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/*
* Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/** @file
*
* Syslog protocol
*
*/
#include <stdint.h>
#include <byteswap.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>
#include <ipxe/tcpip.h>
#include <ipxe/dhcp.h>
#include <ipxe/settings.h>
#include <ipxe/console.h>
#include <ipxe/ansiesc.h>
#include <ipxe/syslog.h>
/** The syslog server */
static struct sockaddr_tcpip logserver = {
.st_port = htons ( SYSLOG_PORT ),
};
/** Syslog UDP interface operations */
static struct interface_operation syslogger_operations[] = {};
/** Syslog UDP interface descriptor */
static struct interface_descriptor syslogger_desc =
INTF_DESC_PURE ( syslogger_operations );
/** The syslog UDP interface */
static struct interface syslogger = INTF_INIT ( syslogger_desc );
/******************************************************************************
*
* Console driver
*
******************************************************************************
*/
/** Syslog line buffer */
static char syslog_buffer[SYSLOG_BUFSIZE];
/** Index into syslog line buffer */
static unsigned int syslog_idx;
/** Syslog recursion marker */
static int syslog_entered;
/** Syslog ANSI escape sequence handlers */
static struct ansiesc_handler syslog_ansiesc_handlers[] = {
{ 0, NULL }
};
/** Syslog ANSI escape sequence context */
static struct ansiesc_context syslog_ansiesc_ctx = {
.handlers = syslog_ansiesc_handlers,
};
/**
* Print a character to syslog console
*
* @v character Character to be printed
*/
static void syslog_putchar ( int character ) {
int rc;
/* Do nothing if we have no log server */
if ( ! logserver.st_family )
return;
/* Ignore if we are already mid-logging */
if ( syslog_entered )
return;
/* Strip ANSI escape sequences */
character = ansiesc_process ( &syslog_ansiesc_ctx, character );
if ( character < 0 )
return;
/* Ignore carriage return */
if ( character == '\r' )
return;
/* Treat newline as a terminator */
if ( character == '\n' )
character = 0;
/* Add character to buffer */
syslog_buffer[syslog_idx++] = character;
/* Do nothing more unless we reach end-of-line (or end-of-buffer) */
if ( ( character != 0 ) &&
( syslog_idx < ( sizeof ( syslog_buffer ) - 1 /* NUL */ ) ) ) {
return;
}
/* Reset to start of buffer */
syslog_idx = 0;
/* Guard against re-entry */
syslog_entered = 1;
/* Send log message */
if ( ( rc = xfer_printf ( &syslogger, "<%d>ipxe: %s",
SYSLOG_PRIORITY ( SYSLOG_FACILITY,
SYSLOG_SEVERITY ),
syslog_buffer ) ) != 0 ) {
DBG ( "SYSLOG could not send log message: %s\n",
strerror ( rc ) );
}
/* Clear re-entry flag */
syslog_entered = 0;
}
/** Syslog console driver */
struct console_driver syslog_console __console_driver = {
.putchar = syslog_putchar,
};
/******************************************************************************
*
* Settings
*
******************************************************************************
*/
/** Syslog server setting */
struct setting syslog_setting __setting ( SETTING_MISC ) = {
.name = "syslog",
.description = "Syslog server",
.tag = DHCP_LOG_SERVERS,
.type = &setting_type_ipv4,
};
/**
* Apply syslog settings
*
* @ret rc Return status code
*/
static int apply_syslog_settings ( void ) {
struct sockaddr_in *sin_logserver =
( struct sockaddr_in * ) &logserver;
struct in_addr old_addr;
int len;
int rc;
/* Fetch log server */
old_addr.s_addr = sin_logserver->sin_addr.s_addr;
logserver.st_family = 0;
if ( ( len = fetch_ipv4_setting ( NULL, &syslog_setting,
&sin_logserver->sin_addr ) ) >= 0 ) {
sin_logserver->sin_family = AF_INET;
}
/* Do nothing unless log server has changed */
if ( sin_logserver->sin_addr.s_addr == old_addr.s_addr )
return 0;
/* Reset syslog connection */
intf_restart ( &syslogger, 0 );
/* Do nothing unless we have a log server */
if ( ! logserver.st_family ) {
DBG ( "SYSLOG has no log server\n" );
return 0;
}
/* Connect to log server */
if ( ( rc = xfer_open_socket ( &syslogger, SOCK_DGRAM,
( ( struct sockaddr * ) &logserver ),
NULL ) ) != 0 ) {
DBG ( "SYSLOG cannot connect to log server: %s\n",
strerror ( rc ) );
return rc;
}
DBG ( "SYSLOG using log server %s\n",
inet_ntoa ( sin_logserver->sin_addr ) );
return 0;
}
/** Syslog settings applicator */
struct settings_applicator syslog_applicator __settings_applicator = {
.apply = apply_syslog_settings,
};
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