6617cf5778
Reviewed by: Kame Project (including Itojun-san, Jinmei-san and Suzuki-san) Approved by: Robert Watson (robert at freebsd dot org) Obtained from: Kame Project and OpenBSD Replace manual pages that may have violated the IETF's Copyright. All come from the Kame tree. Several were from OpenBSD except for ip6.4, and the inet6* pages which were rewritten by me. All of the text is new and drawn from reading the code and documentation.
272 lines
6.9 KiB
Groff
272 lines
6.9 KiB
Groff
.\" $KAME: getnameinfo.3,v 1.37 2005/01/05 03:23:05 itojun Exp $
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.\" $OpenBSD: getnameinfo.3,v 1.36 2004/12/21 09:48:20 jmc Exp $
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.\" $FreeBSD$
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.\"
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.\" Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
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.\" Copyright (C) 2000, 2001 Internet Software Consortium.
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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.\" PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd December 20, 2004
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.Dt GETNAMEINFO 3
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.Os
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.Sh NAME
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.Nm getnameinfo
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.Nd socket address structure to hostname and service name
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <sys/socket.h>
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.Fd #include <netdb.h>
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.Ft int
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.Fn getnameinfo "const struct sockaddr *sa" "socklen_t salen" "char *host" \
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"size_t hostlen" "char *serv" "size_t servlen" "int flags"
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.Sh DESCRIPTION
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The
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.Fn getnameinfo
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function is used to convert a
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.Li sockaddr
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structure to a pair of host name and service strings.
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It is a replacement for and provides more flexibility than the
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.Xr gethostbyaddr 3
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and
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.Xr getservbyport 3
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functions and is the converse of the
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.Xr getaddrinfo 3
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function.
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.Pp
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The
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.Li sockaddr
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structure
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.Fa sa
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should point to either a
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.Li sockaddr_in
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or
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.Li sockaddr_in6
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structure (for IPv4 or IPv6 respectively) that is
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.Fa salen
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bytes long.
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.Pp
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The host and service names associated with
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.Fa sa
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are stored in
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.Fa host
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and
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.Fa serv
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which have length parameters
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.Fa hostlen
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and
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.Fa servlen .
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The maximum value for
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.Fa hostlen
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is
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.Dv NI_MAXHOST
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and
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the maximum value for
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.Fa servlen
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is
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.Dv NI_MAXSERV ,
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as defined by
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.Aq Pa netdb.h .
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If a length parameter is zero, no string will be stored.
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Otherwise, enough space must be provided to store the
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host name or service string plus a byte for the NUL terminator.
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.Pp
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The
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.Fa flags
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argument is formed by
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.Tn OR Ns 'ing
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the following values:
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.Bl -tag -width "NI_NUMERICHOSTXX"
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.It Dv NI_NOFQDN
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A fully qualified domain name is not required for local hosts.
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The local part of the fully qualified domain name is returned instead.
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.It Dv NI_NUMERICHOST
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Return the address in numeric form, as if calling
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.Xr inet_ntop 3 ,
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instead of a host name.
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.It Dv NI_NAMEREQD
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A name is required.
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If the host name cannot be found in DNS and this flag is set,
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a non-zero error code is returned.
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If the host name is not found and the flag is not set, the
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address is returned in numeric form.
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.It NI_NUMERICSERV
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The service name is returned as a digit string representing the port number.
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.It NI_DGRAM
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Specifies that the service being looked up is a datagram
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service, and causes
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.Xr getservbyport 3
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to be called with a second argument of
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.Dq udp
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instead of its default of
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.Dq tcp .
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This is required for the few ports (512\-514) that have different services
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for
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.Tn UDP
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and
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.Tn TCP .
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.El
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.Pp
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This implementation allows numeric IPv6 address notation with scope identifier,
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as documented in chapter 11 of draft-ietf-ipv6-scoping-arch-02.txt.
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IPv6 link-local address will appear as a string like
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.Dq Li fe80::1%ne0 .
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Refer to
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.Xr getaddrinfo 3
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for more information.
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.Sh RETURN VALUES
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.Fn getnameinfo
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returns zero on success or one of the error codes listed in
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.Xr gai_strerror 3
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if an error occurs.
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.Sh EXAMPLES
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The following code tries to get a numeric host name, and service name,
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for a given socket address.
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Observe that there is no hardcoded reference to a particular address family.
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.Bd -literal -offset indent
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struct sockaddr *sa; /* input */
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), sbuf,
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sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV)) {
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errx(1, "could not get numeric hostname");
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/*NOTREACHED*/
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}
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printf("host=%s, serv=%s\en", hbuf, sbuf);
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.Ed
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.Pp
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The following version checks if the socket address has a reverse address mapping:
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.Bd -literal -offset indent
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struct sockaddr *sa; /* input */
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char hbuf[NI_MAXHOST];
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if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0,
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NI_NAMEREQD)) {
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errx(1, "could not resolve hostname");
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/*NOTREACHED*/
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}
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printf("host=%s\en", hbuf);
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.Ed
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.Sh SEE ALSO
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.Xr gai_strerror 3 ,
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.Xr getaddrinfo 3 ,
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.Xr gethostbyaddr 3 ,
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.Xr getservbyport 3 ,
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.Xr inet_ntop 3 ,
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.Xr resolver 3 ,
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.Xr hosts 5 ,
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.Xr resolv.conf 5 ,
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.Xr services 5 ,
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.Xr hostname 7 ,
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.Xr named 8
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.Rs
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.%A R. Gilligan
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.%A S. Thomson
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.%A J. Bound
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.%A W. Stevens
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.%T Basic Socket Interface Extensions for IPv6
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.%R RFC 2553
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.%D March 1999
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.Re
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.Rs
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.%A S. Deering
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.%A B. Haberman
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.%A T. Jinmei
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.%A E. Nordmark
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.%A B. Zill
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.%T "IPv6 Scoped Address Architecture"
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.%R internet draft
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.%N draft-ietf-ipv6-scoping-arch-02.txt
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.%O work in progress material
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.Re
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.Rs
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.%A Craig Metz
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.%T Protocol Independence Using the Sockets API
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.%B "Proceedings of the freenix track: 2000 USENIX annual technical conference"
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.%D June 2000
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.Re
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.Sh STANDARDS
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The
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.Fn getnameinfo
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function is defined by the
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.St -p1003.1g-2000
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draft specification and documented in
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.Tn "RFC 2553" ,
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.Dq Basic Socket Interface Extensions for IPv6 .
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.Sh CAVEATS
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.Fn getnameinfo
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can return both numeric and FQDN forms of the address specified in
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.Fa sa .
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There is no return value that indicates whether the string returned in
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.Fa host
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is a result of binary to numeric-text translation (like
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.Xr inet_ntop 3 ) ,
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or is the result of a DNS reverse lookup.
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Because of this, malicious parties could set up a PTR record as follows:
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.Bd -literal -offset indent
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1.0.0.127.in-addr.arpa. IN PTR 10.1.1.1
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.Ed
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.Pp
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and trick the caller of
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.Fn getnameinfo
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into believing that
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.Fa sa
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is
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.Li 10.1.1.1
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when it is actually
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.Li 127.0.0.1 .
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.Pp
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To prevent such attacks, the use of
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.Dv NI_NAMEREQD
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is recommended when the result of
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.Fn getnameinfo
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is used
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for access control purposes:
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.Bd -literal -offset indent
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struct sockaddr *sa;
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socklen_t salen;
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char addr[NI_MAXHOST];
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struct addrinfo hints, *res;
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int error;
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error = getnameinfo(sa, salen, addr, sizeof(addr),
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NULL, 0, NI_NAMEREQD);
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if (error == 0) {
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_DGRAM; /*dummy*/
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hints.ai_flags = AI_NUMERICHOST;
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if (getaddrinfo(addr, "0", &hints, &res) == 0) {
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/* malicious PTR record */
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freeaddrinfo(res);
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printf("bogus PTR record\en");
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return -1;
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}
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/* addr is FQDN as a result of PTR lookup */
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} else {
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/* addr is numeric string */
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error = getnameinfo(sa, salen, addr, sizeof(addr),
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NULL, 0, NI_NUMERICHOST);
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}
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.Ed
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.Sh BUGS
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The implementation of
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.Fn getnameinfo
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is not thread-safe.
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.\".Pp
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.\".Ox
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.\"intentionally uses a different
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.\".Dv NI_MAXHOST
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.\"value from what
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.\".Tn "RFC 2553"
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.\"suggests, to avoid buffer length handling mistakes.
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