1 /* 2 * lib/krb5/os/read_msg.c 3 * 4 * Copyright 1991 by the Massachusetts Institute of Technology. 5 * All Rights Reserved. 6 * 7 * Export of this software from the United States of America may 8 * require a specific license from the United States Government. 9 * It is the responsibility of any person or organization contemplating 10 * export to obtain such a license before exporting. 11 * 12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 13 * distribute this software and its documentation for any purpose and 14 * without fee is hereby granted, provided that the above copyright 15 * notice appear in all copies and that both that copyright notice and 16 * this permission notice appear in supporting documentation, and that 17 * the name of M.I.T. not be used in advertising or publicity pertaining 18 * to distribution of the software without specific, written prior 19 * permission. Furthermore if you modify this software you must label 20 * your software as modified software and not distribute it in such a 21 * fashion that it might be confused with the original M.I.T. software. 22 * M.I.T. makes no representations about the suitability of 23 * this software for any purpose. It is provided "as is" without express 24 * or implied warranty. 25 * 26 * 27 * Write a message to the network 28 */ 29 30 #include "k5-int.h" 31 #include <errno.h> 32 33 krb5_error_code 34 krb5_read_message(krb5_context context, krb5_pointer fdp, krb5_data *inbuf) 35 { 36 krb5_int32 len; 37 int len2, ilen; 38 char *buf = NULL; 39 int fd = *( (int *) fdp); 40 41 if ((len2 = krb5_net_read(context, fd, (char *)&len, 4)) != 4) 42 return((len2 < 0) ? errno : ECONNABORTED); 43 len = ntohl(len); 44 45 if ((len & VALID_UINT_BITS) != len) /* Overflow size_t??? */ 46 return ENOMEM; 47 48 inbuf->length = ilen = (int) len; 49 if (ilen) { 50 /* 51 * We may want to include a sanity check here someday.... 52 */ 53 if (!(buf = malloc(inbuf->length))) { 54 return(ENOMEM); 55 } 56 if ((len2 = krb5_net_read(context, fd, buf, ilen)) != ilen) { 57 krb5_xfree(buf); 58 return((len2 < 0) ? errno : ECONNABORTED); 59 } 60 } 61 inbuf->data = buf; 62 return(0); 63 } 64