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/* $Id: misc.c 9275 2011-07-17 19:09:26Z iulius $
**
** Helper routines for the innfeed program.
**
** Written by James Brister <brister@vix.com>
*/
#include "innfeed.h"
#include "config.h"
#include "clibrary.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <signal.h>
#include <syslog.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <time.h>
/* FIXME: Default to a max length of 256 characters for path names if the
host headers doesn't give better information. Should be replaced by the
code from Stevens. */
#ifndef PATH_MAX
# define PATH_MAX 256
#endif
#include "inn/messages.h"
#include "inn/libinn.h"
#include "endpoint.h"
#include "misc.h"
#include "tape.h"
unsigned int openfds ;
int debuggingOutput ;
unsigned int loggingLevel ;
char **PointersFreedOnExit ;
char *timeToStringFormat = 0;
bool debuggingDump = true ;
extern void (*gPrintInfo) (void) ;
void (*gCleanUp) (void) = 0 ;
/* Log a message to stderr, called from warn or die. Mostly the same as the
standard message_log_stderr, but prepends the date to each line. */
void
error_log_stderr_date(int len UNUSED, const char *fmt, va_list args, int err)
{
char timebuff[30];
time_t now;
struct tm *tm;
now = time(NULL);
tm = localtime(&now);
strftime(timebuff, sizeof(timebuff), "%Y-%m-%d %H:%M:%S", tm);
fprintf(stderr, "%s %s: ", timebuff,
(message_program_name ? message_program_name : "UNKNOWN"));
vfprintf(stderr, fmt, args);
if (err) fprintf(stderr, ": %s", strerror(err));
fprintf(stderr, "\n");
}
/* If desired, print out the state of innfeed, call a cleanup function, and
then dump core. Used as an exit handler for die. */
void
dump_core(void)
{
#if SNAPSHOT_ON_DIE
if (debuggingDump && gPrintInfo != NULL)
(*gPrintInfo)();
#endif
if (gCleanUp != NULL)
(*gCleanUp)();
chdir(getTapeDirectory());
sleep(5);
abort();
}
/* An alternate version of die, used when we don't want to dump core. This
should somehow eventually be phased out to simplify things; it's
basically a copy of die() from lib/error.c that ignores the cleanup
handler and has innfeed's handlers hard-coded (ugh). */
void
logAndExit(int status, const char *format, ...)
{
va_list args;
int length;
va_start(args, format);
length = vsnprintf(NULL, 0, format, args);
va_end(args);
va_start(args, format);
error_log_stderr_date(length, format, args, 0);
va_end(args);
va_start(args, format);
message_log_syslog_err(length, format, args, 0);
va_end(args);
exit(status);
}
void d_printf (unsigned int level, const char *fmt, ...)
{
static pid_t myPid ;
char timeString [30] ;
time_t now ;
struct tm *tm ;
va_list ap ;
if (myPid == 0)
myPid = getpid () ;
if (loggingLevel < level)
return ;
now = theTime() ;
tm = localtime (&now);
strftime (timeString, sizeof(timeString), "%b %d %H:%M:%S", tm);
va_start (ap, fmt) ;
fprintf (stderr, "%s %s[%ld]: ",timeString,
(message_program_name ? message_program_name : "UNKNOWN"),
(long) myPid) ;
vfprintf (stderr, fmt, ap) ;
va_end (ap) ;
}
void logOrPrint (int level, FILE *fp, const char *fmt, ...)
{
va_list ap ;
va_start (ap,fmt) ;
if (fp != NULL)
{
vfprintf (fp,fmt,ap) ;
fputc ('\n',fp) ;
}
else
{
char buffer [512] ; /* gag me */
vsnprintf (buffer,sizeof (buffer),fmt,ap) ;
syslog (level,"%s",buffer) ;
}
va_end (ap) ;
}
/* return true if the file exists and is a regular file. */
bool fileExistsP (const char *filename)
{
struct stat buf ;
if (stat (filename,&buf) < 0)
return false ;
return (S_ISREG (buf.st_mode) ? true : false) ;
}
bool isDirectory (const char *filename)
{
struct stat buf ;
if (stat (filename,&buf) < 0)
return false ;
return (S_ISDIR (buf.st_mode) ? true : false) ;
}
bool getNntpResponse (char *p, int *code, char **rest)
{
bool rval = true ;
int cd = 0 ;
int digits = 0 ;
if (rest)
*rest = 0 ;
*code = 0 ;
if (p == NULL)
return false ;
while (*p && isspace((unsigned char) *p))
p++ ;
while (*p && isdigit((unsigned char) *p))
{
digits++ ;
cd = (cd * 10) + (*p - '0') ;
p++ ;
}
if (digits != 3)
return false ;
if (*p == '-')
p++ ;
while (*p && isspace((unsigned char) *p))
p++ ;
if (rest)
*rest = p ;
*code = cd ;
return rval ;
}
/* Pull out a message id from a response on to a streaming command */
char *getMsgId (const char *p)
{
const char *q ;
char *rval ;
while (*p && isspace((unsigned char) *p)) p++ ;
while (*p && !isspace((unsigned char) *p)) p++ ; /* skip response code */
while (*p && isspace((unsigned char) *p)) p++ ;
if ( *p == '\0' )
return NULL ;
q = p ;
while ( *q && !isspace((unsigned char) *q) )
q++ ;
rval = xstrndup (p, q - p) ;
return rval ;
}
char *findNonBlankString (char *ptr, char **tail)
{
char *p, *q ;
for (p = ptr ; *p && isspace((unsigned char) *p) ; p++)
/* nada */ ;
if ( ! *p )
return NULL ;
for (q = p ; *q && !isspace((unsigned char) *q) ; q++)
/* nada */ ;
*tail = q ;
return p ;
}
/* strtok can't handle zero length tokens. */
char *mystrtok (char *line, const char *sep)
{
static char *newPoint ;
char *oldline ;
if (line == NULL && newPoint == NULL)
return NULL ;
if (line != NULL)
{
oldline = line ;
while (*line != '\0' && strchr (sep,*line) == NULL)
line++ ;
if (*line == '\0')
newPoint = NULL ;
else
{
newPoint = line + 1 ;
*line = '\0' ;
}
}
else
{
if (newPoint == NULL)
return NULL ;
oldline = newPoint ;
line = oldline ;
while (*line != '\0' && strchr (sep,*line) == NULL)
line++ ;
if (*line == '\0')
newPoint = NULL ;
else
{
newPoint = line + 1 ;
*line = '\0' ;
}
}
return oldline ;
}
void trim_ws (char *string)
{
char *p ;
unsigned int len ;
assert (string != NULL) ;
len = strlen (string) ;
if (len == 0)
return ;
for (p = string + len - 1 ; p >= string && isspace((unsigned char) *p) ; p--)
/* nada */ ;
*++p = '\0' ;
}
#if 0
/* Scribble on top of memory we're about to free. */
void deadBeef (void *base, size_t byteCount)
{
unsigned char *b = (unsigned char *) base ;
int i ;
#if 0
memset (base, 0, byteCount) ;
#else
assert (b != NULL) ;
for (i = 0 ; i < ((int) byteCount) - 4 ; i += 4)
{
#if 0
*((int *) (b + i)) = 0xdeadbeef ;
#else
b [i + 0] = (unsigned char) 0xde ;
b [i + 1] = (unsigned char) 0xad ;
b [i + 2] = (unsigned char) 0xbe ;
b [i + 3] = (unsigned char) 0xef ;
#endif
}
switch (byteCount % 4)
{
case 0:
*(b + i + 3) = (unsigned char) 0xef ;
case 3:
*(b + i + 2) = (unsigned char) 0xbe ;
case 2:
*(b + i + 1) = (unsigned char) 0xad ;
case 1:
*b = (unsigned char) 0xde ;
}
#endif
}
#endif
/* Not using plain flock or lockf 'cause I don't want to waste file
descriptors. This routine is based on the file shlock.c from INN. */
bool lockFile (const char *fileName)
{
char buff [20] ;
char tmpName [PATH_MAX], realName [PATH_MAX] ;
char *p ;
int fd, i ;
pid_t pid = getpid () ;
strlcpy (realName,fileName,sizeof (realName)) ;
if ((p = strrchr (realName, '/')) != NULL)
{
*p = '\0' ;
snprintf (tmpName, sizeof(tmpName), "%s/lockf%ld", realName,
(long) pid) ;
*p = '/' ;
}
else
snprintf (tmpName, sizeof(tmpName), "lockf%ld", (long) pid) ;
/* Create the temporary name for the lock file. */
while ((fd = open (tmpName, O_RDWR | O_CREAT | O_EXCL, 0644)) < 0)
{
switch (errno)
{
default:
unlink (tmpName) ;
syswarn ("ME lock file open: %s", tmpName) ;
return false ;
case EEXIST:
if (unlink (tmpName) < 0)
{
syswarn ("ME lock file unlink: %s", tmpName) ;
return false ;
}
break;
}
}
/* stick our pid in the temp file. */
snprintf (buff,sizeof(buff),"%ld\n",(long) pid) ;
if (write (fd,buff,(size_t) strlen (buff)) != (int) strlen (buff))
{
syswarn ("ME lock file pid-write") ;
close (fd) ;
unlink (tmpName) ;
return false ;
}
close (fd) ;
/* now link the real name to the temp file. */
while (link (tmpName,realName) < 0)
{
switch (errno)
{
default: /* opps. bailing out. */
syswarn ("ME lock file link: %s", realName) ;
unlink (tmpName) ;
return false ;
case EEXIST:
/* the real lock file exists. So pull out the pid in there and
see if that process is still alive. */
if ((fd = open (realName,O_RDONLY)) < 0)
{
syswarn ("ME lock file open: %s", realName) ;
unlink (tmpName) ;
return false ;
}
if ((i = read (fd,buff,sizeof (buff) - 1)) <= 0)
{
close (fd) ;
unlink (tmpName) ;
return false ;
}
close (fd) ;
buff [i] = '\0' ;
pid = (pid_t) atol (buff) ;
if (pid <= 0)
{
warn ("ME lock bad-pid info in %s: %s", realName, buff) ;
unlink (tmpName) ;
return false ;
}
/* now send a null signal to the process named inside to see if
it's still alive. */
if (kill (pid,0) == 0)
{
warn ("ME lock in-use already: %s by pid %ld", realName,
(unsigned long) pid);
unlink (tmpName) ;
return false ; /* process is still alive */
}
/* process that took out the lock is gone */
if (unlink (realName) < 0)
{
syswarn ("ME lock file unlink: %s", realName) ;
unlink (tmpName) ;
return false ;
}
}
}
unlink (tmpName) ;
return true ;
}
void unlockFile (const char *lockfile)
{
unlink (lockfile) ;
}
bool endsIn (const char *string, const char *tail)
{
size_t len = strlen (tail) ;
size_t slen = strlen (string) ;
if (slen < len)
return false ;
else if (strcmp (string + slen - len, tail) == 0)
return true ;
else
return false ;
}
/* append the contents of src to dest. src is removed if append if
successful */
bool appendFile (const char *dest, const char *src)
{
FILE *inTmp, *outTmp ;
char buff [BUFSIZ] ;
size_t rval ;
/* append the outputFilename file to the inputFilename file */
if ((outTmp = fopen (dest, "a")) == NULL)
die ("fopen (%s): %s",dest, strerror (errno)) ;
if ((inTmp = fopen (src, "r")) == NULL)
die ("fopen (%s): %s",src, strerror (errno)) ;
while ((rval = fread (buff,sizeof (char),BUFSIZ,inTmp)) > 0)
{
if (fwrite (buff,sizeof (char), rval, outTmp) != rval)
die ("fwrite: %s", strerror (errno)) ;
}
if (ferror (inTmp))
die ("Error on inTmp in newTape") ;
if (ferror (outTmp))
die ("Error on outTmp in newTape") ;
if (fclose (inTmp) != 0)
die ("fclose (inTmp): appendFile (%s,%s): %s",dest,src,strerror (errno)) ;
if (fclose (outTmp) != 0)
die ("fclose (outTmp): appendFile (%s,%s): %s",dest,src,strerror (errno)) ;
if (unlink (src) != 0)
die ("unlink (%s): %s", src, strerror (errno)) ;
return true ;
}
/* return true if file1 is older than file2 */
bool isOlder (const char *file1, const char *file2)
{
struct stat buf1 ;
struct stat buf2 ;
if (stat (file1,&buf1) < 0)
return false ;
if (stat (file2,&buf2) < 0)
return false ;
return ((buf1.st_mtime < buf2.st_mtime) ? true : false) ;
}
void freeCharP (char *charp)
{
free (charp) ;
}
/* return the length of the file reference by the given file descriptor */
long fileLength (int fd)
{
struct stat buf ;
if (fstat (fd,&buf) < 0)
return false ;
return ((long) buf.st_size) ;
}
const char *boolToString (bool val)
{
return val ? "true" : "false" ;
}
char* timeToString(time_t t, char* buffer, size_t size)
{
static const char defaultFormat[] = "%a %b %d %H:%M:%S %Y" ;
const struct tm *const tm = localtime(&t);
strftime (buffer, size,
timeToStringFormat == 0 ? defaultFormat : timeToStringFormat, tm);
return buffer;
}
void addPointerFreedOnExit (char *pointerToFree)
{
static int totalPointers = 0 ;
static int nextPointer = 0 ;
if (nextPointer == 0 || nextPointer == totalPointers - 1)
{
int i;
totalPointers += 16 ;
if (PointersFreedOnExit == NULL)
PointersFreedOnExit = xmalloc (sizeof(char *) * totalPointers) ;
else
PointersFreedOnExit =
xrealloc (PointersFreedOnExit, sizeof(char *) * totalPointers) ;
for (i = nextPointer; i < totalPointers; i++)
PointersFreedOnExit [i] = NULL;
}
PointersFreedOnExit [nextPointer++] = pointerToFree ;
}
/* borrows heavily from the shrinkfile program by chongo. */
bool shrinkfile (FILE *fp, long size, char *name, const char *mode)
{
long currlen = ftello (fp) ;
char *tmpname ;
char buffer [BUFSIZ] ;
FILE *tmpFp ;
int c ;
int i ;
int fd ;
if (currlen <= size)
{
d_printf (1,"No need to shrink file (%s %ld vs %ld\n",
name,size,currlen) ;
return true ;
}
/* create a temp file. */
tmpname = concat (name,".XXXXXX",(char *)0) ;
fd = mkstemp (tmpname) ;
if (fd < 0)
{
syswarn ("ME error creating temp shrink file for %s", name) ;
free (tmpname) ;
return false ;
}
if ((tmpFp = fdopen (fd,"w")) == NULL)
{
syswarn ("ME error opening temp shrink file %s", tmpname) ;
free (tmpname) ;
return false ;
}
if (fseeko (fp,currlen - size,SEEK_SET) != 0)
{
fclose (tmpFp) ;
warn ("ME error seeking to point %ld in %s", currlen - size, name) ;
free (tmpname) ;
return false ;
}
/* find the end of the next line in the shrinking file. */
while ((c = fgetc (fp)) != '\n')
if (c == EOF)
{
warn ("ME no newline in shrinking file %s", name) ;
fclose (tmpFp) ;
fseeko (fp,currlen,SEEK_SET) ;
free (tmpname) ;
return false ;
}
/* copy the tail of the shrinking file to the temp file. */
while ((i = fread (buffer,1,sizeof (buffer),fp)) > 0)
{
if (fwrite (buffer,1,i,tmpFp) != (size_t) i)
{
fclose (tmpFp) ;
syswarn ("ME fwrite failed to temp shrink file %s", tmpname) ;
fseeko (fp,currlen, SEEK_SET) ;
free (tmpname) ;
return false ;
}
}
if (i < 0)
logAndExit (1,"ME fread failed on file %s: %s",name, strerror (errno)) ;
fclose (tmpFp) ;
if (unlink (name) != 0)
logAndExit (1,"ME oserr unlink %s: %s",name, strerror (errno)) ;
/* we're in the same directory so this is ok. */
if (rename (tmpname,name) != 0)
logAndExit (1,"ME oserr rename %s, %s: %s", tmpname, name,
strerror (errno)) ;
if (freopen (name,mode,fp) != fp)
logAndExit (1,"ME freopen on shrink file failed %s: %s", name,
strerror (errno)) ;
fseeko (fp,0,SEEK_END) ;
size = ftello (fp) ;
notice ("ME file %s shrunk from %ld to %ld", name, currlen, size) ;
free (tmpname) ;
return true ;
}
long pathMax (const char *pathname UNUSED)
{
static long rval = 0 ;
if (rval > 0)
return rval ;
#if defined (PATH_MAX)
rval = PATH_MAX ;
#elif defined (_POSIX_PATH_MAX)
rval = _POSIX_PATH_MAX ;
#elif defined (DO_HAVE_PATHCONF) && defined (_PC_PATH_MAX)
if (pathname == NULL)
pathname = "/tmp" ;
rval = pathconf (pathname,_PC_PATH_MAX) ;
#else
rval = 255 ;
if (!logged)
{
syslog (LOG_ERR,NO_PATH_MAX,rval) ;
logged = true ;
}
#endif
return rval ;
}
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