Class: UNIXSocket

Inherits:
BasicSocket show all
Defined in:
unixsocket.c,
unixsocket.c

Overview

UNIXSocket represents a UNIX domain stream client socket.

Direct Known Subclasses

UNIXServer

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BasicSocket

#close_read, #close_write, #connect_address, #do_not_reverse_lookup, do_not_reverse_lookup, do_not_reverse_lookup=, #do_not_reverse_lookup=, for_fd, #getpeereid, #getpeername, #getsockname, #getsockopt, #local_address, #read_nonblock, #recv, #recv_nonblock, #recvmsg, #recvmsg_nonblock, #remote_address, #send, #sendmsg, #sendmsg_nonblock, #setsockopt, #shutdown, #write_nonblock

Constructor Details

#new(path) ⇒ Object

Creates a new UNIX client socket connected to path.

require 'socket'

s = UNIXSocket.new("/tmp/sock")
s.send "hello", 0

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# File 'unixsocket.c', line 123

static VALUE
unix_init(VALUE sock, VALUE path)
{
    return rsock_init_unixsock(sock, path, 0);
}

Class Method Details

.pair([type [, protocol]]) ⇒ Array .socketpair([type [, protocol]]) ⇒ Array

Creates a pair of sockets connected to each other.

socktype should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.

protocol should be a protocol defined in the domain. 0 is default protocol for the domain.

s1, s2 = UNIXSocket.pair
s1.send "a", 0
s1.send "b", 0
p s2.recv(10) #=> "ab"

Overloads:

  • .pair([type [, protocol]]) ⇒ Array

    Returns:

    • (Array)
  • .socketpair([type [, protocol]]) ⇒ Array

    Returns:

    • (Array)

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# File 'unixsocket.c', line 554

static VALUE
unix_s_socketpair(int argc, VALUE *argv, VALUE klass)
{
    VALUE domain, type, protocol;
    VALUE args[3];

    domain = INT2FIX(PF_UNIX);
    rb_scan_args(argc, argv, "02", &type, &protocol);
    if (argc == 0)
  type = INT2FIX(SOCK_STREAM);
    if (argc <= 1)
  protocol = INT2FIX(0);

    args[0] = domain;
    args[1] = type;
    args[2] = protocol;

    return rsock_sock_s_socketpair(3, args, klass);
}

.pair([type [, protocol]]) ⇒ Array .socketpair([type [, protocol]]) ⇒ Array

Creates a pair of sockets connected to each other.

socktype should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.

protocol should be a protocol defined in the domain. 0 is default protocol for the domain.

s1, s2 = UNIXSocket.pair
s1.send "a", 0
s1.send "b", 0
p s2.recv(10) #=> "ab"

Overloads:

  • .pair([type [, protocol]]) ⇒ Array

    Returns:

    • (Array)
  • .socketpair([type [, protocol]]) ⇒ Array

    Returns:

    • (Array)

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# File 'unixsocket.c', line 554

static VALUE
unix_s_socketpair(int argc, VALUE *argv, VALUE klass)
{
    VALUE domain, type, protocol;
    VALUE args[3];

    domain = INT2FIX(PF_UNIX);
    rb_scan_args(argc, argv, "02", &type, &protocol);
    if (argc == 0)
  type = INT2FIX(SOCK_STREAM);
    if (argc <= 1)
  protocol = INT2FIX(0);

    args[0] = domain;
    args[1] = type;
    args[2] = protocol;

    return rsock_sock_s_socketpair(3, args, klass);
}

Instance Method Details

#addrArray

Returns the local address as an array which contains address_family and unix_path.

Example

serv = UNIXServer.new("/tmp/sock")
p serv.addr #=> ["AF_UNIX", "/tmp/sock"]

Returns:

  • (Array)

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# File 'unixsocket.c', line 492

static VALUE
unix_addr(VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_un addr;
    socklen_t len = (socklen_t)sizeof addr;
    socklen_t len0 = len;

    GetOpenFile(sock, fptr);

    if (getsockname(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rsock_sys_fail_path("getsockname(2)", fptr->pathv);
    if (len0 < len) len = len0;
    return rsock_unixaddr(&addr, len);
}

#pathObject

Returns the path of the local address of unixsocket.

s = UNIXServer.new("/tmp/sock")
p s.path #=> "/tmp/sock"

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# File 'unixsocket.c', line 139

static VALUE
unix_path(VALUE sock)
{
    rb_io_t *fptr;

    GetOpenFile(sock, fptr);
    if (NIL_P(fptr->pathv)) {
  struct sockaddr_un addr;
  socklen_t len = (socklen_t)sizeof(addr);
  socklen_t len0 = len;
  if (getsockname(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
            rsock_sys_fail_path("getsockname(2)", fptr->pathv);
        if (len0 < len) len = len0;
  fptr->pathv = rb_obj_freeze(rsock_unixpath_str(&addr, len));
    }
    return rb_str_dup(fptr->pathv);
}

#peeraddrArray

Returns the remote address as an array which contains address_family and unix_path.

Example

serv = UNIXServer.new("/tmp/sock")
c = UNIXSocket.new("/tmp/sock")
p c.peeraddr #=> ["AF_UNIX", "/tmp/sock"]

Returns:

  • (Array)

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# File 'unixsocket.c', line 520

static VALUE
unix_peeraddr(VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_un addr;
    socklen_t len = (socklen_t)sizeof addr;
    socklen_t len0 = len;

    GetOpenFile(sock, fptr);

    if (getpeername(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rsock_sys_fail_path("getpeername(2)", fptr->pathv);
    if (len0 < len) len = len0;
    return rsock_unixaddr(&addr, len);
}

#recv_io([klass [, mode]]) ⇒ IO

Example

UNIXServer.open("/tmp/sock") {|serv|
  UNIXSocket.open("/tmp/sock") {|c|
    s = serv.accept

    c.send_io STDOUT
    stdout = s.recv_io

    p STDOUT.fileno #=> 1
    p stdout.fileno #=> 7

    stdout.puts "hello" # outputs "hello\n" to standard output.
  }
}

klass will determine the class of io returned (using the IO.for_fd singleton method or similar). If klass is nil, an integer file descriptor is returned.

mode is the same as the argument passed to IO.for_fd

Returns:

  • (IO)

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# File 'unixsocket.c', line 333

static VALUE
unix_recv_io(int argc, VALUE *argv, VALUE sock)
{
    VALUE klass, mode;
    rb_io_t *fptr;
    struct iomsg_arg arg;
    struct iovec vec[2];
    char buf[1];
    unsigned int gc_reason = 0;
    enum {
        GC_REASON_EMSGSIZE = 0x1,
        GC_REASON_TRUNCATE = 0x2,
        GC_REASON_ENOMEM = 0x4
    };

    int fd;
#if FD_PASSING_BY_MSG_CONTROL
    union {
  struct cmsghdr hdr;
  char pad[sizeof(struct cmsghdr)+8+sizeof(int)+8];
    } cmsg;
#endif

    rb_scan_args(argc, argv, "02", &klass, &mode);
    if (argc == 0)
  klass = rb_cIO;
    if (argc <= 1)
  mode = Qnil;

retry:
    GetOpenFile(sock, fptr);

    arg.msg.msg_name = NULL;
    arg.msg.msg_namelen = 0;

    vec[0].iov_base = buf;
    vec[0].iov_len = sizeof(buf);
    arg.msg.msg_iov = vec;
    arg.msg.msg_iovlen = 1;

#if FD_PASSING_BY_MSG_CONTROL
    arg.msg.msg_control = (caddr_t)&cmsg;
    arg.msg.msg_controllen = (socklen_t)CMSG_SPACE(sizeof(int));
    arg.msg.msg_flags = 0;
    cmsg.hdr.cmsg_len = (socklen_t)CMSG_LEN(sizeof(int));
    cmsg.hdr.cmsg_level = SOL_SOCKET;
    cmsg.hdr.cmsg_type = SCM_RIGHTS;
    fd = -1;
    memcpy(CMSG_DATA(&cmsg.hdr), &fd, sizeof(int));
#else
    arg.msg.msg_accrights = (caddr_t)&fd;
    arg.msg.msg_accrightslen = sizeof(fd);
    fd = -1;
#endif

    arg.fd = fptr->fd;
    while ((int)BLOCKING_REGION_FD(recvmsg_blocking, &arg) == -1) {
        int e = errno;
        if (e == EMSGSIZE && !(gc_reason & GC_REASON_EMSGSIZE)) {
            /* FreeBSD gets here when we're out of FDs */
            gc_reason |= GC_REASON_EMSGSIZE;
            rb_gc_for_fd(EMFILE);
            goto retry;
        }
        else if (e == ENOMEM && !(gc_reason & GC_REASON_ENOMEM)) {
            /* ENOMEM is documented in recvmsg manpages */
            gc_reason |= GC_REASON_ENOMEM;
            rb_gc_for_fd(e);
            goto retry;
        }
  if (!rb_io_wait_readable(arg.fd))
      rsock_syserr_fail_path(e, "recvmsg(2)", fptr->pathv);
    }

#if FD_PASSING_BY_MSG_CONTROL
    if (arg.msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr)) {
        /* FreeBSD and Linux both get here when we're out of FDs */
        if (!(gc_reason & GC_REASON_TRUNCATE)) {
            gc_reason |= GC_REASON_TRUNCATE;
            rb_gc_for_fd(EMFILE);
            goto retry;
        }
  rb_raise(rb_eSocket,
     "file descriptor was not passed (msg_controllen=%d smaller than sizeof(struct cmsghdr)=%d)",
     (int)arg.msg.msg_controllen, (int)sizeof(struct cmsghdr));
    }
    if (cmsg.hdr.cmsg_level != SOL_SOCKET) {
  rb_raise(rb_eSocket,
     "file descriptor was not passed (cmsg_level=%d, %d expected)",
     cmsg.hdr.cmsg_level, SOL_SOCKET);
    }
    if (cmsg.hdr.cmsg_type != SCM_RIGHTS) {
  rb_raise(rb_eSocket,
     "file descriptor was not passed (cmsg_type=%d, %d expected)",
     cmsg.hdr.cmsg_type, SCM_RIGHTS);
    }
    if (arg.msg.msg_controllen < (socklen_t)CMSG_LEN(sizeof(int))) {
  rb_raise(rb_eSocket,
     "file descriptor was not passed (msg_controllen=%d smaller than CMSG_LEN(sizeof(int))=%d)",
     (int)arg.msg.msg_controllen, (int)CMSG_LEN(sizeof(int)));
    }
    if ((socklen_t)CMSG_SPACE(sizeof(int)) < arg.msg.msg_controllen) {
  rb_raise(rb_eSocket,
     "file descriptor was not passed (msg_controllen=%d bigger than CMSG_SPACE(sizeof(int))=%d)",
     (int)arg.msg.msg_controllen, (int)CMSG_SPACE(sizeof(int)));
    }
    if (cmsg.hdr.cmsg_len != CMSG_LEN(sizeof(int))) {
  rsock_discard_cmsg_resource(&arg.msg, 0);
  rb_raise(rb_eSocket,
     "file descriptor was not passed (cmsg_len=%d, %d expected)",
     (int)cmsg.hdr.cmsg_len, (int)CMSG_LEN(sizeof(int)));
    }
#else
    if (arg.msg.msg_accrightslen != sizeof(fd)) {
  rb_raise(rb_eSocket,
     "file descriptor was not passed (accrightslen=%d, %d expected)",
     arg.msg.msg_accrightslen, (int)sizeof(fd));
    }
#endif

#if FD_PASSING_BY_MSG_CONTROL
    memcpy(&fd, CMSG_DATA(&cmsg.hdr), sizeof(int));
#endif

    rb_update_max_fd(fd);

    if (rsock_cmsg_cloexec_state < 0)
  rsock_cmsg_cloexec_state = rsock_detect_cloexec(fd);
    if (rsock_cmsg_cloexec_state == 0 || fd <= 2)
  rb_maygvl_fd_fix_cloexec(fd);

    if (klass == Qnil)
  return INT2FIX(fd);
    else {
  ID for_fd;
  int ff_argc;
  VALUE ff_argv[2];
  CONST_ID(for_fd, "for_fd");
  ff_argc = mode == Qnil ? 1 : 2;
  ff_argv[0] = INT2FIX(fd);
  ff_argv[1] = mode;
        return rb_funcallv(klass, for_fd, ff_argc, ff_argv);
    }
}

#recvfrom(maxlen[, flags[, outbuf]]) ⇒ Array

Receives a message via unixsocket.

maxlen is the maximum number of bytes to receive.

flags should be a bitwise OR of Socket::MSG_* constants.

outbuf will contain only the received data after the method call even if it is not empty at the beginning.

s1 = Socket.new(:UNIX, :DGRAM, 0)
s1_ai = Addrinfo.unix("/tmp/sock1")
s1.bind(s1_ai)

s2 = Socket.new(:UNIX, :DGRAM, 0)
s2_ai = Addrinfo.unix("/tmp/sock2")
s2.bind(s2_ai)
s3 = UNIXSocket.for_fd(s2.fileno)

s1.send "a", 0, s2_ai
p s3.recvfrom(10) #=> ["a", ["AF_UNIX", "/tmp/sock1"]]

Returns:

  • (Array)

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# File 'unixsocket.c', line 183

static VALUE
unix_recvfrom(int argc, VALUE *argv, VALUE sock)
{
    return rsock_s_recvfrom(sock, argc, argv, RECV_UNIX);
}

#send_io(io) ⇒ nil

Sends io as file descriptor passing.

s1, s2 = UNIXSocket.pair

s1.send_io STDOUT
stdout = s2.recv_io

p STDOUT.fileno #=> 1
p stdout.fileno #=> 6

stdout.puts "hello" # outputs "hello\n" to standard output.

io may be any kind of IO object or integer file descriptor.

Returns:

  • (nil)

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# File 'unixsocket.c', line 232

static VALUE
unix_send_io(VALUE sock, VALUE val)
{
    int fd;
    rb_io_t *fptr;
    struct iomsg_arg arg;
    struct iovec vec[1];
    char buf[1];

#if FD_PASSING_BY_MSG_CONTROL
    union {
  struct cmsghdr hdr;
  char pad[sizeof(struct cmsghdr)+8+sizeof(int)+8];
    } cmsg;
#endif

    if (rb_obj_is_kind_of(val, rb_cIO)) {
        rb_io_t *valfptr;
  GetOpenFile(val, valfptr);
  fd = valfptr->fd;
    }
    else if (FIXNUM_P(val)) {
        fd = FIX2INT(val);
    }
    else {
  rb_raise(rb_eTypeError, "neither IO nor file descriptor");
    }

    GetOpenFile(sock, fptr);

    arg.msg.msg_name = NULL;
    arg.msg.msg_namelen = 0;

    /* Linux and Solaris doesn't work if msg_iov is NULL. */
    buf[0] = '\0';
    vec[0].iov_base = buf;
    vec[0].iov_len = 1;
    arg.msg.msg_iov = vec;
    arg.msg.msg_iovlen = 1;

#if FD_PASSING_BY_MSG_CONTROL
    arg.msg.msg_control = (caddr_t)&cmsg;
    arg.msg.msg_controllen = (socklen_t)CMSG_LEN(sizeof(int));
    arg.msg.msg_flags = 0;
    MEMZERO((char*)&cmsg, char, sizeof(cmsg));
    cmsg.hdr.cmsg_len = (socklen_t)CMSG_LEN(sizeof(int));
    cmsg.hdr.cmsg_level = SOL_SOCKET;
    cmsg.hdr.cmsg_type = SCM_RIGHTS;
    memcpy(CMSG_DATA(&cmsg.hdr), &fd, sizeof(int));
#else
    arg.msg.msg_accrights = (caddr_t)&fd;
    arg.msg.msg_accrightslen = sizeof(fd);
#endif

    arg.fd = fptr->fd;
    while ((int)BLOCKING_REGION_FD(sendmsg_blocking, &arg) == -1) {
  if (!rb_io_wait_writable(arg.fd))
      rsock_sys_fail_path("sendmsg(2)", fptr->pathv);
    }

    return Qnil;
}