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