winPcap_4_获取已安装设备的高级信息

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"
#pragma comment(lib, "wpcap.lib")
#pragma comment(lib, "Packet.lib")
#pragma comment(lib, "wsock32.lib")

#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 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);

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;
}
*/

获取已安装设备的高级信息.c

　　结果：



此处只能显示电脑的ipv4的网卡信息，不知道为什么不能有ipv6的代码时，不能编译通过，不知道是包不支持，还是系统不支持；

int pcap_findalldevs_ex  ( char *  source,
struct pcap_rmtauth *  auth,
pcap_if_t **  alldevs,
char *  errbuf
)

　　·该函数请查看前一篇；

struct pcap_rmtauth{
　　int    type
//Type of the authentication required.
　　char *    username
//Zero-terminated string containing the username that has to be used on the remote machine for authentication.
　　char *    password
//Zero-terminated string containing the password that has to be used on the remote machine for authentication.
};

typedef struct pcap_if pcap_if_t;

struct  pcap_if {
pcap_if *    next
//if not NULL, a pointer to the next element in the list; NULL for the last element of the list
char *    name
//a pointer to a string giving a name for the device to pass to pcap_open_live()
char *    description
//if not NULL, a pointer to a string giving a human-readable description of the device
pcap_addr *    addresses
//a pointer to the first element of a list of addresses for the interface
u_int    flags
//PCAP_IF_ interface flags. Currently the only possible flag is PCAP_IF_LOOPBACK, that is set if the interface is a loopback interface.
};

typedef struct pcap_addr pcap_addr_t;

struct  pcap_addr
{
pcap_addr *    next
//if not NULL, a pointer to the next element in the list; NULL for the last element of the list
sockaddr *    addr
//a pointer to a struct sockaddr containing an address
sockaddr *    netmask
//if not NULL, a pointer to a struct sockaddr that contains the netmask corresponding to the address pointed to by addr.
sockaddr *    broadaddr
//if not NULL, a pointer to a struct sockaddr that contains the broadcast address corre­ sponding to the address pointed to by addr; may be null if the interface doesn't support broadcasts
sockaddr *    dstaddr
//if not NULL, a pointer to a struct sockaddr that contains the destination address corre­ sponding to the address pointed to by addr; may be null if the interface isn't a point- to-point interface
};

struct sockaddr {
unsigned short sa_family;
char           sa_data[14];
};

　　·详细的请看前面的socket编程；

struct sockaddr_in{
short                 sin_family;
unsigned short        sin_port;
struct   in_addr      sin_addr;
char                  sin_zero[8];
};

in_addr

The in_addr structure represents a host by its Internet address.

struct in_addr {
union {
struct { u_char s_b1,s_b2,s_b3,s_b4; }   S_un_b;
struct { u_short s_w1,s_w2; }            S_un_w;
u_long                                   S_addr;
} S_un;
};

Members

S_un_bAddress of the host formatted as four u_chars.S_un_wAddress of the host formatted as two u_shorts.S_addrAddress of the host formatted as a u_long.

fgets, fgetws

Get a string from a stream.

char *fgets( char *string, int n, FILE *stream );

wchar_t *fgetws( wchar_t *string, int n, FILE *stream );