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|
/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-sysdeps.c Wrappers around system/libc features (internal to D-Bus implementation)
*
* Copyright (C) 2002, 2003 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
*
*/
#include "dbus-internals.h"
#include "dbus-sysdeps.h"
#include "dbus-threads.h"
#include "dbus-protocol.h"
#include "dbus-string.h"
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.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_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
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef HAVE_SOCKLEN_T
#define socklen_t int
#endif
/**
* @addtogroup DBusInternalsUtils
* @{
*/
#ifndef DBUS_DISABLE_ASSERT
/**
* Aborts the program with SIGABRT (dumping core).
*/
void
_dbus_abort (void)
{
#ifdef DBUS_ENABLE_VERBOSE_MODE
const char *s;
s = _dbus_getenv ("DBUS_PRINT_BACKTRACE");
if (s && *s)
_dbus_print_backtrace ();
#endif
abort ();
_exit (1); /* in case someone manages to ignore SIGABRT */
}
#endif
/**
* Wrapper for setenv(). If the value is #NULL, unsets
* the environment variable.
*
* @todo if someone can verify it's safe, we could avoid the
* memleak when doing an unset.
*
* @param varname name of environment variable
* @param value value of environment variable
* @returns #TRUE on success.
*/
dbus_bool_t
_dbus_setenv (const char *varname,
const char *value)
{
_dbus_assert (varname != NULL);
if (value == NULL)
{
#ifdef HAVE_UNSETENV
unsetenv (varname);
return TRUE;
#else
char *putenv_value;
size_t len;
len = strlen (varname);
/* Use system malloc to avoid memleaks that dbus_malloc
* will get upset about.
*/
putenv_value = malloc (len + 1);
if (putenv_value == NULL)
return FALSE;
strcpy (putenv_value, varname);
return (putenv (putenv_value) == 0);
#endif
}
else
{
#ifdef HAVE_SETENV
return (setenv (varname, value, TRUE) == 0);
#else
char *putenv_value;
size_t len;
size_t varname_len;
size_t value_len;
varname_len = strlen (varname);
value_len = strlen (value);
len = varname_len + value_len + 1 /* '=' */ ;
/* Use system malloc to avoid memleaks that dbus_malloc
* will get upset about.
*/
putenv_value = malloc (len + 1);
if (putenv_value == NULL)
return FALSE;
strcpy (putenv_value, varname);
strcpy (putenv_value + varname_len, "=");
strcpy (putenv_value + varname_len + 1, value);
return (putenv (putenv_value) == 0);
#endif
}
}
/**
* Wrapper for getenv().
*
* @param varname name of environment variable
* @returns value of environment variable or #NULL if unset
*/
const char*
_dbus_getenv (const char *varname)
{
return getenv (varname);
}
/**
* 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. _dbus_read() can
* return ENOMEM, even though regular UNIX read doesn't.
*
* @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);
fd = socket (PF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
{
dbus_set_error (error,
_dbus_error_from_errno (errno),
"Failed to create socket: %s",
_dbus_strerror (errno));
return -1;
}
_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");
close (fd);
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");
close (fd);
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");
close (fd);
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));
close (fd);
fd = -1;
return -1;
}
if (!_dbus_set_fd_nonblocking (fd, error))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
close (fd);
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.
*
* 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);
listen_fd = socket (PF_UNIX, SOCK_STREAM, 0);
if (listen_fd < 0)
{
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to create socket \"%s\": %s",
path, _dbus_strerror (errno));
return -1;
}
_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");
close (listen_fd);
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");
close (listen_fd);
return -1;
#endif /* ! HAVE_ABSTRACT_SOCKETS */
}
else
{
/* FIXME 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");
close (listen_fd);
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));
close (listen_fd);
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));
close (listen_fd);
return -1;
}
if (!_dbus_set_fd_nonblocking (listen_fd, error))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
close (listen_fd);
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 prot to connect to
* @param error return location for error code
* @returns connection file descriptor or -1 on error
*/
int
_dbus_connect_tcp_socket (const char *host,
dbus_uint32_t port,
DBusError *error)
{
int fd;
struct sockaddr_in addr;
struct hostent *he;
struct in_addr *haddr;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
{
dbus_set_error (error,
_dbus_error_from_errno (errno),
"Failed to create socket: %s",
_dbus_strerror (errno));
return -1;
}
if (host == NULL)
host = "localhost";
he = gethostbyname (host);
if (he == NULL)
{
dbus_set_error (error,
_dbus_error_from_errno (errno),
"Failed to lookup hostname: %s",
host);
close (fd);
return -1;
}
haddr = ((struct in_addr *) (he->h_addr_list)[0]);
_DBUS_ZERO (addr);
memcpy (&addr.sin_addr, haddr, sizeof(struct in_addr));
addr.sin_family = AF_INET;
addr.sin_port = htons (port);
if (connect (fd, (struct sockaddr*) &addr, sizeof (addr)) < 0)
{
dbus_set_error (error,
_dbus_error_from_errno (errno),
"Failed to connect to socket %s:%d %s",
host, port, _dbus_strerror (errno));
close (fd);
fd = -1;
return -1;
}
if (!_dbus_set_fd_nonblocking (fd, error))
{
close (fd);
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.
*
* @param host the host name to listen on
* @param port the prot to listen on
* @param error return location for errors
* @returns the listening file descriptor or -1 on error
*/
int
_dbus_listen_tcp_socket (const char *host,
dbus_uint32_t port,
DBusError *error)
{
int listen_fd;
struct sockaddr_in addr;
struct hostent *he;
struct in_addr *haddr;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
listen_fd = socket (AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
{
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to create socket \"%s:%d\": %s",
host, port, _dbus_strerror (errno));
return -1;
}
he = gethostbyname (host);
if (he == NULL)
{
dbus_set_error (error,
_dbus_error_from_errno (errno),
"Failed to lookup hostname: %s",
host);
close (listen_fd);
return -1;
}
haddr = ((struct in_addr *) (he->h_addr_list)[0]);
_DBUS_ZERO (addr);
memcpy (&addr.sin_addr, haddr, sizeof (struct in_addr));
addr.sin_family = AF_INET;
addr.sin_port = htons (port);
if (bind (listen_fd, (struct sockaddr*) &addr, sizeof (struct sockaddr)))
{
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to bind socket \"%s:%d\": %s",
host, port, _dbus_strerror (errno));
close (listen_fd);
return -1;
}
if (listen (listen_fd, 30 /* backlog */) < 0)
{
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to listen on socket \"%s:%d\": %s",
host, port, _dbus_strerror (errno));
close (listen_fd);
return -1;
}
if (!_dbus_set_fd_nonblocking (listen_fd, error))
{
close (listen_fd);
return -1;
}
return listen_fd;
}
static dbus_bool_t
write_credentials_byte (int server_fd,
DBusError *error)
{
int bytes_written;
char buf[1] = { '\0' };
#if defined(HAVE_CMSGCRED) && !defined(LOCAL_CREDS)
struct {
struct cmsghdr hdr;
struct cmsgcred cred;
} cmsg;
struct iovec iov;
struct msghdr msg;
#endif
#if defined(HAVE_CMSGCRED) && !defined(LOCAL_CREDS)
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) && !defined(LOCAL_CREDS)
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. Fills in pid/uid/gid with
* -1 if no credentials are available. 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 struct to fill with credentials of client
* @param error location to store error code
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_read_credentials_unix_socket (int client_fd,
DBusCredentials *credentials,
DBusError *error)
{
struct msghdr msg;
struct iovec iov;
char buf;
#ifdef HAVE_CMSGCRED
struct {
struct cmsghdr hdr;
struct cmsgcred 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 (credentials->pid));
_dbus_assert (sizeof (uid_t) <= sizeof (credentials->uid));
_dbus_assert (sizeof (gid_t) <= sizeof (credentials->gid));
_dbus_credentials_clear (credentials);
#if defined(LOCAL_CREDS) && defined(HAVE_CMSGCRED)
/* Set the socket to receive credentials on the next message */
{
int on = 1;
if (setsockopt (client_fd, 0, LOCAL_CREDS, &on, sizeof (on)) < 0)
{
_dbus_verbose ("Unable to set LOCAL_CREDS socket option\n");
return FALSE;
}
}
#endif
iov.iov_base = &buf;
iov.iov_len = 1;
memset (&msg, 0, sizeof (msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
#ifdef HAVE_CMSGCRED
memset (&cmsg, 0, sizeof (cmsg));
msg.msg_control = &cmsg;
msg.msg_controllen = sizeof (cmsg);
#endif
again:
if (recvmsg (client_fd, &msg, 0) < 0)
{
if (errno == EINTR)
goto again;
dbus_set_error (error, _dbus_error_from_errno (errno),
"Failed to read credentials byte: %s",
_dbus_strerror (errno));
return FALSE;
}
if (buf != '\0')
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Credentials byte was not nul");
return FALSE;
}
#ifdef HAVE_CMSGCRED
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))
{
credentials->pid = cr.pid;
credentials->uid = cr.uid;
credentials->gid = cr.gid;
}
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)
credentials->pid = cmsg.cred.cmcred_pid;
credentials->uid = cmsg.cred.cmcred_euid;
credentials->gid = cmsg.cred.cmcred_groups[0];
#elif defined(HAVE_GETPEEREID)
uid_t euid;
gid_t egid;
if (getpeereid (client_fd, &euid, &egid) == 0)
{
credentials->uid = euid;
credentials->gid = egid;
}
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)
{
credentials->pid = ucred_getpid (ucred);
credentials->uid = ucred_geteuid (ucred);
credentials->gid = ucred_getegid (ucred);
}
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
" gid "DBUS_GID_FORMAT"\n",
credentials->pid,
credentials->uid,
credentials->gid);
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_unix_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;
}
return client_fd;
}
/** @} */
/**
* @addtogroup DBusString
*
* @{
*/
/**
* Appends an integer to a DBusString.
*
* @param str the string
* @param value the integer value
* @returns #FALSE if not enough memory or other failure.
*/
dbus_bool_t
_dbus_string_append_int (DBusString *str,
long value)
{
/* this calculation is from comp.lang.c faq */
#define MAX_LONG_LEN ((sizeof (long) * 8 + 2) / 3 + 1) /* +1 for '-' */
int orig_len;
int i;
char *buf;
orig_len = _dbus_string_get_length (str);
if (!_dbus_string_lengthen (str, MAX_LONG_LEN))
return FALSE;
buf = _dbus_string_get_data_len (str, orig_len, MAX_LONG_LEN);
snprintf (buf, MAX_LONG_LEN, "%ld", value);
i = 0;
while (*buf)
{
++buf;
++i;
}
_dbus_string_shorten (str, MAX_LONG_LEN - i);
return TRUE;
}
/**
* Appends an unsigned integer to a DBusString.
*
* @param str the string
* @param value the integer value
* @returns #FALSE if not enough memory or other failure.
*/
dbus_bool_t
_dbus_string_append_uint (DBusString *str,
unsigned long value)
{
/* this is wrong, but definitely on the high side. */
#define MAX_ULONG_LEN (MAX_LONG_LEN * 2)
int orig_len;
int i;
char *buf;
orig_len = _dbus_string_get_length (str);
if (!_dbus_string_lengthen (str, MAX_ULONG_LEN))
return FALSE;
buf = _dbus_string_get_data_len (str, orig_len, MAX_ULONG_LEN);
snprintf (buf, MAX_ULONG_LEN, "%lu", value);
i = 0;
while (*buf)
{
++buf;
++i;
}
_dbus_string_shorten (str, MAX_ULONG_LEN - i);
return TRUE;
}
#ifdef DBUS_BUILD_TESTS
/**
* Appends a double to a DBusString.
*
* @param str the string
* @param value the floating point value
* @returns #FALSE if not enough memory or other failure.
*/
dbus_bool_t
_dbus_string_append_double (DBusString *str,
double value)
{
#define MAX_DOUBLE_LEN 64 /* this is completely made up :-/ */
int orig_len;
char *buf;
int i;
orig_len = _dbus_string_get_length (str);
if (!_dbus_string_lengthen (str, MAX_DOUBLE_LEN))
return FALSE;
buf = _dbus_string_get_data_len (str, orig_len, MAX_DOUBLE_LEN);
snprintf (buf, MAX_LONG_LEN, "%g", value);
i = 0;
while (*buf)
{
++buf;
++i;
}
_dbus_string_shorten (str, MAX_DOUBLE_LEN - i);
return TRUE;
}
#endif /* DBUS_BUILD_TESTS */
/**
* Parses an integer contained in a DBusString. Either return parameter
* may be #NULL if you aren't interested in it. The integer is parsed
* and stored in value_return. Return parameters are not initialized
* if the function returns #FALSE.
*
* @param str the string
* @param start the byte index of the start of the integer
* @param value_return return location of the integer value or #NULL
* @param end_return return location of the end of the integer, or #NULL
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_string_parse_int (const DBusString *str,
int start,
long *value_return,
int *end_return)
{
long v;
const char *p;
char *end;
p = _dbus_string_get_const_data_len (str, start,
_dbus_string_get_length (str) - start);
end = NULL;
errno = 0;
v = strtol (p, &end, 0);
if (end == NULL || end == p || errno != 0)
return FALSE;
if (value_return)
*value_return = v;
if (end_return)
*end_return = start + (end - p);
return TRUE;
}
/**
* 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;
}
/**
* Parses an unsigned integer contained in a DBusString. Either return
* parameter may be #NULL if you aren't interested in it. The integer
* is parsed and stored in value_return. Return parameters are not
* initialized if the function returns #FALSE.
*
* @param str the string
* @param start the byte index of the start of the integer
* @param value_return return location of the integer value or #NULL
* @param end_return return location of the end of the integer, or #NULL
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_string_parse_uint (const DBusString *str,
int start,
unsigned long *value_return,
int *end_return)
{
unsigned long v;
const char *p;
char *end;
p = _dbus_string_get_const_data_len (str, start,
_dbus_string_get_length (str) - start);
end = NULL;
errno = 0;
v = strtoul (p, &end, 0);
if (end == NULL || end == p || errno != 0)
return FALSE;
if (value_return)
*value_return = v;
if (end_return)
*end_return = start + (end - p);
return TRUE;
}
#ifdef DBUS_BUILD_TESTS
static dbus_bool_t
ascii_isspace (char c)
{
return (c == ' ' ||
c == '\f' ||
c == '\n' ||
c == '\r' ||
c == '\t' ||
c == '\v');
}
#endif /* DBUS_BUILD_TESTS */
#ifdef DBUS_BUILD_TESTS
static dbus_bool_t
ascii_isdigit (char c)
{
return c >= '0' && c <= '9';
}
#endif /* DBUS_BUILD_TESTS */
#ifdef DBUS_BUILD_TESTS
static dbus_bool_t
ascii_isxdigit (char c)
{
return (ascii_isdigit (c) ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F'));
}
#endif /* DBUS_BUILD_TESTS */
#ifdef DBUS_BUILD_TESTS
/* Calls strtod in a locale-independent fashion, by looking at
* the locale data and patching the decimal comma to a point.
*
* Relicensed from glib.
*/
static double
ascii_strtod (const char *nptr,
char **endptr)
{
char *fail_pos;
double val;
struct lconv *locale_data;
const char *decimal_point;
int decimal_point_len;
const char *p, *decimal_point_pos;
const char *end = NULL; /* Silence gcc */
fail_pos = NULL;
locale_data = localeconv ();
decimal_point = locale_data->decimal_point;
decimal_point_len = strlen (decimal_point);
_dbus_assert (decimal_point_len != 0);
decimal_point_pos = NULL;
if (decimal_point[0] != '.' ||
decimal_point[1] != 0)
{
p = nptr;
/* Skip leading space */
while (ascii_isspace (*p))
p++;
/* Skip leading optional sign */
if (*p == '+' || *p == '-')
p++;
if (p[0] == '0' &&
(p[1] == 'x' || p[1] == 'X'))
{
p += 2;
/* HEX - find the (optional) decimal point */
while (ascii_isxdigit (*p))
p++;
if (*p == '.')
{
decimal_point_pos = p++;
while (ascii_isxdigit (*p))
p++;
if (*p == 'p' || *p == 'P')
p++;
if (*p == '+' || *p == '-')
p++;
while (ascii_isdigit (*p))
p++;
end = p;
}
}
else
{
while (ascii_isdigit (*p))
p++;
if (*p == '.')
{
decimal_point_pos = p++;
while (ascii_isdigit (*p))
p++;
if (*p == 'e' || *p == 'E')
p++;
if (*p == '+' || *p == '-')
p++;
while (ascii_isdigit (*p))
p++;
end = p;
}
}
/* For the other cases, we need not convert the decimal point */
}
/* Set errno to zero, so that we can distinguish zero results
and underflows */
errno = 0;
if (decimal_point_pos)
{
char *copy, *c;
/* We need to convert the '.' to the locale specific decimal point */
copy = dbus_malloc (end - nptr + 1 + decimal_point_len);
c = copy;
memcpy (c, nptr, decimal_point_pos - nptr);
c += decimal_point_pos - nptr;
memcpy (c, decimal_point, decimal_point_len);
c += decimal_point_len;
memcpy (c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
c += end - (decimal_point_pos + 1);
*c = 0;
val = strtod (copy, &fail_pos);
if (fail_pos)
{
if (fail_pos > decimal_point_pos)
fail_pos = (char *)nptr + (fail_pos - copy) - (decimal_point_len - 1);
else
fail_pos = (char *)nptr + (fail_pos - copy);
}
dbus_free (copy);
}
else
val = strtod (nptr, &fail_pos);
if (endptr)
*endptr = fail_pos;
return val;
}
#endif /* DBUS_BUILD_TESTS */
#ifdef DBUS_BUILD_TESTS
/**
* Parses a floating point number contained in a DBusString. Either
* return parameter may be #NULL if you aren't interested in it. The
* integer is parsed and stored in value_return. Return parameters are
* not initialized if the function returns #FALSE.
*
* @param str the string
* @param start the byte index of the start of the float
* @param value_return return location of the float value or #NULL
* @param end_return return location of the end of the float, or #NULL
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_string_parse_double (const DBusString *str,
int start,
double *value_return,
int *end_return)
{
double v;
const char *p;
char *end;
p = _dbus_string_get_const_data_len (str, start,
_dbus_string_get_length (str) - start);
end = NULL;
errno = 0;
v = ascii_strtod (p, &end);
if (end == NULL || end == p || errno != 0)
return FALSE;
if (value_return)
*value_return = v;
if (end_return)
*end_return = start + (end - p);
return TRUE;
}
#endif /* DBUS_BUILD_TESTS */
/** @} */ /* DBusString group */
/**
* @addtogroup DBusInternalsUtils
* @{
*/
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;
char buf[1024];
struct passwd p_str;
p = NULL;
#ifdef HAVE_POSIX_GETPWNAM_R
if (uid != DBUS_UID_UNSET)
result = getpwuid_r (uid, &p_str, buf, sizeof (buf),
&p);
else
result = getpwnam_r (username_c, &p_str, buf, sizeof (buf),
&p);
#else
if (uid != DBUS_UID_UNSET)
p = getpwuid_r (uid, &p_str, buf, sizeof (buf));
else
p = getpwnam_r (username_c, &p_str, buf, sizeof (buf));
result = 0;
#endif /* !HAVE_POSIX_GETPWNAM_R */
if (result == 0 && p == &p_str)
{
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;
}
}
#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);
}
/**
* Frees the members of info
* (but not info itself)
* @param info the user info struct
*/
void
_dbus_user_info_free (DBusUserInfo *info)
{
dbus_free (info->group_ids);
dbus_free (info->username);
dbus_free (info->homedir);
}
/**
* Frees the members of info (but not info itself).
*
* @param info the group info
*/
void
_dbus_group_info_free (DBusGroupInfo *info)
{
dbus_free (info->groupname);
}
/**
* Sets fields in DBusCredentials to DBUS_PID_UNSET,
* DBUS_UID_UNSET, DBUS_GID_UNSET.
*
* @param credentials the credentials object to fill in
*/
void
_dbus_credentials_clear (DBusCredentials *credentials)
{
credentials->pid = DBUS_PID_UNSET;
credentials->uid = DBUS_UID_UNSET;
credentials->gid = DBUS_GID_UNSET;
}
/**
* Gets the credentials of the current process.
*
* @param credentials credentials to fill in.
*/
void
_dbus_credentials_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 (credentials->pid));
_dbus_assert (sizeof (uid_t) <= sizeof (credentials->uid));
_dbus_assert (sizeof (gid_t) <= sizeof (credentials->gid));
credentials->pid = getpid ();
credentials->uid = getuid ();
credentials->gid = getgid ();
}
/**
* Checks whether the provided_credentials are allowed to log in
* as the expected_credentials.
*
* @param expected_credentials credentials we're trying to log in as
* @param provided_credentials credentials we have
* @returns #TRUE if we can log in
*/
dbus_bool_t
_dbus_credentials_match (const DBusCredentials *expected_credentials,
const DBusCredentials *provided_credentials)
{
if (provided_credentials->uid == DBUS_UID_UNSET)
return FALSE;
else if (expected_credentials->uid == DBUS_UID_UNSET)
return FALSE;
else if (provided_credentials->uid == 0)
return TRUE;
else if (provided_credentials->uid == expected_credentials->uid)
return TRUE;
else
return FALSE;
}
/**
* Gets our process ID
* @returns process ID
*/
unsigned long
_dbus_getpid (void)
{
return getpid ();
}
/** Gets our UID
* @returns process UID
*/
dbus_uid_t
_dbus_getuid (void)
{
return getuid ();
}
#ifdef DBUS_BUILD_TESTS
/** Gets our GID
* @returns process GID
*/
dbus_gid_t
_dbus_getgid (void)
{
return getgid ();
}
#endif
_DBUS_DEFINE_GLOBAL_LOCK (atomic);
#ifdef DBUS_USE_ATOMIC_INT_486
/* 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)
{
#ifdef DBUS_USE_ATOMIC_INT_486
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)
{
#ifdef DBUS_USE_ATOMIC_INT_486
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
}
/**
* 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)
{
#ifdef HAVE_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
}
/** 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
}
/**
* 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;
}
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));
close (fd);
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);
close (fd);
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));
close (fd);
_dbus_string_set_length (str, orig_len);
return FALSE;
}
else
total += bytes_read;
}
close (fd);
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);
close (fd);
return FALSE;
}
else
{
close (fd);
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;
}
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 (close (fd) < 0)
{
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)
close (fd);
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;
}
/** 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;
}
if (close (fd) < 0)
{
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));
}
static void
pseudorandom_generate_random_bytes_buffer (char *buffer,
int n_bytes)
{
unsigned long tv_usec;
int i;
/* fall back to pseudorandom */
_dbus_verbose ("Falling back to pseudorandom for %d bytes\n",
n_bytes);
_dbus_get_current_time (NULL, &tv_usec);
srand (tv_usec);
i = 0;
while (i < n_bytes)
{
double r;
unsigned int b;
r = rand ();
b = (r / (double) RAND_MAX) * 255.0;
buffer[i] = b;
++i;
}
}
static dbus_bool_t
pseudorandom_generate_random_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);
pseudorandom_generate_random_bytes_buffer (p, n_bytes);
return TRUE;
}
/**
* Fills n_bytes of the given buffer with random bytes.
*
* @param buffer an allocated buffer
* @param n_bytes the number of bytes in buffer to write to
*/
void
_dbus_generate_random_bytes_buffer (char *buffer,
int n_bytes)
{
DBusString str;
if (!_dbus_string_init (&str))
{
pseudorandom_generate_random_bytes_buffer (buffer, n_bytes);
return;
}
if (!_dbus_generate_random_bytes (&str, n_bytes))
{
_dbus_string_free (&str);
pseudorandom_generate_random_bytes_buffer (buffer, n_bytes);
return;
}
_dbus_string_copy_to_buffer (&str, buffer, n_bytes);
_dbus_string_free (&str);
}
/**
* 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 pseudorandom_generate_random_bytes (str, n_bytes);
if (_dbus_read (fd, str, n_bytes) != n_bytes)
{
close (fd);
_dbus_string_set_length (str, old_len);
return pseudorandom_generate_random_bytes (str, n_bytes);
}
_dbus_verbose ("Read %d bytes from /dev/urandom\n",
n_bytes);
close (fd);
return TRUE;
}
/**
* Generates the given number of random bytes, where the bytes are
* chosen from the alphanumeric ASCII subset.
*
* @param str the string
* @param n_bytes the number of random ASCII bytes to append to string
* @returns #TRUE on success, #FALSE if no memory or other failure
*/
dbus_bool_t
_dbus_generate_random_ascii (DBusString *str,
int n_bytes)
{
static const char letters[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
int i;
int len;
if (!_dbus_generate_random_bytes (str, n_bytes))
return FALSE;
len = _dbus_string_get_length (str);
i = len - n_bytes;
while (i < len)
{
_dbus_string_set_byte (str, i,
letters[_dbus_string_get_byte (str, i) %
(sizeof (letters) - 1)]);
++i;
}
_dbus_assert (_dbus_string_validate_ascii (str, len - n_bytes,
n_bytes));
return TRUE;
}
/**
* A wrapper around strerror() because some platforms
* may be lame and not have strerror().
*
* @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);
}
/**
* Converts a UNIX errno into a #DBusError name.
*
* @todo should cover more errnos, specifically those
* from open().
*
* @param error_number the errno.
* @returns an error name
*/
const char*
_dbus_error_from_errno (int error_number)
{
switch (error_number)
{
case 0:
return DBUS_ERROR_FAILED;
#ifdef EPROTONOSUPPORT
case EPROTONOSUPPORT:
return DBUS_ERROR_NOT_SUPPORTED;
#endif
#ifdef EAFNOSUPPORT
case EAFNOSUPPORT:
return DBUS_ERROR_NOT_SUPPORTED;
#endif
#ifdef ENFILE
case ENFILE:
return DBUS_ERROR_LIMITS_EXCEEDED; /* kernel out of memory */
#endif
#ifdef EMFILE
case EMFILE:
return DBUS_ERROR_LIMITS_EXCEEDED;
#endif
#ifdef EACCES
case EACCES:
return DBUS_ERROR_ACCESS_DENIED;
#endif
#ifdef EPERM
case EPERM:
return DBUS_ERROR_ACCESS_DENIED;
#endif
#ifdef ENOBUFS
case ENOBUFS:
return DBUS_ERROR_NO_MEMORY;
#endif
#ifdef ENOMEM
case ENOMEM:
return DBUS_ERROR_NO_MEMORY;
#endif
#ifdef EINVAL
case EINVAL:
return DBUS_ERROR_FAILED;
#endif
#ifdef EBADF
case EBADF:
return DBUS_ERROR_FAILED;
#endif
#ifdef EFAULT
case EFAULT:
return DBUS_ERROR_FAILED;
#endif
#ifdef ENOTSOCK
case ENOTSOCK:
return DBUS_ERROR_FAILED;
#endif
#ifdef EISCONN
case EISCONN:
return DBUS_ERROR_FAILED;
#endif
#ifdef ECONNREFUSED
case ECONNREFUSED:
return DBUS_ERROR_NO_SERVER;
#endif
#ifdef ETIMEDOUT
case ETIMEDOUT:
return DBUS_ERROR_TIMEOUT;
#endif
#ifdef ENETUNREACH
case ENETUNREACH:
return DBUS_ERROR_NO_NETWORK;
#endif
#ifdef EADDRINUSE
case EADDRINUSE:
return DBUS_ERROR_ADDRESS_IN_USE;
#endif
#ifdef EEXIST
case EEXIST:
return DBUS_ERROR_FILE_NOT_FOUND;
#endif
#ifdef ENOENT
case ENOENT:
return DBUS_ERROR_FILE_NOT_FOUND;
#endif
}
return DBUS_ERROR_FAILED;
}
/**
* Exit the process, returning the given value.
*
* @param code the exit code
*/
void
_dbus_exit (int code)
{
_exit (code);
}
/**
* 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;
}
#if !defined (DBUS_DISABLE_ASSERT) || defined(DBUS_BUILD_TESTS)
/**
* On GNU libc systems, print a crude backtrace to the verbose log.
* On other systems, print "no backtrace support"
*
*/
void
_dbus_print_backtrace (void)
{
#if defined (HAVE_BACKTRACE) && defined (DBUS_ENABLE_VERBOSE_MODE)
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)
{
_dbus_verbose (" %s\n", syms[i]);
++i;
}
free (syms);
#else
_dbus_verbose (" D-Bus not compiled with backtrace support\n");
#endif
}
#endif /* asserts or tests enabled */
/**
* 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;
}
/**
* 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");
close (fds[0]);
close (fds[1]);
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
}
#ifndef DBUS_WIN
/**
* Measure the message length without terminating nul
*/
int _dbus_printf_string_upper_bound (const char *format,
va_list args)
{
char c;
return vsnprintf (&c, 1, format, args);
}
#endif
/** @} end of sysdeps */
/* tests in dbus-sysdeps-util.c */
|