NetBSD/dist/bind/lib/irs/lcl_pr.c

287 lines
7.1 KiB
C

/* $NetBSD: lcl_pr.c,v 1.1.1.1 1999/11/20 18:54:10 veego Exp $ */
/*
* 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_pr.c,v 1.18 1999/10/13 17:11:20 vixie Exp";
#endif /* LIBC_SCCS and not lint */
/* extern */
#include "port_before.h"
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <irs.h>
#include <isc/memcluster.h>
#include "port_after.h"
#include "irs_p.h"
#include "lcl_p.h"
#ifndef _PATH_PROTOCOLS
#define _PATH_PROTOCOLS "/etc/protocols"
#endif
#define MAXALIASES 35
/* Types */
struct pvt {
FILE * fp;
char line[BUFSIZ+1];
struct protoent proto;
char * proto_aliases[MAXALIASES];
};
/* Forward */
static void pr_close(struct irs_pr *);
static struct protoent * pr_next(struct irs_pr *);
static struct protoent * pr_byname(struct irs_pr *, const char *);
static struct protoent * pr_bynumber(struct irs_pr *, int);
static void pr_rewind(struct irs_pr *);
static void pr_minimize(struct irs_pr *);
/* Portability. */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
/* Public */
struct irs_pr *
irs_lcl_pr(struct irs_acc *this) {
struct irs_pr *pr;
struct pvt *pvt;
if (!(pr = memget(sizeof *pr))) {
errno = ENOMEM;
return (NULL);
}
if (!(pvt = memget(sizeof *pvt))) {
memput(pr, sizeof *this);
errno = ENOMEM;
return (NULL);
}
memset(pvt, 0, sizeof *pvt);
pr->private = pvt;
pr->close = pr_close;
pr->byname = pr_byname;
pr->bynumber = pr_bynumber;
pr->next = pr_next;
pr->rewind = pr_rewind;
pr->minimize = pr_minimize;
pr->res_get = NULL;
pr->res_set = NULL;
return (pr);
}
/* Methods */
static void
pr_close(struct irs_pr *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->fp)
(void) fclose(pvt->fp);
memput(pvt, sizeof *pvt);
memput(this, sizeof *this);
}
static struct protoent *
pr_byname(struct irs_pr *this, const char *name) {
struct protoent *p;
char **cp;
pr_rewind(this);
while ((p = pr_next(this))) {
if (!strcmp(p->p_name, name))
goto found;
for (cp = p->p_aliases; *cp; cp++)
if (!strcmp(*cp, name))
goto found;
}
found:
return (p);
}
static struct protoent *
pr_bynumber(struct irs_pr *this, int proto) {
struct protoent *p;
pr_rewind(this);
while ((p = pr_next(this)))
if (p->p_proto == proto)
break;
return (p);
}
static void
pr_rewind(struct irs_pr *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_PROTOCOLS, "r" )))
return;
if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
}
static struct protoent *
pr_next(struct irs_pr *this) {
struct pvt *pvt = (struct pvt *)this->private;
char *p, *cp, **q;
char *bufp, *ndbuf, *dbuf = NULL;
int c, bufsiz, offset;
if (!pvt->fp)
pr_rewind(this);
if (!pvt->fp)
return (NULL);
bufp = pvt->line;
bufsiz = BUFSIZ;
offset = 0;
again:
if ((p = fgets(bufp + offset, bufsiz - offset, pvt->fp)) == NULL) {
if (dbuf)
free(dbuf);
return (NULL);
}
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->proto.p_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->proto.p_proto = atoi(cp);
q = pvt->proto.p_aliases = pvt->proto_aliases;
if (p != NULL) {
cp = p;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &pvt->proto_aliases[MAXALIASES - 1])
*q++ = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
}
*q = NULL;
return (&pvt->proto);
}
static void
pr_minimize(struct irs_pr *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->fp != NULL) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
}