "\t\tm 執行方法 MESSAGE\n"
                        + "\t\te 幫助\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 << "請輸入一個命令字符：\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 請求
            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, 其中屬性 a 是自定義格式,也就是說可以存放自己的信息, 
            // 但是隻能是兩列,比如帳戶信息
            // 但是經測試,格式: v o t必不可少,原因未知,估計是協議棧在傳輸時需要檢查的

            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");
      
            // 這裏使用了鎖機制以保證同步
            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;

                // 收到請求，表示連接成功，下面發送回覆確認
                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':
            // 傳輸 INFO 方法
            eXosip_call_build_info (dialog_id, &info);
            
            snprintf (tmp , 4096, "hello,bluesea");
            osip_message_set_body (info, tmp, strlen(tmp));

            // 格式可以任意設定, 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':
            // 傳輸 MESSAGE方法,也就是即時消息，
            // 和 INFO 方法相比，主要區別，是 MESSAGE 不用建立連接，直接傳輸信息，
            // 而 INFO 必須在建立 INVITE 的基礎上傳輸。
            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());
      
            // 假設格式是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 代理服務器端的代碼整理 ---------------

/**
 * 一個使用了 osip 和 eXosip 庫的 UAS 代理服務端的演示程序
 *
 * - 只是簡單的演示了使用了 osip 和 eXosip2 庫的 UAS 代理服務端的如下幾個功能：
 *
 * 編 譯：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:[email protected]";
    char *dest_call = "sip:[email protected]: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(;;)
    {
        // 偵聽是否有消息到來
        je = eXosip_event_wait (0, 50);

        // 協議棧帶有此語句,具體作用未知
        eXosip_lock ();
        eXosip_default_action (je);
        eXosip_automatic_refresh ();
        eXosip_unlock ();

        if (je == NULL) // 沒有接收到消息，繼續
        {
            continue;
        }

        switch (je->type)
        {
        case EXOSIP_MESSAGE_NEW: // 新的消息到來
            cout << "\n\t*** EXOSIP_MESSAGE_NEW!\n" << endl;

            if (MSG_IS_MESSAGE (je->request)) // 如果接收到的消息類型是 MESSAGE
            {
                {
                    osip_body_t *body;
                    osip_message_get_body (je->request, 0, &body);
                    cout << "I get the msg is: " << body->body << endl;
                }

                // 按照規則，需要回復 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 請求消息
            // 得到接收到消息的具體信息
            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;

            // 得到消息體,認爲該消息就是 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");
            
                // 設置回覆的SDP消息體,下一步計劃分析消息體
                // 沒有分析消息體，直接回復原來的消息，這一塊做的不好。
                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 ();
        
            // 顯示出在 sdp 消息體中的 attribute 的內容,裏面計劃存放我們的信息
            cout << "\n\t--> The INFO is :\n" ;
            while (!osip_list_eol ( &(remote_sdp->a_attributes), pos))
            {
                sdp_attribute_t *at;
            
                //這裏解釋了爲什麼在SDP消息體中屬性a裏面存放必須是兩列
                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) ) // 如果傳輸的是 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;
}