net: low level socket api
Justice Suh
Alexander Medvednikov
parent
d09758f723
commit
571410dd48
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@ -1,32 +1,44 @@
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module net
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#include <netdb.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <netdb.h>
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struct Conn {
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struct Socket {
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pub:
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sockfd int
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}
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struct Listener {
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listener int
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their_addr voidptr
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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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import const (
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AF_UNSPEC
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AF_INET
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AF_INET6
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AF_UNSPEC
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SOCK_STREAM
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AI_PASSIVE
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PF_INET
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SOL_SOCKET
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SO_REUSEADDR
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SO_REUSEPORT
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INADDR_ANY
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AI_PASSIVE
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SHUT_RD
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SHUT_WR
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SHUT_RDWR
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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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@ -38,113 +50,120 @@ mut:
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ai_addr voidptr
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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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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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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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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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// 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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return res
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}
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struct C.sockaddr_storage {
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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(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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return res
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}
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fn dial(addr string, port int) Conn {
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println('net.dial("$addr":$port)')
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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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return 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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s := socket(AF_INET, SOCK_STREAM, 0)
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if s.sockfd == 0 {
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println('socket: init socket failed')
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return s
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}
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bind_res := s.bind(port)
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if bind_res < 0 {
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println('socket: bind failed')
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return s
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}
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listen_res := s.listen()
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if listen_res < 0 {
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println('socket: listen failed')
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return s
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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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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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println('socket: accept failed')
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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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servinfo := &C.addrinfo{!}
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mut rp := &C.addrinfo{!}
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mut sockfd := -1
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// allow IPv4 or IPv6
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hints.ai_family = AF_UNSPEC
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// avoid name lookup for port
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// hints.ai_flags = AI_NUMERICSERV
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hints.ai_socktype = SOCK_STREAM
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hints.ai_flags = AI_PASSIVE
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strport := '$port'
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connbad := Conn{}
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c_addr := addr.cstr()
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rv := C.getaddrinfo(c_addr, strport.cstr(), &hints, &servinfo)
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if rv != 0 {
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println('Getaddrinfo failed ')
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return connbad
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info := &C.addrinfo{!}
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sport := '$port'
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info_res := C.getaddrinfo(address.cstr(), sport.cstr(), &hints, &info)
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if info_res != 0 {
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println('socket: getaddrinfo failed')
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return info_res
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}
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// Loop through all the results and connect to the first we can
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for rp = servinfo; !isnil(rp); rp = rp.ai_next {
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sockfd = C.socket(rp.ai_family, rp.ai_socktype, rp.ai_protocol)
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if sockfd == -1 {
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continue
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}
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if C.connect(sockfd, rp.ai_addr, rp.ai_addrlen) {
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C.close(sockfd)
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continue
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}
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break
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}
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if sockfd == -1 {
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println('socket: Cannot connect to host')
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return connbad
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}
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C.freeaddrinfo(servinfo)
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conn := Conn {
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sockfd: sockfd,
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}
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return conn
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res := C.connect(s.sockfd, info.ai_addr, info.ai_addrlen)
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return res
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}
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fn listen(addr string, port int) Listener {
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mut hints := C.addrinfo{}
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res := &C.addrinfo{!}
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new_fd := 0
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BACKLOG := 10
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strport := port.str()
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option := 1
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listener := C.socket(PF_INET, SOCK_STREAM, 0)
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C.setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(int))
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bad_listener := Listener{their_addr: 0}
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if listener < 0 {
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println('couldnt create listen scoket')
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return bad_listener
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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(AF_INET, SOCK_STREAM, 0)
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res := s.connect(address, port)
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if res < 0 {
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println('socket: failed to connect')
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}
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// socket address used for the server
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mut server_address := C.sockaddr_in{}
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server_address.sin_family = AF_INET
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// htons: host to network short: transforms a value in host byte
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// ordering format to a short value in network byte ordering format
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server_address.sin_port = C.htons(port)
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// htonl: host to network long: same as htons but to long
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server_address.sin_addr.s_addr = C.htonl(INADDR_ANY)
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size := 16 // sizeof(C.sockaddr_in)
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if C.bind(listener, &server_address, size) < 0 {
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println('cant bind')
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return bad_listener
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}
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if C.listen(listener, BACKLOG) < 0 {
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println('cant listen')
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return bad_listener
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}
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l := Listener {
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listener: listener,
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their_addr: 0
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}
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return l
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return s
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}
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// accept an incoming connection
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fn (l Listener) accept() Conn {
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their_addr := C.sockaddr_storage{}
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addr_size := 128 // sizeof (l.their_addr)
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return Conn {
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sockfd: C.accept(l.listener, &their_addr, &addr_size)
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// shutdown and close socket
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pub fn (s Socket) close() int {
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shutdown_res := C.shutdown(s.sockfd, SHUT_RDWR)
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if shutdown_res < 0 {
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println('socket: shutdown failed')
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}
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res := C.close(s.sockfd)
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if res < 0 {
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println('socket: close failed')
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}
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return 0
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}
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@ -1,6 +1,14 @@
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import net
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fn test_dial() {
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//conn := net.dial('irc.freenode.org', 6667)
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//println(conn.sockfd)
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fn test_socket() {
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// server := net.listen(8080)
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// println(server)
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// client := net.dial('127.0.0.1', 8080)
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// println(client)
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// socket := server.accept()
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// println(socket)
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//
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// server.close()
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// client.close()
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// socket.close()
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}
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