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

[mirror_edk2.git] / NetworkPkg / UefiPxeBcDxe / PxeBcDhcp4.c

diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
index 23682b2451857bb4dc93cda3f268316858b5eb85..40e1fe02109e2964e1e656fc6f8ceaa4478721f5 100644 (file)
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp4.c
@@ -1,7 +1,7 @@
 /** @file\r
   Functions implementation related with DHCPv4 for UefiPxeBc Driver.\r
 \r
 /** @file\r
   Functions implementation related with DHCPv4 for UefiPxeBc Driver.\r
 \r

-  Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>\r

 \r
   This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
 \r
   This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r


@@ -472,6 +472,7 @@ PxeBcParseDhcp4Packet (
 \r
   //\r
   // Parse DHCPv4 options in this offer, and store the pointers.\r
 \r
   //\r
   // Parse DHCPv4 options in this offer, and store the pointers.\r

+  // First, try to parse DHCPv4 options from the DHCP optional parameters field.\r

   //\r
   for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {\r
     Options[Index] = PxeBcParseDhcp4Options (\r
   //\r
   for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {\r
     Options[Index] = PxeBcParseDhcp4Options (\r


@@ -480,6 +481,35 @@ PxeBcParseDhcp4Packet (
                        mInterestedDhcp4Tags[Index]\r
                        );\r
   }\r
                        mInterestedDhcp4Tags[Index]\r
                        );\r
   }\r

+  //\r
+  // Second, Check if bootfilename and serverhostname is overloaded to carry DHCP options refers to rfc-2132. \r
+  // If yes, try to parse options from the BootFileName field, then ServerName field.\r
+  //\r
+  Option = Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD];\r
+  if (Option != NULL) {\r
+    if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) != 0) {\r
+      for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {\r
+        if (Options[Index] == NULL) {\r
+          Options[Index] = PxeBcParseDhcp4Options (\r
+                             (UINT8 *) Offer->Dhcp4.Header.BootFileName,\r
+                             sizeof (Offer->Dhcp4.Header.BootFileName),\r
+                             mInterestedDhcp4Tags[Index]\r
+                             );\r
+        }\r
+      }\r
+    }\r
+    if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_SERVER_NAME) != 0) {\r
+      for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {\r
+        if (Options[Index] == NULL) {\r
+          Options[Index] = PxeBcParseDhcp4Options (\r
+                             (UINT8 *) Offer->Dhcp4.Header.ServerName,\r
+                             sizeof (Offer->Dhcp4.Header.ServerName),\r
+                             mInterestedDhcp4Tags[Index]\r
+                             );\r
+        }\r
+      }\r
+    }\r
+  }\r

 \r
   //\r
   // The offer with "yiaddr" is a proxy offer.\r
 \r
   //\r
   // The offer with "yiaddr" is a proxy offer.\r


@@ -506,30 +536,21 @@ PxeBcParseDhcp4Packet (
   }\r
 \r
   //\r
   }\r
 \r
   //\r

-  // Check whether bootfilename and serverhostname overloaded, refers to rfc-2132 in details.\r
-  // If overloaded, parse the buffer as nested DHCPv4 options, or else just parse as bootfilename\r
-  // and serverhostname option.\r
+  // Parse PXE boot file name:\r
+  // According to PXE spec, boot file name should be read from DHCP option 67 (bootfile name) if present.\r
+  // Otherwise, read from boot file field in DHCP header.\r

   //\r
   //\r

-  Option = Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD];\r
-  if (Option != NULL && (Option->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) != 0) {\r
-\r
-    Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] = PxeBcParseDhcp4Options (\r
-                                                (UINT8 *) Offer->Dhcp4.Header.BootFileName,\r
-                                                sizeof (Offer->Dhcp4.Header.BootFileName),\r
-                                                PXEBC_DHCP4_TAG_BOOTFILE\r
-                                                );\r
+  if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {\r

     //\r
     // RFC 2132, Section 9.5 does not strictly state Bootfile name (option 67) is null\r
     // terminated string. So force to append null terminated character at the end of string.\r
     //\r
     //\r
     // RFC 2132, Section 9.5 does not strictly state Bootfile name (option 67) is null\r
     // terminated string. So force to append null terminated character at the end of string.\r
     //\r

-    if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {\r
-      Ptr8 =  (UINT8*)&Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];\r
-      Ptr8 += Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Length;\r
-      *Ptr8 =  '\0';\r
+    Ptr8 =  (UINT8*)&Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];\r
+    Ptr8 += Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Length;\r
+    if (*(Ptr8 - 1) != '\0') {\r
+      *Ptr8 = '\0';\r

     }\r
     }\r

-\r
-  } else if ((Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] == NULL) &&\r
-            (Offer->Dhcp4.Header.BootFileName[0] != 0)) {\r
+  } else if (Offer->Dhcp4.Header.BootFileName[0] != 0) {\r

     //\r
     // If the bootfile is not present and bootfilename is present in DHCPv4 packet, just parse it.\r
     // Do not count dhcp option header here, or else will destroy the serverhostname.\r
     //\r
     // If the bootfile is not present and bootfilename is present in DHCPv4 packet, just parse it.\r
     // Do not count dhcp option header here, or else will destroy the serverhostname.\r