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