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         char *http_version;
 108         gboolean close_connection;
 109
 110         GWebDebugFunc debug_func;
 111         gpointer debug_data;
 112 };
 113
 114 static inline void debug(GWeb *web, const char *format, ...)
 115 {
 116         char str[256];
 117         va_list ap;
 118
 119         if (web->debug_func == NULL)
 120                 return;
 121
 122         va_start(ap, format);
 123
 124         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 125                 web->debug_func(str, web->debug_data);
 126
 127         va_end(ap);
 128 }
 129
 130 static void free_session(struct web_session *session)
 131 {
 132         GWeb *web = session->web;
 133
 134         if (session == NULL)
 135                 return;
 136
 137         g_free(session->request);
 138
 139         if (session->resolv_action > 0)
 140                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 141
 142         if (session->transport_watch > 0)
 143                 g_source_remove(session->transport_watch);
 144
 145         if (session->send_watch > 0)
 146                 g_source_remove(session->send_watch);
 147
 148         if (session->transport_channel != NULL)
 149                 g_io_channel_unref(session->transport_channel);
 150
 151         g_string_free(session->send_buffer, TRUE);
 152         g_string_free(session->current_header, TRUE);
 153         g_free(session->receive_buffer);
 154
 155         g_free(session->content_type);
 156
 157         g_free(session->host);
 158         g_free(session->address);
 159         g_free(session);
 160 }
 161
 162 static void flush_sessions(GWeb *web)
 163 {
 164         GList *list;
 165
 166         for (list = g_list_first(web->session_list);
 167                                         list; list = g_list_next(list))
 168                 free_session(list->data);
 169
 170         g_list_free(web->session_list);
 171         web->session_list = NULL;
 172 }
 173
 174 GWeb *g_web_new(int index)
 175 {
 176         GWeb *web;
 177
 178         if (index < 0)
 179                 return NULL;
 180
 181         web = g_try_new0(GWeb, 1);
 182         if (web == NULL)
 183                 return NULL;
 184
 185         web->ref_count = 1;
 186
 187         web->next_query_id = 1;
 188
 189         web->index = index;
 190         web->session_list = NULL;
 191
 192         web->resolv = g_resolv_new(index);
 193         if (web->resolv == NULL) {
 194                 g_free(web);
 195                 return NULL;
 196         }
 197
 198         web->accept_option = g_strdup("*/*");
 199         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 200         web->close_connection = FALSE;
 201
 202         return web;
 203 }
 204
 205 GWeb *g_web_ref(GWeb *web)
 206 {
 207         if (web == NULL)
 208                 return NULL;
 209
 210         g_atomic_int_inc(&web->ref_count);
 211
 212         return web;
 213 }
 214
 215 void g_web_unref(GWeb *web)
 216 {
 217         if (web == NULL)
 218                 return;
 219
 220         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 221                 return;
 222
 223         flush_sessions(web);
 224
 225         g_resolv_unref(web->resolv);
 226
 227         g_free(web->proxy);
 228
 229         g_free(web->accept_option);
 230         g_free(web->user_agent);
 231         g_free(web->http_version);
 232
 233         g_free(web);
 234 }
 235
 236 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 237 {
 238         if (web == NULL)
 239                 return;
 240
 241         web->debug_func = func;
 242         web->debug_data = user_data;
 243
 244         g_resolv_set_debug(web->resolv, func, user_data);
 245 }
 246
 247 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 248 {
 249         if (web == NULL)
 250                 return FALSE;
 251
 252         g_free(web->proxy);
 253         web->proxy = g_strdup(proxy);
 254
 255         return TRUE;
 256 }
 257
 258 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 259 {
 260         if (web == NULL)
 261                 return FALSE;
 262
 263         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 264
 265         return TRUE;
 266 }
 267
 268 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 269 {
 270         g_free(web->accept_option);
 271
 272         if (format == NULL) {
 273                 web->accept_option = NULL;
 274                 debug(web, "clearing accept option");
 275         } else {
 276                 web->accept_option = g_strdup_vprintf(format, args);
 277                 debug(web, "setting accept %s", web->accept_option);
 278         }
 279
 280         return TRUE;
 281 }
 282
 283 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 284 {
 285         va_list args;
 286         gboolean result;
 287
 288         if (web == NULL)
 289                 return FALSE;
 290
 291         va_start(args, format);
 292         result = set_accept_option(web, format, args);
 293         va_end(args);
 294
 295         return result;
 296 }
 297
 298 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 299 {
 300         g_free(web->user_agent);
 301
 302         if (format == NULL) {
 303                 web->user_agent = NULL;
 304                 debug(web, "clearing user agent");
 305         } else {
 306                 web->user_agent = g_strdup_vprintf(format, args);
 307                 debug(web, "setting user agent %s", web->user_agent);
 308         }
 309
 310         return TRUE;
 311 }
 312
 313 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 314 {
 315         va_list args;
 316         gboolean result;
 317
 318         if (web == NULL)
 319                 return FALSE;
 320
 321         va_start(args, format);
 322         result = set_user_agent(web, format, args);
 323         va_end(args);
 324
 325         return result;
 326 }
 327
 328 gboolean g_web_set_http_version(GWeb *web, const char *version)
 329 {
 330         if (web == NULL)
 331                 return FALSE;
 332
 333         g_free(web->http_version);
 334
 335         if (version == NULL) {
 336                 web->http_version = NULL;
 337                 debug(web, "clearing HTTP version");
 338         } else {
 339                 web->http_version = g_strdup(version);
 340                 debug(web, "setting HTTP version %s", web->http_version);
 341         }
 342
 343         return TRUE;
 344 }
 345
 346 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 347 {
 348         if (web == NULL)
 349                 return;
 350
 351         web->close_connection = enabled;
 352 }
 353
 354 gboolean g_web_get_close_connection(GWeb *web)
 355 {
 356         if (web == NULL)
 357                 return FALSE;
 358
 359         return web->close_connection;
 360 }
 361
 362 static inline void call_result_func(struct web_session *session, guint16 status)
 363 {
 364         gboolean result;
 365
 366         if (session->result_func == NULL)
 367                 return;
 368
 369         if (status != 0)
 370                 session->result.status = status;
 371
 372         result = session->result_func(&session->result, session->user_data);
 373
 374         debug(session->web, "[result function] %s",
 375                                         result == TRUE ? "continue" : "stop");
 376 }
 377
 378 static gboolean process_send_buffer(struct web_session *session)
 379 {
 380         GString *buf = session->send_buffer;
 381         gsize count, bytes_written;
 382         GIOStatus status;
 383
 384         count = buf->len;
 385
 386         if (count == 0) {
 387                 if (session->more_data == FALSE)
 388                         session->body_done = TRUE;
 389
 390                 return FALSE;
 391         }
 392
 393         debug(session->web, "bytes to write %zu", count);
 394
 395         status = g_io_channel_write_chars(session->transport_channel,
 396                                         buf->str, count, &bytes_written, NULL);
 397
 398         debug(session->web, "status %u bytes written %zu",
 399                                         status, bytes_written);
 400
 401         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 402                 return FALSE;
 403
 404         g_string_erase(buf, 0, bytes_written);
 405
 406         return TRUE;
 407 }
 408
 409 static void process_next_chunk(struct web_session *session)
 410 {
 411         GString *buf = session->send_buffer;
 412         const guint8 *body;
 413         gsize length;
 414
 415         if (session->input_func == NULL) {
 416                 session->more_data = FALSE;
 417                 return;
 418         }
 419
 420         session->more_data = session->input_func(&body, &length,
 421                                                 session->user_data);
 422
 423         if (length > 0) {
 424                 g_string_append_printf(buf, "%zx\r\n", length);
 425                 g_string_append_len(buf, (char *) body, length);
 426                 g_string_append(buf, "\r\n");
 427         }
 428
 429         if (session->more_data == FALSE)
 430                 g_string_append(buf, "0\r\n\r\n");
 431 }
 432
 433 static void start_request(struct web_session *session)
 434 {
 435         GString *buf = session->send_buffer;
 436         const char *version;
 437         const guint8 *body;
 438         gsize length;
 439
 440         debug(session->web, "request %s from %s",
 441                                         session->request, session->host);
 442
 443         g_string_truncate(buf, 0);
 444
 445         if (session->web->http_version == NULL)
 446                 version = "1.1";
 447         else
 448                 version = session->web->http_version;
 449
 450         if (session->content_type == NULL)
 451                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 452                                                 session->request, version);
 453         else
 454                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 455                                                 session->request, version);
 456
 457         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 458
 459         if (session->web->user_agent != NULL)
 460                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 461                                                 session->web->user_agent);
 462
 463         if (session->web->accept_option != NULL)
 464                 g_string_append_printf(buf, "Accept: %s\r\n",
 465                                                 session->web->accept_option);
 466
 467         if (session->content_type != NULL) {
 468                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 469                                                         session->content_type);
 470                 if (session->input_func == NULL) {
 471                         session->more_data = FALSE;
 472                         length = 0;
 473                 } else
 474                         session->more_data = session->input_func(&body, &length,
 475                                                         session->user_data);
 476                 if (session->more_data == FALSE)
 477                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 478                                                                         length);
 479                 else
 480                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 481         }
 482
 483         if (session->web->close_connection == TRUE)
 484                 g_string_append(buf, "Connection: close\r\n");
 485
 486         g_string_append(buf, "\r\n");
 487
 488         if (session->content_type != NULL && length > 0) {
 489                 if (session->more_data == TRUE) {
 490                         g_string_append_printf(buf, "%zx\r\n", length);
 491                         g_string_append_len(buf, (char *) body, length);
 492                         g_string_append(buf, "\r\n");
 493                 } else
 494                         g_string_append_len(buf, (char *) body, length);
 495         }
 496 }
 497
 498 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 499                                                 gpointer user_data)
 500 {
 501         struct web_session *session = user_data;
 502
 503         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 504                 session->send_watch = 0;
 505                 return FALSE;
 506         }
 507
 508         if (process_send_buffer(session) == TRUE)
 509                 return TRUE;
 510
 511         if (session->request_started == FALSE) {
 512                 session->request_started = TRUE;
 513                 start_request(session);
 514         } else if (session->more_data == TRUE)
 515                 process_next_chunk(session);
 516
 517         process_send_buffer(session);
 518
 519         if (session->body_done == TRUE) {
 520                 session->send_watch = 0;
 521                 return FALSE;
 522         }
 523
 524         return TRUE;
 525 }
 526
 527 static int decode_chunked(struct web_session *session,
 528                                         const guint8 *buf, gsize len)
 529 {
 530         const guint8 *ptr = buf;
 531         gsize counter;
 532
 533         while (len > 0) {
 534                 guint8 *pos;
 535                 gsize count;
 536                 char *str;
 537
 538                 switch (session->chunck_state) {
 539                 case CHUNK_SIZE:
 540                         pos = memchr(ptr, '\n', len);
 541                         if (pos == NULL) {
 542                                 g_string_append_len(session->current_header,
 543                                                 (gchar *) ptr, len);
 544                                 return 0;
 545                         }
 546
 547                         count = pos - ptr;
 548                         if (count < 1 || ptr[count - 1] != '\r')
 549                                 return -EILSEQ;
 550
 551                         g_string_append_len(session->current_header,
 552                                                 (gchar *) ptr, count);
 553
 554                         len -= count + 1;
 555                         ptr = pos + 1;
 556
 557                         str = session->current_header->str;
 558
 559                         counter = strtoul(str, NULL, 16);
 560                         if ((counter == 0 && errno == EINVAL) ||
 561                                                 counter == ULONG_MAX)
 562                                 return -EILSEQ;
 563
 564                         session->chunk_size = counter;
 565                         session->chunk_left = counter;
 566
 567                         session->chunck_state = CHUNK_DATA;
 568                         break;
 569                 case CHUNK_R_BODY:
 570                         if (*ptr != '\r')
 571                                 return -EILSEQ;
 572                         ptr++;
 573                         len--;
 574                         session->chunck_state = CHUNK_N_BODY;
 575                         break;
 576                 case CHUNK_N_BODY:
 577                         if (*ptr != '\n')
 578                                 return -EILSEQ;
 579                         ptr++;
 580                         len--;
 581                         session->chunck_state = CHUNK_SIZE;
 582                         break;
 583                 case CHUNK_DATA:
 584                         if (session->chunk_size == 0) {
 585                                 debug(session->web, "Download Done in chunk");
 586                                 g_string_truncate(session->current_header, 0);
 587                                 return 0;
 588                         }
 589
 590                         if (session->chunk_left <= len) {
 591                                 session->result.buffer = ptr;
 592                                 session->result.length = session->chunk_left;
 593                                 call_result_func(session, 0);
 594
 595                                 len -= session->chunk_left;
 596                                 ptr += session->chunk_left;
 597
 598                                 session->total_len += session->chunk_left;
 599                                 session->chunk_left = 0;
 600
 601                                 g_string_truncate(session->current_header, 0);
 602                                 session->chunck_state = CHUNK_R_BODY;
 603                                 break;
 604                         }
 605                         /* more data */
 606                         session->result.buffer = ptr;
 607                         session->result.length = len;
 608                         call_result_func(session, 0);
 609
 610                         session->chunk_left -= len;
 611                         session->total_len += len;
 612
 613                         len -= len;
 614                         ptr += len;
 615                         break;
 616                 }
 617         }
 618
 619         return 0;
 620 }
 621
 622 static int handle_body(struct web_session *session,
 623                                 const guint8 *buf, gsize len)
 624 {
 625         int err;
 626
 627         debug(session->web, "[body] length %zu", len);
 628
 629         if (session->result.use_chunk == FALSE) {
 630                 session->result.buffer = buf;
 631                 session->result.length = len;
 632                 call_result_func(session, 0);
 633                 return 0;
 634         }
 635
 636         err = decode_chunked(session, buf, len);
 637         if (err < 0) {
 638                 debug(session->web, "Error in chunk decode %d", err);
 639
 640                 session->result.buffer = NULL;
 641                 session->result.length = 0;
 642                 call_result_func(session, 400);
 643         }
 644
 645         return err;
 646 }
 647
 648 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 649                                                         gpointer user_data)
 650 {
 651         struct web_session *session = user_data;
 652         guint8 *ptr = session->receive_buffer;
 653         gsize bytes_read;
 654         GIOStatus status;
 655
 656         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 657                 session->transport_watch = 0;
 658                 session->result.buffer = NULL;
 659                 session->result.length = 0;
 660                 call_result_func(session, 400);
 661                 return FALSE;
 662         }
 663
 664         status = g_io_channel_read_chars(channel,
 665                                 (gchar *) session->receive_buffer,
 666                                 session->receive_space - 1, &bytes_read, NULL);
 667
 668         debug(session->web, "bytes read %zu", bytes_read);
 669
 670         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 671                 session->transport_watch = 0;
 672                 session->result.buffer = NULL;
 673                 session->result.length = 0;
 674                 call_result_func(session, 0);
 675                 return FALSE;
 676         }
 677
 678         session->receive_buffer[bytes_read] = '\0';
 679
 680         if (session->header_done == TRUE) {
 681                 if (handle_body(session, session->receive_buffer,
 682                                                         bytes_read) < 0) {
 683                         session->transport_watch = 0;
 684                         return FALSE;
 685                 }
 686                 return TRUE;
 687         }
 688
 689         while (bytes_read > 0) {
 690                 guint8 *pos;
 691                 gsize count;
 692                 char *str;
 693
 694                 pos = memchr(ptr, '\n', bytes_read);
 695                 if (pos == NULL) {
 696                         g_string_append_len(session->current_header,
 697                                                 (gchar *) ptr, bytes_read);
 698                         return TRUE;
 699                 }
 700
 701                 *pos = '\0';
 702                 count = strlen((char *) ptr);
 703                 if (count > 0 && ptr[count - 1] == '\r') {
 704                         ptr[--count] = '\0';
 705                         bytes_read--;
 706                 }
 707
 708                 g_string_append_len(session->current_header,
 709                                                 (gchar *) ptr, count);
 710
 711                 bytes_read -= count + 1;
 712                 if (bytes_read > 0)
 713                         ptr = pos + 1;
 714                 else
 715                         ptr = NULL;
 716
 717                 if (session->current_header->len == 0) {
 718                         session->header_done = TRUE;
 719                         if (handle_body(session, ptr, bytes_read) < 0) {
 720                                 session->transport_watch = 0;
 721                                 return FALSE;
 722                         }
 723                         break;
 724                 }
 725
 726                 str = session->current_header->str;
 727
 728                 if (session->result.status == 0) {
 729                         unsigned int code;
 730
 731                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 732                                 session->result.status = code;
 733                 } else if (session->result.use_chunk == FALSE &&
 734                                 g_ascii_strncasecmp("Transfer-Encoding:",
 735                                                                 str, 18) == 0) {
 736                         char *val;
 737
 738                         val = g_strrstr(str + 18, "chunked");
 739                         if (val != NULL) {
 740                                 session->result.use_chunk = TRUE;
 741
 742                                 session->chunck_state = CHUNK_SIZE;
 743                                 session->chunk_left = 0;
 744                                 session->chunk_left = 0;
 745                                 session->total_len = 0;
 746                         }
 747                 }
 748
 749                 debug(session->web, "[header] %s", str);
 750
 751                 g_string_truncate(session->current_header, 0);
 752         }
 753
 754         return TRUE;
 755 }
 756
 757 static int connect_session_transport(struct web_session *session)
 758 {
 759         GIOFlags flags;
 760         struct sockaddr_in sin;
 761         int sk;
 762
 763         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 764         if (sk < 0)
 765                 return -EIO;
 766
 767         if (session->flags & SESSION_FLAG_USE_TLS) {
 768                 debug(session->web, "using TLS encryption");
 769                 session->transport_channel = g_io_channel_gnutls_new(sk);
 770         } else {
 771                 debug(session->web, "no encryption");
 772                 session->transport_channel = g_io_channel_unix_new(sk);
 773         }
 774
 775         if (session->transport_channel == NULL) {
 776                 close(sk);
 777                 return -ENOMEM;
 778         }
 779
 780         flags = g_io_channel_get_flags(session->transport_channel);
 781         g_io_channel_set_flags(session->transport_channel,
 782                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 783
 784         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 785         g_io_channel_set_buffered(session->transport_channel, FALSE);
 786
 787         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 788
 789         memset(&sin, 0, sizeof(sin));
 790         sin.sin_family = AF_INET;
 791         sin.sin_port = htons(session->port);
 792         sin.sin_addr.s_addr = inet_addr(session->address);
 793
 794         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 795                 if (errno != EINPROGRESS) {
 796                         close(sk);
 797                         return -EIO;
 798                 }
 799         }
 800
 801         session->transport_watch = g_io_add_watch(session->transport_channel,
 802                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 803                                                 received_data, session);
 804
 805         session->send_watch = g_io_add_watch(session->transport_channel,
 806                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 807                                                 send_data, session);
 808
 809         return 0;
 810 }
 811
 812 static int create_transport(struct web_session *session)
 813 {
 814         int err;
 815
 816         err = connect_session_transport(session);
 817         if (err < 0)
 818                 return err;
 819
 820         debug(session->web, "creating session %s:%u",
 821                                         session->address, session->port);
 822
 823         return 0;
 824 }
 825
 826 static int parse_url(struct web_session *session, const char *url)
 827 {
 828         char *scheme, *host, *port, *path;
 829
 830         scheme = g_strdup(url);
 831         if (scheme == NULL)
 832                 return -EINVAL;
 833
 834         host = strstr(scheme, "://");
 835         if (host != NULL) {
 836                 *host = '\0';
 837                 host += 3;
 838
 839                 if (strcasecmp(scheme, "https") == 0) {
 840                         session->port = 443;
 841                         session->flags |= SESSION_FLAG_USE_TLS;
 842                 } else if (strcasecmp(scheme, "http") == 0) {
 843                         session->port = 80;
 844                 } else {
 845                         g_free(scheme);
 846                         return -EINVAL;
 847                 }
 848         } else {
 849                 host = scheme;
 850                 session->port = 80;
 851         }
 852
 853         path = strchr(host, '/');
 854         if (path != NULL)
 855                 *(path++) = '\0';
 856
 857         session->request = g_strdup_printf("/%s", path ? path : "");
 858
 859         port = strrchr(host, ':');
 860         if (port != NULL) {
 861                 char *end;
 862                 int tmp = strtol(port + 1, &end, 10);
 863
 864                 if (*end == '\0') {
 865                         *port = '\0';
 866                         session->port = tmp;
 867                 }
 868         }
 869
 870         session->host = g_strdup(host);
 871
 872         g_free(scheme);
 873
 874         return 0;
 875 }
 876
 877 static void resolv_result(GResolvResultStatus status,
 878                                         char **results, gpointer user_data)
 879 {
 880         struct web_session *session = user_data;
 881
 882         if (results == NULL || results[0] == NULL) {
 883                 call_result_func(session, 404);
 884                 return;
 885         }
 886
 887         debug(session->web, "address %s", results[0]);
 888
 889         if (inet_aton(results[0], NULL) == 0) {
 890                 call_result_func(session, 400);
 891                 return;
 892         }
 893
 894         session->address = g_strdup(results[0]);
 895
 896         if (create_transport(session) < 0) {
 897                 call_result_func(session, 409);
 898                 return;
 899         }
 900 }
 901
 902 static guint do_request(GWeb *web, const char *url,
 903                                 const char *type, GWebInputFunc input,
 904                                 GWebResultFunc func, gpointer user_data)
 905 {
 906         struct web_session *session;
 907
 908         if (web == NULL || url == NULL)
 909                 return 0;
 910
 911         debug(web, "request %s", url);
 912
 913         session = g_try_new0(struct web_session, 1);
 914         if (session == NULL)
 915                 return 0;
 916
 917         if (parse_url(session, url) < 0) {
 918                 free_session(session);
 919                 return 0;
 920         }
 921
 922         debug(web, "host %s:%u", session->host, session->port);
 923         debug(web, "flags %lu", session->flags);
 924
 925         if (type != NULL) {
 926                 session->content_type = g_strdup(type);
 927
 928                 debug(web, "content-type %s", session->content_type);
 929         }
 930
 931         session->web = web;
 932
 933         session->result_func = func;
 934         session->input_func = input;
 935         session->user_data = user_data;
 936
 937         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 938         if (session->receive_buffer == NULL) {
 939                 free_session(session);
 940                 return 0;
 941         }
 942
 943         session->receive_space = DEFAULT_BUFFER_SIZE;
 944         session->send_buffer = g_string_sized_new(0);
 945         session->current_header = g_string_sized_new(0);
 946         session->header_done = FALSE;
 947         session->body_done = FALSE;
 948
 949         if (inet_aton(session->host, NULL) == 0) {
 950                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 951                                         session->host, resolv_result, session);
 952                 if (session->resolv_action == 0) {
 953                         free_session(session);
 954                         return 0;
 955                 }
 956         } else {
 957                 session->address = g_strdup(session->host);
 958
 959                 if (create_transport(session) < 0) {
 960                         free_session(session);
 961                         return 0;
 962                 }
 963         }
 964
 965         web->session_list = g_list_append(web->session_list, session);
 966
 967         return web->next_query_id++;
 968 }
 969
 970 guint g_web_request_get(GWeb *web, const char *url,
 971                                 GWebResultFunc func, gpointer user_data)
 972 {
 973         return do_request(web, url, NULL, NULL, func, user_data);
 974 }
 975
 976 guint g_web_request_post(GWeb *web, const char *url,
 977                                 const char *type, GWebInputFunc input,
 978                                 GWebResultFunc func, gpointer user_data)
 979 {
 980         return do_request(web, url, type, input, func, user_data);
 981 }
 982
 983 gboolean g_web_cancel_request(GWeb *web, guint id)
 984 {
 985         if (web == NULL)
 986                 return FALSE;
 987
 988         return TRUE;
 989 }
 990
 991 guint16 g_web_result_get_status(GWebResult *result)
 992 {
 993         if (result == NULL)
 994                 return 0;
 995
 996         return result->status;
 997 }
 998
 999 gboolean g_web_result_get_chunk(GWebResult *result,
1000                                 const guint8 **chunk, gsize *length)
1001 {
1002         if (result == NULL)
1003                 return FALSE;
1004
1005         if (chunk == NULL)
1006                 return FALSE;
1007
1008         *chunk = result->buffer;
1009
1010         if (length != NULL)
1011                 *length = result->length;
1012
1013         return TRUE;
1014 }
1015
1016 struct _GWebParser {
1017         gint ref_count;
1018         char *begin_token;
1019         char *end_token;
1020         const char *token_str;
1021         size_t token_len;
1022         size_t token_pos;
1023         gboolean intoken;
1024         GString *content;
1025         GWebParserFunc func;
1026         gpointer user_data;
1027 };
1028
1029 GWebParser *g_web_parser_new(const char *begin, const char *end,
1030                                 GWebParserFunc func, gpointer user_data)
1031 {
1032         GWebParser *parser;
1033
1034         parser = g_try_new0(GWebParser, 1);
1035         if (parser == NULL)
1036                 return NULL;
1037
1038         parser->ref_count = 1;
1039
1040         parser->begin_token = g_strdup(begin);
1041         parser->end_token = g_strdup(end);
1042
1043         if (parser->begin_token == NULL) {
1044                 g_free(parser);
1045                 return NULL;
1046         }
1047
1048         parser->func = func;
1049         parser->user_data = user_data;
1050
1051         parser->token_str = parser->begin_token;
1052         parser->token_len = strlen(parser->token_str);
1053         parser->token_pos = 0;
1054
1055         parser->intoken = FALSE;
1056         parser->content = g_string_sized_new(0);
1057
1058         return parser;
1059 }
1060
1061 GWebParser *g_web_parser_ref(GWebParser *parser)
1062 {
1063         if (parser == NULL)
1064                 return NULL;
1065
1066         g_atomic_int_inc(&parser->ref_count);
1067
1068         return parser;
1069 }
1070
1071 void g_web_parser_unref(GWebParser *parser)
1072 {
1073         if (parser == NULL)
1074                 return;
1075
1076         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1077                 return;
1078
1079         g_string_free(parser->content, TRUE);
1080
1081         g_free(parser->begin_token);
1082         g_free(parser->end_token);
1083         g_free(parser);
1084 }
1085
1086 void g_web_parser_feed_data(GWebParser *parser,
1087                                 const guint8 *data, gsize length)
1088 {
1089         const guint8 *ptr = data;
1090
1091         if (parser == NULL)
1092                 return;
1093
1094         while (length > 0) {
1095                 guint8 chr = parser->token_str[parser->token_pos];
1096
1097                 if (parser->token_pos == 0) {
1098                         guint8 *pos;
1099
1100                         pos = memchr(ptr, chr, length);
1101                         if (pos == NULL) {
1102                                 if (parser->intoken == TRUE)
1103                                         g_string_append_len(parser->content,
1104                                                         (gchar *) ptr, length);
1105                                 break;
1106                         }
1107
1108                         if (parser->intoken == TRUE)
1109                                 g_string_append_len(parser->content,
1110                                                 (gchar *) ptr, (pos - ptr) + 1);
1111
1112                         length -= (pos - ptr) + 1;
1113                         ptr = pos + 1;
1114
1115                         parser->token_pos++;
1116                         continue;
1117                 }
1118
1119                 if (parser->intoken == TRUE)
1120                         g_string_append_c(parser->content, ptr[0]);
1121
1122                 if (ptr[0] != chr) {
1123                         length--;
1124                         ptr++;
1125
1126                         parser->token_pos = 0;
1127                         continue;
1128                 }
1129
1130                 length--;
1131                 ptr++;
1132
1133                 parser->token_pos++;
1134
1135                 if (parser->token_pos == parser->token_len) {
1136                         if (parser->intoken == FALSE) {
1137                                 g_string_append(parser->content,
1138                                                         parser->token_str);
1139
1140                                 parser->intoken = TRUE;
1141                                 parser->token_str = parser->end_token;
1142                                 parser->token_len = strlen(parser->end_token);
1143                                 parser->token_pos = 0;
1144                         } else {
1145                                 char *str;
1146                                 str = g_string_free(parser->content, FALSE);
1147                                 parser->content = g_string_sized_new(0);
1148                                 if (parser->func)
1149                                         parser->func(str, parser->user_data);
1150                                 g_free(str);
1151
1152                                 parser->intoken = FALSE;
1153                                 parser->token_str = parser->begin_token;
1154                                 parser->token_len = strlen(parser->begin_token);
1155                                 parser->token_pos = 0;
1156                         }
1157                 }
1158         }
1159 }
1160
1161 void g_web_parser_end_data(GWebParser *parser)
1162 {
1163         if (parser == NULL)
1164                 return;
1165 }