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 LINE_CHUNK_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 struct _GWebResult {
  44         guint 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         char *line_buffer;
  64         char *line_offset;
  65         unsigned int line_space;
  66         char *current_line;
  67         gboolean header_done;
  68
  69         GWebResult result;
  70
  71         GWebResultFunc result_func;
  72         gpointer result_data;
  73 };
  74
  75 struct _GWeb {
  76         gint ref_count;
  77
  78         guint next_query_id;
  79
  80         int index;
  81         GList *session_list;
  82
  83         GResolv *resolv;
  84         char *accept_option;
  85         char *user_agent;
  86         gboolean close_connection;
  87
  88         GWebDebugFunc debug_func;
  89         gpointer debug_data;
  90 };
  91
  92 static inline void debug(GWeb *web, const char *format, ...)
  93 {
  94         char str[256];
  95         va_list ap;
  96
  97         if (web->debug_func == NULL)
  98                 return;
  99
 100         va_start(ap, format);
 101
 102         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 103                 web->debug_func(str, web->debug_data);
 104
 105         va_end(ap);
 106 }
 107
 108 static void free_session(struct web_session *session)
 109 {
 110         GWeb *web = session->web;
 111
 112         if (session == NULL)
 113                 return;
 114
 115         g_free(session->request);
 116
 117         if (session->resolv_action > 0)
 118                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 119
 120         if (session->transport_watch > 0)
 121                 g_source_remove(session->transport_watch);
 122
 123         if (session->transport_channel != NULL)
 124                 g_io_channel_unref(session->transport_channel);
 125
 126         g_free(session->line_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, guint status)
 301 {
 302         if (session->result_func == NULL)
 303                 return;
 304
 305         session->result_func(status, &session->result, session->result_data);
 306 }
 307
 308 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 309                                                         gpointer user_data)
 310 {
 311         struct web_session *session = user_data;
 312         gsize bytes_read, consumed = 0;
 313         GIOStatus status;
 314         size_t count;
 315         char *str;
 316
 317         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 318                 session->transport_watch = 0;
 319                 session->result.buffer = NULL;
 320                 session->result.length = 0;
 321                 call_result_func(session, 400);
 322                 return FALSE;
 323         }
 324
 325         status = g_io_channel_read_chars(channel, session->line_offset,
 326                                 session->line_space - 1, &bytes_read, NULL);
 327
 328         debug(session->web, "status %u bytes read %zu", status, bytes_read);
 329
 330         if (status != G_IO_STATUS_NORMAL) {
 331                 session->transport_watch = 0;
 332                 session->result.buffer = NULL;
 333                 session->result.length = 0;
 334                 call_result_func(session, 200);
 335                 return FALSE;
 336         }
 337
 338         if (session->header_done == TRUE) {
 339                 session->line_buffer[bytes_read] = '\0';
 340                 session->result.length = bytes_read;
 341                 call_result_func(session, 100);
 342                 return TRUE;
 343         }
 344
 345         str = memchr(session->line_offset, '\n', bytes_read);
 346
 347         while (str != NULL) {
 348                 char *start = session->current_line;
 349                 unsigned int code;
 350
 351                 *str = '\0';
 352                 count = strlen(start);
 353                 if (count > 0 && start[count - 1] == '\r') {
 354                         start[--count] = '\0';
 355                         consumed++;
 356                 }
 357
 358                 session->current_line = str + 1;
 359                 consumed += count + 1;
 360
 361                 if (count == 0) {
 362                         const void *ptr = session->current_line;
 363                         session->current_line[bytes_read - consumed] = '\0';
 364                         session->header_done = TRUE;
 365                         session->result.buffer = ptr;
 366                         session->result.length = bytes_read - consumed;
 367                         call_result_func(session, 100);
 368                         break;
 369                 }
 370
 371                 //printf("[ %s ]\n", start);
 372
 373                 if (session->result.status == 0) {
 374                         if (sscanf(start, "HTTP/%*s %u %*s", &code) == 1)
 375                                 session->result.status = code;
 376                 }
 377
 378                 str = memchr(session->current_line, '\n',
 379                                         bytes_read - consumed);
 380         }
 381
 382         if (session->header_done == TRUE) {
 383                 gsize size = session->line_offset - session->line_buffer;
 384
 385                 session->line_offset = session->line_buffer;
 386                 session->line_space += size;
 387
 388                 session->result.buffer = (const guint8 *) session->line_offset;
 389                 return TRUE;
 390         }
 391
 392         session->line_offset += bytes_read;
 393         session->line_space -= bytes_read;
 394
 395         if (session->line_space < 32) {
 396                 gsize size = session->line_offset - session->line_buffer;
 397                 gsize pos = session->current_line - session->line_buffer;
 398                 char *buf;
 399
 400                 printf("realloc, space %u size %zu\n",
 401                                         session->line_space, size);
 402
 403                 buf = g_try_realloc(session->line_buffer,
 404                                                 size + LINE_CHUNK_SIZE);
 405                 if (buf != NULL) {
 406                         session->line_buffer = buf;
 407                         session->line_offset = buf + size;
 408                         session->line_space = LINE_CHUNK_SIZE;
 409                         session->current_line = buf + pos;
 410                 }
 411         }
 412
 413         return TRUE;
 414 }
 415
 416 static int connect_session_transport(struct web_session *session)
 417 {
 418         struct sockaddr_in sin;
 419         int sk;
 420
 421         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 422         if (sk < 0)
 423                 return -EIO;
 424
 425         memset(&sin, 0, sizeof(sin));
 426         sin.sin_family = AF_INET;
 427         sin.sin_port = htons(session->port);
 428         sin.sin_addr.s_addr = inet_addr(session->address);
 429
 430         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 431                 close(sk);
 432                 return -EIO;
 433         }
 434
 435         if (session->flags & SESSION_FLAG_USE_TLS)
 436                 session->transport_channel = g_io_channel_gnutls_new(sk);
 437         else
 438                 session->transport_channel = g_io_channel_unix_new(sk);
 439
 440         if (session->transport_channel == NULL) {
 441                 close(sk);
 442                 return -ENOMEM;
 443         }
 444
 445         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 446         g_io_channel_set_buffered(session->transport_channel, FALSE);
 447
 448         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 449
 450         session->transport_watch = g_io_add_watch(session->transport_channel,
 451                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 452                                                 received_data, session);
 453
 454         return 0;
 455 }
 456
 457 static int create_transport(struct web_session *session)
 458 {
 459         int err;
 460
 461         err = connect_session_transport(session);
 462         if (err < 0)
 463                 return err;
 464
 465         debug(session->web, "creating session %s:%u",
 466                                         session->address, session->port);
 467
 468         return 0;
 469 }
 470
 471 static void start_request(struct web_session *session)
 472 {
 473         GString *buf;
 474         gchar *str;
 475         gsize count, bytes_written;
 476         GIOStatus status;
 477
 478         debug(session->web, "request %s from %s",
 479                                         session->request, session->host);
 480
 481         buf = g_string_new(NULL);
 482         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 483         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 484         if (session->web->user_agent != NULL)
 485                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 486                                                 session->web->user_agent);
 487         if (session->web->accept_option != NULL)
 488                 g_string_append_printf(buf, "Accept: %s\r\n",
 489                                                 session->web->accept_option);
 490         if (session->web->close_connection == TRUE)
 491                 g_string_append(buf, "Connection: close\r\n");
 492         g_string_append(buf, "\r\n");
 493         str = g_string_free(buf, FALSE);
 494
 495         count = strlen(str);
 496
 497         debug(session->web, "bytes to write %zu", count);
 498
 499         status = g_io_channel_write_chars(session->transport_channel,
 500                                         str, count, &bytes_written, NULL);
 501
 502         debug(session->web, "status %u bytes written %zu",
 503                                                 status, bytes_written);
 504
 505         //printf("%s", str);
 506
 507         g_free(str);
 508 }
 509
 510 static int parse_url(struct web_session *session, const char *url)
 511 {
 512         char *scheme, *host, *port, *path;
 513
 514         scheme = g_strdup(url);
 515         if (scheme == NULL)
 516                 return -EINVAL;
 517
 518         host = strstr(scheme, "://");
 519         if (host != NULL) {
 520                 *host = '\0';
 521                 host += 3;
 522
 523                 if (strcasecmp(scheme, "https") == 0) {
 524                         session->port = 443;
 525                         session->flags |= SESSION_FLAG_USE_TLS;
 526                 } else if (strcasecmp(scheme, "http") == 0) {
 527                         session->port = 80;
 528                 } else {
 529                         g_free(scheme);
 530                         return -EINVAL;
 531                 }
 532         } else {
 533                 host = scheme;
 534                 session->port = 80;
 535         }
 536
 537         path = strchr(host, '/');
 538         if (path != NULL)
 539                 *(path++) = '\0';
 540
 541         session->request = g_strdup_printf("/%s", path ? path : "");
 542
 543         port = strrchr(host, ':');
 544         if (port != NULL) {
 545                 char *end;
 546                 int tmp = strtol(port + 1, &end, 10);
 547
 548                 if (*end == '\0') {
 549                         *port = '\0';
 550                         session->port = tmp;
 551                 }
 552         }
 553
 554         session->host = g_strdup(host);
 555
 556         g_free(scheme);
 557
 558         return 0;
 559 }
 560
 561 static void resolv_result(GResolvResultStatus status,
 562                                         char **results, gpointer user_data)
 563 {
 564         struct web_session *session = user_data;
 565
 566         if (results == NULL || results[0] == NULL) {
 567                 call_result_func(session, 404);
 568                 return;
 569         }
 570
 571         debug(session->web, "address %s", results[0]);
 572
 573         if (inet_aton(results[0], NULL) == 0) {
 574                 call_result_func(session, 400);
 575                 return;
 576         }
 577
 578         session->address = g_strdup(results[0]);
 579
 580         if (create_transport(session) < 0) {
 581                 call_result_func(session, 409);
 582                 return;
 583         }
 584
 585         start_request(session);
 586 }
 587
 588 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 589                                 GWebResultFunc func, gpointer user_data)
 590 {
 591         struct web_session *session;
 592
 593         if (web == NULL || url == NULL)
 594                 return 0;
 595
 596         debug(web, "request %s", url);
 597
 598         session = g_try_new0(struct web_session, 1);
 599         if (session == NULL)
 600                 return 0;
 601
 602         if (parse_url(session, url) < 0) {
 603                 free_session(session);
 604                 return 0;
 605         }
 606
 607         debug(web, "host %s:%u", session->host, session->port);
 608         debug(web, "flags %lu", session->flags);
 609
 610         session->web = web;
 611
 612         session->result_func = func;
 613         session->result_data = user_data;
 614
 615         session->line_buffer = g_try_malloc(LINE_CHUNK_SIZE);
 616         session->line_offset = session->line_buffer;
 617         session->line_space = LINE_CHUNK_SIZE;
 618         session->current_line = session->line_buffer;
 619         session->header_done = FALSE;
 620
 621         if (inet_aton(session->host, NULL) == 0) {
 622                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 623                                         session->host, resolv_result, session);
 624                 if (session->resolv_action == 0) {
 625                         free_session(session);
 626                         return 0;
 627                 }
 628         } else {
 629                 session->address = g_strdup(session->host);
 630
 631                 if (create_transport(session) < 0) {
 632                         free_session(session);
 633                         return 0;
 634                 }
 635
 636                 start_request(session);
 637         }
 638
 639         web->session_list = g_list_append(web->session_list, session);
 640
 641         return web->next_query_id++;
 642 }
 643
 644 guint16 g_web_result_get_status(GWebResult *result)
 645 {
 646         if (result == NULL)
 647                 return 0;
 648
 649         return result->status;
 650 }
 651
 652 gboolean g_web_result_get_chunk(GWebResult *result,
 653                                 const guint8 **chunk, gsize *length)
 654 {
 655         if (result == NULL)
 656                 return FALSE;
 657
 658         if (chunk == NULL)
 659                 return FALSE;
 660
 661         *chunk = result->buffer;
 662
 663         if (length != NULL)
 664                 *length = result->length;
 665
 666         return TRUE;
 667 }