Implement two new functions for sending descriptor and receving descriptor

over UNIX domain sockets and socket pairs.
This is in preparation for capsicum.

MFC after:	1 week

1 files changed, 28 insertions, 0 deletions

diff --git a/sbin/hastd/proto_uds.c b/sbin/hastd/proto_uds.c
index a114c21..262d0c0 100644
--- a/sbin/hastd/proto_uds.c
+++ b/sbin/hastd/proto_uds.c
@@ -226,6 +226,32 @@ uds_recv(void *ctx, unsigned char *data, size_t size)
 }
 
 static int
+uds_descriptor_send(void *ctx, int fd)
+{
+	struct uds_ctx *uctx = ctx;
+
+	PJDLOG_ASSERT(uctx != NULL);
+	PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
+	PJDLOG_ASSERT(uctx->uc_fd >= 0);
+	PJDLOG_ASSERT(fd >= 0);
+
+	return (proto_common_descriptor_send(uctx->uc_fd, fd));
+}
+
+static int
+uds_descriptor_recv(void *ctx, int *fdp)
+{
+	struct uds_ctx *uctx = ctx;
+
+	PJDLOG_ASSERT(uctx != NULL);
+	PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
+	PJDLOG_ASSERT(uctx->uc_fd >= 0);
+	PJDLOG_ASSERT(fdp != NULL);
+
+	return (proto_common_descriptor_recv(uctx->uc_fd, fdp));
+}
+
+static int
 uds_descriptor(const void *ctx)
 {
 	const struct uds_ctx *uctx = ctx;
@@ -307,6 +333,8 @@ static struct hast_proto uds_proto = {
 	.hp_accept = uds_accept,
 	.hp_send = uds_send,
 	.hp_recv = uds_recv,
+	.hp_descriptor_send = uds_descriptor_send,
+	.hp_descriptor_recv = uds_descriptor_recv,
 	.hp_descriptor = uds_descriptor,
 	.hp_local_address = uds_local_address,
 	.hp_remote_address = uds_remote_address,