contrib/bind-9.5.2/bin/named/lwdgnba.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2008  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000-2002  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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: lwdgnba.c,v 1.20.130.2 2008/01/14 23:46:28 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <isc/socket.h>
  25 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  26 #include <isc/util.h>
  27
  28 #include <dns/adb.h>
  29 #include <dns/byaddr.h>
  30 #include <dns/result.h>
  31
  32 #include <named/types.h>
  33 #include <named/lwdclient.h>
  34
  35 static void start_byaddr(ns_lwdclient_t *);
  36
  37 static void
  38 byaddr_done(isc_task_t *task, isc_event_t *event) {
  39         ns_lwdclient_t *client;
  40         ns_lwdclientmgr_t *cm;
  41         dns_byaddrevent_t *bevent;
  42         int lwres;
  43         lwres_buffer_t lwb;
  44         dns_name_t *name;
  45         isc_result_t result;
  46         lwres_result_t lwresult;
  47         isc_region_t r;
  48         isc_buffer_t b;
  49         lwres_gnbaresponse_t *gnba;
  50         isc_uint16_t naliases;
  51
  52         UNUSED(task);
  53
  54         lwb.base = NULL;
  55         client = event->ev_arg;
  56         cm = client->clientmgr;
  57         INSIST(client->byaddr == (dns_byaddr_t *)event->ev_sender);
  58
  59         bevent = (dns_byaddrevent_t *)event;
  60         gnba = &client->gnba;
  61
  62         ns_lwdclient_log(50, "byaddr event result = %s",
  63                          isc_result_totext(bevent->result));
  64
  65         result = bevent->result;
  66         if (result != ISC_R_SUCCESS) {
  67                 dns_byaddr_destroy(&client->byaddr);
  68                 isc_event_free(&event);
  69                 bevent = NULL;
  70
  71                 if (client->na.family != AF_INET6 ||
  72                     (client->options & DNS_BYADDROPT_IPV6INT) != 0) {
  73                         if (result == DNS_R_NCACHENXDOMAIN ||
  74                             result == DNS_R_NCACHENXRRSET ||
  75                             result == DNS_R_NXDOMAIN ||
  76                             result == DNS_R_NXRRSET)
  77                                 lwresult = LWRES_R_NOTFOUND;
  78                         else
  79                                 lwresult = LWRES_R_FAILURE;
  80                         ns_lwdclient_errorpktsend(client, lwresult);
  81                         return;
  82                 }
  83
  84                 /*
  85                  * Fall back to ip6.int reverse if the default ip6.arpa
  86                  * fails.
  87                  */
  88                 client->options |= DNS_BYADDROPT_IPV6INT;
  89
  90                 start_byaddr(client);
  91                 return;
  92         }
  93
  94         for (name = ISC_LIST_HEAD(bevent->names);
  95              name != NULL;
  96              name = ISC_LIST_NEXT(name, link))
  97         {
  98                 b = client->recv_buffer;
  99
 100                 result = dns_name_totext(name, ISC_TRUE, &client->recv_buffer);
 101                 if (result != ISC_R_SUCCESS)
 102                         goto out;
 103                 ns_lwdclient_log(50, "found name '%.*s'",
 104                                  (int)(client->recv_buffer.used - b.used),
 105                                  (char *)(b.base) + b.used);
 106                 if (gnba->realname == NULL) {
 107                         gnba->realname = (char *)(b.base) + b.used;
 108                         gnba->realnamelen = client->recv_buffer.used - b.used;
 109                 } else {
 110                         naliases = gnba->naliases;
 111                         if (naliases >= LWRES_MAX_ALIASES)
 112                                 break;
 113                         gnba->aliases[naliases] = (char *)(b.base) + b.used;
 114                         gnba->aliaslen[naliases] =
 115                                 client->recv_buffer.used - b.used;
 116                         gnba->naliases++;
 117                 }
 118         }
 119
 120         dns_byaddr_destroy(&client->byaddr);
 121         isc_event_free(&event);
 122
 123         /*
 124          * Render the packet.
 125          */
 126         client->pkt.recvlength = LWRES_RECVLENGTH;
 127         client->pkt.authtype = 0; /* XXXMLG */
 128         client->pkt.authlength = 0;
 129         client->pkt.result = LWRES_R_SUCCESS;
 130
 131         lwres = lwres_gnbaresponse_render(cm->lwctx,
 132                                           gnba, &client->pkt, &lwb);
 133         if (lwres != LWRES_R_SUCCESS)
 134                 goto out;
 135
 136         r.base = lwb.base;
 137         r.length = lwb.used;
 138         client->sendbuf = r.base;
 139         client->sendlength = r.length;
 140         result = ns_lwdclient_sendreply(client, &r);
 141         if (result != ISC_R_SUCCESS)
 142                 goto out;
 143
 144         NS_LWDCLIENT_SETSEND(client);
 145
 146         return;
 147
 148  out:
 149         if (client->byaddr != NULL)
 150                 dns_byaddr_destroy(&client->byaddr);
 151         if (lwb.base != NULL)
 152                 lwres_context_freemem(cm->lwctx,
 153                                       lwb.base, lwb.length);
 154
 155         if (event != NULL)
 156                 isc_event_free(&event);
 157 }
 158
 159 static void
 160 start_byaddr(ns_lwdclient_t *client) {
 161         isc_result_t result;
 162         ns_lwdclientmgr_t *cm;
 163
 164         cm = client->clientmgr;
 165
 166         INSIST(client->byaddr == NULL);
 167
 168         result = dns_byaddr_create(cm->mctx, &client->na, cm->view,
 169                                    client->options, cm->task, byaddr_done,
 170                                    client, &client->byaddr);
 171         if (result != ISC_R_SUCCESS) {
 172                 ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
 173                 return;
 174         }
 175 }
 176
 177 static void
 178 init_gnba(ns_lwdclient_t *client) {
 179         int i;
 180
 181         /*
 182          * Initialize the real name and alias arrays in the reply we're
 183          * going to build up.
 184          */
 185         for (i = 0; i < LWRES_MAX_ALIASES; i++) {
 186                 client->aliases[i] = NULL;
 187                 client->aliaslen[i] = 0;
 188         }
 189         for (i = 0; i < LWRES_MAX_ADDRS; i++) {
 190                 client->addrs[i].family = 0;
 191                 client->addrs[i].length = 0;
 192                 memset(client->addrs[i].address, 0, LWRES_ADDR_MAXLEN);
 193                 LWRES_LINK_INIT(&client->addrs[i], link);
 194         }
 195
 196         client->gnba.naliases = 0;
 197         client->gnba.realname = NULL;
 198         client->gnba.aliases = client->aliases;
 199         client->gnba.realnamelen = 0;
 200         client->gnba.aliaslen = client->aliaslen;
 201         client->gnba.base = NULL;
 202         client->gnba.baselen = 0;
 203         isc_buffer_init(&client->recv_buffer, client->buffer, LWRES_RECVLENGTH);
 204 }
 205
 206 void
 207 ns_lwdclient_processgnba(ns_lwdclient_t *client, lwres_buffer_t *b) {
 208         lwres_gnbarequest_t *req;
 209         isc_result_t result;
 210         isc_sockaddr_t sa;
 211         ns_lwdclientmgr_t *cm;
 212
 213         REQUIRE(NS_LWDCLIENT_ISRECVDONE(client));
 214         INSIST(client->byaddr == NULL);
 215
 216         cm = client->clientmgr;
 217         req = NULL;
 218
 219         result = lwres_gnbarequest_parse(cm->lwctx,
 220                                          b, &client->pkt, &req);
 221         if (result != LWRES_R_SUCCESS)
 222                 goto out;
 223
 224         client->options = 0;
 225         if (req->addr.family == LWRES_ADDRTYPE_V4) {
 226                 client->na.family = AF_INET;
 227                 if (req->addr.length != 4)
 228                         goto out;
 229                 memcpy(&client->na.type.in, req->addr.address, 4);
 230         } else if (req->addr.family == LWRES_ADDRTYPE_V6) {
 231                 client->na.family = AF_INET6;
 232                 if (req->addr.length != 16)
 233                         goto out;
 234                 memcpy(&client->na.type.in6, req->addr.address, 16);
 235         } else {
 236                 goto out;
 237         }
 238         isc_sockaddr_fromnetaddr(&sa, &client->na, 53);
 239
 240         ns_lwdclient_log(50, "client %p looking for addrtype %08x",
 241                          client, req->addr.family);
 242
 243         /*
 244          * We no longer need to keep this around.
 245          */
 246         lwres_gnbarequest_free(cm->lwctx, &req);
 247
 248         /*
 249          * Initialize the real name and alias arrays in the reply we're
 250          * going to build up.
 251          */
 252         init_gnba(client);
 253         client->options = 0;
 254
 255         /*
 256          * Start the find.
 257          */
 258         start_byaddr(client);
 259
 260         return;
 261
 262         /*
 263          * We're screwed.  Return an error packet to our caller.
 264          */
 265  out:
 266         if (req != NULL)
 267                 lwres_gnbarequest_free(cm->lwctx, &req);
 268
 269         ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
 270 }