WinPcap編程【3】獲取已安裝設備的高級信息

(獲取設備列表) 我們展示瞭如何獲取適配器的基本信息 (如設備的名稱和描述)。 事實上，WinPcap提供了其他更高級的信息。 特別需要指出的是， 由 pcap_findalldevs_ex() 返回的每一個 pcap_if 結構體，都包含一個 pcap_addr 結構體，這個結構體由如下元素組成：

• 一個地址列表
• 一個掩碼列表 (each of which corresponds to an entry in the addresses list).
• 一個廣播地址列表 (each of which corresponds to an entry in the addresses list).
• 一個目的地址列表 (each of which corresponds to an entry in the addresses list).

另外，函數 pcap_findalldevs_ex() 還能返回遠程適配器信息和一個位於所給的本地文件夾的pcap文件列表。

下面的範例使用了ifprint()函數來打印出 pcap_if 結構體中所有的內容。程序對每一個由 pcap_findalldevs_ex() 函數返回的pcap_if，都調用ifprint()函數來實現打印。

#include "pcap.h"

#ifndef WIN32
    #include <sys/socket.h>
    #include <netinet/in.h>
#else
    #include <winsock.h>
    #include <wspiapi.h>//getnameinfo
#endif

#pragma comment(lib,"ws2_32.lib")
#pragma comment(lib,"wpcap.lib")


// 函數原型
void ifprint(pcap_if_t *d);
char *iptos(u_long in);
char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen);


int main()//samp2()
{
  pcap_if_t *alldevs;
  pcap_if_t *d;
  char errbuf[PCAP_ERRBUF_SIZE+1];
  char source[PCAP_ERRBUF_SIZE+1];

  printf("Enter the device you want to list:/n"
            "rpcap://              ==> lists interfaces in the local machine/n"
            "rpcap://hostname:port ==> lists interfaces in a remote machine/n"
            "                          (rpcapd daemon must be up and running/n"
            "                           and it must accept 'null' authentication)/n"
            "file://foldername     ==> lists all pcap files in the give folder/n/n"
            "Enter your choice: ");

  fgets(source, PCAP_ERRBUF_SIZE, stdin);
  source[PCAP_ERRBUF_SIZE] = '/0';

  /* 獲得接口列表 */
  if (pcap_findalldevs_ex(source, NULL, &alldevs, errbuf) == -1)
  {
    fprintf(stderr,"Error in pcap_findalldevs: %s/n",errbuf);
    //exit(1);
  }

  /* 掃描列表並打印每一項 */
  for(d=alldevs;d;d=d->next)
  {
    ifprint(d);
  }

  pcap_freealldevs(alldevs);

 fgets(source, PCAP_ERRBUF_SIZE, stdin);

  return 1;
}



/* 打印所有可用信息 */
void ifprint(pcap_if_t *d)
{
  pcap_addr_t *a;
  char ip6str[128];

  /* 設備名(Name) */
  printf("%s/n",d->name);

  /* 設備描述(Description) */
  if (d->description)
    printf("/tDescription: %s/n",d->description);

  /* Loopback Address*/
  printf("/tLoopback: %s/n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");

  /* IP addresses */
  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:
        printf("/tAddress Family Name: AF_INET/n");
        if (a->addr)
          printf("/tAddress: %s/n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
        if (a->netmask)
          printf("/tNetmask: %s/n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
        if (a->broadaddr)
          printf("/tBroadcast Address: %s/n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
        if (a->dstaddr)
          printf("/tDestination 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("/tAddress: %s/n", ip6tos(a->addr, ip6str, sizeof(ip6str)));
       break;

      default:
        printf("/tAddress Family Name: Unknown/n");
        break;
    }
  }
  printf("/n");
}



/* 將數字類型的IP地址轉換成字符串類型的 */
#define IPTOSBUFFERS    12
char *iptos(u_long in)
{
    static char output[IPTOSBUFFERS][3*4+3+1];
    static short which;
    u_char *p;

    p = (u_char *)&in;
    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;

    #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;
}