412 lines
13 KiB
C
412 lines
13 KiB
C
#include "cap.h"
|
||
#include "common.h"
|
||
#include "libipset.h"
|
||
#include "libcurl.h"
|
||
#include "cache.h"
|
||
|
||
pcap_if_t *alldevs, *device;
|
||
pcap_t *handle; // 会话句柄
|
||
struct bpf_program fp; // 编译后的过滤器
|
||
|
||
pid_t pid = -1; // 子进程全局PID
|
||
#define SHM_SIZE 1024 // 共享内存大小
|
||
#define SHM_KEY 0124 // 共享内存键值
|
||
int shmid = -1;
|
||
int RULE_NAME_NUMBER = 0; // ipset 集合集合数
|
||
char *RULE_NAME = NULL; // 共享内存
|
||
|
||
char *ip2region_area = NULL; // ip2region 解析结果
|
||
char *command_result = NULL; // 执行命令的结果
|
||
|
||
void Processing_IP_addresses(char *src_ip)
|
||
{
|
||
// 地域白名单
|
||
char _region_list[WHITELIST_IP_NUM][WHITELIST_IP_NUM] = { { 0 }, { 0 } };
|
||
char _REGION_LIST[BUFFER] = { 0 };
|
||
const char *REGION_ENV = NULL;
|
||
char ipset_query_command[256] = { 0 };
|
||
// 定义 Response 结构体
|
||
Response response;
|
||
|
||
// 如果 IP 地址已在缓存中且未过期，则跳过查询
|
||
if (is_ip_in_cache(src_ip)) {
|
||
_printf(RED "IP:%s 已在缓存中，跳过查询\n" REDEND, src_ip);
|
||
return;
|
||
}
|
||
|
||
// 如果ipset规则已经存在，则跳过查询
|
||
snprintf(ipset_query_command, sizeof(ipset_query_command), "ipset test %s %s 2>/dev/null", RULE_NAME, src_ip);
|
||
if (system(ipset_query_command) == 0) {
|
||
// _printf(RED "Ipset 规则内已经存在 %s\n" REDEND, src_ip);
|
||
return;
|
||
}
|
||
|
||
if (1 == is_ip_in_set(cn_ip, src_ip)) {
|
||
_printf(RED "IP:%s 已经标记为国内，跳过！！！\n" REDEND, src_ip);
|
||
|
||
for (int i = 0; i < MAXIPSET_; i++) {
|
||
if (cn_ip[i][0] != '\0') {
|
||
printf("%s ", cn_ip[i]);
|
||
}
|
||
}
|
||
if (cn_ip_len(cn_ip) >= 10240) { // 清理集合
|
||
clear_ip_set(cn_ip);
|
||
truncate_file("cn.txt"); // 清空文件
|
||
}
|
||
|
||
printf("cn_ip_len(cn_ip): %d\n", cn_ip_len(cn_ip));
|
||
|
||
return;
|
||
}
|
||
|
||
// 执行查询并添加到缓存
|
||
ip2region_area = ip2region("ip2region/ip2region.xdb", src_ip);
|
||
if (ip2region_area == NULL) {
|
||
_printf(RED "ip2region 解析地域错误\n" REDEND);
|
||
return;
|
||
}
|
||
|
||
// 取环境变量
|
||
REGION_ENV = getenv("REGION");
|
||
if (REGION_ENV != NULL) {
|
||
_printf("REGION: %s\n", REGION_ENV);
|
||
strcpy(_REGION_LIST, REGION_ENV);
|
||
} else {
|
||
strcpy(_REGION_LIST, "局域网 内网 中国 ");
|
||
}
|
||
|
||
split_string(_REGION_LIST, " ", _region_list);
|
||
if (isregion(ip2region_area, _region_list) == 1) { // 返回1表示在白名单列表
|
||
;
|
||
} else {
|
||
|
||
if (cache_size < MAX_CACHE_SIZE) // 缓存IP数不够预备设定值
|
||
{
|
||
sleep(1);
|
||
_printf("缓存 IP 数 %d\n", cache_size);
|
||
}
|
||
|
||
add_ip_to_cache(src_ip); // 添加到缓存
|
||
|
||
char *p = CurlGetIpArea(src_ip);
|
||
if (parse_json_to_struct(p, &response) == 0) { // 解析 JSON 到结构体
|
||
|
||
if (NULL == strstr(response.continent_country, "中国")) { // 这时是国外IP
|
||
_printf(RED "CurlGetIpArea(): %s %s\n" REDEND, src_ip, response.continent_country);
|
||
add_ip_to_ipset(RULE_NAME, src_ip);
|
||
} else { // 这时是国内IP
|
||
if (-1 == add_cn_ip(cn_ip, src_ip)) { // 添加国内IP到缓存
|
||
_printf(RED "add_cn_ip() Error!!! 错误：集合已满\n" REDEND);
|
||
}
|
||
_printf("IP: %s 离线库为国外, API 判断为国内, 标记为已处理!!!\n", src_ip);
|
||
|
||
if (append_string_to_file("cn.txt", src_ip) != 0) {
|
||
_printf("append_string_to_file() Error!!!\n");
|
||
}
|
||
}
|
||
} else {
|
||
fprintf(stderr, "Failed to parse JSON.\n");
|
||
}
|
||
|
||
if (p != NULL) {
|
||
free(p);
|
||
}
|
||
}
|
||
|
||
if (ip2region_area != NULL) {
|
||
free(ip2region_area);
|
||
ip2region_area = NULL;
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
// 回调函数，在捕获到每个数据包时调用
|
||
void packet_handler(u_char *args, const struct pcap_pkthdr *header, const u_char *packet)
|
||
{
|
||
int ethernet_header_len = 14;
|
||
//struct ip *ip_header = (struct ip *)(packet + ethernet_header_len);
|
||
struct ip *ip_header = (struct ip *)(packet + ethernet_header_len);
|
||
if (ip_header->ip_v != 4)
|
||
return; // 只处理 IPv4
|
||
|
||
char src_ip[INET_ADDRSTRLEN] = { 0 };
|
||
|
||
inet_ntop(AF_INET, &(ip_header->ip_src), src_ip, INET_ADDRSTRLEN);
|
||
Processing_IP_addresses(src_ip);
|
||
|
||
return;
|
||
}
|
||
|
||
void usage()
|
||
{
|
||
printf("DenyIP version %s\n", _VERSION);
|
||
puts("拒绝Linux服务器非大陆IP工具");
|
||
puts("MAIL: aixiao@aixiao.me");
|
||
puts("Date: 20241024");
|
||
puts(" Usage: denyip [-d] [-i <interface>] [-s <start|stop>] [-h|-?]");
|
||
puts(" -d --daemon Daemon mode");
|
||
puts(" -i --interface interface (default eth0)");
|
||
puts(" -f --protocol 过滤器 [\"tcp\" | \"udp\" | \"tcp or udp\"] (default \"tcp\")");
|
||
puts(" -l print iptables rule");
|
||
puts(" -s --signal regular signal (default start|stop) ");
|
||
puts(" start Enable Iptables rule");
|
||
puts(" stop Disable Iptables rule");
|
||
puts(" -h|-? Help Information");
|
||
puts("");
|
||
|
||
exit(0);
|
||
}
|
||
|
||
void cleanup_(int signum)
|
||
{
|
||
|
||
_printf("Received signal %d, cleaning up...\n", signum);
|
||
|
||
// 终止子进程
|
||
if (pid > 0) {
|
||
kill(pid, SIGTERM);
|
||
}
|
||
|
||
// 释放共享内存
|
||
if (RULE_NAME != NULL) {
|
||
shmdt(RULE_NAME);
|
||
shmctl(shmid, IPC_RMID, NULL);
|
||
}
|
||
|
||
// 在程序结束时，清理缓存链表
|
||
free_ip_cache();
|
||
|
||
if (ip2region_area != NULL) {
|
||
free(ip2region_area);
|
||
ip2region_area = NULL;
|
||
}
|
||
if (command_result != NULL) {
|
||
free(command_result);
|
||
command_result = NULL;
|
||
}
|
||
|
||
// 清理
|
||
pcap_freecode(&fp);
|
||
pcap_freealldevs(alldevs); // 释放设备列表
|
||
//pcap_close(handle); // 关闭会话句柄
|
||
|
||
// 退出主进程
|
||
exit(0);
|
||
|
||
return;
|
||
}
|
||
|
||
int main(int argc, char **argv)
|
||
{
|
||
// 注册 SIGTERM 信号处理函数
|
||
signal(SIGTERM, cleanup_);
|
||
|
||
int opt;
|
||
char errbuf[PCAP_ERRBUF_SIZE] = { 0 }; // 错误缓冲区
|
||
char protocol[256] = "tcp";
|
||
char interface[256] = "{ 0 }";
|
||
char Ipset_Command[BUFFER] = { 0 };
|
||
|
||
strcpy(interface, "eth0");
|
||
memset(&alldevs, 0, sizeof(alldevs));
|
||
memset(&device, 0, sizeof(device));
|
||
memset(errbuf, 0, PCAP_ERRBUF_SIZE);
|
||
|
||
int longindex = 0;
|
||
char optstring[] = "di:f:s:lh?";
|
||
static struct option longopts[] = {
|
||
{ "interface", required_argument, 0, 'i' },
|
||
{ "protocol", required_argument, 0, 'f' },
|
||
{ "signal", required_argument, 0, 's' },
|
||
{ "daemon", no_argument, 0, 'd' },
|
||
{ "l", no_argument, 0, 'l' },
|
||
{ "help", no_argument, 0, 'h' },
|
||
{ "?", no_argument, 0, '?' },
|
||
{ 0, 0, 0, 0 }
|
||
};
|
||
|
||
while (-1 != (opt = getopt_long(argc, argv, optstring, longopts, &longindex))) {
|
||
switch (opt) {
|
||
case 'd':
|
||
if (daemon(1, 1)) {
|
||
perror("daemon");
|
||
}
|
||
break;
|
||
case 'i':
|
||
strcpy(interface, optarg);
|
||
break;
|
||
case 'f':
|
||
strcpy(protocol, optarg);
|
||
break;
|
||
case 'l':
|
||
system("iptables -L -v -n --line-numbers");
|
||
exit(0);
|
||
break;
|
||
case 's':
|
||
if (strcmp(optarg, "start") == 0) {
|
||
memset(Ipset_Command, 0, BUFFER);
|
||
// 将 MAXIPSET_RULT_NAME_NUM 替换为实际值
|
||
snprintf(Ipset_Command, sizeof(Ipset_Command), "for n in $(seq 0 %d); do iptables -A INPUT -p tcp -m set --match-set root$n src -j DROP 2> /dev/null; done", MAXIPSET_RULT_NAME_NUM);
|
||
system(Ipset_Command);
|
||
exit(0);
|
||
} else if (strcmp(optarg, "stop") == 0) {
|
||
memset(Ipset_Command, 0, BUFFER);
|
||
// 将 MAXIPSET_RULT_NAME_NUM 替换为实际值
|
||
snprintf(Ipset_Command, sizeof(Ipset_Command), "for n in $(seq 0 %d); do iptables -D INPUT -p tcp -m set --match-set root$n src -j DROP 2> /dev/null; done", MAXIPSET_RULT_NAME_NUM);
|
||
system(Ipset_Command);
|
||
exit(0);
|
||
} else {
|
||
usage();
|
||
exit(0);
|
||
}
|
||
|
||
break;
|
||
case 'h':
|
||
case '?':
|
||
usage();
|
||
exit(0);
|
||
break;
|
||
default:
|
||
usage();
|
||
exit(0);
|
||
break;
|
||
}
|
||
}
|
||
|
||
// 创建共享内存
|
||
shmid = shmget(SHM_KEY, SHM_SIZE, IPC_CREAT | 0666);
|
||
if (shmid < 0) {
|
||
perror("shmget");
|
||
exit(1);
|
||
}
|
||
|
||
// 连接共享内存到进程地址空间
|
||
RULE_NAME = (char *)shmat(shmid, NULL, 0);
|
||
if (RULE_NAME == (char *)-1) {
|
||
perror("shmat");
|
||
exit(1);
|
||
}
|
||
|
||
// 读取缓存
|
||
if (1 == file_exists_access("cn.txt")) {
|
||
int line_count = 0;
|
||
int result = read_file_to_array("cn.txt", cn_ip, &line_count);
|
||
if (result != 0) {
|
||
fprintf(stderr, "Failed to read file with error code: %d\n", result);
|
||
return 1;
|
||
}
|
||
|
||
char *local_addr = GetLocalAddr("https://inet-ip.aixiao.me/");
|
||
if (local_addr == NULL) {
|
||
perror("GetLocalAddr()");
|
||
return 1;
|
||
}
|
||
remove_char(local_addr, '\n');
|
||
printf("Local Address: %s\n", local_addr);
|
||
|
||
printf("Read %d lines from file:\n", line_count);
|
||
for (int i = 0; i < line_count; i++) {
|
||
printf("Line %d: %s\n", i + 1, cn_ip[i]);
|
||
}
|
||
|
||
free(local_addr);
|
||
}
|
||
|
||
pid = fork(); // 创建子进程
|
||
if (pid == 0) // 子进程
|
||
{
|
||
int count = 0;
|
||
snprintf(RULE_NAME, BUFFER, "root%d", RULE_NAME_NUMBER);
|
||
|
||
if (create_ipset(RULE_NAME) != 0) {
|
||
_printf("创建 IPSet %s 失败\n", RULE_NAME);
|
||
}
|
||
|
||
while (1) {
|
||
//_printf("子进程当前 Ipset Rule 名 %s\n", RULE_NAME);
|
||
count = get_ip_count_in_ipset(RULE_NAME);
|
||
if (count >= 0) {
|
||
_printf("子进程当前 Ipset Rule 名 %s, 数量: %d \n", RULE_NAME, count);
|
||
if (count >= MAXIPSET && RULE_NAME_NUMBER <= MAXIPSET_RULT_NAME_NUM) // RULE_中的IP数量不超过MAXIPSET，并且集合不能超过 MAXIPSET_RULT_NAME_NUM 个
|
||
{
|
||
RULE_NAME_NUMBER++;
|
||
|
||
snprintf(RULE_NAME, BUFFER, "root%d", RULE_NAME_NUMBER); // 更新规则名称
|
||
// 创建新的 IPSet
|
||
if (create_ipset(RULE_NAME) != 0) {
|
||
_printf("创建 IPSet %s 失败\n", RULE_NAME);
|
||
} else {
|
||
char iptables_command[256];
|
||
sprintf(iptables_command, "iptables -I INPUT -m set --match-set %s src -j DROP", RULE_NAME);
|
||
system(iptables_command);
|
||
}
|
||
}
|
||
|
||
if (RULE_NAME_NUMBER == MAXIPSET_RULT_NAME_NUM) {
|
||
_printf("已达到最大规则数限制，停止创建新规则。\n");
|
||
_printf("请手动清理Ipset规则\n");
|
||
}
|
||
}
|
||
|
||
sleep(3); // 每 3 秒检查一次
|
||
}
|
||
}
|
||
|
||
// 查找可用的网络设备
|
||
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
|
||
fprintf(stderr, "无法找到设备: %s\n", errbuf);
|
||
return 1;
|
||
}
|
||
|
||
// 打印可用设备列表
|
||
_printf("可用的设备:\n");
|
||
for (device = alldevs; device != NULL; device = device->next) {
|
||
_printf("设备: %s\n", device->name);
|
||
}
|
||
|
||
// 打开设备以进行数据包捕获
|
||
handle = pcap_open_live(interface, BUFSIZ, 1, 1000, errbuf);
|
||
if (handle == NULL) {
|
||
fprintf(stderr, "无法打开设备 %s: %s\n", interface, errbuf);
|
||
pcap_freealldevs(alldevs);
|
||
return 1;
|
||
}
|
||
|
||
// 编译过滤器
|
||
if (pcap_compile(handle, &fp, protocol, 0, PCAP_NETMASK_UNKNOWN) == -1) {
|
||
fprintf(stderr, "无法编译过滤器 %s: %s\n", protocol, pcap_geterr(handle));
|
||
pcap_close(handle);
|
||
pcap_freealldevs(alldevs);
|
||
return 1;
|
||
}
|
||
|
||
// 设置过滤器
|
||
if (pcap_setfilter(handle, &fp) == -1) {
|
||
fprintf(stderr, "无法设置过滤器 %s: %s\n", protocol, pcap_geterr(handle));
|
||
pcap_freecode(&fp);
|
||
pcap_close(handle);
|
||
pcap_freealldevs(alldevs);
|
||
return 1;
|
||
}
|
||
|
||
// 开始捕获数据包
|
||
if (pcap_loop(handle, 0, packet_handler, NULL) < 0) {
|
||
fprintf(stderr, "捕获数据包时出错: %s\n", pcap_geterr(handle));
|
||
pcap_freecode(&fp);
|
||
pcap_close(handle);
|
||
pcap_freealldevs(alldevs);
|
||
return 1;
|
||
}
|
||
|
||
// 在程序结束时，清理缓存链表
|
||
free_ip_cache();
|
||
|
||
// 清理
|
||
pcap_freecode(&fp);
|
||
pcap_freealldevs(alldevs); // 释放设备列表
|
||
pcap_close(handle); // 关闭会话句柄
|
||
|
||
return 0;
|
||
}
|