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, 53 insertions, 0 deletions

diff --git a/addr.c b/addr.c
new file mode 100644
index 0000000..1dddaff
--- /dev/null
+++ b/addr.c
@@ -0,0 +1,53 @@
+#include <string.h>
+
+#include "addr.h"
+
+int addr_len(const sockaddr_any *addr)
+{
+	switch (addr->any.sa_family) {
+	case AF_INET:
+		return sizeof(struct sockaddr_in);
+	default:
+		return 0;
+	}
+}
+
+sockaddr_any *addr_parse(blob_t b, sockaddr_any *addr)
+{
+	memset(addr, 0, sizeof(*addr));
+	addr->ipv4.sin_family = AF_INET;
+	addr->ipv4.sin_addr.s_addr = blob_inet_addr(b);
+	if (addr->ipv4.sin_addr.s_addr == -1)
+		return NULL;
+	return addr;
+}
+
+unsigned long addr_hash(const sockaddr_any *addr)
+{
+	switch (addr->any.sa_family) {
+	case AF_INET:
+		return htonl(addr->ipv4.sin_addr.s_addr);
+	default:
+		return 0;
+	}
+}
+
+const char *addr_print(const sockaddr_any *addr)
+{
+	switch (addr->any.sa_family) {
+	case AF_INET:
+		return inet_ntoa(addr->ipv4.sin_addr);
+	default:
+		return "unknown";
+	}
+}
+
+blob_t addr_get_hostaddr_blob(const sockaddr_any *addr)
+{
+	switch (addr->any.sa_family) {
+	case AF_INET:
+		return BLOB_BUF(&addr->ipv4.sin_addr);
+	default:
+		return BLOB_NULL;
+	}
+}