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