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