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// socket.go -- Socket handling.

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Low-level socket interface.
// Only for implementing net package.
// DO NOT USE DIRECTLY.

package syscall

import "unsafe"

// For testing: clients can set this flag to force
// creation of IPv6 sockets to return EAFNOSUPPORT.
var SocketDisableIPv6 bool

type Sockaddr interface {
        sockaddr() (ptr *RawSockaddrAny, len Socklen_t, err error) // lowercase; only we can define Sockaddrs
}

type RawSockaddrAny struct {
        Addr RawSockaddr
        Pad  [12]int8
}

const SizeofSockaddrAny = 0x1c

type SockaddrInet4 struct {
        Port int
        Addr [4]byte
        raw  RawSockaddrInet4
}

func (sa *SockaddrInet4) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
        if sa.Port < 0 || sa.Port > 0xFFFF {
                return nil, 0, EINVAL
        }
        sa.raw.Family = AF_INET
        n := sa.raw.setLen()
        p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
        p[0] = byte(sa.Port >> 8)
        p[1] = byte(sa.Port)
        for i := 0; i < len(sa.Addr); i++ {
                sa.raw.Addr[i] = sa.Addr[i]
        }
        return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), n, nil
}

type SockaddrInet6 struct {
        Port   int
        ZoneId uint32
        Addr   [16]byte
        raw    RawSockaddrInet6
}

func (sa *SockaddrInet6) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
        if sa.Port < 0 || sa.Port > 0xFFFF {
                return nil, 0, EINVAL
        }
        sa.raw.Family = AF_INET6
        n := sa.raw.setLen()
        p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
        p[0] = byte(sa.Port >> 8)
        p[1] = byte(sa.Port)
        sa.raw.Scope_id = sa.ZoneId
        for i := 0; i < len(sa.Addr); i++ {
                sa.raw.Addr[i] = sa.Addr[i]
        }
        return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), n, nil
}

type SockaddrUnix struct {
        Name string
        raw  RawSockaddrUnix
}

func (sa *SockaddrUnix) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
        name := sa.Name
        n := len(name)
        if n >= len(sa.raw.Path) || n == 0 {
                return nil, 0, EINVAL
        }
        sa.raw.Family = AF_UNIX
        sa.raw.setLen(n)
        for i := 0; i < n; i++ {
                sa.raw.Path[i] = int8(name[i])
        }
        if sa.raw.Path[0] == '@' {
                sa.raw.Path[0] = 0
        }

        // length is family (uint16), name, NUL.
        return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), 2 + Socklen_t(n) + 1, nil
}

func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
        switch rsa.Addr.Family {
        case AF_UNIX:
                pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
                sa := new(SockaddrUnix)
                n, err := pp.getLen()
                if err != nil {
                        return nil, err
                }
                bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
                sa.Name = string(bytes[0:n])
                return sa, nil

        case AF_INET:
                pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
                sa := new(SockaddrInet4)
                p := (*[2]byte)(unsafe.Pointer(&pp.Port))
                sa.Port = int(p[0])<<8 + int(p[1])
                for i := 0; i < len(sa.Addr); i++ {
                        sa.Addr[i] = pp.Addr[i]
                }
                return sa, nil

        case AF_INET6:
                pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
                sa := new(SockaddrInet6)
                p := (*[2]byte)(unsafe.Pointer(&pp.Port))
                sa.Port = int(p[0])<<8 + int(p[1])
                for i := 0; i < len(sa.Addr); i++ {
                        sa.Addr[i] = pp.Addr[i]
                }
                return sa, nil
        }
        return anyToSockaddrOS(rsa)
}

//sys   accept(fd int, sa *RawSockaddrAny, len *Socklen_t) (nfd int, err error)
//accept(fd int, sa *RawSockaddrAny, len *Socklen_t) int

func Accept(fd int) (nfd int, sa Sockaddr, err error) {
        var rsa RawSockaddrAny
        var len Socklen_t = SizeofSockaddrAny
        nfd, err = accept(fd, &rsa, &len)
        if err != nil {
                return
        }
        sa, err = anyToSockaddr(&rsa)
        if err != nil {
                Close(nfd)
                nfd = 0
        }
        return
}

//sysnb getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) (err error)
//getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) int

func Getsockname(fd int) (sa Sockaddr, err error) {
        var rsa RawSockaddrAny
        var len Socklen_t = SizeofSockaddrAny
        if err = getsockname(fd, &rsa, &len); err != nil {
                return
        }
        return anyToSockaddr(&rsa)
}

//sysnb getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) (err error)
//getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) int

func Getpeername(fd int) (sa Sockaddr, err error) {
        var rsa RawSockaddrAny
        var len Socklen_t = SizeofSockaddrAny
        if err = getpeername(fd, &rsa, &len); err != nil {
                return
        }
        return anyToSockaddr(&rsa)
}

//sys   bind(fd int, sa *RawSockaddrAny, len Socklen_t) (err error)
//bind(fd int, sa *RawSockaddrAny, len Socklen_t) int

func Bind(fd int, sa Sockaddr) (err error) {
        ptr, n, err := sa.sockaddr()
        if err != nil {
                return err
        }
        return bind(fd, ptr, n)
}

//sys   connect(s int, addr *RawSockaddrAny, addrlen Socklen_t) (err error)
//connect(s int, addr *RawSockaddrAny, addrlen Socklen_t) int

func Connect(fd int, sa Sockaddr) (err error) {
        ptr, n, err := sa.sockaddr()
        if err != nil {
                return err
        }
        return connect(fd, ptr, n)
}

//sysnb socket(domain int, typ int, proto int) (fd int, err error)
//socket(domain int, typ int, protocol int) int

func Socket(domain, typ, proto int) (fd int, err error) {
        if domain == AF_INET6 && SocketDisableIPv6 {
                return -1, EAFNOSUPPORT
        }
        fd, err = socket(domain, typ, proto)
        return
}

//sysnb socketpair(domain int, typ int, proto int, fd *[2]int) (err error)
//socketpair(domain int, typ int, protocol int, fd *[2]int) int

func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
        err = socketpair(domain, typ, proto, &fd)
        return
}

//sys   getsockopt(s int, level int, name int, val uintptr, vallen *Socklen_t) (err error)
//getsockopt(s int, level int, name int, val *byte, vallen *Socklen_t) int

func GetsockoptInt(fd, level, opt int) (value int, err error) {
        var n int32
        vallen := Socklen_t(4)
        err = getsockopt(fd, level, opt, (uintptr)(unsafe.Pointer(&n)), &vallen)
        return int(n), err
}

func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
        vallen := Socklen_t(4)
        err = getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value[0])), &vallen)
        return value, err
}

func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
        var value IPMreq
        vallen := Socklen_t(SizeofIPMreq)
        err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
        return &value, err
}

func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
        var value IPMreqn
        vallen := Socklen_t(SizeofIPMreqn)
        err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
        return &value, err
}

func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
        var value IPv6Mreq
        vallen := Socklen_t(SizeofIPv6Mreq)
        err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
        return &value, err
}

//sys   setsockopt(s int, level int, name int, val *byte, vallen Socklen_t) (err error)
//setsockopt(s int, level int, optname int, val *byte, vallen Socklen_t) int

func SetsockoptInt(fd, level, opt int, value int) (err error) {
        var n = int32(value)
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&n)), 4)
}

func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&value[0])), 4)
}

func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(tv)), Socklen_t(unsafe.Sizeof(*tv)))
}

type Linger struct {
        Onoff  int32
        Linger int32
}

func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(l)), Socklen_t(unsafe.Sizeof(*l)))
}

func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}

func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}

func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}

func SetsockoptString(fd, level, opt int, s string) (err error) {
        return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&[]byte(s)[0])), Socklen_t(len(s)))
}

//sys   recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *Socklen_t) (n int, err error)
//recvfrom(fd int, buf *byte, len Size_t, flags int, from *RawSockaddrAny, fromlen *Socklen_t) Ssize_t

func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
        var rsa RawSockaddrAny
        var len Socklen_t = SizeofSockaddrAny
        if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
                return
        }
        from, err = anyToSockaddr(&rsa)
        return
}

//sys   sendto(s int, buf []byte, flags int, to *RawSockaddrAny, tolen Socklen_t) (err error)
//sendto(s int, buf *byte, len Size_t, flags int, to *RawSockaddrAny, tolen Socklen_t) Ssize_t

func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
        ptr, n, err := to.sockaddr()
        if err != nil {
                return err
        }
        return sendto(fd, p, flags, ptr, n)
}

//sys   recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
//recvmsg(s int, msg *Msghdr, flags int) Ssize_t

func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
        var msg Msghdr
        var rsa RawSockaddrAny
        msg.Name = (*byte)(unsafe.Pointer(&rsa))
        msg.Namelen = uint32(SizeofSockaddrAny)
        var iov Iovec
        if len(p) > 0 {
                iov.Base = (*byte)(unsafe.Pointer(&p[0]))
                iov.SetLen(len(p))
        }
        var dummy byte
        if len(oob) > 0 {
                // receive at least one normal byte
                if len(p) == 0 {
                        iov.Base = &dummy
                        iov.SetLen(1)
                }
                msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
                msg.SetControllen(len(oob))
        }
        msg.Iov = &iov
        msg.Iovlen = 1
        if n, err = recvmsg(fd, &msg, flags); err != nil {
                return
        }
        oobn = int(msg.Controllen)
        recvflags = int(msg.Flags)
        // source address is only specified if the socket is unconnected
        if rsa.Addr.Family != AF_UNSPEC {
                from, err = anyToSockaddr(&rsa)
        }
        return
}

//sys   sendmsg(s int, msg *Msghdr, flags int) (err error)
//sendmsg(s int, msg *Msghdr, flags int) Ssize_t

func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
        var ptr *RawSockaddrAny
        var salen Socklen_t
        if to != nil {
                var err error
                ptr, salen, err = to.sockaddr()
                if err != nil {
                        return err
                }
        }
        var msg Msghdr
        msg.Name = (*byte)(unsafe.Pointer(ptr))
        msg.Namelen = uint32(salen)
        var iov Iovec
        if len(p) > 0 {
                iov.Base = (*byte)(unsafe.Pointer(&p[0]))
                iov.SetLen(len(p))
        }
        var dummy byte
        if len(oob) > 0 {
                // send at least one normal byte
                if len(p) == 0 {
                        iov.Base = &dummy
                        iov.SetLen(1)
                }
                msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
                msg.SetControllen(len(oob))
        }
        msg.Iov = &iov
        msg.Iovlen = 1
        if err = sendmsg(fd, &msg, flags); err != nil {
                return
        }
        return
}

//sys   Listen(fd int, n int) (err error)
//listen(fd int, n int) int

//sys   Shutdown(fd int, how int) (err error)
//shutdown(fd int, how int) int

func (iov *Iovec) SetLen(length int) {
        iov.Len = Iovec_len_t(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
        msghdr.Controllen = Msghdr_controllen_t(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
        cmsg.Len = Cmsghdr_len_t(length)
}