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
 155         if (session->result.headers != NULL)
 156                 g_hash_table_destroy(session->result.headers);
 157
 158         if (session->send_buffer != NULL)
 159                 g_string_free(session->send_buffer, TRUE);
 160
 161         if (session->current_header != NULL)
 162                 g_string_free(session->current_header, TRUE);
 163
 164         g_free(session->receive_buffer);
 165
 166         g_free(session->content_type);
 167
 168         g_free(session->host);
 169         g_free(session->address);
 170         g_free(session);
 171 }
 172
 173 static void flush_sessions(GWeb *web)
 174 {
 175         GList *list;
 176
 177         for (list = g_list_first(web->session_list);
 178                                         list; list = g_list_next(list))
 179                 free_session(list->data);
 180
 181         g_list_free(web->session_list);
 182         web->session_list = NULL;
 183 }
 184
 185 GWeb *g_web_new(int index)
 186 {
 187         GWeb *web;
 188
 189         if (index < 0)
 190                 return NULL;
 191
 192         web = g_try_new0(GWeb, 1);
 193         if (web == NULL)
 194                 return NULL;
 195
 196         web->ref_count = 1;
 197
 198         web->next_query_id = 1;
 199
 200         web->index = index;
 201         web->session_list = NULL;
 202
 203         web->resolv = g_resolv_new(index);
 204         if (web->resolv == NULL) {
 205                 g_free(web);
 206                 return NULL;
 207         }
 208
 209         web->accept_option = g_strdup("*/*");
 210         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 211         web->close_connection = FALSE;
 212
 213         return web;
 214 }
 215
 216 GWeb *g_web_ref(GWeb *web)
 217 {
 218         if (web == NULL)
 219                 return NULL;
 220
 221         g_atomic_int_inc(&web->ref_count);
 222
 223         return web;
 224 }
 225
 226 void g_web_unref(GWeb *web)
 227 {
 228         if (web == NULL)
 229                 return;
 230
 231         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 232                 return;
 233
 234         flush_sessions(web);
 235
 236         g_resolv_unref(web->resolv);
 237
 238         g_free(web->proxy);
 239
 240         g_free(web->accept_option);
 241         g_free(web->user_agent);
 242         g_free(web->http_version);
 243
 244         g_free(web);
 245 }
 246
 247 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 248 {
 249         if (web == NULL)
 250                 return;
 251
 252         web->debug_func = func;
 253         web->debug_data = user_data;
 254
 255         g_resolv_set_debug(web->resolv, func, user_data);
 256 }
 257
 258 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 259 {
 260         if (web == NULL)
 261                 return FALSE;
 262
 263         g_free(web->proxy);
 264
 265         if (proxy == NULL) {
 266                 web->proxy = NULL;
 267                 debug(web, "clearing proxy");
 268         } else {
 269                 web->proxy = g_strdup(proxy);
 270                 debug(web, "setting proxy %s", web->proxy);
 271         }
 272
 273         return TRUE;
 274 }
 275
 276 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 277 {
 278         if (web == NULL)
 279                 return FALSE;
 280
 281         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 282
 283         return TRUE;
 284 }
 285
 286 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 287 {
 288         g_free(web->accept_option);
 289
 290         if (format == NULL) {
 291                 web->accept_option = NULL;
 292                 debug(web, "clearing accept option");
 293         } else {
 294                 web->accept_option = g_strdup_vprintf(format, args);
 295                 debug(web, "setting accept %s", web->accept_option);
 296         }
 297
 298         return TRUE;
 299 }
 300
 301 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 302 {
 303         va_list args;
 304         gboolean result;
 305
 306         if (web == NULL)
 307                 return FALSE;
 308
 309         va_start(args, format);
 310         result = set_accept_option(web, format, args);
 311         va_end(args);
 312
 313         return result;
 314 }
 315
 316 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 317 {
 318         g_free(web->user_agent);
 319
 320         if (format == NULL) {
 321                 web->user_agent = NULL;
 322                 debug(web, "clearing user agent");
 323         } else {
 324                 web->user_agent = g_strdup_vprintf(format, args);
 325                 debug(web, "setting user agent %s", web->user_agent);
 326         }
 327
 328         return TRUE;
 329 }
 330
 331 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 332 {
 333         va_list args;
 334         gboolean result;
 335
 336         if (web == NULL)
 337                 return FALSE;
 338
 339         va_start(args, format);
 340         result = set_user_agent(web, format, args);
 341         va_end(args);
 342
 343         return result;
 344 }
 345
 346 gboolean g_web_set_http_version(GWeb *web, const char *version)
 347 {
 348         if (web == NULL)
 349                 return FALSE;
 350
 351         g_free(web->http_version);
 352
 353         if (version == NULL) {
 354                 web->http_version = NULL;
 355                 debug(web, "clearing HTTP version");
 356         } else {
 357                 web->http_version = g_strdup(version);
 358                 debug(web, "setting HTTP version %s", web->http_version);
 359         }
 360
 361         return TRUE;
 362 }
 363
 364 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 365 {
 366         if (web == NULL)
 367                 return;
 368
 369         web->close_connection = enabled;
 370 }
 371
 372 gboolean g_web_get_close_connection(GWeb *web)
 373 {
 374         if (web == NULL)
 375                 return FALSE;
 376
 377         return web->close_connection;
 378 }
 379
 380 static inline void call_result_func(struct web_session *session, guint16 status)
 381 {
 382         gboolean result;
 383
 384         if (session->result_func == NULL)
 385                 return;
 386
 387         if (status != 0)
 388                 session->result.status = status;
 389
 390         result = session->result_func(&session->result, session->user_data);
 391
 392         debug(session->web, "[result function] %s",
 393                                         result == TRUE ? "continue" : "stop");
 394 }
 395
 396 static gboolean process_send_buffer(struct web_session *session)
 397 {
 398         GString *buf = session->send_buffer;
 399         gsize count, bytes_written;
 400         GIOStatus status;
 401
 402         count = buf->len;
 403
 404         if (count == 0) {
 405                 if (session->request_started == TRUE &&
 406                                         session->more_data == FALSE)
 407                         session->body_done = TRUE;
 408
 409                 return FALSE;
 410         }
 411
 412         debug(session->web, "bytes to write %zu", count);
 413
 414         status = g_io_channel_write_chars(session->transport_channel,
 415                                         buf->str, count, &bytes_written, NULL);
 416
 417         debug(session->web, "status %u bytes written %zu",
 418                                         status, bytes_written);
 419
 420         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 421                 return FALSE;
 422
 423         g_string_erase(buf, 0, bytes_written);
 424
 425         return TRUE;
 426 }
 427
 428 static void process_next_chunk(struct web_session *session)
 429 {
 430         GString *buf = session->send_buffer;
 431         const guint8 *body;
 432         gsize length;
 433
 434         if (session->input_func == NULL) {
 435                 session->more_data = FALSE;
 436                 return;
 437         }
 438
 439         session->more_data = session->input_func(&body, &length,
 440                                                 session->user_data);
 441
 442         if (length > 0) {
 443                 g_string_append_printf(buf, "%zx\r\n", length);
 444                 g_string_append_len(buf, (char *) body, length);
 445                 g_string_append(buf, "\r\n");
 446         }
 447
 448         if (session->more_data == FALSE)
 449                 g_string_append(buf, "0\r\n\r\n");
 450 }
 451
 452 static void start_request(struct web_session *session)
 453 {
 454         GString *buf = session->send_buffer;
 455         const char *version;
 456         const guint8 *body;
 457         gsize length;
 458
 459         debug(session->web, "request %s from %s",
 460                                         session->request, session->host);
 461
 462         g_string_truncate(buf, 0);
 463
 464         if (session->web->http_version == NULL)
 465                 version = "1.1";
 466         else
 467                 version = session->web->http_version;
 468
 469         if (session->content_type == NULL)
 470                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 471                                                 session->request, version);
 472         else
 473                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 474                                                 session->request, version);
 475
 476         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 477
 478         if (session->web->user_agent != NULL)
 479                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 480                                                 session->web->user_agent);
 481
 482         if (session->web->accept_option != NULL)
 483                 g_string_append_printf(buf, "Accept: %s\r\n",
 484                                                 session->web->accept_option);
 485
 486         if (session->content_type != NULL) {
 487                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 488                                                         session->content_type);
 489                 if (session->input_func == NULL) {
 490                         session->more_data = FALSE;
 491                         length = 0;
 492                 } else
 493                         session->more_data = session->input_func(&body, &length,
 494                                                         session->user_data);
 495                 if (session->more_data == FALSE)
 496                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 497                                                                         length);
 498                 else
 499                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 500         }
 501
 502         if (session->web->close_connection == TRUE)
 503                 g_string_append(buf, "Connection: close\r\n");
 504
 505         g_string_append(buf, "\r\n");
 506
 507         if (session->content_type != NULL && length > 0) {
 508                 if (session->more_data == TRUE) {
 509                         g_string_append_printf(buf, "%zx\r\n", length);
 510                         g_string_append_len(buf, (char *) body, length);
 511                         g_string_append(buf, "\r\n");
 512                 } else
 513                         g_string_append_len(buf, (char *) body, length);
 514         }
 515 }
 516
 517 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 518                                                 gpointer user_data)
 519 {
 520         struct web_session *session = user_data;
 521
 522         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 523                 session->send_watch = 0;
 524                 return FALSE;
 525         }
 526
 527         if (process_send_buffer(session) == TRUE)
 528                 return TRUE;
 529
 530         if (session->request_started == FALSE) {
 531                 session->request_started = TRUE;
 532                 start_request(session);
 533         } else if (session->more_data == TRUE)
 534                 process_next_chunk(session);
 535
 536         process_send_buffer(session);
 537
 538         if (session->body_done == TRUE) {
 539                 session->send_watch = 0;
 540                 return FALSE;
 541         }
 542
 543         return TRUE;
 544 }
 545
 546 static int decode_chunked(struct web_session *session,
 547                                         const guint8 *buf, gsize len)
 548 {
 549         const guint8 *ptr = buf;
 550         gsize counter;
 551
 552         while (len > 0) {
 553                 guint8 *pos;
 554                 gsize count;
 555                 char *str;
 556
 557                 switch (session->chunck_state) {
 558                 case CHUNK_SIZE:
 559                         pos = memchr(ptr, '\n', len);
 560                         if (pos == NULL) {
 561                                 g_string_append_len(session->current_header,
 562                                                 (gchar *) ptr, len);
 563                                 return 0;
 564                         }
 565
 566                         count = pos - ptr;
 567                         if (count < 1 || ptr[count - 1] != '\r')
 568                                 return -EILSEQ;
 569
 570                         g_string_append_len(session->current_header,
 571                                                 (gchar *) ptr, count);
 572
 573                         len -= count + 1;
 574                         ptr = pos + 1;
 575
 576                         str = session->current_header->str;
 577
 578                         counter = strtoul(str, NULL, 16);
 579                         if ((counter == 0 && errno == EINVAL) ||
 580                                                 counter == ULONG_MAX)
 581                                 return -EILSEQ;
 582
 583                         session->chunk_size = counter;
 584                         session->chunk_left = counter;
 585
 586                         session->chunck_state = CHUNK_DATA;
 587                         break;
 588                 case CHUNK_R_BODY:
 589                         if (*ptr != '\r')
 590                                 return -EILSEQ;
 591                         ptr++;
 592                         len--;
 593                         session->chunck_state = CHUNK_N_BODY;
 594                         break;
 595                 case CHUNK_N_BODY:
 596                         if (*ptr != '\n')
 597                                 return -EILSEQ;
 598                         ptr++;
 599                         len--;
 600                         session->chunck_state = CHUNK_SIZE;
 601                         break;
 602                 case CHUNK_DATA:
 603                         if (session->chunk_size == 0) {
 604                                 debug(session->web, "Download Done in chunk");
 605                                 g_string_truncate(session->current_header, 0);
 606                                 return 0;
 607                         }
 608
 609                         if (session->chunk_left <= len) {
 610                                 session->result.buffer = ptr;
 611                                 session->result.length = session->chunk_left;
 612                                 call_result_func(session, 0);
 613
 614                                 len -= session->chunk_left;
 615                                 ptr += session->chunk_left;
 616
 617                                 session->total_len += session->chunk_left;
 618                                 session->chunk_left = 0;
 619
 620                                 g_string_truncate(session->current_header, 0);
 621                                 session->chunck_state = CHUNK_R_BODY;
 622                                 break;
 623                         }
 624                         /* more data */
 625                         session->result.buffer = ptr;
 626                         session->result.length = len;
 627                         call_result_func(session, 0);
 628
 629                         session->chunk_left -= len;
 630                         session->total_len += len;
 631
 632                         len -= len;
 633                         ptr += len;
 634                         break;
 635                 }
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int handle_body(struct web_session *session,
 642                                 const guint8 *buf, gsize len)
 643 {
 644         int err;
 645
 646         debug(session->web, "[body] length %zu", len);
 647
 648         if (session->result.use_chunk == FALSE) {
 649                 if (len > 0) {
 650                         session->result.buffer = buf;
 651                         session->result.length = len;
 652                         call_result_func(session, 0);
 653                 }
 654                 return 0;
 655         }
 656
 657         err = decode_chunked(session, buf, len);
 658         if (err < 0) {
 659                 debug(session->web, "Error in chunk decode %d", err);
 660
 661                 session->result.buffer = NULL;
 662                 session->result.length = 0;
 663                 call_result_func(session, 400);
 664         }
 665
 666         return err;
 667 }
 668
 669 static void handle_multi_line(struct web_session *session)
 670 {
 671         gsize count;
 672         char *str;
 673         gchar *value;
 674
 675         str = session->current_header->str;
 676
 677         if (str[0] != ' ' && str[0] != '\t')
 678                 return;
 679
 680         while (str[0] == ' ' || str[0] == '\t')
 681                 str++;
 682
 683         count = str - session->current_header->str;
 684         if (count > 0) {
 685                 g_string_erase(session->current_header, 0, count);
 686                 g_string_insert_c(session->current_header, 0, ' ');
 687         }
 688
 689         value = g_hash_table_lookup(session->result.headers,
 690                                         session->result.last_key);
 691         if (value != NULL) {
 692                 g_string_insert(session->current_header, 0, value);
 693
 694                 str = session->current_header->str;
 695
 696                 g_hash_table_replace(session->result.headers,
 697                                         g_strdup(session->result.last_key),
 698                                         g_strdup(str));
 699         }
 700 }
 701
 702 static void add_header_field(struct web_session *session)
 703 {
 704         gsize count;
 705         guint8 *pos;
 706         char *str;
 707         gchar *value;
 708         gchar *key;
 709
 710         str = session->current_header->str;
 711
 712         pos = memchr(str, ':', session->current_header->len);
 713         if (pos != NULL) {
 714                 *pos = '\0';
 715                 pos++;
 716
 717                 key = g_strdup(str);
 718
 719                 /* remove preceding white spaces */
 720                 while (*pos == ' ')
 721                         pos++;
 722
 723                 count = (char *) pos - str;
 724
 725                 g_string_erase(session->current_header, 0, count);
 726
 727                 value = g_hash_table_lookup(session->result.headers, key);
 728                 if (value != NULL) {
 729                         g_string_insert_c(session->current_header, 0, ' ');
 730                         g_string_insert_c(session->current_header, 0, ';');
 731
 732                         g_string_insert(session->current_header, 0, value);
 733                 }
 734
 735                 str = session->current_header->str;
 736                 g_hash_table_replace(session->result.headers, key,
 737                                                         g_strdup(str));
 738
 739                 g_free(session->result.last_key);
 740                 session->result.last_key = g_strdup(key);
 741         }
 742 }
 743
 744 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 745                                                         gpointer user_data)
 746 {
 747         struct web_session *session = user_data;
 748         guint8 *ptr = session->receive_buffer;
 749         gsize bytes_read;
 750         GIOStatus status;
 751
 752         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 753                 session->transport_watch = 0;
 754                 session->result.buffer = NULL;
 755                 session->result.length = 0;
 756                 call_result_func(session, 400);
 757                 return FALSE;
 758         }
 759
 760         status = g_io_channel_read_chars(channel,
 761                                 (gchar *) session->receive_buffer,
 762                                 session->receive_space - 1, &bytes_read, NULL);
 763
 764         debug(session->web, "bytes read %zu", bytes_read);
 765
 766         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 767                 session->transport_watch = 0;
 768                 session->result.buffer = NULL;
 769                 session->result.length = 0;
 770                 call_result_func(session, 0);
 771                 return FALSE;
 772         }
 773
 774         session->receive_buffer[bytes_read] = '\0';
 775
 776         if (session->header_done == TRUE) {
 777                 if (handle_body(session, session->receive_buffer,
 778                                                         bytes_read) < 0) {
 779                         session->transport_watch = 0;
 780                         return FALSE;
 781                 }
 782                 return TRUE;
 783         }
 784
 785         while (bytes_read > 0) {
 786                 guint8 *pos;
 787                 gsize count;
 788                 char *str;
 789
 790                 pos = memchr(ptr, '\n', bytes_read);
 791                 if (pos == NULL) {
 792                         g_string_append_len(session->current_header,
 793                                                 (gchar *) ptr, bytes_read);
 794                         return TRUE;
 795                 }
 796
 797                 *pos = '\0';
 798                 count = strlen((char *) ptr);
 799                 if (count > 0 && ptr[count - 1] == '\r') {
 800                         ptr[--count] = '\0';
 801                         bytes_read--;
 802                 }
 803
 804                 g_string_append_len(session->current_header,
 805                                                 (gchar *) ptr, count);
 806
 807                 bytes_read -= count + 1;
 808                 if (bytes_read > 0)
 809                         ptr = pos + 1;
 810                 else
 811                         ptr = NULL;
 812
 813                 if (session->current_header->len == 0) {
 814                         char *val;
 815
 816                         session->header_done = TRUE;
 817
 818                         val = g_hash_table_lookup(session->result.headers,
 819                                                         "Transfer-Encoding");
 820                         if (val != NULL) {
 821                                 val = g_strrstr(val, "chunked");
 822                                 if (val != NULL) {
 823                                         session->result.use_chunk = TRUE;
 824
 825                                         session->chunck_state = CHUNK_SIZE;
 826                                         session->chunk_left = 0;
 827                                         session->total_len = 0;
 828                                 }
 829                         }
 830
 831                         if (handle_body(session, ptr, bytes_read) < 0) {
 832                                 session->transport_watch = 0;
 833                                 return FALSE;
 834                         }
 835                         break;
 836                 }
 837
 838                 str = session->current_header->str;
 839
 840                 if (session->result.status == 0) {
 841                         unsigned int code;
 842
 843                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 844                                 session->result.status = code;
 845                 }
 846
 847                 debug(session->web, "[header] %s", str);
 848
 849                 /* handle multi-line header */
 850                 if (str[0] == ' ' || str[0] == '\t')
 851                         handle_multi_line(session);
 852                 else
 853                         add_header_field(session);
 854
 855                 g_string_truncate(session->current_header, 0);
 856         }
 857
 858         return TRUE;
 859 }
 860
 861 static int connect_session_transport(struct web_session *session)
 862 {
 863         GIOFlags flags;
 864         struct sockaddr_in sin;
 865         int sk;
 866
 867         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 868         if (sk < 0)
 869                 return -EIO;
 870
 871         if (session->flags & SESSION_FLAG_USE_TLS) {
 872                 debug(session->web, "using TLS encryption");
 873                 session->transport_channel = g_io_channel_gnutls_new(sk);
 874         } else {
 875                 debug(session->web, "no encryption");
 876                 session->transport_channel = g_io_channel_unix_new(sk);
 877         }
 878
 879         if (session->transport_channel == NULL) {
 880                 close(sk);
 881                 return -ENOMEM;
 882         }
 883
 884         flags = g_io_channel_get_flags(session->transport_channel);
 885         g_io_channel_set_flags(session->transport_channel,
 886                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 887
 888         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 889         g_io_channel_set_buffered(session->transport_channel, FALSE);
 890
 891         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 892
 893         memset(&sin, 0, sizeof(sin));
 894         sin.sin_family = AF_INET;
 895         sin.sin_port = htons(session->port);
 896         sin.sin_addr.s_addr = inet_addr(session->address);
 897
 898         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 899                 if (errno != EINPROGRESS) {
 900                         close(sk);
 901                         return -EIO;
 902                 }
 903         }
 904
 905         session->transport_watch = g_io_add_watch(session->transport_channel,
 906                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 907                                                 received_data, session);
 908
 909         session->send_watch = g_io_add_watch(session->transport_channel,
 910                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 911                                                 send_data, session);
 912
 913         return 0;
 914 }
 915
 916 static int create_transport(struct web_session *session)
 917 {
 918         int err;
 919
 920         err = connect_session_transport(session);
 921         if (err < 0)
 922                 return err;
 923
 924         debug(session->web, "creating session %s:%u",
 925                                         session->address, session->port);
 926
 927         return 0;
 928 }
 929
 930 static int parse_url(struct web_session *session,
 931                                 const char *url, const char *proxy)
 932 {
 933         char *scheme, *host, *port, *path;
 934
 935         scheme = g_strdup(url);
 936         if (scheme == NULL)
 937                 return -EINVAL;
 938
 939         host = strstr(scheme, "://");
 940         if (host != NULL) {
 941                 *host = '\0';
 942                 host += 3;
 943
 944                 if (strcasecmp(scheme, "https") == 0) {
 945                         session->port = 443;
 946                         session->flags |= SESSION_FLAG_USE_TLS;
 947                 } else if (strcasecmp(scheme, "http") == 0) {
 948                         session->port = 80;
 949                 } else {
 950                         g_free(scheme);
 951                         return -EINVAL;
 952                 }
 953         } else {
 954                 host = scheme;
 955                 session->port = 80;
 956         }
 957
 958         path = strchr(host, '/');
 959         if (path != NULL)
 960                 *(path++) = '\0';
 961
 962         if (proxy == NULL)
 963                 session->request = g_strdup_printf("/%s", path ? path : "");
 964         else
 965                 session->request = g_strdup(url);
 966
 967         port = strrchr(host, ':');
 968         if (port != NULL) {
 969                 char *end;
 970                 int tmp = strtol(port + 1, &end, 10);
 971
 972                 if (*end == '\0') {
 973                         *port = '\0';
 974                         session->port = tmp;
 975                 }
 976
 977                 if (proxy == NULL)
 978                         session->host = g_strdup(host);
 979                 else
 980                         session->host = g_strdup_printf("%s:%u", host, tmp);
 981         } else
 982                 session->host = g_strdup(host);
 983
 984         g_free(scheme);
 985
 986         if (proxy == NULL)
 987                 return 0;
 988
 989         scheme = g_strdup(proxy);
 990         if (scheme == NULL)
 991                 return -EINVAL;
 992
 993         host = strstr(proxy, "://");
 994         if (host != NULL) {
 995                 *host = '\0';
 996                 host += 3;
 997
 998                 if (strcasecmp(scheme, "http") != 0) {
 999                         g_free(scheme);
1000                         return -EINVAL;
1001                 }
1002         } else
1003                 host = scheme;
1004
1005         path = strchr(host, '/');
1006         if (path != NULL)
1007                 *(path++) = '\0';
1008
1009         port = strrchr(host, ':');
1010         if (port != NULL) {
1011                 char *end;
1012                 int tmp = strtol(port + 1, &end, 10);
1013
1014                 if (*end == '\0') {
1015                         *port = '\0';
1016                         session->port = tmp;
1017                 }
1018         }
1019
1020         session->address = g_strdup(host);
1021
1022         g_free(scheme);
1023
1024         return 0;
1025 }
1026
1027 static void resolv_result(GResolvResultStatus status,
1028                                         char **results, gpointer user_data)
1029 {
1030         struct web_session *session = user_data;
1031
1032         if (results == NULL || results[0] == NULL) {
1033                 call_result_func(session, 404);
1034                 return;
1035         }
1036
1037         debug(session->web, "address %s", results[0]);
1038
1039         if (inet_aton(results[0], NULL) == 0) {
1040                 call_result_func(session, 400);
1041                 return;
1042         }
1043
1044         session->address = g_strdup(results[0]);
1045
1046         if (create_transport(session) < 0) {
1047                 call_result_func(session, 409);
1048                 return;
1049         }
1050 }
1051
1052 static guint do_request(GWeb *web, const char *url,
1053                                 const char *type, GWebInputFunc input,
1054                                 GWebResultFunc func, gpointer user_data)
1055 {
1056         struct web_session *session;
1057
1058         if (web == NULL || url == NULL)
1059                 return 0;
1060
1061         debug(web, "request %s", url);
1062
1063         session = g_try_new0(struct web_session, 1);
1064         if (session == NULL)
1065                 return 0;
1066
1067         if (parse_url(session, url, web->proxy) < 0) {
1068                 free_session(session);
1069                 return 0;
1070         }
1071
1072         debug(web, "address %s", session->address);
1073         debug(web, "port %u", session->port);
1074         debug(web, "host %s", session->host);
1075         debug(web, "flags %lu", session->flags);
1076         debug(web, "request %s", session->request);
1077
1078         if (type != NULL) {
1079                 session->content_type = g_strdup(type);
1080
1081                 debug(web, "content-type %s", session->content_type);
1082         }
1083
1084         session->web = web;
1085
1086         session->result_func = func;
1087         session->input_func = input;
1088         session->user_data = user_data;
1089
1090         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1091         if (session->receive_buffer == NULL) {
1092                 free_session(session);
1093                 return 0;
1094         }
1095
1096         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1097                                                         g_free, g_free);
1098         if (session->result.headers == NULL) {
1099                 free_session(session);
1100                 return 0;
1101         }
1102
1103         session->receive_space = DEFAULT_BUFFER_SIZE;
1104         session->send_buffer = g_string_sized_new(0);
1105         session->current_header = g_string_sized_new(0);
1106         session->header_done = FALSE;
1107         session->body_done = FALSE;
1108
1109         if (session->address == NULL && inet_aton(session->host, NULL) == 0) {
1110                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1111                                         session->host, resolv_result, session);
1112                 if (session->resolv_action == 0) {
1113                         free_session(session);
1114                         return 0;
1115                 }
1116         } else {
1117                 if (session->address == NULL)
1118                         session->address = g_strdup(session->host);
1119
1120                 if (create_transport(session) < 0) {
1121                         free_session(session);
1122                         return 0;
1123                 }
1124         }
1125
1126         web->session_list = g_list_append(web->session_list, session);
1127
1128         return web->next_query_id++;
1129 }
1130
1131 guint g_web_request_get(GWeb *web, const char *url,
1132                                 GWebResultFunc func, gpointer user_data)
1133 {
1134         return do_request(web, url, NULL, NULL, func, user_data);
1135 }
1136
1137 guint g_web_request_post(GWeb *web, const char *url,
1138                                 const char *type, GWebInputFunc input,
1139                                 GWebResultFunc func, gpointer user_data)
1140 {
1141         return do_request(web, url, type, input, func, user_data);
1142 }
1143
1144 gboolean g_web_cancel_request(GWeb *web, guint id)
1145 {
1146         if (web == NULL)
1147                 return FALSE;
1148
1149         return TRUE;
1150 }
1151
1152 guint16 g_web_result_get_status(GWebResult *result)
1153 {
1154         if (result == NULL)
1155                 return 0;
1156
1157         return result->status;
1158 }
1159
1160 gboolean g_web_result_get_chunk(GWebResult *result,
1161                                 const guint8 **chunk, gsize *length)
1162 {
1163         if (result == NULL)
1164                 return FALSE;
1165
1166         if (chunk == NULL)
1167                 return FALSE;
1168
1169         *chunk = result->buffer;
1170
1171         if (length != NULL)
1172                 *length = result->length;
1173
1174         return TRUE;
1175 }
1176
1177 gboolean g_web_result_get_header(GWebResult *result,
1178                                 const char *header, const char **value)
1179 {
1180         if (result == NULL)
1181                 return FALSE;
1182
1183         if (value == NULL)
1184                 return FALSE;
1185
1186         *value = g_hash_table_lookup(result->headers, header);
1187
1188         if (*value == NULL)
1189                 return FALSE;
1190
1191         return TRUE;
1192 }
1193
1194 struct _GWebParser {
1195         gint ref_count;
1196         char *begin_token;
1197         char *end_token;
1198         const char *token_str;
1199         size_t token_len;
1200         size_t token_pos;
1201         gboolean intoken;
1202         GString *content;
1203         GWebParserFunc func;
1204         gpointer user_data;
1205 };
1206
1207 GWebParser *g_web_parser_new(const char *begin, const char *end,
1208                                 GWebParserFunc func, gpointer user_data)
1209 {
1210         GWebParser *parser;
1211
1212         parser = g_try_new0(GWebParser, 1);
1213         if (parser == NULL)
1214                 return NULL;
1215
1216         parser->ref_count = 1;
1217
1218         parser->begin_token = g_strdup(begin);
1219         parser->end_token = g_strdup(end);
1220
1221         if (parser->begin_token == NULL) {
1222                 g_free(parser);
1223                 return NULL;
1224         }
1225
1226         parser->func = func;
1227         parser->user_data = user_data;
1228
1229         parser->token_str = parser->begin_token;
1230         parser->token_len = strlen(parser->token_str);
1231         parser->token_pos = 0;
1232
1233         parser->intoken = FALSE;
1234         parser->content = g_string_sized_new(0);
1235
1236         return parser;
1237 }
1238
1239 GWebParser *g_web_parser_ref(GWebParser *parser)
1240 {
1241         if (parser == NULL)
1242                 return NULL;
1243
1244         g_atomic_int_inc(&parser->ref_count);
1245
1246         return parser;
1247 }
1248
1249 void g_web_parser_unref(GWebParser *parser)
1250 {
1251         if (parser == NULL)
1252                 return;
1253
1254         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1255                 return;
1256
1257         g_string_free(parser->content, TRUE);
1258
1259         g_free(parser->begin_token);
1260         g_free(parser->end_token);
1261         g_free(parser);
1262 }
1263
1264 void g_web_parser_feed_data(GWebParser *parser,
1265                                 const guint8 *data, gsize length)
1266 {
1267         const guint8 *ptr = data;
1268
1269         if (parser == NULL)
1270                 return;
1271
1272         while (length > 0) {
1273                 guint8 chr = parser->token_str[parser->token_pos];
1274
1275                 if (parser->token_pos == 0) {
1276                         guint8 *pos;
1277
1278                         pos = memchr(ptr, chr, length);
1279                         if (pos == NULL) {
1280                                 if (parser->intoken == TRUE)
1281                                         g_string_append_len(parser->content,
1282                                                         (gchar *) ptr, length);
1283                                 break;
1284                         }
1285
1286                         if (parser->intoken == TRUE)
1287                                 g_string_append_len(parser->content,
1288                                                 (gchar *) ptr, (pos - ptr) + 1);
1289
1290                         length -= (pos - ptr) + 1;
1291                         ptr = pos + 1;
1292
1293                         parser->token_pos++;
1294                         continue;
1295                 }
1296
1297                 if (parser->intoken == TRUE)
1298                         g_string_append_c(parser->content, ptr[0]);
1299
1300                 if (ptr[0] != chr) {
1301                         length--;
1302                         ptr++;
1303
1304                         parser->token_pos = 0;
1305                         continue;
1306                 }
1307
1308                 length--;
1309                 ptr++;
1310
1311                 parser->token_pos++;
1312
1313                 if (parser->token_pos == parser->token_len) {
1314                         if (parser->intoken == FALSE) {
1315                                 g_string_append(parser->content,
1316                                                         parser->token_str);
1317
1318                                 parser->intoken = TRUE;
1319                                 parser->token_str = parser->end_token;
1320                                 parser->token_len = strlen(parser->end_token);
1321                                 parser->token_pos = 0;
1322                         } else {
1323                                 char *str;
1324                                 str = g_string_free(parser->content, FALSE);
1325                                 parser->content = g_string_sized_new(0);
1326                                 if (parser->func)
1327                                         parser->func(str, parser->user_data);
1328                                 g_free(str);
1329
1330                                 parser->intoken = FALSE;
1331                                 parser->token_str = parser->begin_token;
1332                                 parser->token_len = strlen(parser->begin_token);
1333                                 parser->token_pos = 0;
1334                         }
1335                 }
1336         }
1337 }
1338
1339 void g_web_parser_end_data(GWebParser *parser)
1340 {
1341         if (parser == NULL)
1342                 return;
1343 }