xshared: Merge and share parse_chain()

Have a common routine to perform chain name checks, combining all
variants' requirements.

Signed-off-by: Phil Sutter <phil@nwl.cc>

5 files changed, 26 insertions, 59 deletions

diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index e967c040..ec0ae759 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -234,32 +234,6 @@ static int is_exthdr(uint16_t proto)
 }
 
 static void
-parse_chain(const char *chainname)
-{
-	const char *ptr;
-
-	if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN)
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name `%s' too long (must be under %u chars)",
-			   chainname, XT_EXTENSION_MAXNAMELEN);
-
-	if (*chainname == '-' || *chainname == '!')
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name not allowed to start "
-			   "with `%c'\n", *chainname);
-
-	if (xtables_find_target(chainname, XTF_TRY_LOAD))
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name may not clash "
-			   "with target name\n");
-
-	for (ptr = chainname; *ptr; ptr++)
-		if (isspace(*ptr))
-			xtables_error(PARAMETER_PROBLEM,
-				   "Invalid chain name `%s'", chainname);
-}
-
-static void
 print_header(unsigned int format, const char *chain, struct xtc_handle *handle)
 {
 	struct xt_counters counters;
diff --git a/iptables/iptables.c b/iptables/iptables.c
index b925f089..246526a5 100644
--- a/iptables/iptables.c
+++ b/iptables/iptables.c
@@ -223,31 +223,6 @@ iptables_exit_error(enum xtables_exittype status, const char *msg, ...)
 
 /* Christophe Burki wants `-p 6' to imply `-m tcp'.  */
 
-static void
-parse_chain(const char *chainname)
-{
-	const char *ptr;
-
-	if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN)
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name `%s' too long (must be under %u chars)",
-			   chainname, XT_EXTENSION_MAXNAMELEN);
-
-	if (*chainname == '-' || *chainname == '!')
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name not allowed to start "
-			   "with `%c'\n", *chainname);
-
-	if (xtables_find_target(chainname, XTF_TRY_LOAD))
-		xtables_error(PARAMETER_PROBLEM,
-			   "chain name may not clash "
-			   "with target name\n");
-
-	for (ptr = chainname; *ptr; ptr++)
-		if (isspace(*ptr))
-			xtables_error(PARAMETER_PROBLEM,
-				   "Invalid chain name `%s'", chainname);
-}
 
 static void
 print_header(unsigned int format, const char *chain, struct xtc_handle *handle)
diff --git a/iptables/xshared.c b/iptables/xshared.c
index 2d3ef679..bd545d6b 100644
--- a/iptables/xshared.c
+++ b/iptables/xshared.c
@@ -892,3 +892,27 @@ set_option(unsigned int *options, unsigned int option, u_int16_t *invflg,
 		*invflg |= inverse_for_options[i];
 	}
 }
+
+void parse_chain(const char *chainname)
+{
+	const char *ptr;
+
+	if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN)
+		xtables_error(PARAMETER_PROBLEM,
+			      "chain name `%s' too long (must be under %u chars)",
+			      chainname, XT_EXTENSION_MAXNAMELEN);
+
+	if (*chainname == '-' || *chainname == '!')
+		xtables_error(PARAMETER_PROBLEM,
+			      "chain name not allowed to start with `%c'\n",
+			      *chainname);
+
+	if (xtables_find_target(chainname, XTF_TRY_LOAD))
+		xtables_error(PARAMETER_PROBLEM,
+			      "chain name may not clash with target name\n");
+
+	for (ptr = chainname; *ptr; ptr++)
+		if (isspace(*ptr))
+			xtables_error(PARAMETER_PROBLEM,
+				      "Invalid chain name `%s'", chainname);
+}
diff --git a/iptables/xshared.h b/iptables/xshared.h
index b59116ac..6d6acbca 100644
--- a/iptables/xshared.h
+++ b/iptables/xshared.h
@@ -235,6 +235,7 @@ char cmd2char(int option);
 void add_command(unsigned int *cmd, const int newcmd,
 		 const int othercmds, int invert);
 int parse_rulenumber(const char *rule);
+void parse_chain(const char *chainname);
 
 void generic_opt_check(int command, int options);
 char opt2char(int option);
diff --git a/iptables/xtables.c b/iptables/xtables.c
index 5c69af7e..32b93d2b 100644
--- a/iptables/xtables.c
+++ b/iptables/xtables.c
@@ -424,14 +424,7 @@ void do_parse(struct nft_handle *h, int argc, char *argv[],
 			break;
 
 		case 'N':
-			if (optarg && (*optarg == '-' || *optarg == '!'))
-				xtables_error(PARAMETER_PROBLEM,
-					   "chain name not allowed to start "
-					   "with `%c'\n", *optarg);
-			if (xtables_find_target(optarg, XTF_TRY_LOAD))
-				xtables_error(PARAMETER_PROBLEM,
-					   "chain name may not clash "
-					   "with target name\n");
+			parse_chain(optarg);
 			add_command(&p->command, CMD_NEW_CHAIN, CMD_NONE,
 				    invert);
 			p->chain = optarg;