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Issue a warning if the user specifies an invalid interface in a rule.

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The rule is still added to the chain since the interface may get
created later on after loading an LKM.
This commit is contained in:
Alexander Langer 1996-10-17 01:05:03 +00:00
parent 0d4453d303
commit bf41740b43
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18972
1 changed files with 25 additions and 1 deletions
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26
sbin/ipfw/ipfw.c
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@ -16,7 +16,7 @@
*
* NEW command line interface for IP firewall facility
*
* $Id: ipfw.c,v 1.32 1996/08/13 19:43:24 pst Exp $
* $Id: ipfw.c,v 1.33 1996/08/31 17:58:23 nate Exp $
*
*/
@ -31,6 +31,8 @@
#include <time.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip_fw.h>
#include <netinet/tcp.h>
@ -594,6 +596,26 @@ delete(ac,av)
err(1,"setsockopt(IP_FW_DEL)");
}
int
verify_interface(rule)
struct ip_fw *rule;
{
struct ifreq ifr;
/*
* If a unit was specified, check for that exact interface.
* If a wildcard was specified, check for unit 0.
*/
snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d",
rule->fw_via_name,
rule->fw_flg & IP_FW_F_IFUWILD ? 0 : rule->fw_via_unit);
if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0)
return(-1); /* interface isn't recognized by the kernel */
return(0); /* interface exists */
}
void
add(ac,av)
int ac;
@ -706,6 +728,8 @@ add(ac,av)
rule.fw_via_unit = atoi(q);
*q = '\0';
rule.fw_flg |= IP_FW_F_IFNAME;
if (verify_interface(&rule) != 0)
fprintf(stderr, "Warning: interface does not exist\n");
} else if (inet_aton(*av,&rule.fw_via_ip) == INADDR_NONE) {
show_usage("bad IP# after via\n");
}