c-router-emulator/router/router.c

#include "router.h"
#include "db.h"

int main(int argc, char const *argv[])
{
    // 初始化
    net_init(); // 初始化网络和数据库

    // pthread_t thread_net_task;
    // pthread_create(&thread_net_task, NULL, net_task, NULL);
    // pthread_join(thread_net_task, NULL);

    close(sockfd); // 关闭原始套接字
    close_mysql(); // 关闭数据库连接

    return 0;
}

void net_init()
{
    // 创建原始套接字
    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
    if (sockfd < 0)
    {
        perror("socket");
        exit(-1);
    }

    // 数据连接测试
    if (connect_mysql("localhost", 3306, "flykhan", "1202", "router") == 0)
        printf("数据库连接成功\n");
    else
        printf("数据库连接错误\n");

    // 选择标志位
    int choice = 0;
    show(); // 打印菜单
    int pthread_flag = 0;
    while (1)
    {
        printf("请输入你的选择: \n");
        scanf("%d", &choice);
        getchar(); // 清空缓冲区
        if (1 == choice)
        {
            char add_blacked_ip[INET_ADDRSTRLEN] = "";
            printf("请输入要添加的黑名单IP：格式如 192.168.6.5\n");
            fgets(add_blacked_ip, sizeof(add_blacked_ip), stdin);
            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
            printf("add_blacked_ip: %s\n", add_blacked_ip);
            // IP 格式检查
            if (is_ip_valid(add_blacked_ip) != 0)
            {
                printf("IP地址格式错误\n");
                continue;
            }

            // 将IP地址加入黑名单
            MYSQL_BIND parmas[1];
            parmas[0].buffer_type = MYSQL_TYPE_STRING;
            parmas[0].buffer = add_blacked_ip;
            parmas[0].buffer_length = strlen(add_blacked_ip);
            parmas[0].is_null = 0;
            parmas[0].length = &parmas[0].buffer_length;
            const char *insert_ip_fw_sql = "insert into ip_fw(ip) values(?)";
            int result = insert(insert_ip_fw_sql, parmas);
            if (result > 0)
            {
                printf("黑名单添加成功\n");
            }
            else
            {
                printf("黑名单添加失败\n");
            }
        }

        else if (2 == choice)
        {
            const char *select_ip_fw_sql = "select * from ip_fw";
            query(select_ip_fw_sql, printResult);
        }

        else if (3 == choice)
        {
            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)
            {
                printf("IP地址格式错误\n");
                continue;
            }

            // 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");
            }
        }
    }
}

// MySQL 测试
int is_blocked_ip(unsigned char *ip)
{
    char sql[1024] = "";
    sprintf(sql, "select * from ip_fw where ip = '%s'", ip);
    int rows = result_rows(sql);

    printf("打印 %s\n", sql);
    printf("rows: %d\n", rows);

    // execlp("iptables", "iptables", "-A", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
    execlp("iptables", "iptables", "-D", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙

    // 获取行数
    if (rows > 0)
    {
        printf("IP地址 %s 在黑名单中\n", ip);
        // execlp("iptables", "iptables", "-A", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
        // 从防火墙删除
        execlp("iptables", "iptables", "-D", "FORWARD", "-s", ip, "-j", "DROP", NULL); // 将源IP地址加入防火墙
        return 0;
    }
    else
    {
        printf("IP地址 %s 不在黑名单中\n", ip);
        return -1;
    }
}

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("%s\n", columns[0]);

    for (int i = 0; i < cols; i++)
    {
        printf("%s: %s \t", columns[i], row[i]);
    }
    printf("\n");
}

void show()
{
    printf("************************************************\n");
    printf("**********路由器黑名单管理系统******************\n");
    printf("**************1.添加黑名单IP********************\n");
    printf("**************2.显示所有黑名单******************\n");
    printf("**************3.删除黑名单**********************\n");
    printf("**************4.开启路由器**********************\n");
    printf("**************5.刷新ARP表缓存*******************\n");
    printf("**************6.显示所有ARP表缓存***************\n");
    printf("**************9.重新打印菜单********************\n");
    printf("**************0.退出此系统**********************\n");
    printf("************************************************\n");
}

// 判断IP地址格式是否正确
int is_ip_valid(const char *ip)
{
    regex_t regex; // 正则表达式
    int ret;

    // 编译正则表达式
    // /^((\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]))?$/
    ret = regcomp(&regex, "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", REG_EXTENDED); // REG_EXTENDED 扩展正则表达式
    if (ret != 0)
    {
        printf("regcomp error\n");
        return -1;
    }

    // 执行正则表达式
    ret = regexec(&regex, ip, 0, NULL, 0);
    regfree(&regex); // 释放正则表达式

    if (ret == 0)
    {
        printf("IP地址格式正确\n");
        return 0;
    }
    else if (ret == REG_NOMATCH)
    {
        printf("IP地址格式非法\n");
        return -1;
    }
    else
    {
        printf("正则表达式匹配错误\n");
        return -1;
    }
}