rwhod(8): Prevent clobbering the neighboring field by a wrong cast.

The time stamps in the rwhod(8) network datagram and, based on that,
/var/rwho/whod.* spool files are typed as 32bit int and cannot accept
a 64bit time_t.

The old code clobbered the first bytes of the adjacent "hostname"
field, yielding empty hostnames in local rwho(1) and ruptime(1) output.
(Outgoing datagrams to other hosts were not affected.)

Re-code to let the compiler do the proper coercion (well, until 2038).

Submitted-by:  Martin Neitzel
Dragonfly-bug: <https://bugs.dragonflybsd.org/issues/2339>

diff --git a/usr.sbin/rwhod/rwhod.c b/usr.sbin/rwhod/rwhod.c
index fda528a..32f86f1 100644 (file)
--- a/usr.sbin/rwhod/rwhod.c
+++ b/usr.sbin/rwhod/rwhod.c
@@ -382,7 +382,7 @@ handleread(int sock)
                }
        }
 #endif
-       time((time_t *)&wd.wd_recvtime);
+       wd.wd_recvtime = time(NULL);
        write(whod, (char *)&wd, cc);
        if (fstat(whod, &st) < 0 || st.st_size > cc)
                ftruncate(whod, cc);