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Allow ipfw to look up service names from /etc/services (or NIS if turned on)

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note.. this would be dangerous if your ipfw was blocking NIS access :)

Submitted by: archie@whistle.com (Archie Cobbs)
This commit is contained in:
Julian Elischer 1997-06-23 22:32:13 +00:00
parent 5b65033c95
commit 135a88d805
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=26854
2 changed files with 47 additions and 15 deletions
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15
sbin/ipfw/ipfw.8
View File

@ -256,9 +256,7 @@ The sense of the match can be inverted by preceding an address with the
``not'' modifier, causing all other addresses to be matched instead. This
does not affect the selection of port numbers.
.Pp
With the TCP and UDP
.Em protocols ,
optional
With the TCP and UDP protocols, optional
.Em ports
may be specified as:
.Pp
@ -268,9 +266,9 @@ may be specified as:
.Pp
Service names (from
.Pa /etc/services )
may not be used instead of a numeric port value.
Also, note that a range may only be specified as the first value,
and the port list is limited to
may be used instead of numeric port values.
A range may only be specified as the first value,
and the length of the port list is limited to
.Dv IP_FW_MAX_PORTS
(as defined in
.Pa /usr/src/sys/netinet/ip_fw.h )
@ -459,8 +457,9 @@ This rule diverts all incoming packets from 192.168.2.0/24 to divert port 5000:
.Pp
.Dl ipfw divert 5000 all from 192.168.2.0/24 to any in
.Sh SEE ALSO
.Xr divert 4 ,
.Xr ip 4 ,
.Xr ipfirewall 4 ,
.Xr divert 4 ,
.Xr protocols 5 ,
.Xr services 5 ,
.Xr reboot 8 ,
@ -484,6 +483,8 @@ Incoming packet fragments diverted by
are reassembled before delivery to the socket, whereas fragments diverted via
.Ar tee
are not.
.Pp
Port aliases containing dashes cannot be first in a list.
.Sh AUTHORS
Ugen J. S. Antsilevich,
Poul-Henning Kamp,

47
sbin/ipfw/ipfw.c
View File

@ -16,7 +16,7 @@
*
* NEW command line interface for IP firewall facility
*
* $Id: ipfw.c,v 1.43 1997/06/02 05:02:33 julian Exp $
* $Id: ipfw.c,v 1.44 1997/06/13 06:27:12 charnier Exp $
*
*/
@ -548,6 +548,37 @@ add_port(cnt, ptr, off, port)
(*cnt)++;
}
static int
lookup_port(const char *arg, int test, int nodash)
{
int val;
char *earg, buf[32];
struct servent *s;
snprintf(buf, sizeof(buf), "%s", arg);
buf[strcspn(arg, nodash ? "-," : ",")] = 0;
val = (int) strtoul(buf, &earg, 0);
if (!*buf || *earg) {
setservent(1);
if ((s = getservbyname(buf, NULL))) {
val = htons(s->s_port);
} else {
if (!test) {
errx(1, "unknown port ``%s''", arg);
}
val = -1;
}
} else {
if (val < 0 || val > 0xffff) {
if (!test) {
errx(1, "port ``%s'' out of range", arg);
}
val = -1;
}
}
return(val);
}
int
fill_port(cnt, ptr, off, arg)
u_short *cnt, *ptr, off;
@ -556,17 +587,17 @@ fill_port(cnt, ptr, off, arg)
char *s;
int initial_range = 0;
s = strchr(arg,'-');
if (s) {
s = arg + strcspn(arg, "-,"); /* first port name can't have a dash */
if (*s == '-') {
*s++ = '\0';
if (strchr(arg, ','))
errx(1, "port range must be first in list");
add_port(cnt, ptr, off, *arg ? atoi(arg) : 0x0000);
add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0x0000);
arg = s;
s = strchr(arg,',');
if (s)
*s++ = '\0';
add_port(cnt, ptr, off, *arg ? atoi(arg) : 0xffff);
add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0xffff);
arg = s;
initial_range = 1;
}
@ -574,7 +605,7 @@ fill_port(cnt, ptr, off, arg)
s = strchr(arg,',');
if (s)
*s++ = '\0';
add_port(cnt, ptr, off, atoi(arg));
add_port(cnt, ptr, off, lookup_port(arg, 0, 0));
arg = s;
}
return initial_range;
@ -843,7 +874,7 @@ add(ac,av)
fill_ip(&rule.fw_src, &rule.fw_smsk, &ac, &av);
if (ac && isdigit(**av)) {
if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {
u_short nports = 0;
if (fill_port(&nports, rule.fw_pts, 0, *av))
@ -866,7 +897,7 @@ add(ac,av)
fill_ip(&rule.fw_dst, &rule.fw_dmsk, &ac, &av);
if (ac && isdigit(**av)) {
if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {
u_short nports = 0;
if (fill_port(&nports,