Fixed many compilation problems ("set, but not used" warnings) for

gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]

19 files changed, 257 insertions, 157 deletions

diff --git a/RELNOTES b/RELNOTES
index e0e7d604..9f52e7b3 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -94,6 +94,9 @@ work on other platforms. Please report any problems and suggested fixes to
   checking programs to eliminate false positives.
   [ISC-Bugs 27539]
 
+- Fixed many compilation problems ("set, but not used" warnings) for
+  gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
+
 			Changes since 4.2.2
 
 - Fix the code that checks for an existing DDNS transaction to cancel
diff --git a/client/clparse.c b/client/clparse.c
index 9de4ce26..c535d7b4 100644
--- a/client/clparse.c
+++ b/client/clparse.c
@@ -3,7 +3,7 @@
    Parser for dhclient config and lease files... */
 
 /*
- * Copyright (c) 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1996-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -59,10 +59,18 @@ isc_result_t read_client_conf ()
 {
 	struct client_config *config;
 	struct interface_info *ip;
-	struct parse *parse;
 	isc_result_t status;
 	unsigned code;
 
+        /* 
+         * TODO: LATER constant is very undescriptive. We should review it and
+         * change it to something more descriptive or even better remove it
+         * completely as it is currently not used.
+         */
+#ifdef LATER
+        struct parse *parse = NULL;
+#endif
+
 	/* Initialize the default request list. */
 	memset(default_requested_options, 0, sizeof(default_requested_options));
 
@@ -159,7 +167,6 @@ isc_result_t read_client_conf ()
 					(struct interface_info *)0,
 					&top_level_config);
 
-	parse = NULL;
 	if (status != ISC_R_SUCCESS) {
 		;
 #ifdef LATER
diff --git a/client/dhclient.c b/client/dhclient.c
index afe896fc..a68e8859 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -1899,11 +1899,14 @@ void send_discover (cpp)
 	      ntohs (sockaddr_broadcast.sin_port), (long)(client -> interval));
 
 	/* Send out a packet. */
-	result = send_packet (client -> interface, (struct packet *)0,
-			      &client -> packet,
-			      client -> packet_length,
-			      inaddr_any, &sockaddr_broadcast,
-			      (struct hardware *)0);
+	result = send_packet(client->interface, NULL, &client->packet,
+			     client->packet_length, inaddr_any,
+                             &sockaddr_broadcast, NULL);
+        if (result < 0) {
+		log_error("%s:%d: Failed to send %d byte long packet over %s "
+			  "interface.", MDL, client->packet_length,
+			  client->interface->name);
+	}
 
 	/*
 	 * If we used 0 microseconds here, and there were other clients on the
@@ -2166,20 +2169,29 @@ void send_request (cpp)
 	      ntohs (destination.sin_port));
 
 	if (destination.sin_addr.s_addr != INADDR_BROADCAST &&
-	    fallback_interface)
-		result = send_packet (fallback_interface,
-				      (struct packet *)0,
-				      &client -> packet,
-				      client -> packet_length,
-				      from, &destination,
-				      (struct hardware *)0);
-	else
+	    fallback_interface) {
+		result = send_packet(fallback_interface, NULL, &client->packet,
+				     client->packet_length, from, &destination,
+				     NULL);
+		if (result < 0) {
+			log_error("%s:%d: Failed to send %d byte long packet "
+				  "over %s interface.", MDL,
+				  client->packet_length,
+				  fallback_interface->name);
+		}
+        }
+	else {
 		/* Send out a packet. */
-		result = send_packet (client -> interface, (struct packet *)0,
-				      &client -> packet,
-				      client -> packet_length,
-				      from, &destination,
-				      (struct hardware *)0);
+		result = send_packet(client->interface, NULL, &client->packet,
+				     client->packet_length, from, &destination,
+				     NULL);
+		if (result < 0) {
+			log_error("%s:%d: Failed to send %d byte long packet"
+				  " over %s interface.", MDL,
+				  client->packet_length,
+				  client->interface->name);
+		}
+        }
 
 	tv.tv_sec = cur_tv.tv_sec + client->interval;
 	tv.tv_usec = ((tv.tv_sec - cur_tv.tv_sec) > 1) ?
@@ -2195,16 +2207,19 @@ void send_decline (cpp)
 	int result;
 
 	log_info ("DHCPDECLINE on %s to %s port %d",
-	      client -> name ? client -> name : client -> interface -> name,
-	      inet_ntoa (sockaddr_broadcast.sin_addr),
-	      ntohs (sockaddr_broadcast.sin_port));
+	      client->name ? client->name : client->interface->name,
+	      inet_ntoa(sockaddr_broadcast.sin_addr),
+	      ntohs(sockaddr_broadcast.sin_port));
 
 	/* Send out a packet. */
-	result = send_packet (client -> interface, (struct packet *)0,
-			      &client -> packet,
-			      client -> packet_length,
-			      inaddr_any, &sockaddr_broadcast,
-			      (struct hardware *)0);
+	result = send_packet(client->interface, NULL, &client->packet,
+			     client->packet_length, inaddr_any,
+			     &sockaddr_broadcast, NULL);
+	if (result < 0) {
+		log_error("%s:%d: Failed to send %d byte long packet over %s"
+			  " interface.", MDL, client->packet_length,
+			  client->interface->name);
+	}
 }
 
 void send_release (cpp)
@@ -2242,20 +2257,29 @@ void send_release (cpp)
 	      inet_ntoa (destination.sin_addr),
 	      ntohs (destination.sin_port));
 
-	if (fallback_interface)
-		result = send_packet (fallback_interface,
-				      (struct packet *)0,
-				      &client -> packet,
-				      client -> packet_length,
-				      from, &destination,
-				      (struct hardware *)0);
-	else
+	if (fallback_interface) {
+		result = send_packet(fallback_interface, NULL, &client->packet,
+				      client->packet_length, from, &destination,
+				      NULL);
+		if (result < 0) {
+			log_error("%s:%d: Failed to send %d byte long packet"
+				  " over %s interface.", MDL,
+				  client->packet_length,
+				  fallback_interface->name);
+		}
+        } else {
 		/* Send out a packet. */
-		result = send_packet (client -> interface, (struct packet *)0,
-				      &client -> packet,
-				      client -> packet_length,
-				      from, &destination,
-				      (struct hardware *)0);
+		result = send_packet(client->interface, NULL, &client->packet,
+				      client->packet_length, from, &destination,
+				      NULL);
+		if (result < 0) {
+			log_error ("%s:%d: Failed to send %d byte long packet"
+				   " over %s interface.", MDL,
+				   client->packet_length,
+				   client->interface->name);
+		}
+
+        }
 }
 
 void
@@ -3219,7 +3243,6 @@ void script_write_params (client, prefix, lease)
 				  lease->server_name);
 		}
 	}
-				
 
 	for (i = 0; i < lease -> options -> universe_count; i++) {
 		option_space_foreach ((struct packet *)0, (struct lease *)0,
diff --git a/common/comapi.c b/common/comapi.c
index c24b4a6a..90d2262c 100644
--- a/common/comapi.c
+++ b/common/comapi.c
@@ -3,6 +3,7 @@
    OMAPI object interfaces for the DHCP server. */
 
 /*
+ * Copyright (c) 2012 Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2004-2007,2009 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1999-2003 by Internet Software Consortium
  *
@@ -435,7 +436,7 @@ isc_result_t dhcp_group_remove (omapi_object_t *lp,
 
 	status = dhcp_group_destroy ((omapi_object_t *)group, MDL);
 
-	return ISC_R_SUCCESS;
+	return status;
 }
 
 isc_result_t dhcp_control_set_value  (omapi_object_t *h,
@@ -511,12 +512,12 @@ isc_result_t dhcp_control_destroy (omapi_object_t *h,
 isc_result_t dhcp_control_signal_handler (omapi_object_t *h,
 					const char *name, va_list ap)
 {
-	dhcp_control_object_t *control;
+	/* In this function h should be a (dhcp_control_object_t *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_control)
 		return DHCP_R_INVALIDARG;
-	control = (dhcp_control_object_t *)h;
 
 	/* Try to find some inner object that can take the value. */
 	if (h -> inner && h -> inner -> type -> get_value) {
@@ -572,11 +573,11 @@ isc_result_t dhcp_control_lookup (omapi_object_t **lp,
 		status = omapi_get_value_str (ref, id, "handle", &tv);
 		if (status == ISC_R_SUCCESS) {
 			status = omapi_handle_td_lookup (lp, tv -> value);
-			
+
 			omapi_value_dereference (&tv, MDL);
 			if (status != ISC_R_SUCCESS)
 				return status;
-			
+
 			/* Don't return the object if the type is wrong. */
 			if ((*lp) -> type != dhcp_type_control) {
 				omapi_object_dereference (lp, MDL);
@@ -612,12 +613,12 @@ isc_result_t dhcp_subnet_set_value  (omapi_object_t *h,
 				     omapi_data_string_t *name,
 				     omapi_typed_data_t *value)
 {
-	struct subnet *subnet;
+	/* In this function h should be a (struct subnet *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_subnet)
 		return DHCP_R_INVALIDARG;
-	subnet = (struct subnet *)h;
 
 	/* No values to set yet. */
 
@@ -628,7 +629,7 @@ isc_result_t dhcp_subnet_set_value  (omapi_object_t *h,
 		if (status == ISC_R_SUCCESS || status == DHCP_R_UNCHANGED)
 			return status;
 	}
-			  
+
 	return ISC_R_NOTFOUND;
 }
 
@@ -637,12 +638,12 @@ isc_result_t dhcp_subnet_get_value (omapi_object_t *h, omapi_object_t *id,
 				    omapi_data_string_t *name,
 				    omapi_value_t **value)
 {
-	struct subnet *subnet;
+	/* In this function h should be a (struct subnet *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_subnet)
 		return DHCP_R_INVALIDARG;
-	subnet = (struct subnet *)h;
 
 	/* No values to get yet. */
 
@@ -658,14 +659,17 @@ isc_result_t dhcp_subnet_get_value (omapi_object_t *h, omapi_object_t *id,
 
 isc_result_t dhcp_subnet_destroy (omapi_object_t *h, const char *file, int line)
 {
+#if defined (DEBUG_MEMORY_LEAKAGE) || \
+		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
 	struct subnet *subnet;
+#endif
 
 	if (h -> type != dhcp_type_subnet)
 		return DHCP_R_INVALIDARG;
-	subnet = (struct subnet *)h;
 
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
+	subnet = (struct subnet *)h;
 	if (subnet -> next_subnet)
 		subnet_dereference (&subnet -> next_subnet, file, line);
 	if (subnet -> next_sibling)
@@ -685,13 +689,13 @@ isc_result_t dhcp_subnet_destroy (omapi_object_t *h, const char *file, int line)
 isc_result_t dhcp_subnet_signal_handler (omapi_object_t *h,
 					 const char *name, va_list ap)
 {
-	struct subnet *subnet;
+	/* In this function h should be a (struct subnet *) */
+
 	isc_result_t status;
 	int updatep = 0;
 
 	if (h -> type != dhcp_type_subnet)
 		return DHCP_R_INVALIDARG;
-	subnet = (struct subnet *)h;
 
 	/* Can't write subnets yet. */
 
@@ -711,12 +715,12 @@ isc_result_t dhcp_subnet_stuff_values (omapi_object_t *c,
 				       omapi_object_t *id,
 				       omapi_object_t *h)
 {
-	struct subnet *subnet;
+	/* In this function h should be a (struct subnet *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_subnet)
 		return DHCP_R_INVALIDARG;
-	subnet = (struct subnet *)h;
 
 	/* Can't stuff subnet values yet. */
 
@@ -761,12 +765,12 @@ isc_result_t dhcp_shared_network_set_value  (omapi_object_t *h,
 					     omapi_data_string_t *name,
 					     omapi_typed_data_t *value)
 {
-	struct shared_network *shared_network;
+	/* In this function h should be a (struct shared_network *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_shared_network)
 		return DHCP_R_INVALIDARG;
-	shared_network = (struct shared_network *)h;
 
 	/* No values to set yet. */
 
@@ -777,7 +781,7 @@ isc_result_t dhcp_shared_network_set_value  (omapi_object_t *h,
 		if (status == ISC_R_SUCCESS || status == DHCP_R_UNCHANGED)
 			return status;
 	}
-			  
+
 	return ISC_R_NOTFOUND;
 }
 
@@ -787,12 +791,12 @@ isc_result_t dhcp_shared_network_get_value (omapi_object_t *h,
 					    omapi_data_string_t *name,
 					    omapi_value_t **value)
 {
-	struct shared_network *shared_network;
+	/* In this function h should be a (struct shared_network *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_shared_network)
 		return DHCP_R_INVALIDARG;
-	shared_network = (struct shared_network *)h;
 
 	/* No values to get yet. */
 
@@ -809,14 +813,19 @@ isc_result_t dhcp_shared_network_get_value (omapi_object_t *h,
 isc_result_t dhcp_shared_network_destroy (omapi_object_t *h,
 					  const char *file, int line)
 {
+	/* In this function h should be a (struct shared_network *) */
+
+#if defined (DEBUG_MEMORY_LEAKAGE) || \
+    defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
 	struct shared_network *shared_network;
+#endif
 
 	if (h -> type != dhcp_type_shared_network)
 		return DHCP_R_INVALIDARG;
-	shared_network = (struct shared_network *)h;
 
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
+	shared_network = (struct shared_network *)h;
 	if (shared_network -> next)
 		shared_network_dereference (&shared_network -> next,
 					    file, line);
@@ -849,13 +858,13 @@ isc_result_t dhcp_shared_network_signal_handler (omapi_object_t *h,
 						 const char *name,
 						 va_list ap)
 {
-	struct shared_network *shared_network;
+	/* In this function h should be a (struct shared_network *) */
+
 	isc_result_t status;
 	int updatep = 0;
 
 	if (h -> type != dhcp_type_shared_network)
 		return DHCP_R_INVALIDARG;
-	shared_network = (struct shared_network *)h;
 
 	/* Can't write shared_networks yet. */
 
@@ -875,12 +884,12 @@ isc_result_t dhcp_shared_network_stuff_values (omapi_object_t *c,
 					       omapi_object_t *id,
 					       omapi_object_t *h)
 {
-	struct shared_network *shared_network;
+	/* In this function h should be a (struct shared_network *) */
+
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_shared_network)
 		return DHCP_R_INVALIDARG;
-	shared_network = (struct shared_network *)h;
 
 	/* Can't stuff shared_network values yet. */
 
diff --git a/common/options.c b/common/options.c
index e37fd3d8..3c08d33b 100644
--- a/common/options.c
+++ b/common/options.c
@@ -3,7 +3,7 @@
    DHCP options parsing and reassembly. */
 
 /*
- * Copyright (c) 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -2361,7 +2361,7 @@ prepare_option_buffer(struct universe *universe, struct buffer *bp,
       cleanup:
 	option_dereference(&option, MDL);
 
-	return 1;
+	return status;
 }
 
 static void
diff --git a/common/parse.c b/common/parse.c
index 0d3e7c60..434085a2 100644
--- a/common/parse.c
+++ b/common/parse.c
@@ -907,7 +907,7 @@ parse_date_core(cfile)
 	struct parse *cfile;
 {
 	int guess;
-	int tzoff, wday, year, mon, mday, hour, min, sec;
+	int tzoff, year, mon, mday, hour, min, sec;
 	const char *val;
 	enum dhcp_token token;
 	static int months[11] = { 31, 59, 90, 120, 151, 181,
@@ -945,7 +945,7 @@ parse_date_core(cfile)
 		return((TIME)0);
 	}
 	token = next_token(&val, NULL, cfile); /* consume day of week */
-	wday = atoi(val);
+        /* we are not using this for anything */
 
 	/* Year... */
 	token = peek_token(&val, NULL, cfile);
@@ -3390,11 +3390,10 @@ int parse_boolean_expression (expr, cfile, lose)
 int parse_boolean (cfile)
 	struct parse *cfile;
 {
-	enum dhcp_token token;
 	const char *val;
 	int rv;
 
-	token = next_token (&val, (unsigned *)0, cfile);
+        (void)next_token(&val, NULL, cfile);
 	if (!strcasecmp (val, "true")
 	    || !strcasecmp (val, "on"))
 		rv = 1;
diff --git a/common/print.c b/common/print.c
index e8eac799..d5d0ae07 100644
--- a/common/print.c
+++ b/common/print.c
@@ -3,7 +3,7 @@
    Turn data structures into printable text. */
 
 /*
- * Copyright (c) 2009-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2009-2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2004-2007 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-2003 by Internet Software Consortium
  *
@@ -479,10 +479,9 @@ char *print_dotted_quads (len, data)
 {
 	static char dq_buf [DQLEN + 1];
 	int i;
-	char *s, *last;
+	char *s;
 
 	s = &dq_buf [0];
-	last = s;
 	
 	i = 0;
 
diff --git a/common/socket.c b/common/socket.c
index 21e1f5f0..f95665c3 100644
--- a/common/socket.c
+++ b/common/socket.c
@@ -1000,6 +1000,9 @@ isc_result_t fallback_discard (object)
 		log_error ("fallback_discard: %m");
 		return ISC_R_UNEXPECTED;
 	}
+#else
+        /* ignore the fact that status value is never used */
+        IGNORE_UNUSED(status);
 #endif
 	return ISC_R_SUCCESS;
 }
diff --git a/dst/prandom.c b/dst/prandom.c
index 620d7140..d17aa3e1 100644
--- a/dst/prandom.c
+++ b/dst/prandom.c
@@ -1,9 +1,10 @@
 #ifndef LINT
-static const char rcsid[] = "$Header: /tmp/cvstest/DHCP/dst/prandom.c,v 1.9 2009/11/24 02:06:56 sar Exp $";
+static const char rcsid[] = "$Header: /tmp/cvstest/DHCP/dst/prandom.c,v 1.10 2012/03/09 11:18:13 tomasz Exp $";
 #endif
 /*
- * Portions Copyright (c) 1995-1998 by Trusted Information Systems, Inc.
+ * Portions Copyright (c) 2012 by Internet Systems Consortium, Inc. ("ISC")
  * Portions Copyright (c) 2007,2009 by Internet Systems Consortium, Inc. ("ISC")
+ * Portions Copyright (c) 1995-1998 by Trusted Information Systems, Inc.
  *
  * Permission to use, copy modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -694,7 +695,6 @@ own_random(dst_work *work)
 {
 	int dir = 0, b;
 	int bytes, n, cmd = 0, dig = 0;
-	int start =0;
 /* 
  * now get the initial seed to put into the quick random function from 
  * the address of the work structure 
@@ -709,7 +709,6 @@ own_random(dst_work *work)
 /* pick a random number in the range of 0..7 based on that random number
  * perform some operations that yield random data
  */
-		start = work->filled;
 		n = (dst_s_quick_random(bytes) >> DST_SHIFT) & 0x07;
 		switch (n) {
 		    case 0:
diff --git a/includes/cdefs.h b/includes/cdefs.h
index b04e5b58..d5ef422e 100644
--- a/includes/cdefs.h
+++ b/includes/cdefs.h
@@ -4,7 +4,7 @@
 
 /*
  * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
- * Copyright (c) 2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2011,2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2004,2009 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1996-2003 by Internet Software Consortium
  *
@@ -46,15 +46,25 @@
  * the warning by the use of void.  In conjunction with the use of -Werror
  * these warnings prohibit the compilation of the package.  This macro
  * allows us to assign the return value to a variable and then ignore it.
+ *
+ * __attribute__((unused)) is added for avoiding another warning about set,
+ * but unused variable. This is produced by unused-but-set-variable switch
+ * that is enabled by default in gcc 4.6.
  */
 #if !defined(__GNUC__) || (__GNUC__ < 4)
 #define IGNORE_RET(x) (void) x
 #else
 #define IGNORE_RET(x)			\
 	do {				\
-		int ignore_return;	\
-		ignore_return = x;	\
+                int __attribute__((unused)) ignore_return ;\
+                ignore_return = x;                         \
 	} while (0)
 #endif
 
+/* This macro is defined to avoid unused-but-set-variable warning
+ * that is enabled in gcc 4.6 
+ */
+
+#define IGNORE_UNUSED(x) { x = x; }
+
 #endif /* __ISC_DHCP_CDEFS_H__ */
diff --git a/omapip/handle.c b/omapip/handle.c
index b69ef126..8405acfd 100644
--- a/omapip/handle.c
+++ b/omapip/handle.c
@@ -3,7 +3,7 @@
    Functions for maintaining handles on objects. */
 
 /*
- * Copyright (c) 2009-2010 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2009-2010,2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2004-2007 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1999-2003 by Internet Software Consortium
  *
@@ -252,7 +252,6 @@ static isc_result_t omapi_handle_lookup_in (omapi_object_t **o,
 					    omapi_handle_table_t *table,
 					    int op)
 {
-	omapi_handle_table_t *inner;
 	omapi_handle_t scale, index;
 
 	if (!table || table->first > h || table->limit <= h)
@@ -282,7 +281,6 @@ static isc_result_t omapi_handle_lookup_in (omapi_object_t **o,
 	   handle must be the subtable of this table whose index into this
 	   table's array of children is the handle divided by the scale. */
 	index = (h - table->first) / scale;
-	inner = table->children[index].table;
 
 	return(omapi_handle_lookup_in(o, h, table->children[index].table, op));
 }
diff --git a/omapip/listener.c b/omapip/listener.c
index 0c4dcb13..30259eb6 100644
--- a/omapip/listener.c
+++ b/omapip/listener.c
@@ -3,6 +3,7 @@
    Subroutines that support the generic listener object. */
 
 /*
+ * Copyright (c) 2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1999-2003 by Internet Software Consortium
  *
@@ -124,7 +125,7 @@ isc_result_t omapi_listen_addr (omapi_object_t *h,
 				status = ISC_R_UNEXPECTED;
 			goto error_exit;
 		}
-	
+
 #if defined (HAVE_SETFD)
 		if (fcntl (obj -> socket, F_SETFD, 1) < 0) {
 			status = ISC_R_UNEXPECTED;
@@ -140,7 +141,7 @@ isc_result_t omapi_listen_addr (omapi_object_t *h,
 			status = ISC_R_UNEXPECTED;
 			goto error_exit;
 		}
-		
+
 		/* Try to bind to the wildcard address using the port number
 		   we were given. */
 		i = bind (obj -> socket,
@@ -369,6 +370,10 @@ static void trace_listener_accept_input (trace_type_t *ttype,
 			obj = (omapi_connection_object_t *)0;
 			status = omapi_listener_connect (&obj,
 							 lp, 0, &remote_addr);
+			if (status != ISC_R_SUCCESS) {
+				log_error("%s:%d: OMAPI: Failed to connect "
+					  "a listener.", MDL);
+			}
 			omapi_listener_dereference (&lp, MDL);
 			return;
 		}
diff --git a/server/bootp.c b/server/bootp.c
index c88fab84..477bb045 100644
--- a/server/bootp.c
+++ b/server/bootp.c
@@ -3,7 +3,8 @@
    BOOTP Protocol support. */
 
 /*
- * Copyright (c) 2004,2005,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2009,2012 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004,2005,2007 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -384,10 +385,16 @@ void bootp (packet)
 		to.sin_port = local_port;
 
 		if (fallback_interface) {
-			result = send_packet (fallback_interface,
-					      (struct packet *)0,
-					      &raw, outgoing.packet_length,
-					      from, &to, &hto);
+			result = send_packet (fallback_interface, NULL, &raw,
+					      outgoing.packet_length, from,
+					      &to, &hto);
+			if (result < 0) {
+				log_error ("%s:%d: Failed to send %d byte long "
+					   "packet over %s interface.", MDL,
+					   outgoing.packet_length,
+					   fallback_interface->name);
+			}
+
 			goto out;
 		}
 
@@ -407,10 +414,16 @@ void bootp (packet)
 	}
 
 	errno = 0;
-	result = send_packet (packet -> interface,
-			      packet, &raw, outgoing.packet_length,
-			      from, &to, &hto);
+	result = send_packet(packet->interface, packet, &raw,
+			     outgoing.packet_length, from, &to, &hto);
+	if (result < 0) {
+		log_error ("%s:%d: Failed to send %d byte long packet over %s"
+			   " interface.", MDL, outgoing.packet_length,
+			   packet->interface->name);
+	}
+
       out:
+
 	if (options)
 		option_state_dereference (&options, MDL);
 	if (lease)
diff --git a/server/db.c b/server/db.c
index c30d0fbc..6cb84f71 100644
--- a/server/db.c
+++ b/server/db.c
@@ -3,7 +3,7 @@
    Persistent database management routines for DHCPD... */
 
 /*
- * Copyright (c) 2004-2010 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2010,2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -1021,7 +1021,11 @@ void db_startup (testp)
 		/* Read in the existing lease file... */
 		status = read_conf_file (path_dhcpd_db,
 					 (struct group *)0, 0, 1);
-		/* XXX ignore status? */
+		if (status != ISC_R_SUCCESS) {
+			/* XXX ignore status? */
+			;
+		}
+
 #if defined (TRACING)
 	}
 #endif
diff --git a/server/ddns.c b/server/ddns.c
index 1f1017fe..cf2c044d 100644
--- a/server/ddns.c
+++ b/server/ddns.c
@@ -81,7 +81,6 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
 	struct option_cache *oc;
 	int s1, s2;
 	int result = 0;
-	isc_result_t rcode1 = ISC_R_SUCCESS;
 	int server_updates_a = 1;
 	//int server_updates_ptr = 1;
 	struct buffer *bp = (struct buffer *)0;
@@ -536,7 +535,11 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
 	 * the ddns messages.  Currently we don't.
 	 */
 	if (do_remove) {
-		rcode1 = ddns_removals(lease, lease6, ddns_cb, ISC_TRUE);
+		/*
+		 * We should log a more specific error closer to the actual
+		 * error if we want one. ddns_removal failure not logged here.
+		 */
+		 (void) ddns_removals(lease, lease6, ddns_cb, ISC_TRUE);
 	}
 	else {
 		ddns_fwd_srv_connector(lease, lease6, scope, ddns_cb,
diff --git a/server/dhcp.c b/server/dhcp.c
index 5875bb1b..6ef2e4ad 100644
--- a/server/dhcp.c
+++ b/server/dhcp.c
@@ -3,7 +3,7 @@
    DHCP Protocol engine. */
 
 /*
- * Copyright (c) 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1995-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -419,7 +419,6 @@ void dhcprequest (packet, ms_nulltp, ip_lease)
 #if defined (FAILOVER_PROTOCOL)
 	dhcp_failover_state_t *peer;
 #endif
-	int have_server_identifier = 0;
 	int have_requested_addr = 0;
 
 	oc = lookup_option (&dhcp_universe, packet -> options,
@@ -473,7 +472,6 @@ void dhcprequest (packet, ms_nulltp, ip_lease)
 		 * safe.
 		 */
 		sprintf (smbuf, " (%s)", piaddr (sip));
-		have_server_identifier = 1;
 	} else
 		smbuf [0] = 0;
 
@@ -969,6 +967,8 @@ void dhcpinform (packet, ms_nulltp)
 	struct sockaddr_in to;
 	struct in_addr from;
 	isc_boolean_t zeroed_ciaddr;
+	struct interface_info *interface;
+	int result;
 
 	/* The client should set ciaddr to its IP address, but apparently
 	   it's common for clients not to do this, so we'll use their IP
@@ -1169,7 +1169,7 @@ void dhcpinform (packet, ms_nulltp)
 				   packet -> options, options,
 				   &global_scope, oc, MDL)) {
 		struct universe *u = (struct universe *)0;
-		
+
 		if (!universe_hash_lookup (&u, universe_hash,
 					   (const char *)d1.data, d1.len,
 					   MDL)) {
@@ -1314,10 +1314,17 @@ void dhcpinform (packet, ms_nulltp)
 					    packet->interface->name);
 
 	errno = 0;
-	send_packet ((fallback_interface
-		      ? fallback_interface : packet -> interface),
-		     &outgoing, &raw, outgoing.packet_length,
-		     from, &to, (struct hardware *)0);
+	interface = (fallback_interface ? fallback_interface
+		     : packet -> interface);
+	result = send_packet(interface, &outgoing, &raw,
+			     outgoing.packet_length, from, &to, NULL);
+	if (result < 0) {
+		log_error ("%s:%d: Failed to send %d byte long packet over %s "
+			   "interface.", MDL, outgoing.packet_length,
+			   interface->name);
+	}
+
+
 	if (subnet)
 		subnet_dereference (&subnet, MDL);
 }
@@ -1464,6 +1471,13 @@ void nak_lease (packet, cip)
 			result = send_packet(fallback_interface, packet, &raw,
 					     outgoing.packet_length, from, &to,
 					     NULL);
+			if (result < 0) {
+				log_error ("%s:%d: Failed to send %d byte long "
+					   "packet over %s interface.", MDL,
+					   outgoing.packet_length,
+					   fallback_interface->name);
+			}
+
 			return;
 		}
 	} else {
@@ -1474,6 +1488,12 @@ void nak_lease (packet, cip)
 	errno = 0;
 	result = send_packet(packet->interface, packet, &raw,
 			     outgoing.packet_length, from, &to, NULL);
+        if (result < 0) {
+                log_error ("%s:%d: Failed to send %d byte long packet over %s "
+                           "interface.", MDL, outgoing.packet_length,
+                           packet->interface->name);
+        }
+
 }
 
 void ack_lease (packet, lease, offer, when, msg, ms_nulltp, hp)
@@ -3214,11 +3234,16 @@ void dhcp_reply (lease)
 			to.sin_port = remote_port; /* For debugging. */
 
 		if (fallback_interface) {
-			result = send_packet (fallback_interface,
-					      (struct packet *)0,
-					      &raw, packet_length,
-					      raw.siaddr, &to,
-					      (struct hardware *)0);
+			result = send_packet(fallback_interface, NULL, &raw,
+					     packet_length, raw.siaddr, &to,
+					     NULL);
+			if (result < 0) {
+				log_error ("%s:%d: Failed to send %d byte long "
+					   "packet over %s interface.", MDL,
+					   packet_length,
+					   fallback_interface->name);
+			}
+
 
 			free_lease_state (state, MDL);
 			lease -> state = (struct lease_state *)0;
@@ -3247,11 +3272,16 @@ void dhcp_reply (lease)
 		to.sin_port = remote_port;
 
 		if (fallback_interface) {
-			result = send_packet (fallback_interface,
-					      (struct packet *)0,
-					      &raw, packet_length,
-					      raw.siaddr, &to,
-					      (struct hardware *)0);
+			result = send_packet(fallback_interface, NULL, &raw,
+					     packet_length, raw.siaddr, &to,
+					     NULL);
+			if (result < 0) {
+				log_error("%s:%d: Failed to send %d byte long"
+					  " packet over %s interface.", MDL,
+					   packet_length,
+					   fallback_interface->name);
+			}
+
 			free_lease_state (state, MDL);
 			lease -> state = (struct lease_state *)0;
 			return;
@@ -3276,10 +3306,14 @@ void dhcp_reply (lease)
 
 	memcpy (&from, state -> from.iabuf, sizeof from);
 
-	result = send_packet (state -> ip,
-			      (struct packet *)0, &raw, packet_length,
-			      from, &to,
-			      unicastp ? &hto : (struct hardware *)0);
+	result = send_packet(state->ip, NULL, &raw, packet_length,
+			      from, &to, unicastp ? &hto : NULL);
+	if (result < 0) {
+	    log_error ("%s:%d: Failed to send %d byte long "
+		       "packet over %s interface.", MDL,
+		       packet_length, state->ip->name);
+	}
+
 
 	/* Free all of the entries in the option_state structure
 	   now that we're done with them. */
diff --git a/server/dhcpv6.c b/server/dhcpv6.c
index 2e88d7fb..3e7a9807 100644
--- a/server/dhcpv6.c
+++ b/server/dhcpv6.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2006-2012 by Internet Systems Consortium, Inc. ("ISC")
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -4617,7 +4617,6 @@ iterate_over_ia_na(struct data_string *reply_ret,
 	struct option_state *host_opt_state;
 	struct data_string iaaddr;
 	struct data_string fixed_addr;
-	int iaaddr_is_found;
 	char reply_data[65536];
 	struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data;
 	int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options));
@@ -4724,7 +4723,6 @@ iterate_over_ia_na(struct data_string *reply_ret,
 	 */
 	for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA);
 	     ia != NULL; ia = ia->next) {
-	     	iaaddr_is_found = 0;
 
 		if (!get_encapsulated_IA_state(&cli_enc_opt_state,
 					       &cli_enc_opt_data,
@@ -5136,7 +5134,6 @@ iterate_over_ia_pd(struct data_string *reply_ret,
 	struct host_decl *host;
 	struct option_state *host_opt_state;
 	struct data_string iaprefix;
-	int iaprefix_is_found;
 	char reply_data[65536];
 	int reply_ofs;
 	struct iasubopt *prefix;
@@ -5203,7 +5200,6 @@ iterate_over_ia_pd(struct data_string *reply_ret,
 	 */
 	for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD);
 	     ia != NULL; ia = ia->next) {
-	    iaprefix_is_found = 0;
 
 	    if (!get_encapsulated_IA_state(&cli_enc_opt_state,
 					   &cli_enc_opt_data,
diff --git a/server/failover.c b/server/failover.c
index 26be290c..8d7fe789 100644
--- a/server/failover.c
+++ b/server/failover.c
@@ -3,7 +3,7 @@
    Failover protocol support code... */
 
 /*
- * Copyright (c) 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1999-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -32,6 +32,7 @@
  * ``http://www.nominum.com''.
  */
 
+#include "cdefs.h"
 #include "dhcpd.h"
 #include <omapip/omapip_p.h>
 
@@ -2412,7 +2413,8 @@ dhcp_failover_pool_dobalance(dhcp_failover_state_t *state,
 	struct shared_network *s;
 	struct pool *p;
 	binding_state_t peer_lease_state;
-	binding_state_t my_lease_state;
+	/* binding_state_t my_lease_state; */
+        /* XXX Why is this my_lease_state never used? */
 	struct lease **lq;
 	int (*log_func)(const char *, ...);
 	const char *result, *reqlog;
@@ -2436,12 +2438,12 @@ dhcp_failover_pool_dobalance(dhcp_failover_state_t *state,
 		if (p->failover_peer->i_am == primary) {
 			lts = (p->free_leases - p->backup_leases) / 2;
 			peer_lease_state = FTS_BACKUP;
-			my_lease_state = FTS_FREE;
+			/* my_lease_state = FTS_FREE; */
 			lq = &p->free;
 		} else {
 			lts = (p->backup_leases - p->free_leases) / 2;
 			peer_lease_state = FTS_FREE;
-			my_lease_state = FTS_BACKUP;
+			/* my_lease_state = FTS_BACKUP; */
 			lq = &p->backup;
 		}
 
@@ -3257,13 +3259,13 @@ isc_result_t dhcp_failover_state_stuff (omapi_object_t *c,
 					omapi_object_t *id,
 					omapi_object_t *h)
 {
+	/* In this function c should be a (omapi_connection_object_t *) */
+
 	dhcp_failover_state_t *s;
-	omapi_connection_object_t *conn;
 	isc_result_t status;
 
 	if (c -> type != omapi_type_connection)
 		return DHCP_R_INVALIDARG;
-	conn = (omapi_connection_object_t *)c;
 
 	if (h -> type != dhcp_type_failover_state)
 		return DHCP_R_INVALIDARG;
@@ -4306,6 +4308,8 @@ void dhcp_failover_send_contact (void *vstate)
 	if (obufix) {
 		log_debug ("%s", obuf);
 	}
+#else
+        IGNORE_UNUSED(status);
 #endif
 	return;
 }
@@ -4354,6 +4358,8 @@ isc_result_t dhcp_failover_send_state (dhcp_failover_state_t *state)
 	if (obufix) {
 		log_debug ("%s", obuf);
 	}
+#else
+        IGNORE_UNUSED(status);
 #endif
 	return ISC_R_SUCCESS;
 }
@@ -4490,7 +4496,6 @@ isc_result_t dhcp_failover_send_disconnect (omapi_object_t *l,
 					    const char *message)
 {
 	dhcp_failover_link_t *link;
-	dhcp_failover_state_t *state;
 	isc_result_t status;
 #if defined (DEBUG_FAILOVER_MESSAGES)	
 	char obuf [64];
@@ -4505,7 +4510,6 @@ isc_result_t dhcp_failover_send_disconnect (omapi_object_t *l,
 	if (!l || l -> type != dhcp_type_failover_link)
 		return DHCP_R_INVALIDARG;
 	link = (dhcp_failover_link_t *)l;
-	state = link -> state_object;
 	if (!l -> outer || l -> outer -> type != omapi_type_connection)
 		return DHCP_R_INVALIDARG;
 
diff --git a/server/omapi.c b/server/omapi.c
index 26294352..22b5358a 100644
--- a/server/omapi.c
+++ b/server/omapi.c
@@ -3,7 +3,7 @@
    OMAPI object interfaces for the DHCP server. */
 
 /*
- * Copyright (c) 2004-2009 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2009,2012 by Internet Systems Consortium, Inc. ("ISC")
  * Copyright (c) 1999-2003 by Internet Software Consortium
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -480,12 +480,11 @@ isc_result_t dhcp_lease_destroy (omapi_object_t *h, const char *file, int line)
 isc_result_t dhcp_lease_signal_handler (omapi_object_t *h,
 					const char *name, va_list ap)
 {
-	struct lease *lease;
+	/* h should point to (struct lease *) */
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_lease)
 		return DHCP_R_INVALIDARG;
-	lease = (struct lease *)h;
 
 	if (!strcmp (name, "updated"))
 		return ISC_R_SUCCESS;
@@ -1175,14 +1174,13 @@ isc_result_t dhcp_host_get_value (omapi_object_t *h, omapi_object_t *id,
 
 isc_result_t dhcp_host_destroy (omapi_object_t *h, const char *file, int line)
 {
-	struct host_decl *host;
 
 	if (h -> type != dhcp_type_host)
 		return DHCP_R_INVALIDARG;
-	host = (struct host_decl *)h;
 
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
+	struct host_decl *host = (struct host_decl *)h;
 	if (host -> n_ipaddr)
 		host_dereference (&host -> n_ipaddr, file, line);
 	if (host -> n_dynamic)
@@ -1388,7 +1386,7 @@ isc_result_t dhcp_host_lookup (omapi_object_t **lp,
 				  tv -> value -> u.buffer.value,
 				  tv -> value -> u.buffer.len, MDL);
 		omapi_value_dereference (&tv, MDL);
-			
+
 		if (*lp && *lp != (omapi_object_t *)host) {
 			omapi_object_dereference (lp, MDL);
 			if (host)
@@ -1594,12 +1592,11 @@ isc_result_t dhcp_pool_set_value  (omapi_object_t *h,
 				   omapi_data_string_t *name,
 				   omapi_typed_data_t *value)
 {
-	struct pool *pool;
+	/* h should point to (struct pool *) */
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_pool)
 		return DHCP_R_INVALIDARG;
-	pool = (struct pool *)h;
 
 	/* No values to set yet. */
 
@@ -1619,12 +1616,11 @@ isc_result_t dhcp_pool_get_value (omapi_object_t *h, omapi_object_t *id,
 				  omapi_data_string_t *name,
 				  omapi_value_t **value)
 {
-	struct pool *pool;
+	/* h should point to (struct pool *) */
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_pool)
 		return DHCP_R_INVALIDARG;
-	pool = (struct pool *)h;
 
 	/* No values to get yet. */
 
@@ -1640,7 +1636,6 @@ isc_result_t dhcp_pool_get_value (omapi_object_t *h, omapi_object_t *id,
 
 isc_result_t dhcp_pool_destroy (omapi_object_t *h, const char *file, int line)
 {
-	struct pool *pool;
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
 	struct permit *pc, *pn;
@@ -1648,10 +1643,10 @@ isc_result_t dhcp_pool_destroy (omapi_object_t *h, const char *file, int line)
 
 	if (h -> type != dhcp_type_pool)
 		return DHCP_R_INVALIDARG;
-	pool = (struct pool *)h;
 
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
+	struct pool *pool = (struct pool *)h;
 	if (pool -> next)
 		pool_dereference (&pool -> next, file, line);
 	if (pool -> group)
@@ -1692,13 +1687,12 @@ isc_result_t dhcp_pool_destroy (omapi_object_t *h, const char *file, int line)
 isc_result_t dhcp_pool_signal_handler (omapi_object_t *h,
 				       const char *name, va_list ap)
 {
-	struct pool *pool;
+	/* h should point to (struct pool *) */
 	isc_result_t status;
 	int updatep = 0;
 
 	if (h -> type != dhcp_type_pool)
 		return DHCP_R_INVALIDARG;
-	pool = (struct pool *)h;
 
 	/* Can't write pools yet. */
 
@@ -1718,12 +1712,11 @@ isc_result_t dhcp_pool_stuff_values (omapi_object_t *c,
 				     omapi_object_t *id,
 				     omapi_object_t *h)
 {
-	struct pool *pool;
+	/* h should point to (struct pool *) */
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_pool)
 		return DHCP_R_INVALIDARG;
-	pool = (struct pool *)h;
 
 	/* Can't stuff pool values yet. */
 
@@ -1951,14 +1944,13 @@ isc_result_t dhcp_class_get_value (omapi_object_t *h, omapi_object_t *id,
 
 isc_result_t dhcp_class_destroy (omapi_object_t *h, const char *file, int line)
 {
-	struct class *class;
 
 	if (h -> type != dhcp_type_class && h -> type != dhcp_type_subclass)
 		return DHCP_R_INVALIDARG;
-	class = (struct class *)h;
 
 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
+	struct class *class = (struct class *)h;
 	if (class -> nic)
 		class_dereference (&class -> nic, file, line);
 	if (class -> superclass)
@@ -2065,7 +2057,7 @@ class_signal_handler(omapi_object_t *h,
 
 	if (updatep)
 		return ISC_R_SUCCESS;
-	
+
 	return ISC_R_NOTFOUND;
 }
 
@@ -2083,12 +2075,11 @@ isc_result_t dhcp_class_stuff_values (omapi_object_t *c,
 				      omapi_object_t *id,
 				      omapi_object_t *h)
 {
-	struct class *class;
+	/* h should point to (struct class *) */
 	isc_result_t status;
 
 	if (h -> type != dhcp_type_class)
 		return DHCP_R_INVALIDARG;
-	class = (struct class *)h;
 
 	/* Can't stuff class values yet. */