/************************************************ socket.c - created at: Thu Mar 31 12:21:29 JST 1994 Copyright (C) 1993-2007 Yukihiro Matsumoto ************************************************/ #include "rubysocket.h" static VALUE sock_s_unpack_sockaddr_in(VALUE, VALUE); void rsock_sys_fail_host_port(const char *mesg, VALUE host, VALUE port) { rsock_syserr_fail_host_port(errno, mesg, host, port); } void rsock_syserr_fail_host_port(int err, const char *mesg, VALUE host, VALUE port) { VALUE message; message = rb_sprintf("%s for %+"PRIsVALUE" port % "PRIsVALUE"", mesg, host, port); rb_syserr_fail_str(err, message); } void rsock_sys_fail_path(const char *mesg, VALUE path) { rsock_syserr_fail_path(errno, mesg, path); } void rsock_syserr_fail_path(int err, const char *mesg, VALUE path) { VALUE message; if (RB_TYPE_P(path, T_STRING)) { message = rb_sprintf("%s for % "PRIsVALUE"", mesg, path); rb_syserr_fail_str(err, message); } else { rb_syserr_fail(err, mesg); } } void rsock_sys_fail_sockaddr(const char *mesg, struct sockaddr *addr, socklen_t len) { rsock_syserr_fail_sockaddr(errno, mesg, addr, len); } void rsock_syserr_fail_sockaddr(int err, const char *mesg, struct sockaddr *addr, socklen_t len) { VALUE rai; rai = rsock_addrinfo_new(addr, len, PF_UNSPEC, 0, 0, Qnil, Qnil); rsock_syserr_fail_raddrinfo(err, mesg, rai); } void rsock_sys_fail_raddrinfo(const char *mesg, VALUE rai) { rsock_syserr_fail_raddrinfo(errno, mesg, rai); } void rsock_syserr_fail_raddrinfo(int err, const char *mesg, VALUE rai) { VALUE str, message; str = rsock_addrinfo_inspect_sockaddr(rai); message = rb_sprintf("%s for %"PRIsVALUE"", mesg, str); rb_syserr_fail_str(err, message); } void rsock_sys_fail_raddrinfo_or_sockaddr(const char *mesg, VALUE addr, VALUE rai) { rsock_syserr_fail_raddrinfo_or_sockaddr(errno, mesg, addr, rai); } void rsock_syserr_fail_raddrinfo_or_sockaddr(int err, const char *mesg, VALUE addr, VALUE rai) { if (NIL_P(rai)) { StringValue(addr); rsock_syserr_fail_sockaddr(err, mesg, (struct sockaddr *)RSTRING_PTR(addr), (socklen_t)RSTRING_LEN(addr)); /* overflow should be checked already */ } else rsock_syserr_fail_raddrinfo(err, mesg, rai); } static void setup_domain_and_type(VALUE domain, int *dv, VALUE type, int *tv) { *dv = rsock_family_arg(domain); *tv = rsock_socktype_arg(type); } /* * call-seq: * Socket.new(domain, socktype [, protocol]) => socket * * Creates a new socket object. * * _domain_ should be a communications domain such as: :INET, :INET6, :UNIX, etc. * * _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc. * * _protocol_ is optional and should be a protocol defined in the domain. * If protocol is not given, 0 is used internally. * * Socket.new(:INET, :STREAM) # TCP socket * Socket.new(:INET, :DGRAM) # UDP socket * Socket.new(:UNIX, :STREAM) # UNIX stream socket * Socket.new(:UNIX, :DGRAM) # UNIX datagram socket */ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); if (NIL_P(protocol)) protocol = INT2FIX(0); rb_secure(3); setup_domain_and_type(domain, &d, type, &t); fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } #if defined HAVE_SOCKETPAIR static VALUE io_call_close(VALUE io) { return rb_funcall(io, rb_intern("close"), 0, 0); } static VALUE io_close(VALUE io) { return rb_rescue(io_call_close, io, 0, 0); } static VALUE pair_yield(VALUE pair) { return rb_ensure(rb_yield, pair, io_close, rb_ary_entry(pair, 1)); } #endif #if defined HAVE_SOCKETPAIR #ifdef SOCK_CLOEXEC static int rsock_socketpair0(int domain, int type, int protocol, int sv[2]) { int ret; static int cloexec_state = -1; /* <0: unknown, 0: ignored, >0: working */ if (cloexec_state > 0) { /* common path, if SOCK_CLOEXEC is defined */ ret = socketpair(domain, type|SOCK_CLOEXEC, protocol, sv); if (ret == 0 && (sv[0] <= 2 || sv[1] <= 2)) { goto fix_cloexec; /* highly unlikely */ } goto update_max_fd; } else if (cloexec_state < 0) { /* usually runs once only for detection */ ret = socketpair(domain, type|SOCK_CLOEXEC, protocol, sv); if (ret == 0) { cloexec_state = rsock_detect_cloexec(sv[0]); if ((cloexec_state == 0) || (sv[0] <= 2 || sv[1] <= 2)) goto fix_cloexec; goto update_max_fd; } else if (ret == -1 && errno == EINVAL) { /* SOCK_CLOEXEC is available since Linux 2.6.27. Linux 2.6.18 fails with EINVAL */ ret = socketpair(domain, type, protocol, sv); if (ret != -1) { /* The reason of EINVAL may be other than SOCK_CLOEXEC. * So disable SOCK_CLOEXEC only if socketpair() succeeds without SOCK_CLOEXEC. * Ex. Socket.pair(:UNIX, 0xff) fails with EINVAL. */ cloexec_state = 0; } } } else { /* cloexec_state == 0 */ ret = socketpair(domain, type, protocol, sv); } if (ret == -1) { return -1; } fix_cloexec: rb_maygvl_fd_fix_cloexec(sv[0]); rb_maygvl_fd_fix_cloexec(sv[1]); update_max_fd: rb_update_max_fd(sv[0]); rb_update_max_fd(sv[1]); return ret; } #else /* !SOCK_CLOEXEC */ static int rsock_socketpair0(int domain, int type, int protocol, int sv[2]) { int ret = socketpair(domain, type, protocol, sv); if (ret == -1) return -1; rb_fd_fix_cloexec(sv[0]); rb_fd_fix_cloexec(sv[1]); return ret; } #endif /* !SOCK_CLOEXEC */ static int rsock_socketpair(int domain, int type, int protocol, int sv[2]) { int ret; ret = rsock_socketpair0(domain, type, protocol, sv); if (ret < 0 && (errno == EMFILE || errno == ENFILE)) { rb_gc(); ret = rsock_socketpair0(domain, type, protocol, sv); } return ret; } /* * call-seq: * Socket.pair(domain, type, protocol) => [socket1, socket2] * Socket.socketpair(domain, type, protocol) => [socket1, socket2] * * Creates a pair of sockets connected each other. * * _domain_ should be a communications domain such as: :INET, :INET6, :UNIX, etc. * * _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc. * * _protocol_ should be a protocol defined in the domain, * defaults to 0 for the domain. * * s1, s2 = Socket.pair(:UNIX, :STREAM, 0) * s1.send "a", 0 * s1.send "b", 0 * s1.close * p s2.recv(10) #=> "ab" * p s2.recv(10) #=> "" * p s2.recv(10) #=> "" * * s1, s2 = Socket.pair(:UNIX, :DGRAM, 0) * s1.send "a", 0 * s1.send "b", 0 * p s2.recv(10) #=> "a" * p s2.recv(10) #=> "b" * */ VALUE rsock_sock_s_socketpair(int argc, VALUE *argv, VALUE klass) { VALUE domain, type, protocol; int d, t, p, sp[2]; int ret; VALUE s1, s2, r; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); if (NIL_P(protocol)) protocol = INT2FIX(0); setup_domain_and_type(domain, &d, type, &t); p = NUM2INT(protocol); ret = rsock_socketpair(d, t, p, sp); if (ret < 0) { rb_sys_fail("socketpair(2)"); } s1 = rsock_init_sock(rb_obj_alloc(klass), sp[0]); s2 = rsock_init_sock(rb_obj_alloc(klass), sp[1]); r = rb_assoc_new(s1, s2); if (rb_block_given_p()) { return rb_ensure(pair_yield, r, io_close, s1); } return r; } #else #define rsock_sock_s_socketpair rb_f_notimplement #endif /* * call-seq: * socket.connect(remote_sockaddr) => 0 * * Requests a connection to be made on the given +remote_sockaddr+. Returns 0 if * successful, otherwise an exception is raised. * * === Parameter * * +remote_sockaddr+ - the +struct+ sockaddr contained in a string or Addrinfo object * * === Example: * # Pull down Google's web page * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 80, 'www.google.com' ) * socket.connect( sockaddr ) * socket.write( "GET / HTTP/1.0\r\n\r\n" ) * results = socket.read * * === Unix-based Exceptions * On unix-based systems the following system exceptions may be raised if * the call to _connect_ fails: * * Errno::EACCES - search permission is denied for a component of the prefix * path or write access to the +socket+ is denied * * Errno::EADDRINUSE - the _sockaddr_ is already in use * * Errno::EADDRNOTAVAIL - the specified _sockaddr_ is not available from the * local machine * * Errno::EAFNOSUPPORT - the specified _sockaddr_ is not a valid address for * the address family of the specified +socket+ * * Errno::EALREADY - a connection is already in progress for the specified * socket * * Errno::EBADF - the +socket+ is not a valid file descriptor * * Errno::ECONNREFUSED - the target _sockaddr_ was not listening for connections * refused the connection request * * Errno::ECONNRESET - the remote host reset the connection request * * Errno::EFAULT - the _sockaddr_ cannot be accessed * * Errno::EHOSTUNREACH - the destination host cannot be reached (probably * because the host is down or a remote router cannot reach it) * * Errno::EINPROGRESS - the O_NONBLOCK is set for the +socket+ and the * connection cannot be immediately established; the connection will be * established asynchronously * * Errno::EINTR - the attempt to establish the connection was interrupted by * delivery of a signal that was caught; the connection will be established * asynchronously * * Errno::EISCONN - the specified +socket+ is already connected * * Errno::EINVAL - the address length used for the _sockaddr_ is not a valid * length for the address family or there is an invalid family in _sockaddr_ * * Errno::ENAMETOOLONG - the pathname resolved had a length which exceeded * PATH_MAX * * Errno::ENETDOWN - the local interface used to reach the destination is down * * Errno::ENETUNREACH - no route to the network is present * * Errno::ENOBUFS - no buffer space is available * * Errno::ENOSR - there were insufficient STREAMS resources available to * complete the operation * * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket * * Errno::EOPNOTSUPP - the calling +socket+ is listening and cannot be connected * * Errno::EPROTOTYPE - the _sockaddr_ has a different type than the socket * bound to the specified peer address * * Errno::ETIMEDOUT - the attempt to connect time out before a connection * was made. * * On unix-based systems if the address family of the calling +socket+ is * AF_UNIX the follow exceptions may be raised if the call to _connect_ * fails: * * Errno::EIO - an i/o error occurred while reading from or writing to the * file system * * Errno::ELOOP - too many symbolic links were encountered in translating * the pathname in _sockaddr_ * * Errno::ENAMETOOLLONG - a component of a pathname exceeded NAME_MAX * characters, or an entire pathname exceeded PATH_MAX characters * * Errno::ENOENT - a component of the pathname does not name an existing file * or the pathname is an empty string * * Errno::ENOTDIR - a component of the path prefix of the pathname in _sockaddr_ * is not a directory * * === Windows Exceptions * On Windows systems the following system exceptions may be raised if * the call to _connect_ fails: * * Errno::ENETDOWN - the network is down * * Errno::EADDRINUSE - the socket's local address is already in use * * Errno::EINTR - the socket was cancelled * * Errno::EINPROGRESS - a blocking socket is in progress or the service provider * is still processing a callback function. Or a nonblocking connect call is * in progress on the +socket+. * * Errno::EALREADY - see Errno::EINVAL * * Errno::EADDRNOTAVAIL - the remote address is not a valid address, such as * ADDR_ANY TODO check ADDRANY TO INADDR_ANY * * Errno::EAFNOSUPPORT - addresses in the specified family cannot be used with * with this +socket+ * * Errno::ECONNREFUSED - the target _sockaddr_ was not listening for connections * refused the connection request * * Errno::EFAULT - the socket's internal address or address length parameter * is too small or is not a valid part of the user space address * * Errno::EINVAL - the +socket+ is a listening socket * * Errno::EISCONN - the +socket+ is already connected * * Errno::ENETUNREACH - the network cannot be reached from this host at this time * * Errno::EHOSTUNREACH - no route to the network is present * * Errno::ENOBUFS - no buffer space is available * * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket * * Errno::ETIMEDOUT - the attempt to connect time out before a connection * was made. * * Errno::EWOULDBLOCK - the socket is marked as nonblocking and the * connection cannot be completed immediately * * Errno::EACCES - the attempt to connect the datagram socket to the * broadcast address failed * * === See * * connect manual pages on unix-based systems * * connect function in Microsoft's Winsock functions reference */ static VALUE sock_connect(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; int fd, n; SockAddrStringValueWithAddrinfo(addr, rai); addr = rb_str_new4(addr); GetOpenFile(sock, fptr); fd = fptr->fd; n = rsock_connect(fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0); if (n < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("connect(2)", addr, rai); } return INT2FIX(n); } /* * call-seq: * socket.connect_nonblock(remote_sockaddr) => 0 * * Requests a connection to be made on the given +remote_sockaddr+ after * O_NONBLOCK is set for the underlying file descriptor. * Returns 0 if successful, otherwise an exception is raised. * * === Parameter * * +remote_sockaddr+ - the +struct+ sockaddr contained in a string or Addrinfo object * * === Example: * # Pull down Google's web page * require 'socket' * include Socket::Constants * socket = Socket.new(AF_INET, SOCK_STREAM, 0) * sockaddr = Socket.sockaddr_in(80, 'www.google.com') * begin # emulate blocking connect * socket.connect_nonblock(sockaddr) * rescue IO::WaitWritable * IO.select(nil, [socket]) # wait 3-way handshake completion * begin * socket.connect_nonblock(sockaddr) # check connection failure * rescue Errno::EISCONN * end * end * socket.write("GET / HTTP/1.0\r\n\r\n") * results = socket.read * * Refer to Socket#connect for the exceptions that may be thrown if the call * to _connect_nonblock_ fails. * * Socket#connect_nonblock may raise any error corresponding to connect(2) failure, * including Errno::EINPROGRESS. * * If the exception is Errno::EINPROGRESS, * it is extended by IO::WaitWritable. * So IO::WaitWritable can be used to rescue the exceptions for retrying connect_nonblock. * * === See * * Socket#connect */ static VALUE sock_connect_nonblock(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; int n; SockAddrStringValueWithAddrinfo(addr, rai); addr = rb_str_new4(addr); GetOpenFile(sock, fptr); rb_io_set_nonblock(fptr); n = connect(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)); if (n < 0) { if (errno == EINPROGRESS) rb_readwrite_sys_fail(RB_IO_WAIT_WRITABLE, "connect(2) would block"); rsock_sys_fail_raddrinfo_or_sockaddr("connect(2)", addr, rai); } return INT2FIX(n); } /* * call-seq: * socket.bind(local_sockaddr) => 0 * * Binds to the given local address. * * === Parameter * * +local_sockaddr+ - the +struct+ sockaddr contained in a string or an Addrinfo object * * === Example * require 'socket' * * # use Addrinfo * socket = Socket.new(:INET, :STREAM, 0) * socket.bind(Addrinfo.tcp("127.0.0.1", 2222)) * p socket.local_address #=> # * * # use struct sockaddr * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.bind( sockaddr ) * * === Unix-based Exceptions * On unix-based based systems the following system exceptions may be raised if * the call to _bind_ fails: * * Errno::EACCES - the specified _sockaddr_ is protected and the current * user does not have permission to bind to it * * Errno::EADDRINUSE - the specified _sockaddr_ is already in use * * Errno::EADDRNOTAVAIL - the specified _sockaddr_ is not available from the * local machine * * Errno::EAFNOSUPPORT - the specified _sockaddr_ is not a valid address for * the family of the calling +socket+ * * Errno::EBADF - the _sockaddr_ specified is not a valid file descriptor * * Errno::EFAULT - the _sockaddr_ argument cannot be accessed * * Errno::EINVAL - the +socket+ is already bound to an address, and the * protocol does not support binding to the new _sockaddr_ or the +socket+ * has been shut down. * * Errno::EINVAL - the address length is not a valid length for the address * family * * Errno::ENAMETOOLONG - the pathname resolved had a length which exceeded * PATH_MAX * * Errno::ENOBUFS - no buffer space is available * * Errno::ENOSR - there were insufficient STREAMS resources available to * complete the operation * * Errno::ENOTSOCK - the +socket+ does not refer to a socket * * Errno::EOPNOTSUPP - the socket type of the +socket+ does not support * binding to an address * * On unix-based based systems if the address family of the calling +socket+ is * Socket::AF_UNIX the follow exceptions may be raised if the call to _bind_ * fails: * * Errno::EACCES - search permission is denied for a component of the prefix * path or write access to the +socket+ is denied * * Errno::EDESTADDRREQ - the _sockaddr_ argument is a null pointer * * Errno::EISDIR - same as Errno::EDESTADDRREQ * * Errno::EIO - an i/o error occurred * * Errno::ELOOP - too many symbolic links were encountered in translating * the pathname in _sockaddr_ * * Errno::ENAMETOOLLONG - a component of a pathname exceeded NAME_MAX * characters, or an entire pathname exceeded PATH_MAX characters * * Errno::ENOENT - a component of the pathname does not name an existing file * or the pathname is an empty string * * Errno::ENOTDIR - a component of the path prefix of the pathname in _sockaddr_ * is not a directory * * Errno::EROFS - the name would reside on a read only filesystem * * === Windows Exceptions * On Windows systems the following system exceptions may be raised if * the call to _bind_ fails: * * Errno::ENETDOWN-- the network is down * * Errno::EACCES - the attempt to connect the datagram socket to the * broadcast address failed * * Errno::EADDRINUSE - the socket's local address is already in use * * Errno::EADDRNOTAVAIL - the specified address is not a valid address for this * computer * * Errno::EFAULT - the socket's internal address or address length parameter * is too small or is not a valid part of the user space addressed * * Errno::EINVAL - the +socket+ is already bound to an address * * Errno::ENOBUFS - no buffer space is available * * Errno::ENOTSOCK - the +socket+ argument does not refer to a socket * * === See * * bind manual pages on unix-based systems * * bind function in Microsoft's Winsock functions reference */ static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); return INT2FIX(0); } /* * call-seq: * socket.listen( int ) => 0 * * Listens for connections, using the specified +int+ as the backlog. A call * to _listen_ only applies if the +socket+ is of type SOCK_STREAM or * SOCK_SEQPACKET. * * === Parameter * * +backlog+ - the maximum length of the queue for pending connections. * * === Example 1 * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.bind( sockaddr ) * socket.listen( 5 ) * * === Example 2 (listening on an arbitrary port, unix-based systems only): * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * socket.listen( 1 ) * * === Unix-based Exceptions * On unix based systems the above will work because a new +sockaddr+ struct * is created on the address ADDR_ANY, for an arbitrary port number as handed * off by the kernel. It will not work on Windows, because Windows requires that * the +socket+ is bound by calling _bind_ before it can _listen_. * * If the _backlog_ amount exceeds the implementation-dependent maximum * queue length, the implementation's maximum queue length will be used. * * On unix-based based systems the following system exceptions may be raised if the * call to _listen_ fails: * * Errno::EBADF - the _socket_ argument is not a valid file descriptor * * Errno::EDESTADDRREQ - the _socket_ is not bound to a local address, and * the protocol does not support listening on an unbound socket * * Errno::EINVAL - the _socket_ is already connected * * Errno::ENOTSOCK - the _socket_ argument does not refer to a socket * * Errno::EOPNOTSUPP - the _socket_ protocol does not support listen * * Errno::EACCES - the calling process does not have appropriate privileges * * Errno::EINVAL - the _socket_ has been shut down * * Errno::ENOBUFS - insufficient resources are available in the system to * complete the call * * === Windows Exceptions * On Windows systems the following system exceptions may be raised if * the call to _listen_ fails: * * Errno::ENETDOWN - the network is down * * Errno::EADDRINUSE - the socket's local address is already in use. This * usually occurs during the execution of _bind_ but could be delayed * if the call to _bind_ was to a partially wildcard address (involving * ADDR_ANY) and if a specific address needs to be committed at the * time of the call to _listen_ * * Errno::EINPROGRESS - a Windows Sockets 1.1 call is in progress or the * service provider is still processing a callback function * * Errno::EINVAL - the +socket+ has not been bound with a call to _bind_. * * Errno::EISCONN - the +socket+ is already connected * * Errno::EMFILE - no more socket descriptors are available * * Errno::ENOBUFS - no buffer space is available * * Errno::ENOTSOC - +socket+ is not a socket * * Errno::EOPNOTSUPP - the referenced +socket+ is not a type that supports * the _listen_ method * * === See * * listen manual pages on unix-based systems * * listen function in Microsoft's Winsock functions reference */ VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } /* * call-seq: * socket.recvfrom(maxlen) => [mesg, sender_addrinfo] * socket.recvfrom(maxlen, flags) => [mesg, sender_addrinfo] * * Receives up to _maxlen_ bytes from +socket+. _flags_ is zero or more * of the +MSG_+ options. The first element of the results, _mesg_, is the data * received. The second element, _sender_addrinfo_, contains protocol-specific * address information of the sender. * * === Parameters * * +maxlen+ - the maximum number of bytes to receive from the socket * * +flags+ - zero or more of the +MSG_+ options * * === Example * # In one file, start this first * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.bind( sockaddr ) * socket.listen( 5 ) * client, client_addrinfo = socket.accept * data = client.recvfrom( 20 )[0].chomp * puts "I only received 20 bytes '#{data}'" * sleep 1 * socket.close * * # In another file, start this second * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.connect( sockaddr ) * socket.puts "Watch this get cut short!" * socket.close * * === Unix-based Exceptions * On unix-based based systems the following system exceptions may be raised if the * call to _recvfrom_ fails: * * Errno::EAGAIN - the +socket+ file descriptor is marked as O_NONBLOCK and no * data is waiting to be received; or MSG_OOB is set and no out-of-band data * is available and either the +socket+ file descriptor is marked as * O_NONBLOCK or the +socket+ does not support blocking to wait for * out-of-band-data * * Errno::EWOULDBLOCK - see Errno::EAGAIN * * Errno::EBADF - the +socket+ is not a valid file descriptor * * Errno::ECONNRESET - a connection was forcibly closed by a peer * * Errno::EFAULT - the socket's internal buffer, address or address length * cannot be accessed or written * * Errno::EINTR - a signal interrupted _recvfrom_ before any data was available * * Errno::EINVAL - the MSG_OOB flag is set and no out-of-band data is available * * Errno::EIO - an i/o error occurred while reading from or writing to the * filesystem * * Errno::ENOBUFS - insufficient resources were available in the system to * perform the operation * * Errno::ENOMEM - insufficient memory was available to fulfill the request * * Errno::ENOSR - there were insufficient STREAMS resources available to * complete the operation * * Errno::ENOTCONN - a receive is attempted on a connection-mode socket that * is not connected * * Errno::ENOTSOCK - the +socket+ does not refer to a socket * * Errno::EOPNOTSUPP - the specified flags are not supported for this socket type * * Errno::ETIMEDOUT - the connection timed out during connection establishment * or due to a transmission timeout on an active connection * * === Windows Exceptions * On Windows systems the following system exceptions may be raised if * the call to _recvfrom_ fails: * * Errno::ENETDOWN - the network is down * * Errno::EFAULT - the internal buffer and from parameters on +socket+ are not * part of the user address space, or the internal fromlen parameter is * too small to accommodate the peer address * * Errno::EINTR - the (blocking) call was cancelled by an internal call to * the WinSock function WSACancelBlockingCall * * Errno::EINPROGRESS - a blocking Windows Sockets 1.1 call is in progress or * the service provider is still processing a callback function * * Errno::EINVAL - +socket+ has not been bound with a call to _bind_, or an * unknown flag was specified, or MSG_OOB was specified for a socket with * SO_OOBINLINE enabled, or (for byte stream-style sockets only) the internal * len parameter on +socket+ was zero or negative * * Errno::EISCONN - +socket+ is already connected. The call to _recvfrom_ is * not permitted with a connected socket on a socket that is connection * oriented or connectionless. * * Errno::ENETRESET - the connection has been broken due to the keep-alive * activity detecting a failure while the operation was in progress. * * Errno::EOPNOTSUPP - MSG_OOB was specified, but +socket+ is not stream-style * such as type SOCK_STREAM. OOB data is not supported in the communication * domain associated with +socket+, or +socket+ is unidirectional and * supports only send operations * * Errno::ESHUTDOWN - +socket+ has been shutdown. It is not possible to * call _recvfrom_ on a socket after _shutdown_ has been invoked. * * Errno::EWOULDBLOCK - +socket+ is marked as nonblocking and a call to * _recvfrom_ would block. * * Errno::EMSGSIZE - the message was too large to fit into the specified buffer * and was truncated. * * Errno::ETIMEDOUT - the connection has been dropped, because of a network * failure or because the system on the other end went down without * notice * * Errno::ECONNRESET - the virtual circuit was reset by the remote side * executing a hard or abortive close. The application should close the * socket; it is no longer usable. On a UDP-datagram socket this error * indicates a previous send operation resulted in an ICMP Port Unreachable * message. */ static VALUE sock_recvfrom(int argc, VALUE *argv, VALUE sock) { return rsock_s_recvfrom(sock, argc, argv, RECV_SOCKET); } /* * call-seq: * socket.recvfrom_nonblock(maxlen) => [mesg, sender_addrinfo] * socket.recvfrom_nonblock(maxlen, flags) => [mesg, sender_addrinfo] * * Receives up to _maxlen_ bytes from +socket+ using recvfrom(2) after * O_NONBLOCK is set for the underlying file descriptor. * _flags_ is zero or more of the +MSG_+ options. * The first element of the results, _mesg_, is the data received. * The second element, _sender_addrinfo_, contains protocol-specific address * information of the sender. * * When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns * an empty string as data. * The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc. * * === Parameters * * +maxlen+ - the maximum number of bytes to receive from the socket * * +flags+ - zero or more of the +MSG_+ options * * === Example * # In one file, start this first * require 'socket' * include Socket::Constants * socket = Socket.new(AF_INET, SOCK_STREAM, 0) * sockaddr = Socket.sockaddr_in(2200, 'localhost') * socket.bind(sockaddr) * socket.listen(5) * client, client_addrinfo = socket.accept * begin # emulate blocking recvfrom * pair = client.recvfrom_nonblock(20) * rescue IO::WaitReadable * IO.select([client]) * retry * end * data = pair[0].chomp * puts "I only received 20 bytes '#{data}'" * sleep 1 * socket.close * * # In another file, start this second * require 'socket' * include Socket::Constants * socket = Socket.new(AF_INET, SOCK_STREAM, 0) * sockaddr = Socket.sockaddr_in(2200, 'localhost') * socket.connect(sockaddr) * socket.puts "Watch this get cut short!" * socket.close * * Refer to Socket#recvfrom for the exceptions that may be thrown if the call * to _recvfrom_nonblock_ fails. * * Socket#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 sock_recvfrom_nonblock(int argc, VALUE *argv, VALUE sock) { return rsock_s_recvfrom_nonblock(sock, argc, argv, RECV_SOCKET); } /* * call-seq: * socket.accept => [client_socket, client_addrinfo] * * Accepts a next connection. * Returns a new Socket object and Addrinfo object. * * serv = Socket.new(:INET, :STREAM, 0) * serv.listen(5) * c = Socket.new(:INET, :STREAM, 0) * c.connect(serv.connect_address) * p serv.accept #=> [#, #] * */ static VALUE sock_accept(VALUE sock) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept(rb_cSocket,fptr->fd,&buf.addr,&len); return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } /* * call-seq: * socket.accept_nonblock => [client_socket, client_addrinfo] * * Accepts an incoming connection using accept(2) after * O_NONBLOCK is set for the underlying file descriptor. * It returns an array containing the accepted socket * for the incoming connection, _client_socket_, * and an Addrinfo, _client_addrinfo_. * * === Example * # In one script, start this first * require 'socket' * include Socket::Constants * socket = Socket.new(AF_INET, SOCK_STREAM, 0) * sockaddr = Socket.sockaddr_in(2200, 'localhost') * socket.bind(sockaddr) * socket.listen(5) * begin # emulate blocking accept * client_socket, client_addrinfo = socket.accept_nonblock * rescue IO::WaitReadable, Errno::EINTR * IO.select([socket]) * retry * end * puts "The client said, '#{client_socket.readline.chomp}'" * client_socket.puts "Hello from script one!" * socket.close * * # In another script, start this second * require 'socket' * include Socket::Constants * socket = Socket.new(AF_INET, SOCK_STREAM, 0) * sockaddr = Socket.sockaddr_in(2200, 'localhost') * socket.connect(sockaddr) * socket.puts "Hello from script 2." * puts "The server said, '#{socket.readline.chomp}'" * socket.close * * Refer to Socket#accept for the exceptions that may be thrown if the call * to _accept_nonblock_ fails. * * Socket#accept_nonblock may raise any error corresponding to accept(2) failure, * including Errno::EWOULDBLOCK. * * If the exception is Errno::EWOULDBLOCK, Errno::AGAIN, Errno::ECONNABORTED or Errno::EPROTO, * it is extended by IO::WaitReadable. * So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock. * * === See * * Socket#accept */ static VALUE sock_accept_nonblock(VALUE sock) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, fptr, &buf.addr, &len); return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } /* * call-seq: * socket.sysaccept => [client_socket_fd, client_addrinfo] * * Accepts an incoming connection returning an array containing the (integer) * file descriptor for the incoming connection, _client_socket_fd_, * and an Addrinfo, _client_addrinfo_. * * === Example * # In one script, start this first * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.bind( sockaddr ) * socket.listen( 5 ) * client_fd, client_addrinfo = socket.sysaccept * client_socket = Socket.for_fd( client_fd ) * puts "The client said, '#{client_socket.readline.chomp}'" * client_socket.puts "Hello from script one!" * socket.close * * # In another script, start this second * require 'socket' * include Socket::Constants * socket = Socket.new( AF_INET, SOCK_STREAM, 0 ) * sockaddr = Socket.pack_sockaddr_in( 2200, 'localhost' ) * socket.connect( sockaddr ) * socket.puts "Hello from script 2." * puts "The server said, '#{socket.readline.chomp}'" * socket.close * * Refer to Socket#accept for the exceptions that may be thrown if the call * to _sysaccept_ fails. * * === See * * Socket#accept */ static VALUE sock_sysaccept(VALUE sock) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept(0,fptr->fd,&buf.addr,&len); return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } #ifdef HAVE_GETHOSTNAME /* * call-seq: * Socket.gethostname => hostname * * Returns the hostname. * * p Socket.gethostname #=> "hal" * * Note that it is not guaranteed to be able to convert to IP address using gethostbyname, getaddrinfo, etc. * If you need local IP address, use Socket.ip_address_list. */ static VALUE sock_gethostname(VALUE obj) { #if defined(NI_MAXHOST) # define RUBY_MAX_HOST_NAME_LEN NI_MAXHOST #elif defined(HOST_NAME_MAX) # define RUBY_MAX_HOST_NAME_LEN HOST_NAME_MAX #else # define RUBY_MAX_HOST_NAME_LEN 1024 #endif char buf[RUBY_MAX_HOST_NAME_LEN+1]; rb_secure(3); if (gethostname(buf, (int)sizeof buf - 1) < 0) rb_sys_fail("gethostname(3)"); buf[sizeof buf - 1] = '\0'; return rb_str_new2(buf); } #else #ifdef HAVE_UNAME #include static VALUE sock_gethostname(VALUE obj) { struct utsname un; rb_secure(3); uname(&un); return rb_str_new2(un.nodename); } #else #define sock_gethostname rb_f_notimplement #endif #endif static VALUE make_addrinfo(struct rb_addrinfo *res0, int norevlookup) { VALUE base, ary; struct addrinfo *res; if (res0 == NULL) { rb_raise(rb_eSocket, "host not found"); } base = rb_ary_new(); for (res = res0->ai; res; res = res->ai_next) { ary = rsock_ipaddr(res->ai_addr, res->ai_addrlen, norevlookup); if (res->ai_canonname) { RARRAY_PTR(ary)[2] = rb_str_new2(res->ai_canonname); } rb_ary_push(ary, INT2FIX(res->ai_family)); rb_ary_push(ary, INT2FIX(res->ai_socktype)); rb_ary_push(ary, INT2FIX(res->ai_protocol)); rb_ary_push(base, ary); } return base; } static VALUE sock_sockaddr(struct sockaddr *addr, socklen_t len) { char *ptr; switch (addr->sa_family) { case AF_INET: ptr = (char*)&((struct sockaddr_in*)addr)->sin_addr.s_addr; len = (socklen_t)sizeof(((struct sockaddr_in*)addr)->sin_addr.s_addr); break; #ifdef AF_INET6 case AF_INET6: ptr = (char*)&((struct sockaddr_in6*)addr)->sin6_addr.s6_addr; len = (socklen_t)sizeof(((struct sockaddr_in6*)addr)->sin6_addr.s6_addr); break; #endif default: rb_raise(rb_eSocket, "unknown socket family:%d", addr->sa_family); break; } return rb_str_new(ptr, len); } /* * call-seq: * Socket.gethostbyname(hostname) => [official_hostname, alias_hostnames, address_family, *address_list] * * Obtains the host information for _hostname_. * * p Socket.gethostbyname("hal") #=> ["localhost", ["hal"], 2, "\x7F\x00\x00\x01"] * */ static VALUE sock_s_gethostbyname(VALUE obj, VALUE host) { rb_secure(3); return rsock_make_hostent(host, rsock_addrinfo(host, Qnil, SOCK_STREAM, AI_CANONNAME), sock_sockaddr); } /* * call-seq: * Socket.gethostbyaddr(address_string [, address_family]) => hostent * * Obtains the host information for _address_. * * p Socket.gethostbyaddr([221,186,184,68].pack("CCCC")) * #=> ["carbon.ruby-lang.org", [], 2, "\xDD\xBA\xB8D"] */ static VALUE sock_s_gethostbyaddr(int argc, VALUE *argv) { VALUE addr, family; struct hostent *h; char **pch; VALUE ary, names; int t = AF_INET; rb_scan_args(argc, argv, "11", &addr, &family); StringValue(addr); if (!NIL_P(family)) { t = rsock_family_arg(family); } #ifdef AF_INET6 else if (RSTRING_LEN(addr) == 16) { t = AF_INET6; } #endif h = gethostbyaddr(RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), t); if (h == NULL) { #ifdef HAVE_HSTRERROR extern int h_errno; rb_raise(rb_eSocket, "%s", (char*)hstrerror(h_errno)); #else rb_raise(rb_eSocket, "host not found"); #endif } ary = rb_ary_new(); rb_ary_push(ary, rb_str_new2(h->h_name)); names = rb_ary_new(); rb_ary_push(ary, names); if (h->h_aliases != NULL) { for (pch = h->h_aliases; *pch; pch++) { rb_ary_push(names, rb_str_new2(*pch)); } } rb_ary_push(ary, INT2NUM(h->h_addrtype)); #ifdef h_addr for (pch = h->h_addr_list; *pch; pch++) { rb_ary_push(ary, rb_str_new(*pch, h->h_length)); } #else rb_ary_push(ary, rb_str_new(h->h_addr, h->h_length)); #endif return ary; } /* * call-seq: * Socket.getservbyname(service_name) => port_number * Socket.getservbyname(service_name, protocol_name) => port_number * * Obtains the port number for _service_name_. * * If _protocol_name_ is not given, "tcp" is assumed. * * Socket.getservbyname("smtp") #=> 25 * Socket.getservbyname("shell") #=> 514 * Socket.getservbyname("syslog", "udp") #=> 514 */ static VALUE sock_s_getservbyname(int argc, VALUE *argv) { VALUE service, proto; struct servent *sp; long port; const char *servicename, *protoname = "tcp"; rb_scan_args(argc, argv, "11", &service, &proto); StringValue(service); if (!NIL_P(proto)) StringValue(proto); servicename = StringValueCStr(service); if (!NIL_P(proto)) protoname = StringValueCStr(proto); sp = getservbyname(servicename, protoname); if (sp) { port = ntohs(sp->s_port); } else { char *end; port = STRTOUL(servicename, &end, 0); if (*end != '\0') { rb_raise(rb_eSocket, "no such service %s/%s", servicename, protoname); } } return INT2FIX(port); } /* * call-seq: * Socket.getservbyport(port [, protocol_name]) => service * * Obtains the port number for _port_. * * If _protocol_name_ is not given, "tcp" is assumed. * * Socket.getservbyport(80) #=> "www" * Socket.getservbyport(514, "tcp") #=> "shell" * Socket.getservbyport(514, "udp") #=> "syslog" * */ static VALUE sock_s_getservbyport(int argc, VALUE *argv) { VALUE port, proto; struct servent *sp; long portnum; const char *protoname = "tcp"; rb_scan_args(argc, argv, "11", &port, &proto); portnum = NUM2LONG(port); if (portnum != (uint16_t)portnum) { const char *s = portnum > 0 ? "big" : "small"; rb_raise(rb_eRangeError, "integer %ld too %s to convert into `int16_t'", portnum, s); } if (!NIL_P(proto)) protoname = StringValueCStr(proto); sp = getservbyport((int)htons((uint16_t)portnum), protoname); if (!sp) { rb_raise(rb_eSocket, "no such service for port %d/%s", (int)portnum, protoname); } return rb_tainted_str_new2(sp->s_name); } /* * call-seq: * Socket.getaddrinfo(nodename, servname[, family[, socktype[, protocol[, flags[, reverse_lookup]]]]]) => array * * Obtains address information for _nodename_:_servname_. * * _family_ should be an address family such as: :INET, :INET6, :UNIX, etc. * * _socktype_ should be a socket type such as: :STREAM, :DGRAM, :RAW, etc. * * _protocol_ should be a protocol defined in the family, * and defaults to 0 for the family. * * _flags_ should be bitwise OR of Socket::AI_* constants. * * Socket.getaddrinfo("www.ruby-lang.org", "http", nil, :STREAM) * #=> [["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68", 2, 1, 6]] # PF_INET/SOCK_STREAM/IPPROTO_TCP * * Socket.getaddrinfo("localhost", nil) * #=> [["AF_INET", 0, "localhost", "127.0.0.1", 2, 1, 6], # PF_INET/SOCK_STREAM/IPPROTO_TCP * # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 2, 17], # PF_INET/SOCK_DGRAM/IPPROTO_UDP * # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 3, 0]] # PF_INET/SOCK_RAW/IPPROTO_IP * * _reverse_lookup_ directs the form of the third element, and has to * be one of below. If _reverse_lookup_ is omitted, the default value is +nil+. * * +true+, +:hostname+: hostname is obtained from numeric address using reverse lookup, which may take a time. * +false+, +:numeric+: hostname is same as numeric address. * +nil+: obey to the current +do_not_reverse_lookup+ flag. * * If Addrinfo object is preferred, use Addrinfo.getaddrinfo. */ static VALUE sock_s_getaddrinfo(int argc, VALUE *argv) { VALUE host, port, family, socktype, protocol, flags, ret, revlookup; struct addrinfo hints; struct rb_addrinfo *res; int norevlookup; rb_scan_args(argc, argv, "25", &host, &port, &family, &socktype, &protocol, &flags, &revlookup); MEMZERO(&hints, struct addrinfo, 1); hints.ai_family = NIL_P(family) ? PF_UNSPEC : rsock_family_arg(family); if (!NIL_P(socktype)) { hints.ai_socktype = rsock_socktype_arg(socktype); } if (!NIL_P(protocol)) { hints.ai_protocol = NUM2INT(protocol); } if (!NIL_P(flags)) { hints.ai_flags = NUM2INT(flags); } if (NIL_P(revlookup) || !rsock_revlookup_flag(revlookup, &norevlookup)) { norevlookup = rsock_do_not_reverse_lookup; } res = rsock_getaddrinfo(host, port, &hints, 0); ret = make_addrinfo(res, norevlookup); rb_freeaddrinfo(res); return ret; } /* * call-seq: * Socket.getnameinfo(sockaddr [, flags]) => [hostname, servicename] * * Obtains name information for _sockaddr_. * * _sockaddr_ should be one of follows. * - packed sockaddr string such as Socket.sockaddr_in(80, "127.0.0.1") * - 3-elements array such as ["AF_INET", 80, "127.0.0.1"] * - 4-elements array such as ["AF_INET", 80, ignored, "127.0.0.1"] * * _flags_ should be bitwise OR of Socket::NI_* constants. * * Note: * The last form is compatible with IPSocket#addr and IPSocket#peeraddr. * * Socket.getnameinfo(Socket.sockaddr_in(80, "127.0.0.1")) #=> ["localhost", "www"] * Socket.getnameinfo(["AF_INET", 80, "127.0.0.1"]) #=> ["localhost", "www"] * Socket.getnameinfo(["AF_INET", 80, "localhost", "127.0.0.1"]) #=> ["localhost", "www"] * * If Addrinfo object is preferred, use Addrinfo#getnameinfo. */ static VALUE sock_s_getnameinfo(int argc, VALUE *argv) { VALUE sa, af = Qnil, host = Qnil, port = Qnil, flags, tmp; char *hptr, *pptr; char hbuf[1024], pbuf[1024]; int fl; struct rb_addrinfo *res = NULL; struct addrinfo hints, *r; int error, saved_errno; union_sockaddr ss; struct sockaddr *sap; socklen_t salen; sa = flags = Qnil; rb_scan_args(argc, argv, "11", &sa, &flags); fl = 0; if (!NIL_P(flags)) { fl = NUM2INT(flags); } tmp = rb_check_sockaddr_string_type(sa); if (!NIL_P(tmp)) { sa = tmp; if (sizeof(ss) < (size_t)RSTRING_LEN(sa)) { rb_raise(rb_eTypeError, "sockaddr length too big"); } memcpy(&ss, RSTRING_PTR(sa), RSTRING_LEN(sa)); if (!VALIDATE_SOCKLEN(&ss.addr, RSTRING_LEN(sa))) { rb_raise(rb_eTypeError, "sockaddr size differs - should not happen"); } sap = &ss.addr; salen = RSTRING_SOCKLEN(sa); goto call_nameinfo; } tmp = rb_check_array_type(sa); if (!NIL_P(tmp)) { sa = tmp; MEMZERO(&hints, struct addrinfo, 1); if (RARRAY_LEN(sa) == 3) { af = RARRAY_PTR(sa)[0]; port = RARRAY_PTR(sa)[1]; host = RARRAY_PTR(sa)[2]; } else if (RARRAY_LEN(sa) >= 4) { af = RARRAY_PTR(sa)[0]; port = RARRAY_PTR(sa)[1]; host = RARRAY_PTR(sa)[3]; if (NIL_P(host)) { host = RARRAY_PTR(sa)[2]; } else { /* * 4th element holds numeric form, don't resolve. * see rsock_ipaddr(). */ #ifdef AI_NUMERICHOST /* AIX 4.3.3 doesn't have AI_NUMERICHOST. */ hints.ai_flags |= AI_NUMERICHOST; #endif } } else { rb_raise(rb_eArgError, "array size should be 3 or 4, %ld given", RARRAY_LEN(sa)); } /* host */ if (NIL_P(host)) { hptr = NULL; } else { strncpy(hbuf, StringValuePtr(host), sizeof(hbuf)); hbuf[sizeof(hbuf) - 1] = '\0'; hptr = hbuf; } /* port */ if (NIL_P(port)) { strcpy(pbuf, "0"); pptr = NULL; } else if (FIXNUM_P(port)) { snprintf(pbuf, sizeof(pbuf), "%ld", NUM2LONG(port)); pptr = pbuf; } else { strncpy(pbuf, StringValuePtr(port), sizeof(pbuf)); pbuf[sizeof(pbuf) - 1] = '\0'; pptr = pbuf; } hints.ai_socktype = (fl & NI_DGRAM) ? SOCK_DGRAM : SOCK_STREAM; /* af */ hints.ai_family = NIL_P(af) ? PF_UNSPEC : rsock_family_arg(af); error = rb_getaddrinfo(hptr, pptr, &hints, &res); if (error) goto error_exit_addr; sap = res->ai->ai_addr; salen = res->ai->ai_addrlen; } else { rb_raise(rb_eTypeError, "expecting String or Array"); } call_nameinfo: error = rb_getnameinfo(sap, salen, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), fl); if (error) goto error_exit_name; if (res) { for (r = res->ai->ai_next; r; r = r->ai_next) { char hbuf2[1024], pbuf2[1024]; sap = r->ai_addr; salen = r->ai_addrlen; error = rb_getnameinfo(sap, salen, hbuf2, sizeof(hbuf2), pbuf2, sizeof(pbuf2), fl); if (error) goto error_exit_name; if (strcmp(hbuf, hbuf2) != 0|| strcmp(pbuf, pbuf2) != 0) { rb_freeaddrinfo(res); rb_raise(rb_eSocket, "sockaddr resolved to multiple nodename"); } } rb_freeaddrinfo(res); } return rb_assoc_new(rb_str_new2(hbuf), rb_str_new2(pbuf)); error_exit_addr: saved_errno = errno; if (res) rb_freeaddrinfo(res); errno = saved_errno; rsock_raise_socket_error("getaddrinfo", error); error_exit_name: saved_errno = errno; if (res) rb_freeaddrinfo(res); errno = saved_errno; rsock_raise_socket_error("getnameinfo", error); UNREACHABLE; } /* * call-seq: * Socket.sockaddr_in(port, host) => sockaddr * Socket.pack_sockaddr_in(port, host) => sockaddr * * Packs _port_ and _host_ as an AF_INET/AF_INET6 sockaddr string. * * Socket.sockaddr_in(80, "127.0.0.1") * #=> "\x02\x00\x00P\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00" * * Socket.sockaddr_in(80, "::1") * #=> "\n\x00\x00P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00" * */ static VALUE sock_s_pack_sockaddr_in(VALUE self, VALUE port, VALUE host) { struct rb_addrinfo *res = rsock_addrinfo(host, port, 0, 0); VALUE addr = rb_str_new((char*)res->ai->ai_addr, res->ai->ai_addrlen); rb_freeaddrinfo(res); OBJ_INFECT(addr, port); OBJ_INFECT(addr, host); return addr; } /* * call-seq: * Socket.unpack_sockaddr_in(sockaddr) => [port, ip_address] * * Unpacks _sockaddr_ into port and ip_address. * * _sockaddr_ should be a string or an addrinfo for AF_INET/AF_INET6. * * sockaddr = Socket.sockaddr_in(80, "127.0.0.1") * p sockaddr #=> "\x02\x00\x00P\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00" * p Socket.unpack_sockaddr_in(sockaddr) #=> [80, "127.0.0.1"] * */ static VALUE sock_s_unpack_sockaddr_in(VALUE self, VALUE addr) { struct sockaddr_in * sockaddr; VALUE host; sockaddr = (struct sockaddr_in*)SockAddrStringValuePtr(addr); if (RSTRING_LEN(addr) < (char*)&((struct sockaddr *)sockaddr)->sa_family + sizeof(((struct sockaddr *)sockaddr)->sa_family) - (char*)sockaddr) rb_raise(rb_eArgError, "too short sockaddr"); if (((struct sockaddr *)sockaddr)->sa_family != AF_INET #ifdef INET6 && ((struct sockaddr *)sockaddr)->sa_family != AF_INET6 #endif ) { #ifdef INET6 rb_raise(rb_eArgError, "not an AF_INET/AF_INET6 sockaddr"); #else rb_raise(rb_eArgError, "not an AF_INET sockaddr"); #endif } host = rsock_make_ipaddr((struct sockaddr*)sockaddr, RSTRING_SOCKLEN(addr)); OBJ_INFECT(host, addr); return rb_assoc_new(INT2NUM(ntohs(sockaddr->sin_port)), host); } #ifdef HAVE_SYS_UN_H /* * call-seq: * Socket.sockaddr_un(path) => sockaddr * Socket.pack_sockaddr_un(path) => sockaddr * * Packs _path_ as an AF_UNIX sockaddr string. * * Socket.sockaddr_un("/tmp/sock") #=> "\x01\x00/tmp/sock\x00\x00..." * */ static VALUE sock_s_pack_sockaddr_un(VALUE self, VALUE path) { struct sockaddr_un sockaddr; VALUE addr; StringValue(path); INIT_SOCKADDR_UN(&sockaddr, sizeof(struct sockaddr_un)); if (sizeof(sockaddr.sun_path) < (size_t)RSTRING_LEN(path)) { rb_raise(rb_eArgError, "too long unix socket path (%"PRIuSIZE" bytes given but %"PRIuSIZE" bytes max)", (size_t)RSTRING_LEN(path), sizeof(sockaddr.sun_path)); } memcpy(sockaddr.sun_path, RSTRING_PTR(path), RSTRING_LEN(path)); addr = rb_str_new((char*)&sockaddr, rsock_unix_sockaddr_len(path)); OBJ_INFECT(addr, path); return addr; } /* * call-seq: * Socket.unpack_sockaddr_un(sockaddr) => path * * Unpacks _sockaddr_ into path. * * _sockaddr_ should be a string or an addrinfo for AF_UNIX. * * sockaddr = Socket.sockaddr_un("/tmp/sock") * p Socket.unpack_sockaddr_un(sockaddr) #=> "/tmp/sock" * */ static VALUE sock_s_unpack_sockaddr_un(VALUE self, VALUE addr) { struct sockaddr_un * sockaddr; VALUE path; sockaddr = (struct sockaddr_un*)SockAddrStringValuePtr(addr); if (RSTRING_LEN(addr) < (char*)&((struct sockaddr *)sockaddr)->sa_family + sizeof(((struct sockaddr *)sockaddr)->sa_family) - (char*)sockaddr) rb_raise(rb_eArgError, "too short sockaddr"); if (((struct sockaddr *)sockaddr)->sa_family != AF_UNIX) { rb_raise(rb_eArgError, "not an AF_UNIX sockaddr"); } if (sizeof(struct sockaddr_un) < (size_t)RSTRING_LEN(addr)) { rb_raise(rb_eTypeError, "too long sockaddr_un - %ld longer than %d", RSTRING_LEN(addr), (int)sizeof(struct sockaddr_un)); } path = rsock_unixpath_str(sockaddr, RSTRING_SOCKLEN(addr)); OBJ_INFECT(path, addr); return path; } #endif #if defined(HAVE_GETIFADDRS) || defined(SIOCGLIFCONF) || defined(SIOCGIFCONF) || defined(_WIN32) static socklen_t sockaddr_len(struct sockaddr *addr) { if (addr == NULL) return 0; #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN if (addr->sa_len != 0) return addr->sa_len; #endif switch (addr->sa_family) { case AF_INET: return (socklen_t)sizeof(struct sockaddr_in); #ifdef AF_INET6 case AF_INET6: return (socklen_t)sizeof(struct sockaddr_in6); #endif #ifdef HAVE_SYS_UN_H case AF_UNIX: return (socklen_t)sizeof(struct sockaddr_un); #endif #ifdef AF_PACKET case AF_PACKET: return (socklen_t)(offsetof(struct sockaddr_ll, sll_addr) + ((struct sockaddr_ll *)addr)->sll_halen); #endif default: return (socklen_t)(offsetof(struct sockaddr, sa_family) + sizeof(addr->sa_family)); } } socklen_t rsock_sockaddr_len(struct sockaddr *addr) { return sockaddr_len(addr); } static VALUE sockaddr_obj(struct sockaddr *addr, socklen_t len) { #if defined(AF_INET6) && defined(__KAME__) struct sockaddr_in6 addr6; #endif if (addr == NULL) return Qnil; len = sockaddr_len(addr); #if defined(__KAME__) && defined(AF_INET6) if (addr->sa_family == AF_INET6) { /* KAME uses the 2nd 16bit word of link local IPv6 address as interface index internally */ /* http://orange.kame.net/dev/cvsweb.cgi/kame/IMPLEMENTATION */ /* convert fe80:1::1 to fe80::1%1 */ len = (socklen_t)sizeof(struct sockaddr_in6); memcpy(&addr6, addr, len); addr = (struct sockaddr *)&addr6; if (IN6_IS_ADDR_LINKLOCAL(&addr6.sin6_addr) && addr6.sin6_scope_id == 0 && (addr6.sin6_addr.s6_addr[2] || addr6.sin6_addr.s6_addr[3])) { addr6.sin6_scope_id = (addr6.sin6_addr.s6_addr[2] << 8) | addr6.sin6_addr.s6_addr[3]; addr6.sin6_addr.s6_addr[2] = 0; addr6.sin6_addr.s6_addr[3] = 0; } } #endif return rsock_addrinfo_new(addr, len, addr->sa_family, 0, 0, Qnil, Qnil); } VALUE rsock_sockaddr_obj(struct sockaddr *addr, socklen_t len) { return sockaddr_obj(addr, len); } #endif #if defined(HAVE_GETIFADDRS) || (defined(SIOCGLIFCONF) && defined(SIOCGLIFNUM) && !defined(__hpux)) || defined(SIOCGIFCONF) || defined(_WIN32) /* * call-seq: * Socket.ip_address_list => array * * Returns local IP addresses as an array. * * The array contains Addrinfo objects. * * pp Socket.ip_address_list * #=> [#, * #, * #, * ...] * */ static VALUE socket_s_ip_address_list(VALUE self) { #if defined(HAVE_GETIFADDRS) struct ifaddrs *ifp = NULL; struct ifaddrs *p; int ret; VALUE list; ret = getifaddrs(&ifp); if (ret == -1) { rb_sys_fail("getifaddrs"); } list = rb_ary_new(); for (p = ifp; p; p = p->ifa_next) { if (p->ifa_addr != NULL && IS_IP_FAMILY(p->ifa_addr->sa_family)) { struct sockaddr *addr = p->ifa_addr; #if defined(AF_INET6) && defined(__sun) /* * OpenIndiana SunOS 5.11 getifaddrs() returns IPv6 link local * address with sin6_scope_id == 0. * So fill it from the interface name (ifa_name). */ struct sockaddr_in6 addr6; if (addr->sa_family == AF_INET6) { socklen_t len = (socklen_t)sizeof(struct sockaddr_in6); memcpy(&addr6, addr, len); addr = (struct sockaddr *)&addr6; if (IN6_IS_ADDR_LINKLOCAL(&addr6.sin6_addr) && addr6.sin6_scope_id == 0) { unsigned int ifindex = if_nametoindex(p->ifa_name); if (ifindex != 0) { addr6.sin6_scope_id = ifindex; } } } #endif rb_ary_push(list, sockaddr_obj(addr, sockaddr_len(addr))); } } freeifaddrs(ifp); return list; #elif defined(SIOCGLIFCONF) && defined(SIOCGLIFNUM) && !defined(__hpux) /* Solaris if_tcp(7P) */ /* HP-UX has SIOCGLIFCONF too. But it uses different struct */ int fd = -1; int ret; struct lifnum ln; struct lifconf lc; char *reason = NULL; int save_errno; int i; VALUE list = Qnil; lc.lifc_buf = NULL; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd == -1) rb_sys_fail("socket(2)"); memset(&ln, 0, sizeof(ln)); ln.lifn_family = AF_UNSPEC; ret = ioctl(fd, SIOCGLIFNUM, &ln); if (ret == -1) { reason = "SIOCGLIFNUM"; goto finish; } memset(&lc, 0, sizeof(lc)); lc.lifc_family = AF_UNSPEC; lc.lifc_flags = 0; lc.lifc_len = sizeof(struct lifreq) * ln.lifn_count; lc.lifc_req = xmalloc(lc.lifc_len); ret = ioctl(fd, SIOCGLIFCONF, &lc); if (ret == -1) { reason = "SIOCGLIFCONF"; goto finish; } list = rb_ary_new(); for (i = 0; i < ln.lifn_count; i++) { struct lifreq *req = &lc.lifc_req[i]; if (IS_IP_FAMILY(req->lifr_addr.ss_family)) { if (req->lifr_addr.ss_family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_addr) && ((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_scope_id == 0) { struct lifreq req2; memcpy(req2.lifr_name, req->lifr_name, LIFNAMSIZ); ret = ioctl(fd, SIOCGLIFINDEX, &req2); if (ret == -1) { reason = "SIOCGLIFINDEX"; goto finish; } ((struct sockaddr_in6 *)(&req->lifr_addr))->sin6_scope_id = req2.lifr_index; } rb_ary_push(list, sockaddr_obj((struct sockaddr *)&req->lifr_addr, req->lifr_addrlen)); } } finish: save_errno = errno; if (lc.lifc_buf != NULL) xfree(lc.lifc_req); if (fd != -1) close(fd); errno = save_errno; if (reason) rb_sys_fail(reason); return list; #elif defined(SIOCGIFCONF) int fd = -1; int ret; #define EXTRA_SPACE ((int)(sizeof(struct ifconf) + sizeof(union_sockaddr))) char initbuf[4096+EXTRA_SPACE]; char *buf = initbuf; int bufsize; struct ifconf conf; struct ifreq *req; VALUE list = Qnil; const char *reason = NULL; int save_errno; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd == -1) rb_sys_fail("socket(2)"); bufsize = sizeof(initbuf); buf = initbuf; retry: conf.ifc_len = bufsize; conf.ifc_req = (struct ifreq *)buf; /* fprintf(stderr, "bufsize: %d\n", bufsize); */ ret = ioctl(fd, SIOCGIFCONF, &conf); if (ret == -1) { reason = "SIOCGIFCONF"; goto finish; } /* fprintf(stderr, "conf.ifc_len: %d\n", conf.ifc_len); */ if (bufsize - EXTRA_SPACE < conf.ifc_len) { if (bufsize < conf.ifc_len) { /* NetBSD returns required size for all interfaces. */ bufsize = conf.ifc_len + EXTRA_SPACE; } else { bufsize = bufsize << 1; } if (buf == initbuf) buf = NULL; buf = xrealloc(buf, bufsize); goto retry; } close(fd); fd = -1; list = rb_ary_new(); req = conf.ifc_req; while ((char*)req < (char*)conf.ifc_req + conf.ifc_len) { struct sockaddr *addr = &req->ifr_addr; if (IS_IP_FAMILY(addr->sa_family)) { rb_ary_push(list, sockaddr_obj(addr, sockaddr_len(addr))); } #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN # ifndef _SIZEOF_ADDR_IFREQ # define _SIZEOF_ADDR_IFREQ(r) \ (sizeof(struct ifreq) + \ (sizeof(struct sockaddr) < (r).ifr_addr.sa_len ? \ (r).ifr_addr.sa_len - sizeof(struct sockaddr) : \ 0)) # endif req = (struct ifreq *)((char*)req + _SIZEOF_ADDR_IFREQ(*req)); #else req = (struct ifreq *)((char*)req + sizeof(struct ifreq)); #endif } finish: save_errno = errno; if (buf != initbuf) xfree(buf); if (fd != -1) close(fd); errno = save_errno; if (reason) rb_sys_fail(reason); return list; #undef EXTRA_SPACE #elif defined(_WIN32) typedef struct ip_adapter_unicast_address_st { unsigned LONG_LONG dummy0; struct ip_adapter_unicast_address_st *Next; struct { struct sockaddr *lpSockaddr; int iSockaddrLength; } Address; int dummy1; int dummy2; int dummy3; long dummy4; long dummy5; long dummy6; } ip_adapter_unicast_address_t; typedef struct ip_adapter_anycast_address_st { unsigned LONG_LONG dummy0; struct ip_adapter_anycast_address_st *Next; struct { struct sockaddr *lpSockaddr; int iSockaddrLength; } Address; } ip_adapter_anycast_address_t; typedef struct ip_adapter_addresses_st { unsigned LONG_LONG dummy0; struct ip_adapter_addresses_st *Next; void *dummy1; ip_adapter_unicast_address_t *FirstUnicastAddress; ip_adapter_anycast_address_t *FirstAnycastAddress; void *dummy2; void *dummy3; void *dummy4; void *dummy5; void *dummy6; BYTE dummy7[8]; DWORD dummy8; DWORD dummy9; DWORD dummy10; DWORD IfType; int OperStatus; DWORD dummy12; DWORD dummy13[16]; void *dummy14; } ip_adapter_addresses_t; typedef ULONG (WINAPI *GetAdaptersAddresses_t)(ULONG, ULONG, PVOID, ip_adapter_addresses_t *, PULONG); HMODULE h; GetAdaptersAddresses_t pGetAdaptersAddresses; ULONG len; DWORD ret; ip_adapter_addresses_t *adapters; VALUE list; h = LoadLibrary("iphlpapi.dll"); if (!h) rb_notimplement(); pGetAdaptersAddresses = (GetAdaptersAddresses_t)GetProcAddress(h, "GetAdaptersAddresses"); if (!pGetAdaptersAddresses) { FreeLibrary(h); rb_notimplement(); } ret = pGetAdaptersAddresses(AF_UNSPEC, 0, NULL, NULL, &len); if (ret != ERROR_SUCCESS && ret != ERROR_BUFFER_OVERFLOW) { errno = rb_w32_map_errno(ret); FreeLibrary(h); rb_sys_fail("GetAdaptersAddresses"); } adapters = (ip_adapter_addresses_t *)ALLOCA_N(BYTE, len); ret = pGetAdaptersAddresses(AF_UNSPEC, 0, NULL, adapters, &len); if (ret != ERROR_SUCCESS) { errno = rb_w32_map_errno(ret); FreeLibrary(h); rb_sys_fail("GetAdaptersAddresses"); } list = rb_ary_new(); for (; adapters; adapters = adapters->Next) { ip_adapter_unicast_address_t *uni; ip_adapter_anycast_address_t *any; if (adapters->OperStatus != 1) /* 1 means IfOperStatusUp */ continue; for (uni = adapters->FirstUnicastAddress; uni; uni = uni->Next) { #ifndef INET6 if (uni->Address.lpSockaddr->sa_family == AF_INET) #else if (IS_IP_FAMILY(uni->Address.lpSockaddr->sa_family)) #endif rb_ary_push(list, sockaddr_obj(uni->Address.lpSockaddr, uni->Address.iSockaddrLength)); } for (any = adapters->FirstAnycastAddress; any; any = any->Next) { #ifndef INET6 if (any->Address.lpSockaddr->sa_family == AF_INET) #else if (IS_IP_FAMILY(any->Address.lpSockaddr->sa_family)) #endif rb_ary_push(list, sockaddr_obj(any->Address.lpSockaddr, any->Address.iSockaddrLength)); } } FreeLibrary(h); return list; #endif } #else #define socket_s_ip_address_list rb_f_notimplement #endif void Init_socket(void) { rsock_init_basicsocket(); /* * Document-class: Socket < BasicSocket * * Class +Socket+ provides access to the underlying operating system * socket implementations. It can be used to provide more operating system * specific functionality than the protocol-specific socket classes. * * The constants defined under Socket::Constants are also defined under * Socket. For example, Socket::AF_INET is usable as well as * Socket::Constants::AF_INET. See Socket::Constants for the list of * constants. * * === What's a socket? * * Sockets are endpoints of a bidirectional communication channel. * Sockets can communicate within a process, between processes on the same * machine or between different machines. There are many types of socket: * TCPSocket, UDPSocket or UNIXSocket for example. * * Sockets have their own vocabulary: * * *domain:* * The family of protocols: * * Socket::PF_INET * * Socket::PF_INET6 * * Socket::PF_UNIX * * etc. * * *type:* * The type of communications between the two endpoints, typically * * Socket::SOCK_STREAM * * Socket::SOCK_DGRAM. * * *protocol:* * Typically _zero_. * This may be used to identify a variant of a protocol. * * *hostname:* * The identifier of a network interface: * * a string (hostname, IPv4 or IPv6 address or +broadcast+ * which specifies a broadcast address) * * a zero-length string which specifies INADDR_ANY * * an integer (interpreted as binary address in host byte order). * * === Quick start * * Many of the classes, such as TCPSocket, UDPSocket or UNIXSocket, * ease the use of sockets comparatively to the equivalent C programming interface. * * Let's create an internet socket using the IPv4 protocol in a C-like manner: * * s = Socket.new Socket::AF_INET, Socket::SOCK_STREAM * s.connect Socket.pack_sockaddr_in(80, 'example.com') * * You could also use the TCPSocket class: * * s = TCPSocket.new 'example.com', 80 * * A simple server might look like this: * * require 'socket' * * server = TCPServer.new 2000 # Server bound to port 2000 * * loop do * client = server.accept # Wait for a client to connect * client.puts "Hello !" * client.puts "Time is #{Time.now}" * client.close * end * * A simple client may look like this: * * require 'socket' * * s = TCPSocket.new 'localhost', 2000 * * while line = s.gets # Read lines from socket * puts line # and print them * end * * s.close # close socket when done * * === Exception Handling * * Ruby's Socket implementation raises exceptions based on the error * generated by the system dependent implementation. This is why the * methods are documented in a way that isolate Unix-based system * exceptions from Windows based exceptions. If more information on a * particular exception is needed, please refer to the Unix manual pages or * the Windows WinSock reference. * * === Convenience methods * * Although the general way to create socket is Socket.new, * there are several methods of socket creation for most cases. * * TCP client socket:: * Socket.tcp, TCPSocket.open * TCP server socket:: * Socket.tcp_server_loop, TCPServer.open * UNIX client socket:: * Socket.unix, UNIXSocket.open * UNIX server socket:: * Socket.unix_server_loop, UNIXServer.open * * === Documentation by * * * Zach Dennis * * Sam Roberts * * Programming Ruby from The Pragmatic Bookshelf. * * Much material in this documentation is taken with permission from * Programming Ruby from The Pragmatic Bookshelf. */ rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); rsock_init_socket_init(); rb_define_method(rb_cSocket, "initialize", sock_initialize, -1); rb_define_method(rb_cSocket, "connect", sock_connect, 1); rb_define_method(rb_cSocket, "connect_nonblock", sock_connect_nonblock, 1); rb_define_method(rb_cSocket, "bind", sock_bind, 1); rb_define_method(rb_cSocket, "listen", rsock_sock_listen, 1); rb_define_method(rb_cSocket, "accept", sock_accept, 0); rb_define_method(rb_cSocket, "accept_nonblock", sock_accept_nonblock, 0); rb_define_method(rb_cSocket, "sysaccept", sock_sysaccept, 0); rb_define_method(rb_cSocket, "recvfrom", sock_recvfrom, -1); rb_define_method(rb_cSocket, "recvfrom_nonblock", sock_recvfrom_nonblock, -1); rb_define_singleton_method(rb_cSocket, "socketpair", rsock_sock_s_socketpair, -1); rb_define_singleton_method(rb_cSocket, "pair", rsock_sock_s_socketpair, -1); rb_define_singleton_method(rb_cSocket, "gethostname", sock_gethostname, 0); rb_define_singleton_method(rb_cSocket, "gethostbyname", sock_s_gethostbyname, 1); rb_define_singleton_method(rb_cSocket, "gethostbyaddr", sock_s_gethostbyaddr, -1); rb_define_singleton_method(rb_cSocket, "getservbyname", sock_s_getservbyname, -1); rb_define_singleton_method(rb_cSocket, "getservbyport", sock_s_getservbyport, -1); rb_define_singleton_method(rb_cSocket, "getaddrinfo", sock_s_getaddrinfo, -1); rb_define_singleton_method(rb_cSocket, "getnameinfo", sock_s_getnameinfo, -1); rb_define_singleton_method(rb_cSocket, "sockaddr_in", sock_s_pack_sockaddr_in, 2); rb_define_singleton_method(rb_cSocket, "pack_sockaddr_in", sock_s_pack_sockaddr_in, 2); rb_define_singleton_method(rb_cSocket, "unpack_sockaddr_in", sock_s_unpack_sockaddr_in, 1); #ifdef HAVE_SYS_UN_H rb_define_singleton_method(rb_cSocket, "sockaddr_un", sock_s_pack_sockaddr_un, 1); rb_define_singleton_method(rb_cSocket, "pack_sockaddr_un", sock_s_pack_sockaddr_un, 1); rb_define_singleton_method(rb_cSocket, "unpack_sockaddr_un", sock_s_unpack_sockaddr_un, 1); #endif rb_define_singleton_method(rb_cSocket, "ip_address_list", socket_s_ip_address_list, 0); }