[iproute2-next 1/2] tipc: add option to set master key for encryption

[Tuong Lien <tuong.t.lien@dektech.com.au>]

In addition to the support of master key in kernel, we add the 'master'
option to the 'tipc node set key' command for user to be able to
specify a key as master key during the key setting. This is carried out
by turning on the new netlink flag - 'TIPC_NLA_NODE_KEY_MASTER'.
For example:

$ tipc node set key "this_is_a_master_key" master

The command's help menu is also updated to give a better description of
all the available options.

Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
---
 tipc/node.c | 46 +++++++++++++++++++++++++++++-----------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/tipc/node.c b/tipc/node.c
index ffdaeaea..1ff0baa4 100644
--- a/tipc/node.c
+++ b/tipc/node.c
@@ -160,19 +160,21 @@ static int cmd_node_set_nodeid(struct nlmsghdr *nlh, const struct cmd *cmd,
 static void cmd_node_set_key_help(struct cmdl *cmdl)
 {
 	fprintf(stderr,
-		"Usage: %s node set key KEY [algname ALGNAME] [nodeid NODEID]\n\n"
+		"Usage: %s node set key KEY [algname ALGNAME] [PROPERTIES]\n\n"
+		"KEY\n"
+		"  Symmetric KEY & SALT as a composite ASCII or hex string (0x...) in form:\n"
+		"  [KEY: 16, 24 or 32 octets][SALT: 4 octets]\n\n"
+		"ALGNAME\n"
+		"  Cipher algorithm [default: \"gcm(aes)\"]\n\n"
 		"PROPERTIES\n"
-		" KEY                   - Symmetric KEY & SALT as a normal or hex string\n"
-		"                         that consists of two parts:\n"
-		"                         [KEY: 16, 24 or 32 octets][SALT: 4 octets]\n\n"
-		" algname ALGNAME       - Default: \"gcm(aes)\"\n\n"
-		" nodeid NODEID         - Own or peer node identity to which the key will\n"
-		"                         be attached. If not present, the key is a cluster\n"
-		"                         key!\n\n"
+		"  master                - Set KEY as a cluster master key\n"
+		"  <empty>               - Set KEY as a cluster key\n"
+		"  nodeid NODEID         - Set KEY as a per-node key for own or peer\n\n"
 		"EXAMPLES\n"
-		"  %s node set key this_is_a_key16_salt algname \"gcm(aes)\" nodeid node1\n"
-		"  %s node set key 0x746869735F69735F615F6B657931365F73616C74 nodeid node2\n\n",
-		cmdl->argv[0], cmdl->argv[0], cmdl->argv[0]);
+		"  %s node set key this_is_a_master_key master\n"
+		"  %s node set key 0x746869735F69735F615F6B657931365F73616C74\n"
+		"  %s node set key this_is_a_key16_salt algname \"gcm(aes)\" nodeid 1001002\n\n",
+		cmdl->argv[0], cmdl->argv[0], cmdl->argv[0], cmdl->argv[0]);
 }
 
 static int cmd_node_set_key(struct nlmsghdr *nlh, const struct cmd *cmd,
@@ -187,24 +189,21 @@ static int cmd_node_set_key(struct nlmsghdr *nlh, const struct cmd *cmd,
 	struct opt opts[] = {
 		{ "algname",	OPT_KEYVAL,	NULL },
 		{ "nodeid",	OPT_KEYVAL,	NULL },
+		{ "master",	OPT_KEY,	NULL },
 		{ NULL }
 	};
 	struct nlattr *nest;
-	struct opt *opt_algname, *opt_nodeid;
+	struct opt *opt_algname, *opt_nodeid, *opt_master;
 	char buf[MNL_SOCKET_BUFFER_SIZE];
 	uint8_t id[TIPC_NODEID_LEN] = {0,};
 	int keysize;
 	char *str;
 
-	if (help_flag) {
+	if (help_flag || cmdl->optind >= cmdl->argc) {
 		(cmd->help)(cmdl);
 		return -EINVAL;
 	}
 
-	if (cmdl->optind >= cmdl->argc) {
-		fprintf(stderr, "error, missing key\n");
-		return -EINVAL;
-	}
 
 	/* Get user key */
 	str = shift_cmdl(cmdl);
@@ -230,17 +229,30 @@ static int cmd_node_set_key(struct nlmsghdr *nlh, const struct cmd *cmd,
 		return -EINVAL;
 	}
 
+	/* Get master key indication */
+	opt_master = get_opt(opts, "master");
+
+	/* Sanity check if wrong option */
+	if (opt_nodeid && opt_master) {
+		fprintf(stderr, "error, per-node key cannot be master\n");
+		return -EINVAL;
+	}
+
 	/* Init & do the command */
 	nlh = msg_init(buf, TIPC_NL_KEY_SET);
 	if (!nlh) {
 		fprintf(stderr, "error, message initialisation failed\n");
 		return -1;
 	}
+
 	nest = mnl_attr_nest_start(nlh, TIPC_NLA_NODE);
 	keysize = tipc_aead_key_size(&input.key);
 	mnl_attr_put(nlh, TIPC_NLA_NODE_KEY, keysize, &input.key);
 	if (opt_nodeid)
 		mnl_attr_put(nlh, TIPC_NLA_NODE_ID, TIPC_NODEID_LEN, id);
+	if (opt_master)
+		mnl_attr_put(nlh, TIPC_NLA_NODE_KEY_MASTER, 0, NULL);
+
 	mnl_attr_nest_end(nlh, nest);
 	return msg_doit(nlh, NULL, NULL);
 }
-- 
2.26.2