lwres_gnba.c revision f1b68725503ff3e46001eee5a1751e29a43a09d1
/*
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM 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: lwres_gnba.c,v 1.21 2001/11/27 00:56:30 gson Exp $ */
#include <config.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <lwres/lwbuffer.h>
#include <lwres/lwpacket.h>
#include <lwres/lwres.h>
#include <lwres/result.h>
#include "context_p.h"
#include "assert_p.h"
lwres_result_t
lwres_gnbarequest_render(lwres_context_t *ctx, lwres_gnbarequest_t *req,
lwres_lwpacket_t *pkt, lwres_buffer_t *b)
{
unsigned char *buf;
size_t buflen;
int ret;
size_t payload_length;
REQUIRE(ctx != NULL);
REQUIRE(req != NULL);
REQUIRE(req->addr.family != 0);
REQUIRE(req->addr.length != 0);
REQUIRE(req->addr.address != NULL);
REQUIRE(pkt != NULL);
REQUIRE(b != NULL);
payload_length = 4 + 4 + 2 + + req->addr.length;
buflen = LWRES_LWPACKET_LENGTH + payload_length;
buf = CTXMALLOC(buflen);
if (buf == NULL)
return (LWRES_R_NOMEMORY);
lwres_buffer_init(b, buf, buflen);
pkt->length = buflen;
pkt->version = LWRES_LWPACKETVERSION_0;
pkt->pktflags &= ~LWRES_LWPACKETFLAG_RESPONSE;
pkt->opcode = LWRES_OPCODE_GETNAMEBYADDR;
pkt->result = 0;
pkt->authtype = 0;
pkt->authlength = 0;
ret = lwres_lwpacket_renderheader(b, pkt);
if (ret != LWRES_R_SUCCESS) {
lwres_buffer_invalidate(b);
CTXFREE(buf, buflen);
return (ret);
}
INSIST(SPACE_OK(b, payload_length));
/*
* Put the length and the data. We know this will fit because we
* just checked for it.
*/
lwres_buffer_putuint32(b, req->flags);
lwres_buffer_putuint32(b, req->addr.family);
lwres_buffer_putuint16(b, req->addr.length);
lwres_buffer_putmem(b, (unsigned char *)req->addr.address,
req->addr.length);
INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);
return (LWRES_R_SUCCESS);
}
lwres_result_t
lwres_gnbaresponse_render(lwres_context_t *ctx, lwres_gnbaresponse_t *req,
lwres_lwpacket_t *pkt, lwres_buffer_t *b)
{
unsigned char *buf;
size_t buflen;
int ret;
size_t payload_length;
lwres_uint16_t datalen;
int x;
REQUIRE(ctx != NULL);
REQUIRE(req != NULL);
REQUIRE(pkt != NULL);
REQUIRE(b != NULL);
/*
* Calculate packet size.
*/
payload_length = 4; /* flags */
payload_length += 2; /* naliases */
payload_length += 2 + req->realnamelen + 1; /* real name encoding */
for (x = 0; x < req->naliases; x++) /* each alias */
payload_length += 2 + req->aliaslen[x] + 1;
buflen = LWRES_LWPACKET_LENGTH + payload_length;
buf = CTXMALLOC(buflen);
if (buf == NULL)
return (LWRES_R_NOMEMORY);
lwres_buffer_init(b, buf, buflen);
pkt->length = buflen;
pkt->version = LWRES_LWPACKETVERSION_0;
pkt->pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
pkt->opcode = LWRES_OPCODE_GETNAMEBYADDR;
pkt->authtype = 0;
pkt->authlength = 0;
ret = lwres_lwpacket_renderheader(b, pkt);
if (ret != LWRES_R_SUCCESS) {
lwres_buffer_invalidate(b);
CTXFREE(buf, buflen);
return (ret);
}
INSIST(SPACE_OK(b, payload_length));
lwres_buffer_putuint32(b, req->flags);
/* encode naliases */
lwres_buffer_putuint16(b, req->naliases);
/* encode the real name */
datalen = req->realnamelen;
lwres_buffer_putuint16(b, datalen);
lwres_buffer_putmem(b, (unsigned char *)req->realname, datalen);
lwres_buffer_putuint8(b, 0);
/* encode the aliases */
for (x = 0; x < req->naliases; x++) {
datalen = req->aliaslen[x];
lwres_buffer_putuint16(b, datalen);
lwres_buffer_putmem(b, (unsigned char *)req->aliases[x],
datalen);
lwres_buffer_putuint8(b, 0);
}
INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);
return (LWRES_R_SUCCESS);
}
lwres_result_t
lwres_gnbarequest_parse(lwres_context_t *ctx, lwres_buffer_t *b,
lwres_lwpacket_t *pkt, lwres_gnbarequest_t **structp)
{
int ret;
lwres_gnbarequest_t *gnba;
REQUIRE(ctx != NULL);
REQUIRE(pkt != NULL);
REQUIRE(b != NULL);
REQUIRE(structp != NULL && *structp == NULL);
if ((pkt->pktflags & LWRES_LWPACKETFLAG_RESPONSE) != 0)
return (LWRES_R_FAILURE);
gnba = CTXMALLOC(sizeof(lwres_gnbarequest_t));
if (gnba == NULL)
return (LWRES_R_NOMEMORY);
if (!SPACE_REMAINING(b, 4))
return (LWRES_R_UNEXPECTEDEND);
gnba->flags = lwres_buffer_getuint32(b);
ret = lwres_addr_parse(b, &gnba->addr);
if (ret != LWRES_R_SUCCESS)
goto out;
if (LWRES_BUFFER_REMAINING(b) != 0) {
ret = LWRES_R_TRAILINGDATA;
goto out;
}
*structp = gnba;
return (LWRES_R_SUCCESS);
out:
if (gnba != NULL)
lwres_gnbarequest_free(ctx, &gnba);
return (ret);
}
lwres_result_t
lwres_gnbaresponse_parse(lwres_context_t *ctx, lwres_buffer_t *b,
lwres_lwpacket_t *pkt, lwres_gnbaresponse_t **structp)
{
int ret;
unsigned int x;
lwres_uint32_t flags;
lwres_uint16_t naliases;
lwres_gnbaresponse_t *gnba;
REQUIRE(ctx != NULL);
REQUIRE(pkt != NULL);
REQUIRE(b != NULL);
REQUIRE(structp != NULL && *structp == NULL);
gnba = NULL;
if ((pkt->pktflags & LWRES_LWPACKETFLAG_RESPONSE) == 0)
return (LWRES_R_FAILURE);
/*
* Pull off flags & naliases
*/
if (!SPACE_REMAINING(b, 4 + 2))
return (LWRES_R_UNEXPECTEDEND);
flags = lwres_buffer_getuint32(b);
naliases = lwres_buffer_getuint16(b);
gnba = CTXMALLOC(sizeof(lwres_gnbaresponse_t));
if (gnba == NULL)
return (LWRES_R_NOMEMORY);
gnba->base = NULL;
gnba->aliases = NULL;
gnba->aliaslen = NULL;
gnba->flags = flags;
gnba->naliases = naliases;
if (naliases > 0) {
gnba->aliases = CTXMALLOC(sizeof(char *) * naliases);
if (gnba->aliases == NULL) {
ret = LWRES_R_NOMEMORY;
goto out;
}
gnba->aliaslen = CTXMALLOC(sizeof(lwres_uint16_t) * naliases);
if (gnba->aliaslen == NULL) {
ret = LWRES_R_NOMEMORY;
goto out;
}
}
/*
* Now, pull off the real name.
*/
ret = lwres_string_parse(b, &gnba->realname, &gnba->realnamelen);
if (ret != LWRES_R_SUCCESS)
goto out;
/*
* Parse off the aliases.
*/
for (x = 0; x < gnba->naliases; x++) {
ret = lwres_string_parse(b, &gnba->aliases[x],
&gnba->aliaslen[x]);
if (ret != LWRES_R_SUCCESS)
goto out;
}
if (LWRES_BUFFER_REMAINING(b) != 0) {
ret = LWRES_R_TRAILINGDATA;
goto out;
}
*structp = gnba;
return (LWRES_R_SUCCESS);
out:
if (gnba != NULL) {
if (gnba->aliases != NULL)
CTXFREE(gnba->aliases, sizeof(char *) * naliases);
if (gnba->aliaslen != NULL)
CTXFREE(gnba->aliaslen,
sizeof(lwres_uint16_t) * naliases);
CTXFREE(gnba, sizeof(lwres_gnbaresponse_t));
}
return (ret);
}
void
lwres_gnbarequest_free(lwres_context_t *ctx, lwres_gnbarequest_t **structp)
{
lwres_gnbarequest_t *gnba;
REQUIRE(ctx != NULL);
REQUIRE(structp != NULL && *structp != NULL);
gnba = *structp;
*structp = NULL;
CTXFREE(gnba, sizeof(lwres_gnbarequest_t));
}
void
lwres_gnbaresponse_free(lwres_context_t *ctx, lwres_gnbaresponse_t **structp)
{
lwres_gnbaresponse_t *gnba;
REQUIRE(ctx != NULL);
REQUIRE(structp != NULL && *structp != NULL);
gnba = *structp;
*structp = NULL;
if (gnba->naliases > 0) {
CTXFREE(gnba->aliases, sizeof(char *) * gnba->naliases);
CTXFREE(gnba->aliaslen,
sizeof(lwres_uint16_t) * gnba->naliases);
}
if (gnba->base != NULL)
CTXFREE(gnba->base, gnba->baselen);
CTXFREE(gnba, sizeof(lwres_gnbaresponse_t));
}