diff options
Diffstat (limited to 'crypto/heimdal/lib/kafs/afssys.c')
| -rw-r--r-- | crypto/heimdal/lib/kafs/afssys.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/kafs/afssys.c b/crypto/heimdal/lib/kafs/afssys.c new file mode 100644 index 0000000..d49a65a --- /dev/null +++ b/crypto/heimdal/lib/kafs/afssys.c @@ -0,0 +1,395 @@ +/* + * Copyright (c) 1995, 1996, 1997, 1998, 1999 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" + +RCSID("$Id: afssys.c,v 1.65 1999/12/02 16:58:40 joda Exp $"); + +int _kafs_debug; /* this should be done in a better way */ + +#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 AIX_ENTRY_POINTS 5 +#define UNKNOWN_ENTRY_POINT 6 +static int afs_entry_point = UNKNOWN_ENTRY_POINT; +static int afs_syscalls[2]; + +/* 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. + */ + +#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 (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; +} + +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 +#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 loose! */ +#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((char*)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 +#ifdef _AIX + case AIX_ENTRY_POINTS: + return Setpag(); +#endif + } + + errno = ENOSYS; +#ifdef SIGSYS + kill(getpid(), SIGSYS); /* You loose! */ +#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)(); +#endif + int saved_errno; + char *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 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; +} |
