gethostent_r.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 2001-2002 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1998-1999 by Internet Software Consortium.
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: gethostent_r.c,v 8.7 2001/11/01 08:02:09 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <port_before.h>
#if !defined(_REENTRANT) || !defined(DO_PTHREADS)
static int gethostent_r_not_required = 0;
#else
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <port_after.h>
#ifdef HOST_R_RETURN
static HOST_R_RETURN
copy_hostent(struct hostent *, struct hostent *, HOST_R_COPY_ARGS);
HOST_R_RETURN
gethostbyname_r(const char *name, struct hostent *hptr, HOST_R_ARGS) {
struct hostent *he = gethostbyname(name);
#ifdef HOST_R_SETANSWER
int n = 0;
#endif
HOST_R_ERRNO;
#ifdef HOST_R_SETANSWER
if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) == 0)
*answerp = NULL;
else
*answerp = hptr;
return (n);
#else
if (he == NULL)
return (HOST_R_BAD);
return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}
HOST_R_RETURN
gethostbyaddr_r(const char *addr, int len, int type,
struct hostent *hptr, HOST_R_ARGS) {
struct hostent *he = gethostbyaddr(addr, len, type);
#ifdef HOST_R_SETANSWER
int n = 0;
#endif
HOST_R_ERRNO;
#ifdef HOST_R_SETANSWER
if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) == 0)
*answerp = NULL;
else
*answerp = hptr;
return (n);
#else
if (he == NULL)
return (HOST_R_BAD);
return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}
/*
* These assume a single context is in operation per thread.
* If this is not the case we will need to call irs directly
* rather than through the base functions.
*/
HOST_R_RETURN
gethostent_r(struct hostent *hptr, HOST_R_ARGS) {
struct hostent *he = gethostent();
#ifdef HOST_R_SETANSWER
int n = 0;
#endif
HOST_R_ERRNO;
#ifdef HOST_R_SETANSWER
if (he == NULL || (n = copy_hostent(he, hptr, HOST_R_COPY)) == 0)
*answerp = NULL;
else
*answerp = hptr;
return (n);
#else
if (he == NULL)
return (HOST_R_BAD);
return (copy_hostent(he, hptr, HOST_R_COPY));
#endif
}
HOST_R_SET_RETURN
#ifdef HOST_R_ENT_ARGS
sethostent_r(int stay_open, HOST_R_ENT_ARGS)
#else
sethostent_r(int stay_open)
#endif
{
sethostent(stay_open);
#ifdef HOST_R_SET_RESULT
return (HOST_R_SET_RESULT);
#endif
}
HOST_R_END_RETURN
#ifdef HOST_R_ENT_ARGS
endhostent_r(HOST_R_ENT_ARGS)
#else
endhostent_r(void)
#endif
{
endhostent();
HOST_R_END_RESULT(HOST_R_OK);
}
/* Private */
#ifndef HOSTENT_DATA
static HOST_R_RETURN
copy_hostent(struct hostent *he, struct hostent *hptr, HOST_R_COPY_ARGS) {
char *cp;
char **ptr;
int i, n;
int nptr, len;
/* Find out the amount of space required to store the answer. */
nptr = 2; /* NULL ptrs */
len = (char *)ALIGN(buf) - buf;
for (i = 0; he->h_addr_list[i]; i++, nptr++) {
len += he->h_length;
}
for (i = 0; he->h_aliases[i]; i++, nptr++) {
len += strlen(he->h_aliases[i]) + 1;
}
len += strlen(he->h_name) + 1;
len += nptr * sizeof(char*);
if (len > buflen) {
errno = ERANGE;
return (HOST_R_BAD);
}
/* copy address size and type */
hptr->h_addrtype = he->h_addrtype;
n = hptr->h_length = he->h_length;
ptr = (char **)ALIGN(buf);
cp = (char *)ALIGN(buf) + nptr * sizeof(char *);
/* copy address list */
hptr->h_addr_list = ptr;
for (i = 0; he->h_addr_list[i]; i++ , ptr++) {
memcpy(cp, he->h_addr_list[i], n);
hptr->h_addr_list[i] = cp;
cp += n;
}
hptr->h_addr_list[i] = NULL;
ptr++;
/* copy official name */
n = strlen(he->h_name) + 1;
strcpy(cp, he->h_name);
hptr->h_name = cp;
cp += n;
/* copy aliases */
hptr->h_aliases = ptr;
for (i = 0 ; he->h_aliases[i]; i++) {
n = strlen(he->h_aliases[i]) + 1;
strcpy(cp, he->h_aliases[i]);
hptr->h_aliases[i] = cp;
cp += n;
}
hptr->h_aliases[i] = NULL;
return (HOST_R_OK);
}
#else /* !HOSTENT_DATA */
static int
copy_hostent(struct hostent *he, struct hostent *hptr, HOST_R_COPY_ARGS) {
char *cp, *eob;
int i, n;
/* copy address size and type */
hptr->h_addrtype = he->h_addrtype;
n = hptr->h_length = he->h_length;
/* copy up to first 35 addresses */
i = 0;
cp = hdptr->hostaddr;
eob = hdptr->hostaddr + sizeof(hdptr->hostaddr);
hptr->h_addr_list = hdptr->h_addr_ptrs;
while (he->h_addr_list[i] && i < (_MAXADDRS)) {
if (n < (eob - cp)) {
memcpy(cp, he->h_addr_list[i], n);
hptr->h_addr_list[i] = cp;
cp += n;
} else {
break;
}
i++;
}
hptr->h_addr_list[i] = NULL;
/* copy official name */
cp = hdptr->hostbuf;
eob = hdptr->hostbuf + sizeof(hdptr->hostbuf);
if ((n = strlen(he->h_name) + 1) < (eob - cp)) {
strcpy(cp, he->h_name);
hptr->h_name = cp;
cp += n;
} else {
return (-1);
}
/* copy aliases */
i = 0;
hptr->h_aliases = hdptr->host_aliases;
while (he->h_aliases[i] && i < (_MAXALIASES-1)) {
if ((n = strlen(he->h_aliases[i]) + 1) < (eob - cp)) {
strcpy(cp, he->h_aliases[i]);
hptr->h_aliases[i] = cp;
cp += n;
} else {
break;
}
i++;
}
hptr->h_aliases[i] = NULL;
return (HOST_R_OK);
}
#endif /* !HOSTENT_DATA */
#else /* HOST_R_RETURN */
static int gethostent_r_unknown_system = 0;
#endif /* HOST_R_RETURN */
#endif /* !defined(_REENTRANT) || !defined(DO_PTHREADS) */