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+];
char source[PCAP_ERRBUF_SIZE+]; 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) == -)
{
fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
exit();
} /* 扫描列表并打印每一项 */
for(d=alldevs;d;d=d->next)
{
ifprint(d);
} pcap_freealldevs(alldevs); return ;
} /* 打印所有可用信息 */
void ifprint(pcap_if_t *d)
{
pcap_addr_t *a;
char ip6str[]; /* 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][*++];
static short which;
u_char *p; p = (u_char *)∈
which = (which + == IPTOSBUFFERS ? : which + );
sprintf(output[which], "%d.%d.%d.%d", p[], p[], p[], p[]);
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[];
};
·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[];
};
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_b
- Address of the host formatted as four u_chars.
- S_un_w
- Address of the host formatted as two u_shorts.
- S_addr
- Address 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 );