66d48cdafe
Tested with: make universe MFC after: 3 days
645 lines
15 KiB
C
645 lines
15 KiB
C
/* 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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#if !defined(lint) && !defined(LINT)
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static const char rcsid[] =
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"$FreeBSD$";
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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 <grp.h>
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#ifdef LOGIN_CAP
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#include <login_cap.h>
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#endif
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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, e_group, e_mem
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#ifdef LOGIN_CAP
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, e_class
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#endif
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} ecode_e;
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static char get_list(bitstr_t *, int, int, char *[], int, FILE *),
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get_range(bitstr_t *, int, int, char *[], int, FILE *),
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get_number(int *, int, char *[], int, FILE *);
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static int set_element(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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"bad group name",
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"out of memory",
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#ifdef LOGIN_CAP
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"bad class name",
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#endif
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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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#ifdef LOGIN_CAP
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if (e->class != NULL)
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free(e->class);
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#endif
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if (e->cmd != NULL)
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free(e->cmd);
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if (e->envp != NULL)
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env_free(e->envp);
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free(e);
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}
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/* return NULL if eof or syntax error occurs;
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* otherwise return a pointer to a new entry.
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*/
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entry *
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load_entry(file, error_func, pw, envp)
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FILE *file;
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void (*error_func)(char *);
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struct passwd *pw;
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char **envp;
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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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char envstr[MAX_ENVSTR];
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char **prev_env;
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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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e = (entry *) calloc(sizeof(entry), sizeof(char));
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if (e == NULL) {
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warn("load_entry: calloc failed");
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return NULL;
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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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Debug(DPARS, ("load_entry()...about to test shortcuts\n"))
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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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Debug(DPARS, ("load_entry()...reboot shortcut\n"))
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e->flags |= WHEN_REBOOT;
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} else if (!strcmp("yearly", cmd) || !strcmp("annually", cmd)){
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Debug(DPARS, ("load_entry()...yearly shortcut\n"))
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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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e->flags |= DOW_STAR;
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} else if (!strcmp("monthly", cmd)) {
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Debug(DPARS, ("load_entry()...monthly shortcut\n"))
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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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e->flags |= DOW_STAR;
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} else if (!strcmp("weekly", cmd)) {
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Debug(DPARS, ("load_entry()...weekly shortcut\n"))
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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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e->flags |= DOM_STAR;
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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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Debug(DPARS, ("load_entry()...daily shortcut\n"))
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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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Debug(DPARS, ("load_entry()...hourly shortcut\n"))
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bit_set(e->minute, 0);
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bit_nset(e->hour, 0, (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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/* Advance past whitespace between shortcut and
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* username/command.
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*/
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Skip_Blanks(ch, file);
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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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} 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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if (!pw) {
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char *username = cmd; /* temp buffer */
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char *s;
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struct group *grp;
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#ifdef LOGIN_CAP
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login_cap_t *lc;
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#endif
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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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#ifdef LOGIN_CAP
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if ((s = strrchr(username, '/')) != NULL) {
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*s = '\0';
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e->class = strdup(s + 1);
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if (e->class == NULL)
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warn("strdup(\"%s\")", s + 1);
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} else {
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e->class = strdup(RESOURCE_RC);
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if (e->class == NULL)
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warn("strdup(\"%s\")", RESOURCE_RC);
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}
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if (e->class == NULL) {
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ecode = e_mem;
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goto eof;
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}
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if ((lc = login_getclass(e->class)) == NULL) {
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ecode = e_class;
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goto eof;
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}
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login_close(lc);
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#endif
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grp = NULL;
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if ((s = strrchr(username, ':')) != NULL) {
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*s = '\0';
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if ((grp = getgrnam(s + 1)) == NULL) {
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ecode = e_group;
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goto eof;
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}
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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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if (grp != NULL)
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pw->pw_gid = grp->gr_gid;
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Debug(DPARS, ("load_entry()...uid %d, gid %d\n",pw->pw_uid,pw->pw_gid))
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#ifdef LOGIN_CAP
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Debug(DPARS, ("load_entry()...class %s\n",e->class))
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#endif
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}
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#ifndef PAM /* PAM takes care of account expiration by itself */
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if (pw->pw_expire && time(NULL) >= pw->pw_expire) {
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ecode = e_username;
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goto eof;
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}
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#endif /* !PAM */
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e->uid = pw->pw_uid;
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e->gid = pw->pw_gid;
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/* copy and fix up environment. some variables are just defaults and
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* others are overrides.
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*/
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e->envp = env_copy(envp);
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if (e->envp == NULL) {
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warn("env_copy");
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ecode = e_mem;
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goto eof;
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}
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if (!env_get("SHELL", e->envp)) {
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prev_env = e->envp;
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sprintf(envstr, "SHELL=%s", _PATH_BSHELL);
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e->envp = env_set(e->envp, envstr);
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if (e->envp == NULL) {
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warn("env_set(%s)", envstr);
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env_free(prev_env);
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ecode = e_mem;
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goto eof;
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}
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}
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if (!env_get("HOME", e->envp)) {
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prev_env = e->envp;
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sprintf(envstr, "HOME=%s", pw->pw_dir);
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e->envp = env_set(e->envp, envstr);
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if (e->envp == NULL) {
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warn("env_set(%s)", envstr);
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env_free(prev_env);
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ecode = e_mem;
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goto eof;
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}
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}
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if (!env_get("PATH", e->envp)) {
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prev_env = e->envp;
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sprintf(envstr, "PATH=%s", _PATH_DEFPATH);
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e->envp = env_set(e->envp, envstr);
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if (e->envp == NULL) {
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warn("env_set(%s)", envstr);
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env_free(prev_env);
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ecode = e_mem;
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goto eof;
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}
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}
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prev_env = e->envp;
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sprintf(envstr, "%s=%s", "LOGNAME", pw->pw_name);
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e->envp = env_set(e->envp, envstr);
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if (e->envp == NULL) {
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warn("env_set(%s)", envstr);
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env_free(prev_env);
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ecode = e_mem;
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goto eof;
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}
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#if defined(BSD)
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prev_env = e->envp;
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sprintf(envstr, "%s=%s", "USER", pw->pw_name);
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e->envp = env_set(e->envp, envstr);
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if (e->envp == NULL) {
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warn("env_set(%s)", envstr);
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env_free(prev_env);
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ecode = e_mem;
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goto eof;
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}
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#endif
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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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* XXX - should use realloc().
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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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if (e->cmd == NULL) {
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warn("strdup(\"%s\")", cmd);
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ecode = e_mem;
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goto eof;
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}
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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:
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free_entry(e);
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if (ecode != e_none && error_func)
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(*error_func)(ecodes[(int)ecode]);
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while (ch != EOF && ch != '\n')
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ch = get_char(file);
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return NULL;
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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 == '/')
|
|
num2 = high;
|
|
else if (ch != '-') {
|
|
/* not a range, it's a single number.
|
|
*/
|
|
if (EOF == set_element(bits, low, high, num1))
|
|
return EOF;
|
|
return ch;
|
|
} else {
|
|
/* eat the dash
|
|
*/
|
|
ch = get_char(file);
|
|
if (ch == EOF)
|
|
return EOF;
|
|
|
|
/* get the number following the dash
|
|
*/
|
|
ch = get_number(&num2, low, names, ch, file);
|
|
if (ch == EOF)
|
|
return EOF;
|
|
}
|
|
}
|
|
|
|
/* check for step size
|
|
*/
|
|
if (ch == '/') {
|
|
/* eat the slash
|
|
*/
|
|
ch = get_char(file);
|
|
if (ch == EOF)
|
|
return EOF;
|
|
|
|
/* get the step size -- note: we don't pass the
|
|
* names here, because the number is not an
|
|
* element id, it's a step size. 'low' is
|
|
* sent as a 0 since there is no offset either.
|
|
*/
|
|
ch = get_number(&num3, 0, PPC_NULL, ch, file);
|
|
if (ch == EOF || num3 == 0)
|
|
return EOF;
|
|
} else {
|
|
/* no step. default==1.
|
|
*/
|
|
num3 = 1;
|
|
}
|
|
|
|
/* range. set all elements from num1 to num2, stepping
|
|
* by num3. (the step is a downward-compatible extension
|
|
* proposed conceptually by bob@acornrc, syntactically
|
|
* designed then implmented by paul vixie).
|
|
*/
|
|
for (i = num1; i <= num2; i += num3)
|
|
if (EOF == set_element(bits, low, high, i))
|
|
return EOF;
|
|
|
|
return ch;
|
|
}
|
|
|
|
|
|
static char
|
|
get_number(numptr, low, names, ch, file)
|
|
int *numptr; /* where does the result go? */
|
|
int low; /* offset applied to result if symbolic enum used */
|
|
char *names[]; /* symbolic names, if any, for enums */
|
|
int ch; /* current character */
|
|
FILE *file; /* source */
|
|
{
|
|
char temp[MAX_TEMPSTR], *pc;
|
|
int len, i, all_digits;
|
|
|
|
/* collect alphanumerics into our fixed-size temp array
|
|
*/
|
|
pc = temp;
|
|
len = 0;
|
|
all_digits = TRUE;
|
|
while (isalnum(ch)) {
|
|
if (++len >= MAX_TEMPSTR)
|
|
return EOF;
|
|
|
|
*pc++ = ch;
|
|
|
|
if (!isdigit(ch))
|
|
all_digits = FALSE;
|
|
|
|
ch = get_char(file);
|
|
}
|
|
*pc = '\0';
|
|
if (len == 0)
|
|
return (EOF);
|
|
|
|
/* try to find the name in the name list
|
|
*/
|
|
if (names) {
|
|
for (i = 0; names[i] != NULL; i++) {
|
|
Debug(DPARS|DEXT,
|
|
("get_num, compare(%s,%s)\n", names[i], temp))
|
|
if (!strcasecmp(names[i], temp)) {
|
|
*numptr = i+low;
|
|
return ch;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* no name list specified, or there is one and our string isn't
|
|
* in it. either way: if it's all digits, use its magnitude.
|
|
* otherwise, it's an error.
|
|
*/
|
|
if (all_digits) {
|
|
*numptr = atoi(temp);
|
|
return ch;
|
|
}
|
|
|
|
return EOF;
|
|
}
|
|
|
|
|
|
static int
|
|
set_element(bits, low, high, number)
|
|
bitstr_t *bits; /* one bit per flag, default=FALSE */
|
|
int low;
|
|
int high;
|
|
int number;
|
|
{
|
|
Debug(DPARS|DEXT, ("set_element(?,%d,%d,%d)\n", low, high, number))
|
|
|
|
if (number < low || number > high)
|
|
return EOF;
|
|
|
|
bit_set(bits, (number-low));
|
|
return OK;
|
|
}
|