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