[MEDIUM] added the new 'stats' keyword with user authentication subsystem.
Right now it only validates the user/passwd according to a specified list,
and lets the user pass through the proxy if the authentication is OK, and
it refuses any invalid access with a 401 Unauthorized response.
diff --git a/src/base64.c b/src/base64.c
new file mode 100644
index 0000000..79e86c2
--- /dev/null
+++ b/src/base64.c
@@ -0,0 +1,57 @@
+/*
+ * Ascii to Base64 conversion as described in RFC1421.
+ * Copyright 2006 Willy Tarreau <willy@w.ods.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <include/base64.h>
+
+
+/* Encodes <ilen> bytes from <in> to <out> for at most <olen> chars (including
+ * the trailing zero). Returns the number of bytes written. No check is made
+ * for <in> or <out> to be NULL. Returns negative value if <olen> is too short
+ * to accept <ilen>. 4 output bytes are produced for 1 to 3 input bytes.
+ */
+int a2base64(char *in, int ilen, char *out, int olen)
+{
+ char base64[64]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ int convlen;
+
+ convlen = ((ilen + 2) / 3) * 4;
+
+ if (convlen >= olen)
+ return -1;
+
+ /* we don't need to check olen anymore */
+ while (ilen >= 3) {
+ out[0] = base64[(((unsigned char)in[0]) >> 2)];
+ out[1] = base64[(((unsigned char)in[0] & 0x03) << 4) | (((unsigned char)in[1]) >> 4)];
+ out[2] = base64[(((unsigned char)in[1] & 0x0F) << 2) | (((unsigned char)in[2]) >> 6)];
+ out[3] = base64[(((unsigned char)in[2] & 0x3F))];
+ out += 4;
+ in += 3; ilen -= 3;
+ }
+
+ if (!ilen) {
+ out[0] = '\0';
+ } else {
+ out[0] = base64[((unsigned char)in[0]) >> 2];
+ if (ilen == 1) {
+ out[1] = base64[((unsigned char)in[0] & 0x03) << 4];
+ out[2] = '=';
+ } else {
+ out[1] = base64[(((unsigned char)in[0] & 0x03) << 4) |
+ (((unsigned char)in[1]) >> 4)];
+ out[2] = base64[((unsigned char)in[1] & 0x0F) << 2];
+ }
+ out[3] = '=';
+ out[4] = '\0';
+ }
+
+ return convlen;
+}