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|
/*
Unix SMB/CIFS implementation.
Samba system utilities
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998-2005
Copyright (C) Timur Bakeyev 2005
Copyright (C) Bjoern Jacke 2006-2007
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/syslog.h"
#include "system/capability.h"
#include "system/passwd.h"
#include "system/filesys.h"
#include "../lib/util/setid.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
/*
The idea is that this file will eventually have wrappers around all
important system calls in samba. The aims are:
- to enable easier porting by putting OS dependent stuff in here
- to allow for hooks into other "pseudo-filesystems"
- to allow easier integration of things like the japanese extensions
- to support the philosophy of Samba to expose the features of
the OS within the SMB model. In general whatever file/printer/variable
expansions/etc make sense to the OS should be acceptable to Samba.
*/
/*******************************************************************
A read wrapper that will deal with EINTR.
********************************************************************/
ssize_t sys_read(int fd, void *buf, size_t count)
{
ssize_t ret;
do {
ret = read(fd, buf, count);
#if defined(EWOULDBLOCK)
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
#else
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
#endif
return ret;
}
/*******************************************************************
A write wrapper that will deal with EINTR.
********************************************************************/
ssize_t sys_write(int fd, const void *buf, size_t count)
{
ssize_t ret;
do {
ret = write(fd, buf, count);
#if defined(EWOULDBLOCK)
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
#else
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
#endif
return ret;
}
/*******************************************************************
A writev wrapper that will deal with EINTR.
********************************************************************/
ssize_t sys_writev(int fd, const struct iovec *iov, int iovcnt)
{
ssize_t ret;
#if 0
/* Try to confuse write_data_iov a bit */
if ((random() % 5) == 0) {
return sys_write(fd, iov[0].iov_base, iov[0].iov_len);
}
if (iov[0].iov_len > 1) {
return sys_write(fd, iov[0].iov_base,
(random() % (iov[0].iov_len-1)) + 1);
}
#endif
do {
ret = writev(fd, iov, iovcnt);
#if defined(EWOULDBLOCK)
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
#else
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
#endif
return ret;
}
/*******************************************************************
A pread wrapper that will deal with EINTR
********************************************************************/
#if defined(HAVE_PREAD)
ssize_t sys_pread(int fd, void *buf, size_t count, off_t off)
{
ssize_t ret;
do {
ret = pread(fd, buf, count, off);
} while (ret == -1 && errno == EINTR);
return ret;
}
#endif
/*******************************************************************
A write wrapper that will deal with EINTR
********************************************************************/
#if defined(HAVE_PWRITE)
ssize_t sys_pwrite(int fd, const void *buf, size_t count, off_t off)
{
ssize_t ret;
do {
ret = pwrite(fd, buf, count, off);
} while (ret == -1 && errno == EINTR);
return ret;
}
#endif
/*******************************************************************
A send wrapper that will deal with EINTR or EAGAIN or EWOULDBLOCK.
********************************************************************/
ssize_t sys_send(int s, const void *msg, size_t len, int flags)
{
ssize_t ret;
do {
ret = send(s, msg, len, flags);
#if defined(EWOULDBLOCK)
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
#else
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
#endif
return ret;
}
/*******************************************************************
A recvfrom wrapper that will deal with EINTR.
********************************************************************/
ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
{
ssize_t ret;
do {
ret = recvfrom(s, buf, len, flags, from, fromlen);
#if defined(EWOULDBLOCK)
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
#else
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
#endif
return ret;
}
/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/
int sys_fcntl_ptr(int fd, int cmd, void *arg)
{
int ret;
do {
ret = fcntl(fd, cmd, arg);
} while (ret == -1 && errno == EINTR);
return ret;
}
/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/
int sys_fcntl_long(int fd, int cmd, long arg)
{
int ret;
do {
ret = fcntl(fd, cmd, arg);
} while (ret == -1 && errno == EINTR);
return ret;
}
/****************************************************************************
Get/Set all the possible time fields from a stat struct as a timespec.
****************************************************************************/
static struct timespec get_atimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
struct timespec ret;
/* Old system - no ns timestamp. */
ret.tv_sec = pst->st_atime;
ret.tv_nsec = 0;
return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
return pst->st_atim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
struct timespec ret;
ret.tv_sec = pst->st_atime;
ret.tv_nsec = pst->st_atimensec;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
struct timespec ret;
ret.tv_sec = pst->st_atime;
ret.tv_nsec = pst->st_atime_n;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
struct timespec ret;
ret.tv_sec = pst->st_atime;
ret.tv_nsec = pst->st_uatime * 1000;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
return pst->st_atimespec;
#else
#error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}
static struct timespec get_mtimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
struct timespec ret;
/* Old system - no ns timestamp. */
ret.tv_sec = pst->st_mtime;
ret.tv_nsec = 0;
return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
return pst->st_mtim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
struct timespec ret;
ret.tv_sec = pst->st_mtime;
ret.tv_nsec = pst->st_mtimensec;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
struct timespec ret;
ret.tv_sec = pst->st_mtime;
ret.tv_nsec = pst->st_mtime_n;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
struct timespec ret;
ret.tv_sec = pst->st_mtime;
ret.tv_nsec = pst->st_umtime * 1000;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
return pst->st_mtimespec;
#else
#error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}
static struct timespec get_ctimespec(const struct stat *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
struct timespec ret;
/* Old system - no ns timestamp. */
ret.tv_sec = pst->st_ctime;
ret.tv_nsec = 0;
return ret;
#else
#if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
return pst->st_ctim;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
struct timespec ret;
ret.tv_sec = pst->st_ctime;
ret.tv_nsec = pst->st_ctimensec;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
struct timespec ret;
ret.tv_sec = pst->st_ctime;
ret.tv_nsec = pst->st_ctime_n;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
struct timespec ret;
ret.tv_sec = pst->st_ctime;
ret.tv_nsec = pst->st_uctime * 1000;
return ret;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
return pst->st_ctimespec;
#else
#error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
#endif
#endif
}
/****************************************************************************
Return the best approximation to a 'create time' under UNIX from a stat
structure.
****************************************************************************/
static struct timespec calc_create_time_stat(const struct stat *st)
{
struct timespec ret, ret1;
struct timespec c_time = get_ctimespec(st);
struct timespec m_time = get_mtimespec(st);
struct timespec a_time = get_atimespec(st);
ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
if(!null_timespec(ret1)) {
return ret1;
}
/*
* One of ctime, mtime or atime was zero (probably atime).
* Just return MIN(ctime, mtime).
*/
return ret;
}
/****************************************************************************
Return the best approximation to a 'create time' under UNIX from a stat_ex
structure.
****************************************************************************/
static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
{
struct timespec ret, ret1;
struct timespec c_time = st->st_ex_ctime;
struct timespec m_time = st->st_ex_mtime;
struct timespec a_time = st->st_ex_atime;
ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
if(!null_timespec(ret1)) {
return ret1;
}
/*
* One of ctime, mtime or atime was zero (probably atime).
* Just return MIN(ctime, mtime).
*/
return ret;
}
/****************************************************************************
Return the 'create time' from a stat struct if it exists (birthtime) or else
use the best approximation.
****************************************************************************/
static void make_create_timespec(const struct stat *pst, struct stat_ex *dst,
bool fake_dir_create_times)
{
if (S_ISDIR(pst->st_mode) && fake_dir_create_times) {
dst->st_ex_btime.tv_sec = 315493200L; /* 1/1/1980 */
dst->st_ex_btime.tv_nsec = 0;
}
dst->st_ex_calculated_birthtime = false;
#if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
dst->st_ex_btime = pst->st_birthtimespec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
dst->st_ex_btime.tv_sec = pst->st_birthtime;
dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
dst->st_ex_btime.tv_sec = pst->st_birthtime;
dst->st_ex_btime.tv_nsec = 0;
#else
dst->st_ex_btime = calc_create_time_stat(pst);
dst->st_ex_calculated_birthtime = true;
#endif
/* Deal with systems that don't initialize birthtime correctly.
* Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
*/
if (null_timespec(dst->st_ex_btime)) {
dst->st_ex_btime = calc_create_time_stat(pst);
dst->st_ex_calculated_birthtime = true;
}
}
/****************************************************************************
If we update a timestamp in a stat_ex struct we may have to recalculate
the birthtime. For now only implement this for write time, but we may
also need to do it for atime and ctime. JRA.
****************************************************************************/
void update_stat_ex_mtime(struct stat_ex *dst,
struct timespec write_ts)
{
dst->st_ex_mtime = write_ts;
/* We may have to recalculate btime. */
if (dst->st_ex_calculated_birthtime) {
dst->st_ex_btime = calc_create_time_stat_ex(dst);
}
}
void update_stat_ex_create_time(struct stat_ex *dst,
struct timespec create_time)
{
dst->st_ex_btime = create_time;
dst->st_ex_calculated_birthtime = false;
}
void init_stat_ex_from_stat (struct stat_ex *dst,
const struct stat *src,
bool fake_dir_create_times)
{
dst->st_ex_dev = src->st_dev;
dst->st_ex_ino = src->st_ino;
dst->st_ex_mode = src->st_mode;
dst->st_ex_nlink = src->st_nlink;
dst->st_ex_uid = src->st_uid;
dst->st_ex_gid = src->st_gid;
dst->st_ex_rdev = src->st_rdev;
dst->st_ex_size = src->st_size;
dst->st_ex_atime = get_atimespec(src);
dst->st_ex_mtime = get_mtimespec(src);
dst->st_ex_ctime = get_ctimespec(src);
make_create_timespec(src, dst, fake_dir_create_times);
#ifdef HAVE_STAT_ST_BLKSIZE
dst->st_ex_blksize = src->st_blksize;
#else
dst->st_ex_blksize = STAT_ST_BLOCKSIZE;
#endif
#ifdef HAVE_STAT_ST_BLOCKS
dst->st_ex_blocks = src->st_blocks;
#else
dst->st_ex_blocks = src->st_size / dst->st_ex_blksize + 1;
#endif
#ifdef HAVE_STAT_ST_FLAGS
dst->st_ex_flags = src->st_flags;
#else
dst->st_ex_flags = 0;
#endif
}
/*******************************************************************
A stat() wrapper.
********************************************************************/
int sys_stat(const char *fname, SMB_STRUCT_STAT *sbuf,
bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = stat(fname, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An fstat() wrapper.
********************************************************************/
int sys_fstat(int fd, SMB_STRUCT_STAT *sbuf, bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = fstat(fd, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An lstat() wrapper.
********************************************************************/
int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = lstat(fname, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An posix_fallocate() wrapper.
********************************************************************/
int sys_posix_fallocate(int fd, off_t offset, off_t len)
{
#if defined(HAVE_POSIX_FALLOCATE) && !defined(HAVE_BROKEN_POSIX_FALLOCATE)
return posix_fallocate(fd, offset, len);
#elif defined(F_RESVSP64)
/* this handles XFS on IRIX */
struct flock64 fl;
off_t new_len = offset + len;
int ret;
struct stat64 sbuf;
/* unlikely to get a too large file on a 64bit system but ... */
if (new_len < 0)
return EFBIG;
fl.l_whence = SEEK_SET;
fl.l_start = offset;
fl.l_len = len;
ret=fcntl(fd, F_RESVSP64, &fl);
if (ret != 0)
return errno;
/* Make sure the file gets enlarged after we allocated space: */
fstat64(fd, &sbuf);
if (new_len > sbuf.st_size)
ftruncate64(fd, new_len);
return 0;
#else
return ENOSYS;
#endif
}
/*******************************************************************
An fallocate() function that matches the semantics of the Linux one.
********************************************************************/
#ifdef HAVE_LINUX_FALLOC_H
#include <linux/falloc.h>
#endif
int sys_fallocate(int fd, enum vfs_fallocate_mode mode, off_t offset, off_t len)
{
#if defined(HAVE_LINUX_FALLOCATE64) || defined(HAVE_LINUX_FALLOCATE)
int lmode;
switch (mode) {
case VFS_FALLOCATE_EXTEND_SIZE:
lmode = 0;
break;
case VFS_FALLOCATE_KEEP_SIZE:
lmode = FALLOC_FL_KEEP_SIZE;
break;
default:
errno = EINVAL;
return -1;
}
#if defined(HAVE_LINUX_FALLOCATE)
return fallocate(fd, lmode, offset, len);
#endif
#else
/* TODO - plumb in fallocate from other filesysetms like VXFS etc. JRA. */
errno = ENOSYS;
return -1;
#endif
}
#if HAVE_KERNEL_SHARE_MODES
#ifndef LOCK_MAND
#define LOCK_MAND 32 /* This is a mandatory flock */
#define LOCK_READ 64 /* ... Which allows concurrent read operations */
#define LOCK_WRITE 128 /* ... Which allows concurrent write operations */
#define LOCK_RW 192 /* ... Which allows concurrent read & write ops */
#endif
#endif
/*******************************************************************
A flock() wrapper that will perform the kernel flock.
********************************************************************/
void kernel_flock(int fd, uint32 share_mode, uint32 access_mask)
{
#if HAVE_KERNEL_SHARE_MODES
int kernel_mode = 0;
if (share_mode == FILE_SHARE_WRITE) {
kernel_mode = LOCK_MAND|LOCK_WRITE;
} else if (share_mode == FILE_SHARE_READ) {
kernel_mode = LOCK_MAND|LOCK_READ;
} else if (share_mode == FILE_SHARE_NONE) {
kernel_mode = LOCK_MAND;
}
if (kernel_mode) {
flock(fd, kernel_mode);
}
#endif
;
}
/*******************************************************************
An fdopendir wrapper.
Ugly hack - we need dirfd for this to work correctly in the
calling code.. JRA.
********************************************************************/
DIR *sys_fdopendir(int fd)
{
#if defined(HAVE_FDOPENDIR) && defined(HAVE_DIRFD)
return fdopendir(fd);
#else
errno = ENOSYS;
return NULL;
#endif
}
/*******************************************************************
An mknod() wrapper.
********************************************************************/
int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
{
#if defined(HAVE_MKNOD)
return mknod(path, mode, dev);
#else
/* No mknod system call. */
errno = ENOSYS;
return -1;
#endif
}
/*******************************************************************
The wait() calls vary between systems
********************************************************************/
int sys_waitpid(pid_t pid,int *status,int options)
{
#ifdef HAVE_WAITPID
return waitpid(pid,status,options);
#else /* HAVE_WAITPID */
return wait4(pid, status, options, NULL);
#endif /* HAVE_WAITPID */
}
/*******************************************************************
System wrapper for getwd. Always returns MALLOC'ed memory, or NULL
on error (malloc fail usually).
********************************************************************/
char *sys_getwd(void)
{
#ifdef GETCWD_TAKES_NULL
return getcwd(NULL, 0);
#elif HAVE_GETCWD
char *wd = NULL, *s = NULL;
size_t allocated = PATH_MAX;
while (1) {
s = SMB_REALLOC_ARRAY(s, char, allocated);
if (s == NULL) {
return NULL;
}
wd = getcwd(s, allocated);
if (wd) {
break;
}
if (errno != ERANGE) {
SAFE_FREE(s);
break;
}
allocated *= 2;
if (allocated < PATH_MAX) {
SAFE_FREE(s);
break;
}
}
return wd;
#else
char *s = SMB_MALLOC_ARRAY(char, PATH_MAX);
if (s == NULL) {
return NULL;
}
return getwd(s);
#endif
}
#if defined(HAVE_POSIX_CAPABILITIES)
/**************************************************************************
Try and abstract process capabilities (for systems that have them).
****************************************************************************/
/* Set the POSIX capabilities needed for the given purpose into the effective
* capability set of the current process. Make sure they are always removed
* from the inheritable set, because there is no circumstance in which our
* children should inherit our elevated privileges.
*/
static bool set_process_capability(enum smbd_capability capability,
bool enable)
{
cap_value_t cap_vals[2] = {0};
int num_cap_vals = 0;
cap_t cap;
#if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
/* On Linux, make sure that any capabilities we grab are sticky
* across UID changes. We expect that this would allow us to keep both
* the effective and permitted capability sets, but as of circa 2.6.16,
* only the permitted set is kept. It is a bug (which we work around)
* that the effective set is lost, but we still require the effective
* set to be kept.
*/
if (!prctl(PR_GET_KEEPCAPS)) {
prctl(PR_SET_KEEPCAPS, 1);
}
#endif
cap = cap_get_proc();
if (cap == NULL) {
DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
strerror(errno)));
return False;
}
switch (capability) {
case KERNEL_OPLOCK_CAPABILITY:
#ifdef CAP_NETWORK_MGT
/* IRIX has CAP_NETWORK_MGT for oplocks. */
cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
#endif
break;
case DMAPI_ACCESS_CAPABILITY:
#ifdef CAP_DEVICE_MGT
/* IRIX has CAP_DEVICE_MGT for DMAPI access. */
cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
#elif CAP_MKNOD
/* Linux has CAP_MKNOD for DMAPI access. */
cap_vals[num_cap_vals++] = CAP_MKNOD;
#endif
break;
case LEASE_CAPABILITY:
#ifdef CAP_LEASE
cap_vals[num_cap_vals++] = CAP_LEASE;
#endif
break;
}
SMB_ASSERT(num_cap_vals <= ARRAY_SIZE(cap_vals));
if (num_cap_vals == 0) {
cap_free(cap);
return True;
}
cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
enable ? CAP_SET : CAP_CLEAR);
/* We never want to pass capabilities down to our children, so make
* sure they are not inherited.
*/
cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);
if (cap_set_proc(cap) == -1) {
DEBUG(0, ("set_process_capability: cap_set_proc failed: %s\n",
strerror(errno)));
cap_free(cap);
return False;
}
cap_free(cap);
return True;
}
#endif /* HAVE_POSIX_CAPABILITIES */
/****************************************************************************
Gain the oplock capability from the kernel if possible.
****************************************************************************/
void set_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
set_process_capability(capability, True);
#endif /* HAVE_POSIX_CAPABILITIES */
}
void drop_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
set_process_capability(capability, False);
#endif /* HAVE_POSIX_CAPABILITIES */
}
/**************************************************************************
Wrapper for random().
****************************************************************************/
long sys_random(void)
{
#if defined(HAVE_RANDOM)
return (long)random();
#elif defined(HAVE_RAND)
return (long)rand();
#else
DEBUG(0,("Error - no random function available !\n"));
exit(1);
#endif
}
/**************************************************************************
Wrapper for srandom().
****************************************************************************/
void sys_srandom(unsigned int seed)
{
#if defined(HAVE_SRANDOM)
srandom(seed);
#elif defined(HAVE_SRAND)
srand(seed);
#else
DEBUG(0,("Error - no srandom function available !\n"));
exit(1);
#endif
}
#ifndef NGROUPS_MAX
#define NGROUPS_MAX 32 /* Guess... */
#endif
/**************************************************************************
Returns equivalent to NGROUPS_MAX - using sysconf if needed.
****************************************************************************/
int groups_max(void)
{
#if defined(SYSCONF_SC_NGROUPS_MAX)
int ret = sysconf(_SC_NGROUPS_MAX);
return (ret == -1) ? NGROUPS_MAX : ret;
#else
return NGROUPS_MAX;
#endif
}
/**************************************************************************
Wrap setgroups and getgroups for systems that declare getgroups() as
returning an array of gid_t, but actuall return an array of int.
****************************************************************************/
#if defined(HAVE_BROKEN_GETGROUPS)
#ifdef HAVE_BROKEN_GETGROUPS
#define GID_T int
#else
#define GID_T gid_t
#endif
static int sys_broken_getgroups(int setlen, gid_t *gidset)
{
GID_T gid;
GID_T *group_list;
int i, ngroups;
if(setlen == 0) {
return getgroups(setlen, &gid);
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if(setlen < 0) {
errno = EINVAL;
return -1;
}
if (setlen == 0)
setlen = groups_max();
if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
DEBUG(0,("sys_getgroups: Malloc fail.\n"));
return -1;
}
if((ngroups = getgroups(setlen, group_list)) < 0) {
int saved_errno = errno;
SAFE_FREE(group_list);
errno = saved_errno;
return -1;
}
for(i = 0; i < ngroups; i++)
gidset[i] = (gid_t)group_list[i];
SAFE_FREE(group_list);
return ngroups;
}
static int sys_broken_setgroups(int setlen, gid_t *gidset)
{
GID_T *group_list;
int i ;
if (setlen == 0)
return 0 ;
if (setlen < 0 || setlen > groups_max()) {
errno = EINVAL;
return -1;
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
DEBUG(0,("sys_setgroups: Malloc fail.\n"));
return -1;
}
for(i = 0; i < setlen; i++)
group_list[i] = (GID_T) gidset[i];
if(samba_setgroups(setlen, group_list) != 0) {
int saved_errno = errno;
SAFE_FREE(group_list);
errno = saved_errno;
return -1;
}
SAFE_FREE(group_list);
return 0 ;
}
#endif /* HAVE_BROKEN_GETGROUPS */
/* This is a list of systems that require the first GID passed to setgroups(2)
* to be the effective GID. If your system is one of these, add it here.
*/
#if defined (FREEBSD) || defined (DARWINOS)
#define USE_BSD_SETGROUPS
#endif
#if defined(USE_BSD_SETGROUPS)
/* Depending on the particular BSD implementation, the first GID that is
* passed to setgroups(2) will either be ignored or will set the credential's
* effective GID. In either case, the right thing to do is to guarantee that
* gidset[0] is the effective GID.
*/
static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
{
gid_t *new_gidset = NULL;
int max;
int ret;
/* setgroups(2) will fail with EINVAL if we pass too many groups. */
max = groups_max();
/* No group list, just make sure we are setting the efective GID. */
if (setlen == 0) {
return samba_setgroups(1, &primary_gid);
}
/* If the primary gid is not the first array element, grow the array
* and insert it at the front.
*/
if (gidset[0] != primary_gid) {
new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
if (new_gidset == NULL) {
return -1;
}
memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
new_gidset[0] = primary_gid;
setlen++;
}
if (setlen > max) {
DEBUG(3, ("forced to truncate group list from %d to %d\n",
setlen, max));
setlen = max;
}
#if defined(HAVE_BROKEN_GETGROUPS)
ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
#else
ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
#endif
if (new_gidset) {
int errsav = errno;
SAFE_FREE(new_gidset);
errno = errsav;
}
return ret;
}
#endif /* USE_BSD_SETGROUPS */
/**************************************************************************
Wrapper for getgroups. Deals with broken (int) case.
****************************************************************************/
int sys_getgroups(int setlen, gid_t *gidset)
{
#if defined(HAVE_BROKEN_GETGROUPS)
return sys_broken_getgroups(setlen, gidset);
#else
return getgroups(setlen, gidset);
#endif
}
/**************************************************************************
Wrapper for setgroups. Deals with broken (int) case and BSD case.
****************************************************************************/
int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
{
#if !defined(HAVE_SETGROUPS)
errno = ENOSYS;
return -1;
#endif /* HAVE_SETGROUPS */
#if defined(USE_BSD_SETGROUPS)
return sys_bsd_setgroups(primary_gid, setlen, gidset);
#elif defined(HAVE_BROKEN_GETGROUPS)
return sys_broken_setgroups(setlen, gidset);
#else
return samba_setgroups(setlen, gidset);
#endif
}
/**************************************************************************
Extract a command into an arg list.
****************************************************************************/
static char **extract_args(TALLOC_CTX *mem_ctx, const char *command)
{
char *trunc_cmd;
char *saveptr;
char *ptr;
int argcl;
char **argl = NULL;
int i;
if (!(trunc_cmd = talloc_strdup(mem_ctx, command))) {
DEBUG(0, ("talloc failed\n"));
goto nomem;
}
if(!(ptr = strtok_r(trunc_cmd, " \t", &saveptr))) {
TALLOC_FREE(trunc_cmd);
errno = EINVAL;
return NULL;
}
/*
* Count the args.
*/
for( argcl = 1; ptr; ptr = strtok_r(NULL, " \t", &saveptr))
argcl++;
TALLOC_FREE(trunc_cmd);
if (!(argl = talloc_array(mem_ctx, char *, argcl + 1))) {
goto nomem;
}
/*
* Now do the extraction.
*/
if (!(trunc_cmd = talloc_strdup(mem_ctx, command))) {
goto nomem;
}
ptr = strtok_r(trunc_cmd, " \t", &saveptr);
i = 0;
if (!(argl[i++] = talloc_strdup(argl, ptr))) {
goto nomem;
}
while((ptr = strtok_r(NULL, " \t", &saveptr)) != NULL) {
if (!(argl[i++] = talloc_strdup(argl, ptr))) {
goto nomem;
}
}
argl[i++] = NULL;
TALLOC_FREE(trunc_cmd);
return argl;
nomem:
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(trunc_cmd);
TALLOC_FREE(argl);
errno = ENOMEM;
return NULL;
}
/**************************************************************************
Wrapper for popen. Safer as it doesn't search a path.
Modified from the glibc sources.
modified by tridge to return a file descriptor. We must kick our FILE* habit
****************************************************************************/
typedef struct _popen_list
{
int fd;
pid_t child_pid;
struct _popen_list *next;
} popen_list;
static popen_list *popen_chain;
int sys_popen(const char *command)
{
int parent_end, child_end;
int pipe_fds[2];
popen_list *entry = NULL;
char **argl = NULL;
int ret;
if (pipe(pipe_fds) < 0)
return -1;
parent_end = pipe_fds[0];
child_end = pipe_fds[1];
if (!*command) {
errno = EINVAL;
goto err_exit;
}
if((entry = SMB_MALLOC_P(popen_list)) == NULL)
goto err_exit;
ZERO_STRUCTP(entry);
/*
* Extract the command and args into a NULL terminated array.
*/
if(!(argl = extract_args(NULL, command)))
goto err_exit;
entry->child_pid = fork();
if (entry->child_pid == -1) {
goto err_exit;
}
if (entry->child_pid == 0) {
/*
* Child !
*/
int child_std_end = STDOUT_FILENO;
popen_list *p;
close(parent_end);
if (child_end != child_std_end) {
dup2 (child_end, child_std_end);
close (child_end);
}
/*
* POSIX.2: "popen() shall ensure that any streams from previous
* popen() calls that remain open in the parent process are closed
* in the new child process."
*/
for (p = popen_chain; p; p = p->next)
close(p->fd);
ret = execv(argl[0], argl);
if (ret == -1) {
DEBUG(0, ("sys_popen: ERROR executing dfree command "
"'%s': %s\n", command, strerror(errno)));
}
_exit (127);
}
/*
* Parent.
*/
close (child_end);
TALLOC_FREE(argl);
/* Link into popen_chain. */
entry->next = popen_chain;
popen_chain = entry;
entry->fd = parent_end;
return entry->fd;
err_exit:
SAFE_FREE(entry);
TALLOC_FREE(argl);
close(pipe_fds[0]);
close(pipe_fds[1]);
return -1;
}
/**************************************************************************
Wrapper for pclose. Modified from the glibc sources.
****************************************************************************/
int sys_pclose(int fd)
{
int wstatus;
popen_list **ptr = &popen_chain;
popen_list *entry = NULL;
pid_t wait_pid;
int status = -1;
/* Unlink from popen_chain. */
for ( ; *ptr != NULL; ptr = &(*ptr)->next) {
if ((*ptr)->fd == fd) {
entry = *ptr;
*ptr = (*ptr)->next;
status = 0;
break;
}
}
if (status < 0 || close(entry->fd) < 0)
return -1;
/*
* As Samba is catching and eating child process
* exits we don't really care about the child exit
* code, a -1 with errno = ECHILD will do fine for us.
*/
do {
wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0);
} while (wait_pid == -1 && errno == EINTR);
SAFE_FREE(entry);
if (wait_pid == -1)
return -1;
return wstatus;
}
/**************************************************************************
Wrapper for Admin Logs.
****************************************************************************/
void sys_adminlog(int priority, const char *format_str, ...)
{
va_list ap;
int ret;
char *msgbuf = NULL;
va_start( ap, format_str );
ret = vasprintf( &msgbuf, format_str, ap );
va_end( ap );
if (ret == -1)
return;
#if defined(HAVE_SYSLOG)
syslog( priority, "%s", msgbuf );
#else
DEBUG(0,("%s", msgbuf ));
#endif
SAFE_FREE(msgbuf);
}
/****************************************************************************
Return the major devicenumber for UNIX extensions.
****************************************************************************/
uint32 unix_dev_major(SMB_DEV_T dev)
{
#if defined(HAVE_DEVICE_MAJOR_FN)
return (uint32)major(dev);
#else
return (uint32)(dev >> 8);
#endif
}
/****************************************************************************
Return the minor devicenumber for UNIX extensions.
****************************************************************************/
uint32 unix_dev_minor(SMB_DEV_T dev)
{
#if defined(HAVE_DEVICE_MINOR_FN)
return (uint32)minor(dev);
#else
return (uint32)(dev & 0xff);
#endif
}
#if 0
/*******************************************************************
Return the number of CPUs.
********************************************************************/
int sys_get_number_of_cores(void)
{
int ret = -1;
#if defined(HAVE_SYSCONF)
#if defined(_SC_NPROCESSORS_ONLN)
ret = (int)sysconf(_SC_NPROCESSORS_ONLN);
#endif
#if defined(_SC_NPROCESSORS_CONF)
if (ret < 1) {
ret = (int)sysconf(_SC_NPROCESSORS_CONF);
}
#endif
#elif defined(HAVE_SYSCTL) && defined(CTL_HW)
int name[2];
unsigned int len = sizeof(ret);
name[0] = CTL_HW;
#if defined(HW_AVAILCPU)
name[1] = HW_AVAILCPU;
if (sysctl(name, 2, &ret, &len, NULL, 0) == -1) {
ret = -1;
}
#endif
#if defined(HW_NCPU)
if(ret < 1) {
name[0] = CTL_HW;
name[1] = HW_NCPU;
if (sysctl(nm, 2, &count, &len, NULL, 0) == -1) {
ret = -1;
}
}
#endif
#endif
if (ret < 1) {
ret = 1;
}
return ret;
}
#endif
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