2 * Copyright (c) 1995 - 2000, 2002, 2004, 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
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15 * documentation and/or other materials provided with the distribution.
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18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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34 #include "kafs_locl.h"
36 RCSID("$Id: afssys.c 17050 2006-04-11 08:12:29Z lha $");
43 unsigned long syscall;
45 #define VIOC_SYSCALL_PROC _IOW('C', 1, void *)
48 unsigned long syscall;
57 #define VIOC_SYSCALL_DEV _IOWR('C', 2, struct devdata)
58 #define VIOC_SYSCALL_DEV_OPENAFS _IOWR('C', 1, struct devdata)
61 int _kafs_debug; /* this should be done in a better way */
63 #define UNKNOWN_ENTRY_POINT (-1)
64 #define NO_ENTRY_POINT 0
65 #define SINGLE_ENTRY_POINT 1
66 #define MULTIPLE_ENTRY_POINT 2
67 #define SINGLE_ENTRY_POINT2 3
68 #define SINGLE_ENTRY_POINT3 4
69 #define LINUX_PROC_POINT 5
70 #define AIX_ENTRY_POINTS 6
71 #define MACOS_DEV_POINT 7
73 static int afs_entry_point = UNKNOWN_ENTRY_POINT;
74 static int afs_syscalls[2];
75 static char *afs_ioctlpath;
76 static unsigned long afs_ioctlnum;
78 /* Magic to get AIX syscalls to work */
81 static int (*Pioctl)(char*, int, struct ViceIoctl*, int);
82 static int (*Setpag)(void);
93 #ifdef STATIC_AFS_SYSCALLS
98 char path[MaxPathLen], *p;
100 * If we are root or running setuid don't trust AFSLIBPATH!
102 if (getuid() != 0 && !issuid() && (p = getenv("AFSLIBPATH")) != NULL)
103 strlcpy(path, p, sizeof(path));
105 snprintf(path, sizeof(path), "%s/afslib.so", LIBDIR);
107 ptr = dlopen(path, RTLD_NOW);
110 if(errno == ENOEXEC && (p = dlerror()) != NULL)
111 fprintf(stderr, "dlopen(%s): %s\n", path, p);
112 else if (errno != ENOENT)
113 fprintf(stderr, "dlopen(%s): %s\n", path, strerror(errno));
117 Setpag = (int (*)(void))dlsym(ptr, "aix_setpag");
118 Pioctl = (int (*)(char*, int,
119 struct ViceIoctl*, int))dlsym(ptr, "aix_pioctl");
121 afs_entry_point = AIX_ENTRY_POINTS;
127 * This probably only works under Solaris and could get confused if
128 * there's a /etc/name_to_sysnum file.
131 #if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
133 #define _PATH_ETC_NAME_TO_SYSNUM "/etc/name_to_sysnum"
136 map_syscall_name_to_number (const char *str, int *res)
140 size_t str_len = strlen (str);
142 f = fopen (_PATH_ETC_NAME_TO_SYSNUM, "r");
145 while (fgets (buf, sizeof(buf), f) != NULL) {
149 if (strncmp (str, buf, str_len) == 0) {
150 char *begptr = buf + str_len;
152 long val = strtol (begptr, &endptr, 0);
154 if (val != 0 && endptr != begptr) {
167 try_ioctlpath(const char *path, unsigned long ioctlnum, int entrypoint)
169 int fd, ret, saved_errno;
171 fd = open(path, O_RDWR);
174 switch (entrypoint) {
175 case LINUX_PROC_POINT: {
176 struct procdata data = { 0, 0, 0, 0, AFSCALL_PIOCTL };
177 data.param2 = (unsigned long)VIOCGETTOK;
178 ret = ioctl(fd, ioctlnum, &data);
181 case MACOS_DEV_POINT: {
182 struct devdata data = { AFSCALL_PIOCTL, 0, 0, 0, 0, 0, 0, 0 };
183 data.param2 = (unsigned long)VIOCGETTOK;
184 ret = ioctl(fd, ioctlnum, &data);
193 * Be quite liberal in what error are ok, the first is the one
194 * that should trigger given that params is NULL.
197 (saved_errno != EFAULT &&
198 saved_errno != EDOM &&
199 saved_errno != ENOTCONN))
201 afs_ioctlnum = ioctlnum;
202 afs_ioctlpath = strdup(path);
203 if (afs_ioctlpath == NULL)
205 afs_entry_point = entrypoint;
212 int fd, ret, saved_errno;
213 fd = open(afs_ioctlpath, O_RDWR);
218 ret = ioctl(fd, afs_ioctlnum, data);
226 k_pioctl(char *a_path,
228 struct ViceIoctl *a_paramsP,
229 int a_followSymlinks)
232 switch(afs_entry_point){
233 #if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
234 case SINGLE_ENTRY_POINT:
235 case SINGLE_ENTRY_POINT2:
236 case SINGLE_ENTRY_POINT3:
237 return syscall(afs_syscalls[0], AFSCALL_PIOCTL,
238 a_path, o_opcode, a_paramsP, a_followSymlinks);
240 #if defined(AFS_PIOCTL)
241 case MULTIPLE_ENTRY_POINT:
242 return syscall(afs_syscalls[0],
243 a_path, o_opcode, a_paramsP, a_followSymlinks);
245 case LINUX_PROC_POINT: {
246 struct procdata data = { 0, 0, 0, 0, AFSCALL_PIOCTL };
247 data.param1 = (unsigned long)a_path;
248 data.param2 = (unsigned long)o_opcode;
249 data.param3 = (unsigned long)a_paramsP;
250 data.param4 = (unsigned long)a_followSymlinks;
251 return do_ioctl(&data);
253 case MACOS_DEV_POINT: {
254 struct devdata data = { AFSCALL_PIOCTL, 0, 0, 0, 0, 0, 0, 0 };
257 data.param1 = (unsigned long)a_path;
258 data.param2 = (unsigned long)o_opcode;
259 data.param3 = (unsigned long)a_paramsP;
260 data.param4 = (unsigned long)a_followSymlinks;
262 ret = do_ioctl(&data);
269 case AIX_ENTRY_POINTS:
270 return Pioctl(a_path, o_opcode, a_paramsP, a_followSymlinks);
275 kill(getpid(), SIGSYS); /* You lose! */
282 k_afs_cell_of_file(const char *path, char *cell, int len)
284 struct ViceIoctl parms;
288 parms.out_size = len;
289 return k_pioctl(rk_UNCONST(path), VIOC_FILE_CELL_NAME, &parms, 1);
295 struct ViceIoctl parms;
296 memset(&parms, 0, sizeof(parms));
297 return k_pioctl(0, VIOCUNLOG, &parms, 0);
304 switch(afs_entry_point){
305 #if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
306 case SINGLE_ENTRY_POINT:
307 case SINGLE_ENTRY_POINT2:
308 case SINGLE_ENTRY_POINT3:
309 return syscall(afs_syscalls[0], AFSCALL_SETPAG);
311 #if defined(AFS_PIOCTL)
312 case MULTIPLE_ENTRY_POINT:
313 return syscall(afs_syscalls[1]);
315 case LINUX_PROC_POINT: {
316 struct procdata data = { 0, 0, 0, 0, AFSCALL_SETPAG };
317 return do_ioctl(&data);
319 case MACOS_DEV_POINT: {
320 struct devdata data = { AFSCALL_SETPAG, 0, 0, 0, 0, 0, 0, 0 };
321 int ret = do_ioctl(&data);
327 case AIX_ENTRY_POINTS:
334 kill(getpid(), SIGSYS); /* You lose! */
340 static jmp_buf catch_SIGSYS;
345 SIGSYS_handler(int sig)
348 signal(SIGSYS, SIGSYS_handler); /* Need to reinstall handler on SYSV */
349 longjmp(catch_SIGSYS, 1);
355 * Try to see if `syscall' is a pioctl. Return 0 iff succesful.
358 #if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
360 try_one (int syscall_num)
362 struct ViceIoctl parms;
363 memset(&parms, 0, sizeof(parms));
365 if (setjmp(catch_SIGSYS) == 0) {
366 syscall(syscall_num, AFSCALL_PIOCTL,
367 0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
368 if (errno == EINVAL) {
369 afs_entry_point = SINGLE_ENTRY_POINT;
370 afs_syscalls[0] = syscall_num;
379 * Try to see if `syscall_pioctl' is a pioctl syscall. Return 0 iff
386 try_two (int syscall_pioctl, int syscall_setpag)
388 struct ViceIoctl parms;
389 memset(&parms, 0, sizeof(parms));
391 if (setjmp(catch_SIGSYS) == 0) {
392 syscall(syscall_pioctl,
393 0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
394 if (errno == EINVAL) {
395 afs_entry_point = MULTIPLE_ENTRY_POINT;
396 afs_syscalls[0] = syscall_pioctl;
397 afs_syscalls[1] = syscall_setpag;
408 #if !defined(NO_AFS) && defined(SIGSYS)
409 RETSIGTYPE (*saved_func)(int);
411 int saved_errno, ret;
415 env = getenv ("AFS_SYSCALL");
418 * Already checked presence of AFS syscalls?
420 if (afs_entry_point != UNKNOWN_ENTRY_POINT)
421 return afs_entry_point != NO_ENTRY_POINT;
424 * Probe kernel for AFS specific syscalls,
425 * they (currently) come in two flavors.
426 * If the syscall is absent we recive a SIGSYS.
428 afs_entry_point = NO_ENTRY_POINT;
433 saved_func = signal(SIGSYS, SIGSYS_handler);
435 if (env && strstr(env, "..") == NULL) {
437 if (strncmp("/proc/", env, 6) == 0) {
438 if (try_ioctlpath(env, VIOC_SYSCALL_PROC, LINUX_PROC_POINT) == 0)
441 if (strncmp("/dev/", env, 5) == 0) {
442 if (try_ioctlpath(env, VIOC_SYSCALL_DEV, MACOS_DEV_POINT) == 0)
444 if (try_ioctlpath(env,VIOC_SYSCALL_DEV_OPENAFS,MACOS_DEV_POINT) ==0)
449 ret = try_ioctlpath("/proc/fs/openafs/afs_ioctl",
450 VIOC_SYSCALL_PROC, LINUX_PROC_POINT);
453 ret = try_ioctlpath("/proc/fs/nnpfs/afs_ioctl",
454 VIOC_SYSCALL_PROC, LINUX_PROC_POINT);
458 ret = try_ioctlpath("/dev/openafs_ioctl",
459 VIOC_SYSCALL_DEV_OPENAFS, MACOS_DEV_POINT);
462 ret = try_ioctlpath("/dev/nnpfs_ioctl", VIOC_SYSCALL_DEV, MACOS_DEV_POINT);
466 #if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
471 if (sscanf (env, "%d", &tmp) == 1) {
472 if (try_one (tmp) == 0)
477 char *s = strdup (env);
480 for (p = strtok_r (s, ",", &end);
482 p = strtok_r (NULL, ",", &end)) {
483 if (map_syscall_name_to_number (p, &tmp) == 0)
484 if (try_one (tmp) == 0) {
494 #endif /* AFS_SYSCALL || AFS_SYSCALL2 || AFS_SYSCALL3 */
497 if (try_one (AFS_SYSCALL) == 0)
499 #endif /* AFS_SYSCALL */
505 if (env != NULL && sscanf (env, "%d%d", &tmp[0], &tmp[1]) == 2)
506 if (try_two (tmp[0], tmp[1]) == 2)
509 #endif /* AFS_PIOCTL */
512 if (try_two (AFS_PIOCTL, AFS_SETPAG) == 0)
514 #endif /* AFS_PIOCTL */
517 if (try_one (AFS_SYSCALL2) == 0)
519 #endif /* AFS_SYSCALL2 */
522 if (try_one (AFS_SYSCALL3) == 0)
524 #endif /* AFS_SYSCALL3 */
533 pioctl_name = strtok_r (env, ", \t", &pos);
534 if (pioctl_name != NULL) {
535 setpag_name = strtok_r (NULL, ", \t", &pos);
536 if (setpag_name != NULL)
537 if (try_aix (pioctl_name, setpag_name) == 0)
550 signal(SIGSYS, saved_func);
554 return afs_entry_point != NO_ENTRY_POINT;
558 k_hasafs_recheck(void)
560 afs_entry_point = UNKNOWN_ENTRY_POINT;