Re: ISC dhcpd, etherboot and menues

[Bernd Wiebelt <bernardo@mathematik.hu-berlin.de>]

On Mon, 13 Dec 1999, Ken Yap wrote:

> Yes please. Maybe CC the list to get more eyes on the code. Why do you
> have to program a loop in CPP by the way?

The fix for menue support with DHCP is attached. The etherboot vendor tags
have to be added to the parameter request list in the DHCPREQUEST packet
sent to the dhcp server.

The loop in CPP would be needed to proper support filling the dhcprequest
structure with the (#define'd) number of tags for MOTD and IMAGES, right
now I'm simply adding 8 and 16 entries respectively. 

Also attached is a simple dhcpd.conf to start with, works with dhcpd 2.0
and 3.0 beta.

BTW, /etc/inetd.conf in RedHat 6.1 is flawed. The line for tftpd should be

tftp    dgram   udp     wait    root    /usr/sbin/tcpd  in.tftpd /tftpboot

The "/tftpboot" directory is missing from the original RH61 distribution.
According to "man tftpd" it should be the default, but somehow it
isn't. Maybe it's worth noting this in the etherboot documentation.

BTW, the ISC dhdpd comes with the recent RFC's for dhcp and bootp. It
would be nice if these could be put on the etherboot web-pages or even
included in the package. They are fairly easy to read and were very
helpful for me to fix this problem: rfc951, rfc2131, rfc2132


--- etherboot-4.2.12.org/src-32/main.c	Thu Dec  9 15:29:18 1999
+++ etherboot-4.2.12/src-32/main.c	Tue Dec 14 14:49:27 1999
@@ -49,16 +49,54 @@
 #else
 char    rfc1533_cookie[] = { RFC1533_COOKIE};
 char    rfc1533_end[]={RFC1533_END };
-char    dhcpdiscover[]={RFC2132_MSG_TYPE,1,DHCPDISCOVER,
-			RFC2132_MAX_SIZE,2,2,64,
-			RFC2132_PARAM_LIST,4,RFC1533_NETMASK,RFC1533_GATEWAY,
-					    RFC1533_HOSTNAME,RFC1533_EXTENSIONPATH};
-char    dhcprequest []={RFC2132_MSG_TYPE,1,DHCPREQUEST,
-			RFC2132_SRV_ID,4,0,0,0,0,
-			RFC2132_REQ_ADDR,4,0,0,0,0,
-			RFC2132_MAX_SIZE,2,2,64,
-			RFC2132_PARAM_LIST,4,RFC1533_NETMASK,RFC1533_GATEWAY,
-					    RFC1533_HOSTNAME,RFC1533_EXTENSIONPATH};
+char    dhcpdiscover[]={
+		RFC2132_MSG_TYPE,1,DHCPDISCOVER,
+		RFC2132_MAX_SIZE,2,2,64,
+		RFC2132_PARAM_LIST,4,RFC1533_NETMASK,RFC1533_GATEWAY,
+		RFC1533_HOSTNAME,RFC1533_EXTENSIONPATH
+	};
+char    dhcprequest []={
+		RFC2132_MSG_TYPE,1,DHCPREQUEST,
+		RFC2132_SRV_ID,4,0,0,0,0,
+		RFC2132_REQ_ADDR,4,0,0,0,0,
+		RFC2132_MAX_SIZE,2,2,64,
+		/* request parameters */
+		RFC2132_PARAM_LIST,
+		/* 4 standard + 4 vendortags + 8 motd + 16 menu items */
+		4 + 4 + 8 + 16,
+		/* Standard parameters */
+		RFC1533_NETMASK, RFC1533_GATEWAY,
+		RFC1533_HOSTNAME, RFC1533_EXTENSIONPATH,
+		/* Etherboot vendortags */ 
+		RFC1533_VENDOR_MAGIC, RFC1533_VENDOR_HOWTO,
+		RFC1533_VENDOR_MNUOPTS, RFC1533_VENDOR_SELECTION,
+		/* 8 MOTD entries */
+		RFC1533_VENDOR_MOTD,
+		RFC1533_VENDOR_MOTD+1,
+		RFC1533_VENDOR_MOTD+2,
+		RFC1533_VENDOR_MOTD+3,
+		RFC1533_VENDOR_MOTD+4,
+		RFC1533_VENDOR_MOTD+5,
+		RFC1533_VENDOR_MOTD+6,
+		RFC1533_VENDOR_MOTD+7,
+		/* 16 image entries */
+		RFC1533_VENDOR_IMG,
+		RFC1533_VENDOR_IMG+1,
+		RFC1533_VENDOR_IMG+2,
+		RFC1533_VENDOR_IMG+3,
+		RFC1533_VENDOR_IMG+4,
+		RFC1533_VENDOR_IMG+5,
+		RFC1533_VENDOR_IMG+6,
+		RFC1533_VENDOR_IMG+7,
+		RFC1533_VENDOR_IMG+8,
+ 		RFC1533_VENDOR_IMG+9,
+ 		RFC1533_VENDOR_IMG+10,
+		RFC1533_VENDOR_IMG+11,
+		RFC1533_VENDOR_IMG+12,
+		RFC1533_VENDOR_IMG+13,
+		RFC1533_VENDOR_IMG+14,
+		RFC1533_VENDOR_IMG+15,
+	};
 
 #endif /* NO_DHCP_SUPPORT */
 char	broadcast[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };



subnet 10.97.0.0 netmask 255.255.0.0 {
	range 10.97.0.2 10.97.0.254;
	option option-128  e4:45:74:68:0:0;
	option option-160 "default=193";
	option option-184  "HALLO";
       	option option-192 "Linux:::linux.tagged:";
	option option-193 "DOS Bootdisk:::dosboot.tagged";
	option option-194 "RH61 Bootdisk:::boot.tagged";
	option option-195 "Local Disk:::/dev/hda:85b103482a20682da703aa388933a6d8";
}