Date: Fri, 14 Nov 1997 20:24:42 -0800 (PST) From: pavlin@catarina.usc.edu To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/5047: ipfw(8) IP address resolving problem if only /etc/hosts used Message-ID: <199711150424.UAA28485@hub.freebsd.org> Resent-Message-ID: <199711150430.UAA28828@hub.freebsd.org>
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>Number: 5047
>Category: bin
>Synopsis: ipfw(8) IP address resolving problem if only /etc/hosts used
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Nov 14 20:30:00 PST 1997
>Last-Modified:
>Originator: Pavlin Ivanov Radoslavov
>Organization:
University of Southern California, Dept. of CS
>Release: 2.2.1
>Environment:
FreeBSD fbsd14.usc.edu 2.2.1-RELEASE FreeBSD 2.2.1-RELEASE #0: Mon Sep 1 23:11:02 PDT 1997 pim@fbsd14.usc.edu:/usr/home/local/pim/sys/compile/FBSD i386
>Description:
If only /etc/hosts is used to resolve hosts names, ipfw does not accept
IP addresses, only hosts names.
>How-To-Repeat:
1. Recompile the kernel with IP firewall enabled
(options IPFIREWALL) and reboot
2. Comment out "bind" and "nis", and uncomment "hosts" in /etc/host.conf
3. Execute the following three lines (from the console!):
/sbin/ipfw -f flush
/sbin/ipfw add 65000 pass all from any to any
/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
>Fix:
Apply the following patch to /usr/src/sbin/ipfw/ipfw.c
--- ipfw.c Wed Mar 5 04:30:08 1997
+++ ipfw-new.c Fri Nov 14 19:56:13 1997
@@ -386,8 +386,13 @@
{
struct hostent *he = gethostbyname(host);
- if (!he)
- return(-1);
+ if (!he) {
+ u_long host_addr;
+ host_addr = inet_addr(host);
+ he = gethostbyaddr((char *)&host_addr, sizeof(u_long), AF_INET);
+ if (!he)
+ return(-1);
+ }
*ipaddr = *(struct in_addr *)he->h_addr_list[0];
>Audit-Trail:
>Unformatted:
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