/contrib/bind9/lib/lwres/lwpacket.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 129 lines · 48 code · 19 blank · 62 comment · 7 complexity · e8d29e05dbe7a03454a5d15492962b6e MD5 · raw file
- /*
- * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
- * Copyright (C) 2000, 2001 Internet Software Consortium.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
- * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
- /* $Id: lwpacket.c,v 1.18 2007/06/19 23:47:22 tbox Exp $ */
- /*! \file */
- /**
- * These functions rely on a struct lwres_lwpacket which is defined in
- * \link lwpacket.h lwres/lwpacket.h.\endlink
- *
- * The following opcodes are currently defined:
- *
- * \li #LWRES_OPCODE_NOOP
- * Success is always returned and the packet contents are
- * echoed. The \link lwres_noop.c lwres_noop_*()\endlink functions should be used for this
- * type.
- *
- * \li #LWRES_OPCODE_GETADDRSBYNAME
- * returns all known addresses for a given name. The
- * \link lwres_gabn.c lwres_gabn_*()\endlink functions should be used for this type.
- *
- * \li #LWRES_OPCODE_GETNAMEBYADDR
- * return the hostname for the given address. The
- * \link lwres_gnba.c lwres_gnba_*() \endlink functions should be used for this type.
- *
- * lwres_lwpacket_renderheader() transfers the contents of lightweight
- * resolver packet structure #lwres_lwpacket_t *pkt in network byte
- * order to the lightweight resolver buffer, *b.
- *
- * lwres_lwpacket_parseheader() performs the converse operation. It
- * transfers data in network byte order from buffer *b to resolver
- * packet *pkt. The contents of the buffer b should correspond to a
- * #lwres_lwpacket_t.
- *
- * \section lwpacket_return Return Values
- *
- * Successful calls to lwres_lwpacket_renderheader() and
- * lwres_lwpacket_parseheader() return #LWRES_R_SUCCESS. If there is
- * insufficient space to copy data between the buffer *b and
- * lightweight resolver packet *pkt both functions return
- * #LWRES_R_UNEXPECTEDEND.
- */
- #include <config.h>
- #include <assert.h>
- #include <stdlib.h>
- #include <string.h>
- #include <lwres/lwbuffer.h>
- #include <lwres/lwpacket.h>
- #include <lwres/result.h>
- #include "assert_p.h"
- /*% Length of Packet */
- #define LWPACKET_LENGTH \
- (sizeof(lwres_uint16_t) * 4 + sizeof(lwres_uint32_t) * 5)
- /*% transfers the contents of lightweight resolver packet structure lwres_lwpacket_t *pkt in network byte order to the lightweight resolver buffer, *b. */
- lwres_result_t
- lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
- REQUIRE(b != NULL);
- REQUIRE(pkt != NULL);
- if (!SPACE_OK(b, LWPACKET_LENGTH))
- return (LWRES_R_UNEXPECTEDEND);
- lwres_buffer_putuint32(b, pkt->length);
- lwres_buffer_putuint16(b, pkt->version);
- lwres_buffer_putuint16(b, pkt->pktflags);
- lwres_buffer_putuint32(b, pkt->serial);
- lwres_buffer_putuint32(b, pkt->opcode);
- lwres_buffer_putuint32(b, pkt->result);
- lwres_buffer_putuint32(b, pkt->recvlength);
- lwres_buffer_putuint16(b, pkt->authtype);
- lwres_buffer_putuint16(b, pkt->authlength);
- return (LWRES_R_SUCCESS);
- }
- /*% transfers data in network byte order from buffer *b to resolver packet *pkt. The contents of the buffer b should correspond to a lwres_lwpacket_t. */
- lwres_result_t
- lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt) {
- lwres_uint32_t space;
- REQUIRE(b != NULL);
- REQUIRE(pkt != NULL);
- space = LWRES_BUFFER_REMAINING(b);
- if (space < LWPACKET_LENGTH)
- return (LWRES_R_UNEXPECTEDEND);
- pkt->length = lwres_buffer_getuint32(b);
- /*
- * XXXBEW/MLG Checking that the buffer is long enough probably
- * shouldn't be done here, since this function is supposed to just
- * parse the header.
- */
- if (pkt->length > space)
- return (LWRES_R_UNEXPECTEDEND);
- pkt->version = lwres_buffer_getuint16(b);
- pkt->pktflags = lwres_buffer_getuint16(b);
- pkt->serial = lwres_buffer_getuint32(b);
- pkt->opcode = lwres_buffer_getuint32(b);
- pkt->result = lwres_buffer_getuint32(b);
- pkt->recvlength = lwres_buffer_getuint32(b);
- pkt->authtype = lwres_buffer_getuint16(b);
- pkt->authlength = lwres_buffer_getuint16(b);
- return (LWRES_R_SUCCESS);
- }