[PATCH v4 2/8] net: wget: add wget with dns utility function

[Ilias Apalodimas]

On Fri, Sep 22, 2023 at 04:11:13PM +0900, Masahisa Kojima wrote:
> Current wget takes the target uri in this format:
>  "<http server ip>:<file path>"  e.g.) 192.168.1.1:/bar
> The http server ip address must be resolved before
> calling wget.
>
> This commit adds the utility function runs wget with dhs.
> User can call wget with the uri like "http://foo/bar".
>
> Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
> ---
>  include/net.h |  9 +++++++++
>  net/wget.c    | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 63 insertions(+)
>
> diff --git a/include/net.h b/include/net.h
> index e254df7d7f..57889d8b7a 100644
> --- a/include/net.h
> +++ b/include/net.h
> @@ -926,4 +926,13 @@ void eth_set_enable_bootdevs(bool enable);
>  static inline void eth_set_enable_bootdevs(bool enable) {}
>  #endif
>
> +/**
> + * wget_with_dns() - runs dns host IP address resulution before wget
> + *
> + * @dst_addr:	destination address to download the file
> + * @uri:	uri string of target file of wget
> + * Return:	downloaded file size, negative if failed
> + */
> +int wget_with_dns(ulong dst_addr, char *uri);
> +
>  #endif /* __NET_H__ */
> diff --git a/net/wget.c b/net/wget.c
> index a48a8cb624..4801e28eb9 100644
> --- a/net/wget.c
> +++ b/net/wget.c
> @@ -15,6 +15,7 @@
>  #include <net.h>
>  #include <net/tcp.h>
>  #include <net/wget.h>
> +#include <stdlib.h>
>
>  DECLARE_GLOBAL_DATA_PTR;
>
> @@ -504,3 +505,56 @@ void wget_start(void)
>
>  	wget_send(TCP_SYN, 0, 0, 0);
>  }
> +
> +#if (IS_ENABLED(CONFIG_CMD_DNS))
> +int wget_with_dns(ulong dst_addr, char *uri)
> +{
> +	int ret;
> +	char *s, *host_name, *file_name, *str_copy;
> +
> +	/*
> +	 * Download file using wget.
> +	 *
> +	 * U-Boot wget takes the target uri in this format.
> +	 *  "<http server ip>:<file path>"  e.g.) 192.168.1.1:/sample/test.iso
> +	 * Need to resolve the http server ip address before starting wget.
> +	 */
> +	str_copy = strdup(uri);
> +	if (!str_copy)
> +		return -ENOMEM;
> +
> +	s = str_copy + strlen("http://");
> +	host_name = strsep(&s, "/");
> +	if (!s) {
> +		log_err("Error: invalied uri, no file path\n");
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +	file_name = s;
> +
> +	/* TODO: If the given uri has ip address for the http server, skip dns */
> +	net_dns_resolve = host_name;
> +	net_dns_env_var = "httpserverip";
> +	if (net_loop(DNS) < 0) {
> +		log_err("Error: dns lookup of %s failed, check setup\n", net_dns_resolve);
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +	s = env_get("httpserverip");
> +	if (!s) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	strlcpy(net_boot_file_name, s, sizeof(net_boot_file_name));
> +	strlcat(net_boot_file_name, ":/", sizeof(net_boot_file_name)); /* append '/' which is removed by strsep() */
> +	strlcat(net_boot_file_name, file_name, sizeof(net_boot_file_name));
> +	image_load_addr = dst_addr;
> +	ret = net_loop(WGET);
> +
> +out:
> +	free(str_copy);
> +
> +	return ret;
> +}
> +#endif
> --
> 2.34.1
>

This can be done better when we integrate LWIP but for now

Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>