WinPcap编程【3】获取已安装设备的高级信息

(获取设备列表) 我们展示了如何获取适配器的基本信息 (如设备的名称和描述)。 事实上，WinPcap提供了其他更高级的信息。 特别需要指出的是， 由 pcap_findalldevs_ex() 返回的每一个 pcap_if 结构体，都包含一个 pcap_addr 结构体，这个结构体由如下元素组成：

一个地址列表

一个掩码列表 (each of which corresponds to an entry in the addresses list).

一个广播地址列表 (each of which corresponds to an entry in the addresses list).

一个目的地址列表 (each of which corresponds to an entry in the addresses list).

另外，函数 pcap_findalldevs_ex() 还能返回远程适配器信息和一个位于所给的本地文件夹的pcap文件列表。

下面的范例使用了ifprint()函数来打印出 pcap_if 结构体中所有的内容。程序对每一个由 pcap_findalldevs_ex() 函数返回的pcap_if，都调用ifprint()函数来实现打印。

#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")

// 函数原型
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';

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

/* 扫描列表并打印每一项 */
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];

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

/* 设备描述(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");
}

/* 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];
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;

#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;
}

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