shithub: mc

ref: 0b5b219f27ff55efda4f33df0ca3cd87140be712
dir: /lib/std/listen+posixy.myr/

use sys

use "alloc"
use "chartype"
use "dialparse"
use "die"
use "endian"
use "mk"
use "option"
use "resolve"
use "result"
use "slcp"
use "sleq"
use "strfind"
use "striter"
use "syswrap"
use "traits"
use "utf"

pkg std =
	type announce = struct
		lfd	: fd
	;;

	const announce	: (ds : byte[:] -> result(announce#, byte[:]))
	const aclose	: (a : announce# -> void)
	const accept	: (a : announce# -> result(fd, byte[:]))
;;

const announce = {ds
	match nameseg(ds)
	| `Some ("tcp", str):	-> announcesock(sys.Sockstream, str)
	| `Some ("udp", str):	-> announcesock(sys.Sockdgram, str)
	| `Some ("unix", str):	-> announceunix(str)
	| `Some (proto, str):	-> `Err "unknown protocol"
	| `None:	-> `Err "missing protocol"
	;;
}

const aclose = {a
	close(a.lfd)
	free(a)
}

const announcesock = {proto, str
	var sa4 : sys.sockaddr_in
	var sa6 : sys.sockaddr_in6
	var sa	: sys.sockaddr#
	var hoststr, portstr, port
	var sock, sz
	var yes

	match nameseg(str)
	| `None:	-> `Err "required addr!port for ip listen"
	| `Some ("", _):	-> `Err "empty host"
	| `Some (_, ""):	-> `Err "empty port"
	| `Some segs:	(hoststr, portstr) = segs
	;;

	match parseport(portstr)
	| `Some p:	port = p
	| `None:	-> `Err("invalid port")
	;;

	if eq(hoststr, "*")
		sa6=[.fam=sys.Afinet6, .port=hosttonet(port)]
		sa = (&sa6 : sys.sockaddr#)
		sz = sizeof(sys.sockaddr_in6)
	else
		match getaddr(hoststr)
		| `Ok `Ipv4 bits:
			sa4=[.fam=sys.Afinet, .addr=bits, .port=hosttonet(port)]
			sa = (&sa4 : sys.sockaddr#)
			sz = sizeof(sys.sockaddr_in)
		| `Ok `Ipv6 bits:
			sa6=[.fam=sys.Afinet6, .addr=bits, .port=hosttonet(port)]
			sa = (&sa6 : sys.sockaddr#)
			sz = sizeof(sys.sockaddr_in6)
		| `Err m:
			-> `Err m
		;;
	;;
	sock = sys.socket(sa.fam, proto, 0)
	if sock < 0
		-> `Err "failed to create socket"
	;;
	yes = 1
	if sys.setsockopt(sock, sys.Solsocket, sys.Soreuseaddr, (&yes : void#), sizeof(int)) < 0
		-> `Err "failed to set sock opts"
	;;
	if sys.bind(sock, sa, sz) < 0
		-> `Err "failed to bind socket"
	;;
	if proto == sys.Sockstream
		if sys.listen((sock : sys.fd), 10) < 0
			-> `Err "unable to listen on socket"
		;;
	;;
	-> `Ok mk([.lfd=(sock : fd)])
}

const announceunix = {path
	var sa : sys.sockaddr_un
	var sock
	var yes
	
	sa = [.fam = sys.Afunix]
	if path.len >= sa.path.len
		-> `Err "path too long"
	;;

	slcp(sa.path[:path.len], path)
	sock = sys.socket(sys.Afunix, sys.Sockstream, 0)
	if sock < 0
		-> `Err "failed to create socket"
	;;
	yes = 1
	if sys.setsockopt(sock, sys.Solsocket, sys.Soreuseaddr, (&yes : void#), sizeof(int)) < 0
		-> `Err "failed to set sock opts"
	;;
	sys.unlink(path)
	if sys.bind(sock, (&sa : sys.sockaddr#), sizeof(sys.sockaddr_un)) < 0
		-> `Err "failed to bind address"
	;;
	if sys.listen((sock : sys.fd), 10) < 0
		-> `Err "unable to listen on socket"
	;;
	-> `Ok mk([.lfd=(sock : fd)])

}

const accept = {a
	var sa : sys.sockaddr_storage
	var len : sys.size
	var fd

	fd = sys.accept((a.lfd : sys.fd), (0 : sys.sockaddr#), (0 : sys.size#))
	if fd < 0
		-> `Err "unable to accept socket"
	;;
	-> `Ok (fd : fd)
}