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Author Topic: syslinux upgrade for tc4.7.x?  (Read 15489 times)

Offline genec

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Re: syslinux upgrade for tc4.7.x?
« Reply #30 on: June 15, 2013, 07:36:29 AM »
That sounds rather odd (not being able to disable auth).  I can't say I've ever heard of such a thing.  It'd be EXTREMELY suspicious to see an HTTP 401 on public sites.  Most httpds that I've seen are configurable.  Consider the HTTP status code definitions.  4xx are client failure errors where a repeated request won't change anything, unless the request is "corrected" or access on the server is changed.  Adding/changing authentication information is a "correction" in this context.

Not sure what you're asking about pausing since your httpd returns 401 and PXELINUX's HTTP client likely treats it the same as a 404.

To my knowledge, correct.  There is no directive for it.  I also doubt that inserting username/password into the URL the standard manner will do anything but return a complete failure.  I'll try to see if I can get a quick test set up.

You can easily use gPXE/iPXE to provide HTTP access instead of using lpxelinux.0 and it could do authentication.

Offline genec

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Re: syslinux upgrade for tc4.7.x?
« Reply #31 on: June 15, 2013, 08:42:24 AM »
And inserting the authentication information into the URL is parsed but the username/password isn't used ie http://user:password@192.168.4.1/auth/menu.c32.

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #32 on: June 16, 2013, 01:35:39 AM »
That sounds rather odd (not being able to disable auth).  I can't say I've ever heard of such a thing.

The NSLU2 is rather limited in what it allows the end user to configure.  It insists on asking for a user name/password for any access.  Failed logongs are supposed to default to the "guest" account.

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Not sure what you're asking about pausing since your httpd returns 401 and PXELINUX's HTTP client likely treats it the same as a 404.

At the PXE boot menu, when I select an entry from the menu and press Enter, I need to see the response/error message before PXE returns to the menu (assuming a boot failure occures, which it does when trying an http boot).  As it is, I see just the briefest flash of a message and then it is gone and the menu is active again.

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To my knowledge, correct.  There is no directive for it.  I also doubt that inserting username/password into the URL the standard manner will do anything but return a complete failure.  I'll try to see if I can get a quick test set up.

I appreciate that.

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You can easily use gPXE/iPXE to provide HTTP access instead of using lpxelinux.0 and it could do authentication.

I am currently trying that.  So far I just replaced lpxelinux.0 with undionly.kpxe (in udhcpd.conf) per the ipxe setup instructions.  I get the ipxe boot screen and can Ctrl-b to break out of the endless loop (again, per the instructions).  I have not gotten any further yet, still reading.  I was hoping that it would run the 'default' menu by default but it looks like I have to do some more configuration to get to that point.

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #33 on: June 16, 2013, 01:38:48 AM »
And inserting the authentication information into the URL is parsed but the username/password isn't used ie http://user:password@192.168.4.1/auth/menu.c32.

That was the syntax I was needing.  I tried it.  You were right, it did not work.  Back to trying to set up ipxe...

Offline tinypoodle

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Re: syslinux upgrade for tc4.7.x?
« Reply #34 on: June 16, 2013, 02:33:31 AM »
The NSLU2 is rather limited in what it allows the end user to configure.

It would appear like many have improved that:

http://www.nslu2-linux.org/
"Software gets slower faster than hardware gets faster." Niklaus Wirth - A Plea for Lean Software (1995)

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #35 on: June 16, 2013, 02:35:38 AM »
By the way, how do I stop/restart udhcpd?  I have tried stop, start, and restart with what I believe is the correct path, but there is no indication that anything happens, not even an error message.

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #36 on: June 16, 2013, 02:50:39 AM »
The NSLU2 is rather limited in what it allows the end user to configure.

It would appear like many have improved that:

http://www.nslu2-linux.org/

Yes, and I am very interested in going that route.  In fact, this past Friday I received a second, used, NSLU2 I found on Amazon.  I am researching which firmware would be best for my needs.  But it will take time to get that set up so I am continuing to work on the TCL/PXE boot http issue from both angles.

Thanks for the tip.

Offline tinypoodle

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Re: syslinux upgrade for tc4.7.x?
« Reply #37 on: June 16, 2013, 03:06:19 AM »
By the way, how do I stop/restart udhcpd?  I have tried stop, start, and restart with what I believe is the correct path, but there is no indication that anything happens, not even an error message.

A suggestion would be using 'htop', which lets you kill a selected process while providing realtime feedback.
"Software gets slower faster than hardware gets faster." Niklaus Wirth - A Plea for Lean Software (1995)

Offline Juanito

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Re: syslinux upgrade for tc4.7.x?
« Reply #38 on: June 16, 2013, 03:20:29 AM »
Code: [Select]
$ ps aux | grep udhcpc
$ sudo kill xxxx [pid from result of above command]

udhcpc should also create a pid file of the form /var/run/udhcpc.eth1.pid

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #39 on: June 16, 2013, 03:58:11 AM »
Thanks guys. 

I gather that the standard stop/start/restart commands don't work in TC?  I thought it was something I was doing wrong.  I especially wanted the restart command so that when I make a change in the config I could test it easily with a restart command.

Thanks for your tips - very helpful.

Offline genec

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Re: syslinux upgrade for tc4.7.x?
« Reply #40 on: June 16, 2013, 08:15:42 AM »
The NSLU2 is rather limited in what it allows the end user to configure.  It insists on asking for a user name/password for any access.  Failed logongs are supposed to default to the "guest" account.
Unrecognized requests with the Authorization header, yes.  Without the header it's a failure with HTTP stastus 401.

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At the PXE boot menu, when I select an entry from the menu and press Enter, I need to see the response/error message before PXE returns to the menu (assuming a boot failure occures, which it does when trying an http boot).  As it is, I see just the briefest flash of a message and then it is gone and the menu is active again.
Working as intended.  You'd need a ONERROR command specified and COM32 module to pause the screen or try without the menu.


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I am currently trying that.  So far I just replaced lpxelinux.0 with undionly.kpxe (in udhcpd.conf) per the ipxe setup instructions.  I get the ipxe boot screen and can Ctrl-b to break out of the endless loop (again, per the instructions).  I have not gotten any further yet, still reading.  I was hoping that it would run the 'default' menu by default but it looks like I have to do some more configuration to get to that point.
Just like gpxelinux.0/ipxelinux.0: add a script and possibly pxelinux.0.  At that point, try the URL with username/password in the PXELINUX config.

Offline gmc

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Re: syslinux upgrade for tc4.7.x?
« Reply #41 on: June 18, 2013, 09:42:43 PM »
@genec - Very useful information.  I managed to get an http boot to work with ipxelinux.0, thanks.  I'm still hoping to get it working with syslinux but now I have another option to fall back on for the present.  All the tips were what I needed, thanks.

I'm presently trying to get a second NSLU2 I picked up upgraded to openwrt firmware.  That should allow me to have the control needed to work with syslinux http booting.  The reflashing went OK, but I could not get an IP address to the unit.  I off to work on that now...