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1. Update the parsing logic of DHCP message in PXE driver.

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2. Append null terminated character at the end of option 67.
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Dong, Guo <guo.dong@intel.com>
Reviewed-by: Jin, Eric <eric.jin@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15099 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Fu Siyuan
2014-01-13 02:53:50 +00:00
committed by sfu5
parent 20182c7ea1
commit 8cb92971e4
2 changed files with 86 additions and 43 deletions
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59
NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
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@@ -1,7 +1,7 @@
/** @file
Functions implementation related with DHCPv4 for UefiPxeBc Driver.
Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -472,6 +472,7 @@ PxeBcParseDhcp4Packet (
//
// Parse DHCPv4 options in this offer, and store the pointers.
// First, try to parse DHCPv4 options from the DHCP optional parameters field.
//
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
Options[Index] = PxeBcParseDhcp4Options (
@@ -480,6 +481,35 @@ PxeBcParseDhcp4Packet (
mInterestedDhcp4Tags[Index]
);
}
//
// Second, Check if bootfilename and serverhostname is overloaded to carry DHCP options refers to rfc-2132.
// If yes, try to parse options from the BootFileName field, then ServerName field.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD];
if (Option != NULL) {
if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) != 0) {
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
if (Options[Index] == NULL) {
Options[Index] = PxeBcParseDhcp4Options (
(UINT8 *) Offer->Dhcp4.Header.BootFileName,
sizeof (Offer->Dhcp4.Header.BootFileName),
mInterestedDhcp4Tags[Index]
);
}
}
}
if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_SERVER_NAME) != 0) {
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
if (Options[Index] == NULL) {
Options[Index] = PxeBcParseDhcp4Options (
(UINT8 *) Offer->Dhcp4.Header.ServerName,
sizeof (Offer->Dhcp4.Header.ServerName),
mInterestedDhcp4Tags[Index]
);
}
}
}
}
//
// The offer with "yiaddr" is a proxy offer.
@@ -506,30 +536,21 @@ PxeBcParseDhcp4Packet (
}
//
// Check whether bootfilename and serverhostname overloaded, refers to rfc-2132 in details.
// If overloaded, parse the buffer as nested DHCPv4 options, or else just parse as bootfilename
// and serverhostname option.
// Parse PXE boot file name:
// According to PXE spec, boot file name should be read from DHCP option 67 (bootfile name) if present.
// Otherwise, read from boot file field in DHCP header.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD];
if (Option != NULL && (Option->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) != 0) {
Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] = PxeBcParseDhcp4Options (
(UINT8 *) Offer->Dhcp4.Header.BootFileName,
sizeof (Offer->Dhcp4.Header.BootFileName),
PXEBC_DHCP4_TAG_BOOTFILE
);
if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {
//
// RFC 2132, Section 9.5 does not strictly state Bootfile name (option 67) is null
// terminated string. So force to append null terminated character at the end of string.
//
if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {
Ptr8 = (UINT8*)&Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];
Ptr8 += Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Length;
*Ptr8 = '\0';
Ptr8 = (UINT8*)&Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];
Ptr8 += Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Length;
if (*(Ptr8 - 1) != '\0') {
*Ptr8 = '\0';
}
} else if ((Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] == NULL) &&
(Offer->Dhcp4.Header.BootFileName[0] != 0)) {
} else if (Offer->Dhcp4.Header.BootFileName[0] != 0) {
//
// If the bootfile is not present and bootfilename is present in DHCPv4 packet, just parse it.
// Do not count dhcp option header here, or else will destroy the serverhostname.