add option --reconnect-timeout

Users could specify large reconnect-timeout to
survive unstable network connections.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

main.c

@@ -74,6 +74,7 @@ static struct option long_options[] = {
 	{"cookie-on-stdin", 0, 0, '4'},
 	{"passwd-on-stdin", 0, 0, '5'},
 	{"no-passwd", 0, 0, '6'},
+	{"reconnect-timeout", 1, 0, '7'},
 	{NULL, 0, 0, 0},
 };
 
@@ -108,6 +109,7 @@ void usage(void)
 	printf("      --no-dtls                   Disable DTLS\n");
 	printf("      --no-passwd                 Disable password/SecurID authentication\n");
 	printf("      --passwd-on-stdin           Read password from standard input\n");
+	printf("      --reconnect-timeout         Connection retry timeout in seconds\n");
 	exit(1);
 }
 
@@ -198,6 +200,9 @@ int main(int argc, char **argv)
 		case '6':
 			vpninfo->nopasswd = 1;
 			break;
+		case '7':
+			vpninfo->reconnect_timeout = atoi(optarg);
+			break;
 		case 'C':
 			vpninfo->cookie = optarg;
 			break;

openconnect.8

@@ -99,6 +99,9 @@ openconnect \- Connect to Cisco AnyConnect VPN
 [
 .B --passwd-on-stdin
 ]
+[
+.B --reconnect-timeout
+]
 \fIserver\fR
 
 .SH DESCRIPTION
@@ -218,6 +221,11 @@ Never attempt password (or SecurID) authentication
 .TP
 .B --passwd-on-stdin
 Read password from standard input
+.TP
+.B --reconnect-timeout
+Keep reconnect attempts until so much seconds are elapsed. The default
+timeout is 300 seconds, which means that openconnect can recover
+VPN connection after a temporary network down time of 300 seconds.
 
 .SH LIMITATIONS
 The