sdp.c

linux下的sip voip程序

#include"sip_util.h"
#include"sdp.h"
#include"stack_if.h"

extern SAVE_MSG     g_SipMsg;
extern STACK_INFO   g_StackInfo;

/* SDPを侯喇する */
int make_SDP(char* sdp, char* username, char* addr,
             char* fqdn, char* protocol, int rtptype,
             int audiorate,int rtpport, char* o){

    /* v¨SDPのバ〖ジョン */
    set_v(sdp, "0");

    /* o¨セッション急侍攫鼠 */
    {
        if(o == NULL){
            char buff[MAX_FIELD];
            int time;
            long timestamp;
            struct timeval tv;
            struct timezone tz;

            if (-1 == gettimeofday(&tv, &tz)){
                return -1;
            }else{
                 time = tv.tv_sec*1000 + tv.tv_usec/1000;
            }

            timestamp = (long) (time & 0x7FFFFFFF);

            sprintf(buff,"%s %d %d IN %s %s", username, timestamp, timestamp, IP_TYPE, fqdn);
            set_o((sdp+strlen(sdp)), buff);
        }else{
            /* for OK msg. */
            char buf[MAX_FIELD]={""};
            char buf2[MAX_FIELD]={""};
            char *pchr1, *pchr2;

            strcpy(buf, o);
            pchr1=strstr(buf, " ");
            pchr2=strstr(buf, IP_TYPE);
            *(pchr2+strlen(IP_TYPE)) = 0;
            sprintf(buf2, "%s %s %s", username, pchr1+1, fqdn);
                    set_o((sdp+strlen(sdp)), buf2);
        }
    }

    /* s¨セッション叹 */
    set_s((sdp+strlen(sdp)), "Call");

    /* c¨コネクション攫鼠 */
    {
        char buff[MAX_FIELD];
        sprintf(buff, "IN %s %s", IP_TYPE, addr);
        set_c((sdp+strlen(sdp)), buff);
    }

    /* t¨セッションの倡幌、姜位箕癸 */
    {
        char buff[MAX_FIELD];
        sprintf(buff, "0 0");
        set_t((sdp+strlen(sdp)), buff);
    }

    /* m¨メディア硷侍、トランスポ〖トアドレス */
    {
        char buff[MAX_FIELD];
        sprintf(buff, "audio %d RTP/AVP %d", rtpport, rtptype);
        set_m((sdp+strlen(sdp)), buff);
    }

    /* a¨メディア掳拉 */
    {
        char buff[MAX_FIELD];
        sprintf(buff, "rtpmap:%d %s/%d", rtptype, protocol, audiorate);
        set_a((sdp+strlen(sdp)), buff);
    }
    return 0;
}

/* SDP攫鼠を肋年する簇眶 */
void set_v(char* sdp, char* buff){
    sprintf(sdp, "v=%s\r\n",buff);
}
void set_o(char* sdp, char* buff){
    sprintf(sdp, "o=%s\r\n",buff);
}
void set_s(char* sdp, char* buff){
    sprintf(sdp, "s=%s\r\n",buff);
}
void set_c(char* sdp, char* buff){
    sprintf(sdp, "c=%s\r\n",buff);
}
void set_t(char* sdp, char* buff){
    sprintf(sdp, "t=%s\r\n",buff);
}
void set_m(char* sdp, char* buff){
    sprintf(sdp, "m=%s\r\n",buff);
}
void set_a(char* sdp, char* buff){
    sprintf(sdp, "a=%s\r\n",buff);
}
void set_SDP(char* msg, char* buff){
    char* sp;
    sp = strrchr(msg, '\n');
    strcat(sp+1, buff);
}

/* SDP攫鼠を艰评する簇眶 */
void get_o(char* sdp, char* buff){
    char* sp;
    char* ep;
    sp = strstr(sdp, "o=");
    ep = strstr(sp, "\r\n");
    strncpy(buff, (sp+2), (strlen(sp+2)-strlen(ep)));
}
void get_c(char* sdp, char* buff){
        char* sp;
        char* ep;
        sp = strstr(sdp, "c=");
        ep = strstr(sp, "\r\n");
        strncpy(buff, (sp+2), (strlen(sp+2)-strlen(ep)));
}
void get_m(char* sdp, char* buff){
        char *sp, *ep;
        sp = strstr(sdp, "m=");
        ep = strstr(sp, "\r\n");
        strncpy(buff, (sp+2), (strlen(sp+2)-strlen(ep)));
}

/* RTP攫鼠を艰评する簇眶 */
int get_rtpaddr(char* sdp, char* rtp_addr){
    char* sp;
    char line[MAX_FIELD];
    if(rtp_addr == NULL){
        debug("Error!!get_rtpaddr failed.\n");
    }
    memset(line, 0, MAX_FIELD);
    memset(rtp_addr, 0, ADDR_SIZE);
    get_c(sdp, line);
    sp = strrchr(line, ' ');
    strncpy(rtp_addr, sp+1, strlen(sp+1));
}
int get_rtpport(char* sdp, char* rtpport){
    char* sp;
    char* ep;
    char line[MAX_FIELD];
    char* pchr;
    memset(line, 0, MAX_FIELD);
    get_m(sdp, line);
    sp = strchr(line, ' ');
    ep = strchr(sp+1, ' ');
    pchr = strncpy(rtpport, sp+1, (strlen(sp+1)-strlen(ep)));
    if(pchr ==NULL){
        debug("Error!!get_rtpport failed.\n");
    }
}