freebsd-dev/contrib/bind/lib/irs/lcl_nw.c
2002-02-04 19:12:46 +00:00

372 lines
9.0 KiB
C

/*
* Copyright (c) 1989, 1993, 1995
* 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) 1996-1999 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: lcl_nw.c,v 1.22 2001/05/29 05:49:07 marka Exp $";
/* from getgrent.c 8.2 (Berkeley) 3/21/94"; */
/* from BSDI Id: getgrent.c,v 2.8 1996/05/28 18:15:14 bostic Exp $ */
#endif /* LIBC_SCCS and not lint */
/* Imports */
#include "port_before.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <fcntl.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <irs.h>
#include <isc/memcluster.h>
#include "port_after.h"
#include <isc/misc.h>
#include "irs_p.h"
#include "lcl_p.h"
#define MAXALIASES 35
#define MAXADDRSIZE 4
struct pvt {
FILE * fp;
char line[BUFSIZ+1];
struct nwent net;
char * aliases[MAXALIASES];
char addr[MAXADDRSIZE];
struct __res_state * res;
void (*free_res)(void *);
};
/* Forward */
static void nw_close(struct irs_nw *);
static struct nwent * nw_byname(struct irs_nw *, const char *, int);
static struct nwent * nw_byaddr(struct irs_nw *, void *, int, int);
static struct nwent * nw_next(struct irs_nw *);
static void nw_rewind(struct irs_nw *);
static void nw_minimize(struct irs_nw *);
static struct __res_state * nw_res_get(struct irs_nw *this);
static void nw_res_set(struct irs_nw *this,
struct __res_state *res,
void (*free_res)(void *));
static int init(struct irs_nw *this);
/* Portability. */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
/* Public */
struct irs_nw *
irs_lcl_nw(struct irs_acc *this) {
struct irs_nw *nw;
struct pvt *pvt;
UNUSED(this);
if (!(pvt = memget(sizeof *pvt))) {
errno = ENOMEM;
return (NULL);
}
memset(pvt, 0, sizeof *pvt);
if (!(nw = memget(sizeof *nw))) {
memput(pvt, sizeof *pvt);
errno = ENOMEM;
return (NULL);
}
memset(nw, 0x5e, sizeof *nw);
nw->private = pvt;
nw->close = nw_close;
nw->byname = nw_byname;
nw->byaddr = nw_byaddr;
nw->next = nw_next;
nw->rewind = nw_rewind;
nw->minimize = nw_minimize;
nw->res_get = nw_res_get;
nw->res_set = nw_res_set;
return (nw);
}
/* Methods */
static void
nw_close(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
nw_minimize(this);
if (pvt->res && pvt->free_res)
(*pvt->free_res)(pvt->res);
if (pvt->fp)
(void)fclose(pvt->fp);
memput(pvt, sizeof *pvt);
memput(this, sizeof *this);
}
static struct nwent *
nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
struct nwent *p;
if (init(this) == -1)
return(NULL);
nw_rewind(this);
while ((p = nw_next(this)) != NULL)
if (p->n_addrtype == type && p->n_length == length)
if (bitncmp(p->n_addr, net, length) == 0)
break;
return (p);
}
static struct nwent *
nw_byname(struct irs_nw *this, const char *name, int type) {
struct nwent *p;
char **ap;
if (init(this) == -1)
return(NULL);
nw_rewind(this);
while ((p = nw_next(this)) != NULL) {
if (ns_samename(p->n_name, name) == 1 &&
p->n_addrtype == type)
break;
for (ap = p->n_aliases; *ap; ap++)
if ((ns_samename(*ap, name) == 1) &&
(p->n_addrtype == type))
goto found;
}
found:
return (p);
}
static void
nw_rewind(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->fp) {
if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
return;
(void)fclose(pvt->fp);
}
if (!(pvt->fp = fopen(_PATH_NETWORKS, "r")))
return;
if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
}
static struct nwent *
nw_next(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct nwent *ret = NULL;
char *p, *cp, **q;
char *bufp, *ndbuf, *dbuf = NULL;
int c, bufsiz, offset = 0;
if (init(this) == -1)
return(NULL);
if (pvt->fp == NULL)
nw_rewind(this);
if (pvt->fp == NULL) {
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
return (NULL);
}
bufp = pvt->line;
bufsiz = sizeof(pvt->line);
again:
p = fgets(bufp + offset, bufsiz - offset, pvt->fp);
if (p == NULL)
goto cleanup;
if (!strchr(p, '\n') && !feof(pvt->fp)) {
#define GROWBUF 1024
/* allocate space for longer line */
if (dbuf == NULL) {
if ((ndbuf = malloc(bufsiz + GROWBUF)) != NULL)
strcpy(ndbuf, bufp);
} else
ndbuf = realloc(dbuf, bufsiz + GROWBUF);
if (ndbuf) {
dbuf = ndbuf;
bufp = dbuf;
bufsiz += GROWBUF;
offset = strlen(dbuf);
} else {
/* allocation failed; skip this long line */
while ((c = getc(pvt->fp)) != EOF)
if (c == '\n')
break;
if (c != EOF)
ungetc(c, pvt->fp);
}
goto again;
}
p -= offset;
offset = 0;
if (*p == '#')
goto again;
cp = strpbrk(p, "#\n");
if (cp != NULL)
*cp = '\0';
pvt->net.n_name = p;
cp = strpbrk(p, " \t");
if (cp == NULL)
goto again;
*cp++ = '\0';
while (*cp == ' ' || *cp == '\t')
cp++;
p = strpbrk(cp, " \t");
if (p != NULL)
*p++ = '\0';
pvt->net.n_length = inet_net_pton(AF_INET, cp, pvt->addr,
sizeof pvt->addr);
if (pvt->net.n_length < 0)
goto again;
pvt->net.n_addrtype = AF_INET;
pvt->net.n_addr = pvt->addr;
q = pvt->net.n_aliases = pvt->aliases;
if (p != NULL) {
cp = p;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &pvt->aliases[MAXALIASES - 1])
*q++ = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
}
*q = NULL;
ret = &pvt->net;
cleanup:
if (dbuf)
free(dbuf);
return (ret);
}
static void
nw_minimize(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->res)
res_nclose(pvt->res);
if (pvt->fp != NULL) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
}
static struct __res_state *
nw_res_get(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res) {
struct __res_state *res;
res = (struct __res_state *)malloc(sizeof *res);
if (!res) {
errno = ENOMEM;
return (NULL);
}
memset(res, 0, sizeof *res);
nw_res_set(this, res, free);
}
return (pvt->res);
}
static void
nw_res_set(struct irs_nw *this, struct __res_state *res,
void (*free_res)(void *)) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->res && pvt->free_res) {
res_nclose(pvt->res);
(*pvt->free_res)(pvt->res);
}
pvt->res = res;
pvt->free_res = free_res;
}
static int
init(struct irs_nw *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res && !nw_res_get(this))
return (-1);
if (((pvt->res->options & RES_INIT) == 0) &&
res_ninit(pvt->res) == -1)
return (-1);
return (0);
}