636 lines
13 KiB
C
636 lines
13 KiB
C
/* $NetBSD: misc.c,v 1.14 2008/02/16 07:26:00 matt Exp $ */
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/* Copyright 1988,1990,1993,1994 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 <paul@vix.com> uunet!decwrl!vixie!paul
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*/
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#include <sys/cdefs.h>
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#if !defined(lint) && !defined(LINT)
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#if 0
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static char rcsid[] = "Id: misc.c,v 2.9 1994/01/15 20:43:43 vixie Exp";
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#else
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__RCSID("$NetBSD: misc.c,v 1.14 2008/02/16 07:26:00 matt Exp $");
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#endif
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#endif
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/* vix 26jan87 [RCS has the rest of the log]
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* vix 30dec86 [written]
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*/
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#include "cron.h"
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#if SYS_TIME_H
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# include <sys/time.h>
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#else
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# include <time.h>
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#endif
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#if defined(SYSLOG)
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# include <syslog.h>
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#endif
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#include <ctype.h>
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#include <vis.h>
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#if defined(LOG_DAEMON) && !defined(LOG_CRON)
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#define LOG_CRON LOG_DAEMON
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#endif
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static int in_file(char *, FILE *);
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static void mkprint(char *, unsigned char *, int);
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static int LogFD = ERR;
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int
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strcmp_until(const char *left, const char *right, int until)
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{
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int diff;
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while (*left && *left != until && *left == *right) {
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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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diff = 0;
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} else {
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diff = *left - *right;
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}
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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(char *s)
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{
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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((unsigned char)*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(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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const char * const *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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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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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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void
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set_cron_uid(void)
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{
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#if defined(BSD) || defined(POSIX)
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if (seteuid(ROOT_UID) < OK) {
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warn("cannot seteuid");
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exit(ERROR_EXIT);
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}
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#else
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if (setuid(ROOT_UID) < OK) {
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warn("cannot setuid");
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exit(ERROR_EXIT);
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}
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#endif
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}
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void
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set_cron_cwd(void)
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{
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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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warn("cannot stat %s", 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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warn("cannot create %s", CRONDIR);
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exit(ERROR_EXIT);
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}
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}
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if (!S_ISDIR(sb.st_mode)) {
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warnx("`%s' is not a directory, bailing out", CRONDIR);
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exit(ERROR_EXIT);
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}
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if (chdir(CRONDIR) < OK) {
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warn("cannot chdir(%s), bailing out", 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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warn("cannot stat %s", 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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warn("cannot create %s", SPOOL_DIR);
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exit(ERROR_EXIT);
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}
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}
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if (!S_ISDIR(sb.st_mode)) {
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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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/* acquire_daemonlock() - write our PID into /etc/cron.pid, unless
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* another daemon is already running, which we detect here.
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*
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* note: main() calls us twice; once before forking, once after.
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* we maintain static storage of the file pointer so that we
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* can rewrite our PID into the PIDFILE after the fork.
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*
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* it would be great if fflush() disassociated the file buffer.
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*/
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void
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acquire_daemonlock(int closeflag)
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{
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static FILE *fp = NULL;
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if (closeflag && fp) {
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fclose(fp);
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fp = NULL;
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return;
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}
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if (!fp) {
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char pidfile[MAX_FNAME];
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char buf[MAX_TEMPSTR];
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int fd, otherpid;
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(void) snprintf(pidfile, sizeof(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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snprintf(buf, sizeof(buf),
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"can't open or create %s: %s",
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pidfile, strerror(errno));
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warnx(buf);
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log_it("CRON", getpid(), "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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snprintf(buf, sizeof(buf),
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"can't lock %s, otherpid may be %d: %s",
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pidfile, otherpid, strerror(save_errno));
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warnx(buf);
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log_it("CRON", getpid(), "DEATH", buf);
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exit(ERROR_EXIT);
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}
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(void) fcntl(fd, F_SETFD, 1);
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}
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rewind(fp);
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fprintf(fp, "%d\n", getpid());
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fflush(fp);
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(void) ftruncate(fileno(fp), ftell(fp));
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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 *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(int ch, 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(char *string, int size, FILE *file, const char *terms)
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{
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int ch;
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while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) {
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if (size > 1) {
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*string++ = (char) ch;
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size--;
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}
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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 *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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/* 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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if (ch != EOF)
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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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static int
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in_file(char *string, FILE *file)
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{
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char line[MAX_TEMPSTR];
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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(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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if (allow)
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(void)fcntl(fileno(allow), F_SETFD, FD_CLOEXEC);
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if (deny)
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(void)fcntl(fileno(deny), F_SETFD, FD_CLOEXEC);
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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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void
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log_it(const char *username, int xpid, const char *event, const char *detail)
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{
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PID_T pid = xpid;
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#if defined(LOG_FILE)
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char *msg;
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size_t msglen;
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TIME_T now = time((TIME_T) 0);
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struct tm *t = localtime(&now);
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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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msglen = strlen(username) + strlen(event) + strlen(detail) +
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MAX_TEMPSTR;
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msg = malloc(msglen);
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if (LogFD < OK) {
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LogFD = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
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if (LogFD < OK) {
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warn("can't open log file %s", LOG_FILE);
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} else {
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(void) fcntl(LogFD, F_SETFD, 1);
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}
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}
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/* we have to snprintf() 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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snprintf(msg, msglen, "%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 old BSD
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*/
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if (LogFD < OK || write(LogFD, msg, strlen(msg)) < OK) {
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if (LogFD >= OK)
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warn("can't write to log file");
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write(STDERR, msg, strlen(msg));
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}
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free(msg);
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#endif /*LOG_FILE*/
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#if defined(SYSLOG)
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if (!syslog_open) {
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/* we don't use LOG_PID since the pid passed to us by
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* our client may not be our own. therefore we want to
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* print the pid ourselves.
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*/
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# ifdef LOG_DAEMON
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openlog(getprogname(), LOG_PID, LOG_CRON);
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# else
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openlog(getprogname(), LOG_PID);
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# endif
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syslog_open = TRUE; /* assume openlog success */
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}
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syslog(LOG_INFO, "(%s) %s (%s)\n", username, event, detail);
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#endif /*SYSLOG*/
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#if DEBUGGING
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if (DebugFlags) {
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fprintf(stderr, "log_it: (%s %d) %s (%s)\n",
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username, pid, event, detail);
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}
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#endif
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}
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void
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log_close(void) {
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if (LogFD != ERR) {
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close(LogFD);
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LogFD = ERR;
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}
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}
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/* two warnings:
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* (1) this routine is fairly slow
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* (2) it returns a pointer to static storage
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*/
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char *
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first_word(char *s, /* string we want the first word of */
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const char *t /* terminators, implicitly including \0 */)
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{
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static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish C had GC */
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static int retsel = 0;
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char *rb, *rp;
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/* select a return buffer */
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retsel = 1-retsel;
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rb = &retbuf[retsel][0];
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rp = rb;
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/* skip any leading terminators */
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while (*s && (NULL != strchr(t, *s))) {
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s++;
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}
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/* copy until next terminator or full buffer */
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while (*s && (NULL == strchr(t, *s)) && (rp < &rb[MAX_TEMPSTR])) {
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*rp++ = *s++;
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}
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/* finish the return-string and return it */
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*rp = '\0';
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return rb;
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}
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/* warning:
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* heavily ascii-dependent.
|
|
*/
|
|
static void
|
|
mkprint(char *dst, unsigned char *src, int len)
|
|
{
|
|
while(len > 0 && isblank((unsigned char) *src))
|
|
len--, src++;
|
|
|
|
strvisx(dst, src, len, VIS_TAB|VIS_NL);
|
|
}
|
|
|
|
|
|
/* warning:
|
|
* returns a pointer to malloc'd storage, you must call free yourself.
|
|
*/
|
|
char *
|
|
mkprints(unsigned char *src, unsigned int len)
|
|
{
|
|
char *dst = malloc(len*4 + 1);
|
|
|
|
mkprint(dst, src, len);
|
|
|
|
return dst;
|
|
}
|
|
|
|
|
|
#ifdef MAIL_DATE
|
|
/* Sat, 27 Feb 1993 11:44:51 -0800 (CST)
|
|
* 1234567890123456789012345678901234567
|
|
*/
|
|
char *
|
|
arpadate(time_t *clock)
|
|
{
|
|
static char ret[64]; /* zone name might be >3 chars */
|
|
time_t t = clock ? *clock : time(NULL);
|
|
struct tm *tm = localtime(&t);
|
|
int hours = tm->tm_gmtoff / 3600;
|
|
int minutes = (tp->tm_gmtoff - (hours * 3600)) / 60;
|
|
|
|
if (minutes < 0)
|
|
minutes = -minutes;
|
|
|
|
(void)strftime(ret, sizeof(ret), "%a, %e %b %Y %T ????? (%Z)", &tm);
|
|
(void)snprintf(strchr(ret, '?'), "% .2d%.2d", hours, minutes);
|
|
ret[sizeof(ret) - 1] = '\0';
|
|
return ret;
|
|
}
|
|
#endif /*MAIL_DATE*/
|
|
|
|
|
|
#ifdef HAVE_SAVED_UIDS
|
|
static int save_euid;
|
|
int swap_uids(void) { save_euid = geteuid(); return seteuid(getuid()); }
|
|
#if 0
|
|
int swap_uids_back() { return seteuid(save_euid); }
|
|
#endif
|
|
#else /*HAVE_SAVED_UIDS*/
|
|
int swap_uids(void) { return setreuid(geteuid(), getuid()); }
|
|
#if 0
|
|
int swap_uids_back() { return swap_uids(); }
|
|
#endif
|
|
#endif /*HAVE_SAVED_UIDS*/
|