| /* vi: set sw=4 ts=4: */ |
| /* |
| * crond -d[#] -c <crondir> -f -b |
| * |
| * run as root, but NOT setuid root |
| * |
| * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com) |
| * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002 |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| #define VERSION "2.3.2" |
| |
| #include "libbb.h" |
| #include <sys/syslog.h> |
| |
| |
| #ifndef CRONTABS |
| #define CRONTABS "/var/spool/cron/crontabs" |
| #endif |
| #ifndef TMPDIR |
| #define TMPDIR "/var/spool/cron" |
| #endif |
| #ifndef SENDMAIL |
| #define SENDMAIL "/usr/sbin/sendmail" |
| #endif |
| #ifndef SENDMAIL_ARGS |
| #define SENDMAIL_ARGS "-ti", "oem" |
| #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 */ |
| pid_t 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 |
| |
| #if ENABLE_DEBUG_CROND_OPTION |
| static unsigned DebugOpt; |
| #endif |
| |
| static unsigned LogLevel = 8; |
| static const char *LogFile; |
| static const char *CDir = CRONTABS; |
| |
| 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(const char *user, CronLine * line); |
| |
| #if ENABLE_FEATURE_CROND_CALL_SENDMAIL |
| static void EndJob(const char *user, CronLine * line); |
| #else |
| #define EndJob(user, line) line->cl_Pid = 0 |
| #endif |
| |
| static void DeleteFile(const char *userName); |
| |
| static CronFile *FileBase; |
| |
| |
| static void crondlog(const char *ctl, ...) |
| { |
| va_list va; |
| const char *fmt; |
| int level = (int) (ctl[0] & 0xf); |
| int type = level == 20 ? |
| LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE); |
| |
| |
| va_start(va, ctl); |
| fmt = ctl + 1; |
| if (level >= LogLevel) { |
| |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| vfprintf(stderr, fmt, va); |
| } else |
| #endif |
| if (LogFile == 0) { |
| vsyslog(type, fmt, va); |
| } else { |
| #if !ENABLE_DEBUG_CROND_OPTION |
| int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600); |
| #else |
| int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600); |
| #endif |
| if (logfd >= 0) { |
| vdprintf(logfd, fmt, va); |
| close(logfd); |
| } |
| } |
| } |
| va_end(va); |
| if (ctl[0] & 0200) { |
| exit(20); |
| } |
| } |
| |
| int crond_main(int ac, char **av); |
| int crond_main(int ac, char **av) |
| { |
| unsigned opt; |
| char *lopt, *Lopt, *copt; |
| USE_DEBUG_CROND_OPTION(char *dopt;) |
| |
| opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l"); |
| opterr = 0; /* disable getopt 'errors' message. */ |
| opt = getopt32(ac, av, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"), |
| &lopt, &Lopt, &copt USE_DEBUG_CROND_OPTION(, &dopt)); |
| if (opt & 1) /* -l */ |
| LogLevel = xatou(lopt); |
| if (opt & 2) /* -L */ |
| if (*Lopt) |
| LogFile = Lopt; |
| if (opt & 32) /* -c */ |
| if (*copt) |
| CDir = copt; |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (opt & 64) { /* -d */ |
| DebugOpt = xatou(dopt); |
| LogLevel = 0; |
| } |
| #endif |
| |
| /* close stdin and stdout, stderr. |
| * close unused descriptors - don't need. |
| * optional detach from controlling terminal |
| */ |
| if (!(opt & 4)) |
| bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, av); |
| |
| xchdir(CDir); |
| signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */ |
| |
| startlogger(); /* need if syslog mode selected */ |
| |
| /* |
| * main loop - synchronize to 1 second after the minute, minimum sleep |
| * of 1 second. |
| */ |
| crondlog("\011%s " VERSION " dillon, started, log level %d\n", |
| applet_name, LogLevel); |
| |
| SynchronizeDir(); |
| |
| { |
| time_t t1 = time(NULL); |
| time_t t2; |
| long dt; |
| int rescan = 60; |
| short sleep_time = 60; |
| |
| write_pidfile("/var/run/crond.pid"); |
| 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(); |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) |
| crondlog("\005Wakeup dt=%d\n", dt); |
| #endif |
| if (dt < -60 * 60 || dt > 60 * 60) { |
| t1 = t2; |
| crondlog("\111time 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; |
| } |
| } |
| } |
| return 0; /* not reached */ |
| } |
| |
| static int ChangeUser(const char *user) |
| { |
| struct passwd *pas; |
| const char *err_msg; |
| |
| /* |
| * Obtain password entry and change privileges |
| */ |
| pas = getpwnam(user); |
| if (pas == 0) { |
| crondlog("\011failed to get uid for %s", user); |
| return -1; |
| } |
| setenv("USER", pas->pw_name, 1); |
| setenv("HOME", pas->pw_dir, 1); |
| setenv("SHELL", DEFAULT_SHELL, 1); |
| |
| /* |
| * Change running state to the user in question |
| */ |
| err_msg = change_identity_e2str(pas); |
| if (err_msg) { |
| crondlog("\011%s for user %s", err_msg, user); |
| return -1; |
| } |
| if (chdir(pas->pw_dir) < 0) { |
| crondlog("\011chdir failed: %s: %m", pas->pw_dir); |
| if (chdir(TMPDIR) < 0) { |
| crondlog("\011chdir failed: %s: %m", TMPDIR); |
| return -1; |
| } |
| } |
| return pas->pw_uid; |
| } |
| |
| static void startlogger(void) |
| { |
| if (LogFile == 0) { |
| openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON); |
| } |
| #if ENABLE_DEBUG_CROND_OPTION |
| else { /* test logfile */ |
| int logfd; |
| |
| logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600); |
| if (logfd >= 0) { |
| close(logfd); |
| } |
| } |
| #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) { |
| crondlog("\111failed 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) { |
| crondlog("\111failed user %s parsing %s\n", user, base); |
| return NULL; |
| } |
| } |
| if (*ptr != ',') { |
| break; |
| } |
| ++ptr; |
| n1 = -1; |
| n2 = -1; |
| } |
| |
| if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') { |
| crondlog("\111failed user %s parsing %s\n", user, base); |
| return NULL; |
| } |
| |
| while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') { |
| ++ptr; |
| } |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| int i; |
| |
| for (i = 0; i < modvalue; ++i) { |
| crondlog("\005%d", ary[i]); |
| } |
| crondlog("\005\n"); |
| } |
| #endif |
| |
| return ptr; |
| } |
| |
| static void FixDayDow(CronLine * line) |
| { |
| int i; |
| int weekUsed = 0; |
| int daysUsed = 0; |
| |
| for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Dow)); ++i) { |
| if (line->cl_Dow[i] == 0) { |
| weekUsed = 1; |
| break; |
| } |
| } |
| for (i = 0; i < (int)(ARRAY_SIZE(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); |
| |
| fi = fopen(fileName, "r"); |
| if (fi != NULL) { |
| struct stat sbuf; |
| |
| if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { |
| CronFile *file = xzalloc(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; |
| |
| trim(buf); |
| if (buf[0] == 0 || buf[0] == '#') { |
| continue; |
| } |
| if (--maxEntries == 0) { |
| break; |
| } |
| memset(&line, 0, sizeof(line)); |
| |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| crondlog("\111User %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 = xzalloc(sizeof(CronLine)); |
| **pline = line; |
| |
| /* copy command */ |
| (*pline)->cl_Shell = strdup(ptr); |
| |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| crondlog("\111 Command %s\n", ptr); |
| } |
| #endif |
| |
| pline = &((*pline)->cl_Next); |
| } |
| *pline = NULL; |
| |
| file->cf_Next = FileBase; |
| FileBase = file; |
| |
| if (maxLines == 0 || maxEntries == 0) { |
| crondlog("\111Maximum number of lines reached for user %s\n", fileName); |
| } |
| } |
| fclose(fi); |
| } |
| } |
| } |
| |
| static void CheckUpdates(void) |
| { |
| FILE *fi; |
| char buf[256]; |
| |
| fi = fopen(CRONUPDATE, "r"); |
| if (fi != 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. */ |
| |
| for (;;) { |
| CronFile *file; |
| |
| for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next); |
| if (file == NULL) { |
| break; |
| } |
| DeleteFile(file->cf_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) { |
| crondlog("\311cannot find %s\n", CDir); |
| } |
| { |
| DIR *dir = opendir("."); |
| struct dirent *den; |
| |
| if (dir) { |
| while ((den = readdir(dir))) { |
| if (strchr(den->d_name, '.') != NULL) { |
| continue; |
| } |
| if (getpwnam(den->d_name)) { |
| SynchronizeFile(den->d_name); |
| } else { |
| crondlog("\007ignoring %s\n", den->d_name); |
| } |
| } |
| closedir(dir); |
| } else { |
| crondlog("\311cannot open current dir!\n"); |
| } |
| } |
| } |
| |
| |
| /* |
| * 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) |
| { |
| int 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) { |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) |
| crondlog("\005FILE %s:\n", file->cf_User); |
| #endif |
| if (file->cf_Deleted) |
| continue; |
| for (line = file->cf_LineBase; line; line = line->cl_Next) { |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) |
| crondlog("\005 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]) { |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| crondlog("\005 JobToDo: %d %s\n", |
| line->cl_Pid, line->cl_Shell); |
| } |
| #endif |
| if (line->cl_Pid > 0) { |
| crondlog("\010 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->cf_User, line); |
| |
| crondlog("\010USER %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->cf_User, line); |
| if (line->cl_Pid) { |
| file->cf_Running = 1; |
| } |
| } else if (r == 0) { |
| file->cf_Running = 1; |
| } |
| } |
| } |
| } |
| nStillRunning += file->cf_Running; |
| } |
| return nStillRunning; |
| } |
| |
| |
| #if ENABLE_FEATURE_CROND_CALL_SENDMAIL |
| static void |
| ForkJob(const char *user, CronLine * line, int mailFd, |
| const char *prog, const char *cmd, const char *arg, const char *mailf) |
| { |
| /* Fork as the user in question and run program */ |
| pid_t pid = fork(); |
| |
| line->cl_Pid = pid; |
| if (pid == 0) { |
| /* CHILD */ |
| |
| /* Change running state to the user in question */ |
| |
| if (ChangeUser(user) < 0) { |
| exit(0); |
| } |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| crondlog("\005Child Running %s\n", prog); |
| } |
| #endif |
| |
| if (mailFd >= 0) { |
| dup2(mailFd, mailf != NULL); |
| dup2((mailf ? mailFd : 1), 2); |
| close(mailFd); |
| } |
| execl(prog, prog, cmd, arg, NULL); |
| crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg); |
| if (mailf) { |
| fdprintf(1, "Exec failed: %s -c %s\n", prog, arg); |
| } |
| exit(0); |
| } else if (pid < 0) { |
| /* FORK FAILED */ |
| crondlog("\024cannot fork, user %s\n", user); |
| line->cl_Pid = 0; |
| if (mailf) { |
| remove(mailf); |
| } |
| } else if (mailf) { |
| /* PARENT, FORK SUCCESS |
| * rename mail-file based on pid of process |
| */ |
| char mailFile2[128]; |
| |
| snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid); |
| rename(mailf, 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); |
| } |
| } |
| |
| static void RunJob(const char *user, 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", 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", user, |
| line->cl_Shell); |
| line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR); |
| } else { |
| crondlog("\024cannot create mail file user %s file %s, output to /dev/null\n", user, mailFile); |
| } |
| |
| ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile); |
| } |
| |
| /* |
| * EndJob - called when job terminates and when mail terminates |
| */ |
| |
| static void EndJob(const char *user, 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", 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; |
| } |
| ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL); |
| } |
| #else |
| /* crond without sendmail */ |
| |
| static void RunJob(const char *user, CronLine * line) |
| { |
| /* Fork as the user in question and run program */ |
| pid_t pid = fork(); |
| |
| if (pid == 0) { |
| /* CHILD */ |
| |
| /* Change running state to the user in question */ |
| |
| if (ChangeUser(user) < 0) { |
| exit(0); |
| } |
| #if ENABLE_DEBUG_CROND_OPTION |
| if (DebugOpt) { |
| crondlog("\005Child Running %s\n", DEFAULT_SHELL); |
| } |
| #endif |
| |
| execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL); |
| crondlog("\024cannot exec, user %s cmd %s -c %s\n", user, |
| DEFAULT_SHELL, line->cl_Shell); |
| exit(0); |
| } else if (pid < 0) { |
| /* FORK FAILED */ |
| crondlog("\024cannot, user %s\n", user); |
| pid = 0; |
| } |
| line->cl_Pid = pid; |
| } |
| #endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */ |