1 /*****************************************************************************
2 * getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
3 *****************************************************************************
4 * Copyright (C) 2005 the VideoLAN team
5 * Copyright (C) 2002-2007 Rémi Denis-Courmont
8 * Author: Rémi Denis-Courmont <rem # videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
29 #include <vlc_common.h>
30 #include <vlc_charset.h>
32 #include <stddef.h> /* size_t */
33 #include <string.h> /* strlen(), memcpy(), memset(), strchr() */
34 #include <stdlib.h> /* malloc(), free(), strtoul() */
38 #include <sys/types.h>
39 #include <vlc_network.h>
45 int vlc_getnameinfo( const struct sockaddr *sa, int salen,
46 char *host, int hostlen, int *portnum, int flags )
48 char psz_servbuf[6], *psz_serv;
51 flags |= NI_NUMERICSERV;
54 psz_serv = psz_servbuf;
55 i_servlen = sizeof( psz_servbuf );
63 i_val = getnameinfo(sa, salen, host, hostlen, psz_serv, i_servlen, flags);
66 *portnum = atoi( psz_serv );
73 * Resolves a host name to a list of socket addresses (like getaddrinfo()).
75 * @param p_this a VLC object
76 * @param node host name to resolve (encoded as UTF-8), or NULL
77 * @param i_port port number for the socket addresses
78 * @param p_hints parameters (see getaddrinfo() manual page)
79 * @param res pointer set to the resulting chained list.
80 * @return 0 on success, a getaddrinfo() error otherwise.
81 * On failure, *res is undefined. On success, it must be freed with
84 int vlc_getaddrinfo( vlc_object_t *p_this, const char *node,
85 int i_port, const struct addrinfo *p_hints,
86 struct addrinfo **res )
88 struct addrinfo hints;
89 char psz_buf[NI_MAXHOST], psz_service[6];
92 * In VLC, we always use port number as integer rather than strings
93 * for historical reasons (and portability).
95 if( ( i_port > 65535 ) || ( i_port < 0 ) )
97 msg_Err( p_this, "invalid port number %d specified", i_port );
101 /* cannot overflow */
102 snprintf( psz_service, 6, "%d", i_port );
104 /* Check if we have to force ipv4 or ipv6 */
105 memset (&hints, 0, sizeof (hints));
108 const int safe_flags =
124 hints.ai_family = p_hints->ai_family;
125 hints.ai_socktype = p_hints->ai_socktype;
126 hints.ai_protocol = p_hints->ai_protocol;
127 /* Unfortunately, some flags chang the layout of struct addrinfo, so
128 * they cannot be copied blindly from p_hints to &hints. Therefore, we
129 * only copy flags that we know for sure are "safe".
131 hints.ai_flags = p_hints->ai_flags & safe_flags;
134 /* We only ever use port *numbers* */
135 hints.ai_flags |= AI_NUMERICSERV;
139 * - accept "" as NULL
140 * - ignore square brackets
146 size_t len = strlen (node + 1);
147 if ((len <= sizeof (psz_buf)) && (node[len] == ']'))
150 memcpy (psz_buf, node + 1, len - 1);
151 psz_buf[len - 1] = '\0';
160 node = ToLocale (node);
163 * Winsock tries to resolve numerical IPv4 addresses as AAAA
164 * and IPv6 addresses as A... There comes the bug-to-bug fix.
166 if ((hints.ai_flags & AI_NUMERICHOST) == 0)
168 hints.ai_flags |= AI_NUMERICHOST;
169 ret = getaddrinfo (node, psz_service, &hints, res);
172 hints.ai_flags &= ~AI_NUMERICHOST;
176 /* Run-time I18n Domain Names support */
177 hints.ai_flags |= AI_IDN;
178 ret = getaddrinfo (node, psz_service, &hints, res);
179 if (ret != EAI_BADFLAGS)
181 /* IDN not available: disable and retry without it */
182 hints.ai_flags &= ~AI_IDN;
184 ret = getaddrinfo (node, psz_service, &hints, res);
186 #if defined(AI_IDN) || defined(WIN32)
195 * inet_pton() replacement
197 int vlc_inet_pton (int af, const char *src, void *dst)
199 #ifndef HAVE_INET_PTON
200 /* Windows Vista has inet_pton(), but not XP. */
201 /* We have a pretty good example of abstraction inversion here... */
202 struct addrinfo hints = {
204 .ai_socktype = SOCK_DGRAM, /* make sure we have... */
205 .ai_protocol = IPPROTO_UDP, /* ...only one response */
206 .ai_flags = AI_NUMERICHOST,
209 if (getaddrinfo (src, NULL, &hints, &res))
218 data = &((const struct sockaddr_in *)res->ai_addr)->sin_addr;
219 len = sizeof (struct in_addr);
223 data = &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
224 len = sizeof (struct in6_addr);
231 memcpy (dst, data, len);
234 #else /* HAVE_INET_PTON */
235 return inet_pton( af, src, dst );
236 #endif /* HAVE_INET_PTON */
240 * inet_ntop() replacement
242 const char *vlc_inet_ntop (int af, const void *src, char *dst, socklen_t cnt)
244 #ifndef HAVE_INET_NTOP
245 int ret = EAI_FAMILY;
252 struct sockaddr_in6 addr;
253 memset (&addr, 0, sizeof(addr));
254 addr.sin6_family = AF_INET6;
255 addr.sin6_addr = *(struct in6_addr *)src;
256 ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr),
257 dst, cnt, NULL, 0, NI_NUMERICHOST);
263 struct sockaddr_in addr;
264 memset(&addr, 0, sizeof(addr));
265 addr.sin_family = AF_INET;
266 addr.sin_addr = *(struct in_addr *)src;
267 ret = getnameinfo ((struct sockaddr *)&addr, sizeof (addr),
268 dst, cnt, NULL, 0, NI_NUMERICHOST);
271 return (ret == 0) ? dst : NULL;
272 #else /* HAVE_INET_NTOP */
273 return inet_ntop( af, src, dst, cnt );
274 #endif /* HAVE_INET_NTOP */