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merge common code from dmf and dmz drivers
[unix-history] / usr / src / usr.sbin / cron / cron.c
diff --git a/usr/src/usr.sbin/cron/cron.c b/usr/src/usr.sbin/cron/cron.c
index 8f28777..cd58001 100644 (file)
--- a/usr/src/usr.sbin/cron/cron.c
+++ b/usr/src/usr.sbin/cron/cron.c
@@ -1,61 +1,115 @@
-static char *sccsid = "@(#)cron.c      4.4 (Berkeley) %G%";
+#ifndef lint
+static char *sccsid = "@(#)cron.c      4.12 (Berkeley) %G%";
+#endif
+
 #include <sys/types.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <signal.h>
-#include <time.h>
+#include <sys/time.h>
 #include <sys/stat.h>
 #include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/ioctl.h>
+#include <sys/file.h>
+#include <pwd.h>
+#include <fcntl.h>
+
+#define        LISTS   (2*BUFSIZ)
+#define        MAXLIN  BUFSIZ
+
+#ifndef CRONTAB
+#define CRONTAB "/usr/lib/crontab"
+#endif
 
 
-#define        LISTS   BUFSIZ
+#ifndef CRONTABLOC
+#define CRONTABLOC  "/usr/lib/crontab.local"
+#endif
 
 #define        EXACT   100
 #define        ANY     101
 #define        LIST    102
 #define        RANGE   103
 #define        EOS     104
 
 #define        EXACT   100
 #define        ANY     101
 #define        LIST    102
 #define        RANGE   103
 #define        EOS     104
-char   crontab[]       = "/usr/lib/crontab";
+
+char   crontab[]       = CRONTAB;
+char   loc_crontab[]   = CRONTABLOC;
 time_t itime;
 struct tm *loct;
 struct tm *localtime();
 char   *malloc();
 char   *realloc();
 time_t itime;
 struct tm *loct;
 struct tm *localtime();
 char   *malloc();
 char   *realloc();
+int    reapchild();
 int    flag;
 char   *list;
 int    flag;
 char   *list;
+char   *listend;
 unsigned listsize;
 
 unsigned listsize;
 
-main()
+FILE   *debug;
+#define dprintf if (debug) fprintf
+
+main(argc, argv)
+       int argc;
+       char **argv;
 {
        register char *cp;
        char *cmp();
        time_t filetime = 0;
 {
        register char *cp;
        char *cmp();
        time_t filetime = 0;
+       time_t lfiletime = 0;
+       char c;
+       extern char *optarg;
 
 
-     /*        setuid(1); */
        if (fork())
                exit(0);
        if (fork())
                exit(0);
+       c = getopt(argc, argv, "d:");
+       if (c == 'd') {
+               debug = fopen(optarg, "w");
+               if (debug == NULL)
+                       exit(1);
+               fcntl(fileno(debug), F_SETFL, FAPPEND);
+       }
        chdir("/");
        chdir("/");
-       freopen(crontab, "r", stdin);
        freopen("/", "r", stdout);
        freopen("/", "r", stderr);
        freopen("/", "r", stdout);
        freopen("/", "r", stderr);
+       untty();
        signal(SIGHUP, SIG_IGN);
        signal(SIGINT, SIG_IGN);
        signal(SIGQUIT, SIG_IGN);
        signal(SIGHUP, SIG_IGN);
        signal(SIGINT, SIG_IGN);
        signal(SIGQUIT, SIG_IGN);
+       signal(SIGCHLD, reapchild);
        time(&itime);
        itime -= localtime(&itime)->tm_sec;
        time(&itime);
        itime -= localtime(&itime)->tm_sec;
-       fclose(stdin);
 
        for (;; itime+=60, slp()) {
 
        for (;; itime+=60, slp()) {
-               struct stat cstat;
-
-               if (stat(crontab, &cstat) == -1)
-                       continue;
-               if (cstat.st_mtime > filetime) {
+               struct stat cstat, lcstat;
+               int newcron, newloc;
+               
+               newcron = 0;
+               if (stat(crontab, &cstat) < 0)
+                   cstat.st_mtime = 1;
+               if (cstat.st_mtime != filetime) {
                        filetime = cstat.st_mtime;
                        filetime = cstat.st_mtime;
+                       newcron++;
+               }
+
+               newloc  = 0;
+               if (stat(loc_crontab, &lcstat) < 0)
+                   lcstat.st_mtime = 1;
+               if (lcstat.st_mtime != lfiletime) {
+                       lfiletime = lcstat.st_mtime;
+                       newloc++;
+               }
+
+               if (newcron || newloc) {
                        init();
                        init();
+                       append(crontab);
+                       append(loc_crontab);
+                       *listend++ = EOS;
+                       *listend++ = EOS;
                }
                }
+
                loct = localtime(&itime);
                loct->tm_mon++;          /* 1-12 for month */
                loct = localtime(&itime);
                loct->tm_mon++;          /* 1-12 for month */
-               if (loct->tm_day == 0)
-                       loct->tm_day == 7;      /* sunday is 7, not 0 */
+               if (loct->tm_wday == 0)
+                       loct->tm_wday = 7;      /* sunday is 7, not 0 */
                for(cp = list; *cp != EOS;) {
                        flag = 0;
                        cp = cmp(cp, loct->tm_min);
                for(cp = list; *cp != EOS;) {
                        flag = 0;
                        cp = cmp(cp, loct->tm_min);
@@ -128,42 +182,67 @@ ex(s)
 char *s;
 {
        int st;
 char *s;
 {
        int st;
+       register struct passwd *pwd;
+       char user[BUFSIZ];
+       char *c = user;
+       int pid;
 
 
-       if(fork()) {
-               wait(&st);
+       if (fork()) {
                return;
        }
                return;
        }
-       if(fork())
-               exit(0);
+
+       pid = getpid();
+       while(*s != ' ' && *s != '\t')
+               *c++ = *s++;
+       *c = '\0';
+       s++;
+       if ((pwd = getpwnam(user)) == NULL) {
+               dprintf(debug, "%d: cannot find %s\n", pid, user),
+                       fflush(debug);
+               exit(1);
+       }
+       (void) setgid(pwd->pw_gid);
+       initgroups(pwd->pw_name, pwd->pw_gid);
+       (void) setuid(pwd->pw_uid);
        freopen("/", "r", stdin);
        freopen("/", "r", stdin);
+       dprintf(debug, "%d: executing %s", pid, s), fflush (debug);
        execl("/bin/sh", "sh", "-c", s, 0);
        execl("/bin/sh", "sh", "-c", s, 0);
+       dprintf(debug, "%d: cannot execute sh\n", pid), fflush (debug);
        exit(0);
 }
 
 init()
        exit(0);
 }
 
 init()
+{
+       /*
+        * Don't free in case was longer than LISTS.  Trades off
+        * the rare case of crontab shrinking vs. the common case of
+        * extra realloc's needed in append() for a large crontab.
+        */
+       if (list == 0) {
+               list = malloc(LISTS);
+               listsize = LISTS;
+       }
+       listend = list;
+}
+
+append(fn)
+char *fn;
 {
        register i, c;
        register char *cp;
        register char *ocp;
        register int n;
 
 {
        register i, c;
        register char *cp;
        register char *ocp;
        register int n;
 
-       freopen(crontab, "r", stdin);
-       if (list) {
-               free(list);
-               list = realloc(list, LISTS);
-       } else
-               list = malloc(LISTS);
-       listsize = LISTS;
-       cp = list;
-
+       if (freopen(fn, "r", stdin) == NULL)
+               return;
+       cp = listend;
 loop:
 loop:
-       if(cp > list+listsize-BUFSIZ) {
-               char *olist;
+       if(cp > list+listsize-MAXLIN) {
+               int length = cp - list;
+
                listsize += LISTS;
                listsize += LISTS;
-               olist = list;
-               free(list);
                list = realloc(list, listsize);
                list = realloc(list, listsize);
-               cp = list + (cp - olist);
+               cp = list + length;
        }
        ocp = cp;
        for(i=0;; i++) {
        }
        ocp = cp;
        for(i=0;; i++) {
@@ -232,9 +311,8 @@ ignore:
        cp = ocp;
        while(c != '\n') {
                if(c == EOF) {
        cp = ocp;
        while(c != '\n') {
                if(c == EOF) {
-                       *cp++ = EOS;
-                       *cp++ = EOS;
                        fclose(stdin);
                        fclose(stdin);
+                       listend = cp;
                        return;
                }
                c = getchar();
                        return;
                }
                c = getchar();
@@ -252,7 +330,29 @@ register c;
                c = getchar();
        }
        ungetc(c, stdin);
                c = getchar();
        }
        ungetc(c, stdin);
-       if (n>100)
+       if (n>=100)
                return(-1);
        return(n);
 }
                return(-1);
        return(n);
 }
+
+reapchild()
+{
+       union wait status;
+       int pid;
+
+       while ((pid = wait3(&status, WNOHANG, 0)) > 0)
+               dprintf(debug, "%d: child exits with signal %d status %d\n",
+                       pid, status.w_termsig, status.w_retcode),
+                       fflush (debug);
+}
+
+untty()
+{
+       int i;
+
+       i = open("/dev/tty", O_RDWR);
+       if (i >= 0) {
+               ioctl(i, TIOCNOTTY, (char *)0);
+               (void) close(i);
+       }
+}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.