Import lpd, a re-implementation of the lpr daemon following the latest

OpenBSD coding practices (fork+exec/privsep/pledge/...).  It is only
intended to replace the lpd(8) daemon for the moment, not the lpr(1),
lprm(1), lpq(1) and lpc(8) commands.

This is a work in progress.  The server part should be fairly functionnal,
but the printer part is not complete: remote printers should work, for
local printers it depends on the setup.  Anyway, at this point it's better
in the tree than rotting on my disk.

ok deraadt@

1 files changed, 85 insertions, 0 deletions

diff --git a/usr.sbin/lpd/io.h b/usr.sbin/lpd/io.h
new file mode 100644
index 00000000000..abd276eadd9
--- /dev/null
+++ b/usr.sbin/lpd/io.h
@@ -0,0 +1,85 @@
+/*	$OpenBSD: io.h,v 1.1.1.1 2018/04/27 16:14:36 eric Exp $	*/
+
+/*
+ * Copyright (c) 2017 Eric Faurot <eric@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <event.h>
+
+enum {
+	IO_CONNECTED = 0, 	/* connection successful	*/
+	IO_TLSREADY,		/* TLS started successfully	*/
+	IO_DATAIN,		/* new data in input buffer	*/
+	IO_LOWAT,		/* output queue running low	*/
+	IO_CLOSED,		/* normally terminated		*/
+	IO_DISCONNECTED,	/* error?			*/
+	IO_TIMEOUT,		/* error?			*/
+	IO_ERROR,		/* details?			*/
+	IO_TLSERROR,		/* XXX - needs more work	*/
+};
+
+#define IO_IN	0x1
+#define IO_OUT	0x2
+
+struct io;
+
+void io_trace(int);
+const char* io_strio(struct io *);
+const char* io_strevent(int);
+
+/* IO management */
+struct io *io_new(void);
+void	io_free(struct io *);
+
+/* IO setup */
+int	io_set_callback(struct io *, void(*)(struct io *, int, void *), void *);
+int	io_set_bindaddr(struct io *, const struct sockaddr *);
+int	io_set_bufsize(struct io *, size_t);
+void	io_set_timeout(struct io *, int);
+void	io_set_lowat(struct io *, size_t);
+
+/* State retreival */
+const char *io_error(struct io *);
+int	io_fileno(struct io *);
+
+/* Connection management */
+int	io_attach(struct io *io, int);
+int	io_detach(struct io *io);
+int	io_close(struct io *io);
+int	io_connect(struct io *, struct addrinfo *);
+int	io_disconnect(struct io *io);
+int	io_starttls(struct io *, void *);
+
+/* Flow control  */
+void	io_pause(struct io *, int);
+void	io_resume(struct io *, int);
+
+/* IO direction */
+void	io_set_read(struct io *);
+void	io_set_write(struct io *);
+
+/* Output buffering */
+int	io_write(struct io *, const void *, size_t);
+int	io_writev(struct io *, const struct iovec *, int);
+int	io_print(struct io *, const char *);
+int	io_printf(struct io *, const char *, ...);
+int	io_vprintf(struct io *, const char *, va_list);
+size_t	io_queued(struct io *);
+
+/* Buffered input */
+void *	io_data(struct io *);
+size_t	io_datalen(struct io *);
+char *	io_getline(struct io *, size_t *);
+void	io_drop(struct io *, size_t);