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 SESSION_FLAG_USE_TLS    (1 << 0)
  40
  41 struct _GWebResult {
  42 };
  43
  44 struct web_session {
  45         GWeb *web;
  46
  47         char *address;
  48         char *host;
  49         uint16_t port;
  50         unsigned long flags;
  51
  52         GIOChannel *transport_channel;
  53         guint transport_watch;
  54
  55         guint resolv_action;
  56         char *request;
  57
  58         GWebResult *result;
  59
  60         GWebResultFunc result_func;
  61         gpointer result_data;
  62 };
  63
  64 struct _GWeb {
  65         gint ref_count;
  66
  67         guint next_query_id;
  68
  69         int index;
  70         GList *session_list;
  71
  72         GResolv *resolv;
  73         char *accept_option;
  74         char *user_agent;
  75
  76         GWebDebugFunc debug_func;
  77         gpointer debug_data;
  78 };
  79
  80 static inline void debug(GWeb *web, const char *format, ...)
  81 {
  82         char str[256];
  83         va_list ap;
  84
  85         if (web->debug_func == NULL)
  86                 return;
  87
  88         va_start(ap, format);
  89
  90         if (vsnprintf(str, sizeof(str), format, ap) > 0)
  91                 web->debug_func(str, web->debug_data);
  92
  93         va_end(ap);
  94 }
  95
  96 static void free_session(struct web_session *session)
  97 {
  98         GWeb *web = session->web;
  99
 100         if (session == NULL)
 101                 return;
 102
 103         g_free(session->request);
 104
 105         if (session->resolv_action > 0)
 106                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 107
 108         if (session->transport_watch > 0)
 109                 g_source_remove(session->transport_watch);
 110
 111         if (session->transport_channel != NULL)
 112                 g_io_channel_unref(session->transport_channel);
 113
 114         g_free(session->host);
 115         g_free(session->address);
 116         g_free(session);
 117 }
 118
 119 static void flush_sessions(GWeb *web)
 120 {
 121         GList *list;
 122
 123         for (list = g_list_first(web->session_list);
 124                                         list; list = g_list_next(list))
 125                 free_session(list->data);
 126
 127         g_list_free(web->session_list);
 128         web->session_list = NULL;
 129 }
 130
 131 GWeb *g_web_new(int index)
 132 {
 133         GWeb *web;
 134
 135         if (index < 0)
 136                 return NULL;
 137
 138         web = g_try_new0(GWeb, 1);
 139         if (web == NULL)
 140                 return NULL;
 141
 142         web->ref_count = 1;
 143
 144         web->next_query_id = 1;
 145
 146         web->index = index;
 147         web->session_list = NULL;
 148
 149         web->resolv = g_resolv_new(index);
 150         if (web->resolv == NULL) {
 151                 g_free(web);
 152                 return NULL;
 153         }
 154
 155         web->accept_option = g_strdup("*/*");
 156         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 157
 158         return web;
 159 }
 160
 161 GWeb *g_web_ref(GWeb *web)
 162 {
 163         if (web == NULL)
 164                 return NULL;
 165
 166         g_atomic_int_inc(&web->ref_count);
 167
 168         return web;
 169 }
 170
 171 void g_web_unref(GWeb *web)
 172 {
 173         if (web == NULL)
 174                 return;
 175
 176         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 177                 return;
 178
 179         flush_sessions(web);
 180
 181         g_resolv_unref(web->resolv);
 182
 183         g_free(web->accept_option);
 184         g_free(web->user_agent);
 185         g_free(web);
 186 }
 187
 188 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 189 {
 190         if (web == NULL)
 191                 return;
 192
 193         web->debug_func = func;
 194         web->debug_data = user_data;
 195
 196         g_resolv_set_debug(web->resolv, func, user_data);
 197 }
 198
 199 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 200 {
 201         if (web == NULL)
 202                 return FALSE;
 203
 204         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 205
 206         return TRUE;
 207 }
 208
 209 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 210 {
 211         g_free(web->accept_option);
 212
 213         if (format == NULL) {
 214                 web->accept_option = NULL;
 215                 debug(web, "clearing accept option");
 216         } else {
 217                 web->accept_option = g_strdup_vprintf(format, args);
 218                 debug(web, "setting accept %s", web->accept_option);
 219         }
 220
 221         return TRUE;
 222 }
 223
 224 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 225 {
 226         va_list args;
 227         gboolean result;
 228
 229         if (web == NULL)
 230                 return FALSE;
 231
 232         va_start(args, format);
 233         result = set_accept_option(web, format, args);
 234         va_end(args);
 235
 236         return result;
 237 }
 238
 239 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 240 {
 241         g_free(web->user_agent);
 242
 243         if (format == NULL) {
 244                 web->user_agent = NULL;
 245                 debug(web, "clearing user agent");
 246         } else {
 247                 web->user_agent = g_strdup_vprintf(format, args);
 248                 debug(web, "setting user agent %s", web->user_agent);
 249         }
 250
 251         return TRUE;
 252 }
 253
 254 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 255 {
 256         va_list args;
 257         gboolean result;
 258
 259         if (web == NULL)
 260                 return FALSE;
 261
 262         va_start(args, format);
 263         result = set_user_agent(web, format, args);
 264         va_end(args);
 265
 266         return result;
 267 }
 268
 269 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 270                                                         gpointer user_data)
 271 {
 272         struct web_session *session = user_data;
 273         gchar buf[4096];
 274         gsize bytes_read;
 275         GIOStatus status;
 276
 277         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 278                 session->transport_watch = 0;
 279                 if (session->result_func != NULL)
 280                         session->result_func(400, NULL, session->result_data);
 281                 return FALSE;
 282         }
 283
 284         memset(buf, 0, sizeof(buf));
 285         status = g_io_channel_read_chars(channel, buf, sizeof(buf) - 1,
 286                                                 &bytes_read, NULL);
 287
 288         debug(session->web, "status %u bytes read %zu", status, bytes_read);
 289
 290         if (status != G_IO_STATUS_NORMAL) {
 291                 session->transport_watch = 0;
 292                 if (session->result_func != NULL)
 293                         session->result_func(200, NULL, session->result_data);
 294                 return FALSE;
 295         }
 296
 297         printf("%s", buf);
 298
 299         return TRUE;
 300 }
 301
 302 static int connect_session_transport(struct web_session *session)
 303 {
 304         struct sockaddr_in sin;
 305         int sk;
 306
 307         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 308         if (sk < 0)
 309                 return -EIO;
 310
 311         memset(&sin, 0, sizeof(sin));
 312         sin.sin_family = AF_INET;
 313         sin.sin_port = htons(session->port);
 314         sin.sin_addr.s_addr = inet_addr(session->address);
 315
 316         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 317                 close(sk);
 318                 return -EIO;
 319         }
 320
 321         debug(session->web, "flags %lu", session->flags);
 322
 323         if (session->flags & SESSION_FLAG_USE_TLS)
 324                 session->transport_channel = g_io_channel_gnutls_new(sk);
 325         else
 326                 session->transport_channel = g_io_channel_unix_new(sk);
 327
 328         if (session->transport_channel == NULL) {
 329                 close(sk);
 330                 return -ENOMEM;
 331         }
 332
 333         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 334         g_io_channel_set_buffered(session->transport_channel, FALSE);
 335
 336         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 337
 338         session->transport_watch = g_io_add_watch(session->transport_channel,
 339                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 340                                                 received_data, session);
 341
 342         return 0;
 343 }
 344
 345 static void start_request(struct web_session *session)
 346 {
 347         GString *buf;
 348         gchar *str;
 349         gsize count, bytes_written;
 350         GIOStatus status;
 351
 352         debug(session->web, "request %s from %s",
 353                                         session->request, session->host);
 354
 355         buf = g_string_new(NULL);
 356         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 357         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 358         if (session->web->user_agent != NULL)
 359                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 360                                                 session->web->user_agent);
 361         if (session->web->accept_option != NULL)
 362                 g_string_append_printf(buf, "Accept: %s\r\n",
 363                                                 session->web->accept_option);
 364         g_string_append(buf, "\r\n");
 365         str = g_string_free(buf, FALSE);
 366
 367         count = strlen(str);
 368
 369         debug(session->web, "bytes to write %zu", count);
 370
 371         status = g_io_channel_write_chars(session->transport_channel,
 372                                         str, count, &bytes_written, NULL);
 373
 374         debug(session->web, "status %u bytes written %zu",
 375                                                 status, bytes_written);
 376
 377         printf("%s", str);
 378
 379         g_free(str);
 380 }
 381
 382 static int parse_url(struct web_session *session, const char *url)
 383 {
 384         char *scheme, *host, *port, *path;
 385
 386         scheme = g_strdup(url);
 387         if (scheme == NULL)
 388                 return -EINVAL;
 389
 390         host = strstr(scheme, "://");
 391         if (host != NULL) {
 392                 *host = '\0';
 393                 host += 3;
 394
 395                 if (strcasecmp(scheme, "https") == 0) {
 396                         session->port = 443;
 397                         session->flags |= SESSION_FLAG_USE_TLS;
 398                 } else if (strcasecmp(scheme, "http") == 0) {
 399                         session->port = 80;
 400                 } else {
 401                         g_free(scheme);
 402                         return -EINVAL;
 403                 }
 404         } else {
 405                 host = scheme;
 406                 session->port = 80;
 407         }
 408
 409         path = strchr(host, '/');
 410         if (path != NULL)
 411                 *(path++) = '\0';
 412
 413         session->request = g_strdup_printf("/%s", path ? path : "");
 414
 415         port = strrchr(host, ':');
 416         if (port != NULL) {
 417                 char *end;
 418                 int tmp = strtol(port + 1, &end, 10);
 419
 420                 if (*end == '\0') {
 421                         *port = '\0';
 422                         session->port = tmp;
 423                 }
 424         }
 425
 426         session->host = g_strdup(host);
 427
 428         g_free(scheme);
 429
 430         return 0;
 431 }
 432
 433 static void resolv_result(GResolvResultStatus status,
 434                                         char **results, gpointer user_data)
 435 {
 436         struct web_session *session = user_data;
 437
 438         if (results == NULL || results[0] == NULL) {
 439                 if (session->result_func != NULL)
 440                         session->result_func(404, NULL, session->result_data);
 441                 return;
 442         }
 443
 444         debug(session->web, "address %s", results[0]);
 445
 446         if (inet_aton(results[0], NULL) == 0) {
 447                 if (session->result_func != NULL)
 448                         session->result_func(400, NULL, session->result_data);
 449                 return;
 450         }
 451
 452         session->address = g_strdup(results[0]);
 453
 454         if (connect_session_transport(session) < 0) {
 455                 if (session->result_func != NULL)
 456                         session->result_func(409, NULL, session->result_data);
 457                 return;
 458         }
 459
 460         debug(session->web, "creating session %s:%u",
 461                                         session->address, session->port);
 462
 463         start_request(session);
 464 }
 465
 466 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 467                                 GWebResultFunc func, gpointer user_data)
 468 {
 469         struct web_session *session;
 470
 471         if (web == NULL || url == NULL)
 472                 return 0;
 473
 474         debug(web, "request %s", url);
 475
 476         session = g_try_new0(struct web_session, 1);
 477         if (session == NULL)
 478                 return 0;
 479
 480         if (parse_url(session, url) < 0) {
 481                 free_session(session);
 482                 return 0;
 483         }
 484
 485         debug(web, "host %s:%u", session->host, session->port);
 486         debug(web, "flags %lu", session->flags);
 487
 488         session->web = web;
 489
 490         session->result_func = func;
 491         session->result_data = user_data;
 492
 493         session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 494                                         session->host, resolv_result, session);
 495         if (session->resolv_action == 0) {
 496                 free_session(session);
 497                 return 0;
 498         }
 499
 500         web->session_list = g_list_append(web->session_list, session);
 501
 502         return web->next_query_id++;
 503 }