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3633. [cleanup] Refactor OPT processing in named to make it easier

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to support new EDNS options. [RT #34414]
This commit is contained in:
Mark Andrews
2013-08-15 12:01:12 +10:00
parent 7ace327795
commit 8e091f3d3e
2 changed files with 96 additions and 128 deletions
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3
CHANGES
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@@ -1,3 +1,6 @@
3633. [cleanup] Refactor OPT processing in named to make it easier
to support new EDNS options. [RT #34414]
3632. [bug] Signature from newly inactive keys were not being
removed. [RT #32178]

221
bin/named/client.c
View File

@@ -1326,62 +1326,30 @@ ns_client_error(ns_client_t *client, isc_result_t result) {
static inline isc_result_t
client_addopt(ns_client_t *client) {
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
char nsid[BUFSIZ], *nsidp;
isc_result_t result;
dns_view_t *view;
dns_resolver_t *resolver;
isc_uint16_t udpsize;
dns_ednsopt_t ednsopts[2];
int count = 0;
unsigned int flags;
REQUIRE(client->opt == NULL); /* XXXRTH free old. */
rdatalist = NULL;
result = dns_message_gettemprdatalist(client->message, &rdatalist);
if (result != ISC_R_SUCCESS)
return (result);
rdata = NULL;
result = dns_message_gettemprdata(client->message, &rdata);
if (result != ISC_R_SUCCESS)
return (result);
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_init(rdataset);
rdatalist->type = dns_rdatatype_opt;
rdatalist->covers = 0;
/*
* Set the maximum UDP buffer size.
*/
view = client->view;
resolver = (view != NULL) ? view->resolver : NULL;
if (resolver != NULL)
udpsize = dns_resolver_getudpsize(resolver);
else
udpsize = ns_g_udpsize;
rdatalist->rdclass = udpsize;
/*
* Set EXTENDED-RCODE, VERSION and Z to 0.
*/
rdatalist->ttl = (client->extflags & DNS_MESSAGEEXTFLAG_REPLYPRESERVE);
flags = client->extflags & DNS_MESSAGEEXTFLAG_REPLYPRESERVE;
/* Set EDNS options if applicable */
if (client->attributes & NS_CLIENTATTR_WANTNSID &&
if ((client->attributes & NS_CLIENTATTR_WANTNSID) != 0 &&
(ns_g_server->server_id != NULL ||
ns_g_server->server_usehostname)) {
/*
* Space required for NSID data:
* 2 bytes for opt code
* + 2 bytes for NSID length
* + NSID itself
*/
char nsid[BUFSIZ], *nsidp;
isc_buffer_t *buffer = NULL;
if (ns_g_server->server_usehostname) {
isc_result_t result;
result = ns_os_gethostname(nsid, sizeof(nsid));
@@ -1392,35 +1360,15 @@ client_addopt(ns_client_t *client) {
} else
nsidp = ns_g_server->server_id;
rdata->length = strlen(nsidp) + 4;
result = isc_buffer_allocate(client->mctx, &buffer,
rdata->length);
if (result != ISC_R_SUCCESS)
goto no_nsid;
isc_buffer_putuint16(buffer, DNS_OPT_NSID);
isc_buffer_putuint16(buffer, strlen(nsidp));
isc_buffer_putstr(buffer, nsidp);
rdata->data = buffer->base;
dns_message_takebuffer(client->message, &buffer);
} else {
no_nsid:
rdata->data = NULL;
rdata->length = 0;
ednsopts[count].code = DNS_OPT_NSID;
ednsopts[count].length = strlen(nsidp);
ednsopts[count].value = (unsigned char *)nsidp;
count++;
}
rdata->rdclass = rdatalist->rdclass;
rdata->type = rdatalist->type;
rdata->flags = 0;
ISC_LIST_INIT(rdatalist->rdata);
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset)
== ISC_R_SUCCESS);
client->opt = rdataset;
return (ISC_R_SUCCESS);
no_nsid:
result = dns_message_buildopt(client->message, &client->opt, 0,
udpsize, flags, ednsopts, count);
return (result);
}
static inline isc_boolean_t
@@ -1501,6 +1449,83 @@ ns_client_isself(dns_view_t *myview, dns_tsigkey_t *mykey,
return (ISC_TF(view == myview));
}
static isc_result_t
process_opt(ns_client_t *client, dns_rdataset_t *opt) {
dns_rdata_t rdata;
isc_buffer_t optbuf;
isc_result_t result;
isc_uint16_t optcode;
isc_uint16_t optlen;
/*
* Set the client's UDP buffer size.
*/
client->udpsize = opt->rdclass;
/*
* If the requested UDP buffer size is less than 512,
* ignore it and use 512.
*/
if (client->udpsize < 512)
client->udpsize = 512;
/*
* Get the flags out of the OPT record.
*/
client->extflags = (isc_uint16_t)(opt->ttl & 0xFFFF);
/*
* Do we understand this version of EDNS?
*
* XXXRTH need library support for this!
*/
client->ednsversion = (opt->ttl & 0x00FF0000) >> 16;
if (client->ednsversion > 0) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_badednsver);
result = client_addopt(client);
if (result == ISC_R_SUCCESS)
result = DNS_R_BADVERS;
ns_client_error(client, result);
goto cleanup;
}
/* Check for NSID request */
result = dns_rdataset_first(opt);
if (result == ISC_R_SUCCESS) {
dns_rdata_init(&rdata);
dns_rdataset_current(opt, &rdata);
isc_buffer_init(&optbuf, rdata.data, rdata.length);
isc_buffer_add(&optbuf, rdata.length);
while (isc_buffer_remaininglength(&optbuf) >= 4) {
optcode = isc_buffer_getuint16(&optbuf);
optlen = isc_buffer_getuint16(&optbuf);
switch (optcode) {
case DNS_OPT_NSID:
client->attributes |= NS_CLIENTATTR_WANTNSID;
isc_buffer_forward(&optbuf, optlen);
break;
default:
isc_buffer_forward(&optbuf, optlen);
break;
}
}
}
isc_stats_increment(ns_g_server->nsstats, dns_nsstatscounter_edns0in);
/*
* Create an OPT for our reply.
*/
result = client_addopt(client);
if (result != ISC_R_SUCCESS) {
ns_client_error(client, result);
goto cleanup;
}
cleanup:
return (result);
}
/*
* Handle an incoming request event from the socket (UDP case)
* or tcpmsg (TCP case).
@@ -1522,8 +1547,6 @@ client_request(isc_task_t *task, isc_event_t *event) {
dns_messageid_t id;
unsigned int flags;
isc_boolean_t notimp;
dns_rdata_t rdata;
isc_uint16_t optcode;
REQUIRE(event != NULL);
client = event->ev_arg;
@@ -1740,67 +1763,9 @@ client_request(isc_task_t *task, isc_event_t *event) {
ns_client_next(client, ISC_R_SUCCESS);
goto cleanup;
}
/*
* Set the client's UDP buffer size.
*/
client->udpsize = opt->rdclass;
/*
* If the requested UDP buffer size is less than 512,
* ignore it and use 512.
*/
if (client->udpsize < 512)
client->udpsize = 512;
/*
* Get the flags out of the OPT record.
*/
client->extflags = (isc_uint16_t)(opt->ttl & 0xFFFF);
/*
* Do we understand this version of EDNS?
*
* XXXRTH need library support for this!
*/
client->ednsversion = (opt->ttl & 0x00FF0000) >> 16;
if (client->ednsversion > 0) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_badednsver);
result = client_addopt(client);
if (result == ISC_R_SUCCESS)
result = DNS_R_BADVERS;
ns_client_error(client, result);
result = process_opt(client, opt);
if (result != ISC_R_SUCCESS)
goto cleanup;
}
/* Check for NSID request */
result = dns_rdataset_first(opt);
if (result == ISC_R_SUCCESS) {
dns_rdata_init(&rdata);
dns_rdataset_current(opt, &rdata);
if (rdata.length >= 2) {
isc_buffer_t nsidbuf;
isc_buffer_init(&nsidbuf,
rdata.data, rdata.length);
isc_buffer_add(&nsidbuf, rdata.length);
optcode = isc_buffer_getuint16(&nsidbuf);
if (optcode == DNS_OPT_NSID)
client->attributes |=
NS_CLIENTATTR_WANTNSID;
}
}
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_edns0in);
/*
* Create an OPT for our reply.
*/
result = client_addopt(client);
if (result != ISC_R_SUCCESS) {
ns_client_error(client, result);
goto cleanup;
}
}
if (client->message->rdclass == 0) {