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https://github.com/sheumann/hush.git
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1145 lines
22 KiB
C
1145 lines
22 KiB
C
/*
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* crond -d[#] -c <crondir> -f -b
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*
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* run as root, but NOT setuid root
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*
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* Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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* May be distributed under the GNU General Public License
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*
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* Vladimir Oleynik <dzo@simtreas.ru> (C) 2002 to be used in busybox
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*/
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#define VERSION "2.3.2"
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#undef FEATURE_DEBUG_OPT
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <signal.h>
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#include <getopt.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/resource.h>
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#include "busybox.h"
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#define arysize(ary) (sizeof(ary)/sizeof((ary)[0]))
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#ifndef CRONTABS
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#define CRONTABS "/var/spool/cron/crontabs"
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#endif
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#ifndef TMPDIR
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#define TMPDIR "/var/spool/cron"
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#endif
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#ifndef LOG_FILE
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#define LOG_FILE "/var/log/cron"
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#endif
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#ifndef SENDMAIL
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#define SENDMAIL "/usr/sbin/sendmail"
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#endif
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#ifndef SENDMAIL_ARGS
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#define SENDMAIL_ARGS "-t", "-oem", "-i"
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#endif
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#ifndef CRONUPDATE
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#define CRONUPDATE "cron.update"
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#endif
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#ifndef MAXLINES
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#define MAXLINES 256 /* max lines in non-root crontabs */
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#endif
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typedef struct CronFile {
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struct CronFile *cf_Next;
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struct CronLine *cf_LineBase;
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char *cf_User; /* username */
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int cf_Ready; /* bool: one or more jobs ready */
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int cf_Running; /* bool: one or more jobs running */
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int cf_Deleted; /* marked for deletion, ignore */
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} CronFile;
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typedef struct CronLine {
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struct CronLine *cl_Next;
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char *cl_Shell; /* shell command */
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int cl_Pid; /* running pid, 0, or armed (-1) */
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int cl_MailFlag; /* running pid is for mail */
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int cl_MailPos; /* 'empty file' size */
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char cl_Mins[60]; /* 0-59 */
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char cl_Hrs[24]; /* 0-23 */
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char cl_Days[32]; /* 1-31 */
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char cl_Mons[12]; /* 0-11 */
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char cl_Dow[7]; /* 0-6, beginning sunday */
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} CronLine;
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#define RUN_RANOUT 1
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#define RUN_RUNNING 2
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#define RUN_FAILED 3
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#define DaemonUid 0
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#ifdef FEATURE_DEBUG_OPT
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static short DebugOpt;
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#endif
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static short LogLevel = 8;
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static short ForegroundOpt;
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static short LoggerOpt;
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static const char *LogFile = LOG_FILE;
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static const char *CDir = CRONTABS;
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static void log(int level, const char *ctl, ...);
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static void log9(const char *ctl, ...);
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static void startlogger(void);
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static void CheckUpdates(void);
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static void SynchronizeDir(void);
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static int TestJobs(time_t t1, time_t t2);
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static void RunJobs(void);
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static int CheckJobs(void);
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static void RunJob(CronFile *file, CronLine *line);
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static void EndJob(const CronFile *file, CronLine *line);
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static void DeleteFile(const char *userName);
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static CronFile *FileBase;
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int
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crond_main(int ac, char **av)
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{
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int i;
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opterr = 0; /* disable getopt 'errors' message.*/
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while ((i = getopt(ac,av,
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#ifdef FEATURE_DEBUG_OPT
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"d:"
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#endif
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"l:L:fbSc:")) != EOF){
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switch (i){
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case 'l':
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LogLevel = atoi(optarg);
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break;
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#ifdef FEATURE_DEBUG_OPT
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case 'd':
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DebugOpt = atoi(optarg);
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LogLevel = 0;
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break;
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#endif
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case 'f':
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ForegroundOpt = 1;
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break;
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case 'b':
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ForegroundOpt = 0;
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break;
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case 'S': /* select logging to syslog */
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LoggerOpt = 0;
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break;
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case 'L': /* select internal file logger */
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LoggerOpt = 1;
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if (*optarg != 0) LogFile = optarg;
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break;
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case 'c':
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if (*optarg != 0) CDir = optarg;
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break;
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default: /* parse error */
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bb_show_usage();
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}
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}
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/*
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* change directory
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*/
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if (chdir(CDir) != 0)
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bb_perror_msg_and_die("chdir");
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/*
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* close stdin and stdout, stderr.
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* close unused descriptors - don't need.
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* optional detach from controlling terminal
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*/
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if (ForegroundOpt == 0) {
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if(daemon(1, 0) < 0)
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bb_perror_msg_and_die("daemon");
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}
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(void)startlogger(); /* need if syslog mode selected */
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signal(SIGHUP,SIG_IGN); /* hmm.. but, if kill -HUP original
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* version - his died. ;(
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*/
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/*
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* main loop - synchronize to 1 second after the minute, minimum sleep
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* of 1 second.
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*/
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log(9,"%s " VERSION " dillon, started, log level %d\n", av[0], LogLevel);
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SynchronizeDir();
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{
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time_t t1 = time(NULL);
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time_t t2;
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long dt;
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short rescan = 60;
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short sleep_time = 60;
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for (;;) {
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sleep((sleep_time + 1) - (short)(time(NULL) % sleep_time));
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t2 = time(NULL);
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dt = t2 - t1;
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/*
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* The file 'cron.update' is checked to determine new cron
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* jobs. The directory is rescanned once an hour to deal
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* with any screwups.
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*
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* check for disparity. Disparities over an hour either way
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* result in resynchronization. A reverse-indexed disparity
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* less then an hour causes us to effectively sleep until we
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* match the original time (i.e. no re-execution of jobs that
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* have just been run). A forward-indexed disparity less then
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* an hour causes intermediate jobs to be run, but only once
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* in the worst case.
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*
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* when running jobs, the inequality used is greater but not
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* equal to t1, and less then or equal to t2.
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*/
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if (--rescan == 0) {
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rescan = 60;
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SynchronizeDir();
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}
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CheckUpdates();
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#ifdef FEATURE_DEBUG_OPT
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if (DebugOpt)
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log(5, "Wakeup dt=%d\n", dt);
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#endif
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if (dt < -60*60 || dt > 60*60) {
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t1 = t2;
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log9("time disparity of %d minutes detected\n", dt / 60);
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} else if (dt > 0) {
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TestJobs(t1, t2);
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RunJobs();
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sleep(5);
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if (CheckJobs() > 0)
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sleep_time = 10;
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else
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sleep_time = 60;
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t1 = t2;
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}
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}
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}
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/* not reached */
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}
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static void
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vlog(int level, int MLOG_LEVEL, const char *ctl, va_list va)
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{
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char buf[1024];
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int logfd;
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if (level >= LogLevel) {
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vsnprintf(buf,sizeof(buf), ctl, va);
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#ifdef FEATURE_DEBUG_OPT
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if (DebugOpt) fprintf(stderr,"%s",buf);
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else
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#endif
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if (LoggerOpt == 0) syslog(MLOG_LEVEL, "%s", buf);
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else {
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if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0){
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write(logfd, buf, strlen(buf));
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close(logfd);
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} else
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#ifdef FEATURE_DEBUG_OPT
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bb_perror_msg("Can't open log file")
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#endif
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;
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}
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}
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}
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/*
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set log_level=9 and log messages
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*/
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static void
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log9(const char *ctl, ...)
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{
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va_list va;
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va_start(va, ctl);
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vlog(9, LOG_WARNING, ctl, va);
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va_end(va);
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}
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/*
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normal logger call point.
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*/
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static void
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log(int level, const char *ctl, ...)
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{
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va_list va;
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va_start(va, ctl);
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vlog(level, LOG_NOTICE, ctl, va);
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va_end(va);
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}
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/*
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Original: void
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logfd(int fd, const char *ctl, ...)
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Updated to: log_error (used by jobs.c)
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*/
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static void
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log_err(const char *ctl, ...)
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{
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va_list va;
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va_start(va, ctl);
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vlog(20, LOG_ERR, ctl, va);
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va_end(va);
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}
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/*
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used by jobs.c (write to temp file..)
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*/
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static void
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fdprintf(int fd, const char *ctl, ...)
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{
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va_list va;
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va_start(va, ctl);
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vdprintf(fd, ctl, va);
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va_end(va);
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}
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static int
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ChangeUser(const char *user, short dochdir)
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{
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struct passwd *pas;
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/*
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* Obtain password entry and change privilages
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*/
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if ((pas = getpwnam(user)) == 0) {
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log(9, "failed to get uid for %s", user);
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return(-1);
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}
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setenv("USER", pas->pw_name, 1);
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setenv("HOME", pas->pw_dir, 1);
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setenv("SHELL", "/bin/sh", 1);
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/*
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* Change running state to the user in question
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*/
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if (initgroups(user, pas->pw_gid) < 0) {
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log(9, "initgroups failed: %s %m", user);
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return(-1);
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}
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if (setregid(pas->pw_gid, pas->pw_gid) < 0) {
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log(9, "setregid failed: %s %d", user, pas->pw_gid);
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return(-1);
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}
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if (setreuid(pas->pw_uid, pas->pw_uid) < 0) {
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log(9, "setreuid failed: %s %d", user, pas->pw_uid);
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return(-1);
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}
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if (dochdir) {
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if (chdir(pas->pw_dir) < 0) {
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log(8, "chdir failed: %s %s", user, pas->pw_dir);
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if (chdir(TMPDIR) < 0) {
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log(9, "chdir failed: %s %s", TMPDIR, user);
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return(-1);
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}
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}
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}
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return(pas->pw_uid);
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}
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static void
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startlogger(void)
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{
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int logfd;
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if (LoggerOpt == 0)
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openlog(bb_applet_name, LOG_CONS|LOG_PID,LOG_CRON);
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else { /* test logfile */
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if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0)
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close(logfd);
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else
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#ifdef FEATURE_DEBUG_OPT
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printf("Failed to open log file '%s' reason: %m", LogFile)
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#endif
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;
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}
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}
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static const char * const DowAry[] = {
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"sun",
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"mon",
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"tue",
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"wed",
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"thu",
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"fri",
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"sat",
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"Sun",
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"Mon",
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"Tue",
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"Wed",
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"Thu",
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"Fri",
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"Sat",
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NULL
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};
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static const char * const MonAry[] = {
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"jan",
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"feb",
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"mar",
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"apr",
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"may",
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"jun",
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"jul",
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"aug",
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"sep",
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"oct",
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"nov",
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"dec",
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec",
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NULL
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};
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static char *
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ParseField(char *user, char *ary, int modvalue, int off,
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const char * const *names, char *ptr)
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{
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char *base = ptr;
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int n1 = -1;
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int n2 = -1;
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if (base == NULL)
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return(NULL);
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while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
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int skip = 0;
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/*
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* Handle numeric digit or symbol or '*'
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*/
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if (*ptr == '*') {
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n1 = 0; /* everything will be filled */
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n2 = modvalue - 1;
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skip = 1;
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++ptr;
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} else if (*ptr >= '0' && *ptr <= '9') {
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if (n1 < 0)
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n1 = strtol(ptr, &ptr, 10) + off;
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else
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n2 = strtol(ptr, &ptr, 10) + off;
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skip = 1;
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} else if (names) {
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int i;
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for (i = 0; names[i]; ++i) {
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if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
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break;
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}
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}
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if (names[i]) {
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ptr += strlen(names[i]);
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if (n1 < 0)
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n1 = i;
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else
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n2 = i;
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skip = 1;
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}
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}
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/*
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* handle optional range '-'
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*/
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if (skip == 0) {
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log9("failed user %s parsing %s\n", user, base);
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return(NULL);
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}
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if (*ptr == '-' && n2 < 0) {
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++ptr;
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continue;
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}
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/*
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* collapse single-value ranges, handle skipmark, and fill
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* in the character array appropriately.
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*/
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if (n2 < 0)
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n2 = n1;
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if (*ptr == '/')
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skip = strtol(ptr + 1, &ptr, 10);
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/*
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* fill array, using a failsafe is the easiest way to prevent
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* an endless loop
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*/
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{
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int s0 = 1;
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int failsafe = 1024;
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--n1;
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do {
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n1 = (n1 + 1) % modvalue;
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if (--s0 == 0) {
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ary[n1 % modvalue] = 1;
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s0 = skip;
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}
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} while (n1 != n2 && --failsafe);
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if (failsafe == 0) {
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log9("failed user %s parsing %s\n", user, base);
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return(NULL);
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}
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}
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if (*ptr != ',')
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break;
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++ptr;
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n1 = -1;
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n2 = -1;
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}
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if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
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log9("failed user %s parsing %s\n", user, base);
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return(NULL);
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}
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while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')
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++ptr;
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#ifdef FEATURE_DEBUG_OPT
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if (DebugOpt) {
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int i;
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for (i = 0; i < modvalue; ++i)
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log(5, "%d", ary[i]);
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log(5, "\n");
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}
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#endif
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return(ptr);
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}
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static void
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FixDayDow(CronLine *line)
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{
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short i;
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short weekUsed = 0;
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short daysUsed = 0;
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for (i = 0; i < arysize(line->cl_Dow); ++i) {
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if (line->cl_Dow[i] == 0) {
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weekUsed = 1;
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break;
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}
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}
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for (i = 0; i < arysize(line->cl_Days); ++i) {
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if (line->cl_Days[i] == 0) {
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daysUsed = 1;
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break;
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}
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}
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if (weekUsed && !daysUsed) {
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memset(line->cl_Days, 0, sizeof(line->cl_Days));
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}
|
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if (daysUsed && !weekUsed) {
|
|
memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
SynchronizeFile(const char *fileName)
|
|
{
|
|
int maxEntries = MAXLINES;
|
|
int maxLines;
|
|
char buf[1024];
|
|
|
|
if (strcmp(fileName, "root") == 0)
|
|
maxEntries = 65535;
|
|
maxLines = maxEntries * 10;
|
|
|
|
if (fileName) {
|
|
FILE *fi;
|
|
|
|
DeleteFile(fileName);
|
|
|
|
if ((fi = fopen(fileName, "r")) != NULL) {
|
|
struct stat sbuf;
|
|
|
|
if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
|
|
CronFile *file = calloc(1, sizeof(CronFile));
|
|
CronLine **pline;
|
|
|
|
file->cf_User = strdup(fileName);
|
|
pline = &file->cf_LineBase;
|
|
|
|
while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
|
|
CronLine line;
|
|
char *ptr;
|
|
|
|
if (buf[0])
|
|
buf[strlen(buf)-1] = 0;
|
|
|
|
if (buf[0] == 0 || buf[0] == '#' || buf[0] == ' ' || buf[0] == '\t')
|
|
continue;
|
|
|
|
if (--maxEntries == 0)
|
|
break;
|
|
|
|
memset(&line, 0, sizeof(line));
|
|
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt)
|
|
log9("User %s Entry %s\n", fileName, buf);
|
|
#endif
|
|
|
|
/*
|
|
* parse date ranges
|
|
*/
|
|
|
|
ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
|
|
ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
|
|
ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
|
|
ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
|
|
ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);
|
|
|
|
/*
|
|
* check failure
|
|
*/
|
|
|
|
if (ptr == NULL)
|
|
continue;
|
|
|
|
/*
|
|
* fix days and dow - if one is not * and the other
|
|
* is *, the other is set to 0, and vise-versa
|
|
*/
|
|
|
|
FixDayDow(&line);
|
|
|
|
*pline = calloc(1, sizeof(CronLine));
|
|
**pline = line;
|
|
|
|
/*
|
|
* copy command
|
|
*/
|
|
|
|
(*pline)->cl_Shell = strdup(ptr);
|
|
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt) {
|
|
log9(" Command %s\n", ptr);
|
|
}
|
|
#endif
|
|
|
|
pline = &((*pline)->cl_Next);
|
|
}
|
|
*pline = NULL;
|
|
|
|
file->cf_Next = FileBase;
|
|
FileBase = file;
|
|
|
|
if (maxLines == 0 || maxEntries == 0)
|
|
log9("Maximum number of lines reached for user %s\n", fileName);
|
|
}
|
|
fclose(fi);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
CheckUpdates(void)
|
|
{
|
|
FILE *fi;
|
|
char buf[256];
|
|
|
|
if ((fi = fopen(CRONUPDATE, "r")) != NULL) {
|
|
remove(CRONUPDATE);
|
|
while (fgets(buf, sizeof(buf), fi) != NULL) {
|
|
SynchronizeFile(strtok(buf, " \t\r\n"));
|
|
}
|
|
fclose(fi);
|
|
}
|
|
}
|
|
|
|
static void
|
|
SynchronizeDir(void)
|
|
{
|
|
/*
|
|
* Attempt to delete the database. Note that we have to make a copy
|
|
* of the string
|
|
*/
|
|
|
|
for (;;) {
|
|
CronFile *file;
|
|
char *user;
|
|
|
|
for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next)
|
|
;
|
|
if (file == NULL)
|
|
break;
|
|
user = strdup(file->cf_User);
|
|
DeleteFile(user);
|
|
free(user);
|
|
}
|
|
|
|
/*
|
|
* Remove cron update file
|
|
*
|
|
* Re-chdir, in case directory was renamed & deleted, or otherwise
|
|
* screwed up.
|
|
*
|
|
* scan directory and add associated users
|
|
*/
|
|
|
|
remove(CRONUPDATE);
|
|
if (chdir(CDir) < 0) {
|
|
log9("unable to find %s\n", CDir);
|
|
exit(20);
|
|
}
|
|
{
|
|
DIR *dir;
|
|
struct dirent *den;
|
|
|
|
if ((dir = opendir("."))) {
|
|
while ((den = readdir(dir))) {
|
|
if (strchr(den->d_name, '.') != NULL)
|
|
continue;
|
|
if (getpwnam(den->d_name))
|
|
SynchronizeFile(den->d_name);
|
|
else
|
|
log(7, "ignoring %s\n", den->d_name);
|
|
}
|
|
closedir(dir);
|
|
} else {
|
|
log9("Unable to open current dir!\n");
|
|
exit(20);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* DeleteFile() - delete user database
|
|
*
|
|
* Note: multiple entries for same user may exist if we were unable to
|
|
* completely delete a database due to running processes.
|
|
*/
|
|
|
|
static void
|
|
DeleteFile(const char *userName)
|
|
{
|
|
CronFile **pfile = &FileBase;
|
|
CronFile *file;
|
|
|
|
while ((file = *pfile) != NULL) {
|
|
if (strcmp(userName, file->cf_User) == 0) {
|
|
CronLine **pline = &file->cf_LineBase;
|
|
CronLine *line;
|
|
|
|
file->cf_Running = 0;
|
|
file->cf_Deleted = 1;
|
|
|
|
while ((line = *pline) != NULL) {
|
|
if (line->cl_Pid > 0) {
|
|
file->cf_Running = 1;
|
|
pline = &line->cl_Next;
|
|
} else {
|
|
*pline = line->cl_Next;
|
|
free(line->cl_Shell);
|
|
free(line);
|
|
}
|
|
}
|
|
if (file->cf_Running == 0) {
|
|
*pfile = file->cf_Next;
|
|
free(file->cf_User);
|
|
free(file);
|
|
} else {
|
|
pfile = &file->cf_Next;
|
|
}
|
|
} else {
|
|
pfile = &file->cf_Next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* TestJobs()
|
|
*
|
|
* determine which jobs need to be run. Under normal conditions, the
|
|
* period is about a minute (one scan). Worst case it will be one
|
|
* hour (60 scans).
|
|
*/
|
|
|
|
static int
|
|
TestJobs(time_t t1, time_t t2)
|
|
{
|
|
short nJobs = 0;
|
|
time_t t;
|
|
|
|
/*
|
|
* Find jobs > t1 and <= t2
|
|
*/
|
|
|
|
for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
|
if (t > t1) {
|
|
struct tm *tp = localtime(&t);
|
|
CronFile *file;
|
|
CronLine *line;
|
|
|
|
for (file = FileBase; file; file = file->cf_Next) {
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt)
|
|
log(5, "FILE %s:\n", file->cf_User);
|
|
#endif
|
|
if (file->cf_Deleted)
|
|
continue;
|
|
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt)
|
|
log(5, " LINE %s\n", line->cl_Shell);
|
|
#endif
|
|
if (line->cl_Mins[tp->tm_min] &&
|
|
line->cl_Hrs[tp->tm_hour] &&
|
|
(line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday]) &&
|
|
line->cl_Mons[tp->tm_mon]
|
|
) {
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt)
|
|
log(5, " JobToDo: %d %s\n", line->cl_Pid, line->cl_Shell);
|
|
#endif
|
|
if (line->cl_Pid > 0) {
|
|
log(8, " process already running: %s %s\n",
|
|
file->cf_User,
|
|
line->cl_Shell
|
|
);
|
|
} else if (line->cl_Pid == 0) {
|
|
line->cl_Pid = -1;
|
|
file->cf_Ready = 1;
|
|
++nJobs;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return(nJobs);
|
|
}
|
|
|
|
static void
|
|
RunJobs(void)
|
|
{
|
|
CronFile *file;
|
|
CronLine *line;
|
|
|
|
for (file = FileBase; file; file = file->cf_Next) {
|
|
if (file->cf_Ready) {
|
|
file->cf_Ready = 0;
|
|
|
|
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
|
if (line->cl_Pid < 0) {
|
|
|
|
RunJob(file, line);
|
|
|
|
log(8, "USER %s pid %3d cmd %s\n",
|
|
file->cf_User,
|
|
line->cl_Pid,
|
|
line->cl_Shell
|
|
);
|
|
if (line->cl_Pid < 0)
|
|
file->cf_Ready = 1;
|
|
else if (line->cl_Pid > 0)
|
|
file->cf_Running = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CheckJobs() - check for job completion
|
|
*
|
|
* Check for job completion, return number of jobs still running after
|
|
* all done.
|
|
*/
|
|
|
|
static int
|
|
CheckJobs(void)
|
|
{
|
|
CronFile *file;
|
|
CronLine *line;
|
|
int nStillRunning = 0;
|
|
|
|
for (file = FileBase; file; file = file->cf_Next) {
|
|
if (file->cf_Running) {
|
|
file->cf_Running = 0;
|
|
|
|
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
|
if (line->cl_Pid > 0) {
|
|
int status;
|
|
int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);
|
|
|
|
if (r < 0 || r == line->cl_Pid) {
|
|
EndJob(file, line);
|
|
if (line->cl_Pid)
|
|
file->cf_Running = 1;
|
|
} else if (r == 0) {
|
|
file->cf_Running = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
nStillRunning += file->cf_Running;
|
|
}
|
|
return(nStillRunning);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
RunJob(CronFile *file, CronLine *line)
|
|
{
|
|
char mailFile[128];
|
|
int mailFd;
|
|
|
|
line->cl_Pid = 0;
|
|
line->cl_MailFlag = 0;
|
|
|
|
/*
|
|
* open mail file - owner root so nobody can screw with it.
|
|
*/
|
|
|
|
snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d",
|
|
file->cf_User, getpid());
|
|
mailFd = open(mailFile, O_CREAT|O_TRUNC|O_WRONLY|O_EXCL|O_APPEND, 0600);
|
|
|
|
if (mailFd >= 0) {
|
|
line->cl_MailFlag = 1;
|
|
fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n",
|
|
file->cf_User,
|
|
line->cl_Shell
|
|
);
|
|
line->cl_MailPos = lseek(mailFd, 0, 1);
|
|
}
|
|
|
|
/*
|
|
* Fork as the user in question and run program
|
|
*/
|
|
|
|
if ((line->cl_Pid = fork()) == 0) {
|
|
/*
|
|
* CHILD, FORK OK
|
|
*/
|
|
|
|
/*
|
|
* Change running state to the user in question
|
|
*/
|
|
|
|
if (ChangeUser(file->cf_User, 1) < 0)
|
|
return;
|
|
|
|
#ifdef FEATURE_DEBUG_OPT
|
|
if (DebugOpt)
|
|
log(5, "Child Running %s\n", line->cl_Shell);
|
|
#endif
|
|
|
|
/*
|
|
* stdin is already /dev/null, setup stdout and stderr
|
|
*/
|
|
|
|
if (mailFd >= 0) {
|
|
dup2(mailFd, 1);
|
|
dup2(mailFd, 2);
|
|
close(mailFd);
|
|
} else {
|
|
log_err("unable to create mail file user %s file %s, output to /dev/null\n",
|
|
file->cf_User,
|
|
mailFile
|
|
);
|
|
}
|
|
execl("/bin/sh", "/bin/sh", "-c", line->cl_Shell, NULL, NULL);
|
|
log_err("unable to exec, user %s cmd /bin/sh -c %s\n",
|
|
file->cf_User,
|
|
line->cl_Shell
|
|
);
|
|
fdprintf(1, "Exec failed: /bin/sh -c %s\n", line->cl_Shell);
|
|
exit(0);
|
|
} else if (line->cl_Pid < 0) {
|
|
/*
|
|
* PARENT, FORK FAILED
|
|
*/
|
|
log_err("couldn't fork, user %s\n", file->cf_User);
|
|
line->cl_Pid = 0;
|
|
remove(mailFile);
|
|
} else {
|
|
/*
|
|
* PARENT, FORK SUCCESS
|
|
*
|
|
* rename mail-file based on pid of process
|
|
*/
|
|
char mailFile2[128];
|
|
|
|
snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d",
|
|
file->cf_User, line->cl_Pid);
|
|
rename(mailFile, mailFile2);
|
|
}
|
|
|
|
/*
|
|
* Close the mail file descriptor.. we can't just leave it open in
|
|
* a structure, closing it later, because we might run out of descriptors
|
|
*/
|
|
|
|
if (mailFd >= 0)
|
|
close(mailFd);
|
|
}
|
|
|
|
/*
|
|
* EndJob - called when job terminates and when mail terminates
|
|
*/
|
|
|
|
static void
|
|
EndJob(const CronFile *file, CronLine *line)
|
|
{
|
|
int mailFd;
|
|
char mailFile[128];
|
|
struct stat sbuf;
|
|
|
|
/*
|
|
* No job
|
|
*/
|
|
|
|
if (line->cl_Pid <= 0) {
|
|
line->cl_Pid = 0;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* End of job and no mail file
|
|
* End of sendmail job
|
|
*/
|
|
|
|
snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d",
|
|
file->cf_User, line->cl_Pid);
|
|
line->cl_Pid = 0;
|
|
|
|
if (line->cl_MailFlag != 1)
|
|
return;
|
|
|
|
line->cl_MailFlag = 0;
|
|
|
|
/*
|
|
* End of primary job - check for mail file. If size has increased and
|
|
* the file is still valid, we sendmail it.
|
|
*/
|
|
|
|
mailFd = open(mailFile, O_RDONLY);
|
|
remove(mailFile);
|
|
if (mailFd < 0) {
|
|
return;
|
|
}
|
|
|
|
if (fstat(mailFd, &sbuf) < 0 ||
|
|
sbuf.st_uid != DaemonUid ||
|
|
sbuf.st_nlink != 0 ||
|
|
sbuf.st_size == line->cl_MailPos ||
|
|
!S_ISREG(sbuf.st_mode)
|
|
) {
|
|
close(mailFd);
|
|
return;
|
|
}
|
|
|
|
if ((line->cl_Pid = fork()) == 0) {
|
|
/*
|
|
* CHILD, FORK OK
|
|
*/
|
|
|
|
/*
|
|
* change user id - no way in hell security can be compromised
|
|
* by the mailing and we already verified the mail file.
|
|
*/
|
|
|
|
if (ChangeUser(file->cf_User, 1) < 0)
|
|
exit(0);
|
|
|
|
/*
|
|
* run sendmail with mail file as standard input, only if
|
|
* mail file exists!
|
|
*/
|
|
|
|
dup2(mailFd, 0);
|
|
dup2(1, 2);
|
|
close(mailFd);
|
|
|
|
execl(SENDMAIL, SENDMAIL, SENDMAIL_ARGS, NULL, NULL);
|
|
log_err("unable to exec %s %s, user %s, output to sink null",
|
|
SENDMAIL,
|
|
SENDMAIL_ARGS,
|
|
file->cf_User
|
|
);
|
|
exit(0);
|
|
} else if (line->cl_Pid < 0) {
|
|
/*
|
|
* PARENT, FORK FAILED
|
|
*/
|
|
log_err("unable to fork, user %s", file->cf_User);
|
|
line->cl_Pid = 0;
|
|
} else {
|
|
/*
|
|
* PARENT, FORK OK
|
|
*/
|
|
}
|
|
close(mailFd);
|
|
}
|