net: wget: add wget with dns utility function

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@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/net/wget.c b/net/wget.c
index 6f97eb1d12..2087146b37 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;
 
@@ -512,3 +513,56 @@ 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