[PATCHv5 05/13] net/lwip: implement tftp cmd

[Ilias Apalodimas]

On Wed, Aug 02, 2023 at 08:06:50PM +0600, Maxim Uvarov wrote:
> Signed-off-by: Maxim Uvarov <maxim.uvarov at linaro.org>
> ---
>  lib/lwip/Makefile              |   1 +
>  lib/lwip/apps/tftp/Makefile    |  16 +++++
>  lib/lwip/apps/tftp/lwip-tftp.c | 124 +++++++++++++++++++++++++++++++++
>  3 files changed, 141 insertions(+)
>  create mode 100644 lib/lwip/apps/tftp/Makefile
>  create mode 100644 lib/lwip/apps/tftp/lwip-tftp.c
> 
> diff --git a/lib/lwip/Makefile b/lib/lwip/Makefile
> index a3521a9d18..1893162c1a 100644
> --- a/lib/lwip/Makefile
> +++ b/lib/lwip/Makefile
> @@ -67,3 +67,4 @@ obj-$(CONFIG_NET) += port/sys-arch.o
>  
>  obj-$(CONFIG_CMD_DHCP) += apps/dhcp/lwip-dhcp.o
>  obj-$(CONFIG_CMD_DNS) += apps/dns/lwip-dns.o
> +obj-$(CONFIG_CMD_TFTPBOOT) += apps/tftp/
> diff --git a/lib/lwip/apps/tftp/Makefile b/lib/lwip/apps/tftp/Makefile
> new file mode 100644
> index 0000000000..299c95e9c0
> --- /dev/null
> +++ b/lib/lwip/apps/tftp/Makefile
> @@ -0,0 +1,16 @@
> +
> +ccflags-y += -I$(srctree)/lib/lwip/port/include
> +ccflags-y += -I$(srctree)/lib/lwip/lwip-external/src/include -I$(srctree)/lib/lwip
> +ccflags-y += -I$(obj)
> +
> +$(obj)/tftp.o: $(obj)/tftp.c
> +.PHONY: $(obj)/tftp.c
> +$(obj)/tftp.c:
> +	cp $(srctree)/lib/lwip/lwip-external/src/apps/tftp/tftp.c $(obj)/tftp.c
> +	cp $(srctree)/lib/lwip/lwip-external/src/include/lwip/apps/tftp_client.h $(obj)/tftp_client.h
> +	cp $(srctree)/lib/lwip/lwip-external/src/include/lwip/apps/tftp_common.h $(obj)/tftp_common.h
> +	cp $(srctree)/lib/lwip/lwip-external/contrib/examples/tftp/tftp_example.h $(obj)/tftp_example.h
> +
> +obj-$(CONFIG_CMD_TFTPBOOT) += tftp.o
> +obj-$(CONFIG_CMD_TFTPBOOT) += lwip-tftp.o
> +
> diff --git a/lib/lwip/apps/tftp/lwip-tftp.c b/lib/lwip/apps/tftp/lwip-tftp.c
> new file mode 100644
> index 0000000000..511d82e600
> --- /dev/null
> +++ b/lib/lwip/apps/tftp/lwip-tftp.c
> @@ -0,0 +1,124 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov at linaro.org>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <console.h>
> +
> +#include "lwip/apps/tftp_client.h"
> +#include "lwip/apps/tftp_server.h"
> +#include <tftp_example.h>
> +
> +#include <string.h>
> +
> +#include "../../../lwip/ulwip.h"
> +
> +#if LWIP_UDP
> +
> +static ulong daddr;
> +static ulong size;
> +
> +static void *tftp_open(const char *fname, const char *mode, u8_t is_write)
> +{
> +	LWIP_UNUSED_ARG(mode);
> +	return NULL;
> +}
> +
> +static void tftp_close(void *handle)
> +{
> +	printf("\ndone\n");
> +	printf("Bytes transferred = %ld (0x%lx hex)\n", size, size);

Can you replace all the printf occurences with log_XXXX ?

> +
> +	env_set_ulong("filesize", size);
> +	ulwip_exit(0);
> +}
> +
> +static int tftp_read(void *handle, void *buf, int bytes)
> +{
> +	return 0;
> +}
> +
> +static int tftp_write(void *handle, struct pbuf *p)
> +{
> +	struct pbuf *q;
> +
> +	for (q = p; q != NULL; q = q->next) {
> +		memcpy((void *)daddr, q->payload, q->len);
> +		/* printf("downloaded chunk size %d, to addr 0x%lx\n", q->len, daddr); */

Remove all those debug comments on  the next version 

> +		daddr += q->len;
> +		size += q->len;
> +		printf("#");
> +	}
> +
> +	return 0;
> +}
> +
> +/* For TFTP client only */
> +static void tftp_error(void *handle, int err, const char *msg, int size)
> +{
> +	char message[100];
> +
> +	LWIP_UNUSED_ARG(handle);
> +
> +	memset(message, 0, sizeof(message));
> +	MEMCPY(message, msg, LWIP_MIN(sizeof(message)-1, (size_t)size));

Why aren't we using the native memcpy?

> +
> +	printf("TFTP error: %d (%s)", err, message);
> +}
> +
> +static const struct tftp_context tftp = {
> +	tftp_open,
> +	tftp_close,
> +	tftp_read,
> +	tftp_write,
> +	tftp_error
> +};
> +
> +int lwip_tftp(ulong addr, char *fname)
> +{
> +	void *f = (void *)0x1; /*fake handle*/

If it's fake can't it just be NULL? What does 'fake' mean? is that safe to
be passed around the LWIP APIs?


> +	err_t err;
> +	ip_addr_t srv;
> +	int ret;
> +	char *server_ip;
> +
> +	if (!fname || addr == 0)
> +		return CMD_RET_FAILURE;
> +
> +	size = 0;
> +	daddr = addr;
> +	server_ip = env_get("serverip");
> +	if (!server_ip) {
> +		printf("error: serverip variable has to be set\n");
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	ret = ipaddr_aton(server_ip, &srv);
> +	LWIP_ASSERT("ipaddr_aton failed", ret == 1);
> +
> +	printf("TFTP from server %s; our IP address is %s\n",
> +			server_ip, env_get("ipaddr"));
> +	printf("Filename '%s'.\n", fname);
> +	printf("Load address: 0x%lx\n", daddr);
> +	printf("Loading:");
> +
> +	err = tftp_init_client(&tftp);
> +	if (!(err == ERR_OK || err == ERR_USE))
> +		printf("tftp_init_client err: %d\n", err);
> +
> +	err = tftp_get(f, &srv, TFTP_PORT, fname, TFTP_MODE_OCTET);
> +	/* might return different errors, like routing problems */
> +	if (err != ERR_OK) {
> +		printf("tftp_get err=%d\n", err);
> +	}
> +	LWIP_ASSERT("tftp_get failed", err == ERR_OK);
> +
> +	env_set_hex("fileaddr", addr);
> +	return err;
> +}
> +#else
> +#error "UDP has to be supported"
> +#endif /* LWIP_UDP */
> -- 
> 2.30.2
>