261 lines
6.5 KiB
C
261 lines
6.5 KiB
C
/************************************************
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udpsocket.c -
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created at: Thu Mar 31 12:21:29 JST 1994
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Copyright (C) 1993-2007 Yukihiro Matsumoto
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************************************************/
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#include "rubysocket.h"
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/*
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* call-seq:
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* UDPSocket.new([address_family]) => socket
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*
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* Creates a new UDPSocket object.
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*
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* _address_family_ should be an integer, a string or a symbol:
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* Socket::AF_INET, "AF_INET", :INET, etc.
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*
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* UDPSocket.new #=> #<UDPSocket:fd 3>
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* UDPSocket.new(Socket::AF_INET6) #=> #<UDPSocket:fd 4>
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*
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*/
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static VALUE
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udp_init(int argc, VALUE *argv, VALUE sock)
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{
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VALUE arg;
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int family = AF_INET;
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int fd;
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rb_secure(3);
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if (rb_scan_args(argc, argv, "01", &arg) == 1) {
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family = rsock_family_arg(arg);
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}
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fd = rsock_socket(family, SOCK_DGRAM, 0);
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if (fd < 0) {
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rb_sys_fail("socket(2) - udp");
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}
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return rsock_init_sock(sock, fd);
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}
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struct udp_arg
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{
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struct addrinfo *res;
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int fd;
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};
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static VALUE
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udp_connect_internal(struct udp_arg *arg)
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{
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int fd = arg->fd;
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struct addrinfo *res;
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for (res = arg->res; res; res = res->ai_next) {
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if (rsock_connect(fd, res->ai_addr, res->ai_addrlen, 0) >= 0) {
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return Qtrue;
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}
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}
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return Qfalse;
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}
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/*
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* call-seq:
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* udpsocket.connect(host, port) => 0
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*
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* Connects _udpsocket_ to _host_:_port_.
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*
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* This makes possible to send without destination address.
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*
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* u1 = UDPSocket.new
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* u1.bind("127.0.0.1", 4913)
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* u2 = UDPSocket.new
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* u2.connect("127.0.0.1", 4913)
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* u2.send "uuuu", 0
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* p u1.recvfrom(10) #=> ["uuuu", ["AF_INET", 33230, "localhost", "127.0.0.1"]]
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*
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*/
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static VALUE
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udp_connect(VALUE sock, VALUE host, VALUE port)
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{
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rb_io_t *fptr;
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struct udp_arg arg;
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VALUE ret;
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rb_secure(3);
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arg.res = rsock_addrinfo(host, port, SOCK_DGRAM, 0);
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GetOpenFile(sock, fptr);
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arg.fd = fptr->fd;
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ret = rb_ensure(udp_connect_internal, (VALUE)&arg,
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RUBY_METHOD_FUNC(freeaddrinfo), (VALUE)arg.res);
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if (!ret) rb_sys_fail("connect(2)");
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return INT2FIX(0);
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}
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/*
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* call-seq:
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* udpsocket.bind(host, port) #=> 0
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*
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* Binds _udpsocket_ to _host_:_port_.
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*
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* u1 = UDPSocket.new
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* u1.bind("127.0.0.1", 4913)
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* u1.send "message-to-self", 0, "127.0.0.1", 4913
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* p u1.recvfrom(10) #=> ["message-to", ["AF_INET", 4913, "localhost", "127.0.0.1"]]
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*
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*/
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static VALUE
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udp_bind(VALUE sock, VALUE host, VALUE port)
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{
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rb_io_t *fptr;
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struct addrinfo *res0, *res;
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rb_secure(3);
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res0 = rsock_addrinfo(host, port, SOCK_DGRAM, 0);
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GetOpenFile(sock, fptr);
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for (res = res0; res; res = res->ai_next) {
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if (bind(fptr->fd, res->ai_addr, res->ai_addrlen) < 0) {
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continue;
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}
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freeaddrinfo(res0);
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return INT2FIX(0);
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}
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freeaddrinfo(res0);
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rb_sys_fail("bind(2)");
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return INT2FIX(0);
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}
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/*
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* call-seq:
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* udpsocket.send(mesg, flags, host, port) => numbytes_sent
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* udpsocket.send(mesg, flags, sockaddr_to) => numbytes_sent
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* udpsocket.send(mesg, flags) => numbytes_sent
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*
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* Sends _mesg_ via _udpsocket_.
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*
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* _flags_ should be a bitwise OR of Socket::MSG_* constants.
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*
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* u1 = UDPSocket.new
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* u1.bind("127.0.0.1", 4913)
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*
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* u2 = UDPSocket.new
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* u2.send "hi", 0, "127.0.0.1", 4913
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*
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* mesg, addr = u1.recvfrom(10)
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* u1.send mesg, 0, addr[3], addr[1]
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*
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* p u2.recv(100) #=> "hi"
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*
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*/
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static VALUE
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udp_send(int argc, VALUE *argv, VALUE sock)
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{
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VALUE flags, host, port;
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rb_io_t *fptr;
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int n;
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struct addrinfo *res0, *res;
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struct rsock_send_arg arg;
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if (argc == 2 || argc == 3) {
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return rsock_bsock_send(argc, argv, sock);
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}
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rb_secure(4);
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rb_scan_args(argc, argv, "4", &arg.mesg, &flags, &host, &port);
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StringValue(arg.mesg);
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res0 = rsock_addrinfo(host, port, SOCK_DGRAM, 0);
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GetOpenFile(sock, fptr);
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arg.fd = fptr->fd;
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arg.flags = NUM2INT(flags);
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for (res = res0; res; res = res->ai_next) {
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retry:
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arg.to = res->ai_addr;
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arg.tolen = res->ai_addrlen;
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rb_thread_fd_writable(arg.fd);
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n = (int)BLOCKING_REGION(rsock_sendto_blocking, &arg);
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if (n >= 0) {
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freeaddrinfo(res0);
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return INT2FIX(n);
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}
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if (rb_io_wait_writable(fptr->fd)) {
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goto retry;
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}
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}
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freeaddrinfo(res0);
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rb_sys_fail("sendto(2)");
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return INT2FIX(n);
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}
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/*
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* call-seq:
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* udpsocket.recvfrom_nonblock(maxlen) => [mesg, sender_inet_addr]
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* udpsocket.recvfrom_nonblock(maxlen, flags) => [mesg, sender_inet_addr]
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*
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* Receives up to _maxlen_ bytes from +udpsocket+ using recvfrom(2) after
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* O_NONBLOCK is set for the underlying file descriptor.
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* If _maxlen_ is ommitted, its default value is 65536.
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* _flags_ is zero or more of the +MSG_+ options.
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* The first element of the results, _mesg_, is the data received.
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* The second element, _sender_inet_addr_, is an array to represent the sender address.
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*
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* When recvfrom(2) returns 0,
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* Socket#recvfrom_nonblock returns an empty string as data.
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* It means an empty packet.
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*
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* === Parameters
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* * +maxlen+ - the number of bytes to receive from the socket
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* * +flags+ - zero or more of the +MSG_+ options
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*
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* === Example
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* require 'socket'
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* s1 = UDPSocket.new
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* s1.bind("127.0.0.1", 0)
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* s2 = UDPSocket.new
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* s2.bind("127.0.0.1", 0)
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* s2.connect(*s1.addr.values_at(3,1))
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* s1.connect(*s2.addr.values_at(3,1))
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* s1.send "aaa", 0
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* begin # emulate blocking recvfrom
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* p s2.recvfrom_nonblock(10) #=> ["aaa", ["AF_INET", 33302, "localhost.localdomain", "127.0.0.1"]]
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* rescue IO::WaitReadable
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* IO.select([s2])
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* retry
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* end
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*
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* Refer to Socket#recvfrom for the exceptions that may be thrown if the call
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* to _recvfrom_nonblock_ fails.
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*
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* UDPSocket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure,
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* including Errno::EWOULDBLOCK.
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*
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* If the exception is Errno::EWOULDBLOCK or Errno::AGAIN,
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* it is extended by IO::WaitReadable.
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* So IO::WaitReadable can be used to rescue the exceptions for retrying recvfrom_nonblock.
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*
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* === See
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* * Socket#recvfrom
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*/
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static VALUE
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udp_recvfrom_nonblock(int argc, VALUE *argv, VALUE sock)
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{
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return rsock_s_recvfrom_nonblock(sock, argc, argv, RECV_IP);
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}
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/*
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* UDPSocket class
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*/
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void
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Init_udpsocket(void)
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{
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rb_cUDPSocket = rb_define_class("UDPSocket", rb_cIPSocket);
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rb_define_method(rb_cUDPSocket, "initialize", udp_init, -1);
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rb_define_method(rb_cUDPSocket, "connect", udp_connect, 2);
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rb_define_method(rb_cUDPSocket, "bind", udp_bind, 2);
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rb_define_method(rb_cUDPSocket, "send", udp_send, -1);
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rb_define_method(rb_cUDPSocket, "recvfrom_nonblock", udp_recvfrom_nonblock, -1);
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}
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