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c-router-emulator
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路由器修改

This commit is contained in:
flykhan 2023-09-20 16:51:37 +08:00
parent e04f8575b4
commit 5877e07161
2 changed files with 38 additions and 167 deletions
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203
router/router.c
View File

@ -73,164 +73,46 @@ void net_init()
printf("黑名单添加失败\n");
}
}
}
}
void *net_task(void *arg)
{
printf("net_task\n");
// 1. 获取可用的网络设备名称
char errbuf[PCAP_ERRBUF_SIZE]; // 错误信息
pcap_if_t *alldevs;
if (pcap_findalldevs(&alldevs, errbuf) == -1)
else if (2 == choice)
{
printf("pcap_findalldevs error: %s\n", errbuf);
return 1;
const char *select_ip_fw_sql = "select * from ip_fw";
query(select_ip_fw_sql, printResult);
}
// 2. 打印网络设备名称
pcap_if_t *d;
for (d = alldevs; d != NULL; d = d->next)
else if (3 == choice)
{
printf("%s\n", d->name);
}
// 3. 获取第一个网络设备的IP地址
pcap_addr_t *a;
for (a = alldevs->addresses; a != NULL; a = a->next)
char delete_blacked_ip[INET_ADDRSTRLEN] = "";
printf("请输入要删除的黑名单IP：格式如 192.168.6.5\n");
fgets(delete_blacked_ip, sizeof(delete_blacked_ip), stdin);
delete_blacked_ip[strlen(delete_blacked_ip) - 1] = '\0'; // 将最后的换行符替换为字符串结束符
printf("delete_blacked_ip: %s\n", delete_blacked_ip);
// IP 格式检查
if (is_ip_valid(delete_blacked_ip) != 0)
{
if (a->addr->sa_family == AF_INET)
{
// ntoa 将网络字节序的IP地址转换为点分十进制的字符串
printf("%s\n", inet_ntoa(((struct sockaddr_in *)a->addr)->sin_addr));
}
}
// 获取网卡的网络号和网络掩码
bpf_u_int32 netip, netmask;
if (pcap_lookupnet(alldevs->name, &netip, &netmask, NULL) != 0)
{
printf("网络号和网络掩码获取错误\n");
return -1;
}
unsigned char ip[INET_ADDRSTRLEN] = "";
unsigned char mask[INET_ADDRSTRLEN] = "";
// ntop 将网络字节序的IP地址转换为点分十进制的字符串
inet_ntop(AF_INET, &netip, ip, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &netmask, mask, INET_ADDRSTRLEN);
printf("网络号: %s 网络掩码: %s\n", ip, mask);
// 获取网卡的MAC地址
struct ifreq ifr;
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
strcpy(ifr.ifr_name, alldevs->name);
if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0)
{
printf("MAC地址获取失败\n");
return -1;
}
unsigned char mac[6];
memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
printf("MAC地址: %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
// 打开网络设备，开始抓包（捕获数据包）
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
if (pcap_handle == NULL)
{
printf("pcap_open_live error: %s\n", errbuf);
return 1;
}
// 4. 抓包
struct pcap_pkthdr pcap_header; // 数据包头
bzero(&pcap_header, sizeof(pcap_header)); // 清空
const u_char *packet; // 数据包数据
while (1)
{
packet = pcap_next(pcap_handle, &pcap_header); // 抓包
if (packet == NULL)
{
printf("pcap_next error\n");
return 1;
}
printf("数据包长度: %d\n", pcap_header.len);
printf("捕获的数据长度: %d\n", pcap_header.caplen);
// printf("数据包时间: %s", ctime((const time_t *)&pcap_header.ts.tv_sec));
// printf("数据包内容: ");
// for (int i = 0; i < pcap_header.len; i++)
// {
// printf("%02x ", packet[i]);
// }
// 5. 解析数据包
struct ether_header *eth_header = (struct ether_header *)packet; // 以太网帧头
unsigned char src_mac[18] = "";
unsigned char dst_mac[18] = "";
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
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]);
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
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
printf("目的MAC地址: %s\n", dst_mac);
printf("源MAC地址: %s\n", src_mac);
// 如果是ARP协议
if (eth_type == 0x0806)
{
// // 分析 arp 报文
// struct ether_arp *arp_header = (struct ether_arp *)(packet + sizeof(struct ether_header)); // arp 报文
// unsigned short this_arp_op = ntohs(arp_header->arp_op); // 操作码
// 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
// if (this_arp_op == 1 || this_arp_op == 2)
// {
// unsigned char src_ip[INET_ADDRSTRLEN] = "";
// unsigned char dst_ip[INET_ADDRSTRLEN] = "";
// 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
// inet_ntop(AF_INET, arp_header->arp_tpa, dst_ip, INET_ADDRSTRLEN);
// printf("源IP地址: %s\n", src_ip);
// printf("目的IP地址: %s\n", dst_ip);
// }
// 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
}
// 如果是IP协议
if (eth_type == 0x800)
{
// 分析 ip 报文
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)
unsigned char src_ip[INET_ADDRSTRLEN] = "";
unsigned char dst_ip[INET_ADDRSTRLEN] = "";
unsigned char ip_protocol[INET_ADDRSTRLEN] = ""; // 协议类型
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
inet_ntop(AF_INET, &ip_header->daddr, dst_ip, INET_ADDRSTRLEN);
printf("IP协议类型: %d\n", ip_header->protocol); // ICMP(1),IGMP(2),TCP(6),UDP(17),IPv6（41）
printf("源IP地址: %s\n", src_ip);
printf("目的IP地址: %s\n", dst_ip);
// 如果是黑名单IP，则跳过本次循环，即屏蔽本ip的数据
if (is_blocked_ip(src_ip) == 0 || is_blocked_ip(dst_ip) == 0)
{
printf("数据报已被过滤\n");
printf("IP地址格式错误\n");
continue;
}
// is_blocked_ip(src_ip);
printf("数据报正常\n");
// 不在黑名单时，进行数据报中ip和mac地址的转换和转发
// 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
// 将IP地址从黑名单中删除
MYSQL_BIND parmas[1];
parmas[0].buffer_type = MYSQL_TYPE_STRING;
parmas[0].buffer = delete_blacked_ip;
parmas[0].buffer_length = strlen(delete_blacked_ip);
parmas[0].is_null = 0;
parmas[0].length = &parmas[0].buffer_length;
const char *delete_ip_fw_sql = "delete from ip_fw where ip = ?";
int result = delete(delete_ip_fw_sql, parmas);
if (result > 0)
{
printf("黑名单删除成功\n");
}
else
{
printf("黑名单删除失败\n");
}
}
printf("\n");
sleep(1);
}
// 3. 释放资源
pcap_close(pcap_handle); // 关闭网络设备
pcap_freealldevs(alldevs); // 释放资源
return NULL;
}
// MySQL 测试
@ -262,30 +144,19 @@ int is_blocked_ip(unsigned char *ip)
}
}
int printResult(MYSQL_ROW row, char (*columns)[30], int cols)
void printResult(MYSQL_ROW row, char (*columns)[30], int cols)
{
printf("printResult\n");
printf("cols: %d\n", cols);
printf("row: %s\n", row[0]);
// printf("printResult\n");
// printf("cols: %d\n", cols);
// printf("row: %s\n", row[0]);
// printf("%s\n", columns[0]);
for (int i = 0; i < cols; i++)
{
printf("%s: %s\n", columns[i], row[i]);
printf("%s", row[i]);
}
printf("\n");
int rows = atoi(row[0]);
if (rows > 0)
{
printf("IP地址 在黑名单中\n");
return 0;
}
else
{
printf("IP地址不在黑名单中\n");
return -1;
}
return atoi(row[0]); // 返回行数
}
void show()

2
router/router.h
View File

@ -31,7 +31,7 @@ void show(void); // 后端控制菜单
void net_init(); // 网络初始化
void *net_task(void *arg); // 网络任务
int is_blocked_ip(unsigned char *ip); // 黑名单探测
int printResult(MYSQL_ROW row, char (*columns)[30], int cols);
void printResult(MYSQL_ROW row, char (*columns)[30], int cols); // 显示查询结果的回调函数
int is_ip_valid(const char *ip); // 检查ip地址是否合法
#endif