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-rw-r--r--iptables/ip6tables-restore.c55
1 files changed, 43 insertions, 12 deletions
diff --git a/iptables/ip6tables-restore.c b/iptables/ip6tables-restore.c
index dc0acb05..8a47f09c 100644
--- a/iptables/ip6tables-restore.c
+++ b/iptables/ip6tables-restore.c
@@ -15,6 +15,7 @@
#include <stdio.h>
#include <stdlib.h>
#include "ip6tables.h"
+#include "xshared.h"
#include "xtables.h"
#include "libiptc/libip6tc.h"
#include "ip6tables-multi.h"
@@ -25,17 +26,23 @@
#define DEBUGP(x, args...)
#endif
-static int counters = 0, verbose = 0, noflush = 0;
+static int counters = 0, verbose = 0, noflush = 0, wait = 0;
+
+static struct timeval wait_interval = {
+ .tv_sec = 1,
+};
/* Keeping track of external matches and targets. */
static const struct option options[] = {
- {.name = "counters", .has_arg = false, .val = 'c'},
- {.name = "verbose", .has_arg = false, .val = 'v'},
- {.name = "test", .has_arg = false, .val = 't'},
- {.name = "help", .has_arg = false, .val = 'h'},
- {.name = "noflush", .has_arg = false, .val = 'n'},
- {.name = "modprobe", .has_arg = true, .val = 'M'},
- {.name = "table", .has_arg = true, .val = 'T'},
+ {.name = "counters", .has_arg = 0, .val = 'c'},
+ {.name = "verbose", .has_arg = 0, .val = 'v'},
+ {.name = "test", .has_arg = 0, .val = 't'},
+ {.name = "help", .has_arg = 0, .val = 'h'},
+ {.name = "noflush", .has_arg = 0, .val = 'n'},
+ {.name = "modprobe", .has_arg = 1, .val = 'M'},
+ {.name = "table", .has_arg = 1, .val = 'T'},
+ {.name = "wait", .has_arg = 2, .val = 'w'},
+ {.name = "wait-interval", .has_arg = 2, .val = 'W'},
{NULL},
};
@@ -43,14 +50,16 @@ static void print_usage(const char *name, const char *version) __attribute__((no
static void print_usage(const char *name, const char *version)
{
- fprintf(stderr, "Usage: %s [-c] [-v] [-t] [-h] [-n] [-T table] [-M command]\n"
+ fprintf(stderr, "Usage: %s [-c] [-v] [-t] [-h] [-n] [-w secs] [-W usecs] [-T table] [-M command]\n"
" [ --counters ]\n"
" [ --verbose ]\n"
" [ --test ]\n"
" [ --help ]\n"
" [ --noflush ]\n"
+ " [ --wait=<seconds>\n"
+ " [ --wait-interval=<usecs>\n"
" [ --table=<TABLE> ]\n"
- " [ --modprobe=<command> ]\n", name);
+ " [ --modprobe=<command> ]\n", name);
exit(1);
}
@@ -181,7 +190,7 @@ int ip6tables_restore_main(int argc, char *argv[])
{
struct xtc_handle *handle = NULL;
char buffer[10240];
- int c;
+ int c, lock;
char curtable[XT_TABLE_MAXNAMELEN + 1];
FILE *in;
int in_table = 0, testing = 0;
@@ -189,6 +198,7 @@ int ip6tables_restore_main(int argc, char *argv[])
const struct xtc_ops *ops = &ip6tc_ops;
line = 0;
+ lock = XT_LOCK_NOT_ACQUIRED;
ip6tables_globals.program_name = "ip6tables-restore";
c = xtables_init_all(&ip6tables_globals, NFPROTO_IPV6);
@@ -203,7 +213,7 @@ int ip6tables_restore_main(int argc, char *argv[])
init_extensions6();
#endif
- while ((c = getopt_long(argc, argv, "bcvthnM:T:", options, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "bcvthnwWM:T:", options, NULL)) != -1) {
switch (c) {
case 'b':
fprintf(stderr, "-b/--binary option is not implemented\n");
@@ -224,6 +234,12 @@ int ip6tables_restore_main(int argc, char *argv[])
case 'n':
noflush = 1;
break;
+ case 'w':
+ wait = parse_wait_time(argc, argv);
+ break;
+ case 'W':
+ parse_wait_interval(argc, argv, &wait_interval);
+ break;
case 'M':
xtables_modprobe_program = optarg;
break;
@@ -268,8 +284,23 @@ int ip6tables_restore_main(int argc, char *argv[])
DEBUGP("Not calling commit, testing\n");
ret = 1;
}
+
+ /* Done with the current table, release the lock. */
+ if (lock >= 0) {
+ xtables_unlock(lock);
+ lock = XT_LOCK_NOT_ACQUIRED;
+ }
+
in_table = 0;
} else if ((buffer[0] == '*') && (!in_table)) {
+ /* Acquire a lock before we create a new table handle */
+ lock = xtables_lock(wait, &wait_interval);
+ if (lock == XT_LOCK_BUSY) {
+ fprintf(stderr, "Another app is currently holding the xtables lock. "
+ "Perhaps you want to use the -w option?\n");
+ exit(RESOURCE_PROBLEM);
+ }
+
/* New table */
char *table;