ARPOP_REQUEST是请求,相应的应答是什么
时间: 2024-06-22 15:04:21 浏览: 6
ARPOP_REQUEST(Address Resolution Protocol Operation Request)是指地址解析协议(Address Resolution Protocol,ARP)中的请求报文。在计算机网络中,ARP是一种协议,用于将IP地址映射到物理MAC地址,以便数据包能够正确发送到对应的设备。
当一台设备需要知道某个IP地址对应的MAC地址时,它会发送一个ARPOP_REQUEST广播出去,请求信息中包含目标的IP地址。响应报文是ARPOP_REPLY(Address Resolution Protocol Operation Response),这是一台设备接收到请求后,如果它知道所请求的IP-MAC对应关系,就会回应一个包含自己的MAC地址和已知的IP地址的报文。
相关问题
C语言判断arp协议是免费arp的代码
以下是使用C语言判断ARP协议是免费ARP的代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/if_ether.h>
int is_free_arp(struct ether_arp *arp_packet) {
if (ntohs(arp_packet->arp_op) != ARPOP_REQUEST) { // 只处理ARP请求
return 0;
}
if (memcmp(arp_packet->arp_tha, "\x00\x00\x00\x00\x00\x00", 6) != 0) { // 目标MAC地址不是广播地址
return 0;
}
if (memcmp(arp_packet->arp_tpa, arp_packet->arp_spa, 4) != 0) { // 目标IP地址不是本地IP地址
return 0;
}
return 1;
}
int main(int argc, char *argv[]) {
int sockfd;
struct sockaddr_ll saddr;
struct ether_arp arp_packet;
unsigned char buffer[ETH_FRAME_LEN];
ssize_t n;
// 创建原始套接字
sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ARP));
if (sockfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 绑定网络接口
memset(&saddr, 0, sizeof(saddr));
saddr.sll_family = AF_PACKET;
saddr.sll_protocol = htons(ETH_P_ARP);
saddr.sll_ifindex = if_nametoindex("eth0"); // 替换为网络接口名称
if (bind(sockfd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
// 接收并处理ARP请求
while (1) {
n = recv(sockfd, buffer, sizeof(buffer), 0);
if (n < 0) {
perror("recv");
exit(EXIT_FAILURE);
}
memcpy(&arp_packet, buffer + sizeof(struct ether_header), sizeof(struct ether_arp));
if (is_free_arp(&arp_packet)) {
printf("Received a free ARP request from %s\n", inet_ntoa(*(struct in_addr *)arp_packet.arp_spa));
}
}
close(sockfd);
return 0;
}
```
该代码使用了Linux下的原始套接字接收ARP请求,并判断是否为免费ARP请求。其中,`is_free_arp`函数用于判断一个ARP请求是否为免费ARP请求。如果是,则打印源IP地址。需要注意的是,运行该程序需要root权限。
写一段Linux系统上用gcc完成arp报文捕获的代码,代码要求创建原始套接词
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <unistd.h>
#define BUFFER_LENGTH 65536
int main(int argc, char **argv)
{
int sock_raw;
struct sockaddr_in source, dest;
unsigned char *buffer = (unsigned char *)malloc(BUFFER_LENGTH);
// Create raw socket
sock_raw = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ARP));
if (sock_raw < 0)
{
printf("Error creating raw socket\n");
return 1;
}
while (1)
{
// Receive ARP packet
memset(buffer, 0, BUFFER_LENGTH);
int len = recvfrom(sock_raw, buffer, BUFFER_LENGTH, 0, NULL, NULL);
if (len < 0)
{
printf("Error receiving packet\n");
return 1;
}
// Parse ARP packet
struct ethhdr *eth = (struct ethhdr *)buffer;
if (ntohs(eth->h_proto) != ETH_P_ARP)
{
printf("Not an ARP packet\n");
continue;
}
struct arphdr *arp = (struct arphdr *)(buffer + sizeof(struct ethhdr));
if (ntohs(arp->ar_op) != ARPOP_REQUEST && ntohs(arp->ar_op) != ARPOP_REPLY)
{
printf("Not an ARP request or reply\n");
continue;
}
// Print ARP packet information
printf("ARP packet:\n");
printf(" Source MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
eth->h_source[0], eth->h_source[1], eth->h_source[2],
eth->h_source[3], eth->h_source[4], eth->h_source[5]);
printf(" Source IP: %s\n", inet_ntoa(*(struct in_addr *)arp->ar_sip));
printf(" Destination MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
eth->h_dest[0], eth->h_dest[1], eth->h_dest[2],
eth->h_dest[3], eth->h_dest[4], eth->h_dest[5]);
printf(" Destination IP: %s\n", inet_ntoa(*(struct in_addr *)arp->ar_tip));
}
close(sock_raw);
free(buffer);
return 0;
}
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