src/core/sipe-http-transport.c

   1 /**
   2  * @file sipe-http-transport.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2013-2016 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  *
  24  * SIPE HTTP transport layer implementation
  25  *
  26  *  - connection handling: opening, closing, timeout
  27  *  - interface to backend: sending & receiving of raw messages
  28  *  - request queue pulling
  29  */
  30
  31 #include <string.h>
  32 #include <time.h>
  33
  34 #include <glib.h>
  35
  36 #include "sipmsg.h"
  37 #include "sipe-backend.h"
  38 #include "sipe-common.h"
  39 #include "sipe-core.h"
  40 #include "sipe-core-private.h"
  41 #include "sipe-http.h"
  42 #include "sipe-schedule.h"
  43 #include "sipe-utils.h"
  44
  45 #define _SIPE_HTTP_PRIVATE_IF_REQUEST
  46 #include "sipe-http-request.h"
  47 #define _SIPE_HTTP_PRIVATE_IF_TRANSPORT
  48 #include "sipe-http-transport.h"
  49
  50 #define SIPE_HTTP_CONNECTION         ((struct sipe_http_connection *) connection->user_data)
  51 #define SIPE_HTTP_CONNECTION_PRIVATE ((struct sipe_http_connection *) conn_public)
  52 #define SIPE_HTTP_CONNECTION_PUBLIC  ((struct sipe_http_connection_public *) conn)
  53
  54 #define SIPE_HTTP_TIMEOUT_ACTION  "<+http-timeout>"
  55 #define SIPE_HTTP_DEFAULT_TIMEOUT 60 /* in seconds */
  56
  57 struct sipe_http_connection {
  58         struct sipe_http_connection_public public;
  59
  60         struct sipe_transport_connection *connection;
  61
  62         gchar *host_port;
  63         time_t timeout;  /* in seconds from epoch */
  64         gboolean use_tls;
  65 };
  66
  67 struct sipe_http {
  68         GHashTable *connections;
  69         GQueue *timeouts;
  70         time_t next_timeout; /* in seconds from epoch, 0 if timer isn't running */
  71         gboolean shutting_down;
  72 };
  73
  74 static gint timeout_compare(gconstpointer a,
  75                             gconstpointer b,
  76                             SIPE_UNUSED_PARAMETER gpointer user_data)
  77 {
  78         return(((struct sipe_http_connection *) a)->timeout -
  79                ((struct sipe_http_connection *) b)->timeout);
  80 }
  81
  82 static void sipe_http_transport_update_timeout_queue(struct sipe_http_connection *conn,
  83                                                      gboolean remove);
  84 static void sipe_http_transport_free(gpointer data)
  85 {
  86         struct sipe_http_connection *conn = data;
  87
  88         SIPE_DEBUG_INFO("sipe_http_transport_free: destroying connection '%s'",
  89                         conn->host_port);
  90
  91         if (conn->connection)
  92                 sipe_backend_transport_disconnect(conn->connection);
  93         conn->connection = NULL;
  94
  95         sipe_http_transport_update_timeout_queue(conn, TRUE);
  96
  97         sipe_http_request_shutdown(SIPE_HTTP_CONNECTION_PUBLIC,
  98                                    conn->public.sipe_private->http->shutting_down);
  99
 100         g_free(conn->public.host);
 101
 102         g_free(conn->host_port);
 103         g_free(conn);
 104 }
 105
 106 static void sipe_http_transport_drop(struct sipe_http *http,
 107                                      struct sipe_http_connection *conn,
 108                                      const gchar *message)
 109 {
 110         SIPE_LOG_INFO("sipe_http_transport_drop: dropping connection '%s': %s",
 111                       conn->host_port,
 112                       message ? message : "REASON UNKNOWN");
 113
 114 #if GLIB_CHECK_VERSION(2,30,0)
 115         /* this triggers sipe_http_transport_free() */
 116         g_hash_table_remove(http->connections, conn->host_port);
 117 #else
 118         /* GLIB < 2.30 calls destroy notifiers *before* removing the entry */
 119         /* which can cause a race condition with sipe_http_transport_new() */
 120         g_hash_table_steal(http->connections, conn->host_port);
 121         sipe_http_transport_free(conn);
 122 #endif
 123         /* conn is no longer valid */
 124 }
 125
 126 static void start_timer(struct sipe_core_private *sipe_private,
 127                         time_t current_time);
 128 static void sipe_http_transport_timeout(struct sipe_core_private *sipe_private,
 129                                         gpointer data)
 130 {
 131         struct sipe_http *http = sipe_private->http;
 132         struct sipe_http_connection *conn = data;
 133         time_t current_time = time(NULL);
 134
 135         /* timer has expired */
 136         http->next_timeout = 0;
 137
 138         while (1) {
 139                 sipe_http_transport_drop(http, conn, "timeout");
 140                 /* conn is no longer valid */
 141
 142                 /* is there another active connection? */
 143                 conn = g_queue_peek_head(http->timeouts);
 144                 if (!conn)
 145                         break;
 146
 147                 /* restart timer for next connection */
 148                 if (conn->timeout > current_time) {
 149                         start_timer(sipe_private, current_time);
 150                         break;
 151                 }
 152
 153                 /* next connection timed-out too, loop around */
 154         }
 155 }
 156
 157 static void start_timer(struct sipe_core_private *sipe_private,
 158                         time_t current_time)
 159 {
 160         struct sipe_http *http = sipe_private->http;
 161         struct sipe_http_connection *conn = g_queue_peek_head(http->timeouts);
 162
 163         http->next_timeout = conn->timeout;
 164         sipe_schedule_seconds(sipe_private,
 165                               SIPE_HTTP_TIMEOUT_ACTION,
 166                               conn,
 167                               http->next_timeout - current_time,
 168                               sipe_http_transport_timeout,
 169                               NULL);
 170 }
 171
 172 static void sipe_http_transport_update_timeout_queue(struct sipe_http_connection *conn,
 173                                                      gboolean remove)
 174 {
 175         struct sipe_core_private *sipe_private = conn->public.sipe_private;
 176         struct sipe_http *http = sipe_private->http;
 177         GQueue *timeouts = http->timeouts;
 178         time_t current_time = time(NULL);
 179
 180         /* is this connection at head of queue? */
 181         gboolean update = (conn == g_queue_peek_head(timeouts));
 182
 183         /* update timeout queue */
 184         if (remove) {
 185                 g_queue_remove(timeouts, conn);
 186         } else {
 187                 conn->timeout = current_time + SIPE_HTTP_DEFAULT_TIMEOUT;
 188                 g_queue_sort(timeouts,
 189                              timeout_compare,
 190                              NULL);
 191         }
 192
 193         /* update timer if necessary */
 194         if (update) {
 195                 sipe_schedule_cancel(sipe_private, SIPE_HTTP_TIMEOUT_ACTION);
 196                 if (g_queue_is_empty(timeouts)) {
 197                         http->next_timeout = 0;
 198                 } else {
 199                         start_timer(sipe_private, current_time);
 200                 }
 201         }
 202 }
 203
 204 gboolean sipe_http_shutting_down(struct sipe_core_private *sipe_private)
 205 {
 206         struct sipe_http *http = sipe_private->http;
 207         /* We need to return FALSE in case HTTP stack isn't initialized yet */
 208         if (!http)
 209                 return(FALSE);
 210         return(http->shutting_down);
 211 }
 212
 213 void sipe_http_free(struct sipe_core_private *sipe_private)
 214 {
 215         struct sipe_http *http = sipe_private->http;
 216         if (!http)
 217                 return;
 218
 219         /* HTTP stack is shutting down: reject all new requests */
 220         http->shutting_down = TRUE;
 221
 222         sipe_schedule_cancel(sipe_private, SIPE_HTTP_TIMEOUT_ACTION);
 223         g_hash_table_destroy(http->connections);
 224         g_queue_free(http->timeouts);
 225         g_free(http);
 226         sipe_private->http = NULL;
 227 }
 228
 229 static void sipe_http_init(struct sipe_core_private *sipe_private)
 230 {
 231         struct sipe_http *http;
 232         if (sipe_private->http)
 233                 return;
 234
 235         sipe_private->http = http = g_new0(struct sipe_http, 1);
 236         http->connections = g_hash_table_new_full(g_str_hash, g_str_equal,
 237                                                   NULL,
 238                                                   sipe_http_transport_free);
 239         http->timeouts = g_queue_new();
 240 }
 241
 242 static void sipe_http_transport_connected(struct sipe_transport_connection *connection)
 243 {
 244         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 245         struct sipe_core_private *sipe_private = conn->public.sipe_private;
 246         struct sipe_http *http = sipe_private->http;
 247         time_t current_time = time(NULL);
 248
 249         SIPE_LOG_INFO("sipe_http_transport_connected: %s", conn->host_port);
 250         conn->public.connected = TRUE;
 251
 252         /* add active connection to timeout queue */
 253         conn->timeout = current_time + SIPE_HTTP_DEFAULT_TIMEOUT;
 254         g_queue_insert_sorted(http->timeouts,
 255                               conn,
 256                               timeout_compare,
 257                               NULL);
 258
 259         /* start timeout timer if necessary */
 260         if (http->next_timeout == 0)
 261                 start_timer(sipe_private, current_time);
 262
 263         sipe_http_request_next(SIPE_HTTP_CONNECTION_PUBLIC);
 264 }
 265
 266 static void sipe_http_transport_input(struct sipe_transport_connection *connection)
 267 {
 268         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 269         char *current = connection->buffer;
 270
 271         /* according to the RFC remove CRLF at the beginning */
 272         while (*current == '\r' || *current == '\n') {
 273                 current++;
 274         }
 275         if (current != connection->buffer)
 276                 sipe_utils_shrink_buffer(connection, current);
 277
 278         if (conn->connection &&
 279             (current = strstr(connection->buffer, "\r\n\r\n")) != NULL) {
 280                 struct sipmsg *msg;
 281                 gboolean drop = FALSE;
 282                 gboolean next;
 283
 284                 current += 2;
 285                 current[0] = '\0';
 286                 msg = sipmsg_parse_header(connection->buffer);
 287                 if (!msg) {
 288                         /* restore header for next try */
 289                         current[0] = '\r';
 290                         return;
 291                 }
 292
 293                 /* HTTP/1.1 Transfer-Encoding: chunked */
 294                 if (msg->bodylen == SIPMSG_BODYLEN_CHUNKED) {
 295                         gchar *start        = current + 2;
 296                         GSList *chunks      = NULL;
 297                         gboolean incomplete = TRUE;
 298
 299                         msg->bodylen = 0;
 300                         while (strlen(start) > 0) {
 301                                 gchar *tmp;
 302                                 guint length = g_ascii_strtoll(start, &tmp, 16);
 303                                 guint remainder;
 304                                 struct _chunk {
 305                                         guint length;
 306                                         const gchar *start;
 307                                 } *chunk;
 308
 309                                 /* Illegal number */
 310                                 if ((length == 0) && (start == tmp))
 311                                         break;
 312                                 msg->bodylen += length;
 313
 314                                 /* Chunk header not finished yet */
 315                                 tmp = strstr(tmp, "\r\n");
 316                                 if (tmp == NULL)
 317                                         break;
 318
 319                                 /* Chunk not finished yet */
 320                                 tmp += 2;
 321                                 remainder = connection->buffer_used - (tmp - connection->buffer);
 322                                 if (remainder < length + 2)
 323                                         break;
 324
 325                                 /* Next chunk */
 326                                 start = tmp + length + 2;
 327
 328                                 /* Body completed */
 329                                 if (length == 0) {
 330                                         gchar *dummy  = g_malloc(msg->bodylen + 1);
 331                                         gchar *p      = dummy;
 332                                         GSList *entry = chunks;
 333
 334                                         while (entry) {
 335                                                 chunk = entry->data;
 336                                                 memcpy(p, chunk->start, chunk->length);
 337                                                 p += chunk->length;
 338                                                 entry = entry->next;
 339                                         }
 340                                         p[0] = '\0';
 341
 342                                         msg->body = dummy;
 343                                         sipe_utils_message_debug("HTTP",
 344                                                                  connection->buffer,
 345                                                                  msg->body,
 346                                                                  FALSE);
 347
 348                                         current = start;
 349                                         sipe_utils_shrink_buffer(connection,
 350                                                                  current);
 351
 352                                         incomplete = FALSE;
 353                                         break;
 354                                 }
 355
 356                                 /* Append completed chunk */
 357                                 chunk = g_new0(struct _chunk, 1);
 358                                 chunk->length = length;
 359                                 chunk->start  = tmp;
 360                                 chunks = g_slist_append(chunks, chunk);
 361                         }
 362
 363                         if (chunks)
 364                                 sipe_utils_slist_free_full(chunks, g_free);
 365
 366                         if (incomplete) {
 367                                 /* restore header for next try */
 368                                 sipmsg_free(msg);
 369                                 current[0] = '\r';
 370                                 return;
 371                         }
 372
 373                 } else {
 374                         guint remainder = connection->buffer_used - (current + 2 - connection->buffer);
 375
 376                         if (remainder >= (guint) msg->bodylen) {
 377                                 char *dummy = g_malloc(msg->bodylen + 1);
 378                                 current += 2;
 379                                 memcpy(dummy, current, msg->bodylen);
 380                                 dummy[msg->bodylen] = '\0';
 381                                 msg->body = dummy;
 382                                 current += msg->bodylen;
 383                                 sipe_utils_message_debug("HTTP",
 384                                                          connection->buffer,
 385                                                          msg->body,
 386                                                          FALSE);
 387                                 sipe_utils_shrink_buffer(connection, current);
 388                         } else {
 389                                 SIPE_DEBUG_INFO("sipe_http_transport_input: body too short (%d < %d, strlen %" G_GSIZE_FORMAT ") - ignoring message",
 390                                                 remainder, msg->bodylen, strlen(connection->buffer));
 391
 392                                 /* restore header for next try */
 393                                 sipmsg_free(msg);
 394                                 current[0] = '\r';
 395                                 return;
 396                         }
 397                 }
 398
 399                 if (msg->response == SIPMSG_RESPONSE_FATAL_ERROR) {
 400                         /* fatal header parse error */
 401                         msg->response = SIPE_HTTP_STATUS_SERVER_ERROR;
 402                         drop          = TRUE;
 403                 } else if (sipe_strcase_equal(sipmsg_find_header(msg, "Connection"), "close")) {
 404                         SIPE_DEBUG_INFO("sipe_http_transport_input: server requested close '%s'",
 405                                         conn->host_port);
 406                         drop          = TRUE;
 407                 }
 408
 409                 sipe_http_request_response(SIPE_HTTP_CONNECTION_PUBLIC, msg);
 410                 next = sipe_http_request_pending(SIPE_HTTP_CONNECTION_PUBLIC);
 411
 412                 if (drop) {
 413                         /* drop backend connection */
 414                         sipe_backend_transport_disconnect(conn->connection);
 415                         conn->connection       = NULL;
 416                         conn->public.connected = FALSE;
 417
 418                         /* if we have pending requests we need to trigger re-connect */
 419                         if (next)
 420                                 sipe_http_transport_new(conn->public.sipe_private,
 421                                                         conn->public.host,
 422                                                         conn->public.port,
 423                                                         conn->use_tls);
 424
 425                 } else if (next) {
 426                         /* trigger sending of next pending request */
 427                         sipe_http_request_next(SIPE_HTTP_CONNECTION_PUBLIC);
 428                 }
 429
 430                 sipmsg_free(msg);
 431         }
 432 }
 433
 434 static void sipe_http_transport_error(struct sipe_transport_connection *connection,
 435                                       const gchar *msg)
 436 {
 437         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 438         sipe_http_transport_drop(conn->public.sipe_private->http,
 439                                  conn,
 440                                  msg);
 441         /* conn is no longer valid */
 442 }
 443
 444 struct sipe_http_connection_public *sipe_http_transport_new(struct sipe_core_private *sipe_private,
 445                                                             const gchar *host_in,
 446                                                             const guint32 port,
 447                                                             gboolean use_tls)
 448 {
 449         struct sipe_http *http;
 450         struct sipe_http_connection *conn = NULL;
 451         /* host name matching should be case insensitive */
 452         gchar *host = g_ascii_strdown(host_in, -1);
 453         gchar *host_port = g_strdup_printf("%s:%" G_GUINT32_FORMAT, host, port);
 454
 455         sipe_http_init(sipe_private);
 456
 457         http = sipe_private->http;
 458         if (http->shutting_down) {
 459                 SIPE_DEBUG_ERROR("sipe_http_transport_new: new connection requested during shutdown: THIS SHOULD NOT HAPPEN! Debugging information:\n"
 460                                  "Host/Port: %s", host_port);
 461         } else {
 462                 conn = g_hash_table_lookup(http->connections, host_port);
 463
 464                 if (conn) {
 465                         /* re-establishing connection */
 466                         if (!conn->connection) {
 467                                 SIPE_DEBUG_INFO("sipe_http_transport_new: re-establishing %s", host_port);
 468
 469                                 /* will be re-inserted after connect */
 470                                 sipe_http_transport_update_timeout_queue(conn, TRUE);
 471                         }
 472
 473                 } else {
 474                         /* new connection */
 475                         SIPE_DEBUG_INFO("sipe_http_transport_new: new %s", host_port);
 476
 477                         conn = g_new0(struct sipe_http_connection, 1);
 478
 479                         conn->public.sipe_private = sipe_private;
 480                         conn->public.host         = g_strdup(host);
 481                         conn->public.port         = port;
 482
 483                         conn->host_port           = host_port;
 484                         conn->use_tls             = use_tls;
 485
 486                         g_hash_table_insert(http->connections,
 487                                             host_port,
 488                                             conn);
 489                         host_port = NULL; /* conn_private takes ownership of the key */
 490                 }
 491
 492                 if (!conn->connection) {
 493                         sipe_connect_setup setup = {
 494                                 use_tls ? SIPE_TRANSPORT_TLS : SIPE_TRANSPORT_TCP,
 495                                 host,
 496                                 port,
 497                                 conn,
 498                                 sipe_http_transport_connected,
 499                                 sipe_http_transport_input,
 500                                 sipe_http_transport_error
 501                         };
 502
 503                         conn->public.connected = FALSE;
 504                         conn->connection = sipe_backend_transport_connect(SIPE_CORE_PUBLIC,
 505                                                                           &setup);
 506                 }
 507         }
 508
 509         g_free(host_port);
 510         g_free(host);
 511         return(SIPE_HTTP_CONNECTION_PUBLIC);
 512 }
 513
 514 void sipe_http_transport_send(struct sipe_http_connection_public *conn_public,
 515                               const gchar *header,
 516                               const gchar *body)
 517 {
 518         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION_PRIVATE;
 519         GString *message = g_string_new(header);
 520
 521         g_string_append_printf(message, "\r\n%s", body ? body : "");
 522
 523         sipe_utils_message_debug("HTTP", message->str, NULL, TRUE);
 524         sipe_backend_transport_message(conn->connection, message->str);
 525         g_string_free(message, TRUE);
 526
 527         sipe_http_transport_update_timeout_queue(conn, FALSE);
 528 }
 529
 530 /*
 531   Local Variables:
 532   mode: c
 533   c-file-style: "bsd"
 534   indent-tabs-mode: t
 535   tab-width: 8
 536   End:
 537 */