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Change utility to accept interface name

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along with IP as "via" argument
This commit is contained in:
Ugen J.S. Antsilevich 1995-02-24 14:32:45 +00:00
parent 55088a1c1e
commit ab7d7f5827
2 changed files with 59 additions and 10 deletions
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11
sbin/ipfw/ipfw.8
View File

@ -58,8 +58,8 @@ This is <chain-entry pattern> structure:
"dst" to "src").
The <proto/addr pattern> is:
all|icmp from <src addr/mask> to <dst addr/mask> [via <addr>]
tcp[syn]|udp from <src addr/mask>[ports] to <dst addr/mask>[ports][via <addr>]
all|icmp from <src addr/mask> to <dst addr/mask> [via <via>]
tcp[syn]|udp from <src addr/mask>[ports] to <dst addr/mask>[ports][via <via>]
all matches any IP packet.
icmp,tcp and udp - packets for corresponding protocols.
tcpsyn - tcp SYN packets (which used when initiating connection).
@ -71,9 +71,10 @@ The <src addr/mask>:
[ports]: [ port,port....|port:port]
Name of service can be used instead of port numeric value.
The via <addr> is optional and may specify IP address/name of one of local
IP interfaces to match only packets coming through it.The IP given is NOT
checked,and wrong value of IP causes entry to not match anything.
The via <via> is optional and may specify IP address/domain name of local
IP interface, or interface name (e.g. ed0) to match only packets coming
through this interface.The IP or name given is NOT checked, and wrong
value of IP causes entry to not match anything.
To l[ist] command may be passed:
f[irewall] | a[ccounting] to list specific chain or none to list

58
sbin/ipfw/ipfw.c
View File

@ -23,11 +23,12 @@
#include <netdb.h>
#include <kvm.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#define IPFIREWALL
#define IPACCT
#include <netinet/ip_fw.h>
@ -335,12 +336,22 @@ else
comma = ",";
}
if (chain->fw_via.s_addr) {
if (chain->fw_flg&IP_FW_F_IFNAME && chain->fw_via_name[0]) {
char ifnb[FW_IFNLEN+1];
if (do_short)
printf("][");
else
printf(" via ");
printf(inet_ntoa(chain->fw_via));
strncpy(ifnb,chain->fw_via_name,FW_IFNLEN);
ifnb[FW_IFNLEN]='\0';
printf("%s%d",ifnb,chain->fw_via_unit);
} else
if (chain->fw_via_ip.s_addr) {
if (do_short)
printf("][");
else
printf(" via ");
printf(inet_ntoa(chain->fw_via_ip));
}
if (do_short)
printf("]\n");
@ -593,6 +604,35 @@ struct hostent *hptr;
}
int set_entry_ifname(str,frwl)
char *str;
struct ip_fw * frwl;
{
char name[IFNAMSIZ],buf[IFNAMSIZ],*sptr;
short unit;
int i;
i=0; sptr=str;
while(isalpha(*sptr++))
i++;
if (i==0)
return 1;
strncpy(name,str,i);
unit=(short)atoi(sptr);
sprintf(buf,"%s%d",name,unit);
if (strcmp(str,buf))
return 1;
strncpy(frwl->fw_via_name,name,FW_IFNLEN);
frwl->fw_via_unit=unit;
return 0;
}
void set_entry(av,frwl)
char **av;
struct ip_fw * frwl;
@ -601,7 +641,7 @@ int p_num=0,ir=0;
frwl->fw_nsp=0;
frwl->fw_ndp=0;
frwl->fw_via.s_addr=0L;
frwl->fw_via_ip.s_addr=0L;
if (strncmp(*av,S_SEP1,strlen(S_SEP1))) {
show_usage();
@ -677,7 +717,15 @@ int p_num=0,ir=0;
exit(1);
}
set_entry_ip(*av,&(frwl->fw_via),NULL);
/*
* Try first to set interface name
* from arguments.set_entry_ip() will exit on
* wrong argument.
*/
if (set_entry_ifname(*av,frwl))
set_entry_ip(*av,&(frwl->fw_via_ip),NULL);
else
flags |= IP_FW_F_IFNAME;
no_tail:
}