From: Jonh Wendell <jonh.wendell@xxxxxxxxxxxxx>
Similar to the --table argument, if a --chain (or -C) argument
is passed, we limit the output to rules of that chain.
Signed-off-by: Jonh Wendell <jonh.wendell@xxxxxxxxxxxxx>
---
iptables/iptables-save.8 | 8 ++++++--
iptables/iptables-save.c | 13 ++++++++++++-
2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/iptables/iptables-save.8 b/iptables/iptables-save.8
index c2e0a94..2f510d0 100644
--- a/iptables/iptables-save.8
+++ b/iptables/iptables-save.8
@@ -1,4 +1,4 @@
-.TH IPTABLES-SAVE 8 "Jan 04, 2001" "" ""
+.TH IPTABLES-SAVE 8 "Feb 25, 2013" "" ""
.\"
.\" Man page written by Harald Welte <laforge@xxxxxxxxxxxx>
.\" It is based on the iptables man page.
@@ -22,7 +22,7 @@
iptables-save \(em dump iptables rules to stdout
.SH SYNOPSIS
\fBiptables\-save\fP [\fB\-M\fP \fImodprobe\fP] [\fB\-c\fP]
-[\fB\-t\fP \fItable\fP]
+[\fB\-t\fP \fItable\fP] [\fB\-C\fP \fIchain\fP]
.SH DESCRIPTION
.PP
.B iptables-save
@@ -39,6 +39,10 @@ include the current values of all packet and byte counters in the output
\fB\-t\fR, \fB\-\-table\fR \fItablename\fP
restrict output to only one table. If not specified, output includes all
available tables.
+.TP
+\fB\-C\fR, \fB\-\-chain\fR \fIchainname\fP
+restrict output to only one chain. If not specified, output includes all
+available chains.
.SH BUGS
None known as of iptables-1.2.1 release
.SH AUTHOR
diff --git a/iptables/iptables-save.c b/iptables/iptables-save.c
index e599fce..aae77b6 100644
--- a/iptables/iptables-save.c
+++ b/iptables/iptables-save.c
@@ -22,12 +22,14 @@
#endif
static int show_counters = 0;
+static char *chainname = NULL;
static const struct option options[] = {
{.name = "counters", .has_arg = false, .val = 'c'},
{.name = "dump", .has_arg = false, .val = 'd'},
{.name = "table", .has_arg = true, .val = 't'},
{.name = "modprobe", .has_arg = true, .val = 'M'},
+ {.name = "chain", .has_arg = true, .val = 'C'},
{NULL},
};
@@ -85,6 +87,9 @@ static int do_output(const char *tablename)
chain;
chain = iptc_next_chain(h)) {
+ if (chainname && *chainname && strcmp(chain, chainname))
+ continue;
+
printf(":%s ", chain);
if (iptc_builtin(chain, h)) {
struct xt_counters count;
@@ -101,6 +106,9 @@ static int do_output(const char *tablename)
chain = iptc_next_chain(h)) {
const struct ipt_entry *e;
+ if (chainname && *chainname && strcmp(chain, chainname))
+ continue;
+
/* Dump out rules */
e = iptc_first_rule(chain, h);
while(e) {
@@ -140,7 +148,7 @@ iptables_save_main(int argc, char *argv[])
init_extensions4();
#endif
- while ((c = getopt_long(argc, argv, "bcdt:", options, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "bcdt:C:", options, NULL)) != -1) {
switch (c) {
case 'c':
show_counters = 1;
@@ -153,6 +161,9 @@ iptables_save_main(int argc, char *argv[])
case 'M':
xtables_modprobe_program = optarg;
break;
+ case 'C':
+ chainname = optarg;
+ break;
case 'd':
do_output(tablename);
exit(0);
--
1.7.10.4
--
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