net: Get pxe config file from dhcp option 209
Allow dhcp server pass pxe config file full path by using option 209
Signed-off-by: Sean Edmond <seanedmond@microsoft.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index fd16c3a..df6d71c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1840,6 +1840,10 @@
default 0x15 if ARM
default 0x0 if X86
+config BOOTP_PXE_DHCP_OPTION
+ bool "Request & store 'pxe_configfile' from BOOTP/DHCP server"
+ depends on BOOTP_PXE
+
config BOOTP_VCI_STRING
string
depends on CMD_BOOTP
diff --git a/cmd/pxe.c b/cmd/pxe.c
index 7045897..21134eb 100644
--- a/cmd/pxe.c
+++ b/cmd/pxe.c
@@ -141,6 +141,14 @@
env_get("bootfile"), use_ipv6))
return -ENOMEM;
+ if (IS_ENABLED(CONFIG_BOOTP_PXE_DHCP_OPTION) &&
+ pxelinux_configfile && !use_ipv6) {
+ if (pxe_dhcp_option_path(&ctx, pxefile_addr_r) > 0)
+ goto done;
+
+ goto error_exit;
+ }
+
if (IS_ENABLED(CONFIG_DHCP6_PXE_DHCP_OPTION) &&
pxelinux_configfile && use_ipv6) {
if (pxe_dhcp_option_path(&ctx, pxefile_addr_r) > 0)
diff --git a/net/bootp.c b/net/bootp.c
index 7b0f45e..6800290 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -26,6 +26,7 @@
#ifdef CONFIG_BOOTP_RANDOM_DELAY
#include "net_rand.h"
#endif
+#include <malloc.h>
#define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
@@ -601,6 +602,10 @@
*e++ = 42;
*cnt += 1;
#endif
+ if (IS_ENABLED(CONFIG_BOOTP_PXE_DHCP_OPTION)) {
+ *e++ = 209; /* PXELINUX Config File */
+ *cnt += 1;
+ }
/* no options, so back up to avoid sending an empty request list */
if (*cnt == 0)
e -= 2;
@@ -909,6 +914,22 @@
net_boot_file_name[size] = 0;
}
break;
+ case 209: /* PXELINUX Config File */
+ if (IS_ENABLED(CONFIG_BOOTP_PXE_DHCP_OPTION)) {
+ /* In case it has already been allocated when get DHCP Offer packet,
+ * free first to avoid memory leak.
+ */
+ if (pxelinux_configfile)
+ free(pxelinux_configfile);
+
+ pxelinux_configfile = (char *)malloc((oplen + 1) * sizeof(char));
+
+ if (pxelinux_configfile)
+ strlcpy(pxelinux_configfile, popt + 2, oplen + 1);
+ else
+ printf("Error: Failed to allocate pxelinux_configfile\n");
+ }
+ break;
default:
#if defined(CONFIG_BOOTP_VENDOREX)
if (dhcp_vendorex_proc(popt))