Don't require sysop system password re-authentication unless 15 minutes

or more have elapsed since the last system password (SY:) prompt. Similar
to Linux 'sudo' command. Might make this time configurable rather than
hard-coded at some point, but 15 minutes seems like a good default.

src/sbbs3/con_hi.cpp

-/* con_hi.cpp */
-
 /* Synchronet hi-level console routines */
+// vi: tabstop=4
 
 /* $Id$ */
 
@@ -155,6 +154,8 @@ bool sbbs_t::chksyspass(const char* sys_pw)
 		logline(LOG_NOTICE,"S!","Remote sysop access disabled");
 		return(false);
 	}
+	if(time(NULL) - last_sysop_auth < 15*60)
+		return true;
 	if(sys_pw != NULL)
 		SAFECOPY(str, sys_pw);
 	else {
@@ -172,5 +173,6 @@ bool sbbs_t::chksyspass(const char* sys_pw)
 		logline(LOG_NOTICE,"S!",str2);
 		return(false); 
 	}
+	last_sysop_auth = time(NULL);
 	return(true);
 }

src/sbbs3/main.cpp

@@ -3162,6 +3162,7 @@ sbbs_t::sbbs_t(ushort node_num, union xp_sockaddr *addr, size_t addr_len, const
 	scanposts_inside = false;
 	scansubs_inside = false;
 	timeleft = 60*10;	/* just incase this is being used for calling gettimeleft() */
+	last_sysop_auth = 0;
 	uselect_total = 0;
 	lbuflen = 0;
 	keybufbot=keybuftop=0;	/* initialize [unget]keybuf pointers */

src/sbbs3/sbbs.h

@@ -463,6 +463,7 @@ public:
 	ulong	console;		/* Defines current Console settings */
 	char 	wordwrap[81];	/* Word wrap buffer */
 	time_t	now,			/* Used to store current time in Unix format */
+			last_sysop_auth,/* Time sysop was last authenticated */
 			answertime, 	/* Time call was answered */
 			logontime,		/* Time user logged on */
 			starttime,		/* Time stamp to use for time left calcs */