v/vlib/net/socket.v

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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
proto int
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}
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struct C.in_addr {
mut:
s_addr int
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}
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struct C.sockaddr_in {
mut:
sin_family int
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sin_port int
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
ai_socktype int
ai_flags int
ai_protocol int
ai_addrlen int
ai_addr voidptr
ai_canonname voidptr
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ai_next voidptr
}
struct C.sockaddr_storage {
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}
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fn C.socket() int
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fn C.setsockopt() int
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fn C.htonl() int
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fn C.htons() int
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fn C.bind() int
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fn C.listen() int
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fn C.accept() int
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fn C.getaddrinfo() int
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fn C.connect() int
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fn C.send() int
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fn C.recv() int
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fn C.read() int
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fn C.shutdown() int
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fn C.close() int
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fn C.ntohs() int
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fn C.getsockname() int
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// create socket
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pub fn new_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
// same port after the application exits.
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C.setsockopt(sockfd, C.SOL_SOCKET, C.SO_REUSEADDR, &one, sizeof(int))
if sockfd == -1 {
return error('net.socket: failed')
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}
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s := Socket{
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sockfd: sockfd
family: family
_type: _type
proto: proto
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}
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return s
}
pub fn socket_udp() ?Socket {
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return new_socket(C.AF_INET, C.SOCK_DGRAM, C.IPPROTO_UDP)
}
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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, sizeof(&int))
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if res < 0 {
return error('net.setsocketopt: failed with $res')
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}
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return res
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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
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 := C.bind(s.sockfd, &addr, size)
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if res < 0 {
return error('net.bind: failed with $res')
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}
return res
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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 := C.listen(s.sockfd, backlog)
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if res < 0 {
return error('net.listen: failed with $res')
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}
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$if debug {
println('listen res = $res')
}
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return res
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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 {
mut n := 0
if backlog > 0 {
n = backlog
}
res := C.listen(s.sockfd, n)
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if res < 0 {
return error('net.listen_backlog: failed with $res')
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}
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return res
}
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// helper method to create, bind, and listen given port number
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pub fn listen(port int) ?Socket {
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$if debug {
println('net.listen($port)')
}
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s := new_socket(C.AF_INET, C.SOCK_STREAM, 0) or {
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return error(err)
}
_ = s.bind(port) or {
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return error(err)
}
_ = s.listen() or {
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return error(err)
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}
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return s
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}
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// accept first connection request from socket queue
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pub fn (s Socket) accept() ?Socket {
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$if debug {
println('accept()')
}
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addr := C.sockaddr_storage{
}
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size := 128 // sizeof(sockaddr_storage)
sockfd := C.accept(s.sockfd, &addr, &size)
if sockfd < 0 {
return error('net.accept: failed with $sockfd')
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}
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c := Socket{
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sockfd: sockfd
family: s.family
_type: s._type
proto: s.proto
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}
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return c
}
// connect to given addrress and port
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pub fn (s Socket) connect(address string, port int) ?int {
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mut hints := C.addrinfo{
}
hints.ai_family = s.family
hints.ai_socktype = s._type
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hints.ai_flags = C.AI_PASSIVE
hints.ai_protocol = s.proto
hints.ai_addrlen = 0
hints.ai_canonname = C.NULL
hints.ai_addr = C.NULL
hints.ai_next = C.NULL
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info := &C.addrinfo(0)
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sport := '$port'
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())
return error('net.connect: getaddrinfo failed "$error_message"')
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}
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res := C.connect(s.sockfd, info.ai_addr, info.ai_addrlen)
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if res < 0 {
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error_message := os.get_error_msg(net.error_code())
return error('net.connect: connect failed "$error_message"')
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}
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return 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 := new_socket(C.AF_INET, C.SOCK_STREAM, 0) or {
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return error(err)
}
_ = s.connect(address, port) or {
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return error(err)
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}
return s
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}
// send data to socket (when you have a memory buffer)
pub fn (s Socket) send(buf byteptr, len int) ?int {
mut dptr := buf
mut dlen := len
for {
sbytes := C.send(s.sockfd, dptr, dlen, MSG_NOSIGNAL)
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if sbytes < 0 {
return error('net.send: failed with $sbytes')
}
dlen -= sbytes
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if dlen <= 0 {
break
}
dptr += sbytes
}
return len
}
// send string data to socket (when you have a v string)
pub fn (s Socket) send_string(sdata string) ?int {
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return s.send(sdata.str, sdata.len)
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}
// receive string data from socket. NB: you are responsible for freeing the returned byteptr
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pub fn (s Socket) recv(bufsize int) (byteptr,int) {
mut buf := byteptr(0)
unsafe { buf = malloc(bufsize) }
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res := C.recv(s.sockfd, buf, bufsize, 0)
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return buf,res
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}
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// TODO: remove cread/2 and crecv/2 when the Go net interface is done
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pub fn (s Socket) cread(buffer byteptr, buffersize int) int {
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return C.read(s.sockfd, buffer, buffersize)
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}
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// Receive a message from the socket, and place it in a preallocated buffer buf,
// with maximum message size bufsize. Returns the length of the received message.
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pub fn (s Socket) crecv(buffer byteptr, buffersize int) int {
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return C.recv(s.sockfd, buffer, buffersize, 0)
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}
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// shutdown and close socket
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pub fn (s Socket) close() ?int {
mut shutdown_res := 0
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$if windows {
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shutdown_res = C.shutdown(s.sockfd, C.SD_BOTH)
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} $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
// continue even if shutdown failed
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// if shutdown_res < 0 {
// return error('net.close: shutdown failed with $shutdown_res')
// }
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mut res := 0
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$if windows {
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res = C.closesocket(s.sockfd)
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} $else {
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res = C.close(s.sockfd)
}
if res < 0 {
return error('net.close: failed with $res')
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}
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return 0
}
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pub const (
CRLF = '\r\n'
MAX_READ = 400
MSG_PEEK = 0x02
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)
// write - write a string with CRLF after it over the socket s
pub fn (s Socket) write(str string) ?int {
line := '$str$CRLF'
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res := C.send(s.sockfd, line.str, line.len, MSG_NOSIGNAL)
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if res < 0 {
return error('net.write: failed with $res')
}
return res
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}
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// read_line - retrieves a line from the socket s (i.e. a string ended with \n)
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pub fn (s Socket) read_line() string {
mut buf := [MAX_READ]byte // where C.recv will store the network data
mut res := '' // The final result, including the ending \n.
for {
mut line := '' // The current line. Can be a partial without \n in it.
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n := C.recv(s.sockfd, buf, MAX_READ - 1, MSG_PEEK)
if n == -1 {
return res
}
if n == 0 {
return res
}
buf[n] = `\0`
mut eol_idx := -1
for i in 0..n {
if int(buf[i]) == `\n` {
eol_idx = i
// Ensure that tos_clone(buf) later,
// will return *only* the first line (including \n),
// and ignore the rest
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buf[i + 1] = `\0`
break
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}
}
line = tos_clone(buf)
if eol_idx > 0 {
// At this point, we are sure that recv returned valid data,
// that contains *at least* one line.
// Ensure that the block till the first \n (including it)
// is removed from the socket's receive queue, so that it does
// not get read again.
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C.recv(s.sockfd, buf, eol_idx + 1, 0)
res += line
break
}
// recv returned a buffer without \n in it .
C.recv(s.sockfd, buf, n, 0)
res += line
res += CRLF
break
}
return res
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}
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// TODO
pub fn (s Socket) read_all() string {
mut buf := [MAX_READ]byte // where C.recv will store the network data
mut res := '' // The final result, including the ending \n.
for {
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n := C.recv(s.sockfd, buf, MAX_READ - 1, 0)
if n == -1 {
return res
}
if n == 0 {
return res
}
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res += tos_clone(buf)
}
return res
}
pub fn (s Socket) get_port() int {
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mut addr := C.sockaddr_in{
}
size := 16 // sizeof(sockaddr_in)
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C.getsockname(s.sockfd, &addr, &size)
return C.ntohs(addr.sin_port)
}