[PATCH v16 2/2] net: Add wget application
Ying-Chun Liu (PaulLiu)
paul.liu at linaro.org
Fri Jun 10 20:10:13 CEST 2022
From: "Ying-Chun Liu (PaulLiu)" <paul.liu at linaro.org>
This commit adds a simple wget command that can download files
from http server.
The command syntax is
wget ${loadaddr} <path of the file from server>
Signed-off-by: Duncan Hare <DuncanCHare at yahoo.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
Cc: Christian Gmeiner <christian.gmeiner at gmail.com>
Cc: Joe Hershberger <joe.hershberger at ni.com>
Cc: Michal Simek <michal.simek at xilinx.com>
Cc: Ramon Fried <rfried.dev at gmail.com>
---
v1-v12: Made by Duncan, didn't tracked.
v13: Fix some issues which is reviewed by Christian
v14: Add options to enable/disable SACK.
v15: Fix various syntax errors reviewed by Michal.
Remove magic numbers. Use kernel-doc format.
v16: Add more kernel-doc. Fix more double spaces.
---
cmd/Kconfig | 7 +
cmd/net.c | 13 ++
include/net.h | 2 +-
include/net/wget.h | 22 +++
net/Makefile | 1 +
net/net.c | 6 +
net/wget.c | 426 +++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 476 insertions(+), 1 deletion(-)
create mode 100644 include/net/wget.h
create mode 100644 net/wget.c
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 09193b61b9..5a5f2f1df8 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1715,6 +1715,13 @@ config NFS_TIMEOUT
"ERROR: Cannot umount" in nfs command, try longer timeout such as
10000.
+config CMD_WGET
+ bool "wget"
+ select TCP
+ help
+ wget is a simple command to download kernel, or other files,
+ from a http server over TCP.
+
config CMD_MII
bool "mii"
imply CMD_MDIO
diff --git a/cmd/net.c b/cmd/net.c
index 3619c843d8..60fd785061 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -124,6 +124,19 @@ U_BOOT_CMD(
);
#endif
+#if defined(CONFIG_CMD_WGET)
+static int do_wget(struct cmd_tbl *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.h b/include/net.h
index b7bac86cf1..fb80a8981d 100644
--- a/include/net.h
+++ b/include/net.h
@@ -559,7 +559,7 @@ extern int net_restart_wrap; /* Tried all network devices */
enum proto_t {
BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
- TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT, WOL, UDP
+ TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT, WOL, UDP, WGET
};
extern char net_boot_file_name[1024];/* Boot File name */
diff --git a/include/net/wget.h b/include/net/wget.h
new file mode 100644
index 0000000000..da0920de11
--- /dev/null
+++ b/include/net/wget.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Duncan Hare Copyright 2017
+ */
+
+/**
+ * wget_start() - begin wget
+ */
+void wget_start(void);
+
+enum wget_state {
+ WGET_CLOSED,
+ WGET_CONNECTING,
+ WGET_CONNECTED,
+ WGET_TRANSFERRING,
+ WGET_TRANSFERRED
+};
+
+#define DEBUG_WGET 0 /* Set to 1 for debug messages */
+#define SERVER_PORT 80
+#define WGET_RETRY_COUNT 30
+#define WGET_TIMEOUT 2000UL
diff --git a/net/Makefile b/net/Makefile
index d131d1cb1a..4f757a224c 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_UDP_FUNCTION_FASTBOOT) += fastboot.o
obj-$(CONFIG_CMD_WOL) += wol.o
obj-$(CONFIG_PROT_UDP) += udp.o
obj-$(CONFIG_PROT_TCP) += tcp.o
+obj-$(CONFIG_CMD_WGET) += wget.o
# Disable this warning as it is triggered by:
# sprintf(buf, index ? "foo%d" : "foo", index)
diff --git a/net/net.c b/net/net.c
index 751d0251be..cee2ff8100 100644
--- a/net/net.c
+++ b/net/net.c
@@ -117,6 +117,7 @@
#include "wol.h"
#endif
#include <net/tcp.h>
+#include <net/wget.h>
/** BOOTP EXTENTIONS **/
@@ -505,6 +506,11 @@ restart:
nfs_start();
break;
#endif
+#if defined(CONFIG_CMD_WGET)
+ case WGET:
+ wget_start();
+ break;
+#endif
#if defined(CONFIG_CMD_CDP)
case CDP:
cdp_start();
diff --git a/net/wget.c b/net/wget.c
new file mode 100644
index 0000000000..6a2e92f17b
--- /dev/null
+++ b/net/wget.c
@@ -0,0 +1,426 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * WGET/HTTP support driver based on U-BOOT's nfs.c
+ * Copyright Duncan Hare <dh at synoia.com> 2017
+ */
+
+#include <command.h>
+#include <common.h>
+#include <env.h>
+#include <image.h>
+#include <mapmem.h>
+#include <net.h>
+#include <net/tcp.h>
+#include <net/wget.h>
+
+static const char bootfile1[] = "GET ";
+static const char bootfile3[] = " HTTP/1.0\r\n\r\n";
+static const char http_eom[] = "\r\n\r\n";
+static const char http_ok[] = "200";
+static const char content_len[] = "Content-Length";
+static 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 current_wget_state;
+
+static char *image_url;
+static unsigned int wget_timeout = WGET_TIMEOUT;
+
+static enum net_loop_state wget_loop_state;
+
+/* Timeout retry parameters */
+static u8 retry_action; /* actions for TCP retry */
+static unsigned int retry_tcp_ack_num; /* TCP retry acknowledge number*/
+static unsigned int retry_tcp_seq_num; /* TCP retry sequence number */
+static int retry_len; /* TCP retry length */
+
+/**
+ * store_block() - store block in memory
+ * @src: source of data
+ * @offset: offset
+ * @len: length
+ */
+static inline int store_block(uchar *src, unsigned int offset, unsigned int len)
+{
+ ulong newsize = offset + len;
+ uchar *ptr;
+
+ ptr = map_sysmem(image_load_addr + offset, len);
+ memcpy(ptr, src, len);
+ unmap_sysmem(ptr);
+
+ if (net_boot_file_size < (offset + len))
+ net_boot_file_size = newsize;
+
+ return 0;
+}
+
+/**
+ * wget_send_stored() - 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 = retry_action;
+ int len = retry_len;
+ unsigned int tcp_ack_num = retry_tcp_ack_num + len;
+ unsigned int tcp_seq_num = retry_tcp_seq_num;
+ uchar *ptr, *offset;
+
+ switch (current_wget_state) {
+ case WGET_CLOSED:
+ debug_cond(DEBUG_WGET, "wget: send SYN\n");
+ current_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 += strlen(bootfile1);
+
+ memcpy(offset, image_url, strlen(image_url));
+ offset += strlen(image_url);
+
+ memcpy(offset, &bootfile3, strlen(bootfile3));
+ offset += strlen(bootfile3);
+ net_send_tcp_packet((offset - ptr), SERVER_PORT, our_port,
+ TCP_PUSH, tcp_seq_num, tcp_ack_num);
+ current_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)
+{
+ retry_action = action;
+ retry_tcp_ack_num = tcp_ack_num;
+ retry_tcp_seq_num = tcp_seq_num;
+ retry_len = len;
+
+ wget_send_stored();
+}
+
+void wget_fail(char *error_message, unsigned int tcp_seq_num,
+ unsigned int tcp_ack_num, u8 action)
+{
+ printf("wget: Transfer Fail - %s\n", error_message);
+ 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();
+ }
+}
+
+#define PKT_QUEUE_OFFSET 0x20000
+#define PKT_QUEUE_PACKET_SIZE 0x800
+
+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, i;
+
+ pkt[len] = '\0';
+ pos = strstr((char *)pkt, http_eom);
+
+ if (!pos) {
+ debug_cond(DEBUG_WGET,
+ "wget: Connected, data before Header %p\n", pkt);
+ pkt_in_q = (void *)image_load_addr + PKT_QUEUE_OFFSET +
+ (pkt_q_idx * PKT_QUEUE_PACKET_SIZE);
+ 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);
+ /* sizeof(http_eom) - 1 is the string length of (http_eom) */
+ hlen = pos - (char *)pkt + sizeof(http_eom) - 1;
+ pos = strstr((char *)pkt, linefeed);
+ if (pos > 0)
+ i = pos - (char *)pkt;
+ else
+ i = hlen;
+ printf("%.*s", i, pkt);
+
+ current_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 += 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);
+}
+
+/**
+ * wget_handler() - handler of wget
+ * @pkt: the pointer to the payload
+ * @tcp_seq_num: tcp sequence number
+ * @action_and_state: TCP state
+ * @tcp_ack_num: tcp acknowledge number
+ * @len: length of the payload
+ *
+ * In the "application push" invocation, the TCP header with all
+ * its information is pointed to by the packet pointer.
+ */
+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 (current_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) {
+ 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 {
+ printf("%.*s", len, pkt);
+ 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) {
+ 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);
+ return;
+ }
+
+ switch (wget_tcp_state) {
+ case TCP_FIN_WAIT_2:
+ wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num, len);
+ fallthrough;
+ 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 */
+ current_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;
+ }
+}
+
+#define RANDOM_PORT_START 1024
+#define RANDOM_PORT_RANGE 0x4000
+
+/**
+ * random_port() - make port a little random (1024-17407)
+ *
+ * Return: random port number from 1024 to 17407
+ *
+ * This keeps the math somewhat trivial to compute, and seems to work with
+ * all supported protocols/clients/servers
+ */
+static unsigned int random_port(void)
+{
+ return RANDOM_PORT_START + (get_timer(0) % RANDOM_PORT_RANGE);
+}
+
+#define BLOCKSIZE 512
+
+void wget_start(void)
+{
+ image_url = strchr(net_boot_file_name, ':');
+ if (image_url > 0) {
+ 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 * BLOCKSIZE);
+ print_size(net_boot_file_expected_size_in_blocks * BLOCKSIZE,
+ "");
+ }
+ debug_cond(DEBUG_WGET,
+ "\nwget:Load address: 0x%lx\nLoading: *\b", image_load_addr);
+
+ net_set_timeout_handler(wget_timeout, wget_timeout_handler);
+ tcp_set_tcp_handler(wget_handler);
+
+ wget_timeout_count = 0;
+ current_wget_state = WGET_CLOSED;
+
+ our_port = random_port();
+
+ /*
+ * Zero out server ether to forece apr resolution in case
+ * the server ip for the previous u-boot commsnd, for exanple dns
+ * is not the same as the web server ip.
+ */
+
+ memset(net_server_ethaddr, 0, 6);
+
+ wget_send(TCP_SYN, 0, 0, 0);
+}
--
2.35.1
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