2013-02-13 18:49:33 +01:00
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/* $NetBSD: getnameinfo.c,v 1.53 2012/09/26 23:13:00 christos Exp $ */
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2009-03-04 04:28:35 +01:00
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/* $KAME: getnameinfo.c,v 1.45 2000/09/25 22:43:56 itojun Exp $ */
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/*
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* Copyright (c) 2000 Ben Harris.
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Issues to be discussed:
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* - Thread safe-ness must be checked
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* - RFC2553 says that we should raise error on short buffer. X/Open says
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* we need to truncate the result. We obey RFC2553 (and X/Open should be
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* modified). ipngwg rough consensus seems to follow RFC2553.
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* - What is "local" in NI_FQDN?
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* - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
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* - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
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* sin6_scope_id is filled - standardization status?
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* XXX breaks backward compat for code that expects no scopeid.
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* beware on merge.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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2013-02-13 18:49:33 +01:00
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__RCSID("$NetBSD: getnameinfo.c,v 1.53 2012/09/26 23:13:00 christos Exp $");
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2009-03-04 04:28:35 +01:00
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/socket.h>
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2013-02-13 18:49:33 +01:00
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#include <sys/un.h>
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2009-03-04 04:28:35 +01:00
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#include <net/if.h>
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#include <net/if_ieee1394.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <limits.h>
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#include <netdb.h>
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#ifdef ANDROID_CHANGES
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2013-02-13 18:49:33 +01:00
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#include "arpa_nameser.h"
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2009-03-04 04:28:35 +01:00
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#include "resolv_private.h"
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2011-02-15 08:45:26 +01:00
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#include <sys/system_properties.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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2013-02-13 18:49:33 +01:00
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#define MIN(x,y) ((x) < (y) ? (x) : (y))
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2009-03-04 04:28:35 +01:00
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#else
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#include <resolv.h>
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#endif
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#include <stddef.h>
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#include <string.h>
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static const struct afd {
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int a_af;
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socklen_t a_addrlen;
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socklen_t a_socklen;
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int a_off;
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} afdl [] = {
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#ifdef INET6
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{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
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offsetof(struct sockaddr_in6, sin6_addr)},
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#endif
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{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
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offsetof(struct sockaddr_in, sin_addr)},
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{0, 0, 0, 0},
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};
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struct sockinet {
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u_char si_len;
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u_char si_family;
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u_short si_port;
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};
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2013-02-13 18:49:33 +01:00
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static int getnameinfo_inet(const struct sockaddr *, socklen_t, char *,
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socklen_t, char *, socklen_t, int);
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2009-03-04 04:28:35 +01:00
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#ifdef INET6
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2013-02-13 18:49:33 +01:00
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static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
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socklen_t, int);
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static int ip6_sa2str(const struct sockaddr_in6 *, char *, size_t, int);
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2012-06-12 00:01:10 +02:00
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#endif
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2013-02-13 18:49:33 +01:00
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static int getnameinfo_local(const struct sockaddr *, socklen_t, char *,
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socklen_t, char *, socklen_t, int);
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2012-02-28 00:58:54 +01:00
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2009-03-04 04:28:35 +01:00
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/*
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* Top-level getnameinfo() code. Look at the address family, and pick an
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* appropriate function to call.
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*/
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int getnameinfo(const struct sockaddr* sa, socklen_t salen, char* host, size_t hostlen, char* serv, size_t servlen, int flags)
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{
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switch (sa->sa_family) {
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case AF_INET:
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case AF_INET6:
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return getnameinfo_inet(sa, salen, host, hostlen,
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serv, servlen, flags);
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2013-02-13 18:49:33 +01:00
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case AF_LOCAL:
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return getnameinfo_local(sa, salen, host, hostlen,
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2009-03-04 04:28:35 +01:00
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serv, servlen, flags);
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default:
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return EAI_FAMILY;
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}
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}
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2013-02-13 18:49:33 +01:00
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/*
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* getnameinfo_local():
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* Format an local address into a printable format.
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*/
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/* ARGSUSED */
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static int
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getnameinfo_local(const struct sockaddr *sa, socklen_t salen,
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char *host, socklen_t hostlen, char *serv, socklen_t servlen,
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int flags __attribute__((unused)))
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{
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const struct sockaddr_un *sun =
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(const struct sockaddr_un *)(const void *)sa;
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if (salen < (socklen_t) offsetof(struct sockaddr_un, sun_path)) {
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return EAI_FAMILY;
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}
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if (serv != NULL && servlen > 0)
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serv[0] = '\0';
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if (host && hostlen > 0)
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strlcpy(host, sun->sun_path,
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MIN((socklen_t) sizeof(sun->sun_path) + 1, hostlen));
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return 0;
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}
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2011-02-15 08:45:26 +01:00
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#ifdef ANDROID_CHANGES
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/* On success length of the host name is returned. A return
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* value of 0 means there's no host name associated with
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* the address. On failure -1 is returned in which case
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* normal execution flow shall continue. */
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static int
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2012-02-28 00:58:54 +01:00
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android_gethostbyaddr_proxy(char* nameBuf, size_t nameBufLen, const void *addr, socklen_t addrLen, int addrFamily) {
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2011-02-15 08:45:26 +01:00
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int sock;
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const int one = 1;
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struct sockaddr_un proxy_addr;
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const char* cache_mode = getenv("ANDROID_DNS_MODE");
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FILE* proxy = NULL;
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int result = -1;
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if (cache_mode != NULL && strcmp(cache_mode, "local") == 0) {
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// Don't use the proxy in local mode. This is used by the
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// proxy itself.
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return -1;
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}
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2009-03-04 04:28:35 +01:00
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2011-02-15 08:45:26 +01:00
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// Temporary cautious hack to disable the DNS proxy for processes
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// requesting special treatment. Ideally the DNS proxy should
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// accomodate these apps, though.
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char propname[PROP_NAME_MAX];
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char propvalue[PROP_VALUE_MAX];
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snprintf(propname, sizeof(propname), "net.dns1.%d", getpid());
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if (__system_property_get(propname, propvalue) > 0) {
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return -1;
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}
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// create socket
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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return -1;
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}
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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memset(&proxy_addr, 0, sizeof(proxy_addr));
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proxy_addr.sun_family = AF_UNIX;
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strlcpy(proxy_addr.sun_path, "/dev/socket/dnsproxyd",
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sizeof(proxy_addr.sun_path));
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2011-04-27 20:55:43 +02:00
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if (TEMP_FAILURE_RETRY(connect(sock, (const struct sockaddr*) (void*) &proxy_addr,
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2011-02-15 08:45:26 +01:00
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sizeof(proxy_addr))) != 0) {
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close(sock);
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return -1;
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}
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// send request to DnsProxyListener
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proxy = fdopen(sock,"r+");
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if (proxy == NULL) {
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goto exit;
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}
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2011-04-27 20:55:43 +02:00
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char buf[INET6_ADDRSTRLEN]; // big enough for IPv4 and IPv6
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2012-02-28 00:58:54 +01:00
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const char* addrStr = inet_ntop(addrFamily, addr, buf, sizeof(buf));
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2011-04-27 20:55:43 +02:00
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if (addrStr == NULL) {
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goto exit;
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}
|
2012-02-24 20:04:42 +01:00
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if (fprintf(proxy, "gethostbyaddr %s %d %d", addrStr, addrLen, addrFamily) < 0) {
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2011-02-15 08:45:26 +01:00
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goto exit;
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}
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// literal NULL byte at end, required by FrameworkListener
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if (fputc(0, proxy) == EOF || fflush(proxy) != 0) {
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goto exit;
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}
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result = 0;
|
2012-03-09 20:34:27 +01:00
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char msg_buf[4];
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2012-02-28 00:58:54 +01:00
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// read result code for gethostbyaddr
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if (fread(msg_buf, 1, sizeof(msg_buf), proxy) != sizeof(msg_buf)) {
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goto exit;
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}
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int result_code = (int)strtol(msg_buf, NULL, 10);
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// verify the code itself
|
2013-02-13 18:49:33 +01:00
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// This should be synchronized to ResponseCode.h
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static const int DnsProxyQueryResult = 222;
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2012-02-28 00:58:54 +01:00
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if (result_code != DnsProxyQueryResult) {
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goto exit;
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}
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|
2011-02-15 08:45:26 +01:00
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uint32_t name_len;
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|
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if (fread(&name_len, sizeof(name_len), 1, proxy) != 1) {
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goto exit;
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}
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name_len = ntohl(name_len);
|
2012-02-28 00:58:54 +01:00
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if (name_len <= 0 || name_len >= nameBufLen) {
|
2011-02-15 08:45:26 +01:00
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goto exit;
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}
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2012-02-28 00:58:54 +01:00
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if (fread(nameBuf, name_len, 1, proxy) != 1) {
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2011-02-15 08:45:26 +01:00
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goto exit;
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}
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result = name_len;
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exit:
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|
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if (proxy != NULL) {
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fclose(proxy);
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}
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return result;
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}
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#endif
|
2013-02-13 18:49:33 +01:00
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|
2009-03-04 04:28:35 +01:00
|
|
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/*
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|
|
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* getnameinfo_inet():
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|
|
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* Format an IPv4 or IPv6 sockaddr into a printable string.
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*/
|
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|
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static int
|
2013-02-13 18:49:33 +01:00
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getnameinfo_inet(const struct sockaddr* sa, socklen_t salen,
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|
|
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char *host, socklen_t hostlen,
|
|
|
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char *serv, socklen_t servlen,
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|
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int flags)
|
2009-03-04 04:28:35 +01:00
|
|
|
{
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|
|
|
const struct afd *afd;
|
|
|
|
struct servent *sp;
|
|
|
|
struct hostent *hp;
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|
|
u_short port;
|
|
|
|
int family, i;
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|
|
|
const char *addr;
|
2013-02-13 18:49:33 +01:00
|
|
|
uint32_t v4a;
|
2009-03-04 04:28:35 +01:00
|
|
|
char numserv[512];
|
|
|
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char numaddr[512];
|
|
|
|
|
|
|
|
/* sa is checked below */
|
|
|
|
/* host may be NULL */
|
|
|
|
/* serv may be NULL */
|
|
|
|
|
|
|
|
if (sa == NULL)
|
|
|
|
return EAI_FAIL;
|
|
|
|
|
|
|
|
family = sa->sa_family;
|
|
|
|
for (i = 0; afdl[i].a_af; i++)
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|
|
|
if (afdl[i].a_af == family) {
|
|
|
|
afd = &afdl[i];
|
|
|
|
goto found;
|
|
|
|
}
|
|
|
|
return EAI_FAMILY;
|
|
|
|
|
|
|
|
found:
|
2013-02-13 18:49:33 +01:00
|
|
|
// http://b/1889275: callers should be allowed to provide too much
|
|
|
|
// space, but not too little.
|
|
|
|
if (salen < afd->a_socklen) {
|
|
|
|
return EAI_FAMILY;
|
|
|
|
}
|
2009-03-04 04:28:35 +01:00
|
|
|
|
|
|
|
/* network byte order */
|
|
|
|
port = ((const struct sockinet *)(const void *)sa)->si_port;
|
|
|
|
addr = (const char *)(const void *)sa + afd->a_off;
|
|
|
|
|
|
|
|
if (serv == NULL || servlen == 0) {
|
|
|
|
/*
|
|
|
|
* do nothing in this case.
|
|
|
|
* in case you are wondering if "&&" is more correct than
|
|
|
|
* "||" here: rfc2553bis-03 says that serv == NULL OR
|
|
|
|
* servlen == 0 means that the caller does not want the result.
|
|
|
|
*/
|
|
|
|
} else {
|
|
|
|
if (flags & NI_NUMERICSERV)
|
|
|
|
sp = NULL;
|
|
|
|
else {
|
|
|
|
sp = getservbyport(port,
|
|
|
|
(flags & NI_DGRAM) ? "udp" : "tcp");
|
|
|
|
}
|
|
|
|
if (sp) {
|
|
|
|
if (strlen(sp->s_name) + 1 > (size_t)servlen)
|
|
|
|
return EAI_MEMORY;
|
|
|
|
strlcpy(serv, sp->s_name, servlen);
|
|
|
|
} else {
|
|
|
|
snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
|
|
|
|
if (strlen(numserv) + 1 > (size_t)servlen)
|
|
|
|
return EAI_MEMORY;
|
|
|
|
strlcpy(serv, numserv, servlen);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (sa->sa_family) {
|
|
|
|
case AF_INET:
|
2013-02-13 18:49:33 +01:00
|
|
|
v4a = (uint32_t)
|
2009-03-04 04:28:35 +01:00
|
|
|
ntohl(((const struct sockaddr_in *)
|
|
|
|
(const void *)sa)->sin_addr.s_addr);
|
|
|
|
if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
|
|
|
|
flags |= NI_NUMERICHOST;
|
|
|
|
v4a >>= IN_CLASSA_NSHIFT;
|
|
|
|
if (v4a == 0)
|
|
|
|
flags |= NI_NUMERICHOST;
|
|
|
|
break;
|
|
|
|
#ifdef INET6
|
|
|
|
case AF_INET6:
|
|
|
|
{
|
|
|
|
const struct sockaddr_in6 *sin6;
|
|
|
|
sin6 = (const struct sockaddr_in6 *)(const void *)sa;
|
|
|
|
switch (sin6->sin6_addr.s6_addr[0]) {
|
|
|
|
case 0x00:
|
|
|
|
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
|
|
|
|
;
|
|
|
|
else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
|
|
|
|
;
|
|
|
|
else
|
|
|
|
flags |= NI_NUMERICHOST;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
|
|
|
|
flags |= NI_NUMERICHOST;
|
|
|
|
}
|
|
|
|
else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
|
|
|
|
flags |= NI_NUMERICHOST;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
if (host == NULL || hostlen == 0) {
|
|
|
|
/*
|
|
|
|
* do nothing in this case.
|
|
|
|
* in case you are wondering if "&&" is more correct than
|
|
|
|
* "||" here: rfc2553bis-03 says that host == NULL or
|
|
|
|
* hostlen == 0 means that the caller does not want the result.
|
|
|
|
*/
|
|
|
|
} else if (flags & NI_NUMERICHOST) {
|
|
|
|
size_t numaddrlen;
|
|
|
|
|
|
|
|
/* NUMERICHOST and NAMEREQD conflicts with each other */
|
|
|
|
if (flags & NI_NAMEREQD)
|
|
|
|
return EAI_NONAME;
|
|
|
|
|
|
|
|
switch(afd->a_af) {
|
|
|
|
#ifdef INET6
|
|
|
|
case AF_INET6:
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
if ((error = ip6_parsenumeric(sa, addr, host,
|
|
|
|
hostlen, flags)) != 0)
|
|
|
|
return(error);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
|
|
|
|
== NULL)
|
|
|
|
return EAI_SYSTEM;
|
|
|
|
numaddrlen = strlen(numaddr);
|
|
|
|
if (numaddrlen + 1 > (size_t)hostlen) /* don't forget terminator */
|
|
|
|
return EAI_MEMORY;
|
|
|
|
strlcpy(host, numaddr, hostlen);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
2011-02-15 08:45:26 +01:00
|
|
|
#ifdef ANDROID_CHANGES
|
|
|
|
struct hostent android_proxy_hostent;
|
|
|
|
char android_proxy_buf[MAXDNAME];
|
|
|
|
|
2012-02-28 00:58:54 +01:00
|
|
|
int hostnamelen = android_gethostbyaddr_proxy(android_proxy_buf,
|
|
|
|
MAXDNAME, addr, afd->a_addrlen, afd->a_af);
|
|
|
|
if (hostnamelen > 0) {
|
|
|
|
hp = &android_proxy_hostent;
|
|
|
|
hp->h_name = android_proxy_buf;
|
|
|
|
} else if (!hostnamelen) {
|
|
|
|
hp = NULL;
|
2011-02-15 08:45:26 +01:00
|
|
|
} else {
|
|
|
|
hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
|
|
|
|
}
|
|
|
|
#else
|
2009-03-04 04:28:35 +01:00
|
|
|
hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
|
2011-02-15 08:45:26 +01:00
|
|
|
#endif
|
2009-03-04 04:28:35 +01:00
|
|
|
|
|
|
|
if (hp) {
|
2013-02-13 18:49:33 +01:00
|
|
|
#if 0
|
2009-03-04 04:28:35 +01:00
|
|
|
/*
|
|
|
|
* commented out, since "for local host" is not
|
|
|
|
* implemented here - see RFC2553 p30
|
|
|
|
*/
|
|
|
|
if (flags & NI_NOFQDN) {
|
|
|
|
char *p;
|
|
|
|
p = strchr(hp->h_name, '.');
|
|
|
|
if (p)
|
|
|
|
*p = '\0';
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (strlen(hp->h_name) + 1 > (size_t)hostlen) {
|
|
|
|
return EAI_MEMORY;
|
|
|
|
}
|
|
|
|
strlcpy(host, hp->h_name, hostlen);
|
|
|
|
} else {
|
|
|
|
if (flags & NI_NAMEREQD)
|
|
|
|
return EAI_NONAME;
|
|
|
|
switch(afd->a_af) {
|
|
|
|
#ifdef INET6
|
|
|
|
case AF_INET6:
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
if ((error = ip6_parsenumeric(sa, addr, host,
|
|
|
|
hostlen,
|
|
|
|
flags)) != 0)
|
|
|
|
return(error);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
if (inet_ntop(afd->a_af, addr, host,
|
|
|
|
hostlen) == NULL)
|
|
|
|
return EAI_SYSTEM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef INET6
|
|
|
|
static int
|
2013-02-13 18:49:33 +01:00
|
|
|
ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host,
|
|
|
|
socklen_t hostlen, int flags)
|
2009-03-04 04:28:35 +01:00
|
|
|
{
|
|
|
|
size_t numaddrlen;
|
|
|
|
char numaddr[512];
|
|
|
|
|
|
|
|
assert(sa != NULL);
|
|
|
|
assert(addr != NULL);
|
|
|
|
assert(host != NULL);
|
|
|
|
|
|
|
|
if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
|
|
|
|
return EAI_SYSTEM;
|
|
|
|
|
|
|
|
numaddrlen = strlen(numaddr);
|
2010-06-17 01:36:41 +02:00
|
|
|
if (numaddrlen + 1 > (size_t)hostlen) /* don't forget terminator */
|
2009-03-04 04:28:35 +01:00
|
|
|
return EAI_OVERFLOW;
|
|
|
|
strlcpy(host, numaddr, hostlen);
|
|
|
|
|
|
|
|
if (((const struct sockaddr_in6 *)(const void *)sa)->sin6_scope_id) {
|
|
|
|
char zonebuf[MAXHOSTNAMELEN];
|
|
|
|
int zonelen;
|
|
|
|
|
|
|
|
zonelen = ip6_sa2str(
|
|
|
|
(const struct sockaddr_in6 *)(const void *)sa,
|
|
|
|
zonebuf, sizeof(zonebuf), flags);
|
|
|
|
if (zonelen < 0)
|
|
|
|
return EAI_OVERFLOW;
|
2010-06-17 01:36:41 +02:00
|
|
|
if ((size_t) zonelen + 1 + numaddrlen + 1 > (size_t)hostlen)
|
2009-03-04 04:28:35 +01:00
|
|
|
return EAI_OVERFLOW;
|
|
|
|
/* construct <numeric-addr><delim><zoneid> */
|
|
|
|
memcpy(host + numaddrlen + 1, zonebuf,
|
|
|
|
(size_t)zonelen);
|
|
|
|
host[numaddrlen] = SCOPE_DELIMITER;
|
|
|
|
host[numaddrlen + 1 + zonelen] = '\0';
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
static int
|
2013-02-13 18:49:33 +01:00
|
|
|
ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf, size_t bufsiz, int flags)
|
2009-03-04 04:28:35 +01:00
|
|
|
{
|
|
|
|
unsigned int ifindex;
|
|
|
|
const struct in6_addr *a6;
|
|
|
|
int n;
|
|
|
|
|
|
|
|
assert(sa6 != NULL);
|
|
|
|
assert(buf != NULL);
|
|
|
|
|
|
|
|
ifindex = (unsigned int)sa6->sin6_scope_id;
|
|
|
|
a6 = &sa6->sin6_addr;
|
|
|
|
|
|
|
|
#ifdef NI_NUMERICSCOPE
|
|
|
|
if ((flags & NI_NUMERICSCOPE) != 0) {
|
|
|
|
n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
|
|
|
|
if (n < 0 || n >= bufsiz)
|
|
|
|
return -1;
|
|
|
|
else
|
|
|
|
return n;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* if_indextoname() does not take buffer size. not a good api... */
|
|
|
|
if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) &&
|
|
|
|
bufsiz >= IF_NAMESIZE) {
|
|
|
|
char *p = if_indextoname(ifindex, buf);
|
|
|
|
if (p) {
|
|
|
|
return(strlen(p));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* last resort */
|
|
|
|
n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
|
|
|
|
if (n < 0 || (size_t) n >= bufsiz)
|
|
|
|
return -1;
|
|
|
|
else
|
|
|
|
return n;
|
|
|
|
}
|
|
|
|
#endif /* INET6 */
|