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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* debug_syslog.c
*
* Fri Dec 7 14:24:54 CET 2012
* Copyright 2012 Jonas Suhr Christensen
* jsc@umbraculum.org
****************************************************************************/
/*
* This file is part of Debug Module.
*
* Debug Module 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
* (at your option) any later version.
*
* Debug Module 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 Debug Module; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "debug_syslog.h"
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#include <errno.h>
#include "debug_util.h"
#ifndef WITH_DBG_SYSLOG
#warning debug_syslog.c compiled but WITH_DBG_SYSLOG not defined
#endif
#define SYSLOG_MSGLEN 1024
#define SYSLOG_PRILEN 5
#define SYSLOG_TIMELEN 32
#define SYSLOG_TAGLEN 32
#define SYSLOG_CONTENTLEN SYSLOG_MSGLEN - SYSLOG_PRILEN - SYSLOG_TIMELEN - SYSLOG_TAGLEN
//#define SYSLOG_CONTENTLEN SYSLOG_MSGLEN - SYSLOG_PRILEN - SYSLOG_TAGLEN - SYSLOG_HEADERLEN -1
#define SYSLOG_LENOFEXECNAME 256
static int dbg_syslog_sock;
static struct sockaddr_in dbg_syslog_sockaddr;
static pid_t pid;
static char execname[SYSLOG_LENOFEXECNAME];
void dbg_syslog_init(const char* host, int port)
{
printf("Initializing syslog module remote %s:%d\n", host, port);
if ( (dbg_syslog_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
fprintf(stderr, "Failed to create socket\n");
return;
}
memset(&dbg_syslog_sockaddr, 0, sizeof(dbg_syslog_sockaddr));
dbg_syslog_sockaddr.sin_family = AF_INET;
dbg_syslog_sockaddr.sin_addr.s_addr = inet_addr(host);
dbg_syslog_sockaddr.sin_port = htons(port);
// This implementation has all kind of possible errors:
// * It is Linux only
// * Max length of execname (including path, avoid this by cmdline file in reverse order)
// is set to SYSLOG_LENOFEXECNAME
// * If not found execname is ""
pid = getpid();
char buf[SYSLOG_LENOFEXECNAME];
FILE* f = fopen("/proc/self/cmdline", "r");
if(f) {
char* s = NULL;
s = fgets(buf, SYSLOG_LENOFEXECNAME, f);
fclose(f);
}
char* bufptr = strrchr(buf, '/');
if(bufptr) {
strncpy(execname, bufptr+1, SYSLOG_LENOFEXECNAME-1);
}
else {
strcpy(execname, "\0");
}
printf("\tRunning as %s with pid %d\n", execname, pid);
}
/*
void dbg_syslog_createheader() {
const time_t rawtime = time(NULL);
struct tm time;
localtime_r(&rawtime, &time);
char timebuf[256];
strftime(timebuf, 256, "%b %e %H:%M:%S ", &time);
char bufpri[SYSLOG_PRILEN] = "<20>";
char buftag[SYSLOG_TAGLEN] = "PROGRAM[PID]: ";
}
*/
/*
* Syslog message specification (based on rfc3164).
* Modified after reading syslog v2. documentation
*
* MSG: "<%d%d>%s %s %s%c%s", FACILITY, SEVERITY, TIME, CLIENT, TAG, DELIM, CONTENT
*
* Example:
* <34>Oct 11 22:14:15 mymachine su: 'su root' failed for lonvick on /dev/pts/8
*
*
* NOTE! Length of MSG must not exceed 1024 characters!
*
* FACILITY:
* 0 kernel messages
* 1 user-level messages
* 2 mail system
* 3 system daemons
* 4 security/authorization messages (note 1)
* 5 messages generated internally by syslogd
* 6 line printer subsystem
* 7 network news subsystem
* 8 UUCP subsystem
* 9 clock daemon (note 2)
* 10 security/authorization messages (note 1)
* 11 FTP daemon
* 12 NTP subsystem
* 13 log audit (note 1)
* 14 log alert (note 1)
* 15 clock daemon (note 2)
* 16 local use 0 (local0)
* 17 local use 1 (local1)
* 18 local use 2 (local2)
* 19 local use 3 (local3)
* 20 local use 4 (local4)
* 21 local use 5 (local5)
* 22 local use 6 (local6)
* 23 local use 7 (local7)
*
* SEVERITY:
* 0 Emergency: system is unusable
* 1 Alert: action must be taken immediately
* 2 Critical: critical conditions
* 3 Error: error conditions
* 4 Warning: warning conditions
* 5 Notice: normal but significant condition
* 6 Informational: informational messages
* 7 Debug: debug-level messages
*
* TIME:
* Time of message formatted like: Mmm dd hh:mm:ss
*
* CLIENT:
* Hostname or
* IPv4 address or
* IPv6 address
*
* TAG: format: PROGRAM[PID]
* Program or process information
* PROGRAM is Alphanumeric
* PID is numeric
* Must not exceed 32 characters
*
* DELIM:
* A nonn-alphanumeric character (eg. ':', '[' ...)
* In implementation DELIM is the first character of CONTENT
*
* CONTENT:
* The message to log.
* String of printable characters
*
* */
void dbg_syslog_output(char* msg)
{
if(dbg_syslog_sock < 0) return;
const time_t rawtime = time(NULL);
struct tm time;
dbg_localtime(&rawtime, &time);
char buftime[SYSLOG_TIMELEN];
strftime(buftime, SYSLOG_TIMELEN, "%b %e %H:%M:%S ", &time);
// Currently everything is mapped to local facility 4 as debug
char bufpri[SYSLOG_PRILEN];
strncpy(bufpri, "<167>", SYSLOG_PRILEN);
char buftag[SYSLOG_TAGLEN];
snprintf(buftag, SYSLOG_TAGLEN, "%s[%d]: ", execname, pid);
char buf[SYSLOG_MSGLEN];
memset(buf, 0, sizeof(buf));
strncat(buf, bufpri, SYSLOG_PRILEN);
strncat(buf, buftime, SYSLOG_TIMELEN);
strncat(buf, buftag, SYSLOG_TAGLEN);
strncat(buf, msg, SYSLOG_CONTENTLEN);
strcat(buf, "\n");
// printf("Sending to syslog: %s\n", buf);
int buf_len = strlen(buf);
if((sendto(dbg_syslog_sock, buf, buf_len, 0, (struct sockaddr *) &dbg_syslog_sockaddr,
sizeof(dbg_syslog_sockaddr))) != buf_len) {
fprintf(stderr, "Failed to send message successfully: %s\n", strerror(errno));
}
}
void dbg_syslog_close() {
printf("Closing syslog module\n");
if(dbg_syslog_sock < 0) return;
close(dbg_syslog_sock);
}
#ifdef TEST_DEBUG_SYSLOG
//Additional dependency files
//deps:
//Required cflags (autoconf vars may be used)
//cflags:
//Required link options (autoconf vars may be used)
//libs:
#include "test.h"
TEST_BEGIN;
// TODO: Put some testcode here (see test.h for usable macros).
TEST_TRUE(false, "No tests yet!");
TEST_END;
#endif/*TEST_DEBUG_SYSLOG*/
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