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-rw-r--r--miscutils/Config.in7
-rw-r--r--miscutils/crond.c411
2 files changed, 193 insertions, 225 deletions
diff --git a/miscutils/Config.in b/miscutils/Config.in
index b4a3475de..0c56f0ee9 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -19,6 +19,13 @@ config CONFIG_CROND
Crond is a background daemon that parses individual crontab
files and executes commands on behalf of the users in question.
+config CONFIG_FEATURE_CROND_CALL_SENDMAIL
+ bool " Using /usr/sbin/sendmail?"
+ default n
+ depends on CONFIG_CROND
+ help
+ Support call /usr/sbin/sendmail for send cmd outputs.
+
config CONFIG_CRONTAB
bool "crontab"
default n
diff --git a/miscutils/crond.c b/miscutils/crond.c
index 9d9ecc290..198bc2d85 100644
--- a/miscutils/crond.c
+++ b/miscutils/crond.c
@@ -41,14 +41,11 @@
#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"
+#define SENDMAIL_ARGS "-ti", "oem"
#endif
#ifndef CRONUPDATE
#define CRONUPDATE "cron.update"
@@ -57,6 +54,7 @@
#define MAXLINES 256 /* max lines in non-root crontabs */
#endif
+static const char def_sh[] = "/bin/sh";
typedef struct CronFile {
@@ -71,7 +69,7 @@ typedef struct CronFile {
typedef struct CronLine {
struct CronLine *cl_Next;
char *cl_Shell; /* shell command */
- int cl_Pid; /* running pid, 0, or armed (-1) */
+ 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 */
@@ -92,13 +90,9 @@ static short DebugOpt;
#endif
static short LogLevel = 8;
-static short ForegroundOpt;
-static short LoggerOpt;
-static const char *LogFile = LOG_FILE;
+static const char *LogFile;
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);
@@ -106,14 +100,54 @@ 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 RunJob(const char *user, CronLine *line);
+#ifdef CONFIG_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
+log(const char *ctl, ...)
+{
+ va_list va;
+ int level = (int)(ctl[0] & 0xf);
+ int type = level == 20 ?
+ LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);
+
+
+ va_start(va, ctl);
+ if (level >= LogLevel) {
+
+#ifdef FEATURE_DEBUG_OPT
+ if (DebugOpt) vfprintf(stderr, ctl, va);
+ else
+#endif
+ if (LogFile == 0) vsyslog(type, ctl, va);
+ else {
+ int logfd;
+
+ if ((logfd = open(LogFile, O_WRONLY|O_CREAT|O_APPEND, 600)) >= 0) {
+ vdprintf(logfd, ctl, va);
+ close(logfd);
+#ifdef FEATURE_DEBUG_OPT
+ } else {
+ bb_perror_msg("Can't open log file");
+#endif
+ }
+ }
+ }
+ va_end(va);
+ if(ctl[0] & 0200)
+ exit(20);
+}
+
int
crond_main(int ac, char **av)
{
@@ -138,10 +172,8 @@ crond_main(int ac, char **av)
);
if(opt & 1)
LogLevel = atoi(lopt);
- LoggerOpt = opt & 2;
- if(LoggerOpt)
+ if(opt & 2)
if (*Lopt != 0) LogFile = Lopt;
- ForegroundOpt = opt & 4;
if(opt & 32) {
if (*copt != 0) CDir = copt;
}
@@ -157,7 +189,7 @@ crond_main(int ac, char **av)
*/
if (chdir(CDir) != 0)
- bb_perror_msg_and_die("chdir");
+ bb_perror_msg_and_die("%s", CDir);
signal(SIGHUP,SIG_IGN); /* hmm.. but, if kill -HUP original
* version - his died. ;(
@@ -168,9 +200,15 @@ crond_main(int ac, char **av)
* optional detach from controlling terminal
*/
- if (ForegroundOpt == 0) {
- if(daemon(1, 0) < 0)
+ if (!(opt & 4)) {
+ if(daemon(1, 0) < 0) {
bb_perror_msg_and_die("daemon");
+#if defined(__uClinux__)
+ } else {
+ /* reexec for vfork() do continue parent */
+ vfork_daemon_rexec(ac, av, "-f");
+ }
+#endif /* uClinux */
}
(void)startlogger(); /* need if syslog mode selected */
@@ -180,7 +218,8 @@ crond_main(int ac, char **av)
* of 1 second.
*/
- log(9,"%s " VERSION " dillon, started, log level %d\n", av[0], LogLevel);
+ log("\011%s " VERSION " dillon, started, log level %d\n", bb_applet_name,
+ LogLevel);
SynchronizeDir();
@@ -221,11 +260,11 @@ crond_main(int ac, char **av)
CheckUpdates();
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt)
- log(5, "Wakeup dt=%d\n", dt);
+ log("\005Wakeup dt=%d\n", dt);
#endif
if (dt < -60*60 || dt > 60*60) {
t1 = t2;
- log9("time disparity of %d minutes detected\n", dt / 60);
+ log("\111time disparity of %d minutes detected\n", dt / 60);
} else if (dt > 0) {
TestJobs(t1, t2);
RunJobs();
@@ -242,81 +281,10 @@ crond_main(int ac, char **av)
}
-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
- bb_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);
-}
-
+#if defined(FEATURE_DEBUG_OPT) || defined(CONFIG_FEATURE_CROND_CALL_SENDMAIL)
/*
- Original: void
- logfd(int fd, const char *ctl, ...)
- Updated to: log_error (used by jobs.c)
+ write to temp file..
*/
-
-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, ...)
{
@@ -326,10 +294,11 @@ fdprintf(int fd, const char *ctl, ...)
vdprintf(fd, ctl, va);
va_end(va);
}
+#endif
static int
-ChangeUser(const char *user, short dochdir)
+ChangeUser(const char *user)
{
struct passwd *pas;
@@ -338,58 +307,55 @@ ChangeUser(const char *user, short dochdir)
*/
if ((pas = getpwnam(user)) == 0) {
- log(9, "failed to get uid for %s", user);
+ log("\011failed 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);
+ setenv("SHELL", def_sh, 1);
/*
* Change running state to the user in question
*/
if (initgroups(user, pas->pw_gid) < 0) {
- log(9, "initgroups failed: %s %m", user);
+ log("\011initgroups 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);
+ /* drop all priviledges */
+ if (setgid(pas->pw_gid) < 0) {
+ log("\011setgid 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);
+ if (setuid(pas->pw_uid) < 0) {
+ log("\011setuid 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);
+ log("\011chdir failed: %s: %m", pas->pw_dir);
if (chdir(TMPDIR) < 0) {
- log(9, "chdir failed: %s %s", TMPDIR, user);
+ log("\011chdir failed: %s: %m", TMPDIR);
return(-1);
}
}
- }
return(pas->pw_uid);
}
static void
startlogger(void)
{
+ if (LogFile == 0)
+ openlog(bb_applet_name, LOG_CONS|LOG_PID, LOG_CRON);
+#ifdef FEATURE_DEBUG_OPT
+ else { /* test logfile */
int logfd;
- if (LoggerOpt == 0)
- openlog(bb_applet_name, LOG_CONS|LOG_PID,LOG_CRON);
-
- else { /* test logfile */
- if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0)
+ 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
- ;
+ bb_perror_msg("Failed to open log file '%s' reason", LogFile);
}
+#endif
}
@@ -493,7 +459,7 @@ ParseField(char *user, char *ary, int modvalue, int off,
*/
if (skip == 0) {
- log9("failed user %s parsing %s\n", user, base);
+ log("\111failed user %s parsing %s\n", user, base);
return(NULL);
}
if (*ptr == '-' && n2 < 0) {
@@ -532,7 +498,7 @@ ParseField(char *user, char *ary, int modvalue, int off,
} while (n1 != n2 && --failsafe);
if (failsafe == 0) {
- log9("failed user %s parsing %s\n", user, base);
+ log("\111failed user %s parsing %s\n", user, base);
return(NULL);
}
}
@@ -544,7 +510,7 @@ ParseField(char *user, char *ary, int modvalue, int off,
}
if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
- log9("failed user %s parsing %s\n", user, base);
+ log("\111failed user %s parsing %s\n", user, base);
return(NULL);
}
@@ -556,8 +522,8 @@ ParseField(char *user, char *ary, int modvalue, int off,
int i;
for (i = 0; i < modvalue; ++i)
- log(5, "%d", ary[i]);
- log(5, "\n");
+ log("\005%d", ary[i]);
+ log("\005\n");
}
#endif
@@ -636,7 +602,7 @@ SynchronizeFile(const char *fileName)
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt)
- log9("User %s Entry %s\n", fileName, buf);
+ log("\111User %s Entry %s\n", fileName, buf);
#endif
/*
@@ -674,7 +640,7 @@ SynchronizeFile(const char *fileName)
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt) {
- log9(" Command %s\n", ptr);
+ log("\111 Command %s\n", ptr);
}
#endif
@@ -686,7 +652,7 @@ SynchronizeFile(const char *fileName)
FileBase = file;
if (maxLines == 0 || maxEntries == 0)
- log9("Maximum number of lines reached for user %s\n", fileName);
+ log("\111Maximum number of lines reached for user %s\n", fileName);
}
fclose(fi);
}
@@ -712,21 +678,17 @@ static void
SynchronizeDir(void)
{
/*
- * Attempt to delete the database. Note that we have to make a copy
- * of the string
+ * Attempt to delete the database.
*/
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);
+ DeleteFile(file->cf_User);
}
/*
@@ -740,8 +702,7 @@ SynchronizeDir(void)
remove(CRONUPDATE);
if (chdir(CDir) < 0) {
- log9("unable to find %s\n", CDir);
- exit(20);
+ log("\311unable to find %s\n", CDir);
}
{
DIR *dir;
@@ -754,12 +715,11 @@ SynchronizeDir(void)
if (getpwnam(den->d_name))
SynchronizeFile(den->d_name);
else
- log(7, "ignoring %s\n", den->d_name);
+ log("\007ignoring %s\n", den->d_name);
}
closedir(dir);
} else {
- log9("Unable to open current dir!\n");
- exit(20);
+ log("\311Unable to open current dir!\n");
}
}
}
@@ -836,14 +796,14 @@ TestJobs(time_t t1, time_t t2)
for (file = FileBase; file; file = file->cf_Next) {
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt)
- log(5, "FILE %s:\n", file->cf_User);
+ log("\005FILE %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);
+ log("\005 LINE %s\n", line->cl_Shell);
#endif
if (line->cl_Mins[tp->tm_min] &&
line->cl_Hrs[tp->tm_hour] &&
@@ -852,10 +812,10 @@ TestJobs(time_t t1, time_t t2)
) {
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt)
- log(5, " JobToDo: %d %s\n", line->cl_Pid, line->cl_Shell);
+ log("\005 JobToDo: %d %s\n", line->cl_Pid, line->cl_Shell);
#endif
if (line->cl_Pid > 0) {
- log(8, " process already running: %s %s\n",
+ log("\010 process already running: %s %s\n",
file->cf_User,
line->cl_Shell
);
@@ -885,9 +845,9 @@ RunJobs(void)
for (line = file->cf_LineBase; line; line = line->cl_Next) {
if (line->cl_Pid < 0) {
- RunJob(file, line);
+ RunJob(file->cf_User, line);
- log(8, "USER %s pid %3d cmd %s\n",
+ log("\010USER %s pid %3d cmd %s\n",
file->cf_User,
line->cl_Pid,
line->cl_Shell
@@ -926,7 +886,7 @@ CheckJobs(void)
int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);
if (r < 0 || r == line->cl_Pid) {
- EndJob(file, line);
+ EndJob(file->cf_User, line);
if (line->cl_Pid)
file->cf_Running = 1;
} else if (r == 0) {
@@ -941,83 +901,54 @@ CheckJobs(void)
}
-
+#ifdef CONFIG_FEATURE_CROND_CALL_SENDMAIL
static void
-RunJob(CronFile *file, CronLine *line)
+ForkJob(const char *user, CronLine *line, int mailFd,
+ const char *prog, const char *cmd, const char *arg, const char *mailf)
{
- 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
*/
+ pid_t pid = fork();
- if ((line->cl_Pid = fork()) == 0) {
+ line->cl_Pid = pid;
+ if (pid == 0) {
/*
- * CHILD, FORK OK
+ * CHILD
*/
/*
* Change running state to the user in question
*/
- if (ChangeUser(file->cf_User, 1) < 0)
- return;
+ if (ChangeUser(user) < 0)
+ exit(0);
#ifdef FEATURE_DEBUG_OPT
if (DebugOpt)
- log(5, "Child Running %s\n", line->cl_Shell);
+ log("\005Child Running %s\n", prog);
#endif
- /*
- * stdin is already /dev/null, setup stdout and stderr
- */
-
if (mailFd >= 0) {
- dup2(mailFd, 1);
- dup2(mailFd, 2);
+ dup2(mailFd, mailf != NULL);
+ dup2((mailf ? mailFd : 1), 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);
+ execl(prog, prog, cmd, arg, NULL);
+ log("\024unable to 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 (line->cl_Pid < 0) {
+ } else if (pid < 0) {
/*
- * PARENT, FORK FAILED
+ * FORK FAILED
*/
- log_err("couldn't fork, user %s\n", file->cf_User);
+ log("\024couldn't fork, user %s\n", user);
line->cl_Pid = 0;
- remove(mailFile);
- } else {
+ if(mailf)
+ remove(mailf);
+ } else if(mailf) {
/*
* PARENT, FORK SUCCESS
*
@@ -1026,10 +957,9 @@ RunJob(CronFile *file, CronLine *line)
char mailFile2[128];
snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d",
- file->cf_User, line->cl_Pid);
- rename(mailFile, mailFile2);
+ 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
@@ -1039,12 +969,42 @@ RunJob(CronFile *file, CronLine *line)
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, 1);
+ } else {
+ log("\024unable to create mail file user %s file %s, output to /dev/null\n",
+ user, mailFile);
+ }
+
+ ForkJob(user, line, mailFd, def_sh, "-c", line->cl_Shell, mailFile);
+}
+
/*
* EndJob - called when job terminates and when mail terminates
*/
static void
-EndJob(const CronFile *file, CronLine *line)
+EndJob(const char *user, CronLine *line)
{
int mailFd;
char mailFile[128];
@@ -1065,7 +1025,7 @@ EndJob(const CronFile *file, CronLine *line)
*/
snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d",
- file->cf_User, line->cl_Pid);
+ user, line->cl_Pid);
line->cl_Pid = 0;
if (line->cl_MailFlag != 1)
@@ -1093,46 +1053,47 @@ EndJob(const CronFile *file, CronLine *line)
close(mailFd);
return;
}
+ ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
+}
+#else
+/* crond whithout sendmail */
- if ((line->cl_Pid = fork()) == 0) {
+static void
+RunJob(const char *user, CronLine *line)
+{
/*
- * CHILD, FORK OK
+ * Fork as the user in question and run program
*/
+ pid_t pid = fork();
+ if (pid == 0) {
/*
- * change user id - no way in hell security can be compromised
- * by the mailing and we already verified the mail file.
+ * CHILD
*/
- if (ChangeUser(file->cf_User, 1) < 0)
- exit(0);
-
/*
- * run sendmail with mail file as standard input, only if
- * mail file exists!
+ * Change running state to the user in question
*/
- dup2(mailFd, 0);
- dup2(1, 2);
- close(mailFd);
+ if (ChangeUser(user) < 0)
+ exit(0);
+
+#ifdef FEATURE_DEBUG_OPT
+ if (DebugOpt)
+ log("\005Child Running %s\n", def_sh);
+#endif
- 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
- );
+ execl(def_sh, def_sh, "-c", line->cl_Shell, NULL);
+ log("\024unable to exec, user %s cmd %s -c %s\n", user,
+ def_sh, line->cl_Shell);
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 {
+ } else if (pid < 0) {
/*
- * PARENT, FORK OK
+ * FORK FAILED
*/
+ log("\024couldn't fork, user %s\n", user);
+ pid = 0;
}
- close(mailFd);
+ line->cl_Pid = pid;
}
+#endif /* CONFIG_FEATURE_CROND_CALL_SENDMAIL */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 19:37:54 +0000