17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * lib/krb5/os/read_msg.c
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * Copyright 1991 by the Massachusetts Institute of Technology.
57c478bd9Sstevel@tonic-gate  * All Rights Reserved.
67c478bd9Sstevel@tonic-gate  *
77c478bd9Sstevel@tonic-gate  * Export of this software from the United States of America may
87c478bd9Sstevel@tonic-gate  *   require a specific license from the United States Government.
97c478bd9Sstevel@tonic-gate  *   It is the responsibility of any person or organization contemplating
107c478bd9Sstevel@tonic-gate  *   export to obtain such a license before exporting.
11*55fea89dSDan Cross  *
127c478bd9Sstevel@tonic-gate  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
137c478bd9Sstevel@tonic-gate  * distribute this software and its documentation for any purpose and
147c478bd9Sstevel@tonic-gate  * without fee is hereby granted, provided that the above copyright
157c478bd9Sstevel@tonic-gate  * notice appear in all copies and that both that copyright notice and
167c478bd9Sstevel@tonic-gate  * this permission notice appear in supporting documentation, and that
177c478bd9Sstevel@tonic-gate  * the name of M.I.T. not be used in advertising or publicity pertaining
187c478bd9Sstevel@tonic-gate  * to distribution of the software without specific, written prior
19159d09a2SMark Phalan  * permission.  Furthermore if you modify this software you must label
20159d09a2SMark Phalan  * your software as modified software and not distribute it in such a
21159d09a2SMark Phalan  * fashion that it might be confused with the original M.I.T. software.
22159d09a2SMark Phalan  * M.I.T. makes no representations about the suitability of
237c478bd9Sstevel@tonic-gate  * this software for any purpose.  It is provided "as is" without express
247c478bd9Sstevel@tonic-gate  * or implied warranty.
25*55fea89dSDan Cross  *
267c478bd9Sstevel@tonic-gate  *
277c478bd9Sstevel@tonic-gate  * Write a message to the network
287c478bd9Sstevel@tonic-gate  */
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate #include "k5-int.h"
317c478bd9Sstevel@tonic-gate #include <errno.h>
327c478bd9Sstevel@tonic-gate 
337c478bd9Sstevel@tonic-gate krb5_error_code
krb5_read_message(krb5_context context,krb5_pointer fdp,krb5_data * inbuf)34505d05c7Sgtb krb5_read_message(krb5_context context, krb5_pointer fdp, krb5_data *inbuf)
357c478bd9Sstevel@tonic-gate {
367c478bd9Sstevel@tonic-gate 	krb5_int32	len;
37159d09a2SMark Phalan 	int		len2, ilen;
387c478bd9Sstevel@tonic-gate 	char		*buf = NULL;
397c478bd9Sstevel@tonic-gate 	int		fd = *( (int *) fdp);
40*55fea89dSDan Cross 
417c478bd9Sstevel@tonic-gate 	if ((len2 = krb5_net_read(context, fd, (char *)&len, 4)) != 4)
427c478bd9Sstevel@tonic-gate 		return((len2 < 0) ? errno : ECONNABORTED);
437c478bd9Sstevel@tonic-gate 	len = ntohl(len);
447c478bd9Sstevel@tonic-gate 
45159d09a2SMark Phalan 	if ((len & VALID_UINT_BITS) != len)  /* Overflow size_t??? */
46159d09a2SMark Phalan 		return ENOMEM;
477c478bd9Sstevel@tonic-gate 
487c478bd9Sstevel@tonic-gate 	inbuf->length = ilen = (int) len;
497c478bd9Sstevel@tonic-gate 	if (ilen) {
507c478bd9Sstevel@tonic-gate 		/*
517c478bd9Sstevel@tonic-gate 		 * We may want to include a sanity check here someday....
527c478bd9Sstevel@tonic-gate 		 */
53159d09a2SMark Phalan 		if (!(buf = malloc(inbuf->length))) {
547c478bd9Sstevel@tonic-gate 			return(ENOMEM);
557c478bd9Sstevel@tonic-gate 		}
567c478bd9Sstevel@tonic-gate 		if ((len2 = krb5_net_read(context, fd, buf, ilen)) != ilen) {
577c478bd9Sstevel@tonic-gate 			krb5_xfree(buf);
587c478bd9Sstevel@tonic-gate 			return((len2 < 0) ? errno : ECONNABORTED);
597c478bd9Sstevel@tonic-gate 		}
607c478bd9Sstevel@tonic-gate 	}
617c478bd9Sstevel@tonic-gate 	inbuf->data = buf;
627c478bd9Sstevel@tonic-gate 	return(0);
637c478bd9Sstevel@tonic-gate }
64