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         gchar *last_key;
  56         GHashTable *headers;
  57 };
  58
  59 struct web_session {
  60         GWeb *web;
  61
  62         char *address;
  63         char *host;
  64         uint16_t port;
  65         unsigned long flags;
  66
  67         char *content_type;
  68
  69         GIOChannel *transport_channel;
  70         guint transport_watch;
  71         guint send_watch;
  72
  73         guint resolv_action;
  74         char *request;
  75
  76         guint8 *receive_buffer;
  77         gsize receive_space;
  78         GString *send_buffer;
  79         GString *current_header;
  80         gboolean header_done;
  81         gboolean body_done;
  82         gboolean more_data;
  83         gboolean request_started;
  84
  85         enum chunk_state chunck_state;
  86         gsize chunk_size;
  87         gsize chunk_left;
  88         gsize total_len;
  89
  90         GWebResult result;
  91
  92         GWebResultFunc result_func;
  93         GWebInputFunc input_func;
  94         gpointer user_data;
  95 };
  96
  97 struct _GWeb {
  98         gint ref_count;
  99
 100         guint next_query_id;
 101
 102         int index;
 103         GList *session_list;
 104
 105         GResolv *resolv;
 106         char *proxy;
 107         char *accept_option;
 108         char *user_agent;
 109         char *http_version;
 110         gboolean close_connection;
 111
 112         GWebDebugFunc debug_func;
 113         gpointer debug_data;
 114 };
 115
 116 static inline void debug(GWeb *web, const char *format, ...)
 117 {
 118         char str[256];
 119         va_list ap;
 120
 121         if (web->debug_func == NULL)
 122                 return;
 123
 124         va_start(ap, format);
 125
 126         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 127                 web->debug_func(str, web->debug_data);
 128
 129         va_end(ap);
 130 }
 131
 132 static void free_session(struct web_session *session)
 133 {
 134         GWeb *web = session->web;
 135
 136         if (session == NULL)
 137                 return;
 138
 139         g_free(session->request);
 140
 141         if (session->resolv_action > 0)
 142                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 143
 144         if (session->transport_watch > 0)
 145                 g_source_remove(session->transport_watch);
 146
 147         if (session->send_watch > 0)
 148                 g_source_remove(session->send_watch);
 149
 150         if (session->transport_channel != NULL)
 151                 g_io_channel_unref(session->transport_channel);
 152
 153         g_free(session->result.last_key);
 154         g_hash_table_destroy(session->result.headers);
 155
 156         g_string_free(session->send_buffer, TRUE);
 157         g_string_free(session->current_header, TRUE);
 158         g_free(session->receive_buffer);
 159
 160         g_free(session->content_type);
 161
 162         g_free(session->host);
 163         g_free(session->address);
 164         g_free(session);
 165 }
 166
 167 static void flush_sessions(GWeb *web)
 168 {
 169         GList *list;
 170
 171         for (list = g_list_first(web->session_list);
 172                                         list; list = g_list_next(list))
 173                 free_session(list->data);
 174
 175         g_list_free(web->session_list);
 176         web->session_list = NULL;
 177 }
 178
 179 GWeb *g_web_new(int index)
 180 {
 181         GWeb *web;
 182
 183         if (index < 0)
 184                 return NULL;
 185
 186         web = g_try_new0(GWeb, 1);
 187         if (web == NULL)
 188                 return NULL;
 189
 190         web->ref_count = 1;
 191
 192         web->next_query_id = 1;
 193
 194         web->index = index;
 195         web->session_list = NULL;
 196
 197         web->resolv = g_resolv_new(index);
 198         if (web->resolv == NULL) {
 199                 g_free(web);
 200                 return NULL;
 201         }
 202
 203         web->accept_option = g_strdup("*/*");
 204         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 205         web->close_connection = FALSE;
 206
 207         return web;
 208 }
 209
 210 GWeb *g_web_ref(GWeb *web)
 211 {
 212         if (web == NULL)
 213                 return NULL;
 214
 215         g_atomic_int_inc(&web->ref_count);
 216
 217         return web;
 218 }
 219
 220 void g_web_unref(GWeb *web)
 221 {
 222         if (web == NULL)
 223                 return;
 224
 225         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 226                 return;
 227
 228         flush_sessions(web);
 229
 230         g_resolv_unref(web->resolv);
 231
 232         g_free(web->proxy);
 233
 234         g_free(web->accept_option);
 235         g_free(web->user_agent);
 236         g_free(web->http_version);
 237
 238         g_free(web);
 239 }
 240
 241 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 242 {
 243         if (web == NULL)
 244                 return;
 245
 246         web->debug_func = func;
 247         web->debug_data = user_data;
 248
 249         g_resolv_set_debug(web->resolv, func, user_data);
 250 }
 251
 252 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 253 {
 254         if (web == NULL)
 255                 return FALSE;
 256
 257         g_free(web->proxy);
 258         web->proxy = g_strdup(proxy);
 259
 260         return TRUE;
 261 }
 262
 263 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 264 {
 265         if (web == NULL)
 266                 return FALSE;
 267
 268         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 269
 270         return TRUE;
 271 }
 272
 273 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 274 {
 275         g_free(web->accept_option);
 276
 277         if (format == NULL) {
 278                 web->accept_option = NULL;
 279                 debug(web, "clearing accept option");
 280         } else {
 281                 web->accept_option = g_strdup_vprintf(format, args);
 282                 debug(web, "setting accept %s", web->accept_option);
 283         }
 284
 285         return TRUE;
 286 }
 287
 288 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 289 {
 290         va_list args;
 291         gboolean result;
 292
 293         if (web == NULL)
 294                 return FALSE;
 295
 296         va_start(args, format);
 297         result = set_accept_option(web, format, args);
 298         va_end(args);
 299
 300         return result;
 301 }
 302
 303 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 304 {
 305         g_free(web->user_agent);
 306
 307         if (format == NULL) {
 308                 web->user_agent = NULL;
 309                 debug(web, "clearing user agent");
 310         } else {
 311                 web->user_agent = g_strdup_vprintf(format, args);
 312                 debug(web, "setting user agent %s", web->user_agent);
 313         }
 314
 315         return TRUE;
 316 }
 317
 318 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 319 {
 320         va_list args;
 321         gboolean result;
 322
 323         if (web == NULL)
 324                 return FALSE;
 325
 326         va_start(args, format);
 327         result = set_user_agent(web, format, args);
 328         va_end(args);
 329
 330         return result;
 331 }
 332
 333 gboolean g_web_set_http_version(GWeb *web, const char *version)
 334 {
 335         if (web == NULL)
 336                 return FALSE;
 337
 338         g_free(web->http_version);
 339
 340         if (version == NULL) {
 341                 web->http_version = NULL;
 342                 debug(web, "clearing HTTP version");
 343         } else {
 344                 web->http_version = g_strdup(version);
 345                 debug(web, "setting HTTP version %s", web->http_version);
 346         }
 347
 348         return TRUE;
 349 }
 350
 351 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 352 {
 353         if (web == NULL)
 354                 return;
 355
 356         web->close_connection = enabled;
 357 }
 358
 359 gboolean g_web_get_close_connection(GWeb *web)
 360 {
 361         if (web == NULL)
 362                 return FALSE;
 363
 364         return web->close_connection;
 365 }
 366
 367 static inline void call_result_func(struct web_session *session, guint16 status)
 368 {
 369         gboolean result;
 370
 371         if (session->result_func == NULL)
 372                 return;
 373
 374         if (status != 0)
 375                 session->result.status = status;
 376
 377         result = session->result_func(&session->result, session->user_data);
 378
 379         debug(session->web, "[result function] %s",
 380                                         result == TRUE ? "continue" : "stop");
 381 }
 382
 383 static gboolean process_send_buffer(struct web_session *session)
 384 {
 385         GString *buf = session->send_buffer;
 386         gsize count, bytes_written;
 387         GIOStatus status;
 388
 389         count = buf->len;
 390
 391         if (count == 0) {
 392                 if (session->request_started == TRUE &&
 393                                         session->more_data == FALSE)
 394                         session->body_done = TRUE;
 395
 396                 return FALSE;
 397         }
 398
 399         debug(session->web, "bytes to write %zu", count);
 400
 401         status = g_io_channel_write_chars(session->transport_channel,
 402                                         buf->str, count, &bytes_written, NULL);
 403
 404         debug(session->web, "status %u bytes written %zu",
 405                                         status, bytes_written);
 406
 407         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 408                 return FALSE;
 409
 410         g_string_erase(buf, 0, bytes_written);
 411
 412         return TRUE;
 413 }
 414
 415 static void process_next_chunk(struct web_session *session)
 416 {
 417         GString *buf = session->send_buffer;
 418         const guint8 *body;
 419         gsize length;
 420
 421         if (session->input_func == NULL) {
 422                 session->more_data = FALSE;
 423                 return;
 424         }
 425
 426         session->more_data = session->input_func(&body, &length,
 427                                                 session->user_data);
 428
 429         if (length > 0) {
 430                 g_string_append_printf(buf, "%zx\r\n", length);
 431                 g_string_append_len(buf, (char *) body, length);
 432                 g_string_append(buf, "\r\n");
 433         }
 434
 435         if (session->more_data == FALSE)
 436                 g_string_append(buf, "0\r\n\r\n");
 437 }
 438
 439 static void start_request(struct web_session *session)
 440 {
 441         GString *buf = session->send_buffer;
 442         const char *version;
 443         const guint8 *body;
 444         gsize length;
 445
 446         debug(session->web, "request %s from %s",
 447                                         session->request, session->host);
 448
 449         g_string_truncate(buf, 0);
 450
 451         if (session->web->http_version == NULL)
 452                 version = "1.1";
 453         else
 454                 version = session->web->http_version;
 455
 456         if (session->content_type == NULL)
 457                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 458                                                 session->request, version);
 459         else
 460                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 461                                                 session->request, version);
 462
 463         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 464
 465         if (session->web->user_agent != NULL)
 466                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 467                                                 session->web->user_agent);
 468
 469         if (session->web->accept_option != NULL)
 470                 g_string_append_printf(buf, "Accept: %s\r\n",
 471                                                 session->web->accept_option);
 472
 473         if (session->content_type != NULL) {
 474                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 475                                                         session->content_type);
 476                 if (session->input_func == NULL) {
 477                         session->more_data = FALSE;
 478                         length = 0;
 479                 } else
 480                         session->more_data = session->input_func(&body, &length,
 481                                                         session->user_data);
 482                 if (session->more_data == FALSE)
 483                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 484                                                                         length);
 485                 else
 486                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 487         }
 488
 489         if (session->web->close_connection == TRUE)
 490                 g_string_append(buf, "Connection: close\r\n");
 491
 492         g_string_append(buf, "\r\n");
 493
 494         if (session->content_type != NULL && length > 0) {
 495                 if (session->more_data == TRUE) {
 496                         g_string_append_printf(buf, "%zx\r\n", length);
 497                         g_string_append_len(buf, (char *) body, length);
 498                         g_string_append(buf, "\r\n");
 499                 } else
 500                         g_string_append_len(buf, (char *) body, length);
 501         }
 502 }
 503
 504 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 505                                                 gpointer user_data)
 506 {
 507         struct web_session *session = user_data;
 508
 509         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 510                 session->send_watch = 0;
 511                 return FALSE;
 512         }
 513
 514         if (process_send_buffer(session) == TRUE)
 515                 return TRUE;
 516
 517         if (session->request_started == FALSE) {
 518                 session->request_started = TRUE;
 519                 start_request(session);
 520         } else if (session->more_data == TRUE)
 521                 process_next_chunk(session);
 522
 523         process_send_buffer(session);
 524
 525         if (session->body_done == TRUE) {
 526                 session->send_watch = 0;
 527                 return FALSE;
 528         }
 529
 530         return TRUE;
 531 }
 532
 533 static int decode_chunked(struct web_session *session,
 534                                         const guint8 *buf, gsize len)
 535 {
 536         const guint8 *ptr = buf;
 537         gsize counter;
 538
 539         while (len > 0) {
 540                 guint8 *pos;
 541                 gsize count;
 542                 char *str;
 543
 544                 switch (session->chunck_state) {
 545                 case CHUNK_SIZE:
 546                         pos = memchr(ptr, '\n', len);
 547                         if (pos == NULL) {
 548                                 g_string_append_len(session->current_header,
 549                                                 (gchar *) ptr, len);
 550                                 return 0;
 551                         }
 552
 553                         count = pos - ptr;
 554                         if (count < 1 || ptr[count - 1] != '\r')
 555                                 return -EILSEQ;
 556
 557                         g_string_append_len(session->current_header,
 558                                                 (gchar *) ptr, count);
 559
 560                         len -= count + 1;
 561                         ptr = pos + 1;
 562
 563                         str = session->current_header->str;
 564
 565                         counter = strtoul(str, NULL, 16);
 566                         if ((counter == 0 && errno == EINVAL) ||
 567                                                 counter == ULONG_MAX)
 568                                 return -EILSEQ;
 569
 570                         session->chunk_size = counter;
 571                         session->chunk_left = counter;
 572
 573                         session->chunck_state = CHUNK_DATA;
 574                         break;
 575                 case CHUNK_R_BODY:
 576                         if (*ptr != '\r')
 577                                 return -EILSEQ;
 578                         ptr++;
 579                         len--;
 580                         session->chunck_state = CHUNK_N_BODY;
 581                         break;
 582                 case CHUNK_N_BODY:
 583                         if (*ptr != '\n')
 584                                 return -EILSEQ;
 585                         ptr++;
 586                         len--;
 587                         session->chunck_state = CHUNK_SIZE;
 588                         break;
 589                 case CHUNK_DATA:
 590                         if (session->chunk_size == 0) {
 591                                 debug(session->web, "Download Done in chunk");
 592                                 g_string_truncate(session->current_header, 0);
 593                                 return 0;
 594                         }
 595
 596                         if (session->chunk_left <= len) {
 597                                 session->result.buffer = ptr;
 598                                 session->result.length = session->chunk_left;
 599                                 call_result_func(session, 0);
 600
 601                                 len -= session->chunk_left;
 602                                 ptr += session->chunk_left;
 603
 604                                 session->total_len += session->chunk_left;
 605                                 session->chunk_left = 0;
 606
 607                                 g_string_truncate(session->current_header, 0);
 608                                 session->chunck_state = CHUNK_R_BODY;
 609                                 break;
 610                         }
 611                         /* more data */
 612                         session->result.buffer = ptr;
 613                         session->result.length = len;
 614                         call_result_func(session, 0);
 615
 616                         session->chunk_left -= len;
 617                         session->total_len += len;
 618
 619                         len -= len;
 620                         ptr += len;
 621                         break;
 622                 }
 623         }
 624
 625         return 0;
 626 }
 627
 628 static int handle_body(struct web_session *session,
 629                                 const guint8 *buf, gsize len)
 630 {
 631         int err;
 632
 633         debug(session->web, "[body] length %zu", len);
 634
 635         if (session->result.use_chunk == FALSE) {
 636                 if (len > 0) {
 637                         session->result.buffer = buf;
 638                         session->result.length = len;
 639                         call_result_func(session, 0);
 640                 }
 641                 return 0;
 642         }
 643
 644         err = decode_chunked(session, buf, len);
 645         if (err < 0) {
 646                 debug(session->web, "Error in chunk decode %d", err);
 647
 648                 session->result.buffer = NULL;
 649                 session->result.length = 0;
 650                 call_result_func(session, 400);
 651         }
 652
 653         return err;
 654 }
 655
 656 static void handle_multi_line(struct web_session *session)
 657 {
 658         gsize count;
 659         char *str;
 660         gchar *value;
 661
 662         str = session->current_header->str;
 663
 664         if (str[0] != ' ' && str[0] != '\t')
 665                 return;
 666
 667         while (str[0] == ' ' || str[0] == '\t')
 668                 str++;
 669
 670         count = str - session->current_header->str;
 671         if (count > 0) {
 672                 g_string_erase(session->current_header, 0, count);
 673                 g_string_insert_c(session->current_header, 0, ' ');
 674         }
 675
 676         value = g_hash_table_lookup(session->result.headers,
 677                                         session->result.last_key);
 678         if (value != NULL) {
 679                 g_string_insert(session->current_header, 0, value);
 680
 681                 str = session->current_header->str;
 682
 683                 g_hash_table_replace(session->result.headers,
 684                                         g_strdup(session->result.last_key),
 685                                         g_strdup(str));
 686         }
 687 }
 688
 689 static void add_header_field(struct web_session *session)
 690 {
 691         gsize count;
 692         guint8 *pos;
 693         char *str;
 694         gchar *value;
 695         gchar *key;
 696
 697         str = session->current_header->str;
 698
 699         pos = memchr(str, ':', session->current_header->len);
 700         if (pos != NULL) {
 701                 *pos = '\0';
 702                 pos++;
 703
 704                 key = g_strdup(str);
 705
 706                 /* remove preceding white spaces */
 707                 while (*pos == ' ')
 708                         pos++;
 709
 710                 count = (char *) pos - str;
 711
 712                 g_string_erase(session->current_header, 0, count);
 713
 714                 value = g_hash_table_lookup(session->result.headers, key);
 715                 if (value != NULL) {
 716                         g_string_insert_c(session->current_header, 0, ' ');
 717                         g_string_insert_c(session->current_header, 0, ';');
 718
 719                         g_string_insert(session->current_header, 0, value);
 720                 }
 721
 722                 str = session->current_header->str;
 723                 g_hash_table_replace(session->result.headers, key,
 724                                                         g_strdup(str));
 725
 726                 g_free(session->result.last_key);
 727                 session->result.last_key = g_strdup(key);
 728         }
 729 }
 730
 731 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 732                                                         gpointer user_data)
 733 {
 734         struct web_session *session = user_data;
 735         guint8 *ptr = session->receive_buffer;
 736         gsize bytes_read;
 737         GIOStatus status;
 738
 739         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 740                 session->transport_watch = 0;
 741                 session->result.buffer = NULL;
 742                 session->result.length = 0;
 743                 call_result_func(session, 400);
 744                 return FALSE;
 745         }
 746
 747         status = g_io_channel_read_chars(channel,
 748                                 (gchar *) session->receive_buffer,
 749                                 session->receive_space - 1, &bytes_read, NULL);
 750
 751         debug(session->web, "bytes read %zu", bytes_read);
 752
 753         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 754                 session->transport_watch = 0;
 755                 session->result.buffer = NULL;
 756                 session->result.length = 0;
 757                 call_result_func(session, 0);
 758                 return FALSE;
 759         }
 760
 761         session->receive_buffer[bytes_read] = '\0';
 762
 763         if (session->header_done == TRUE) {
 764                 if (handle_body(session, session->receive_buffer,
 765                                                         bytes_read) < 0) {
 766                         session->transport_watch = 0;
 767                         return FALSE;
 768                 }
 769                 return TRUE;
 770         }
 771
 772         while (bytes_read > 0) {
 773                 guint8 *pos;
 774                 gsize count;
 775                 char *str;
 776
 777                 pos = memchr(ptr, '\n', bytes_read);
 778                 if (pos == NULL) {
 779                         g_string_append_len(session->current_header,
 780                                                 (gchar *) ptr, bytes_read);
 781                         return TRUE;
 782                 }
 783
 784                 *pos = '\0';
 785                 count = strlen((char *) ptr);
 786                 if (count > 0 && ptr[count - 1] == '\r') {
 787                         ptr[--count] = '\0';
 788                         bytes_read--;
 789                 }
 790
 791                 g_string_append_len(session->current_header,
 792                                                 (gchar *) ptr, count);
 793
 794                 bytes_read -= count + 1;
 795                 if (bytes_read > 0)
 796                         ptr = pos + 1;
 797                 else
 798                         ptr = NULL;
 799
 800                 if (session->current_header->len == 0) {
 801                         char *val;
 802
 803                         session->header_done = TRUE;
 804
 805                         val = g_hash_table_lookup(session->result.headers,
 806                                                         "Transfer-Encoding");
 807                         if (val != NULL) {
 808                                 val = g_strrstr(val, "chunked");
 809                                 if (val != NULL) {
 810                                         session->result.use_chunk = TRUE;
 811
 812                                         session->chunck_state = CHUNK_SIZE;
 813                                         session->chunk_left = 0;
 814                                         session->total_len = 0;
 815                                 }
 816                         }
 817
 818                         if (handle_body(session, ptr, bytes_read) < 0) {
 819                                 session->transport_watch = 0;
 820                                 return FALSE;
 821                         }
 822                         break;
 823                 }
 824
 825                 str = session->current_header->str;
 826
 827                 if (session->result.status == 0) {
 828                         unsigned int code;
 829
 830                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 831                                 session->result.status = code;
 832                 }
 833
 834                 debug(session->web, "[header] %s", str);
 835
 836                 /* handle multi-line header */
 837                 if (str[0] == ' ' || str[0] == '\t')
 838                         handle_multi_line(session);
 839                 else
 840                         add_header_field(session);
 841
 842                 g_string_truncate(session->current_header, 0);
 843         }
 844
 845         return TRUE;
 846 }
 847
 848 static int connect_session_transport(struct web_session *session)
 849 {
 850         GIOFlags flags;
 851         struct sockaddr_in sin;
 852         int sk;
 853
 854         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 855         if (sk < 0)
 856                 return -EIO;
 857
 858         if (session->flags & SESSION_FLAG_USE_TLS) {
 859                 debug(session->web, "using TLS encryption");
 860                 session->transport_channel = g_io_channel_gnutls_new(sk);
 861         } else {
 862                 debug(session->web, "no encryption");
 863                 session->transport_channel = g_io_channel_unix_new(sk);
 864         }
 865
 866         if (session->transport_channel == NULL) {
 867                 close(sk);
 868                 return -ENOMEM;
 869         }
 870
 871         flags = g_io_channel_get_flags(session->transport_channel);
 872         g_io_channel_set_flags(session->transport_channel,
 873                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 874
 875         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 876         g_io_channel_set_buffered(session->transport_channel, FALSE);
 877
 878         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 879
 880         memset(&sin, 0, sizeof(sin));
 881         sin.sin_family = AF_INET;
 882         sin.sin_port = htons(session->port);
 883         sin.sin_addr.s_addr = inet_addr(session->address);
 884
 885         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 886                 if (errno != EINPROGRESS) {
 887                         close(sk);
 888                         return -EIO;
 889                 }
 890         }
 891
 892         session->transport_watch = g_io_add_watch(session->transport_channel,
 893                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 894                                                 received_data, session);
 895
 896         session->send_watch = g_io_add_watch(session->transport_channel,
 897                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 898                                                 send_data, session);
 899
 900         return 0;
 901 }
 902
 903 static int create_transport(struct web_session *session)
 904 {
 905         int err;
 906
 907         err = connect_session_transport(session);
 908         if (err < 0)
 909                 return err;
 910
 911         debug(session->web, "creating session %s:%u",
 912                                         session->address, session->port);
 913
 914         return 0;
 915 }
 916
 917 static int parse_url(struct web_session *session, const char *url)
 918 {
 919         char *scheme, *host, *port, *path;
 920
 921         scheme = g_strdup(url);
 922         if (scheme == NULL)
 923                 return -EINVAL;
 924
 925         host = strstr(scheme, "://");
 926         if (host != NULL) {
 927                 *host = '\0';
 928                 host += 3;
 929
 930                 if (strcasecmp(scheme, "https") == 0) {
 931                         session->port = 443;
 932                         session->flags |= SESSION_FLAG_USE_TLS;
 933                 } else if (strcasecmp(scheme, "http") == 0) {
 934                         session->port = 80;
 935                 } else {
 936                         g_free(scheme);
 937                         return -EINVAL;
 938                 }
 939         } else {
 940                 host = scheme;
 941                 session->port = 80;
 942         }
 943
 944         path = strchr(host, '/');
 945         if (path != NULL)
 946                 *(path++) = '\0';
 947
 948         session->request = g_strdup_printf("/%s", path ? path : "");
 949
 950         port = strrchr(host, ':');
 951         if (port != NULL) {
 952                 char *end;
 953                 int tmp = strtol(port + 1, &end, 10);
 954
 955                 if (*end == '\0') {
 956                         *port = '\0';
 957                         session->port = tmp;
 958                 }
 959         }
 960
 961         session->host = g_strdup(host);
 962
 963         g_free(scheme);
 964
 965         return 0;
 966 }
 967
 968 static void resolv_result(GResolvResultStatus status,
 969                                         char **results, gpointer user_data)
 970 {
 971         struct web_session *session = user_data;
 972
 973         if (results == NULL || results[0] == NULL) {
 974                 call_result_func(session, 404);
 975                 return;
 976         }
 977
 978         debug(session->web, "address %s", results[0]);
 979
 980         if (inet_aton(results[0], NULL) == 0) {
 981                 call_result_func(session, 400);
 982                 return;
 983         }
 984
 985         session->address = g_strdup(results[0]);
 986
 987         if (create_transport(session) < 0) {
 988                 call_result_func(session, 409);
 989                 return;
 990         }
 991 }
 992
 993 static guint do_request(GWeb *web, const char *url,
 994                                 const char *type, GWebInputFunc input,
 995                                 GWebResultFunc func, gpointer user_data)
 996 {
 997         struct web_session *session;
 998
 999         if (web == NULL || url == NULL)
1000                 return 0;
1001
1002         debug(web, "request %s", url);
1003
1004         session = g_try_new0(struct web_session, 1);
1005         if (session == NULL)
1006                 return 0;
1007
1008         if (parse_url(session, url) < 0) {
1009                 free_session(session);
1010                 return 0;
1011         }
1012
1013         debug(web, "host %s:%u", session->host, session->port);
1014         debug(web, "flags %lu", session->flags);
1015
1016         if (type != NULL) {
1017                 session->content_type = g_strdup(type);
1018
1019                 debug(web, "content-type %s", session->content_type);
1020         }
1021
1022         session->web = web;
1023
1024         session->result_func = func;
1025         session->input_func = input;
1026         session->user_data = user_data;
1027
1028         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1029         if (session->receive_buffer == NULL) {
1030                 free_session(session);
1031                 return 0;
1032         }
1033
1034         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1035                                                         g_free, g_free);
1036         if (session->result.headers == NULL) {
1037                 free_session(session);
1038                 return 0;
1039         }
1040
1041         session->receive_space = DEFAULT_BUFFER_SIZE;
1042         session->send_buffer = g_string_sized_new(0);
1043         session->current_header = g_string_sized_new(0);
1044         session->header_done = FALSE;
1045         session->body_done = FALSE;
1046
1047         if (inet_aton(session->host, NULL) == 0) {
1048                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1049                                         session->host, resolv_result, session);
1050                 if (session->resolv_action == 0) {
1051                         free_session(session);
1052                         return 0;
1053                 }
1054         } else {
1055                 session->address = g_strdup(session->host);
1056
1057                 if (create_transport(session) < 0) {
1058                         free_session(session);
1059                         return 0;
1060                 }
1061         }
1062
1063         web->session_list = g_list_append(web->session_list, session);
1064
1065         return web->next_query_id++;
1066 }
1067
1068 guint g_web_request_get(GWeb *web, const char *url,
1069                                 GWebResultFunc func, gpointer user_data)
1070 {
1071         return do_request(web, url, NULL, NULL, func, user_data);
1072 }
1073
1074 guint g_web_request_post(GWeb *web, const char *url,
1075                                 const char *type, GWebInputFunc input,
1076                                 GWebResultFunc func, gpointer user_data)
1077 {
1078         return do_request(web, url, type, input, func, user_data);
1079 }
1080
1081 gboolean g_web_cancel_request(GWeb *web, guint id)
1082 {
1083         if (web == NULL)
1084                 return FALSE;
1085
1086         return TRUE;
1087 }
1088
1089 guint16 g_web_result_get_status(GWebResult *result)
1090 {
1091         if (result == NULL)
1092                 return 0;
1093
1094         return result->status;
1095 }
1096
1097 gboolean g_web_result_get_chunk(GWebResult *result,
1098                                 const guint8 **chunk, gsize *length)
1099 {
1100         if (result == NULL)
1101                 return FALSE;
1102
1103         if (chunk == NULL)
1104                 return FALSE;
1105
1106         *chunk = result->buffer;
1107
1108         if (length != NULL)
1109                 *length = result->length;
1110
1111         return TRUE;
1112 }
1113
1114 gboolean g_web_result_get_header(GWebResult *result,
1115                                 const char *header, const char **value)
1116 {
1117         if (result == NULL)
1118                 return FALSE;
1119
1120         if (value == NULL)
1121                 return FALSE;
1122
1123         *value = g_hash_table_lookup(result->headers, header);
1124
1125         if (*value == NULL)
1126                 return FALSE;
1127
1128         return TRUE;
1129 }
1130
1131 struct _GWebParser {
1132         gint ref_count;
1133         char *begin_token;
1134         char *end_token;
1135         const char *token_str;
1136         size_t token_len;
1137         size_t token_pos;
1138         gboolean intoken;
1139         GString *content;
1140         GWebParserFunc func;
1141         gpointer user_data;
1142 };
1143
1144 GWebParser *g_web_parser_new(const char *begin, const char *end,
1145                                 GWebParserFunc func, gpointer user_data)
1146 {
1147         GWebParser *parser;
1148
1149         parser = g_try_new0(GWebParser, 1);
1150         if (parser == NULL)
1151                 return NULL;
1152
1153         parser->ref_count = 1;
1154
1155         parser->begin_token = g_strdup(begin);
1156         parser->end_token = g_strdup(end);
1157
1158         if (parser->begin_token == NULL) {
1159                 g_free(parser);
1160                 return NULL;
1161         }
1162
1163         parser->func = func;
1164         parser->user_data = user_data;
1165
1166         parser->token_str = parser->begin_token;
1167         parser->token_len = strlen(parser->token_str);
1168         parser->token_pos = 0;
1169
1170         parser->intoken = FALSE;
1171         parser->content = g_string_sized_new(0);
1172
1173         return parser;
1174 }
1175
1176 GWebParser *g_web_parser_ref(GWebParser *parser)
1177 {
1178         if (parser == NULL)
1179                 return NULL;
1180
1181         g_atomic_int_inc(&parser->ref_count);
1182
1183         return parser;
1184 }
1185
1186 void g_web_parser_unref(GWebParser *parser)
1187 {
1188         if (parser == NULL)
1189                 return;
1190
1191         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1192                 return;
1193
1194         g_string_free(parser->content, TRUE);
1195
1196         g_free(parser->begin_token);
1197         g_free(parser->end_token);
1198         g_free(parser);
1199 }
1200
1201 void g_web_parser_feed_data(GWebParser *parser,
1202                                 const guint8 *data, gsize length)
1203 {
1204         const guint8 *ptr = data;
1205
1206         if (parser == NULL)
1207                 return;
1208
1209         while (length > 0) {
1210                 guint8 chr = parser->token_str[parser->token_pos];
1211
1212                 if (parser->token_pos == 0) {
1213                         guint8 *pos;
1214
1215                         pos = memchr(ptr, chr, length);
1216                         if (pos == NULL) {
1217                                 if (parser->intoken == TRUE)
1218                                         g_string_append_len(parser->content,
1219                                                         (gchar *) ptr, length);
1220                                 break;
1221                         }
1222
1223                         if (parser->intoken == TRUE)
1224                                 g_string_append_len(parser->content,
1225                                                 (gchar *) ptr, (pos - ptr) + 1);
1226
1227                         length -= (pos - ptr) + 1;
1228                         ptr = pos + 1;
1229
1230                         parser->token_pos++;
1231                         continue;
1232                 }
1233
1234                 if (parser->intoken == TRUE)
1235                         g_string_append_c(parser->content, ptr[0]);
1236
1237                 if (ptr[0] != chr) {
1238                         length--;
1239                         ptr++;
1240
1241                         parser->token_pos = 0;
1242                         continue;
1243                 }
1244
1245                 length--;
1246                 ptr++;
1247
1248                 parser->token_pos++;
1249
1250                 if (parser->token_pos == parser->token_len) {
1251                         if (parser->intoken == FALSE) {
1252                                 g_string_append(parser->content,
1253                                                         parser->token_str);
1254
1255                                 parser->intoken = TRUE;
1256                                 parser->token_str = parser->end_token;
1257                                 parser->token_len = strlen(parser->end_token);
1258                                 parser->token_pos = 0;
1259                         } else {
1260                                 char *str;
1261                                 str = g_string_free(parser->content, FALSE);
1262                                 parser->content = g_string_sized_new(0);
1263                                 if (parser->func)
1264                                         parser->func(str, parser->user_data);
1265                                 g_free(str);
1266
1267                                 parser->intoken = FALSE;
1268                                 parser->token_str = parser->begin_token;
1269                                 parser->token_len = strlen(parser->begin_token);
1270                                 parser->token_pos = 0;
1271                         }
1272                 }
1273         }
1274 }
1275
1276 void g_web_parser_end_data(GWebParser *parser)
1277 {
1278         if (parser == NULL)
1279                 return;
1280 }