gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  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.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <sys/socket.h>
  33 #include <arpa/inet.h>
  34 #include <netdb.h>
  35
  36 #include "giognutls.h"
  37 #include "gresolv.h"
  38 #include "gweb.h"
  39
  40 #define DEFAULT_BUFFER_SIZE  2048
  41
  42 #define SESSION_FLAG_USE_TLS    (1 << 0)
  43
  44 enum chunk_state {
  45         CHUNK_SIZE,
  46         CHUNK_R_BODY,
  47         CHUNK_N_BODY,
  48         CHUNK_DATA,
  49 };
  50
  51 struct _GWebResult {
  52         guint16 status;
  53         const guint8 *buffer;
  54         gsize length;
  55         gboolean use_chunk;
  56         gchar *last_key;
  57         GHashTable *headers;
  58 };
  59
  60 struct web_session {
  61         GWeb *web;
  62
  63         char *address;
  64         char *host;
  65         uint16_t port;
  66         unsigned long flags;
  67         struct addrinfo *addr;
  68
  69         char *content_type;
  70
  71         GIOChannel *transport_channel;
  72         guint transport_watch;
  73         guint send_watch;
  74
  75         guint resolv_action;
  76         char *request;
  77
  78         guint8 *receive_buffer;
  79         gsize receive_space;
  80         GString *send_buffer;
  81         GString *current_header;
  82         gboolean header_done;
  83         gboolean body_done;
  84         gboolean more_data;
  85         gboolean request_started;
  86
  87         enum chunk_state chunck_state;
  88         gsize chunk_size;
  89         gsize chunk_left;
  90         gsize total_len;
  91
  92         GWebResult result;
  93
  94         GWebResultFunc result_func;
  95         GWebInputFunc input_func;
  96         gpointer user_data;
  97 };
  98
  99 struct _GWeb {
 100         gint ref_count;
 101
 102         guint next_query_id;
 103
 104         int family;
 105
 106         int index;
 107         GList *session_list;
 108
 109         GResolv *resolv;
 110         char *proxy;
 111         char *accept_option;
 112         char *user_agent;
 113         char *user_agent_profile;
 114         char *http_version;
 115         gboolean close_connection;
 116
 117         GWebDebugFunc debug_func;
 118         gpointer debug_data;
 119 };
 120
 121 static inline void debug(GWeb *web, const char *format, ...)
 122 {
 123         char str[256];
 124         va_list ap;
 125
 126         if (web->debug_func == NULL)
 127                 return;
 128
 129         va_start(ap, format);
 130
 131         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 132                 web->debug_func(str, web->debug_data);
 133
 134         va_end(ap);
 135 }
 136
 137 static void free_session(struct web_session *session)
 138 {
 139         GWeb *web = session->web;
 140
 141         if (session == NULL)
 142                 return;
 143
 144         g_free(session->request);
 145
 146         if (session->resolv_action > 0)
 147                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 148
 149         if (session->transport_watch > 0)
 150                 g_source_remove(session->transport_watch);
 151
 152         if (session->send_watch > 0)
 153                 g_source_remove(session->send_watch);
 154
 155         if (session->transport_channel != NULL)
 156                 g_io_channel_unref(session->transport_channel);
 157
 158         g_free(session->result.last_key);
 159
 160         if (session->result.headers != NULL)
 161                 g_hash_table_destroy(session->result.headers);
 162
 163         if (session->send_buffer != NULL)
 164                 g_string_free(session->send_buffer, TRUE);
 165
 166         if (session->current_header != NULL)
 167                 g_string_free(session->current_header, TRUE);
 168
 169         g_free(session->receive_buffer);
 170
 171         g_free(session->content_type);
 172
 173         g_free(session->host);
 174         g_free(session->address);
 175         if (session->addr != NULL)
 176                 freeaddrinfo(session->addr);
 177
 178         g_free(session);
 179 }
 180
 181 static void flush_sessions(GWeb *web)
 182 {
 183         GList *list;
 184
 185         for (list = g_list_first(web->session_list);
 186                                         list; list = g_list_next(list))
 187                 free_session(list->data);
 188
 189         g_list_free(web->session_list);
 190         web->session_list = NULL;
 191 }
 192
 193 GWeb *g_web_new(int index)
 194 {
 195         GWeb *web;
 196
 197         if (index < 0)
 198                 return NULL;
 199
 200         web = g_try_new0(GWeb, 1);
 201         if (web == NULL)
 202                 return NULL;
 203
 204         web->ref_count = 1;
 205
 206         web->next_query_id = 1;
 207
 208         web->family = AF_UNSPEC;
 209
 210         web->index = index;
 211         web->session_list = NULL;
 212
 213         web->resolv = g_resolv_new(index);
 214         if (web->resolv == NULL) {
 215                 g_free(web);
 216                 return NULL;
 217         }
 218
 219         web->accept_option = g_strdup("*/*");
 220         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 221         web->close_connection = FALSE;
 222
 223         return web;
 224 }
 225
 226 GWeb *g_web_ref(GWeb *web)
 227 {
 228         if (web == NULL)
 229                 return NULL;
 230
 231         g_atomic_int_inc(&web->ref_count);
 232
 233         return web;
 234 }
 235
 236 void g_web_unref(GWeb *web)
 237 {
 238         if (web == NULL)
 239                 return;
 240
 241         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 242                 return;
 243
 244         flush_sessions(web);
 245
 246         g_resolv_unref(web->resolv);
 247
 248         g_free(web->proxy);
 249
 250         g_free(web->accept_option);
 251         g_free(web->user_agent);
 252         g_free(web->user_agent_profile);
 253         g_free(web->http_version);
 254
 255         g_free(web);
 256 }
 257
 258 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 259 {
 260         if (web == NULL)
 261                 return;
 262
 263         web->debug_func = func;
 264         web->debug_data = user_data;
 265
 266         g_resolv_set_debug(web->resolv, func, user_data);
 267 }
 268
 269 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 270 {
 271         if (web == NULL)
 272                 return FALSE;
 273
 274         g_free(web->proxy);
 275
 276         if (proxy == NULL) {
 277                 web->proxy = NULL;
 278                 debug(web, "clearing proxy");
 279         } else {
 280                 web->proxy = g_strdup(proxy);
 281                 debug(web, "setting proxy %s", web->proxy);
 282         }
 283
 284         return TRUE;
 285 }
 286
 287 gboolean g_web_set_address_family(GWeb *web, int family)
 288 {
 289         if (web == NULL)
 290                 return FALSE;
 291
 292         if (family != AF_UNSPEC && family != AF_INET && family != AF_INET6)
 293                 return FALSE;
 294
 295         web->family = family;
 296
 297         g_resolv_set_address_family(web->resolv, family);
 298
 299         return TRUE;
 300 }
 301
 302 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 303 {
 304         if (web == NULL)
 305                 return FALSE;
 306
 307         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 308
 309         return TRUE;
 310 }
 311
 312 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 313 {
 314         g_free(web->accept_option);
 315
 316         if (format == NULL) {
 317                 web->accept_option = NULL;
 318                 debug(web, "clearing accept option");
 319         } else {
 320                 web->accept_option = g_strdup_vprintf(format, args);
 321                 debug(web, "setting accept %s", web->accept_option);
 322         }
 323
 324         return TRUE;
 325 }
 326
 327 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 328 {
 329         va_list args;
 330         gboolean result;
 331
 332         if (web == NULL)
 333                 return FALSE;
 334
 335         va_start(args, format);
 336         result = set_accept_option(web, format, args);
 337         va_end(args);
 338
 339         return result;
 340 }
 341
 342 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 343 {
 344         g_free(web->user_agent);
 345
 346         if (format == NULL) {
 347                 web->user_agent = NULL;
 348                 debug(web, "clearing user agent");
 349         } else {
 350                 web->user_agent = g_strdup_vprintf(format, args);
 351                 debug(web, "setting user agent %s", web->user_agent);
 352         }
 353
 354         return TRUE;
 355 }
 356
 357 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 358 {
 359         va_list args;
 360         gboolean result;
 361
 362         if (web == NULL)
 363                 return FALSE;
 364
 365         va_start(args, format);
 366         result = set_user_agent(web, format, args);
 367         va_end(args);
 368
 369         return result;
 370 }
 371
 372 gboolean g_web_set_ua_profile(GWeb *web, const char *profile)
 373 {
 374         if (web == NULL)
 375                 return FALSE;
 376
 377         g_free(web->user_agent_profile);
 378
 379         web->user_agent_profile = g_strdup(profile);
 380         debug(web, "setting user agent profile %s", web->user_agent);
 381
 382         return TRUE;
 383 }
 384
 385 gboolean g_web_set_http_version(GWeb *web, const char *version)
 386 {
 387         if (web == NULL)
 388                 return FALSE;
 389
 390         g_free(web->http_version);
 391
 392         if (version == NULL) {
 393                 web->http_version = NULL;
 394                 debug(web, "clearing HTTP version");
 395         } else {
 396                 web->http_version = g_strdup(version);
 397                 debug(web, "setting HTTP version %s", web->http_version);
 398         }
 399
 400         return TRUE;
 401 }
 402
 403 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 404 {
 405         if (web == NULL)
 406                 return;
 407
 408         web->close_connection = enabled;
 409 }
 410
 411 gboolean g_web_get_close_connection(GWeb *web)
 412 {
 413         if (web == NULL)
 414                 return FALSE;
 415
 416         return web->close_connection;
 417 }
 418
 419 static inline void call_result_func(struct web_session *session, guint16 status)
 420 {
 421         gboolean result;
 422
 423         if (session->result_func == NULL)
 424                 return;
 425
 426         if (status != 0)
 427                 session->result.status = status;
 428
 429         result = session->result_func(&session->result, session->user_data);
 430
 431         debug(session->web, "[result function] %s",
 432                                         result == TRUE ? "continue" : "stop");
 433 }
 434
 435 static gboolean process_send_buffer(struct web_session *session)
 436 {
 437         GString *buf = session->send_buffer;
 438         gsize count, bytes_written;
 439         GIOStatus status;
 440
 441         count = buf->len;
 442
 443         if (count == 0) {
 444                 if (session->request_started == TRUE &&
 445                                         session->more_data == FALSE)
 446                         session->body_done = TRUE;
 447
 448                 return FALSE;
 449         }
 450
 451         status = g_io_channel_write_chars(session->transport_channel,
 452                                         buf->str, count, &bytes_written, NULL);
 453
 454         debug(session->web, "status %u bytes to write %zu bytes written %zu",
 455                                         status, count, bytes_written);
 456
 457         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 458                 return FALSE;
 459
 460         g_string_erase(buf, 0, bytes_written);
 461
 462         return TRUE;
 463 }
 464
 465 static void process_next_chunk(struct web_session *session)
 466 {
 467         GString *buf = session->send_buffer;
 468         const guint8 *body;
 469         gsize length;
 470
 471         if (session->input_func == NULL) {
 472                 session->more_data = FALSE;
 473                 return;
 474         }
 475
 476         session->more_data = session->input_func(&body, &length,
 477                                                 session->user_data);
 478
 479         if (length > 0) {
 480                 g_string_append_printf(buf, "%zx\r\n", length);
 481                 g_string_append_len(buf, (char *) body, length);
 482                 g_string_append(buf, "\r\n");
 483         }
 484
 485         if (session->more_data == FALSE)
 486                 g_string_append(buf, "0\r\n\r\n");
 487 }
 488
 489 static void start_request(struct web_session *session)
 490 {
 491         GString *buf = session->send_buffer;
 492         const char *version;
 493         const guint8 *body;
 494         gsize length;
 495
 496         debug(session->web, "request %s from %s",
 497                                         session->request, session->host);
 498
 499         g_string_truncate(buf, 0);
 500
 501         if (session->web->http_version == NULL)
 502                 version = "1.1";
 503         else
 504                 version = session->web->http_version;
 505
 506         if (session->content_type == NULL)
 507                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 508                                                 session->request, version);
 509         else
 510                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 511                                                 session->request, version);
 512
 513         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 514
 515         if (session->web->user_agent != NULL)
 516                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 517                                                 session->web->user_agent);
 518
 519         if (session->web->user_agent_profile != NULL) {
 520                 g_string_append_printf(buf, "x-wap-profile: %s\r\n",
 521                                        session->web->user_agent_profile);
 522         }
 523
 524         if (session->web->accept_option != NULL)
 525                 g_string_append_printf(buf, "Accept: %s\r\n",
 526                                                 session->web->accept_option);
 527
 528         if (session->content_type != NULL) {
 529                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 530                                                         session->content_type);
 531                 if (session->input_func == NULL) {
 532                         session->more_data = FALSE;
 533                         length = 0;
 534                 } else
 535                         session->more_data = session->input_func(&body, &length,
 536                                                         session->user_data);
 537                 if (session->more_data == FALSE)
 538                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 539                                                                         length);
 540                 else
 541                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 542         }
 543
 544         if (session->web->close_connection == TRUE)
 545                 g_string_append(buf, "Connection: close\r\n");
 546
 547         g_string_append(buf, "\r\n");
 548
 549         if (session->content_type != NULL && length > 0) {
 550                 if (session->more_data == TRUE) {
 551                         g_string_append_printf(buf, "%zx\r\n", length);
 552                         g_string_append_len(buf, (char *) body, length);
 553                         g_string_append(buf, "\r\n");
 554                 } else
 555                         g_string_append_len(buf, (char *) body, length);
 556         }
 557 }
 558
 559 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 560                                                 gpointer user_data)
 561 {
 562         struct web_session *session = user_data;
 563
 564         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 565                 session->send_watch = 0;
 566                 return FALSE;
 567         }
 568
 569         if (process_send_buffer(session) == TRUE)
 570                 return TRUE;
 571
 572         if (session->request_started == FALSE) {
 573                 session->request_started = TRUE;
 574                 start_request(session);
 575         } else if (session->more_data == TRUE)
 576                 process_next_chunk(session);
 577
 578         process_send_buffer(session);
 579
 580         if (session->body_done == TRUE) {
 581                 session->send_watch = 0;
 582                 return FALSE;
 583         }
 584
 585         return TRUE;
 586 }
 587
 588 static int decode_chunked(struct web_session *session,
 589                                         const guint8 *buf, gsize len)
 590 {
 591         const guint8 *ptr = buf;
 592         gsize counter;
 593
 594         while (len > 0) {
 595                 guint8 *pos;
 596                 gsize count;
 597                 char *str;
 598
 599                 switch (session->chunck_state) {
 600                 case CHUNK_SIZE:
 601                         pos = memchr(ptr, '\n', len);
 602                         if (pos == NULL) {
 603                                 g_string_append_len(session->current_header,
 604                                                 (gchar *) ptr, len);
 605                                 return 0;
 606                         }
 607
 608                         count = pos - ptr;
 609                         if (count < 1 || ptr[count - 1] != '\r')
 610                                 return -EILSEQ;
 611
 612                         g_string_append_len(session->current_header,
 613                                                 (gchar *) ptr, count);
 614
 615                         len -= count + 1;
 616                         ptr = pos + 1;
 617
 618                         str = session->current_header->str;
 619
 620                         counter = strtoul(str, NULL, 16);
 621                         if ((counter == 0 && errno == EINVAL) ||
 622                                                 counter == ULONG_MAX)
 623                                 return -EILSEQ;
 624
 625                         session->chunk_size = counter;
 626                         session->chunk_left = counter;
 627
 628                         session->chunck_state = CHUNK_DATA;
 629                         break;
 630                 case CHUNK_R_BODY:
 631                         if (*ptr != '\r')
 632                                 return -EILSEQ;
 633                         ptr++;
 634                         len--;
 635                         session->chunck_state = CHUNK_N_BODY;
 636                         break;
 637                 case CHUNK_N_BODY:
 638                         if (*ptr != '\n')
 639                                 return -EILSEQ;
 640                         ptr++;
 641                         len--;
 642                         session->chunck_state = CHUNK_SIZE;
 643                         break;
 644                 case CHUNK_DATA:
 645                         if (session->chunk_size == 0) {
 646                                 debug(session->web, "Download Done in chunk");
 647                                 g_string_truncate(session->current_header, 0);
 648                                 return 0;
 649                         }
 650
 651                         if (session->chunk_left <= len) {
 652                                 session->result.buffer = ptr;
 653                                 session->result.length = session->chunk_left;
 654                                 call_result_func(session, 0);
 655
 656                                 len -= session->chunk_left;
 657                                 ptr += session->chunk_left;
 658
 659                                 session->total_len += session->chunk_left;
 660                                 session->chunk_left = 0;
 661
 662                                 g_string_truncate(session->current_header, 0);
 663                                 session->chunck_state = CHUNK_R_BODY;
 664                                 break;
 665                         }
 666                         /* more data */
 667                         session->result.buffer = ptr;
 668                         session->result.length = len;
 669                         call_result_func(session, 0);
 670
 671                         session->chunk_left -= len;
 672                         session->total_len += len;
 673
 674                         len -= len;
 675                         ptr += len;
 676                         break;
 677                 }
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int handle_body(struct web_session *session,
 684                                 const guint8 *buf, gsize len)
 685 {
 686         int err;
 687
 688         debug(session->web, "[body] length %zu", len);
 689
 690         if (session->result.use_chunk == FALSE) {
 691                 if (len > 0) {
 692                         session->result.buffer = buf;
 693                         session->result.length = len;
 694                         call_result_func(session, 0);
 695                 }
 696                 return 0;
 697         }
 698
 699         err = decode_chunked(session, buf, len);
 700         if (err < 0) {
 701                 debug(session->web, "Error in chunk decode %d", err);
 702
 703                 session->result.buffer = NULL;
 704                 session->result.length = 0;
 705                 call_result_func(session, 400);
 706         }
 707
 708         return err;
 709 }
 710
 711 static void handle_multi_line(struct web_session *session)
 712 {
 713         gsize count;
 714         char *str;
 715         gchar *value;
 716
 717         str = session->current_header->str;
 718
 719         if (str[0] != ' ' && str[0] != '\t')
 720                 return;
 721
 722         while (str[0] == ' ' || str[0] == '\t')
 723                 str++;
 724
 725         count = str - session->current_header->str;
 726         if (count > 0) {
 727                 g_string_erase(session->current_header, 0, count);
 728                 g_string_insert_c(session->current_header, 0, ' ');
 729         }
 730
 731         value = g_hash_table_lookup(session->result.headers,
 732                                         session->result.last_key);
 733         if (value != NULL) {
 734                 g_string_insert(session->current_header, 0, value);
 735
 736                 str = session->current_header->str;
 737
 738                 g_hash_table_replace(session->result.headers,
 739                                         g_strdup(session->result.last_key),
 740                                         g_strdup(str));
 741         }
 742 }
 743
 744 static void add_header_field(struct web_session *session)
 745 {
 746         gsize count;
 747         guint8 *pos;
 748         char *str;
 749         gchar *value;
 750         gchar *key;
 751
 752         str = session->current_header->str;
 753
 754         pos = memchr(str, ':', session->current_header->len);
 755         if (pos != NULL) {
 756                 *pos = '\0';
 757                 pos++;
 758
 759                 key = g_strdup(str);
 760
 761                 /* remove preceding white spaces */
 762                 while (*pos == ' ')
 763                         pos++;
 764
 765                 count = (char *) pos - str;
 766
 767                 g_string_erase(session->current_header, 0, count);
 768
 769                 value = g_hash_table_lookup(session->result.headers, key);
 770                 if (value != NULL) {
 771                         g_string_insert_c(session->current_header, 0, ' ');
 772                         g_string_insert_c(session->current_header, 0, ';');
 773
 774                         g_string_insert(session->current_header, 0, value);
 775                 }
 776
 777                 str = session->current_header->str;
 778                 g_hash_table_replace(session->result.headers, key,
 779                                                         g_strdup(str));
 780
 781                 g_free(session->result.last_key);
 782                 session->result.last_key = g_strdup(key);
 783         }
 784 }
 785
 786 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 787                                                         gpointer user_data)
 788 {
 789         struct web_session *session = user_data;
 790         guint8 *ptr = session->receive_buffer;
 791         gsize bytes_read;
 792         GIOStatus status;
 793
 794         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 795                 session->transport_watch = 0;
 796                 session->result.buffer = NULL;
 797                 session->result.length = 0;
 798                 call_result_func(session, 400);
 799                 return FALSE;
 800         }
 801
 802         status = g_io_channel_read_chars(channel,
 803                                 (gchar *) session->receive_buffer,
 804                                 session->receive_space - 1, &bytes_read, NULL);
 805
 806         debug(session->web, "bytes read %zu", bytes_read);
 807
 808         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 809                 session->transport_watch = 0;
 810                 session->result.buffer = NULL;
 811                 session->result.length = 0;
 812                 call_result_func(session, 0);
 813                 return FALSE;
 814         }
 815
 816         session->receive_buffer[bytes_read] = '\0';
 817
 818         if (session->header_done == TRUE) {
 819                 if (handle_body(session, session->receive_buffer,
 820                                                         bytes_read) < 0) {
 821                         session->transport_watch = 0;
 822                         return FALSE;
 823                 }
 824                 return TRUE;
 825         }
 826
 827         while (bytes_read > 0) {
 828                 guint8 *pos;
 829                 gsize count;
 830                 char *str;
 831
 832                 pos = memchr(ptr, '\n', bytes_read);
 833                 if (pos == NULL) {
 834                         g_string_append_len(session->current_header,
 835                                                 (gchar *) ptr, bytes_read);
 836                         return TRUE;
 837                 }
 838
 839                 *pos = '\0';
 840                 count = strlen((char *) ptr);
 841                 if (count > 0 && ptr[count - 1] == '\r') {
 842                         ptr[--count] = '\0';
 843                         bytes_read--;
 844                 }
 845
 846                 g_string_append_len(session->current_header,
 847                                                 (gchar *) ptr, count);
 848
 849                 bytes_read -= count + 1;
 850                 if (bytes_read > 0)
 851                         ptr = pos + 1;
 852                 else
 853                         ptr = NULL;
 854
 855                 if (session->current_header->len == 0) {
 856                         char *val;
 857
 858                         session->header_done = TRUE;
 859
 860                         val = g_hash_table_lookup(session->result.headers,
 861                                                         "Transfer-Encoding");
 862                         if (val != NULL) {
 863                                 val = g_strrstr(val, "chunked");
 864                                 if (val != NULL) {
 865                                         session->result.use_chunk = TRUE;
 866
 867                                         session->chunck_state = CHUNK_SIZE;
 868                                         session->chunk_left = 0;
 869                                         session->total_len = 0;
 870                                 }
 871                         }
 872
 873                         if (handle_body(session, ptr, bytes_read) < 0) {
 874                                 session->transport_watch = 0;
 875                                 return FALSE;
 876                         }
 877                         break;
 878                 }
 879
 880                 str = session->current_header->str;
 881
 882                 if (session->result.status == 0) {
 883                         unsigned int code;
 884
 885                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 886                                 session->result.status = code;
 887                 }
 888
 889                 debug(session->web, "[header] %s", str);
 890
 891                 /* handle multi-line header */
 892                 if (str[0] == ' ' || str[0] == '\t')
 893                         handle_multi_line(session);
 894                 else
 895                         add_header_field(session);
 896
 897                 g_string_truncate(session->current_header, 0);
 898         }
 899
 900         return TRUE;
 901 }
 902
 903 static int connect_session_transport(struct web_session *session)
 904 {
 905         GIOFlags flags;
 906         int sk;
 907
 908         sk = socket(session->addr->ai_family, SOCK_STREAM | SOCK_CLOEXEC,
 909                         IPPROTO_TCP);
 910         if (sk < 0)
 911                 return -EIO;
 912
 913         if (session->flags & SESSION_FLAG_USE_TLS) {
 914                 debug(session->web, "using TLS encryption");
 915                 session->transport_channel = g_io_channel_gnutls_new(sk);
 916         } else {
 917                 debug(session->web, "no encryption");
 918                 session->transport_channel = g_io_channel_unix_new(sk);
 919         }
 920
 921         if (session->transport_channel == NULL) {
 922                 close(sk);
 923                 return -ENOMEM;
 924         }
 925
 926         flags = g_io_channel_get_flags(session->transport_channel);
 927         g_io_channel_set_flags(session->transport_channel,
 928                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 929
 930         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 931         g_io_channel_set_buffered(session->transport_channel, FALSE);
 932
 933         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 934
 935         if (connect(sk, session->addr->ai_addr,
 936                         session->addr->ai_addrlen) < 0) {
 937                 if (errno != EINPROGRESS) {
 938                         close(sk);
 939                         return -EIO;
 940                 }
 941         }
 942
 943         session->transport_watch = g_io_add_watch(session->transport_channel,
 944                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 945                                                 received_data, session);
 946
 947         session->send_watch = g_io_add_watch(session->transport_channel,
 948                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 949                                                 send_data, session);
 950
 951         return 0;
 952 }
 953
 954 static int create_transport(struct web_session *session)
 955 {
 956         int err;
 957
 958         err = connect_session_transport(session);
 959         if (err < 0)
 960                 return err;
 961
 962         debug(session->web, "creating session %s:%u",
 963                                         session->address, session->port);
 964
 965         return 0;
 966 }
 967
 968 static int parse_url(struct web_session *session,
 969                                 const char *url, const char *proxy)
 970 {
 971         char *scheme, *host, *port, *path;
 972
 973         scheme = g_strdup(url);
 974         if (scheme == NULL)
 975                 return -EINVAL;
 976
 977         host = strstr(scheme, "://");
 978         if (host != NULL) {
 979                 *host = '\0';
 980                 host += 3;
 981
 982                 if (strcasecmp(scheme, "https") == 0) {
 983                         session->port = 443;
 984                         session->flags |= SESSION_FLAG_USE_TLS;
 985                 } else if (strcasecmp(scheme, "http") == 0) {
 986                         session->port = 80;
 987                 } else {
 988                         g_free(scheme);
 989                         return -EINVAL;
 990                 }
 991         } else {
 992                 host = scheme;
 993                 session->port = 80;
 994         }
 995
 996         path = strchr(host, '/');
 997         if (path != NULL)
 998                 *(path++) = '\0';
 999
1000         if (proxy == NULL)
1001                 session->request = g_strdup_printf("/%s", path ? path : "");
1002         else
1003                 session->request = g_strdup(url);
1004
1005         port = strrchr(host, ':');
1006         if (port != NULL) {
1007                 char *end;
1008                 int tmp = strtol(port + 1, &end, 10);
1009
1010                 if (*end == '\0') {
1011                         *port = '\0';
1012                         session->port = tmp;
1013                 }
1014
1015                 if (proxy == NULL)
1016                         session->host = g_strdup(host);
1017                 else
1018                         session->host = g_strdup_printf("%s:%u", host, tmp);
1019         } else
1020                 session->host = g_strdup(host);
1021
1022         g_free(scheme);
1023
1024         if (proxy == NULL)
1025                 return 0;
1026
1027         scheme = g_strdup(proxy);
1028         if (scheme == NULL)
1029                 return -EINVAL;
1030
1031         host = strstr(proxy, "://");
1032         if (host != NULL) {
1033                 *host = '\0';
1034                 host += 3;
1035
1036                 if (strcasecmp(scheme, "http") != 0) {
1037                         g_free(scheme);
1038                         return -EINVAL;
1039                 }
1040         } else
1041                 host = scheme;
1042
1043         path = strchr(host, '/');
1044         if (path != NULL)
1045                 *(path++) = '\0';
1046
1047         port = strrchr(host, ':');
1048         if (port != NULL) {
1049                 char *end;
1050                 int tmp = strtol(port + 1, &end, 10);
1051
1052                 if (*end == '\0') {
1053                         *port = '\0';
1054                         session->port = tmp;
1055                 }
1056         }
1057
1058         session->address = g_strdup(host);
1059
1060         g_free(scheme);
1061
1062         return 0;
1063 }
1064
1065 static void resolv_result(GResolvResultStatus status,
1066                                         char **results, gpointer user_data)
1067 {
1068         struct web_session *session = user_data;
1069         struct addrinfo hints;
1070         char *port;
1071         int ret;
1072
1073         if (results == NULL || results[0] == NULL) {
1074                 call_result_func(session, 404);
1075                 return;
1076         }
1077
1078         debug(session->web, "address %s", results[0]);
1079
1080         memset(&hints, 0, sizeof(struct addrinfo));
1081         hints.ai_flags = AI_NUMERICHOST;
1082         hints.ai_family = session->web->family;
1083
1084         if (session->addr != NULL) {
1085                 freeaddrinfo(session->addr);
1086                 session->addr = NULL;
1087         }
1088
1089         port = g_strdup_printf("%u", session->port);
1090         ret = getaddrinfo(results[0], port, &hints, &session->addr);
1091         g_free(port);
1092         if (ret != 0 || session->addr == NULL) {
1093                 call_result_func(session, 400);
1094                 return;
1095         }
1096
1097         session->address = g_strdup(results[0]);
1098
1099         if (create_transport(session) < 0) {
1100                 call_result_func(session, 409);
1101                 return;
1102         }
1103 }
1104
1105 static guint do_request(GWeb *web, const char *url,
1106                                 const char *type, GWebInputFunc input,
1107                                 GWebResultFunc func, gpointer user_data)
1108 {
1109         struct web_session *session;
1110
1111         if (web == NULL || url == NULL)
1112                 return 0;
1113
1114         debug(web, "request %s", url);
1115
1116         session = g_try_new0(struct web_session, 1);
1117         if (session == NULL)
1118                 return 0;
1119
1120         if (parse_url(session, url, web->proxy) < 0) {
1121                 free_session(session);
1122                 return 0;
1123         }
1124
1125         debug(web, "address %s", session->address);
1126         debug(web, "port %u", session->port);
1127         debug(web, "host %s", session->host);
1128         debug(web, "flags %lu", session->flags);
1129         debug(web, "request %s", session->request);
1130
1131         if (type != NULL) {
1132                 session->content_type = g_strdup(type);
1133
1134                 debug(web, "content-type %s", session->content_type);
1135         }
1136
1137         session->web = web;
1138
1139         session->result_func = func;
1140         session->input_func = input;
1141         session->user_data = user_data;
1142
1143         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1144         if (session->receive_buffer == NULL) {
1145                 free_session(session);
1146                 return 0;
1147         }
1148
1149         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1150                                                         g_free, g_free);
1151         if (session->result.headers == NULL) {
1152                 free_session(session);
1153                 return 0;
1154         }
1155
1156         session->receive_space = DEFAULT_BUFFER_SIZE;
1157         session->send_buffer = g_string_sized_new(0);
1158         session->current_header = g_string_sized_new(0);
1159         session->header_done = FALSE;
1160         session->body_done = FALSE;
1161
1162         if (session->address == NULL && inet_aton(session->host, NULL) == 0) {
1163                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1164                                         session->host, resolv_result, session);
1165                 if (session->resolv_action == 0) {
1166                         free_session(session);
1167                         return 0;
1168                 }
1169         } else {
1170                 struct addrinfo hints;
1171                 char *port;
1172                 int ret;
1173
1174                 if (session->address == NULL)
1175                         session->address = g_strdup(session->host);
1176
1177                 memset(&hints, 0, sizeof(struct addrinfo));
1178                 hints.ai_flags = AI_NUMERICHOST;
1179                 hints.ai_family = session->web->family;
1180
1181                 if (session->addr != NULL) {
1182                         freeaddrinfo(session->addr);
1183                         session->addr = NULL;
1184                 }
1185
1186                 port = g_strdup_printf("%u", session->port);
1187                 ret = getaddrinfo(session->address, port, &hints,
1188                                                         &session->addr);
1189                 g_free(port);
1190                 if (ret != 0 || session->addr == NULL) {
1191                         free_session(session);
1192                         return 0;
1193                 }
1194
1195                 if (create_transport(session) < 0) {
1196                         free_session(session);
1197                         return 0;
1198                 }
1199         }
1200
1201         web->session_list = g_list_append(web->session_list, session);
1202
1203         return web->next_query_id++;
1204 }
1205
1206 guint g_web_request_get(GWeb *web, const char *url,
1207                                 GWebResultFunc func, gpointer user_data)
1208 {
1209         return do_request(web, url, NULL, NULL, func, user_data);
1210 }
1211
1212 guint g_web_request_post(GWeb *web, const char *url,
1213                                 const char *type, GWebInputFunc input,
1214                                 GWebResultFunc func, gpointer user_data)
1215 {
1216         return do_request(web, url, type, input, func, user_data);
1217 }
1218
1219 gboolean g_web_cancel_request(GWeb *web, guint id)
1220 {
1221         if (web == NULL)
1222                 return FALSE;
1223
1224         return TRUE;
1225 }
1226
1227 guint16 g_web_result_get_status(GWebResult *result)
1228 {
1229         if (result == NULL)
1230                 return 0;
1231
1232         return result->status;
1233 }
1234
1235 gboolean g_web_result_get_chunk(GWebResult *result,
1236                                 const guint8 **chunk, gsize *length)
1237 {
1238         if (result == NULL)
1239                 return FALSE;
1240
1241         if (chunk == NULL)
1242                 return FALSE;
1243
1244         *chunk = result->buffer;
1245
1246         if (length != NULL)
1247                 *length = result->length;
1248
1249         return TRUE;
1250 }
1251
1252 gboolean g_web_result_get_header(GWebResult *result,
1253                                 const char *header, const char **value)
1254 {
1255         if (result == NULL)
1256                 return FALSE;
1257
1258         if (value == NULL)
1259                 return FALSE;
1260
1261         *value = g_hash_table_lookup(result->headers, header);
1262
1263         if (*value == NULL)
1264                 return FALSE;
1265
1266         return TRUE;
1267 }
1268
1269 struct _GWebParser {
1270         gint ref_count;
1271         char *begin_token;
1272         char *end_token;
1273         const char *token_str;
1274         size_t token_len;
1275         size_t token_pos;
1276         gboolean intoken;
1277         GString *content;
1278         GWebParserFunc func;
1279         gpointer user_data;
1280 };
1281
1282 GWebParser *g_web_parser_new(const char *begin, const char *end,
1283                                 GWebParserFunc func, gpointer user_data)
1284 {
1285         GWebParser *parser;
1286
1287         parser = g_try_new0(GWebParser, 1);
1288         if (parser == NULL)
1289                 return NULL;
1290
1291         parser->ref_count = 1;
1292
1293         parser->begin_token = g_strdup(begin);
1294         parser->end_token = g_strdup(end);
1295
1296         if (parser->begin_token == NULL) {
1297                 g_free(parser);
1298                 return NULL;
1299         }
1300
1301         parser->func = func;
1302         parser->user_data = user_data;
1303
1304         parser->token_str = parser->begin_token;
1305         parser->token_len = strlen(parser->token_str);
1306         parser->token_pos = 0;
1307
1308         parser->intoken = FALSE;
1309         parser->content = g_string_sized_new(0);
1310
1311         return parser;
1312 }
1313
1314 GWebParser *g_web_parser_ref(GWebParser *parser)
1315 {
1316         if (parser == NULL)
1317                 return NULL;
1318
1319         g_atomic_int_inc(&parser->ref_count);
1320
1321         return parser;
1322 }
1323
1324 void g_web_parser_unref(GWebParser *parser)
1325 {
1326         if (parser == NULL)
1327                 return;
1328
1329         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1330                 return;
1331
1332         g_string_free(parser->content, TRUE);
1333
1334         g_free(parser->begin_token);
1335         g_free(parser->end_token);
1336         g_free(parser);
1337 }
1338
1339 void g_web_parser_feed_data(GWebParser *parser,
1340                                 const guint8 *data, gsize length)
1341 {
1342         const guint8 *ptr = data;
1343
1344         if (parser == NULL)
1345                 return;
1346
1347         while (length > 0) {
1348                 guint8 chr = parser->token_str[parser->token_pos];
1349
1350                 if (parser->token_pos == 0) {
1351                         guint8 *pos;
1352
1353                         pos = memchr(ptr, chr, length);
1354                         if (pos == NULL) {
1355                                 if (parser->intoken == TRUE)
1356                                         g_string_append_len(parser->content,
1357                                                         (gchar *) ptr, length);
1358                                 break;
1359                         }
1360
1361                         if (parser->intoken == TRUE)
1362                                 g_string_append_len(parser->content,
1363                                                 (gchar *) ptr, (pos - ptr) + 1);
1364
1365                         length -= (pos - ptr) + 1;
1366                         ptr = pos + 1;
1367
1368                         parser->token_pos++;
1369                         continue;
1370                 }
1371
1372                 if (parser->intoken == TRUE)
1373                         g_string_append_c(parser->content, ptr[0]);
1374
1375                 if (ptr[0] != chr) {
1376                         length--;
1377                         ptr++;
1378
1379                         parser->token_pos = 0;
1380                         continue;
1381                 }
1382
1383                 length--;
1384                 ptr++;
1385
1386                 parser->token_pos++;
1387
1388                 if (parser->token_pos == parser->token_len) {
1389                         if (parser->intoken == FALSE) {
1390                                 g_string_append(parser->content,
1391                                                         parser->token_str);
1392
1393                                 parser->intoken = TRUE;
1394                                 parser->token_str = parser->end_token;
1395                                 parser->token_len = strlen(parser->end_token);
1396                                 parser->token_pos = 0;
1397                         } else {
1398                                 char *str;
1399                                 str = g_string_free(parser->content, FALSE);
1400                                 parser->content = g_string_sized_new(0);
1401                                 if (parser->func)
1402                                         parser->func(str, parser->user_data);
1403                                 g_free(str);
1404
1405                                 parser->intoken = FALSE;
1406                                 parser->token_str = parser->begin_token;
1407                                 parser->token_len = strlen(parser->begin_token);
1408                                 parser->token_pos = 0;
1409                         }
1410                 }
1411         }
1412 }
1413
1414 void g_web_parser_end_data(GWebParser *parser)
1415 {
1416         if (parser == NULL)
1417                 return;
1418 }