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Add support for built-in log rotation from BusyBox syslogd

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Port log rotation from BusyBox syslogd, see SYSLOG_ROTATE_FILES.
This adds support for -b and -c options for size and rotate count.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson 2018-08-02 15:15:14 +02:00
parent aeba1d31b7
commit 039bd99d10
1 changed files with 59 additions and 3 deletions
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62
syslogd.c
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@ -502,6 +502,10 @@ static char sccsid[] = "@(#)syslogd.c 5.27 (Berkeley) 10/10/88";
* Make sure that the service name is only queried, when it is needed,
* i.e. when we are sending to or receiving from the network.
*
* Sun Oct 11 11:28:07 CEST 2009: Joachim Nilsson <troglobit@gmail.com>
* Port log rotation from BusyBox syslogd, see SYSLOG_ROTATE_FILES.
* This adds support for -b and -c options for size and rotate count.
*
* Fri Sep 10 08:29:04 CEST 2010: Martin Schulze <joey@infodrom.org>
* Replace strcpy with memmove to fix continuation line problems
* on 64bit architectures, patch by David Couture.
@ -809,7 +813,10 @@ char **StripDomains = NULL; /* these domains may be stripped before writing logs
char **LocalHosts = NULL; /* these hosts are logged with their hostname */
int NoHops = 1; /* Can we bounce syslog messages through an
intermediate host. */
#ifdef SYSLOG_ROTATE_FILES
int RotateSz = 200 * 1024; /* Max file size (bytes) before rotating, set with -b <SIZE> */
int RotateCnt = 1; /* Max number (count) of log files to keep, set with -c <NUM> */
#endif
extern int errno;
/* Function prototypes. */
@ -904,7 +911,7 @@ int main(argc, argv)
funix[i] = -1;
}
while ((ch = getopt(argc, argv, "46Aa:dhf:l:m:np:rs:v")) != EOF)
while ((ch = getopt(argc, argv, "46Aa:b:c:dhf:l:m:np:rs:v")) != EOF)
switch((char)ch) {
case '4':
family = PF_INET;
@ -923,6 +930,14 @@ int main(argc, argv)
else
fprintf(stderr, "Out of descriptors, ignoring %s\n", optarg);
break;
#ifdef SYSLOG_ROTATE_FILES
case 'b': /* Max file size (bytes) before rotating log file. */
RotateSz = atoi(optarg);
break;
case 'c': /* Number (count) of log files to keep. */
RotateCnt = atoi(optarg);
break;
#endif
case 'd': /* debug */
Debug = 1;
break;
@ -1241,7 +1256,10 @@ int main(argc, argv)
int usage()
{
fprintf(stderr, "usage: syslogd [-46Adrvh] [-l hostlist] [-m markinterval] [-n] [-p path]\n" \
fprintf(stderr, "usage: syslogd [-46Adrvh] [-l hostlist] [-m markinterval] [-n] [-p path]\n"
#ifdef SYSLOG_ROTATE_FILES
" [-b maxlogfilesize] [-c maxrotatecount]"
#endif
" [-s domainlist] [-f conffile]\n");
exit(1);
}
@ -1813,6 +1831,39 @@ void logmsg(pri, msg, from, flags)
} /* balance parentheses for emacs */
#endif
#ifdef SYSLOG_ROTATE_FILES
void logrotate(f)
register struct filed *f;
{
struct stat statf;
fstat(f->f_file, &statf);
/* bug (mostly harmless): can wrap around if file > 4gb */
if (RotateSz && S_ISREG(statf.st_mode) && statf.st_size > RotateSz) {
if (RotateCnt) { /* always 0..99 */
int i = strlen(f->f_un.f_fname) + 3 + 1;
char oldFile[i];
char newFile[i];
i = RotateCnt - 1;
/* rename: f.8 -> f.9; f.7 -> f.8; ... */
while (1) {
sprintf(newFile, "%s.%d", f->f_un.f_fname, i);
if (i == 0) break;
sprintf(oldFile, "%s.%d", f->f_un.f_fname, --i);
/* ignore errors - file might be missing */
rename(oldFile, newFile);
}
/* newFile == "f.0" now */
rename(f->f_un.f_fname, newFile);
close(f->f_file);
f->f_file = open(f->f_un.f_fname, O_WRONLY|O_APPEND|O_CREAT|O_NONBLOCK|O_NOCTTY, 0644);
}
ftruncate(f->f_file, 0);
}
}
#endif /* SYSLOG_ROTATE_FILES */
void fprintlog(f, from, flags, msg)
register struct filed *f;
char *from;
@ -1996,6 +2047,11 @@ void fprintlog(f, from, flags, msg)
if (f->f_file == -1)
break;
#ifdef SYSLOG_ROTATE_FILES
if (f->f_type == F_FILE)
logrotate(f);
#endif
if (writev(f->f_file, iov, 6) < 0) {
int e = errno;