502 lines
12 KiB
C
502 lines
12 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 <paul@vix.com> uunet!decwrl!vixie!paul
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*/
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#if !defined(lint) && !defined(LINT)
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static char rcsid[] = "$Id: entry.c,v 1.1.1.1 1994/01/05 20:40:15 jtc Exp $";
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#endif
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/* vix 26jan87 [RCS'd; rest of log is in RCS file]
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* vix 01jan87 [added line-level error recovery]
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* vix 31dec86 [added /step to the from-to range, per bob@acornrc]
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* vix 30dec86 [written]
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*/
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#include "cron.h"
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#include "externs.h"
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#include <pwd.h>
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typedef enum ecode {
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e_none, e_minute, e_hour, e_dom, e_month, e_dow,
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e_cmd, e_timespec, e_username
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} ecode_e;
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static char get_list __P((bitstr_t *, int, int, char *[], int, FILE *)),
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get_range __P((bitstr_t *, int, int, char *[], int, FILE *)),
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get_number __P((int *, int, char *[], int, FILE *));
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static int set_element __P((bitstr_t *, int, int, int));
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static char *ecodes[] =
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{
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"no error",
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"bad minute",
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"bad hour",
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"bad day-of-month",
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"bad month",
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"bad day-of-week",
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"bad command",
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"bad time specifier",
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"bad username",
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};
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void
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free_entry(e)
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entry *e;
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{
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free(e->cmd);
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free(e);
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}
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entry *
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load_entry(file, error_func, syscron)
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FILE *file;
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void (*error_func)();
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int syscron;
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{
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/* this function reads one crontab entry -- the next -- from a file.
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* it skips any leading blank lines, ignores comments, and returns
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* EOF if for any reason the entry can't be read and parsed.
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*
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* the entry is also parsed here.
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*
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* syntax:
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* user crontab:
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* minutes hours doms months dows cmd\n
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* system crontab (/etc/crontab):
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* minutes hours doms months dows USERNAME cmd\n
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*/
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ecode_e ecode = e_none;
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entry *e;
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int ch;
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char cmd[MAX_COMMAND];
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e = (entry *) calloc(sizeof(entry), sizeof(char));
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Debug(DPARS, ("load_entry()...about to eat comments\n"))
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skip_comments(file);
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ch = get_char(file);
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if (ch == EOF)
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return NULL;
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/* ch is now the first useful character of a useful line.
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* it may be an @special or it may be the first character
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* of a list of minutes.
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*/
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if (ch == '@') {
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/* all of these should be flagged and load-limited; i.e.,
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* instead of @hourly meaning "0 * * * *" it should mean
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* "close to the front of every hour but not 'til the
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* system load is low". Problems are: how do you know
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* what "low" means? (save me from /etc/cron.conf!) and:
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* how to guarantee low variance (how low is low?), which
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* means how to we run roughly every hour -- seems like
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* we need to keep a history or let the first hour set
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* the schedule, which means we aren't load-limited
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* anymore. too much for my overloaded brain. (vix, jan90)
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* HINT
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*/
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ch = get_string(cmd, MAX_COMMAND, file, " \t\n");
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if (!strcmp("reboot", cmd)) {
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e->flags |= WHEN_REBOOT;
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} else if (!strcmp("yearly", cmd) || !strcmp("annually", cmd)){
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bit_set(e->minute, 0);
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bit_set(e->hour, 0);
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bit_set(e->dom, 0);
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bit_set(e->month, 0);
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bit_nset(e->dow, 0, (LAST_DOW-FIRST_DOW+1));
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} else if (!strcmp("monthly", cmd)) {
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bit_set(e->minute, 0);
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bit_set(e->hour, 0);
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bit_set(e->dom, 0);
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bit_nset(e->month, 0, (LAST_MONTH-FIRST_MONTH+1));
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bit_nset(e->dow, 0, (LAST_DOW-FIRST_DOW+1));
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} else if (!strcmp("weekly", cmd)) {
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bit_set(e->minute, 0);
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bit_set(e->hour, 0);
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bit_nset(e->dom, 0, (LAST_DOM-FIRST_DOM+1));
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bit_nset(e->month, 0, (LAST_MONTH-FIRST_MONTH+1));
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bit_set(e->dow, 0);
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} else if (!strcmp("daily", cmd) || !strcmp("midnight", cmd)) {
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bit_set(e->minute, 0);
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bit_set(e->hour, 0);
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bit_nset(e->dom, 0, (LAST_DOM-FIRST_DOM+1));
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bit_nset(e->month, 0, (LAST_MONTH-FIRST_MONTH+1));
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bit_nset(e->dow, 0, (LAST_DOW-FIRST_DOW+1));
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} else if (!strcmp("hourly", cmd)) {
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bit_set(e->minute, 0);
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bit_set(e->hour, (LAST_HOUR-FIRST_HOUR+1));
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bit_nset(e->dom, 0, (LAST_DOM-FIRST_DOM+1));
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bit_nset(e->month, 0, (LAST_MONTH-FIRST_MONTH+1));
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bit_nset(e->dow, 0, (LAST_DOW-FIRST_DOW+1));
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} else {
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ecode = e_timespec;
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goto eof;
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}
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} else {
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Debug(DPARS, ("load_entry()...about to parse numerics\n"))
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ch = get_list(e->minute, FIRST_MINUTE, LAST_MINUTE,
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PPC_NULL, ch, file);
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if (ch == EOF) {
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ecode = e_minute;
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goto eof;
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}
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/* hours
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*/
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ch = get_list(e->hour, FIRST_HOUR, LAST_HOUR,
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PPC_NULL, ch, file);
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if (ch == EOF) {
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ecode = e_hour;
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goto eof;
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}
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/* DOM (days of month)
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*/
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if (ch == '*')
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e->flags |= DOM_STAR;
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ch = get_list(e->dom, FIRST_DOM, LAST_DOM,
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PPC_NULL, ch, file);
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if (ch == EOF) {
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ecode = e_dom;
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goto eof;
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}
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/* month
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*/
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ch = get_list(e->month, FIRST_MONTH, LAST_MONTH,
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MonthNames, ch, file);
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if (ch == EOF) {
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ecode = e_month;
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goto eof;
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}
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/* DOW (days of week)
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*/
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if (ch == '*')
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e->flags |= DOW_STAR;
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ch = get_list(e->dow, FIRST_DOW, LAST_DOW,
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DowNames, ch, file);
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if (ch == EOF) {
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ecode = e_dow;
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goto eof;
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}
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}
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/* make sundays equivilent */
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if (bit_test(e->dow, 0) || bit_test(e->dow, 7)) {
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bit_set(e->dow, 0);
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bit_set(e->dow, 7);
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}
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/* ch is the first character of a command, or a username */
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unget_char(ch, file);
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e->exec_uid = 0; /* default to user */
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if (syscron) {
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struct passwd *pw;
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char *username = cmd; /* temp buffer */
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Debug(DPARS, ("load_entry()...about to parse username\n"))
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ch = get_string(username, MAX_COMMAND, file, " \t");
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Debug(DPARS, ("load_entry()...got %s\n",username))
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if (ch == EOF) {
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ecode = e_cmd;
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goto eof;
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}
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pw = getpwnam(username);
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if (pw == NULL) {
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ecode = e_username;
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goto eof;
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}
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Debug(DPARS, ("load_entry()...id %d\n",pw->pw_uid))
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e->exec_uid = pw->pw_uid;
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}
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Debug(DPARS, ("load_entry()...about to parse command\n"))
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/* Everything up to the next \n or EOF is part of the command...
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* too bad we don't know in advance how long it will be, since we
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* need to malloc a string for it... so, we limit it to MAX_COMMAND
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*/
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ch = get_string(cmd, MAX_COMMAND, file, "\n");
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/* a file without a \n before the EOF is rude, so we'll complain...
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*/
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if (ch == EOF) {
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ecode = e_cmd;
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goto eof;
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}
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/* got the command in the 'cmd' string; save it in *e.
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*/
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e->cmd = strdup(cmd);
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Debug(DPARS, ("load_entry()...returning successfully\n"))
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/* success, fini, return pointer to the entry we just created...
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*/
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return e;
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eof: /* if we want to return EOF, we have to jump down here and
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* free the entry we've been building.
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*
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* now, in some cases, a parse routine will have returned EOF to
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* indicate an error, but the file is not actually done. since, in
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* that case, we only want to skip the line with the error on it,
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* we'll do that here.
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*
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* many, including the author, see what's below as evil programming
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* practice: since I didn't want to change the structure of this
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* whole function to support this error recovery, I recurse. Cursed!
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* (At least it's tail-recursion, as if it matters in C - vix/8feb88)
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* I'm seriously considering using (another) GOTO... argh!
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* (this does not get less disgusting over time. vix/15nov88)
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* (indeed not. vix/20dec93)
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*/
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(void) free(e);
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if (feof(file))
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return NULL;
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if (error_func)
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(*error_func)(ecodes[(int)ecode]);
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do {ch = get_char(file);}
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while (ch != EOF && ch != '\n');
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if (ch == EOF)
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return NULL;
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return load_entry(file, error_func, 0);
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}
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static char
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get_list(bits, low, high, names, ch, file)
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bitstr_t *bits; /* one bit per flag, default=FALSE */
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int low, high; /* bounds, impl. offset for bitstr */
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char *names[]; /* NULL or *[] of names for these elements */
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int ch; /* current character being processed */
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FILE *file; /* file being read */
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{
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register int done;
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/* we know that we point to a non-blank character here;
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* must do a Skip_Blanks before we exit, so that the
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* next call (or the code that picks up the cmd) can
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* assume the same thing.
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*/
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Debug(DPARS|DEXT, ("get_list()...entered\n"))
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/* list = range {"," range}
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*/
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/* clear the bit string, since the default is 'off'.
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*/
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bit_nclear(bits, 0, (high-low+1));
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/* process all ranges
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*/
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done = FALSE;
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while (!done) {
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ch = get_range(bits, low, high, names, ch, file);
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if (ch == ',')
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ch = get_char(file);
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else
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done = TRUE;
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}
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/* exiting. skip to some blanks, then skip over the blanks.
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*/
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Skip_Nonblanks(ch, file)
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Skip_Blanks(ch, file)
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Debug(DPARS|DEXT, ("get_list()...exiting w/ %02x\n", ch))
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return ch;
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}
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static char
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get_range(bits, low, high, names, ch, file)
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bitstr_t *bits; /* one bit per flag, default=FALSE */
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int low, high; /* bounds, impl. offset for bitstr */
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char *names[]; /* NULL or names of elements */
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int ch; /* current character being processed */
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FILE *file; /* file being read */
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{
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/* range = number | number "-" number [ "/" number ]
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*/
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register int i;
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auto int num1, num2, num3;
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Debug(DPARS|DEXT, ("get_range()...entering, exit won't show\n"))
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if (ch == '*') {
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/* '*' means "first-last" but can still be modified by /step
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*/
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num1 = low;
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num2 = high;
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ch = get_char(file);
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if (ch == EOF)
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return EOF;
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} else {
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if (EOF == (ch = get_number(&num1, low, names, ch, file)))
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return EOF;
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if (ch != '-') {
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/* not a range, it's a single number.
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*/
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if (EOF == set_element(bits, low, high, num1))
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return EOF;
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return ch;
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} else {
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/* eat the dash
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*/
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ch = get_char(file);
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if (ch == EOF)
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return EOF;
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/* get the number following the dash
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*/
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ch = get_number(&num2, low, names, ch, file);
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if (ch == EOF)
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return EOF;
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}
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}
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/* check for step size
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*/
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if (ch == '/') {
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/* eat the slash
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*/
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ch = get_char(file);
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if (ch == EOF)
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return EOF;
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/* get the step size -- note: we don't pass the
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* names here, because the number is not an
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* element id, it's a step size. 'low' is
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* sent as a 0 since there is no offset either.
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*/
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ch = get_number(&num3, 0, PPC_NULL, ch, file);
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if (ch == EOF)
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return EOF;
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} else {
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/* no step. default==1.
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*/
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num3 = 1;
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}
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/* range. set all elements from num1 to num2, stepping
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* by num3. (the step is a downward-compatible extension
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* proposed conceptually by bob@acornrc, syntactically
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* designed then implmented by paul vixie).
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*/
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for (i = num1; i <= num2; i += num3)
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if (EOF == set_element(bits, low, high, i))
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return EOF;
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return ch;
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}
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static char
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get_number(numptr, low, names, ch, file)
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int *numptr; /* where does the result go? */
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int low; /* offset applied to result if symbolic enum used */
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char *names[]; /* symbolic names, if any, for enums */
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int ch; /* current character */
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FILE *file; /* source */
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{
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char temp[MAX_TEMPSTR], *pc;
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int len, i, all_digits;
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/* collect alphanumerics into our fixed-size temp array
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*/
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pc = temp;
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len = 0;
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all_digits = TRUE;
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while (isalnum(ch)) {
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if (++len >= MAX_TEMPSTR)
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return EOF;
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*pc++ = ch;
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if (!isdigit(ch))
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all_digits = FALSE;
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ch = get_char(file);
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}
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*pc = '\0';
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/* try to find the name in the name list
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*/
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if (names) {
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for (i = 0; names[i] != NULL; i++) {
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Debug(DPARS|DEXT,
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("get_num, compare(%s,%s)\n", names[i], temp))
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if (!strcasecmp(names[i], temp)) {
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*numptr = i+low;
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return ch;
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}
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}
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}
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/* no name list specified, or there is one and our string isn't
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* in it. either way: if it's all digits, use its magnitude.
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* otherwise, it's an error.
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*/
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if (all_digits) {
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*numptr = atoi(temp);
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return ch;
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}
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return EOF;
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}
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static int
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set_element(bits, low, high, number)
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bitstr_t *bits; /* one bit per flag, default=FALSE */
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int low;
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int high;
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int number;
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{
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Debug(DPARS|DEXT, ("set_element(?,%d,%d,%d)\n", low, high, number))
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if (number < low || number > high)
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return EOF;
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bit_set(bits, (number-low));
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return OK;
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}
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