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/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008,2009 Herbert Haas
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* 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, see http://www.gnu.org/licenses/gpl-2.0.html
*
*/
#include "mz.h"
#include "cli.h"
#define MZ_SYSLOG_HELP \
"| Syslog type: Send (traditional) Syslog packets via UDP.\n" \
"|\n" \
"| Parameters:\n" \
"|\n" \
"| severity, sev 0-7 .... Severity level from Emergency (0) to Debug (7)\n" \
"| facility, fac 0-23 .... Facility number\n" \
"|\n" \
"| time hh:mm:ss .... Local time, 24-hour format\n" \
"| month, mon Mmm .... Current month, 1-12\n" \
"| day dd .... Current day, 0-31\n" \
"|\n" \
"| host max 314 bytes .... Name or IP Address of sending host\n" \
"|\n" \
"| Defaults:\n" \
"|\n" \
"| Per default the severity \"Warning\" (4), the facility \"Security\" (4), and the\n" \
"| current time stamp is used. If no host is given, host is set to \"MZ\"\n" \
"|\n" \
"| You can define the Syslog message itself using the -P flag. For example:\n" \
"|\n" \
"| mz eth0 -t syslog sev=3 -P \"You have been mausezahned.\"\n" \
"|\n" \
"| By the way, mz (by intention) does not check if your timestamp is valid according\n" \
"| calendar rules. It is generally recommended to follow the Darwin Era Calendar ;-)\n" \
"|\n"
// RFC 3164 states that a Syslog message consists of three parts: PRI, HEADER, and MSG.
//
// 1) PRI: contains facility(f) and severity(s), using the syntax "<N>" where N = f * 8 + s
//
// 2) HEADER: contains a timestamp and a sender-ID (name or IP), for example "May 25 23:42:42 Mausezahnhost"
// Note that instead of leading zeroes a space must be used for the day e. g. "May 5".
// However leading zeroes are required for hour, minutes, seconds, e. g. "01:05:09"
//
// 3) MSG: consists of TAG and CONTENT field. The TAG identifies the program or process and
// must not exceed 32 characters. Typically the TAG and the CONTENT fields are delimited
// via either a "[", or a colon (:) or a space. The CONTENT field is a simple text.
//
// EXAMPLE from RFC 3164:
//
// <34>Oct 11 22:14:15 mymachine su: 'su root' failed for lonvick on /dev/pts/8
//
// EXAMPLE from Cisco Router:
//
// *Mar 23 13:45:08.727: %ENVMON-3-FAN_FAILED: Fan 2 not rotating
//
int create_syslog_packet(void)
{
unsigned int pri, sev, fac, day, curday, mon, curmon;
char lt[8], host[314];
char *Months[12] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
time_t curtime;
struct tm curtime_broken;
char argval[MAX_PAYLOAD_SIZE];
int ca=0, aa;
aa=number_of_args(tx.arg_string);
if ( (getarg(tx.arg_string,"help", NULL)==1) && (mode==SYSLOG) )
{
ca++; // counts each argument
if (mz_port)
{
cli_print(gcli, "%s", MZ_SYSLOG_HELP);
return -1;
}
else
{
fprintf(stderr,"\n"
MAUSEZAHN_VERSION
"\n%s", MZ_SYSLOG_HELP);
exit(0);
}
}
if ( (getarg(tx.arg_string,"severity", argval)==1) ||
(getarg(tx.arg_string,"sev", argval)==1) )
{
ca++; // counts each argument
sev = (unsigned int) str2int(argval);
}
else
{
sev = 4;
}
if ( (getarg(tx.arg_string,"facility", argval)==1) ||
(getarg(tx.arg_string,"fac", argval)==1) )
{
ca++; // counts each argument
fac = (unsigned int) str2int(argval);
}
else
{
fac = 4;
}
time(&curtime);
localtime_r (&curtime, &curtime_broken);
if (getarg(tx.arg_string,"time", argval)==1)
{
ca++; // counts each argument
strncpy(lt,argval,8);
// TODO: check if specified timestamp has valid format, e. g. 15:03:22
}
else
{
timestamp_hms (lt);
}
curmon = curtime_broken.tm_mon; // Note that Jan = 0, ..., Dec = 11 !!!
if ( (getarg(tx.arg_string,"month", argval)==1) ||
(getarg(tx.arg_string,"mon", argval)==1) )
{
ca++; // counts each argument
mon = (unsigned int) str2int(argval);
if ( (mon<1) || (mon>12) )
{
fprintf(stderr, " mz/syslog: Invalid month; will use current month (%i)!\n", curmon+1);
mon = curmon;
}
}
else
{
mon = curmon;
}
curday = curtime_broken.tm_mday;
if (getarg(tx.arg_string,"day", argval)==1)
{
ca++; // counts each argument
day = (unsigned int) str2int(argval);
if ( (day<1) || (day>31) )
{
fprintf(stderr, " mz/syslog: Invalid day; will use current day(%i)!\n", curday);
day = curday;
}
}
else
{
day = curday;
}
if (getarg(tx.arg_string,"host", argval)==1)
{
ca++; // counts each argument
strncpy(host,argval,314); // 314 is just an arbitrary number ;-)
}
else
{
strcpy(host, "MZ42");
}
// CHECK SURPLUS ARGUMENTS
if (aa!=ca) {
fprintf(stderr, "WARNING: %i unmatched arguments within argument string!\n", aa-ca);
}
// Now put everything together:
//
// Again the EXAMPLE from RFC 3164:
//
// <34>Oct 11 22:14:15 mymachine su: 'su root' failed for lonvick on /dev/pts/8
//
pri = 8*fac+sev;
sprintf((char*) tx.udp_payload, "<%d>%s %2i %s %s ",
pri,
Months[mon],
day,
lt,
host);
if (tx.ascii) // ASCII PAYLOAD overrides hex payload
{
strncat((char *)tx.udp_payload, (char *)tx.ascii_payload, 2048);
tx.ascii=0; // avoid that 'create_udp_packet' overwrites this!
}
else
{
strcat((char *)tx.udp_payload, "%MZSYS-42-CRN: Main reactor exceeded critical temperature!");
}
tx.udp_payload_s = strlen((char *)tx.udp_payload);
tx.dp = 514;
tx.sp = 514;
tx.udp_len = 8 + tx.udp_payload_s;
if (verbose)
{
fprintf(stderr, "Syslog: %s\n", tx.udp_payload);
}
return 0;
}
|
