b4a395a41b
POSIX also declares NI_NUMERICSCOPE, which makes getnameinfo() return a numerical scope identifier. The interesting thing is that support for this is already present in code, but #ifdef disabled. Expose this functionality by placing a definition for it in <netdb.h>. While there, remove references to NI_WITHSCOPEID, as that got removed 11 years ago.
530 lines
14 KiB
C
530 lines
14 KiB
C
/* $KAME: getnameinfo.c,v 1.61 2002/06/27 09:25:47 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* Copyright (c) 2000 Ben Harris.
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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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__FBSDID("$FreeBSD$");
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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 <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/firewire.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <string.h>
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#include <stddef.h>
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#include <errno.h>
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static const struct afd *find_afd(int);
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static int getnameinfo_inet(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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#ifdef INET6
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static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
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size_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_link(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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static int hexname(const u_int8_t *, size_t, char *, size_t);
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static int getnameinfo_un(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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static const struct afd {
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int a_af;
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size_t a_addrlen;
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socklen_t a_socklen;
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int a_off;
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int (*a_func)(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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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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getnameinfo_inet},
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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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getnameinfo_inet},
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#define sizeofmember(type, member) (sizeof(((type *)0)->member))
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{PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
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sizeof(struct sockaddr_un),
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offsetof(struct sockaddr_un, sun_path),
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getnameinfo_un},
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{PF_LINK, sizeofmember(struct sockaddr_dl, sdl_data),
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sizeof(struct sockaddr_dl),
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offsetof(struct sockaddr_dl, sdl_data),
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getnameinfo_link},
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{0, 0, 0},
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};
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int
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getnameinfo(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen, char *serv, size_t servlen,
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int flags)
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{
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const struct afd *afd;
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if (sa == NULL)
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return (EAI_FAIL);
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afd = find_afd(sa->sa_family);
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if (afd == NULL)
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return (EAI_FAMILY);
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switch (sa->sa_family) {
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case PF_LOCAL:
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/*
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* PF_LOCAL uses variable sa->sa_len depending on the
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* content length of sun_path. Require 1 byte in
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* sun_path at least.
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*/
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if (salen > afd->a_socklen ||
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salen <= afd->a_socklen -
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sizeofmember(struct sockaddr_un, sun_path))
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return (EAI_FAIL);
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break;
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case PF_LINK:
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if (salen <= afd->a_socklen -
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sizeofmember(struct sockaddr_dl, sdl_data))
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return (EAI_FAIL);
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break;
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default:
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if (salen != afd->a_socklen)
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return (EAI_FAIL);
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break;
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}
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return ((*afd->a_func)(afd, sa, salen, host, hostlen,
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serv, servlen, flags));
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}
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static const struct afd *
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find_afd(int af)
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{
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const struct afd *afd;
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if (af == PF_UNSPEC)
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return (NULL);
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for (afd = &afdl[0]; afd->a_af > 0; afd++) {
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if (afd->a_af == af)
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return (afd);
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}
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return (NULL);
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}
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static int
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getnameinfo_inet(const struct afd *afd,
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const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen, char *serv, size_t servlen,
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int flags)
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{
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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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const char *addr;
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u_int32_t v4a;
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int h_error;
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char numserv[512];
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char numaddr[512];
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/* network byte order */
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port = ((const struct sockaddr_in *)sa)->sin_port;
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addr = (const char *)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 > 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 > 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 = (u_int32_t)
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ntohl(((const struct sockaddr_in *)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 *)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
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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 > 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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hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
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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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*p = '\0';
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}
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#endif
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if (strlen(hp->h_name) + 1 > hostlen) {
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freehostent(hp);
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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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freehostent(hp);
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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,
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char *host, size_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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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 > 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 *)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 (zonelen + 1 + numaddrlen + 1 > 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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ifindex = (unsigned int)sa6->sin6_scope_id;
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a6 = &sa6->sin6_addr;
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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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/* 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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IN6_IS_ADDR_MC_NODELOCAL(a6)) && 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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/*
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* getnameinfo_link():
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* Format a link-layer address into a printable format, paying attention to
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* the interface type.
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*/
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/* ARGSUSED */
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static int
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getnameinfo_link(const struct afd *afd,
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const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen, char *serv, size_t servlen, int flags)
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{
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const struct sockaddr_dl *sdl =
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(const struct sockaddr_dl *)(const void *)sa;
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const struct fw_hwaddr *iha;
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int n;
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if (serv != NULL && servlen > 0)
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*serv = '\0';
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if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 && sdl->sdl_slen == 0) {
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n = snprintf(host, hostlen, "link#%d", sdl->sdl_index);
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if (n >= hostlen) {
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*host = '\0';
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return (EAI_MEMORY);
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}
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return (0);
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}
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if (sdl->sdl_nlen > 0 && sdl->sdl_alen == 0) {
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n = sdl->sdl_nlen;
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if (n >= hostlen) {
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*host = '\0';
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return (EAI_MEMORY);
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}
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memcpy(host, sdl->sdl_data, sdl->sdl_nlen);
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host[n] = '\0';
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return (0);
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}
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switch (sdl->sdl_type) {
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case IFT_IEEE1394:
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if (sdl->sdl_alen < sizeof(iha->sender_unique_ID_hi) +
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sizeof(iha->sender_unique_ID_lo))
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return EAI_FAMILY;
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iha = (const struct fw_hwaddr *)(const void *)LLADDR(sdl);
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return hexname((const u_int8_t *)&iha->sender_unique_ID_hi,
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sizeof(iha->sender_unique_ID_hi) +
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sizeof(iha->sender_unique_ID_lo),
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host, hostlen);
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/*
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* The following have zero-length addresses.
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* IFT_ATM (net/if_atmsubr.c)
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* IFT_GIF (net/if_gif.c)
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* IFT_LOOP (net/if_loop.c)
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* IFT_PPP (net/if_ppp.c, net/if_spppsubr.c)
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* IFT_SLIP (net/if_sl.c, net/if_strip.c)
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* IFT_STF (net/if_stf.c)
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* IFT_L2VLAN (net/if_vlan.c)
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* IFT_BRIDGE (net/if_bridge.h>
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*/
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/*
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* The following use IPv4 addresses as link-layer addresses:
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* IFT_OTHER (net/if_gre.c)
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* IFT_OTHER (netinet/ip_ipip.c)
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*/
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/* default below is believed correct for all these. */
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case IFT_ARCNET:
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case IFT_ETHER:
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case IFT_FDDI:
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case IFT_HIPPI:
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case IFT_ISO88025:
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default:
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return hexname((u_int8_t *)LLADDR(sdl), (size_t)sdl->sdl_alen,
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host, hostlen);
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}
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}
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static int
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hexname(const u_int8_t *cp, size_t len, char *host, size_t hostlen)
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{
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int i, n;
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char *outp = host;
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*outp = '\0';
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for (i = 0; i < len; i++) {
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n = snprintf(outp, hostlen, "%s%02x",
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i ? ":" : "", cp[i]);
|
|
if (n < 0 || n >= hostlen) {
|
|
*host = '\0';
|
|
return EAI_MEMORY;
|
|
}
|
|
outp += n;
|
|
hostlen -= n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* getnameinfo_un():
|
|
* Format a UNIX IPC domain address (pathname).
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
getnameinfo_un(const struct afd *afd,
|
|
const struct sockaddr *sa, socklen_t salen,
|
|
char *host, size_t hostlen, char *serv, size_t servlen, int flags)
|
|
{
|
|
size_t pathlen;
|
|
|
|
if (serv != NULL && servlen > 0)
|
|
*serv = '\0';
|
|
if (host != NULL && hostlen > 0) {
|
|
pathlen = sa->sa_len - afd->a_off;
|
|
|
|
if (pathlen + 1 > hostlen) {
|
|
*host = '\0';
|
|
return (EAI_MEMORY);
|
|
}
|
|
strlcpy(host, (const char *)sa + afd->a_off, pathlen + 1);
|
|
}
|
|
|
|
return (0);
|
|
}
|