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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-12 22:10:25 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-03-12 22:10:25 +0000
commit4e6c8120a53709c4a352db42e997303844c74584 (patch)
tree67494852dbb86ff0c25f161181bca156cd9a612e /miscutils/crond.c
parent35e9c5d83ada1fea40798365a1b4c728f64ded98 (diff)
downloadbusybox-4e6c8120a53709c4a352db42e997303844c74584.tar.gz
busybox-4e6c8120a53709c4a352db42e997303844c74584.tar.bz2
crond: make it NOMMU-capable
function old new delta safe_setenv4 - 62 +62 ForkJob 472 511 +39 change_identity 21 57 +36 ParseField 564 571 +7 SynchronizeDir 178 176 -2 LogLevel 4 - -4 LogFile 4 - -4 FileBase 4 - -4 DebugOpt 4 - -4 CDir 4 - -4 DeleteFile 141 132 -9 packed_usage 24248 24228 -20 crondlog 157 113 -44 change_identity_e2str 54 - -54 SynchronizeFile 729 671 -58 crond_main 1555 1404 -151 ------------------------------------------------------------------------------ (add/remove: 1/6 grow/shrink: 3/6 up/down: 144/-358) Total: -214 bytes
Diffstat (limited to 'miscutils/crond.c')
-rw-r--r--miscutils/crond.c745
1 files changed, 360 insertions, 385 deletions
diff --git a/miscutils/crond.c b/miscutils/crond.c
index 9721a8a9a..6d4825e85 100644
--- a/miscutils/crond.c
+++ b/miscutils/crond.c
@@ -14,6 +14,15 @@
#include "libbb.h"
#include <syslog.h>
+/* glibc frees previous setenv'ed value when we do next setenv()
+ * of the same variable. uclibc does not do this! */
+#if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
+#define SETENV_LEAKS 0
+#else
+#define SETENV_LEAKS 1
+#endif
+
+
#ifndef CRONTABS
#define CRONTABS "/var/spool/cron/crontabs"
#endif
@@ -33,160 +42,169 @@
#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 */
+ char *cf_User; /* username */
+ smallint cf_Ready; /* bool: one or more jobs ready */
+ smallint cf_Running; /* bool: one or more jobs running */
+ smallint 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 */
+ char *cl_Shell; /* shell command */
+ pid_t cl_Pid; /* running pid, 0, or armed (-1) */
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+ int cl_MailPos; /* 'empty file' size */
+ smallint cl_MailFlag; /* running pid is for mail */
+#endif
+ /* ordered by size, not in natural order. makes code smaller: */
+ char cl_Dow[7]; /* 0-6, beginning sunday */
+ char cl_Mons[12]; /* 0-11 */
+ char cl_Hrs[24]; /* 0-23 */
+ char cl_Days[32]; /* 1-31 */
+ char cl_Mins[60]; /* 0-59 */
} CronLine;
-#define RUN_RANOUT 1
-#define RUN_RUNNING 2
-#define RUN_FAILED 3
#define DaemonUid 0
+
+enum {
+ OPT_l = (1 << 0),
+ OPT_L = (1 << 1),
+ OPT_f = (1 << 2),
+ OPT_b = (1 << 3),
+ OPT_S = (1 << 4),
+ OPT_c = (1 << 5),
+ OPT_d = (1 << 6) * ENABLE_DEBUG_CROND_OPTION,
+};
#if ENABLE_DEBUG_CROND_OPTION
-static unsigned DebugOpt;
+#define DebugOpt (option_mask32 & OPT_d)
+#else
+#define DebugOpt 0
#endif
-static unsigned LogLevel = 8;
-static const char *LogFile;
-static const char *CDir = CRONTABS;
-static void startlogger(void);
+struct globals {
+ unsigned LogLevel; /* = 8; */
+ const char *LogFile;
+ const char *CDir; /* = CRONTABS; */
+ CronFile *FileBase;
+#if SETENV_LEAKS
+ char *env_var_user;
+ char *env_var_home;
+#endif
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define LogLevel (G.LogLevel )
+#define LogFile (G.LogFile )
+#define CDir (G.CDir )
+#define FileBase (G.FileBase )
+#define env_var_user (G.env_var_user )
+#define env_var_home (G.env_var_home )
+#define INIT_G() do { \
+ LogLevel = 8; \
+ CDir = CRONTABS; \
+} while (0)
+
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);
-
+static void RunJob(const char *user, CronLine *line);
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
-static void EndJob(const char *user, CronLine * line);
+static void EndJob(const char *user, CronLine *line);
#else
-#define EndJob(user, line) line->cl_Pid = 0
+#define EndJob(user, line) ((line)->cl_Pid = 0)
#endif
-
static void DeleteFile(const char *userName);
-static CronFile *FileBase;
+#define LVL5 "\x05"
+#define LVL7 "\x07"
+#define LVL8 "\x08"
+#define LVL9 "\x09"
+#define WARN9 "\x49"
+#define DIE9 "\xc9"
+/* level >= 20 is "error" */
+#define ERR20 "\x14"
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);
+ int level = (ctl[0] & 0x1f);
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 == NULL) {
- vsyslog(type, fmt, va);
- } else {
-#if !ENABLE_DEBUG_CROND_OPTION
- int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
-#else
+ /* Debug mode: all to (non-redirected) stderr, */
+ /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
+ if (!DebugOpt && LogFile) {
+ /* Otherwise (log to file): we reopen log file at every write: */
int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
-#endif
- if (logfd >= 0) {
- vdprintf(logfd, fmt, va);
- close(logfd);
- }
+ if (logfd >= 0)
+ xmove_fd(logfd, STDERR_FILENO);
}
+// TODO: ERR -> error, WARN -> warning, LVL -> info
+ bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
}
va_end(va);
- if (ctl[0] & 0200) {
+ if (ctl[0] & 0x80)
exit(20);
- }
}
int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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. */
+ INIT_G();
+
+ /* "-b after -f is ignored", and so on for every pair a-b */
+ opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l")
+ ":l+:d+"; /* -l and -d have numeric param */
opt = getopt32(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
+ &LogLevel, &LogFile, &CDir
+ USE_DEBUG_CROND_OPTION(,&LogLevel));
+ /* both -d N and -l N set the same variable: LogLevel */
- /* close stdin and stdout, stderr.
- * close unused descriptors - don't need.
- * optional detach from controlling terminal
- */
- if (!(opt & 4))
+ if (!(opt & OPT_f)) {
+ /* close stdin, stdout, stderr.
+ * close unused descriptors - don't need them. */
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 " BB_VER " started, log level %d\n",
- applet_name, LogLevel);
+ if (!DebugOpt && LogFile == NULL) {
+ /* logging to syslog */
+ openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
+ logmode = LOGMODE_SYSLOG;
+ }
+ xchdir(CDir);
+ //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
+ setenv("SHELL", DEFAULT_SHELL, 1); /* once, for all future children */
+ crondlog(LVL9 "crond (busybox "BB_VER") started, log level %d", LogLevel);
SynchronizeDir();
+ /* main loop - synchronize to 1 second after the minute, minimum sleep
+ * of 1 second. */
{
time_t t1 = time(NULL);
time_t t2;
long dt;
int rescan = 60;
- short sleep_time = 60;
+ int sleep_time = 60;
write_pidfile("/var/run/crond.pid");
for (;;) {
- sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));
+ sleep((sleep_time + 1) - (time(NULL) % sleep_time));
t2 = time(NULL);
- dt = t2 - t1;
+ dt = (long)t2 - (long)t1;
/*
* The file 'cron.update' is checked to determine new cron
@@ -204,19 +222,15 @@ int crond_main(int ac, char **av)
* 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
+ crondlog(LVL5 "wakeup dt=%ld", dt);
if (dt < -60 * 60 || dt > 60 * 60) {
- t1 = t2;
- crondlog("\111time disparity of %d minutes detected\n", dt / 60);
+ crondlog(WARN9 "time disparity of %d minutes detected", dt / 60);
} else if (dt > 0) {
TestJobs(t1, t2);
RunJobs();
@@ -226,66 +240,59 @@ int crond_main(int ac, char **av)
} else {
sleep_time = 60;
}
- t1 = t2;
}
+ t1 = t2;
}
}
return 0; /* not reached */
}
-static int ChangeUser(const char *user)
+#if SETENV_LEAKS
+/* We set environment *before* vfork (because we want to use vfork),
+ * so we cannot use setenv() - repeated calls to setenv() may leak memory!
+ * Using putenv(), and freeing memory after unsetenv() won't leak */
+static void safe_setenv4(char **pvar_val, const char *var, const char *val /*, int len*/)
{
- struct passwd *pas;
- const char *err_msg;
+ const int len = 4; /* both var names are 4 char long */
+ char *var_val = *pvar_val;
- /*
- * Obtain password entry and change privileges
- */
- pas = getpwnam(user);
- if (pas == 0) {
- crondlog("\011failed to get uid for %s", user);
- return -1;
+ if (var_val) {
+ var_val[len] = '\0'; /* nuke '=' */
+ unsetenv(var_val);
+ free(var_val);
}
+ *pvar_val = xasprintf("%s=%s", var, val);
+ putenv(*pvar_val);
+}
+#endif
+
+static void SetEnv(struct passwd *pas)
+{
+#if SETENV_LEAKS
+ safe_setenv4(&env_var_user, "USER", pas->pw_name);
+ safe_setenv4(&env_var_home, "HOME", pas->pw_dir);
+ /* if we want to set user's shell instead: */
+ /*safe_setenv(env_var_user, "SHELL", pas->pw_shell, 5);*/
+#else
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;
+#endif
+ /* currently, we use constant one: */
+ /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
}
-static void startlogger(void)
+static void ChangeUser(struct passwd *pas)
{
- if (LogFile == NULL) {
- 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);
+ /* careful: we're after vfork! */
+ change_identity(pas); /* - initgroups, setgid, setuid */
+ if (chdir(pas->pw_dir) < 0) {
+ crondlog(LVL9 "can't chdir(%s)", pas->pw_dir);
+ if (chdir(TMPDIR) < 0) {
+ crondlog(DIE9 "can't chdir(%s)", TMPDIR); /* exits */
}
}
-#endif
}
-
static const char DowAry[] ALIGN1 =
"sun""mon""tue""wed""thu""fri""sat"
/* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
@@ -308,17 +315,16 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
return NULL;
}
- while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+ while (!isspace(*ptr)) {
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') {
+ } else if (isdigit(*ptr)) {
if (n1 < 0) {
n1 = strtol(ptr, &ptr, 10) + off;
} else {
@@ -344,9 +350,8 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
}
/* handle optional range '-' */
-
if (skip == 0) {
- crondlog("\111failed user %s parsing %s\n", user, base);
+ crondlog(WARN9 "user %s: parse error at %s", user, base);
return NULL;
}
if (*ptr == '-' && n2 < 0) {
@@ -358,18 +363,17 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
* 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;
@@ -382,13 +386,12 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
ary[n1 % modvalue] = 1;
s0 = skip;
}
- }
- while (n1 != n2 && --failsafe);
+ if (--failsafe == 0) {
+ crondlog(WARN9 "user %s: parse error at %s", user, base);
+ return NULL;
+ }
+ } while (n1 != n2);
- if (failsafe == 0) {
- crondlog("\111failed user %s parsing %s\n", user, base);
- return NULL;
- }
}
if (*ptr != ',') {
break;
@@ -398,147 +401,124 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
n2 = -1;
}
- if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
- crondlog("\111failed user %s parsing %s\n", user, base);
+ if (!isspace(*ptr)) {
+ crondlog(WARN9 "user %s: parse error at %s", user, base);
return NULL;
}
- while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
- ++ptr;
- }
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
+ if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */
+ /* can't use crondlog, it inserts '\n' */
int i;
-
- for (i = 0; i < modvalue; ++i) {
- crondlog("\005%d", ary[i]);
- }
- crondlog("\005\n");
+ for (i = 0; i < modvalue; ++i)
+ fprintf(stderr, "%d", (unsigned char)ary[i]);
+ fputc('\n', stderr);
}
-#endif
-
- return ptr;
+ return skip_whitespace(ptr);
}
-static void FixDayDow(CronLine * line)
+static void FixDayDow(CronLine *line)
{
int i;
int weekUsed = 0;
int daysUsed = 0;
- for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Dow)); ++i) {
+ for (i = 0; i < 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) {
+ for (i = 0; i < 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));
+ if (weekUsed != daysUsed) {
+ if (weekUsed)
+ memset(line->cl_Days, 0, sizeof(line->cl_Days));
+ else /* daysUsed */
+ memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
}
}
-
-
static void SynchronizeFile(const char *fileName)
{
- int maxEntries = MAXLINES;
+ FILE *fi;
+ struct stat sbuf;
+ int maxEntries;
int maxLines;
char buf[1024];
+ if (!fileName)
+ return;
+
+ DeleteFile(fileName);
+ fi = fopen(fileName, "r");
+ if (!fi)
+ return;
+
+ maxEntries = MAXLINES;
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);
+ if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
+ CronFile *file = xzalloc(sizeof(CronFile));
+ CronLine **pline;
- /* 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;
+ file->cf_User = xstrdup(fileName);
+ pline = &file->cf_LineBase;
- /* copy command */
- (*pline)->cl_Shell = strdup(ptr);
-
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
- crondlog("\111 Command %s\n", ptr);
- }
-#endif
+ while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
+ CronLine *line;
+ char *ptr;
- pline = &((*pline)->cl_Next);
- }
- *pline = NULL;
+ trim(buf);
+ if (buf[0] == '\0' || buf[0] == '#') {
+ continue;
+ }
+ if (--maxEntries == 0) {
+ break;
+ }
+ if (DebugOpt) {
+ crondlog(LVL5 "user:%s entry:%s", fileName, buf);
+ }
+ *pline = line = xzalloc(sizeof(CronLine));
+ /* 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) {
+ free(line);
+ continue;
+ }
+ /*
+ * fix days and dow - if one is not * and the other
+ * is *, the other is set to 0, and vise-versa
+ */
+ FixDayDow(line);
+ /* copy command */
+ line->cl_Shell = xstrdup(ptr);
+ if (DebugOpt) {
+ crondlog(LVL5 " command:%s", ptr);
+ }
+ pline = &line->cl_Next;
+ }
+ *pline = NULL;
- file->cf_Next = FileBase;
- FileBase = file;
+ file->cf_Next = FileBase;
+ FileBase = file;
- if (maxLines == 0 || maxEntries == 0) {
- crondlog("\111Maximum number of lines reached for user %s\n", fileName);
- }
- }
- fclose(fi);
+ if (maxLines == 0 || maxEntries == 0) {
+ crondlog(WARN9 "maximum number of lines reached for user %s", fileName);
}
}
+ fclose(fi);
}
static void CheckUpdates(void)
@@ -550,6 +530,7 @@ static void CheckUpdates(void)
if (fi != NULL) {
unlink(CRONUPDATE);
while (fgets(buf, sizeof(buf), fi) != NULL) {
+ /* use first word only */
SynchronizeFile(strtok(buf, " \t\r\n"));
}
fclose(fi);
@@ -558,16 +539,14 @@ static void CheckUpdates(void)
static void SynchronizeDir(void)
{
+ CronFile *file;
/* Attempt to delete the database. */
-
- for (;;) {
- CronFile *file;
-
- for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
- if (file == NULL) {
- break;
+ again:
+ for (file = FileBase; file; file = file->cf_Next) {
+ if (!file->cf_Deleted) {
+ DeleteFile(file->cf_User);
+ goto again;
}
- DeleteFile(file->cf_User);
}
/*
@@ -578,41 +557,36 @@ static void SynchronizeDir(void)
*
* scan directory and add associated users
*/
-
unlink(CRONUPDATE);
if (chdir(CDir) < 0) {
- crondlog("\311cannot find %s\n", CDir);
+ crondlog(DIE9 "can't chdir(%s)", 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);
- }
+ if (!dir)
+ crondlog(DIE9 "can't chdir(%s)", "."); /* exits */
+ while ((den = readdir(dir))) {
+ if (strchr(den->d_name, '.') != NULL) {
+ continue;
+ }
+ if (getpwnam(den->d_name)) {
+ SynchronizeFile(den->d_name);
+ } else {
+ crondlog(LVL7 "ignoring %s", den->d_name);
}
- closedir(dir);
- } else {
- crondlog("\311cannot open current dir!\n");
}
+ closedir(dir);
}
}
-
/*
* 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;
@@ -656,7 +630,6 @@ static void DeleteFile(const char *userName)
* 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;
@@ -665,40 +638,37 @@ static int TestJobs(time_t t1, time_t t2)
/* 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;
+ struct tm *tp;
+ CronFile *file;
+ CronLine *line;
- for (file = FileBase; file; file = file->cf_Next) {
-#if ENABLE_DEBUG_CROND_OPTION
+ if (t <= t1)
+ continue;
+
+ tp = localtime(&t);
+ for (file = FileBase; file; file = file->cf_Next) {
+ if (DebugOpt)
+ crondlog(LVL5 "file %s:", file->cf_User);
+ if (file->cf_Deleted)
+ continue;
+ for (line = file->cf_LineBase; line; line = line->cl_Next) {
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;
- }
+ crondlog(LVL5 " line %s", line->cl_Shell);
+ 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 (DebugOpt) {
+ crondlog(LVL5 " job: %d %s",
+ (int)line->cl_Pid, line->cl_Shell);
+ }
+ if (line->cl_Pid > 0) {
+ crondlog(LVL8 "user %s: process already running: %s",
+ file->cf_User, line->cl_Shell);
+ } else if (line->cl_Pid == 0) {
+ line->cl_Pid = -1;
+ file->cf_Ready = 1;
+ ++nJobs;
}
}
}
@@ -713,23 +683,21 @@ static void RunJobs(void)
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);
+ if (!file->cf_Ready)
+ continue;
- 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;
- }
- }
+ file->cf_Ready = 0;
+ for (line = file->cf_LineBase; line; line = line->cl_Next) {
+ if (line->cl_Pid >= 0)
+ continue;
+
+ RunJob(file->cf_User, line);
+ crondlog(LVL8 "USER %s pid %3d cmd %s",
+ file->cf_User, (int)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;
}
}
}
@@ -741,7 +709,6 @@ static void RunJobs(void)
* Check for job completion, return number of jobs still running after
* all done.
*/
-
static int CheckJobs(void)
{
CronFile *file;
@@ -753,18 +720,18 @@ static int CheckJobs(void)
file->cf_Running = 0;
for (line = file->cf_LineBase; line; line = line->cl_Next) {
- if (line->cl_Pid > 0) {
- int status;
- int r = waitpid(line->cl_Pid, &status, WNOHANG);
-
- if (r < 0 || r == line->cl_Pid) {
- EndJob(file->cf_User, line);
- if (line->cl_Pid) {
- file->cf_Running = 1;
- }
- } else if (r == 0) {
+ int status, r;
+ if (line->cl_Pid <= 0)
+ continue;
+
+ r = waitpid(line->cl_Pid, &status, WNOHANG);
+ 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;
}
}
}
@@ -773,45 +740,51 @@ static int CheckJobs(void)
return nStillRunning;
}
-
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+
+// TODO: sendmail should be _run-time_ option, not compile-time!
+
static void
-ForkJob(const char *user, CronLine * line, int mailFd,
+ForkJob(const char *user, CronLine *line, int mailFd,
const char *prog, const char *cmd, const char *arg,
const char *mail_filename)
{
- /* Fork as the user in question and run program */
- pid_t pid = fork();
+ struct passwd *pas;
+ pid_t pid;
- line->cl_Pid = pid;
+ /* prepare things before vfork */
+ pas = getpwnam(user);
+ if (!pas) {
+ crondlog(LVL9 "can't get uid for %s", user);
+ goto err;
+ }
+ SetEnv(pas);
+
+ pid = vfork();
if (pid == 0) {
/* CHILD */
- /* Change running state to the user in question */
-
- if (ChangeUser(user) < 0) {
- exit(0);
- }
-#if ENABLE_DEBUG_CROND_OPTION
+ /* change running state to the user in question */
+ ChangeUser(pas);
if (DebugOpt) {
- crondlog("\005Child Running %s\n", prog);
+ crondlog(LVL5 "child running %s", prog);
}
-#endif
-
if (mailFd >= 0) {
xmove_fd(mailFd, mail_filename ? 1 : 0);
dup2(1, 2);
}
execl(prog, prog, cmd, arg, NULL);
- crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
+ crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user, prog, cmd, arg);
if (mail_filename) {
fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
}
- exit(0);
+ _exit(0);
}
+ line->cl_Pid = pid;
if (pid < 0) {
/* FORK FAILED */
- crondlog("\024cannot fork\n");
+ crondlog(ERR20 "can't vfork");
+ err:
line->cl_Pid = 0;
if (mail_filename) {
unlink(mail_filename);
@@ -822,20 +795,20 @@ ForkJob(const char *user, CronLine * line, int mailFd,
*/
char mailFile2[128];
- snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
+ snprintf(mailFile2, sizeof(mailFile2), "%s/cron.%s.%d", TMPDIR, user, pid);
rename(mail_filename, mailFile2); // TODO: xrename?
}
+
/*
* 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)
+static void RunJob(const char *user, CronLine *line)
{
char mailFile[128];
int mailFd;
@@ -844,8 +817,7 @@ static void RunJob(const char *user, CronLine * line)
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());
+ snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
if (mailFd >= 0) {
@@ -854,7 +826,8 @@ static void RunJob(const char *user, CronLine * line)
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);
+ crondlog(ERR20 "cannot create mail file %s for user %s, "
+ "discarding output", mailFile, user);
}
ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
@@ -863,15 +836,13 @@ static void RunJob(const char *user, CronLine * line)
/*
* EndJob - called when job terminates and when mail terminates
*/
-
-static void EndJob(const char *user, CronLine * line)
+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;
@@ -881,11 +852,10 @@ static void EndJob(const char *user, CronLine * line)
* End of job and no mail file
* End of sendmail job
*/
-
- snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, line->cl_Pid);
+ snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
line->cl_Pid = 0;
- if (line->cl_MailFlag != 1) {
+ if (line->cl_MailFlag == 0) {
return;
}
line->cl_MailFlag = 0;
@@ -894,7 +864,6 @@ static void EndJob(const char *user, CronLine * line)
* 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);
unlink(mailFile);
if (mailFd < 0) {
@@ -910,37 +879,43 @@ static void EndJob(const char *user, CronLine * line)
}
ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
}
-#else
-/* crond without sendmail */
-static void RunJob(const char *user, CronLine * line)
+#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();
+ struct passwd *pas;
+ pid_t pid;
+
+ /* prepare things before vfork */
+ pas = getpwnam(user);
+ if (!pas) {
+ crondlog(LVL9 "can't get uid for %s", user);
+ goto err;
+ }
+ SetEnv(pas);
+ /* fork as the user in question and run program */
+ pid = vfork();
if (pid == 0) {
/* CHILD */
-
- /* Change running state to the user in question */
-
- if (ChangeUser(user) < 0) {
- exit(0);
- }
-#if ENABLE_DEBUG_CROND_OPTION
+ /* change running state to the user in question */
+ ChangeUser(pas);
if (DebugOpt) {
- crondlog("\005Child Running %s\n", DEFAULT_SHELL);
+ crondlog(LVL5 "child running %s", 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) {
+ crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user,
+ DEFAULT_SHELL, "-c", line->cl_Shell);
+ _exit(0);
+ }
+ if (pid < 0) {
/* FORK FAILED */
- crondlog("\024cannot, user %s\n", user);
+ crondlog(ERR20 "can't vfork");
+ err:
pid = 0;
}
line->cl_Pid = pid;
}
+
#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */