+++ /dev/null
-/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
-/* dbus-sysdeps-unix.c Wrappers around UNIX system/libc features (internal to D-Bus implementation)
- *
- * Copyright (C) 2002, 2003, 2006 Red Hat, Inc.
- * Copyright (C) 2003 CodeFactory AB
- *
- * Licensed under the Academic Free License version 2.1
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-#define _GNU_SOURCE
-
-#include "dbus-internals.h"
-#include "dbus-sysdeps.h"
-#include "dbus-sysdeps-unix.h"
-#include "dbus-threads.h"
-#include "dbus-protocol.h"
-#include "dbus-transport.h"
-#include "dbus-string.h"
-#include "dbus-userdb.h"
-#include "dbus-list.h"
-#include "dbus-credentials.h"
-
-#include <sys/types.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <dirent.h>
-#include <sys/un.h>
-#include <pwd.h>
-#include <time.h>
-#include <locale.h>
-#include <sys/time.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-#include <netinet/in.h>
-#include <netdb.h>
-#include <grp.h>
-
-#ifdef HAVE_ERRNO_H
-#include <errno.h>
-#endif
-#ifdef HAVE_WRITEV
-#include <sys/uio.h>
-#endif
-#ifdef HAVE_POLL
-#include <sys/poll.h>
-#endif
-#ifdef HAVE_BACKTRACE
-#include <execinfo.h>
-#endif
-#ifdef HAVE_GETPEERUCRED
-#include <ucred.h>
-#endif
-
-#ifdef HAVE_ADT
-#include <bsm/adt.h>
-#endif
-
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
-#ifndef AI_ADDRCONFIG
-#define AI_ADDRCONFIG 0
-#endif
-
-#ifndef HAVE_SOCKLEN_T
-#define socklen_t int
-#endif
-
-static dbus_bool_t
-_dbus_open_socket (int *fd_p,
- int domain,
- int type,
- int protocol,
- DBusError *error)
-{
- *fd_p = socket (domain, type, protocol);
- if (*fd_p >= 0)
- {
- _dbus_verbose ("socket fd %d opened\n", *fd_p);
- return TRUE;
- }
- else
- {
- dbus_set_error(error,
- _dbus_error_from_errno (errno),
- "Failed to open socket: %s",
- _dbus_strerror (errno));
- return FALSE;
- }
-}
-
-dbus_bool_t
-_dbus_open_tcp_socket (int *fd,
- DBusError *error)
-{
- return _dbus_open_socket(fd, AF_INET, SOCK_STREAM, 0, error);
-}
-
-/**
- * Opens a UNIX domain socket (as in the socket() call).
- * Does not bind the socket.
- * @param fd return location for socket descriptor
- * @param error return location for an error
- * @returns #FALSE if error is set
- */
-dbus_bool_t
-_dbus_open_unix_socket (int *fd,
- DBusError *error)
-{
- return _dbus_open_socket(fd, PF_UNIX, SOCK_STREAM, 0, error);
-}
-
-/**
- * Closes a socket. Should not be used on non-socket
- * file descriptors or handles.
- *
- * @param fd the socket
- * @param error return location for an error
- * @returns #FALSE if error is set
- */
-dbus_bool_t
-_dbus_close_socket (int fd,
- DBusError *error)
-{
- return _dbus_close (fd, error);
-}
-
-/**
- * Like _dbus_read(), but only works on sockets so is
- * available on Windows.
- *
- * @param fd the socket
- * @param buffer string to append data to
- * @param count max amount of data to read
- * @returns number of bytes appended to the string
- */
-int
-_dbus_read_socket (int fd,
- DBusString *buffer,
- int count)
-{
- return _dbus_read (fd, buffer, count);
-}
-
-/**
- * Like _dbus_write(), but only supports sockets
- * and is thus available on Windows.
- *
- * @param fd the file descriptor to write
- * @param buffer the buffer to write data from
- * @param start the first byte in the buffer to write
- * @param len the number of bytes to try to write
- * @returns the number of bytes written or -1 on error
- */
-int
-_dbus_write_socket (int fd,
- const DBusString *buffer,
- int start,
- int len)
-{
- return _dbus_write (fd, buffer, start, len);
-}
-
-/**
- * write data to a pipe.
- *
- * @param pipe the pipe instance
- * @param buffer the buffer to write data from
- * @param start the first byte in the buffer to write
- * @param len the number of bytes to try to write
- * @param error error return
- * @returns the number of bytes written or -1 on error
- */
-int
-_dbus_pipe_write (DBusPipe *pipe,
- const DBusString *buffer,
- int start,
- int len,
- DBusError *error)
-{
- int written;
-
- written = _dbus_write (pipe->fd_or_handle, buffer, start, len);
- if (written < 0)
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Writing to pipe: %s\n",
- _dbus_strerror (errno));
- }
- return written;
-}
-
-/**
- * close a pipe.
- *
- * @param pipe the pipe instance
- * @param error return location for an error
- * @returns #FALSE if error is set
- */
-int
-_dbus_pipe_close (DBusPipe *pipe,
- DBusError *error)
-{
- if (_dbus_close (pipe->fd_or_handle, error) < 0)
- {
- return -1;
- }
- else
- {
- _dbus_pipe_invalidate (pipe);
- return 0;
- }
-}
-
-/**
- * Like _dbus_write_two() but only works on sockets and is thus
- * available on Windows.
- *
- * @param fd the file descriptor
- * @param buffer1 first buffer
- * @param start1 first byte to write in first buffer
- * @param len1 number of bytes to write from first buffer
- * @param buffer2 second buffer, or #NULL
- * @param start2 first byte to write in second buffer
- * @param len2 number of bytes to write in second buffer
- * @returns total bytes written from both buffers, or -1 on error
- */
-int
-_dbus_write_socket_two (int fd,
- const DBusString *buffer1,
- int start1,
- int len1,
- const DBusString *buffer2,
- int start2,
- int len2)
-{
- return _dbus_write_two (fd, buffer1, start1, len1,
- buffer2, start2, len2);
-}
-
-
-/**
- * Thin wrapper around the read() system call that appends
- * the data it reads to the DBusString buffer. It appends
- * up to the given count, and returns the same value
- * and same errno as read(). The only exception is that
- * _dbus_read() handles EINTR for you. Also, _dbus_read() can
- * return ENOMEM, even though regular UNIX read doesn't.
- *
- * Unlike _dbus_read_socket(), _dbus_read() is not available
- * on Windows.
- *
- * @param fd the file descriptor to read from
- * @param buffer the buffer to append data to
- * @param count the amount of data to read
- * @returns the number of bytes read or -1
- */
-int
-_dbus_read (int fd,
- DBusString *buffer,
- int count)
-{
- int bytes_read;
- int start;
- char *data;
-
- _dbus_assert (count >= 0);
-
- start = _dbus_string_get_length (buffer);
-
- if (!_dbus_string_lengthen (buffer, count))
- {
- errno = ENOMEM;
- return -1;
- }
-
- data = _dbus_string_get_data_len (buffer, start, count);
-
- again:
-
- bytes_read = read (fd, data, count);
-
- if (bytes_read < 0)
- {
- if (errno == EINTR)
- goto again;
- else
- {
- /* put length back (note that this doesn't actually realloc anything) */
- _dbus_string_set_length (buffer, start);
- return -1;
- }
- }
- else
- {
- /* put length back (doesn't actually realloc) */
- _dbus_string_set_length (buffer, start + bytes_read);
-
-#if 0
- if (bytes_read > 0)
- _dbus_verbose_bytes_of_string (buffer, start, bytes_read);
-#endif
-
- return bytes_read;
- }
-}
-
-/**
- * Thin wrapper around the write() system call that writes a part of a
- * DBusString and handles EINTR for you.
- *
- * @param fd the file descriptor to write
- * @param buffer the buffer to write data from
- * @param start the first byte in the buffer to write
- * @param len the number of bytes to try to write
- * @returns the number of bytes written or -1 on error
- */
-int
-_dbus_write (int fd,
- const DBusString *buffer,
- int start,
- int len)
-{
- const char *data;
- int bytes_written;
-
- data = _dbus_string_get_const_data_len (buffer, start, len);
-
- again:
-
- bytes_written = write (fd, data, len);
-
- if (bytes_written < 0 && errno == EINTR)
- goto again;
-
-#if 0
- if (bytes_written > 0)
- _dbus_verbose_bytes_of_string (buffer, start, bytes_written);
-#endif
-
- return bytes_written;
-}
-
-/**
- * Like _dbus_write() but will use writev() if possible
- * to write both buffers in sequence. The return value
- * is the number of bytes written in the first buffer,
- * plus the number written in the second. If the first
- * buffer is written successfully and an error occurs
- * writing the second, the number of bytes in the first
- * is returned (i.e. the error is ignored), on systems that
- * don't have writev. Handles EINTR for you.
- * The second buffer may be #NULL.
- *
- * @param fd the file descriptor
- * @param buffer1 first buffer
- * @param start1 first byte to write in first buffer
- * @param len1 number of bytes to write from first buffer
- * @param buffer2 second buffer, or #NULL
- * @param start2 first byte to write in second buffer
- * @param len2 number of bytes to write in second buffer
- * @returns total bytes written from both buffers, or -1 on error
- */
-int
-_dbus_write_two (int fd,
- const DBusString *buffer1,
- int start1,
- int len1,
- const DBusString *buffer2,
- int start2,
- int len2)
-{
- _dbus_assert (buffer1 != NULL);
- _dbus_assert (start1 >= 0);
- _dbus_assert (start2 >= 0);
- _dbus_assert (len1 >= 0);
- _dbus_assert (len2 >= 0);
-
-#ifdef HAVE_WRITEV
- {
- struct iovec vectors[2];
- const char *data1;
- const char *data2;
- int bytes_written;
-
- data1 = _dbus_string_get_const_data_len (buffer1, start1, len1);
-
- if (buffer2 != NULL)
- data2 = _dbus_string_get_const_data_len (buffer2, start2, len2);
- else
- {
- data2 = NULL;
- start2 = 0;
- len2 = 0;
- }
-
- vectors[0].iov_base = (char*) data1;
- vectors[0].iov_len = len1;
- vectors[1].iov_base = (char*) data2;
- vectors[1].iov_len = len2;
-
- again:
-
- bytes_written = writev (fd,
- vectors,
- data2 ? 2 : 1);
-
- if (bytes_written < 0 && errno == EINTR)
- goto again;
-
- return bytes_written;
- }
-#else /* HAVE_WRITEV */
- {
- int ret1;
-
- ret1 = _dbus_write (fd, buffer1, start1, len1);
- if (ret1 == len1 && buffer2 != NULL)
- {
- ret2 = _dbus_write (fd, buffer2, start2, len2);
- if (ret2 < 0)
- ret2 = 0; /* we can't report an error as the first write was OK */
-
- return ret1 + ret2;
- }
- else
- return ret1;
- }
-#endif /* !HAVE_WRITEV */
-}
-
-#define _DBUS_MAX_SUN_PATH_LENGTH 99
-
-/**
- * @def _DBUS_MAX_SUN_PATH_LENGTH
- *
- * Maximum length of the path to a UNIX domain socket,
- * sockaddr_un::sun_path member. POSIX requires that all systems
- * support at least 100 bytes here, including the nul termination.
- * We use 99 for the max value to allow for the nul.
- *
- * We could probably also do sizeof (addr.sun_path)
- * but this way we are the same on all platforms
- * which is probably a good idea.
- */
-
-/**
- * Creates a socket and connects it to the UNIX domain socket at the
- * given path. The connection fd is returned, and is set up as
- * nonblocking.
- *
- * Uses abstract sockets instead of filesystem-linked sockets if
- * requested (it's possible only on Linux; see "man 7 unix" on Linux).
- * On non-Linux abstract socket usage always fails.
- *
- * @param path the path to UNIX domain socket
- * @param abstract #TRUE to use abstract namespace
- * @param error return location for error code
- * @returns connection file descriptor or -1 on error
- */
-int
-_dbus_connect_unix_socket (const char *path,
- dbus_bool_t abstract,
- DBusError *error)
-{
- int fd;
- size_t path_len;
- struct sockaddr_un addr;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- _dbus_verbose ("connecting to unix socket %s abstract=%d\n",
- path, abstract);
-
-
- if (!_dbus_open_unix_socket (&fd, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET(error);
- return -1;
- }
- _DBUS_ASSERT_ERROR_IS_CLEAR(error);
-
- _DBUS_ZERO (addr);
- addr.sun_family = AF_UNIX;
- path_len = strlen (path);
-
- if (abstract)
- {
-#ifdef HAVE_ABSTRACT_SOCKETS
- addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
- path_len++; /* Account for the extra nul byte added to the start of sun_path */
-
- if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
- {
- dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
- "Abstract socket name too long\n");
- _dbus_close (fd, NULL);
- return -1;
- }
-
- strncpy (&addr.sun_path[1], path, path_len);
- /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
-#else /* HAVE_ABSTRACT_SOCKETS */
- dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
- "Operating system does not support abstract socket namespace\n");
- _dbus_close (fd, NULL);
- return -1;
-#endif /* ! HAVE_ABSTRACT_SOCKETS */
- }
- else
- {
- if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
- {
- dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
- "Socket name too long\n");
- _dbus_close (fd, NULL);
- return -1;
- }
-
- strncpy (addr.sun_path, path, path_len);
- }
-
- if (connect (fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Failed to connect to socket %s: %s",
- path, _dbus_strerror (errno));
-
- _dbus_close (fd, NULL);
- fd = -1;
-
- return -1;
- }
-
- if (!_dbus_set_fd_nonblocking (fd, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET (error);
-
- _dbus_close (fd, NULL);
- fd = -1;
-
- return -1;
- }
-
- return fd;
-}
-
-/**
- * Enables or disables the reception of credentials on the given socket during
- * the next message transmission. This is only effective if the #LOCAL_CREDS
- * system feature exists, in which case the other side of the connection does
- * not have to do anything special to send the credentials.
- *
- * @param fd socket on which to change the #LOCAL_CREDS flag.
- * @param on whether to enable or disable the #LOCAL_CREDS flag.
- */
-static dbus_bool_t
-_dbus_set_local_creds (int fd, dbus_bool_t on)
-{
- dbus_bool_t retval = TRUE;
-
-#if defined(HAVE_CMSGCRED)
- /* NOOP just to make sure only one codepath is used
- * and to prefer CMSGCRED
- */
-#elif defined(LOCAL_CREDS)
- int val = on ? 1 : 0;
- if (setsockopt (fd, 0, LOCAL_CREDS, &val, sizeof (val)) < 0)
- {
- _dbus_verbose ("Unable to set LOCAL_CREDS socket option on fd %d\n", fd);
- retval = FALSE;
- }
- else
- _dbus_verbose ("LOCAL_CREDS %s for further messages on fd %d\n",
- on ? "enabled" : "disabled", fd);
-#endif
-
- return retval;
-}
-
-/**
- * Creates a socket and binds it to the given path,
- * then listens on the socket. The socket is
- * set to be nonblocking.
- *
- * Uses abstract sockets instead of filesystem-linked
- * sockets if requested (it's possible only on Linux;
- * see "man 7 unix" on Linux).
- * On non-Linux abstract socket usage always fails.
- *
- * @param path the socket name
- * @param abstract #TRUE to use abstract namespace
- * @param error return location for errors
- * @returns the listening file descriptor or -1 on error
- */
-int
-_dbus_listen_unix_socket (const char *path,
- dbus_bool_t abstract,
- DBusError *error)
-{
- int listen_fd;
- struct sockaddr_un addr;
- size_t path_len;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- _dbus_verbose ("listening on unix socket %s abstract=%d\n",
- path, abstract);
-
- if (!_dbus_open_unix_socket (&listen_fd, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET(error);
- return -1;
- }
- _DBUS_ASSERT_ERROR_IS_CLEAR(error);
-
- _DBUS_ZERO (addr);
- addr.sun_family = AF_UNIX;
- path_len = strlen (path);
-
- if (abstract)
- {
-#ifdef HAVE_ABSTRACT_SOCKETS
- /* remember that abstract names aren't nul-terminated so we rely
- * on sun_path being filled in with zeroes above.
- */
- addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
- path_len++; /* Account for the extra nul byte added to the start of sun_path */
-
- if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
- {
- dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
- "Abstract socket name too long\n");
- _dbus_close (listen_fd, NULL);
- return -1;
- }
-
- strncpy (&addr.sun_path[1], path, path_len);
- /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
-#else /* HAVE_ABSTRACT_SOCKETS */
- dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
- "Operating system does not support abstract socket namespace\n");
- _dbus_close (listen_fd, NULL);
- return -1;
-#endif /* ! HAVE_ABSTRACT_SOCKETS */
- }
- else
- {
- /* Discussed security implications of this with Nalin,
- * and we couldn't think of where it would kick our ass, but
- * it still seems a bit sucky. It also has non-security suckage;
- * really we'd prefer to exit if the socket is already in use.
- * But there doesn't seem to be a good way to do this.
- *
- * Just to be extra careful, I threw in the stat() - clearly
- * the stat() can't *fix* any security issue, but it at least
- * avoids inadvertent/accidental data loss.
- */
- {
- struct stat sb;
-
- if (stat (path, &sb) == 0 &&
- S_ISSOCK (sb.st_mode))
- unlink (path);
- }
-
- if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
- {
- dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
- "Abstract socket name too long\n");
- _dbus_close (listen_fd, NULL);
- return -1;
- }
-
- strncpy (addr.sun_path, path, path_len);
- }
-
- if (bind (listen_fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to bind socket \"%s\": %s",
- path, _dbus_strerror (errno));
- _dbus_close (listen_fd, NULL);
- return -1;
- }
-
- if (listen (listen_fd, 30 /* backlog */) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to listen on socket \"%s\": %s",
- path, _dbus_strerror (errno));
- _dbus_close (listen_fd, NULL);
- return -1;
- }
-
- if (!_dbus_set_local_creds (listen_fd, TRUE))
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to enable LOCAL_CREDS on socket \"%s\": %s",
- path, _dbus_strerror (errno));
- close (listen_fd);
- return -1;
- }
-
- if (!_dbus_set_fd_nonblocking (listen_fd, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET (error);
- _dbus_close (listen_fd, NULL);
- return -1;
- }
-
- /* Try opening up the permissions, but if we can't, just go ahead
- * and continue, maybe it will be good enough.
- */
- if (!abstract && chmod (path, 0777) < 0)
- _dbus_warn ("Could not set mode 0777 on socket %s\n",
- path);
-
- return listen_fd;
-}
-
-/**
- * Creates a socket and connects to a socket at the given host
- * and port. The connection fd is returned, and is set up as
- * nonblocking.
- *
- * @param host the host name to connect to
- * @param port the port to connect to
- * @param family the address family to listen on, NULL for all
- * @param error return location for error code
- * @returns connection file descriptor or -1 on error
- */
-int
-_dbus_connect_tcp_socket (const char *host,
- const char *port,
- const char *family,
- DBusError *error)
-{
- int fd = -1, res;
- struct addrinfo hints;
- struct addrinfo *ai, *tmp;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- if (!_dbus_open_tcp_socket (&fd, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET(error);
- return -1;
- }
-
- _DBUS_ASSERT_ERROR_IS_CLEAR(error);
-
- _DBUS_ZERO (hints);
-
- if (!family)
- hints.ai_family = AF_UNSPEC;
- else if (!strcmp(family, "ipv4"))
- hints.ai_family = AF_INET;
- else if (!strcmp(family, "ipv6"))
- hints.ai_family = AF_INET6;
- else
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Unknown address family %s", family);
- return -1;
- }
- hints.ai_protocol = IPPROTO_TCP;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_ADDRCONFIG;
-
- if ((res = getaddrinfo(host, port, &hints, &ai)) != 0)
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Failed to lookup host/port: \"%s:%s\": %s (%d)",
- host, port, gai_strerror(res), res);
- _dbus_close (fd, NULL);
- return -1;
- }
-
- tmp = ai;
- while (tmp)
- {
- if (!_dbus_open_socket (&fd, tmp->ai_family, SOCK_STREAM, 0, error))
- {
- freeaddrinfo(ai);
- _DBUS_ASSERT_ERROR_IS_SET(error);
- return -1;
- }
- _DBUS_ASSERT_ERROR_IS_CLEAR(error);
-
- if (connect (fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
- {
- _dbus_close(fd, NULL);
- fd = -1;
- tmp = tmp->ai_next;
- continue;
- }
-
- break;
- }
- freeaddrinfo(ai);
-
- if (fd == -1)
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Failed to connect to socket \"%s:%s\" %s",
- host, port, _dbus_strerror(errno));
- return -1;
- }
-
-
- if (!_dbus_set_fd_nonblocking (fd, error))
- {
- _dbus_close (fd, NULL);
- fd = -1;
-
- return -1;
- }
-
- return fd;
-}
-
-/**
- * Creates a socket and binds it to the given path, then listens on
- * the socket. The socket is set to be nonblocking. In case of port=0
- * a random free port is used and returned in the port parameter.
- * If inaddr_any is specified, the hostname is ignored.
- *
- * @param host the host name to listen on
- * @param port the port to listen on, if zero a free port will be used
- * @param family the address family to listen on, NULL for all
- * @param retport string to return the actual port listened on
- * @param fds_p location to store returned file descriptors
- * @param error return location for errors
- * @returns the number of listening file descriptors or -1 on error
- */
-int
-_dbus_listen_tcp_socket (const char *host,
- const char *port,
- const char *family,
- DBusString *retport,
- int **fds_p,
- DBusError *error)
-{
- int nlisten_fd = 0, *listen_fd = NULL, res, i;
- struct addrinfo hints;
- struct addrinfo *ai, *tmp;
-
- *fds_p = NULL;
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- _DBUS_ZERO (hints);
-
- if (!family)
- hints.ai_family = AF_UNSPEC;
- else if (!strcmp(family, "ipv4"))
- hints.ai_family = AF_INET;
- else if (!strcmp(family, "ipv6"))
- hints.ai_family = AF_INET6;
- else
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Unknown address family %s", family);
- return -1;
- }
-
- hints.ai_protocol = IPPROTO_TCP;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
-
- redo_lookup_with_port:
- if ((res = getaddrinfo(host, port, &hints, &ai)) != 0 || !ai)
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Failed to lookup host/port: \"%s:%s\": %s (%d)",
- host ? host : "*", port, gai_strerror(res), res);
- return -1;
- }
-
- tmp = ai;
- while (tmp)
- {
- int fd = -1, *newlisten_fd;
- if (!_dbus_open_socket (&fd, tmp->ai_family, SOCK_STREAM, 0, error))
- {
- _DBUS_ASSERT_ERROR_IS_SET(error);
- goto failed;
- }
- _DBUS_ASSERT_ERROR_IS_CLEAR(error);
-
- if (bind (fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
- {
- _dbus_close(fd, NULL);
- if (errno == EADDRINUSE)
- {
- /* Depending on kernel policy, it may or may not
- be neccessary to bind to both IPv4 & 6 addresses
- so ignore EADDRINUSE here */
- tmp = tmp->ai_next;
- continue;
- }
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to bind socket \"%s:%s\": %s",
- host ? host : "*", port, _dbus_strerror (errno));
- goto failed;
- }
-
- if (listen (fd, 30 /* backlog */) < 0)
- {
- _dbus_close (fd, NULL);
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to listen on socket \"%s:%s\": %s",
- host ? host : "*", port, _dbus_strerror (errno));
- goto failed;
- }
-
- newlisten_fd = dbus_realloc(listen_fd, sizeof(int)*(nlisten_fd+1));
- if (!newlisten_fd)
- {
- _dbus_close (fd, NULL);
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to allocate file handle array: %s",
- _dbus_strerror (errno));
- goto failed;
- }
- listen_fd = newlisten_fd;
- listen_fd[nlisten_fd] = fd;
- nlisten_fd++;
-
- if (!_dbus_string_get_length(retport))
- {
- /* If the user didn't specify a port, or used 0, then
- the kernel chooses a port. After the first address
- is bound to, we need to force all remaining addresses
- to use the same port */
- if (!port || !strcmp(port, "0"))
- {
- struct sockaddr_storage addr;
- socklen_t addrlen;
- char portbuf[50];
-
- addrlen = sizeof(addr);
- getsockname(fd, (struct sockaddr*) &addr, &addrlen);
-
- if ((res = getnameinfo((struct sockaddr*)&addr, addrlen, NULL, 0,
- portbuf, sizeof(portbuf),
- NI_NUMERICHOST)) != 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to resolve port \"%s:%s\": %s (%s)",
- host ? host : "*", port, gai_strerror(res), res);
- goto failed;
- }
- if (!_dbus_string_append(retport, portbuf))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- goto failed;
- }
-
- /* Release current address list & redo lookup */
- port = _dbus_string_get_const_data(retport);
- freeaddrinfo(ai);
- goto redo_lookup_with_port;
- }
- else
- {
- if (!_dbus_string_append(retport, port))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- goto failed;
- }
- }
- }
-
- tmp = tmp->ai_next;
- }
- freeaddrinfo(ai);
- ai = NULL;
-
- if (!nlisten_fd)
- {
- errno = EADDRINUSE;
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to bind socket \"%s:%s\": %s",
- host ? host : "*", port, _dbus_strerror (errno));
- return -1;
- }
-
- for (i = 0 ; i < nlisten_fd ; i++)
- {
- if (!_dbus_set_fd_nonblocking (listen_fd[i], error))
- {
- goto failed;
- }
- }
-
- *fds_p = listen_fd;
-
- return nlisten_fd;
-
- failed:
- if (ai)
- freeaddrinfo(ai);
- for (i = 0 ; i < nlisten_fd ; i++)
- _dbus_close(listen_fd[i], NULL);
- dbus_free(listen_fd);
- return -1;
-}
-
-static dbus_bool_t
-write_credentials_byte (int server_fd,
- DBusError *error)
-{
- int bytes_written;
- char buf[1] = { '\0' };
-#if defined(HAVE_CMSGCRED)
- struct {
- struct cmsghdr hdr;
- struct cmsgcred cred;
- } cmsg;
- struct iovec iov;
- struct msghdr msg;
- iov.iov_base = buf;
- iov.iov_len = 1;
-
- memset (&msg, 0, sizeof (msg));
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
- msg.msg_control = &cmsg;
- msg.msg_controllen = sizeof (cmsg);
- memset (&cmsg, 0, sizeof (cmsg));
- cmsg.hdr.cmsg_len = sizeof (cmsg);
- cmsg.hdr.cmsg_level = SOL_SOCKET;
- cmsg.hdr.cmsg_type = SCM_CREDS;
-#endif
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- again:
-
-#if defined(HAVE_CMSGCRED)
- bytes_written = sendmsg (server_fd, &msg, 0);
-#else
- bytes_written = write (server_fd, buf, 1);
-#endif
-
- if (bytes_written < 0 && errno == EINTR)
- goto again;
-
- if (bytes_written < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to write credentials byte: %s",
- _dbus_strerror (errno));
- return FALSE;
- }
- else if (bytes_written == 0)
- {
- dbus_set_error (error, DBUS_ERROR_IO_ERROR,
- "wrote zero bytes writing credentials byte");
- return FALSE;
- }
- else
- {
- _dbus_assert (bytes_written == 1);
- _dbus_verbose ("wrote credentials byte\n");
- return TRUE;
- }
-}
-
-/**
- * Reads a single byte which must be nul (an error occurs otherwise),
- * and reads unix credentials if available. Clears the credentials
- * object, then adds pid/uid if available, so any previous credentials
- * stored in the object are lost.
- *
- * Return value indicates whether a byte was read, not whether
- * we got valid credentials. On some systems, such as Linux,
- * reading/writing the byte isn't actually required, but we do it
- * anyway just to avoid multiple codepaths.
- *
- * Fails if no byte is available, so you must select() first.
- *
- * The point of the byte is that on some systems we have to
- * use sendmsg()/recvmsg() to transmit credentials.
- *
- * @param client_fd the client file descriptor
- * @param credentials object to add client credentials to
- * @param error location to store error code
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_read_credentials_socket (int client_fd,
- DBusCredentials *credentials,
- DBusError *error)
-{
- struct msghdr msg;
- struct iovec iov;
- char buf;
- dbus_uid_t uid_read;
- dbus_pid_t pid_read;
- int bytes_read;
-
- uid_read = DBUS_UID_UNSET;
- pid_read = DBUS_PID_UNSET;
-
-#ifdef HAVE_CMSGCRED
- struct {
- struct cmsghdr hdr;
- struct cmsgcred cred;
- } cmsg;
-
-#elif defined(LOCAL_CREDS)
- struct {
- struct cmsghdr hdr;
- struct sockcred cred;
- } cmsg;
-#endif
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- /* The POSIX spec certainly doesn't promise this, but
- * we need these assertions to fail as soon as we're wrong about
- * it so we can do the porting fixups
- */
- _dbus_assert (sizeof (pid_t) <= sizeof (dbus_pid_t));
- _dbus_assert (sizeof (uid_t) <= sizeof (dbus_uid_t));
- _dbus_assert (sizeof (gid_t) <= sizeof (dbus_gid_t));
-
- _dbus_credentials_clear (credentials);
-
- /* Systems supporting LOCAL_CREDS are configured to have this feature
- * enabled (if it does not conflict with HAVE_CMSGCRED) prior accepting
- * the connection. Therefore, the received message must carry the
- * credentials information without doing anything special.
- */
-
- iov.iov_base = &buf;
- iov.iov_len = 1;
-
- memset (&msg, 0, sizeof (msg));
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
-#if defined(HAVE_CMSGCRED) || defined(LOCAL_CREDS)
- memset (&cmsg, 0, sizeof (cmsg));
- msg.msg_control = &cmsg;
- msg.msg_controllen = sizeof (cmsg);
-#endif
-
- again:
- bytes_read = recvmsg (client_fd, &msg, 0);
-
- if (bytes_read < 0)
- {
- if (errno == EINTR)
- goto again;
-
- /* EAGAIN or EWOULDBLOCK would be unexpected here since we would
- * normally only call read_credentials if the socket was ready
- * for reading
- */
-
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to read credentials byte: %s",
- _dbus_strerror (errno));
- return FALSE;
- }
- else if (bytes_read == 0)
- {
- /* this should not happen unless we are using recvmsg wrong,
- * so is essentially here for paranoia
- */
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Failed to read credentials byte (zero-length read)");
- return FALSE;
- }
- else if (buf != '\0')
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Credentials byte was not nul");
- return FALSE;
- }
-
-#if defined(HAVE_CMSGCRED) || defined(LOCAL_CREDS)
- if (cmsg.hdr.cmsg_len < sizeof (cmsg) || cmsg.hdr.cmsg_type != SCM_CREDS)
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Message from recvmsg() was not SCM_CREDS");
- return FALSE;
- }
-#endif
-
- _dbus_verbose ("read credentials byte\n");
-
- {
-#ifdef SO_PEERCRED
- struct ucred cr;
- int cr_len = sizeof (cr);
-
- if (getsockopt (client_fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 &&
- cr_len == sizeof (cr))
- {
- pid_read = cr.pid;
- uid_read = cr.uid;
- }
- else
- {
- _dbus_verbose ("Failed to getsockopt() credentials, returned len %d/%d: %s\n",
- cr_len, (int) sizeof (cr), _dbus_strerror (errno));
- }
-#elif defined(HAVE_CMSGCRED)
- pid_read = cmsg.cred.cmcred_pid;
- uid_read = cmsg.cred.cmcred_euid;
-#elif defined(LOCAL_CREDS)
- pid_read = DBUS_PID_UNSET;
- uid_read = cmsg.cred.sc_uid;
- /* Since we have already got the credentials from this socket, we can
- * disable its LOCAL_CREDS flag if it was ever set. */
- _dbus_set_local_creds (client_fd, FALSE);
-#elif defined(HAVE_GETPEEREID)
- uid_t euid;
- gid_t egid;
- if (getpeereid (client_fd, &euid, &egid) == 0)
- {
- uid_read = euid;
- }
- else
- {
- _dbus_verbose ("Failed to getpeereid() credentials: %s\n", _dbus_strerror (errno));
- }
-#elif defined(HAVE_GETPEERUCRED)
- ucred_t * ucred = NULL;
- if (getpeerucred (client_fd, &ucred) == 0)
- {
- pid_read = ucred_getpid (ucred);
- uid_read = ucred_geteuid (ucred);
-#ifdef HAVE_ADT
- /* generate audit session data based on socket ucred */
- adt_session_data_t *adth = NULL;
- adt_export_data_t *data = NULL;
- size_t size = 0;
- if (adt_start_session (&adth, NULL, 0) || (adth == NULL))
- {
- _dbus_verbose ("Failed to adt_start_session(): %s\n", _dbus_strerror (errno));
- }
- else
- {
- if (adt_set_from_ucred (adth, ucred, ADT_NEW))
- {
- _dbus_verbose ("Failed to adt_set_from_ucred(): %s\n", _dbus_strerror (errno));
- }
- else
- {
- size = adt_export_session_data (adth, &data);
- if (size <= 0)
- {
- _dbus_verbose ("Failed to adt_export_session_data(): %s\n", _dbus_strerror (errno));
- }
- else
- {
- _dbus_credentials_add_adt_audit_data (credentials, data, size);
- free (data);
- }
- }
- (void) adt_end_session (adth);
- }
-#endif /* HAVE_ADT */
- }
- else
- {
- _dbus_verbose ("Failed to getpeerucred() credentials: %s\n", _dbus_strerror (errno));
- }
- if (ucred != NULL)
- ucred_free (ucred);
-#else /* !SO_PEERCRED && !HAVE_CMSGCRED && !HAVE_GETPEEREID && !HAVE_GETPEERUCRED */
- _dbus_verbose ("Socket credentials not supported on this OS\n");
-#endif
- }
-
- _dbus_verbose ("Credentials:"
- " pid "DBUS_PID_FORMAT
- " uid "DBUS_UID_FORMAT
- "\n",
- pid_read,
- uid_read);
-
- if (pid_read != DBUS_PID_UNSET)
- {
- if (!_dbus_credentials_add_unix_pid (credentials, pid_read))
- {
- _DBUS_SET_OOM (error);
- return FALSE;
- }
- }
-
- if (uid_read != DBUS_UID_UNSET)
- {
- if (!_dbus_credentials_add_unix_uid (credentials, uid_read))
- {
- _DBUS_SET_OOM (error);
- return FALSE;
- }
- }
-
- return TRUE;
-}
-
-/**
- * Sends a single nul byte with our UNIX credentials as ancillary
- * data. Returns #TRUE if the data was successfully written. On
- * systems that don't support sending credentials, just writes a byte,
- * doesn't send any credentials. On some systems, such as Linux,
- * reading/writing the byte isn't actually required, but we do it
- * anyway just to avoid multiple codepaths.
- *
- * Fails if no byte can be written, so you must select() first.
- *
- * The point of the byte is that on some systems we have to
- * use sendmsg()/recvmsg() to transmit credentials.
- *
- * @param server_fd file descriptor for connection to server
- * @param error return location for error code
- * @returns #TRUE if the byte was sent
- */
-dbus_bool_t
-_dbus_send_credentials_socket (int server_fd,
- DBusError *error)
-{
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- if (write_credentials_byte (server_fd, error))
- return TRUE;
- else
- return FALSE;
-}
-
-/**
- * Accepts a connection on a listening socket.
- * Handles EINTR for you.
- *
- * @param listen_fd the listen file descriptor
- * @returns the connection fd of the client, or -1 on error
- */
-int
-_dbus_accept (int listen_fd)
-{
- int client_fd;
- struct sockaddr addr;
- socklen_t addrlen;
-
- addrlen = sizeof (addr);
-
- retry:
- client_fd = accept (listen_fd, &addr, &addrlen);
-
- if (client_fd < 0)
- {
- if (errno == EINTR)
- goto retry;
- }
-
- _dbus_verbose ("client fd %d accepted\n", client_fd);
-
- return client_fd;
-}
-
-/**
- * Checks to make sure the given directory is
- * private to the user
- *
- * @param dir the name of the directory
- * @param error error return
- * @returns #FALSE on failure
- **/
-dbus_bool_t
-_dbus_check_dir_is_private_to_user (DBusString *dir, DBusError *error)
-{
- const char *directory;
- struct stat sb;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- directory = _dbus_string_get_const_data (dir);
-
- if (stat (directory, &sb) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "%s", _dbus_strerror (errno));
-
- return FALSE;
- }
-
- if ((S_IROTH & sb.st_mode) || (S_IWOTH & sb.st_mode) ||
- (S_IRGRP & sb.st_mode) || (S_IWGRP & sb.st_mode))
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "%s directory is not private to the user", directory);
- return FALSE;
- }
-
- return TRUE;
-}
-
-static dbus_bool_t
-fill_user_info_from_passwd (struct passwd *p,
- DBusUserInfo *info,
- DBusError *error)
-{
- _dbus_assert (p->pw_name != NULL);
- _dbus_assert (p->pw_dir != NULL);
-
- info->uid = p->pw_uid;
- info->primary_gid = p->pw_gid;
- info->username = _dbus_strdup (p->pw_name);
- info->homedir = _dbus_strdup (p->pw_dir);
-
- if (info->username == NULL ||
- info->homedir == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- return FALSE;
- }
-
- return TRUE;
-}
-
-static dbus_bool_t
-fill_user_info (DBusUserInfo *info,
- dbus_uid_t uid,
- const DBusString *username,
- DBusError *error)
-{
- const char *username_c;
-
- /* exactly one of username/uid provided */
- _dbus_assert (username != NULL || uid != DBUS_UID_UNSET);
- _dbus_assert (username == NULL || uid == DBUS_UID_UNSET);
-
- info->uid = DBUS_UID_UNSET;
- info->primary_gid = DBUS_GID_UNSET;
- info->group_ids = NULL;
- info->n_group_ids = 0;
- info->username = NULL;
- info->homedir = NULL;
-
- if (username != NULL)
- username_c = _dbus_string_get_const_data (username);
- else
- username_c = NULL;
-
- /* For now assuming that the getpwnam() and getpwuid() flavors
- * are always symmetrical, if not we have to add more configure
- * checks
- */
-
-#if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
- {
- struct passwd *p;
- int result;
- size_t buflen;
- char *buf;
- struct passwd p_str;
-
- /* retrieve maximum needed size for buf */
- buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
-
- /* sysconf actually returns a long, but everything else expects size_t,
- * so just recast here.
- * https://bugs.freedesktop.org/show_bug.cgi?id=17061
- */
- if ((long) buflen <= 0)
- buflen = 1024;
-
- result = -1;
- while (1)
- {
- buf = dbus_malloc (buflen);
- if (buf == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- return FALSE;
- }
-
- p = NULL;
-#ifdef HAVE_POSIX_GETPWNAM_R
- if (uid != DBUS_UID_UNSET)
- result = getpwuid_r (uid, &p_str, buf, buflen,
- &p);
- else
- result = getpwnam_r (username_c, &p_str, buf, buflen,
- &p);
-#else
- if (uid != DBUS_UID_UNSET)
- p = getpwuid_r (uid, &p_str, buf, buflen);
- else
- p = getpwnam_r (username_c, &p_str, buf, buflen);
- result = 0;
-#endif /* !HAVE_POSIX_GETPWNAM_R */
- //Try a bigger buffer if ERANGE was returned
- if (result == ERANGE && buflen < 512 * 1024)
- {
- dbus_free (buf);
- buflen *= 2;
- }
- else
- {
- break;
- }
- }
- if (result == 0 && p == &p_str)
- {
- if (!fill_user_info_from_passwd (p, info, error))
- {
- dbus_free (buf);
- return FALSE;
- }
- dbus_free (buf);
- }
- else
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "User \"%s\" unknown or no memory to allocate password entry\n",
- username_c ? username_c : "???");
- _dbus_verbose ("User %s unknown\n", username_c ? username_c : "???");
- dbus_free (buf);
- return FALSE;
- }
- }
-#else /* ! HAVE_GETPWNAM_R */
- {
- /* I guess we're screwed on thread safety here */
- struct passwd *p;
-
- if (uid != DBUS_UID_UNSET)
- p = getpwuid (uid);
- else
- p = getpwnam (username_c);
-
- if (p != NULL)
- {
- if (!fill_user_info_from_passwd (p, info, error))
- {
- return FALSE;
- }
- }
- else
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "User \"%s\" unknown or no memory to allocate password entry\n",
- username_c ? username_c : "???");
- _dbus_verbose ("User %s unknown\n", username_c ? username_c : "???");
- return FALSE;
- }
- }
-#endif /* ! HAVE_GETPWNAM_R */
-
- /* Fill this in so we can use it to get groups */
- username_c = info->username;
-
-#ifdef HAVE_GETGROUPLIST
- {
- gid_t *buf;
- int buf_count;
- int i;
-
- buf_count = 17;
- buf = dbus_new (gid_t, buf_count);
- if (buf == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- goto failed;
- }
-
- if (getgrouplist (username_c,
- info->primary_gid,
- buf, &buf_count) < 0)
- {
- gid_t *new = dbus_realloc (buf, buf_count * sizeof (buf[0]));
- if (new == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- dbus_free (buf);
- goto failed;
- }
-
- buf = new;
-
- errno = 0;
- if (getgrouplist (username_c, info->primary_gid, buf, &buf_count) < 0)
- {
- dbus_set_error (error,
- _dbus_error_from_errno (errno),
- "Failed to get groups for username \"%s\" primary GID "
- DBUS_GID_FORMAT ": %s\n",
- username_c, info->primary_gid,
- _dbus_strerror (errno));
- dbus_free (buf);
- goto failed;
- }
- }
-
- info->group_ids = dbus_new (dbus_gid_t, buf_count);
- if (info->group_ids == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- dbus_free (buf);
- goto failed;
- }
-
- for (i = 0; i < buf_count; ++i)
- info->group_ids[i] = buf[i];
-
- info->n_group_ids = buf_count;
-
- dbus_free (buf);
- }
-#else /* HAVE_GETGROUPLIST */
- {
- /* We just get the one group ID */
- info->group_ids = dbus_new (dbus_gid_t, 1);
- if (info->group_ids == NULL)
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- goto failed;
- }
-
- info->n_group_ids = 1;
-
- (info->group_ids)[0] = info->primary_gid;
- }
-#endif /* HAVE_GETGROUPLIST */
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- return TRUE;
-
- failed:
- _DBUS_ASSERT_ERROR_IS_SET (error);
- return FALSE;
-}
-
-/**
- * Gets user info for the given username.
- *
- * @param info user info object to initialize
- * @param username the username
- * @param error error return
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_user_info_fill (DBusUserInfo *info,
- const DBusString *username,
- DBusError *error)
-{
- return fill_user_info (info, DBUS_UID_UNSET,
- username, error);
-}
-
-/**
- * Gets user info for the given user ID.
- *
- * @param info user info object to initialize
- * @param uid the user ID
- * @param error error return
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_user_info_fill_uid (DBusUserInfo *info,
- dbus_uid_t uid,
- DBusError *error)
-{
- return fill_user_info (info, uid,
- NULL, error);
-}
-
-/**
- * Adds the credentials of the current process to the
- * passed-in credentials object.
- *
- * @param credentials credentials to add to
- * @returns #FALSE if no memory; does not properly roll back on failure, so only some credentials may have been added
- */
-dbus_bool_t
-_dbus_credentials_add_from_current_process (DBusCredentials *credentials)
-{
- /* The POSIX spec certainly doesn't promise this, but
- * we need these assertions to fail as soon as we're wrong about
- * it so we can do the porting fixups
- */
- _dbus_assert (sizeof (pid_t) <= sizeof (dbus_pid_t));
- _dbus_assert (sizeof (uid_t) <= sizeof (dbus_uid_t));
- _dbus_assert (sizeof (gid_t) <= sizeof (dbus_gid_t));
-
- if (!_dbus_credentials_add_unix_pid(credentials, _dbus_getpid()))
- return FALSE;
- if (!_dbus_credentials_add_unix_uid(credentials, _dbus_geteuid()))
- return FALSE;
-
- return TRUE;
-}
-
-/**
- * Append to the string the identity we would like to have when we
- * authenticate, on UNIX this is the current process UID and on
- * Windows something else, probably a Windows SID string. No escaping
- * is required, that is done in dbus-auth.c. The username here
- * need not be anything human-readable, it can be the machine-readable
- * form i.e. a user id.
- *
- * @param str the string to append to
- * @returns #FALSE on no memory
- */
-dbus_bool_t
-_dbus_append_user_from_current_process (DBusString *str)
-{
- return _dbus_string_append_uint (str,
- _dbus_geteuid ());
-}
-
-/**
- * Gets our process ID
- * @returns process ID
- */
-dbus_pid_t
-_dbus_getpid (void)
-{
- return getpid ();
-}
-
-/** Gets our UID
- * @returns process UID
- */
-dbus_uid_t
-_dbus_getuid (void)
-{
- return getuid ();
-}
-
-/** Gets our effective UID
- * @returns process effective UID
- */
-dbus_uid_t
-_dbus_geteuid (void)
-{
- return geteuid ();
-}
-
-/**
- * The only reason this is separate from _dbus_getpid() is to allow it
- * on Windows for logging but not for other purposes.
- *
- * @returns process ID to put in log messages
- */
-unsigned long
-_dbus_pid_for_log (void)
-{
- return getpid ();
-}
-
-/**
- * Gets a UID from a UID string.
- *
- * @param uid_str the UID in string form
- * @param uid UID to fill in
- * @returns #TRUE if successfully filled in UID
- */
-dbus_bool_t
-_dbus_parse_uid (const DBusString *uid_str,
- dbus_uid_t *uid)
-{
- int end;
- long val;
-
- if (_dbus_string_get_length (uid_str) == 0)
- {
- _dbus_verbose ("UID string was zero length\n");
- return FALSE;
- }
-
- val = -1;
- end = 0;
- if (!_dbus_string_parse_int (uid_str, 0, &val,
- &end))
- {
- _dbus_verbose ("could not parse string as a UID\n");
- return FALSE;
- }
-
- if (end != _dbus_string_get_length (uid_str))
- {
- _dbus_verbose ("string contained trailing stuff after UID\n");
- return FALSE;
- }
-
- *uid = val;
-
- return TRUE;
-}
-
-
-_DBUS_DEFINE_GLOBAL_LOCK (atomic);
-
-#if DBUS_USE_ATOMIC_INT_486_COND
-/* Taken from CVS version 1.7 of glibc's sysdeps/i386/i486/atomicity.h */
-/* Since the asm stuff here is gcc-specific we go ahead and use "inline" also */
-static inline dbus_int32_t
-atomic_exchange_and_add (DBusAtomic *atomic,
- volatile dbus_int32_t val)
-{
- register dbus_int32_t result;
-
- __asm__ __volatile__ ("lock; xaddl %0,%1"
- : "=r" (result), "=m" (atomic->value)
- : "0" (val), "m" (atomic->value));
- return result;
-}
-#endif
-
-/**
- * Atomically increments an integer
- *
- * @param atomic pointer to the integer to increment
- * @returns the value before incrementing
- *
- * @todo implement arch-specific faster atomic ops
- */
-dbus_int32_t
-_dbus_atomic_inc (DBusAtomic *atomic)
-{
-#if DBUS_USE_ATOMIC_INT_486_COND
- return atomic_exchange_and_add (atomic, 1);
-#else
- dbus_int32_t res;
- _DBUS_LOCK (atomic);
- res = atomic->value;
- atomic->value += 1;
- _DBUS_UNLOCK (atomic);
- return res;
-#endif
-}
-
-/**
- * Atomically decrement an integer
- *
- * @param atomic pointer to the integer to decrement
- * @returns the value before decrementing
- *
- * @todo implement arch-specific faster atomic ops
- */
-dbus_int32_t
-_dbus_atomic_dec (DBusAtomic *atomic)
-{
-#if DBUS_USE_ATOMIC_INT_486_COND
- return atomic_exchange_and_add (atomic, -1);
-#else
- dbus_int32_t res;
-
- _DBUS_LOCK (atomic);
- res = atomic->value;
- atomic->value -= 1;
- _DBUS_UNLOCK (atomic);
- return res;
-#endif
-}
-
-#ifdef DBUS_BUILD_TESTS
-/** Gets our GID
- * @returns process GID
- */
-dbus_gid_t
-_dbus_getgid (void)
-{
- return getgid ();
-}
-#endif
-
-/**
- * Wrapper for poll().
- *
- * @param fds the file descriptors to poll
- * @param n_fds number of descriptors in the array
- * @param timeout_milliseconds timeout or -1 for infinite
- * @returns numbers of fds with revents, or <0 on error
- */
-int
-_dbus_poll (DBusPollFD *fds,
- int n_fds,
- int timeout_milliseconds)
-{
-#if defined(HAVE_POLL) && !defined(BROKEN_POLL)
- /* This big thing is a constant expression and should get optimized
- * out of existence. So it's more robust than a configure check at
- * no cost.
- */
- if (_DBUS_POLLIN == POLLIN &&
- _DBUS_POLLPRI == POLLPRI &&
- _DBUS_POLLOUT == POLLOUT &&
- _DBUS_POLLERR == POLLERR &&
- _DBUS_POLLHUP == POLLHUP &&
- _DBUS_POLLNVAL == POLLNVAL &&
- sizeof (DBusPollFD) == sizeof (struct pollfd) &&
- _DBUS_STRUCT_OFFSET (DBusPollFD, fd) ==
- _DBUS_STRUCT_OFFSET (struct pollfd, fd) &&
- _DBUS_STRUCT_OFFSET (DBusPollFD, events) ==
- _DBUS_STRUCT_OFFSET (struct pollfd, events) &&
- _DBUS_STRUCT_OFFSET (DBusPollFD, revents) ==
- _DBUS_STRUCT_OFFSET (struct pollfd, revents))
- {
- return poll ((struct pollfd*) fds,
- n_fds,
- timeout_milliseconds);
- }
- else
- {
- /* We have to convert the DBusPollFD to an array of
- * struct pollfd, poll, and convert back.
- */
- _dbus_warn ("didn't implement poll() properly for this system yet\n");
- return -1;
- }
-#else /* ! HAVE_POLL */
-
- fd_set read_set, write_set, err_set;
- int max_fd = 0;
- int i;
- struct timeval tv;
- int ready;
-
- FD_ZERO (&read_set);
- FD_ZERO (&write_set);
- FD_ZERO (&err_set);
-
- for (i = 0; i < n_fds; i++)
- {
- DBusPollFD *fdp = &fds[i];
-
- if (fdp->events & _DBUS_POLLIN)
- FD_SET (fdp->fd, &read_set);
-
- if (fdp->events & _DBUS_POLLOUT)
- FD_SET (fdp->fd, &write_set);
-
- FD_SET (fdp->fd, &err_set);
-
- max_fd = MAX (max_fd, fdp->fd);
- }
-
- tv.tv_sec = timeout_milliseconds / 1000;
- tv.tv_usec = (timeout_milliseconds % 1000) * 1000;
-
- ready = select (max_fd + 1, &read_set, &write_set, &err_set,
- timeout_milliseconds < 0 ? NULL : &tv);
-
- if (ready > 0)
- {
- for (i = 0; i < n_fds; i++)
- {
- DBusPollFD *fdp = &fds[i];
-
- fdp->revents = 0;
-
- if (FD_ISSET (fdp->fd, &read_set))
- fdp->revents |= _DBUS_POLLIN;
-
- if (FD_ISSET (fdp->fd, &write_set))
- fdp->revents |= _DBUS_POLLOUT;
-
- if (FD_ISSET (fdp->fd, &err_set))
- fdp->revents |= _DBUS_POLLERR;
- }
- }
-
- return ready;
-#endif
-}
-
-/**
- * Get current time, as in gettimeofday().
- *
- * @param tv_sec return location for number of seconds
- * @param tv_usec return location for number of microseconds (thousandths)
- */
-void
-_dbus_get_current_time (long *tv_sec,
- long *tv_usec)
-{
- struct timeval t;
-
- gettimeofday (&t, NULL);
-
- if (tv_sec)
- *tv_sec = t.tv_sec;
- if (tv_usec)
- *tv_usec = t.tv_usec;
-}
-
-/**
- * Appends the contents of the given file to the string,
- * returning error code. At the moment, won't open a file
- * more than a megabyte in size.
- *
- * @param str the string to append to
- * @param filename filename to load
- * @param error place to set an error
- * @returns #FALSE if error was set
- */
-dbus_bool_t
-_dbus_file_get_contents (DBusString *str,
- const DBusString *filename,
- DBusError *error)
-{
- int fd;
- struct stat sb;
- int orig_len;
- int total;
- const char *filename_c;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- filename_c = _dbus_string_get_const_data (filename);
-
- /* O_BINARY useful on Cygwin */
- fd = open (filename_c, O_RDONLY | O_BINARY);
- if (fd < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to open \"%s\": %s",
- filename_c,
- _dbus_strerror (errno));
- return FALSE;
- }
-
- _dbus_verbose ("file fd %d opened\n", fd);
-
- if (fstat (fd, &sb) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to stat \"%s\": %s",
- filename_c,
- _dbus_strerror (errno));
-
- _dbus_verbose ("fstat() failed: %s",
- _dbus_strerror (errno));
-
- _dbus_close (fd, NULL);
-
- return FALSE;
- }
-
- if (sb.st_size > _DBUS_ONE_MEGABYTE)
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "File size %lu of \"%s\" is too large.",
- (unsigned long) sb.st_size, filename_c);
- _dbus_close (fd, NULL);
- return FALSE;
- }
-
- total = 0;
- orig_len = _dbus_string_get_length (str);
- if (sb.st_size > 0 && S_ISREG (sb.st_mode))
- {
- int bytes_read;
-
- while (total < (int) sb.st_size)
- {
- bytes_read = _dbus_read (fd, str,
- sb.st_size - total);
- if (bytes_read <= 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Error reading \"%s\": %s",
- filename_c,
- _dbus_strerror (errno));
-
- _dbus_verbose ("read() failed: %s",
- _dbus_strerror (errno));
-
- _dbus_close (fd, NULL);
- _dbus_string_set_length (str, orig_len);
- return FALSE;
- }
- else
- total += bytes_read;
- }
-
- _dbus_close (fd, NULL);
- return TRUE;
- }
- else if (sb.st_size != 0)
- {
- _dbus_verbose ("Can only open regular files at the moment.\n");
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "\"%s\" is not a regular file",
- filename_c);
- _dbus_close (fd, NULL);
- return FALSE;
- }
- else
- {
- _dbus_close (fd, NULL);
- return TRUE;
- }
-}
-
-/**
- * Writes a string out to a file. If the file exists,
- * it will be atomically overwritten by the new data.
- *
- * @param str the string to write out
- * @param filename the file to save string to
- * @param error error to be filled in on failure
- * @returns #FALSE on failure
- */
-dbus_bool_t
-_dbus_string_save_to_file (const DBusString *str,
- const DBusString *filename,
- DBusError *error)
-{
- int fd;
- int bytes_to_write;
- const char *filename_c;
- DBusString tmp_filename;
- const char *tmp_filename_c;
- int total;
- dbus_bool_t need_unlink;
- dbus_bool_t retval;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- fd = -1;
- retval = FALSE;
- need_unlink = FALSE;
-
- if (!_dbus_string_init (&tmp_filename))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- return FALSE;
- }
-
- if (!_dbus_string_copy (filename, 0, &tmp_filename, 0))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- _dbus_string_free (&tmp_filename);
- return FALSE;
- }
-
- if (!_dbus_string_append (&tmp_filename, "."))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- _dbus_string_free (&tmp_filename);
- return FALSE;
- }
-
-#define N_TMP_FILENAME_RANDOM_BYTES 8
- if (!_dbus_generate_random_ascii (&tmp_filename, N_TMP_FILENAME_RANDOM_BYTES))
- {
- dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
- _dbus_string_free (&tmp_filename);
- return FALSE;
- }
-
- filename_c = _dbus_string_get_const_data (filename);
- tmp_filename_c = _dbus_string_get_const_data (&tmp_filename);
-
- fd = open (tmp_filename_c, O_WRONLY | O_BINARY | O_EXCL | O_CREAT,
- 0600);
- if (fd < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not create %s: %s", tmp_filename_c,
- _dbus_strerror (errno));
- goto out;
- }
-
- _dbus_verbose ("tmp file fd %d opened\n", fd);
-
- need_unlink = TRUE;
-
- total = 0;
- bytes_to_write = _dbus_string_get_length (str);
-
- while (total < bytes_to_write)
- {
- int bytes_written;
-
- bytes_written = _dbus_write (fd, str, total,
- bytes_to_write - total);
-
- if (bytes_written <= 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not write to %s: %s", tmp_filename_c,
- _dbus_strerror (errno));
-
- goto out;
- }
-
- total += bytes_written;
- }
-
- if (fsync(fd))
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not synchronize file %s: %s",
- tmp_filename_c, _dbus_strerror (errno));
-
- goto out;
- }
-
- if (!_dbus_close (fd, NULL))
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not close file %s: %s",
- tmp_filename_c, _dbus_strerror (errno));
-
- goto out;
- }
-
- fd = -1;
-
- if (rename (tmp_filename_c, filename_c) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not rename %s to %s: %s",
- tmp_filename_c, filename_c,
- _dbus_strerror (errno));
-
- goto out;
- }
-
- need_unlink = FALSE;
-
- retval = TRUE;
-
- out:
- /* close first, then unlink, to prevent ".nfs34234235" garbage
- * files
- */
-
- if (fd >= 0)
- _dbus_close (fd, NULL);
-
- if (need_unlink && unlink (tmp_filename_c) < 0)
- _dbus_verbose ("Failed to unlink temp file %s: %s\n",
- tmp_filename_c, _dbus_strerror (errno));
-
- _dbus_string_free (&tmp_filename);
-
- if (!retval)
- _DBUS_ASSERT_ERROR_IS_SET (error);
-
- return retval;
-}
-
-/** Makes the file readable by every user in the system.
- *
- * @param filename the filename
- * @param error error location
- * @returns #TRUE if the file's permissions could be changed.
- */
-dbus_bool_t
-_dbus_make_file_world_readable(const DBusString *filename,
- DBusError *error)
-{
- const char *filename_c;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- filename_c = _dbus_string_get_const_data (filename);
- if (chmod (filename_c, 0644) == -1)
- {
- dbus_set_error (error,
- DBUS_ERROR_FAILED,
- "Could not change permissions of file %s: %s\n",
- filename_c,
- _dbus_strerror (errno));
- return FALSE;
- }
- return TRUE;
-}
-
-/** Creates the given file, failing if the file already exists.
- *
- * @param filename the filename
- * @param error error location
- * @returns #TRUE if we created the file and it didn't exist
- */
-dbus_bool_t
-_dbus_create_file_exclusively (const DBusString *filename,
- DBusError *error)
-{
- int fd;
- const char *filename_c;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- filename_c = _dbus_string_get_const_data (filename);
-
- fd = open (filename_c, O_WRONLY | O_BINARY | O_EXCL | O_CREAT,
- 0600);
- if (fd < 0)
- {
- dbus_set_error (error,
- DBUS_ERROR_FAILED,
- "Could not create file %s: %s\n",
- filename_c,
- _dbus_strerror (errno));
- return FALSE;
- }
-
- _dbus_verbose ("exclusive file fd %d opened\n", fd);
-
- if (!_dbus_close (fd, NULL))
- {
- dbus_set_error (error,
- DBUS_ERROR_FAILED,
- "Could not close file %s: %s\n",
- filename_c,
- _dbus_strerror (errno));
- return FALSE;
- }
-
- return TRUE;
-}
-
-/**
- * Deletes the given file.
- *
- * @param filename the filename
- * @param error error location
- *
- * @returns #TRUE if unlink() succeeded
- */
-dbus_bool_t
-_dbus_delete_file (const DBusString *filename,
- DBusError *error)
-{
- const char *filename_c;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- filename_c = _dbus_string_get_const_data (filename);
-
- if (unlink (filename_c) < 0)
- {
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Failed to delete file %s: %s\n",
- filename_c, _dbus_strerror (errno));
- return FALSE;
- }
- else
- return TRUE;
-}
-
-/**
- * Creates a directory; succeeds if the directory
- * is created or already existed.
- *
- * @param filename directory filename
- * @param error initialized error object
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_create_directory (const DBusString *filename,
- DBusError *error)
-{
- const char *filename_c;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- filename_c = _dbus_string_get_const_data (filename);
-
- if (mkdir (filename_c, 0700) < 0)
- {
- if (errno == EEXIST)
- return TRUE;
-
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "Failed to create directory %s: %s\n",
- filename_c, _dbus_strerror (errno));
- return FALSE;
- }
- else
- return TRUE;
-}
-
-/**
- * Appends the given filename to the given directory.
- *
- * @todo it might be cute to collapse multiple '/' such as "foo//"
- * concat "//bar"
- *
- * @param dir the directory name
- * @param next_component the filename
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_concat_dir_and_file (DBusString *dir,
- const DBusString *next_component)
-{
- dbus_bool_t dir_ends_in_slash;
- dbus_bool_t file_starts_with_slash;
-
- if (_dbus_string_get_length (dir) == 0 ||
- _dbus_string_get_length (next_component) == 0)
- return TRUE;
-
- dir_ends_in_slash = '/' == _dbus_string_get_byte (dir,
- _dbus_string_get_length (dir) - 1);
-
- file_starts_with_slash = '/' == _dbus_string_get_byte (next_component, 0);
-
- if (dir_ends_in_slash && file_starts_with_slash)
- {
- _dbus_string_shorten (dir, 1);
- }
- else if (!(dir_ends_in_slash || file_starts_with_slash))
- {
- if (!_dbus_string_append_byte (dir, '/'))
- return FALSE;
- }
-
- return _dbus_string_copy (next_component, 0, dir,
- _dbus_string_get_length (dir));
-}
-
-/** nanoseconds in a second */
-#define NANOSECONDS_PER_SECOND 1000000000
-/** microseconds in a second */
-#define MICROSECONDS_PER_SECOND 1000000
-/** milliseconds in a second */
-#define MILLISECONDS_PER_SECOND 1000
-/** nanoseconds in a millisecond */
-#define NANOSECONDS_PER_MILLISECOND 1000000
-/** microseconds in a millisecond */
-#define MICROSECONDS_PER_MILLISECOND 1000
-
-/**
- * Sleeps the given number of milliseconds.
- * @param milliseconds number of milliseconds
- */
-void
-_dbus_sleep_milliseconds (int milliseconds)
-{
-#ifdef HAVE_NANOSLEEP
- struct timespec req;
- struct timespec rem;
-
- req.tv_sec = milliseconds / MILLISECONDS_PER_SECOND;
- req.tv_nsec = (milliseconds % MILLISECONDS_PER_SECOND) * NANOSECONDS_PER_MILLISECOND;
- rem.tv_sec = 0;
- rem.tv_nsec = 0;
-
- while (nanosleep (&req, &rem) < 0 && errno == EINTR)
- req = rem;
-#elif defined (HAVE_USLEEP)
- usleep (milliseconds * MICROSECONDS_PER_MILLISECOND);
-#else /* ! HAVE_USLEEP */
- sleep (MAX (milliseconds / 1000, 1));
-#endif
-}
-
-static dbus_bool_t
-_dbus_generate_pseudorandom_bytes (DBusString *str,
- int n_bytes)
-{
- int old_len;
- char *p;
-
- old_len = _dbus_string_get_length (str);
-
- if (!_dbus_string_lengthen (str, n_bytes))
- return FALSE;
-
- p = _dbus_string_get_data_len (str, old_len, n_bytes);
-
- _dbus_generate_pseudorandom_bytes_buffer (p, n_bytes);
-
- return TRUE;
-}
-
-/**
- * Generates the given number of random bytes,
- * using the best mechanism we can come up with.
- *
- * @param str the string
- * @param n_bytes the number of random bytes to append to string
- * @returns #TRUE on success, #FALSE if no memory
- */
-dbus_bool_t
-_dbus_generate_random_bytes (DBusString *str,
- int n_bytes)
-{
- int old_len;
- int fd;
-
- /* FALSE return means "no memory", if it could
- * mean something else then we'd need to return
- * a DBusError. So we always fall back to pseudorandom
- * if the I/O fails.
- */
-
- old_len = _dbus_string_get_length (str);
- fd = -1;
-
- /* note, urandom on linux will fall back to pseudorandom */
- fd = open ("/dev/urandom", O_RDONLY);
- if (fd < 0)
- return _dbus_generate_pseudorandom_bytes (str, n_bytes);
-
- _dbus_verbose ("/dev/urandom fd %d opened\n", fd);
-
- if (_dbus_read (fd, str, n_bytes) != n_bytes)
- {
- _dbus_close (fd, NULL);
- _dbus_string_set_length (str, old_len);
- return _dbus_generate_pseudorandom_bytes (str, n_bytes);
- }
-
- _dbus_verbose ("Read %d bytes from /dev/urandom\n",
- n_bytes);
-
- _dbus_close (fd, NULL);
-
- return TRUE;
-}
-
-/**
- * Exit the process, returning the given value.
- *
- * @param code the exit code
- */
-void
-_dbus_exit (int code)
-{
- _exit (code);
-}
-
-/**
- * A wrapper around strerror() because some platforms
- * may be lame and not have strerror(). Also, never
- * returns NULL.
- *
- * @param error_number errno.
- * @returns error description.
- */
-const char*
-_dbus_strerror (int error_number)
-{
- const char *msg;
-
- msg = strerror (error_number);
- if (msg == NULL)
- msg = "unknown";
-
- return msg;
-}
-
-/**
- * signal (SIGPIPE, SIG_IGN);
- */
-void
-_dbus_disable_sigpipe (void)
-{
- signal (SIGPIPE, SIG_IGN);
-}
-
-/**
- * Sets the file descriptor to be close
- * on exec. Should be called for all file
- * descriptors in D-Bus code.
- *
- * @param fd the file descriptor
- */
-void
-_dbus_fd_set_close_on_exec (int fd)
-{
- int val;
-
- val = fcntl (fd, F_GETFD, 0);
-
- if (val < 0)
- return;
-
- val |= FD_CLOEXEC;
-
- fcntl (fd, F_SETFD, val);
-}
-
-/**
- * Closes a file descriptor.
- *
- * @param fd the file descriptor
- * @param error error object
- * @returns #FALSE if error set
- */
-dbus_bool_t
-_dbus_close (int fd,
- DBusError *error)
-{
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- again:
- if (close (fd) < 0)
- {
- if (errno == EINTR)
- goto again;
-
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not close fd %d", fd);
- return FALSE;
- }
-
- return TRUE;
-}
-
-/**
- * Sets a file descriptor to be nonblocking.
- *
- * @param fd the file descriptor.
- * @param error address of error location.
- * @returns #TRUE on success.
- */
-dbus_bool_t
-_dbus_set_fd_nonblocking (int fd,
- DBusError *error)
-{
- int val;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- val = fcntl (fd, F_GETFL, 0);
- if (val < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to get flags from file descriptor %d: %s",
- fd, _dbus_strerror (errno));
- _dbus_verbose ("Failed to get flags for fd %d: %s\n", fd,
- _dbus_strerror (errno));
- return FALSE;
- }
-
- if (fcntl (fd, F_SETFL, val | O_NONBLOCK) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to set nonblocking flag of file descriptor %d: %s",
- fd, _dbus_strerror (errno));
- _dbus_verbose ("Failed to set fd %d nonblocking: %s\n",
- fd, _dbus_strerror (errno));
-
- return FALSE;
- }
-
- return TRUE;
-}
-
-/**
- * On GNU libc systems, print a crude backtrace to stderr. On other
- * systems, print "no backtrace support" and block for possible gdb
- * attachment if an appropriate environment variable is set.
- */
-void
-_dbus_print_backtrace (void)
-{
-#if defined (HAVE_BACKTRACE) && defined (DBUS_BUILT_R_DYNAMIC)
- void *bt[500];
- int bt_size;
- int i;
- char **syms;
-
- bt_size = backtrace (bt, 500);
-
- syms = backtrace_symbols (bt, bt_size);
-
- i = 0;
- while (i < bt_size)
- {
- /* don't use dbus_warn since it can _dbus_abort() */
- fprintf (stderr, " %s\n", syms[i]);
- ++i;
- }
- fflush (stderr);
-
- free (syms);
-#elif defined (HAVE_BACKTRACE) && ! defined (DBUS_BUILT_R_DYNAMIC)
- fprintf (stderr, " D-Bus not built with -rdynamic so unable to print a backtrace\n");
-#else
- fprintf (stderr, " D-Bus not compiled with backtrace support so unable to print a backtrace\n");
-#endif
-}
-
-/**
- * Creates a full-duplex pipe (as in socketpair()).
- * Sets both ends of the pipe nonblocking.
- *
- * @todo libdbus only uses this for the debug-pipe server, so in
- * principle it could be in dbus-sysdeps-util.c, except that
- * dbus-sysdeps-util.c isn't in libdbus when tests are enabled and the
- * debug-pipe server is used.
- *
- * @param fd1 return location for one end
- * @param fd2 return location for the other end
- * @param blocking #TRUE if pipe should be blocking
- * @param error error return
- * @returns #FALSE on failure (if error is set)
- */
-dbus_bool_t
-_dbus_full_duplex_pipe (int *fd1,
- int *fd2,
- dbus_bool_t blocking,
- DBusError *error)
-{
-#ifdef HAVE_SOCKETPAIR
- int fds[2];
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
- if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not create full-duplex pipe");
- return FALSE;
- }
-
- if (!blocking &&
- (!_dbus_set_fd_nonblocking (fds[0], NULL) ||
- !_dbus_set_fd_nonblocking (fds[1], NULL)))
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Could not set full-duplex pipe nonblocking");
-
- _dbus_close (fds[0], NULL);
- _dbus_close (fds[1], NULL);
-
- return FALSE;
- }
-
- *fd1 = fds[0];
- *fd2 = fds[1];
-
- _dbus_verbose ("full-duplex pipe %d <-> %d\n",
- *fd1, *fd2);
-
- return TRUE;
-#else
- _dbus_warn ("_dbus_full_duplex_pipe() not implemented on this OS\n");
- dbus_set_error (error, DBUS_ERROR_FAILED,
- "_dbus_full_duplex_pipe() not implemented on this OS");
- return FALSE;
-#endif
-}
-
-/**
- * Measure the length of the given format string and arguments,
- * not including the terminating nul.
- *
- * @param format a printf-style format string
- * @param args arguments for the format string
- * @returns length of the given format string and args
- */
-int
-_dbus_printf_string_upper_bound (const char *format,
- va_list args)
-{
- char c;
- return vsnprintf (&c, 1, format, args);
-}
-
-/**
- * Gets the temporary files directory by inspecting the environment variables
- * TMPDIR, TMP, and TEMP in that order. If none of those are set "/tmp" is returned
- *
- * @returns location of temp directory
- */
-const char*
-_dbus_get_tmpdir(void)
-{
- static const char* tmpdir = NULL;
-
- if (tmpdir == NULL)
- {
- /* TMPDIR is what glibc uses, then
- * glibc falls back to the P_tmpdir macro which
- * just expands to "/tmp"
- */
- if (tmpdir == NULL)
- tmpdir = getenv("TMPDIR");
-
- /* These two env variables are probably
- * broken, but maybe some OS uses them?
- */
- if (tmpdir == NULL)
- tmpdir = getenv("TMP");
- if (tmpdir == NULL)
- tmpdir = getenv("TEMP");
-
- /* And this is the sane fallback. */
- if (tmpdir == NULL)
- tmpdir = "/tmp";
- }
-
- _dbus_assert(tmpdir != NULL);
-
- return tmpdir;
-}
-
-/**
- * Determines the address of the session bus by querying a
- * platform-specific method.
- *
- * If successful, returns #TRUE and appends the address to @p
- * address. If a failure happens, returns #FALSE and
- * sets an error in @p error.
- *
- * @param address a DBusString where the address can be stored
- * @param error a DBusError to store the error in case of failure
- * @returns #TRUE on success, #FALSE if an error happened
- */
-dbus_bool_t
-_dbus_get_autolaunch_address (DBusString *address,
- DBusError *error)
-{
- static char *argv[6];
- int address_pipe[2] = { -1, -1 };
- int errors_pipe[2] = { -1, -1 };
- pid_t pid;
- int ret;
- int status;
- int orig_len;
- int i;
- DBusString uuid;
- dbus_bool_t retval;
-
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
- retval = FALSE;
-
- if (!_dbus_string_init (&uuid))
- {
- _DBUS_SET_OOM (error);
- return FALSE;
- }
-
- if (!_dbus_get_local_machine_uuid_encoded (&uuid))
- {
- _DBUS_SET_OOM (error);
- goto out;
- }
-
- i = 0;
- argv[i] = "dbus-launch";
- ++i;
- argv[i] = "--autolaunch";
- ++i;
- argv[i] = _dbus_string_get_data (&uuid);
- ++i;
- argv[i] = "--binary-syntax";
- ++i;
- argv[i] = "--close-stderr";
- ++i;
- argv[i] = NULL;
- ++i;
-
- _dbus_assert (i == _DBUS_N_ELEMENTS (argv));
-
- orig_len = _dbus_string_get_length (address);
-
-#define READ_END 0
-#define WRITE_END 1
- if (pipe (address_pipe) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to create a pipe: %s",
- _dbus_strerror (errno));
- _dbus_verbose ("Failed to create a pipe to call dbus-launch: %s\n",
- _dbus_strerror (errno));
- goto out;
- }
- if (pipe (errors_pipe) < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to create a pipe: %s",
- _dbus_strerror (errno));
- _dbus_verbose ("Failed to create a pipe to call dbus-launch: %s\n",
- _dbus_strerror (errno));
- goto out;
- }
-
- pid = fork ();
- if (pid < 0)
- {
- dbus_set_error (error, _dbus_error_from_errno (errno),
- "Failed to fork(): %s",
- _dbus_strerror (errno));
- _dbus_verbose ("Failed to fork() to call dbus-launch: %s\n",
- _dbus_strerror (errno));
- goto out;
- }
-
- if (pid == 0)
- {
- /* child process */
- int maxfds;
- int fd;
-
- fd = open ("/dev/null", O_RDWR);
- if (fd == -1)
- /* huh?! can't open /dev/null? */
- _exit (1);
-
- _dbus_verbose ("/dev/null fd %d opened\n", fd);
-
- /* set-up stdXXX */
- close (address_pipe[READ_END]);
- close (errors_pipe[READ_END]);
- close (0); /* close stdin */
- close (1); /* close stdout */
- close (2); /* close stderr */
-
- if (dup2 (fd, 0) == -1)
- _exit (1);
- if (dup2 (address_pipe[WRITE_END], 1) == -1)
- _exit (1);
- if (dup2 (errors_pipe[WRITE_END], 2) == -1)
- _exit (1);
-
- maxfds = sysconf (_SC_OPEN_MAX);
- /* Pick something reasonable if for some reason sysconf
- * says unlimited.
- */
- if (maxfds < 0)
- maxfds = 1024;
- /* close all inherited fds */
- for (i = 3; i < maxfds; i++)
- close (i);
-
- execv (DBUS_BINDIR "/dbus-launch", argv);
-
- /* failed, try searching PATH */
- execvp ("dbus-launch", argv);
-
- /* still nothing, we failed */
- _exit (1);
- }
-
- /* parent process */
- close (address_pipe[WRITE_END]);
- close (errors_pipe[WRITE_END]);
- address_pipe[WRITE_END] = -1;
- errors_pipe[WRITE_END] = -1;
-
- ret = 0;
- do
- {
- ret = _dbus_read (address_pipe[READ_END], address, 1024);
- }
- while (ret > 0);
-
- /* reap the child process to avoid it lingering as zombie */
- do
- {
- ret = waitpid (pid, &status, 0);
- }
- while (ret == -1 && errno == EINTR);
-
- /* We succeeded if the process exited with status 0 and
- anything was read */
- if (!WIFEXITED (status) || WEXITSTATUS (status) != 0 ||
- _dbus_string_get_length (address) == orig_len)
- {
- /* The process ended with error */
- DBusString error_message;
- _dbus_string_init (&error_message);
- ret = 0;
- do
- {
- ret = _dbus_read (errors_pipe[READ_END], &error_message, 1024);
- }
- while (ret > 0);
-
- _dbus_string_set_length (address, orig_len);
- if (_dbus_string_get_length (&error_message) > 0)
- dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
- "dbus-launch failed to autolaunch D-Bus session: %s",
- _dbus_string_get_data (&error_message));
- else
- dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
- "Failed to execute dbus-launch to autolaunch D-Bus session");
- goto out;
- }
-
- retval = TRUE;
-
- out:
- if (retval)
- _DBUS_ASSERT_ERROR_IS_CLEAR (error);
- else
- _DBUS_ASSERT_ERROR_IS_SET (error);
-
- if (address_pipe[0] != -1)
- close (address_pipe[0]);
- if (address_pipe[1] != -1)
- close (address_pipe[1]);
- if (errors_pipe[0] != -1)
- close (errors_pipe[0]);
- if (errors_pipe[1] != -1)
- close (errors_pipe[1]);
-
- _dbus_string_free (&uuid);
- return retval;
-}
-
-/**
- * Reads the uuid of the machine we're running on from
- * the dbus configuration. Optionally try to create it
- * (only root can do this usually).
- *
- * On UNIX, reads a file that gets created by dbus-uuidgen
- * in a post-install script. On Windows, if there's a standard
- * machine uuid we could just use that, but I can't find one
- * with the right properties (the hardware profile guid can change
- * without rebooting I believe). If there's no standard one
- * we might want to use the registry instead of a file for
- * this, and I'm not sure how we'd ensure the uuid gets created.
- *
- * @param machine_id guid to init with the machine's uuid
- * @param create_if_not_found try to create the uuid if it doesn't exist
- * @param error the error return
- * @returns #FALSE if the error is set
- */
-dbus_bool_t
-_dbus_read_local_machine_uuid (DBusGUID *machine_id,
- dbus_bool_t create_if_not_found,
- DBusError *error)
-{
- DBusString filename;
- _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
- return _dbus_read_uuid_file (&filename, machine_id, create_if_not_found, error);
-}
-
-#define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"
-#define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"
-
-
-/**
- * Returns the standard directories for a session bus to look for service
- * activation files
- *
- * On UNIX this should be the standard xdg freedesktop.org data directories:
- *
- * XDG_DATA_HOME=${XDG_DATA_HOME-$HOME/.local/share}
- * XDG_DATA_DIRS=${XDG_DATA_DIRS-/usr/local/share:/usr/share}
- *
- * and
- *
- * DBUS_DATADIR
- *
- * @param dirs the directory list we are returning
- * @returns #FALSE on OOM
- */
-
-dbus_bool_t
-_dbus_get_standard_session_servicedirs (DBusList **dirs)
-{
- const char *xdg_data_home;
- const char *xdg_data_dirs;
- DBusString servicedir_path;
-
- if (!_dbus_string_init (&servicedir_path))
- return FALSE;
-
- xdg_data_home = _dbus_getenv ("XDG_DATA_HOME");
- xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
-
- if (xdg_data_dirs != NULL)
- {
- if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
- goto oom;
-
- if (!_dbus_string_append (&servicedir_path, ":"))
- goto oom;
- }
- else
- {
- if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
- goto oom;
- }
-
- /*
- * add configured datadir to defaults
- * this may be the same as an xdg dir
- * however the config parser should take
- * care of duplicates
- */
- if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR":"))
- goto oom;
-
- if (xdg_data_home != NULL)
- {
- if (!_dbus_string_append (&servicedir_path, xdg_data_home))
- goto oom;
- }
- else
- {
- const DBusString *homedir;
- DBusString local_share;
-
- if (!_dbus_homedir_from_current_process (&homedir))
- goto oom;
-
- if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir)))
- goto oom;
-
- _dbus_string_init_const (&local_share, "/.local/share");
- if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share))
- goto oom;
- }
-
- if (!_dbus_split_paths_and_append (&servicedir_path,
- DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
- dirs))
- goto oom;
-
- _dbus_string_free (&servicedir_path);
- return TRUE;
-
- oom:
- _dbus_string_free (&servicedir_path);
- return FALSE;
-}
-
-
-/**
- * Returns the standard directories for a system bus to look for service
- * activation files
- *
- * On UNIX this should be the standard xdg freedesktop.org data directories:
- *
- * XDG_DATA_DIRS=${XDG_DATA_DIRS-/usr/local/share:/usr/share}
- *
- * and
- *
- * DBUS_DATADIR
- *
- * On Windows there is no system bus and this function can return nothing.
- *
- * @param dirs the directory list we are returning
- * @returns #FALSE on OOM
- */
-
-dbus_bool_t
-_dbus_get_standard_system_servicedirs (DBusList **dirs)
-{
- const char *xdg_data_dirs;
- DBusString servicedir_path;
-
- if (!_dbus_string_init (&servicedir_path))
- return FALSE;
-
- xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
-
- if (xdg_data_dirs != NULL)
- {
- if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
- goto oom;
-
- if (!_dbus_string_append (&servicedir_path, ":"))
- goto oom;
- }
- else
- {
- if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
- goto oom;
- }
-
- /*
- * add configured datadir to defaults
- * this may be the same as an xdg dir
- * however the config parser should take
- * care of duplicates
- */
- if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR":"))
- goto oom;
-
- if (!_dbus_split_paths_and_append (&servicedir_path,
- DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
- dirs))
- goto oom;
-
- _dbus_string_free (&servicedir_path);
- return TRUE;
-
- oom:
- _dbus_string_free (&servicedir_path);
- return FALSE;
-}
-
-/**
- * Append the absolute path of the system.conf file
- * (there is no system bus on Windows so this can just
- * return FALSE and print a warning or something)
- *
- * @param str the string to append to
- * @returns #FALSE if no memory
- */
-dbus_bool_t
-_dbus_append_system_config_file (DBusString *str)
-{
- return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
-}
-
-/**
- * Append the absolute path of the session.conf file.
- *
- * @param str the string to append to
- * @returns #FALSE if no memory
- */
-dbus_bool_t
-_dbus_append_session_config_file (DBusString *str)
-{
- return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
-}
-
-/**
- * Called when the bus daemon is signaled to reload its configuration; any
- * caches should be nuked. Of course any caches that need explicit reload
- * are probably broken, but c'est la vie.
- *
- *
- */
-void
-_dbus_flush_caches (void)
-{
- _dbus_user_database_flush_system ();
-}
-
-/**
- * Appends the directory in which a keyring for the given credentials
- * should be stored. The credentials should have either a Windows or
- * UNIX user in them. The directory should be an absolute path.
- *
- * On UNIX the directory is ~/.dbus-keyrings while on Windows it should probably
- * be something else, since the dotfile convention is not normal on Windows.
- *
- * @param directory string to append directory to
- * @param credentials credentials the directory should be for
- *
- * @returns #FALSE on no memory
- */
-dbus_bool_t
-_dbus_append_keyring_directory_for_credentials (DBusString *directory,
- DBusCredentials *credentials)
-{
- DBusString homedir;
- DBusString dotdir;
- dbus_uid_t uid;
-
- _dbus_assert (credentials != NULL);
- _dbus_assert (!_dbus_credentials_are_anonymous (credentials));
-
- if (!_dbus_string_init (&homedir))
- return FALSE;
-
- uid = _dbus_credentials_get_unix_uid (credentials);
- _dbus_assert (uid != DBUS_UID_UNSET);
-
- if (!_dbus_homedir_from_uid (uid, &homedir))
- goto failed;
-
-#ifdef DBUS_BUILD_TESTS
- {
- const char *override;
-
- override = _dbus_getenv ("DBUS_TEST_HOMEDIR");
- if (override != NULL && *override != '\0')
- {
- _dbus_string_set_length (&homedir, 0);
- if (!_dbus_string_append (&homedir, override))
- goto failed;
-
- _dbus_verbose ("Using fake homedir for testing: %s\n",
- _dbus_string_get_const_data (&homedir));
- }
- else
- {
- static dbus_bool_t already_warned = FALSE;
- if (!already_warned)
- {
- _dbus_warn ("Using your real home directory for testing, set DBUS_TEST_HOMEDIR to avoid\n");
- already_warned = TRUE;
- }
- }
- }
-#endif
-
- _dbus_string_init_const (&dotdir, ".dbus-keyrings");
- if (!_dbus_concat_dir_and_file (&homedir,
- &dotdir))
- goto failed;
-
- if (!_dbus_string_copy (&homedir, 0,
- directory, _dbus_string_get_length (directory))) {
- goto failed;
- }
-
- _dbus_string_free (&homedir);
- return TRUE;
-
- failed:
- _dbus_string_free (&homedir);
- return FALSE;
-}
-
-
-/**
- * See if errno is EAGAIN or EWOULDBLOCK (this has to be done differently
- * for Winsock so is abstracted)
- *
- * @returns #TRUE if errno == EAGAIN or errno == EWOULDBLOCK
- */
-dbus_bool_t
-_dbus_get_is_errno_eagain_or_ewouldblock (void)
-{
- return errno == EAGAIN || errno == EWOULDBLOCK;
-}
-
-/* tests in dbus-sysdeps-util.c */
projects / monky / blobdiff