ARP协议c语言实现源代码.doc
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什么是ARP协议
英文原义：Address Resolution Protocol
中文释义：（RFC-826）地址解析协议
#include netdb.h
#include unistd.h
#include ctype.h
#include errno.h
#include signal.h
#include string.h
#include stdio.h
#include stdlib.h
#include getopt.h
#include sys/uio.h
#include sys/file.h
#include sys/time.h
#include sys/signal.h
#include sys/ioctl.h
#include sys/param.h
#include sys/socket.h
#include linux/sockios.h
#include linux/if.h
#include linux/if_arp.h
#include linux/if_packet.h
#include linux/types.h
#include netinet/in.h
#include arpa/inet.h
#define src_addr 192.168.0.239
#define device eth0
#define fill_buf aaaaaaaaaaaa
int socket_id;
char *target = src_addr;
int send_count = 0;
int recv_count = 0;
struct in_addr src, dst;
struct sockaddr_ll me, he;
struct timeval send_time, recv_time;
struct in_addr get_src_ip(char * devices)
{
struct sockaddr_in saddr;
int sock_id = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_id 0) {
perror(socket);
exit(2);
}
if (devices) {
if (setsockopt(sock_id, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1)
perror(WARNING: interface is ignored);
}
int alen = sizeof(saddr);
memset(saddr, 0, sizeof(saddr));
saddr.sin_port = htons(0x1000);
saddr.sin_family = AF_INET;
if (connect(sock_id, (struct sockaddr*)saddr, sizeof(saddr)) == -1) {
perror(connect);
exit(2);
}
if (getsockname(sock_id, (struct sockaddr*)saddr, alen) == -1) {
perror(getsockname);
exit(2);
}
close(sock_id);
return saddr.sin_addr;
}
int check_device(char* if_dev, int ss)
{
int ifindex;
struct ifreq ifr;
memset(ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, if_dev, IFNAMSIZ-1);
if (ioctl(ss, SIOCGIFINDEX, ifr) 0) {
fprintf(stderr, arping: unknown iface %s\n, if_dev);
exit(2);
}
ifindex = ifr.ifr_ifindex;
if (ioctl(ss, SIOCGIFFLAGS, (char*)ifr)) {
perror(ioctl(SIOCGIFFLAGS));
exit(2);
}
if (!(ifr.ifr_flagsIFF_UP)) {
printf(Interface \%s\ is down\n, if_dev);
exit(2);
}
if (ifr.ifr_flags(IFF_NOARP|IF
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