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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Wed, 10 Jul 2019 23:58:28 +0200
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Subject: [PATCH] bootp: Add processing DHCPACK packet from HTTP Boot
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The vendor class identifier with the string "HTTPClient" is used to denote the
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packet as responding to HTTP boot request. In DHCP4 config, the filename for
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HTTP boot is the URL of the boot file while for PXE boot it is the path to the
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boot file. As a consequence, the next-server becomes obseleted because the HTTP
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URL already contains the server address for the boot file. For DHCP6 config,
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there's no difference definition in existing config as dhcp6.bootfile-url can
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be used to specify URL for both HTTP and PXE boot file.
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This patch adds processing for "HTTPClient" vendor class identifier in DHCPACK
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packet by treating it as HTTP format, not as the PXE format.
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Signed-off-by: Michael Chang <mchang@suse.com>
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Signed-off-by: Ken Lin <ken.lin@hpe.com>
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---
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grub-core/net/bootp.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
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include/grub/net.h | 1 +
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2 files changed, 56 insertions(+)
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diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
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index 68c4df681b5..0b430489329 100644
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--- a/grub-core/net/bootp.c
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+++ b/grub-core/net/bootp.c
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@@ -20,6 +20,7 @@
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#include <grub/env.h>
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#include <grub/i18n.h>
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#include <grub/command.h>
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+#include <grub/net.h>
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#include <grub/net/ip.h>
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#include <grub/net/netbuff.h>
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#include <grub/net/udp.h>
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@@ -500,6 +501,60 @@ grub_net_configure_by_dhcp_ack (const char *name,
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if (opt && opt_len)
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grub_env_set_net_property (name, "rootpath", (const char *) opt, opt_len);
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+ opt = find_dhcp_option (bp, size, GRUB_NET_BOOTP_VENDOR_CLASS_IDENTIFIER, &opt_len);
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+ if (opt && opt_len)
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+ {
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+ grub_env_set_net_property (name, "vendor_class_identifier", (const char *) opt, opt_len);
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+ if (opt && grub_strcmp (opt, "HTTPClient") == 0)
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+ {
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+ char *proto, *ip, *pa;
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+
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+ if (!dissect_url (bp->boot_file, &proto, &ip, &pa))
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+ return inter;
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+
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+ grub_env_set_net_property (name, "boot_file", pa, grub_strlen (pa));
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+ if (is_def)
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+ {
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+ grub_net_default_server = grub_strdup (ip);
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+ grub_env_set ("net_default_interface", name);
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+ grub_env_export ("net_default_interface");
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+ }
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+ if (device && !*device)
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+ {
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+ *device = grub_xasprintf ("%s,%s", proto, ip);
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+ grub_print_error ();
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+ }
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+ if (path)
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+ {
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+ *path = grub_strdup (pa);
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+ grub_print_error ();
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+ if (*path)
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+ {
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+ char *slash;
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+ slash = grub_strrchr (*path, '/');
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+ if (slash)
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+ *slash = 0;
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+ else
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+ **path = 0;
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+ }
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+ }
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+ grub_net_add_ipv4_local (inter, mask);
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+ inter->dhcp_ack = grub_malloc (size);
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+ if (inter->dhcp_ack)
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+ {
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+ grub_memcpy (inter->dhcp_ack, bp, size);
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+ inter->dhcp_acklen = size;
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+ }
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+ else
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+ grub_errno = GRUB_ERR_NONE;
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+
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+ grub_free (proto);
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+ grub_free (ip);
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+ grub_free (pa);
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+ return inter;
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+ }
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+ }
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+
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opt = find_dhcp_option (bp, size, GRUB_NET_BOOTP_EXTENSIONS_PATH, &opt_len);
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if (opt && opt_len)
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grub_env_set_net_property (name, "extensionspath", (const char *) opt, opt_len);
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diff --git a/include/grub/net.h b/include/grub/net.h
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index 543251f7273..42af7de250a 100644
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--- a/include/grub/net.h
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+++ b/include/grub/net.h
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@@ -531,6 +531,7 @@ enum
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GRUB_NET_DHCP_MESSAGE_TYPE = 53,
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GRUB_NET_DHCP_SERVER_IDENTIFIER = 54,
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GRUB_NET_DHCP_PARAMETER_REQUEST_LIST = 55,
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+ GRUB_NET_BOOTP_VENDOR_CLASS_IDENTIFIER = 60,
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GRUB_NET_BOOTP_CLIENT_ID = 61,
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GRUB_NET_DHCP_TFTP_SERVER_NAME = 66,
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GRUB_NET_DHCP_BOOTFILE_NAME = 67,
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