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446 lines
12 KiB
446 lines
12 KiB
/* $NetBSD: getnameinfo.c,v 1.53 2012/09/26 23:13:00 christos Exp $ */
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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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__RCSID("$NetBSD: getnameinfo.c,v 1.53 2012/09/26 23:13:00 christos Exp $");
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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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#include <sys/un.h>
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#include <net/if.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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#include <arpa/nameser.h>
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#include "resolv_netid.h"
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#include "resolv_private.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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#include <stddef.h>
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#include <string.h>
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#include "private/bionic_defs.h"
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/* This macro is modelled after the ones in <netinet/in6.h>. */
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/* RFC 6052, section 2.1 */
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#define IN6_IS_ADDR_WKP(a) \
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((((a)->s6_addr32[0]) == ntohl(0x0064ff9b)) && \
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(((a)->s6_addr32[1]) == 0) && \
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(((a)->s6_addr32[2]) == 0))
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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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static int getnameinfo_inet(const struct sockaddr *, socklen_t, char *,
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socklen_t, char *, socklen_t, int, unsigned, unsigned);
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#ifdef INET6
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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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#endif
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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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/*
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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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__BIONIC_WEAK_FOR_NATIVE_BRIDGE
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int getnameinfo(const struct sockaddr* sa, socklen_t salen, char* host, size_t hostlen,
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char* serv, size_t servlen, int flags)
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{
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return android_getnameinfofornet(sa, salen, host, hostlen, serv, servlen, flags,
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NETID_UNSET, MARK_UNSET);
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}
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int android_getnameinfofornet(const struct sockaddr* sa, socklen_t salen, char* host,
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size_t hostlen, char* serv, size_t servlen, int flags, unsigned netid,
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unsigned mark)
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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, netid, mark);
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case AF_LOCAL:
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return getnameinfo_local(sa, salen, host, hostlen,
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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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/*
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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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/*
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* getnameinfo_inet():
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* Format an IPv4 or IPv6 sockaddr into a printable string.
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*/
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static int
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getnameinfo_inet(const struct sockaddr* sa, socklen_t salen,
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char *host, socklen_t hostlen,
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char *serv, socklen_t servlen,
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int flags, unsigned netid, unsigned mark)
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{
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const struct afd *afd;
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struct servent *sp;
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struct hostent *hp;
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u_short port;
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int family, i;
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const char *addr;
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uint32_t v4a;
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char numserv[512];
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char numaddr[512];
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/* sa is checked below */
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/* host may be NULL */
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/* serv may be NULL */
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if (sa == NULL)
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return EAI_FAIL;
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family = sa->sa_family;
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for (i = 0; afdl[i].a_af; i++)
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if (afdl[i].a_af == family) {
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afd = &afdl[i];
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goto found;
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}
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return EAI_FAMILY;
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found:
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// http://b/1889275: callers should be allowed to provide too much
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// space, but not too little.
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if (salen < afd->a_socklen) {
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return EAI_FAMILY;
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}
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/* network byte order */
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port = ((const struct sockinet *)(const void *)sa)->si_port;
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addr = (const char *)(const void *)sa + afd->a_off;
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if (serv == NULL || servlen == 0) {
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/*
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* do nothing in this case.
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* in case you are wondering if "&&" is more correct than
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* "||" here: rfc2553bis-03 says that serv == NULL OR
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* servlen == 0 means that the caller does not want the result.
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*/
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} else {
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if (flags & NI_NUMERICSERV)
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sp = NULL;
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else {
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sp = getservbyport(port,
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(flags & NI_DGRAM) ? "udp" : "tcp");
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}
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if (sp) {
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if (strlen(sp->s_name) + 1 > (size_t)servlen)
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return EAI_MEMORY;
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strlcpy(serv, sp->s_name, servlen);
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} else {
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snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
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if (strlen(numserv) + 1 > (size_t)servlen)
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return EAI_MEMORY;
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strlcpy(serv, numserv, servlen);
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}
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}
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switch (sa->sa_family) {
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case AF_INET:
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v4a = (uint32_t)
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ntohl(((const struct sockaddr_in *)
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(const void *)sa)->sin_addr.s_addr);
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if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
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flags |= NI_NUMERICHOST;
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v4a >>= IN_CLASSA_NSHIFT;
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if (v4a == 0)
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flags |= NI_NUMERICHOST;
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break;
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#ifdef INET6
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case AF_INET6:
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{
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const struct sockaddr_in6 *sin6;
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sin6 = (const struct sockaddr_in6 *)(const void *)sa;
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switch (sin6->sin6_addr.s6_addr[0]) {
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case 0x00:
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if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
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;
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else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
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;
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else if (IN6_IS_ADDR_WKP(&sin6->sin6_addr))
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;
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else
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flags |= NI_NUMERICHOST;
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break;
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default:
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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
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flags |= NI_NUMERICHOST;
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}
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else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
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flags |= NI_NUMERICHOST;
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break;
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}
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}
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break;
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#endif
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}
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if (host == NULL || hostlen == 0) {
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/*
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* do nothing in this case.
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* in case you are wondering if "&&" is more correct than
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* "||" here: rfc2553bis-03 says that host == NULL or
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* hostlen == 0 means that the caller does not want the result.
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*/
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} else if (flags & NI_NUMERICHOST) {
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size_t numaddrlen;
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/* NUMERICHOST and NAMEREQD conflicts with each other */
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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switch(afd->a_af) {
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#ifdef INET6
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case AF_INET6:
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{
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int error;
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if ((error = ip6_parsenumeric(sa, addr, host,
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hostlen, flags)) != 0)
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return(error);
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break;
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}
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#endif
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default:
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if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
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== NULL)
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return EAI_SYSTEM;
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numaddrlen = strlen(numaddr);
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if (numaddrlen + 1 > (size_t)hostlen) /* don't forget terminator */
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return EAI_MEMORY;
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strlcpy(host, numaddr, hostlen);
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break;
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}
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} else {
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// This code should only run in the app context, not inside netd, so netid is
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// the app's netid. netd doesn't use getnameinfo for network requests.
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const struct android_net_context netcontext = { .app_netid = netid, .app_mark = mark };
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hp = android_gethostbyaddrfornetcontext_proxy(addr, afd->a_addrlen, afd->a_af, &netcontext);
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if (hp) {
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#if 0
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/*
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* commented out, since "for local host" is not
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* implemented here - see RFC2553 p30
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*/
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if (flags & NI_NOFQDN) {
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char *p;
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p = strchr(hp->h_name, '.');
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if (p)
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TODO: Before uncommenting rewrite to avoid modifying hp.
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*p = '\0';
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}
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#endif
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if (strlen(hp->h_name) + 1 > (size_t)hostlen) {
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return EAI_MEMORY;
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}
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strlcpy(host, hp->h_name, hostlen);
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} else {
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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switch(afd->a_af) {
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#ifdef INET6
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case AF_INET6:
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{
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int error;
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if ((error = ip6_parsenumeric(sa, addr, host,
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hostlen,
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flags)) != 0)
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return(error);
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break;
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}
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#endif
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default:
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if (inet_ntop(afd->a_af, addr, host,
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hostlen) == NULL)
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return EAI_SYSTEM;
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break;
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}
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}
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}
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return(0);
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}
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#ifdef INET6
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static int
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ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host,
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socklen_t hostlen, int flags)
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{
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size_t numaddrlen;
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char numaddr[512];
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assert(sa != NULL);
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assert(addr != NULL);
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assert(host != NULL);
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if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
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return EAI_SYSTEM;
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numaddrlen = strlen(numaddr);
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if (numaddrlen + 1 > (size_t)hostlen) /* don't forget terminator */
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return EAI_OVERFLOW;
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strlcpy(host, numaddr, hostlen);
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if (((const struct sockaddr_in6 *)(const void *)sa)->sin6_scope_id) {
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char zonebuf[MAXHOSTNAMELEN];
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int zonelen;
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zonelen = ip6_sa2str(
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(const struct sockaddr_in6 *)(const void *)sa,
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zonebuf, sizeof(zonebuf), flags);
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if (zonelen < 0)
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return EAI_OVERFLOW;
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if ((size_t) zonelen + 1 + numaddrlen + 1 > (size_t)hostlen)
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return EAI_OVERFLOW;
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/* construct <numeric-addr><delim><zoneid> */
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memcpy(host + numaddrlen + 1, zonebuf,
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(size_t)zonelen);
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host[numaddrlen] = SCOPE_DELIMITER;
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host[numaddrlen + 1 + zonelen] = '\0';
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}
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return 0;
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}
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/* ARGSUSED */
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static int
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ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf, size_t bufsiz, int flags)
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{
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unsigned int ifindex;
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const struct in6_addr *a6;
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int n;
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assert(sa6 != NULL);
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assert(buf != NULL);
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ifindex = (unsigned int)sa6->sin6_scope_id;
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a6 = &sa6->sin6_addr;
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#ifdef NI_NUMERICSCOPE
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if ((flags & NI_NUMERICSCOPE) != 0) {
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n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
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if (n < 0 || n >= bufsiz)
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return -1;
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else
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return n;
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}
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#endif
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/* if_indextoname() does not take buffer size. not a good api... */
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if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) &&
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bufsiz >= IF_NAMESIZE) {
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char *p = if_indextoname(ifindex, buf);
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if (p) {
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return(strlen(p));
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}
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}
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/* last resort */
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n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
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if (n < 0 || (size_t) n >= bufsiz)
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return -1;
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else
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return n;
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}
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#endif /* INET6 */
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