NetBSD/libexec/crond/misc.c

730 lines
14 KiB
C

/* Copyright 1988,1990,1993 by Paul Vixie
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie, 3477 South Court, Palo Alto, CA, 94306, USA, +1 415 858 2736
* paul@vix.com || paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl}!vixie!paul
*/
#ifndef lint
static char rcsid[] = "$Id: misc.c,v 1.8 1993/12/06 03:36:04 cgd Exp $";
#endif /* not lint */
#include "cron.h"
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <errno.h>
#if defined(ATT)
# include <fcntl.h>
#endif
#if defined(SYSLOG)
# include <syslog.h>
#endif
void log_it(), be_different(), acquire_daemonlock();
char *
savestr(str)
char *str;
{
extern char *malloc(), *strcpy();
/**/ char *temp;
temp = malloc((unsigned) (strlen(str) + 1));
(void) strcpy(temp, str);
return temp;
}
int
nocase_strcmp(left, right)
char *left;
char *right;
{
while (*left && (MkLower(*left) == MkLower(*right)))
{
left++;
right++;
}
return MkLower(*left) - MkLower(*right);
}
int
strcmp_until(left, right, until)
char *left;
char *right;
char until;
{
register int diff;
Debug(DPARS|DEXT, ("strcmp_until(%s,%s,%c) ... ", left, right, until))
while (*left && *left != until && *left == *right)
{
left++;
right++;
}
if ( (*left=='\0' || *left == until)
&& (*right=='\0' || *right == until)
)
diff = 0;
else
diff = *left - *right;
Debug(DPARS|DEXT, ("%d\n", diff))
return diff;
}
/* strdtb(s) - delete trailing blanks in string 's' and return new length
*/
int
strdtb(s)
register char *s;
{
register char *x = s;
/* scan forward to the null
*/
while (*x)
x++;
/* scan backward to either the first character before the string,
* or the last non-blank in the string, whichever comes first.
*/
do {x--;}
while (x >= s && isspace(*x));
/* one character beyond where we stopped above is where the null
* goes.
*/
*++x = '\0';
/* the difference between the position of the null character and
* the position of the first character of the string is the length.
*/
return x - s;
}
int
set_debug_flags(flags)
char *flags;
{
/* debug flags are of the form flag[,flag ...]
*
* if an error occurs, print a message to stdout and return FALSE.
* otherwise return TRUE after setting ERROR_FLAGS.
*/
#if !DEBUGGING
printf("this program was compiled without debugging enabled\n");
return FALSE;
#else /* DEBUGGING */
char *pc = flags;
DebugFlags = 0;
while (*pc)
{
char **test;
int mask;
/* try to find debug flag name in our list.
*/
for ( test = DebugFlagNames, mask = 1;
*test && strcmp_until(*test, pc, ',');
test++, mask <<= 1
)
;
if (!*test)
{
fprintf(stderr,
"unrecognized debug flag <%s> <%s>\n",
flags, pc);
return FALSE;
}
DebugFlags |= mask;
/* skip to the next flag
*/
while (*pc && *pc != ',')
pc++;
if (*pc == ',')
pc++;
}
if (DebugFlags)
{
int flag;
fprintf(stderr, "debug flags enabled:");
for (flag = 0; DebugFlagNames[flag]; flag++)
if (DebugFlags & (1 << flag))
fprintf(stderr, " %s", DebugFlagNames[flag]);
fprintf(stderr, "\n");
}
return TRUE;
#endif /* DEBUGGING */
}
#if defined(BSD)
void
set_cron_uid()
{
int seteuid();
if (seteuid(ROOT_UID) < OK)
{
perror("seteuid");
exit(ERROR_EXIT);
}
}
#endif
#if defined(ATT)
void
set_cron_uid()
{
int setuid();
if (setuid(ROOT_UID) < OK)
{
perror("setuid");
exit(ERROR_EXIT);
}
}
#endif
void
set_cron_cwd()
{
extern int errno;
struct stat sb;
/* first check for CRONDIR ("/var/cron" or some such)
*/
if (stat(CRONDIR, &sb) < OK && errno == ENOENT) {
perror(CRONDIR);
if (OK == mkdir(CRONDIR, 0700)) {
fprintf(stderr, "%s: created\n", CRONDIR);
stat(CRONDIR, &sb);
} else {
fprintf(stderr, "%s: ", CRONDIR);
perror("mkdir");
exit(ERROR_EXIT);
}
}
if (!(sb.st_mode & S_IFDIR)) {
fprintf(stderr, "'%s' is not a directory, bailing out.\n",
CRONDIR);
exit(ERROR_EXIT);
}
if (chdir(CRONDIR) < OK) {
fprintf(stderr, "cannot chdir(%s), bailing out.\n", CRONDIR);
perror(CRONDIR);
exit(ERROR_EXIT);
}
/* CRONDIR okay (now==CWD), now look at SPOOL_DIR ("tabs" or some such)
*/
if (stat(SPOOL_DIR, &sb) < OK && errno == ENOENT) {
perror(SPOOL_DIR);
if (OK == mkdir(SPOOL_DIR, 0700)) {
fprintf(stderr, "%s: created\n", SPOOL_DIR);
stat(SPOOL_DIR, &sb);
} else {
fprintf(stderr, "%s: ", SPOOL_DIR);
perror("mkdir");
exit(ERROR_EXIT);
}
}
if (!(sb.st_mode & S_IFDIR)) {
fprintf(stderr, "'%s' is not a directory, bailing out.\n",
SPOOL_DIR);
exit(ERROR_EXIT);
}
}
#if defined(BSD)
void
be_different()
{
/* release the control terminal:
* get new pgrp (name after our PID)
* do an IOCTL to void tty association
*/
extern int getpid(), setpgrp(), close();
auto int fd;
(void) setpgrp(0, getpid());
if ((fd = open("/dev/tty", 2)) >= 0)
{
(void) ioctl(fd, TIOCNOTTY, (char*)0);
(void) close(fd);
}
}
#endif /*BSD*/
#if defined(ATT)
void
be_different()
{
/* not being a system V wiz, I don't know if this is what you have
* to do to release your control terminal. what I want to accomplish
* is to keep this process from getting any signals from the tty.
*
* some system V person should let me know if this works... (vixie)
*/
int setpgrp(), close(), open();
(void) setpgrp();
(void) close(STDIN); (void) open("/dev/null", 0);
(void) close(STDOUT); (void) open("/dev/null", 1);
(void) close(STDERR); (void) open("/dev/null", 2);
}
#endif /*ATT*/
/* acquire_daemonlock() - write our PID into /etc/crond.pid, unless
* another daemon is already running, which we detect here.
*/
void
acquire_daemonlock()
{
char pidfile[MAX_FNAME];
FILE *fp;
int fd, pid = getpid(), otherpid;
char buf[MAX_TEMPSTR];
(void) sprintf(pidfile, PIDFILE, PIDDIR);
if ((-1 == (fd = open(pidfile, O_RDWR|O_CREAT, 0644)))
|| (NULL == (fp = fdopen(fd, "r+")))
) {
sprintf(buf, "can't open or create %s: %s",
pidfile, strerror(errno));
log_it("CROND", pid, "DEATH", buf);
exit(ERROR_EXIT);
}
if (flock(fd, LOCK_EX|LOCK_NB) < OK) {
int save_errno = errno;
fscanf(fp, "%d", &otherpid);
sprintf(buf, "can't lock %s, otherpid may be %d: %s",
pidfile, otherpid, strerror(save_errno));
log_it("CROND", pid, "DEATH", buf);
exit(ERROR_EXIT);
}
rewind(fp);
fprintf(fp, "%d\n", pid);
fflush(fp);
(void) ftruncate(fd, ftell(fp));
(void) fcntl(fd, F_SETFD, 1);
/* abandon fd and fp even though the file is open. we need to
* keep it open and locked, but we don't need the handles elsewhere.
*/
}
/* get_char(file) : like getc() but increment LineNumber on newlines
*/
int
get_char(file)
FILE *file;
{
int ch;
ch = getc(file);
if (ch == '\n')
Set_LineNum(LineNumber + 1)
return ch;
}
/* unget_char(ch, file) : like ungetc but do LineNumber processing
*/
void
unget_char(ch, file)
int ch;
FILE *file;
{
ungetc(ch, file);
if (ch == '\n')
Set_LineNum(LineNumber - 1)
}
/* get_string(str, max, file, termstr) : like fgets() but
* (1) has terminator string which should include \n
* (2) will always leave room for the null
* (3) uses get_char() so LineNumber will be accurate
* (4) returns EOF or terminating character, whichever
*/
int
get_string(string, size, file, terms)
char *string;
int size;
FILE *file;
char *terms;
{
int ch;
char *index();
while (EOF != (ch = get_char(file)) && !index(terms, ch))
if (size > 1)
{
*string++ = (char) ch;
size--;
}
if (size > 0)
*string = '\0';
return ch;
}
/* skip_comments(file) : read past comment (if any)
*/
void
skip_comments(file)
FILE *file;
{
int ch;
while (EOF != (ch = get_char(file)))
{
/* ch is now the first character of a line.
*/
while (ch == ' ' || ch == '\t')
ch = get_char(file);
if (ch == EOF)
break;
/* ch is now the first non-blank character of a line.
*/
if (ch != '\n' && ch != '#')
break;
/* ch must be a newline or comment as first non-blank
* character on a line.
*/
while (ch != '\n' && ch != EOF)
ch = get_char(file);
/* ch is now the newline of a line which we're going to
* ignore.
*/
}
unget_char(ch, file);
}
/* int in_file(char *string, FILE *file)
* return TRUE if one of the lines in file matches string exactly,
* FALSE otherwise.
*/
int
in_file(string, file)
char *string;
FILE *file;
{
char line[MAX_TEMPSTR];
/* let's be persnickety today.
*/
if (!file) {
if (!string)
string = "0x0";
fprintf(stderr,
"in_file(\"%s\", 0x%x): called with NULL file--botch",
string, file);
exit(ERROR_EXIT);
}
rewind(file);
while (fgets(line, MAX_TEMPSTR, file)) {
if (line[0] != '\0')
line[strlen(line)-1] = '\0';
if (0 == strcmp(line, string))
return TRUE;
}
return FALSE;
}
/* int allowed(char *username)
* returns TRUE if (ALLOW_FILE exists and user is listed)
* or (DENY_FILE exists and user is NOT listed)
* or (neither file exists but user=="root" so it's okay)
*/
int
allowed(username)
char *username;
{
static int init = FALSE;
static FILE *allow, *deny;
if (!init) {
init = TRUE;
#if defined(ALLOW_FILE) && defined(DENY_FILE)
allow = fopen(ALLOW_FILE, "r");
deny = fopen(DENY_FILE, "r");
Debug(DMISC, ("allow/deny enabled, %d/%d\n", !!allow, !!deny))
#else
allow = NULL;
deny = NULL;
#endif
}
if (allow)
return (in_file(username, allow));
if (deny)
return (!in_file(username, deny));
#if defined(ALLOW_ONLY_ROOT)
return (strcmp(username, ROOT_USER) == 0);
#else
return TRUE;
#endif
}
void
log_it(username, pid, event, detail)
char *username;
int pid;
char *event;
char *detail;
{
#if defined(LOG_FILE)
extern struct tm *localtime();
extern long time();
extern char *malloc();
auto char *msg;
auto long now = time((long *) 0);
register struct tm *t = localtime(&now);
static int log_fd = -1;
#endif /*LOG_FILE*/
#if defined(SYSLOG)
static int syslog_open = 0;
#endif
#if defined(LOG_FILE)
/* we assume that MAX_TEMPSTR will hold the date, time, &punctuation.
*/
msg = malloc(strlen(username)
+ strlen(event)
+ strlen(detail)
+ MAX_TEMPSTR);
if (log_fd < OK) {
log_fd = open(LOG_FILE, O_WRONLY|O_APPEND|O_CREAT, 0600);
if (log_fd < OK) {
fprintf(stderr, "%s: can't open log file\n",
ProgramName);
perror(LOG_FILE);
} else {
(void) fcntl(log_fd, F_SETFD, 1);
}
}
/* we have to sprintf() it because fprintf() doesn't always write
* everything out in one chunk and this has to be atomically appended
* to the log file.
*/
sprintf(msg, "%s (%02d/%02d-%02d:%02d:%02d-%d) %s (%s)\n",
username,
t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, pid,
event, detail);
/* we have to run strlen() because sprintf() returns (char*) on BSD
*/
if (log_fd < OK || write(log_fd, msg, strlen(msg)) < OK) {
fprintf(stderr, "%s: can't write to log file\n", ProgramName);
if (log_fd >= OK)
perror(LOG_FILE);
write(STDERR, msg, strlen(msg));
}
/* I suppose we could use alloca()...
*/
free(msg);
#endif /*LOG_FILE*/
#if defined(SYSLOG)
if (!syslog_open) {
/* we don't use LOG_PID since the pid passed to us by
* our client may not be our own. therefore we want to
* print the pid ourselves.
*/
# ifdef LOG_CRON
openlog(ProgramName, 0, LOG_CRON);
# else
# ifdef LOG_DAEMON
openlog(ProgramName, 0, LOG_DAEMON);
# else
openlog(ProgramName, 0);
# endif /*LOG_DAEMON*/
# endif /*LOG_CRON*/
syslog_open = TRUE; /* assume openlog success */
}
syslog(LOG_INFO, "(%s %d) %s (%s)\n",
username, pid, event, detail);
#endif /*SYSLOG*/
#if DEBUGGING
if (DebugFlags) {
fprintf(stderr, "log_it: (%s %d) %s (%s)",
username, pid, event, detail);
}
#endif
}
/* two warnings:
* (1) this routine is fairly slow
* (2) it returns a pointer to static storage
*/
char *
first_word(s, t)
local char *s; /* string we want the first word of */
local char *t; /* terminators, implicitly including \0 */
{
static char retbuf[2][MAX_TEMPSTR + 1]; /* sure wish I had GC */
static int retsel = 0;
local char *rb, *rp;
extern char *index();
/* select a return buffer */
retsel = 1-retsel;
rb = &retbuf[retsel][0];
rp = rb;
/* skip any leading terminators */
while (*s && (NULL != index(t, *s))) {s++;}
/* copy until next terminator or full buffer */
while (*s && (NULL == index(t, *s)) && (rp < &rb[MAX_TEMPSTR])) {
*rp++ = *s++;
}
/* finish the return-string and return it */
*rp = '\0';
return rb;
}
/* warning:
* heavily ascii-dependent.
*/
void
mkprint(dst, src, len)
register char *dst;
register unsigned char *src;
register int len;
{
while (len-- > 0)
{
register unsigned char ch = *src++;
if (ch < ' ') { /* control character */
*dst++ = '^';
*dst++ = ch + '@';
} else if (ch < 0177) { /* printable */
*dst++ = ch;
} else if (ch == 0177) { /* delete/rubout */
*dst++ = '^';
*dst++ = '?';
} else { /* parity character */
sprintf(dst, "\\%03o", ch);
dst += 4;
}
}
*dst = NULL;
}
/* warning:
* returns a pointer to malloc'd storage, you must call free yourself.
*/
char *
mkprints(src, len)
register unsigned char *src;
register unsigned int len;
{
extern char *malloc();
register char *dst = malloc(len*4 + 1);
mkprint(dst, src, len);
return dst;
}
/* Sat, 27 Feb 93 11:44:51 CST
* 123456789012345678901234567
*/
char *
arpadate(
time_t *clock
) {
time_t t = clock ?*clock :time(NULL);
struct tm *tm = localtime(&t);
static char ret[30]; /* zone name might be >3 chars */
(void) sprintf(ret, "%s, %2d %s %2d %02d:%02d:%02d %s",
DowNames[tm->tm_wday],
tm->tm_mday,
MonthNames[tm->tm_mon],
tm->tm_year,
tm->tm_hour,
tm->tm_min,
tm->tm_sec,
tm->tm_zone);
return ret;
}