udhcpd: add -f "foreground" and -S "syslog" options

udhcpc: add -S "syslog" options
remove CONFIG_FEATURE_UDHCP_SYSLOG

function                                             old     new   delta
udhcpd_main                                         1168    1201     +33
udhcpc_main                                         2414    2425     +11
static.udhcpc_longopts                               191     200      +9
qgravechar                                           112     108      -4
packed_usage                                       22843   22827     -16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/2 up/down: 53/-20)             Total: 33 bytes

3 files changed, 8 insertions, 16 deletions

diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index 7a3eda9..76b0780 100644
--- a/networking/udhcp/Config.in
+++ b/networking/udhcp/Config.in
@@ -54,17 +54,6 @@ config APP_UDHCPC
 
 	  See http://udhcp.busybox.net for further details.
 
-config FEATURE_UDHCP_SYSLOG
-	bool "Log udhcp messages to syslog"
-	default n
-	depends on APP_UDHCPD || APP_UDHCPC
-	select FEATURE_SYSLOG
-	help
-	  If not daemonized, udhcpd prints its messages to stdout/stderr.
-	  If this option is selected, it will also log them to syslog.
-
-	  See http://udhcp.busybox.net for further details.
-
 config FEATURE_UDHCP_DEBUG
 	bool "Compile udhcp with noisy debugging messages"
 	default n
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 0e89c3c..7cb1dfe 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -178,6 +178,7 @@ int udhcpc_main(int argc, char **argv)
 		OPT_T = 1 << 15,
 		OPT_t = 1 << 16,
 		OPT_v = 1 << 17,
+		OPT_S = 1 << 18,
 	};
 #if ENABLE_GETOPT_LONG
 	static const char udhcpc_longopts[] ALIGN1 =
@@ -199,6 +200,7 @@ int udhcpc_main(int argc, char **argv)
 		"timeout\0"       Required_argument "T"
 		"version\0"       No_argument       "v"
 		"retries\0"       Required_argument "t"
+		"syslog\0"        No_argument       "S"
 		;
 #endif
 	/* Default options. */
@@ -213,7 +215,7 @@ int udhcpc_main(int argc, char **argv)
 #if ENABLE_GETOPT_LONG
 	applet_long_options = udhcpc_longopts;
 #endif
-	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
+	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vS",
 		&str_c, &str_V, &str_h, &str_h, &str_F,
 		&client_config.interface, &client_config.pidfile, &str_r,
 		&client_config.script, &str_T, &str_t
@@ -262,7 +264,7 @@ int udhcpc_main(int argc, char **argv)
 		return 0;
 	}
 
-	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
+	if (opt & OPT_S) {
 		openlog(applet_name, LOG_PID, LOG_LOCAL0);
 		logmode |= LOGMODE_SYSLOG;
 	}
diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index 89f57bf..d8e80e3 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -32,17 +32,18 @@ int udhcpd_main(int argc, char **argv)
 	uint32_t server_id_align, requested_align, static_lease_ip;
 	unsigned timeout_end;
 	unsigned num_ips;
+	unsigned opt;
 	struct option_set *option;
 	struct dhcpOfferedAddr *lease, static_lease;
 
-//Huh, dhcpd don't have --foreground, --syslog options?? TODO
+	opt = getopt32(argc, argv, "fS");
 
-	if (!ENABLE_FEATURE_UDHCP_DEBUG) {
+	if (!(opt & 1)) { /* no -f */
 		bb_daemonize_or_rexec(0, argv);
 		logmode &= ~LOGMODE_STDIO;
 	}
 
-	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
+	if (opt & 2) { /* -S */
 		openlog(applet_name, LOG_PID, LOG_LOCAL0);
 		logmode |= LOGMODE_SYSLOG;
 	}