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<hr><p align="left"><small>发信人: cpu (奔腾的心), 信区: Socket <br>
标 题: 小工具arp.c <br>
发信站: 华南网木棉站 (Wed Apr 28 13:17:17 1999), 转信 <br>
简单的例子, 发arp request, 收arp reply <br>
linux的packet socket的确好用 ... 有空写个manual出来... <br>
cc -o arp arp.c <br>
./arp ip [interface] (注: linux自己有个arp) <br>
interface不指定时默认为eth0 <br>
例子: 我的IP是172.18.86.13, 解析172.18.86.25的mac地址 <br>
[root@digger tools.src]# ./arp 172.18.86.25 <br>
request mac 00:60:97:a5:50:d8, request IP 172.18.86.13 <br>
replied mac 00:10:4b:0e:0e:e7, replied IP 172.18.86.25 <br>
--cut here -- <br>
/* arp.c, by digger, get the mac address of the hosts in ur subnet */ <br>
#include <stdio.h> <br>
#include <string.h> <br>
#include <netdb.h> <br>
#include <arpa/inet.h> <br>
#include <netinet/in.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <sys/ioctl.h> <br>
#include <net/if.h> <br>
#include <net/if_arp.h> <br>
#include <net/ethernet.h> <br>
#include <signal.h> <br>
#include <netinet/ip.h> <br>
#define DEF_INTERFACE "eth0" <br>
#define PACKET_SIZE 2048 <br>
struct myarphdr { <br>
/* ehter header from /net/ethernet.h */ <br>
u_char ether_dhost[ETH_ALEN]; /* destination eth addr */ <br>
u_char ether_shost[ETH_ALEN]; /* source ether addr */ <br>
u_short ether_type; /* packet type ID field */ <br>
/* arp or rarp header from /net/if_arp.h */ <br>
u_short ar_hrd; /* Format of hardware address. */ <br>
u_short ar_pro; /* Format of protocol address. */ <br>
u_char ar_hln; /* Length of hardware address. */ <br>
u_char ar_pln; /* Length of protocol address. */ <br>
u_short ar_op; /* ARP opcode (command). */ <br>
u_char ar_sha[ETH_ALEN]; /* Sender hardware address. */ <br>
u_char ar_sip[4]; /* Sender IP address. */ <br>
u_char ar_tha[ETH_ALEN]; /* Target hardware address. */ <br>
u_char ar_tip[4]; /* Target IP address. */ <br>
u_char padding[18]; /* padding */ <br>
}; <br>
struct in_addr myself, dstaddr; <br>
int fd_arp; /* socket fd for receive packets */ <br>
struct ifreq ifr; /* ifr structure */ <br>
main(int argc, char *argv[]) <br>
{ <br>
char device[32]; /* ethernet device name */ <br>
struct sockaddr from, to; <br>
int fromlen; <br>
struct sockaddr_in * sin_ptr; <br>
u_char * ptr; <br>
int n; <br>
u_char buf[PACKET_SIZE]; /* buffer for send and recv <br>
*/ <br>
struct myarphdr * arp = (struct myarphdr *)buf; <br>
if (argc < 2) { <br>
printf("usage: %s ip [interface]\n", argv[0]); <br>
exit(0); <br>
} <br>
if (argc >= 3) { <br>
strncpy(device, argv[2], 32); <br>
device[31] = '\0'; <br>
} else <br>
strcpy(device, DEF_INTERFACE); <br>
dstaddr.s_addr = inet_addr(argv[1]); <br>
if ((fd_arp = socket(AF_INET, SOCK_PACKET, htons(0x0806))) < 0) { <br>
perror( "arp socket error"); <br>
exit(-1); <br>
} <br>
strcpy(ifr.ifr_name, device); <br>
ifr.ifr_addr.sa_family = AF_INET; <br>
/* get ip address of my interface */ <br>
if (ioctl(fd_arp, SIOCGIFADDR, &ifr) < 0) { <br>
perror("ioctl SIOCGIFADDR error"); <br>
exit(-1); <br>
} <br>
sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr; <br>
myself = sin_ptr->sin_addr; <br>
/* get mac address of the interface */ <br>
if (ioctl(fd_arp, SIOCGIFHWADDR, &ifr) < 0) { <br>
perror("ioctl SIOCGIFHWADDR error"); <br>
exit(-1); <br>
} <br>
ptr = (u_char *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0]; <br>
printf( "request mac %02x:%02x:%02x:%02x:%02x:%02x, ", <br>
*ptr, *(ptr + 1), *(ptr + 2), *(ptr + 3), <br>
*(ptr + 4), *(ptr + 5)); <br>
printf( "request IP %s\n", inet_ntoa(myself)); <br>
/* ether header for arp */ <br>
memset(arp->ether_dhost, 0xff, 6); <br>
bcopy(&myself, arp->ether_shost, 4); <br>
arp->ether_type = htons(ETHERTYPE_ARP); <br>
/* arp header */ <br>
arp->ar_hrd = htons(ARPHRD_ETHER); <br>
arp->ar_pro = htons(ETHERTYPE_IP); <br>
arp->ar_hln = 6; <br>
arp->ar_pln = 4; <br>
arp->ar_op = htons(1); <br>
bcopy(ptr, arp->ar_sha, 6); <br>
bcopy(&myself, arp->ar_sip, 4); <br>
bzero(arp->ar_tha, 6); <br>
bcopy(&dstaddr, arp->ar_tip, 4); <br>
bzero(arp->padding, 18); <br>
strcpy(to.sa_data, device); <br>
if ((n = sendto(fd_arp, buf, sizeof(struct myarphdr), 0, <br>
&to, sizeof(to))) < 0) { <br>
perror("send arp request"); <br>
exit(-1); <br>
} <br>
strcpy(from.sa_data, device); <br>
AGAIN: <br>
if (n = recvfrom(fd_arp, buf, PACKET_SIZE, 0, &from, &fromlen)) { <br>
if (arp->ar_op == 0x0200 || !memcmp(arp->ar_sip, &dstaddr, 4 <br>
)) { <br>
printf( "replied mac %02x:%02x:%02x:%02x:%02x:%02x, <br>
", <br>
arp->ar_sha[0], arp->ar_sha[1], <br>
arp->ar_sha[2], arp->ar_sha[3], <br>
arp->ar_sha[4], arp->ar_sha[5] ); <br>
printf( "replied IP %s\n", inet_ntoa(dstaddr)); <br>
return; <br>
} else <br>
goto AGAIN; <br>
} <br>
} <br>
--cut end-- <br>
-- <br>
****************************************************** <br>
青岛啤酒，可能是世界上最好的啤酒 。。。 。。。 <br>
****************************************************** <br>
※ 修改:．cpu 于 Apr 28 13:34:35 修改本文．[FROM: 202.96.190.5] <br>
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