439 lines
16 KiB
C
Executable File
439 lines
16 KiB
C
Executable File
/*
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HTTPUDP模块代理UDP过程:
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获取客户端UDP数据
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向服务器发送一个http请求头
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收到服务端回应后发送数据到服务端，内容为: UDP原始目标地址[struct in_addr](只有第一个数据包发送) + UDP长度[uint16_t] + UDP真实数据
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服务端返回数据，数据内容为: UDP包的长度[uint16_t] + UDP真实数据
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新建一个socket伪装原目标地址向客户端发送返回的数据(此功能需要root，否则部分UDP代理不上，例如QQ语音)
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*/
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#include "http_request.h"
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#include "httpudp.h"
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#define MAX_CLIENT_INFO 512
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#define HTTP_RSP_SIZE 2048
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#define CLIENT_BUFFER_SIZE 65535 //如果可以 尽量一次性读完数据
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#define SERVER_BUFFER_SIZE 8192
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typedef struct connection_info {
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char client_data[CLIENT_BUFFER_SIZE + sizeof(struct sockaddr_in) + sizeof(uint16_t)];
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struct sockaddr_in inaddr, toaddr;
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struct connection_info *next;
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char *rsp_data;
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int client_data_len, client_data_sent_len, http_request_sent_len, rsp_data_len, rsp_data_sent_len, server_fd, responseClientFd, timer;
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} info_t;
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static info_t client_info_list[MAX_CLIENT_INFO];
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static struct epoll_event udp_evs[MAX_CLIENT_INFO * 2 + 2], udp_ev;
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struct httpudp udp;
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static int udp_efd;
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static void proxyStop(info_t * info)
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{
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epoll_ctl(udp_efd, EPOLL_CTL_DEL, info->server_fd, NULL);
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epoll_ctl(udp_efd, EPOLL_CTL_DEL, info->responseClientFd, NULL);
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close(info->server_fd);
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close(info->responseClientFd);
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free(info->rsp_data);
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info->rsp_data = NULL;
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do {
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info->server_fd = info->responseClientFd = -1;
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info->rsp_data_len = info->rsp_data_sent_len = info->client_data_sent_len = info->http_request_sent_len = 0;
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} while ((info = info->next) != NULL);
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}
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void udp_timeout_check()
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{
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int i;
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for (i = 0; i < MAX_CLIENT_INFO; i++) {
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if (client_info_list[i].server_fd > -1) {
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if (client_info_list[i].timer >= global.timeout_m)
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proxyStop(client_info_list + i);
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else
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client_info_list[i].timer = 0;
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}
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}
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}
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/* 创建udpfd回应客户端 */
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static int createRspFd(info_t * client)
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{
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int opt = 1;
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client->responseClientFd = socket(AF_INET, SOCK_DGRAM, 0);
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if (client->responseClientFd < 0)
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return 1;
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fcntl(client->responseClientFd, F_SETFL, O_NONBLOCK);
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/*
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以下函数不做返回值判断
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因为有些UDP客户端不需要伪装源目标地址
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*/
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setsockopt(client->responseClientFd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
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setsockopt(client->responseClientFd, SOL_IP, IP_TRANSPARENT, &opt, sizeof(opt));
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//切换root伪装源目标地址
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if (-1 == seteuid(0))
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perror("seteuid");
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if (-1 == setegid(0))
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perror("setegid");
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bind(client->responseClientFd, (struct sockaddr *)&client->toaddr, sizeof(struct sockaddr_in));
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//切换回用户设置的uid
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if (-1 == setegid(global.uid))
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perror("setegid");
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if (-1 == seteuid(global.uid))
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perror("seteuid");
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return 0;
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}
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/* 将服务端返回的数据发送到客户端 */
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static int outputToClient(info_t * client)
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{
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char *dataPtr;
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int write_len;
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if (client->responseClientFd < 0 && createRspFd(client) < 0)
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return 1;
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client->timer = 0;
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dataPtr = client->rsp_data;
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//至少要有一个完整的udp包才返回客户端
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while ((int)(*(uint16_t *) dataPtr + sizeof(uint16_t)) <= client->rsp_data_len) {
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write_len = sendto(client->responseClientFd, dataPtr + sizeof(uint16_t) + client->rsp_data_sent_len, *(uint16_t *) dataPtr - client->rsp_data_sent_len, 0, (struct sockaddr *)&client->inaddr, sizeof(struct sockaddr_in));
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//printf("rsp: [write_len:%d, dataLen:%u, sent:%u, total:%d]\n", write_len, *(uint16_t *)dataPtr, client->rsp_data_sent_len, client->rsp_data_len);
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if (write_len < 0 && errno == EAGAIN)
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return 0;
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client->rsp_data_sent_len += write_len;
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if (write_len == 0 || write_len < 0) {
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//perror("toClient write()");
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return 1;
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}
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if (write_len < *(uint16_t *) dataPtr) {
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udp_ev.data.ptr = client;
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udp_ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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epoll_ctl(udp_efd, EPOLL_CTL_ADD, client->responseClientFd, &udp_ev);
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return 0;
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}
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dataPtr += write_len + sizeof(uint16_t);
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client->rsp_data_len -= write_len + sizeof(uint16_t);
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client->rsp_data_sent_len = 0;
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}
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//发送完已读取到的所有数据 释放内存
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if (client->rsp_data_len == 0) {
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free(client->rsp_data);
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client->rsp_data = NULL;
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udp_ev.data.ptr = client;
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udp_ev.events = EPOLLIN | EPOLLET;
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epoll_ctl(udp_efd, EPOLL_CTL_MOD, client->responseClientFd, &udp_ev);
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}
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//还有数据未返回给客户端，将未返回的数据复制到内存头
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else if (dataPtr > client->rsp_data) {
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memmove(client->rsp_data, dataPtr, client->rsp_data_len);
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}
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return 0;
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}
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/* 读取服务器的数据并返回给客户端 */
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static void recvServer(info_t * in)
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{
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in->timer = 0;
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//当条件成立时表示未接收https回应状态码
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if (udp.http_request_len == in->http_request_sent_len) {
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static char http_rsp[HTTP_RSP_SIZE];
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int read_len;
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do {
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read_len = read(in->server_fd, http_rsp, HTTP_RSP_SIZE);
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if (read_len == 0 || (read_len < 0 && errno != EAGAIN)) {
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proxyStop(in);
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return;
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}
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} while (read_len == HTTP_RSP_SIZE);
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in->http_request_sent_len++; //不再接收http头
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udp_ev.data.ptr = in;
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udp_ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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epoll_ctl(udp_efd, EPOLL_CTL_MOD, in->server_fd, &udp_ev);
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return;
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}
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char *new_data;
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int read_len;
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do {
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new_data = (char *)realloc(in->rsp_data, in->rsp_data_len + SERVER_BUFFER_SIZE);
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if (new_data == NULL) {
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proxyStop(in);
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return;
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}
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in->rsp_data = new_data;
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read_len = read(in->server_fd, in->rsp_data + in->rsp_data_len, SERVER_BUFFER_SIZE);
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/* 判断是否关闭连接 */
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if (read_len <= 0) {
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if (read_len == 0 || errno != EAGAIN || in->rsp_data_len == 0) {
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proxyStop(in);
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return;
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}
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read_len = 0;
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break;
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}
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if (udp.httpsProxy_encodeCode)
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dataEncode(in->rsp_data + in->rsp_data_len, read_len, udp.httpsProxy_encodeCode);
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if (udp.encodeCode)
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dataEncode(in->rsp_data + in->rsp_data_len, read_len, udp.encodeCode);
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in->rsp_data_len += read_len;
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} while (read_len == SERVER_BUFFER_SIZE);
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outputToClient(in);
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}
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/* 向服务器发送数据 */
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static int sendToServer(info_t * out)
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{
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info_t *send_info;
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int len;
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out->timer = 0;
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/* 发送http请求头到服务器 */
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if (udp.http_request_len > out->http_request_sent_len) {
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len = write(out->server_fd, udp.http_request + out->http_request_sent_len, udp.http_request_len - out->http_request_sent_len);
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if (len <= 0) {
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if (len == 0 || errno != EAGAIN)
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return 1;
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return 0;
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}
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if (len > 0) {
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out->http_request_sent_len += len;
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if (udp.http_request_len == out->http_request_sent_len) {
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udp_ev.data.ptr = out;
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udp_ev.events = EPOLLIN | EPOLLET;
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epoll_ctl(udp_efd, EPOLL_CTL_MOD, out->server_fd, &udp_ev);
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}
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}
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return 0;
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}
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/* 发送UDP目标地址,UDP数据长度和UDP真实数据到服务器 */
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for (send_info = out; send_info; send_info = send_info->next) {
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if (send_info->client_data_len == send_info->client_data_sent_len)
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continue;
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len = write(out->server_fd, send_info->client_data + send_info->client_data_sent_len, send_info->client_data_len - send_info->client_data_sent_len);
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//printf("server_fd: %d, write_len: %d, udp_len: %d, sent_le: %d\n", out->server_fd, len, send_info->client_data_len - send_info->client_data_sent_len, send_info->client_data_sent_len);
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if (len <= 0) {
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if (len == 0 || errno != EAGAIN)
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return 1;
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break;
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}
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send_info->client_data_sent_len += len;
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if (send_info->client_data_sent_len < send_info->client_data_len)
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break;
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if (send_info != out) {
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//此结构体已用完
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send_info->server_fd = -1;
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send_info->client_data_sent_len = 0;
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}
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}
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if (send_info == NULL) {
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udp_ev.data.ptr = out;
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udp_ev.events = EPOLLIN | EPOLLET;
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epoll_ctl(udp_efd, EPOLL_CTL_MOD, out->server_fd, &udp_ev);
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}
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out->next = send_info;
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return 0;
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}
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static void outEvent(info_t * out)
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{
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if (out->server_fd == -1)
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return;
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if ((out->rsp_data && outputToClient(out) != 0) || sendToServer(out) != 0)
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proxyStop(out);
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}
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static int recvClient(info_t * client)
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{
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static char control[1024];
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struct msghdr msg;
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struct iovec io;
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struct cmsghdr *cmsg;
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msg.msg_name = &client->inaddr;
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msg.msg_namelen = sizeof(client->inaddr);
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msg.msg_iov = &io;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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io.iov_base = client->client_data + sizeof(struct sockaddr_in) + sizeof(uint16_t);
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io.iov_len = CLIENT_BUFFER_SIZE;
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client->client_data_len = recvmsg(global.udp_listen_fd, &msg, 0);
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if (client->client_data_len <= 0) {
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//perror("recvmsg()");
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return 1;
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}
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/* 取得客户端目标地址 */
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
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if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_ORIGDSTADDR && cmsg->cmsg_len >= CMSG_LEN(sizeof(client->toaddr))) {
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memcpy(&client->toaddr, CMSG_DATA(cmsg), sizeof(client->toaddr));
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break;
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}
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if (cmsg == NULL)
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return 1;
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/*
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printf("src ip: [%s], port: [%d]\n", inet_ntoa(client->inaddr.sin_addr), ntohs(client->inaddr.sin_port));
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printf("dst ip: [%s], port: [%d]\n", inet_ntoa(client->toaddr.sin_addr), ntohs(client->toaddr.sin_port));
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*/
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//printf("client len: %d\n", client->client_data_len);
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//复制udp长度和原始目标地址
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memcpy(client->client_data, &client->toaddr, sizeof(struct sockaddr_in));
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memcpy(client->client_data + sizeof(struct sockaddr_in), &client->client_data_len, sizeof(uint16_t));
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client->client_data_len += sizeof(uint16_t) + sizeof(struct sockaddr_in);
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if (udp.encodeCode)
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dataEncode(client->client_data, client->client_data_len, udp.encodeCode);
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if (udp.httpsProxy_encodeCode)
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dataEncode(client->client_data, client->client_data_len, udp.httpsProxy_encodeCode);
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client->next = NULL;
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return 0;
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}
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static void connectToServer(info_t * info)
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{
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info->timer = 0;
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info->server_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (info->server_fd < 0)
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return;
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fcntl(info->server_fd, F_SETFL, O_NONBLOCK);
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udp_ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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udp_ev.data.ptr = info;
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if (epoll_ctl(udp_efd, EPOLL_CTL_ADD, info->server_fd, &udp_ev) != 0) {
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close(info->server_fd);
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info->server_fd = -1;
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} else if (connect(info->server_fd, (struct sockaddr *)&udp.dst, sizeof(udp.dst)) != 0 && errno != EINPROGRESS) {
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epoll_ctl(udp_efd, EPOLL_CTL_DEL, info->server_fd, NULL);
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close(info->server_fd);
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info->server_fd = -1;
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}
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}
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/* 源地址跟目标地址一样的话，服务端需要同一个socket转发 */
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static int margeClient(info_t * client)
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{
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int i;
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for (i = 0; i < MAX_CLIENT_INFO; i++) {
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if (client != client_info_list + i && client_info_list[i].server_fd > -1 && memcmp(((char *)&client->toaddr) + 2, ((char *)&client_info_list[i].toaddr) + 2, 6) == 0 && memcmp(((char *)&client->inaddr) + 2, ((char *)&client_info_list[i].inaddr) + 2, 6) == 0) {
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info_t *lastInfo;
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for (lastInfo = client_info_list + i; lastInfo->next; lastInfo = lastInfo->next) ;
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lastInfo->next = client;
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client->server_fd = -2; //保证下次调用margeClient()不匹配到这个结构体 并且不被其他客户端连接使用
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client->client_data_sent_len = sizeof(struct sockaddr_in); //不再发送UDP目标地址
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//没有收到服务端回应前不发送UDP的数据
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if (client_info_list[i].http_request_sent_len > udp.http_request_len) {
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udp_ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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udp_ev.data.ptr = client_info_list + i;
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epoll_ctl(udp_efd, EPOLL_CTL_MOD, client_info_list[i].server_fd, &udp_ev);
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}
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return 0;
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}
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}
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return 1;
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}
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static void new_client()
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{
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int i;
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for (i = 0; i < MAX_CLIENT_INFO; i++) {
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if (client_info_list[i].server_fd == -1) {
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if (recvClient(client_info_list + i) == 0)
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if (margeClient(client_info_list + i) != 0)
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connectToServer(client_info_list + i);
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return;
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}
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}
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}
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static void http_udp_req_init()
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{
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char dest[22];
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sprintf(dest, "%s:%u", inet_ntoa(udp.dst.sin_addr), ntohs(udp.dst.sin_port));
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if (udp.http_request) {
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udp.http_request_len = strlen(udp.http_request) + 2;
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udp.http_request = (char *)realloc(udp.http_request, udp.http_request_len + 1);
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if (udp.http_request == NULL)
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errors("httpudp http request initializate failed.");
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strcat(udp.http_request, "\r\n");
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[V]", 3, "HTTP/1.1", 8);
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[H]", 3, dest, strlen(dest));
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "\\0", 2, "\0", 1);
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[M]", 3, "CONNECT", 7);
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[url]", 5, "/", 1);
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[U]", 3, "/", 1);
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} else { /* 默认使用CONNECT请求 */
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if (https.encodeCode) {
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dataEncode(dest, strlen(dest), https.encodeCode);
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udp.httpsProxy_encodeCode = https.encodeCode;
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}
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udp.http_request_len = default_ssl_request_len;
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copy_new_mem(default_ssl_request, default_ssl_request_len, &udp.http_request);
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udp.http_request = replace(udp.http_request, &udp.http_request_len, "[H]", 3, dest, strlen(dest));
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memcpy(&udp.dst, &https.dst, sizeof(udp.dst));
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}
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if (udp.http_request == NULL)
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errors("out of memory.");
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/* 保存原始生成的请求头，配合usr_hdr使用 */
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if (saveHdrs) {
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if (copy_new_mem(udp.http_request, udp.http_request_len, &udp.original_http_request) != 0)
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errors("out of memory.");
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udp.original_http_request_len = udp.http_request_len;
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}
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}
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void udp_init()
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{
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int i;
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//初始化http请求
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http_udp_req_init();
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//初始化结构体
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memset(client_info_list, 0, sizeof(info_t) * MAX_CLIENT_INFO);
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||
for (i = 0; i < MAX_CLIENT_INFO; i++)
|
||
client_info_list[i].server_fd = client_info_list[i].responseClientFd = -1;
|
||
//创建epoll fd
|
||
udp_efd = epoll_create(MAX_CLIENT_INFO * 2 + 1);
|
||
if (udp_efd < 0) {
|
||
perror("udp epoll_create()");
|
||
exit(1);
|
||
}
|
||
//添加监听socket到epoll
|
||
fcntl(global.udp_listen_fd, F_SETFL, O_NONBLOCK);
|
||
udp_ev.data.fd = global.udp_listen_fd;
|
||
udp_ev.events = EPOLLIN;
|
||
epoll_ctl(udp_efd, EPOLL_CTL_ADD, global.udp_listen_fd, &udp_ev);
|
||
}
|
||
|
||
void *udp_loop(void *nullPtr)
|
||
{
|
||
int n;
|
||
|
||
while (1) {
|
||
n = epoll_wait(udp_efd, udp_evs, MAX_CLIENT_INFO * 2 + 1, -1);
|
||
while (n-- > 0) {
|
||
if (udp_evs[n].data.fd == global.udp_listen_fd) {
|
||
new_client();
|
||
} else {
|
||
if (udp_evs[n].events & EPOLLIN) {
|
||
recvServer((info_t *) udp_evs[n].data.ptr);
|
||
}
|
||
if (udp_evs[n].events & EPOLLOUT) {
|
||
outEvent((info_t *) udp_evs[n].data.ptr);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return NULL; //消除编译警告
|
||
}
|