298 lines
6.7 KiB
V
298 lines
6.7 KiB
V
module net
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import os
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pub struct Socket {
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pub:
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sockfd int
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family int
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_type int
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proto int
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}
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struct C.in_addr {
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mut:
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s_addr int
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}
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struct C.sockaddr_in {
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mut:
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sin_family int
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sin_port int
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sin_addr C.in_addr
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}
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struct C.addrinfo {
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mut:
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ai_family int
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ai_socktype int
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ai_flags int
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ai_protocol int
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ai_addrlen int
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ai_addr voidptr
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ai_canonname voidptr
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ai_next voidptr
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}
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struct C.sockaddr_storage {}
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// create socket
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pub fn socket(family int, _type int, proto int) ?Socket {
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sockfd := C.socket(family, _type, proto)
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one:=1
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// This is needed so that there are no problems with reusing the
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// same port after the application exits.
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C.setsockopt(sockfd, C.SOL_SOCKET, C.SO_REUSEADDR, &one, sizeof(int))
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if sockfd == 0 {
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return error('net.socket: failed')
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}
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s := Socket {
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sockfd: sockfd
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family: family
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_type: _type
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proto: proto
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}
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return s
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}
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pub fn socket_udp() ?Socket {
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return socket(C.AF_INET, C.SOCK_DGRAM, C.IPPROTO_UDP)
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}
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// set socket options
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pub fn (s Socket) setsockopt(level int, optname int, optvalue &int) ?int {
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res := C.setsockopt(s.sockfd, level, optname, optvalue, C.sizeof(optvalue))
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if res < 0 {
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return error('net.setsocketopt: failed with $res')
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}
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return int(res)
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}
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// bind socket to port
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pub fn (s Socket) bind(port int) ?int {
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mut addr := C.sockaddr_in{}
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addr.sin_family = s.family
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addr.sin_port = C.htons(port)
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addr.sin_addr.s_addr = C.htonl(C.INADDR_ANY)
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size := 16 // sizeof(C.sockaddr_in)
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res := int(C.bind(s.sockfd, &addr, size))
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if res < 0 {
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return error('net.bind: failed with $res')
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}
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return res
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}
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// put socket into passive mode and wait to receive
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pub fn (s Socket) listen() ?int {
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backlog := 128
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res := int(C.listen(s.sockfd, backlog))
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if res < 0 {
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return error('net.listen: failed with $res')
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}
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$if debug {
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println('listen res = $res')
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}
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return res
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}
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// put socket into passive mode with user specified backlog and wait to receive
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pub fn (s Socket) listen_backlog(backlog int) ?int {
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mut n := 0
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if backlog > 0 {
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n = backlog
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}
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res := C.listen(s.sockfd, n)
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if res < 0 {
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return error('net.listen_backlog: failed with $res')
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}
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return int(res)
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}
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// helper method to create, bind, and listen given port number
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pub fn listen(port int) ?Socket {
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$if debug {
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println('net.listen($port)')
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}
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s := socket(C.AF_INET, C.SOCK_STREAM, 0) or {
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return error(err)
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}
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bind_res := s.bind(port) or {
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return error(err)
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}
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listen_res := s.listen() or {
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return error(err)
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}
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return s
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}
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// accept first connection request from socket queue
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pub fn (s Socket) accept() ?Socket {
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$if debug {
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println('accept()')
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}
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addr := C.sockaddr_storage{}
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size := 128 // sizeof(sockaddr_storage)
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sockfd := C.accept(s.sockfd, &addr, &size)
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if sockfd < 0 {
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return error('net.accept: failed with $sockfd')
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}
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c := Socket {
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sockfd: sockfd
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family: s.family
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_type: s._type
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proto: s.proto
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}
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return c
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}
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// connect to given addrress and port
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pub fn (s Socket) connect(address string, port int) ?int {
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mut hints := C.addrinfo{}
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hints.ai_family = s.family
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hints.ai_socktype = s._type
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hints.ai_flags = C.AI_PASSIVE
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hints.ai_protocol = s.proto
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hints.ai_addrlen = 0
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hints.ai_canonname = C.NULL
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hints.ai_addr = C.NULL
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hints.ai_next = C.NULL
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info := &C.addrinfo{!}
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sport := '$port'
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info_res := C.getaddrinfo(address.str, sport.str, &hints, &info)
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if info_res != 0 {
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error_message := os.get_error_msg(net.error_code())
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return error('net.connect: getaddrinfo failed "$error_message"')
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}
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res := int(C.connect(s.sockfd, info.ai_addr, info.ai_addrlen))
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if res < 0 {
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error_message := os.get_error_msg(net.error_code())
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return error('net.connect: connect failed "$error_message"')
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}
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return int(res)
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}
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// helper method to create socket and connect
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pub fn dial(address string, port int) ?Socket {
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s := socket(C.AF_INET, C.SOCK_STREAM, 0) or {
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return error(err)
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}
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res := s.connect(address, port) or {
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return error(err)
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}
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return s
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}
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// send string data to socket
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pub fn (s Socket) send(buf byteptr, len int) ?int {
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res := int( C.send(s.sockfd, buf, len, 0) )
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if res < 0 {
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return error('net.send: failed with $res')
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}
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return res
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}
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// receive string data from socket
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pub fn (s Socket) recv(bufsize int) (byteptr, int) {
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buf := malloc(bufsize)
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res := int( C.recv(s.sockfd, buf, bufsize, 0) )
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return buf, res
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}
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// TODO: remove cread/2 and crecv/2 when the Go net interface is done
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pub fn (s Socket) cread( buffer byteptr, buffersize int ) int {
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return int( C.read(s.sockfd, buffer, buffersize) )
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}
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// Receive a message from the socket, and place it in a preallocated buffer buf,
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// with maximum message size bufsize. Returns the length of the received message.
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pub fn (s Socket) crecv( buffer byteptr, buffersize int ) int {
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return int( C.recv(s.sockfd, buffer, buffersize, 0) )
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}
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// shutdown and close socket
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pub fn (s Socket) close() ?int {
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mut shutdown_res := 0
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$if windows {
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shutdown_res = C.shutdown(s.sockfd, C.SD_BOTH)
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}
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$else {
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shutdown_res = C.shutdown(s.sockfd, C.SHUT_RDWR)
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}
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// TODO: should shutdown throw an error? close will
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// continue even if shutdown failed
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// if shutdown_res < 0 {
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// return error('net.close: shutdown failed with $shutdown_res')
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// }
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mut res := 0
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$if windows {
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res = C.closesocket(s.sockfd)
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}
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$else {
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res = C.close(s.sockfd)
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}
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if res < 0 {
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return error('net.close: failed with $res')
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}
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return 0
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}
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const (
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MAX_READ = 400
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)
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pub fn (s Socket) write(str string) {
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line := '$str\r\n'
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C.send(s.sockfd, line.str, line.len, 0)
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}
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pub fn (s Socket) read_line() string {
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mut res := ''
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for {
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$if debug {
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println('.')
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}
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mut buf := malloc(MAX_READ)
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n := int(C.recv(s.sockfd, buf, MAX_READ-1, 0))
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$if debug {
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println('numbytes=$n')
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}
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if n == -1 {
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$if debug {
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println('recv failed')
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}
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// TODO
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return ''
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}
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if n == 0 {
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break
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}
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// println('resp len=$numbytes')
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buf[n] = `\0`
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// C.printf('!!buf= "%s" n=%d\n', buf,n)
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line := string(buf)
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res += line
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// Reached a newline. That's an end of an IRC message
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// TODO dont need ends_with check ?
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if line.ends_with('\n') || n < MAX_READ - 1 {
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// println('NL')
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break
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}
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if line.ends_with('\r\n') {
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// println('RNL')
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break
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}
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}
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return res
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}
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pub fn (s Socket) get_port() int {
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mut addr := C.sockaddr_in {}
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size := 16 // sizeof(sockaddr_in)
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sockname_res := C.getsockname(s.sockfd, &addr, &size)
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return int(C.ntohs(addr.sin_port))
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}
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