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8053080cbc
Now when tcp_wrapper is enabled by inetd -wW,
several accesses which should be permitted are refused only for IPv6,
if hostname is used to decide the host to be allowed.
IPv6 users will be just upset.
About security related concern.
-All extensions are wrapped by #ifdef INET6, so people can completely
disable the extension by recompile libwrap without INET6 option.
-Access via IPv6 is not enabled by default.
People need to enable IPv6 access by changing /etc/inetd.conf at first,
by adding tcp6 and/or tcp46 entries.
-The base of patches are from KAME package and are actually daily used
for more than a year in several Japanese IPv6 environments.
-Patches are reviewed by markm.
Approved by: jkh
Submitted by: Hajimu UMEMOTO <ume@mahoroba.org>
Reviewed by: markm
Obtained from: KAME project
111 lines
1.9 KiB
C
111 lines
1.9 KiB
C
/*
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* Misc routines that are used by tcpd and by tcpdchk.
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <string.h>
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#include "tcpd.h"
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extern char *fgets();
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#ifndef INADDR_NONE
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#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
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#endif
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/* xgets - fgets() with backslash-newline stripping */
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char *xgets(ptr, len, fp)
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char *ptr;
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int len;
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FILE *fp;
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{
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int got;
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char *start = ptr;
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while (fgets(ptr, len, fp)) {
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got = strlen(ptr);
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if (got >= 1 && ptr[got - 1] == '\n') {
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tcpd_context.line++;
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if (got >= 2 && ptr[got - 2] == '\\') {
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got -= 2;
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} else {
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return (start);
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}
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}
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ptr += got;
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len -= got;
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ptr[0] = 0;
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}
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return (ptr > start ? start : 0);
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}
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/* split_at - break string at delimiter or return NULL */
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char *split_at(string, delimiter)
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char *string;
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int delimiter;
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{
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char *cp;
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#ifdef INET6
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int bracket = 0;
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for (cp = string; cp && *cp; cp++) {
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switch (*cp) {
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case '[':
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bracket++;
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break;
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case ']':
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bracket--;
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break;
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default:
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if (bracket == 0 && *cp == delimiter) {
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*cp++ = 0;
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return cp;
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}
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break;
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}
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}
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return (NULL);
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#else
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if ((cp = strchr(string, delimiter)) != 0)
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*cp++ = 0;
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return (cp);
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#endif
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}
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/* dot_quad_addr - convert dotted quad to internal form */
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unsigned long dot_quad_addr(str)
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char *str;
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{
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int in_run = 0;
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int runs = 0;
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char *cp = str;
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/* Count the number of runs of non-dot characters. */
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while (*cp) {
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if (*cp == '.') {
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in_run = 0;
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} else if (in_run == 0) {
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in_run = 1;
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runs++;
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}
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cp++;
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}
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return (runs == 4 ? inet_addr(str) : INADDR_NONE);
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}
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