shithub: mc

ref: a73b2d8351853bdfde84b2792b8b231472271284
dir: /lib/std/dial+posixy.myr/

use sys

use "alloc"
use "chartype"
use "die"
use "endian"
use "hasprefix"
use "intparse"
use "ipparse"
use "option"
use "resolve"
use "result"
use "slcp"
use "sleq"
use "strfind"
use "striter"
use "syswrap"
use "utf"

pkg std =
	const dial	: (dialstr : byte[:] -> result(fd, byte[:]))
;;

/*
 a map from service name to a list of (port,proto)
 pairs in order of preference
*/
/* FIXME: implement
var services : htab(byte[:], [int, byte[:]][:])#
var inited = false
*/

/* takes a plan 9 style dial string */
const dial = {ds
	match nameseg(ds)
	/*
	| `Some ("net", str):	-> guessdial(str)
	*/
	| `Some ("tcp", str):	-> dialsock(sys.Sockstream, str)
	| `Some ("udp", str):	-> dialsock(sys.Sockdgram, str)
	| `Some ("unix", u):	-> dialunix(u)
	| `Some (proto, str):	-> `Fail "unknown protocol"
	| `None:	-> `Fail "missing protocol"
	;;
}

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

	match nameseg(str)
	| `std.None:	-> `Fail "required host!port for ip dial"
	| `std.Some ("", _):	-> `Fail "empty host"
	| `std.Some (_, ""):	-> `Fail "empty host"
	| `std.Some segs:	(host, portstr) = segs
	;;

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

	match getaddr(host)
	| `Ipv4 bits:
		sa4=[.fam=sys.Afinet, .addr=bits, .port=hosttonet(port)]
		sa = &sa4 castto(sys.sockaddr#)
		sz = sizeof(sys.sockaddr_in)
	| `Ipv6 bits:
		sa6=[.fam=sys.Afinet6, .addr=bits, .port=hosttonet(port)]
		sa = &sa6 castto(sys.sockaddr#)
		sz = sizeof(sys.sockaddr_in6)
	;;
	sock = sys.socket(sa.fam, proto, 0)

	if sock < 0
		-> `Fail "failed to create socket"
	;;
	var err
	err = sys.connect(sock, sa, sz)
	if err < 0
		sys.close(sock)
		-> `Fail "Failed to bind socket"
	;;

	-> `Ok (sock castto(fd))
}

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

	sock = sys.socket(sys.Afunix, sys.Sockstream, 0)
	if sock < 0
		-> `Fail "failed to create socket"
	;;
	std.slcp(sa.path[:path.len], path)
	if sys.bind(sock, &sa castto(sys.sockaddr#), sizeof(sys.sockaddr_un)) < 0
		-> `Fail "failed to bind address"
	;;
	-> `std.Ok (sock castto(fd))
}

const parseport = {port
	match intparse(port)
	| `Some n:	-> `Some n
	| `None:
		/* a small number of hardcoded ports */
		if sleq(port, "http")
			-> `Some 80
		elif sleq(port, "https")
			-> `Some 443
		elif sleq(port, "ircd")
			-> `Some 6667
		elif sleq(port, "dns")
			-> `Some 53
		;;
	;;
	-> `None
}

const getaddr = {addr
	var ip

	match ipparse(addr)
	| `Some a:
		ip = a
	| `None:
		match resolve(addr)
		| `Ok hi:
			ip = hi[0].addr
			slfree(hi)
		| `Fail m:
		;;
	;;
	-> ip
}

const nameseg = {str
	match strfind(str, "!")
	| `Some idx:
		-> `Some (str[:idx], str[idx+1:])
	| `None:
		-> `None
	;;
}