aboutsummaryrefslogtreecommitdiff
path: root/miscutils/crond.c
diff options
context:
space:
mode:
Diffstat (limited to 'miscutils/crond.c')
-rw-r--r--miscutils/crond.c1146
1 files changed, 1146 insertions, 0 deletions
diff --git a/miscutils/crond.c b/miscutils/crond.c
new file mode 100644
index 000000000..225d5026c
--- /dev/null
+++ b/miscutils/crond.c
@@ -0,0 +1,1146 @@
+/*
+ * crond -d[#] -c <crondir> -f -b
+ *
+ * run as root, but NOT setuid root
+ *
+ * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
+ * May be distributed under the GNU General Public License
+ *
+ * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002 to be used in busybox
+ */
+
+#define VERSION "2.3.2"
+
+#undef FEATURE_DEBUG_OPT
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <grp.h>
+#include <syslog.h>
+#include <signal.h>
+#include <getopt.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+
+#include "busybox.h"
+
+#define arysize(ary) (sizeof(ary)/sizeof((ary)[0]))
+
+#ifndef CRONTABS
+#define CRONTABS "/var/spool/cron/crontabs"
+#endif
+#ifndef TMPDIR
+#define TMPDIR "/var/spool/cron"
+#endif
+#ifndef LOG_FILE
+#define LOG_FILE "/var/log/cron"
+#endif
+#ifndef SENDMAIL
+#define SENDMAIL "/usr/sbin/sendmail"
+#endif
+#ifndef SENDMAIL_ARGS
+#define SENDMAIL_ARGS "-t", "-oem", "-i"
+#endif
+#ifndef CRONUPDATE
+#define CRONUPDATE "cron.update"
+#endif
+#ifndef MAXLINES
+#define MAXLINES 256 /* max lines in non-root crontabs */
+#endif
+
+
+
+typedef struct CronFile {
+ struct CronFile *cf_Next;
+ struct CronLine *cf_LineBase;
+ char *cf_User; /* username */
+ int cf_Ready; /* bool: one or more jobs ready */
+ int cf_Running; /* bool: one or more jobs running */
+ int cf_Deleted; /* marked for deletion, ignore */
+} CronFile;
+
+typedef struct CronLine {
+ struct CronLine *cl_Next;
+ char *cl_Shell; /* shell command */
+ int cl_Pid; /* running pid, 0, or armed (-1) */
+ int cl_MailFlag; /* running pid is for mail */
+ int cl_MailPos; /* 'empty file' size */
+ char cl_Mins[60]; /* 0-59 */
+ char cl_Hrs[24]; /* 0-23 */
+ char cl_Days[32]; /* 1-31 */
+ char cl_Mons[12]; /* 0-11 */
+ char cl_Dow[7]; /* 0-6, beginning sunday */
+} CronLine;
+
+#define RUN_RANOUT 1
+#define RUN_RUNNING 2
+#define RUN_FAILED 3
+
+#define DaemonUid 0
+
+#ifdef FEATURE_DEBUG_OPT
+static short DebugOpt;
+#endif
+
+static short LogLevel = 8;
+static short ForegroundOpt;
+static short LoggerOpt;
+static const char *LogFile = LOG_FILE;
+static const char *CDir = CRONTABS;
+
+static void log(int level, const char *ctl, ...);
+static void log9(const char *ctl, ...);
+static void startlogger(void);
+
+static void CheckUpdates(void);
+static void SynchronizeDir(void);
+static int TestJobs(time_t t1, time_t t2);
+static void RunJobs(void);
+static int CheckJobs(void);
+static void RunJob(CronFile *file, CronLine *line);
+static void EndJob(const CronFile *file, CronLine *line);
+
+static void DeleteFile(const char *userName);
+
+static CronFile *FileBase;
+
+
+int
+crond_main(int ac, char **av)
+{
+ int i;
+
+ opterr = 0; /* disable getopt 'errors' message.*/
+
+ while ((i = getopt(ac,av,
+#ifdef FEATURE_DEBUG_OPT
+ "d:"
+#endif
+ "l:L:fbSc:")) != EOF){
+
+ switch (i){
+ case 'l':
+ LogLevel = atoi(optarg);
+ break;
+#ifdef FEATURE_DEBUG_OPT
+ case 'd':
+ DebugOpt = atoi(optarg);
+ LogLevel = 0;
+ break;
+#endif
+ case 'f':
+ ForegroundOpt = 1;
+ break;
+ case 'b':
+ ForegroundOpt = 0;
+ break;
+ case 'S': /* select logging to syslog */
+ LoggerOpt = 0;
+ break;
+ case 'L': /* select internal file logger */
+ LoggerOpt = 1;
+ if (*optarg != 0) LogFile = optarg;
+ break;
+ case 'c':
+ if (*optarg != 0) CDir = optarg;
+ break;
+ default: /* parse error */
+ show_usage();
+ }
+ }
+
+ /*
+ * change directory
+ */
+
+ if (chdir(CDir) != 0)
+ perror_msg_and_die("chdir");
+
+ /*
+ * close stdin and stdout, stderr.
+ * close unused descriptors - don't need.
+ * optional detach from controlling terminal
+ */
+
+ if (ForegroundOpt == 0) {
+ if(daemon(1, 0) < 0)
+ perror_msg_and_die("daemon");
+ }
+
+ (void)startlogger(); /* need if syslog mode selected */
+ signal(SIGHUP,SIG_IGN); /* hmm.. but, if kill -HUP original
+ * version - his died. ;(
+ */
+
+ /*
+ * main loop - synchronize to 1 second after the minute, minimum sleep
+ * of 1 second.
+ */
+
+ log(9,"%s " VERSION " dillon, started, log level %d\n", av[0], LogLevel);
+
+ SynchronizeDir();
+
+ {
+ time_t t1 = time(NULL);
+ time_t t2;
+ long dt;
+ short rescan = 60;
+ short sleep_time = 60;
+
+ for (;;) {
+ sleep((sleep_time + 1) - (short)(time(NULL) % sleep_time));
+
+ t2 = time(NULL);
+ dt = t2 - t1;
+
+ /*
+ * The file 'cron.update' is checked to determine new cron
+ * jobs. The directory is rescanned once an hour to deal
+ * with any screwups.
+ *
+ * check for disparity. Disparities over an hour either way
+ * result in resynchronization. A reverse-indexed disparity
+ * less then an hour causes us to effectively sleep until we
+ * match the original time (i.e. no re-execution of jobs that
+ * have just been run). A forward-indexed disparity less then
+ * an hour causes intermediate jobs to be run, but only once
+ * in the worst case.
+ *
+ * when running jobs, the inequality used is greater but not
+ * equal to t1, and less then or equal to t2.
+ */
+
+ if (--rescan == 0) {
+ rescan = 60;
+ SynchronizeDir();
+ }
+ CheckUpdates();
+#ifdef FEATURE_DEBUG_OPT
+ if (DebugOpt)
+ log(5, "Wakeup dt=%d\n", dt);
+#endif
+ if (dt < -60*60 || dt > 60*60) {
+ t1 = t2;
+ log9("time disparity of %d minutes detected\n", dt / 60);
+ } else if (dt > 0) {
+ TestJobs(t1, t2);
+ RunJobs();
+ sleep(5);
+ if (CheckJobs() > 0)
+ sleep_time = 10;
+ else
+ sleep_time = 60;
+ t1 = t2;
+ }
+ }
+ }
+ /* not reached */
+}
+
+
+static void
+vlog(int level, int MLOG_LEVEL, const char *ctl, va_list va)
+{
+ char buf[1024];
+ int logfd;
+
+ if (level >= LogLevel) {
+
+ vsnprintf(buf,sizeof(buf), ctl, va);
+#ifdef FEATURE_DEBUG_OPT
+ if (DebugOpt) fprintf(stderr,"%s",buf);
+ else
+#endif
+ if (LoggerOpt == 0) syslog(MLOG_LEVEL, "%s", buf);
+ else {
+ if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0){
+ write(logfd, buf, strlen(buf));
+ close(logfd);
+ } else
+#ifdef FEATURE_DEBUG_OPT
+ perror_msg("Can't open log file")
+#endif
+ ;
+ }
+ }
+}
+
+/*
+ set log_level=9 and log messages
+*/
+
+static void
+log9(const char *ctl, ...)
+{
+ va_list va;
+
+ va_start(va, ctl);
+ vlog(9, LOG_WARNING, ctl, va);
+ va_end(va);
+}
+
+/*
+ normal logger call point.
+*/
+
+static void
+log(int level, const char *ctl, ...)
+{
+ va_list va;
+
+ va_start(va, ctl);
+ vlog(level, LOG_NOTICE, ctl, va);
+ va_end(va);
+}
+
+/*
+ Original: void
+ logfd(int fd, const char *ctl, ...)
+ Updated to: log_error (used by jobs.c)
+*/
+
+static void
+log_err(const char *ctl, ...)
+{
+ va_list va;
+
+ va_start(va, ctl);
+ vlog(20, LOG_ERR, ctl, va);
+ va_end(va);
+}
+
+/*
+ used by jobs.c (write to temp file..)
+*/
+
+static void
+fdprintf(int fd, const char *ctl, ...)
+{
+ va_list va;
+
+ va_start(va, ctl);
+ vdprintf(fd, ctl, va);
+ va_end(va);
+}
+
+
+static int
+ChangeUser(const char *user, short dochdir)
+{
+ struct passwd *pas;
+
+ /*
+ * Obtain password entry and change privilages
+ */
+
+ if ((pas = getpwnam(user)) == 0) {
+ log(9, "failed to get uid for %s", user);
+ return(-1);
+ }
+ setenv("USER", pas->pw_name, 1);
+ setenv("HOME", pas->pw_dir, 1);
+ setenv("SHELL", "/bin/sh", 1);
+
+ /*
+ * Change running state to the user in question
+ */
+
+ if (initgroups(user, pas->pw_gid) < 0) {
+ log(9, "initgroups failed: %s %m", user);
+ return(-1);
+ }
+ if (setregid(pas->pw_gid, pas->pw_gid) < 0) {
+ log(9, "setregid failed: %s %d", user, pas->pw_gid);
+ return(-1);
+ }
+ if (setreuid(pas->pw_uid, pas->pw_uid) < 0) {
+ log(9, "setreuid failed: %s %d", user, pas->pw_uid);
+ return(-1);
+ }
+ if (dochdir) {
+ if (chdir(pas->pw_dir) < 0) {
+ log(8, "chdir failed: %s %s", user, pas->pw_dir);
+ if (chdir(TMPDIR) < 0) {
+ log(9, "chdir failed: %s %s", TMPDIR, user);
+ return(-1);
+ }
+ }
+ }
+ return(pas->pw_uid);
+}
+
+static void
+startlogger(void)
+{
+ int logfd;
+
+ if (LoggerOpt == 0)
+ openlog(applet_name, LOG_CONS|LOG_PID,LOG_CRON);
+
+ else { /* test logfile */
+ if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0)
+ close(logfd);
+ else
+#ifdef FEATURE_DEBUG_OPT
+ printf("Failed to open log file '%s' reason: %m", LogFile)
+#endif
+ ;
+ }
+}
+
+
+static const char * const DowAry[] = {
+ "sun",
+ "mon",
+ "tue",
+ "wed",
+ "thu",
+ "fri",
+ "sat",
+
+ "Sun",
+ "Mon",
+ "Tue",
+ "Wed",
+ "Thu",
+ "Fri",
+ "Sat",
+ NULL
+};
+
+static const char * const MonAry[] = {
+ "jan",
+ "feb",
+ "mar",
+ "apr",
+ "may",
+ "jun",
+ "jul",
+ "aug",
+ "sep",
+ "oct",
+ "nov",
+ "dec",
+
+ "Jan",
+ "Feb",
+ "Mar",
+ "Apr",
+ "May",
+ "Jun",
+ "Jul",
+ "Aug",
+ "Sep",
+ "Oct",
+ "Nov",
+ "Dec",
+ NULL
+};
+
+static char *
+ParseField(char *user, char *ary, int modvalue, int off,
+ const char * const *names, char *ptr)
+{
+ char *base = ptr;
+ int n1 = -1;
+ int n2 = -1;
+
+ if (base == NULL)
+ return(NULL);
+
+ while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+ int skip = 0;
+
+ /*
+ * Handle numeric digit or symbol or '*'
+ */
+
+ if (*ptr == '*') {
+ n1 = 0; /* everything will be filled */
+ n2 = modvalue - 1;
+ skip = 1;
+ ++ptr;
+ } else if (*ptr >= '0' && *ptr <= '9') {
+ if (n1 < 0)
+ n1 = strtol(ptr, &ptr, 10) + off;
+ else
+ n2 = strtol(ptr, &ptr, 10) + off;
+ skip = 1;
+ } else if (names) {
+ int i;
+
+ for (i = 0; names[i]; ++i) {
+ if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
+ break;
+ }
+ }
+ if (names[i]) {
+ ptr += strlen(names[i]);
+ if (n1 < 0)
+ n1 = i;
+ else
+ n2 = i;
+ skip = 1;
+ }
+ }
+
+ /*
+ * handle optional range '-'
+ */
+
+ if (skip == 0) {
+ log9("failed user %s parsing %s\n", user, base);
+ return(NULL);
+ }
+ if (*ptr == '-' && n2 < 0) {
+ ++ptr;
+ continue;
+ }
+
+ /*
+ * collapse single-value ranges, handle skipmark, and fill
+ * in the character array appropriately.
+ */
+
+ if (n2 < 0)
+ n2 = n1;
+
+ if (*ptr == '/')
+ skip = strtol(ptr + 1, &ptr, 10);
+
+ /*
+ * fill array, using a failsafe is the easiest way to prevent
+ * an endless loop
+ */
+
+ {
+ int s0 = 1;
+ int failsafe = 1024;
+
+ --n1;
+ do {
+ n1 = (n1 + 1) % modvalue;
+
+ if (--s0 == 0) {
+ ary[n1 % modvalue] = 1;
+ s0 = skip;
+ }
+ } while (n1 != n2 && --failsafe);
+
+ if (failsafe == 0) {
+ log9("failed user %s parsing %s\n", user, base);
+ return(NULL);
+ }
+ }
+ if (*ptr != ',')
+ break;
+ ++ptr;
+ n1 = -1;
+ n2 = -1;
+ }
+
+ if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+ log9("failed user %s parsing %s\n", user, base);
+ return(NULL);
+ }
+
+ while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')
+ ++ptr;
+
+#ifdef FEATURE_DEBUG_OPT
+ if (DebugOpt) {
+ int i;
+
+ for (i = 0; i < modvalue; ++i)
+ log(5, "%d", ary[i]);
+ log(5, "\n");
+ }
+#endif
+
+ return(ptr);
+}
+
+static void
+FixDayDow(CronLine *line)
+{
+ short i;
+ short weekUsed = 0;
+ short daysUsed = 0;
+
+ for (i = 0; i < arysize(line->cl_Dow); ++i) {
+ if (line->cl_Dow[i] == 0) {
+ weekUsed = 1;
+ break;
+ }
+ }
+ for (i = 0; i < arysize(line->cl_Days); ++i) {
+ if (line->cl_Days[i] == 0) {
+ daysUsed = 1;
+ break;
+ }
+ }
+ if (weekUsed && !daysUsed) {
+ memset(line->cl_Days, 0, sizeof(line->cl_Days));
+ }
+ 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 18:21:05 +0000