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/*
* Copyright (c) 1995 - 2000, 2002, 2004, 2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kafs_locl.h"
struct procdata {
unsigned long param4;
unsigned long param3;
unsigned long param2;
unsigned long param1;
unsigned long syscall;
};
#ifdef __GNU__
#define _IOT_procdata _IOT(_IOTS(long), 5, 0, 0, 0, 0)
#define VIOC_SYSCALL_PROC _IOW('C', 1, struct procdata)
#else
#define VIOC_SYSCALL_PROC _IOW('C', 1, void *)
#endif
struct devdata {
unsigned long syscall;
unsigned long param1;
unsigned long param2;
unsigned long param3;
unsigned long param4;
unsigned long param5;
unsigned long param6;
unsigned long retval;
};
#ifdef __GNU__
#define _IOT_devdata _IOT(_IOTS(long), 8, 0, 0, 0, 0)
#endif
#ifdef _IOWR
#define VIOC_SYSCALL_DEV _IOWR('C', 2, struct devdata)
#define VIOC_SYSCALL_DEV_OPENAFS _IOWR('C', 1, struct devdata)
#endif
#ifdef _IOW
#ifdef _ILP32
struct sundevdata {
uint32_t param6;
uint32_t param5;
uint32_t param4;
uint32_t param3;
uint32_t param2;
uint32_t param1;
uint32_t syscall;
};
#ifdef __GNU__
#define _IOT_sundevdata _IOT(_IOTS(uint32_t), 7, 0, 0, 0, 0)
#endif
#define VIOC_SUN_SYSCALL_DEV _IOW('C', 2, struct sundevdata)
#else
struct sundevdata {
uint64_t param6;
uint64_t param5;
uint64_t param4;
uint64_t param3;
uint64_t param2;
uint64_t param1;
uint64_t syscall;
};
#ifdef __GNU__
#define _IOT_sundevdata _IOT(_IOTS(uint64_t), 7, 0, 0, 0, 0)
#endif
#define VIOC_SUN_SYSCALL_DEV _IOW('C', 1, struct sundevdata)
#endif
#endif /* _IOW */
int _kafs_debug; /* this should be done in a better way */
#define UNKNOWN_ENTRY_POINT (-1)
#define NO_ENTRY_POINT 0
#define SINGLE_ENTRY_POINT 1
#define MULTIPLE_ENTRY_POINT 2
#define SINGLE_ENTRY_POINT2 3
#define SINGLE_ENTRY_POINT3 4
#define LINUX_PROC_POINT 5
#define AIX_ENTRY_POINTS 6
#define MACOS_DEV_POINT 7
#define SUN_PROC_POINT 8
static int afs_entry_point = UNKNOWN_ENTRY_POINT;
static int afs_syscalls[2];
static char *afs_ioctlpath;
static unsigned long afs_ioctlnum;
/* Magic to get AIX syscalls to work */
#ifdef _AIX
static int (*Pioctl)(char*, int, struct ViceIoctl*, int);
static int (*Setpag)(void);
#include "dlfcn.h"
/*
*
*/
static int
try_aix(void)
{
#ifdef STATIC_AFS_SYSCALLS
Pioctl = aix_pioctl;
Setpag = aix_setpag;
#else
void *ptr;
char path[MaxPathLen], *p;
/*
* If we are root or running setuid don't trust AFSLIBPATH!
*/
if (getuid() != 0 && !issuid() && (p = getenv("AFSLIBPATH")) != NULL)
strlcpy(path, p, sizeof(path));
else
snprintf(path, sizeof(path), "%s/afslib.so", LIBDIR);
ptr = dlopen(path, RTLD_NOW);
if(ptr == NULL) {
if(_kafs_debug) {
if(errno == ENOEXEC && (p = dlerror()) != NULL)
fprintf(stderr, "dlopen(%s): %s\n", path, p);
else if (errno != ENOENT)
fprintf(stderr, "dlopen(%s): %s\n", path, strerror(errno));
}
return 1;
}
Setpag = (int (*)(void))dlsym(ptr, "aix_setpag");
Pioctl = (int (*)(char*, int,
struct ViceIoctl*, int))dlsym(ptr, "aix_pioctl");
#endif
afs_entry_point = AIX_ENTRY_POINTS;
return 0;
}
#endif /* _AIX */
/*
* This probably only works under Solaris and could get confused if
* there's a /etc/name_to_sysnum file.
*/
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
#define _PATH_ETC_NAME_TO_SYSNUM "/etc/name_to_sysnum"
static int
map_syscall_name_to_number (const char *str, int *res)
{
FILE *f;
char buf[256];
size_t str_len = strlen (str);
f = fopen (_PATH_ETC_NAME_TO_SYSNUM, "r");
if (f == NULL)
return -1;
while (fgets (buf, sizeof(buf), f) != NULL) {
if (buf[0] == '#')
continue;
if (strncmp (str, buf, str_len) == 0) {
char *begptr = buf + str_len;
char *endptr;
long val = strtol (begptr, &endptr, 0);
if (val != 0 && endptr != begptr) {
fclose (f);
*res = val;
return 0;
}
}
}
fclose (f);
return -1;
}
#endif
static int
try_ioctlpath(const char *path, unsigned long ioctlnum, int entrypoint)
{
int fd, ret, saved_errno;
fd = open(path, O_RDWR);
if (fd < 0)
return 1;
switch (entrypoint) {
case LINUX_PROC_POINT: {
struct procdata data = { 0, 0, 0, 0, AFSCALL_PIOCTL };
data.param2 = (unsigned long)VIOCGETTOK;
ret = ioctl(fd, ioctlnum, &data);
break;
}
case MACOS_DEV_POINT: {
struct devdata data = { AFSCALL_PIOCTL, 0, 0, 0, 0, 0, 0, 0 };
data.param2 = (unsigned long)VIOCGETTOK;
ret = ioctl(fd, ioctlnum, &data);
break;
}
case SUN_PROC_POINT: {
struct sundevdata data = { 0, 0, 0, 0, 0, 0, AFSCALL_PIOCTL };
data.param2 = (unsigned long)VIOCGETTOK;
ret = ioctl(fd, ioctlnum, &data);
break;
}
default:
abort();
}
saved_errno = errno;
close(fd);
/*
* Be quite liberal in what error are ok, the first is the one
* that should trigger given that params is NULL.
*/
if (ret &&
(saved_errno != EFAULT &&
saved_errno != EDOM &&
saved_errno != ENOTCONN))
return 1;
afs_ioctlnum = ioctlnum;
afs_ioctlpath = strdup(path);
if (afs_ioctlpath == NULL)
return 1;
afs_entry_point = entrypoint;
return 0;
}
static int
do_ioctl(void *data)
{
int fd, ret, saved_errno;
fd = open(afs_ioctlpath, O_RDWR);
if (fd < 0) {
errno = EINVAL;
return -1;
}
ret = ioctl(fd, afs_ioctlnum, data);
saved_errno = errno;
close(fd);
errno = saved_errno;
return ret;
}
int
k_pioctl(char *a_path,
int o_opcode,
struct ViceIoctl *a_paramsP,
int a_followSymlinks)
{
#ifndef NO_AFS
switch(afs_entry_point){
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
case SINGLE_ENTRY_POINT:
case SINGLE_ENTRY_POINT2:
case SINGLE_ENTRY_POINT3:
return syscall(afs_syscalls[0], AFSCALL_PIOCTL,
a_path, o_opcode, a_paramsP, a_followSymlinks);
#endif
#if defined(AFS_PIOCTL)
case MULTIPLE_ENTRY_POINT:
return syscall(afs_syscalls[0],
a_path, o_opcode, a_paramsP, a_followSymlinks);
#endif
case LINUX_PROC_POINT: {
struct procdata data = { 0, 0, 0, 0, AFSCALL_PIOCTL };
data.param1 = (unsigned long)a_path;
data.param2 = (unsigned long)o_opcode;
data.param3 = (unsigned long)a_paramsP;
data.param4 = (unsigned long)a_followSymlinks;
return do_ioctl(&data);
}
case MACOS_DEV_POINT: {
struct devdata data = { AFSCALL_PIOCTL, 0, 0, 0, 0, 0, 0, 0 };
int ret;
data.param1 = (unsigned long)a_path;
data.param2 = (unsigned long)o_opcode;
data.param3 = (unsigned long)a_paramsP;
data.param4 = (unsigned long)a_followSymlinks;
ret = do_ioctl(&data);
if (ret)
return ret;
return data.retval;
}
case SUN_PROC_POINT: {
struct sundevdata data = { 0, 0, 0, 0, 0, 0, AFSCALL_PIOCTL };
data.param1 = (unsigned long)a_path;
data.param2 = (unsigned long)o_opcode;
data.param3 = (unsigned long)a_paramsP;
data.param4 = (unsigned long)a_followSymlinks;
return do_ioctl(&data);
}
#ifdef _AIX
case AIX_ENTRY_POINTS:
return Pioctl(a_path, o_opcode, a_paramsP, a_followSymlinks);
#endif
}
errno = ENOSYS;
#ifdef SIGSYS
kill(getpid(), SIGSYS); /* You lose! */
#endif
#endif /* NO_AFS */
return -1;
}
int
k_afs_cell_of_file(const char *path, char *cell, int len)
{
struct ViceIoctl parms;
parms.in = NULL;
parms.in_size = 0;
parms.out = cell;
parms.out_size = len;
return k_pioctl(rk_UNCONST(path), VIOC_FILE_CELL_NAME, &parms, 1);
}
int
k_unlog(void)
{
struct ViceIoctl parms;
memset(&parms, 0, sizeof(parms));
return k_pioctl(0, VIOCUNLOG, &parms, 0);
}
int
k_setpag(void)
{
#ifndef NO_AFS
switch(afs_entry_point){
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
case SINGLE_ENTRY_POINT:
case SINGLE_ENTRY_POINT2:
case SINGLE_ENTRY_POINT3:
return syscall(afs_syscalls[0], AFSCALL_SETPAG);
#endif
#if defined(AFS_PIOCTL)
case MULTIPLE_ENTRY_POINT:
return syscall(afs_syscalls[1]);
#endif
case LINUX_PROC_POINT: {
struct procdata data = { 0, 0, 0, 0, AFSCALL_SETPAG };
return do_ioctl(&data);
}
case MACOS_DEV_POINT: {
struct devdata data = { AFSCALL_SETPAG, 0, 0, 0, 0, 0, 0, 0 };
int ret = do_ioctl(&data);
if (ret)
return ret;
return data.retval;
}
case SUN_PROC_POINT: {
struct sundevdata data = { 0, 0, 0, 0, 0, 0, AFSCALL_SETPAG };
return do_ioctl(&data);
}
#ifdef _AIX
case AIX_ENTRY_POINTS:
return Setpag();
#endif
}
errno = ENOSYS;
#ifdef SIGSYS
kill(getpid(), SIGSYS); /* You lose! */
#endif
#endif /* NO_AFS */
return -1;
}
static jmp_buf catch_SIGSYS;
#ifdef SIGSYS
static RETSIGTYPE
SIGSYS_handler(int sig)
{
errno = 0;
signal(SIGSYS, SIGSYS_handler); /* Need to reinstall handler on SYSV */
longjmp(catch_SIGSYS, 1);
}
#endif
/*
* Try to see if `syscall' is a pioctl. Return 0 iff succesful.
*/
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
static int
try_one (int syscall_num)
{
struct ViceIoctl parms;
memset(&parms, 0, sizeof(parms));
if (setjmp(catch_SIGSYS) == 0) {
syscall(syscall_num, AFSCALL_PIOCTL,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL) {
afs_entry_point = SINGLE_ENTRY_POINT;
afs_syscalls[0] = syscall_num;
return 0;
}
}
return 1;
}
#endif
/*
* Try to see if `syscall_pioctl' is a pioctl syscall. Return 0 iff
* succesful.
*
*/
#ifdef AFS_PIOCTL
static int
try_two (int syscall_pioctl, int syscall_setpag)
{
struct ViceIoctl parms;
memset(&parms, 0, sizeof(parms));
if (setjmp(catch_SIGSYS) == 0) {
syscall(syscall_pioctl,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL) {
afs_entry_point = MULTIPLE_ENTRY_POINT;
afs_syscalls[0] = syscall_pioctl;
afs_syscalls[1] = syscall_setpag;
return 0;
}
}
return 1;
}
#endif
int
k_hasafs(void)
{
#if !defined(NO_AFS) && defined(SIGSYS)
RETSIGTYPE (*saved_func)(int);
#endif
int saved_errno, ret;
char *env = NULL;
if (!issuid())
env = getenv ("AFS_SYSCALL");
/*
* Already checked presence of AFS syscalls?
*/
if (afs_entry_point != UNKNOWN_ENTRY_POINT)
return afs_entry_point != NO_ENTRY_POINT;
/*
* Probe kernel for AFS specific syscalls,
* they (currently) come in two flavors.
* If the syscall is absent we recive a SIGSYS.
*/
afs_entry_point = NO_ENTRY_POINT;
saved_errno = errno;
#ifndef NO_AFS
#ifdef SIGSYS
saved_func = signal(SIGSYS, SIGSYS_handler);
#endif
if (env && strstr(env, "..") == NULL) {
if (strncmp("/proc/", env, 6) == 0) {
if (try_ioctlpath(env, VIOC_SYSCALL_PROC, LINUX_PROC_POINT) == 0)
goto done;
}
if (strncmp("/dev/", env, 5) == 0) {
#ifdef VIOC_SYSCALL_DEV
if (try_ioctlpath(env, VIOC_SYSCALL_DEV, MACOS_DEV_POINT) == 0)
goto done;
#endif
#ifdef VIOC_SYSCALL_DEV_OPENAFS
if (try_ioctlpath(env,VIOC_SYSCALL_DEV_OPENAFS,MACOS_DEV_POINT) ==0)
goto done;
#endif
}
}
ret = try_ioctlpath("/proc/fs/openafs/afs_ioctl",
VIOC_SYSCALL_PROC, LINUX_PROC_POINT);
if (ret == 0)
goto done;
ret = try_ioctlpath("/proc/fs/nnpfs/afs_ioctl",
VIOC_SYSCALL_PROC, LINUX_PROC_POINT);
if (ret == 0)
goto done;
#ifdef VIOC_SYSCALL_DEV_OPENAFS
ret = try_ioctlpath("/dev/openafs_ioctl",
VIOC_SYSCALL_DEV_OPENAFS, MACOS_DEV_POINT);
if (ret == 0)
goto done;
#endif
#ifdef VIOC_SYSCALL_DEV
ret = try_ioctlpath("/dev/nnpfs_ioctl", VIOC_SYSCALL_DEV, MACOS_DEV_POINT);
if (ret == 0)
goto done;
#endif
#ifdef VIOC_SUN_SYSCALL_DEV
ret = try_ioctlpath("/dev/afs", VIOC_SUN_SYSCALL_DEV, SUN_PROC_POINT);
if (ret == 0)
goto done;
#endif
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
{
int tmp;
if (env != NULL) {
if (sscanf (env, "%d", &tmp) == 1) {
if (try_one (tmp) == 0)
goto done;
} else {
char *end = NULL;
char *p;
char *s = strdup (env);
if (s != NULL) {
for (p = strtok_r (s, ",", &end);
p != NULL;
p = strtok_r (NULL, ",", &end)) {
if (map_syscall_name_to_number (p, &tmp) == 0)
if (try_one (tmp) == 0) {
free (s);
goto done;
}
}
free (s);
}
}
}
}
#endif /* AFS_SYSCALL || AFS_SYSCALL2 || AFS_SYSCALL3 */
#ifdef AFS_SYSCALL
if (try_one (AFS_SYSCALL) == 0)
goto done;
#endif /* AFS_SYSCALL */
#ifdef AFS_PIOCTL
{
int tmp[2];
if (env != NULL && sscanf (env, "%d%d", &tmp[0], &tmp[1]) == 2)
if (try_two (tmp[0], tmp[1]) == 2)
goto done;
}
#endif /* AFS_PIOCTL */
#ifdef AFS_PIOCTL
if (try_two (AFS_PIOCTL, AFS_SETPAG) == 0)
goto done;
#endif /* AFS_PIOCTL */
#ifdef AFS_SYSCALL2
if (try_one (AFS_SYSCALL2) == 0)
goto done;
#endif /* AFS_SYSCALL2 */
#ifdef AFS_SYSCALL3
if (try_one (AFS_SYSCALL3) == 0)
goto done;
#endif /* AFS_SYSCALL3 */
#ifdef _AIX
#if 0
if (env != NULL) {
char *pos = NULL;
char *pioctl_name;
char *setpag_name;
pioctl_name = strtok_r (env, ", \t", &pos);
if (pioctl_name != NULL) {
setpag_name = strtok_r (NULL, ", \t", &pos);
if (setpag_name != NULL)
if (try_aix (pioctl_name, setpag_name) == 0)
goto done;
}
}
#endif
if(try_aix() == 0)
goto done;
#endif
done:
#ifdef SIGSYS
signal(SIGSYS, saved_func);
#endif
#endif /* NO_AFS */
errno = saved_errno;
return afs_entry_point != NO_ENTRY_POINT;
}
int
k_hasafs_recheck(void)
{
afs_entry_point = UNKNOWN_ENTRY_POINT;
return k_hasafs();
}
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