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);
90 /* Initialize ring buffer. */
93 ringbuffer_full = sem_init(0);
94 ringbuffer_free = sem_init(RINGBUFFER_SIZE);
95 ringbuffer_lock = sem_init(1);
96 if (NULL == ringbuffer_full
97 || NULL == ringbuffer_free
98 || NULL == ringbuffer_lock) {
103 /* Spawn worker threads to handle requests. */
104 threads = (pthread_t *)malloc(thread_count * sizeof(pthread_t));
105 if (NULL == threads) {
106 perror("thread malloc failed");
109 for (i = 0; i < thread_count; i++) {
113 result = pthread_create(&thread, NULL,
114 (void * (*)(void *))&worker_thread,
117 printf("failed to create worker thread: %s\n", strerror(result));
124 server_socket = socket(PF_INET6, SOCK_STREAM, 0);
125 if (-1 == server_socket) {
131 /* Fast rebinding for debug mode, could cause invalid packets. */
133 int socket_option = 1;
134 setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR,
135 &socket_option, sizeof(socket_option));
139 /* Bind to the listen socket. */
140 memset(&server_in, 0, sizeof(server_in));
141 server_in.sin6_family = AF_INET6; /* IPv6 (and IPv4) */
142 server_in.sin6_addr = in6addr_any; /* bind to any address */
143 server_in.sin6_port = htons((uint16_t)port); /* port to bind to */
144 if (-1 == bind(server_socket, (struct sockaddr *)&server_in,
145 sizeof(server_in))) {
149 /* And accept connections. */
150 if (-1 == listen(server_socket, 5)) {
156 printf("Listening for connections on port %d.\n", port);
158 if (NULL != use_proxy_host && NULL != use_proxy_port) {
159 printf("Using proxy: %s:%s.\n", use_proxy_host, use_proxy_port);
164 /* Accept new connection. */
165 client_socket = accept(server_socket, NULL, NULL);
166 if (-1 == client_socket) {
171 /* No lock, we only have one producer! */
173 ringbuffer[ringbuffer_write] = client_socket;
174 ringbuffer_write = (ringbuffer_write + 1) % RINGBUFFER_SIZE;
178 close(server_socket);
180 /* Poison all threads and shut them down. */
181 for (i = 0; i < thread_count; i++) {
183 ringbuffer[ringbuffer_write] = -1; /* poison */
184 ringbuffer_write = (ringbuffer_write + 1) % RINGBUFFER_SIZE;
187 for (i = 0; i < thread_count; i++) {
188 errno = pthread_join(threads[i], NULL);
190 perror("pthread_join()");
195 free(ringbuffer_full);
196 free(ringbuffer_free);
197 free(ringbuffer_lock);
201 free(use_proxy_host);
202 free(use_proxy_port);
207 static void sigint_handler(int signal_number) {
213 static void parse_arguments(int argc, char **argv) {
216 /* Default values. */
219 while (-1 != (option = getopt(argc, argv, "p:t:h?"))) {
224 /* -p must have the format host:port. */
225 if (NULL == (position = strchr(optarg, ':'))
226 || position == optarg
227 || 0 == strlen(position + 1)
228 || 0 >= atoi(position + 1)
229 || 0xffff < atoi(position + 1)) {
230 print_usage(argv[0]);
231 fprintf(stderr, "\ninvalid -p, format host:port\n");
235 use_proxy_host = malloc((size_t)(position - optarg) + 1);
236 if (NULL == use_proxy_host) {
240 memcpy(use_proxy_host, optarg, (size_t)(position - optarg));
241 use_proxy_host[position - optarg] = '\0';
243 use_proxy_port = malloc(strlen(position + 1) + 1);
244 if (NULL == use_proxy_port) {
248 strcpy(use_proxy_port, position + 1);
253 if (0 >= atoi(optarg)) {
254 print_usage(argv[0]);
255 fprintf(stderr, "\n-t positive number required\n");
258 thread_count = (size_t)atoi(optarg);
263 print_usage(argv[0]);
268 if (optind >= argc) {
269 print_usage(argv[0]);
270 fprintf(stderr, "\nport missing\n");
274 static void print_usage(const char *argv) {
275 fprintf(stderr, "Usage: %s [-p host:port] port\n", argv);
276 fprintf(stderr, "\n");
277 fprintf(stderr, "-p proxy hostname and port\n");
278 fprintf(stderr, "-t number of threads [default: 10]\n");
281 static void worker_thread(void) {
285 /* Get next element from ring buffer. */
288 client_socket = ringbuffer[ringbuffer_read];
289 ringbuffer_read = (ringbuffer_read + 1) % RINGBUFFER_SIZE;
293 /* Negative value indicates we should shut down our thread. */
294 if (client_socket < 0) {
298 handle_connection(client_socket);