1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright © 2005-2007 Rémi Denis-Courmont
7 * Authors: Rémi Denis-Courmont <rem # videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
34 #include <vlc_network.h>
35 #include <vlc_charset.h>
37 /* FIXME: rwlock on acl, but libvlc doesn't implement rwlock */
38 typedef struct vlc_acl_entry_t
41 uint8_t i_bytes_match;
48 vlc_object_t *p_owner;
50 vlc_acl_entry_t *p_entries;
51 vlc_bool_t b_allow_default;
54 static int ACL_Resolve( vlc_object_t *p_this, uint8_t *p_bytes,
57 struct addrinfo hints, *res;
60 memset (&hints, 0, sizeof (hints));
61 hints.ai_socktype = SOCK_STREAM; /* doesn't matter */
62 hints.ai_flags = AI_NUMERICHOST;
64 if( vlc_getaddrinfo( p_this, psz_ip, 0, &hints, &res ) )
66 msg_Err( p_this, "invalid IP address %s", psz_ip );
70 p_bytes[16] = 0; /* avoids overflowing when i_bytes_match = 16 */
72 i_family = res->ai_addr->sa_family;
77 struct sockaddr_in *addr;
79 addr = (struct sockaddr_in *)res->ai_addr;
80 memset( p_bytes, 0, 12 );
81 memcpy( p_bytes + 12, &addr->sin_addr, 4 );
85 #if defined (HAVE_GETADDRINFO) || defined (WIN32)
86 /* unfortunately many people define AF_INET6
87 though they don't have struct sockaddr_in6 */
90 struct sockaddr_in6 *addr;
92 addr = (struct sockaddr_in6 *)res->ai_addr;
93 memcpy( p_bytes, &addr->sin6_addr, 16 );
99 msg_Err( p_this, "unknown address family" );
100 vlc_freeaddrinfo( res );
104 vlc_freeaddrinfo( res );
110 * Check if a given address passes an access control list.
112 * @param p_acl pre-existing ACL to match the address against
113 * @param psz_ip numeric IPv4/IPv6 address
115 * @return 0 if the first matching ACL entry is an access grant,
116 * 1 if the first matching ACL entry is a denial of access,
119 int ACL_Check( vlc_acl_t *p_acl, const char *psz_ip )
121 const vlc_acl_entry_t *p_cur, *p_end;
127 p_cur = p_acl->p_entries;
128 p_end = p_cur + p_acl->i_size;
130 if( ACL_Resolve( p_acl->p_owner, host, psz_ip ) < 0 )
133 while (p_cur < p_end)
137 i = p_cur->i_bytes_match;
138 if( (memcmp( p_cur->host, host, i ) == 0)
139 && (((p_cur->host[i] ^ host[i]) & p_cur->i_bits_mask) == 0) )
140 return !p_cur->b_allow;
145 return !p_acl->b_allow_default;
149 * Adds an item to an ACL.
150 * Items are always matched in the same order as they are added.
152 int ACL_AddNet( vlc_acl_t *p_acl, const char *psz_ip, int i_len,
155 vlc_acl_entry_t *p_ent;
160 i_size = p_acl->i_size;
161 p_ent = (vlc_acl_entry_t *)realloc( p_acl->p_entries,
162 ++p_acl->i_size * sizeof( *p_ent ) );
167 p_acl->p_entries = p_ent;
170 i_family = ACL_Resolve( p_acl->p_owner, p_ent->host, psz_ip );
174 * I'm lazy : memory space will be re-used in the next ACL_Add call...
183 if( i_family == AF_INET )
193 i_len = 128; /* ACL_AddHost */
196 p_ent->i_bytes_match = d.quot;
197 p_ent->i_bits_mask = 0xff << (8 - d.rem);
199 p_ent->b_allow = b_allow;
205 * Creates an empty ACL.
207 * @param b_allow whether to grant (VLC_TRUE) or deny (VLC_FALSE) access
208 * by default (ie if none of the ACL entries matched).
210 * @return an ACL object. NULL in case of error.
212 vlc_acl_t *__ACL_Create( vlc_object_t *p_this, vlc_bool_t b_allow )
216 p_acl = (vlc_acl_t *)malloc( sizeof( *p_acl ) );
220 vlc_object_yield( p_this );
221 p_acl->p_owner = p_this;
223 p_acl->p_entries = NULL;
224 p_acl->b_allow_default = b_allow;
231 * Perform a deep copy of an existing ACL.
233 * @param p_this object to attach the copy to.
234 * @param p_acl ACL object to be copied.
236 * @return a new ACL object, or NULL on error.
238 vlc_acl_t *__ACL_Duplicate( vlc_object_t *p_this, const vlc_acl_t *p_acl )
245 p_dupacl = (vlc_acl_t *)malloc( sizeof( *p_dupacl ) );
246 if( p_dupacl == NULL )
251 p_dupacl->p_entries = (vlc_acl_entry_t *)
252 malloc( p_acl->i_size * sizeof( vlc_acl_entry_t ) );
254 if( p_dupacl->p_entries == NULL )
260 memcpy( p_dupacl->p_entries, p_acl->p_entries,
261 p_acl->i_size * sizeof( vlc_acl_entry_t ) );
264 p_dupacl->p_entries = NULL;
266 vlc_object_yield( p_this );
267 p_dupacl->p_owner = p_this;
268 p_dupacl->i_size = p_acl->i_size;
269 p_dupacl->b_allow_default = p_acl->b_allow_default;
276 * Releases all resources associated with an ACL object.
278 void ACL_Destroy( vlc_acl_t *p_acl )
282 if( p_acl->p_entries != NULL )
283 free( p_acl->p_entries );
285 vlc_object_release( p_acl->p_owner );
292 * Reads ACL entries from a file.
294 * @param p_acl ACL object in which to insert parsed entries.
295 * @param psz_patch filename from which to parse entries.
297 * @return 0 on success, -1 on error.
299 int ACL_LoadFile( vlc_acl_t *p_acl, const char *psz_path )
306 file = utf8_fopen( psz_path, "r" );
310 msg_Dbg( p_acl->p_owner, "find .hosts in dir=%s", psz_path );
312 while( !feof( file ) )
314 char line[1024], *psz_ip, *ptr;
316 if( fgets( line, sizeof( line ), file ) == NULL )
320 msg_Err( p_acl->p_owner, "error reading %s : %s\n", psz_path,
327 /* fgets() is cool : never overflow, always nul-terminate */
330 /* skips blanks - cannot overflow given '\0' is not space */
331 while( isspace( *psz_ip ) )
334 if( *psz_ip == '\0' ) /* empty/blank line */
337 ptr = strchr( psz_ip, '\n' );
340 msg_Warn( p_acl->p_owner, "skipping overly long line in %s\n",
344 if( fgets( line, sizeof( line ), file ) == NULL )
348 msg_Err( p_acl->p_owner, "error reading %s : %s\n",
349 psz_path, strerror( errno ) );
354 while( strchr( line, '\n' ) == NULL);
356 continue; /* skip unusable line */
359 /* skips comment-only line */
363 /* looks for first space, CR, LF, etc. or end-of-line comment */
364 /* (there is at least a linefeed) */
365 for( ptr = psz_ip; ( *ptr != '#' ) && !isspace( *ptr ); ptr++ );
369 msg_Dbg( p_acl->p_owner, "restricted to %s", psz_ip );
371 ptr = strchr( psz_ip, '/' );
373 *ptr++ = '\0'; /* separate address from mask length */
376 ? ACL_AddNet( p_acl, psz_ip, atoi( ptr ), VLC_TRUE )
377 : ACL_AddHost( p_acl, psz_ip, VLC_TRUE ) )
379 msg_Err( p_acl->p_owner, "cannot add ACL from %s", psz_path );