Hi, Nao
You can't get the server's IP address directly from the device path, as you see
the image device path only contains the MAC address. But you can use this MAC
address to find out the NIC handle and the EFI_PXE_BASE_CODE_PROTOCOL which you
used to download the NBP file:
1. Use BS.LocateHandle to find all the handles that support
PxeBaseCodeProtocol.
2. Use NetLibGetMacAddress() or NetLibGetMacString() to determine the
handle which is used for this NBP download.
Then you can access the EFI_PXE_BASE_CODE_PROTOCOL.Mode structure, which
contains most of the information you needed for following PXE operation
The ELILO 3.16 (Elilo-3.16-source\fs\netfs.c) is a good example.
netfs_install() finds out all PXE handles.
netfs_extract_ip() shows how to extract DHCP and boot server's IP
address.
Other interfaces in NetFsProtocol shows how to produce a common file
system API base on PxeBaseCodeProtocol.
Best, Regards
Siyuan
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, November 06, 2013 12:17 AM
To: [email protected]
Subject: [edk2] How can NBP get PXE server's IP address?
Hello,
I'm trying to develop an UEFI NBP. However I cannot figure out how to get PXE
server's IP address.
According to the following Zimmer-san's blog, it should be able to get it
through the device path protocol.
http://vzimmer.blogspot.jp/2013/10/configuring-ipv6-network-boot.html
---
The bootx64.efi or bootia32.efi program, also known as the Network Boot Program
(NBP), when executed on the local client (hopefully with UEFI Secure Boot logic
applied prior to passing control into the image) can use any of the UEFI
networking API's in the protocols defined in the UEFI Spec to download further
.efi images, data files, or the operating system kernel. The device path
protocol on the loaded image protocol of the NBP can be used by the NBP code's
implementation to find the network address of the boot server from which the
NBP was loaded, too.
---
Here is the code I wrote based on the HelloWorld, and the result I got on
VMware Player 6.0 is the attached image .
The IP address, 208.65.3.10, shown in the image is not my PXE server. I don't
know what IP address it is.
I searched UEFI NBP example on Internet, and also looked at syslinux, elilo and
iPXE source code, but I couldn't find any reference.
Please advise me how to get the PXE IP address
gBS->HandleProtocol(
ImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **) &ImageInfo
);
gBS->HandleProtocol(
ImageInfo->DeviceHandle,
&gEfiDevicePathProtocolGuid,
(VOID *) &DevicePath
);
Print (
L"Image device : %s\n",
DevicePathToStr (DevicePath)
);
isMulti = IsDevicePathMultiInstance(DevicePath);
isMultiStr = isMulti ? L"TRUE" : L"FALSE";
Print (L"isMulti : %s\n", isMultiStr);
Print (L"DevicePath->Type : %x\nDevicePath->SubType :
%x\nDevicePath->Length[0] : %x\nDevicePath->Length[1] : %x\n",
DevicePath->Type,DevicePath->SubType,DevicePath->Length[0],DevicePath->Length[1]);
DevicePath->Type = 3;
DevicePath->SubType = 12;
Remaining = DevicePath;
do {
Print (L"i=%d >>> ", i++);
Status = gBS->LocateDevicePath (&gEfiDevicePathProtocolGuid,
&Remaining, &MyHandle);
gBS->HandleProtocol(
MyHandle,
&gEfiDevicePathProtocolGuid,
(VOID *) &DevicePath
);
Print (
L"Image device : %s\n",
DevicePathToStr (DevicePath)
);
} while (!EFI_ERROR (Status) && !IsDevicePathEnd (Remaining));
Best regards,
-nao
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