Both iptables.c and ip6tables.c check for target->save == NULL, which
can be consolidated. In fact, we should also check for match->save ==
NULL, which this patch addds to libxtables.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxx>
---
extensions/libxt_standard.c | 14 ++++++++++++++
iptables/ip6tables.c | 12 ------------
iptables/iptables.c | 12 ------------
libxtables/xtables.c | 21 +++++++++++++++++++++
4 files changed, 35 insertions(+), 24 deletions(-)
diff --git a/extensions/libxt_standard.c b/extensions/libxt_standard.c
index c64ba29..601e709 100644
--- a/extensions/libxt_standard.c
+++ b/extensions/libxt_standard.c
@@ -9,12 +9,26 @@ static void standard_help(void)
"(If target is DROP, ACCEPT, RETURN or nothing)\n");
}
+static void standard_save(const void *ip, const struct xt_entry_target *t)
+{
+ /*
+ * This function left blank intentionally - it only serves to make
+ * iptables not exit with "target lacks a save function". The
+ * "standard" target is special, since we do not emit -j standard, but
+ * -j <verdict>. This is printed by iptables.c's function
+ * print_rule4(), which ultimately calls TC_GET_TARGET in
+ * libiptc/libiptc.c that will emit the verdict name based upon data in
+ * the parameter block (@t->data in this "standard_save" function).
+ */
+}
+
static struct xtables_target standard_target = {
.family = NFPROTO_UNSPEC,
.name = "standard",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(int)),
.userspacesize = XT_ALIGN(sizeof(int)),
+ .save = standard_save,
.help = standard_help,
};
diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index 556647f..371d700 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -1112,18 +1112,6 @@ void print_rule6(const struct ip6t_entry *e,
if (target->save)
target->save(&e->ipv6, t);
- else {
- /* If the target size is greater than xt_entry_target
- * there is something to be saved, we just don't know
- * how to print it */
- if (t->u.target_size !=
- sizeof(struct xt_entry_target)) {
- fprintf(stderr, "Target `%s' is missing "
- "save function\n",
- t->u.user.name);
- exit(1);
- }
- }
}
printf("\n");
}
diff --git a/iptables/iptables.c b/iptables/iptables.c
index 00e3f01..6e5250e 100644
--- a/iptables/iptables.c
+++ b/iptables/iptables.c
@@ -1103,18 +1103,6 @@ void print_rule4(const struct ipt_entry *e,
if (target->save)
target->save(&e->ip, t);
- else {
- /* If the target size is greater than xt_entry_target
- * there is something to be saved, we just don't know
- * how to print it */
- if (t->u.target_size !=
- sizeof(struct xt_entry_target)) {
- fprintf(stderr, "Target `%s' is missing "
- "save function\n",
- t->u.user.name);
- exit(1);
- }
- }
}
printf("\n");
}
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index 009ab91..b81013a 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -852,6 +852,16 @@ void xtables_register_match(struct xtables_match *me)
xtables_option_metavalidate(me->name, me->x6_options);
if (me->extra_opts != NULL)
xtables_check_options(me->name, me->extra_opts);
+ if (me->userspacesize > 0 && me->save == NULL &&
+ me->real_name == NULL) {
+ /*
+ * Catch extensions that have data to be saved, but which
+ * forgot to define a save method.
+ */
+ fprintf(stderr, "Match \"%s\" is missing a save function\n",
+ me->name);
+ exit(1);
+ }
/* ignore not interested match */
if (me->family != afinfo->family && me->family != AF_UNSPEC)
@@ -1010,6 +1020,17 @@ void xtables_register_target(struct xtables_target *me)
xtables_option_metavalidate(me->name, me->x6_options);
if (me->extra_opts != NULL)
xtables_check_options(me->name, me->extra_opts);
+ if (me->userspacesize > 0 && me->save == NULL &&
+ me->real_name == NULL) {
+ /*
+ * Catch extensions that have data to be saved, but which
+ * forgot to define a save method. This only applies to true
+ * modules (real_name==NULL), not aliases.
+ */
+ fprintf(stderr, "Target \"%s\" is missing a save function\n",
+ me->name);
+ exit(1);
+ }
/* ignore not interested target */
if (me->family != afinfo->family && me->family != AF_UNSPEC)
--
1.7.10.4
--
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