340 lines
12 KiB
C
340 lines
12 KiB
C
#include "router.h"
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#include "db.h"
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int main(int argc, char const *argv[])
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{
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// 初始化
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net_init(); // 初始化网络和数据库
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// pthread_t thread_net_task;
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// pthread_create(&thread_net_task, NULL, net_task, NULL);
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// pthread_join(thread_net_task, NULL);
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close(sockfd); // 关闭原始套接字
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close_mysql(); // 关闭数据库连接
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return 0;
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}
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void net_init()
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{
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// 创建原始套接字
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sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); // 参数列表：协议族、套接字类型、协议类型
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if (sockfd < 0)
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{
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perror("socket");
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exit(-1);
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}
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// 数据连接测试
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if (connect_mysql("localhost", 3306, "flykhan", "1202", "router") == 0)
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printf("数据库连接成功\n");
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else
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printf("数据库连接错误\n");
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// 选择标志位
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int choice = 0;
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show(); // 打印菜单
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int pthread_flag = 0;
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while (1)
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{
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printf("请输入你的选择: \n");
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scanf("%d", &choice);
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getchar(); // 清空缓冲区
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if (1 == choice)
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{
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char add_blacked_ip[INET_ADDRSTRLEN] = "";
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printf("请输入要添加的黑名单IP：格式如 192.168.6.5\n");
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fgets(add_blacked_ip, sizeof(add_blacked_ip), stdin);
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add_blacked_ip[strlen(add_blacked_ip) - 1] = '\0'; // 将最后的换行符替换为字符串结束符
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printf("add_blacked_ip: %s\n", add_blacked_ip);
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// IP 格式检查
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if (is_ip_valid(add_blacked_ip) != 0)
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{
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printf("IP地址格式错误\n");
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continue;
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}
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// 将IP地址加入黑名单
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MYSQL_BIND parmas[1];
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parmas[0].buffer_type = MYSQL_TYPE_STRING;
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parmas[0].buffer = add_blacked_ip;
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parmas[0].buffer_length = strlen(add_blacked_ip);
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parmas[0].is_null = 0;
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parmas[0].length = &parmas[0].buffer_length;
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const char *insert_ip_fw_sql = "insert into ip_fw(ip) values(?)";
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int result = insert(insert_ip_fw_sql, parmas);
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if (result > 0)
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{
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printf("黑名单添加成功\n");
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}
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else
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{
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printf("黑名单添加失败\n");
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}
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}
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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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printf("net_task\n");
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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); // 0x080 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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// 发送 ARP 请求，用于广播获取网段内的所有已连接设备的mac地址，并存入 ip_mac 映射表
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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); // ICMP(1),IGMP(2),TCP(6),UDP(17),IPv6（41）
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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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// 如果是黑名单IP，则跳过本次循环，即屏蔽本ip的数据
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if (is_blocked_ip(src_ip) == 0 || is_blocked_ip(dst_ip) == 0)
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{
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printf("数据报已被过滤\n");
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continue;
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}
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// is_blocked_ip(src_ip);
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printf("数据报正常\n");
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// 不在黑名单时，进行数据报中ip和mac地址的转换和转发
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// 先检查ip对应的mac地址是否存在（mysql->ip_mac表查询），存在时进行下一步；不存在时，调用三次循环，来进行ARP广播，获取最新的设备ip--mac
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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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return NULL;
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}
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// MySQL 测试
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int is_blocked_ip(unsigned char *ip)
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{
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char sql[1024] = "";
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sprintf(sql, "select * from ip_fw where ip = '%s'", ip);
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int rows = result_rows(sql);
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printf("打印 %s\n", sql);
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printf("rows: %d\n", rows);
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// execlp("iptables", "iptables", "-A", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
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execlp("iptables", "iptables", "-D", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
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// 获取行数
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if (rows > 0)
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{
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printf("IP地址 %s 在黑名单中\n", ip);
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// execlp("iptables", "iptables", "-A", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
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// 从防火墙删除
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execlp("iptables", "iptables", "-D", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
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return 0;
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}
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else
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{
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printf("IP地址 %s 不在黑名单中\n", ip);
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return -1;
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}
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}
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int printResult(MYSQL_ROW row, char (*columns)[30], int cols)
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{
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printf("printResult\n");
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printf("cols: %d\n", cols);
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printf("row: %s\n", row[0]);
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for (int i = 0; i < cols; i++)
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{
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printf("%s: %s\n", columns[i], row[i]);
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}
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printf("\n");
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int rows = atoi(row[0]);
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if (rows > 0)
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{
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printf("IP地址 在黑名单中\n");
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return 0;
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}
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else
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{
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printf("IP地址不在黑名单中\n");
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return -1;
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}
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return atoi(row[0]); // 返回行数
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}
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void show()
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{
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printf("************************************************\n");
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printf("**********路由器黑名单管理系统******************\n");
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printf("**************1.添加黑名单IP********************\n");
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printf("**************2.显示所有黑名单******************\n");
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printf("**************3.删除黑名单**********************\n");
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printf("**************4.开启路由器**********************\n");
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printf("**************5.刷新ARP表缓存*******************\n");
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printf("**************6.显示所有ARP表缓存***************\n");
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printf("**************9.重新打印菜单********************\n");
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printf("**************0.退出此系统**********************\n");
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printf("************************************************\n");
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}
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// 判断IP地址格式是否正确
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int is_ip_valid(const char *ip)
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{
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regex_t regex; // 正则表达式
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int ret;
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// 编译正则表达式
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// /^((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])(?::(?:[0-9]|[1-9][0-9]{1,3}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5]))?$/
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ret = regcomp(®ex, "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", REG_EXTENDED); // REG_EXTENDED 扩展正则表达式
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if (ret != 0)
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{
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printf("regcomp error\n");
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return -1;
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}
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// 执行正则表达式
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ret = regexec(®ex, ip, 0, NULL, 0);
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regfree(®ex); // 释放正则表达式
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if (ret == 0)
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{
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printf("IP地址格式正确\n");
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return 0;
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}
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else if (ret == REG_NOMATCH)
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{
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printf("IP地址格式非法\n");
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return -1;
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}
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else
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{
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printf("正则表达式匹配错误\n");
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return -1;
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}
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} |