syslog.c File Reference

#include <stdio.h>
#include <string.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include "syslog.h"

Include dependency graph for syslog.c:

Go to the source code of this file.

Macros
#define	SYSLOG_DGRAM_SIZE   1024

Functions
const char *	set_syslog_conf_dir (const char *dir)
static void	init_logger_addr ()
void	closelog ()
void	openlog (char *ident, int option, int facility)
int	setlogmask (int mask)
void	syslog (int pri, char *fmt,...)
void	vsyslog (int pri, char *fmt, va_list ap)

Variables
static const char *	syslog_conf_dir = "."
static BOOL	initialized = FALSE
static int	log_mask = 0xFF
static char *	syslog_ident
static int	syslog_facility
static char	str_pid [40]
static SOCKADDR_IN	sa_logger
static SOCKET	sock
static char	local_hostname [MAX_COMPUTERNAME_LENGTH+1]
static char	datagramm [SYSLOG_DGRAM_SIZE]
static int	datagramm_size

Macro Definition Documentation

SYSLOG_DGRAM_SIZE

#define SYSLOG_DGRAM_SIZE   1024

Definition at line 36 of file syslog.c.

Function Documentation

closelog()

void closelog

(

void

)

Definition at line 153 of file syslog.c.

{
    if( !initialized )
        return;
    closesocket( sock );
    WSACleanup();
    initialized = FALSE;
}

Referenced by openlog().

init_logger_addr()

static void init_logger_addr ( )

static

Definition at line 70 of file syslog.c.

{
    char pathname[ FILENAME_MAX ];
    char *p;
    FILE *fd;
    char host[256];
    struct hostent * phe;
 
    memset( &sa_logger, 0, sizeof(SOCKADDR_IN) );
    sa_logger.sin_family = AF_INET;
 
    if( '\\' == syslog_conf_dir[0] || '/' == syslog_conf_dir[0] || ':' == syslog_conf_dir[1] )
    {
        /* absolute path */
        strcpy( pathname, syslog_conf_dir );
    }
    else
    {
        /* relative path */
        char *q;
 
        strcpy( pathname, __argv[0] );
        p = strrchr( pathname, '\\' ) + 1;
        q = strrchr( pathname, '/' ) + 1;
        if( p < q )
            *q = 0;
        else if( p > q )
            *p = 0;
        else
            pathname[0] = 0;
        strcat( pathname, syslog_conf_dir );
    }
    p = &pathname[ strlen( pathname ) - 1 ];
    if( '\\' != *p && '/' != *p )
    {
        p++; *p = '/';
    }
    strcpy( ++p, "syslog.host" );
 
    /* read destination host name */
    fd = fopen( pathname, "r" );
    if( !fd )
        goto use_default;
 
    if( NULL == fgets( host, sizeof(host), fd ) )
        host[0] = 0;
    else
    {
        p = strchr( host, '\n' );
        if( p )
            *p = 0;
        p = strchr( host, '\r' );
        if( p )
            *p = 0;
    }
    fclose( fd );
 
    p = strchr( host, ':' );
    if( p )
        *p++ = 0;
 
    phe = gethostbyname( host );
    if( !phe )
        goto use_default;
 
    memcpy( &sa_logger.sin_addr.s_addr, phe->h_addr, phe->h_length );
 
    if( p )
        sa_logger.sin_port = htons( (unsigned short) strtoul( p, NULL, 0 ) );
    else
        sa_logger.sin_port = htons( SYSLOG_PORT );
    return;
 
use_default:
    sa_logger.sin_addr.S_un.S_addr = htonl( 0x7F000001 );
    sa_logger.sin_port = htons( SYSLOG_PORT );
}

Referenced by openlog().

openlog()

void openlog	(	char *	ident,
		int	option,
		int	facility
	)

Definition at line 167 of file syslog.c.

{
    BOOL failed = TRUE, wsa_initialized = FALSE;
    WSADATA wsd;
    SOCKADDR_IN sa_local;
    DWORD n;
    int size;
 
    if( initialized )
        return;
 
    syslog_facility = facility? facility : LOG_USER;
 
    /* FIXME: should we reset logmask? */
 
    if( option & LOG_PID )
        snprintf( str_pid, sizeof(str_pid), "[%lu]", GetCurrentProcessId() );
    else
        str_pid[0] = 0;
 
    /* FIXME: handle other options */
 
    n = sizeof(local_hostname);
    if( !GetComputerName( local_hostname, &n ) )
        goto done;
 
    sock = INVALID_SOCKET;
    if( WSAStartup( MAKEWORD( 2, 2 ), &wsd ) )
        goto done;
    wsa_initialized = TRUE;
 
    init_logger_addr();
 
    for( n = 0;; n++ )
    {
        sock = socket( AF_INET, SOCK_DGRAM, 0 );
        if( INVALID_SOCKET == sock )
            goto done;
 
        memset( &sa_local, 0, sizeof(SOCKADDR_IN) );
        sa_local.sin_family = AF_INET;
        if( bind( sock, (SOCKADDR*) &sa_local, sizeof(SOCKADDR_IN) ) == 0 )
            break;
        closesocket( sock );
        sock = INVALID_SOCKET;
        if( n == 100 )
            goto done;
        Sleep(0);
    }
 
    /* get size of datagramm */
    size = sizeof(datagramm_size);
    if( getsockopt( sock, SOL_SOCKET, SO_MAX_MSG_SIZE, (char*) &datagramm_size, &size ) )
        goto done;
    if( datagramm_size - strlen(local_hostname) - (ident? strlen(ident) : 0) < 64 )
        goto done;
    if( datagramm_size > sizeof(datagramm) )
        datagramm_size = sizeof(datagramm);
 
    if( atexit( closelog ) )
        goto done;
 
    syslog_ident = ident;
    syslog_facility = facility;
    failed = FALSE;
 
done:
    if( failed )
    {
        if( sock != INVALID_SOCKET ) closesocket( sock );
        if( wsa_initialized ) WSACleanup();
    }
    initialized = !failed;
}

Referenced by vsyslog().

set_syslog_conf_dir()

const char * set_syslog_conf_dir

(

const char *

dir

)

Definition at line 55 of file syslog.c.

{
    const char *ret = syslog_conf_dir;
    syslog_conf_dir = dir;
    return ret;
}

setlogmask()

int setlogmask

(

int

mask

)

Definition at line 247 of file syslog.c.

{
    int ret = log_mask;
 
    if( mask )
        log_mask = mask;
    return ret;
}

syslog()

void syslog	(	int	pri,
		char *	fmt,
			...
	)

Definition at line 261 of file syslog.c.

{
    va_list ap;
 
    va_start( ap, fmt );
    vsyslog( pri, fmt, ap );
    va_end( ap );
}

vsyslog()

void vsyslog	(	int	pri,
		char *	fmt,
		va_list	ap
	)

Definition at line 275 of file syslog.c.

{
    static char *month[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                            "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
    SYSTEMTIME stm;
    int len;
    char *p;
 
    if( !(LOG_MASK( LOG_PRI( pri )) & log_mask) )
        return;
 
    openlog( NULL, 0, pri & LOG_FACMASK );
    if( !initialized )
        return;
 
    if( !(pri & LOG_FACMASK) )
        pri |= syslog_facility;
 
    GetLocalTime( &stm );
    len = sprintf( datagramm, "<%d>%s %2d %02d:%02d:%02d %s %s%s: ",
                   pri,
                   month[ stm.wMonth - 1 ], stm.wDay, stm.wHour, stm.wMinute, stm.wSecond,
                   local_hostname, syslog_ident? syslog_ident : "", str_pid );
    vsnprintf( datagramm + len, datagramm_size - len, fmt, ap );
    p = strchr( datagramm, '\n' );
    if( p )
        *p = 0;
    p = strchr( datagramm, '\r' );
    if( p )
        *p = 0;
 
    sendto( sock, datagramm, strlen(datagramm), 0, (SOCKADDR*) &sa_logger, sizeof(SOCKADDR_IN) );
}

Referenced by syslog().

Variable Documentation

datagramm

char datagramm[SYSLOG_DGRAM_SIZE]

static

Definition at line 47 of file syslog.c.

Referenced by openlog(), and vsyslog().

datagramm_size

int datagramm_size

static

Definition at line 48 of file syslog.c.

Referenced by openlog(), and vsyslog().

initialized

BOOL initialized = FALSE

static

Definition at line 39 of file syslog.c.

Referenced by __acrt_initialize_multibyte(), _RTC_InitBase(), closelog(), FD31_Init(), gl_init_math(), IDirectSound8_test(), IDirectSound_test(), IDirectSoundCapture_test(), IDirectSoundFullDuplex_test(), msvcrt_mlock_set_entry_initialized(), openlog(), test_external(), and vsyslog().

local_hostname

char local_hostname[MAX_COMPUTERNAME_LENGTH+1]

static

Definition at line 46 of file syslog.c.

Referenced by openlog(), and vsyslog().

log_mask

int log_mask = 0xFF

static

Definition at line 40 of file syslog.c.

Referenced by setlogmask(), and vsyslog().

sa_logger

SOCKADDR_IN sa_logger

static

Definition at line 44 of file syslog.c.

Referenced by init_logger_addr(), and vsyslog().

sock

SOCKET sock

static

Definition at line 45 of file syslog.c.

str_pid

char str_pid[40]

static

Definition at line 43 of file syslog.c.

Referenced by openlog(), and vsyslog().

syslog_conf_dir

const char* syslog_conf_dir = "."

static

Definition at line 22 of file syslog.c.

Referenced by init_logger_addr(), and set_syslog_conf_dir().

syslog_facility

int syslog_facility

static

Definition at line 42 of file syslog.c.

Referenced by openlog(), and vsyslog().

syslog_ident

char* syslog_ident

static

Definition at line 41 of file syslog.c.

Referenced by openlog(), and vsyslog().