From c1bb6177e79b6ad139bb8cbe37c598937c406263 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 31 Dec 2012 18:29:35 +0100
Subject: [PATCH] fix 404 and 403 error handling, improve error message output

---
 client.c | 21 ++++++++++-----------
 file.c   | 46 ++++++++++++++++++++++++++++++----------------
 2 files changed, 40 insertions(+), 27 deletions(-)

diff --git a/client.c b/client.c
index 9e387c7..e1c8c55 100644
--- a/client.c
+++ b/client.c
@@ -51,12 +51,6 @@ void uh_http_header(struct client *cl, int code, const char *summary)
 		code, summary, conn, enc);
 }
 
-static void uh_client_error_header(struct client *cl, int code, const char *summary)
-{
-	uh_http_header(cl, code, summary);
-	ustream_printf(cl->us, "Content-Type: text/plain\r\n\r\n");
-}
-
 static void uh_connection_close(struct client *cl)
 {
 	cl->state = CLIENT_STATE_DONE;
@@ -92,18 +86,23 @@ uh_client_error(struct client *cl, int code, const char *summary, const char *fm
 {
 	va_list arg;
 
-	uh_client_error_header(cl, code, summary);
+	uh_http_header(cl, code, summary);
+	ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
+
+	uh_chunk_printf(cl, "<h1>%s</h1>", summary);
 
-	va_start(arg, fmt);
-	uh_chunk_vprintf(cl, fmt, arg);
-	va_end(arg);
+	if (fmt) {
+		va_start(arg, fmt);
+		uh_chunk_vprintf(cl, fmt, arg);
+		va_end(arg);
+	}
 
 	uh_request_done(cl);
 }
 
 static void uh_header_error(struct client *cl, int code, const char *summary)
 {
-	uh_client_error(cl, code, summary, "%s", summary);
+	uh_client_error(cl, code, summary, NULL);
 	uh_connection_close(cl);
 }
 
diff --git a/file.c b/file.c
index fa37155..7091ef7 100644
--- a/file.c
+++ b/file.c
@@ -70,7 +70,6 @@ static char * canonpath(const char *path, char *path_resolved)
 	char path_copy[PATH_MAX];
 	char *path_cpy = path_copy;
 	char *path_res = path_resolved;
-	struct stat s;
 
 	/* relative -> absolute */
 	if (*path != '/') {
@@ -122,11 +121,7 @@ next:
 
 	*path_res = '\0';
 
-	/* test access */
-	if (!stat(path_resolved, &s) && (s.st_mode & S_IROTH))
-		return path_resolved;
-
-	return NULL;
+	return path_resolved;
 }
 
 /* Returns NULL on error.
@@ -593,7 +588,7 @@ static void uh_file_data(struct client *cl, struct path_info *pi, int fd)
 	file_write_cb(cl);
 }
 
-static void uh_file_request(struct client *cl, struct path_info *pi)
+static void uh_file_request(struct client *cl, struct path_info *pi, const char *url)
 {
 	static const struct blobmsg_policy hdr_policy[__HDR_MAX] = {
 		[HDR_IF_MODIFIED_SINCE] = { "if-modified-since", BLOBMSG_TYPE_STRING },
@@ -608,14 +603,31 @@ static void uh_file_request(struct client *cl, struct path_info *pi)
 	blobmsg_parse(hdr_policy, __HDR_MAX, tb, blob_data(cl->hdr.head), blob_len(cl->hdr.head));
 
 	cl->data.file.hdr = tb;
-	if ((pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0))
+
+	if (!(pi->stat.st_mode & S_IROTH))
+		goto error;
+
+	if (pi->stat.st_mode & S_IFREG) {
+		fd = open(pi->phys, O_RDONLY);
+		if (fd < 0)
+			goto error;
+
 		uh_file_data(cl, pi, fd);
-	else if ((pi->stat.st_mode & S_IFDIR) && !conf.no_dirlists)
+	} else if ((pi->stat.st_mode & S_IFDIR)) {
+		if (conf.no_dirlists)
+			goto error;
+
 		uh_file_dirlist(cl, pi);
-	else
-		uh_client_error(cl, 403, "Forbidden",
-				"Access to this resource is forbidden");
-	cl->data.file.hdr = NULL;
+	} else {
+		goto error;
+	}
+
+	return;
+
+error:
+	uh_client_error(cl, 403, "Forbidden",
+			"You don't have permission to access %s on this server.",
+			url);
 }
 
 static bool __handle_file_request(struct client *cl, const char *url)
@@ -626,8 +638,10 @@ static bool __handle_file_request(struct client *cl, const char *url)
 	if (!pi)
 		return false;
 
-	if (!pi->redirected)
-		uh_file_request(cl, pi);
+	if (!pi->redirected) {
+		uh_file_request(cl, pi, url);
+		cl->data.file.hdr = NULL;
+	}
 
 	return true;
 }
@@ -638,5 +652,5 @@ void uh_handle_file_request(struct client *cl)
 	    __handle_file_request(cl, conf.error_handler))
 		return;
 
-	uh_client_error(cl, 404, "Not Found", "No such file or directory");
+	uh_client_error(cl, 404, "Not Found", "The requested URL %s was not found on this server.", cl->request.url);
 }
-- 
2.25.1