Centos系统下，基于osip2+eXosip2的SIP开发

一、下载“osip2”和“eXosip2”源码

osip2：http://ftp.gnu.org/gnu/osip/

eXosip2: http://download.savannah.gnu.org/releases/exosip/

备注：从4.0.0版本开始，API接口函数和之前有一些改动，所以我这里为了向下兼容，还是用了3.x.x的最后一个发布版本3.6.0

下载文件为：

“libosip2-3.6.0.tar.gz”

“libeXosip2-3.6.0.tar.gz”

二、在Centos下编译安装

1、解压、编译并安装“osip2” ，指令如下：

tar -zxvf libosip2-3.6.0.tar.gz

cd libosip2-3.6.0

./configure --host=arm-hisiv100nptl-linux --target=arm-hisiv100nptl-linux --disable-static

make

make install

2、解压、编译并安装“eXosip2” ，指令如下：

tar -zxvf libeXosip2-3.6.0.tar.gz

cd libeXosip2-3.6.0

./configure --host=arm-hisiv100nptl-linux --target=arm-hisiv100nptl-linux --disable-static

make
make install

3、安装完后库的路径为：“/usr/local/lib”

三、编写简单的DEMO

1、编译与配置：

（1）代码中必须包含以下头文件

#include <eXosip2/eXosip.h>
#include <osip2/osip_mt.h>

（2）makefile

gcc demo.c -o demo -leXosip2 -I /usr/local/include -L /usr/local/lib -losip2 -losipparser2 -leXosip2

（3）指定库的路径

export LD_LIBRARY_PATH=/usr/local/lib/:$LD_LIBRARY_PATH

（4）运行并测试程序 
./demo

2、demo代码

//*******************UAS**************************************************//#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>intmain (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");    }    }}

#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);}