Add umode +V, which blocks invites to anyone with it set.

help/opers/umode

@@ -17,4 +17,5 @@ Usermodes: (* designates that the umode is oper only)
          +D     - Deaf - ignores all channel messages.
          +Q     - Prevents you from being affected by channel forwarding.
          +R     - Prevents non accept unidentified users from messaging you.
+         +V     - Prevents you from receiving invites.
          +Z     - Is connected via SSL (cannot be set or unset).

help/users/umode

@@ -13,4 +13,5 @@ Usermodes:
          +D     - Deaf - ignores all channel messages.
          +Q     - Prevents you from being affected by channel forwarding.
          +R     - Prevents non accept unidentified users from messaging you.
+         +V     - Prevents you from receiving invites.
          +Z     - Is connected via SSL (cannot be set or unset).

include/client.h

@@ -422,6 +422,7 @@ struct ListClient
 #define UMODE_NOFORWARD    0x0100	/* don't forward */
 #define UMODE_REGONLYMSG   0x0200	/* only allow logged in users to msg */
 #define UMODE_NOCTCP	0x0400		/* block CTCPs except for ACTION */
+#define UMODE_NOINVITE	   0x0800	/* block invites */
 
 /* user information flags, only settable by remote mode or local oper */
 #define UMODE_OPER         0x1000	/* Operator */
@@ -516,6 +517,7 @@ struct ListClient
 #define IsNoForward(x)		((x)->umodes & UMODE_NOFORWARD)
 #define IsSetRegOnlyMsg(x)	((x)->umodes & UMODE_REGONLYMSG)
 #define IsSetNoCTCP(x)		((x)->umodes & UMODE_NOCTCP)
+#define IsSetNoInvite(x)	((x)->umodes & UMODE_NOINVITE)
 
 #define SetGotId(x)             ((x)->flags |= FLAGS_GOTID)
 #define IsGotId(x)              (((x)->flags & FLAGS_GOTID) != 0)

include/numeric.h

@@ -257,6 +257,8 @@ extern const char *form_str(int);
 #define ERR_SUMMONDISABLED   445
 #define ERR_USERSDISABLED    446
 
+#define ERR_NOINVITE	     447
+
 #define ERR_NOTREGISTERED    451
 
 #define ERR_ACCEPTFULL       456

modules/m_invite.c

@@ -153,6 +153,14 @@ m_invite(struct Client *client_p, struct Client *source_p, int parc, const char
 		return 0;
 	}
 
+	if (IsSetNoInvite(target_p))
+	{
+		sendto_one_numeric(source_p, ERR_NOINVITE,
+				form_str(ERR_NOINVITE),
+				target_p->name);
+		return 0;
+	}
+
 	/* store invites when they could affect the ability to join
 	 * for +l/+j just check if the mode is set, this varies over time
 	 */

src/messages.tab

@@ -468,7 +468,7 @@ static  const char *  replies[] = {
 /* 444 ERR_NOLOGIN, */		NULL,
 /* 445 ERR_SUMMONDISABLED, */	NULL,
 /* 446 ERR_USERSDISABLED, */	NULL,
-/* 447 */       NULL,
+/* 447 ERR_NOINVITE */       	":Can't send invite to %s (+V set)",
 /* 448 */       NULL,
 /* 449 */       NULL,
 /* 450 */       NULL,

src/newconf.c

@@ -304,6 +304,7 @@ static struct mode_table umode_table[] = {
 	{"wallop",	UMODE_WALLOP	},
 	{"operwall",	UMODE_OPERWALL	},
 	{"noctcp",		UMODE_NOCTCP	},
+	{"noinvite",	UMODE_NOINVITE	},
 	{NULL, 0}
 };
 

src/s_user.c

@@ -88,7 +88,7 @@ int user_modes[256] = {
 	UMODE_SERVICE,		/* S */
 	0,			/* T */
 	0,			/* U */
-	0,			/* V */
+	UMODE_NOINVITE,		/* V */
 	0,			/* W */
 	0,			/* X */
 	0,			/* Y */