603 lines
17 KiB
C
603 lines
17 KiB
C
#include "http.h"
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#include "dns.h"
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#define HTTP_TYPE 0
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#define OTHER_TYPE 1
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conn_t cts[MAX_CONNECTION];
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static char ssl_rsp[] = "HTTP/1.1 200 Connection established\r\n\r\n";
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char *local_header, *proxy_header, *ssl_proxy;
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int lisFd, proxy_header_len, local_header_len;
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uint8_t strict_spilce, encodeCode;
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/* 对数据进行编码 */
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static void dataEncode(char *data, int data_len)
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{
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while (data_len-- > 0)
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data[data_len] ^= encodeCode;
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}
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int8_t connectionToServer(char *ip, conn_t *server)
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{
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server->fd = socket(AF_INET, SOCK_STREAM, 0);
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if (server->fd < 0)
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return 1;
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fcntl(server->fd, F_SETFL, O_NONBLOCK);
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addr.sin_addr.s_addr = inet_addr(ip);
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addr.sin_port = htons(server->destPort);
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if (connect(server->fd, (struct sockaddr *)&addr, sizeof(addr)) != 0 && errno != EINPROGRESS)
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return 1;
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ev.data.ptr = server;
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ev.events = EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP|EPOLLET;
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epoll_ctl(efd, EPOLL_CTL_ADD, server->fd, &ev);
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return 0;
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}
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void close_connection(conn_t *conn)
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{
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epoll_ctl(efd, 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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{
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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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}
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else
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{
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struct dns *d;
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d = dns_list + ((conn - cts) >> 1);
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d->request_len = d->sent_len = 0;
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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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/* 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 ||
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strncmp(data, "TRACE", 5) == 0 ||
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strncmp(data, "DELETE", 6) == 0 ||
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strncmp(data, "LINK", 4) == 0 ||
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strncmp(data, "UNLINK", 6) == 0 ||
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strncmp(data, "PATCH", 5) == 0 ||
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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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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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{
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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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{
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if (read_len == 0 || *data_len == 0 || errno != EAGAIN)
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{
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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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static char *get_host(char *data)
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{
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char *hostEnd, *host;
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host = strstr(data, local_header);
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if (host != NULL)
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{
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char *local_host;
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host += local_header_len;
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while (*host == ' ')
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host++;
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for (hostEnd = host; *hostEnd < 58 && *hostEnd > 48; hostEnd++);
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//判断该头域是否正确使用
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if (hostEnd - host > 5 || *hostEnd != '\r')
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return NULL;
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local_host = (char *)malloc(16);
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if (local_host == NULL)
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return NULL;
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strcpy(local_host, "127.0.0.1:");
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memcpy(local_host + 10, host, hostEnd - host);
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local_host[10 + (hostEnd - host)] = '\0';
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return local_host;
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}
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host= strstr(data, proxy_header);
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if (host == NULL)
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return NULL;
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host += proxy_header_len;
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while (*host == ' ')
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host++;
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hostEnd = strchr(host, '\r');
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if (hostEnd)
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{
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if (encodeCode)
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dataEncode(host, hostEnd - host);
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return strndup(host, hostEnd - host);
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}
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else
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{
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if (encodeCode)
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dataEncode(host, strlen(host));
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return strdup(host);
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}
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}
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/* 删除请求头中的头域 */
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static void del_hdr(char *header, int *header_len)
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{
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char *key_end, *line_begin, *line_end;
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int key_len;
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for (line_begin = strchr(header, '\n'); line_begin++ && *line_begin != '\r'; line_begin = line_end)
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{
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key_end = strchr(line_begin, ':');
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if (key_end == NULL)
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return;
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key_len = key_end - line_begin;
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line_end = strchr(key_end, '\n');
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if (strncasecmp(line_begin, "host", key_len) == 0 || strncmp(line_begin, local_header + 1, key_len) == 0 || strncmp(line_begin, proxy_header + 1, key_len) == 0)
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{
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if (line_end++)
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{
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memmove(line_begin, line_end, *header_len - (line_end - header) + 1);
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(*header_len) -= line_end - line_begin;
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line_end = line_begin - 1; //新行前一个字符
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}
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else
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{
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*line_begin = '\0';
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*header_len = line_begin - header;
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return;
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}
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}
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}
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}
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/* 对请求头中的Referer头域进行编码 */
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static void encodeReferer(char *request)
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{
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char *referer_key, *referer_value, *line, *pr;
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for (line = strchr(request, '\n'); (referer_key = strstr(line, "\nReferer:")) != NULL || (referer_key = strstr(line, "\nreferer:")) != NULL; line = pr + 1)
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{
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referer_value = referer_key + sizeof("\nReferer:") - 1;
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while (*referer_value == ' ')
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referer_value++;
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pr = strchr(referer_value, '\r');
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if (pr)
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dataEncode(referer_value, pr - referer_value);
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else
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dataEncode(referer_value, strlen(referer_value));
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}
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}
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/* 构建新请求头 */
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static char *build_request(char *client_data, int *data_len, char *host)
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{
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char *uri, *url, *p, *lf, *header, *new_data, *proxy_host;
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int len;
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header = client_data;
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proxy_host = host;
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do {
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del_hdr(client_data, data_len);
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/* 将完整url转换为uri */
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url = strchr(header, ' ');
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lf = strchr(header, '\n');
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if (url == NULL || lf == NULL || lf - 10 <= header)
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return client_data;
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if (url < lf && *(++url) != '/')
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{
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uri = strchr(url + 7, '/');
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p = lf - 10; //指向HTTP版本前面的空格
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if (uri != NULL && uri < p)
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{
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memmove(url, uri, *data_len - (uri - client_data) + 1);
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*data_len -= uri - url;
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lf -= uri - url;
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}
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else
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{
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*url++ = '/';
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memmove(url, p, *data_len - (p - client_data) + 1);
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*data_len -= p - url;
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lf -= p - url;
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}
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if (encodeCode)
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dataEncode(url + 1, lf - 10 - (url + 1));
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}
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else if (url < lf && encodeCode)
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{
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dataEncode(url + 1, lf - 10 - (url + 1));
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}
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*data_len += strlen(proxy_host) + 8; //8为 "Host: " + "\r\n"的长度
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new_data = (char *)malloc(*data_len + 1);
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if (new_data == NULL)
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{
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if (proxy_host != host)
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free(proxy_host);
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free(client_data);
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return NULL;
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}
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/* 请求行后面添加Host行 */
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len = lf + 1 - client_data;
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memcpy(new_data, client_data, len); //复制请求行
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strcpy(new_data + len, "Host: ");
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strcpy(new_data + len + 6, proxy_host);
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len += strlen(proxy_host) + 6;
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new_data[len++] = '\r';
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new_data[len++] = '\n';
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//len += sprintf(new_data + len, "Host: %s\r\n", proxy_host);
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memcpy(new_data + len, lf + 1, *data_len - len + 1);
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free(client_data);
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if (proxy_host != host)
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free(proxy_host);
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if (encodeCode)
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encodeReferer(new_data);
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if (strict_spilce == 0)
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return new_data;
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client_data = new_data;
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//如果请求头只有一个头域，则必须-1才能搜索到\n\r
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header = strstr(client_data + len - 1, "\n\r");
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//如果是连续的多个请求头，则全部修改
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if (header == NULL || request_type(header + 3) == OTHER_TYPE)
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return client_data;
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header += 3;
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proxy_host = get_host(header);
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if (proxy_host == NULL)
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proxy_host = host;
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} while (1);
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}
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/* 解析Host */
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int8_t parse_host(conn_t *server, char *host)
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{
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char *port, *p;
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port = strchr(host, ':');
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if (port)
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{
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server->destPort = atoi(port+1);
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*port = '\0';
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}
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else
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server->destPort = 80; //默认80端口
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for (p = host; (*p > 47 && *p < 58) || *p == '.'; p++);
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if (*p == '\0')
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{
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if (connectionToServer(host, server) != 0)
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return 1;
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}
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else if (build_dns_req(dns_list + ((server - cts) >> 1), host) == -1)
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return 1;
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if (port)
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*port = ':';
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return 0;
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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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if (ct->ready_data)
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{
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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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}
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else
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{
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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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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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errno = 0;
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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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{
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if (encodeCode) //对服务端的数据编码
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dataEncode(server->ready_data, server->ready_data_len);
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write_len = write(client->fd, server->ready_data, server->ready_data_len);
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if (write_len == -1)
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{
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if (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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}
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else if (write_len < server->ready_data_len)
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{
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server->sent_len = write_len;
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ev.events = EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP|EPOLLET;
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ev.data.ptr = client;
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epoll_ctl(efd, 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 || (errno != EAGAIN && errno != 0))
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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 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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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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{
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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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{
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serverToClient(from);
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if (from->fd >= 0 && from->ready_data_len == 0)
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{
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ev.events = EPOLLIN|EPOLLERR|EPOLLHUP|EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(efd, EPOLL_CTL_MOD, to->fd, &ev);
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}
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}
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else
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{
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ev.events = EPOLLIN|EPOLLERR|EPOLLHUP|EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(efd, 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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}
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else if (write_len > 0)
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{
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from->sent_len += write_len;
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ev.events = EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP|EPOLLET;
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ev.data.ptr = to;
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epoll_ctl(efd, EPOLL_CTL_MOD, to->fd, &ev);
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}
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else if (errno != EAGAIN)
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{
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close_connection(to);
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}
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}
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void tcp_in(conn_t *in)
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{
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conn_t *server;
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char *host, *headerEnd;
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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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{
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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->incomplete_data = read_data(in, in->incomplete_data, &in->incomplete_data_len);
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if (in->incomplete_data == NULL)
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{
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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 (in->request_type == OTHER_TYPE)
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{
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if (encodeCode)
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dataEncode(in->incomplete_data, in->incomplete_data_len);
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//如果是第一次读取数据，并且不是HTTP请求的，关闭连接。复制数据失败的也关闭连接
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if (in->reread_data == 0 || copy_data(in) != 0)
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{
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close_connection(in);
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return;
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}
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goto handle_data_complete;
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}
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headerEnd = strstr(in->incomplete_data, "\n\r\n");
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//请求头不完整，等待下次读取
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if (headerEnd == NULL)
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return;
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headerEnd += 3;
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if (encodeCode)
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dataEncode(headerEnd, in->incomplete_data_len - (headerEnd - in->incomplete_data));
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host = get_host(in->incomplete_data);
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if (host == NULL)
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{
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close_connection(in);
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return;
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}
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/* 第一次读取数据 */
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if (in->reread_data == 0)
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{
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in->reread_data = 1;
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if (parse_host(server, host) != 0)
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{
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free(host);
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close_connection(in);
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return;
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}
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if (strstr(in->incomplete_data, ssl_proxy))
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{
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server->is_ssl = in->is_ssl = 1;
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/* 这时候即使fd是非阻塞也只需要判断返回值是否小于0 */
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if (write(in->fd, ssl_rsp, sizeof(ssl_rsp) - 1) < 0)
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{
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free(host);
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close_connection(in);
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return;
|
||
}
|
||
if (headerEnd - in->incomplete_data < in->incomplete_data_len)
|
||
{
|
||
in->incomplete_data_len -= headerEnd - in->incomplete_data;
|
||
memmove(in->incomplete_data, headerEnd, in->incomplete_data_len + 1);
|
||
if (request_type(in->incomplete_data) == OTHER_TYPE)
|
||
{
|
||
copy_data(in);
|
||
free(host);
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
//如果是CONNECT代理HTTP,需要重新获取host
|
||
char *save_host = host;
|
||
host = get_host(in->incomplete_data);
|
||
if (!host)
|
||
host = save_host;
|
||
else
|
||
free(save_host);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
free(in->incomplete_data);
|
||
in->incomplete_data = NULL;
|
||
in->incomplete_data_len = 0;
|
||
free(host);
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
in->incomplete_data = build_request(in->incomplete_data, &in->incomplete_data_len, host);
|
||
free(host);
|
||
if (in->incomplete_data == NULL || copy_data(in) != 0)
|
||
{
|
||
close_connection(in);
|
||
return;
|
||
}
|
||
//数据处理完毕，可以发送
|
||
handle_data_complete:
|
||
//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
|
||
if (server->fd >= 0)
|
||
tcp_out(server);
|
||
}
|
||
|
||
void *accept_loop(void *ptr)
|
||
{
|
||
struct epoll_event epollEvent;
|
||
conn_t *client;
|
||
|
||
if (encodeCode)
|
||
dataEncode(ssl_rsp, sizeof(ssl_rsp) - 1);
|
||
epollEvent.events = EPOLLIN|EPOLLET;
|
||
while (1)
|
||
{
|
||
/* 偶数为客户端，奇数为服务端 */
|
||
for (client = cts; client - cts < MAX_CONNECTION; client += 2)
|
||
if (client->fd < 0)
|
||
break;
|
||
if (client - cts >= MAX_CONNECTION)
|
||
{
|
||
sleep(3);
|
||
continue;
|
||
}
|
||
while ((client->fd = accept(lisFd, (struct sockaddr *)&addr, &addr_len)) < 0);
|
||
fcntl(client->fd, F_SETFL, O_NONBLOCK);
|
||
epollEvent.data.ptr = client;
|
||
epoll_ctl(efd, EPOLL_CTL_ADD, client->fd, &epollEvent);
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
void create_listen(char *ip, int port)
|
||
{
|
||
int optval = 1;
|
||
|
||
if ((lisFd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
|
||
{
|
||
perror("socket");
|
||
exit(1);
|
||
}
|
||
addr.sin_port = htons(port);
|
||
addr.sin_addr.s_addr = inet_addr(ip);
|
||
if (setsockopt(lisFd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0)
|
||
{
|
||
perror("setsockopt");
|
||
exit(1);
|
||
}
|
||
if (bind(lisFd, (struct sockaddr *)&addr, sizeof(addr)) != 0)
|
||
{
|
||
perror("bind");
|
||
exit(1);
|
||
}
|
||
if (listen(lisFd, 500) != 0)
|
||
{
|
||
perror("listen");
|
||
exit(1);
|
||
}
|
||
}
|
||
|
||
|
||
|