[iptables PATCH v2 01/24] xtables_error() does not return

[Phil Sutter <phil@nwl.cc>]

It's a define which resolves into a callback which in turn is declared
with noreturn attribute. It will never return, therefore drop all
explicit exit() calls or other dead code immediately following it.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 iptables/iptables-restore.c | 18 ++++++------------
 iptables/iptables-xml.c     | 22 +++++++---------------
 iptables/nft.c              |  8 ++------
 iptables/xshared.c          |  1 -
 iptables/xtables-restore.c  | 13 ++++---------
 5 files changed, 19 insertions(+), 43 deletions(-)

diff --git a/iptables/iptables-restore.c b/iptables/iptables-restore.c
index 430be18b3c300..6bc182bfae4a2 100644
--- a/iptables/iptables-restore.c
+++ b/iptables/iptables-restore.c
@@ -82,11 +82,10 @@ create_handle(struct iptables_restore_cb *cb, const char *tablename)
 		handle = cb->ops->init(tablename);
 	}
 
-	if (!handle) {
+	if (!handle)
 		xtables_error(PARAMETER_PROBLEM, "%s: unable to initialize "
 			"table '%s'\n", xt_params->program_name, tablename);
-		exit(1);
-	}
+
 	return handle;
 }
 
@@ -207,12 +206,11 @@ ip46tables_restore_main(struct iptables_restore_cb *cb, int argc, char *argv[])
 
 			table = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, table '%s'\n", line, table);
-			if (!table) {
+			if (!table)
 				xtables_error(PARAMETER_PROBLEM,
 					"%s: line %u table name invalid\n",
 					xt_params->program_name, line);
-				exit(1);
-			}
+
 			strncpy(curtable, table, XT_TABLE_MAXNAMELEN);
 			curtable[XT_TABLE_MAXNAMELEN] = '\0';
 
@@ -248,12 +246,10 @@ ip46tables_restore_main(struct iptables_restore_cb *cb, int argc, char *argv[])
 
 			chain = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, chain '%s'\n", line, chain);
-			if (!chain) {
+			if (!chain)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u chain name invalid\n",
 					   xt_params->program_name, line);
-				exit(1);
-			}
 
 			if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
 				xtables_error(PARAMETER_PROBLEM,
@@ -281,12 +277,10 @@ ip46tables_restore_main(struct iptables_restore_cb *cb, int argc, char *argv[])
 
 			policy = strtok(NULL, " \t\n");
 			DEBUGP("line %u, policy '%s'\n", line, policy);
-			if (!policy) {
+			if (!policy)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u policy invalid\n",
 					   xt_params->program_name, line);
-				exit(1);
-			}
 
 			if (strcmp(policy, "-") != 0) {
 				struct xt_counters count = {};
diff --git a/iptables/iptables-xml.c b/iptables/iptables-xml.c
index 9d9ce6d4a13ee..36ad78450b1ef 100644
--- a/iptables/iptables-xml.c
+++ b/iptables/iptables-xml.c
@@ -208,12 +208,11 @@ needChain(char *chain)
 static void
 saveChain(char *chain, char *policy, struct xt_counters *ctr)
 {
-	if (nextChain >= maxChains) {
+	if (nextChain >= maxChains)
 		xtables_error(PARAMETER_PROBLEM,
 			   "%s: line %u chain name invalid\n",
 			   prog_name, line);
-		exit(1);
-	};
+
 	chains[nextChain].chain = strdup(chain);
 	chains[nextChain].policy = strdup(policy);
 	chains[nextChain].count = *ctr;
@@ -606,12 +605,11 @@ iptables_xml_main(int argc, char *argv[])
 
 			table = strtok(buffer + 1, " \t\n");
 			DEBUGP("line %u, table '%s'\n", line, table);
-			if (!table) {
+			if (!table)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u table name invalid\n",
 					   prog_name, line);
-				exit(1);
-			}
+
 			openTable(table);
 
 			ret = 1;
@@ -623,23 +621,19 @@ iptables_xml_main(int argc, char *argv[])
 
 			chain = strtok(buffer + 1, " \t\n");
 			DEBUGP("line %u, chain '%s'\n", line, chain);
-			if (!chain) {
+			if (!chain)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u chain name invalid\n",
 					   prog_name, line);
-				exit(1);
-			}
 
 			DEBUGP("Creating new chain '%s'\n", chain);
 
 			policy = strtok(NULL, " \t\n");
 			DEBUGP("line %u, policy '%s'\n", line, policy);
-			if (!policy) {
+			if (!policy)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u policy invalid\n",
 					   prog_name, line);
-				exit(1);
-			}
 
 			ctrs = strtok(NULL, " \t\n");
 			parse_counters(ctrs, &count);
@@ -735,13 +729,11 @@ iptables_xml_main(int argc, char *argv[])
 					     param_buffer[1] != '-' &&
 					     strchr(param_buffer, 't')) ||
 					    (!strncmp(param_buffer, "--t", 3) &&
-					     !strncmp(param_buffer, "--table", strlen(param_buffer)))) {
+					     !strncmp(param_buffer, "--table", strlen(param_buffer))))
 						xtables_error(PARAMETER_PROBLEM,
 							   "Line %u seems to have a "
 							   "-t table option.\n",
 							   line);
-						exit(1);
-					}
 
 					add_argv(param_buffer, quoted);
 					if (newargc >= 2
diff --git a/iptables/nft.c b/iptables/nft.c
index 8047a51f00493..90bb0c63c025a 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -2517,10 +2517,8 @@ int nft_rule_list(struct nft_handle *h, const char *chain, const char *table,
 
 	ops = nft_family_ops_lookup(h->family);
 
-	if (!nft_is_table_compatible(h, table)) {
+	if (!nft_is_table_compatible(h, table))
 		xtables_error(OTHER_PROBLEM, "table `%s' is incompatible, use 'nft' tool.\n", table);
-		return 0;
-	}
 
 	list = nft_chain_list_get(h, table);
 	if (!list)
@@ -2620,10 +2618,8 @@ int nft_rule_list_save(struct nft_handle *h, const char *chain,
 
 	nft_xt_builtin_init(h, table);
 
-	if (!nft_is_table_compatible(h, table)) {
+	if (!nft_is_table_compatible(h, table))
 		xtables_error(OTHER_PROBLEM, "table `%s' is incompatible, use 'nft' tool.\n", table);
-		return 0;
-	}
 
 	list = nft_chain_list_get(h, table);
 	if (!list)
diff --git a/iptables/xshared.c b/iptables/xshared.c
index 36a2ec5f193d3..5e6cd4ae7c908 100644
--- a/iptables/xshared.c
+++ b/iptables/xshared.c
@@ -181,7 +181,6 @@ int command_default(struct iptables_command_state *cs,
 		xtables_error(PARAMETER_PROBLEM, "unknown option "
 			      "\"%s\"", cs->argv[optind-1]);
 	xtables_error(PARAMETER_PROBLEM, "Unknown arg \"%s\"", optarg);
-	return 0;
 }
 
 static mainfunc_t subcmd_get(const char *cmd, const struct subcommand *cb)
diff --git a/iptables/xtables-restore.c b/iptables/xtables-restore.c
index f930f5ba2d167..27e65b971727e 100644
--- a/iptables/xtables-restore.c
+++ b/iptables/xtables-restore.c
@@ -131,12 +131,11 @@ void xtables_restore_parse(struct nft_handle *h,
 
 			table = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, table '%s'\n", line, table);
-			if (!table) {
+			if (!table)
 				xtables_error(PARAMETER_PROBLEM,
 					"%s: line %u table name invalid\n",
 					xt_params->program_name, line);
-				exit(1);
-			}
+
 			curtable = nft_table_builtin_find(h, table);
 			if (!curtable)
 				xtables_error(PARAMETER_PROBLEM,
@@ -168,12 +167,10 @@ void xtables_restore_parse(struct nft_handle *h,
 
 			chain = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, chain '%s'\n", line, chain);
-			if (!chain) {
+			if (!chain)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u chain name invalid\n",
 					   xt_params->program_name, line);
-				exit(1);
-			}
 
 			if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
 				xtables_error(PARAMETER_PROBLEM,
@@ -183,12 +180,10 @@ void xtables_restore_parse(struct nft_handle *h,
 
 			policy = strtok(NULL, " \t\n");
 			DEBUGP("line %u, policy '%s'\n", line, policy);
-			if (!policy) {
+			if (!policy)
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u policy invalid\n",
 					   xt_params->program_name, line);
-				exit(1);
-			}
 
 			if (nft_chain_builtin_find(curtable, chain)) {
 				if (counters) {
-- 
2.23.0