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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/os/write_msg.c
*
* Copyright 1991, 2009 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* convenience sendauth/recvauth functions
*/
#include "k5-int.h"
#include <errno.h>
#include "os-proto.h"
/* Try to write a series of messages with as few write(v) system calls
as possible, to avoid Nagle/DelayedAck problems. Cheating here a
little -- I know the only cases we have at the moment will send one
or two messages in a call. Sending more will work, but not as
efficiently. */
krb5_error_code
krb5int_write_messages(krb5_context context, krb5_pointer fdp, krb5_data *outbuf, int nbufs)
{
int fd = *( (int *) fdp);
while (nbufs) {
int nbufs1;
sg_buf sg[4];
krb5_int32 len[2];
if (nbufs > 1)
nbufs1 = 2;
else
nbufs1 = 1;
len[0] = htonl(outbuf[0].length);
SG_SET(&sg[0], &len[0], 4);
SG_SET(&sg[1], outbuf[0].length ? outbuf[0].data : NULL,
outbuf[0].length);
if (nbufs1 == 2) {
len[1] = htonl(outbuf[1].length);
SG_SET(&sg[2], &len[1], 4);
SG_SET(&sg[3], outbuf[1].length ? outbuf[1].data : NULL,
outbuf[1].length);
}
if (krb5int_net_writev(context, fd, sg, nbufs1 * 2) < 0) {
return errno;
}
outbuf += nbufs1;
nbufs -= nbufs1;
}
return(0);
}
krb5_error_code
krb5_write_message(krb5_context context, krb5_pointer fdp, krb5_data *outbuf)
{
return krb5int_write_messages(context, fdp, outbuf, 1);
}
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