学步园

  
//打印 pcap_if_t 信息
  /* 将数字类型的IP地址转换成字符串类型的 */
#define IPTOSBUFFERS    12
    char *iptos(u_long in)
    {
        static char output[IPTOSBUFFERS][3*4+3+1];
        int nsize = sizeof(output);
        static short which;
        u_char *p;

        p = (u_char *)∈
        which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
        sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
        return output[which];
    }

     char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen)
    {                                                                    
        socklen_t sockaddrlen = 0;
#ifdef WIN32 
        sockaddrlen = sizeof(struct sockaddr_in6);
#else 
        sockaddrlen = sizeof(struct sockaddr_storage);
#endif 
        if(getnameinfo(sockaddr,sockaddrlen,address,addrlen,NULL,0,NI_NUMERICHOST)!= 0)
           address = NULL;
        return address;
    }

 bool ifprint(pcap_if_t *d)
    {
        pcap_addr_t *a;
        char ip6str[128];

        // 设备名称
        printf("\nadapter Name:%s\n",d->name);

        // 设备描述
        if(d->description) 
            printf("description:%s\n",d->description);

        // 回还地址
        printf("lookback state:%s\n",(d->flags & PCAP_IF_LOOPBACK)? "yes" : "no");


        // ip地址 
        for(a = d->addresses;a ;a =a->next)
        {
            printf("\tAddress Family: #%d\n",a->addr->sa_family);  
            switch(a->addr->sa_family)
            {
                case AF_INET:
                        if (a->addr)
                            printf("Ip address:%s\n",iptos(((struct sockaddr_in *)(a->addr))->sin_addr.s_addr));
                        if(a->broadaddr)
                            printf("broadcast address:%s\n",iptos(((struct sockaddr_in*)(a->broadaddr))->sin_addr.s_addr));
                        if(a->netmask)
                            printf("netmask address:%s\n",iptos(((struct sockaddr_in*)(a->broadaddr))->sin_addr.s_addr));
                        if(a->dstaddr)
                            printf("dstaddr address:%s\n",iptos(((struct sockaddr_in*)(a->dstaddr))->sin_addr.s_addr));
                    break;
                case AF_INET6:
                    printf("\tAddress Family Name: AF_INET6\n");
                    if (a->addr)
                        printf("\t address:%s\n",ip6tos(a->addr,ip6str,sizeof(ip6str)));
                    break;                                                   
                  
                default:
                    printf("\tAddress Family Name: Unknown\n");
                    break;
            } ;
        }
       
        return 0;
    }

iptos函数着实没有看明白那个宏的意思，有时间再慢慢研究。