356 lines
7.1 KiB
C
356 lines
7.1 KiB
C
/*
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* $Header$
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* $Source$
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* $Locker$
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*
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* Copyright 1987 by the Student Information Processing Board
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* of the Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose is hereby granted, provided that
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* the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. M.I.T. and the
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* M.I.T. S.I.P.B. make no representations about the suitability of
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* this software for any purpose. It is provided "as is" without
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* express or implied warranty.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#else
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#define PR_GET_DUMPABLE 3
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#endif
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#if (!defined(HAVE_PRCTL) && defined(linux))
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#include <sys/syscall.h>
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#endif
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#ifdef HAVE_SEMAPHORE_H
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#include <semaphore.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_FCNTL
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#include <fcntl.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "com_err.h"
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#include "error_table.h"
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#include "internal.h"
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#ifdef TLS
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#define THREAD_LOCAL static TLS
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#else
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#define THREAD_LOCAL static
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#endif
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THREAD_LOCAL char buffer[25];
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struct et_list * _et_list = (struct et_list *) NULL;
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struct et_list * _et_dynamic_list = (struct et_list *) NULL;
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#ifdef __GNUC__
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#define COMERR_ATTR(x) __attribute__(x)
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#else
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#define COMERR_ATTR(x)
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#endif
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#ifdef HAVE_SEM_INIT
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static sem_t _et_lock;
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static int _et_lock_initialized;
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static void COMERR_ATTR((constructor)) setup_et_lock(void)
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{
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sem_init(&_et_lock, 0, 1);
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_et_lock_initialized = 1;
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}
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static void COMERR_ATTR((destructor)) fini_et_lock(void)
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{
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sem_destroy(&_et_lock);
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_et_lock_initialized = 0;
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}
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#endif
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int et_list_lock(void)
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{
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#ifdef HAVE_SEM_INIT
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if (!_et_lock_initialized)
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setup_et_lock();
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return sem_wait(&_et_lock);
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#else
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return 0;
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#endif
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}
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int et_list_unlock(void)
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{
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#ifdef HAVE_SEM_INIT
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if (_et_lock_initialized)
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return sem_post(&_et_lock);
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#endif
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return 0;
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}
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typedef char *(*gettextf) (const char *);
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static gettextf com_err_gettext = NULL;
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gettextf set_com_err_gettext(gettextf new_proc)
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{
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gettextf x = com_err_gettext;
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com_err_gettext = new_proc;
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return x;
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}
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#ifdef __GNU__
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#define SYS_ERR_BASE 0x40000000
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#else
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#define SYS_ERR_BASE 0
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#endif
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const char * error_message (errcode_t code)
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{
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int offset;
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struct et_list *et;
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errcode_t table_num;
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int started = 0;
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char *cp;
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offset = (int) (code & ((1<<ERRCODE_RANGE)-1));
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table_num = code - offset;
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if (table_num == SYS_ERR_BASE) {
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#ifdef HAS_SYS_ERRLIST
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if (code < sys_nerr)
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return(sys_errlist[code]);
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else
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goto oops;
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#else
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cp = strerror(code);
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if (cp)
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return(cp);
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else
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goto oops;
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#endif
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}
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et_list_lock();
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for (et = _et_list; et; et = et->next) {
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if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
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/* This is the right table */
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if (et->table->n_msgs <= offset) {
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break;
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} else {
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const char *msg = et->table->msgs[offset];
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et_list_unlock();
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if (com_err_gettext)
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return (*com_err_gettext)(msg);
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else
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return msg;
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}
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}
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}
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for (et = _et_dynamic_list; et; et = et->next) {
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if ((et->table->base & 0xffffffL) == (table_num & 0xffffffL)) {
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/* This is the right table */
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if (et->table->n_msgs <= offset) {
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break;
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} else {
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const char *msg = et->table->msgs[offset];
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et_list_unlock();
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if (com_err_gettext)
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return (*com_err_gettext)(msg);
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else
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return msg;
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}
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}
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}
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et_list_unlock();
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oops:
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strcpy (buffer, "Unknown code ");
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if (table_num) {
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strcat (buffer, error_table_name (table_num));
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strcat (buffer, " ");
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}
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for (cp = buffer; *cp; cp++)
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;
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if (offset >= 100) {
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*cp++ = '0' + offset / 100;
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offset %= 100;
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started++;
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}
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if (started || offset >= 10) {
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*cp++ = '0' + offset / 10;
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offset %= 10;
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}
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*cp++ = '0' + offset;
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*cp = '\0';
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return(buffer);
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}
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/*
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* This routine will only return a value if the we are not running as
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* a privileged process.
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*/
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static char *safe_getenv(const char *arg)
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{
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#if !defined(_WIN32)
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if ((getuid() != geteuid()) || (getgid() != getegid()))
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return NULL;
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#endif
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#if HAVE_PRCTL
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if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
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return NULL;
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#else
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#if (defined(linux) && defined(SYS_prctl))
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if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
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return NULL;
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#endif
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#endif
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#if defined(HAVE_SECURE_GETENV)
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return secure_getenv(arg);
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#elif defined(HAVE___SECURE_GETENV)
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return __secure_getenv(arg);
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#else
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return getenv(arg);
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#endif
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}
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#define DEBUG_INIT 0x8000
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#define DEBUG_ADDREMOVE 0x0001
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static int debug_mask = 0;
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static FILE *debug_f = 0;
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static void init_debug(void)
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{
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char *dstr, *fn, *tmp;
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int fd, flags;
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if (debug_mask & DEBUG_INIT)
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return;
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dstr = getenv("COMERR_DEBUG");
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if (dstr) {
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debug_mask = strtoul(dstr, &tmp, 0);
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if (*tmp || errno)
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debug_mask = 0;
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}
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debug_mask |= DEBUG_INIT;
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if (debug_mask == DEBUG_INIT)
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return;
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fn = safe_getenv("COMERR_DEBUG_FILE");
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if (fn)
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debug_f = fopen(fn, "a");
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if (!debug_f)
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debug_f = fopen("/dev/tty", "a");
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if (debug_f) {
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fd = fileno(debug_f);
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#if defined(HAVE_FCNTL)
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if (fd >= 0) {
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flags = fcntl(fd, F_GETFD);
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if (flags >= 0)
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flags = fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
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if (flags < 0) {
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fprintf(debug_f, "Couldn't set FD_CLOEXEC "
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"on debug FILE: %s\n", strerror(errno));
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fclose(debug_f);
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debug_f = NULL;
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debug_mask = DEBUG_INIT;
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}
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}
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#endif
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} else
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debug_mask = DEBUG_INIT;
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}
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/*
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* New interface provided by krb5's com_err library
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*/
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errcode_t add_error_table(const struct error_table * et)
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{
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struct et_list *el;
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if (!(el = (struct et_list *) malloc(sizeof(struct et_list))))
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return ENOMEM;
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if (et_list_lock() != 0) {
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free(el);
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return errno;
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}
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el->table = et;
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el->next = _et_dynamic_list;
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_et_dynamic_list = el;
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init_debug();
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if (debug_mask & DEBUG_ADDREMOVE)
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fprintf(debug_f, "add_error_table: %s (0x%p)\n",
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error_table_name(et->base),
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(const void *) et);
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et_list_unlock();
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return 0;
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}
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/*
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* New interface provided by krb5's com_err library
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*/
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errcode_t remove_error_table(const struct error_table * et)
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{
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struct et_list *el;
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struct et_list *el2 = 0;
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if (et_list_lock() != 0)
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return ENOENT;
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el = _et_dynamic_list;
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init_debug();
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while (el) {
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if (el->table->base == et->base) {
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if (el2) /* Not the beginning of the list */
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el2->next = el->next;
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else
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_et_dynamic_list = el->next;
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(void) free(el);
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if (debug_mask & DEBUG_ADDREMOVE)
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fprintf(debug_f,
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"remove_error_table: %s (0x%p)\n",
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error_table_name(et->base),
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(const void *) et);
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et_list_unlock();
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return 0;
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}
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el2 = el;
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el = el->next;
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}
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if (debug_mask & DEBUG_ADDREMOVE)
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fprintf(debug_f, "remove_error_table FAILED: %s (0x%p)\n",
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error_table_name(et->base),
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(const void *) et);
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et_list_unlock();
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return ENOENT;
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}
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/*
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* Variant of the interface provided by Heimdal's com_err library
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*/
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void
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add_to_error_table(struct et_list *new_table)
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{
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add_error_table(new_table->table);
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}
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