예제 #1
0
파일: udpread.c 프로젝트: YuanFanBin/learn
struct udpiphdr *udp_read(void)
{
    int                  len;
    char                *ptr;
    struct ether_header *eptr;

    for ( ; ; ) {
        // 从分组捕获设备获取下一个分组
        ptr = next_pcap(&len);

        switch (datalink) {
            case DLT_NULL:  // loopback header = 4 bytes
                return(udp_check(ptr + 4, len - 4));

            case DLT_EN10MB:
                eptr = (struct ether_header *) ptr;
                if (ntohs(eptr->ether_type) != ETHERTYPE_IP) {
                    err_quit("Ethernet type %x not IP", ntohs(eptr->ether_type));
                }
                return(udp_check(ptr + 14, len - 14));

            case DLT_SLIP:  // SLIP header = 24 bytes
                return(udp_check(ptr + 24, len - 24));

            case DLT_PPP:   // PPP header = 24 bytes
                return(udp_check(ptr + 24, len - 24));

            default:
                err_quit("unsupported datalink (%d)", datalink);
        }
    }
}
예제 #2
0
파일: test_cap.c 프로젝트: kuaikuai/httpcap
void capture_packet(pcap_t *pd)
{
    int len;
    char *ptr = NULL;
    for(;;)
    {
        ptr = next_pcap(&len, pd);
        if(ptr == NULL)
        {
            log_print(LOG_TYPE_ERROR,"ptr is NULL!\n");
            exit(1);
        }
        if (len < (ETHER_LEN + IP_LEN + UDP_LEN)) {
            log_print(LOG_TYPE_ERROR, "packet is too small\n");
            continue;
        }
        insert_packet(ptr, len);
    }
}
예제 #3
0
파일: ar.c 프로젝트: bhargavkathivarapu/CN
 void tcp_read(void)
 {
	 int len;
	 char *ptr;
	 struct ether_header *eptr;
	 for ( ; ; ) 
	 {
		 ptr = next_pcap(&len);
		 switch (datalink) 
		 {
		 
			 case DLT_NULL: /* loopback header = 4 bytes */
			 printf("case 1 packet\n");
			 return  ;
			//(check(ptr + 4, len - 4));
			 case DLT_EN10MB:
			 eptr = (struct ether_header *) ptr;
			 if (ntohs(eptr->ether_type) != ETHERTYPE_IP)
			 printf("Ethernet type %x not IP", ntohs(eptr->ether_type));
			 
			  printf("\n\ncase 2 packet IPHEADER\n");
			  check(ptr + 14, len - 14);
			 return ;
			 // (check(ptr + 14, len - 14));
			 case DLT_SLIP: /* SLIP header = 24 bytes */
			  printf("case 3 packet\n");
			 return ;
			 //(check(ptr + 24, len - 24));
			 case DLT_PPP: /* PPP header = 24 bytes */
			  printf("case 4 packet\n");
			 return ;
			 //(check(ptr + 24, len - 24));
			 default:
			 printf("unsupported datalink (%d)", datalink);
	 	}
 	}
 }