2 * tlsproxy is a transparent TLS proxy for HTTPS connections.
4 * Copyright (C) 2011 Simon Ruderich
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "connection.h"
24 /* socket(), bind(), accept(), listen() */
25 #include <sys/types.h>
26 #include <sys/socket.h>
30 #include <arpa/inet.h>
38 /* Size of ringbuffer. */
39 #define RINGBUFFER_SIZE 10
42 /* Server should shut down. Set by SIGINT handler. */
43 static volatile int done;
45 /* Number of threads. */
46 static size_t thread_count;
47 /* Synchronized ring buffer storing accept()ed client sockets. */
48 static int ringbuffer[RINGBUFFER_SIZE];
49 static int ringbuffer_read;
50 static int ringbuffer_write;
51 static SEM *ringbuffer_full; /* At least one element in the buffer? */
52 static SEM *ringbuffer_free; /* Space for another element in the buffer? */
53 static SEM *ringbuffer_lock; /* Read lock. */
56 static void sigint_handler(int signal);
58 static void parse_arguments(int argc, char **argv);
59 static void print_usage(const char *argv);
61 static void worker_thread(void);
64 int main(int argc, char **argv) {
66 int client_socket, server_socket;
67 struct sockaddr_in6 server_in;
72 struct sigaction action;
74 parse_arguments(argc, argv);
76 port = atoi(argv[argc - 1]);
77 if (0 >= port || 0xffff < port) {
79 fprintf(stderr, "\ninvalid port\n");
83 /* Setup our SIGINT signal handler which allows a "normal" termination of
85 sigemptyset(&action.sa_mask);
86 action.sa_handler = sigint_handler;
88 sigaction(SIGINT, &action, NULL);
89 /* Ignore SIGPIPEs. */
90 action.sa_handler = SIG_IGN;
91 sigaction(SIGPIPE, &action, NULL);
93 /* Initialize ring buffer. */
96 ringbuffer_full = sem_init(0);
97 ringbuffer_free = sem_init(RINGBUFFER_SIZE);
98 ringbuffer_lock = sem_init(1);
99 if (NULL == ringbuffer_full
100 || NULL == ringbuffer_free
101 || NULL == ringbuffer_lock) {
102 perror("sem_init()");
106 /* Spawn worker threads to handle requests. */
107 threads = (pthread_t *)malloc(thread_count * sizeof(pthread_t));
108 if (NULL == threads) {
109 perror("thread malloc failed");
112 for (i = 0; i < thread_count; i++) {
116 result = pthread_create(&thread, NULL,
117 (void * (*)(void *))&worker_thread,
120 printf("failed to create worker thread: %s\n", strerror(result));
127 server_socket = socket(PF_INET6, SOCK_STREAM, 0);
128 if (-1 == server_socket) {
134 /* Fast rebinding for debug mode, could cause invalid packets. */
136 int socket_option = 1;
137 setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR,
138 &socket_option, sizeof(socket_option));
142 /* Bind to the listen socket. */
143 memset(&server_in, 0, sizeof(server_in));
144 server_in.sin6_family = AF_INET6; /* IPv6 (and IPv4) */
145 server_in.sin6_addr = in6addr_any; /* bind to any address */
146 server_in.sin6_port = htons((uint16_t)port); /* port to bind to */
147 if (-1 == bind(server_socket, (struct sockaddr *)&server_in,
148 sizeof(server_in))) {
152 /* And accept connections. */
153 if (-1 == listen(server_socket, 5)) {
158 if (LOG_DEBUG <= global_log_level) {
159 printf("Listening for connections on port %d.\n", port);
161 if (NULL != global_proxy_host && NULL != global_proxy_port) {
162 printf("Using proxy: %s:%s.\n", global_proxy_host,
168 /* Accept new connection. */
169 client_socket = accept(server_socket, NULL, NULL);
170 if (-1 == client_socket) {
175 /* No lock, we only have one producer! */
177 ringbuffer[ringbuffer_write] = client_socket;
178 ringbuffer_write = (ringbuffer_write + 1) % RINGBUFFER_SIZE;
182 close(server_socket);
184 /* Poison all threads and shut them down. */
185 for (i = 0; i < thread_count; i++) {
187 ringbuffer[ringbuffer_write] = -1; /* poison */
188 ringbuffer_write = (ringbuffer_write + 1) % RINGBUFFER_SIZE;
191 for (i = 0; i < thread_count; i++) {
192 errno = pthread_join(threads[i], NULL);
194 perror("pthread_join()");
199 free(ringbuffer_full);
200 free(ringbuffer_free);
201 free(ringbuffer_lock);
205 free(global_proxy_host);
206 free(global_proxy_port);
211 static void sigint_handler(int signal_number) {
217 static void parse_arguments(int argc, char **argv) {
220 /* Default values. */
223 global_log_level = LOG_DEBUG;
225 global_log_level = LOG_WARNING;
228 while (-1 != (option = getopt(argc, argv, "d:p:t:h?"))) {
231 if (0 > atoi(optarg)) {
232 print_usage(argv[0]);
233 fprintf(stderr, "\n-d positive number required\n");
236 global_log_level = atoi(optarg);
242 /* -p must have the format host:port. */
243 if (NULL == (position = strchr(optarg, ':'))
244 || position == optarg
245 || 0 == strlen(position + 1)
246 || 0 >= atoi(position + 1)
247 || 0xffff < atoi(position + 1)) {
248 print_usage(argv[0]);
249 fprintf(stderr, "\ninvalid -p, format host:port\n");
253 global_proxy_host = malloc((size_t)(position - optarg) + 1);
254 if (NULL == global_proxy_host) {
258 memcpy(global_proxy_host, optarg, (size_t)(position - optarg));
259 global_proxy_host[position - optarg] = '\0';
261 global_proxy_port = malloc(strlen(position + 1) + 1);
262 if (NULL == global_proxy_port) {
266 strcpy(global_proxy_port, position + 1);
271 if (0 >= atoi(optarg)) {
272 print_usage(argv[0]);
273 fprintf(stderr, "\n-t positive number required\n");
276 thread_count = (size_t)atoi(optarg);
281 print_usage(argv[0]);
286 if (optind >= argc) {
287 print_usage(argv[0]);
288 fprintf(stderr, "\nport missing\n");
292 static void print_usage(const char *argv) {
293 fprintf(stderr, "Usage: %s [-d level] [-p host:port] [-t count] port\n",
295 fprintf(stderr, "\n");
296 fprintf(stderr, "-d debug level: 0=errors only, 2=debug [default: 1]\n");
297 fprintf(stderr, "-p proxy hostname and port\n");
298 fprintf(stderr, "-t number of threads [default: 10]\n");
301 static void worker_thread(void) {
305 /* Get next element from ring buffer. */
308 client_socket = ringbuffer[ringbuffer_read];
309 ringbuffer_read = (ringbuffer_read + 1) % RINGBUFFER_SIZE;
313 /* Negative value indicates we should shut down our thread. */
314 if (0 > client_socket) {
318 handle_connection(client_socket);