lib/lwres/lwres_gabn.c

	lwres_gabn.c revision 0974e30e2068a662b08326361fe64946fe8603ad
/*
 * Copyright (C) 2000  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.
 */

#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"

int
lwres_gabnrequest_render(lwres_context_t *ctx, lwres_gabnrequest_t *req,
             lwres_lwpacket_t *pkt, lwres_buffer_t *b)
{
    unsigned char *buf;
    size_t buflen;
    int ret;
    size_t payload_length;
    isc_uint16_t datalen;

    REQUIRE(ctx != NULL);
    REQUIRE(req != NULL);
    REQUIRE(req->name != NULL);
    REQUIRE(pkt != NULL);
    REQUIRE(b != NULL);

    datalen = strlen(req->name);

    payload_length = 2 + req->namelen + 1 + 4;

    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->flags &= ~LWRES_LWPACKETFLAG_RESPONSE;
    pkt->opcode = LWRES_OPCODE_GETADDRSBYNAME;
    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));

    /*
     * Address types we'll accept.
     */
    lwres_buffer_putuint32(b, req->addrtypes);

    /*
     * Put the length and the data.  We know this will fit because we
     * just checked for it.
     */
    lwres_buffer_putuint16(b, datalen);
    lwres_buffer_putmem(b, req->name, datalen + 1); /* trailing NUL */

    INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);

    return (LWRES_R_SUCCESS);
}

int
lwres_gabnresponse_render(lwres_context_t *ctx, lwres_gabnresponse_t *req,
              lwres_lwpacket_t *pkt, lwres_buffer_t *b)
{
    unsigned char *buf;
    size_t buflen;
    int ret;
    size_t payload_length;
    isc_uint16_t datalen;
    int x;

    REQUIRE(ctx != NULL);
    REQUIRE(req != NULL);
    REQUIRE(pkt != NULL);
    REQUIRE(b != NULL);

    /* naliases, naddrs */
    payload_length = sizeof(isc_uint16_t) * 2;
    /* real name encoding */
    payload_length += 2 + req->realnamelen + 1;
    /* each alias */
    for (x = 0 ; x < req->naliases ; x++)
        payload_length += 2 + req->aliaslen[x] + 1;
    /* each address */
    for (x = 0 ; x < req->naddrs ; x++) {
        payload_length += sizeof(isc_uint32_t) + sizeof(isc_uint16_t);
        payload_length += req->addrs[x].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->flags |= LWRES_LWPACKETFLAG_RESPONSE;
    pkt->opcode = LWRES_OPCODE_GETADDRSBYNAME;
    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);
    }

    /* encode naliases and naddrs */

    INSIST(SPACE_OK(b, sizeof(isc_uint16_t) * 2));
    lwres_buffer_putuint16(b, req->naliases);
    lwres_buffer_putuint16(b, req->naddrs);

    /* encode the real name */
    datalen = req->realnamelen;
    INSIST(SPACE_OK(b, (unsigned int)(datalen + 2 + 1)));
    lwres_buffer_putuint16(b, datalen);
    lwres_buffer_putmem(b, req->realname, datalen + 1);

    /* encode the aliases */
    for (x = 0 ; x < req->naliases ; x++) {
        datalen = req->aliaslen[x];
        INSIST(SPACE_OK(b, (unsigned int)(datalen + 2 + 1)));
        lwres_buffer_putuint16(b, datalen);
        lwres_buffer_putmem(b, req->aliases[x], datalen + 1);
    }

    /* encode the addresses */
    for (x = 0 ; x < req->naddrs ; x++) {
        datalen = req->addrs[x].length + sizeof(isc_uint16_t)
            + sizeof(isc_uint32_t);
        INSIST(SPACE_OK(b, datalen));
        lwres_buffer_putuint32(b, req->addrs[x].family);
        lwres_buffer_putuint16(b, req->addrs[x].length);
        lwres_buffer_putmem(b, req->addrs[x].address,
                    req->addrs[x].length);
    }

    INSIST(LWRES_BUFFER_AVAILABLECOUNT(b) == 0);

    return (LWRES_R_SUCCESS);
}

int
lwres_gabnrequest_parse(lwres_context_t *ctx, lwres_buffer_t *b,
            lwres_lwpacket_t *pkt, lwres_gabnrequest_t **structp)
{
    int ret;
    char *name;
    lwres_gabnrequest_t *gabn;
    isc_uint32_t addrtypes;
    isc_uint16_t namelen;

    REQUIRE(ctx != NULL);
    REQUIRE(pkt != NULL);
    REQUIRE(b != NULL);
    REQUIRE(structp != NULL && *structp == NULL);

    if ((pkt->flags & LWRES_LWPACKETFLAG_RESPONSE) != 0)
        return (LWRES_R_FAILURE);

    if (!SPACE_REMAINING(b, 4))
        return (LWRES_R_UNEXPECTEDEND);

    addrtypes = lwres_buffer_getuint32(b);

    /*
     * Pull off the name itself
     */
    ret = lwres_string_parse(b, &name, &namelen);
    if (ret != LWRES_R_SUCCESS)
        return (ret);

    if (LWRES_BUFFER_REMAINING(b) != 0)
        return (LWRES_R_UNEXPECTEDEND);

    gabn = CTXMALLOC(sizeof(lwres_gabnrequest_t));
    if (gabn == NULL)
        return (LWRES_R_NOMEMORY);

    gabn->addrtypes = addrtypes;
    gabn->name = name;
    gabn->namelen = namelen;

    *structp = gabn;
    return (LWRES_R_SUCCESS);
}

int
lwres_gabnresponse_parse(lwres_context_t *ctx, lwres_buffer_t *b,
            lwres_lwpacket_t *pkt, lwres_gabnresponse_t **structp)
{
    int ret;
    unsigned int x;
    isc_uint16_t naliases;
    isc_uint16_t naddrs;
    lwres_gabnresponse_t *gabn;

    REQUIRE(ctx != NULL);
    REQUIRE(pkt != NULL);
    REQUIRE(b != NULL);
    REQUIRE(structp != NULL && *structp == NULL);

    gabn = NULL;

    if ((pkt->flags & LWRES_LWPACKETFLAG_RESPONSE) == 0)
        return (LWRES_R_FAILURE);

    /*
     * Pull off the name itself
     */
    if (!SPACE_REMAINING(b, sizeof(isc_uint16_t) * 2))
        return (LWRES_R_UNEXPECTEDEND);
    naliases = lwres_buffer_getuint16(b);
    naddrs = lwres_buffer_getuint16(b);

    gabn = CTXMALLOC(sizeof(lwres_gabnresponse_t));
    if (gabn == NULL)
        return (LWRES_R_NOMEMORY);
    gabn->aliases = NULL;
    gabn->aliaslen = NULL;
    gabn->addrs = NULL;
    gabn->base = NULL;

    gabn->naliases = naliases;
    gabn->naddrs = naddrs;

    gabn->aliases = CTXMALLOC(sizeof(char *) * naliases);
    if (gabn->aliases == NULL) {
        ret = LWRES_R_NOMEMORY;
        goto out;
    }

    gabn->aliaslen = CTXMALLOC(sizeof(isc_uint16_t) * naliases);
    if (gabn->aliaslen == NULL) {
        ret = LWRES_R_NOMEMORY;
        goto out;
    }

    gabn->addrs = CTXMALLOC(sizeof(lwres_addr_t) * naddrs);
    if (gabn->addrs == NULL) {
        ret = LWRES_R_NOMEMORY;
        goto out;
    }

    /*
     * Now, pull off the real name.
     */
    ret = lwres_string_parse(b, &gabn->realname, &gabn->realnamelen);
    if (ret != LWRES_R_SUCCESS)
        goto out;

    /*
     * Pull off the addresses.
     */
    for (x = 0 ; x < gabn->naddrs ; x++) {
        ret = lwres_addr_parse(b, &gabn->addrs[x]);
        if (ret != LWRES_R_SUCCESS)
            goto out;
    }

    /*
     * Parse off the aliases.
     */
    for (x = 0 ; x < gabn->naliases ; x++) {
        ret = lwres_string_parse(b, &gabn->aliases[x],
                     &gabn->aliaslen[x]);
        if (ret != LWRES_R_SUCCESS)
            goto out;
    }

    if (LWRES_BUFFER_REMAINING(b) != 0) {
        ret = LWRES_R_UNEXPECTEDEND;
        goto out;
    }

    *structp = gabn;
    return (LWRES_R_SUCCESS);

 out:
    if (gabn != NULL) {
        if (gabn->aliases != NULL)
            CTXFREE(gabn->aliases, sizeof(char *) * naliases);
        if (gabn->aliaslen != NULL)
            CTXFREE(gabn->aliaslen,
                sizeof(isc_uint16_t) * naliases);
        if (gabn->addrs != NULL)
            CTXFREE(gabn->addrs, sizeof(lwres_addr_t) * naddrs);
        CTXFREE(gabn, sizeof(lwres_gabnresponse_t));
    }

    return (ret);
}

void
lwres_gabnrequest_free(lwres_context_t *ctx, lwres_gabnrequest_t **structp)
{
    lwres_gabnrequest_t *gabn;

    REQUIRE(ctx != NULL);
    REQUIRE(structp != NULL && *structp != NULL);

    gabn = *structp;
    *structp = NULL;

    CTXFREE(gabn, sizeof(lwres_gabnrequest_t));
}

void
lwres_gabnresponse_free(lwres_context_t *ctx, lwres_gabnresponse_t **structp)
{
    lwres_gabnresponse_t *gabn;

    REQUIRE(ctx != NULL);
    REQUIRE(structp != NULL && *structp != NULL);

    gabn = *structp;
    *structp = NULL;

    if (gabn->naliases > 0) {
        CTXFREE(gabn->aliases, sizeof(char *) * gabn->naliases);
        CTXFREE(gabn->aliaslen, sizeof(isc_uint16_t) * gabn->naliases);
    }
    if (gabn->naddrs > 0)
        CTXFREE(gabn->addrs, sizeof(lwres_addr_t *) * gabn->naddrs);
    if (gabn->base != NULL)
        CTXFREE(gabn->base, gabn->baselen);
    CTXFREE(gabn, sizeof(lwres_gabnresponse_t));
}