src/lib/httpd.c

   1 /**
   2  *  Copyright (C) 2011-2012  Juho Vähä-Herttua
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2.1 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Lesser General Public License for more details.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <stdio.h>
  18 #include <assert.h>
  19
  20 #include "httpd.h"
  21 #include "netutils.h"
  22 #include "http_request.h"
  23 #include "compat.h"
  24 #include "logger.h"
  25
  26 struct http_connection_s {
  27         int connected;
  28
  29         int socket_fd;
  30         void *user_data;
  31         http_request_t *request;
  32 };
  33 typedef struct http_connection_s http_connection_t;
  34
  35 struct httpd_s {
  36         logger_t *logger;
  37         httpd_callbacks_t callbacks;
  38
  39         int max_connections;
  40         int open_connections;
  41         http_connection_t *connections;
  42
  43         /* These variables only edited mutex locked */
  44         int running;
  45         int joined;
  46         thread_handle_t thread;
  47         mutex_handle_t run_mutex;
  48
  49         /* Server fds for accepting connections */
  50         int server_fd4;
  51         int server_fd6;
  52 };
  53
  54 httpd_t *
  55 httpd_init(logger_t *logger, httpd_callbacks_t *callbacks, int max_connections)
  56 {
  57         httpd_t *httpd;
  58
  59         assert(logger);
  60         assert(callbacks);
  61         assert(max_connections > 0);
  62
  63         /* Allocate the httpd_t structure */
  64         httpd = calloc(1, sizeof(httpd_t));
  65         if (!httpd) {
  66                 return NULL;
  67         }
  68
  69         httpd->max_connections = max_connections;
  70         httpd->connections = calloc(max_connections, sizeof(http_connection_t));
  71         if (!httpd->connections) {
  72                 free(httpd);
  73                 return NULL;
  74         }
  75
  76         /* Use the logger provided */
  77         httpd->logger = logger;
  78
  79         /* Save callback pointers */
  80         memcpy(&httpd->callbacks, callbacks, sizeof(httpd_callbacks_t));
  81
  82         /* Initial status joined */
  83         httpd->running = 0;
  84         httpd->joined = 1;
  85
  86         return httpd;
  87 }
  88
  89 void
  90 httpd_destroy(httpd_t *httpd)
  91 {
  92         if (httpd) {
  93                 httpd_stop(httpd);
  94
  95                 free(httpd->connections);
  96                 free(httpd);
  97         }
  98 }
  99
 100 static void
 101 httpd_add_connection(httpd_t *httpd, int fd, unsigned char *local, int local_len, unsigned char *remote, int remote_len)
 102 {
 103         int i;
 104
 105         for (i=0; i<httpd->max_connections; i++) {
 106                 if (!httpd->connections[i].connected) {
 107                         break;
 108                 }
 109         }
 110         if (i == httpd->max_connections) {
 111                 /* This code should never be reached, we do not select server_fds when full */
 112                 logger_log(httpd->logger, LOGGER_INFO, "Max connections reached");
 113                 shutdown(fd, SHUT_RDWR);
 114                 closesocket(fd);
 115                 return;
 116         }
 117
 118         httpd->open_connections++;
 119         httpd->connections[i].socket_fd = fd;
 120         httpd->connections[i].connected = 1;
 121         httpd->connections[i].user_data = httpd->callbacks.conn_init(httpd->callbacks.opaque, local, local_len, remote, remote_len);
 122 }
 123
 124 static int
 125 httpd_accept_connection(httpd_t *httpd, int server_fd, int is_ipv6)
 126 {
 127         struct sockaddr_storage remote_saddr;
 128         socklen_t remote_saddrlen;
 129         struct sockaddr_storage local_saddr;
 130         socklen_t local_saddrlen;
 131         unsigned char *local, *remote;
 132         int local_len, remote_len;
 133         int ret, fd;
 134
 135         remote_saddrlen = sizeof(remote_saddr);
 136         fd = accept(server_fd, (struct sockaddr *)&remote_saddr, &remote_saddrlen);
 137         if (fd == -1) {
 138                 /* FIXME: Error happened */
 139                 return -1;
 140         }
 141
 142         local_saddrlen = sizeof(local_saddr);
 143         ret = getsockname(fd, (struct sockaddr *)&local_saddr, &local_saddrlen);
 144         if (ret == -1) {
 145                 closesocket(fd);
 146                 return 0;
 147         }
 148
 149         logger_log(httpd->logger, LOGGER_INFO, "Accepted %s client on socket %d",
 150                    (is_ipv6 ? "IPv6"  : "IPv4"), fd);
 151         local = netutils_get_address(&local_saddr, &local_len);
 152         remote = netutils_get_address(&remote_saddr, &remote_len);
 153
 154         httpd_add_connection(httpd, fd, local, local_len, remote, remote_len);
 155         return 1;
 156 }
 157
 158 static void
 159 httpd_remove_connection(httpd_t *httpd, http_connection_t *connection)
 160 {
 161         if (connection->request) {
 162                 http_request_destroy(connection->request);
 163                 connection->request = NULL;
 164         }
 165         httpd->callbacks.conn_destroy(connection->user_data);
 166         shutdown(connection->socket_fd, SHUT_WR);
 167         closesocket(connection->socket_fd);
 168         connection->connected = 0;
 169         httpd->open_connections--;
 170 }
 171
 172 static THREAD_RETVAL
 173 httpd_thread(void *arg)
 174 {
 175         httpd_t *httpd = arg;
 176         char buffer[1024];
 177         int i;
 178
 179         assert(httpd);
 180
 181         while (1) {
 182                 fd_set rfds;
 183                 struct timeval tv;
 184                 int nfds=0;
 185                 int ret;
 186
 187                 MUTEX_LOCK(httpd->run_mutex);
 188                 if (!httpd->running) {
 189                         MUTEX_UNLOCK(httpd->run_mutex);
 190                         break;
 191                 }
 192                 MUTEX_UNLOCK(httpd->run_mutex);
 193
 194                 /* Set timeout value to 5ms */
 195                 tv.tv_sec = 1;
 196                 tv.tv_usec = 5000;
 197
 198                 /* Get the correct nfds value and set rfds */
 199                 FD_ZERO(&rfds);
 200                 if (httpd->open_connections < httpd->max_connections) {
 201                         FD_SET(httpd->server_fd4, &rfds);
 202                         nfds = httpd->server_fd4+1;
 203                         if (httpd->server_fd6 != -1) {
 204                                 FD_SET(httpd->server_fd6, &rfds);
 205                                 if (nfds <= httpd->server_fd6) {
 206                                         nfds = httpd->server_fd6+1;
 207                                 }
 208                         }
 209                 }
 210                 for (i=0; i<httpd->max_connections; i++) {
 211                         int socket_fd;
 212                         if (!httpd->connections[i].connected) {
 213                                 continue;
 214                         }
 215                         socket_fd = httpd->connections[i].socket_fd;
 216                         FD_SET(socket_fd, &rfds);
 217                         if (nfds <= socket_fd) {
 218                                 nfds = socket_fd+1;
 219                         }
 220                 }
 221
 222                 ret = select(nfds, &rfds, NULL, NULL, &tv);
 223                 if (ret == 0) {
 224                         /* Timeout happened */
 225                         continue;
 226                 } else if (ret == -1) {
 227                         /* FIXME: Error happened */
 228                         logger_log(httpd->logger, LOGGER_INFO, "Error in select");
 229                         break;
 230                 }
 231
 232                 if (FD_ISSET(httpd->server_fd4, &rfds)) {
 233                         ret = httpd_accept_connection(httpd, httpd->server_fd4, 0);
 234                         if (ret == -1) {
 235                                 break;
 236                         } else if (ret == 0) {
 237                                 continue;
 238                         }
 239                 }
 240                 if (httpd->open_connections < httpd->max_connections &&
 241                     httpd->server_fd6 != -1 && FD_ISSET(httpd->server_fd6, &rfds)) {
 242                         ret = httpd_accept_connection(httpd, httpd->server_fd6, 1);
 243                         if (ret == -1) {
 244                                 break;
 245                         } else if (ret == 0) {
 246                                 continue;
 247                         }
 248                 }
 249                 for (i=0; i<httpd->max_connections; i++) {
 250                         http_connection_t *connection = &httpd->connections[i];
 251
 252                         if (!connection->connected) {
 253                                 continue;
 254                         }
 255                         if (!FD_ISSET(connection->socket_fd, &rfds)) {
 256                                 continue;
 257                         }
 258
 259                         /* If not in the middle of request, allocate one */
 260                         if (!connection->request) {
 261                                 connection->request = http_request_init();
 262                                 assert(connection->request);
 263                         }
 264
 265                         logger_log(httpd->logger, LOGGER_DEBUG, "Receiving on socket %d", connection->socket_fd);
 266                         ret = recv(connection->socket_fd, buffer, sizeof(buffer), 0);
 267                         if (ret == 0) {
 268                                 logger_log(httpd->logger, LOGGER_INFO, "Connection closed for socket %d", connection->socket_fd);
 269                                 httpd_remove_connection(httpd, connection);
 270                                 continue;
 271                         }
 272
 273                         /* Parse HTTP request from data read from connection */
 274                         http_request_add_data(connection->request, buffer, ret);
 275                         if (http_request_has_error(connection->request)) {
 276                                 logger_log(httpd->logger, LOGGER_INFO, "Error in parsing: %s", http_request_get_error_name(connection->request));
 277                                 httpd_remove_connection(httpd, connection);
 278                                 continue;
 279                         }
 280
 281                         /* If request is finished, process and deallocate */
 282                         if (http_request_is_complete(connection->request)) {
 283                                 http_response_t *response = NULL;
 284
 285                                 httpd->callbacks.conn_request(connection->user_data, connection->request, &response);
 286                                 http_request_destroy(connection->request);
 287                                 connection->request = NULL;
 288
 289                                 if (response) {
 290                                         const char *data;
 291                                         int datalen;
 292                                         int written;
 293                                         int ret;
 294
 295                                         /* Get response data and datalen */
 296                                         data = http_response_get_data(response, &datalen);
 297
 298                                         written = 0;
 299                                         while (written < datalen) {
 300                                                 ret = send(connection->socket_fd, data+written, datalen-written, 0);
 301                                                 if (ret == -1) {
 302                                                         /* FIXME: Error happened */
 303                                                         logger_log(httpd->logger, LOGGER_INFO, "Error in sending data");
 304                                                         break;
 305                                                 }
 306                                                 written += ret;
 307                                         }
 308
 309                                         if (http_response_get_disconnect(response)) {
 310                                                 logger_log(httpd->logger, LOGGER_INFO, "Disconnecting on software request");
 311                                                 httpd_remove_connection(httpd, connection);
 312                                         }
 313                                 } else {
 314                                         logger_log(httpd->logger, LOGGER_INFO, "Didn't get response");
 315                                 }
 316                                 http_response_destroy(response);
 317                         } else {
 318                                 logger_log(httpd->logger, LOGGER_DEBUG, "Request not complete, waiting for more data...");
 319                         }
 320                 }
 321         }
 322
 323         /* Remove all connections that are still connected */
 324         for (i=0; i<httpd->max_connections; i++) {
 325                 http_connection_t *connection = &httpd->connections[i];
 326
 327                 if (!connection->connected) {
 328                         continue;
 329                 }
 330                 logger_log(httpd->logger, LOGGER_INFO, "Removing connection for socket %d", connection->socket_fd);
 331                 httpd_remove_connection(httpd, connection);
 332         }
 333
 334         /* Close server sockets since they are not used any more */
 335         if (httpd->server_fd4 != -1) {
 336                 closesocket(httpd->server_fd4);
 337                 httpd->server_fd4 = -1;
 338         }
 339         if (httpd->server_fd6 != -1) {
 340                 closesocket(httpd->server_fd6);
 341                 httpd->server_fd6 = -1;
 342         }
 343
 344         logger_log(httpd->logger, LOGGER_INFO, "Exiting HTTP thread");
 345
 346         return 0;
 347 }
 348
 349 int
 350 httpd_start(httpd_t *httpd, unsigned short *port)
 351 {
 352         assert(httpd);
 353         assert(port);
 354
 355         MUTEX_LOCK(httpd->run_mutex);
 356         if (httpd->running || !httpd->joined) {
 357                 MUTEX_UNLOCK(httpd->run_mutex);
 358                 return 0;
 359         }
 360
 361         httpd->server_fd4 = netutils_init_socket(port, 0, 0);
 362         if (httpd->server_fd4 == -1) {
 363                 logger_log(httpd->logger, LOGGER_ERR, "Error initialising socket %d", SOCKET_GET_ERROR());
 364                 MUTEX_UNLOCK(httpd->run_mutex);
 365                 return -1;
 366         }
 367         httpd->server_fd6 = netutils_init_socket(port, 1, 0);
 368         if (httpd->server_fd6 == -1) {
 369                 logger_log(httpd->logger, LOGGER_WARNING, "Error initialising IPv6 socket %d", SOCKET_GET_ERROR());
 370                 logger_log(httpd->logger, LOGGER_WARNING, "Continuing without IPv6 support");
 371         }
 372
 373         if (listen(httpd->server_fd4, 5) == -1) {
 374                 logger_log(httpd->logger, LOGGER_ERR, "Error listening to IPv4 socket");
 375                 closesocket(httpd->server_fd4);
 376                 closesocket(httpd->server_fd6);
 377                 MUTEX_UNLOCK(httpd->run_mutex);
 378                 return -2;
 379         }
 380         if (httpd->server_fd6 != -1 && listen(httpd->server_fd6, 5) == -1) {
 381                 logger_log(httpd->logger, LOGGER_ERR, "Error listening to IPv6 socket");
 382                 closesocket(httpd->server_fd4);
 383                 closesocket(httpd->server_fd6);
 384                 MUTEX_UNLOCK(httpd->run_mutex);
 385                 return -2;
 386         }
 387         logger_log(httpd->logger, LOGGER_INFO, "Initialized server socket(s)");
 388
 389         /* Set values correctly and create new thread */
 390         httpd->running = 1;
 391         httpd->joined = 0;
 392         THREAD_CREATE(httpd->thread, httpd_thread, httpd);
 393         MUTEX_UNLOCK(httpd->run_mutex);
 394
 395         return 1;
 396 }
 397
 398 int
 399 httpd_is_running(httpd_t *httpd)
 400 {
 401         int running;
 402
 403         assert(httpd);
 404
 405         MUTEX_LOCK(httpd->run_mutex);
 406         running = httpd->running || !httpd->joined;
 407         MUTEX_UNLOCK(httpd->run_mutex);
 408
 409         return running;
 410 }
 411
 412 void
 413 httpd_stop(httpd_t *httpd)
 414 {
 415         assert(httpd);
 416
 417         MUTEX_LOCK(httpd->run_mutex);
 418         if (!httpd->running || httpd->joined) {
 419                 MUTEX_UNLOCK(httpd->run_mutex);
 420                 return;
 421         }
 422         httpd->running = 0;
 423         MUTEX_UNLOCK(httpd->run_mutex);
 424
 425         THREAD_JOIN(httpd->thread);
 426
 427         MUTEX_LOCK(httpd->run_mutex);
 428         httpd->joined = 1;
 429         MUTEX_UNLOCK(httpd->run_mutex);
 430 }
 431