From 4aa2eea6b3115cab6f3165c4391d523d5df61e51 Mon Sep 17 00:00:00 2001 From: Simon Ruderich Date: Mon, 7 Mar 2011 01:31:16 +0100 Subject: [PATCH] src/*: Split src/tlsproxy.c in several files. --- src/Makefile.am | 2 +- src/connection.c | 380 +++++++++++++++++++++++++++++++++++++++++++++++ src/connection.h | 25 ++++ src/tlsproxy.c | 356 +------------------------------------------- src/tlsproxy.h | 27 ++++ 5 files changed, 436 insertions(+), 354 deletions(-) create mode 100644 src/connection.c create mode 100644 src/connection.h create mode 100644 src/tlsproxy.h diff --git a/src/Makefile.am b/src/Makefile.am index f7fd084..d997f84 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -1,2 +1,2 @@ bin_PROGRAMS = tlsproxy -tlsproxy_SOURCES = tlsproxy.c sem.h sem.c +tlsproxy_SOURCES = tlsproxy.c tlsproxy.h sem.h sem.c connection.h connection.c diff --git a/src/connection.c b/src/connection.c new file mode 100644 index 0000000..65714c7 --- /dev/null +++ b/src/connection.c @@ -0,0 +1,380 @@ +/* + * Handle connections. + * + * Copyright (C) 2011 Simon Ruderich + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include + +#include +#include +#include +/* close() */ +#include +/* getaddrinfo() */ +#include +/* poll() */ +#include + +#include "connection.h" +#include "tlsproxy.h" + + +/* Maximum line of the request line. Longer request lines are aborted with an + * error. The standard doesn't specify a maximum line length but this should + * be a good limit to make processing simpler. */ +#define MAX_REQUEST_LINE 4096 + + +static int read_http_request(FILE *client_fd, char *request, size_t length); +static void send_close_bad_request(FILE *client_fd); +static void send_close_forwarding_failure(FILE *client_fd); + +static void transfer_data(int client, int server); +static int read_from_write_to(int from, int to); + +static int connect_to_host(const char *hostname, const char *port); + +static int parse_request(const char *buffer, char *host, char *port, + int *version_minor); + + +void handle_connection(int client_socket) { + int server_socket; + FILE *client_fd, *server_fd; + + char buffer[MAX_REQUEST_LINE]; + char host[MAX_REQUEST_LINE]; + char port[5 + 1]; + + int version_minor; + int result; + + client_fd = fdopen(client_socket, "a+"); + if (NULL == client_fd) { + perror("fdopen()"); + close(client_socket); + return; + } + +#ifdef DEBUG + printf("New connection:\n"); +#endif + + /* Read request line (CONNECT ..) and headers (they are discarded). */ + result = read_http_request(client_fd, buffer, sizeof(buffer)); + if (result == -1) { + /* Read error. */ + return; + } else if (result == -2) { + /* EOF */ + send_close_bad_request(client_fd); + return; + } + +#ifdef DEBUG + printf(" request: %s", buffer); +#endif + + if (0 != parse_request(buffer, host, port, &version_minor)) { + send_close_bad_request(client_fd); +#ifdef DEBUG + printf(" bad request\n"); +#endif + return; + } + +#ifdef DEBUG + printf(" %s:%s (HTTP 1.%d)\n", host, port, version_minor); +#endif + + /* Connect to proxy server or directly to server. */ + if (NULL != use_proxy_host && NULL != use_proxy_port) { + server_socket = connect_to_host(use_proxy_host, use_proxy_port); + } else { + server_socket = connect_to_host(host, port); + } + + if (-1 == server_socket) { + send_close_forwarding_failure(client_fd); + return; + } + server_fd = fdopen(server_socket, "a+"); + if (NULL == server_fd) { + send_close_forwarding_failure(client_fd); + return; + } + + /* Connect to proxy if requested (command line option). */ + if (NULL != use_proxy_host && NULL != use_proxy_port) { + fprintf(server_fd, "CONNECT %s:%s HTTP/1.0\r\n", host, port); + fprintf(server_fd, "\r\n"); + + /* Read response line from proxy server. */ + result = read_http_request(server_fd, buffer, sizeof(buffer)); + if (result == -1) { + /* Read error. */ + send_close_forwarding_failure(client_fd); + return; + } else if (result == -2) { + /* EOF */ + fclose(server_fd); + send_close_forwarding_failure(client_fd); + return; + } + + /* Check response of proxy server. */ + if (0 != strncmp(buffer, "HTTP/1.0 200", 12)) { +#ifdef DEBUG + printf(" bad proxy response\n"); +#endif + fclose(server_fd); + send_close_forwarding_failure(client_fd); + return; + } + } + +#ifdef DEBUG + printf(" connection to server established\n"); +#endif + + /* We've established a connection, tell the client. */ + fprintf(client_fd, "HTTP/1.0 200 Connection established\r\n"); + fprintf(client_fd, "\r\n"); + fflush(client_fd); + + /* And transfer all data between client and server transparently. */ + transfer_data(client_socket, server_socket); + + fclose(client_fd); + fclose(server_fd); +} + +/* Read HTTP request line and headers (ignored). + * + * On success 0 is returned, -1 on client error (we close client descriptor in + * this case), -2 on unexpected EOF. + */ +static int read_http_request(FILE *client_fd, char *request, size_t length) { + char buffer[MAX_REQUEST_LINE]; + + if (NULL == fgets(request, (int)length, client_fd)) { + if (ferror(client_fd)) { + perror("fgets(), request"); + fclose(client_fd); + return -1; + } + + return -2; + } + + while (NULL != fgets(buffer, MAX_REQUEST_LINE, client_fd)) { + /* End of header. */ + if (0 == strcmp(buffer, "\n") || 0 == strcmp(buffer, "\r\n")) { + break; + } + } + if (ferror(client_fd)) { + perror("fgets(), header"); + fclose(client_fd); + return -1; + } + + return 0; +} + +static void send_close_bad_request(FILE *client_fd) { + fprintf(client_fd, "HTTP/1.0 400 Bad Request\r\n"); + fprintf(client_fd, "\r\n"); + fclose(client_fd); +} +static void send_close_forwarding_failure(FILE *client_fd) { + fprintf(client_fd, "HTTP/1.0 503 Forwarding failure\r\n"); + fprintf(client_fd, "\r\n"); + fclose(client_fd); +} + + +/* Transfer data between client and server sockets until one closes the + * connection. */ +static void transfer_data(int client, int server) { + struct pollfd fds[2]; + fds[0].fd = client; + fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR; + fds[0].revents = 0; + fds[1].fd = server; + fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR; + fds[1].revents = 0; + + for (;;) { + int result = poll(fds, 2, -1 /* no timeout */); + if (result < 0) { + perror("poll()"); + return; + } + + /* Data available from client. */ + if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { + if (0 != read_from_write_to(client, server)) { + /* EOF (or other error) */ + break; + } + } + /* Data available from server. */ + if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) { + if (0 != read_from_write_to(server, client)) { + /* EOF (or other error) */ + break; + } + } + + /* Client closed connection. */ + if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) { + break; + } + /* Server closed connection. */ + if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) { + break; + } + } +} + +/* Read available data from socket from and write it to socket to. At maximum + * 4096 bytes are read/written. */ +static int read_from_write_to(int from, int to) { + ssize_t size_read; + ssize_t size_written; + char buffer[4096]; + + size_read = read(from, buffer, sizeof(buffer)); + if (0 > size_read) { + perror("read()"); + return -1; + } + /* EOF */ + if (0 == size_read) { + return -1; + } + + size_written = write(to, buffer, (size_t)size_read); + if (0 > size_written) { + perror("write()"); + return -1; + } + if (size_read != size_written) { + printf("only written %ld of %ld bytes!\n", (long int)size_read, + (long int)size_written); + return -1; + } + + return 0; +} + + +static int connect_to_host(const char *hostname, const char *port) { + struct addrinfo gai_hints; + struct addrinfo *gai_result; + int gai_return; + + int server_socket; + struct addrinfo *server; + + if (NULL == hostname || NULL == port) { + return -1; + } + + /* Get IP of hostname server. */ + memset(&gai_hints, 0, sizeof(gai_hints)); + gai_hints.ai_family = AF_UNSPEC; + gai_hints.ai_socktype = SOCK_STREAM; + gai_hints.ai_protocol = 0; + gai_hints.ai_flags = AI_NUMERICSERV /* given port is numeric */ + | AI_ADDRCONFIG /* supported by this computer */ + | AI_V4MAPPED; /* support IPv4 through IPv6 */ + gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result); + if (0 != gai_return) { + perror("getaddrinfo()"); + return -1; + } + + /* Now try to connect to each server returned by getaddrinfo(), use the + * first successful connect. */ + for (server = gai_result; NULL != server; server = server->ai_next) { + server_socket = socket(server->ai_family, + server->ai_socktype, + server->ai_protocol); + if (-1 == server_socket) { + perror("socket(), trying next"); + continue; + } + + if (-1 != connect(server_socket, server->ai_addr, + server->ai_addrlen)) { + break; + } + perror("connect(), trying next"); + + close(server_socket); + } + /* Make sure we free the result from getaddrinfo(). */ + freeaddrinfo(gai_result); + + if (NULL == server) { + fprintf(stderr, "no server found, aborting\n"); + return -1; + } + + return server_socket; +} + + +/* Parse HTTP CONNECT request string and save its parameters. + * + * The following format is expected: "CONNECT host:port HTTP/1.y". + * + * request and host must have the same size! port must be at least 6 bytes + * long (5 + '\0'). + */ +static int parse_request(const char *request, char *host, char *port, + int *version_minor) { + int port_unused; /* just used to verify the port is numeric */ + char *position; + + /* scanf() doesn't check spaces. */ + if (0 != strncmp(request, "CONNECT ", 8)) { + return -1; + } + /* Check request and extract data, "host:port" is not yet separated. */ + if (2 != sscanf(request, "CONNECT %s HTTP/1.%d", + host, version_minor)) { + return -1; + } + /* Make sure ":port" is there. */ + if (NULL == (position = strchr(host, ':'))) { + return -1; + } + /* Make sure port is numeric. */ + if (1 != sscanf(position + 1, "%d", &port_unused)) { + return -1; + } + /* Store it in *port. */ + strncpy(port, position + 1, 5); + port[5] = '\0'; + /* And remove port from host. */ + *position = '\0'; + + return 0; +} diff --git a/src/connection.h b/src/connection.h new file mode 100644 index 0000000..7271112 --- /dev/null +++ b/src/connection.h @@ -0,0 +1,25 @@ +/* + * Handle connections. + * + * Copyright (C) 2011 Simon Ruderich + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#ifndef CONNECTION_H +#define CONNECTION_H + +void handle_connection(int socket); + +#endif diff --git a/src/tlsproxy.c b/src/tlsproxy.c index 6fe9dfa..ab9c6df 100644 --- a/src/tlsproxy.c +++ b/src/tlsproxy.c @@ -21,6 +21,7 @@ #include #include +#include /* socket(), bind(), accept(), listen() */ #include #include @@ -28,25 +29,16 @@ #include /* htons() */ #include -/* getaddrinfo() */ -#include -/* strncmp() */ -#include /* sigaction() */ #include -/* poll() */ -#include /* errno */ #include /* pthread_*() */ #include +#include "tlsproxy.h" #include "sem.h" - -/* Maximum line of the request line. Longer request lines are aborted with an - * error. The standard doesn't specify a maximum line length but this should - * be a good limit to make processing simpler. */ -#define MAX_REQUEST_LINE 4096 +#include "connection.h" /* Size of ringbuffer. */ #define RINGBUFFER_SIZE 10 @@ -64,9 +56,6 @@ static int ringbuffer_write; static SEM *ringbuffer_full; /* At least one element in the buffer? */ static SEM *ringbuffer_free; /* Space for another element in the buffer? */ static SEM *ringbuffer_lock; /* Read lock. */ -/* Proxy hostname and port if specified on the command line. */ -static char *use_proxy_host; -static char *use_proxy_port; static void sigint_handler(int signal); @@ -75,18 +64,6 @@ static void parse_arguments(int argc, char **argv); static void print_usage(const char *argv); static void worker_thread(void); -static void handle_connection(int socket); -static int read_http_request(FILE *client_fd, char *request, size_t length); -static void send_close_bad_request(FILE *client_fd); -static void send_close_forwarding_failure(FILE *client_fd); - -static void transfer_data(int client, int server); -static int read_from_write_to(int from, int to); - -static int connect_to_host(const char *hostname, const char *port); - -static int parse_request(const char *buffer, char *host, char *port, - int *version_minor); int main(int argc, char **argv) { @@ -323,330 +300,3 @@ static void worker_thread(void) { handle_connection(client_socket); } } - -static void handle_connection(int client_socket) { - int server_socket; - FILE *client_fd, *server_fd; - - char buffer[MAX_REQUEST_LINE]; - char host[MAX_REQUEST_LINE]; - char port[5 + 1]; - - int version_minor; - int result; - - client_fd = fdopen(client_socket, "a+"); - if (NULL == client_fd) { - perror("fdopen()"); - close(client_socket); - return; - } - -#ifdef DEBUG - printf("New connection:\n"); -#endif - - /* Read request line (CONNECT ..) and headers (they are discarded). */ - result = read_http_request(client_fd, buffer, sizeof(buffer)); - if (result == -1) { - /* Read error. */ - return; - } else if (result == -2) { - /* EOF */ - send_close_bad_request(client_fd); - return; - } - -#ifdef DEBUG - printf(" request: %s", buffer); -#endif - - if (0 != parse_request(buffer, host, port, &version_minor)) { - send_close_bad_request(client_fd); -#ifdef DEBUG - printf(" bad request\n"); -#endif - return; - } - -#ifdef DEBUG - printf(" %s:%s (HTTP 1.%d)\n", host, port, version_minor); -#endif - - /* Connect to proxy server or directly to server. */ - if (NULL != use_proxy_host && NULL != use_proxy_port) { - server_socket = connect_to_host(use_proxy_host, use_proxy_port); - } else { - server_socket = connect_to_host(host, port); - } - - if (-1 == server_socket) { - send_close_forwarding_failure(client_fd); - return; - } - server_fd = fdopen(server_socket, "a+"); - if (NULL == server_fd) { - send_close_forwarding_failure(client_fd); - return; - } - - /* Connect to proxy if requested (command line option). */ - if (NULL != use_proxy_host && NULL != use_proxy_port) { - fprintf(server_fd, "CONNECT %s:%s HTTP/1.0\r\n", host, port); - fprintf(server_fd, "\r\n"); - - /* Read response line from proxy server. */ - result = read_http_request(server_fd, buffer, sizeof(buffer)); - if (result == -1) { - /* Read error. */ - send_close_forwarding_failure(client_fd); - return; - } else if (result == -2) { - /* EOF */ - fclose(server_fd); - send_close_forwarding_failure(client_fd); - return; - } - - /* Check response of proxy server. */ - if (0 != strncmp(buffer, "HTTP/1.0 200", 12)) { -#ifdef DEBUG - printf(" bad proxy response\n"); -#endif - fclose(server_fd); - send_close_forwarding_failure(client_fd); - return; - } - } - -#ifdef DEBUG - printf(" connection to server established\n"); -#endif - - /* We've established a connection, tell the client. */ - fprintf(client_fd, "HTTP/1.0 200 Connection established\r\n"); - fprintf(client_fd, "\r\n"); - fflush(client_fd); - - /* And transfer all data between client and server transparently. */ - transfer_data(client_socket, server_socket); - - fclose(client_fd); - fclose(server_fd); -} - -/* Read HTTP request line and headers (ignored). - * - * On success 0 is returned, -1 on client error (we close client descriptor in - * this case), -2 on unexpected EOF. - */ -static int read_http_request(FILE *client_fd, char *request, size_t length) { - char buffer[MAX_REQUEST_LINE]; - - if (NULL == fgets(request, (int)length, client_fd)) { - if (ferror(client_fd)) { - perror("fgets(), request"); - fclose(client_fd); - return -1; - } - - return -2; - } - - while (NULL != fgets(buffer, MAX_REQUEST_LINE, client_fd)) { - /* End of header. */ - if (0 == strcmp(buffer, "\n") || 0 == strcmp(buffer, "\r\n")) { - break; - } - } - if (ferror(client_fd)) { - perror("fgets(), header"); - fclose(client_fd); - return -1; - } - - return 0; -} - -static void send_close_bad_request(FILE *client_fd) { - fprintf(client_fd, "HTTP/1.0 400 Bad Request\r\n"); - fprintf(client_fd, "\r\n"); - fclose(client_fd); -} -static void send_close_forwarding_failure(FILE *client_fd) { - fprintf(client_fd, "HTTP/1.0 503 Forwarding failure\r\n"); - fprintf(client_fd, "\r\n"); - fclose(client_fd); -} - - -/* Transfer data between client and server sockets until one closes the - * connection. */ -static void transfer_data(int client, int server) { - struct pollfd fds[2]; - fds[0].fd = client; - fds[0].events = POLLIN | POLLPRI | POLLHUP | POLLERR; - fds[0].revents = 0; - fds[1].fd = server; - fds[1].events = POLLIN | POLLPRI | POLLHUP | POLLERR; - fds[1].revents = 0; - - for (;;) { - int result = poll(fds, 2, -1 /* no timeout */); - if (result < 0) { - perror("poll()"); - return; - } - - /* Data available from client. */ - if (fds[0].revents & POLLIN || fds[0].revents & POLLPRI) { - if (0 != read_from_write_to(client, server)) { - /* EOF (or other error) */ - break; - } - } - /* Data available from server. */ - if (fds[1].revents & POLLIN || fds[1].revents & POLLPRI) { - if (0 != read_from_write_to(server, client)) { - /* EOF (or other error) */ - break; - } - } - - /* Client closed connection. */ - if (fds[0].revents & POLLERR || fds[0].revents & POLLHUP) { - break; - } - /* Server closed connection. */ - if (fds[1].revents & POLLERR || fds[1].revents & POLLHUP) { - break; - } - } -} - -/* Read available data from socket from and write it to socket to. At maximum - * 4096 bytes are read/written. */ -static int read_from_write_to(int from, int to) { - ssize_t size_read; - ssize_t size_written; - char buffer[4096]; - - size_read = read(from, buffer, sizeof(buffer)); - if (0 > size_read) { - perror("read()"); - return -1; - } - /* EOF */ - if (0 == size_read) { - return -1; - } - - size_written = write(to, buffer, (size_t)size_read); - if (0 > size_written) { - perror("write()"); - return -1; - } - if (size_read != size_written) { - printf("only written %ld of %ld bytes!\n", (long int)size_read, - (long int)size_written); - return -1; - } - - return 0; -} - - -static int connect_to_host(const char *hostname, const char *port) { - struct addrinfo gai_hints; - struct addrinfo *gai_result; - int gai_return; - - int server_socket; - struct addrinfo *server; - - if (NULL == hostname || NULL == port) { - return -1; - } - - /* Get IP of hostname server. */ - memset(&gai_hints, 0, sizeof(gai_hints)); - gai_hints.ai_family = AF_UNSPEC; - gai_hints.ai_socktype = SOCK_STREAM; - gai_hints.ai_protocol = 0; - gai_hints.ai_flags = AI_NUMERICSERV /* given port is numeric */ - | AI_ADDRCONFIG /* supported by this computer */ - | AI_V4MAPPED; /* support IPv4 through IPv6 */ - gai_return = getaddrinfo(hostname, port, &gai_hints, &gai_result); - if (0 != gai_return) { - perror("getaddrinfo()"); - return -1; - } - - /* Now try to connect to each server returned by getaddrinfo(), use the - * first successful connect. */ - for (server = gai_result; NULL != server; server = server->ai_next) { - server_socket = socket(server->ai_family, - server->ai_socktype, - server->ai_protocol); - if (-1 == server_socket) { - perror("socket(), trying next"); - continue; - } - - if (-1 != connect(server_socket, server->ai_addr, - server->ai_addrlen)) { - break; - } - perror("connect(), trying next"); - - close(server_socket); - } - /* Make sure we free the result from getaddrinfo(). */ - freeaddrinfo(gai_result); - - if (NULL == server) { - fprintf(stderr, "no server found, aborting\n"); - return -1; - } - - return server_socket; -} - - -/* Parse HTTP CONNECT request string and save its parameters. - * - * The following format is expected: "CONNECT host:port HTTP/1.y". - * - * request and host must have the same size! port must be at least 6 bytes - * long (5 + '\0'). - */ -static int parse_request(const char *request, char *host, char *port, - int *version_minor) { - int port_unused; /* just used to verify the port is numeric */ - char *position; - - /* scanf() doesn't check spaces. */ - if (0 != strncmp(request, "CONNECT ", 8)) { - return -1; - } - /* Check request and extract data, "host:port" is not yet separated. */ - if (2 != sscanf(request, "CONNECT %s HTTP/1.%d", - host, version_minor)) { - return -1; - } - /* Make sure ":port" is there. */ - if (NULL == (position = strchr(host, ':'))) { - return -1; - } - /* Make sure port is numeric. */ - if (1 != sscanf(position + 1, "%d", &port_unused)) { - return -1; - } - /* Store it in *port. */ - strncpy(port, position + 1, 5); - port[5] = '\0'; - /* And remove port from host. */ - *position = '\0'; - - return 0; -} diff --git a/src/tlsproxy.h b/src/tlsproxy.h new file mode 100644 index 0000000..513964c --- /dev/null +++ b/src/tlsproxy.h @@ -0,0 +1,27 @@ +/* + * Global variables. + * + * Copyright (C) 2011 Simon Ruderich + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#ifndef TLSPROXY_H +#define TLSPROXY_H + +/* Proxy hostname and port if specified on the command line. */ +char *use_proxy_host; +char *use_proxy_port; + +#endif -- 2.43.2