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 };
  56
  57 struct web_session {
  58         GWeb *web;
  59
  60         char *address;
  61         char *host;
  62         uint16_t port;
  63         unsigned long flags;
  64
  65         char *content_type;
  66
  67         GIOChannel *transport_channel;
  68         guint transport_watch;
  69         guint send_watch;
  70
  71         guint resolv_action;
  72         char *request;
  73
  74         guint8 *receive_buffer;
  75         gsize receive_space;
  76         GString *send_buffer;
  77         GString *current_header;
  78         gboolean header_done;
  79         gboolean body_done;
  80         gboolean more_data;
  81         gboolean request_started;
  82
  83         enum chunk_state chunck_state;
  84         gsize chunk_size;
  85         gsize chunk_left;
  86         gsize total_len;
  87
  88         GWebResult result;
  89
  90         GWebResultFunc result_func;
  91         GWebInputFunc input_func;
  92         gpointer user_data;
  93 };
  94
  95 struct _GWeb {
  96         gint ref_count;
  97
  98         guint next_query_id;
  99
 100         int index;
 101         GList *session_list;
 102
 103         GResolv *resolv;
 104         char *proxy;
 105         char *accept_option;
 106         char *user_agent;
 107         gboolean close_connection;
 108
 109         GWebDebugFunc debug_func;
 110         gpointer debug_data;
 111 };
 112
 113 static inline void debug(GWeb *web, const char *format, ...)
 114 {
 115         char str[256];
 116         va_list ap;
 117
 118         if (web->debug_func == NULL)
 119                 return;
 120
 121         va_start(ap, format);
 122
 123         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 124                 web->debug_func(str, web->debug_data);
 125
 126         va_end(ap);
 127 }
 128
 129 static void free_session(struct web_session *session)
 130 {
 131         GWeb *web = session->web;
 132
 133         if (session == NULL)
 134                 return;
 135
 136         g_free(session->request);
 137
 138         if (session->resolv_action > 0)
 139                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 140
 141         if (session->transport_watch > 0)
 142                 g_source_remove(session->transport_watch);
 143
 144         if (session->send_watch > 0)
 145                 g_source_remove(session->send_watch);
 146
 147         if (session->transport_channel != NULL)
 148                 g_io_channel_unref(session->transport_channel);
 149
 150         g_string_free(session->send_buffer, TRUE);
 151         g_string_free(session->current_header, TRUE);
 152         g_free(session->receive_buffer);
 153
 154         g_free(session->content_type);
 155
 156         g_free(session->host);
 157         g_free(session->address);
 158         g_free(session);
 159 }
 160
 161 static void flush_sessions(GWeb *web)
 162 {
 163         GList *list;
 164
 165         for (list = g_list_first(web->session_list);
 166                                         list; list = g_list_next(list))
 167                 free_session(list->data);
 168
 169         g_list_free(web->session_list);
 170         web->session_list = NULL;
 171 }
 172
 173 GWeb *g_web_new(int index)
 174 {
 175         GWeb *web;
 176
 177         if (index < 0)
 178                 return NULL;
 179
 180         web = g_try_new0(GWeb, 1);
 181         if (web == NULL)
 182                 return NULL;
 183
 184         web->ref_count = 1;
 185
 186         web->next_query_id = 1;
 187
 188         web->index = index;
 189         web->session_list = NULL;
 190
 191         web->resolv = g_resolv_new(index);
 192         if (web->resolv == NULL) {
 193                 g_free(web);
 194                 return NULL;
 195         }
 196
 197         web->accept_option = g_strdup("*/*");
 198         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 199         web->close_connection = FALSE;
 200
 201         return web;
 202 }
 203
 204 GWeb *g_web_ref(GWeb *web)
 205 {
 206         if (web == NULL)
 207                 return NULL;
 208
 209         g_atomic_int_inc(&web->ref_count);
 210
 211         return web;
 212 }
 213
 214 void g_web_unref(GWeb *web)
 215 {
 216         if (web == NULL)
 217                 return;
 218
 219         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 220                 return;
 221
 222         flush_sessions(web);
 223
 224         g_resolv_unref(web->resolv);
 225
 226         g_free(web->proxy);
 227
 228         g_free(web->accept_option);
 229         g_free(web->user_agent);
 230
 231         g_free(web);
 232 }
 233
 234 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 235 {
 236         if (web == NULL)
 237                 return;
 238
 239         web->debug_func = func;
 240         web->debug_data = user_data;
 241
 242         g_resolv_set_debug(web->resolv, func, user_data);
 243 }
 244
 245 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 246 {
 247         if (web == NULL)
 248                 return FALSE;
 249
 250         g_free(web->proxy);
 251         web->proxy = g_strdup(proxy);
 252
 253         return TRUE;
 254 }
 255
 256 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 257 {
 258         if (web == NULL)
 259                 return FALSE;
 260
 261         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 262
 263         return TRUE;
 264 }
 265
 266 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 267 {
 268         g_free(web->accept_option);
 269
 270         if (format == NULL) {
 271                 web->accept_option = NULL;
 272                 debug(web, "clearing accept option");
 273         } else {
 274                 web->accept_option = g_strdup_vprintf(format, args);
 275                 debug(web, "setting accept %s", web->accept_option);
 276         }
 277
 278         return TRUE;
 279 }
 280
 281 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 282 {
 283         va_list args;
 284         gboolean result;
 285
 286         if (web == NULL)
 287                 return FALSE;
 288
 289         va_start(args, format);
 290         result = set_accept_option(web, format, args);
 291         va_end(args);
 292
 293         return result;
 294 }
 295
 296 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 297 {
 298         g_free(web->user_agent);
 299
 300         if (format == NULL) {
 301                 web->user_agent = NULL;
 302                 debug(web, "clearing user agent");
 303         } else {
 304                 web->user_agent = g_strdup_vprintf(format, args);
 305                 debug(web, "setting user agent %s", web->user_agent);
 306         }
 307
 308         return TRUE;
 309 }
 310
 311 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 312 {
 313         va_list args;
 314         gboolean result;
 315
 316         if (web == NULL)
 317                 return FALSE;
 318
 319         va_start(args, format);
 320         result = set_user_agent(web, format, args);
 321         va_end(args);
 322
 323         return result;
 324 }
 325
 326 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 327 {
 328         if (web == NULL)
 329                 return;
 330
 331         web->close_connection = enabled;
 332 }
 333
 334 gboolean g_web_get_close_connection(GWeb *web)
 335 {
 336         if (web == NULL)
 337                 return FALSE;
 338
 339         return web->close_connection;
 340 }
 341
 342 static inline void call_result_func(struct web_session *session, guint16 status)
 343 {
 344         if (session->result_func == NULL)
 345                 return;
 346
 347         if (status != 0)
 348                 session->result.status = status;
 349
 350         session->result_func(&session->result, session->user_data);
 351 }
 352
 353 static gboolean process_send_buffer(struct web_session *session)
 354 {
 355         GString *buf = session->send_buffer;
 356         gsize count, bytes_written;
 357         GIOStatus status;
 358
 359         count = buf->len;
 360
 361         if (count == 0) {
 362                 if (session->more_data == FALSE)
 363                         session->body_done = TRUE;
 364
 365                 return FALSE;
 366         }
 367
 368         debug(session->web, "bytes to write %zu", count);
 369
 370         status = g_io_channel_write_chars(session->transport_channel,
 371                                         buf->str, count, &bytes_written, NULL);
 372
 373         debug(session->web, "status %u bytes written %zu",
 374                                         status, bytes_written);
 375
 376         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 377                 return FALSE;
 378
 379         g_string_erase(buf, 0, bytes_written);
 380
 381         return TRUE;
 382 }
 383
 384 static void process_next_chunk(struct web_session *session)
 385 {
 386         GString *buf = session->send_buffer;
 387         const guint8 *body;
 388         gsize length;
 389
 390         if (session->input_func == NULL) {
 391                 session->more_data = FALSE;
 392                 return;
 393         }
 394
 395         session->more_data = session->input_func(&body, &length,
 396                                                 session->user_data);
 397
 398         if (length > 0) {
 399                 g_string_append_printf(buf, "%zx\r\n", length);
 400                 g_string_append_len(buf, (char *) body, length);
 401                 g_string_append(buf, "\r\n");
 402         }
 403
 404         if (session->more_data == FALSE)
 405                 g_string_append(buf, "0\r\n\r\n");
 406 }
 407
 408 static void start_request(struct web_session *session)
 409 {
 410         GString *buf = session->send_buffer;
 411         const guint8 *body;
 412         gsize length;
 413
 414         debug(session->web, "request %s from %s",
 415                                         session->request, session->host);
 416
 417         g_string_truncate(buf, 0);
 418
 419         if (session->content_type == NULL)
 420                 g_string_append_printf(buf, "GET %s HTTP/1.1\r\n",
 421                                                         session->request);
 422         else
 423                 g_string_append_printf(buf, "POST %s HTTP/1.1\r\n",
 424                                                         session->request);
 425         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 426         if (session->web->user_agent != NULL)
 427                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 428                                                 session->web->user_agent);
 429         if (session->web->accept_option != NULL)
 430                 g_string_append_printf(buf, "Accept: %s\r\n",
 431                                                 session->web->accept_option);
 432         if (session->content_type != NULL) {
 433                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 434                                                         session->content_type);
 435                 if (session->input_func == NULL) {
 436                         session->more_data = FALSE;
 437                         length = 0;
 438                 } else
 439                         session->more_data = session->input_func(&body, &length,
 440                                                         session->user_data);
 441                 if (session->more_data == FALSE)
 442                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 443                                                                         length);
 444                 else
 445                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 446         }
 447         if (session->web->close_connection == TRUE)
 448                 g_string_append(buf, "Connection: close\r\n");
 449         g_string_append(buf, "\r\n");
 450
 451         if (session->content_type != NULL && length > 0) {
 452                 if (session->more_data == TRUE) {
 453                         g_string_append_printf(buf, "%zx\r\n", length);
 454                         g_string_append_len(buf, (char *) body, length);
 455                         g_string_append(buf, "\r\n");
 456                 } else
 457                         g_string_append_len(buf, (char *) body, length);
 458         }
 459 }
 460
 461 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 462                                                 gpointer user_data)
 463 {
 464         struct web_session *session = user_data;
 465
 466         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 467                 session->send_watch = 0;
 468                 return FALSE;
 469         }
 470
 471         if (process_send_buffer(session) == TRUE)
 472                 return TRUE;
 473
 474         if (session->request_started == FALSE) {
 475                 session->request_started = TRUE;
 476                 start_request(session);
 477         } else if (session->more_data == TRUE)
 478                 process_next_chunk(session);
 479
 480         process_send_buffer(session);
 481
 482         if (session->body_done == TRUE) {
 483                 session->send_watch = 0;
 484                 return FALSE;
 485         }
 486
 487         return TRUE;
 488 }
 489
 490 static int decode_chunked(struct web_session *session,
 491                                         const guint8 *buf, gsize len)
 492 {
 493         const guint8 *ptr = buf;
 494         gsize counter;
 495
 496         while (len > 0) {
 497                 guint8 *pos;
 498                 gsize count;
 499                 char *str;
 500
 501                 switch (session->chunck_state) {
 502                 case CHUNK_SIZE:
 503                         pos = memchr(ptr, '\n', len);
 504                         if (pos == NULL) {
 505                                 g_string_append_len(session->current_header,
 506                                                 (gchar *) ptr, len);
 507                                 return 0;
 508                         }
 509
 510                         count = pos - ptr;
 511                         if (count < 1 || ptr[count - 1] != '\r')
 512                                 return -EILSEQ;
 513
 514                         g_string_append_len(session->current_header,
 515                                                 (gchar *) ptr, count);
 516
 517                         len -= count + 1;
 518                         ptr = pos + 1;
 519
 520                         str = session->current_header->str;
 521
 522                         counter = strtoul(str, NULL, 16);
 523                         if ((counter == 0 && errno == EINVAL) ||
 524                                                 counter == ULONG_MAX)
 525                                 return -EILSEQ;
 526
 527                         session->chunk_size = counter;
 528                         session->chunk_left = counter;
 529
 530                         session->chunck_state = CHUNK_DATA;
 531                         break;
 532                 case CHUNK_R_BODY:
 533                         if (*ptr != '\r')
 534                                 return -EILSEQ;
 535                         ptr++;
 536                         len--;
 537                         session->chunck_state = CHUNK_N_BODY;
 538                         break;
 539                 case CHUNK_N_BODY:
 540                         if (*ptr != '\n')
 541                                 return -EILSEQ;
 542                         ptr++;
 543                         len--;
 544                         session->chunck_state = CHUNK_SIZE;
 545                         break;
 546                 case CHUNK_DATA:
 547                         if (session->chunk_size == 0) {
 548                                 debug(session->web, "Download Done in chunk");
 549                                 g_string_truncate(session->current_header, 0);
 550                                 return 0;
 551                         }
 552
 553                         if (session->chunk_left <= len) {
 554                                 session->result.buffer = ptr;
 555                                 session->result.length = session->chunk_left;
 556                                 call_result_func(session, 0);
 557
 558                                 len -= session->chunk_left;
 559                                 ptr += session->chunk_left;
 560
 561                                 session->total_len += session->chunk_left;
 562                                 session->chunk_left = 0;
 563
 564                                 g_string_truncate(session->current_header, 0);
 565                                 session->chunck_state = CHUNK_R_BODY;
 566                                 break;
 567                         }
 568                         /* more data */
 569                         session->result.buffer = ptr;
 570                         session->result.length = len;
 571                         call_result_func(session, 0);
 572
 573                         session->chunk_left -= len;
 574                         session->total_len += len;
 575
 576                         len -= len;
 577                         ptr += len;
 578                         break;
 579                 }
 580         }
 581
 582         return 0;
 583 }
 584
 585 static int handle_body(struct web_session *session,
 586                                 const guint8 *buf, gsize len)
 587 {
 588         int err;
 589
 590         debug(session->web, "[body] length %zu", len);
 591
 592         if (session->result.use_chunk == FALSE) {
 593                 session->result.buffer = buf;
 594                 session->result.length = len;
 595                 call_result_func(session, 0);
 596                 return 0;
 597         }
 598
 599         err = decode_chunked(session, buf, len);
 600         if (err < 0) {
 601                 debug(session->web, "Error in chunk decode %d", err);
 602
 603                 session->result.buffer = NULL;
 604                 session->result.length = 0;
 605                 call_result_func(session, 400);
 606         }
 607
 608         return err;
 609 }
 610
 611 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 612                                                         gpointer user_data)
 613 {
 614         struct web_session *session = user_data;
 615         guint8 *ptr = session->receive_buffer;
 616         gsize bytes_read;
 617         GIOStatus status;
 618
 619         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 620                 session->transport_watch = 0;
 621                 session->result.buffer = NULL;
 622                 session->result.length = 0;
 623                 call_result_func(session, 400);
 624                 return FALSE;
 625         }
 626
 627         status = g_io_channel_read_chars(channel,
 628                                 (gchar *) session->receive_buffer,
 629                                 session->receive_space - 1, &bytes_read, NULL);
 630
 631         debug(session->web, "bytes read %zu", bytes_read);
 632
 633         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 634                 session->transport_watch = 0;
 635                 session->result.buffer = NULL;
 636                 session->result.length = 0;
 637                 call_result_func(session, 0);
 638                 return FALSE;
 639         }
 640
 641         session->receive_buffer[bytes_read] = '\0';
 642
 643         if (session->header_done == TRUE) {
 644                 if (handle_body(session, session->receive_buffer,
 645                                                         bytes_read) < 0) {
 646                         session->transport_watch = 0;
 647                         return FALSE;
 648                 }
 649                 return TRUE;
 650         }
 651
 652         while (bytes_read > 0) {
 653                 guint8 *pos;
 654                 gsize count;
 655                 char *str;
 656
 657                 pos = memchr(ptr, '\n', bytes_read);
 658                 if (pos == NULL) {
 659                         g_string_append_len(session->current_header,
 660                                                 (gchar *) ptr, bytes_read);
 661                         return TRUE;
 662                 }
 663
 664                 *pos = '\0';
 665                 count = strlen((char *) ptr);
 666                 if (count > 0 && ptr[count - 1] == '\r') {
 667                         ptr[--count] = '\0';
 668                         bytes_read--;
 669                 }
 670
 671                 g_string_append_len(session->current_header,
 672                                                 (gchar *) ptr, count);
 673
 674                 bytes_read -= count + 1;
 675                 if (bytes_read > 0)
 676                         ptr = pos + 1;
 677                 else
 678                         ptr = NULL;
 679
 680                 if (session->current_header->len == 0) {
 681                         session->header_done = TRUE;
 682                         if (handle_body(session, ptr, bytes_read) < 0) {
 683                                 session->transport_watch = 0;
 684                                 return FALSE;
 685                         }
 686                         break;
 687                 }
 688
 689                 str = session->current_header->str;
 690
 691                 if (session->result.status == 0) {
 692                         unsigned int code;
 693
 694                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 695                                 session->result.status = code;
 696                 } else if (session->result.use_chunk == FALSE &&
 697                                 g_ascii_strncasecmp("Transfer-Encoding:",
 698                                                                 str, 18) == 0) {
 699                         char *val;
 700
 701                         val = g_strrstr(str + 18, "chunked");
 702                         if (val != NULL) {
 703                                 session->result.use_chunk = TRUE;
 704
 705                                 session->chunck_state = CHUNK_SIZE;
 706                                 session->chunk_left = 0;
 707                                 session->chunk_left = 0;
 708                                 session->total_len = 0;
 709                         }
 710                 }
 711
 712                 debug(session->web, "[header] %s", str);
 713
 714                 g_string_truncate(session->current_header, 0);
 715         }
 716
 717         return TRUE;
 718 }
 719
 720 static int connect_session_transport(struct web_session *session)
 721 {
 722         GIOFlags flags;
 723         struct sockaddr_in sin;
 724         int sk;
 725
 726         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 727         if (sk < 0)
 728                 return -EIO;
 729
 730         if (session->flags & SESSION_FLAG_USE_TLS)
 731                 session->transport_channel = g_io_channel_gnutls_new(sk);
 732         else
 733                 session->transport_channel = g_io_channel_unix_new(sk);
 734
 735         if (session->transport_channel == NULL) {
 736                 close(sk);
 737                 return -ENOMEM;
 738         }
 739
 740         flags = g_io_channel_get_flags(session->transport_channel);
 741         g_io_channel_set_flags(session->transport_channel,
 742                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 743
 744         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 745         g_io_channel_set_buffered(session->transport_channel, FALSE);
 746
 747         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 748
 749         memset(&sin, 0, sizeof(sin));
 750         sin.sin_family = AF_INET;
 751         sin.sin_port = htons(session->port);
 752         sin.sin_addr.s_addr = inet_addr(session->address);
 753
 754         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 755                 if (errno != EINPROGRESS) {
 756                         close(sk);
 757                         return -EIO;
 758                 }
 759         }
 760
 761         session->transport_watch = g_io_add_watch(session->transport_channel,
 762                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 763                                                 received_data, session);
 764
 765         session->send_watch = g_io_add_watch(session->transport_channel,
 766                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 767                                                 send_data, session);
 768
 769         return 0;
 770 }
 771
 772 static int create_transport(struct web_session *session)
 773 {
 774         int err;
 775
 776         err = connect_session_transport(session);
 777         if (err < 0)
 778                 return err;
 779
 780         debug(session->web, "creating session %s:%u",
 781                                         session->address, session->port);
 782
 783         return 0;
 784 }
 785
 786 static int parse_url(struct web_session *session, const char *url)
 787 {
 788         char *scheme, *host, *port, *path;
 789
 790         scheme = g_strdup(url);
 791         if (scheme == NULL)
 792                 return -EINVAL;
 793
 794         host = strstr(scheme, "://");
 795         if (host != NULL) {
 796                 *host = '\0';
 797                 host += 3;
 798
 799                 if (strcasecmp(scheme, "https") == 0) {
 800                         session->port = 443;
 801                         session->flags |= SESSION_FLAG_USE_TLS;
 802                 } else if (strcasecmp(scheme, "http") == 0) {
 803                         session->port = 80;
 804                 } else {
 805                         g_free(scheme);
 806                         return -EINVAL;
 807                 }
 808         } else {
 809                 host = scheme;
 810                 session->port = 80;
 811         }
 812
 813         path = strchr(host, '/');
 814         if (path != NULL)
 815                 *(path++) = '\0';
 816
 817         session->request = g_strdup_printf("/%s", path ? path : "");
 818
 819         port = strrchr(host, ':');
 820         if (port != NULL) {
 821                 char *end;
 822                 int tmp = strtol(port + 1, &end, 10);
 823
 824                 if (*end == '\0') {
 825                         *port = '\0';
 826                         session->port = tmp;
 827                 }
 828         }
 829
 830         session->host = g_strdup(host);
 831
 832         g_free(scheme);
 833
 834         return 0;
 835 }
 836
 837 static void resolv_result(GResolvResultStatus status,
 838                                         char **results, gpointer user_data)
 839 {
 840         struct web_session *session = user_data;
 841
 842         if (results == NULL || results[0] == NULL) {
 843                 call_result_func(session, 404);
 844                 return;
 845         }
 846
 847         debug(session->web, "address %s", results[0]);
 848
 849         if (inet_aton(results[0], NULL) == 0) {
 850                 call_result_func(session, 400);
 851                 return;
 852         }
 853
 854         session->address = g_strdup(results[0]);
 855
 856         if (create_transport(session) < 0) {
 857                 call_result_func(session, 409);
 858                 return;
 859         }
 860 }
 861
 862 static guint do_request(GWeb *web, const char *url,
 863                                 const char *type, GWebInputFunc input,
 864                                 GWebResultFunc func, gpointer user_data)
 865 {
 866         struct web_session *session;
 867
 868         if (web == NULL || url == NULL)
 869                 return 0;
 870
 871         debug(web, "request %s", url);
 872
 873         session = g_try_new0(struct web_session, 1);
 874         if (session == NULL)
 875                 return 0;
 876
 877         if (parse_url(session, url) < 0) {
 878                 free_session(session);
 879                 return 0;
 880         }
 881
 882         debug(web, "host %s:%u", session->host, session->port);
 883         debug(web, "flags %lu", session->flags);
 884
 885         if (type != NULL) {
 886                 session->content_type = g_strdup(type);
 887
 888                 debug(web, "content-type %s", session->content_type);
 889         }
 890
 891         session->web = web;
 892
 893         session->result_func = func;
 894         session->input_func = input;
 895         session->user_data = user_data;
 896
 897         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 898         if (session->receive_buffer == NULL) {
 899                 free_session(session);
 900                 return 0;
 901         }
 902
 903         session->receive_space = DEFAULT_BUFFER_SIZE;
 904         session->send_buffer = g_string_sized_new(0);
 905         session->current_header = g_string_sized_new(0);
 906         session->header_done = FALSE;
 907         session->body_done = FALSE;
 908
 909         if (inet_aton(session->host, NULL) == 0) {
 910                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 911                                         session->host, resolv_result, session);
 912                 if (session->resolv_action == 0) {
 913                         free_session(session);
 914                         return 0;
 915                 }
 916         } else {
 917                 session->address = g_strdup(session->host);
 918
 919                 if (create_transport(session) < 0) {
 920                         free_session(session);
 921                         return 0;
 922                 }
 923         }
 924
 925         web->session_list = g_list_append(web->session_list, session);
 926
 927         return web->next_query_id++;
 928 }
 929
 930 guint g_web_request_get(GWeb *web, const char *url,
 931                                 GWebResultFunc func, gpointer user_data)
 932 {
 933         return do_request(web, url, NULL, NULL, func, user_data);
 934 }
 935
 936 guint g_web_request_post(GWeb *web, const char *url,
 937                                 const char *type, GWebInputFunc input,
 938                                 GWebResultFunc func, gpointer user_data)
 939 {
 940         return do_request(web, url, type, input, func, user_data);
 941 }
 942
 943 gboolean g_web_cancel_request(GWeb *web, guint id)
 944 {
 945         if (web == NULL)
 946                 return FALSE;
 947
 948         return TRUE;
 949 }
 950
 951 guint16 g_web_result_get_status(GWebResult *result)
 952 {
 953         if (result == NULL)
 954                 return 0;
 955
 956         return result->status;
 957 }
 958
 959 gboolean g_web_result_get_chunk(GWebResult *result,
 960                                 const guint8 **chunk, gsize *length)
 961 {
 962         if (result == NULL)
 963                 return FALSE;
 964
 965         if (chunk == NULL)
 966                 return FALSE;
 967
 968         *chunk = result->buffer;
 969
 970         if (length != NULL)
 971                 *length = result->length;
 972
 973         return TRUE;
 974 }
 975
 976 struct _GWebParser {
 977         gint ref_count;
 978         char *begin_token;
 979         char *end_token;
 980         const char *token_str;
 981         size_t token_len;
 982         size_t token_pos;
 983         gboolean intoken;
 984         GString *content;
 985         GWebParserFunc func;
 986         gpointer user_data;
 987 };
 988
 989 GWebParser *g_web_parser_new(const char *begin, const char *end,
 990                                 GWebParserFunc func, gpointer user_data)
 991 {
 992         GWebParser *parser;
 993
 994         parser = g_try_new0(GWebParser, 1);
 995         if (parser == NULL)
 996                 return NULL;
 997
 998         parser->ref_count = 1;
 999
1000         parser->begin_token = g_strdup(begin);
1001         parser->end_token = g_strdup(end);
1002
1003         if (parser->begin_token == NULL) {
1004                 g_free(parser);
1005                 return NULL;
1006         }
1007
1008         parser->func = func;
1009         parser->user_data = user_data;
1010
1011         parser->token_str = parser->begin_token;
1012         parser->token_len = strlen(parser->token_str);
1013         parser->token_pos = 0;
1014
1015         parser->intoken = FALSE;
1016         parser->content = g_string_sized_new(0);
1017
1018         return parser;
1019 }
1020
1021 GWebParser *g_web_parser_ref(GWebParser *parser)
1022 {
1023         if (parser == NULL)
1024                 return NULL;
1025
1026         g_atomic_int_inc(&parser->ref_count);
1027
1028         return parser;
1029 }
1030
1031 void g_web_parser_unref(GWebParser *parser)
1032 {
1033         if (parser == NULL)
1034                 return;
1035
1036         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1037                 return;
1038
1039         g_string_free(parser->content, TRUE);
1040
1041         g_free(parser->begin_token);
1042         g_free(parser->end_token);
1043         g_free(parser);
1044 }
1045
1046 void g_web_parser_feed_data(GWebParser *parser,
1047                                 const guint8 *data, gsize length)
1048 {
1049         const guint8 *ptr = data;
1050
1051         if (parser == NULL)
1052                 return;
1053
1054         while (length > 0) {
1055                 guint8 chr = parser->token_str[parser->token_pos];
1056
1057                 if (parser->token_pos == 0) {
1058                         guint8 *pos;
1059
1060                         pos = memchr(ptr, chr, length);
1061                         if (pos == NULL) {
1062                                 if (parser->intoken == TRUE)
1063                                         g_string_append_len(parser->content,
1064                                                         (gchar *) ptr, length);
1065                                 break;
1066                         }
1067
1068                         if (parser->intoken == TRUE)
1069                                 g_string_append_len(parser->content,
1070                                                 (gchar *) ptr, (pos - ptr) + 1);
1071
1072                         length -= (pos - ptr) + 1;
1073                         ptr = pos + 1;
1074
1075                         parser->token_pos++;
1076                         continue;
1077                 }
1078
1079                 if (parser->intoken == TRUE)
1080                         g_string_append_c(parser->content, ptr[0]);
1081
1082                 if (ptr[0] != chr) {
1083                         length--;
1084                         ptr++;
1085
1086                         parser->token_pos = 0;
1087                         continue;
1088                 }
1089
1090                 length--;
1091                 ptr++;
1092
1093                 parser->token_pos++;
1094
1095                 if (parser->token_pos == parser->token_len) {
1096                         if (parser->intoken == FALSE) {
1097                                 g_string_append(parser->content,
1098                                                         parser->token_str);
1099
1100                                 parser->intoken = TRUE;
1101                                 parser->token_str = parser->end_token;
1102                                 parser->token_len = strlen(parser->end_token);
1103                                 parser->token_pos = 0;
1104                         } else {
1105                                 char *str;
1106                                 str = g_string_free(parser->content, FALSE);
1107                                 parser->content = g_string_sized_new(0);
1108                                 if (parser->func)
1109                                         parser->func(str, parser->user_data);
1110                                 g_free(str);
1111
1112                                 parser->intoken = FALSE;
1113                                 parser->token_str = parser->begin_token;
1114                                 parser->token_len = strlen(parser->begin_token);
1115                                 parser->token_pos = 0;
1116                         }
1117                 }
1118         }
1119 }
1120
1121 void g_web_parser_end_data(GWebParser *parser)
1122 {
1123         if (parser == NULL)
1124                 return;
1125 }