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sd-dhcp6: Support deprecated SNTP Configuration Option

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Although the SNTP option specified in RFC 4075 has been deprecated, some
servers are still sending NTP information with this option. Use the SNTP
information provided only if the NTP option is not present.

Update the test case as SNTP information is also requested.
This commit is contained in:
Patrik Flykt 2015-04-10 16:17:22 +03:00
parent 6599680e2d
commit 41e4615d4f
5 changed files with 48 additions and 2 deletions
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2
src/libsystemd-network/dhcp6-lease-internal.h
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@ -71,6 +71,8 @@ int dhcp6_lease_set_dns(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen);
int dhcp6_lease_set_domains(sd_dhcp6_lease *lease, uint8_t *optval,
size_t optlen);
int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen);
int dhcp6_lease_set_sntp(sd_dhcp6_lease *lease, uint8_t *optval,
size_t optlen) ;
int dhcp6_lease_new(sd_dhcp6_lease **ret);

2
src/libsystemd-network/dhcp6-protocol.h
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@ -123,7 +123,7 @@ enum {
DHCP6_OPTION_DNS_SERVERS = 23, /* RFC 3646 */
DHCP6_OPTION_DOMAIN_LIST = 24, /* RFC 3646 */
DHCP6_OPTION_SNTP_SERVERS = 31, /* RFC 4075 */
DHCP6_OPTION_SNTP_SERVERS = 31, /* RFC 4075, deprecated */
/* option code 35 is unassigned */

8
src/libsystemd-network/sd-dhcp6-client.c
View File

@ -73,6 +73,7 @@ static const uint16_t default_req_opts[] = {
DHCP6_OPTION_DNS_SERVERS,
DHCP6_OPTION_DOMAIN_LIST,
DHCP6_OPTION_NTP_SERVER,
DHCP6_OPTION_SNTP_SERVERS,
};
const char * dhcp6_message_type_table[_DHCP6_MESSAGE_MAX] = {
@ -774,6 +775,13 @@ static int client_parse_message(sd_dhcp6_client *client,
return r;
break;
case DHCP6_OPTION_SNTP_SERVERS:
r = dhcp6_lease_set_sntp(lease, optval, optlen);
if (r < 0)
return r;
break;
}
}

36
src/libsystemd-network/sd-dhcp6-lease.c
View File

@ -257,6 +257,10 @@ int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen)
assert_return(lease, -EINVAL);
assert_return(optval, -EINVAL);
free(lease->ntp);
lease->ntp_count = 0;
lease->ntp_allocated = 0;
while ((r = dhcp6_option_parse(&optval, &optlen, &subopt, &sublen,
&subval)) >= 0) {
int s;
@ -299,6 +303,38 @@ int dhcp6_lease_set_ntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen)
return 0;
}
int dhcp6_lease_set_sntp(sd_dhcp6_lease *lease, uint8_t *optval, size_t optlen) {
int r;
assert_return(lease, -EINVAL);
assert_return(optval, -EINVAL);
if (!optlen)
return 0;
if (lease->ntp || lease->ntp_fqdn) {
log_dhcp6_client(client, "NTP information already provided");
return 0;
}
log_dhcp6_client(client, "Using deprecated SNTP information");
r = dhcp6_option_parse_ip6addrs(optval, optlen, &lease->ntp,
lease->ntp_count,
&lease->ntp_allocated);
if (r < 0) {
log_dhcp6_client(client, "Invalid SNTP server option: %s",
strerror(-r));
return r;
}
lease->ntp_count = r;
return 0;
}
int sd_dhcp6_lease_get_ntp_addrs(sd_dhcp6_lease *lease,
struct in6_addr **addrs) {
assert_return(lease, -EINVAL);

2
src/libsystemd-network/test-dhcp6-client.c
View File

@ -73,7 +73,7 @@ static int test_client_basic(sd_event *e) {
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_CLIENTID) == -EINVAL);
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_DNS_SERVERS) == -EEXIST);
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_NTP_SERVER) == -EEXIST);
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_SNTP_SERVERS) == 0);
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_SNTP_SERVERS) == -EEXIST);
assert_se(sd_dhcp6_client_set_request_option(client, DHCP6_OPTION_DOMAIN_LIST) == -EEXIST);
assert_se(sd_dhcp6_client_set_request_option(client, 10) == -EINVAL);