freebsd-dev/usr.sbin/ppp/iplist.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

228 lines
5.5 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include "log.h"
#include "defs.h"
#include "iplist.h"
static int
do_inet_aton(const char *start, const char *end, struct in_addr *ip)
{
char ipstr[16];
if (end - start > 15) {
log_Printf(LogWARN, "%.*s: Invalid IP address\n", (int)(end-start), start);
return 0;
}
strncpy(ipstr, start, end-start);
ipstr[end-start] = '\0';
return inet_aton(ipstr, ip);
}
static void
iplist_first(struct iplist *list)
{
list->cur.pos = -1;
}
static int
iplist_setrange(struct iplist *list, char *range)
{
char *ptr, *to;
if ((ptr = strpbrk(range, ",-")) == NULL) {
if (!inet_aton(range, &list->cur.ip))
return 0;
list->cur.lstart = ntohl(list->cur.ip.s_addr);
list->cur.nItems = 1;
} else {
if (!do_inet_aton(range, ptr, &list->cur.ip))
return 0;
if (*ptr == ',') {
list->cur.lstart = ntohl(list->cur.ip.s_addr);
list->cur.nItems = 1;
} else {
struct in_addr endip;
to = ptr+1;
if ((ptr = strpbrk(to, ",-")) == NULL)
ptr = to + strlen(to);
if (*to == '-')
return 0;
if (!do_inet_aton(to, ptr, &endip))
return 0;
list->cur.lstart = ntohl(list->cur.ip.s_addr);
list->cur.nItems = ntohl(endip.s_addr) - list->cur.lstart + 1;
if (list->cur.nItems < 1)
return 0;
}
}
list->cur.srcitem = 0;
list->cur.srcptr = range;
return 1;
}
static int
iplist_nextrange(struct iplist *list)
{
char *ptr, *to, *end;
ptr = list->cur.srcptr;
if (ptr != NULL && (ptr = strchr(ptr, ',')) != NULL)
ptr++;
else
ptr = list->src;
while (*ptr != '\0' && !iplist_setrange(list, ptr)) {
if ((end = strchr(ptr, ',')) == NULL)
end = ptr + strlen(ptr);
if (end == ptr)
return 0;
log_Printf(LogWARN, "%.*s: Invalid IP range (skipping)\n",
(int)(end - ptr), ptr);
to = ptr;
do
*to = *end++;
while (*to++ != '\0');
if (*ptr == '\0')
ptr = list->src;
}
return 1;
}
struct in_addr
iplist_next(struct iplist *list)
{
if (list->cur.pos == -1) {
list->cur.srcptr = NULL;
if (!iplist_nextrange(list)) {
list->cur.ip.s_addr = INADDR_ANY;
return list->cur.ip;
}
} else if (++list->cur.srcitem == list->cur.nItems) {
if (!iplist_nextrange(list)) {
list->cur.ip.s_addr = INADDR_ANY;
list->cur.pos = -1;
return list->cur.ip;
}
} else
list->cur.ip.s_addr = htonl(list->cur.lstart + list->cur.srcitem);
list->cur.pos++;
return list->cur.ip;
}
int
iplist_setsrc(struct iplist *list, const char *src)
{
strncpy(list->src, src, sizeof list->src - 1);
list->src[sizeof list->src - 1] = '\0';
list->cur.srcptr = list->src;
do {
if (iplist_nextrange(list))
list->nItems += list->cur.nItems;
else
return 0;
} while (list->cur.srcptr != list->src);
return 1;
}
void
iplist_reset(struct iplist *list)
{
list->src[0] = '\0';
list->nItems = 0;
list->cur.pos = -1;
}
struct in_addr
iplist_setcurpos(struct iplist *list, long pos)
{
if (pos < 0 || (unsigned)pos >= list->nItems) {
list->cur.pos = -1;
list->cur.ip.s_addr = INADDR_ANY;
return list->cur.ip;
}
list->cur.srcptr = NULL;
list->cur.pos = 0;
while (1) {
iplist_nextrange(list);
if (pos < (int)list->cur.nItems) {
if (pos) {
list->cur.srcitem = pos;
list->cur.pos += pos;
list->cur.ip.s_addr = htonl(list->cur.lstart + list->cur.srcitem);
}
break;
}
pos -= list->cur.nItems;
list->cur.pos += list->cur.nItems;
}
return list->cur.ip;
}
struct in_addr
iplist_setrandpos(struct iplist *list)
{
randinit();
return iplist_setcurpos(list, random() % list->nItems);
}
int
iplist_ip2pos(struct iplist *list, struct in_addr ip)
{
struct iplist_cur cur;
u_long f;
int result;
result = -1;
memcpy(&cur, &list->cur, sizeof cur);
for (iplist_first(list), f = 0; f < list->nItems; f++)
if (iplist_next(list).s_addr == ip.s_addr) {
result = list->cur.pos;
break;
}
memcpy(&list->cur, &cur, sizeof list->cur);
return result;
}