The changes to telnet/commands.c fix fix a crash in the tracefile
command on 64-bit architectures due to pointer truncation.

The telnetd.c change is just to avoid a future compiler error.

diff -ur netkit-telnet-0.17.orig/telnet/commands.c netkit-telnet-0.17/telnet/commands.c
--- netkit-telnet-0.17.orig/telnet/commands.c	2023-12-21 12:28:51.146313891 +0100
+++ netkit-telnet-0.17/telnet/commands.c	2023-12-21 12:58:47.177886556 +0100
@@ -843,7 +843,7 @@
 struct termios new_tc;
 #endif
 
-typedef	void (*set_handler_t) P((int));
+typedef	void (*set_handler_t) P((char *));
 struct setlist {
     const char *name;				/* name */
     const char *help;				/* help information */
@@ -857,7 +857,7 @@
 #endif
     { "escape",	"character to escape back to telnet command mode", 0, &escape },
     { "rlogin", "rlogin escape character", 0, &rlogin },
-    { "tracefile", "file to write trace information to", (set_handler_t)SetNetTrace, (cc_t *)NetTraceFile},
+    { "tracefile", "file to write trace information to", SetNetTrace, (cc_t *)NetTraceFile},
     { " ", "", 0, NULL },
     { " ", "The following need 'localchars' to be toggled true", 0, 0 },
     { "flushoutput", "character to cause an Abort Output", 0, &termFlushChar },
diff -ur netkit-telnet-0.17.orig/telnetd/telnetd.c netkit-telnet-0.17/telnetd/telnetd.c
--- netkit-telnet-0.17.orig/telnetd/telnetd.c	2023-12-21 12:28:51.149313860 +0100
+++ netkit-telnet-0.17/telnetd/telnetd.c	2023-12-21 12:29:51.396695540 +0100
@@ -385,7 +385,7 @@
 	}
 #endif	/* defined(HAS_IPPROTO_IP) && defined(IP_TOS) */
 	net = s;
-	doit(&from, fromlen);
+	doit((struct sockaddr *) &from, fromlen);
 	/* NOTREACHED */
 	return 0;
 }  /* end of main */