When a DHCP Nak is received, return a DHCP_EVENT_NO_LEASE event. If
some other DHCP message is received or an error happens when parsing
options, return -ENOMSG in order to ignore the packet. There may be
more than one server serving the same subnet, each server will send
its Offer to the client.
---
src/libsystemd-dhcp/dhcp-client.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/libsystemd-dhcp/dhcp-client.c
b/src/libsystemd-dhcp/dhcp-client.c
index 18a6e3c..7dc1546 100644
--- a/src/libsystemd-dhcp/dhcp-client.c
+++ b/src/libsystemd-dhcp/dhcp-client.c
@@ -731,8 +731,15 @@ static int client_receive_ack(sd_dhcp_client *client,
DHCPPacket *offer,
len = len - DHCP_IP_UDP_SIZE;
r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer, lease);
- if (r != DHCP_ACK)
+ if (r == DHCP_NAK) {
+ r = DHCP_EVENT_NO_LEASE;
goto error;
+ }
+
+ if (r != DHCP_ACK) {
+ r = -ENOMSG;
+ goto error;
+ }
lease->address = offer->dhcp.yiaddr;
--
1.7.10.4
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