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Reviewed by: David Greenman

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Back out the 'help NIS rebind faster' hack. This change used a
connect()/send() pair rather than the original sendto() to allow
RPC to pass ICMP host unreachable and similar errors up to RPC
programs that use UDP. This is not a terrible thing by itself, but it can
cause trouble in environments with multi-homed hosts: if the portmapper
on the multi-homed machine sends a reply with a source address
that's different than the one associated with the connection by
connect(), the kernel will send a port unreachable message and
drop the reply. For the sake of compatibility with everybody else
on the planet, it's best to revert to the old behavior.

*long, heavy sigh*
This commit is contained in:
Bill Paul 1995-08-02 09:14:23 +00:00
parent b60de1afb0
commit 19f61b3433
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9853
1 changed files with 4 additions and 14 deletions
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18
lib/libc/rpc/clnt_udp.c
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@ -30,7 +30,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$Id: clnt_udp.c,v 1.2 1995/04/02 20:05:20 wpaul Exp $";
static char *rcsid = "$Id: clnt_udp.c,v 1.3 1995/05/30 05:41:19 rgrimes Exp $";
#endif
/*
@ -258,20 +258,10 @@ call_again:
return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
outlen = (int)XDR_GETPOS(xdrs);
/*
* Give error (ECONNREFUSED/EHOSTUNREACH) instead of timeout.
* Gives much faster NIS rebinding.
* Errors are not detected here, but in the recvfrom()
* following the select().
*/
if (connect(cu->cu_sock, (struct sockaddr *)(&cu->cu_raddr),
cu->cu_rlen) != 0) {
cu->cu_error.re_errno = errno;
return (cu->cu_error.re_status = RPC_CANTSEND);
}
send_again:
if (send(cu->cu_sock, cu->cu_outbuf, outlen, 0) != outlen) {
if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
(struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen)
!= outlen) {
cu->cu_error.re_errno = errno;
return (cu->cu_error.re_status = RPC_CANTSEND);
}