[PATCH v6 2/9] net: wget: add wget with dns utility function

[Masahisa Kojima]

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>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>
---
 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 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
-- 
2.34.1