218d76e034
2002-11-20 Ulrich Drepper <drepper@redhat.com> * inet/getnameinfo.c: Use extend_alloca where appropriate. * sysdeps/posix/getaddrinfo.c: Likewise. * include/alloca.h (extend_alloca): New define. Based on stack direction it'll try to append to the previouls allocated buffer. 2002-11-07 Thorsten Kukuk <kukuk@suse.de> * sysdeps/posix/getaddrinfo.c (gaih_inet): If AF_UNSPEC is set, use the same service for AF_INET and AF_INET6. 2002-11-19 Ulrich Drepper <drepper@redhat.com> * intl/localealias.c (read_alias_file): Use only about 400 bytes of stack space instead of 16k.
409 lines
9.9 KiB
C
409 lines
9.9 KiB
C
/* 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 <alloca.h>
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#include <errno.h>
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#include <netdb.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 <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 <bits/libc-lock.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 *
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internal_function
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nrl_domainname (void)
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{
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static char *domain;
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static int not_first;
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if (! not_first)
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{
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__libc_lock_define_initialized (static, lock);
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__libc_lock_lock (lock);
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if (! not_first)
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{
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char *c;
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struct hostent *h, th;
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size_t tmpbuflen = 1024;
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char *tmpbuf = alloca (tmpbuflen);
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int herror;
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not_first = 1;
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while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h,
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&herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
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else
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break;
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}
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if (h && (c = strchr (h->h_name, '.')))
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domain = __strdup (++c);
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else
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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, tmpbuflen))
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
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if ((c = strchr (tmpbuf, '.')))
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domain = __strdup (++c);
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else
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{
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/* We need to preserve the hostname. */
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const char *hstname = strdupa (tmpbuf);
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while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen,
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&h, &herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
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2 * tmpbuflen);
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else
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break;
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}
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if (h && (c = strchr(h->h_name, '.')))
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domain = __strdup (++c);
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else
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{
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struct in_addr in_addr;
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in_addr.s_addr = htonl (INADDR_LOOPBACK);
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while (__gethostbyaddr_r ((const char *) &in_addr,
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sizeof (struct in_addr),
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AF_INET, &th, tmpbuf,
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tmpbuflen, &h, &herror))
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{
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if (herror == NETDB_INTERNAL && errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
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2 * tmpbuflen);
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else
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break;
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}
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if (h && (c = strchr (h->h_name, '.')))
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domain = __strdup (++c);
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}
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}
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}
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}
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__libc_lock_unlock (lock);
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}
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return domain;
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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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unsigned int flags)
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{
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int serrno = errno;
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int tmpbuflen = 1024;
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int herrno;
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char *tmpbuf = alloca (tmpbuflen);
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struct hostent th;
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int ok = 0;
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if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM))
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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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switch (sa->sa_family)
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{
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case AF_LOCAL:
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if (addrlen < (socklen_t) (((struct sockaddr_un *) NULL)->sun_path))
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return EAI_FAMILY;
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break;
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case AF_INET:
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if (addrlen < sizeof (struct sockaddr_in))
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return EAI_FAMILY;
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break;
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case AF_INET6:
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if (addrlen < sizeof (struct sockaddr_in6))
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return EAI_FAMILY;
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break;
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default:
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return EAI_FAMILY;
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}
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if (host != NULL && hostlen > 0)
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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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if (!(flags & NI_NUMERICHOST))
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{
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struct hostent *h = NULL;
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if (h == NULL)
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{
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if (sa->sa_family == AF_INET6)
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr),
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sizeof(struct in6_addr),
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AF_INET6, &th, tmpbuf, tmpbuflen,
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&h, &herrno))
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{
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if (herrno == NETDB_INTERNAL)
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{
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if (errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
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2 * tmpbuflen);
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else
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{
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__set_h_errno (herrno);
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__set_errno (serrno);
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return EAI_SYSTEM;
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}
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}
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else
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{
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break;
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}
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}
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}
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else
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{
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while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr),
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sizeof(struct in_addr), AF_INET,
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&th, tmpbuf, tmpbuflen,
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&h, &herrno))
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{
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if (errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
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2 * tmpbuflen);
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else
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{
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break;
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}
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}
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}
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}
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if (h)
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{
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char *c;
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if ((flags & NI_NOFQDN)
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&& (c = nrl_domainname ())
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&& (c = strstr (h->h_name, c))
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&& (c != h->h_name) && (*(--c) == '.'))
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{
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strncpy (host, h->h_name,
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min(hostlen, (size_t) (c - h->h_name)));
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host[min(hostlen - 1, (size_t) (c - h->h_name))]
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= '\0';
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ok = 1;
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}
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else
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{
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strncpy (host, h->h_name, hostlen);
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ok = 1;
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}
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}
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}
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if (!ok)
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{
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if (flags & NI_NAMEREQD)
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{
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__set_errno (serrno);
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return EAI_NONAME;
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}
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else
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{
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const char *c;
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if (sa->sa_family == AF_INET6)
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{
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const struct sockaddr_in6 *sin6p;
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uint32_t scopeid;
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sin6p = (const struct sockaddr_in6 *) sa;
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c = inet_ntop (AF_INET6,
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(const void *) &sin6p->sin6_addr, host, hostlen);
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scopeid = sin6p->sin6_scope_id;
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if (scopeid != 0)
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{
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/* Buffer is >= IFNAMSIZ+1. */
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char scopebuf[IFNAMSIZ + 1];
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char *scopeptr;
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int ni_numericscope = 0;
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size_t real_hostlen = __strnlen (host, hostlen);
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size_t scopelen = 0;
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scopebuf[0] = SCOPE_DELIMITER;
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scopebuf[1] = '\0';
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scopeptr = &scopebuf[1];
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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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if (if_indextoname (scopeid, scopeptr) == NULL)
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++ni_numericscope;
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else
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scopelen = strlen (scopebuf);
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}
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else
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++ni_numericscope;
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if (ni_numericscope)
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scopelen = 1 + __snprintf (scopeptr,
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(scopebuf
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+ sizeof scopebuf
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- scopeptr),
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"%u", scopeid);
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if (real_hostlen + scopelen + 1 > hostlen)
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/* XXX We should not fail here. Simply enlarge
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the buffer or return with out of memory. */
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return EAI_SYSTEM;
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memcpy (host + real_hostlen, scopebuf, scopelen + 1);
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}
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}
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else
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c = inet_ntop (AF_INET,
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(const void *) &(((const struct sockaddr_in *) sa)->sin_addr),
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host, hostlen);
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if (c == NULL)
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{
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__set_errno (serrno);
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return EAI_SYSTEM;
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}
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}
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ok = 1;
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}
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break;
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case AF_LOCAL:
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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))
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{
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strncpy (host, utsname.nodename, hostlen);
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break;
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};
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};
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if (flags & NI_NAMEREQD)
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{
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__set_errno (serrno);
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return EAI_NONAME;
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}
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strncpy (host, "localhost", hostlen);
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break;
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default:
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return EAI_FAMILY;
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}
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if (serv && (servlen > 0))
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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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if (!(flags & NI_NUMERICSERV))
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{
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struct servent *s, ts;
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while (__getservbyport_r (((const struct sockaddr_in *) sa)->sin_port,
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((flags & NI_DGRAM) ? "udp" : "tcp"),
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&ts, tmpbuf, tmpbuflen, &s))
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{
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if (herrno == NETDB_INTERNAL)
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{
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if (errno == ERANGE)
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tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
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2 * tmpbuflen);
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else
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{
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__set_errno (serrno);
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return EAI_SYSTEM;
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}
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}
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else
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{
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break;
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}
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}
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if (s)
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{
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strncpy (serv, s->s_name, servlen);
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break;
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}
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}
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__snprintf (serv, servlen, "%d",
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ntohs (((const struct sockaddr_in *) sa)->sin_port));
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break;
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case AF_LOCAL:
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strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
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break;
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}
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if (host && (hostlen > 0))
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host[hostlen-1] = 0;
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if (serv && (servlen > 0))
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serv[servlen-1] = 0;
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errno = serrno;
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return 0;
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}
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libc_hidden_def (getnameinfo)
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