[U-Boot] [PATCH v7 3/4] Integrating TCP and wget into u-boot

[DH at synoia.com <DH@synoia.com>]

From: Duncan Hare <DuncanCHare@yahoo.com>

All the code is new, and not copied from any source.

>>>>>
<<<<

Commit-notes
Integrating TCP and wget into u-boot

All the code is new, and not copied from any source.

>>>>>
<<<<

Commit-notes

Why http and wget:

HTTP is the most efficient file retrieval protocol in common
use. The client send a single request, after TCP connection,
to receive a file of any length.

WGET is the application which implements http file transfer
outside browsers as a file transfer protocol. Versions of
wget exists on many operating systems.
Integrating TCP and wget into u-boot

All the code is new, and not copied from any source.

>>>>>
Integrating TCP and wget into u-boot

<<<<

Commit-notes

Why http and wget:

HTTP is the most efficient file retrieval protocol in common
use. The client send a single request, after TCP connection,
to receive a file of any length.

WGET is the application which implements http file transfer
outside browsers as a file transfer protocol. Versions of
wget exists on many operating systems.

END

Signed-off-by: Duncan Hare <DuncanCHare@yahoo.com>
---

Changes in v7:
Integrating TCP and wget into u-boot
Integrating TCP and wget into u-boot

 cmd/Kconfig        |  93 ++----------
 cmd/net.c          |  13 ++
 include/net/wget.h |  17 +++
 net/Makefile       |   1 +
 net/wget.c         | 419 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 466 insertions(+), 77 deletions(-)
 create mode 100644 include/net/wget.h
 create mode 100644 net/wget.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 136836d146..46b489a966 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -23,29 +23,6 @@ config HUSH_PARSER
 	  If disabled, you get the old, much simpler behaviour with a somewhat
 	  smaller memory footprint.
 
-config CMDLINE_EDITING
-	bool "Enable command line editing"
-	depends on CMDLINE
-	default y
-	help
-	  Enable editing and History functions for interactive command line
-	  input operations
-
-config AUTO_COMPLETE
-	bool "Enable auto complete using TAB"
-	depends on CMDLINE
-	default y
-	help
-	  Enable auto completion of commands using TAB.
-
-config SYS_LONGHELP
-	bool "Enable long help messages"
-	depends on CMDLINE
-	default y if CMDLINE
-	help
-	  Defined when you want long help messages included
-	  Do not set this option when short of memory.
-
 config SYS_PROMPT
 	string "Shell prompt"
 	default "=> "
@@ -331,12 +308,6 @@ config CMD_SPL_WRITE_SIZE
 	  flash used by Falcon-mode boot. See the documentation until CMD_SPL
 	  for detail.
 
-config CMD_FITUPD
-	bool "fitImage update command"
-	help
-	  Implements the 'fitupd' command, which allows to automatically
-	  store software updates present on a TFTP server in NOR Flash
-
 config CMD_THOR_DOWNLOAD
 	bool "thor - TIZEN 'thor' download"
 	help
@@ -426,7 +397,6 @@ menu "Memory commands"
 config CMD_CRC32
 	bool "crc32"
 	select HASH
-	default n if ARCH_SUNXI
 	default y
 	help
 	  Compute CRC32.
@@ -568,7 +538,6 @@ config CMD_LZMADEC
 
 config CMD_UNZIP
 	bool "unzip"
-	default n if ARCH_SUNXI
 	default y if CMD_BOOTI
 	help
 	  Uncompress a zip-compressed memory region.
@@ -611,7 +580,7 @@ config CMD_DEMO
 
 config CMD_DFU
 	bool "dfu"
-	select DFU
+	select USB_FUNCTION_DFU
 	help
 	  Enables the command "dfu" which is used to have U-Boot create a DFU
 	  class device via USB. This command requires that the "dfu_alt_info"
@@ -645,7 +614,6 @@ config CMD_FLASH
 
 config CMD_FPGA
 	bool "fpga"
-	depends on FPGA
 	default y
 	help
 	  FPGA support.
@@ -701,7 +669,6 @@ config CMD_GPT
 	bool "GPT (GUID Partition Table) command"
 	select PARTITION_UUIDS
 	select EFI_PARTITION
-	select HAVE_BLOCK_DEVICE
 	imply RANDOM_UUID
 	help
 	  Enable the 'gpt' command to ready and write GPT style partition
@@ -709,7 +676,6 @@ config CMD_GPT
 
 config RANDOM_UUID
 	bool "GPT Random UUID generation"
-	select LIB_UUID
 	help
 	  Enable the generation of partitions with random UUIDs if none
 	  are provided.
@@ -780,14 +746,12 @@ config CMD_I2C
 
 config CMD_LOADB
 	bool "loadb"
-	default n if ARCH_SUNXI
 	default y
 	help
 	  Load a binary file over serial line.
 
 config CMD_LOADS
 	bool "loads"
-	default n if ARCH_SUNXI
 	default y
 	help
 	  Load an S-Record file over serial line
@@ -849,7 +813,6 @@ config CMD_ONENAND
 config CMD_PART
 	bool "part"
 	select PARTITION_UUIDS
-	select HAVE_BLOCK_DEVICE
 	help
 	  Read and display information about the partition table on
 	  various media.
@@ -900,15 +863,6 @@ config CMD_SAVES
 	  Provides a way to save a binary file using the Motorola S-Record
 	  format over the serial line.
 
-config CMD_SCSI
-	bool "scsi - Access to SCSI devices"
-	default y if SCSI
-	help
-	  This provides a 'scsi' command which provides access to SCSI (Small
-	  Computer System Interface) devices. The command provides a way to
-	  scan the bus, reset the bus, read and write data and get information
-	  about devices.
-
 config CMD_SDRAM
 	bool "sdram - Print SDRAM configuration information"
 	help
@@ -951,7 +905,6 @@ config CMD_UNIVERSE
 
 config CMD_USB
 	bool "usb"
-	select HAVE_BLOCK_DEVICE
 	help
 	  USB support.
 
@@ -961,18 +914,9 @@ config CMD_USB_SDP
 	help
 	  Enables the command "sdp" which is used to have U-Boot emulating the
 	  Serial Download Protocol (SDP) via USB.
-config CMD_ROCKUSB
-	bool "rockusb"
-	depends on USB_FUNCTION_ROCKUSB
-	help
-          Rockusb protocol is widely used by Rockchip SoC based devices. It can
-	  read/write info, image to/from devices. This enable rockusb command
-	  support to communication with rockusb device. for more detail about
-	  this command, please read doc/README.rockusb.
 
 config CMD_USB_MASS_STORAGE
 	bool "UMS usb mass storage"
-	select USB_FUNCTION_MASS_STORAGE
 	help
 	  USB mass storage support
 
@@ -1012,10 +956,9 @@ endmenu
 
 menu "Network commands"
 
-if NET
-
 config CMD_NET
 	bool "bootp, tftpboot"
+        select NET
 	default y
 	help
 	  Network commands.
@@ -1039,13 +982,11 @@ config CMD_RARP
 
 config CMD_DHCP
 	bool "dhcp"
-	depends on CMD_NET
 	help
 	  Boot image via network using DHCP/TFTP protocol
 
 config CMD_PXE
 	bool "pxe"
-	depends on CMD_NET
 	select MENU
 	help
 	  Boot image via network using PXE protocol
@@ -1094,7 +1035,11 @@ config CMD_ETHSW
 	  operations such as enabling / disabling a port and
 	  viewing/maintaining the filtering database (FDB)
 
-endif
+config CMD_WGET
+	bool "wget"
+	select TCP
+	help
+	  Download a kernel, or other files, from a web server over TCP.
 
 endmenu
 
@@ -1187,7 +1132,6 @@ config CMD_GETTIME
 # TODO: rename to CMD_SLEEP
 config CMD_MISC
 	bool "sleep"
-	default n if ARCH_SUNXI
 	default y
 	help
 	  Delay execution for some time
@@ -1227,7 +1171,6 @@ config CMD_TERMINAL
 
 config CMD_UUID
 	bool "uuid, guid - generation of unique IDs"
-	select LIB_UUID
 	help
 	  This enables two commands:
 
@@ -1239,8 +1182,6 @@ config CMD_UUID
 
 endmenu
 
-source "cmd/ti/Kconfig"
-
 config CMD_BOOTSTAGE
 	bool "Enable the 'bootstage' command"
 	depends on BOOTSTAGE
@@ -1422,20 +1363,17 @@ config CMD_CRAMFS
 
 config CMD_EXT2
 	bool "ext2 command support"
-	select FS_EXT4
 	help
 	  Enables EXT2 FS command
 
 config CMD_EXT4
 	bool "ext4 command support"
-	select FS_EXT4
 	help
 	  Enables EXT4 FS command
 
 config CMD_EXT4_WRITE
 	depends on CMD_EXT4
 	bool "ext4 write command support"
-	select EXT4_WRITE
 	help
 	  Enables EXT4 FS write command
 
@@ -1503,6 +1441,15 @@ config CMD_REISER
 	    reiserls - list files
 	    reiserload - load a file
 
+config CMD_SCSI
+	bool "scsi - Access to SCSI devices"
+	default y if SCSI
+	help
+	  This provides a 'scsi' command which provides access to SCSI (Small
+	  Computer System Interface) devices. The command provides a way to
+	  scan the bus, reset the bus, read and write data and get information
+	  about devices.
+
 config CMD_YAFFS2
 	bool "yaffs2 - Access of YAFFS2 filesystem"
 	depends on YAFFS2
@@ -1561,14 +1508,6 @@ config CMD_KGDB
 	  single-stepping, inspecting variables, etc. This is supported only
 	  on PowerPC at present.
 
-config CMD_LOG
-	bool "log - Generation, control and access to logging"
-	help
-	  This provides access to logging features. It allows the output of
-	  log data to be controlled to a limited extent (setting up the default
-	  maximum log level for emitting of records). It also provides access
-	  to a command used for testing the log system.
-
 config CMD_TRACE
 	bool "trace - Support tracing of function calls and timing"
 	help
diff --git a/cmd/net.c b/cmd/net.c
index d7c776aacf..6a7a51f357 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -110,6 +110,19 @@ U_BOOT_CMD(
 );
 #endif
 
+#if defined(CONFIG_CMD_WGET)
+static int do_wget(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	return netboot_common(WGET, cmdtp, argc, argv);
+}
+
+U_BOOT_CMD(
+	wget,	3,	1,	do_wget,
+	"boot image via network using HTTP protocol",
+	"[loadAddress] [[hostIPaddr:]path and image name]"
+);
+#endif
+
 static void netboot_update_env(void)
 {
 	char tmp[22];
diff --git a/include/net/wget.h b/include/net/wget.h
new file mode 100644
index 0000000000..dce16c573d
--- /dev/null
+++ b/include/net/wget.h
@@ -0,0 +1,17 @@
+/*
+ * Duncan Hare Copyright 2017
+ */
+
+void wget_start(void);			/* Begin wget */
+
+enum WGET_STATE {
+	WGET_CLOSED,
+	WGET_CONNECTING,
+	WGET_CONNECTED,
+	WGET_TRANSFERRING,
+	WGET_TRANSFERRED};
+
+#define	DEBUG_WGET		0	/* Set to 1 for debug messges */
+#define	SERVER_PORT		80
+#define	WGET_RETRY_COUNT	30
+#define	WGET_TIMEOUT		2000UL
diff --git a/net/Makefile b/net/Makefile
index 25729ebeeb..f83df5b728 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_CMD_RARP) += rarp.o
 obj-$(CONFIG_CMD_SNTP) += sntp.o
 obj-$(CONFIG_CMD_NET)  += tftp.o
 obj-$(CONFIG_TCP)      += tcp.o
+obj-$(CONFIG_CMD_WGET) += wget.o
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)
 # and this is intentional usage.
diff --git a/net/wget.c b/net/wget.c
new file mode 100644
index 0000000000..f7923e35c8
--- /dev/null
+++ b/net/wget.c
@@ -0,0 +1,419 @@
+/*
+ * WGET/HTTP support driver based on U-BOOT's nfs.c
+ * Copyright Duncan Hare <dh@synoia.com> 2017
+ * SPDX-License-Identifier:GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <mapmem.h>
+#include <net.h>
+#include <net/wget.h>
+#include <net/tcp.h>
+
+const char bootfile1[]   = "GET ";
+const  char bootfile3[]   = " HTTP/1.0\r\n\r\n";
+const char http_eom[]     = "\r\n\r\n";
+const char http_ok[]      = "200";
+const char content_len[]  = "Content-Length";
+const char linefeed[]     = "\r\n";
+static struct in_addr web_server_ip;
+static int our_port;
+static int wget_timeout_count;
+
+struct pkt_qd {
+	uchar *pkt;
+	unsigned int tcp_seq_num;
+	unsigned int len;
+};
+
+/*
+ * This is a control structure for out of order packets received.
+ * The actual packet bufers are in the kernel space, and are
+ * expected to be overwritten by the downloaded image.
+ */
+
+static struct pkt_qd pkt_q[PKTBUFSRX / 4];
+static int pkt_q_idx;
+static unsigned long content_length;
+static unsigned int packets;
+
+static unsigned int initial_data_seq_num;
+
+static enum  WGET_STATE wget_state;
+
+static char *image_url;
+static unsigned int wget_timeout = WGET_TIMEOUT;
+
+static void  wget_timeout_handler(void);
+
+static enum net_loop_state wget_loop_state;
+
+/* Timeout retry parameters */
+static u8 r_action;
+static unsigned int r_tcp_ack_num;
+static unsigned int r_tcp_seq_num;
+static int r_len;
+
+static inline int store_block(uchar *src, unsigned int offset, unsigned int len)
+{
+	ulong newsize = offset + len;
+	uchar *ptr;
+
+#ifdef CONFIG_SYS_DIRECT_FLASH_WGET
+	int i, rc = 0;
+
+	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
+		/* start address in flash? */
+		if (load_addr + offset >= flash_info[i].start[0]) {
+			rc = 1;
+			break;
+		}
+	}
+
+	if (rc) { /* Flash is destination for this packet */
+		rc = flash_write((uchar *)src,
+				 (ulong)(load_addr + offset), len);
+		if (rc) {
+			flash_perror(rc);
+			return -1;
+		}
+	} else {
+#endif /* CONFIG_SYS_DIRECT_FLASH_WGET */
+
+		ptr = map_sysmem(load_addr + offset, len);
+		memcpy(ptr, src, len);
+		unmap_sysmem(ptr);
+
+#ifdef CONFIG_SYS_DIRECT_FLASH_WGET
+	}
+#endif
+	if (net_boot_file_size < (offset + len))
+		net_boot_file_size = newsize;
+	return 0;
+}
+
+/*
+ * wget response dispatcher
+ * WARNING, This, and only this, is the place in wget,c where
+ * SEQUENCE NUMBERS are swapped between incoming (RX)
+ * and outgoing (TX).
+ * Procedure wget_handler() is correct for RX traffic.
+ */
+static void wget_send_stored(void)
+{
+	u8 action                  = r_action;
+	unsigned int tcp_ack_num   = r_tcp_ack_num;
+	unsigned int tcp_seq_num   = r_tcp_seq_num;
+	int len                    = r_len;
+	uchar *ptr;
+	uchar *offset;
+
+	tcp_ack_num = tcp_ack_num + len;
+
+	switch (wget_state) {
+	case WGET_CLOSED:
+		debug_cond(DEBUG_WGET, "wget: send SYN\n");
+		wget_state = WGET_CONNECTING;
+		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
+				    tcp_seq_num, tcp_ack_num);
+		packets = 0;
+	break;
+	case WGET_CONNECTING:
+		pkt_q_idx = 0;
+		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
+				    tcp_seq_num, tcp_ack_num);
+
+		ptr = net_tx_packet + net_eth_hdr_size()
+			+ IP_TCP_HDR_SIZE + TCP_TSOPT_SIZE + 2;
+		offset = ptr;
+
+		memcpy(offset, &bootfile1, strlen(bootfile1));
+		offset = offset + strlen(bootfile1);
+
+		memcpy(offset, image_url, strlen(image_url));
+		offset = offset + strlen(image_url);
+
+		memcpy(offset, &bootfile3, strlen(bootfile3));
+		offset = offset + strlen(bootfile3);
+		net_send_tcp_packet((offset - ptr), SERVER_PORT, our_port,
+				    TCP_PUSH, tcp_seq_num, tcp_ack_num);
+		wget_state = WGET_CONNECTED;
+	break;
+	case WGET_CONNECTED:
+	case WGET_TRANSFERRING:
+	case WGET_TRANSFERRED:
+		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
+				    tcp_seq_num, tcp_ack_num);
+	break;
+	}
+}
+
+static void wget_send(u8 action, unsigned int tcp_ack_num,
+		      unsigned int tcp_seq_num, int len)
+{
+	r_action        = action;
+	r_tcp_ack_num   = tcp_ack_num;
+	r_tcp_seq_num   = tcp_seq_num;
+	r_len           = len;
+	wget_send_stored();
+}
+
+void wget_fail(char *error_message, unsigned int tcp_seq_num,
+	       unsigned int tcp_ack_num, u8 action)
+{
+	printf("%s", error_message);
+	printf("%s", "wget: Transfer Fail\n");
+	net_set_timeout_handler(0, NULL);
+	wget_send(action, tcp_seq_num, tcp_ack_num, 0);
+}
+
+void wget_success(u8 action, unsigned int tcp_seq_num,
+		  unsigned int tcp_ack_num, int len, int packets)
+{
+	printf("Packets received %d, Transfer Successful\n", packets);
+	wget_send(action, tcp_seq_num, tcp_ack_num, len);
+}
+
+/*
+ * Interfaces of U-BOOT
+ */
+static void wget_timeout_handler(void)
+{
+	if (++wget_timeout_count > WGET_RETRY_COUNT) {
+		puts("\nRetry count exceeded; starting again\n");
+		wget_send(TCP_RST, 0, 0, 0);
+		net_start_again();
+	} else {
+		puts("T ");
+		net_set_timeout_handler(wget_timeout +
+					WGET_TIMEOUT * wget_timeout_count,
+					wget_timeout_handler);
+		wget_send_stored();
+	}
+}
+
+static void wget_connected(uchar *pkt, unsigned int tcp_seq_num,
+			   struct in_addr action_and_state,
+			   unsigned int tcp_ack_num, unsigned int len)
+{
+	u8 action = action_and_state.s_addr;
+	uchar *pkt_in_q;
+	char *pos;
+	int  hlen;
+	int  i;
+
+	pkt[len] = '\0';
+	pos = strstr((char *)pkt, http_eom);
+
+	if (pos == 0) {
+		debug_cond(DEBUG_WGET,
+			   "wget: Connected, data before Header %p\n", pkt);
+		pkt_in_q = (void *)load_addr + 0x20000 + (pkt_q_idx * 0x800);
+		memcpy(pkt_in_q, pkt, len);
+		pkt_q[pkt_q_idx].pkt              = pkt_in_q;
+		pkt_q[pkt_q_idx].tcp_seq_num      = tcp_seq_num;
+		pkt_q[pkt_q_idx].len              = len;
+		pkt_q_idx++;
+	} else {
+		debug_cond(DEBUG_WGET, "wget: Connected HTTP Header %p\n", pkt);
+		hlen = pos - (char *)pkt + sizeof(http_eom) - 1;
+		pos  = strstr((char *)pkt, linefeed);
+		if (pos > 0)
+			i = pos - (char *)pkt;
+		else
+			i = hlen;
+		tcp_print_buffer(pkt, i, i, -1, 0);
+
+		wget_state = WGET_TRANSFERRING;
+
+		if (strstr((char *)pkt, http_ok) == 0) {
+			debug_cond(DEBUG_WGET,
+				   "wget: Connected Bad Xfer\n");
+			wget_loop_state = NETLOOP_FAIL;
+			wget_send(action, tcp_seq_num, tcp_ack_num, len);
+		} else {
+			debug_cond(DEBUG_WGET,
+				   "wget: Connctd pkt %p  hlen %x\n",
+				   pkt, hlen);
+			initial_data_seq_num = tcp_seq_num + hlen;
+
+			pos  = strstr((char *)pkt, content_len);
+			if (!pos) {
+				content_length = -1;
+			} else {
+				pos = pos + sizeof(content_len) + 2;
+				strict_strtoul(pos, 10, &content_length);
+				debug_cond(DEBUG_WGET,
+					   "wget: Connected Len %lu\n",
+					   content_length);
+			}
+
+			net_boot_file_size = 0;
+
+			if (len > hlen)
+				store_block(pkt + hlen, 0, len - hlen);
+			debug_cond(DEBUG_WGET,
+				   "wget: Connected Pkt %p hlen %x\n",
+				   pkt, hlen);
+
+			for (i = 0; i < pkt_q_idx; i++) {
+				store_block(pkt_q[i].pkt,
+					    pkt_q[i].tcp_seq_num -
+						initial_data_seq_num,
+					    pkt_q[i].len);
+			debug_cond(DEBUG_WGET,
+				   "wget: Connctd pkt Q %p len %x\n",
+				   pkt_q[i].pkt, pkt_q[i].len);
+			}
+		}
+	}
+	wget_send(action, tcp_seq_num, tcp_ack_num, len);
+}
+
+	/*
+	 * In the "application push" invocation, the TCP header with all
+	 * its information is pointed to by the packet pointer.
+	 *
+	 * in the typedef
+	 *      void rxhand_tcp(uchar *pkt, unsigned int dport,
+	 *                      struct in_addr sip, unsigned int sport,
+	 *                      unsigned int len);
+	 * *pkt is the pointer to the payload
+	 * dport is used for tcp_seg_num
+	 * action_and_state.s_addr is used for TCP state
+	 * sport is used for tcp_ack_num (which is unused by the app)
+	 * pkt_ length is the payload length.
+	 */
+static void wget_handler(uchar *pkt, unsigned int tcp_seq_num,
+			 struct in_addr action_and_state,
+			 unsigned int tcp_ack_num, unsigned int len)
+{
+	enum TCP_STATE wget_tcp_state = tcp_get_tcp_state();
+	u8 action = action_and_state.s_addr;
+
+	net_set_timeout_handler(wget_timeout, wget_timeout_handler);
+	packets++;
+
+	switch (wget_state) {
+	case WGET_CLOSED:
+		debug_cond(DEBUG_WGET, "wget: Handler: Error!, State wrong\n");
+	break;
+	case WGET_CONNECTING:
+		debug_cond(DEBUG_WGET,
+			   "wget: Connecting In len=%x, Seq=%x, Ack=%x\n",
+			   len, tcp_seq_num, tcp_ack_num);
+		if (len == 0) {
+			if (wget_tcp_state == TCP_ESTABLISHED) {
+				debug_cond(DEBUG_WGET,
+					   "wget: Cting, send, len=%x\n", len);
+			wget_send(action, tcp_seq_num, tcp_ack_num, len);
+			} else {
+				tcp_print_buffer(pkt, len, len, -1, 0);
+				wget_fail("wget: Handler Connected Fail\n",
+					  tcp_seq_num, tcp_ack_num, action);
+			}
+		}
+	break;
+	case WGET_CONNECTED:
+		debug_cond(DEBUG_WGET, "wget: Connected seq=%x, len=%x\n",
+			   tcp_seq_num, len);
+		if (len == 0) {
+			wget_fail("Image not found, no data returned\n",
+				  tcp_seq_num, tcp_ack_num, action);
+		} else {
+			wget_connected(pkt, tcp_seq_num, action_and_state,
+				       tcp_ack_num, len);
+		}
+	break;
+	case WGET_TRANSFERRING:
+		debug_cond(DEBUG_WGET,
+			   "wget: Transferring, seq=%x, ack=%x,len=%x\n",
+			   tcp_seq_num, tcp_ack_num, len);
+
+		if (store_block(pkt,
+				tcp_seq_num - initial_data_seq_num, len) != 0) {
+			wget_fail("wget: store error\n",
+				  tcp_seq_num, tcp_ack_num, action);
+		} else {
+			switch (wget_tcp_state) {
+			case TCP_FIN_WAIT_2:
+				wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num,
+					  len);
+			case TCP_SYN_SENT:
+			case TCP_CLOSING:
+			case TCP_FIN_WAIT_1:
+			case TCP_CLOSED:
+				net_set_state(NETLOOP_FAIL);
+			break;
+			case TCP_ESTABLISHED:
+				wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num,
+					  len);
+				wget_loop_state = NETLOOP_SUCCESS;
+			break;
+			case TCP_CLOSE_WAIT:     /* End of transfer */
+				wget_state = WGET_TRANSFERRED;
+				wget_send(action | TCP_ACK | TCP_FIN,
+					  tcp_seq_num, tcp_ack_num, len);
+			break;
+			}
+		}
+	break;
+	case WGET_TRANSFERRED:
+		printf("Packets received %d, Transfer Successful\n", packets);
+		net_set_state(wget_loop_state);
+	break;
+	}
+}
+
+void wget_start(void)
+{
+	debug_cond(DEBUG_WGET, "%s\n", __func__);
+
+	image_url = strchr(net_boot_file_name, ':');
+	if (!image_url) {
+		web_server_ip = string_to_ip(net_boot_file_name);
+		++image_url;
+	} else {
+		web_server_ip = net_server_ip;
+		image_url = net_boot_file_name;
+	}
+
+	debug_cond(DEBUG_WGET,
+		   "wget: Transfer HTTP Server %pI4; our IP %pI4\n",
+		   &web_server_ip, &net_ip);
+
+	/* Check if we need to send across this subnet */
+	if (net_gateway.s_addr && net_netmask.s_addr) {
+		struct in_addr our_net;
+		struct in_addr server_net;
+
+		our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
+		server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
+		if (our_net.s_addr != server_net.s_addr)
+			debug_cond(DEBUG_WGET, "wget: sending through gateway %pI4",
+				   &net_gateway);
+	}
+	debug_cond(DEBUG_WGET, "URL '%s\n", image_url);
+
+	if (net_boot_file_expected_size_in_blocks) {
+		debug_cond(DEBUG_WGET, "wget: Size is 0x%x Bytes = ",
+			   net_boot_file_expected_size_in_blocks << 9);
+		print_size(net_boot_file_expected_size_in_blocks << 9, "");
+	}
+	debug_cond(DEBUG_WGET,
+		   "\nwget:Load address: 0x%lx\nLoading: *\b", load_addr);
+
+	net_set_timeout_handler(wget_timeout, wget_timeout_handler);
+	tcp_set_tcp_handler(wget_handler);
+
+	wget_timeout_count = 0;
+	wget_state = WGET_CLOSED;
+
+	our_port = random_port();
+
+	/* zero out server ether in case the server ip has changed */
+	memset(net_server_ethaddr, 0, 6);
+
+	wget_send(TCP_SYN, 0, 0, 0);
+}
-- 
2.11.0