pxechn.c32: PXE NBP chainloader

Designed as a more versatile COM32-based alternative to pxechain.com.
It can use the PXE RESTART or chain to the new NBP without the PXE
stack.  It also enables a user to boot Microsoft Windows Server 2008R2
Windows Deployment Services's wdsnbp.com from PXELINUX.

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

1 files changed, 94 insertions, 0 deletions

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+= pxechn.c32 =
+:doctype: manpage
+:author: Gene Cumm
+:email: gene.cumm@gmail.com
+:revdate: 2012-05-27
+
+
+== NAME ==
+pxechn.c32 - Chainboot to new NBP
+
+
+== SYNOPSIS ==
+*pxechn.c32* [-h | --help | -?]
+*pxechn.c32* -r 'FILE'
+*pxechn.c32* 'FILE' ['OPTIONS']
+
+
+== DESCRIPTION ==
+Chainboot to a new NBP (Network Boot Program) 'FILE' with options to adjust PXE packet #3 (PXENV_PACKET_TYPE_CACHED_REPLY) to alter end behavior.  'FILE' may be a filename, an IP::FN ( 192.168.1.1::path/to/file.0 ), or URL.  'FILE' is parsed to adjust the DHCP 'sname' field/option 66 and 'file' field/option 67.
+// but these may be override-able in the future.
+
+
+== OPTIONS ==
+*-c* 'CONFIG'::
+    PXELINUX config file (DHCP Option 209).
+
+// *-f* 'MOD'::
+//     Force behavior specified by 'MOD'
+//
+// *-g* 'HOST'::
+//     Set DHCP gateway/relay.  Parsed by pxe_dns().
+//
+*-h*, *--help*, *-?*::
+    Print usage information; invalid options will also cause this.
+
+// *-n*::
+//     Use native methods, ignoring underlying gPXE/iPXE.
+// 
+// *-N*::
+//     Use non-native methods to utilize gPXE/iPXE (if available).
+//
+*-o* 'OPT.TYPE=VALUE'::
+    Specify a generic option.  'OPT' is in 'DECIMAL INPUT' format (below).  'TYPE' specifies the output type and input syntax.  'b'yte, 'w'ord(2B), 'l'ong(4B), 'q'uad(8B), character 's'tring and colon-separated he'x' string (case insensitive; bytes must have 2 digits and each byte must be separated).  byte, word, long and quad input values must meet criteria for 'DECIMAL INPUT'
+
+*-p* 'PATH'::
+    PXELINUX path (DHCP Option 210).
+
+*-r*::
+    Call the PXE stack with PXENV_RESTART_TFTP.  _Must_ be the only option and before 'FILE'.
+
+*-t* 'SECONDS'::
+    PXELINUX timeout (DHCP Option 211).
+
+// *-u*::
+//     Copy UUID (Option 97) if found in packet #1
+
+*-w*::
+    wait after loading before booting for user input.
+
+*-W*::
+    Enable WDS (Windows Deployment Services) - specific options.
+
+
+== DECIMAL INPUT ==
+All parameters that are defaulted to decimal format are processed by *strtoul*(3) with a base of 0 which allows alternate formats and finds a suitable non-space separating character.
+
+
+== EXAMPLES ==
+pxechn.c32 http://myhost.dom.loc/path/nbp.0 -c myconfig
+	Load nbp.0 and set PXELINUX config (option 209).
+
+pxechn.c32 gpxelinux.0 -p http://172.16.23.1/tftp/ -w -c myconfig -o 15.s=domain.loc -o 6.x=0A:01:01:02:ac:17:4D:Ec -
+	Load gpxelinux.0 from the current directory, set prefix, wait to execute, set first config, set the domain name and 2 domain name servers (case mixed to show insensitivity; 10.1.1.2 and 172.23.77.236).
+
+pxechn.c32 gpxelinux.0 -p http://172.16.23.1/tftp/ -w -X A012345678 -x 197:00d0de00
+pxechn.c32 gpxelinux.0 -p http://172.16.23.1/tftp/ -w -X A012:3456:78 -x 197:00-d0-de-00
+	Both of these are equivalent.  Load gpxelinux.0 (relative to the current directory and not altering sname/option 66), set the PXELINUX path prefix, wait after loading, set option 160 to 0x12 0x34 0x56 0x78, and option 197 to 0x00 0xD0 0xDE 0x00.
+
+
+== NOTES ==
+Please note that some NBPs may ignore packet #3 by either not examining it at all or by issuing its own DHCP DISCOVER/REQUEST, negating all DHCP field/option modifications by pxechn.c32.
+
+URL specifications in 'FILE' that include user/password before the host will currently cause the siaddr field to not be set properly.
+
+The non-space constraint is due to how Syslinux variants parse the command line as of 2012-01-12.
+
+
+== AUTHOR ==
+{author} <{email}>
+
+
+== COPYRIGHT ==
+Copyright \(C) 2012 {author}. Free use of this software is granted under
+the terms of the GNU General Public License (GPL).