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module network
use iso_c_binding
implicit none
integer(kind=c_int), parameter::AF_INET = 2
integer(kind=c_int), parameter::AF_INET6 = 10
integer(kind=c_int), parameter::AF_UNIX = 1
integer(kind=c_int), parameter::SOCK_STREAM = 1
type, bind(c) :: in_addr
integer(kind=c_int32_t)::s_addr
end type
type, bind(c) :: sockaddr_in
integer(kind=c_short)::sin_family
integer(kind=c_int16_t)::sin_port
type(in_addr)::sin_addr
!integer(kind=c_int32_t)::s_addr
end type
type, bind(c) :: hostent_c
type(c_ptr)::h_name !official name of host */
type(c_ptr)::h_aliases !alias list */
integer(kind=c_int):: h_addrtype !host address type */
integer(kind=c_int):: h_length !length of address */
type(c_ptr)::h_addr_list !list of addresses */
end type
! Let's keep this simple...
type :: simple_hostent
character(len=:), allocatable::h_name
integer::h_addrtype
integer(kind=c_int32_t)::h_addr4
integer(kind=c_int64_t)::h_addr6
end type
integer(kind=c_size_t), parameter::sockaddr_size = 56
interface
function socket_c(i, j, k) bind(c, name="socket")
use iso_c_binding
integer(kind=c_int), value::i, j, k
integer(kind=c_int)::socket_c
end function socket_c
function inet_addr_c(str) bind(c, name="inet_addr")
use iso_c_binding
type(c_ptr), value::str
integer(c_int32_t)::inet_addr_c
end function inet_addr_c
function htons(i) bind(c)
use iso_c_binding
integer(kind=c_int32_t), value::i
integer(kind=c_int32_t)::htons
end function htons
function connect_c(sockfd, sock_addr, socklen) bind(c, name="connect")
use iso_c_binding
import::sockaddr_in
integer(kind=c_int), value::sockfd
type(c_ptr), value::sock_addr
integer(kind=c_size_t), value::socklen
integer(kind=c_int)::connect_c
end function connect_c
function gethostbyname_c(host) bind(c, name="gethostbyname")
use iso_c_binding
type(c_ptr), value::host
type(c_ptr)::gethostbyname_c
end function gethostbyname_c
end interface
contains
function socket(domain, stype, protocol)
use iso_c_binding, only: c_int
implicit none
integer::socket
integer, intent(in)::domain, stype, protocol
socket = socket_c(int(domain, c_int), int(stype, c_int), int(protocol, c_int))
end function socket
function inet_addr(str)
use iso_c_binding
implicit none
character(*), intent(in)::str
integer(c_int32_t)::inet_addr
character(kind=c_char), dimension(:), allocatable, target::cstr
integer::i
allocate(cstr(len_trim(str)+1))
do i=1, len_trim(str)
cstr(i) = str(i:i)
end do
cstr(len_trim(str)+1) = c_null_char
inet_addr = inet_addr_c(c_loc(cstr))
deallocate(cstr)
end function inet_addr
function connect(sockfd, sock_addr)
use iso_c_binding
implicit none
integer::sockfd
type(sockaddr_in), target::sock_addr
logical::connect
!print *, c_sizeof(sock_addr)
connect = (connect_c(int(sockfd, kind=c_int), &
c_loc(sock_addr), &
sockaddr_size) .eq. 0)
end function connect
function gethostbyname(host, success) result(res)
use iso_c_binding
implicit none
character(*)::host
type(simple_hostent)::res
type(hostent_c), pointer::cres
type(c_ptr)::callres
logical, intent(out), optional::success
! To get the host to C
character(kind=c_char), dimension(:), allocatable, target::chost
integer::i
! To process h_name
character(kind=c_char), dimension(:), pointer::h_name
! To process h_addr
type(c_ptr), dimension(:), pointer::addrptr
integer(kind=c_int32_t), pointer::addr32
integer(kind=c_int64_t), pointer::addr64
allocate(chost(len_trim(host)+1))
do i=1, len_trim(host)
chost(i) = host(i:i)
end do
chost(len_trim(host)+1) = c_null_char
callres = gethostbyname_c(c_loc(chost))
if(c_associated(callres)) then
call c_f_pointer(callres, cres)
! Extract the name
call c_f_pointer(cres%h_name, h_name, [1])
i = 1
do while(h_name(i) /= c_null_char)
i = i + 1
end do
allocate(character(len=i) :: res%h_name)
i = 1
do while(h_name(i) /= c_null_char)
res%h_name(i:i) = h_name(i)
i = i + 1
end do
! And address
res%h_addr4 = 0
res%h_addr6 = 0
res%h_addrtype = cres%h_addrtype
call c_f_pointer(cres%h_addr_list, addrptr, [1])
if(res%h_addrtype == AF_INET) then
call c_f_pointer(addrptr(1), addr32)
res%h_addr4 = addr32
else if(res%h_addrtype == AF_INET6) then
call c_f_pointer(addrptr(1), addr64)
res%h_addr6 = addr64
end if
if(present(success)) then
success = .TRUE.
end if
else
if(present(success)) then
success = .FALSE.
end if
end if
end function gethostbyname
end module network
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