lwdgabn.c revision d7201de09b85929a86b157f4b2d91667c68c6b52
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * Copyright (C) 2000, 2001 Internet Software Consortium.
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * Permission to use, copy, modify, and/or distribute this software for any
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * purpose with or without fee is hereby granted, provided that the above
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * copyright notice and this permission notice appear in all copies.
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * PERFORMANCE OF THIS SOFTWARE.
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff/* $Id: lwdgabn.c,v 1.24 2009/09/02 23:48:01 tbox Exp $ */
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff#include <isc/string.h> /* Required for HP/UX (and others?) */
29f28fe573d4b3b318b3b026d567c1eb86738015Michael Graff#define NEED_V4(c) ((((c)->find_wanted & LWRES_ADDRTYPE_V4) != 0) \
11efdeb076d65fa9f0c5fc067dc040e7c99dfba6Michael Graff#define NEED_V6(c) ((((c)->find_wanted & LWRES_ADDRTYPE_V6) != 0) \
e51511aa3281f8dc384eb1283115c7f8d5c402aeMichael Graffstatic isc_result_t start_find(ns_lwdclient_t *);
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff * Destroy any finds. This can be used to "start over from scratch" and
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * should only be called when events are _not_ being generated by the finds.
1c3bc66ada38236cc81c41b7174a9f0a872c9ab6Michael Graff ns_lwdclient_log(50, "cleaning up client %p", client);
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graffsetup_addresses(ns_lwdclient_t *client, dns_adbfind_t *find, unsigned int at) {
213973a334f92d4aef4ef62b4538fc2e4d0e8082Michael Graff while (ai != NULL && client->gabn.naddrs < LWRES_MAX_ADDRS) {
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff result = lwaddr_lwresaddr_fromsockaddr(addr, &ai->sockaddr);
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff ns_lwdclient_log(50, "adding address %p, family %d, length %d",
11efdeb076d65fa9f0c5fc067dc040e7c99dfba6Michael Graff LWRES_LIST_APPEND(client->gabn.addrs, addr, link);
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Grafftypedef struct {
2992344aacdb08e4af936c176d49ef789f5673ddMichael Graff const rankedaddress *a = (const rankedaddress *) av;
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff const rankedaddress *b = (const rankedaddress *) bv;
213973a334f92d4aef4ef62b4538fc2e4d0e8082Michael Graff unsigned int naddrs;
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff const void *arg;
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff ns_lwresd_t *lwresd = client->clientmgr->listener->manager;
213973a334f92d4aef4ef62b4538fc2e4d0e8082Michael Graff unsigned int i;
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff if (naddrs <= 1 || lwresd->view->sortlist == NULL)
1c3bc66ada38236cc81c41b7174a9f0a872c9ab6Michael Graff addrs = isc_mem_get(lwresd->mctx, sizeof(rankedaddress) * naddrs);
1c3bc66ada38236cc81c41b7174a9f0a872c9ab6Michael Graff isc_netaddr_fromsockaddr(&remote, &client->address);
1c3bc66ada38236cc81c41b7174a9f0a872c9ab6Michael Graff ns_sortlist_byaddrsetup(lwresd->view->sortlist,
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff for (i = 0; i < naddrs; i++) {
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff result = lwaddr_netaddr_fromlwresaddr(&addrs[i].address,
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff addrs[i].rank = (*order)(&addrs[i].address, arg);
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff qsort(addrs, naddrs, sizeof(rankedaddress), addr_compare);
bb143613cf26e0f27dfd9caf1a7336065d064b26Michael Graff for (i = 0; i < naddrs; i++) {
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff result = lwaddr_lwresaddr_fromnetaddr(&client->addrs[i],
bb143613cf26e0f27dfd9caf1a7336065d064b26Michael Graff isc_mem_put(lwresd->mctx, addrs, sizeof(rankedaddress) * naddrs);
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff ns_lwdclient_log(50, "generating gabn reply for client %p", client);
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff * We must make certain the client->find is not still active.
d43c2cc7bc4022701f141e299ea8f3fb1d0640c2Michael Graff * If it is either the v4 or v6 answer, just set it to NULL and
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff * let the cleanup code destroy it. Otherwise, destroy it now.
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff if (client->find == client->v4find || client->find == client->v6find)
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff * perhaps there are some here?
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff if (NEED_V6(client) && client->v4find != NULL)
d43c2cc7bc4022701f141e299ea8f3fb1d0640c2Michael Graff * Run through the finds we have and wire them up to the gabn
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff setup_addresses(client, client->v4find, DNS_ADBFIND_INET);
66bd3b3c6b171271c705b897823dcdcf29464698Michael Graff setup_addresses(client, client->v6find, DNS_ADBFIND_INET6);
ad3a5c4b7e21af04d1b872f933c2e19e5c0a135bMichael Graff * If there are no addresses, try the next element in the search
439c0011e642fb1d26011116144af698125262dbMichael Graff * path, if there are any more. Otherwise, fall through into
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff * the error handling code below.
11fcc67616fac1bc6a28b3d4fed24641137888e7Michael Graff result = ns_lwsearchctx_next(&client->searchctx);
439c0011e642fb1d26011116144af698125262dbMichael Graff * Render the packet.
439c0011e642fb1d26011116144af698125262dbMichael Graff * If there are no addresses, return failure.
439c0011e642fb1d26011116144af698125262dbMichael Graff lwres = lwres_gabnresponse_render(cm->lwctx, &client->gabn,
651228967966ba4fb2e52f92d1207c790af4b130Michael Graff lwres_context_freemem(client->clientmgr->lwctx,
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff * Take the current real name, move it to an alias slot (if any are
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * open) then put this new name in as the real name for the target.
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff * Return success if it can be rendered, otherwise failure. Note that
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * not having enough alias slots open is NOT a failure.
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * Render the new name to the buffer.
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff result = dns_name_totext(dns_fixedname_name(&client->target_name),
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * Are there any open slots?
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff client->gabn.aliases[naliases] = client->gabn.realname;
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff client->gabn.aliaslen[naliases] = client->gabn.realnamelen;
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * Save this name away as the current real name.
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff client->gabn.realname = (char *)(b.base) + b.used;
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff client->gabn.realnamelen = client->recv_buffer.used - b.used;
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff tname = dns_fixedname_name(&client->target_name);
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff result = ns_lwsearchctx_current(&client->searchctx, tname);
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * Render the new name to the buffer.
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff result = dns_name_totext(tname, ISC_TRUE, &client->recv_buffer);
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * Save this name away as the current real name.
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff client->gabn.realname = (char *) b.base + b.used;
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff client->gabn.realnamelen = client->recv_buffer.used - b.used;
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graffprocess_gabn_finddone(isc_task_t *task, isc_event_t *ev) {
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff ns_lwdclient_log(50, "find done for task %p, client %p", task, client);
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * No more info to be had? If so, we have all the good stuff
2bcb48cfcae36398454c98e40c563e2cde748e07Michael Graff * right now, so we can render things.
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * We probably don't need this find anymore. We're either going to
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * reissue it, or an error occurred. Either way, we're done with
1c3bc66ada38236cc81c41b7174a9f0a872c9ab6Michael Graff * We have some new information we can gather. Run off and fetch
7ec42e4be45c0486ce80461293f377fb4b904dc0Michael Graff * An error or other strangeness happened. Drop this query.
7ec42e4be45c0486ce80461293f377fb4b904dc0Michael Graff ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff unsigned int options;
7ec42e4be45c0486ce80461293f377fb4b904dc0Michael Graff ns_lwdclient_log(50, "starting find for client %p", client);
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * Issue a find for the name contained in the request. We won't
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * set the bit that says "anything is good enough" -- we want it
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * Set the bits up here to mark that we want this address family
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * and that we do not currently have a find pending. We will
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * set that bit again below if it turns out we will get an event.
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff result = dns_adb_createfind(client->clientmgr->view->adb,
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * Did we get an alias? If so, save it and re-issue the query.
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff ns_lwdclient_log(50, "found alias, restarting query");
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff "out of buffer space adding alias");
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff ns_lwdclient_log(50, "find returned %d (%s)", result,
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * Did we get an error?
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * Did we get our answer to V4 addresses?
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff && ((client->find->query_pending & DNS_ADBFIND_INET) == 0)) {
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff ns_lwdclient_log(50, "client %p ipv4 satisfied by find %p",
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * Did we get our answer to V6 addresses?
a385f150bb21b8b81f70ed7df545357a83f1da82Michael Graff && ((client->find->query_pending & DNS_ADBFIND_INET6) == 0)) {
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff ns_lwdclient_log(50, "client %p ipv6 satisfied by find %p",
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * If we're going to get an event, set our internal pending flag
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * and return. When we get an event back we'll do the right
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * thing, basically by calling this function again, perhaps with a
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * new target name.
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * If we have both v4 and v6, and we are still getting an event,
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff * we have a programming error, so die hard.
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff if ((client->find->options & DNS_ADBFIND_WANTEVENT) != 0) {
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff INSIST(client->v4find == NULL || client->v6find == NULL);
d43c2cc7bc4022701f141e299ea8f3fb1d0640c2Michael Graff ns_lwdclient_log(50, "no event will be sent");
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * We seem to have everything we asked for, or at least we are
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * able to respond with things we've learned.
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * Initialize the real name and alias arrays in the reply we're
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * going to build up.
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * Initialize the real name and alias arrays in the reply we're
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * going to build up.
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff for (i = 0; i < LWRES_MAX_ALIASES; i++) {
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff for (i = 0; i < LWRES_MAX_ADDRS; i++) {
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff memset(client->addrs[i].address, 0, LWRES_ADDR_MAXLEN);
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * Set up the internal buffer to point to the receive region.
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff isc_buffer_init(&client->recv_buffer, client->buffer, LWRES_RECVLENGTH);
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * When we are called, we can be assured that:
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * client->sockaddr contains the address we need to reply to,
ff9bb3fc5453bbf310b67c560fbf04a5c0fb60daMichael Graff * client->pkt contains the packet header data,
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * the packet "checks out" overall -- any MD5 hashes or crypto
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * bits have been verified,
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * "b" points to the remaining data after the packet header
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff * was parsed off.
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * We are in a the RECVDONE state.
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * From this state we will enter the SEND state if we happen to have
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * everything we need or we need to return an error packet, or to the
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * FINDWAIT state if we need to look things up.
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graffns_lwdclient_processgabn(ns_lwdclient_t *client, lwres_buffer_t *b) {
f181f94ec8da8b1dbcc6353e8be965ea4a5ea282Michael Graff result = lwres_gabnrequest_parse(client->clientmgr->lwctx,
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff isc_buffer_init(&namebuf, req->name, req->namelen);
30251e07d1705d1a85b0e1d5a969496e1aed612eMichael Graff result = dns_name_fromtext(dns_fixedname_name(&client->query_name),
c803787146cadcb2d7e10cbf4491f3be513dfa1aMichael Graff ns_lwdclient_log(50, "client %p looking for addrtypes %08x",
897c9ddb4d745b2bfecf98b17e5487bb6656299aMichael Graff * We no longer need to keep this around.
2a0b8796d46265c078ba7f4dea2979c62ebf5badBob Halley lwres_gabnrequest_free(client->clientmgr->lwctx, &req);
2a0b8796d46265c078ba7f4dea2979c62ebf5badBob Halley * Start the find.
a253e35c2451818fb39f9b808c7641adb5275fb3Michael Graff * We're screwed. Return an error packet to our caller.
a385f150bb21b8b81f70ed7df545357a83f1da82Michael Graff lwres_gabnrequest_free(client->clientmgr->lwctx, &req);