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         if (session->result.use_chunk == FALSE) {
 591                 session->result.buffer = buf;
 592                 session->result.length = len;
 593                 call_result_func(session, 0);
 594                 return 0;
 595         }
 596
 597         err = decode_chunked(session, buf, len);
 598         if (err < 0) {
 599                 debug(session->web, "Error in chunk decode %d", err);
 600
 601                 session->result.buffer = NULL;
 602                 session->result.length = 0;
 603                 call_result_func(session, 400);
 604         }
 605
 606         return err;
 607 }
 608
 609 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 610                                                         gpointer user_data)
 611 {
 612         struct web_session *session = user_data;
 613         guint8 *ptr = session->receive_buffer;
 614         gsize bytes_read;
 615         GIOStatus status;
 616
 617         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 618                 session->transport_watch = 0;
 619                 session->result.buffer = NULL;
 620                 session->result.length = 0;
 621                 call_result_func(session, 400);
 622                 return FALSE;
 623         }
 624
 625         status = g_io_channel_read_chars(channel,
 626                                 (gchar *) session->receive_buffer,
 627                                 session->receive_space - 1, &bytes_read, NULL);
 628
 629         debug(session->web, "bytes read %zu", bytes_read);
 630
 631         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 632                 session->transport_watch = 0;
 633                 session->result.buffer = NULL;
 634                 session->result.length = 0;
 635                 call_result_func(session, 0);
 636                 return FALSE;
 637         }
 638
 639         session->receive_buffer[bytes_read] = '\0';
 640
 641         if (session->header_done == TRUE) {
 642                 if (handle_body(session,
 643                                 session->receive_buffer, bytes_read) < 0) {
 644                         session->transport_watch = 0;
 645                         return FALSE;
 646                 }
 647                 return TRUE;
 648         }
 649
 650         while (bytes_read > 0) {
 651                 guint8 *pos;
 652                 gsize count;
 653                 char *str;
 654
 655                 pos = memchr(ptr, '\n', bytes_read);
 656                 if (pos == NULL) {
 657                         g_string_append_len(session->current_header,
 658                                                 (gchar *) ptr, bytes_read);
 659                         return TRUE;
 660                 }
 661
 662                 *pos = '\0';
 663                 count = strlen((char *) ptr);
 664                 if (count > 0 && ptr[count - 1] == '\r') {
 665                         ptr[--count] = '\0';
 666                         bytes_read--;
 667                 }
 668
 669                 g_string_append_len(session->current_header,
 670                                                 (gchar *) ptr, count);
 671
 672                 bytes_read -= count + 1;
 673                 if (bytes_read > 0)
 674                         ptr = pos + 1;
 675                 else
 676                         ptr = NULL;
 677
 678                 if (session->current_header->len == 0) {
 679                         session->header_done = TRUE;
 680                         if (handle_body(session, ptr, bytes_read) < 0) {
 681                                 session->transport_watch = 0;
 682                                 return FALSE;
 683                         }
 684                         break;
 685                 }
 686
 687                 str = session->current_header->str;
 688
 689                 if (session->result.status == 0) {
 690                         unsigned int code;
 691
 692                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 693                                 session->result.status = code;
 694                 } else if (session->result.use_chunk == FALSE &&
 695                                 g_ascii_strncasecmp("Transfer-Encoding:",
 696                                                                 str, 18) == 0) {
 697                         char *val;
 698
 699                         val = g_strrstr(str + 18, "chunked");
 700                         if (val != NULL) {
 701                                 session->result.use_chunk = TRUE;
 702
 703                                 session->chunck_state = CHUNK_SIZE;
 704                                 session->chunk_left = 0;
 705                                 session->chunk_left = 0;
 706                                 session->total_len = 0;
 707                         }
 708                 }
 709
 710                 debug(session->web, "[header] %s", str);
 711
 712                 g_string_truncate(session->current_header, 0);
 713         }
 714
 715         return TRUE;
 716 }
 717
 718 static int connect_session_transport(struct web_session *session)
 719 {
 720         struct sockaddr_in sin;
 721         int sk;
 722
 723         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 724         if (sk < 0)
 725                 return -EIO;
 726
 727         memset(&sin, 0, sizeof(sin));
 728         sin.sin_family = AF_INET;
 729         sin.sin_port = htons(session->port);
 730         sin.sin_addr.s_addr = inet_addr(session->address);
 731
 732         if (session->flags & SESSION_FLAG_USE_TLS)
 733                 session->transport_channel = g_io_channel_gnutls_new(sk);
 734         else
 735                 session->transport_channel = g_io_channel_unix_new(sk);
 736
 737         if (session->transport_channel == NULL) {
 738                 close(sk);
 739                 return -ENOMEM;
 740         }
 741
 742         g_io_channel_set_flags(session->transport_channel,
 743                                         G_IO_FLAG_NONBLOCK, NULL);
 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         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 750                 if (errno != EINPROGRESS) {
 751                         close(sk);
 752                         return -EIO;
 753                 }
 754         }
 755
 756         session->transport_watch = g_io_add_watch(session->transport_channel,
 757                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 758                                                 received_data, session);
 759
 760         session->send_watch = g_io_add_watch(session->transport_channel,
 761                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 762                                                 send_data, session);
 763
 764         return 0;
 765 }
 766
 767 static int create_transport(struct web_session *session)
 768 {
 769         int err;
 770
 771         err = connect_session_transport(session);
 772         if (err < 0)
 773                 return err;
 774
 775         debug(session->web, "creating session %s:%u",
 776                                         session->address, session->port);
 777
 778         return 0;
 779 }
 780
 781 static int parse_url(struct web_session *session, const char *url)
 782 {
 783         char *scheme, *host, *port, *path;
 784
 785         scheme = g_strdup(url);
 786         if (scheme == NULL)
 787                 return -EINVAL;
 788
 789         host = strstr(scheme, "://");
 790         if (host != NULL) {
 791                 *host = '\0';
 792                 host += 3;
 793
 794                 if (strcasecmp(scheme, "https") == 0) {
 795                         session->port = 443;
 796                         session->flags |= SESSION_FLAG_USE_TLS;
 797                 } else if (strcasecmp(scheme, "http") == 0) {
 798                         session->port = 80;
 799                 } else {
 800                         g_free(scheme);
 801                         return -EINVAL;
 802                 }
 803         } else {
 804                 host = scheme;
 805                 session->port = 80;
 806         }
 807
 808         path = strchr(host, '/');
 809         if (path != NULL)
 810                 *(path++) = '\0';
 811
 812         session->request = g_strdup_printf("/%s", path ? path : "");
 813
 814         port = strrchr(host, ':');
 815         if (port != NULL) {
 816                 char *end;
 817                 int tmp = strtol(port + 1, &end, 10);
 818
 819                 if (*end == '\0') {
 820                         *port = '\0';
 821                         session->port = tmp;
 822                 }
 823         }
 824
 825         session->host = g_strdup(host);
 826
 827         g_free(scheme);
 828
 829         return 0;
 830 }
 831
 832 static void resolv_result(GResolvResultStatus status,
 833                                         char **results, gpointer user_data)
 834 {
 835         struct web_session *session = user_data;
 836
 837         if (results == NULL || results[0] == NULL) {
 838                 call_result_func(session, 404);
 839                 return;
 840         }
 841
 842         debug(session->web, "address %s", results[0]);
 843
 844         if (inet_aton(results[0], NULL) == 0) {
 845                 call_result_func(session, 400);
 846                 return;
 847         }
 848
 849         session->address = g_strdup(results[0]);
 850
 851         if (create_transport(session) < 0) {
 852                 call_result_func(session, 409);
 853                 return;
 854         }
 855 }
 856
 857 static guint do_request(GWeb *web, const char *url,
 858                                 const char *type, GWebInputFunc input,
 859                                 GWebResultFunc func, gpointer user_data)
 860 {
 861         struct web_session *session;
 862
 863         if (web == NULL || url == NULL)
 864                 return 0;
 865
 866         debug(web, "request %s", url);
 867
 868         session = g_try_new0(struct web_session, 1);
 869         if (session == NULL)
 870                 return 0;
 871
 872         if (parse_url(session, url) < 0) {
 873                 free_session(session);
 874                 return 0;
 875         }
 876
 877         debug(web, "host %s:%u", session->host, session->port);
 878         debug(web, "flags %lu", session->flags);
 879
 880         if (type != NULL) {
 881                 session->content_type = g_strdup(type);
 882
 883                 debug(web, "content-type %s", session->content_type);
 884         }
 885
 886         session->web = web;
 887
 888         session->result_func = func;
 889         session->input_func = input;
 890         session->user_data = user_data;
 891
 892         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 893         if (session->receive_buffer == NULL) {
 894                 free_session(session);
 895                 return 0;
 896         }
 897
 898         session->receive_space = DEFAULT_BUFFER_SIZE;
 899         session->send_buffer = g_string_sized_new(0);
 900         session->current_header = g_string_sized_new(0);
 901         session->header_done = FALSE;
 902         session->body_done = FALSE;
 903
 904         if (inet_aton(session->host, NULL) == 0) {
 905                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 906                                         session->host, resolv_result, session);
 907                 if (session->resolv_action == 0) {
 908                         free_session(session);
 909                         return 0;
 910                 }
 911         } else {
 912                 session->address = g_strdup(session->host);
 913
 914                 if (create_transport(session) < 0) {
 915                         free_session(session);
 916                         return 0;
 917                 }
 918         }
 919
 920         web->session_list = g_list_append(web->session_list, session);
 921
 922         return web->next_query_id++;
 923 }
 924
 925 guint g_web_request_get(GWeb *web, const char *url,
 926                                 GWebResultFunc func, gpointer user_data)
 927 {
 928         return do_request(web, url, NULL, NULL, func, user_data);
 929 }
 930
 931 guint g_web_request_post(GWeb *web, const char *url,
 932                                 const char *type, GWebInputFunc input,
 933                                 GWebResultFunc func, gpointer user_data)
 934 {
 935         return do_request(web, url, type, input, func, user_data);
 936 }
 937
 938 gboolean g_web_cancel_request(GWeb *web, guint id)
 939 {
 940         if (web == NULL)
 941                 return FALSE;
 942
 943         return TRUE;
 944 }
 945
 946 guint16 g_web_result_get_status(GWebResult *result)
 947 {
 948         if (result == NULL)
 949                 return 0;
 950
 951         return result->status;
 952 }
 953
 954 gboolean g_web_result_get_chunk(GWebResult *result,
 955                                 const guint8 **chunk, gsize *length)
 956 {
 957         if (result == NULL)
 958                 return FALSE;
 959
 960         if (chunk == NULL)
 961                 return FALSE;
 962
 963         *chunk = result->buffer;
 964
 965         if (length != NULL)
 966                 *length = result->length;
 967
 968         return TRUE;
 969 }
 970
 971 struct _GWebParser {
 972         gint ref_count;
 973         char *begin_token;
 974         char *end_token;
 975         const char *token_str;
 976         size_t token_len;
 977         size_t token_pos;
 978         gboolean intoken;
 979         GString *content;
 980         GWebParserFunc func;
 981         gpointer user_data;
 982 };
 983
 984 GWebParser *g_web_parser_new(const char *begin, const char *end,
 985                                 GWebParserFunc func, gpointer user_data)
 986 {
 987         GWebParser *parser;
 988
 989         parser = g_try_new0(GWebParser, 1);
 990         if (parser == NULL)
 991                 return NULL;
 992
 993         parser->ref_count = 1;
 994
 995         parser->begin_token = g_strdup(begin);
 996         parser->end_token = g_strdup(end);
 997
 998         if (parser->begin_token == NULL) {
 999                 g_free(parser);
1000                 return NULL;
1001         }
1002
1003         parser->func = func;
1004         parser->user_data = user_data;
1005
1006         parser->token_str = parser->begin_token;
1007         parser->token_len = strlen(parser->token_str);
1008         parser->token_pos = 0;
1009
1010         parser->intoken = FALSE;
1011         parser->content = g_string_sized_new(0);
1012
1013         return parser;
1014 }
1015
1016 GWebParser *g_web_parser_ref(GWebParser *parser)
1017 {
1018         if (parser == NULL)
1019                 return NULL;
1020
1021         g_atomic_int_inc(&parser->ref_count);
1022
1023         return parser;
1024 }
1025
1026 void g_web_parser_unref(GWebParser *parser)
1027 {
1028         if (parser == NULL)
1029                 return;
1030
1031         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1032                 return;
1033
1034         g_string_free(parser->content, TRUE);
1035
1036         g_free(parser->begin_token);
1037         g_free(parser->end_token);
1038         g_free(parser);
1039 }
1040
1041 void g_web_parser_feed_data(GWebParser *parser,
1042                                 const guint8 *data, gsize length)
1043 {
1044         const guint8 *ptr = data;
1045
1046         if (parser == NULL)
1047                 return;
1048
1049         while (length > 0) {
1050                 guint8 chr = parser->token_str[parser->token_pos];
1051
1052                 if (parser->token_pos == 0) {
1053                         guint8 *pos;
1054
1055                         pos = memchr(ptr, chr, length);
1056                         if (pos == NULL) {
1057                                 if (parser->intoken == TRUE)
1058                                         g_string_append_len(parser->content,
1059                                                         (gchar *) ptr, length);
1060                                 break;
1061                         }
1062
1063                         if (parser->intoken == TRUE)
1064                                 g_string_append_len(parser->content,
1065                                                 (gchar *) ptr, (pos - ptr) + 1);
1066
1067                         length -= (pos - ptr) + 1;
1068                         ptr = pos + 1;
1069
1070                         parser->token_pos++;
1071                         continue;
1072                 }
1073
1074                 if (parser->intoken == TRUE)
1075                         g_string_append_c(parser->content, ptr[0]);
1076
1077                 if (ptr[0] != chr) {
1078                         length--;
1079                         ptr++;
1080
1081                         parser->token_pos = 0;
1082                         continue;
1083                 }
1084
1085                 length--;
1086                 ptr++;
1087
1088                 parser->token_pos++;
1089
1090                 if (parser->token_pos == parser->token_len) {
1091                         if (parser->intoken == FALSE) {
1092                                 g_string_append(parser->content,
1093                                                         parser->token_str);
1094
1095                                 parser->intoken = TRUE;
1096                                 parser->token_str = parser->end_token;
1097                                 parser->token_len = strlen(parser->end_token);
1098                                 parser->token_pos = 0;
1099                         } else {
1100                                 char *str;
1101                                 str = g_string_free(parser->content, FALSE);
1102                                 parser->content = g_string_sized_new(0);
1103                                 if (parser->func)
1104                                         parser->func(str, parser->user_data);
1105                                 g_free(str);
1106
1107                                 parser->intoken = FALSE;
1108                                 parser->token_str = parser->begin_token;
1109                                 parser->token_len = strlen(parser->begin_token);
1110                                 parser->token_pos = 0;
1111                         }
1112                 }
1113         }
1114 }
1115
1116 void g_web_parser_end_data(GWebParser *parser)
1117 {
1118         if (parser == NULL)
1119                 return;
1120 }