contrib/bind-9.3/lib/lwres/lwpacket.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: lwpacket.c,v 1.13.206.1 2004/03/06 08:15:32 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <lwres/lwbuffer.h>
  27 #include <lwres/lwpacket.h>
  28 #include <lwres/result.h>
  29
  30 #include "assert_p.h"
  31
  32 #define LWPACKET_LENGTH \
  33         (sizeof(lwres_uint16_t) * 4 + sizeof(lwres_uint32_t) * 5)
  34
  35 lwres_result_t
  36 lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
  37         REQUIRE(b != NULL);
  38         REQUIRE(pkt != NULL);
  39
  40         if (!SPACE_OK(b, LWPACKET_LENGTH))
  41                 return (LWRES_R_UNEXPECTEDEND);
  42
  43         lwres_buffer_putuint32(b, pkt->length);
  44         lwres_buffer_putuint16(b, pkt->version);
  45         lwres_buffer_putuint16(b, pkt->pktflags);
  46         lwres_buffer_putuint32(b, pkt->serial);
  47         lwres_buffer_putuint32(b, pkt->opcode);
  48         lwres_buffer_putuint32(b, pkt->result);
  49         lwres_buffer_putuint32(b, pkt->recvlength);
  50         lwres_buffer_putuint16(b, pkt->authtype);
  51         lwres_buffer_putuint16(b, pkt->authlength);
  52
  53         return (LWRES_R_SUCCESS);
  54 }
  55
  56 lwres_result_t
  57 lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
  58         lwres_uint32_t space;
  59
  60         REQUIRE(b != NULL);
  61         REQUIRE(pkt != NULL);
  62
  63         space = LWRES_BUFFER_REMAINING(b);
  64         if (space < LWPACKET_LENGTH)
  65                 return (LWRES_R_UNEXPECTEDEND);
  66
  67         pkt->length = lwres_buffer_getuint32(b);
  68         /*
  69          * XXXBEW/MLG Checking that the buffer is long enough probably
  70          * shouldn't be done here, since this function is supposed to just
  71          * parse the header.
  72          */
  73         if (pkt->length > space)
  74                 return (LWRES_R_UNEXPECTEDEND);
  75         pkt->version = lwres_buffer_getuint16(b);
  76         pkt->pktflags = lwres_buffer_getuint16(b);
  77         pkt->serial = lwres_buffer_getuint32(b);
  78         pkt->opcode = lwres_buffer_getuint32(b);
  79         pkt->result = lwres_buffer_getuint32(b);
  80         pkt->recvlength = lwres_buffer_getuint32(b);
  81         pkt->authtype = lwres_buffer_getuint16(b);
  82         pkt->authlength = lwres_buffer_getuint16(b);
  83
  84         return (LWRES_R_SUCCESS);
  85 }