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562 lines
15 KiB
C
562 lines
15 KiB
C
/* Convert socket address to string using Name Service Switch modules.
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Copyright (C) 1997-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* The Inner Net License, Version 2.00
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The author(s) grant permission for redistribution and use in source and
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binary forms, with or without modification, of the software and documentation
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provided that the following conditions are met:
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0. If you receive a version of the software that is specifically labelled
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as not being for redistribution (check the version message and/or README),
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you are not permitted to redistribute that version of the software in any
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way or form.
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1. All terms of the all other applicable copyrights and licenses must be
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followed.
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2. Redistributions of source code must retain the authors' copyright
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notice(s), this list of conditions, and the following disclaimer.
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3. Redistributions in binary form must reproduce the authors' copyright
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notice(s), 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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4. [The copyright holder has authorized the removal of this clause.]
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5. Neither the name(s) of the author(s) 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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THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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If these license terms cause you a real problem, contact the author. */
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/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
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#include <errno.h>
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#include <netdb.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/utsname.h>
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#include <libc-lock.h>
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#include <scratch_buffer.h>
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#include <inet/net-internal.h>
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#include <set-freeres.h>
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#ifndef min
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# define min(x,y) (((x) > (y)) ? (y) : (x))
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#endif /* min */
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static char *domain;
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/* Former NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES flags,
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now ignored. */
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#define DEPRECATED_NI_IDN 192
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/* Return true if no memory allocation failure happened (even if domain
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name could not be obtained) or false otherwise. */
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static bool
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nrl_domainname_core (struct scratch_buffer *tmpbuf)
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{
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char *c;
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struct hostent *h, th;
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int herror;
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while (__gethostbyname_r ("localhost", &th, tmpbuf->data, tmpbuf->length,
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&h, &herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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return false;
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}
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else
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break;
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}
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if (h != NULL && (c = strchr (h->h_name, '.')) != NULL)
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{
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domain = __strdup (++c);
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return domain != NULL;
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}
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/* The name contains no domain information. Use the name
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now to get more information. */
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while (__gethostname (tmpbuf->data, tmpbuf->length))
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if (!scratch_buffer_grow (tmpbuf))
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return false;
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if ((c = strchr (tmpbuf->data, '.')) != NULL)
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{
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domain = __strdup (++c);
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return domain != NULL;
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}
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/* We need to preserve the hostname. */
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size_t hstnamelen = strlen (tmpbuf->data) + 1;
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while (__gethostbyname_r (tmpbuf->data, &th, tmpbuf->data + hstnamelen,
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tmpbuf->length - hstnamelen, &h, &herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow_preserve (tmpbuf))
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return false;
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}
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else
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break;
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}
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if (h != NULL && (c = strchr(h->h_name, '.')) != NULL)
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{
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domain = __strdup (++c);
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return domain != NULL;
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}
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struct in_addr in_addr = { .s_addr = htonl (INADDR_LOOPBACK) };
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while (__gethostbyaddr_r ((const char *) &in_addr, sizeof (struct in_addr),
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AF_INET, &th, tmpbuf->data, tmpbuf->length, &h,
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&herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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return false;
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}
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else
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break;
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}
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if (h != NULL && (c = strchr (h->h_name, '.')) != NULL)
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{
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domain = __strdup (++c);
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return domain != NULL;
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}
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return true;
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}
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static bool
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nrl_domainname (void)
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{
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static int not_first;
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if (__glibc_likely (atomic_load_acquire (¬_first) != 0))
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return true;
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int r = true;
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__libc_lock_define_initialized (static, lock);
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__libc_lock_lock (lock);
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if (atomic_load_relaxed (¬_first) == 0)
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{
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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if ((r = nrl_domainname_core (&tmpbuf)))
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atomic_store_release (¬_first, 1);
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scratch_buffer_free (&tmpbuf);
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}
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__libc_lock_unlock (lock);
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return r;
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};
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/* Copy a string to a destination buffer with length checking. Return
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EAI_OVERFLOW if the buffer is not large enough, and 0 on
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success. */
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static int
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checked_copy (char *dest, size_t destlen, const char *source)
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{
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size_t source_length = strlen (source);
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if (source_length + 1 > destlen)
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return EAI_OVERFLOW;
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memcpy (dest, source, source_length + 1);
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return 0;
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}
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/* Helper function for CHECKED_SNPRINTF below. */
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static int
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check_sprintf_result (int result, size_t destlen)
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{
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if (result < 0)
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return EAI_SYSTEM;
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if ((size_t) result >= destlen)
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/* If ret == destlen, there was no room for the terminating NUL
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character. */
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return EAI_OVERFLOW;
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return 0;
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}
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/* Format a string in the destination buffer. Return 0 on success,
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EAI_OVERFLOW in case the buffer is too small, or EAI_SYSTEM on any
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other error. */
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#define CHECKED_SNPRINTF(dest, destlen, format, ...) \
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check_sprintf_result \
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(__snprintf (dest, destlen, format, __VA_ARGS__), destlen)
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/* Convert host name, AF_INET/AF_INET6 case, name only. */
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static int
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gni_host_inet_name (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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int herrno;
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struct hostent th;
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struct hostent *h = NULL;
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if (sa->sa_family == AF_INET6)
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{
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const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
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while (__gethostbyaddr_r (&sin6p->sin6_addr, sizeof(struct in6_addr),
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AF_INET6, &th, tmpbuf->data, tmpbuf->length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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else
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{
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const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
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while (__gethostbyaddr_r (&sinp->sin_addr, sizeof(struct in_addr),
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AF_INET, &th, tmpbuf->data, tmpbuf->length,
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&h, &herrno))
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if (herrno == NETDB_INTERNAL && errno == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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{
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__set_h_errno (herrno);
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return EAI_MEMORY;
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}
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}
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else
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break;
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}
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if (h == NULL)
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{
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if (herrno == NETDB_INTERNAL)
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{
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__set_h_errno (herrno);
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return EAI_SYSTEM;
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}
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if (herrno == TRY_AGAIN)
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{
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__set_h_errno (herrno);
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return EAI_AGAIN;
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}
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}
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if (h)
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{
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if (flags & NI_NOFQDN)
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{
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if (!nrl_domainname ())
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return EAI_MEMORY;
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char *c = domain;
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if (c != NULL && (c = strstr (h->h_name, c))
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&& (c != h->h_name) && (*(--c) == '.'))
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/* Terminate the string after the prefix. */
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*c = '\0';
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}
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/* If requested, convert from the IDN format. */
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bool do_idn = flags & NI_IDN;
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char *h_name;
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if (do_idn)
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{
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int rc = __idna_from_dns_encoding (h->h_name, &h_name);
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if (rc == EAI_IDN_ENCODE)
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/* Use the punycode name as a fallback. */
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do_idn = false;
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else if (rc != 0)
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return rc;
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}
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if (!do_idn)
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h_name = h->h_name;
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size_t len = strlen (h_name) + 1;
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if (len > hostlen)
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return EAI_OVERFLOW;
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memcpy (host, h_name, len);
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if (do_idn)
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free (h_name);
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return 0;
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}
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return EAI_NONAME;
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}
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/* Convert host name, AF_INET/AF_INET6 case, numeric conversion. */
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static int
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gni_host_inet_numeric (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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if (sa->sa_family == AF_INET6)
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{
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const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
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if (inet_ntop (AF_INET6, &sin6p->sin6_addr, host, hostlen) == NULL)
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return EAI_OVERFLOW;
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uint32_t scopeid = sin6p->sin6_scope_id;
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if (scopeid != 0)
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{
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size_t used_hostlen = __strnlen (host, hostlen);
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/* Location of the scope string in the host buffer. */
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char *scope_start = host + used_hostlen;
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size_t scope_length = hostlen - used_hostlen;
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if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
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|| IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
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{
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char scopebuf[IFNAMSIZ];
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if (if_indextoname (scopeid, scopebuf) != NULL)
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return CHECKED_SNPRINTF
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(scope_start, scope_length,
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"%c%s", SCOPE_DELIMITER, scopebuf);
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}
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return CHECKED_SNPRINTF
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(scope_start, scope_length, "%c%u", SCOPE_DELIMITER, scopeid);
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}
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}
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else
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{
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const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
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if (inet_ntop (AF_INET, &sinp->sin_addr, host, hostlen) == NULL)
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return EAI_OVERFLOW;
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}
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return 0;
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}
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/* Convert AF_INET or AF_INET6 socket address, host part. */
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static int
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gni_host_inet (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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if (!(flags & NI_NUMERICHOST))
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{
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int result = gni_host_inet_name
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(tmpbuf, sa, addrlen, host, hostlen, flags);
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if (result != EAI_NONAME)
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return result;
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}
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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else
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return gni_host_inet_numeric
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(tmpbuf, sa, addrlen, host, hostlen, flags);
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}
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/* Convert AF_LOCAL socket address, host part. */
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static int
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gni_host_local (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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if (!(flags & NI_NUMERICHOST))
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{
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struct utsname utsname;
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if (uname (&utsname) == 0)
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return checked_copy (host, hostlen, utsname.nodename);
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}
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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return checked_copy (host, hostlen, "localhost");
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}
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/* Convert the host part of an AF_LOCAK socket address. */
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static int
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gni_host (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *host, socklen_t hostlen, int flags)
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{
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switch (sa->sa_family)
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{
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case AF_INET:
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case AF_INET6:
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return gni_host_inet (tmpbuf, sa, addrlen, host, hostlen, flags);
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case AF_LOCAL:
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return gni_host_local (tmpbuf, sa, addrlen, host, hostlen, 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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/* Convert service to string, AF_INET and AF_INET6 variant. */
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static int
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gni_serv_inet (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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_Static_assert
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(offsetof (struct sockaddr_in, sin_port)
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== offsetof (struct sockaddr_in6, sin6_port)
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&& sizeof (((struct sockaddr_in) {}).sin_port) == sizeof (in_port_t)
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&& sizeof (((struct sockaddr_in6) {}).sin6_port) == sizeof (in_port_t),
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"AF_INET and AF_INET6 port consistency");
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const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
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if (!(flags & NI_NUMERICSERV))
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{
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struct servent *s, ts;
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int e;
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while ((e = __getservbyport_r (sinp->sin_port,
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((flags & NI_DGRAM)
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? "udp" : "tcp"), &ts,
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tmpbuf->data, tmpbuf->length, &s)))
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{
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if (e == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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return EAI_MEMORY;
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}
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else
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break;
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}
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if (s)
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return checked_copy (serv, servlen, s->s_name);
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/* Fall through to numeric conversion. */
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}
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return CHECKED_SNPRINTF (serv, servlen, "%d", ntohs (sinp->sin_port));
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}
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/* Convert service to string, AF_LOCAL variant. */
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static int
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gni_serv_local (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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return checked_copy
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(serv, servlen, ((const struct sockaddr_un *) sa)->sun_path);
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}
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/* Convert service to string, dispatching to the implementations
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above. */
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static int
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gni_serv (struct scratch_buffer *tmpbuf,
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const struct sockaddr *sa, socklen_t addrlen,
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char *serv, socklen_t servlen, int flags)
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{
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switch (sa->sa_family)
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{
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case AF_INET:
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case AF_INET6:
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return gni_serv_inet (tmpbuf, sa, addrlen, serv, servlen, flags);
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case AF_LOCAL:
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return gni_serv_local (tmpbuf, sa, addrlen, 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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int
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getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
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socklen_t hostlen, char *serv, socklen_t servlen,
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int flags)
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{
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if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM
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|NI_IDN|DEPRECATED_NI_IDN))
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return EAI_BADFLAGS;
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if (sa == NULL || addrlen < sizeof (sa_family_t))
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return EAI_FAMILY;
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if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL)
|
|
return EAI_NONAME;
|
|
|
|
switch (sa->sa_family)
|
|
{
|
|
case AF_LOCAL:
|
|
if (addrlen < (socklen_t) offsetof (struct sockaddr_un, sun_path))
|
|
return EAI_FAMILY;
|
|
break;
|
|
case AF_INET:
|
|
if (addrlen < sizeof (struct sockaddr_in))
|
|
return EAI_FAMILY;
|
|
break;
|
|
case AF_INET6:
|
|
if (addrlen < sizeof (struct sockaddr_in6))
|
|
return EAI_FAMILY;
|
|
break;
|
|
default:
|
|
return EAI_FAMILY;
|
|
}
|
|
|
|
struct scratch_buffer tmpbuf;
|
|
scratch_buffer_init (&tmpbuf);
|
|
|
|
if (host != NULL && hostlen > 0)
|
|
{
|
|
int result = gni_host (&tmpbuf, sa, addrlen, host, hostlen, flags);
|
|
if (result != 0)
|
|
{
|
|
scratch_buffer_free (&tmpbuf);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
if (serv && (servlen > 0))
|
|
{
|
|
int result = gni_serv (&tmpbuf, sa, addrlen, serv, servlen, flags);
|
|
if (result != 0)
|
|
{
|
|
scratch_buffer_free (&tmpbuf);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
scratch_buffer_free (&tmpbuf);
|
|
return 0;
|
|
}
|
|
libc_hidden_def (getnameinfo)
|
|
|
|
weak_alias (domain, __libc_getnameinfo_freemem_ptr)
|