WinPcap笔记2之获取已经安装设备的高级信息

  1 #include "pcap.h"
  2 
  3 #ifndef WIN32
  4 #include <sys/socket.h>
  5 #include <netinet/in.h>
  6 #else
  7 #include <winsock.h>
  8 #endif
  9 
 10 
 11 // 函数原型
 12 void ifprint(pcap_if_t *d);
 13 char *iptos(u_long in);
 14 char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen);
 15 
 16 
 17 int main()
 18 {
 19     pcap_if_t *alldevs;
 20     pcap_if_t *d;
 21     char errbuf[PCAP_ERRBUF_SIZE + 1];
 22     char source[PCAP_ERRBUF_SIZE + 1];
 23 
 24     printf("Enter the device you want to list:\n"
 25         "rpcap://              ==> lists interfaces in the local machine\n"
 26         "rpcap://hostname:port ==> lists interfaces in a remote machine\n"
 27         "                          (rpcapd daemon must be up and running\n"
 28         "                           and it must accept ‘null‘ authentication)\n"
 29         "file://foldername     ==> lists all pcap files in the give folder\n\n"
 30         "Enter your choice: ");
 31 
 32     fgets(source, PCAP_ERRBUF_SIZE, stdin);//输入上面提示内容 需要的查看内容
 33     source[PCAP_ERRBUF_SIZE] = ‘\0‘;
 34 
 35     /* 获得接口列表 */
 36     if (pcap_findalldevs_ex(source, NULL, &alldevs, errbuf) == -1)
 37     {
 38         fprintf(stderr, "Error in pcap_findalldevs: %s\n", errbuf);
 39         exit(1);
 40     }
 41 
 42     /* 扫描列表并打印每一项 */
 43     for (d = alldevs; d; d = d->next)
 44     {
 45         ifprint(d);
 46     }
 47 
 48     pcap_freealldevs(alldevs);
 49 
 50     return 1;
 51 }
 52 
 53 
 54 
 55 /* 打印所有可用信息 */
 56 void ifprint(pcap_if_t *d)
 57 {
 58     pcap_addr_t *a;
 59     char ip6str[128];
 60 
 61     /* 设备名(Name) */
 62     printf("%s\n", d->name);
 63 
 64     /* 设备描述(Description) */
 65     if (d->description)
 66         printf("\tDescription: %s\n", d->description);
 67 
 68     /* Loopback Address*/
 69     printf("\tLoopback: %s\n", (d->flags & PCAP_IF_LOOPBACK) ? "yes" : "no");
 70 
 71     /* IP addresses */
 72     for (a = d->addresses; a; a = a->next) {
 73         printf("\tAddress Family: #%d\n", a->addr->sa_family);
 74 
 75         switch (a->addr->sa_family)
 76         {
 77         case AF_INET:
 78             printf("\tAddress Family Name: AF_INET\n");
 79             if (a->addr)
 80                 printf("\tAddress: %s\n", iptos(((struct sockaddr_in *)a->addr)->sin_addr.S_un.S_addr));
 81             if (a->netmask)
 82                 printf("\tNetmask: %s\n", iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
 83             if (a->broadaddr)
 84                 printf("\tBroadcast Address: %s\n", iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
 85             if (a->dstaddr)
 86                 printf("\tDestination Address: %s\n", iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
 87             break;
 88 
 89         case AF_INET6:
 90             printf("\tAddress Family Name: AF_INET6\n");
 91             if (a->addr)
 92                 printf("\tAddress: %s\n", ip6tos(a->addr, ip6str, sizeof(ip6str)));
 93             break;
 94 
 95         default:
 96             printf("\tAddress Family Name: Unknown\n");
 97             break;
 98         }
 99     }
100     printf("\n");
101 
102     getchar();
103 }
104 
105 
106 
107 /* 将数字类型的IP地址转换成字符串类型的 */
108 #define IPTOSBUFFERS    12
109 char *iptos(u_long in)
110 {
111     static char output[IPTOSBUFFERS][3 * 4 + 3 + 1];//3*4个数组+3个点+一个空字符结束
112     static short which;
113     u_char *p;
114 
115     p = (u_char *)&in;
116     //如果转换IP的个数大于总Buffer数,就从0开始. 
117         which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
118     sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
119     return output[which];
120 }
121 
122 char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen)
123 {
124     socklen_t sockaddrlen;
125 
126 #ifdef WIN32
127     sockaddrlen = sizeof(struct sockaddr_in6);
128 #else
129     sockaddrlen = sizeof(struct sockaddr_storage);
130 #endif
131 
132 
133     if (getnameinfo(sockaddr,
134         sockaddrlen,
135         address,
136         addrlen,
137         NULL,
138         0,
139         NI_NUMERICHOST) != 0) address = NULL;
140 
141     return address;
142 }