blob: 1b08c16600c3fb70750d2cb79b3286b8ebc7ae2f [file] [log] [blame]
/*
* $Header$
* $Source$
* $Locker$
*
* Copyright 1987 by the Student Information Processing Board
* of the Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose is hereby granted, provided that
* the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. M.I.T. and the
* M.I.T. S.I.P.B. make no representations about the suitability of
* this software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#else
#define PR_GET_DUMPABLE 3
#endif
#if (!defined(HAVE_PRCTL) && defined(linux))
#include <sys/syscall.h>
#endif
#ifdef HAVE_SEMAPHORE_H
#include <semaphore.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include "com_err.h"
#include "error_table.h"
#include "internal.h"
#ifdef TLS
#define THREAD_LOCAL static TLS
#else
#define THREAD_LOCAL static
#endif
THREAD_LOCAL char buffer[25];
struct et_list * _et_list = (struct et_list *) NULL;
struct et_list * _et_dynamic_list = (struct et_list *) NULL;
#ifdef __GNUC__
#define COMERR_ATTR(x) __attribute__(x)
#else
#define COMERR_ATTR(x)
#endif
#ifdef HAVE_SEM_INIT
static sem_t _et_lock;
static int _et_lock_initialized;
static void COMERR_ATTR((constructor)) setup_et_lock(void)
{
sem_init(&_et_lock, 0, 1);
_et_lock_initialized = 1;
}
static void COMERR_ATTR((destructor)) fini_et_lock(void)
{
sem_destroy(&_et_lock);
_et_lock_initialized = 0;
}
#endif
int et_list_lock(void)
{
#ifdef HAVE_SEM_INIT
if (!_et_lock_initialized)
setup_et_lock();
return sem_wait(&_et_lock);
#else
return 0;
#endif
}
int et_list_unlock(void)
{
#ifdef HAVE_SEM_INIT
if (_et_lock_initialized)
return sem_post(&_et_lock);
#endif
return 0;
}
const char * error_message (errcode_t code)
{
int offset;
struct et_list *et;
errcode_t table_num;
int started = 0;
char *cp;
offset = (int) (code & ((1<<ERRCODE_RANGE)-1));
table_num = code - offset;
if (!table_num) {
#ifdef HAS_SYS_ERRLIST
if (offset < sys_nerr)
return(sys_errlist[offset]);
else
goto oops;
#else
cp = strerror(offset);
if (cp)
return(cp);
else
goto oops;
#endif
}
et_list_lock();
for (et = _et_list; et; et = et->next) {
if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
/* This is the right table */
if (et->table->n_msgs <= offset) {
break;
} else {
const char *msg = et->table->msgs[offset];
et_list_unlock();
return msg;
}
}
}
for (et = _et_dynamic_list; et; et = et->next) {
if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
/* This is the right table */
if (et->table->n_msgs <= offset) {
break;
} else {
const char *msg = et->table->msgs[offset];
et_list_unlock();
return msg;
}
}
}
et_list_unlock();
oops:
strcpy (buffer, "Unknown code ");
if (table_num) {
strcat (buffer, error_table_name (table_num));
strcat (buffer, " ");
}
for (cp = buffer; *cp; cp++)
;
if (offset >= 100) {
*cp++ = '0' + offset / 100;
offset %= 100;
started++;
}
if (started || offset >= 10) {
*cp++ = '0' + offset / 10;
offset %= 10;
}
*cp++ = '0' + offset;
*cp = '\0';
return(buffer);
}
/*
* This routine will only return a value if the we are not running as
* a privileged process.
*/
static char *safe_getenv(const char *arg)
{
if ((getuid() != geteuid()) || (getgid() != getegid()))
return NULL;
#if HAVE_PRCTL
if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#else
#if (defined(linux) && defined(SYS_prctl))
if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#endif
#endif
#ifdef HAVE___SECURE_GETENV
return __secure_getenv(arg);
#else
return getenv(arg);
#endif
}
#define DEBUG_INIT 0x8000
#define DEBUG_ADDREMOVE 0x0001
static int debug_mask = 0;
static FILE *debug_f = 0;
static void init_debug(void)
{
char *dstr, *fn, *tmp;
int fd, flags;
if (debug_mask & DEBUG_INIT)
return;
dstr = getenv("COMERR_DEBUG");
if (dstr) {
debug_mask = strtoul(dstr, &tmp, 0);
if (*tmp || errno)
debug_mask = 0;
}
debug_mask |= DEBUG_INIT;
if (debug_mask == DEBUG_INIT)
return;
fn = safe_getenv("COMERR_DEBUG_FILE");
if (fn)
debug_f = fopen(fn, "a");
if (!debug_f)
debug_f = fopen("/dev/tty", "a");
if (debug_f) {
fd = fileno(debug_f);
if (fd >= 0) {
flags = fcntl(fd, F_GETFD);
if (flags >= 0)
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}
} else
debug_mask = DEBUG_INIT;
}
/*
* New interface provided by krb5's com_err library
*/
errcode_t add_error_table(const struct error_table * et)
{
struct et_list *el;
if (!(el = (struct et_list *) malloc(sizeof(struct et_list))))
return ENOMEM;
if (et_list_lock() != 0) {
free(el);
return errno;
}
el->table = et;
el->next = _et_dynamic_list;
_et_dynamic_list = el;
init_debug();
if (debug_mask & DEBUG_ADDREMOVE)
fprintf(debug_f, "add_error_table: %s (0x%p)\n",
error_table_name(et->base),
(const void *) et);
et_list_unlock();
return 0;
}
/*
* New interface provided by krb5's com_err library
*/
errcode_t remove_error_table(const struct error_table * et)
{
struct et_list *el;
struct et_list *el2 = 0;
if (et_list_lock() != 0)
return ENOENT;
el = _et_dynamic_list;
init_debug();
while (el) {
if (el->table->base == et->base) {
if (el2) /* Not the beginning of the list */
el2->next = el->next;
else
_et_dynamic_list = el->next;
(void) free(el);
if (debug_mask & DEBUG_ADDREMOVE)
fprintf(debug_f,
"remove_error_table: %s (0x%p)\n",
error_table_name(et->base),
(const void *) et);
et_list_unlock();
return 0;
}
el2 = el;
el = el->next;
}
if (debug_mask & DEBUG_ADDREMOVE)
fprintf(debug_f, "remove_error_table FAILED: %s (0x%p)\n",
error_table_name(et->base),
(const void *) et);
et_list_unlock();
return ENOENT;
}
/*
* Variant of the interface provided by Heimdal's com_err library
*/
void
add_to_error_table(struct et_list *new_table)
{
add_error_table(new_table->table);
}