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
  74         GWebDebugFunc debug_func;
  75         gpointer debug_data;
  76 };
  77
  78 static inline void debug(GWeb *web, const char *format, ...)
  79 {
  80         char str[256];
  81         va_list ap;
  82
  83         if (web->debug_func == NULL)
  84                 return;
  85
  86         va_start(ap, format);
  87
  88         if (vsnprintf(str, sizeof(str), format, ap) > 0)
  89                 web->debug_func(str, web->debug_data);
  90
  91         va_end(ap);
  92 }
  93
  94 static void free_session(struct web_session *session)
  95 {
  96         GWeb *web = session->web;
  97
  98         if (session == NULL)
  99                 return;
 100
 101         g_free(session->request);
 102
 103         if (session->resolv_action > 0)
 104                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 105
 106         if (session->transport_watch > 0)
 107                 g_source_remove(session->transport_watch);
 108
 109         if (session->transport_channel != NULL)
 110                 g_io_channel_unref(session->transport_channel);
 111
 112         g_free(session->host);
 113         g_free(session->address);
 114         g_free(session);
 115 }
 116
 117 static void flush_sessions(GWeb *web)
 118 {
 119         GList *list;
 120
 121         for (list = g_list_first(web->session_list);
 122                                         list; list = g_list_next(list))
 123                 free_session(list->data);
 124
 125         g_list_free(web->session_list);
 126         web->session_list = NULL;
 127 }
 128
 129 GWeb *g_web_new(int index)
 130 {
 131         GWeb *web;
 132
 133         if (index < 0)
 134                 return NULL;
 135
 136         web = g_try_new0(GWeb, 1);
 137         if (web == NULL)
 138                 return NULL;
 139
 140         web->ref_count = 1;
 141
 142         web->next_query_id = 1;
 143
 144         web->index = index;
 145         web->session_list = NULL;
 146
 147         web->resolv = g_resolv_new(index);
 148         if (web->resolv == NULL) {
 149                 g_free(web);
 150                 return NULL;
 151         }
 152
 153         return web;
 154 }
 155
 156 GWeb *g_web_ref(GWeb *web)
 157 {
 158         if (web == NULL)
 159                 return NULL;
 160
 161         g_atomic_int_inc(&web->ref_count);
 162
 163         return web;
 164 }
 165
 166 void g_web_unref(GWeb *web)
 167 {
 168         if (web == NULL)
 169                 return;
 170
 171         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 172                 return;
 173
 174         flush_sessions(web);
 175
 176         g_resolv_unref(web->resolv);
 177
 178         g_free(web);
 179 }
 180
 181 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 182 {
 183         if (web == NULL)
 184                 return;
 185
 186         web->debug_func = func;
 187         web->debug_data = user_data;
 188
 189         g_resolv_set_debug(web->resolv, func, user_data);
 190 }
 191
 192 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 193 {
 194         if (web == NULL)
 195                 return FALSE;
 196
 197         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 198
 199         return TRUE;
 200 }
 201
 202 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 203                                                         gpointer user_data)
 204 {
 205         struct web_session *session = user_data;
 206         gchar buf[4096];
 207         gsize bytes_read;
 208         GIOStatus status;
 209
 210         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 211                 session->transport_watch = 0;
 212                 if (session->result_func != NULL)
 213                         session->result_func(400, NULL, session->result_data);
 214                 return FALSE;
 215         }
 216
 217         memset(buf, 0, sizeof(buf));
 218         status = g_io_channel_read_chars(channel, buf, sizeof(buf) - 1,
 219                                                 &bytes_read, NULL);
 220
 221         debug(session->web, "status %u bytes read %zu", status, bytes_read);
 222
 223         if (bytes_read == 0) {
 224                 session->transport_watch = 0;
 225                 if (session->result_func != NULL)
 226                         session->result_func(200, NULL, session->result_data);
 227                 return FALSE;
 228         }
 229
 230         printf("%s", buf);
 231
 232         return TRUE;
 233 }
 234
 235 static int connect_session_transport(struct web_session *session)
 236 {
 237         struct sockaddr_in sin;
 238         int sk;
 239
 240         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 241         if (sk < 0)
 242                 return -EIO;
 243
 244         memset(&sin, 0, sizeof(sin));
 245         sin.sin_family = AF_INET;
 246         sin.sin_port = htons(session->port);
 247         sin.sin_addr.s_addr = inet_addr(session->address);
 248
 249         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 250                 close(sk);
 251                 return -EIO;
 252         }
 253
 254         debug(session->web, "flags %lu", session->flags);
 255
 256         if (session->flags & SESSION_FLAG_USE_TLS)
 257                 session->transport_channel = g_io_channel_gnutls_new(sk);
 258         else
 259                 session->transport_channel = g_io_channel_unix_new(sk);
 260
 261         if (session->transport_channel == NULL) {
 262                 close(sk);
 263                 return -ENOMEM;
 264         }
 265
 266         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 267
 268         session->transport_watch = g_io_add_watch(session->transport_channel,
 269                                                         G_IO_IN, received_data,
 270                                                                 session);
 271
 272         return 0;
 273 }
 274
 275 static void start_request(struct web_session *session)
 276 {
 277         GString *buf;
 278         gchar *str;
 279         gsize bytes_written;
 280         GIOStatus status;
 281
 282         debug(session->web, "request %s from %s",
 283                                         session->request, session->host);
 284
 285         buf = g_string_new(NULL);
 286         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 287         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 288         g_string_append_printf(buf, "User-Agent: ConnMan/%s\r\n", VERSION);
 289         g_string_append(buf, "Accept: */*\r\n");
 290         g_string_append(buf, "\r\n");
 291         str = g_string_free(buf, FALSE);
 292
 293         status = g_io_channel_write_chars(session->transport_channel,
 294                                 str, strlen(str), &bytes_written, NULL);
 295
 296         debug(session->web, "status %u bytes written %zu",
 297                                                 status, bytes_written);
 298
 299         printf("%s", str);
 300
 301         g_free(str);
 302 }
 303
 304 static int parse_url(struct web_session *session, const char *url)
 305 {
 306         char *scheme, *host, *port, *path;
 307
 308         scheme = g_strdup(url);
 309         if (scheme == NULL)
 310                 return -EINVAL;
 311
 312         host = strstr(scheme, "://");
 313         if (host != NULL) {
 314                 *host = '\0';
 315                 host += 3;
 316
 317                 if (strcasecmp(scheme, "https") == 0) {
 318                         session->port = 443;
 319                         session->flags |= SESSION_FLAG_USE_TLS;
 320                 } else if (strcasecmp(scheme, "http") == 0) {
 321                         session->port = 80;
 322                 } else {
 323                         g_free(scheme);
 324                         return -EINVAL;
 325                 }
 326         } else {
 327                 host = scheme;
 328                 session->port = 80;
 329         }
 330
 331         path = strchr(host, '/');
 332         if (path != NULL)
 333                 *(path++) = '\0';
 334
 335         session->request = g_strdup_printf("/%s", path ? path : "");
 336
 337         port = strrchr(host, ':');
 338         if (port != NULL) {
 339                 char *end;
 340                 int tmp = strtol(port + 1, &end, 10);
 341
 342                 if (*end == '\0') {
 343                         *port = '\0';
 344                         session->port = tmp;
 345                 }
 346         }
 347
 348         session->host = g_strdup(host);
 349
 350         g_free(scheme);
 351
 352         return 0;
 353 }
 354
 355 static void resolv_result(GResolvResultStatus status,
 356                                         char **results, gpointer user_data)
 357 {
 358         struct web_session *session = user_data;
 359
 360         if (results == NULL || results[0] == NULL) {
 361                 if (session->result_func != NULL)
 362                         session->result_func(404, NULL, session->result_data);
 363                 return;
 364         }
 365
 366         debug(session->web, "address %s", results[0]);
 367
 368         if (inet_aton(results[0], NULL) == 0) {
 369                 if (session->result_func != NULL)
 370                         session->result_func(400, NULL, session->result_data);
 371                 return;
 372         }
 373
 374         session->address = g_strdup(results[0]);
 375
 376         if (connect_session_transport(session) < 0) {
 377                 if (session->result_func != NULL)
 378                         session->result_func(409, NULL, session->result_data);
 379                 return;
 380         }
 381
 382         debug(session->web, "creating session %s:%u",
 383                                         session->address, session->port);
 384
 385         start_request(session);
 386 }
 387
 388 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 389                                 GWebResultFunc func, gpointer user_data)
 390 {
 391         struct web_session *session;
 392
 393         if (web == NULL || url == NULL)
 394                 return 0;
 395
 396         debug(web, "request %s", url);
 397
 398         session = g_try_new0(struct web_session, 1);
 399         if (session == NULL)
 400                 return 0;
 401
 402         if (parse_url(session, url) < 0) {
 403                 free_session(session);
 404                 return 0;
 405         }
 406
 407         debug(web, "host %s:%u", session->host, session->port);
 408         debug(web, "flags %lu", session->flags);
 409
 410         session->web = web;
 411
 412         session->result_func = func;
 413         session->result_data = user_data;
 414
 415         session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 416                                         session->host, resolv_result, session);
 417         if (session->resolv_action == 0) {
 418                 free_session(session);
 419                 return 0;
 420         }
 421
 422         web->session_list = g_list_append(web->session_list, session);
 423
 424         return web->next_query_id++;
 425 }