From c04fbe3df564c66b0f4261a4013ea349ab41418c Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 23 Nov 2019 23:41:10 +0100
Subject: static: Make thread-safe

---
 plugins/static/static.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/plugins/static/static.c b/plugins/static/static.c
index 2fb6e0f..0b39afe 100644
--- a/plugins/static/static.c
+++ b/plugins/static/static.c
@@ -2,15 +2,16 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
-#include <assert.h>
 #include <errno.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include "memory.h"
 #include "plugin.h"
 #include "util.h"
 #include "buffer.h"
 
 
+// Will only be set once in the registration function, which is before any threading is done
 static char *static_file_dir = NULL;
 
 
@@ -29,20 +30,9 @@ static bool path_allowed(const char *path) {
 	return true;
 }
 
-// Returns pointer to internal buffer, don't free
-static const char* make_relative_path(const char *path) {
-	static char *rel = NULL;
-	static size_t rel_cap = 0;
-
-	size_t necessary = strlen(static_file_dir) + 1 + strlen(path) + 1;
-	if (necessary >= rel_cap) {
-		rel_cap = necessary;
-		rel = realloc(rel, rel_cap);
-		assert(rel);
-	}
-
+static char* make_relative_path(const char *path) {
+	char *rel = malloc(strlen(static_file_dir) + 1 + strlen(path) + 1, char);
 	sprintf(rel, "%s/%s", static_file_dir, path);
-
 	return rel;
 }
 
@@ -98,33 +88,39 @@ static void send_500(int sock) {
 }
 
 static Handler_ret_t connection_handler(int sock, Headers *headers) {
+	char *path = NULL;
+	struct buffer buffer;
+	buffer.buf = NULL;
+
 	if (!path_allowed(headers->url)) {
 		send_404(sock);
-		return HR_HANDLED;
+		goto cleanup_return;
 	}
 
-	const char *path = make_relative_path(headers->url);
+	path = make_relative_path(headers->url);
 
 	ssize_t size = query_file_size(path);
 	if (size < 0) {
 		if (errno == ENOENT || errno == EISDIR) {
 			send_404(sock);
-			return HR_HANDLED;
+			goto cleanup_return;
 		} else {
 			send_500(sock);
-			return HR_HANDLED;
+			goto cleanup_return;
 		}
 	}
 
-	struct buffer buffer = build_response_headers("200 OK", "text/plain; charset=UTF-8", size);
+	buffer = build_response_headers("200 OK", "text/plain; charset=UTF-8", size);
 	if (!buffer_append_file(&buffer, path)) {
-		buffer_free(buffer);
 		send_500(sock);
-		return HR_HANDLED;
+		goto cleanup_return;
 	}
 
 	sendall(sock, buffer.buf, buffer.len);
-	buffer_free(buffer);
+
+cleanup_return:
+	if (buffer.buf) buffer_free(buffer);
+	if (path) free(path);
 	return HR_HANDLED;
 }
 
-- 
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