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-rw-r--r--src/connman.h16
-rw-r--r--src/iptables.c511
2 files changed, 527 insertions, 0 deletions
diff --git a/src/connman.h b/src/connman.h
index 95e5c8a3..96c3ed66 100644
--- a/src/connman.h
+++ b/src/connman.h
@@ -778,6 +778,22 @@ int __connman_stats_get(struct connman_service *service,
connman_bool_t roaming,
struct connman_stats_data *data);
+int __connman_iptables_new_chain(const char *table_name,
+ const char *chain);
+int __connman_iptables_delete_chain(const char *table_name,
+ const char *chain);
+int __connman_iptables_flush_chain(const char *table_name,
+ const char *chain);
+int __connman_iptables_change_policy(const char *table_name,
+ const char *chain,
+ const char *policy);
+int __connman_iptables_append(const char *table_name,
+ const char *chain,
+ const char *rule_spec);
+int __connman_iptables_delete(const char *table_name,
+ const char *chain,
+ const char *rule_spec);
+
int __connman_iptables_init(void);
void __connman_iptables_cleanup(void);
int __connman_iptables_command(const char *format, ...)
diff --git a/src/iptables.c b/src/iptables.c
index d435519f..0e1eefb7 100644
--- a/src/iptables.c
+++ b/src/iptables.c
@@ -2085,6 +2085,517 @@ int __connman_iptables_command(const char *format, ...)
return ret;
}
+struct parse_context {
+ int argc;
+ char **argv;
+ struct ipt_ip *ip;
+ struct xtables_target *xt_t;
+ struct xtables_match *xt_m;
+ struct xtables_rule_match *xt_rm;
+};
+
+static int prepare_getopt_args(const char *str, struct parse_context *ctx)
+{
+ char **tokens;
+ int i;
+
+ tokens = g_strsplit_set(str, " ", -1);
+
+ for (i = 0; tokens[i]; i++);
+
+ /* Add space for the argv[0] value */
+ ctx->argc = i + 1;
+
+ /* Don't forget the last NULL entry */
+ ctx->argv = g_try_malloc0((ctx->argc + 1) * sizeof(char *));
+ if (ctx->argv == NULL) {
+ g_strfreev(tokens);
+ return -ENOMEM;
+ }
+
+ /*
+ * getopt_long() jumps over the first token; we need to add some
+ * random argv[0] entry.
+ */
+ ctx->argv[0] = g_strdup("argh");
+ for (i = 1; i < ctx->argc; i++)
+ ctx->argv[i] = tokens[i - 1];
+
+ return 0;
+}
+
+#if XTABLES_VERSION_CODE > 5
+
+static int parse_xt_modules(int c, connman_bool_t invert,
+ struct parse_context *ctx)
+{
+ struct xtables_match *m;
+ struct xtables_rule_match *rm;
+
+ DBG("xtables version code > 5");
+
+ for (rm = ctx->xt_rm; rm != NULL; rm = rm->next) {
+ if (rm->completed != 0)
+ continue;
+
+ m = rm->match;
+
+ if (m->x6_parse == NULL && m->parse == NULL)
+ continue;
+
+ if (c < (int) m->option_offset ||
+ c >= (int) m->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ continue;
+
+ xtables_option_mpcall(c, ctx->argv, invert, m, NULL);
+ }
+
+ if (ctx->xt_t == NULL)
+ return 0;
+
+ if (ctx->xt_t->x6_parse == NULL && ctx->xt_t->parse == NULL)
+ return 0;
+
+ if (c < (int) ctx->xt_t->option_offset ||
+ c >= (int) ctx->xt_t->option_offset
+ + XT_OPTION_OFFSET_SCALE)
+ return 0;
+
+ xtables_option_tpcall(c, ctx->argv, invert, ctx->xt_t, NULL);
+
+ return 0;
+}
+
+static int final_check_xt_modules(struct parse_context *ctx)
+{
+ struct xtables_rule_match *rm;
+
+ DBG("xtables version code > 5");
+
+ for (rm = ctx->xt_rm; rm != NULL; rm = rm->next)
+ xtables_option_mfcall(rm->match);
+
+ if (ctx->xt_t != NULL)
+ xtables_option_tfcall(ctx->xt_t);
+
+ return 0;
+}
+
+#else
+
+static int parse_xt_modules(int c, connman_bool_t invert,
+ struct parse_context *ctx)
+{
+ struct xtables_match *m;
+ struct xtables_rule_match *rm;
+ int err;
+
+ DBG("xtables version code <= 5");
+
+ for (rm = ctx->xt_rm; rm != NULL; rm = rm->next) {
+ if (rm->completed == 1)
+ continue;
+
+ m = rm->match;
+
+ if (m->parse == NULL)
+ continue;
+
+ err = m->parse(c - m->option_offset,
+ argv, invert, &m->mflags,
+ NULL, &m->m);
+ if (err > 0)
+ return -err;
+ }
+
+ if (ctx->xt_t == NULL)
+ return 0;
+
+ if (ctx->xt_t->parse == NULL)
+ return 0;
+
+ err = ctx->xt_m->parse(c - ctx->xt_m->option_offset,
+ ctx->argv, invert, &ctx->xt_m->mflags,
+ NULL, &ctx->xt_m->m);
+ return -err;
+}
+
+static int final_check_xt_modules(struct parse_context *ctx)
+{
+ struct xtables_rule_match *rm;
+
+ DBG("xtables version code <= 5");
+
+ for (rm = ctx->xt_rm; rm != NULL; rm = rm->next)
+ if (rm->match->final_check != NULL)
+ rm->match->final_check(rm->match->mflags);
+
+ if (ctx->xt_t != NULL && ctx->xt_t->final_check != NULL)
+ ctx->xt_t->final_check(ctx->xt_t->tflags);
+
+ return 0;
+}
+
+#endif
+
+static int parse_rule_spec(struct connman_iptables *table,
+ struct parse_context *ctx)
+{
+ /*
+ * How the parser works:
+ *
+ * - If getopt finds 's', 'd', 'i', 'o'.
+ * just extract the information.
+ * - if '!' is found, set the invert flag to true and
+ * removes the '!' from the optarg string and jumps
+ * back to getopt to reparse the current optarg string.
+ * After reparsing the invert flag is reseted to false.
+ * - If 'm' or 'j' is found then call either
+ * prepare_matches() or prepare_target(). Those function
+ * will modify (extend) the longopts for getopt_long.
+ * That means getopt will change its matching context according
+ * the loaded target.
+ *
+ * Here an example with iptables-test
+ *
+ * argv[0] = ./tools/iptables-test
+ * argv[1] = -t
+ * argv[2] = filter
+ * argv[3] = -A
+ * argv[4] = INPUT
+ * argv[5] = -m
+ * argv[6] = mark
+ * argv[7] = --mark
+ * argv[8] = 999
+ * argv[9] = -j
+ * argv[10] = LOG
+ *
+ * getopt found 'm' then the optarg is "mark" and optind 7
+ * The longopts array containts before hitting the `case 'm'`
+ *
+ * val A has_arg 1 name append
+ * val C has_arg 1 name compare
+ * val D has_arg 1 name delete
+ * val F has_arg 1 name flush-chain
+ * val I has_arg 1 name insert
+ * val L has_arg 2 name list
+ * val N has_arg 1 name new-chain
+ * val P has_arg 1 name policy
+ * val X has_arg 1 name delete-chain
+ * val d has_arg 1 name destination
+ * val i has_arg 1 name in-interface
+ * val j has_arg 1 name jump
+ * val m has_arg 1 name match
+ * val o has_arg 1 name out-interface
+ * val s has_arg 1 name source
+ * val t has_arg 1 name table
+ *
+ * After executing the `case 'm'` block longopts is
+ *
+ * val A has_arg 1 name append
+ * val C has_arg 1 name compare
+ * val D has_arg 1 name delete
+ * val F has_arg 1 name flush-chain
+ * val I has_arg 1 name insert
+ * val L has_arg 2 name list
+ * val N has_arg 1 name new-chain
+ * val P has_arg 1 name policy
+ * val X has_arg 1 name delete-chain
+ * val d has_arg 1 name destination
+ * val i has_arg 1 name in-interface
+ * val j has_arg 1 name jump
+ * val m has_arg 1 name match
+ * val o has_arg 1 name out-interface
+ * val s has_arg 1 name source
+ * val t has_arg 1 name table
+ * val has_arg 1 name mark
+ *
+ * So the 'mark' matcher has added the 'mark' options
+ * and getopt will then return c '256' optarg "999" optind 9
+ * And we will hit the 'default' statement which then
+ * will call the matchers parser (xt_m->parser() or
+ * xtables_option_mpcall() depending on which version
+ * of libxtables is found.
+ */
+ connman_bool_t invert = FALSE;
+ int len, c, err;
+
+ DBG("");
+
+ ctx->ip = g_try_new0(struct ipt_ip, 1);
+ if (ctx->ip == NULL)
+ return -ENOMEM;
+
+ /*
+ * As side effect parsing a rule sets some global flags
+ * which will be evaluated/verified. Let's reset them
+ * to ensure we can parse more than one rule.
+ */
+ clear_tables_flags();
+
+ /*
+ * Tell getopt_long not to generate error messages for unknown
+ * options and also reset optind back to 0.
+ */
+ opterr = 0;
+ optind = 0;
+
+ while ((c = getopt_long(ctx->argc, ctx->argv,
+ "-:d:i:o:s:m:j:",
+ iptables_globals.opts, NULL)) != -1) {
+ switch (c) {
+ case 's':
+ /* Source specification */
+ if (!parse_ip_and_mask(optarg,
+ &ctx->ip->src,
+ &ctx->ip->smsk))
+ break;
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_SRCIP;
+
+ break;
+ case 'd':
+ /* Destination specification */
+ if (!parse_ip_and_mask(optarg,
+ &ctx->ip->dst,
+ &ctx->ip->dmsk))
+ break;
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_DSTIP;
+ break;
+ case 'i':
+ /* In interface specification */
+ len = strlen(optarg);
+
+ if (len + 1 > IFNAMSIZ)
+ break;
+
+ strcpy(ctx->ip->iniface, optarg);
+ memset(ctx->ip->iniface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_VIA_IN;
+
+ break;
+ case 'o':
+ /* Out interface specification */
+ len = strlen(optarg);
+
+ if (len + 1 > IFNAMSIZ)
+ break;
+
+ strcpy(ctx->ip->outiface, optarg);
+ memset(ctx->ip->outiface_mask, 0xff, len + 1);
+
+ if (invert)
+ ctx->ip->invflags |= IPT_INV_VIA_OUT;
+
+ break;
+ case 'm':
+ /* Matches */
+ ctx->xt_m = prepare_matches(table, &ctx->xt_rm, optarg);
+ if (ctx->xt_m == NULL) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ break;
+ case 'j':
+ /* Target */
+ ctx->xt_t = prepare_target(table, optarg);
+ if (ctx->xt_t == NULL) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ break;
+ case 1:
+ if (optarg[0] == '!' && optarg[1] == '\0') {
+ invert = TRUE;
+
+ /* Remove the '!' from the optarg */
+ optarg[0] = '\0';
+
+ /*
+ * And recall getopt_long without reseting
+ * invert.
+ */
+ continue;
+ }
+
+ break;
+ default:
+ err = parse_xt_modules(c, invert, ctx);
+ if (err == 1)
+ continue;
+
+ break;
+ }
+
+ invert = FALSE;
+ }
+
+ err = final_check_xt_modules(ctx);
+
+out:
+ return err;
+}
+
+static void cleanup_parse_context(struct parse_context *ctx)
+{
+ g_strfreev(ctx->argv);
+ g_free(ctx->ip);
+ if (ctx->xt_t != NULL)
+ g_free(ctx->xt_t->t);
+ if (ctx->xt_m != NULL)
+ g_free(ctx->xt_m->m);
+ g_free(ctx);
+}
+
+int __connman_iptables_new_chain(const char *table_name,
+ const char *chain)
+{
+ struct connman_iptables *table;
+
+ DBG("-t %s -N %s", table_name, chain);
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL)
+ return -EINVAL;
+
+ return iptables_add_chain(table, chain);
+}
+
+int __connman_iptables_delete_chain(const char *table_name,
+ const char *chain)
+{
+ struct connman_iptables *table;
+
+ DBG("-t %s -X %s", table_name, chain);
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL)
+ return -EINVAL;
+
+ return iptables_delete_chain(table, chain);
+}
+
+int __connman_iptables_flush_chain(const char *table_name,
+ const char *chain)
+{
+ struct connman_iptables *table;
+
+ DBG("-t %s -F %s", table_name, chain);
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL)
+ return -EINVAL;
+
+ return iptables_flush_chain(table, chain);
+}
+
+int __connman_iptables_change_policy(const char *table_name,
+ const char *chain,
+ const char *policy)
+{
+ struct connman_iptables *table;
+
+ DBG("-t %s -F %s", table_name, chain);
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL)
+ return -EINVAL;
+
+ return iptables_change_policy(table, chain, policy);
+}
+
+int __connman_iptables_append(const char *table_name,
+ const char *chain,
+ const char *rule_spec)
+{
+ struct connman_iptables *table;
+ struct parse_context *ctx;
+ const char *target_name;
+ int err;
+
+ ctx = g_try_new0(struct parse_context, 1);
+ if (ctx == NULL)
+ return -ENOMEM;
+
+ DBG("-t %s -A %s %s", table_name, chain, rule_spec);
+
+ err = prepare_getopt_args(rule_spec, ctx);
+ if (err < 0)
+ goto out;
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = parse_rule_spec(table, ctx);
+ if (err < 0)
+ goto out;
+
+ if (ctx->xt_t == NULL)
+ target_name = NULL;
+ else
+ target_name = ctx->xt_t->name;
+
+ err = iptables_insert_rule(table, ctx->ip, chain,
+ target_name, ctx->xt_t, ctx->xt_rm);
+out:
+ cleanup_parse_context(ctx);
+
+ return err;
+}
+
+int __connman_iptables_delete(const char *table_name,
+ const char *chain,
+ const char *rule_spec)
+{
+ struct connman_iptables *table;
+ struct parse_context *ctx;
+ const char *target_name;
+ int err;
+
+ ctx = g_try_new0(struct parse_context, 1);
+ if (ctx == NULL)
+ return -ENOMEM;
+
+ DBG("-t %s -D %s %s", table_name, chain, rule_spec);
+
+ err = prepare_getopt_args(rule_spec, ctx);
+ if (err < 0)
+ goto out;
+
+ table = pre_load_table(table_name, NULL);
+ if (table == NULL) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = parse_rule_spec(table, ctx);
+ if (err < 0)
+ goto out;
+
+ if (ctx->xt_t == NULL)
+ target_name = NULL;
+ else
+ target_name = ctx->xt_t->name;
+
+ err = iptables_delete_rule(table, ctx->ip, chain,
+ target_name, ctx->xt_t, ctx->xt_m,
+ ctx->xt_rm);
+out:
+ cleanup_parse_context(ctx);
+
+ return err;
+}
int __connman_iptables_commit(const char *table_name)
{
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-31 11:01:32 +0000