netaddr: routines to linearize/delinearize.

For putting them in the database.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/netaddr.c

@@ -1,6 +1,12 @@
+#include "bitcoin/pullpush.h"
 #include "netaddr.h"
+#include "utils.h"
 #include <arpa/inet.h>
+#include <assert.h>
 #include <ccan/cast/cast.h>
+#include <ccan/endian/endian.h>
+#include <ccan/short_types/short_types.h>
+#include <ccan/str/hex/hex.h>
 #include <ccan/tal/str/str.h>
 #include <netdb.h>
 #include <stdio.h>
@@ -42,3 +48,32 @@ char *netaddr_name(const tal_t *ctx, const struct netaddr *a)
 
 	return tal_fmt(ctx, "%s:%u", name, port);
 }
+
+char *netaddr_to_hex(const tal_t *ctx, const struct netaddr *a)
+{
+	u8 *blob = tal_arr(ctx, u8, 0);
+	char *hex;
+
+	push_le32(a->type, push, &blob);
+	push_le32(a->protocol, push, &blob);
+	push_le32(a->addrlen, push, &blob);
+	assert(a->addrlen <= sizeof(a->saddr));
+	push(&a->saddr, a->addrlen, &blob);
+
+	hex = tal_hexstr(ctx, blob, tal_count(blob));
+	tal_free(blob);
+	return hex;
+}
+
+bool netaddr_from_blob(const void *linear, size_t len, struct netaddr *a)
+{
+	const u8 *p = linear;
+
+	a->type = pull_le32(&p, &len);
+	a->protocol = pull_le32(&p, &len);
+	a->addrlen = pull_le32(&p, &len);
+	if (a->addrlen > sizeof(a->saddr))
+		return false;
+	pull(&p, &len, &a->saddr, a->addrlen);
+	return p != NULL && len == 0;
+}

daemon/netaddr.h

@@ -26,4 +26,7 @@ char *netaddr_name(const tal_t *ctx, const struct netaddr *a);
 /* Create a addrinfo (as wanted by io_connect) for this address. */
 void netaddr_to_addrinfo(struct addrinfo *ai, const struct netaddr *a);
 
+bool netaddr_from_blob(const void *linear, size_t len, struct netaddr *a);
+char *netaddr_to_hex(const tal_t *ctx, const struct netaddr *a);
+
 #endif /* LIGHTNING_DAEMON_NETADDR_H */