1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2005 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 *****************************************************************************/
39 /* FIXME: rwlock on acl, but libvlc doesn't implement rwlock */
40 typedef struct vlc_acl_entry_t
43 uint8_t i_bytes_match;
50 vlc_object_t *p_owner;
52 vlc_acl_entry_t *p_entries;
53 vlc_bool_t b_allow_default;
56 static int ACL_Resolve( vlc_object_t *p_this, uint8_t *p_bytes,
59 struct addrinfo hints = { 0 }, *res;
62 hints.ai_socktype = SOCK_STREAM; /* doesn't matter */
63 hints.ai_flags = AI_NUMERICHOST;
65 if( vlc_getaddrinfo( p_this, psz_ip, 0, &hints, &res ) )
67 msg_Err( p_this, "invalid IP address %s", psz_ip );
71 p_bytes[16] = 0; /* avoids overflowing when i_bytes_match = 16 */
73 i_family = res->ai_addr->sa_family;
78 struct sockaddr_in *addr;
80 addr = (struct sockaddr_in *)res->ai_addr;
81 memset( p_bytes, 0, 12 );
82 memcpy( p_bytes + 12, &addr->sin_addr, 4 );
86 #if defined (HAVE_GETADDRINFO) || defined (WIN32)
87 /* unfortunately many people define AF_INET6
88 though they don't have struct sockaddr_in6 */
91 struct sockaddr_in6 *addr;
93 addr = (struct sockaddr_in6 *)res->ai_addr;
94 memcpy( p_bytes, &addr->sin6_addr, 16 );
100 msg_Err( p_this, "unknown address family" );
101 vlc_freeaddrinfo( res );
105 vlc_freeaddrinfo( res );
111 * Returns 0 if allowed, 1 if not, -1 on error.
113 int ACL_Check( vlc_acl_t *p_acl, const char *psz_ip )
115 const vlc_acl_entry_t *p_cur, *p_end;
121 p_cur = p_acl->p_entries;
122 p_end = p_cur + p_acl->i_size;
124 if( ACL_Resolve( p_acl->p_owner, host, psz_ip ) < 0 )
127 while (p_cur < p_end)
131 i = p_cur->i_bytes_match;
132 if( (memcmp( p_cur->host, host, i ) == 0)
133 && (((p_cur->host[i] ^ host[i]) & p_cur->i_bits_mask) == 0) )
134 return !p_cur->b_allow;
139 return !p_acl->b_allow_default;
142 int ACL_AddNet( vlc_acl_t *p_acl, const char *psz_ip, int i_len,
145 vlc_acl_entry_t *p_ent;
150 i_size = p_acl->i_size;
151 p_ent = (vlc_acl_entry_t *)realloc( p_acl->p_entries,
152 ++p_acl->i_size * sizeof( *p_ent ) );
157 p_acl->p_entries = p_ent;
160 i_family = ACL_Resolve( p_acl->p_owner, p_ent->host, psz_ip );
164 * I'm lazy : memory space will be re-used in the next ACL_Add call...
173 if( i_family == AF_INET )
183 i_len = 128; /* ACL_AddHost */
186 p_ent->i_bytes_match = d.quot;
187 p_ent->i_bits_mask = 0xff << (8 - d.rem);
189 p_ent->b_allow = b_allow;
194 vlc_acl_t *__ACL_Create( vlc_object_t *p_this, vlc_bool_t b_allow )
198 p_acl = (vlc_acl_t *)malloc( sizeof( *p_acl ) );
202 vlc_object_yield( p_this );
203 p_acl->p_owner = p_this;
205 p_acl->p_entries = NULL;
206 p_acl->b_allow_default = b_allow;
212 vlc_acl_t *__ACL_Duplicate( vlc_object_t *p_this, const vlc_acl_t *p_acl )
219 p_dupacl = (vlc_acl_t *)malloc( sizeof( *p_dupacl ) );
220 if( p_dupacl == NULL )
225 p_dupacl->p_entries = (vlc_acl_entry_t *)
226 malloc( p_acl->i_size * sizeof( vlc_acl_entry_t ) );
228 if( p_dupacl->p_entries == NULL )
234 memcpy( p_dupacl->p_entries, p_acl->p_entries,
235 p_acl->i_size * sizeof( vlc_acl_entry_t ) );
238 p_dupacl->p_entries = NULL;
240 vlc_object_yield( p_this );
241 p_dupacl->p_owner = p_this;
242 p_dupacl->i_size = p_acl->i_size;
243 p_dupacl->b_allow_default = p_acl->b_allow_default;
249 void ACL_Destroy( vlc_acl_t *p_acl )
253 if( p_acl->p_entries != NULL )
254 free( p_acl->p_entries );
256 vlc_object_release( p_acl->p_owner );
262 # define isblank(c) ((c) == ' ' || (c) == '\t')
265 int ACL_LoadFile( vlc_acl_t *p_acl, const char *psz_path )
272 file = utf8_fopen( psz_path, "r" );
276 msg_Dbg( p_acl->p_owner, "find .hosts in dir=%s", psz_path );
278 while( !feof( file ) )
280 char line[1024], *psz_ip, *ptr;
282 if( fgets( line, sizeof( line ), file ) == NULL )
286 msg_Err( p_acl->p_owner, "error reading %s : %s\n", psz_path,
293 /* fgets() is cool : never overflow, always nul-terminate */
296 /* skips blanks - cannot overflow given '\0' is not space */
297 while( isspace( *psz_ip ) )
300 if( *psz_ip == '\0' ) /* empty/blank line */
303 ptr = strchr( psz_ip, '\n' );
306 msg_Warn( p_acl->p_owner, "skipping overly long line in %s\n",
310 fgets( line, sizeof( line ), file );
311 if( ferror( file ) || feof( file ) )
313 msg_Err( p_acl->p_owner, "error reading %s : %s\n",
314 psz_path, strerror( errno ) );
318 while( strchr( line, '\n' ) == NULL);
320 continue; /* skip unusable line */
323 /* skips comment-only line */
327 /* looks for first space, CR, LF, etc. or end-of-line comment */
328 /* (there is at least a linefeed) */
329 for( ptr = psz_ip; ( *ptr != '#' ) && !isspace( *ptr ); ptr++ );
333 msg_Dbg( p_acl->p_owner, "restricted to %s", psz_ip );
335 ptr = strchr( psz_ip, '/' );
337 *ptr++ = '\0'; /* separate address from mask length */
340 ? ACL_AddNet( p_acl, psz_ip, atoi( ptr ), VLC_TRUE )
341 : ACL_AddHost( p_acl, psz_ip, VLC_TRUE ) )
343 msg_Err( p_acl->p_owner, "cannot add ACL from %s", psz_path );