[PATCH 02/15] net: wget: let wget_with_dns work with dns disabled

[Heinrich Schuchardt]

Am 8. November 2024 04:45:01 MEZ schrieb Adriano Cordova <adrianox at gmail.com>:
>This was marked as TODO in the code:
>-Enable use of wget_with_dns even if CMD_DNS is disabled if
>the given uri has the ip address for the http server.
>-Check for port in the uri when transforming to legacy wget
>syntax inside wget_with_dns.
>-Move the check for CMD_DNS inside wget_with_dns.
>
>Signed-off-by: Adriano Cordova <adrianox at gmail.com>
>---
> net/wget.c | 38 ++++++++++++++++++++++++--------------
> 1 file changed, 24 insertions(+), 14 deletions(-)
>
>diff --git a/net/wget.c b/net/wget.c
>index 2d931c2bc6..5bb61a2b8d 100644
>--- a/net/wget.c
>+++ b/net/wget.c
>@@ -528,12 +528,10 @@ 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;
>-
>+	char *s, *host_name, *file_name, *str_copy, *port;
> 	/*
> 	 * Download file using wget.
> 	 *
>@@ -554,18 +552,31 @@ int wget_with_dns(ulong dst_addr, char *uri)
> 	}
> 	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) {
>+	port = host_name;
>+	host_name = strsep(&port, ":");
>+
>+	if (string_to_ip(host_name).s_addr != 0) {
>+		s = host_name;
>+	} else {
>+#if (IS_ENABLED(CONFIG_CMD_DNS))

The U-Boot project prefers to use 'if' instead of #if' (if it compiles). This allows the compiler to check both paths for syntax and then eliminate the unused one. We are using the -O2 optimization setting.

If you run scripts/checkpatch.pl, you will see a warning.

>+		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) {
>+			log_err("Error:  %s could not be resolved\n", net_dns_resolve);
>+			ret = -EINVAL;
>+			goto out;
>+		}
>+#else
>+		log_err("Error: dns disabled, %s could not be resolved\n", host_name);

I would tend to remove "Error:" in all messages as it provides no additional information.

Best regards

Heinrich

> 		ret = -EINVAL;
> 		goto out;
>+#endif
> 	}
> 
> 	strlcpy(net_boot_file_name, s, sizeof(net_boot_file_name));
>@@ -579,7 +590,6 @@ out:
> 
> 	return ret < 0 ? ret : 0;
> }
>-#endif
> 
> /**
>  * wget_validate_uri() - validate the uri for wget