diff --git a/client/dhclient.8 b/client/dhclient.8
index a29757a..c66a912 100644
--- a/client/dhclient.8
+++ b/client/dhclient.8
@@ -56,6 +56,12 @@ dhclient - Dynamic Host Configuration Protocol Client
]
]
[
+.B -i
+]
+[
+.B -C
+]
+[
.B -D
.I LL|LLT
]
@@ -441,6 +447,17 @@ Set the giaddr field of all packets to the \fIrelay\fR IP address
simulating a relay agent. This is for testing pruposes only and
should not be expected to work in any consistent or useful way.
.TP
+.BI \-i
+Use a DUID with DHCPv4 clients. If no DUID is available in the
+lease file one will be constructed and saved. The DUID will be
+used to contstuct a RFC4361 style client id that will be included
+in the client's messages. This client id can be overridden by
+setting a client id in the configuration file. Overridding the
+client id in this fashion is discouraged.
+.TP
+.BI \-C
+Use the standard DDNS scheme from RFCs 4701 & 4702.
+.TP
.BI \--version
Print version number and exit.
.PP
@@ -470,8 +487,10 @@ DHCPv6 \fBdhclient\fR creates an identifier based on the link-layer address
(DUID-LL) if it is running in stateless mode (with \fB\-S\fR, not
requesting an address), or it creates an identifier based on the
link-layer address plus a timestamp (DUID-LLT) if it is running in
-stateful mode (without \fB\-S\fR, requesting an address). \fB\-D\fR
-overrides this default, with a value of either \fILL\fR or \fILLT\fR.
+stateful mode (without \fB\-S\fR, requesting an address). When DHCPv4
+is configued to use a DUID using \fB\-i\fR option the default is to use
+a DUID-LLT. \fB\-D\fR
+overrides these default, with a value of either \fILL\fR or \fILLT\fR.
.TP
.BI \-N
.\" TODO: is this for telling an already running dhclient?
diff --git a/client/dhclient.c b/client/dhclient.c
index 0db4703..6403754 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -79,6 +79,8 @@ struct sockaddr_in sockaddr_broadcast;
struct in_addr giaddr;
struct data_string default_duid;
int duid_type = 0;
+int duid_v4 = 0;
+int std_dhcid = 0;
/* ASSERT_STATE() does nothing now; it used to be
assert (state_is == state_shouldbe). */
@@ -325,12 +327,9 @@ main(int argc, char **argv) {
wanted_ia_na = 0;
}
wanted_ia_pd++;
+#endif /* DHCPv6 */
} else if (!strcmp(argv[i], "-D")) {
- if (local_family_set && (local_family == AF_INET)) {
- usage();
- }
- local_family_set = 1;
- local_family = AF_INET6;
+ duid_v4 = 1;
if (++i == argc)
usage();
if (!strcasecmp(argv[i], "LL")) {
@@ -340,7 +339,12 @@ main(int argc, char **argv) {
} else {
usage();
}
-#endif /* DHCPv6 */
+ } else if (!strcmp(argv[i], "-i")) {
+ /* enable DUID support for DHCPv4 clients */
+ duid_v4 = 1;
+ } else if (!strcmp(argv[i], "-C")) {
+ /* enable standard DHCID support for DDNS updates */
+ std_dhcid = 1;
} else if (!strcmp(argv[i], "-v")) {
quiet = 0;
} else if (!strcmp(argv[i], "--version")) {
@@ -970,12 +974,13 @@ main(int argc, char **argv) {
}
}
- /* Start a configuration state machine for each interface. */
-#ifdef DHCPv6
- if (local_family == AF_INET6) {
- /* Establish a default DUID. This may be moved to the
- * DHCPv4 area later.
- */
+
+ /*
+ * Establish a default DUID. We always do so for v6 and
+ * do so if desired for v4 via the -D or -i options
+ */
+ if ((local_family == AF_INET6) ||
+ ((local_family == AF_INET) && (duid_v4 == 1))) {
if (default_duid.len == 0) {
if (default_duid.buffer != NULL)
data_string_forget(&default_duid, MDL);
@@ -983,7 +988,11 @@ main(int argc, char **argv) {
if (form_duid(&default_duid, MDL) == ISC_R_SUCCESS)
write_duid(&default_duid);
}
+ }
+ /* Start a configuration state machine for each interface. */
+#ifdef DHCPv6
+ if (local_family == AF_INET6) {
for (ip = interfaces ; ip != NULL ; ip = ip->next) {
for (client = ip->client ; client != NULL ;
client = client->next) {
@@ -1115,9 +1124,9 @@ static void usage()
log_fatal("Usage: dhclient "
#ifdef DHCPv6
- "[-4|-6] [-SNTP1dvrx] [-nw] [-p <port>] [-D LL|LLT]\n"
+ "[-4|-6] [-SNTPI1dvrxc] [-nw] [-p <port>] [-D LL|LLT] \n"
#else /* DHCPv6 */
- "[-1dvrx] [-nw] [-p <port>]\n"
+ "[-C1dvrxc] [-nw] [-p <port>] [-D LL|LLT] \n"
#endif /* DHCPv6 */
" [-s server-addr] [-cf config-file] "
"[-lf lease-file]\n"
@@ -2823,24 +2832,24 @@ make_client_options(struct client_state *client, struct client_lease *lease,
unsigned i;
struct option_cache *oc;
struct option *option = NULL;
- struct buffer *bp = (struct buffer *)0;
+ struct buffer *bp = NULL;
/* If there are any leftover options, get rid of them. */
if (*op)
- option_state_dereference (op, MDL);
+ option_state_dereference(op, MDL);
/* Allocate space for options. */
- option_state_allocate (op, MDL);
+ option_state_allocate(op, MDL);
/* Send the server identifier if provided. */
if (sid)
- save_option (&dhcp_universe, *op, sid);
+ save_option(&dhcp_universe, *op, sid);
- oc = (struct option_cache *)0;
+ oc = NULL;
/* Send the requested address if provided. */
if (rip) {
- client -> requested_address = *rip;
+ client->requested_address = *rip;
i = DHO_DHCP_REQUESTED_ADDRESS;
if (!(option_code_hash_lookup(&option, dhcp_universe.code_hash,
&i, 0, MDL) &&
@@ -2848,22 +2857,22 @@ make_client_options(struct client_state *client, struct client_lease *lease,
option, MDL)))
log_error ("can't make requested address cache.");
else {
- save_option (&dhcp_universe, *op, oc);
- option_cache_dereference (&oc, MDL);
+ save_option(&dhcp_universe, *op, oc);
+ option_cache_dereference(&oc, MDL);
}
option_dereference(&option, MDL);
} else {
- client -> requested_address.len = 0;
+ client->requested_address.len = 0;
}
i = DHO_DHCP_MESSAGE_TYPE;
if (!(option_code_hash_lookup(&option, dhcp_universe.code_hash, &i, 0,
MDL) &&
make_const_option_cache(&oc, NULL, type, 1, option, MDL)))
- log_error ("can't make message type.");
+ log_error("can't make message type.");
else {
- save_option (&dhcp_universe, *op, oc);
- option_cache_dereference (&oc, MDL);
+ save_option(&dhcp_universe, *op, oc);
+ option_cache_dereference(&oc, MDL);
}
option_dereference(&option, MDL);
@@ -2876,8 +2885,8 @@ make_client_options(struct client_state *client, struct client_lease *lease,
if (prl[i]->universe == &dhcp_universe)
len++;
- if (!buffer_allocate (&bp, len, MDL))
- log_error ("can't make parameter list buffer.");
+ if (!buffer_allocate(&bp, len, MDL))
+ log_error("can't make parameter list buffer.");
else {
unsigned code = DHO_DHCP_PARAMETER_REQUEST_LIST;
@@ -2891,15 +2900,69 @@ make_client_options(struct client_state *client, struct client_lease *lease,
&code, 0, MDL) &&
make_const_option_cache(&oc, &bp, NULL, len,
option, MDL)))
- log_error ("can't make option cache");
+ log_error("can't make option cache");
else {
- save_option (&dhcp_universe, *op, oc);
- option_cache_dereference (&oc, MDL);
+ save_option(&dhcp_universe, *op, oc);
+ option_cache_dereference(&oc, MDL);
}
option_dereference(&option, MDL);
}
}
+ /*
+ * If requested (duid_v4 == 1) add an RFC4361 compliant client-identifier
+ * This can be overridden by including a client id in the configuration
+ * file.
+ */
+ if (duid_v4 == 1) {
+ struct data_string client_identifier;
+ int hw_idx, hw_len;
+
+ memset(&client_identifier, 0, sizeof(client_identifier));
+ client_identifier.len = 1 + 4 + default_duid.len;
+ if (!buffer_allocate(&client_identifier.buffer,
+ client_identifier.len, MDL))
+ log_fatal("no memory for default DUID!");
+ client_identifier.data = client_identifier.buffer->data;
+
+ i = DHO_DHCP_CLIENT_IDENTIFIER;
+
+ /* Client-identifier type : 1 byte */
+ *client_identifier.buffer->data = 255;
+
+ /* IAID : 4 bytes
+ * we use the low 4 bytes from the interface address
+ */
+ if (client->interface->hw_address.hlen > 4) {
+ hw_idx = client->interface->hw_address.hlen - 4;
+ hw_len = 4;
+ } else {
+ hw_idx = 0;
+ hw_len = client->interface->hw_address.hlen;
+ }
+ memcpy(&client_identifier.buffer->data + 5 - hw_len,
+ client->interface->hw_address.hbuf + hw_idx,
+ hw_len);
+
+ /* Add the default duid */
+ memcpy(&client_identifier.buffer->data+(1+4),
+ default_duid.data, default_duid.len);
+
+ /* And save the option */
+ if (!(option_code_hash_lookup(&option, dhcp_universe.code_hash,
+ &i, 0, MDL) &&
+ make_const_option_cache(&oc, NULL,
+ (u_int8_t *)client_identifier.data,
+ client_identifier.len,
+ option, MDL)))
+ log_error ("can't make requested client id cache..");
+ else {
+ save_option (&dhcp_universe, *op, oc);
+ option_cache_dereference (&oc, MDL);
+ }
+ option_dereference(&option, MDL);
+ }
+
/* Run statements that need to be run on transmission. */
if (client -> config -> on_transmission)
execute_statements_in_scope
@@ -4522,6 +4585,7 @@ client_dns_update(struct client_state *client, dhcp_ddns_cb_t *ddns_cb)
struct option_cache *oc;
int ignorep;
int result;
+ int ddns_v4_type;
isc_result_t rcode;
/* If we didn't send an FQDN option, we certainly aren't going to
@@ -4564,47 +4628,82 @@ client_dns_update(struct client_state *client, dhcp_ddns_cb_t *ddns_cb)
&global_scope, oc, MDL))
return ISC_R_SUCCESS;
- /* If this is a DHCPv6 client update, make a dhcid string out of
- * the DUID. If this is a DHCPv4 client update, choose either
- * the client identifier, if there is one, or the interface's
- * MAC address.
+ /*
+ * Construct the DHCID value for use in the DDNS update process
+ * We have the newer standard version and the older interim version
+ * chosen by the '-C' option. The interim version is left as is
+ * for backwards compatibility. The standard version is based on
+ * RFC 4701 section 3.3
*/
+
result = 0;
memset(&client_identifier, 0, sizeof(client_identifier));
- if (client->active_lease != NULL) {
- if (((oc =
- lookup_option(&dhcpv6_universe, client->sent_options,
- D6O_CLIENTID)) != NULL) &&
- evaluate_option_cache(&client_identifier, NULL, NULL,
- client, client->sent_options, NULL,
+
+ if (std_dhcid == 1) {
+ /* standard style */
+ ddns_cb->dhcid_class = dns_rdatatype_dhcid;
+ ddns_v4_type = 1;
+ } else {
+ /* interim style */
+ ddns_cb->dhcid_class = dns_rdatatype_txt;
+ /* for backwards compatibility */
+ ddns_v4_type = DHO_DHCP_CLIENT_IDENTIFIER;
+ }
+
+ if (client->active_lease != NULL) {
+ /* V6 request, get the client identifier, then
+ * construct the dhcid for either standard
+ * or interim */
+ if (((oc = lookup_option(&dhcpv6_universe,
+ client->sent_options,
+ D6O_CLIENTID)) != NULL) &&
+ evaluate_option_cache(&client_identifier, NULL,
+ NULL, client,
+ client->sent_options, NULL,
&global_scope, oc, MDL)) {
- /* RFC4701 defines type '2' as being for the DUID
- * field. We aren't using RFC4701 DHCID RR's yet,
- * but this is as good a value as any.
- */
- result = get_dhcid(&ddns_cb->dhcid, 2,
+ result = get_dhcid(ddns_cb, 2,
client_identifier.data,
client_identifier.len);
data_string_forget(&client_identifier, MDL);
} else
log_fatal("Impossible condition at %s:%d.", MDL);
} else {
- if (((oc =
- lookup_option(&dhcp_universe, client->sent_options,
- DHO_DHCP_CLIENT_IDENTIFIER)) != NULL) &&
- evaluate_option_cache(&client_identifier, NULL, NULL,
- client, client->sent_options, NULL,
+ /*
+ * V4 request, use the client id if there is one or the
+ * mac address if there isn't. If we have a client id
+ * we check to see if it is an embedded DUID.
+ */
+ if (((oc = lookup_option(&dhcp_universe,
+ client->sent_options,
+ DHO_DHCP_CLIENT_IDENTIFIER)) != NULL) &&
+ evaluate_option_cache(&client_identifier, NULL,
+ NULL, client,
+ client->sent_options, NULL,
&global_scope, oc, MDL)) {
- result = get_dhcid(&ddns_cb->dhcid,
- DHO_DHCP_CLIENT_IDENTIFIER,
- client_identifier.data,
- client_identifier.len);
+ if ((std_dhcid == 1) && (duid_v4 == 1) &&
+ (client_identifier.data[0] == 255)) {
+ /*
+ * This appears to be an embedded DUID,
+ * extract it and treat it as such
+ */
+ if (client_identifier.len <= 5)
+ log_fatal("Impossible condition at %s:%d.",
+ MDL);
+ result = get_dhcid(ddns_cb, 2,
+ client_identifier.data + 5,
+ client_identifier.len - 5);
+ } else {
+ result = get_dhcid(ddns_cb, ddns_v4_type,
+ client_identifier.data,
+ client_identifier.len);
+ }
data_string_forget(&client_identifier, MDL);
} else
- result = get_dhcid(&ddns_cb->dhcid, 0,
+ result = get_dhcid(ddns_cb, 0,
client->interface->hw_address.hbuf,
client->interface->hw_address.hlen);
}
+
if (!result) {
return ISC_R_SUCCESS;
}
@@ -4886,3 +4985,4 @@ dhclient_ddns_cb_free(dhcp_ddns_cb_t *ddns_cb, char* file, int line) {
ddns_cb_free(ddns_cb, file, line);
}
}
+
diff --git a/common/conflex.c b/common/conflex.c
index 4611616..c99732e 100644
--- a/common/conflex.c
+++ b/common/conflex.c
@@ -879,10 +879,6 @@ intern(char *atom, enum dhcp_token dfv) {
case 'd':
if (!strcasecmp(atom + 1, "b-time-format"))
return DB_TIME_FORMAT;
- if (!strcasecmp (atom + 1, "ns-update"))
- return DNS_UPDATE;
- if (!strcasecmp (atom + 1, "ns-delete"))
- return DNS_DELETE;
if (!strcasecmp (atom + 1, "omain"))
return DOMAIN;
if (!strncasecmp (atom + 1, "omain-", 6)) {
@@ -1178,8 +1174,6 @@ intern(char *atom, enum dhcp_token dfv) {
return TOKEN_NOT;
if (!strcasecmp (atom + 1, "o"))
return TOKEN_NO;
- if (!strcasecmp (atom + 1, "s-update"))
- return NS_UPDATE;
if (!strcasecmp (atom + 1, "oerror"))
return NS_NOERROR;
if (!strcasecmp (atom + 1, "otauth"))
@@ -1496,8 +1490,6 @@ intern(char *atom, enum dhcp_token dfv) {
}
if (!strcasecmp (atom + 1, "nauthenticated"))
return UNAUTHENTICATED;
- if (!strcasecmp (atom + 1, "pdated-dns-rr"))
- return UPDATED_DNS_RR;
if (!strcasecmp (atom + 1, "pdate"))
return UPDATE;
break;
diff --git a/common/dns.c b/common/dns.c
index d3ac966..a04c61d 100644
--- a/common/dns.c
+++ b/common/dns.c
@@ -30,10 +30,12 @@
* asynchronous DNS routines.
*/
+/*! \file common/dns.c
+ */
#include "dhcpd.h"
#include "arpa/nameser.h"
#include <isc/md5.h>
-
+#include <isc/sha2.h>
#include <dns/result.h>
/*
@@ -823,45 +825,123 @@ void repudiate_zone (struct dns_zone **zone)
dns_zone_dereference (zone, MDL);
}
-/* Have to use TXT records for now. */
-#define T_DHCID T_TXT
+/*!
+ * \brief Create an id for a client
+ *
+ * This function is used to create an id for a client to use with DDNS
+ * This version of the function is for the standard style, RFC 4701
+ *
+ * This function takes information from the type and data fields and
+ * mangles it into a dhcid string which it places in ddns_cb. It also
+ * sets a field in ddns_cb to specify the class that should be used
+ * when sending the dhcid, in this case it is a DHCID record so we use
+ * dns_rdatatype_dhcid
+ *
+ * The DHCID we construct is:
+ * 2 bytes - identifier type (see 4701 and IANA)
+ * 1 byte - digest type, currently only SHA256 (1)
+ * n bytes - digest, length depends on digest type, currently 32 for
+ * SHA256
+ *
+ * What we base the digest on is up to the calling code for an id type of
+ * 0 - 1 octet htype followed by hlen octets of chaddr from v4 client request
+ * 1 - data octets from a dhcpv4 client's client identifier option
+ * 2 - the client DUID from a v4 or v6 client's client id option
+ * This identifier is concatenated with the fqdn and the result is digested.
+ */
+int get_std_dhcid(dhcp_ddns_cb_t *ddns_cb,
+ int type,
+ const u_int8_t *identifier,
+ unsigned id_len)
+{
+ struct data_string *id = &ddns_cb->dhcid;
+ isc_sha256_t sha256;
+ unsigned char buf[ISC_SHA256_DIGESTLENGTH];
+ unsigned char fwd_buf[256];
+ unsigned fwd_buflen = 0;
+
+ /* Types can only be 0..(2^16)-1. */
+ if (type < 0 || type > 65535)
+ return (0);
+
+ /* We need to convert the fwd name to wire representation */
+ if (MRns_name_pton((char *)ddns_cb->fwd_name.data, fwd_buf, 256) == -1)
+ return (0);
+ while(fwd_buf[fwd_buflen] != 0) {
+ fwd_buflen += fwd_buf[fwd_buflen] + 1;
+ }
+ fwd_buflen++;
+
+ if (!buffer_allocate(&id->buffer,
+ ISC_SHA256_DIGESTLENGTH + 2 + 1,
+ MDL))
+ return (0);
+ id->data = id->buffer->data;
+
+ /* The two first bytes contain the type identifier. */
+ putUShort(id->buffer->data, (unsigned)type);
+
+ /* The next is the digest type, SHA-256 is 1 */
+ putUChar(id->buffer->data + 2, 1u);
+
+ /* Computing the digest */
+ isc_sha256_init(&sha256);
+ isc_sha256_update(&sha256, identifier, id_len);
+ isc_sha256_update(&sha256, fwd_buf, fwd_buflen);
+ isc_sha256_final(buf, &sha256);
-int get_dhcid (struct data_string *id,
- int type, const u_int8_t *data, unsigned len)
+ memcpy(id->buffer->data + 3, &buf, ISC_SHA256_DIGESTLENGTH);
+
+ id->len = ISC_SHA256_DIGESTLENGTH + 2 + 1;
+
+ return (1);
+}
+
+/*!
+ *
+ * \brief Create an id for a client
+ *
+ * This function is used to create an id for a client to use with DDNS
+ * This version of the function is for the interim style. It is retained
+ * to allow users to continue using the interim style but they should
+ * switch to the standard style (which uses get_std_dhcid) for better
+ * interoperability.
+ *
+ * This function takes information from the type and data fields and
+ * mangles it into a dhcid string which it places in ddns_cb. It also
+ * sets a field in ddns_cb to specify the class that should be used
+ * when sending the dhcid, in this case it is a txt record so we use
+ * dns_rdata_type_txt
+ *
+ * NOTE WELL: this function has issues with how it calculates the
+ * dhcid, they can't be changed now as that would break the records
+ * already in use.
+ */
+
+int get_int_dhcid (dhcp_ddns_cb_t *ddns_cb,
+ int type,
+ const u_int8_t *data,
+ unsigned len)
{
+ struct data_string *id = &ddns_cb->dhcid;
unsigned char buf[ISC_MD5_DIGESTLENGTH];
isc_md5_t md5;
int i;
/* Types can only be 0..(2^16)-1. */
if (type < 0 || type > 65535)
- return 0;
+ return (0);
/*
* Hexadecimal MD5 digest plus two byte type, NUL,
* and one byte for length for dns.
*/
- if (!buffer_allocate (&id -> buffer,
- (ISC_MD5_DIGESTLENGTH * 2) + 4, MDL))
- return 0;
- id -> data = id -> buffer -> data;
+ if (!buffer_allocate(&id -> buffer,
+ (ISC_MD5_DIGESTLENGTH * 2) + 4, MDL))
+ return (0);
+ id->data = id->buffer->data;
/*
- * DHCP clients and servers should use the following forms of client
- * identification, starting with the most preferable, and finishing
- * with the least preferable. If the client does not send any of these
- * forms of identification, the DHCP/DDNS interaction is not defined by
- * this specification. The most preferable form of identification is
- * the Globally Unique Identifier Option [TBD]. Next is the DHCP
- * Client Identifier option. Last is the client's link-layer address,
- * as conveyed in its DHCPREQUEST message. Implementors should note
- * that the link-layer address cannot be used if there are no
- * significant bytes in the chaddr field of the DHCP client's request,
- * because this does not constitute a unique identifier.
- * -- "Interaction between DHCP and DNS"
- * <draft-ietf-dhc-dhcp-dns-12.txt>
- * M. Stapp, Y. Rekhter
- *
* We put the length into the first byte to turn
* this into a dns text string. This avoid needing to
* copy the string to add the byte later.
@@ -893,7 +973,18 @@ int get_dhcid (struct data_string *id,
id->buffer->data[id->len] = 0;
id->terminated = 1;
- return 1;
+ return (1);
+}
+
+int get_dhcid(dhcp_ddns_cb_t *ddns_cb,
+ int type,
+ const u_int8_t *identifier,
+ unsigned id_len)
+{
+ if (ddns_cb->dhcid_class == dns_rdatatype_dhcid)
+ return get_std_dhcid(ddns_cb, type, identifier, id_len);
+ else
+ return get_int_dhcid(ddns_cb, type, identifier, id_len);
}
/*
@@ -1015,12 +1106,12 @@ make_dns_dataset(dns_rdataclass_t dataclass,
* For the server the first step will have a request of:
* The name is not in use
* Add an A RR
- * Add a DHCID RR (currently txt)
+ * Add a DHCID RR
*
* For the client the first step will have a request of:
* The A RR does not exist
* Add an A RR
- * Add a DHCID RR (currently txt)
+ * Add a DHCID RR
*/
static isc_result_t
@@ -1062,7 +1153,7 @@ ddns_modify_fwd_add1(dhcp_ddns_cb_t *ddns_cb,
dataspace++;
/* Add the DHCID RR */
- result = make_dns_dataset(dns_rdataclass_in, dns_rdatatype_txt,
+ result = make_dns_dataset(dns_rdataclass_in, ddns_cb->dhcid_class,
dataspace,
(unsigned char *)ddns_cb->dhcid.data,
ddns_cb->dhcid.len, ddns_cb->ttl);
@@ -1108,7 +1199,7 @@ ddns_modify_fwd_add2(dhcp_ddns_cb_t *ddns_cb,
dns_name_t *pname,
dns_name_t *uname)
{
- isc_result_t result;
+ isc_result_t result = ISC_R_SUCCESS;
/*
* If we are doing conflict resolution (unset) we use a prereq list.
@@ -1117,7 +1208,7 @@ ddns_modify_fwd_add2(dhcp_ddns_cb_t *ddns_cb,
if ((ddns_cb->flags & DDNS_CONFLICT_OVERRIDE) == 0) {
/* Construct the prereq list */
/* The DHCID RR exists and matches the client identity */
- result = make_dns_dataset(dns_rdataclass_in, dns_rdatatype_txt,
+ result = make_dns_dataset(dns_rdataclass_in, ddns_cb->dhcid_class,
dataspace,
(unsigned char *)ddns_cb->dhcid.data,
ddns_cb->dhcid.len, 0);
@@ -1130,7 +1221,7 @@ ddns_modify_fwd_add2(dhcp_ddns_cb_t *ddns_cb,
/* Start constructing the update list.
* Conflict detection override: delete DHCID RRs */
result = make_dns_dataset(dns_rdataclass_any,
- dns_rdatatype_txt,
+ ddns_cb->dhcid_class,
dataspace, NULL, 0, 0);
if (result != ISC_R_SUCCESS) {
return(result);
@@ -1139,7 +1230,7 @@ ddns_modify_fwd_add2(dhcp_ddns_cb_t *ddns_cb,
dataspace++;
/* Add current DHCID RR */
- result = make_dns_dataset(dns_rdataclass_in, dns_rdatatype_txt,
+ result = make_dns_dataset(dns_rdataclass_in, ddns_cb->dhcid_class,
dataspace,
(unsigned char *)ddns_cb->dhcid.data,
ddns_cb->dhcid.len, ddns_cb->ttl);
@@ -1201,11 +1292,11 @@ ddns_modify_fwd_rem1(dhcp_ddns_cb_t *ddns_cb,
dns_name_t *pname,
dns_name_t *uname)
{
- isc_result_t result;
+ isc_result_t result = ISC_R_SUCCESS;
/* Consruct the prereq list */
/* The DHCID RR exists and matches the client identity */
- result = make_dns_dataset(dns_rdataclass_in, dns_rdatatype_txt,
+ result = make_dns_dataset(dns_rdataclass_in, ddns_cb->dhcid_class,
dataspace,
(unsigned char *)ddns_cb->dhcid.data,
ddns_cb->dhcid.len, 0);
@@ -1271,7 +1362,7 @@ ddns_modify_fwd_rem2(dhcp_ddns_cb_t *ddns_cb,
/* Construct the update list */
/* Delete DHCID RR */
- result = make_dns_dataset(dns_rdataclass_none, dns_rdatatype_txt,
+ result = make_dns_dataset(dns_rdataclass_none, ddns_cb->dhcid_class,
dataspace,
(unsigned char *)ddns_cb->dhcid.data,
ddns_cb->dhcid.len, 0);
diff --git a/common/parse.c b/common/parse.c
index fc51327..7477543 100644
--- a/common/parse.c
+++ b/common/parse.c
@@ -3558,42 +3558,7 @@ int parse_numeric_expression (expr, cfile, lose)
}
return 1;
}
-#if defined (NSUPDATE_OLD)
-/*
- * dns-expression :==
- * UPDATE LPAREN ns-class COMMA ns-type COMMA data-expression COMMA
- * data-expression COMMA numeric-expression RPAREN
- * DELETE LPAREN ns-class COMMA ns-type COMMA data-expression COMMA
- * data-expression RPAREN
- * EXISTS LPAREN ns-class COMMA ns-type COMMA data-expression COMMA
- * data-expression RPAREN
- * NOT EXISTS LPAREN ns-class COMMA ns-type COMMA data-expression COMMA
- * data-expression RPAREN
- * ns-class :== IN | CHAOS | HS | NUMBER
- * ns-type :== A | PTR | MX | TXT | NUMBER
- */
-
-int parse_dns_expression (expr, cfile, lose)
- struct expression **expr;
- struct parse *cfile;
- int *lose;
-{
- /* Parse an expression... */
- if (!parse_expression (expr, cfile, lose, context_dns,
- (struct expression **)0, expr_none))
- return 0;
- if (!is_dns_expression (*expr) &&
- (*expr) -> op != expr_variable_reference &&
- (*expr) -> op != expr_funcall) {
- expression_dereference (expr, MDL);
- parse_warn (cfile, "Expecting a dns update subexpression.");
- *lose = 1;
- return 0;
- }
- return 1;
-}
-#endif /* NSUPDATE_OLD */
/* Parse a subexpression that does not contain a binary operator. */
int parse_non_binary (expr, cfile, lose, context)
@@ -3608,11 +3573,6 @@ int parse_non_binary (expr, cfile, lose, context)
struct expression *nexp, **ep;
int known;
char *cptr;
-#if defined (NSUPDATE_OLD)
- enum expr_op opcode;
- const char *s;
- unsigned long u;
-#endif
isc_result_t status;
unsigned len;
@@ -3645,12 +3605,7 @@ int parse_non_binary (expr, cfile, lose, context)
case TOKEN_NOT:
token = next_token (&val, (unsigned *)0, cfile);
-#if defined(NSUPDATE_OLD)
- if (context == context_dns) {
- token = peek_token (&val, (unsigned *)0, cfile);
- goto not_exists;
- }
-#endif
+
if (!expression_allocate (expr, MDL))
log_fatal ("can't allocate expression");
(*expr) -> op = expr_not;
@@ -3662,7 +3617,7 @@ int parse_non_binary (expr, cfile, lose, context)
}
*lose = 1;
expression_dereference (expr, MDL);
- return 0;
+ return (0);
}
if (!is_boolean_expression ((*expr) -> data.not)) {
*lose = 1;
@@ -3694,10 +3649,6 @@ int parse_non_binary (expr, cfile, lose, context)
break;
case EXISTS:
-#if defined(NSUPDATE_OLD)
- if (context == context_dns)
- goto ns_exists;
-#endif
token = next_token (&val, (unsigned *)0, cfile);
if (!expression_allocate (expr, MDL))
log_fatal ("can't allocate expression");
@@ -3710,7 +3661,7 @@ int parse_non_binary (expr, cfile, lose, context)
(*expr)->data.option == NULL) {
*lose = 1;
expression_dereference (expr, MDL);
- return 0;
+ return (0);
}
break;
@@ -4011,285 +3962,7 @@ int parse_non_binary (expr, cfile, lose, context)
goto norparen;
break;
-#if defined(NSUPDATE_OLD)
- /* dns-update and dns-delete are present for historical
- purposes, but are deprecated in favor of ns-update
- in combination with update, delete, exists and not
- exists. */
- case DNS_UPDATE:
- case DNS_DELETE:
-#if !defined (NSUPDATE)
- parse_warn (cfile,
- "Please rebuild dhcpd with --with-nsupdate.");
-#endif
- token = next_token (&val, (unsigned *)0, cfile);
- if (token == DNS_UPDATE)
- opcode = expr_ns_add;
- else
- opcode = expr_ns_delete;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != LPAREN)
- goto nolparen;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != STRING) {
- parse_warn (cfile,
- "parse_expression: expecting string.");
- badnsupdate:
- skip_to_semi (cfile);
- *lose = 1;
- return 0;
- }
-
- if (!strcasecmp (val, "a"))
- u = T_A;
- else if (!strcasecmp (val, "aaaa"))
- u = T_AAAA;
- else if (!strcasecmp (val, "ptr"))
- u = T_PTR;
- else if (!strcasecmp (val, "mx"))
- u = T_MX;
- else if (!strcasecmp (val, "cname"))
- u = T_CNAME;
- else if (!strcasecmp (val, "TXT"))
- u = T_TXT;
- else {
- parse_warn (cfile, "unexpected rrtype: %s", val);
- goto badnsupdate;
- }
-
- s = (opcode == expr_ns_add
- ? "old-dns-update"
- : "old-dns-delete");
- cptr = dmalloc (strlen (s) + 1, MDL);
- if (!cptr)
- log_fatal ("can't allocate name for %s", s);
- strcpy (cptr, s);
- if (!expression_allocate (expr, MDL))
- log_fatal ("can't allocate expression");
- (*expr) -> op = expr_funcall;
- (*expr) -> data.funcall.name = cptr;
-
- /* Fake up a function call. */
- ep = &(*expr) -> data.funcall.arglist;
- if (!expression_allocate (ep, MDL))
- log_fatal ("can't allocate expression");
- (*ep) -> op = expr_arg;
- if (!make_const_int (&(*ep) -> data.arg.val, u))
- log_fatal ("can't allocate rrtype value.");
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
- ep = &((*ep) -> data.arg.next);
- if (!expression_allocate (ep, MDL))
- log_fatal ("can't allocate expression");
- (*ep) -> op = expr_arg;
- if (!(parse_data_expression (&(*ep) -> data.arg.val,
- cfile, lose)))
- goto nodata;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
-
- ep = &((*ep) -> data.arg.next);
- if (!expression_allocate (ep, MDL))
- log_fatal ("can't allocate expression");
- (*ep) -> op = expr_arg;
- if (!(parse_data_expression (&(*ep) -> data.arg.val,
- cfile, lose)))
- goto nodata;
-
- if (opcode == expr_ns_add) {
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
-
- ep = &((*ep) -> data.arg.next);
- if (!expression_allocate (ep, MDL))
- log_fatal ("can't allocate expression");
- (*ep) -> op = expr_arg;
- if (!(parse_numeric_expression (&(*ep) -> data.arg.val,
- cfile, lose))) {
- parse_warn (cfile,
- "expecting numeric expression.");
- goto badnsupdate;
- }
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != RPAREN)
- goto norparen;
- break;
-
- case NS_UPDATE:
-#if !defined (NSUPDATE)
- parse_warn (cfile,
- "Please rebuild dhcpd with --with-nsupdate.");
-#endif
- token = next_token (&val, (unsigned *)0, cfile);
- if (!expression_allocate (expr, MDL))
- log_fatal ("can't allocate expression");
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != LPAREN)
- goto nolparen;
-
- nexp = *expr;
- do {
- nexp -> op = expr_dns_transaction;
- if (!(parse_dns_expression
- (&nexp -> data.dns_transaction.car,
- cfile, lose)))
- {
- if (!*lose)
- parse_warn
- (cfile,
- "expecting dns expression.");
- expression_dereference (expr, MDL);
- *lose = 1;
- return 0;
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
-
- if (token == COMMA) {
- if (!(expression_allocate
- (&nexp -> data.dns_transaction.cdr,
- MDL)))
- log_fatal
- ("can't allocate expression");
- nexp = nexp -> data.dns_transaction.cdr;
- }
- } while (token == COMMA);
-
- if (token != RPAREN)
- goto norparen;
- break;
-
- /* NOT EXISTS is special cased above... */
- not_exists:
- token = peek_token (&val, (unsigned *)0, cfile);
- if (token != EXISTS) {
- parse_warn (cfile, "expecting DNS prerequisite.");
- *lose = 1;
- return 0;
- }
- opcode = expr_ns_not_exists;
- goto nsupdatecode;
- case TOKEN_ADD:
- opcode = expr_ns_add;
- goto nsupdatecode;
- case TOKEN_DELETE:
- opcode = expr_ns_delete;
- goto nsupdatecode;
- ns_exists:
- opcode = expr_ns_exists;
- nsupdatecode:
- token = next_token (&val, (unsigned *)0, cfile);
-
-#if !defined (NSUPDATE)
- parse_warn (cfile,
- "Please rebuild dhcpd with --with-nsupdate.");
-#endif
- if (!expression_allocate (expr, MDL))
- log_fatal ("can't allocate expression");
- (*expr) -> op = opcode;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != LPAREN)
- goto nolparen;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (!is_identifier (token) && token != NUMBER) {
- parse_warn (cfile, "expecting identifier or number.");
- badnsop:
- expression_dereference (expr, MDL);
- skip_to_semi (cfile);
- *lose = 1;
- return 0;
- }
-
- if (token == NUMBER)
- (*expr) -> data.ns_add.rrclass = atoi (val);
- else if (!strcasecmp (val, "in"))
- (*expr) -> data.ns_add.rrclass = C_IN;
- else if (!strcasecmp (val, "chaos"))
- (*expr) -> data.ns_add.rrclass = C_CHAOS;
- else if (!strcasecmp (val, "hs"))
- (*expr) -> data.ns_add.rrclass = C_HS;
- else {
- parse_warn (cfile, "unexpected rrclass: %s", val);
- goto badnsop;
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
- token = next_token (&val, (unsigned *)0, cfile);
- if (!is_identifier (token) && token != NUMBER) {
- parse_warn (cfile, "expecting identifier or number.");
- goto badnsop;
- }
-
- if (token == NUMBER)
- (*expr) -> data.ns_add.rrtype = atoi (val);
- else if (!strcasecmp (val, "a"))
- (*expr) -> data.ns_add.rrtype = T_A;
- else if (!strcasecmp (val, "aaaa"))
- (*expr) -> data.ns_add.rrtype = T_AAAA;
- else if (!strcasecmp (val, "ptr"))
- (*expr) -> data.ns_add.rrtype = T_PTR;
- else if (!strcasecmp (val, "mx"))
- (*expr) -> data.ns_add.rrtype = T_MX;
- else if (!strcasecmp (val, "cname"))
- (*expr) -> data.ns_add.rrtype = T_CNAME;
- else if (!strcasecmp (val, "TXT"))
- (*expr) -> data.ns_add.rrtype = T_TXT;
- else {
- parse_warn (cfile, "unexpected rrtype: %s", val);
- goto badnsop;
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
-
- if (!(parse_data_expression
- (&(*expr) -> data.ns_add.rrname, cfile, lose)))
- goto nodata;
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
-
- if (!(parse_data_expression
- (&(*expr) -> data.ns_add.rrdata, cfile, lose)))
- goto nodata;
-
- if (opcode == expr_ns_add) {
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != COMMA)
- goto nocomma;
-
- if (!(parse_numeric_expression
- (&(*expr) -> data.ns_add.ttl, cfile,
- lose))) {
- if (!*lose)
- parse_warn (cfile,
- "expecting numeric expression.");
- goto badnsupdate;
- }
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != RPAREN)
- goto norparen;
- break;
-#endif /* NSUPDATE_OLD */
case OPTION:
case CONFIG_OPTION:
if (!expression_allocate (expr, MDL))
@@ -4366,44 +4039,7 @@ int parse_non_binary (expr, cfile, lose, context)
(*expr) -> op = expr_host_decl_name;
break;
-#if defined(NSUPDATE_OLD)
- case UPDATED_DNS_RR:
- token = next_token (&val, (unsigned *)0, cfile);
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != LPAREN)
- goto nolparen;
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != STRING) {
- parse_warn (cfile, "expecting string.");
- bad_rrtype:
- *lose = 1;
- return 0;
- }
- if (!strcasecmp (val, "a"))
- s = "ddns-fwd-name";
- else if (!strcasecmp (val, "ptr"))
- s = "ddns-rev-name";
- else {
- parse_warn (cfile, "invalid DNS rrtype: %s", val);
- goto bad_rrtype;
- }
-
- token = next_token (&val, (unsigned *)0, cfile);
- if (token != RPAREN)
- goto norparen;
-
- if (!expression_allocate (expr, MDL))
- log_fatal ("can't allocate expression");
- (*expr) -> op = expr_variable_reference;
- (*expr) -> data.variable =
- dmalloc (strlen (s) + 1, MDL);
- if (!(*expr) -> data.variable)
- log_fatal ("can't allocate variable name.");
- strcpy ((*expr) -> data.variable, s);
- break;
-#endif /* NSUPDATE_OLD */
case PACKET:
token = next_token (&val, (unsigned *)0, cfile);
if (!expression_allocate (expr, MDL))
diff --git a/common/tree.c b/common/tree.c
index 8c2056c..26e0add 100644
--- a/common/tree.c
+++ b/common/tree.c
@@ -645,15 +645,6 @@ int evaluate_expression (result, packet, lease, client_state,
status = (evaluate_data_expression
(&bv -> value.data, packet, lease, client_state,
in_options, cfg_options, scope, expr, MDL));
-#if defined (NSUPDATE_OLD)
- } else if (is_dns_expression (expr)) {
- if (!binding_value_allocate (&bv, MDL))
- return 0;
- bv -> type = binding_dns;
- status = (evaluate_dns_expression
- (&bv -> value.dns, packet, lease, client_state,
- in_options, cfg_options, scope, expr));
-#endif
} else {
log_error ("%s: invalid expression type: %d",
"evaluate_expression", expr -> op);
@@ -699,19 +690,6 @@ int binding_value_dereference (struct binding_value **v,
if (bv -> value.data.buffer)
data_string_forget (&bv -> value.data, file, line);
break;
- case binding_dns:
-#if defined (NSUPDATE_OLD)
- if (bv -> value.dns) {
- if (bv -> value.dns -> r_data) {
- dfree (bv -> value.dns -> r_data_ephem, MDL);
- bv -> value.dns -> r_data = (unsigned char *)0;
- bv -> value.dns -> r_data_ephem =
- (unsigned char *)0;
- }
- minires_freeupdrec (bv -> value.dns);
- }
- break;
-#endif
default:
log_error ("%s(%d): invalid binding type: %d",
file, line, bv -> type);
@@ -721,270 +699,6 @@ int binding_value_dereference (struct binding_value **v,
return 1;
}
-#if defined (NSUPDATE_OLD)
-int evaluate_dns_expression (result, packet, lease, client_state, in_options,
- cfg_options, scope, expr)
- ns_updrec **result;
- struct packet *packet;
- struct lease *lease;
- struct client_state *client_state;
- struct option_state *in_options;
- struct option_state *cfg_options;
- struct binding_scope **scope;
- struct expression *expr;
-{
- unsigned long ttl = 0;
- char *tname;
- struct data_string name, data;
- int r0, r1, r2;
-
- if (!result || *result) {
- log_error ("evaluate_dns_expression called with non-null %s",
- "result pointer");
-#if defined (POINTER_DEBUG)
- abort ();
-#else
- return 0;
-#endif
- }
-
- switch (expr -> op) {
-#if defined (NSUPDATE)
- case expr_ns_add:
- r0 = evaluate_numeric_expression (&ttl, packet, lease,
- client_state,
- in_options, cfg_options,
- scope,
- expr -> data.ns_add.ttl);
- goto nsfinish;
-
- case expr_ns_exists:
- ttl = 1;
-
- case expr_ns_delete:
- case expr_ns_not_exists:
- r0 = 1;
- nsfinish:
- memset (&name, 0, sizeof name);
- r1 = evaluate_data_expression (&name, packet, lease,
- client_state,
- in_options, cfg_options, scope,
- expr -> data.ns_add.rrname,
- MDL);
- if (r1) {
- /* The result of the evaluation may or may not
- be NUL-terminated, but we need it
- terminated for sure, so we have to allocate
- a buffer and terminate it. */
- tname = dmalloc (name.len + 1, MDL);
- if (!tname) {
- r2 = 0;
- r1 = 0;
- data_string_forget (&name, MDL);
- } else {
- memcpy (tname, name.data, name.len);
- tname [name.len] = 0;
- memset (&data, 0, sizeof data);
- r2 = evaluate_data_expression
- (&data, packet, lease, client_state,
- in_options, cfg_options, scope,
- expr -> data.ns_add.rrdata, MDL);
- }
- } else {
- r2 = 0;
- tname = NULL;
- }
- if (r0 && r1 && (r2 || expr -> op != expr_ns_add)) {
- *result = minires_mkupdrec (((expr -> op == expr_ns_add ||
- expr -> op == expr_ns_delete)
- ? S_UPDATE : S_PREREQ),
- tname,
- expr -> data.ns_add.rrclass,
- expr -> data.ns_add.rrtype,
- ttl);
- if (!*result) {
- ngood:
- if (r2) {
- data_string_forget (&data, MDL);
- r2 = 0;
- }
- } else {
- if (data.len) {
- /* As a special case, if we get exactly
- four bytes of data, it's an IP address
- represented as a 32-bit quantity, which
- is actually what we *should* be getting
- here. Because res_mkupdrec is currently
- broken and expects a dotted quad, convert
- it. This should be fixed when the new
- resolver is merged. */
- if (data.len == 4) {
- (*result) -> r_data_ephem =
- dmalloc (16, MDL);
- if (!(*result) -> r_data_ephem)
- goto dpngood;
- (*result) -> r_data =
- (*result) -> r_data_ephem;
- /*%Audit% 16 bytes max. %2004.06.17,Safe%*/
- sprintf ((char *)(*result) -> r_data_ephem,
- "%u.%u.%u.%u",
- data.data [0] & 0xff,
- data.data [1] & 0xff,
- data.data [2] & 0xff,
- data.data [3] & 0xff);
- (*result) -> r_size =
- strlen ((const char *)
- (*result) -> r_data);
- } else {
- (*result) -> r_size = data.len;
- (*result) -> r_data_ephem =
- dmalloc (data.len, MDL);
- if (!(*result) -> r_data_ephem) {
- dpngood: /* double plus ungood. */
- minires_freeupdrec (*result);
- *result = 0;
- goto ngood;
- }
- (*result) -> r_data =
- (*result) -> r_data_ephem;
- memcpy ((*result) -> r_data_ephem,
- data.data, data.len);
- }
- } else {
- (*result) -> r_data = 0;
- (*result) -> r_size = 0;
- }
- switch (expr -> op) {
- case expr_ns_add:
- (*result) -> r_opcode = ADD;
- break;
- case expr_ns_delete:
- (*result) -> r_opcode = DELETE;
- break;
- case expr_ns_exists:
- (*result) -> r_opcode = YXRRSET;
- break;
- case expr_ns_not_exists:
- (*result) -> r_opcode = NXRRSET;
- break;
-
- /* Can't happen, but satisfy gcc. */
- default:
- break;
- }
- }
- }
- if (r1) {
- data_string_forget (&name, MDL);
- dfree (tname, MDL);
- }
- if (r2)
- data_string_forget (&data, MDL);
- /* One flaw in the thinking here: an IP address and an
- ASCII string both look like data expressions, but
- for A records, we want an ASCII string, not a
- binary IP address. Do I need to turn binary IP
- addresses into a separate type? */
- return (r0 && r1 &&
- (r2 || expr -> op != expr_ns_add) && *result);
-
-#else
- case expr_ns_add:
- case expr_ns_delete:
- case expr_ns_exists:
- case expr_ns_not_exists:
- return 0;
-#endif
- case expr_funcall:
- log_error ("%s: dns values for functions not supported.",
- expr -> data.funcall.name);
- break;
-
- case expr_variable_reference:
- log_error ("%s: dns values for variables not supported.",
- expr -> data.variable);
- break;
-
- case expr_check:
- case expr_equal:
- case expr_not_equal:
- case expr_regex_match:
- case expr_iregex_match:
- case expr_and:
- case expr_or:
- case expr_not:
- case expr_match:
- case expr_static:
- case expr_known:
- case expr_exists:
- case expr_variable_exists:
- log_error ("Boolean opcode in evaluate_dns_expression: %d",
- expr -> op);
- return 0;
-
- case expr_none:
- case expr_substring:
- case expr_suffix:
- case expr_lcase:
- case expr_ucase:
- case expr_option:
- case expr_hardware:
- case expr_const_data:
- case expr_packet:
- case expr_concat:
- case expr_encapsulate:
- case expr_host_lookup:
- case expr_encode_int8:
- case expr_encode_int16:
- case expr_encode_int32:
- case expr_binary_to_ascii:
- case expr_reverse:
- case expr_filename:
- case expr_sname:
- case expr_pick_first_value:
- case expr_host_decl_name:
- case expr_config_option:
- case expr_leased_address:
- case expr_null:
- case expr_gethostname:
- log_error ("Data opcode in evaluate_dns_expression: %d",
- expr -> op);
- return 0;
-
- case expr_extract_int8:
- case expr_extract_int16:
- case expr_extract_int32:
- case expr_const_int:
- case expr_lease_time:
- case expr_dns_transaction:
- case expr_add:
- case expr_subtract:
- case expr_multiply:
- case expr_divide:
- case expr_remainder:
- case expr_binary_and:
- case expr_binary_or:
- case expr_binary_xor:
- case expr_client_state:
- log_error ("Numeric opcode in evaluate_dns_expression: %d",
- expr -> op);
- return 0;
-
- case expr_function:
- log_error ("Function opcode in evaluate_dns_expression: %d",
- expr -> op);
- return 0;
-
- case expr_arg:
- break;
- }
-
- log_error ("Bogus opcode in evaluate_dns_expression: %d",
- expr -> op);
- return 0;
-}
-#endif /* defined (NSUPDATE_OLD) */
-
int evaluate_boolean_expression (result, packet, lease, client_state,
in_options, cfg_options, scope, expr)
int *result;
@@ -1056,20 +770,7 @@ int evaluate_boolean_expression (result, packet, lease, client_state,
else
*result = expr -> op == expr_not_equal;
break;
-#if defined (NSUPDATE_OLD)
- case binding_dns:
-#if defined (NSUPDATE)
- /* XXX This should be a comparison for equal
- XXX values, not for identity. */
- if (bv -> value.dns == obv -> value.dns)
- *result = expr -> op == expr_equal;
- else
- *result = expr -> op == expr_not_equal;
-#else
- *result = expr -> op == expr_not_equal;
-#endif
- break;
-#endif /* NSUPDATE_OLD */
+
case binding_function:
if (bv -> value.fundef == obv -> value.fundef)
*result = expr -> op == expr_equal;
@@ -2369,7 +2070,7 @@ int evaluate_data_expression (result, packet, lease, client_state,
case expr_ns_delete:
case expr_ns_exists:
case expr_ns_not_exists:
- log_error ("dns update opcode in evaluate_data_expression: %d",
+ log_error ("dns opcode in evaluate_boolean_expression: %d",
expr -> op);
return 0;
@@ -2398,11 +2099,6 @@ int evaluate_numeric_expression (result, packet, lease, client_state,
{
struct data_string data;
int status, sleft, sright;
-#if defined (NSUPDATE_OLD)
- ns_updrec *nut;
- ns_updque uq;
- struct expression *cur, *next;
-#endif
struct binding *binding;
struct binding_value *bv;
@@ -2541,53 +2237,6 @@ int evaluate_numeric_expression (result, packet, lease, client_state,
#endif
return (1);
- case expr_dns_transaction:
-#if !defined (NSUPDATE_OLD)
- return 0;
-#else
- if (!resolver_inited) {
- minires_ninit (&resolver_state);
- resolver_inited = 1;
- resolver_state.retrans = 1;
- resolver_state.retry = 1;
- }
- ISC_LIST_INIT (uq);
- cur = expr;
- do {
- next = cur -> data.dns_transaction.cdr;
- nut = 0;
- status = (evaluate_dns_expression
- (&nut, packet,
- lease, client_state, in_options, cfg_options,
- scope, cur -> data.dns_transaction.car));
- if (!status)
- goto dns_bad;
- ISC_LIST_APPEND (uq, nut, r_link);
- cur = next;
- } while (next);
-
- /* Do the update and record the error code, if there was
- an error; otherwise set it to NOERROR. */
- *result = minires_nupdate (&resolver_state,
- ISC_LIST_HEAD (uq));
- status = 1;
-
- print_dns_status ((int)*result, &uq);
-
- dns_bad:
- while (!ISC_LIST_EMPTY (uq)) {
- ns_updrec *tmp = ISC_LIST_HEAD (uq);
- ISC_LIST_UNLINK (uq, tmp, r_link);
- if (tmp -> r_data_ephem) {
- dfree (tmp -> r_data_ephem, MDL);
- tmp -> r_data = (unsigned char *)0;
- tmp -> r_data_ephem = (unsigned char *)0;
- }
- minires_freeupdrec (tmp);
- }
- return status;
-#endif /* NSUPDATE_OLD */
-
case expr_variable_reference:
if (scope && *scope) {
binding = find_binding (*scope, expr -> data.variable);
@@ -2877,14 +2526,6 @@ int evaluate_numeric_expression (result, packet, lease, client_state,
return 0;
}
- case expr_ns_add:
- case expr_ns_delete:
- case expr_ns_exists:
- case expr_ns_not_exists:
- log_error ("dns opcode in evaluate_numeric_expression: %d",
- expr -> op);
- return 0;
-
case expr_function:
log_error ("function definition in evaluate_numeric_expr");
return 0;
@@ -3182,38 +2823,6 @@ void expression_dereference (eptr, file, line)
(&expr -> data.reverse.buffer, file, line);
break;
- case expr_dns_transaction:
- if (expr -> data.dns_transaction.car)
- expression_dereference (&expr -> data.dns_transaction.car,
- file, line);
- if (expr -> data.dns_transaction.cdr)
- expression_dereference (&expr -> data.dns_transaction.cdr,
- file, line);
- break;
-
- case expr_ns_add:
- if (expr -> data.ns_add.rrname)
- expression_dereference (&expr -> data.ns_add.rrname,
- file, line);
- if (expr -> data.ns_add.rrdata)
- expression_dereference (&expr -> data.ns_add.rrdata,
- file, line);
- if (expr -> data.ns_add.ttl)
- expression_dereference (&expr -> data.ns_add.ttl,
- file, line);
- break;
-
- case expr_ns_delete:
- case expr_ns_exists:
- case expr_ns_not_exists:
- if (expr -> data.ns_delete.rrname)
- expression_dereference (&expr -> data.ns_delete.rrname,
- file, line);
- if (expr -> data.ns_delete.rrdata)
- expression_dereference (&expr -> data.ns_delete.rrdata,
- file, line);
- break;
-
case expr_variable_reference:
case expr_variable_exists:
if (expr -> data.variable)
@@ -3262,15 +2871,6 @@ void expression_dereference (eptr, file, line)
free_expression (expr, MDL);
}
-int is_dns_expression (expr)
- struct expression *expr;
-{
- return (expr -> op == expr_ns_add ||
- expr -> op == expr_ns_delete ||
- expr -> op == expr_ns_exists ||
- expr -> op == expr_ns_not_exists);
-}
-
int is_boolean_expression (expr)
struct expression *expr;
{
@@ -3325,7 +2925,6 @@ int is_numeric_expression (expr)
expr -> op == expr_extract_int32 ||
expr -> op == expr_const_int ||
expr -> op == expr_lease_time ||
- expr -> op == expr_dns_transaction ||
expr -> op == expr_add ||
expr -> op == expr_subtract ||
expr -> op == expr_multiply ||
@@ -3340,11 +2939,7 @@ int is_numeric_expression (expr)
int is_compound_expression (expr)
struct expression *expr;
{
- return (expr -> op == expr_ns_add ||
- expr -> op == expr_ns_delete ||
- expr -> op == expr_ns_exists ||
- expr -> op == expr_ns_not_exists ||
- expr -> op == expr_substring ||
+ return (expr -> op == expr_substring ||
expr -> op == expr_suffix ||
expr -> op == expr_option ||
expr -> op == expr_concat ||
@@ -3357,8 +2952,7 @@ int is_compound_expression (expr)
expr -> op == expr_config_option ||
expr -> op == expr_extract_int8 ||
expr -> op == expr_extract_int16 ||
- expr -> op == expr_extract_int32 ||
- expr -> op == expr_dns_transaction);
+ expr -> op == expr_extract_int32);
}
static int op_val (enum expr_op);
@@ -3456,8 +3050,6 @@ enum expression_context expression_context (struct expression *expr)
return context_numeric;
if (is_boolean_expression (expr))
return context_boolean;
- if (is_dns_expression (expr))
- return context_dns;
return context_any;
}
@@ -3928,99 +3520,6 @@ int write_expression (file, expr, col, indent, firstp)
"lease-time");
break;
- case expr_dns_transaction:
- col = token_print_indent (file, col, indent, "", "",
- "ns-update");
- col = token_print_indent (file, col, indent, " ", "",
- "(");
- scol = 0;
- for (e = expr;
- e && e -> op == expr_dns_transaction;
- e = e -> data.dns_transaction.cdr) {
- if (!scol) {
- scol = col;
- firstp = 1;
- } else
- firstp = 0;
- col = write_expression (file,
- e -> data.dns_transaction.car,
- col, scol, firstp);
- if (e -> data.dns_transaction.cdr)
- col = token_print_indent (file, col, scol,
- "", " ", ",");
- }
- if (e)
- col = write_expression (file, e, col, scol, 0);
- col = token_print_indent (file, col, indent, "", "", ")");
- break;
-
- case expr_ns_add:
- col = token_print_indent (file, col, indent, "", "",
- "update");
- col = token_print_indent (file, col, indent, " ", "",
- "(");
- scol = col;
- sprintf (obuf, "%d", expr -> data.ns_add.rrclass);
- col = token_print_indent (file, col, scol, "", "", obuf);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- sprintf (obuf, "%d", expr -> data.ns_add.rrtype);
- col = token_print_indent (file, col, scol, "", "", obuf);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- col = write_expression (file, expr -> data.ns_add.rrname,
- col, scol, 0);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- col = write_expression (file, expr -> data.ns_add.rrdata,
- col, scol, 0);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- col = write_expression (file, expr -> data.ns_add.ttl,
- col, scol, 0);
- col = token_print_indent (file, col, indent, "", "",
- ")");
- break;
-
- case expr_ns_delete:
- col = token_print_indent (file, col, indent, "", "",
- "delete");
- col = token_print_indent (file, col, indent, " ", "",
- "(");
- finish_ns_small:
- scol = col;
- sprintf (obuf, "%d", expr -> data.ns_add.rrclass);
- col = token_print_indent (file, col, scol, "", "", obuf);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- sprintf (obuf, "%d", expr -> data.ns_add.rrtype);
- col = token_print_indent (file, col, scol, "", "", obuf);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- col = write_expression (file, expr -> data.ns_add.rrname,
- col, scol, 0);
- col = token_print_indent (file, col, scol, "", " ",
- ",");
- col = write_expression (file, expr -> data.ns_add.rrdata,
- col, scol, 0);
- col = token_print_indent (file, col, indent, "", "",
- ")");
- break;
-
- case expr_ns_exists:
- col = token_print_indent (file, col, indent, "", "",
- "exists");
- col = token_print_indent (file, col, indent, " ", "",
- "(");
- goto finish_ns_small;
-
- case expr_ns_not_exists:
- col = token_print_indent (file, col, indent, "", "",
- "not exists");
- col = token_print_indent (file, col, indent, " ", "",
- "(");
- goto finish_ns_small;
-
case expr_static:
col = token_print_indent (file, col, indent, "", "",
"static");
@@ -4293,12 +3792,7 @@ int data_subexpression_length (int *rv,
case expr_const_int:
case expr_exists:
case expr_known:
- case expr_dns_transaction:
case expr_static:
- case expr_ns_add:
- case expr_ns_delete:
- case expr_ns_exists:
- case expr_ns_not_exists:
case expr_not_equal:
case expr_null:
case expr_variable_exists:
@@ -4349,12 +3843,6 @@ int expr_valid_for_context (struct expression *expr,
return 1;
return 0;
- case context_dns:
- if (is_dns_expression (expr)) {
- return 1;
- }
- return 0;
-
case context_data_or_numeric:
if (is_numeric_expression (expr) ||
is_data_expression (expr)) {
diff --git a/includes/dhcpd.h b/includes/dhcpd.h
index 1d2bf2c..7e756e0 100644
--- a/includes/dhcpd.h
+++ b/includes/dhcpd.h
@@ -638,6 +638,7 @@ struct lease_state {
#define DDNS_UPDATE_STYLE_NONE 0
#define DDNS_UPDATE_STYLE_AD_HOC 1
#define DDNS_UPDATE_STYLE_INTERIM 2
+#define DDNS_UPDATE_STYLE_STANDARD 3
/* Server option names. */
@@ -1627,6 +1628,9 @@ typedef struct dhcp_ddns_cb {
void *transaction;
void *dataspace;
+
+ dns_rdataclass_t dhcid_class;
+ char *lease_tag;
} dhcp_ddns_cb_t;
extern struct ipv6_pool **pools;
@@ -2047,11 +2051,6 @@ struct expression *parse_domain_list(struct parse *cfile, int);
/* tree.c */
-#if defined (NSUPDATE)
-extern struct __res_state resolver_state;
-extern int resolver_inited;
-#endif
-
extern struct binding_scope *global_scope;
pair cons (caddr_t, pair);
int make_const_option_cache (struct option_cache **, struct buffer **,
@@ -2079,15 +2078,6 @@ int evaluate_expression (struct binding_value **, struct packet *,
struct binding_scope **, struct expression *,
const char *, int);
int binding_value_dereference (struct binding_value **, const char *, int);
-#if defined (NSUPDATE_OLD)
-int evaluate_dns_expression (ns_updrec **, struct packet *,
- struct lease *,
- struct client_state *,
- struct option_state *,
- struct option_state *,
- struct binding_scope **,
- struct expression *);
-#endif
int evaluate_boolean_expression (int *,
struct packet *, struct lease *,
struct client_state *,
@@ -2913,21 +2903,18 @@ int icmp_echorequest (struct iaddr *);
isc_result_t icmp_echoreply (omapi_object_t *);
/* dns.c */
-#if defined (NSUPDATE)
-isc_result_t find_tsig_key (ns_tsig_key **, const char *, struct dns_zone *);
-void tkey_free (ns_tsig_key **);
-#endif
isc_result_t enter_dns_zone (struct dns_zone *);
isc_result_t dns_zone_lookup (struct dns_zone **, const char *);
int dns_zone_dereference (struct dns_zone **, const char *, int);
#if defined (NSUPDATE)
#define FIND_FORWARD 0
#define FIND_REVERSE 1
+isc_result_t find_tsig_key (ns_tsig_key **, const char *, struct dns_zone *);
+void tkey_free (ns_tsig_key **);
isc_result_t find_cached_zone (dhcp_ddns_cb_t *, int);
void forget_zone (struct dns_zone **);
void repudiate_zone (struct dns_zone **);
-//void cache_found_zone (ns_class, char *, struct in_addr *, int);
-int get_dhcid (struct data_string *, int, const u_int8_t *, unsigned);
+int get_dhcid (dhcp_ddns_cb_t *, int, const u_int8_t *, unsigned);
void dhcid_tolease (struct data_string *, struct data_string *);
isc_result_t dhcid_fromlease (struct data_string *, struct data_string *);
isc_result_t ddns_update_fwd(struct data_string *, struct iaddr,
@@ -2937,6 +2924,16 @@ isc_result_t ddns_remove_fwd(struct data_string *,
struct iaddr, struct data_string *);
#endif /* NSUPDATE */
+dhcp_ddns_cb_t *ddns_cb_alloc(const char *file, int line);
+void ddns_cb_free (dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
+void ddns_cb_forget_zone (dhcp_ddns_cb_t *ddns_cb);
+isc_result_t
+ddns_modify_fwd(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
+isc_result_t
+ddns_modify_ptr(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
+void
+ddns_cancel(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
+
/* resolv.c */
extern char path_resolv_conf [];
extern struct name_server *name_servers;
@@ -3302,21 +3299,6 @@ void dump_subnets (void);
void free_everything (void);
#endif
-/* nsupdate.c */
-char *ddns_rev_name (struct lease *, struct lease_state *, struct packet *);
-char *ddns_fwd_name (struct lease *, struct lease_state *, struct packet *);
-int nsupdateA (const char *, const unsigned char *, u_int32_t, int);
-int nsupdatePTR (const char *, const unsigned char *, u_int32_t, int);
-void nsupdate (struct lease *, struct lease_state *, struct packet *, int);
-int updateA (const struct data_string *, const struct data_string *,
- unsigned int, struct lease *);
-int updatePTR (const struct data_string *, const struct data_string *,
- unsigned int, struct lease *);
-int deleteA (const struct data_string *, const struct data_string *,
- struct lease *);
-int deletePTR (const struct data_string *, const struct data_string *,
- struct lease *);
-
/* failover.c */
#if defined (FAILOVER_PROTOCOL)
extern dhcp_failover_state_t *failover_states;
@@ -3576,20 +3558,5 @@ void mark_hosts_unavailable(void);
void mark_phosts_unavailable(void);
void mark_interfaces_unavailable(void);
-dhcp_ddns_cb_t *ddns_cb_alloc(const char *file, int line);
-void ddns_cb_free (dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
-void ddns_cb_forget_zone (dhcp_ddns_cb_t *ddns_cb);
-
-//void *key_from_zone(struct dns_zone *zone);
-
-isc_result_t
-ddns_modify_fwd(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
-
-isc_result_t
-ddns_modify_ptr(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
-
-void
-ddns_cancel(dhcp_ddns_cb_t *ddns_cb, const char *file, int line);
-
#define MAX_ADDRESS_STRING_LEN \
(sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"))
diff --git a/includes/dhctoken.h b/includes/dhctoken.h
index 3d9a21d..a75eb97 100644
--- a/includes/dhctoken.h
+++ b/includes/dhctoken.h
@@ -32,6 +32,11 @@
* ``http://www.nominum.com''.
*/
+/*
+ * The following tokens have been deprecated and aren't in use anymore.
+ * They have been left in place to avoid disturbing the code.
+ * DNS_UPDATE, DNS_DELETE, NS_UPDATE, UPDATED_DNS_RR
+ */
enum dhcp_token {
SEMI = ';',
DOT = '.',
diff --git a/includes/site.h b/includes/site.h
index 8ff2834..1c7ec96 100644
--- a/includes/site.h
+++ b/includes/site.h
@@ -281,3 +281,17 @@
limit the number of TCP connections that the server will
allow at one time. A value of 0 means there is no limit.*/
#define MAX_FD_VALUE 200
+
+
+/* Include code to do a slow transition of DDNS records
+ from the interim to the standard version, or backwards.
+ The normal code will handle removing an old style record
+ when the name on a lease is being changed. This adds code
+ to handle the case where the name isn't being changed but
+ the old record should be removed to allow a new record to
+ be added. This is the slow transition as leases are only
+ updated as a client touches them. A fast transition would
+ entail updating all the records at once, probably at start
+ up. */
+#define DDNS_UPDATE_SLOW_TRANSITION
+
diff --git a/includes/tree.h b/includes/tree.h
index 291c0f6..746d31c 100644
--- a/includes/tree.h
+++ b/includes/tree.h
@@ -116,9 +116,6 @@ struct binding_value {
struct data_string data;
unsigned long intval;
int boolean;
-#if defined (NSUPDATE_OLD)
- ns_updrec *dns;
-#endif
struct fundef *fundef;
struct binding_value *bv;
} value;
diff --git a/server/ddns.c b/server/ddns.c
index 2a64bc9..3cf15ce 100644
--- a/server/ddns.c
+++ b/server/ddns.c
@@ -36,6 +36,9 @@
#include "dhcpd.h"
#include <dns/result.h>
+char *ddns_standard_tag = "ddns-dhcid";
+char *ddns_interim_tag = "ddns-txt";
+
#ifdef NSUPDATE
static void ddns_fwd_srv_connector(struct lease *lease,
@@ -71,16 +74,13 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
struct data_string ddns_domainname;
struct data_string old_ddns_fwd_name;
struct data_string ddns_fwd_name;
- //struct data_string ddns_rev_name;
struct data_string ddns_dhcid;
struct binding_scope **scope = NULL;
- //struct iaddr addr;
struct data_string d1;
struct option_cache *oc;
int s1, s2;
int result = 0;
int server_updates_a = 1;
- //int server_updates_ptr = 1;
struct buffer *bp = (struct buffer *)0;
int ignorep = 0, client_ignorep = 0;
int rev_name_len;
@@ -89,8 +89,9 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
dhcp_ddns_cb_t *ddns_cb;
int do_remove = 0;
- if (ddns_update_style != 2)
- return 0;
+ if ((ddns_update_style != DDNS_UPDATE_STYLE_STANDARD) &&
+ (ddns_update_style != DDNS_UPDATE_STYLE_INTERIM))
+ return (0);
/*
* sigh, I want to cancel any previous udpates before we do anything
@@ -149,7 +150,6 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
memset (&ddns_domainname, 0, sizeof (ddns_domainname));
memset (&old_ddns_fwd_name, 0, sizeof (ddns_fwd_name));
memset (&ddns_fwd_name, 0, sizeof (ddns_fwd_name));
- //memset (&ddns_rev_name, 0, sizeof (ddns_rev_name));
memset (&ddns_dhcid, 0, sizeof (ddns_dhcid));
/* If we are allowed to accept the client's update of its own A
@@ -263,31 +263,22 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
goto in;
}
- /* See if there's a DHCID on the lease, and if not
- * then potentially look for 'on events' for ad-hoc ddns.
+#if defined (DDNS_UPDATE_SLOW_TRANSITION)
+ /*
+ * If the slow transition code is enabled check to see
+ * if the stored type (standard or interim doesn't
+ * match the type currently in use. If it doesn't
+ * try to remove and replace the DNS record
*/
- if (!find_bound_string(&ddns_dhcid, *scope, "ddns-txt") &&
- (old != NULL)) {
- /* If there's no DHCID, the update was probably
- done with the old-style ad-hoc DDNS updates.
- So if the expiry and release events look like
- they're the same, run them. This should delete
- the old DDNS data. */
- if (old -> on_expiry == old -> on_release) {
- execute_statements(NULL, NULL, lease, NULL,
- NULL, NULL, scope,
- old->on_expiry);
- if (old -> on_expiry)
- executable_statement_dereference
- (&old -> on_expiry, MDL);
- if (old -> on_release)
- executable_statement_dereference
- (&old -> on_release, MDL);
- /* Now, install the DDNS data the new way. */
- goto in;
- }
- } else
+ if (((ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) &&
+ find_bound_string(&ddns_dhcid, *scope, ddns_interim_tag)) ||
+ ((ddns_update_style == DDNS_UPDATE_STYLE_INTERIM) &&
+ find_bound_string(&ddns_dhcid, *scope, ddns_standard_tag))) {
data_string_forget(&ddns_dhcid, MDL);
+ do_remove = 1;
+ goto in;
+ }
+#endif
/* See if the administrator wants to do updates even
in cases where the update already appears to have been
@@ -486,22 +477,68 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
}
/*
+ * copy the string now so we can pass it to the dhcid routines
+ * via the ddns_cb pointer
+ */
+ data_string_copy(&ddns_cb->fwd_name, &ddns_fwd_name, MDL);
+
+ /*
* If we are updating the A record, compute the DHCID value.
+ * We have two options for computing the DHCID value, the older
+ * interim version and the newer standard version. The interim
+ * has some issues but is left as is to avoid compatibility issues.
+ *
+ * We select the type of DHCID to construct and the information to
+ * use for the digest based on 4701 section 3.3
*/
if ((ddns_cb->flags & DDNS_UPDATE_ADDR) != 0) {
- if (lease6 != NULL)
- result = get_dhcid(&ddns_cb->dhcid, 2,
- lease6->ia->iaid_duid.data,
- lease6->ia->iaid_duid.len);
- else if ((lease != NULL) && (lease->uid != NULL) &&
- (lease->uid_len != 0))
- result = get_dhcid (&ddns_cb->dhcid,
- DHO_DHCP_CLIENT_IDENTIFIER,
- lease -> uid, lease -> uid_len);
- else if (lease != NULL)
- result = get_dhcid (&ddns_cb->dhcid, 0,
- lease -> hardware_addr.hbuf,
- lease -> hardware_addr.hlen);
+ int ddns_type;
+ int ddns_len;
+ if (ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) {
+ /* The standard style */
+ ddns_cb->lease_tag = ddns_standard_tag;
+ ddns_cb->dhcid_class = dns_rdatatype_dhcid;
+ ddns_type = 1;
+ ddns_len = 4;
+ } else {
+ /* The older interim style */
+ ddns_cb->lease_tag = ddns_interim_tag;
+ ddns_cb->dhcid_class = dns_rdatatype_txt;
+ /* for backwards compatibility */
+ ddns_type = DHO_DHCP_CLIENT_IDENTIFIER;
+ /* IAID incorrectly included */
+ ddns_len = 0;
+ }
+
+
+ if (lease6 != NULL) {
+ if (lease6->ia->iaid_duid.len < ddns_len)
+ goto badfqdn;
+ result = get_dhcid(ddns_cb, 2,
+ lease6->ia->iaid_duid.data + ddns_len,
+ lease6->ia->iaid_duid.len - ddns_len);
+ } else if ((lease != NULL) &&
+ (lease->uid != NULL) &&
+ (lease->uid_len != 0)) {
+ /* If this is standard check for an RFC 4361
+ * compliant client identifier
+ */
+ if ((ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) &&
+ (lease->uid[0] == 255)) {
+ if (lease->uid_len < 5)
+ goto badfqdn;
+ result = get_dhcid(ddns_cb, 2,
+ lease->uid + 5,
+ lease->uid_len - 5);
+ } else {
+ result = get_dhcid(ddns_cb, ddns_type,
+ lease->uid,
+ lease->uid_len);
+ }
+ } else if (lease != NULL)
+ result = get_dhcid(ddns_cb, 0,
+ lease->hardware_addr.hbuf,
+ lease->hardware_addr.hlen);
else
log_fatal("Impossible condition at %s:%d.", MDL);
@@ -513,8 +550,6 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
* Perform updates.
*/
- data_string_copy(&ddns_cb->fwd_name, &ddns_fwd_name, MDL);
-
if (ddns_cb->flags && DDNS_UPDATE_ADDR) {
oc = lookup_option(&server_universe, options,
SV_DDNS_CONFLICT_DETECT);
@@ -707,8 +742,6 @@ ddns_updates(struct packet *packet, struct lease *lease, struct lease *old,
data_string_forget(&ddns_domainname, MDL);
data_string_forget(&old_ddns_fwd_name, MDL);
data_string_forget(&ddns_fwd_name, MDL);
- //data_string_forget(&ddns_rev_name, MDL);
- //data_string_forget(&ddns_dhcid, MDL);
if (bp)
buffer_dereference(&bp, MDL);
@@ -822,18 +855,21 @@ ddns_update_lease_text(dhcp_ddns_cb_t *ddns_cb,
case DDNS_STATE_ADD_FW_NXDOMAIN:
bind_ds_value(scope, "ddns-fwd-name", &ddns_cb->fwd_name);
- /* convert from dns version to lease version of dhcid */
- memset(&lease_dhcid, 0, sizeof(lease_dhcid));
- dhcid_tolease(&ddns_cb->dhcid, &lease_dhcid);
- bind_ds_value(scope, "ddns-txt", &lease_dhcid);
- data_string_forget(&lease_dhcid, MDL);
-
+ if (ddns_cb->lease_tag == ddns_standard_tag) {
+ bind_ds_value(scope, ddns_standard_tag, &ddns_cb->dhcid);
+ } else {
+ /* convert from dns version to lease version of dhcid */
+ memset(&lease_dhcid, 0, sizeof(lease_dhcid));
+ dhcid_tolease(&ddns_cb->dhcid, &lease_dhcid);
+ bind_ds_value(scope, ddns_interim_tag, &lease_dhcid);
+ data_string_forget(&lease_dhcid, MDL);
+ }
break;
case DDNS_STATE_REM_FW_NXRR:
case DDNS_STATE_REM_FW_YXDHCID:
unset(*scope, "ddns-fwd-name");
- unset(*scope, "ddns-txt");
+ unset(*scope, ddns_cb->lease_tag);
break;
}
@@ -1791,7 +1827,8 @@ ddns_removals(struct lease *lease,
if (*scope == NULL)
goto cleanup;
- if (ddns_update_style != 2)
+ if ((ddns_update_style != DDNS_UPDATE_STYLE_STANDARD) &&
+ (ddns_update_style != DDNS_UPDATE_STYLE_INTERIM))
goto cleanup;
/* Assume that we are removing both records */
@@ -1823,15 +1860,22 @@ ddns_removals(struct lease *lease,
}
/*
- * Find the ptr name and copy it to the control block. If we don't
- * have it this isn't an interim or rfc3??? record so we can't delete
+ * Find the txt or dhcid tag and copy it to the control block. If we don't
+ * have one this isn't an interim or standard record so we can't delete
* the A record using this mechanism but we can delete the ptr record.
* In this case we will attempt to do any requested next step.
*/
memset(&leaseid, 0, sizeof(leaseid));
- if (!find_bound_string (&leaseid, *scope, "ddns-txt")) {
- ddns_cb->flags &= ~DDNS_UPDATE_ADDR;
- } else {
+ if (find_bound_string (&leaseid, *scope, ddns_standard_tag)) {
+ /* We have a standard tag */
+ ddns_cb->lease_tag = ddns_standard_tag;
+ ddns_cb->dhcid_class = dns_rdatatype_dhcid;
+ data_string_copy(&ddns_cb->dhcid, &leaseid, MDL);
+ data_string_forget(&leaseid, MDL);
+ } else if (find_bound_string (&leaseid, *scope, ddns_interim_tag)) {
+ /* we have an interim tag */
+ ddns_cb->lease_tag = ddns_interim_tag;
+ ddns_cb->dhcid_class = dns_rdatatype_txt;
if (dhcid_fromlease(&ddns_cb->dhcid, &leaseid) !=
ISC_R_SUCCESS) {
/* We couldn't convert the dhcid from the lease
@@ -1841,7 +1885,9 @@ ddns_removals(struct lease *lease,
ddns_cb->flags &= ~DDNS_UPDATE_ADDR;
}
data_string_forget(&leaseid, MDL);
- }
+ } else {
+ ddns_cb->flags &= ~DDNS_UPDATE_ADDR;
+ }
/*
* Find the rev name and copy it to the control block. If we don't
@@ -1888,7 +1934,7 @@ ddns_removals(struct lease *lease,
else {
/*remove info from scope */
unset(*scope, "ddns-fwd-name");
- unset(*scope, "ddns-txt");
+ unset(*scope, ddns_cb->lease_tag);
}
}
diff --git a/server/dhcpd.c b/server/dhcpd.c
index 67fec83..9617d75 100644
--- a/server/dhcpd.c
+++ b/server/dhcpd.c
@@ -82,86 +82,6 @@ option server.ddns-hostname = \n\
option server.ddns-domainname = config-option domain-name; \n\
option server.ddns-rev-domainname = \"in-addr.arpa.\";";
-/* This is the old-style name service updater that is executed
- whenever a lease is committed. It does not follow the DHCP-DNS
- draft at all. */
-
-char old_nsupdate [] = " \n\
-on commit { \n\
- if (not static and \n\
- ((config-option server.ddns-updates = null) or \n\
- (config-option server.ddns-updates != 0))) { \n\
- set new-ddns-fwd-name = \n\
- concat (pick (config-option server.ddns-hostname, \n\
- option host-name), \".\", \n\
- pick (config-option server.ddns-domainname, \n\
- config-option domain-name)); \n\
- if (defined (ddns-fwd-name) and ddns-fwd-name != new-ddns-fwd-name) { \n\
- switch (ns-update (delete (IN, A, ddns-fwd-name, leased-address))) { \n\
- case NOERROR: \n\
- unset ddns-fwd-name; \n\
- on expiry or release { \n\
- } \n\
- } \n\
- } \n\
- \n\
- if (not defined (ddns-fwd-name)) { \n\
- set ddns-fwd-name = new-ddns-fwd-name; \n\
- if defined (ddns-fwd-name) { \n\
- switch (ns-update (not exists (IN, A, ddns-fwd-name, null), \n\
- add (IN, A, ddns-fwd-name, leased-address, \n\
- lease-time / 2))) { \n\
- default: \n\
- unset ddns-fwd-name; \n\
- break; \n\
- \n\
- case NOERROR: \n\
- set ddns-rev-name = \n\
- concat (binary-to-ascii (10, 8, \".\", \n\
- reverse (1, \n\
- leased-address)), \".\", \n\
- pick (config-option server.ddns-rev-domainname, \n\
- \"in-addr.arpa.\")); \n\
- switch (ns-update (delete (IN, PTR, ddns-rev-name, null), \n\
- add (IN, PTR, ddns-rev-name, ddns-fwd-name, \n\
- lease-time / 2))) \n\
- { \n\
- default: \n\
- unset ddns-rev-name; \n\
- on release or expiry { \n\
- switch (ns-update (delete (IN, A, ddns-fwd-name, \n\
- leased-address))) { \n\
- case NOERROR: \n\
- unset ddns-fwd-name; \n\
- break; \n\
- } \n\
- on release or expiry; \n\
- } \n\
- break; \n\
- \n\
- case NOERROR: \n\
- on release or expiry { \n\
- switch (ns-update (delete (IN, PTR, ddns-rev-name, null))) {\n\
- case NOERROR: \n\
- unset ddns-rev-name; \n\
- break; \n\
- } \n\
- switch (ns-update (delete (IN, A, ddns-fwd-name, \n\
- leased-address))) { \n\
- case NOERROR: \n\
- unset ddns-fwd-name; \n\
- break; \n\
- } \n\
- on release or expiry; \n\
- } \n\
- } \n\
- } \n\
- } \n\
- } \n\
- unset new-ddns-fwd-name; \n\
- } \n\
-}";
-
#endif /* NSUPDATE */
int ddns_update_style;
@@ -897,9 +817,6 @@ void postconf_initialization (int quiet)
struct option_cache *oc;
char *s;
isc_result_t result;
-#if defined (NSUPDATE)
- struct parse *parse;
-#endif
int tmp;
/* Now try to get the lease file name. */
@@ -1160,49 +1077,6 @@ void postconf_initialization (int quiet)
/* Don't need the options anymore. */
option_state_dereference (&options, MDL);
-
-#if defined (NSUPDATE)
- /* If old-style ddns updates have been requested, parse the
- old-style ddns updater. */
- if (ddns_update_style == 1) {
- struct executable_statement **e, *s;
-
- if (root_group -> statements) {
- s = (struct executable_statement *)0;
- if (!executable_statement_allocate (&s, MDL))
- log_fatal ("no memory for ddns updater");
- executable_statement_reference
- (&s -> next, root_group -> statements, MDL);
- executable_statement_dereference
- (&root_group -> statements, MDL);
- executable_statement_reference
- (&root_group -> statements, s, MDL);
- s -> op = statements_statement;
- e = &s -> data.statements;
- executable_statement_dereference (&s, MDL);
- } else {
- e = &root_group -> statements;
- }
-
- /* Set up the standard name service updater routine. */
- parse = NULL;
- result = new_parse(&parse, -1, old_nsupdate,
- sizeof(old_nsupdate) - 1,
- "old name service update routine", 0);
- if (result != ISC_R_SUCCESS)
- log_fatal ("can't begin parsing old ddns updater!");
-
- if (parse != NULL) {
- tmp = 0;
- if (!(parse_executable_statements(e, parse, &tmp,
- context_any))) {
- end_parse(&parse);
- log_fatal("can't parse standard ddns updater!");
- }
- }
- end_parse(&parse);
- }
-#endif
}
void postdb_startup (void)
diff --git a/server/dhcpd.conf.5 b/server/dhcpd.conf.5
index 74393c2..2351e21 100644
--- a/server/dhcpd.conf.5
+++ b/server/dhcpd.conf.5
@@ -1076,115 +1076,24 @@ the Domain Name System to be updated. These updates are RFC 2136
compliant so any DNS server supporting RFC 2136 should be able to
accept updates from the DHCP server.
.PP
-Two DNS update schemes are currently implemented, and another is
-planned. The two that are currently implemented are the ad-hoc DNS
-update mode and the interim DHCP-DNS interaction draft update mode.
-In the future we plan to add a third mode which will be the standard
-DNS update method based on the RFCS for DHCP-DNS interaction and DHCID
-The DHCP server must be configured to use one of the two
-currently-supported methods, or not to do dns updates.
-This can be done with the
+There are two DNS schemes implemented. The interim option is
+based on draft revisions of the DDNS documents while the standard
+option is based on the RFCs for DHCP-DNS interaction and DHCIDs.
+A third option, ad-hoc, was deprecated and has now been removed
+from the code base. The DHCP server must be configured to use
+one of the two currently-supported methods, or not to do DNS updates.
+.PP
+New installations should use the standard option. Older
+installations may want to continue using the interim option for
+backwards compatibility with the DNS database until the database
+can be updated. This can be done with the
.I ddns-update-style
configuration parameter.
-.SH THE AD-HOC DNS UPDATE SCHEME
-The ad-hoc Dynamic DNS update scheme is
-.B now deprecated
-and
-.B
-does not work.
-In future releases of the ISC DHCP server, this scheme will not likely be
-available. The interim scheme works, allows for failover, and should now be
-used. The following description is left here for informational purposes
-only.
-.PP
-The ad-hoc Dynamic DNS update scheme implemented in this version of
-the ISC DHCP server is a prototype design, which does not
-have much to do with the standard update method that is being
-standardized in the IETF DHC working group, but rather implements some
-very basic, yet useful, update capabilities. This mode
-.B does not work
-with the
-.I failover protocol
-because it does not account for the possibility of two different DHCP
-servers updating the same set of DNS records.
-.PP
-For the ad-hoc DNS update method, the client's FQDN is derived in two
-parts. First, the hostname is determined. Then, the domain name is
-determined, and appended to the hostname.
-.PP
-The DHCP server determines the client's hostname by first looking for
-a \fIddns-hostname\fR configuration option, and using that if it is
-present. If no such option is present, the server looks for a
-valid hostname in the FQDN option sent by the client. If one is
-found, it is used; otherwise, if the client sent a host-name option,
-that is used. Otherwise, if there is a host declaration that applies
-to the client, the name from that declaration will be used. If none
-of these applies, the server will not have a hostname for the client,
-and will not be able to do a DNS update.
-.PP
-The domain name is determined from the
-.I ddns-domainname
-configuration option. The default configuration for this option is:
-.nf
-.sp 1
- option server.ddns-domainname = config-option domain-name;
-
-.fi
-So if this configuration option is not configured to a different
-value (over-riding the above default), or if a domain-name option
-has not been configured for the client's scope, then the server will
-not attempt to perform a DNS update.
-.PP
-The client's fully-qualified domain name, derived as we have
-described, is used as the name on which an "A" record will be stored.
-The A record will contain the IP address that the client was assigned
-in its lease. If there is already an A record with the same name in
-the DNS server, no update of either the A or PTR records will occur -
-this prevents a client from claiming that its hostname is the name of
-some network server. For example, if you have a fileserver called
-"fs.sneedville.edu", and the client claims its hostname is "fs", no
-DNS update will be done for that client, and an error message will be
-logged.
-.PP
-If the A record update succeeds, a PTR record update for the assigned
-IP address will be done, pointing to the A record. This update is
-unconditional - it will be done even if another PTR record of the same
-name exists. Since the IP address has been assigned to the DHCP
-server, this should be safe.
-.PP
-Please note that the current implementation assumes clients only have
-a single network interface. A client with two network interfaces
-will see unpredictable behavior. This is considered a bug, and will
-be fixed in a later release. It may be helpful to enable the
-.I one-lease-per-client
-parameter so that roaming clients do not trigger this same behavior.
-.PP
-The DHCP protocol normally involves a four-packet exchange - first the
-client sends a DHCPDISCOVER message, then the server sends a
-DHCPOFFER, then the client sends a DHCPREQUEST, then the server sends
-a DHCPACK. In the current version of the server, the server will do
-a DNS update after it has received the DHCPREQUEST, and before it has
-sent the DHCPACK. It only sends the DNS update if it has not sent
-one for the client's address before, in order to minimize the impact
-on the DHCP server.
-.PP
-When the client's lease expires, the DHCP server (if it is operating
-at the time, or when next it operates) will remove the client's A and
-PTR records from the DNS database. If the client releases its lease
-by sending a DHCPRELEASE message, the server will likewise remove the
-A and PTR records.
-.SH THE INTERIM DNS UPDATE SCHEME
-The interim DNS update scheme operates mostly according to several
-drafts considered by the IETF. While the drafts have since become
-RFCs the code was written before they were finalized and there are
-some differences between our code and the final RFCs. We plan to
-update our code, probably adding a standard DNS update option, at
-some time. The basic framework is similar with the main material
-difference being that a DHCID RR was assigned in the RFCs whereas
-our code continues to use an experimental TXT record. The format
-of the TXT record bears a resemblance to the DHCID RR but it is not
-equivalent (MD5 vs SHA1, field length differences etc).
-The standard RFCs are:
+.SH THE DNS UPDATE SCHEME
+the interim and standard DNS update schemes operate mostly according
+to work from the IETF. The interim version was based on the drafts
+in progress at the time while the standard is based on the completed
+RFCs. The standard RFCs are:
.PP
.nf
.ce 3
@@ -1202,15 +1111,17 @@ draft-ietf-dhc-fqdn-option-??.txt
draft-ietf-dhc-ddns-resolution-??.txt
.fi
.PP
-Because our implementation is slightly different than the standard, we
-will briefly document the operation of this update style here.
+The basic framework for the two schemes is similar with the main
+material difference being that a DHCID RR is used in the standard
+version while the interim versions uses a TXT RR. The format
+of the TXT record bears a resemblance to the DHCID RR but it is not
+equivalent (MD5 vs SHA2, field length differences etc).
.PP
-The first point to understand about this style of DNS update is that
-unlike the ad-hoc style, the DHCP server does not necessarily
+In these two schemes the DHCP server does not necessarily
always update both the A and the PTR records. The FQDN option
includes a flag which, when sent by the client, indicates that the
client wishes to update its own A record. In that case, the server
-can be configured either to honor the client's intentions or ignore
+can be configured either to honor the client\'s intentions or ignore
them. This is done with the statement \fIallow client-updates;\fR or
the statement \fIignore client-updates;\fR. By default, client
updates are allowed.
@@ -1230,15 +1141,14 @@ IP address, it can update its own A record, assuming that the
"radish.org" DNS server will allow it to do so.
.PP
If the server is configured not to allow client updates, or if the
-client doesn't want to do its own update, the server will simply
+client doesn\'t want to do its own update, the server will simply
choose a name for the client from either the fqdn option (if present)
or the hostname option (if present). It will use its own
-domain name for the client, just as in the ad-hoc update scheme.
-It will then update both the A and PTR record, using the name that it
-chose for the client. If the client sends a fully-qualified domain
-name in the fqdn option, the server uses only the leftmost part of the
-domain name - in the example above, "jschmoe" instead of
-"jschmoe.radish.org".
+domain name for the client. It will then update both the A and PTR
+record, using the name that it chose for the client. If the client
+sends a fully-qualified domain name in the \fBfqdn\fR option, the
+server uses only the leftmost part of the domain name - in the
+example above, "jschmoe" instead of "jschmoe.radish.org".
.PP
Further, if the \fIignore client-updates;\fR directive is used, then
the server will in addition send a response in the DHCP packet, using
@@ -1248,49 +1158,41 @@ response is sent which indicates the client may not perform updates.
.PP
Also, if the
.I use-host-decl-names
-configuration option is enabled, then the host declaration's
+configuration option is enabled, then the host declaration\'s
.I hostname
will be used in place of the
.I hostname
option, and the same rules will apply as described above.
.PP
-The other difference between the ad-hoc scheme and the interim
-scheme is that with the interim scheme, a method is used that
-allows more than one DHCP server to update the DNS database without
-accidentally deleting A records that shouldn't be deleted nor failing
-to add A records that should be added. The scheme works as follows:
+Both the standard and interim options also include a method to
+allow more than one DHCP server to update the DNS database without
+accidentally deleting A records that shouldn\'t be deleted nor failing
+to add A records that should be added. For the standard option the
+method works as follows:
.PP
When the DHCP server issues a client a new lease, it creates a text
-string that is an MD5 hash over the DHCP client's identification (see
-draft-ietf-dnsext-dhcid-rr-??.txt for details). The update adds an A
-record with the name the server chose and a TXT record containing the
+string that is an SHA hash over the DHCP client\'s identification (see
+RFCs 4701 & 4702 for details). The update attempts to add an A
+record with the name the server chose and a DHCID record containing the
hashed identifier string (hashid). If this update succeeds, the
server is done.
.PP
If the update fails because the A record already exists, then the DHCP
server attempts to add the A record with the prerequisite that there
-must be a TXT record in the same name as the new A record, and that
-TXT record's contents must be equal to hashid. If this update
+must be a DHCID record in the same name as the new A record, and that
+DHCID record\'s contents must be equal to hashid. If this update
succeeds, then the client has its A record and PTR record. If it
fails, then the name the client has been assigned (or requested) is in
-use, and can't be used by the client. At this point the DHCP server
+use, and can\'t be used by the client. At this point the DHCP server
gives up trying to do a DNS update for the client until the client
chooses a new name.
.PP
-The interim DNS update scheme is called interim for two reasons.
-First, it does not quite follow the RFCs. The RFCs call for a
-new DHCID RRtype while he interim DNS update scheme uses a TXT record.
-The ddns-resolution draft called for the DHCP server to put a DHCID RR
-on the PTR record, but the \fIinterim\fR update method does not do this.
-In the final RFC this requirement was relaxed such that a server may
-add a DHCID RR to the PTR record.
-.PP
-In addition to these differences, the server also does not update very
-aggressively. Because each DNS update involves a round trip to the
-DNS server, there is a cost associated with doing updates even if they
-do not actually modify the DNS database. So the DHCP server tracks
-whether or not it has updated the record in the past (this information
-is stored on the lease) and does not attempt to update records that it
+The server also does not update very aggressively. Because each
+DNS update involves a round trip to the DNS server, there is a cost
+associated with doing updates even if they do not actually modify
+the DNS database. So the DHCP server tracks whether or not it has
+updated the record in the past (this information is stored on the
+lease) and does not attempt to update records that it
thinks it has already updated.
.PP
This can lead to cases where the DHCP server adds a record, and then
@@ -1299,6 +1201,15 @@ never again updates the DNS because it thinks the data is already
there. In this case the data can be removed from the lease through
operator intervention, and once this has been done, the DNS will be
updated the next time the client renews.
+.PP
+The interim DNS update scheme was written before the RFCs were finalized
+and does not quite follow them. The RFCs call for a new DHCID RRtype
+while he interim DNS update scheme uses a TXT record. In addition
+the ddns-resolution draft called for the DHCP server to put a DHCID RR
+on the PTR record, but the \fIinterim\fR update method does not do this.
+In the final RFC this requirement was relaxed such that a server may
+add a DHCID RR to the PTR record.
+.PP
.SH DYNAMIC DNS UPDATE SECURITY
.PP
When you set your DNS server up to allow updates from the DHCP server,
@@ -1380,24 +1291,15 @@ Also keep in mind that zone names in your DHCP configuration should end in a
configuration, zone names are not encapsulated in quotes where there are in
the DNS configuration.
.PP
-You should choose your own secret key, of course. The ISC BIND 8 and
-9 distributions come with a program for generating secret keys called
-dnssec-keygen. The version that comes with BIND 9 is likely to produce a
-substantially more random key, so we recommend you use that one even
-if you are not using BIND 9 as your DNS server. If you are using BIND 9's
+You should choose your own secret key, of course. The ISC BIND 9
+distribution comes with a program for generating secret keys called
+dnssec-keygen. If you are using BIND 9\'s
dnssec-keygen, the above key would be created as follows:
.PP
.nf
dnssec-keygen -a HMAC-MD5 -b 128 -n USER DHCP_UPDATER
.fi
.PP
-If you are using the BIND 8 dnskeygen program, the following command will
-generate a key as seen above:
-.PP
-.nf
- dnskeygen -H 128 -u -c -n DHCP_UPDATER
-.fi
-.PP
The key name, algorithm, and secret must match that being used by the DNS
server. The DHCP server currently supports the following algorithms:
.nf
@@ -1451,15 +1353,7 @@ and the expiry event, when the commitment expires.
To declare a set of statements to execute when an event happens, you
must use the \fBon\fR statement, followed by the name of the event,
followed by a series of statements to execute when the event happens,
-enclosed in braces. Events are used to implement DNS
-updates, so you should not define your own event handlers if you are
-using the built-in DNS update mechanism.
-.PP
-The built-in version of the DNS update mechanism is in a text
-string towards the top of server/dhcpd.c. If you want to use events
-for things other than DNS updates, and you also want DNS updates, you
-will have to start out by copying this code into your dhcpd.conf file
-and modifying it.
+enclosed in braces.
.SH REFERENCE: DECLARATIONS
.PP
.B The
@@ -2109,7 +2003,7 @@ The \fIddns-update-style\fR parameter
.PP
The
.I style
-parameter must be one of \fBad-hoc\fR, \fBinterim\fR or \fBnone\fR.
+parameter must be one of \fBstandard\fR, \fBinterim\fR or \fBnone\fR.
The \fIddns-update-style\fR statement is only meaningful in the outer
scope - it is evaluated once after reading the dhcpd.conf file, rather
than each time a client is assigned an IP address, so there is no way
@@ -2186,16 +2080,15 @@ statement
.B do-forward-updates \fIflag\fB;\fR
.PP
The \fIdo-forward-updates\fR statement instructs the DHCP server as
-to whether it should attempt to update a DHCP client's A record
+to whether it should attempt to update a DHCP client\'s A record
when the client acquires or renews a lease. This statement has no
-effect unless DNS updates are enabled and \fBddns-update-style\fR is
-set to \fBinterim\fR. Forward updates are enabled by default. If
-this statement is used to disable forward updates, the DHCP server
-will never attempt to update the client's A record, and will only ever
-attempt to update the client's PTR record if the client supplies an
-FQDN that should be placed in the PTR record using the fqdn option.
-If forward updates are enabled, the DHCP server will still honor the
-setting of the \fBclient-updates\fR flag.
+effect unless DNS updates are enabled. Forward updates are enabled
+by default. If this statement is used to disable forward updates,
+the DHCP server will never attempt to update the client\'s A record,
+and will only ever attempt to update the client\'s PTR record if the
+client supplies an FQDN that should be placed in the PTR record using
+the \fBfqdn\fR option. If forward updates are enabled, the DHCP server
+will still honor the setting of the \fBclient-updates\fR flag.
.RE
.PP
The
@@ -2747,7 +2640,7 @@ on which the request arrived.
The usual case where the
\fIserver-identifier\fR statement needs to be sent is when a physical
interface has more than one IP address, and the one being sent by default
-isn't appropriate for some or all clients served by that interface.
+isn\'t appropriate for some or all clients served by that interface.
Another common case is when an alias is defined for the purpose of
having a consistent IP address for the DHCP server, and it is desired
that the clients use this IP address when contacting the server.
diff --git a/server/stables.c b/server/stables.c
index 6a900c8..8ef8bf2 100644
--- a/server/stables.c
+++ b/server/stables.c
@@ -3,7 +3,7 @@
Tables of information only used by server... */
/*
- * Copyright (c) 2004-2011 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 2004-2011,2013 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
@@ -330,6 +330,7 @@ struct enumeration_value ddns_styles_values [] = {
{ "none", 0 },
{ "ad-hoc", 1 },
{ "interim", 2 },
+ { "standard", 3 },
{ (char *)0, 0 }
};