Paul Vixie's cron, version 3.0. Munged into bmake format. If this goes

well, expect our two seperate directories for cron and crontab to go away
shortly.
Submitted by:	jkh

1 files changed, 664 insertions, 0 deletions

diff --git a/usr.sbin/cron/lib/misc.c b/usr.sbin/cron/lib/misc.c
new file mode 100644
index 0000000..c912ffb
--- /dev/null
+++ b/usr.sbin/cron/lib/misc.c
@@ -0,0 +1,664 @@
+/* Copyright 1988,1990,1993,1994 by Paul Vixie
+ * All rights reserved
+ *
+ * Distribute freely, except: don't remove my name from the source or
+ * documentation (don't take credit for my work), mark your changes (don't
+ * get me blamed for your possible bugs), don't alter or remove this
+ * notice.  May be sold if buildable source is provided to buyer.  No
+ * warrantee of any kind, express or implied, is included with this
+ * software; use at your own risk, responsibility for damages (if any) to
+ * anyone resulting from the use of this software rests entirely with the
+ * user.
+ *
+ * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
+ * I'll try to keep a version up to date.  I can be reached as follows:
+ * Paul Vixie          <paul@vix.com>          uunet!decwrl!vixie!paul
+ */
+
+#if !defined(lint) && !defined(LINT)
+static char rcsid[] = "$Id: misc.c,v 2.9 1994/01/15 20:43:43 vixie Exp $";
+#endif
+
+/* vix 26jan87 [RCS has the rest of the log]
+ * vix 30dec86 [written]
+ */
+
+
+#include "cron.h"
+#if SYS_TIME_H
+# include <sys/time.h>
+#else
+# include <time.h>
+#endif
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#if defined(SYSLOG)
+# include <syslog.h>
+#endif
+
+
+#if defined(LOG_DAEMON) && !defined(LOG_CRON)
+#define LOG_CRON LOG_DAEMON
+#endif
+
+
+static int		LogFD = ERR;
+
+
+int
+strcmp_until(left, right, until)
+	char	*left;
+	char	*right;
+	int	until;
+{
+	register int	diff;
+
+	while (*left && *left != until && *left == *right) {
+		left++;
+		right++;
+	}
+
+	if ((*left=='\0' || *left == until) &&
+	    (*right=='\0' || *right == until)) {
+		diff = 0;
+	} else {
+		diff = *left - *right;
+	}
+
+	return diff;
+}
+
+
+/* strdtb(s) - delete trailing blanks in string 's' and return new length
+ */
+int
+strdtb(s)
+	char	*s;
+{
+	char	*x = s;
+
+	/* scan forward to the null
+	 */
+	while (*x)
+		x++;
+
+	/* scan backward to either the first character before the string,
+	 * or the last non-blank in the string, whichever comes first.
+	 */
+	do	{x--;}
+	while (x >= s && isspace(*x));
+
+	/* one character beyond where we stopped above is where the null
+	 * goes.
+	 */
+	*++x = '\0';
+
+	/* the difference between the position of the null character and
+	 * the position of the first character of the string is the length.
+	 */
+	return x - s;
+}
+
+
+int
+set_debug_flags(flags)
+	char	*flags;
+{
+	/* debug flags are of the form    flag[,flag ...]
+	 *
+	 * if an error occurs, print a message to stdout and return FALSE.
+	 * otherwise return TRUE after setting ERROR_FLAGS.
+	 */
+
+#if !DEBUGGING
+
+	printf("this program was compiled without debugging enabled\n");
+	return FALSE;
+
+#else /* DEBUGGING */
+
+	char	*pc = flags;
+
+	DebugFlags = 0;
+
+	while (*pc) {
+		char	**test;
+		int	mask;
+
+		/* try to find debug flag name in our list.
+		 */
+		for (	test = DebugFlagNames, mask = 1;
+			*test && strcmp_until(*test, pc, ',');
+			test++, mask <<= 1
+		    )
+			;
+
+		if (!*test) {
+			fprintf(stderr,
+				"unrecognized debug flag <%s> <%s>\n",
+				flags, pc);
+			return FALSE;
+		}
+
+		DebugFlags |= mask;
+
+		/* skip to the next flag
+		 */
+		while (*pc && *pc != ',')
+			pc++;
+		if (*pc == ',')
+			pc++;
+	}
+
+	if (DebugFlags) {
+		int	flag;
+
+		fprintf(stderr, "debug flags enabled:");
+
+		for (flag = 0;  DebugFlagNames[flag];  flag++)
+			if (DebugFlags & (1 << flag))
+				fprintf(stderr, " %s", DebugFlagNames[flag]);
+		fprintf(stderr, "\n");
+	}
+
+	return TRUE;
+
+#endif /* DEBUGGING */
+}
+
+
+void
+set_cron_uid()
+{
+#if defined(BSD) || defined(POSIX)
+	if (seteuid(ROOT_UID) < OK) {
+		perror("seteuid");
+		exit(ERROR_EXIT);
+	}
+#else
+	if (setuid(ROOT_UID) < OK) {
+		perror("setuid");
+		exit(ERROR_EXIT);
+	}
+#endif
+}
+
+
+void
+set_cron_cwd()
+{
+	struct stat	sb;
+
+	/* first check for CRONDIR ("/var/cron" or some such)
+	 */
+	if (stat(CRONDIR, &sb) < OK && errno == ENOENT) {
+		perror(CRONDIR);
+		if (OK == mkdir(CRONDIR, 0700)) {
+			fprintf(stderr, "%s: created\n", CRONDIR);
+			stat(CRONDIR, &sb);
+		} else {
+			fprintf(stderr, "%s: ", CRONDIR);
+			perror("mkdir");
+			exit(ERROR_EXIT);
+		}
+	}
+	if (!(sb.st_mode & S_IFDIR)) {
+		fprintf(stderr, "'%s' is not a directory, bailing out.\n",
+			CRONDIR);
+		exit(ERROR_EXIT);
+	}
+	if (chdir(CRONDIR) < OK) {
+		fprintf(stderr, "cannot chdir(%s), bailing out.\n", CRONDIR);
+		perror(CRONDIR);
+		exit(ERROR_EXIT);
+	}
+
+	/* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such)
+	 */
+	if (stat(SPOOL_DIR, &sb) < OK && errno == ENOENT) {
+		perror(SPOOL_DIR);
+		if (OK == mkdir(SPOOL_DIR, 0700)) {
+			fprintf(stderr, "%s: created\n", SPOOL_DIR);
+			stat(SPOOL_DIR, &sb);
+		} else {
+			fprintf(stderr, "%s: ", SPOOL_DIR);
+			perror("mkdir");
+			exit(ERROR_EXIT);
+		}
+	}
+	if (!(sb.st_mode & S_IFDIR)) {
+		fprintf(stderr, "'%s' is not a directory, bailing out.\n",
+			SPOOL_DIR);
+		exit(ERROR_EXIT);
+	}
+}
+
+
+/* acquire_daemonlock() - write our PID into /etc/cron.pid, unless
+ *	another daemon is already running, which we detect here.
+ *
+ * note: main() calls us twice; once before forking, once after.
+ *	we maintain static storage of the file pointer so that we
+ *	can rewrite our PID into the PIDFILE after the fork.
+ *
+ * it would be great if fflush() disassociated the file buffer.
+ */
+void
+acquire_daemonlock(closeflag)
+	int closeflag;
+{
+	static	FILE	*fp = NULL;
+
+	if (closeflag && fp) {
+		fclose(fp);
+		fp = NULL;
+		return;
+	}
+
+	if (!fp) {
+		char	pidfile[MAX_FNAME];
+		char	buf[MAX_TEMPSTR];
+		int	fd, otherpid;
+
+		(void) sprintf(pidfile, PIDFILE, PIDDIR);
+		if ((-1 == (fd = open(pidfile, O_RDWR|O_CREAT, 0644)))
+		    || (NULL == (fp = fdopen(fd, "r+")))
+		    ) {
+			sprintf(buf, "can't open or create %s: %s",
+				pidfile, strerror(errno));
+			fprintf(stderr, "%s: %s\n", ProgramName, buf);
+			log_it("CRON", getpid(), "DEATH", buf);
+			exit(ERROR_EXIT);
+		}
+
+		if (flock(fd, LOCK_EX|LOCK_NB) < OK) {
+			int save_errno = errno;
+
+			fscanf(fp, "%d", &otherpid);
+			sprintf(buf, "can't lock %s, otherpid may be %d: %s",
+				pidfile, otherpid, strerror(save_errno));
+			fprintf(stderr, "%s: %s\n", ProgramName, buf);
+			log_it("CRON", getpid(), "DEATH", buf);
+			exit(ERROR_EXIT);
+		}
+
+		(void) fcntl(fd, F_SETFD, 1);
+	}
+
+	rewind(fp);
+	fprintf(fp, "%d\n", getpid());
+	fflush(fp);
+	(void) ftruncate(fileno(fp), ftell(fp));
+
+	/* abandon fd and fp even though the file is open. we need to
+	 * keep it open and locked, but we don't need the handles elsewhere.
+	 */
+}
+
+/* get_char(file) : like getc() but increment LineNumber on newlines
+ */
+int
+get_char(file)
+	FILE	*file;
+{
+	int	ch;
+
+	ch = getc(file);
+	if (ch == '\n')
+		Set_LineNum(LineNumber + 1)
+	return ch;
+}
+
+
+/* unget_char(ch, file) : like ungetc but do LineNumber processing
+ */
+void
+unget_char(ch, file)
+	int	ch;
+	FILE	*file;
+{
+	ungetc(ch, file);
+	if (ch == '\n')
+		Set_LineNum(LineNumber - 1)
+}
+
+
+/* get_string(str, max, file, termstr) : like fgets() but
+ *		(1) has terminator string which should include \n
+ *		(2) will always leave room for the null
+ *		(3) uses get_char() so LineNumber will be accurate
+ *		(4) returns EOF or terminating character, whichever
+ */
+int
+get_string(string, size, file, terms)
+	char	*string;
+	int	size;
+	FILE	*file;
+	char	*terms;
+{
+	int	ch;
+
+	while (EOF != (ch = get_char(file)) && !strchr(terms, ch)) {
+		if (size > 1) {
+			*string++ = (char) ch;
+			size--;
+		}
+	}
+
+	if (size > 0)
+		*string = '\0';
+
+	return ch;
+}
+
+
+/* skip_comments(file) : read past comment (if any)
+ */
+void
+skip_comments(file)
+	FILE	*file;
+{
+	int	ch;
+
+	while (EOF != (ch = get_char(file))) {
+		/* ch is now the first character of a line.
+		 */
+
+		while (ch == ' ' || ch == '\t')
+			ch = get_char(file);
+
+		if (ch == EOF)
+			break;
+
+		/* ch is now the first non-blank character of a line.
+		 */
+
+		if (ch != '\n' && ch != '#')
+			break;
+
+		/* ch must be a newline or comment as first non-blank
+		 * character on a line.
+		 */
+
+		while (ch != '\n' && ch != EOF)
+			ch = get_char(file);
+
+		/* ch is now the newline of a line which we're going to
+		 * ignore.
+		 */
+	}
+	if (ch != EOF)
+		unget_char(ch, file);
+}
+
+
+/* int in_file(char *string, FILE *file)
+ *	return TRUE if one of the lines in file matches string exactly,
+ *	FALSE otherwise.
+ */
+static int
+in_file(string, file)
+	char *string;
+	FILE *file;
+{
+	char line[MAX_TEMPSTR];
+
+	rewind(file);
+	while (fgets(line, MAX_TEMPSTR, file)) {
+		if (line[0] != '\0')
+			line[strlen(line)-1] = '\0';
+		if (0 == strcmp(line, string))
+			return TRUE;
+	}
+	return FALSE;
+}
+
+
+/* int allowed(char *username)
+ *	returns TRUE if (ALLOW_FILE exists and user is listed)
+ *	or (DENY_FILE exists and user is NOT listed)
+ *	or (neither file exists but user=="root" so it's okay)
+ */
+int
+allowed(username)
+	char *username;
+{
+	static int	init = FALSE;
+	static FILE	*allow, *deny;
+
+	if (!init) {
+		init = TRUE;
+#if defined(ALLOW_FILE) && defined(DENY_FILE)
+		allow = fopen(ALLOW_FILE, "r");
+		deny = fopen(DENY_FILE, "r");
+		Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
+#else
+		allow = NULL;
+		deny = NULL;
+#endif
+	}
+
+	if (allow)
+		return (in_file(username, allow));
+	if (deny)
+		return (!in_file(username, deny));
+
+#if defined(ALLOW_ONLY_ROOT)
+	return (strcmp(username, ROOT_USER) == 0);
+#else
+	return TRUE;
+#endif
+}
+
+
+void
+log_it(username, xpid, event, detail)
+	char	*username;
+	int	xpid;
+	char	*event;
+	char	*detail;
+{
+	PID_T			pid = xpid;
+#if defined(LOG_FILE)
+	char			*msg;
+	TIME_T			now = time((TIME_T) 0);
+	register struct tm	*t = localtime(&now);
+#endif /*LOG_FILE*/
+
+#if defined(SYSLOG)
+	static int		syslog_open = 0;
+#endif
+
+#if defined(LOG_FILE)
+	/* we assume that MAX_TEMPSTR will hold the date, time, &punctuation.
+	 */
+	msg = malloc(strlen(username)
+		     + strlen(event)
+		     + strlen(detail)
+		     + MAX_TEMPSTR);
+
+	if (LogFD < OK) {
+		LogFD = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
+		if (LogFD < OK) {
+			fprintf(stderr, "%s: can't open log file\n",
+				ProgramName);
+			perror(LOG_FILE);
+		} else {
+			(void) fcntl(LogFD, F_SETFD, 1);
+		}
+	}
+
+	/* we have to sprintf() it because fprintf() doesn't always write
+	 * everything out in one chunk and this has to be atomically appended
+	 * to the log file.
+	 */
+	sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n",
+		username,
+		t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, pid,
+		event, detail);
+
+	/* we have to run strlen() because sprintf() returns (char*) on old BSD
+	 */
+	if (LogFD < OK || write(LogFD, msg, strlen(msg)) < OK) {
+		if (LogFD >= OK)
+			perror(LOG_FILE);
+		fprintf(stderr, "%s: can't write to log file\n", ProgramName);
+		write(STDERR, msg, strlen(msg));
+	}
+
+	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_DAEMON
+		openlog(ProgramName, LOG_PID, LOG_CRON);
+# else
+		openlog(ProgramName, LOG_PID);
+# endif
+		syslog_open = TRUE;		/* assume openlog success */
+	}
+
+	syslog(LOG_INFO, "(%s) %s (%s)\n", username, event, detail);
+
+#endif /*SYSLOG*/
+
+#if DEBUGGING
+	if (DebugFlags) {
+		fprintf(stderr, "log_it: (%s %d) %s (%s)\n",
+			username, pid, event, detail);
+	}
+#endif
+}
+
+
+void
+log_close() {
+	if (LogFD != ERR) {
+		close(LogFD);
+		LogFD = ERR;
+	}
+}
+
+
+/* two warnings:
+ *	(1) this routine is fairly slow
+ *	(2) it returns a pointer to static storage
+ */
+char *
+first_word(s, t)
+	register char *s;	/* string we want the first word of */
+	register char *t;	/* terminators, implicitly including \0 */
+{
+	static char retbuf[2][MAX_TEMPSTR + 1];	/* sure wish C had GC */
+	static int retsel = 0;
+	register char *rb, *rp;
+
+	/* select a return buffer */
+	retsel = 1-retsel;
+	rb = &retbuf[retsel][0];
+	rp = rb;
+
+	/* skip any leading terminators */
+	while (*s && (NULL != strchr(t, *s))) {
+		s++;
+	}
+
+	/* copy until next terminator or full buffer */
+	while (*s && (NULL == strchr(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 = '\0';
+}
+
+
+/* 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;
+{
+	register char *dst = malloc(len*4 + 1);
+
+	mkprint(dst, src, len);
+
+	return dst;
+}
+
+
+#ifdef MAIL_DATE
+/* Sat, 27 Feb 93 11:44:51 CST
+ * 123456789012345678901234567
+ */
+char *
+arpadate(clock)
+	time_t *clock;
+{
+	time_t t = clock ?*clock :time(0L);
+	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,
+		       TZONE(*tm));
+	return ret;
+}
+#endif /*MAIL_DATE*/
+
+
+#ifdef HAVE_SAVED_SUIDS
+static int save_euid;
+int swap_uids() { save_euid = geteuid(); return seteuid(getuid()); }
+int swap_uids_back() { return seteuid(save_euid); }
+#else /*HAVE_SAVED_UIDS*/
+int swap_uids() { return setreuid(geteuid(), getuid()); }
+int swap_uids_back() { return swap_uids(); }
+#endif /*HAVE_SAVED_UIDS*/