176 lines
6.8 KiB
C
176 lines
6.8 KiB
C
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#include <pcap/pcap.h>
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#include <stdio.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h> // ioctl 函数 SIOCGIFHWADDR SIOCGIFADDR
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// #include <netinet/if_ether.h>
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#include <string.h>
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#include <unistd.h>
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#include <net/ethernet.h>
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#include <netinet/ether.h>
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#include <netinet/ip.h>
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#include "get_interface.h"
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void *input_task(void *arg)
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{
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char buf[1024];
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while (1)
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{
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bzero(buf, sizeof(buf));
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fgets(buf, sizeof(buf), stdin);
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printf("input: %s\n", buf);
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}
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}
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void *net_task(void *arg)
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{
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// 1. 获取可用的网络设备名称
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char errbuf[PCAP_ERRBUF_SIZE]; // 错误信息
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pcap_if_t *alldevs;
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if (pcap_findalldevs(&alldevs, errbuf) == -1)
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{
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printf("pcap_findalldevs error: %s\n", errbuf);
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return 1;
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}
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/* // 2. 打印网络设备名称
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pcap_if_t *d;
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for (d = alldevs; d != NULL; d = d->next)
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{
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printf("%s\n", d->name);
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} */
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// 3. 获取第一个网络设备的IP地址
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pcap_addr_t *a;
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for (a = alldevs->addresses; a != NULL; a = a->next)
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{
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if (a->addr->sa_family == AF_INET)
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{
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// ntoa 将网络字节序的IP地址转换为点分十进制的字符串
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printf("%s\n", inet_ntoa(((struct sockaddr_in *)a->addr)->sin_addr));
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}
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}
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// 获取网卡的网络号和网络掩码
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bpf_u_int32 netip, netmask;
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if (pcap_lookupnet(alldevs->name, &netip, &netmask, NULL) != 0)
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{
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printf("网络号和网络掩码获取错误\n");
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return -1;
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}
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unsigned char ip[INET_ADDRSTRLEN] = "";
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unsigned char mask[INET_ADDRSTRLEN] = "";
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// ntop 将网络字节序的IP地址转换为点分十进制的字符串
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inet_ntop(AF_INET, &netip, ip, INET_ADDRSTRLEN);
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inet_ntop(AF_INET, &netmask, mask, INET_ADDRSTRLEN);
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printf("网络号: %s 网络掩码: %s\n", ip, mask);
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// 获取网卡的MAC地址
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struct ifreq ifr;
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int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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strcpy(ifr.ifr_name, alldevs->name);
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if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0)
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{
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printf("MAC地址获取失败\n");
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return -1;
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}
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unsigned char mac[6];
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memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
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printf("MAC地址: %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
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// 打开网络设备，开始抓包（捕获数据包）
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pcap_t *pcap_handle = pcap_open_live(alldevs->name, 65535, 1, 0, errbuf); // 65535 最大捕获的字节数 1 混杂模式 0 不超时 errbuf 错误信息
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if (pcap_handle == NULL)
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{
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printf("pcap_open_live error: %s\n", errbuf);
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return 1;
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}
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// 4. 抓包
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struct pcap_pkthdr pcap_header; // 数据包头
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bzero(&pcap_header, sizeof(pcap_header)); // 清空
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const u_char *packet; // 数据包数据
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while (1)
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{
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packet = pcap_next(pcap_handle, &pcap_header); // 抓包
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if (packet == NULL)
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{
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printf("pcap_next error\n");
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return 1;
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}
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printf("数据包长度: %d\n", pcap_header.len);
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printf("捕获的数据长度: %d\n", pcap_header.caplen);
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// printf("数据包时间: %s", ctime((const time_t *)&pcap_header.ts.tv_sec));
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// printf("数据包内容: ");
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// for (int i = 0; i < pcap_header.len; i++)
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// {
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// printf("%02x ", packet[i]);
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// }
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// 5. 解析数据包
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struct ether_header *eth_header = (struct ether_header *)packet; // 以太网帧头
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unsigned char src_mac[18] = "";
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unsigned char dst_mac[18] = "";
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sprintf(src_mac, "%02x:%02x:%02x:%02x:%02x:%02x", eth_header->ether_shost[0], eth_header->ether_shost[1], eth_header->ether_shost[2], eth_header->ether_shost[3], eth_header->ether_shost[4], eth_header->ether_shost[5]); // 将MAC地址转换为点分十进制的字符串
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sprintf(dst_mac, "%02x:%02x:%02x:%02x:%02x:%02x", eth_header->ether_dhost[0], eth_header->ether_dhost[1], eth_header->ether_dhost[2], eth_header->ether_dhost[3], eth_header->ether_dhost[4], eth_header->ether_dhost[5]);
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unsigned short eth_type = ntohs(eth_header->ether_type); // type 字段是网络字节序，需要转换为主机字节序
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printf("以太网帧类型: %04x\n", eth_type); // 0x0800 IP协议 0x0806 ARP协议 0x8035 RARP协议 0x86dd IPv6协议
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printf("目的MAC地址: %s\n", dst_mac);
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printf("源MAC地址: %s\n", src_mac);
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// 如果是ARP协议
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if (eth_type == 0x0806)
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{
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// 分析 arp 报文
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struct ether_arp *arp_header = (struct ether_arp *)(packet + sizeof(struct ether_header)); // arp 报文
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unsigned short this_arp_op = ntohs(arp_header->arp_op); // 操作码
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printf("ARP操作码: %d\n", this_arp_op); // 1 ARP请求 2 ARP应答 3 RARP请求 4 RARP应答
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if (this_arp_op == 1 || this_arp_op == 2)
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{
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unsigned char src_ip[INET_ADDRSTRLEN] = "";
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unsigned char dst_ip[INET_ADDRSTRLEN] = "";
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inet_ntop(AF_INET, arp_header->arp_spa, src_ip, INET_ADDRSTRLEN); // 将网络字节序的IP地址转换为点分十进制的字符串
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inet_ntop(AF_INET, arp_header->arp_tpa, dst_ip, INET_ADDRSTRLEN);
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printf("源IP地址: %s\n", src_ip);
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printf("目的IP地址: %s\n", dst_ip);
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}
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}
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// 如果是IP协议
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if (eth_type == 0x800)
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{
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// 分析 ip 报文
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struct iphdr *ip_header = (struct iphdr *)(packet + sizeof(struct ether_header)); // ip 报文 (sizeof(struct ether_header) = 14 (MAC)以太网帧头长度)
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unsigned char src_ip[INET_ADDRSTRLEN] = "";
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unsigned char dst_ip[INET_ADDRSTRLEN] = "";
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unsigned char ip_protocol[INET_ADDRSTRLEN] = ""; // 协议类型
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inet_ntop(AF_INET, &ip_header->saddr, src_ip, INET_ADDRSTRLEN); // 将网络字节序的IP地址转换为点分十进制的字符串
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inet_ntop(AF_INET, &ip_header->daddr, dst_ip, INET_ADDRSTRLEN);
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printf("IP协议类型: %d\n", ip_header->protocol); // 4 IPv4 6 IPv6
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printf("源IP地址: %s\n", src_ip);
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printf("目的IP地址: %s\n", dst_ip);
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}
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printf("\n");
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sleep(1);
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}
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// 3. 释放资源
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pcap_close(pcap_handle); // 关闭网络设备
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pcap_freealldevs(alldevs); // 释放资源
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}
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int main(int argc, char const *argv[])
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{
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// 开启两个线程
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pthread_t tid1, tid2;
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pthread_create(&tid1, NULL, input_task, NULL);
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pthread_create(&tid2, NULL, net_task, NULL);
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pthread_join(tid1, NULL);
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pthread_
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pthread_join(tid2, NULL);
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return 0;
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}
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