/*-
* Copyright (c) 1985, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* -
* --Copyright--
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
static char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <arpa/nameser.h> /* XXX */
#include <resolv.h> /* XXX */
#include <sys/fcntl.h>
#define MAXALIASES 35
static struct hostent host;
static char *host_aliases[MAXALIASES];
static char hostbuf[BUFSIZ+1];
static FILE *hostf = NULL;
static u_char host_addr[16]; /* IPv4 or IPv6 */
static char *h_addr_ptrs[2];
static int stayopen = 0;
#ifdef _THREAD_SAFE
static char* hostmap = NULL;
static unsigned int hostlen = 0;
static char *cur;
#endif
void
_sethosthtent(f)
int f;
{
if (!hostf)
hostf = fopen(_PATH_HOSTS, "r" );
else
rewind(hostf);
stayopen = f;
}
void
_endhosthtent()
{
if (hostf && !stayopen) {
(void) fclose(hostf);
hostf = NULL;
}
}
struct hostent *
gethostent()
{
char *p;
register char *cp, **q;
int af, len;
if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {
h_errno = NETDB_INTERNAL;
return (NULL);
}
again:
if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
h_errno = HOST_NOT_FOUND;
return (NULL);
}
if (*p == '#')
goto again;
if (!(cp = strpbrk(p, "#\n")))
goto again;
*cp = '\0';
if (!(cp = strpbrk(p, " \t")))
goto again;
*cp++ = '\0';
if (inet_pton(AF_INET6, p, host_addr) > 0) {
af = AF_INET6;
len = IN6ADDRSZ;
} else if (inet_pton(AF_INET, p, host_addr) > 0) {
if (_res.options & RES_USE_INET6) {
_map_v4v6_address((char*)host_addr, (char*)host_addr);
af = AF_INET6;
len = IN6ADDRSZ;
} else {
af = AF_INET;
len = INADDRSZ;
}
} else {
goto again;
}
h_addr_ptrs[0] = (char *)host_addr;
h_addr_ptrs[1] = NULL;
host.h_addr_list = h_addr_ptrs;
host.h_length = len;
host.h_addrtype = af;
while (*cp == ' ' || *cp == '\t')
cp++;
host.h_name = cp;
q = host.h_aliases = host_aliases;
if ((cp = strpbrk(cp, " \t")) != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &host_aliases[MAXALIASES - 1])
*q++ = cp;
if ((cp = strpbrk(cp, " \t")) != NULL)
*cp++ = '\0';
}
*q = NULL;
h_errno = NETDB_SUCCESS;
return (&host);
}
struct hostent *
_gethostbyhtname(name, af)
const char *name;
int af;
{
register struct hostent *p;
register char **cp;
sethostent(0);
while ((p = gethostent()) != NULL) {
if (p->h_addrtype != af)
continue;
if (strcasecmp(p->h_name, name) == 0)
break;
for (cp = p->h_aliases; *cp != 0; cp++)
if (strcasecmp(*cp, name) == 0)
goto found;
}
found:
endhostent();
return (p);
}
struct hostent *
_gethostbyhtaddr(addr, len, af)
const char *addr;
int len, af;
{
register struct hostent *p;
sethostent(0);
while ((p = gethostent()) != NULL)
if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len))
break;
endhostent();
return (p);
}
#ifdef _THREAD_SAFE
struct hostent* gethostent_r(char* buf, int len)
{
char *dest;
struct hostent* pe=(struct hostent*)buf;
char* last;
char* max=buf+len;
int aliasidx;
int curlen;
if (hostf<0) return 0;
fseek(hostf,0,SEEK_END);
curlen=ftell(hostf);
fseek(hostf,0,SEEK_SET);
if (curlen > hostlen) {
if (hostmap) {
hostmap = realloc(hostmap,curlen);
}
else {
hostmap = malloc(curlen);
}
}
hostlen = curlen;
if (hostmap) {
if (fread(hostmap,hostlen,1,hostf) != hostlen) {
hostmap=0; goto error;
}
cur=hostmap;
}
last=hostmap+hostlen;
again:
if ((size_t)len<sizeof(struct hostent)+11*sizeof(char*)) goto nospace;
dest=buf+sizeof(struct hostent);
pe->h_name=0;
pe->h_aliases=(char**)dest; pe->h_aliases[0]=0; dest+=10*sizeof(char*);
pe->h_addr_list=(char**)dest; dest+=2*sizeof(char**);
if (cur>=last) return 0;
if (*cur=='#' || *cur=='\n') goto parseerror;
/* first, the ip number */
pe->h_name=cur;
while (cur<last && !isspace(*cur)) cur++;
if (cur>=last) return 0;
if (*cur=='\n') goto parseerror;
{
char save=*cur;
*cur=0;
pe->h_addr_list[0]=dest;
pe->h_addr_list[1]=0;
if (max-dest<16) goto nospace;
if (inet_pton(AF_INET6,pe->h_name,dest)>0) {
pe->h_addrtype=AF_INET6;
pe->h_length=16;
dest+=16;
} else if (inet_pton(AF_INET,pe->h_name,dest)>0) {
pe->h_addrtype=AF_INET;
pe->h_length=4;
dest+=4;
} else {
*cur=save;
goto parseerror;
}
*cur=save;
}
++cur;
/* now the aliases */
for (aliasidx=0;aliasidx<9;++aliasidx) {
while (cur<last && isblank(*cur)) ++cur;
pe->h_aliases[aliasidx]=cur;
while (cur<last && !isspace(*cur)) ++cur;
{
char *from=pe->h_aliases[aliasidx];
int len=cur-from;
if (max-dest<len+2) goto nospace;
pe->h_aliases[aliasidx]=dest;
memmove(dest,from,(size_t)(cur-from));
dest+=len;
*dest=0; ++dest;
}
if (*cur=='\n') { ++cur; ++aliasidx; break; }
if (cur>=last || !isblank(*cur)) break;
cur++;
}
pe->h_aliases[aliasidx]=0;
pe->h_name=pe->h_aliases[0];
pe->h_aliases++;
return pe;
parseerror:
while (cur<last && *cur!='\n') cur++;
cur++;
goto again;
nospace:
errno=ERANGE;
goto __error;
error:
errno=ENOMEM;
__error:
if (hostmap!=NULL) free(hostmap);
hostmap=NULL;
return 0;
}
#endif
