usr.sbin/cron/cron/cron.h

   1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
   2  * All rights reserved
   3  *
   4  * Distribute freely, except: don't remove my name from the source or
   5  * documentation (don't take credit for my work), mark your changes (don't
   6  * get me blamed for your possible bugs), don't alter or remove this
   7  * notice.  May be sold if buildable source is provided to buyer.  No
   8  * warrantee of any kind, express or implied, is included with this
   9  * software; use at your own risk, responsibility for damages (if any) to
  10  * anyone resulting from the use of this software rests entirely with the
  11  * user.
  12  *
  13  * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
  14  * I'll try to keep a version up to date.  I can be reached as follows:
  15  * Paul Vixie          <paul@vix.com>          uunet!decwrl!vixie!paul
  16  */
  17
  18 /* cron.h - header for vixie's cron
  19  *
  20  * $FreeBSD: src/usr.sbin/cron/cron/cron.h,v 1.9.2.3 2001/05/28 23:37:26 babkin Exp $
  21  * $DragonFly: src/usr.sbin/cron/cron/cron.h,v 1.5 2006/03/18 20:29:50 dillon Exp $
  22  *
  23  * vix 14nov88 [rest of log is in RCS]
  24  * vix 14jan87 [0 or 7 can be sunday; thanks, mwm@berkeley]
  25  * vix 30dec86 [written]
  26  */
  27
  28 /* reorder these #include's at your peril */
  29
  30 #include <sys/types.h>
  31 #include <sys/param.h>
  32 #include "compat.h"
  33
  34 #include <bitstring.h>
  35 #include <ctype.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <pwd.h>
  39 #include <signal.h>
  40 #include <stdio.h>
  41 #include <time.h>
  42 #include <sys/wait.h>
  43
  44 #include "pathnames.h"
  45 #include "config.h"
  46 #include "externs.h"
  47
  48         /* these are really immutable, and are
  49          *   defined for symbolic convenience only
  50          * TRUE, FALSE, and ERR must be distinct
  51          * ERR must be < OK.
  52          */
  53 #define TRUE            1
  54 #define FALSE           0
  55         /* system calls return this on success */
  56 #define OK              0
  57         /*   or this on error */
  58 #define ERR             (-1)
  59
  60         /* turn this on to get '-x' code */
  61 #ifndef DEBUGGING
  62 #define DEBUGGING       FALSE
  63 #endif
  64
  65 #define READ_PIPE       0       /* which end of a pipe pair do you read? */
  66 #define WRITE_PIPE      1       /*   or write to? */
  67 #define STDIN           0       /* what is stdin's file descriptor? */
  68 #define STDOUT          1       /*   stdout's? */
  69 #define STDERR          2       /*   stderr's? */
  70 #define ERROR_EXIT      1       /* exit() with this will scare the shell */
  71 #define OK_EXIT         0       /* exit() with this is considered 'normal' */
  72 #define MAX_FNAME       100     /* max length of internally generated fn */
  73 #define MAX_COMMAND     1000    /* max length of internally generated cmd */
  74 #define MAX_ENVSTR      1000    /* max length of envvar=value\0 strings */
  75 #define MAX_TEMPSTR     100     /* obvious */
  76 #define MAX_UNAME       20      /* max length of username, should be overkill */
  77 #define ROOT_UID        0       /* don't change this, it really must be root */
  78 #define ROOT_USER       "root"  /* ditto */
  79
  80                                 /* NOTE: these correspond to DebugFlagNames,
  81                                  *      defined below.
  82                                  */
  83 #define DEXT            0x0001  /* extend flag for other debug masks */
  84 #define DSCH            0x0002  /* scheduling debug mask */
  85 #define DPROC           0x0004  /* process control debug mask */
  86 #define DPARS           0x0008  /* parsing debug mask */
  87 #define DLOAD           0x0010  /* database loading debug mask */
  88 #define DMISC           0x0020  /* misc debug mask */
  89 #define DTEST           0x0040  /* test mode: don't execute any commands */
  90 #define DBIT            0x0080  /* bit twiddling shown (long) */
  91
  92 #define CRON_TAB(u)     "%s/%s", SPOOL_DIR, u
  93 #define PPC_NULL        ((char **)NULL)
  94
  95 #ifndef MAXHOSTNAMELEN
  96 #define MAXHOSTNAMELEN 256
  97 #endif
  98
  99 #define Skip_Blanks(c, f) \
 100                         while (c == '\t' || c == ' ') \
 101                                 c = get_char(f);
 102
 103 #define Skip_Nonblanks(c, f) \
 104                         while (c!='\t' && c!=' ' && c!='\n' && c != EOF) \
 105                                 c = get_char(f);
 106
 107 #define Skip_Line(c, f) \
 108                         do {c = get_char(f);} while (c != '\n' && c != EOF);
 109
 110 #if DEBUGGING
 111 # define Debug(mask, message) \
 112                         if ( (DebugFlags & (mask) ) == (mask) ) \
 113                                 printf message;
 114 #else /* !DEBUGGING */
 115 # define Debug(mask, message) \
 116                         ;
 117 #endif /* DEBUGGING */
 118
 119 #define MkLower(ch)     (isupper(ch) ? tolower(ch) : ch)
 120 #define MkUpper(ch)     (islower(ch) ? toupper(ch) : ch)
 121 #define Set_LineNum(ln) {Debug(DPARS|DEXT,("linenum=%d\n",ln)); \
 122                          LineNumber = ln; \
 123                         }
 124
 125 #define FIRST_MINUTE    0
 126 #define LAST_MINUTE     59
 127 #define MINUTE_COUNT    (LAST_MINUTE - FIRST_MINUTE + 1)
 128
 129 #define FIRST_HOUR      0
 130 #define LAST_HOUR       23
 131 #define HOUR_COUNT      (LAST_HOUR - FIRST_HOUR + 1)
 132
 133 #define FIRST_DOM       1
 134 #define LAST_DOM        31
 135 #define DOM_COUNT       (LAST_DOM - FIRST_DOM + 1)
 136
 137 #define FIRST_MONTH     1
 138 #define LAST_MONTH      12
 139 #define MONTH_COUNT     (LAST_MONTH - FIRST_MONTH + 1)
 140
 141 /* note on DOW: 0 and 7 are both Sunday, for compatibility reasons. */
 142 #define FIRST_DOW       0
 143 #define LAST_DOW        7
 144 #define DOW_COUNT       (LAST_DOW - FIRST_DOW + 1)
 145
 146 #ifdef LOGIN_CAP
 147 /* see init.c */
 148 #define RESOURCE_RC "daemon"
 149 #endif
 150
 151                         /* each user's crontab will be held as a list of
 152                          * the following structure.
 153                          *
 154                          * These are the cron commands.
 155                          */
 156
 157 typedef struct _entry {
 158         struct _entry   *next;
 159         uid_t           uid;
 160         gid_t           gid;
 161 #ifdef LOGIN_CAP
 162         char            *class;
 163 #endif
 164         char            **envp;
 165         char            *cmd;
 166         bitstr_t        bit_decl(minute, MINUTE_COUNT);
 167         bitstr_t        bit_decl(hour,   HOUR_COUNT);
 168         bitstr_t        bit_decl(dom,    DOM_COUNT);
 169         bitstr_t        bit_decl(month,  MONTH_COUNT);
 170         bitstr_t        bit_decl(dow,    DOW_COUNT);
 171         int             flags;
 172 #define DOM_STAR        0x01
 173 #define DOW_STAR        0x02
 174 #define WHEN_REBOOT     0x04
 175 #define RUN_AT  0x08
 176 #define NOT_UNTIL       0x10
 177         time_t  lastrun;
 178 } entry;
 179
 180                         /* the crontab database will be a list of the
 181                          * following structure, one element per user
 182                          * plus one for the system.
 183                          *
 184                          * These are the crontabs.
 185                          */
 186
 187 typedef struct _user {
 188         struct _user    *next, *prev;   /* links */
 189         char            *name;
 190         time_t          mtime;          /* last modtime of crontab */
 191         entry           *crontab;       /* this person's crontab */
 192 } user;
 193
 194 typedef struct _cron_db {
 195         user            *head, *tail;   /* links */
 196         time_t          mtime;          /* last modtime on spooldir */
 197 } cron_db;
 198
 199
 200 void            set_cron_uid(void),
 201                 set_cron_cwd(void),
 202                 load_database(cron_db *),
 203                 open_logfile(void),
 204                 sigpipe_func(void),
 205                 job_add(entry *, user *),
 206                 do_command(entry *, user *),
 207                 link_user(cron_db *, user *),
 208                 unlink_user(cron_db *, user *),
 209                 free_user(user *),
 210                 env_free(char **),
 211                 unget_char(int, FILE *),
 212                 free_entry(entry *),
 213                 acquire_daemonlock(int),
 214                 skip_comments(FILE *),
 215                 log_it(char *, int, char *, char *),
 216                 log_close(void);
 217
 218 int             job_runqueue(void),
 219                 set_debug_flags(char *),
 220                 get_char(FILE *),
 221                 get_string(char *, int, FILE *, char *),
 222                 swap_uids(void),
 223                 load_env(char *, FILE *),
 224                 cron_pclose(FILE *),
 225                 strcmp_until(char *, char *, int),
 226                 allowed(char *),
 227                 strdtb(char *);
 228
 229 char            *env_get(char *, char **),
 230                 *arpadate(time_t *),
 231                 *mkprints(unsigned char *, unsigned int),
 232                 *first_word(char *, char *),
 233                 **env_init(void),
 234                 **env_copy(char **),
 235                 **env_set(char **, char *);
 236
 237 user            *load_user(int, struct passwd *, char *),
 238                 *find_user(cron_db *, char *);
 239
 240 entry           *load_entry(FILE *, void (*)(),
 241                                  struct passwd *, char **);
 242
 243 FILE            *cron_popen(char *, char *, entry *);
 244
 245
 246                                 /* in the C tradition, we only create
 247                                  * variables for the main program, just
 248                                  * extern them elsewhere.
 249                                  */
 250
 251 #ifdef MAIN_PROGRAM
 252 # if !defined(LINT) && !defined(lint)
 253 char    *copyright[] = {
 254                 "@(#) Copyright 1988,1989,1990,1993,1994 by Paul Vixie",
 255                 "@(#) All rights reserved"
 256         };
 257 # endif
 258
 259 char    *MonthNames[] = {
 260                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 261                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
 262                 NULL
 263         };
 264
 265 char    *DowNames[] = {
 266                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun",
 267                 NULL
 268         };
 269
 270 char    *ProgramName;
 271 int     LineNumber;
 272 unsigned Jitter,
 273         RootJitter;
 274 time_t  TargetTime;
 275
 276 # if DEBUGGING
 277 int     DebugFlags;
 278 char    *DebugFlagNames[] = {   /* sync with #defines */
 279                 "ext", "sch", "proc", "pars", "load", "misc", "test", "bit",
 280                 NULL            /* NULL must be last element */
 281         };
 282 # endif /* DEBUGGING */
 283 #else /*MAIN_PROGRAM*/
 284 extern  char    *copyright[],
 285                 *MonthNames[],
 286                 *DowNames[],
 287                 *ProgramName;
 288 extern  int     LineNumber;
 289 extern unsigned Jitter,
 290                 RootJitter;
 291 extern  time_t  TargetTime;
 292 # if DEBUGGING
 293 extern  int     DebugFlags;
 294 extern  char    *DebugFlagNames[];
 295 # endif /* DEBUGGING */
 296 #endif /*MAIN_PROGRAM*/