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/* util.c ....... error message utilities.
* C. Scott Ananian <cananian@alumni.princeton.edu>
*
* $Id: util.c,v 1.13 2011/12/19 07:15:03 quozl Exp $
*/
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <unistd.h>
#include <stdlib.h>
#include "util.h"
#ifndef PROGRAM_NAME
#define PROGRAM_NAME "pptp"
#endif
/* implementation of log_string, defined as extern in util.h */
const char *log_string = "anon";
static void open_log(void) __attribute__ ((constructor));
static void close_log(void) __attribute__ ((destructor));
#define MAKE_STRING(label) \
va_list ap; \
char buf[256], string[256]; \
va_start(ap, format); \
vsnprintf(buf, sizeof(buf), format, ap); \
snprintf(string, sizeof(string), "%s %s[%s:%s:%d]: %s", \
log_string, label, func, file, line, buf); \
va_end(ap)
/*** open log *****************************************************************/
static void open_log(void) {
openlog(PROGRAM_NAME, LOG_PID, LOG_DAEMON);
}
/*** close log ****************************************************************/
static void close_log(void)
{
closelog();
}
/*** print a message to syslog ************************************************/
void _log(const char *func, const char *file, int line, const char *format, ...)
{
MAKE_STRING("log");
syslog(LOG_NOTICE, "%s", string);
}
/*** print a warning to syslog ************************************************/
void _warn(const char *func, const char *file, int line, const char *format, ...)
{
MAKE_STRING("warn");
fprintf(stderr, "%s\n", string);
syslog(LOG_WARNING, "%s", string);
}
/*** print a fatal warning to syslog and exit *********************************/
void _fatal(const char *func, const char *file, int line, const char *format, ...)
{
MAKE_STRING("fatal");
fprintf(stderr, "%s\n", string);
syslog(LOG_CRIT, "%s", string);
exit(1);
}
/*** connect a file to a file descriptor **************************************/
int file2fd(const char *path, const char *mode, int fd)
{
int ok = 0;
FILE *file = NULL;
file = fopen(path, mode);
if (file != NULL && dup2(fileno(file), fd) != -1)
ok = 1;
if (file) fclose(file);
return ok;
}
/* signal to pipe delivery implementation */
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
/* pipe private to process */
static int sigpipe[2];
/* create a signal pipe, returns 0 for success, -1 with errno for failure */
int sigpipe_create(void)
{
int rc;
rc = pipe(sigpipe);
if (rc < 0) return rc;
fcntl(sigpipe[0], F_SETFD, FD_CLOEXEC);
fcntl(sigpipe[1], F_SETFD, FD_CLOEXEC);
#ifdef O_NONBLOCK
#define FLAG_TO_SET O_NONBLOCK
#else
#ifdef SYSV
#define FLAG_TO_SET O_NDELAY
#else /* BSD */
#define FLAG_TO_SET FNDELAY
#endif
#endif
rc = fcntl(sigpipe[1], F_GETFL);
if (rc != -1)
rc = fcntl(sigpipe[1], F_SETFL, rc | FLAG_TO_SET);
if (rc < 0) return rc;
return 0;
#undef FLAG_TO_SET
}
/* generic handler for signals, writes signal number to pipe */
void sigpipe_handler(int signum)
{
write(sigpipe[1], &signum, sizeof(signum));
signal(signum, sigpipe_handler);
}
/* assign a signal number to the pipe */
void sigpipe_assign(int signum)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigpipe_handler;
sigaction(signum, &sa, NULL);
}
/* return the signal pipe read file descriptor for select(2) */
int sigpipe_fd(void)
{
return sigpipe[0];
}
/* read and return the pending signal from the pipe */
int sigpipe_read(void)
{
int signum;
read(sigpipe[0], &signum, sizeof(signum));
return signum;
}
void sigpipe_close(void)
{
close(sigpipe[0]);
close(sigpipe[1]);
}
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