authdb: implement basics

Implement a shared memory based authentication cache. It's a simple
local cache indexed by IP-address, and keeps track of that IP's
auth info such as username, allowed categories and timeouts. This
provides basis for captive portal, per-user definable category
restrictions and implementation of soft blocks (block which can
be overridden by user by clicking a button on the blocked page).

1 files changed, 31 insertions, 0 deletions

diff --git a/addr.h b/addr.h
new file mode 100644
index 0000000..00e1833
--- /dev/null
+++ b/addr.h
@@ -0,0 +1,31 @@
+#ifndef ADDR_H
+#define ADDR_H
+
+#include <arpa/inet.h>
+#include "blob.h"
+
+typedef union {
+	struct sockaddr		any;
+	struct sockaddr_in	ipv4;
+} sockaddr_any;
+
+int addr_len(const sockaddr_any *addr);
+sockaddr_any *addr_parse(blob_t text, sockaddr_any *addr);
+unsigned long addr_hash(const sockaddr_any *addr);
+const char *addr_print(const sockaddr_any *addr);
+blob_t addr_get_hostaddr_blob(const sockaddr_any *addr);
+
+static inline void addr_copy(sockaddr_any *dst, const sockaddr_any *src)
+{
+	memcpy(dst, src, addr_len(src));
+}
+
+static inline int addr_cmp(const sockaddr_any *a, const sockaddr_any *b)
+{
+	if (a->any.sa_family != b->any.sa_family)
+		return -1;
+	return memcmp(a, b, addr_len(a));
+}
+
+#endif
+