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sd-dhcp-server: also send DNS servers or friends on DHCPOFFER

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From RFC 2131 section 4.3.1 (https://www.rfc-editor.org/rfc/rfc2131#section-4.3.1):
----
The server MUST return to the client:
- Parameters requested by the client, according to the following rules:
  -- IF the server has been explicitly configured with a default
     value for the parameter, the server MUST include that value
     in an appropriate option in the 'option' field,
----
The sentence is not only for ACK, but for all (positive) responses, that
is DHCPOFFER and DHCPACK.

Fixes #27471.
This commit is contained in:
Yu Watanabe 2023-05-11 16:42:27 +09:00 committed by Luca Boccassi
parent d5e6c4be91
commit 0c3ea0c222
1 changed files with 27 additions and 30 deletions
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57
src/libsystemd-network/sd-dhcp-server.c
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@ -564,6 +564,15 @@ static int server_send_offer_or_ack(
be32_t address,
uint8_t type) {
static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = {
[SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER,
[SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER,
[SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER,
[SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER,
[SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER,
[SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER,
};
_cleanup_free_ DHCPPacket *packet = NULL;
sd_dhcp_option *j;
be32_t lease_time;
@ -619,38 +628,26 @@ static int server_send_offer_or_ack(
return r;
}
if (type == DHCP_ACK) {
static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = {
[SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER,
[SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER,
[SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER,
[SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER,
[SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER,
[SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER,
};
for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) {
if (server->servers[k].size <= 0)
continue;
for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) {
if (server->servers[k].size <= 0)
continue;
r = dhcp_option_append(
&packet->dhcp, req->max_optlen, &offset, 0,
option_map[k],
sizeof(struct in_addr) * server->servers[k].size,
server->servers[k].addr);
if (r < 0)
return r;
}
r = dhcp_option_append(
&packet->dhcp, req->max_optlen, &offset, 0,
option_map[k],
sizeof(struct in_addr) * server->servers[k].size,
server->servers[k].addr);
if (r < 0)
return r;
}
if (server->timezone) {
r = dhcp_option_append(
&packet->dhcp, req->max_optlen, &offset, 0,
SD_DHCP_OPTION_TZDB_TIMEZONE,
strlen(server->timezone), server->timezone);
if (r < 0)
return r;
}
if (server->timezone) {
r = dhcp_option_append(
&packet->dhcp, req->max_optlen, &offset, 0,
SD_DHCP_OPTION_TZDB_TIMEZONE,
strlen(server->timezone), server->timezone);
if (r < 0)
return r;
}
ORDERED_SET_FOREACH(j, server->extra_options) {