732 lines
14 KiB
C
732 lines
14 KiB
C
/* Copyright 1988,1990,1993 by Paul Vixie
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* All rights reserved
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*
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* Distribute freely, except: don't remove my name from the source or
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* documentation (don't take credit for my work), mark your changes (don't
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* get me blamed for your possible bugs), don't alter or remove this
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* notice. May be sold if buildable source is provided to buyer. No
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* warrantee of any kind, express or implied, is included with this
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* software; use at your own risk, responsibility for damages (if any) to
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* anyone resulting from the use of this software rests entirely with the
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* user.
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*
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* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
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* I'll try to keep a version up to date. I can be reached as follows:
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* Paul Vixie, 3477 South Court, Palo Alto, CA, 94306, USA, +1 415 858 2736
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* paul@vix.com || paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl}!vixie!paul
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*/
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#ifndef lint
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static char rcsid[] = "$Id: misc.c,v 1.7 1993/09/17 03:46:51 cgd Exp $";
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#endif /* not lint */
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#include "cron.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <errno.h>
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#if defined(ATT)
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# include <fcntl.h>
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#endif
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#if defined(SYSLOG)
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# include <syslog.h>
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#endif
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void log_it(), be_different(), acquire_daemonlock();
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char *
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savestr(str)
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char *str;
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{
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extern char *malloc(), *strcpy();
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/**/ char *temp;
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temp = malloc((unsigned) (strlen(str) + 1));
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(void) strcpy(temp, str);
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return temp;
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}
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int
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nocase_strcmp(left, right)
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char *left;
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char *right;
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{
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while (*left && (MkLower(*left) == MkLower(*right)))
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{
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left++;
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right++;
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}
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return MkLower(*left) - MkLower(*right);
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}
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int
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strcmp_until(left, right, until)
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char *left;
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char *right;
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char until;
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{
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register int diff;
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Debug(DPARS|DEXT, ("strcmp_until(%s,%s,%c) ... ", left, right, until))
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while (*left && *left != until && *left == *right)
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{
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left++;
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right++;
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}
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if ( (*left=='\0' || *left == until)
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&& (*right=='\0' || *right == until)
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)
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diff = 0;
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else
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diff = *left - *right;
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Debug(DPARS|DEXT, ("%d\n", diff))
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return diff;
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}
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/* strdtb(s) - delete trailing blanks in string 's' and return new length
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*/
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int
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strdtb(s)
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register char *s;
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{
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register char *x = s;
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/* scan forward to the null
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*/
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while (*x)
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x++;
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/* scan backward to either the first character before the string,
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* or the last non-blank in the string, whichever comes first.
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*/
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do {x--;}
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while (x >= s && isspace(*x));
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/* one character beyond where we stopped above is where the null
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* goes.
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*/
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*++x = '\0';
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/* the difference between the position of the null character and
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* the position of the first character of the string is the length.
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*/
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return x - s;
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}
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int
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set_debug_flags(flags)
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char *flags;
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{
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/* debug flags are of the form flag[,flag ...]
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*
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* if an error occurs, print a message to stdout and return FALSE.
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* otherwise return TRUE after setting ERROR_FLAGS.
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*/
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#if !DEBUGGING
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printf("this program was compiled without debugging enabled\n");
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return FALSE;
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#else /* DEBUGGING */
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char *pc = flags;
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DebugFlags = 0;
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while (*pc)
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{
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char **test;
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int mask;
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/* try to find debug flag name in our list.
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*/
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for ( test = DebugFlagNames, mask = 1;
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*test && strcmp_until(*test, pc, ',');
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test++, mask <<= 1
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)
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;
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if (!*test)
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{
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fprintf(stderr,
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"unrecognized debug flag <%s> <%s>\n",
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flags, pc);
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return FALSE;
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}
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DebugFlags |= mask;
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/* skip to the next flag
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*/
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while (*pc && *pc != ',')
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pc++;
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if (*pc == ',')
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pc++;
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}
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if (DebugFlags)
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{
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int flag;
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fprintf(stderr, "debug flags enabled:");
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for (flag = 0; DebugFlagNames[flag]; flag++)
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if (DebugFlags & (1 << flag))
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fprintf(stderr, " %s", DebugFlagNames[flag]);
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fprintf(stderr, "\n");
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}
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return TRUE;
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#endif /* DEBUGGING */
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}
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#if defined(BSD)
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void
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set_cron_uid()
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{
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int seteuid();
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if (seteuid(ROOT_UID) < OK)
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{
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perror("seteuid");
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exit(ERROR_EXIT);
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}
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}
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#endif
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#if defined(ATT)
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void
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set_cron_uid()
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{
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int setuid();
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if (setuid(ROOT_UID) < OK)
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{
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perror("setuid");
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exit(ERROR_EXIT);
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}
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}
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#endif
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void
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set_cron_cwd()
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{
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extern int errno;
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struct stat sb;
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/* first check for CRONDIR ("/var/cron" or some such)
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*/
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if (stat(CRONDIR, &sb) < OK && errno == ENOENT) {
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perror(CRONDIR);
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if (OK == mkdir(CRONDIR, 0700)) {
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fprintf(stderr, "%s: created\n", CRONDIR);
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stat(CRONDIR, &sb);
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} else {
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fprintf(stderr, "%s: ", CRONDIR);
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perror("mkdir");
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exit(ERROR_EXIT);
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}
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}
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if (!(sb.st_mode & S_IFDIR)) {
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fprintf(stderr, "'%s' is not a directory, bailing out.\n",
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CRONDIR);
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exit(ERROR_EXIT);
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}
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if (chdir(CRONDIR) < OK) {
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fprintf(stderr, "cannot chdir(%s), bailing out.\n", CRONDIR);
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perror(CRONDIR);
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exit(ERROR_EXIT);
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}
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/* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such)
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*/
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if (stat(SPOOL_DIR, &sb) < OK && errno == ENOENT) {
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perror(SPOOL_DIR);
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if (OK == mkdir(SPOOL_DIR, 0700)) {
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fprintf(stderr, "%s: created\n", SPOOL_DIR);
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stat(SPOOL_DIR, &sb);
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} else {
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fprintf(stderr, "%s: ", SPOOL_DIR);
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perror("mkdir");
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exit(ERROR_EXIT);
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}
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}
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if (!(sb.st_mode & S_IFDIR)) {
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fprintf(stderr, "'%s' is not a directory, bailing out.\n",
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SPOOL_DIR);
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exit(ERROR_EXIT);
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}
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}
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#if defined(BSD)
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void
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be_different()
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{
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/* release the control terminal:
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* get new pgrp (name after our PID)
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* do an IOCTL to void tty association
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*/
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extern int getpid(), setpgrp(), close();
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auto int fd;
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(void) setpgrp(0, getpid());
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if ((fd = open("/dev/tty", 2)) >= 0)
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{
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(void) ioctl(fd, TIOCNOTTY, (char*)0);
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(void) close(fd);
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}
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}
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#endif /*BSD*/
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#if defined(ATT)
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void
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be_different()
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{
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/* not being a system V wiz, I don't know if this is what you have
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* to do to release your control terminal. what I want to accomplish
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* is to keep this process from getting any signals from the tty.
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*
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* some system V person should let me know if this works... (vixie)
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*/
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int setpgrp(), close(), open();
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(void) setpgrp();
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(void) close(STDIN); (void) open("/dev/null", 0);
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(void) close(STDOUT); (void) open("/dev/null", 1);
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(void) close(STDERR); (void) open("/dev/null", 2);
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}
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#endif /*ATT*/
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/* acquire_daemonlock() - write our PID into /etc/crond.pid, unless
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* another daemon is already running, which we detect here.
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*/
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void
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acquire_daemonlock()
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{
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char pidfile[MAX_FNAME];
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FILE *fp;
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int fd, pid = getpid(), otherpid;
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char buf[MAX_TEMPSTR];
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(void) sprintf(pidfile, PIDFILE, PIDDIR);
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if ((-1 == (fd = open(pidfile, O_RDWR|O_CREAT, 0644)))
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|| (NULL == (fp = fdopen(fd, "r+")))
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) {
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sprintf(buf, "can't open or create %s: %s",
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pidfile, strerror(errno));
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log_it("CROND", pid, "DEATH", buf);
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exit(ERROR_EXIT);
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}
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if (flock(fd, LOCK_EX|LOCK_NB) < OK) {
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int save_errno = errno;
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fscanf(fp, "%d", &otherpid);
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sprintf(buf, "can't lock %s, otherpid may be %d: %s",
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pidfile, otherpid, strerror(save_errno));
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log_it("CROND", pid, "DEATH", buf);
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exit(ERROR_EXIT);
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}
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rewind(fp);
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fprintf(fp, "%d\n", pid);
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fflush(fp);
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(void) ftruncate(fd, ftell(fp));
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(void) fcntl(fd, F_SETFD, 1);
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/* abandon fd and fp even though the file is open. we need to
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* keep it open and locked, but we don't need the handles elsewhere.
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*/
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}
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/* get_char(file) : like getc() but increment LineNumber on newlines
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*/
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int
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get_char(file)
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FILE *file;
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{
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int ch;
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ch = getc(file);
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if (ch == '\n')
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Set_LineNum(LineNumber + 1)
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return ch;
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}
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/* unget_char(ch, file) : like ungetc but do LineNumber processing
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*/
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void
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unget_char(ch, file)
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int ch;
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FILE *file;
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{
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ungetc(ch, file);
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if (ch == '\n')
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Set_LineNum(LineNumber - 1)
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}
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/* get_string(str, max, file, termstr) : like fgets() but
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* (1) has terminator string which should include \n
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* (2) will always leave room for the null
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* (3) uses get_char() so LineNumber will be accurate
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* (4) returns EOF or terminating character, whichever
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*/
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int
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get_string(string, size, file, terms)
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char *string;
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int size;
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FILE *file;
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char *terms;
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{
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int ch;
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char *index();
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while (EOF != (ch = get_char(file)) && !index(terms, ch))
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if (size > 1)
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{
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*string++ = (char) ch;
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size--;
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}
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if (size > 0)
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*string = '\0';
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return ch;
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}
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/* skip_comments(file) : read past comment (if any)
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*/
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void
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skip_comments(file)
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FILE *file;
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{
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int ch;
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while (EOF != (ch = get_char(file)))
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{
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/* ch is now the first character of a line.
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*/
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while (ch == ' ' || ch == '\t')
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ch = get_char(file);
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if (ch == EOF)
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break;
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/* ch is now the first non-blank character of a line.
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*/
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if (ch != '\n' && ch != '#')
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break;
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/* ch must be a newline or comment as first non-blank
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* character on a line.
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*/
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while (ch != '\n' && ch != EOF)
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ch = get_char(file);
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/* ch is now the newline of a line which we're going to
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* ignore.
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*/
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}
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unget_char(ch, file);
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}
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/* int in_file(char *string, FILE *file)
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* return TRUE if one of the lines in file matches string exactly,
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* FALSE otherwise.
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*/
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int
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in_file(string, file)
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char *string;
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FILE *file;
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{
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char line[MAX_TEMPSTR];
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/* let's be persnickety today.
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*/
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if (!file) {
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if (!string)
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string = "0x0";
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fprintf(stderr,
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"in_file(\"%s\", 0x%x): called with NULL file--botch",
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string, file);
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exit(ERROR_EXIT);
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}
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rewind(file);
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while (fgets(line, MAX_TEMPSTR, file)) {
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if (line[0] != '\0')
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line[strlen(line)-1] = '\0';
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if (0 == strcmp(line, string))
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return TRUE;
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}
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return FALSE;
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}
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/* int allowed(char *username)
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* returns TRUE if (ALLOW_FILE exists and user is listed)
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* or (DENY_FILE exists and user is NOT listed)
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* or (neither file exists but user=="root" so it's okay)
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*/
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int
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allowed(username)
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char *username;
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{
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static int init = FALSE;
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static FILE *allow, *deny;
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if (!init) {
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init = TRUE;
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#if defined(ALLOW_FILE) && defined(DENY_FILE)
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allow = fopen(ALLOW_FILE, "r");
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deny = fopen(DENY_FILE, "r");
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Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
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#else
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allow = NULL;
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deny = NULL;
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#endif
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}
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if (allow)
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return (in_file(username, allow));
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if (deny)
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return (!in_file(username, deny));
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#if defined(ALLOW_ONLY_ROOT)
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return (strcmp(username, ROOT_USER) == 0);
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#else
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return TRUE;
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#endif
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}
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#if defined(LOG_FILE) || defined(SYSLOG)
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void
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log_it(username, pid, event, detail)
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char *username;
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int pid;
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char *event;
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char *detail;
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{
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#if defined(LOG_FILE)
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extern struct tm *localtime();
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extern long time();
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extern char *malloc();
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auto char *msg;
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auto long now = time((long *) 0);
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register struct tm *t = localtime(&now);
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static int log_fd = -1;
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#endif /*LOG_FILE*/
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#if defined(SYSLOG)
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static int syslog_open = 0;
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#endif
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#if defined(LOG_FILE)
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/* we assume that MAX_TEMPSTR will hold the date, time, &punctuation.
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*/
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msg = malloc(strlen(username)
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+ strlen(event)
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+ strlen(detail)
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+ MAX_TEMPSTR);
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if (log_fd < OK) {
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log_fd = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
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if (log_fd < OK) {
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fprintf(stderr, "%s: can't open log file\n",
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ProgramName);
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perror(LOG_FILE);
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} else {
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(void) fcntl(log_fd, F_SETFD, 1);
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}
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}
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/* we have to sprintf() it because fprintf() doesn't always write
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* everything out in one chunk and this has to be atomically appended
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* to the log file.
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*/
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sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n",
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username,
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t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, pid,
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event, detail);
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/* we have to run strlen() because sprintf() returns (char*) on BSD
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*/
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if (log_fd < OK || write(log_fd, msg, strlen(msg)) < OK) {
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fprintf(stderr, "%s: can't write to log file\n", ProgramName);
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if (log_fd >= OK)
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perror(LOG_FILE);
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write(STDERR, msg, strlen(msg));
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}
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/* I suppose we could use alloca()...
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|
*/
|
|
free(msg);
|
|
#endif /*LOG_FILE*/
|
|
|
|
#if defined(SYSLOG)
|
|
if (!syslog_open) {
|
|
/* we don't use LOG_PID since the pid passed to us by
|
|
* our client may not be our own. therefore we want to
|
|
* print the pid ourselves.
|
|
*/
|
|
# ifdef LOG_CRON
|
|
openlog(ProgramName, 0, LOG_CRON);
|
|
# else
|
|
# ifdef LOG_DAEMON
|
|
openlog(ProgramName, 0, LOG_DAEMON);
|
|
# else
|
|
openlog(ProgramName, 0);
|
|
# endif /*LOG_DAEMON*/
|
|
# endif /*LOG_CRON*/
|
|
syslog_open = TRUE; /* assume openlog success */
|
|
}
|
|
|
|
syslog(LOG_INFO, "(%s %d) %s (%s)\n",
|
|
username, pid, event, detail);
|
|
|
|
#endif /*SYSLOG*/
|
|
|
|
#if DEBUGGING
|
|
if (DebugFlags) {
|
|
fprintf(stderr, "log_it: (%s %d) %s (%s)",
|
|
username, pid, event, detail);
|
|
}
|
|
#endif
|
|
}
|
|
#endif /*LOG_FILE || SYSLOG */
|
|
|
|
|
|
/* two warnings:
|
|
* (1) this routine is fairly slow
|
|
* (2) it returns a pointer to static storage
|
|
*/
|
|
char *
|
|
first_word(s, t)
|
|
local char *s; /* string we want the first word of */
|
|
local char *t; /* terminators, implicitly including \0 */
|
|
{
|
|
static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish I had GC */
|
|
static int retsel = 0;
|
|
local char *rb, *rp;
|
|
extern char *index();
|
|
|
|
/* select a return buffer */
|
|
retsel = 1-retsel;
|
|
rb = &retbuf[retsel][0];
|
|
rp = rb;
|
|
|
|
/* skip any leading terminators */
|
|
while (*s && (NULL != index(t, *s))) {s++;}
|
|
|
|
/* copy until next terminator or full buffer */
|
|
while (*s && (NULL == index(t, *s)) && (rp < &rb[MAX_TEMPSTR])) {
|
|
*rp++ = *s++;
|
|
}
|
|
|
|
/* finish the return-string and return it */
|
|
*rp = '\0';
|
|
return rb;
|
|
}
|
|
|
|
|
|
/* warning:
|
|
* heavily ascii-dependent.
|
|
*/
|
|
|
|
void
|
|
mkprint(dst, src, len)
|
|
register char *dst;
|
|
register unsigned char *src;
|
|
register int len;
|
|
{
|
|
while (len-- > 0)
|
|
{
|
|
register unsigned char ch = *src++;
|
|
|
|
if (ch < ' ') { /* control character */
|
|
*dst++ = '^';
|
|
*dst++ = ch + '@';
|
|
} else if (ch < 0177) { /* printable */
|
|
*dst++ = ch;
|
|
} else if (ch == 0177) { /* delete/rubout */
|
|
*dst++ = '^';
|
|
*dst++ = '?';
|
|
} else { /* parity character */
|
|
sprintf(dst, "\\%03o", ch);
|
|
dst += 4;
|
|
}
|
|
}
|
|
*dst = NULL;
|
|
}
|
|
|
|
|
|
/* warning:
|
|
* returns a pointer to malloc'd storage, you must call free yourself.
|
|
*/
|
|
|
|
char *
|
|
mkprints(src, len)
|
|
register unsigned char *src;
|
|
register unsigned int len;
|
|
{
|
|
extern char *malloc();
|
|
register char *dst = malloc(len*4 + 1);
|
|
|
|
mkprint(dst, src, len);
|
|
|
|
return dst;
|
|
}
|
|
|
|
|
|
/* Sat, 27 Feb 93 11:44:51 CST
|
|
* 123456789012345678901234567
|
|
*/
|
|
|
|
char *
|
|
arpadate(
|
|
time_t *clock
|
|
) {
|
|
time_t t = clock ?*clock :time(NULL);
|
|
struct tm *tm = localtime(&t);
|
|
static char ret[30]; /* zone name might be >3 chars */
|
|
|
|
(void) sprintf(ret, "%s, %2d %s %2d %02d:%02d:%02d %s",
|
|
DowNames[tm->tm_wday],
|
|
tm->tm_mday,
|
|
MonthNames[tm->tm_mon],
|
|
tm->tm_year,
|
|
tm->tm_hour,
|
|
tm->tm_min,
|
|
tm->tm_sec,
|
|
tm->tm_zone);
|
|
return ret;
|
|
}
|