From 355828e64f6fa07eb96bc6b27eef964b529d8778 Mon Sep 17 00:00:00 2001
From: Alexander Barton <alex@barton.de>
Date: Wed, 9 Apr 2008 19:03:24 +0200
Subject: [PATCH] Enable the daemon to dump its internal state in debug-mode.

This patch allows ngIRCd to dump its internal state (connected clients,
actual configuration) when compiled with --enable-debug. The daemon
catches two more signals:

 - SIGUSR1: toggle debug mode (on/off),
 - SIGUSR2: dump internal state to console/syslog.
---
 src/ngircd/client.c      | 22 ++++++++++++++++++++
 src/ngircd/client.h      |  6 ++++++
 src/ngircd/conf.c        | 23 +++++++++++++++++++++
 src/ngircd/conf.h        |  4 ++++
 src/ngircd/ngircd.c      |  2 ++
 src/ngircd/sighandlers.c | 44 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 101 insertions(+)

diff --git a/src/ngircd/client.c b/src/ngircd/client.c
index f73a2d1e..d53dc969 100644
--- a/src/ngircd/client.c
+++ b/src/ngircd/client.c
@@ -1274,4 +1274,26 @@ Destroy_UserOrService(CLIENT *Client, const char *Txt, const char *FwdMsg, bool
 } /* Destroy_UserOrService */
 
 
+#ifdef DEBUG
+
+GLOBAL void
+Client_DebugDump(void)
+{
+	CLIENT *c;
+
+	Log(LOG_DEBUG, "Client status:");
+	c = My_Clients;
+	while (c) {
+		Log(LOG_DEBUG,
+		    " - %s, type=%d, host=%s, user=%s, conn=%d, start=%ld, flags=%s",
+                   Client_ID(c), Client_Type(c), Client_Hostname(c),
+                   Client_User(c), Client_Conn(c), Client_StartTime(c),
+                   Client_Flags(c));
+		c = (CLIENT *)c->next;
+	}
+} /* Client_DumpClients */
+
+#endif
+
+
 /* -eof- */
diff --git a/src/ngircd/client.h b/src/ngircd/client.h
index 98a0d1a4..42036c4e 100644
--- a/src/ngircd/client.h
+++ b/src/ngircd/client.h
@@ -157,6 +157,12 @@ GLOBAL void Client_RegisterWhowas PARAMS(( CLIENT *Client ));
 
 GLOBAL const char *Client_TypeText PARAMS((CLIENT *Client));
 
+#ifdef DEBUG
+GLOBAL void Client_DebugDump PARAMS((void));
 #endif
 
+
+#endif
+
+
 /* -eof- */
diff --git a/src/ngircd/conf.c b/src/ngircd/conf.c
index a70973e7..5619a6c7 100644
--- a/src/ngircd/conf.c
+++ b/src/ngircd/conf.c
@@ -1524,6 +1524,29 @@ va_dcl
 } /* Config_Error */
 
 
+#ifdef DEBUG
+
+GLOBAL void
+Conf_DebugDump(void)
+{
+	int i;
+
+	Log(LOG_DEBUG, "Configured servers:");
+	for (i = 0; i < MAX_SERVERS; i++) {
+		if (! Conf_Server[i].name[0])
+			continue;
+		Log(LOG_DEBUG,
+		    " - %s: %s:%d, last=%ld, group=%d, flags=%d, conn=%d",
+		    Conf_Server[i].name, Conf_Server[i].host,
+		    Conf_Server[i].port, Conf_Server[i].lasttry,
+		    Conf_Server[i].group, Conf_Server[i].flags,
+		    Conf_Server[i].conn_id);
+	}
+} /* Conf_DebugDump */
+
+#endif
+
+
 static void
 Init_Server_Struct( CONF_SERVER *Server )
 {
diff --git a/src/ngircd/conf.h b/src/ngircd/conf.h
index e7b84d2e..5cf5f6b1 100644
--- a/src/ngircd/conf.h
+++ b/src/ngircd/conf.h
@@ -191,6 +191,10 @@ GLOBAL bool Conf_IsService PARAMS((int ConfServer, const char *Nick));
 /* Password required by WEBIRC command */
 GLOBAL char Conf_WebircPwd[CLIENT_PASS_LEN];
 
+#ifdef DEBUG
+GLOBAL void Conf_DebugDump PARAMS((void));
+#endif
+
 
 #endif
 
diff --git a/src/ngircd/ngircd.c b/src/ngircd/ngircd.c
index 2fd60ef8..d4d4d5f9 100644
--- a/src/ngircd/ngircd.c
+++ b/src/ngircd/ngircd.c
@@ -69,6 +69,7 @@ static void Setup_FDStreams PARAMS(( int fd ));
 
 static bool NGIRCd_Init PARAMS(( bool ));
 
+
 /**
  * The main() function of ngIRCd.
  * Here all starts: this function is called by the operating system loader,
@@ -723,4 +724,5 @@ NGIRCd_Init( bool NGIRCd_NoDaemon )
 	return false;
 }
 
+
 /* -eof- */
diff --git a/src/ngircd/sighandlers.c b/src/ngircd/sighandlers.c
index 7d65510e..688a8f02 100644
--- a/src/ngircd/sighandlers.c
+++ b/src/ngircd/sighandlers.c
@@ -36,6 +36,22 @@
 
 static int signalpipe[2];
 
+
+#ifdef DEBUG
+
+static void
+Dump_State(void)
+{
+	Log(LOG_DEBUG, "--- Internal server state: ---");
+	Log(LOG_DEBUG, "time()=%ld", time(NULL));
+	Conf_DebugDump();
+	Client_DebugDump();
+	Log(LOG_DEBUG, "--- End of state dump ---");
+} /* Dump_State */
+
+#endif
+
+
 static void Signal_Block(int sig)
 {
 #ifdef HAVE_SIGPROCMASK
@@ -140,6 +156,30 @@ static void Signal_Handler(int Signal)
 		while (waitpid( -1, NULL, WNOHANG) > 0)
 			;
 		return;
+#ifdef DEBUG
+	case SIGUSR1:
+		if (! NGIRCd_Debug) {
+			Log(LOG_INFO|LOG_snotice,
+			    "Got SIGUSR1, debug mode activated.");
+#ifdef SNIFFER
+			strcpy(NGIRCd_DebugLevel, "2");
+			NGIRCd_Debug = true;
+			NGIRCd_Sniffer = true;
+#else
+			strcpy(NGIRCd_DebugLevel, "1");
+			NGIRCd_Debug = true;
+#endif /* SNIFFER */
+		} else {
+			Log(LOG_INFO|LOG_snotice,
+			    "Got SIGUSR1, debug mode deactivated.");
+			strcpy(NGIRCd_DebugLevel, "");
+			NGIRCd_Debug = false;
+#ifdef SNIFFER
+			NGIRCd_Sniffer = false;
+#endif /* SNIFFER */
+		}
+		return;
+#endif
 	}
 
 	/*
@@ -169,6 +209,10 @@ static void Signal_Handler_BH(int Signal)
 		NGIRCd_Rehash();
 		break;
 #ifdef DEBUG
+	case SIGUSR2:
+		if (NGIRCd_Debug)
+			Dump_State();
+		break;
 	default:
 		Log(LOG_DEBUG, "Got signal %d! Ignored.", Signal);
 #endif
-- 
2.39.2