src/core/sipe-http-transport.c

   1 /**
   2  * @file sipe-http-transport.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2013-2019 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'(%p)",
  89                         conn->host_port, conn->connection);
  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: '%s'(%p): %s",
 111                       conn->host_port,
 112                       conn->connection,
 113                       message ? message : "REASON UNKNOWN");
 114
 115 #if GLIB_CHECK_VERSION(2,30,0)
 116         /* this triggers sipe_http_transport_free() */
 117         g_hash_table_remove(http->connections, conn->host_port);
 118 #else
 119         /* GLIB < 2.30 calls destroy notifiers *before* removing the entry */
 120         /* which can cause a race condition with sipe_http_transport_new() */
 121         g_hash_table_steal(http->connections, conn->host_port);
 122         sipe_http_transport_free(conn);
 123 #endif
 124         /* conn is no longer valid */
 125 }
 126
 127 static void start_timer(struct sipe_core_private *sipe_private,
 128                         time_t current_time);
 129 static void sipe_http_transport_timeout(struct sipe_core_private *sipe_private,
 130                                         gpointer data)
 131 {
 132         struct sipe_http *http = sipe_private->http;
 133         struct sipe_http_connection *conn = data;
 134         time_t current_time = time(NULL);
 135
 136         /* timer has expired */
 137         http->next_timeout = 0;
 138
 139         while (1) {
 140                 sipe_http_transport_drop(http, conn, "timeout");
 141                 /* conn is no longer valid */
 142
 143                 /* is there another active connection? */
 144                 conn = g_queue_peek_head(http->timeouts);
 145                 if (!conn)
 146                         break;
 147
 148                 /* restart timer for next connection */
 149                 if (conn->timeout > current_time) {
 150                         start_timer(sipe_private, current_time);
 151                         break;
 152                 }
 153
 154                 /* next connection timed-out too, loop around */
 155         }
 156 }
 157
 158 static void start_timer(struct sipe_core_private *sipe_private,
 159                         time_t current_time)
 160 {
 161         struct sipe_http *http = sipe_private->http;
 162         struct sipe_http_connection *conn = g_queue_peek_head(http->timeouts);
 163
 164         http->next_timeout = conn->timeout;
 165         sipe_schedule_seconds(sipe_private,
 166                               SIPE_HTTP_TIMEOUT_ACTION,
 167                               conn,
 168                               http->next_timeout - current_time,
 169                               sipe_http_transport_timeout,
 170                               NULL);
 171 }
 172
 173 static void sipe_http_transport_update_timeout_queue(struct sipe_http_connection *conn,
 174                                                      gboolean remove)
 175 {
 176         struct sipe_core_private *sipe_private = conn->public.sipe_private;
 177         struct sipe_http *http = sipe_private->http;
 178         GQueue *timeouts = http->timeouts;
 179         time_t current_time = time(NULL);
 180
 181         /* is this connection at head of queue? */
 182         gboolean update = (conn == g_queue_peek_head(timeouts));
 183
 184         /* update timeout queue */
 185         if (remove) {
 186                 g_queue_remove(timeouts, conn);
 187         } else {
 188                 conn->timeout = current_time + SIPE_HTTP_DEFAULT_TIMEOUT;
 189                 g_queue_sort(timeouts,
 190                              timeout_compare,
 191                              NULL);
 192         }
 193
 194         /* update timer if necessary */
 195         if (update) {
 196                 sipe_schedule_cancel(sipe_private, SIPE_HTTP_TIMEOUT_ACTION);
 197                 if (g_queue_is_empty(timeouts)) {
 198                         http->next_timeout = 0;
 199                 } else {
 200                         start_timer(sipe_private, current_time);
 201                 }
 202         }
 203 }
 204
 205 gboolean sipe_http_shutting_down(struct sipe_core_private *sipe_private)
 206 {
 207         struct sipe_http *http = sipe_private->http;
 208         /* We need to return FALSE in case HTTP stack isn't initialized yet */
 209         if (!http)
 210                 return(FALSE);
 211         return(http->shutting_down);
 212 }
 213
 214 void sipe_http_free(struct sipe_core_private *sipe_private)
 215 {
 216         struct sipe_http *http = sipe_private->http;
 217         if (!http)
 218                 return;
 219
 220         /* HTTP stack is shutting down: reject all new requests */
 221         http->shutting_down = TRUE;
 222
 223         sipe_schedule_cancel(sipe_private, SIPE_HTTP_TIMEOUT_ACTION);
 224         g_hash_table_destroy(http->connections);
 225         g_queue_free(http->timeouts);
 226         g_free(http);
 227         sipe_private->http = NULL;
 228 }
 229
 230 static void sipe_http_init(struct sipe_core_private *sipe_private)
 231 {
 232         struct sipe_http *http;
 233         if (sipe_private->http)
 234                 return;
 235
 236         sipe_private->http = http = g_new0(struct sipe_http, 1);
 237         http->connections = g_hash_table_new_full(g_str_hash, g_str_equal,
 238                                                   NULL,
 239                                                   sipe_http_transport_free);
 240         http->timeouts = g_queue_new();
 241 }
 242
 243 static void sipe_http_transport_connected(struct sipe_transport_connection *connection)
 244 {
 245         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 246         struct sipe_core_private *sipe_private = conn->public.sipe_private;
 247         struct sipe_http *http = sipe_private->http;
 248         time_t current_time = time(NULL);
 249
 250         SIPE_LOG_INFO("sipe_http_transport_connected: '%s'(%p)",
 251                       conn->host_port, connection);
 252         conn->public.connected = TRUE;
 253
 254         /* add active connection to timeout queue */
 255         conn->timeout = current_time + SIPE_HTTP_DEFAULT_TIMEOUT;
 256         g_queue_insert_sorted(http->timeouts,
 257                               conn,
 258                               timeout_compare,
 259                               NULL);
 260
 261         /* start timeout timer if necessary */
 262         if (http->next_timeout == 0)
 263                 start_timer(sipe_private, current_time);
 264
 265         sipe_http_request_next(SIPE_HTTP_CONNECTION_PUBLIC);
 266 }
 267
 268 static void sipe_http_transport_input(struct sipe_transport_connection *connection)
 269 {
 270         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 271         char *current = connection->buffer;
 272
 273         /* according to the RFC remove CRLF at the beginning */
 274         while (*current == '\r' || *current == '\n') {
 275                 current++;
 276         }
 277         if (current != connection->buffer)
 278                 sipe_utils_shrink_buffer(connection, current);
 279
 280         if (conn->connection &&
 281             (current = strstr(connection->buffer, "\r\n\r\n")) != NULL) {
 282                 struct sipmsg *msg;
 283                 gboolean drop = FALSE;
 284                 gboolean next;
 285
 286                 current += 2;
 287                 current[0] = '\0';
 288                 msg = sipmsg_parse_header(connection->buffer);
 289                 if (!msg) {
 290                         /* restore header for next try */
 291                         current[0] = '\r';
 292                         return;
 293                 }
 294
 295                 /* HTTP/1.1 Transfer-Encoding: chunked */
 296                 if (msg->bodylen == SIPMSG_BODYLEN_CHUNKED) {
 297                         gchar *start        = current + 2;
 298                         GSList *chunks      = NULL;
 299                         gboolean incomplete = TRUE;
 300
 301                         msg->bodylen = 0;
 302                         while (strlen(start) > 0) {
 303                                 gchar *tmp;
 304                                 guint length = g_ascii_strtoll(start, &tmp, 16);
 305                                 guint remainder;
 306                                 struct _chunk {
 307                                         guint length;
 308                                         const gchar *start;
 309                                 } *chunk;
 310
 311                                 /* Illegal number */
 312                                 if ((length == 0) && (start == tmp))
 313                                         break;
 314                                 msg->bodylen += length;
 315
 316                                 /* Chunk header not finished yet */
 317                                 tmp = strstr(tmp, "\r\n");
 318                                 if (tmp == NULL)
 319                                         break;
 320
 321                                 /* Chunk not finished yet */
 322                                 tmp += 2;
 323                                 remainder = connection->buffer_used - (tmp - connection->buffer);
 324                                 if (remainder < length + 2)
 325                                         break;
 326
 327                                 /* Next chunk */
 328                                 start = tmp + length + 2;
 329
 330                                 /* Body completed */
 331                                 if (length == 0) {
 332                                         gchar *dummy  = g_malloc(msg->bodylen + 1);
 333                                         gchar *p      = dummy;
 334                                         GSList *entry = chunks;
 335
 336                                         while (entry) {
 337                                                 chunk = entry->data;
 338                                                 memcpy(p, chunk->start, chunk->length);
 339                                                 p += chunk->length;
 340                                                 entry = entry->next;
 341                                         }
 342                                         p[0] = '\0';
 343
 344                                         msg->body = dummy;
 345                                         sipe_utils_message_debug(connection,
 346                                                                  "HTTP",
 347                                                                  connection->buffer,
 348                                                                  msg->body,
 349                                                                  FALSE);
 350
 351                                         current = start;
 352                                         sipe_utils_shrink_buffer(connection,
 353                                                                  current);
 354
 355                                         incomplete = FALSE;
 356                                         break;
 357                                 }
 358
 359                                 /* Append completed chunk */
 360                                 chunk = g_new0(struct _chunk, 1);
 361                                 chunk->length = length;
 362                                 chunk->start  = tmp;
 363                                 chunks = g_slist_append(chunks, chunk);
 364                         }
 365
 366                         if (chunks)
 367                                 sipe_utils_slist_free_full(chunks, g_free);
 368
 369                         if (incomplete) {
 370                                 /* restore header for next try */
 371                                 sipmsg_free(msg);
 372                                 current[0] = '\r';
 373                                 return;
 374                         }
 375
 376                 } else {
 377                         guint remainder = connection->buffer_used - (current + 2 - connection->buffer);
 378
 379                         if (remainder >= (guint) msg->bodylen) {
 380                                 char *dummy = g_malloc(msg->bodylen + 1);
 381                                 current += 2;
 382                                 memcpy(dummy, current, msg->bodylen);
 383                                 dummy[msg->bodylen] = '\0';
 384                                 msg->body = dummy;
 385                                 current += msg->bodylen;
 386                                 sipe_utils_message_debug(connection,
 387                                                          "HTTP",
 388                                                          connection->buffer,
 389                                                          msg->body,
 390                                                          FALSE);
 391                                 sipe_utils_shrink_buffer(connection, current);
 392                         } else {
 393                                 SIPE_DEBUG_INFO("sipe_http_transport_input: body too short (%d < %d, strlen %" G_GSIZE_FORMAT ") - ignoring message",
 394                                                 remainder, msg->bodylen, strlen(connection->buffer));
 395
 396                                 /* restore header for next try */
 397                                 sipmsg_free(msg);
 398                                 current[0] = '\r';
 399                                 return;
 400                         }
 401                 }
 402
 403                 if (msg->response == SIPMSG_RESPONSE_FATAL_ERROR) {
 404                         /* fatal header parse error */
 405                         msg->response = SIPE_HTTP_STATUS_SERVER_ERROR;
 406                         drop          = TRUE;
 407                 } else if (sipe_strcase_equal(sipmsg_find_header(msg, "Connection"), "close")) {
 408                         SIPE_DEBUG_INFO("sipe_http_transport_input: server requested close '%s'",
 409                                         conn->host_port);
 410                         drop          = TRUE;
 411                 }
 412
 413                 sipe_http_request_response(SIPE_HTTP_CONNECTION_PUBLIC, msg);
 414                 next = sipe_http_request_pending(SIPE_HTTP_CONNECTION_PUBLIC);
 415
 416                 if (drop) {
 417                         /* drop backend connection */
 418                         sipe_backend_transport_disconnect(conn->connection);
 419                         conn->connection       = NULL;
 420                         conn->public.connected = FALSE;
 421
 422                         /* if we have pending requests we need to trigger re-connect */
 423                         if (next)
 424                                 sipe_http_transport_new(conn->public.sipe_private,
 425                                                         conn->public.host,
 426                                                         conn->public.port,
 427                                                         conn->use_tls);
 428
 429                 } else if (next) {
 430                         /* trigger sending of next pending request */
 431                         sipe_http_request_next(SIPE_HTTP_CONNECTION_PUBLIC);
 432                 }
 433
 434                 sipmsg_free(msg);
 435         }
 436 }
 437
 438 static void sipe_http_transport_error(struct sipe_transport_connection *connection,
 439                                       const gchar *msg)
 440 {
 441         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION;
 442         sipe_http_transport_drop(conn->public.sipe_private->http,
 443                                  conn,
 444                                  msg);
 445         /* conn is no longer valid */
 446 }
 447
 448 struct sipe_http_connection_public *sipe_http_transport_new(struct sipe_core_private *sipe_private,
 449                                                             const gchar *host_in,
 450                                                             const guint32 port,
 451                                                             gboolean use_tls)
 452 {
 453         struct sipe_http *http;
 454         struct sipe_http_connection *conn = NULL;
 455         /* host name matching should be case insensitive */
 456         gchar *host = g_ascii_strdown(host_in, -1);
 457         gchar *host_port = g_strdup_printf("%s:%" G_GUINT32_FORMAT, host, port);
 458
 459         sipe_http_init(sipe_private);
 460
 461         http = sipe_private->http;
 462         if (http->shutting_down) {
 463                 SIPE_DEBUG_ERROR("sipe_http_transport_new: new connection requested during shutdown: THIS SHOULD NOT HAPPEN! Debugging information:\n"
 464                                  "Host/Port: %s", host_port);
 465         } else {
 466                 conn = g_hash_table_lookup(http->connections, host_port);
 467
 468                 if (conn) {
 469                         /* re-establishing connection */
 470                         if (!conn->connection) {
 471                                 SIPE_DEBUG_INFO("sipe_http_transport_new: re-establishing %s", host_port);
 472
 473                                 /* will be re-inserted after connect */
 474                                 sipe_http_transport_update_timeout_queue(conn, TRUE);
 475                         }
 476
 477                 } else {
 478                         /* new connection */
 479                         SIPE_DEBUG_INFO("sipe_http_transport_new: new %s", host_port);
 480
 481                         conn = g_new0(struct sipe_http_connection, 1);
 482
 483                         conn->public.sipe_private = sipe_private;
 484                         conn->public.host         = g_strdup(host);
 485                         conn->public.port         = port;
 486
 487                         conn->host_port           = host_port;
 488                         conn->use_tls             = use_tls;
 489
 490                         g_hash_table_insert(http->connections,
 491                                             host_port,
 492                                             conn);
 493                         host_port = NULL; /* conn_private takes ownership of the key */
 494                 }
 495
 496                 if (!conn->connection) {
 497                         sipe_connect_setup setup = {
 498                                 use_tls ? SIPE_TRANSPORT_TLS : SIPE_TRANSPORT_TCP,
 499                                 host,
 500                                 port,
 501                                 conn,
 502                                 sipe_http_transport_connected,
 503                                 sipe_http_transport_input,
 504                                 sipe_http_transport_error
 505                         };
 506
 507                         conn->public.connected = FALSE;
 508                         conn->connection = sipe_backend_transport_connect(SIPE_CORE_PUBLIC,
 509                                                                           &setup);
 510                 }
 511         }
 512
 513         g_free(host_port);
 514         g_free(host);
 515         return(SIPE_HTTP_CONNECTION_PUBLIC);
 516 }
 517
 518 void sipe_http_transport_send(struct sipe_http_connection_public *conn_public,
 519                               const gchar *header,
 520                               const gchar *body)
 521 {
 522         struct sipe_http_connection *conn = SIPE_HTTP_CONNECTION_PRIVATE;
 523         GString *message = g_string_new(header);
 524
 525         g_string_append_printf(message, "\r\n%s", body ? body : "");
 526
 527         sipe_utils_message_debug(conn->connection, "HTTP", message->str, NULL, TRUE);
 528         sipe_backend_transport_message(conn->connection, message->str);
 529         g_string_free(message, TRUE);
 530
 531         sipe_http_transport_update_timeout_queue(conn, FALSE);
 532 }
 533
 534 /*
 535   Local Variables:
 536   mode: c
 537   c-file-style: "bsd"
 538   indent-tabs-mode: t
 539   tab-width: 8
 540   End:
 541 */