mirror of
https://gitlab.gnome.org/GNOME/glib.git
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5cddde1fb2
Prevent the situation where errno is set by function A, then function B
is called (which is typically _(), but could be anything else) and it
overwrites errno, then errno is checked by the caller.
errno is a horrific API, and we need to be careful to save its value as
soon as a function call (which might set it) returns. i.e. Follow the
pattern:
int errsv, ret;
ret = some_call_which_might_set_errno ();
errsv = errno;
if (ret < 0)
puts (strerror (errsv));
This patch implements that pattern throughout GLib. There might be a few
places in the test code which still use errno directly. They should be
ported as necessary. It doesn’t modify all the call sites like this:
if (some_call_which_might_set_errno () && errno == ESOMETHING)
since the refactoring involved is probably more harmful than beneficial
there. It does, however, refactor other call sites regardless of whether
they were originally buggy.
https://bugzilla.gnome.org/show_bug.cgi?id=785577
703 lines
23 KiB
C
703 lines
23 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2009 Codethink Limited
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gunixconnection.h"
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#include "gnetworking.h"
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#include "gsocket.h"
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#include "gsocketcontrolmessage.h"
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#include "gunixcredentialsmessage.h"
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#include "gunixfdmessage.h"
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#include "glibintl.h"
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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/**
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* SECTION:gunixconnection
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* @title: GUnixConnection
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* @short_description: A UNIX domain GSocketConnection
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* @include: gio/gunixconnection.h
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* @see_also: #GSocketConnection.
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*
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* This is the subclass of #GSocketConnection that is created
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* for UNIX domain sockets.
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*
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* It contains functions to do some of the UNIX socket specific
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* functionality like passing file descriptors.
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*
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* Note that `<gio/gunixconnection.h>` belongs to the UNIX-specific
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* GIO interfaces, thus you have to use the `gio-unix-2.0.pc`
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* pkg-config file when using it.
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*
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* Since: 2.22
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*/
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/**
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* GUnixConnection:
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*
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* #GUnixConnection is an opaque data structure and can only be accessed
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* using the following functions.
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**/
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G_DEFINE_TYPE_WITH_CODE (GUnixConnection, g_unix_connection,
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G_TYPE_SOCKET_CONNECTION,
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g_socket_connection_factory_register_type (g_define_type_id,
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G_SOCKET_FAMILY_UNIX,
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G_SOCKET_TYPE_STREAM,
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G_SOCKET_PROTOCOL_DEFAULT);
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);
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/**
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* g_unix_connection_send_fd:
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* @connection: a #GUnixConnection
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* @fd: a file descriptor
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: (nullable): #GError for error reporting, or %NULL to ignore.
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*
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* Passes a file descriptor to the receiving side of the
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* connection. The receiving end has to call g_unix_connection_receive_fd()
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* to accept the file descriptor.
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*
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* As well as sending the fd this also writes a single byte to the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a %TRUE on success, %NULL on error.
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*
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* Since: 2.22
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*/
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gboolean
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g_unix_connection_send_fd (GUnixConnection *connection,
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gint fd,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage *scm;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (fd >= 0, FALSE);
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scm = g_unix_fd_message_new ();
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if (!g_unix_fd_message_append_fd (G_UNIX_FD_MESSAGE (scm), fd, error))
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{
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g_object_unref (scm);
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return FALSE;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket, NULL, NULL, 0, &scm, 1, 0, cancellable, error) != 1)
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/* XXX could it 'fail' with zero? */
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{
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g_object_unref (socket);
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g_object_unref (scm);
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return FALSE;
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}
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g_object_unref (socket);
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g_object_unref (scm);
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return TRUE;
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}
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/**
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* g_unix_connection_receive_fd:
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* @connection: a #GUnixConnection
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
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* @error: (nullable): #GError for error reporting, or %NULL to ignore
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*
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* Receives a file descriptor from the sending end of the connection.
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* The sending end has to call g_unix_connection_send_fd() for this
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* to work.
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*
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* As well as reading the fd this also reads a single byte from the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a file descriptor on success, -1 on error.
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*
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* Since: 2.22
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**/
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gint
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g_unix_connection_receive_fd (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage **scms;
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gint *fds, nfd, fd, nscm;
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GUnixFDMessage *fdmsg;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), -1);
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_receive_message (socket, NULL, NULL, 0,
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&scms, &nscm, NULL, cancellable, error) != 1)
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/* XXX it _could_ 'fail' with zero. */
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{
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g_object_unref (socket);
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return -1;
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}
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g_object_unref (socket);
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if (nscm != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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ngettext("Expecting 1 control message, got %d",
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"Expecting 1 control message, got %d",
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nscm),
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nscm);
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for (i = 0; i < nscm; i++)
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g_object_unref (scms[i]);
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g_free (scms);
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return -1;
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}
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if (!G_IS_UNIX_FD_MESSAGE (scms[0]))
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Unexpected type of ancillary data"));
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g_object_unref (scms[0]);
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g_free (scms);
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return -1;
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}
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fdmsg = G_UNIX_FD_MESSAGE (scms[0]);
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g_free (scms);
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fds = g_unix_fd_message_steal_fds (fdmsg, &nfd);
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g_object_unref (fdmsg);
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if (nfd != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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ngettext("Expecting one fd, but got %d\n",
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"Expecting one fd, but got %d\n",
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nfd),
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nfd);
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for (i = 0; i < nfd; i++)
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close (fds[i]);
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g_free (fds);
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return -1;
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}
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fd = *fds;
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g_free (fds);
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if (fd < 0)
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Received invalid fd"));
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fd = -1;
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}
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return fd;
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}
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static void
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g_unix_connection_init (GUnixConnection *connection)
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{
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}
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static void
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g_unix_connection_class_init (GUnixConnectionClass *class)
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{
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}
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/* TODO: Other stuff we might want to add are:
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void g_unix_connection_send_fd_async (GUnixConnection *connection,
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gint fd,
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gboolean close,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fds (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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GError **error);
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void g_unix_connection_send_fds_async (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fds_finish (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_receive_fd_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gint g_unix_connection_receive_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fake_credentials (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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GError **error);
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void g_unix_connection_send_fake_credentials_async (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fake_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_create_pair (GUnixConnection **one,
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GUnixConnection **two,
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GError **error);
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*/
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/**
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* g_unix_connection_send_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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* Passes the credentials of the current user the receiving side
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* of the connection. The receiving end has to call
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* g_unix_connection_receive_credentials() (or similar) to accept the
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* credentials.
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*
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* As well as sending the credentials this also writes a single NUL
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* byte to the stream, as this is required for credentials passing to
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* work on some implementations.
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*
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* Other ways to exchange credentials with a foreign peer includes the
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Returns: %TRUE on success, %FALSE if @error is set.
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*
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* Since: 2.26
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*/
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gboolean
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g_unix_connection_send_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *credentials;
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GSocketControlMessage *scm;
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GSocket *socket;
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gboolean ret;
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GOutputVector vector;
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guchar nul_byte[1] = {'\0'};
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gint num_messages;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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ret = FALSE;
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credentials = g_credentials_new ();
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vector.buffer = &nul_byte;
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vector.size = 1;
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if (g_unix_credentials_message_is_supported ())
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{
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scm = g_unix_credentials_message_new_with_credentials (credentials);
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num_messages = 1;
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}
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else
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{
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scm = NULL;
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num_messages = 0;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket,
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NULL, /* address */
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&vector,
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1,
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&scm,
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num_messages,
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G_SOCKET_MSG_NONE,
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cancellable,
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error) != 1)
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{
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g_prefix_error (error, _("Error sending credentials: "));
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goto out;
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}
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ret = TRUE;
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out:
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g_object_unref (socket);
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if (scm != NULL)
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g_object_unref (scm);
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g_object_unref (credentials);
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return ret;
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}
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static void
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send_credentials_async_thread (GTask *task,
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gpointer source_object,
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gpointer task_data,
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GCancellable *cancellable)
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{
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GError *error = NULL;
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if (g_unix_connection_send_credentials (G_UNIX_CONNECTION (source_object),
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cancellable,
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&error))
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g_task_return_boolean (task, TRUE);
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else
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g_task_return_error (task, error);
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g_object_unref (task);
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}
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/**
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* g_unix_connection_send_credentials_async:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
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* @user_data: (closure): the data to pass to callback function
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*
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* Asynchronously send credentials.
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*
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* For more details, see g_unix_connection_send_credentials() which is
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* the synchronous version of this call.
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*
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* When the operation is finished, @callback will be called. You can then call
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* g_unix_connection_send_credentials_finish() to get the result of the operation.
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*
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* Since: 2.32
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**/
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void
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g_unix_connection_send_credentials_async (GUnixConnection *connection,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GTask *task;
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task = g_task_new (connection, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_unix_connection_send_credentials_async);
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g_task_run_in_thread (task, send_credentials_async_thread);
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}
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/**
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* g_unix_connection_send_credentials_finish:
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* @connection: A #GUnixConnection.
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* @result: a #GAsyncResult.
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* @error: a #GError, or %NULL
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*
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* Finishes an asynchronous send credentials operation started with
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* g_unix_connection_send_credentials_async().
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*
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* Returns: %TRUE if the operation was successful, otherwise %FALSE.
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*
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* Since: 2.32
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**/
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gboolean
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g_unix_connection_send_credentials_finish (GUnixConnection *connection,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (g_task_is_valid (result, connection), FALSE);
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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/**
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* g_unix_connection_receive_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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* Receives credentials from the sending end of the connection. The
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* sending end has to call g_unix_connection_send_credentials() (or
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* similar) for this to work.
|
|
*
|
|
* As well as reading the credentials this also reads (and discards) a
|
|
* single byte from the stream, as this is required for credentials
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* passing to work on some implementations.
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|
*
|
|
* Other ways to exchange credentials with a foreign peer includes the
|
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Returns: (transfer full): Received credentials on success (free with
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* g_object_unref()), %NULL if @error is set.
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*
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* Since: 2.26
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*/
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GCredentials *
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g_unix_connection_receive_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *ret;
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GSocketControlMessage **scms;
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gint nscm;
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GSocket *socket;
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gint n;
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gssize num_bytes_read;
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#ifdef __linux__
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gboolean turn_off_so_passcreds;
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#endif
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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ret = NULL;
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scms = NULL;
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g_object_get (connection, "socket", &socket, NULL);
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/* On Linux, we need to turn on SO_PASSCRED if it isn't enabled
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* already. We also need to turn it off when we're done. See
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* #617483 for more discussion.
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*/
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#ifdef __linux__
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{
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gint opt_val;
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turn_off_so_passcreds = FALSE;
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opt_val = 0;
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if (!g_socket_get_option (socket,
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SOL_SOCKET,
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SO_PASSCRED,
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&opt_val,
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NULL))
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{
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int errsv = errno;
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error checking if SO_PASSCRED is enabled for socket: %s"),
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g_strerror (errsv));
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goto out;
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}
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if (opt_val == 0)
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{
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if (!g_socket_set_option (socket,
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SOL_SOCKET,
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SO_PASSCRED,
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TRUE,
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NULL))
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{
|
|
int errsv = errno;
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
g_io_error_from_errno (errsv),
|
|
_("Error enabling SO_PASSCRED: %s"),
|
|
g_strerror (errsv));
|
|
goto out;
|
|
}
|
|
turn_off_so_passcreds = TRUE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
g_type_ensure (G_TYPE_UNIX_CREDENTIALS_MESSAGE);
|
|
num_bytes_read = g_socket_receive_message (socket,
|
|
NULL, /* GSocketAddress **address */
|
|
NULL,
|
|
0,
|
|
&scms,
|
|
&nscm,
|
|
NULL,
|
|
cancellable,
|
|
error);
|
|
if (num_bytes_read != 1)
|
|
{
|
|
/* Handle situation where g_socket_receive_message() returns
|
|
* 0 bytes and not setting @error
|
|
*/
|
|
if (num_bytes_read == 0 && error != NULL && *error == NULL)
|
|
{
|
|
g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Expecting to read a single byte for receiving credentials but read zero bytes"));
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (g_unix_credentials_message_is_supported () &&
|
|
/* Fall back on get_credentials if the other side didn't send the credentials */
|
|
nscm > 0)
|
|
{
|
|
if (nscm != 1)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
ngettext("Expecting 1 control message, got %d",
|
|
"Expecting 1 control message, got %d",
|
|
nscm),
|
|
nscm);
|
|
goto out;
|
|
}
|
|
|
|
if (!G_IS_UNIX_CREDENTIALS_MESSAGE (scms[0]))
|
|
{
|
|
g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Unexpected type of ancillary data"));
|
|
goto out;
|
|
}
|
|
|
|
ret = g_unix_credentials_message_get_credentials (G_UNIX_CREDENTIALS_MESSAGE (scms[0]));
|
|
g_object_ref (ret);
|
|
}
|
|
else
|
|
{
|
|
if (nscm != 0)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Not expecting control message, but got %d"),
|
|
nscm);
|
|
goto out;
|
|
}
|
|
else
|
|
{
|
|
ret = g_socket_get_credentials (socket, error);
|
|
}
|
|
}
|
|
|
|
out:
|
|
|
|
#ifdef __linux__
|
|
if (turn_off_so_passcreds)
|
|
{
|
|
if (!g_socket_set_option (socket,
|
|
SOL_SOCKET,
|
|
SO_PASSCRED,
|
|
FALSE,
|
|
NULL))
|
|
{
|
|
int errsv = errno;
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
g_io_error_from_errno (errsv),
|
|
_("Error while disabling SO_PASSCRED: %s"),
|
|
g_strerror (errsv));
|
|
goto out;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (scms != NULL)
|
|
{
|
|
for (n = 0; n < nscm; n++)
|
|
g_object_unref (scms[n]);
|
|
g_free (scms);
|
|
}
|
|
g_object_unref (socket);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
receive_credentials_async_thread (GTask *task,
|
|
gpointer source_object,
|
|
gpointer task_data,
|
|
GCancellable *cancellable)
|
|
{
|
|
GCredentials *creds;
|
|
GError *error = NULL;
|
|
|
|
creds = g_unix_connection_receive_credentials (G_UNIX_CONNECTION (source_object),
|
|
cancellable,
|
|
&error);
|
|
if (creds)
|
|
g_task_return_pointer (task, creds, g_object_unref);
|
|
else
|
|
g_task_return_error (task, error);
|
|
g_object_unref (task);
|
|
}
|
|
|
|
/**
|
|
* g_unix_connection_receive_credentials_async:
|
|
* @connection: A #GUnixConnection.
|
|
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
|
|
* @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
|
|
* @user_data: (closure): the data to pass to callback function
|
|
*
|
|
* Asynchronously receive credentials.
|
|
*
|
|
* For more details, see g_unix_connection_receive_credentials() which is
|
|
* the synchronous version of this call.
|
|
*
|
|
* When the operation is finished, @callback will be called. You can then call
|
|
* g_unix_connection_receive_credentials_finish() to get the result of the operation.
|
|
*
|
|
* Since: 2.32
|
|
**/
|
|
void
|
|
g_unix_connection_receive_credentials_async (GUnixConnection *connection,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
GTask *task;
|
|
|
|
task = g_task_new (connection, cancellable, callback, user_data);
|
|
g_task_set_source_tag (task, g_unix_connection_receive_credentials_async);
|
|
g_task_run_in_thread (task, receive_credentials_async_thread);
|
|
}
|
|
|
|
/**
|
|
* g_unix_connection_receive_credentials_finish:
|
|
* @connection: A #GUnixConnection.
|
|
* @result: a #GAsyncResult.
|
|
* @error: a #GError, or %NULL
|
|
*
|
|
* Finishes an asynchronous receive credentials operation started with
|
|
* g_unix_connection_receive_credentials_async().
|
|
*
|
|
* Returns: (transfer full): a #GCredentials, or %NULL on error.
|
|
* Free the returned object with g_object_unref().
|
|
*
|
|
* Since: 2.32
|
|
**/
|
|
GCredentials *
|
|
g_unix_connection_receive_credentials_finish (GUnixConnection *connection,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (g_task_is_valid (result, connection), NULL);
|
|
|
|
return g_task_propagate_pointer (G_TASK (result), error);
|
|
}
|