Implememt client-side basic auth

* lib/Makefile.am: Add base64.c
* lib/base64.c: New file.
* lib/basicauth.c: Move base64 support to a separate source.
* lib/basicauth.h (base64_encode,base64_decode): New protos.

* src/strsplit.c: New file.
* src/Makefile.am (libping903_a_SOURCES): Add strsplit.c
* src/defs.h (CRED_FILE_NAME): New macro.
(ecalloc,strsplit,argcv_free): New proto.
* src/mem.c (ecalloc): New function.
* src/ping903.c (strsplit): Remove.
(cf_auth): Use modified strsplit.
* src/ping903q.c (http_query): Attempt to authenticate
if basic auth is required.

* examples/lib/LWP/Ping903.pm: New file.
* examples/dbload: Use LWP::Ping903
* examples/inspect: Likewise.
* examples/ipadd: Likewise.
* examples/ipdel: Likewise.

1 files changed, 85 insertions, 0 deletions

diff --git a/lib/base64.c b/lib/base64.c
new file mode 100644
index 0000000..ad07a5a
--- /dev/null
+++ b/lib/base64.c
@@ -0,0 +1,85 @@
+#include <config.h>
+#include <stdlib.h>
+#include <errno.h>
+
+static char b64tab[] =
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+int
+base64_encode(const unsigned char *input, size_t input_len,
+	      unsigned char **output, size_t *output_len)
+{
+	size_t olen = 4 * (input_len + 2) / 3 + 1;
+	unsigned char *out = malloc(olen);
+
+	if (!out)
+		return -1;
+	*output = out;
+	while (input_len >= 3) {
+		*out++ = b64tab[input[0] >> 2];
+		*out++ = b64tab[((input[0] << 4) & 0x30) | (input[1] >> 4)];
+		*out++ = b64tab[((input[1] << 2) & 0x3c) | (input[2] >> 6)];
+		*out++ = b64tab[input[2] & 0x3f];
+		input_len -= 3;
+		input += 3;
+	}
+
+	if (input_len > 0) {
+		unsigned char c = (input[0] << 4) & 0x30;
+		*out++ = b64tab[input[0] >> 2];
+		if (input_len > 1)
+			c |= input[1] >> 4;
+		*out++ = b64tab[c];
+		*out++ = (input_len < 2) ?
+			        '=' : b64tab[(input[1] << 2) & 0x3c];
+		*out++ = '=';
+	}
+	*output_len = out - *output;
+	*out = 0;
+	return 0;
+}
+
+static int b64val[128] = {
+    	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
+	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+	-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
+};
+
+int
+base64_decode(const unsigned char *input, size_t input_len,
+              unsigned char *output, size_t output_len)
+{
+	unsigned char *out = output;
+#define AC(c) do { if (output_len-- == 0) return -1; *out++ = (c); } while (0)
+	
+    	if (!out)
+        	return -1;
+
+    	do {
+        	if (input[0] > 127 || b64val[input[0]] == -1 || 
+                    input[1] > 127 || b64val[input[1]] == -1 || 
+                    input[2] > 127 || 
+                    ((input[2] != '=') && (b64val[input[2]] == -1)) || 
+                    input[3] > 127 || 
+                    ((input[3] != '=') && (b64val[input[3]] == -1))) {
+            		errno = EINVAL;
+            		return -1;
+        	}
+        	AC((b64val[input[0]] << 2) | (b64val[input[1]] >> 4));
+        	if (input[2] != '=') {
+            		AC(((b64val[input[1]] << 4) & 0xf0) | 
+                           (b64val[input[2]] >> 2));
+            		if (input[3] != '=')
+                		AC(((b64val[input[2]] << 6) & 0xc0) | 
+                                    b64val[input[3]]);
+        	}
+        	input += 4;
+        	input_len -= 4;
+    	} while (input_len > 0);
+    	return out - output;
+}