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。
/*
* Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
* Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Politecnico di Torino, CACE Technologies
* nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "pcap.h"
#ifndef WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock.h>
#endif
// 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()
{
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 machinen"
"rpcap://hostname:port ==> lists interfaces in a remote machinen"
" (rpcapd daemon must be up and runningn"
" and it must accept 'null' authentication)n"
"file://foldername ==> lists all pcap files in the give foldernn"
"Enter your choice: ");
fgets(source, PCAP_ERRBUF_SIZE, stdin);
source[PCAP_ERRBUF_SIZE] = ' ';
/* 获得接口列表 */
if (pcap_findalldevs_ex(source, NULL, &alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs: %sn",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);
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("%sn",d->name);
/* 设备描述(Description) */
if (d->description)
printf("tDescription: %sn",d->description);
/* Loopback Address*/
printf("tLoopback: %sn",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");
/* IP addresses */
for(a=d->addresses;a;a=a->next) {
printf("tAddress Family: #%dn",a->addr->sa_family);
switch(a->addr->sa_family)
{
case AF_INET:
printf("tAddress Family Name: AF_INETn");
if (a->addr)
printf("tAddress: %sn",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
if (a->netmask)
printf("tNetmask: %sn",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
if (a->broadaddr)
printf("tBroadcast Address: %sn",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
if (a->dstaddr)
printf("tDestination Address: %sn",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
break;
case AF_INET6:
printf("tAddress Family Name: AF_INET6n");
if (a->addr)
printf("tAddress: %sn", ip6tos(a->addr, ip6str, sizeof(ip6str)));
break;
default:
printf("tAddress Family Name: Unknownn");
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;
}