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, 50 insertions, 0 deletions

diff --git a/authdb.h b/authdb.h
new file mode 100644
index 0000000..5a3f3c4
--- /dev/null
+++ b/authdb.h
@@ -0,0 +1,50 @@
+#ifndef AUTHDB_H
+#define AUTHDB_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include "blob.h"
+#include "addr.h"
+
+#define AUTHDB_IP_HASH_SIZE		64
+
+struct authdb_map_entry;
+
+struct authdb {
+	struct authdb_map_entry	*hash_bucket[AUTHDB_IP_HASH_SIZE];
+};
+
+struct authdb_entry {
+	struct {
+		char		login_name[44];
+		char		mac_address[6];
+		uint16_t	switch_port;
+		sockaddr_any	switch_ip;
+		uint64_t	block_categories;
+		uint64_t	hard_block_categories;
+	} p;
+
+	struct {
+		uint32_t	login_time;
+		uint32_t	override_time;
+		uint32_t	checksum;
+	} u;
+};
+
+struct authdb_map_entry {
+	struct authdb_map_entry	*next;
+	sockaddr_any		baseaddr;
+	struct authdb_entry *	entries;
+};
+
+int authdb_open(struct authdb *adb);
+void authdb_close(struct authdb *adb);
+
+void *authdb_get(struct authdb *adb, sockaddr_any *addr, struct authdb_entry *entry, int create);
+
+void authdb_clear_entry(struct authdb_entry *entry);
+int authdb_set(void *token, struct authdb_entry *entry);
+int authdb_check_login(void *token, struct authdb_entry *e, blob_t username, time_t now);
+void authdb_commit_login(void *token, struct authdb_entry *e, time_t now);
+
+#endif