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/*
* log.c
*
* system logging
*/
#include "fd.h"
#include "func.h"
#if MSDOS
#include <process.h>
#endif
#ifndef NOSYSLOG
#include <syslog.h>
#endif
#ifndef LOG_PID
#define LOG_PID 0
#endif
#ifndef LOG_ERR
#define LOG_ERR 3
#endif
#ifndef LOG_INFO
#define LOG_INFO 6
#endif
#ifdef DEP_LOGGING
extern char *progname;
static lockbuf_t *NEAR openlogfile __P_((VOID_A));
static VOID NEAR writelog __P_((int, int, CONST char *));
char *logfile = NULL;
int logsize = 0;
#ifndef NOSYSLOG
int usesyslog = 0;
#endif
int loglevel = 0;
#ifndef NOUID
int rootloglevel = 0;
#endif
static char *logfname = NULL;
#ifndef NOSYSLOG
static int syslogged = 0;
#endif
static lockbuf_t *NEAR openlogfile(VOID_A)
{
lockbuf_t *lck;
struct stat st;
CONST char *home;
char *cp, *top, path[MAXPATHLEN];
ALLOC_T size;
cp = logfname;
if (logfname) {
if (!*logfname) return(NULL);
}
else {
if (!logfile || !*logfile) return(NULL);
logfname = vnullstr;
top = logfile;
#ifdef DEP_DOSPATH
if (_dospath(top)) top += 2;
#endif
if (*top == _SC_) cp = logfile;
else {
if (!(home = gethomedir())) return(NULL);
strcatdelim2(path, home, top);
if (!*path) return(NULL);
cp = Xstrdup(path);
}
}
size = (ALLOC_T)logsize * (ALLOC_T)1024;
if (size > 0 && Xstat(cp, &st) >= 0 && st.st_size > size) {
VOID_C Xsnprintf(path, sizeof(path), "%s.old", cp);
if (Xrename(cp, path) < 0) VOID_C Xunlink(cp);
}
lck = lockopen(cp, O_TEXT | O_WRONLY | O_CREAT | O_APPEND, 0666);
if (!lck) {
Xfree(cp);
return(NULL);
}
logfname = cp;
return(lck);
}
VOID logclose(VOID_A)
{
if (logfname != vnullstr) Xfree(logfname);
logfname = vnullstr;
#ifndef NOSYSLOG
if (syslogged > 0) closelog();
syslogged = -1;
#endif
}
/*ARGSUSED*/
static VOID NEAR writelog(lvl, p, buf)
int lvl, p;
CONST char *buf;
{
static int logging = 0;
lockbuf_t *lck;
struct tm *tm;
char hbuf[MAXLOGLEN + 1];
time_t t;
u_char uc;
int n;
if (logging) return;
#ifndef NOUID
if (!getuid()) {
n = rootloglevel;
lvl--;
}
else
#endif
n = loglevel;
if (!n || n < lvl) return;
logging = 1;
if ((lck = openlogfile())) {
t = time(NULL);
tm = localtime(&t);
#ifdef NOUID
VOID_C Xsnprintf(hbuf, sizeof(hbuf),
"%04u/%02u/%02u %02u:%02u:%02u %s[%d]:\n ",
tm -> tm_year + 1900, tm -> tm_mon + 1, tm -> tm_mday,
tm -> tm_hour, tm -> tm_min, tm -> tm_sec,
progname, getpid());
#else
VOID_C Xsnprintf(hbuf, sizeof(hbuf),
"%04u/%02u/%02u %02u:%02u:%02u uid=%d %s[%d]:\n ",
tm -> tm_year + 1900, tm -> tm_mon + 1, tm -> tm_mday,
tm -> tm_hour, tm -> tm_min, tm -> tm_sec,
getuid(), progname, getpid());
#endif
VOID_C Xwrite(lck -> fd, hbuf, strlen(hbuf));
VOID_C Xwrite(lck -> fd, buf, strlen(buf));
uc = '\n';
VOID_C Xwrite(lck -> fd, (char *)&uc, sizeof(uc));
lockclose(lck);
}
logging = 0;
#ifndef NOSYSLOG
if (usesyslog && syslogged >= 0) {
if (!syslogged) {
syslogged++;
# ifdef LOG_USER
openlog(progname, LOG_PID, LOG_USER);
# else
openlog(progname, LOG_PID);
# endif
}
syslog(p, "%s", buf);
}
#endif /* !NOSYSLOG */
}
#ifdef USESTDARGH
/*VARARGS3*/
VOID logsyscall(int lvl, int val, CONST char *fmt, ...)
#else
/*VARARGS3*/
VOID logsyscall(lvl, val, fmt, va_alist)
int lvl, val;
CONST char *fmt;
va_dcl
#endif
{
va_list args;
char buf[MAXLOGLEN + 1];
int n, len, duperrno;
duperrno = errno;
if (val >= 0) lvl++;
VA_START(args, fmt);
len = Xvsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (len >= 0) {
#ifdef CODEEUC
len = strlen(buf);
#endif
if (val >= 0) n = Xsnprintf(&(buf[len]),
(int)sizeof(buf) - len, " succeeded");
else n = Xsnprintf(&(buf[len]), (int)sizeof(buf) - len,
" -- FAILED -- (%k)", Xstrerror(duperrno));
if (n < 0) buf[len] = '\0';
writelog(lvl, (val < 0) ? LOG_ERR : LOG_INFO, buf);
}
errno = duperrno;
}
#ifdef USESTDARGH
/*VARARGS2*/
VOID logmessage(int lvl, CONST char *fmt, ...)
#else
/*VARARGS2*/
VOID logmessage(lvl, fmt, va_alist)
int lvl;
CONST char *fmt;
va_dcl
#endif
{
va_list args;
char buf[MAXLOGLEN + 1];
int len, duperrno;
duperrno = errno;
VA_START(args, fmt);
len = Xvsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (len >= 0) writelog(lvl, LOG_INFO, buf);
errno = duperrno;
}
#endif /* DEP_LOGGING */
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