296 lines
8.5 KiB
C
Executable File
296 lines
8.5 KiB
C
Executable File
#include "http_proxy.h"
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#include "main.h"
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int sslEncodeCode;
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int remote_port;
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char remote_host[CACHE_SIZE];
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/* 对数据进行编码 */
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void dataEncode(char *data, int data_len, unsigned code)
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{
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while (data_len-- > 0)
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data[data_len] ^= code;
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}
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static char *read_data(conn_t * in, char *data, int *data_len)
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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(data, *data_len + BUFFER_SIZE + 1);
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if (new_data == NULL) {
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free(data);
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return NULL;
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}
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data = new_data;
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read_len = read(in->fd, data + *data_len, 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 || *data_len == 0 || errno != EAGAIN) {
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free(data);
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return NULL;
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}
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break;
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}
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*data_len += read_len;
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} while (read_len == BUFFER_SIZE);
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*(data + *data_len) = '\0';
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return data;
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}
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void close_connection(conn_t * conn)
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{
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epoll_ctl(epollfd, EPOLL_CTL_DEL, conn->fd, NULL);
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close(conn->fd);
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if ((conn - cts) & 1) {
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char *server_data;
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server_data = conn->ready_data;
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memset(conn, 0, sizeof(conn_t));
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conn->ready_data = server_data;
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conn--->fd = -1;
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} else {
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free(conn->ready_data);
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free(conn->incomplete_data);
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memset(conn, 0, sizeof(conn_t));
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conn++->fd = -1;
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}
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if (conn->fd >= 0)
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close_connection(conn);
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}
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static void serverToClient(conn_t * server)
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{
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conn_t *client;
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int write_len;
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client = server - 1;
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while ((server->ready_data_len = read(server->fd, server->ready_data, BUFFER_SIZE)) > 0) {
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dataEncode(server->ready_data, server->ready_data_len, sslEncodeCode);
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write_len = write(client->fd, server->ready_data, server->ready_data_len);
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if (write_len <= 0) {
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if (write_len == 0 || errno != EAGAIN)
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close_connection(server);
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else
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server->sent_len = 0;
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return;
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} else if (write_len < server->ready_data_len) {
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server->sent_len = write_len;
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ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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ev.data.ptr = client;
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epoll_ctl(epollfd, EPOLL_CTL_MOD, client->fd, &ev);
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return;
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}
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if (server->ready_data_len < BUFFER_SIZE)
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break;
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}
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//判断是否关闭连接
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if (server->ready_data_len == 0 || (server->ready_data_len == -1 && errno != EAGAIN))
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close_connection(server);
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else
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server->ready_data_len = server->sent_len = 0;
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}
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void clientToserver(conn_t * in)
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{
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int write_len;
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conn_t *remote;
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remote = in + 1;
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write_len = write(remote->fd, in->ready_data, in->ready_data_len);
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if (write_len == in->ready_data_len) {
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in->ready_data_len = 0;
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in->ready_data = NULL;
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} else {
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close_connection(remote);
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}
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return;
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}
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// 判断请求类型
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static int8_t request_type(char *data)
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{
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if (strncmp(data, "GET", 3) == 0 ||
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strncmp(data, "POST", 4) == 0 ||
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strncmp(data, "CONNECT", 7) == 0 ||
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strncmp(data, "HEAD", 4) == 0 ||
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strncmp(data, "PUT", 3) == 0 ||
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strncmp(data, "OPTIONS", 7) == 0 ||
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strncmp(data, "MOVE", 4) == 0 ||
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strncmp(data, "COPY", 4) == 0 || strncmp(data, "TRACE", 5) == 0 || strncmp(data, "DELETE", 6) == 0 || strncmp(data, "LINK", 4) == 0 || strncmp(data, "UNLINK", 6) == 0 || strncmp(data, "PATCH", 5) == 0 || strncmp(data, "WRAPPED", 7) == 0)
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return HTTP_TYPE;
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return OTHER_TYPE;
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}
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// Check for valid IPv4 or Iv6 string. Returns AF_INET for IPv4, AF_INET6 for IPv6
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int check_ipversion(char *address)
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{
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struct in6_addr bindaddr;
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if (inet_pton(AF_INET, address, &bindaddr) == 1) {
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return AF_INET;
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} else {
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if (inet_pton(AF_INET6, address, &bindaddr) == 1) {
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return AF_INET6;
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}
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}
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return 0;
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}
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int create_connection6(char *remote_host, int remote_port)
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{
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struct addrinfo hints, *res = NULL;
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int sock;
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int validfamily = 0;
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char portstr[CACHE_SIZE];
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memset(&hints, 0x00, sizeof(hints));
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hints.ai_flags = AI_NUMERICSERV; // numeric service number, not resolve
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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sprintf(portstr, "%d", remote_port);
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// check for numeric IP to specify IPv6 or IPv4 socket
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if ((validfamily = check_ipversion(remote_host)) != 0) {
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hints.ai_family = validfamily;
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hints.ai_flags |= AI_NUMERICHOST; // remote_host是有效的数字ip，跳过解析
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}
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// 检查指定的主机是否有效。 如果remote_host是主机名，尝试解析地址
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if (getaddrinfo(remote_host, portstr, &hints, &res) != 0) {
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errno = EFAULT;
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perror("getaddrinfo");
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return -1;
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}
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if ((sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) < 0) {
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perror("socket");
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return -1;
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}
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if (connect(sock, res->ai_addr, res->ai_addrlen) < 0) {
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perror("connect");
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return -1;
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}
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if (res != NULL)
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freeaddrinfo(res);
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return sock;
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}
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/* 读取到的数据全部就绪，将incomplete_data复制到ready_data */
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static int8_t copy_data(conn_t * ct)
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{
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dataEncode(ct->incomplete_data, ct->incomplete_data_len, sslEncodeCode);
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if (ct->ready_data) {
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char *new_data;
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new_data = (char *)realloc(ct->ready_data, ct->ready_data_len + ct->incomplete_data_len);
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if (new_data == NULL)
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return 1;
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ct->ready_data = new_data;
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memcpy(new_data + ct->ready_data_len, ct->incomplete_data, ct->incomplete_data_len);
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ct->ready_data_len += ct->incomplete_data_len;
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free(ct->incomplete_data);
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} else {
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ct->ready_data = ct->incomplete_data;
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ct->ready_data_len = ct->incomplete_data_len;
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}
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ct->incomplete_data = NULL;
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ct->incomplete_data_len = 0;
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return 0;
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}
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void tcp_in(conn_t * in, conf * configure)
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{
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conn_t *server;
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if (in->fd < 0)
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return;
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//如果in - cts是奇数，那么是服务端触发事件
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if ((in - cts) & 1) {
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in->timer = (in - 1)->timer = 0;
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if (in->ready_data_len <= 0)
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serverToClient(in);
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return;
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}
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in->timer = (in + 1)->timer = 0;
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in->incomplete_data = read_data(in, in->incomplete_data, &in->incomplete_data_len);
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//printf("%s", in->incomplete_data);
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if (in->incomplete_data == NULL) {
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close_connection(in);
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return;
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}
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server = in + 1;
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server->request_type = in->request_type = request_type(in->incomplete_data);
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if (request_type(in->incomplete_data) == HTTP_TYPE) {
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in->incomplete_data = request_head(in, configure);
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server->fd = create_connection6(remote_host, remote_port);
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if (server->fd < 0)
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printf("remote->fd ERROR!\n");
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fcntl(server->fd, F_SETFL, O_NONBLOCK);
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ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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ev.data.ptr = server;
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epoll_ctl(epollfd, EPOLL_CTL_ADD, server->fd, &ev);
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}
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if (in->incomplete_data == NULL || copy_data(in) != 0) {
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close_connection(in);
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return;
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}
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// 这个判断是防止 多次读取客户端数据，但是没有和服务端建立连接，导致报错
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if (server->fd >= 0)
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tcp_out(server);
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}
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void tcp_out(conn_t * to)
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{
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conn_t *from;
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int write_len;
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if (to->fd == -1)
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return;
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else if ((to - cts) & 1)
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from = to - 1;
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else
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from = to + 1;
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from->timer = to->timer = 0;
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write_len = write(to->fd, from->ready_data + from->sent_len, from->ready_data_len - from->sent_len);
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if (write_len == from->ready_data_len - from->sent_len) {
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//服务端的数据可能没全部写入到客户端
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if ((from - cts) & 1) {
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serverToClient(from);
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if (from->fd >= 0 && from->ready_data_len == 0) {
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ev.events = EPOLLIN | EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(epollfd, EPOLL_CTL_MOD, to->fd, &ev);
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}
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} else {
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ev.events = EPOLLIN | EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(epollfd, EPOLL_CTL_MOD, to->fd, &ev);
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free(from->ready_data);
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from->ready_data = NULL;
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from->ready_data_len = 0;
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}
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} else if (write_len > 0) {
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from->sent_len += write_len;
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ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(epollfd, EPOLL_CTL_MOD, to->fd, &ev);
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} else if (errno != EAGAIN) {
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close_connection(to);
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}
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}
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