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sd-dhcp-client: reject NAKs from servers that we did not send an offer to (#29290)

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To support multiple DHCP servers in a network.
This commit is contained in:
Alexandre Peixoto Ferreira
2023-09-25 11:46:41 +09:00
committed by GitHub
parent fb86af6399
commit 13abd00685
1 changed files with 6 additions and 1 deletions
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src/libsystemd-network/sd-dhcp-client.c
+6 -1
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@@ -1591,9 +1591,14 @@ static int client_parse_message(
case DHCP_STATE_REQUESTING:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
if (r == DHCP_NAK)
if (r == DHCP_NAK) {
if (client->lease && client->lease->server_address != lease->server_address)
return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(ENOMSG),
"NAK from unexpected server, ignoring: %s",
strna(error_message));
return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
"NAK: %s", strna(error_message));
}
if (r != DHCP_ACK)
return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(ENOMSG),
"received message was not an ACK, ignoring.");