由 pcap_findalldevs_ex() 傳回的每一個 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：
- 一個位址清單
- 一個掩碼清單 (each of which corresponds to an entry in the addresses list).
- 一個廣播位址清單 (each of which corresponds to an entry in the addresses list).
- 一個目的位址清單 (each of which corresponds to an entry in the addresses list).
另外，函數 pcap_findalldevs_ex() 還能 傳回遠端擴充卡資訊 和 一個位于所給的本地檔案夾的pcap檔案清單。
下面的範例使用了ifprint()函數來列印出 pcap_if 結構體中所有的内容。程式對每一個由 pcap_findalldevs_ex() 函數傳回的pcap_if，都調用ifprint()函數來實作列印。
1 #include "pcap.h"
2 #pragma comment(lib, "wpcap.lib")
3 #pragma comment(lib, "Packet.lib")
4 #pragma comment(lib, "wsock32.lib")
5
6
7
8 #ifndef WIN32
9 #include <sys/socket.h>
10 #include <netinet/in.h>
11 #else
12 #include <winsock.h>
13 #endif
14
15
16 // 函數原型
17 void ifprint(pcap_if_t *d);
18 char *iptos(u_long in);
19 char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen);
20
21
22 int main()
23 {
24 pcap_if_t *alldevs;
25 pcap_if_t *d;
26 char errbuf[PCAP_ERRBUF_SIZE+1];
27 char source[PCAP_ERRBUF_SIZE+1];
28
29 printf("Enter the device you want to list:\n"
30 "rpcap:// ==> lists interfaces in the local machine\n"
31 "rpcap://hostname:port ==> lists interfaces in a remote machine\n"
32 " (rpcapd daemon must be up and running\n"
33 " and it must accept \'null\' authentication)\n"
34 "file://foldername ==> lists all pcap files in the give folder\n\n"
35 "Enter your choice: ");
36
37 fgets(source, PCAP_ERRBUF_SIZE, stdin);
38 source[PCAP_ERRBUF_SIZE] = \'\0\';
39
40 /* 獲得接口清單 */
41 if (pcap_findalldevs_ex(source, NULL, &alldevs, errbuf) == -1)
42 {
43 fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
44 exit(1);
45 }
46
47 /* 掃描清單并列印每一項 */
48 for(d=alldevs;d;d=d->next)
49 {
50 ifprint(d);
51 }
52
53 pcap_freealldevs(alldevs);
54
55 return 1;
56 }
57
58
59
60 /* 列印所有可用資訊 */
61 void ifprint(pcap_if_t *d)
62 {
63 pcap_addr_t *a;
64 char ip6str[128];
65
66 /* 裝置名(Name) */
67 printf("%s\n",d->name);
68
69 /* 裝置描述(Description) */
70 if (d->description)
71 printf("\tDescription: %s\n",d->description);
72
73 /* Loopback Address*/
74 printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");
75
76 /* IP addresses */
77 for(a=d->addresses;a;a=a->next) {
78 printf("\tAddress Family: #%d\n",a->addr->sa_family);
79
80 switch(a->addr->sa_family)
81 {
82 case AF_INET:
83 printf("\tAddress Family Name: AF_INET\n");
84 if (a->addr)
85 printf("\tAddress: %s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
86 if (a->netmask)
87 printf("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
88 if (a->broadaddr)
89 printf("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
90 if (a->dstaddr)
91 printf("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
92 break;
93 /*
94 case AF_INET6:
95 printf("\tAddress Family Name: AF_INET6\n");
96 if (a->addr)
97 printf("\tAddress: %s\n", ip6tos(a->addr, ip6str, sizeof(ip6str)));
98 break;
99 */
100 default:
101 printf("\tAddress Family Name: Unknown\n");
102 break;
103 }
104 }
105 printf("\n");
106 }
107
108
109
110 /* 将數字類型的IP位址轉換成字元串類型的 */
111 #define IPTOSBUFFERS 12
112 char *iptos(u_long in)
113 {
114 static char output[IPTOSBUFFERS][3*4+3+1];
115 static short which;
116 u_char *p;
117
118 p = (u_char *)∈
119 which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
120 sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
121 return output[which];
122 }
123
124
125 /*
126 char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen)
127 {
128 socklen_t sockaddrlen;
129
130 #ifdef WIN32
131 sockaddrlen = sizeof(struct sockaddr_in6);
132 #else
133 sockaddrlen = sizeof(struct sockaddr_storage);
134 #endif
135
136
137 if(getnameinfo(sockaddr,
138 sockaddrlen,
139 address,
140 addrlen,
141 NULL,
142 0,
143 NI_NUMERICHOST) != 0) address = NULL;
144
145 return address;
146 }
147 */ 擷取已安裝裝置的進階資訊.c
結果：
此處隻能顯示電腦的ipv4的網卡資訊，不知道為什麼不能有ipv6的代碼時，不能編譯通過，不知道是包不支援，還是系統不支援；
int pcap_findalldevs_ex ( char * source,
struct pcap_rmtauth * auth,
pcap_if_t ** alldevs,
char * errbuf
) ·該函數請檢視前一篇；
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];
}; ·詳細的請看前面的socket程式設計；
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_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 );