From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Michael Chang <mchang@suse.com>

Date: Thu, 14 Jul 2016 18:45:14 +0800

Subject: [PATCH] bootp: Add processing DHCPACK packet from HTTP Boot

The vendor class identifier with the string "HTTPClient" is used to denote the

packet as responding to HTTP boot request. In DHCP4 config, the filename for

HTTP boot is the URL of the boot file while for PXE boot it is the path to the

boot file. As a consequence, the next-server becomes obseleted because the HTTP

URL already contains the server address for the boot file. For DHCP6 config,

there's no difference definition in existing config as dhcp6.bootfile-url can

be used to specify URL for both HTTP and PXE boot file.

This patch adds processing for "HTTPClient" vendor class identifier in DHCPACK

packet by treating it as HTTP format, not as the PXE format.

Signed-off-by: Michael Chang <mchang@suse.com>

Signed-off-by: Ken Lin <ken.lin@hpe.com>

---

 grub-core/net/bootp.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++--

 include/grub/net.h    |  1 +

 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c

index dd4660601e2..d47ad80a2ad 100644

--- a/grub-core/net/bootp.c

+++ b/grub-core/net/bootp.c

@@ -20,6 +20,7 @@

 #include <grub/env.h>

 #include <grub/i18n.h>

 #include <grub/command.h>

+#include <grub/net.h>

 #include <grub/net/ip.h>

 #include <grub/net/netbuff.h>

 #include <grub/net/udp.h>

@@ -254,6 +255,11 @@ parse_dhcp_vendor (const char *name, const void *vend, int limit, int *mask)

                                      taglength);

           break;

+        case GRUB_NET_BOOTP_VENDOR_CLASS_IDENTIFIER:

+          grub_env_set_net_property (name, "vendor_class_identifier", (const char *) ptr,

+                                     taglength);

+	  break;

+

 	case GRUB_NET_BOOTP_EXTENSIONS_PATH:

           grub_env_set_net_property (name, "extensionspath", (const char *) ptr,

                                      taglength);

@@ -356,6 +362,66 @@ grub_net_configure_by_dhcp_ack (const char *name,

     }

 #endif

+  if (size > OFFSET_OF (vendor, bp))

+    {

+      char *cidvar;

+      const char *cid;

+

+      parse_dhcp_vendor (name, &bp->vendor, size - OFFSET_OF (vendor, bp), &mask);

+      cidvar = grub_xasprintf ("net_%s_%s", name, "vendor_class_identifier");

+      cid = grub_env_get (cidvar);

+      grub_free (cidvar);

+

+      if (cid && grub_strcmp (cid, "HTTPClient") == 0)

+	{

+	  char *proto, *ip, *pa;

+

+	  if (!dissect_url (bp->boot_file, &proto, &ip, &pa))

+	    return inter;

+

+	  grub_env_set_net_property (name, "boot_file", pa, grub_strlen (pa));

+	  if (is_def)

+	    {

+	      grub_net_default_server = grub_strdup (ip);

+	      grub_env_set ("net_default_interface", name);

+	      grub_env_export ("net_default_interface");

+	    }

+	  if (device && !*device)

+	    {

+	      *device = grub_xasprintf ("%s,%s", proto, ip);

+	      grub_print_error ();

+	    }

+	  if (path)

+	    {

+	      *path = grub_strdup (pa);

+	      grub_print_error ();

+	      if (*path)

+		{

+		  char *slash;

+		  slash = grub_strrchr (*path, '/');

+		  if (slash)

+		    *slash = 0;

+		  else

+		    **path = 0;

+		}

+	    }

+	  grub_net_add_ipv4_local (inter, mask);

+	  inter->dhcp_ack = grub_malloc (size);

+	  if (inter->dhcp_ack)

+	    {

+	      grub_memcpy (inter->dhcp_ack, bp, size);

+	      inter->dhcp_acklen = size;

+	    }

+	  else

+	    grub_errno = GRUB_ERR_NONE;

+

+	  grub_free (proto);

+	  grub_free (ip);

+	  grub_free (pa);

+	  return inter;

+	}

+    }

+

   if (size > OFFSET_OF (boot_file, bp))

     grub_env_set_net_property (name, "boot_file", bp->boot_file,

                                sizeof (bp->boot_file));

@@ -417,8 +483,6 @@ grub_net_configure_by_dhcp_ack (const char *name,

 	    **path = 0;

 	}

     }

-  if (size > OFFSET_OF (vendor, bp))

-    parse_dhcp_vendor (name, &bp->vendor, size - OFFSET_OF (vendor, bp), &mask);

   grub_net_add_ipv4_local (inter, mask);

   inter->dhcp_ack = grub_malloc (size);

diff --git a/include/grub/net.h b/include/grub/net.h

index 8ecfbb49221..1ec827b9bf3 100644

--- a/include/grub/net.h

+++ b/include/grub/net.h

@@ -498,6 +498,7 @@ enum

     GRUB_NET_BOOTP_DOMAIN = 0x0f,

     GRUB_NET_BOOTP_ROOT_PATH = 0x11,

     GRUB_NET_BOOTP_EXTENSIONS_PATH = 0x12,

+    GRUB_NET_BOOTP_VENDOR_CLASS_IDENTIFIER = 0x3c,

     GRUB_NET_BOOTP_CLIENT_ID = 0x3d,

     GRUB_NET_BOOTP_CLIENT_UUID = 0x61,

     GRUB_NET_BOOTP_END = 0xff