[master] Add configure option to incude PID in syslog entries

RELNOTES

@@ -133,6 +133,12 @@ by Eric Young (eay@cryptsoft.com).
   When processing a "--version" request don't output the version information
   to syslog.
 
+- Add the "enable-log-pid" option to the configure script.  When enabled
+  this causes the client, server and relay programs to include the PID
+  number in syslog messages.
+  Thanks to Marius Tomaschewski for the suggestion and proto-patch.
+  [ISC-Bugs #29713]
+
 			Changes since 4.3.0rc1
 
 - None

client/dhclient.c

@@ -140,7 +140,7 @@ main(int argc, char **argv) {
 	else if (fd != -1)
 		close(fd);
 
-	openlog("dhclient", LOG_NDELAY, LOG_DAEMON);
+	openlog("dhclient", DHCP_LOG_OPTIONS, LOG_DAEMON);
 
 #if !(defined(DEBUG) || defined(__CYGWIN32__))
 	setlogmask(LOG_UPTO(LOG_INFO));

configure

@@ -746,6 +746,7 @@ enable_early_chroot
 enable_ipv4_pktinfo
 enable_use_sockets
 enable_secs_byteorder
+enable_log_pid
 with_atf
 with_srv_lease_file
 with_srv6_lease_file
@@ -1414,6 +1415,7 @@ Optional Features:
   --enable-use-sockets    use the standard BSD socket API (default is no)
   --enable-secs-byteorder Correct bad byteorders in the secs field (default is
                           no).
+  --enable-log-pid        Include PIDs in syslog messages (default is no).
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -5400,6 +5402,20 @@ $as_echo "#define SECS_BYTEORDER 1" >>confdefs.h
 
 fi
 
+# Include the PID in the log messages.  This is useful when there may be multiple
+# instances of a program.
+# This is off by default
+# Check whether --enable-log_pid was given.
+if test "${enable_log_pid+set}" = set; then :
+  enableval=$enable_log_pid;
+fi
+
+if test "$enable_log_pid" = "yes" ; then
+
+$as_echo "#define USE_LOG_PID 1" >>confdefs.h
+
+fi
+
 # Testing section
 
 atf_path="no"

configure.ac

@@ -171,6 +171,16 @@ if test "$enable_secs_byteorder" = "yes" ; then
 		[Define to correct bad byteorders in secs field.])
 fi
 
+# Include the PID in the log messages.  This is useful when there may
+# be multiple instances of a program.
+# This is off by default
+AC_ARG_ENABLE(log_pid,
+	AS_HELP_STRING([--enable-log-pid],[Include PIDs in syslog messages (default is no).]))
+if test "$enable_log_pid" = "yes" ; then
+	AC_DEFINE([USE_LOG_PID], [1],
+		[Define to include PIDs in syslog messages.])
+fi
+
 # Testing section
 
 atf_path="no"

dhcpctl/omshell.c

@@ -100,7 +100,7 @@ main(int argc, char **argv) {
 	}
 
 	/* Initially, log errors to stderr as well as to syslogd. */
-	openlog ("omshell", LOG_NDELAY, DHCPD_LOG_FACILITY);
+	openlog ("omshell", DHCP_LOG_OPTIONS, DHCPD_LOG_FACILITY);
 	status = dhcpctl_initialize ();
 	if (status != ISC_R_SUCCESS) {
 		fprintf (stderr, "dhcpctl_initialize: %s\n",

includes/config.h.in

@@ -148,6 +148,9 @@
 /* Define to include server activity tracing support. */
 #undef TRACING
 
+/* Define to include PIDs in syslog messages. */
+#undef USE_LOG_PID
+
 /* Define to 1 to use the standard BSD socket API. */
 #undef USE_SOCKETS
 

includes/dhcpd.h

@@ -1484,6 +1484,12 @@ typedef unsigned char option_mask [16];
 #define MAX_TIME 0x7fffffff
 #define MIN_TIME 0
 
+#ifdef USE_LOG_PID
+/* include the pid in the syslog messages */
+#define DHCP_LOG_OPTIONS LOG_NDELAY | LOG_PID
+#else
+#define DHCP_LOG_OPTIONS LOG_NDELAY
+#endif
 						/* these are referenced */
 typedef struct hash_table ia_hash_t;
 typedef struct hash_table iasubopt_hash_t;

relay/dhcrelay.c

@@ -197,7 +197,7 @@ main(int argc, char **argv) {
 	else if (fd != -1)
 		close(fd);
 
-	openlog("dhcrelay", LOG_NDELAY, LOG_DAEMON);
+	openlog("dhcrelay", DHCP_LOG_OPTIONS, LOG_DAEMON);
 
 #if !defined(DEBUG)
 	setlogmask(LOG_UPTO(LOG_INFO));

server/dhcpd.c

@@ -220,7 +220,7 @@ main(int argc, char **argv) {
 	dhcp_common_objects_setup ();
 
 	/* Initially, log errors to stderr as well as to syslogd. */
-	openlog ("dhcpd", LOG_NDELAY, DHCPD_LOG_FACILITY);
+	openlog ("dhcpd", DHCP_LOG_OPTIONS, DHCPD_LOG_FACILITY);
 
 	for (i = 1; i < argc; i++) {
 		if (!strcmp (argv [i], "-p")) {
@@ -1021,7 +1021,7 @@ void postconf_initialization (int quiet)
 					  &global_scope, oc, MDL)) {
 			if (db.len == 1) {
 				closelog ();
-				openlog("dhcpd", LOG_NDELAY, db.data[0]);
+				openlog("dhcpd", DHCP_LOG_OPTIONS, db.data[0]);
 				/* Log the startup banner into the new
 				   log file. */
 				if (!quiet) {