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 struct _GWebResult {
  44         guint16 status;
  45         const guint8 *buffer;
  46         gsize length;
  47 };
  48
  49 struct web_session {
  50         GWeb *web;
  51
  52         char *address;
  53         char *host;
  54         uint16_t port;
  55         unsigned long flags;
  56
  57         GIOChannel *transport_channel;
  58         guint transport_watch;
  59
  60         guint resolv_action;
  61         char *request;
  62
  63         guint8 *receive_buffer;
  64         gsize receive_space;
  65         GString *current_header;
  66         gboolean header_done;
  67
  68         GWebResult result;
  69
  70         GWebResultFunc result_func;
  71         gpointer result_data;
  72 };
  73
  74 struct _GWeb {
  75         gint ref_count;
  76
  77         guint next_query_id;
  78
  79         int index;
  80         GList *session_list;
  81
  82         GResolv *resolv;
  83         char *accept_option;
  84         char *user_agent;
  85         gboolean close_connection;
  86
  87         GWebDebugFunc debug_func;
  88         gpointer debug_data;
  89 };
  90
  91 static inline void debug(GWeb *web, const char *format, ...)
  92 {
  93         char str[256];
  94         va_list ap;
  95
  96         if (web->debug_func == NULL)
  97                 return;
  98
  99         va_start(ap, format);
 100
 101         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 102                 web->debug_func(str, web->debug_data);
 103
 104         va_end(ap);
 105 }
 106
 107 static void free_session(struct web_session *session)
 108 {
 109         GWeb *web = session->web;
 110
 111         if (session == NULL)
 112                 return;
 113
 114         g_free(session->request);
 115
 116         if (session->resolv_action > 0)
 117                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 118
 119         if (session->transport_watch > 0)
 120                 g_source_remove(session->transport_watch);
 121
 122         if (session->transport_channel != NULL)
 123                 g_io_channel_unref(session->transport_channel);
 124
 125         g_string_free(session->current_header, TRUE);
 126         g_free(session->receive_buffer);
 127
 128         g_free(session->host);
 129         g_free(session->address);
 130         g_free(session);
 131 }
 132
 133 static void flush_sessions(GWeb *web)
 134 {
 135         GList *list;
 136
 137         for (list = g_list_first(web->session_list);
 138                                         list; list = g_list_next(list))
 139                 free_session(list->data);
 140
 141         g_list_free(web->session_list);
 142         web->session_list = NULL;
 143 }
 144
 145 GWeb *g_web_new(int index)
 146 {
 147         GWeb *web;
 148
 149         if (index < 0)
 150                 return NULL;
 151
 152         web = g_try_new0(GWeb, 1);
 153         if (web == NULL)
 154                 return NULL;
 155
 156         web->ref_count = 1;
 157
 158         web->next_query_id = 1;
 159
 160         web->index = index;
 161         web->session_list = NULL;
 162
 163         web->resolv = g_resolv_new(index);
 164         if (web->resolv == NULL) {
 165                 g_free(web);
 166                 return NULL;
 167         }
 168
 169         web->accept_option = g_strdup("*/*");
 170         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 171         web->close_connection = FALSE;
 172
 173         return web;
 174 }
 175
 176 GWeb *g_web_ref(GWeb *web)
 177 {
 178         if (web == NULL)
 179                 return NULL;
 180
 181         g_atomic_int_inc(&web->ref_count);
 182
 183         return web;
 184 }
 185
 186 void g_web_unref(GWeb *web)
 187 {
 188         if (web == NULL)
 189                 return;
 190
 191         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 192                 return;
 193
 194         flush_sessions(web);
 195
 196         g_resolv_unref(web->resolv);
 197
 198         g_free(web->accept_option);
 199         g_free(web->user_agent);
 200         g_free(web);
 201 }
 202
 203 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 204 {
 205         if (web == NULL)
 206                 return;
 207
 208         web->debug_func = func;
 209         web->debug_data = user_data;
 210
 211         g_resolv_set_debug(web->resolv, func, user_data);
 212 }
 213
 214 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 215 {
 216         if (web == NULL)
 217                 return FALSE;
 218
 219         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 220
 221         return TRUE;
 222 }
 223
 224 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 225 {
 226         g_free(web->accept_option);
 227
 228         if (format == NULL) {
 229                 web->accept_option = NULL;
 230                 debug(web, "clearing accept option");
 231         } else {
 232                 web->accept_option = g_strdup_vprintf(format, args);
 233                 debug(web, "setting accept %s", web->accept_option);
 234         }
 235
 236         return TRUE;
 237 }
 238
 239 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 240 {
 241         va_list args;
 242         gboolean result;
 243
 244         if (web == NULL)
 245                 return FALSE;
 246
 247         va_start(args, format);
 248         result = set_accept_option(web, format, args);
 249         va_end(args);
 250
 251         return result;
 252 }
 253
 254 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 255 {
 256         g_free(web->user_agent);
 257
 258         if (format == NULL) {
 259                 web->user_agent = NULL;
 260                 debug(web, "clearing user agent");
 261         } else {
 262                 web->user_agent = g_strdup_vprintf(format, args);
 263                 debug(web, "setting user agent %s", web->user_agent);
 264         }
 265
 266         return TRUE;
 267 }
 268
 269 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 270 {
 271         va_list args;
 272         gboolean result;
 273
 274         if (web == NULL)
 275                 return FALSE;
 276
 277         va_start(args, format);
 278         result = set_user_agent(web, format, args);
 279         va_end(args);
 280
 281         return result;
 282 }
 283
 284 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 285 {
 286         if (web == NULL)
 287                 return;
 288
 289         web->close_connection = enabled;
 290 }
 291
 292 gboolean g_web_get_close_connection(GWeb *web)
 293 {
 294         if (web == NULL)
 295                 return FALSE;
 296
 297         return web->close_connection;
 298 }
 299
 300 static inline void call_result_func(struct web_session *session, guint16 status)
 301 {
 302         if (session->result_func == NULL)
 303                 return;
 304
 305         if (status != 0)
 306                 session->result.status = status;
 307
 308         session->result_func(&session->result, session->result_data);
 309 }
 310
 311 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 312                                                         gpointer user_data)
 313 {
 314         struct web_session *session = user_data;
 315         guint8 *ptr = session->receive_buffer;
 316         gsize bytes_read;
 317         GIOStatus status;
 318
 319         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 320                 session->transport_watch = 0;
 321                 session->result.buffer = NULL;
 322                 session->result.length = 0;
 323                 call_result_func(session, 400);
 324                 return FALSE;
 325         }
 326
 327         status = g_io_channel_read_chars(channel,
 328                                 (gchar *) session->receive_buffer,
 329                                 session->receive_space - 1, &bytes_read, NULL);
 330
 331         debug(session->web, "bytes read %zu", bytes_read);
 332
 333         if (status != G_IO_STATUS_NORMAL) {
 334                 session->transport_watch = 0;
 335                 session->result.buffer = NULL;
 336                 session->result.length = 0;
 337                 call_result_func(session, 0);
 338                 return FALSE;
 339         }
 340
 341         session->receive_buffer[bytes_read] = '\0';
 342
 343         if (session->header_done == TRUE) {
 344                 session->result.buffer = session->receive_buffer;
 345                 session->result.length = bytes_read;
 346                 call_result_func(session, 0);
 347                 return TRUE;
 348         }
 349
 350         while (bytes_read > 0) {
 351                 guint8 *pos;
 352                 gsize count;
 353                 char *str;
 354
 355                 pos = memchr(ptr, '\n', bytes_read);
 356                 if (pos == NULL) {
 357                         g_string_append_len(session->current_header,
 358                                                 (gchar *) ptr, bytes_read);
 359                         return TRUE;
 360                 }
 361
 362                 *pos = '\0';
 363                 count = strlen((char *) ptr);
 364                 if (count > 0 && ptr[count - 1] == '\r') {
 365                         ptr[--count] = '\0';
 366                         bytes_read--;
 367                 }
 368
 369                 g_string_append_len(session->current_header,
 370                                                 (gchar *) ptr, count);
 371
 372                 bytes_read -= count + 1;
 373                 ptr = pos + 1;
 374
 375                 if (session->current_header->len == 0) {
 376                         session->header_done = TRUE;
 377                         session->result.buffer = pos + 1;
 378                         session->result.length = bytes_read;
 379                         call_result_func(session, 0);
 380                         break;
 381                 }
 382
 383                 str = session->current_header->str;
 384
 385                 if (session->result.status == 0) {
 386                         unsigned int code;
 387
 388                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 389                                 session->result.status = code;
 390                 }
 391
 392                 debug(session->web, "[header] %s", str);
 393
 394                 g_string_truncate(session->current_header, 0);
 395         }
 396
 397         return TRUE;
 398 }
 399
 400 static int connect_session_transport(struct web_session *session)
 401 {
 402         struct sockaddr_in sin;
 403         int sk;
 404
 405         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 406         if (sk < 0)
 407                 return -EIO;
 408
 409         memset(&sin, 0, sizeof(sin));
 410         sin.sin_family = AF_INET;
 411         sin.sin_port = htons(session->port);
 412         sin.sin_addr.s_addr = inet_addr(session->address);
 413
 414         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 415                 close(sk);
 416                 return -EIO;
 417         }
 418
 419         if (session->flags & SESSION_FLAG_USE_TLS)
 420                 session->transport_channel = g_io_channel_gnutls_new(sk);
 421         else
 422                 session->transport_channel = g_io_channel_unix_new(sk);
 423
 424         if (session->transport_channel == NULL) {
 425                 close(sk);
 426                 return -ENOMEM;
 427         }
 428
 429         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 430         g_io_channel_set_buffered(session->transport_channel, FALSE);
 431
 432         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 433
 434         session->transport_watch = g_io_add_watch(session->transport_channel,
 435                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 436                                                 received_data, session);
 437
 438         return 0;
 439 }
 440
 441 static int create_transport(struct web_session *session)
 442 {
 443         int err;
 444
 445         err = connect_session_transport(session);
 446         if (err < 0)
 447                 return err;
 448
 449         debug(session->web, "creating session %s:%u",
 450                                         session->address, session->port);
 451
 452         return 0;
 453 }
 454
 455 static void start_request(struct web_session *session)
 456 {
 457         GString *buf;
 458         gchar *str;
 459         gsize count, bytes_written;
 460         GIOStatus status;
 461
 462         debug(session->web, "request %s from %s",
 463                                         session->request, session->host);
 464
 465         buf = g_string_new(NULL);
 466         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 467         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 468         if (session->web->user_agent != NULL)
 469                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 470                                                 session->web->user_agent);
 471         if (session->web->accept_option != NULL)
 472                 g_string_append_printf(buf, "Accept: %s\r\n",
 473                                                 session->web->accept_option);
 474         if (session->web->close_connection == TRUE)
 475                 g_string_append(buf, "Connection: close\r\n");
 476         g_string_append(buf, "\r\n");
 477         str = g_string_free(buf, FALSE);
 478
 479         count = strlen(str);
 480
 481         debug(session->web, "bytes to write %zu", count);
 482
 483         status = g_io_channel_write_chars(session->transport_channel,
 484                                         str, count, &bytes_written, NULL);
 485
 486         debug(session->web, "status %u bytes written %zu",
 487                                                 status, bytes_written);
 488
 489         //printf("%s", str);
 490
 491         g_free(str);
 492 }
 493
 494 static int parse_url(struct web_session *session, const char *url)
 495 {
 496         char *scheme, *host, *port, *path;
 497
 498         scheme = g_strdup(url);
 499         if (scheme == NULL)
 500                 return -EINVAL;
 501
 502         host = strstr(scheme, "://");
 503         if (host != NULL) {
 504                 *host = '\0';
 505                 host += 3;
 506
 507                 if (strcasecmp(scheme, "https") == 0) {
 508                         session->port = 443;
 509                         session->flags |= SESSION_FLAG_USE_TLS;
 510                 } else if (strcasecmp(scheme, "http") == 0) {
 511                         session->port = 80;
 512                 } else {
 513                         g_free(scheme);
 514                         return -EINVAL;
 515                 }
 516         } else {
 517                 host = scheme;
 518                 session->port = 80;
 519         }
 520
 521         path = strchr(host, '/');
 522         if (path != NULL)
 523                 *(path++) = '\0';
 524
 525         session->request = g_strdup_printf("/%s", path ? path : "");
 526
 527         port = strrchr(host, ':');
 528         if (port != NULL) {
 529                 char *end;
 530                 int tmp = strtol(port + 1, &end, 10);
 531
 532                 if (*end == '\0') {
 533                         *port = '\0';
 534                         session->port = tmp;
 535                 }
 536         }
 537
 538         session->host = g_strdup(host);
 539
 540         g_free(scheme);
 541
 542         return 0;
 543 }
 544
 545 static void resolv_result(GResolvResultStatus status,
 546                                         char **results, gpointer user_data)
 547 {
 548         struct web_session *session = user_data;
 549
 550         if (results == NULL || results[0] == NULL) {
 551                 call_result_func(session, 404);
 552                 return;
 553         }
 554
 555         debug(session->web, "address %s", results[0]);
 556
 557         if (inet_aton(results[0], NULL) == 0) {
 558                 call_result_func(session, 400);
 559                 return;
 560         }
 561
 562         session->address = g_strdup(results[0]);
 563
 564         if (create_transport(session) < 0) {
 565                 call_result_func(session, 409);
 566                 return;
 567         }
 568
 569         start_request(session);
 570 }
 571
 572 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 573                                 GWebResultFunc func, gpointer user_data)
 574 {
 575         struct web_session *session;
 576
 577         if (web == NULL || url == NULL)
 578                 return 0;
 579
 580         debug(web, "request %s", url);
 581
 582         session = g_try_new0(struct web_session, 1);
 583         if (session == NULL)
 584                 return 0;
 585
 586         if (parse_url(session, url) < 0) {
 587                 free_session(session);
 588                 return 0;
 589         }
 590
 591         debug(web, "host %s:%u", session->host, session->port);
 592         debug(web, "flags %lu", session->flags);
 593
 594         session->web = web;
 595
 596         session->result_func = func;
 597         session->result_data = user_data;
 598
 599         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 600         if (session->receive_buffer == NULL) {
 601                 free_session(session);
 602                 return 0;
 603         }
 604
 605         session->receive_space = DEFAULT_BUFFER_SIZE;
 606         session->current_header = g_string_sized_new(0);
 607         session->header_done = FALSE;
 608
 609         if (inet_aton(session->host, NULL) == 0) {
 610                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 611                                         session->host, resolv_result, session);
 612                 if (session->resolv_action == 0) {
 613                         free_session(session);
 614                         return 0;
 615                 }
 616         } else {
 617                 session->address = g_strdup(session->host);
 618
 619                 if (create_transport(session) < 0) {
 620                         free_session(session);
 621                         return 0;
 622                 }
 623
 624                 start_request(session);
 625         }
 626
 627         web->session_list = g_list_append(web->session_list, session);
 628
 629         return web->next_query_id++;
 630 }
 631
 632 guint16 g_web_result_get_status(GWebResult *result)
 633 {
 634         if (result == NULL)
 635                 return 0;
 636
 637         return result->status;
 638 }
 639
 640 gboolean g_web_result_get_chunk(GWebResult *result,
 641                                 const guint8 **chunk, gsize *length)
 642 {
 643         if (result == NULL)
 644                 return FALSE;
 645
 646         if (chunk == NULL)
 647                 return FALSE;
 648
 649         *chunk = result->buffer;
 650
 651         if (length != NULL)
 652                 *length = result->length;
 653
 654         return TRUE;
 655 }
 656
 657 struct _GWebParser {
 658         gint ref_count;
 659         char *begin_token;
 660         char *end_token;
 661         const char *token_str;
 662         size_t token_len;
 663         size_t token_pos;
 664         gboolean intoken;
 665         GString *content;
 666         GWebParserFunc func;
 667         gpointer user_data;
 668 };
 669
 670 GWebParser *g_web_parser_new(const char *begin, const char *end,
 671                                 GWebParserFunc func, gpointer user_data)
 672 {
 673         GWebParser *parser;
 674
 675         parser = g_try_new0(GWebParser, 1);
 676         if (parser == NULL)
 677                 return NULL;
 678
 679         parser->ref_count = 1;
 680
 681         parser->begin_token = g_strdup(begin);
 682         parser->end_token = g_strdup(end);
 683
 684         if (parser->begin_token == NULL) {
 685                 g_free(parser);
 686                 return NULL;
 687         }
 688
 689         parser->func = func;
 690         parser->user_data = user_data;
 691
 692         parser->token_str = parser->begin_token;
 693         parser->token_len = strlen(parser->token_str);
 694         parser->token_pos = 0;
 695
 696         parser->intoken = FALSE;
 697         parser->content = g_string_sized_new(0);
 698
 699         return parser;
 700 }
 701
 702 GWebParser *g_web_parser_ref(GWebParser *parser)
 703 {
 704         if (parser == NULL)
 705                 return NULL;
 706
 707         g_atomic_int_inc(&parser->ref_count);
 708
 709         return parser;
 710 }
 711
 712 void g_web_parser_unref(GWebParser *parser)
 713 {
 714         if (parser == NULL)
 715                 return;
 716
 717         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
 718                 return;
 719
 720         g_string_free(parser->content, TRUE);
 721
 722         g_free(parser->begin_token);
 723         g_free(parser->end_token);
 724         g_free(parser);
 725 }
 726
 727 void g_web_parser_feed_data(GWebParser *parser,
 728                                 const guint8 *data, gsize length)
 729 {
 730         const guint8 *ptr = data;
 731
 732         if (parser == NULL)
 733                 return;
 734
 735         while (length > 0) {
 736                 guint8 chr = parser->token_str[parser->token_pos];
 737
 738                 if (parser->token_pos == 0) {
 739                         guint8 *pos;
 740
 741                         pos = memchr(ptr, chr, length);
 742                         if (pos == NULL) {
 743                                 if (parser->intoken == TRUE)
 744                                         g_string_append_len(parser->content,
 745                                                         (gchar *) ptr, length);
 746                                 break;
 747                         }
 748
 749                         if (parser->intoken == TRUE)
 750                                 g_string_append_len(parser->content,
 751                                                 (gchar *) ptr, (pos - ptr) + 1);
 752
 753                         length -= (pos - ptr) + 1;
 754                         ptr = pos + 1;
 755
 756                         parser->token_pos++;
 757                         continue;
 758                 }
 759
 760                 if (parser->intoken == TRUE)
 761                         g_string_append_c(parser->content, ptr[0]);
 762
 763                 if (ptr[0] != chr) {
 764                         length--;
 765                         ptr++;
 766
 767                         parser->token_pos = 0;
 768                         continue;
 769                 }
 770
 771                 length--;
 772                 ptr++;
 773
 774                 parser->token_pos++;
 775
 776                 if (parser->token_pos == parser->token_len) {
 777                         if (parser->intoken == FALSE) {
 778                                 g_string_append(parser->content,
 779                                                         parser->token_str);
 780
 781                                 parser->intoken = TRUE;
 782                                 parser->token_str = parser->end_token;
 783                                 parser->token_len = strlen(parser->end_token);
 784                                 parser->token_pos = 0;
 785                         } else {
 786                                 char *str;
 787                                 str = g_string_free(parser->content, FALSE);
 788                                 parser->content = g_string_sized_new(0);
 789                                 if (parser->func)
 790                                         parser->func(str, parser->user_data);
 791                                 g_free(str);
 792
 793                                 parser->intoken = FALSE;
 794                                 parser->token_str = parser->begin_token;
 795                                 parser->token_len = strlen(parser->begin_token);
 796                                 parser->token_pos = 0;
 797                         }
 798                 }
 799         }
 800 }
 801
 802 void g_web_parser_end_data(GWebParser *parser)
 803 {
 804         if (parser == NULL)
 805                 return;
 806 }