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commit 9d97004a287589681342a0116746796f2764100c
Author: DNS 
Date:   Mon Oct 8 12:11:04 2012 +0200

    Implement user mode "b": block messages

    When a user has set mode "b", all private messages and notices to this
    user are blocked if they don't originate from a registered user, an IRC Op,
    server or service. The originator gets an error numeric sent back in this
    case, ERR_CANNOTSENDTONICK_MSG(976), which is/was(?) used by KineIRCd, too.

    This closes bug #144.

diff --git a/doc/Modes.txt b/doc/Modes.txt

--- a/doc/Modes.txt
+++ b/doc/Modes.txt
@@ -22,6 +22,7 @@ channels he is using at the moment.
   mode	since	description

   a	0.3.0	User is away.
+  b	20	User blocks private messages and notices.
   B	20	User is flagged as a "bot".
   c	17	IRC operator wants to receive connect/disconnect NOTICEs.
   C	19	Only users that share a channel are allowed to send messages.
diff --git a/src/ngircd/defines.h b/src/ngircd/defines.h

--- a/src/ngircd/defines.h
+++ b/src/ngircd/defines.h
@@ -161,7 +161,7 @@
 #endif

 /** Supported user modes. */
-#define USERMODES "aBcCioqrRswx"
+#define USERMODES "abBcCioqrRswx"

 /** Supported channel modes. */
 #define CHANMODES "abehiIklmMnoOPqQrRstvVz"
diff --git a/src/ngircd/irc-mode.c b/src/ngircd/irc-mode.c

--- a/src/ngircd/irc-mode.c
+++ b/src/ngircd/irc-mode.c
@@ -215,6 +215,7 @@ Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
 		/* Validate modes */
 		x[0] = '\0';
 		switch (*mode_ptr) {
+		case 'b': /* Block private msgs */
 		case 'C': /* Only messages from clients sharing a channel */
 		case 'i': /* Invisible */
 		case 's': /* Server messages */
diff --git a/src/ngircd/irc.c b/src/ngircd/irc.c

--- a/src/ngircd/irc.c
+++ b/src/ngircd/irc.c
@@ -500,6 +500,17 @@ Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 				Req->command = "PRIVMSG";
 			}
 #endif
+			if (Client_HasMode(cl, 'b') &&
+			    !Client_HasMode(from, 'R') &&
+			    !Client_HasMode(from, 'o') &&
+			    !(Client_Type(from) == CLIENT_SERVER) &&
+			    !(Client_Type(from) == CLIENT_SERVICE)) {
+				if (SendErrors && !IRC_WriteStrClient(from,
+						ERR_CANNOTSENDTONICK_MSG,
+						Client_ID(from), Client_ID(cl)))
+					return DISCONNECTED;
+				goto send_next_target;
+			}

 			if (Client_HasMode(cl, 'C')) {
 				cl2chan = Channel_FirstChannelOf(cl);
diff --git a/src/ngircd/messages.h b/src/ngircd/messages.h

--- a/src/ngircd/messages.h
+++ b/src/ngircd/messages.h
@@ -151,6 +151,7 @@
 #define ERR_UMODEUNKNOWNFLAG2_MSG	"501 %s :Unknown mode \"%c%c\""
 #define ERR_USERSDONTMATCH_MSG		"502 %s :Can't set/get mode for other users"
 #define ERR_NOINVITE_MSG		"518 %s :Cannot invite to %s (+V)"
+#define ERR_CANNOTSENDTONICK_MSG	"976 %s :Cannot send to user (+b) -- Only registered users can message %s"

 #ifdef ZLIB
 # define RPL_STATSLINKINFOZIP_MSG	"211 %s %s %d %ld %ld/%ld %ld %ld/%ld :%ld"

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