From 642b5fb0007b64c77d186fcb018d571152ee1d47 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 14 Aug 2023 18:51:07 +0200
Subject: reorganization: first steps

---
 src/cmd/httpd/httpd.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/cmd/httpd/httpd.c

(limited to 'src/cmd/httpd/httpd.c')

diff --git a/src/cmd/httpd/httpd.c b/src/cmd/httpd/httpd.c
new file mode 100644
index 0000000..668e534
--- /dev/null
+++ b/src/cmd/httpd/httpd.c
@@ -0,0 +1,77 @@
+/* garbage httpd, just to see if it works
+ * easily DoSable (like the rest of the network stack), vulnerable to path traversal, etc */
+#include <camellia/flags.h>
+#include <camellia/syscalls.h>
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static void handle(FILE *c) {
+	char buf[2048];
+	fgets(buf, sizeof buf, c);
+	printf("%s", buf);
+
+	if (memcmp(buf, "GET /", 5) != 0) {
+		fprintf(c, "HTTP/1.1 400 Bad Request\r\n\r\n");
+		return;
+	}
+	char *path = buf + 4;
+	char *end = strchr(path, ' ');
+	if (end) *end = '\0';
+
+	hid_t h = _sys_open(path, strlen(path), OPEN_READ);
+	if (h < 0) {
+		fprintf(c, "HTTP/1.1 404 Not Found\r\n\r\n");
+		return;
+	}
+	FILE *f = fdopen(h, "r");
+	if (!f) {
+		fprintf(c, "HTTP/1.1 500 Internal Server Error\r\n\r\n");
+		return;
+	}
+
+	if (path[strlen(path) - 1] != '/') {
+		/* regular file */
+		fprintf(c, "HTTP/1.1 200 OK\r\n");
+		fprintf(c, "\r\n");
+		for (;;) {
+			int len = fread(buf, 1, sizeof buf, f);
+			if (len <= 0) break;
+			fwrite(buf, 1, len, c);
+		}
+	} else {
+		/* directory listing */
+		fprintf(c, "HTTP/1.1 200 OK\r\n");
+		fprintf(c, "Content-Type: text/html; charset=UTF-8\r\n");
+		fprintf(c, "\r\n");
+		fprintf(c, "<h1>directory listing for %s</h1><hr><ul><li><a href=..>..</a></li>", path);
+		for (;;) {
+			int len = fread(buf, 1, sizeof buf, f);
+			if (len <= 0) break;
+			// TODO directory library
+			// based on find.c
+			for (int pos = 0; pos < len; ) {
+				if (buf[pos] == '\0') break;
+				const char *end = memchr(buf + pos, 0, len - pos);
+				if (!end) break;
+				fprintf(c, "<li><a href=\"%s\">%s</a></li>", buf + pos, buf + pos);
+				pos += end - (buf + pos) + 1;
+			}
+		}
+	}
+	fclose(f);
+}
+
+int main(int argc, char **argv) {
+	const char *path = (argc > 1) ? argv[1] : "/net/listen/0.0.0.0/tcp/80";
+	hid_t conn;
+	for (;;) {
+		conn = _sys_open(path, strlen(path), OPEN_RW);
+		if (conn < 0)
+			errx(1, "open('%s') failed, errno %d", path, -conn);
+		FILE *f = fdopen(conn, "a+");
+		handle(f);
+		fclose(f);
+	}
+}
-- 
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