[dhcp] Use a default user-class of "gPXE"

This change makes it possible to break the PXE-chaining infinite loop
even when restricted to a Windows DHCP server.

diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index 776635c..ab843ce 100644 (file)
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -77,6 +77,8 @@ static uint8_t dhcp_request_options_data[] = {
        DHCP_STRING (  'P', 'X', 'E', 'C', 'l', 'i', 'e', 'n', 't', ':',
                       'A', 'r', 'c', 'h', ':', '0', '0', '0', '0', '0', ':',
                       'U', 'N', 'D', 'I', ':', '0', '0', '2', '0', '0', '1' ),
+       DHCP_USER_CLASS_ID,
+       DHCP_STRING ( 'g', 'P', 'X', 'E' ),
        DHCP_PARAMETER_REQUEST_LIST,
        DHCP_OPTION ( DHCP_SUBNET_MASK, DHCP_ROUTERS, DHCP_DNS_SERVERS,
                      DHCP_LOG_SERVERS, DHCP_HOST_NAME, DHCP_DOMAIN_NAME,