/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008-2010 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
*
*/
#ifndef __MAUSEZAHN__
#define __MAUSEZAHN__
#define _GNU_SOURCE
#include <libnet.h>
#include <pcap/pcap.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <stdarg.h>
#include <math.h>
extern int verbose_level;
static inline void verbose_l1(const char *format, ...)
{
va_list vl;
if (verbose_level < 1)
return;
va_start(vl, format);
vfprintf(stderr, format, vl);
va_end(vl);
}
static inline void verbose_l2(const char *format, ...)
{
va_list vl;
if (verbose_level < 2)
return;
va_start(vl, format);
vfprintf(stderr, format, vl);
va_end(vl);
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//
#define MAUSEZAHN_VERSION "Mausezahn 0.40 - (C) 2007-2010 by Herbert Haas - http://www.perihel.at/sec/mz/"
#define MAUSEZAHN_VERSION_SHORT "0.40"
//
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////
// "Dies ist ein schrecklicher Ort."
#define MZ_DEFAULT_CONFIG_PATH "/etc/mausezahn/" // see also mz_default_config_path below
#define MZ_DEFAULT_LOG_PATH "/var/log/mausezahn/" // see also mz_default_log_path below
#define SLEEP usleep // The sleep function to use. Consider 'nanosleep' in future.
#define DEFAULT_DELAY 0
#define PCAP_READ_TIMEOUT_MSEC 1 // The read timeout for pcap_open_live()
#define MZ_MAX_DEVICES 10 // Max number of network devices supported
#define MAX_PAYLOAD_SIZE 3*8192
#define MAX_DNS_NAME 256
#define MAX_8021Q_TAGS 16
#define TIME_COUNT_MAX 10000 // the size of the timestamp arrays timeRX and timeTX upon creation
#define TIME_COUNT 100 // the default used-size of the timestamp arrays timeRX and timeTX
#define MAX_DATA_BLOCKS 1000 // how many data blocks of size TIME_COUNT-1 should be written per file
#define MAXBYTES_TO_READ 1500 // how many bytes the pcap routine should read from net
#define RCV_RTP_MAX_BAR_WIDTH 500 // max line-width printed in BAR mode (see rcv_rtp.c)
#define ETH_SRC 1 // These are only some symbols used by some functions. (Don't touch)
#define ETH_DST 2 // These are only some symbols used by some functions.
#define SRC_PORT 1 // These are only some symbols used by some functions.
#define DST_PORT 2 // These are only some symbols used by some functions.
#define TEST fprintf(stderr, "HERE at line %i in file %s\n", __LINE__,__FILE__ ); fflush(stderr);
// ----- PCAP-specific definitions: ---------------------
#define IPADDRSIZE 46
int MZ_SIZE_LONG_INT;
char mz_default_config_path[256];
char mz_default_log_path[256];
struct arp_table_struct {
int index; // an entry index (1, 2, ...) for easier user access
u_int8_t sa[6]; // sent by this MAC SA
u_int8_t smac[6]; // announced MAC
u_int8_t smac_prev[6]; // previously announced MAC
u_int8_t sip[4]; // announced IP
unsigned long int uni_rq; // count unidirectional ARP requests for this IP
unsigned long int bc_resp; // count broadcast ARP responses for this IP
unsigned long int uni_resp; // count normal (unidir) ARP responses for this IP
unsigned long int changed; // count how often the MAC address has changed!
int locked; // 1=this entry cannot be overidden anymore
int dynamic; // 1=learned dynamically, 0=configured by user
int flags; // anomaly information (length anomaly: bit 0, sa!=smac: bit 1 , ...)
int gw; // 1=Default GW
char when[10]; // human readable timestamp (e. g. "11:42:53")
u_int32_t sec, nsec; // timestamp of last ARP response
u_int32_t sec_prev, nsec_prev; // timestamp of previous ARP response
//-----------------//
struct arp_table_struct *next;
};
// Device list
struct device_struct
{
char dev[16]; // Device name
int index; // Device index (assigned by OS)
int phy; // 1 if physical, 0 if not (e. g. loopback)
int mtu;
int cli; // if set to 1 then the CLI connection must terminate here
int mgmt_only; // if set to 1 then no data traffic is allowed through that interface
// ---- MAC addresses ----
u_int8_t mac[6]; // Real MAC address
u_int8_t mac_mops[6]; // MAC address to be used
// ---- IP related -----
char ip_str[IPADDRSIZE+1]; // Real IP address as string in dotted decimal notation
u_int8_t ip[4]; // Real IP address
u_int8_t net[4]; // Real network
u_int8_t mask[4]; // Real mask
u_int8_t ip_mops[4]; // IP address to be used
// ---- Default Gateway per interface:
u_int8_t mac_gw[6]; // MAC address of default gateway
u_int8_t ip_gw[4]; // IP address of default gateway
// ---- various device-specific handles ----
pthread_t arprx_thread;
struct pcap *p_arp; // pcap handle
struct arp_table_struct *arp_table; // dedicated ARP table
int ps; // packet socket
} device_list[MZ_MAX_DEVICES];
int device_list_entries;
#pragma pack(1)
struct struct_ethernet
{
u_int8_t eth_da[6];
u_int8_t eth_sa[6];
u_int16_t eth_type;
};
struct struct_arp
{
u_int16_t arp_hrd; // hardware address format
u_int16_t arp_pro; // protocol address format
u_int8_t arp_hln; // hardware address length
u_int8_t arp_pln; // protocol address length
u_int16_t arp_op; // ARP operation type
u_int8_t arp_smac[6]; // sender's hardware address
u_int8_t arp_sip[4]; // sender's protocol address
u_int8_t arp_tmac[6]; // target hardware address
u_int8_t arp_tip[4]; // target protocol address
};
//#pragma pack(1)
struct struct_ip
{
u_int8_t
hlen :4,
ver :4;
u_int8_t
tos;
u_int16_t
len;
u_int16_t
id,
offset; // flags and fragment offset field
u_int8_t
ttl,
proto;
u_int16_t
sum;
u_int8_t src[4];
u_int8_t dst[4];
};
//#pragma pack(1)
struct struct_udp {
u_int16_t
sp,
dp,
len,
sum;
};
//#pragma pack(1)
struct struct_rtp {
u_int8_t
byte1,
ptype;
u_int16_t
sqnr;
u_int32_t
timestamp, // official timestamp, created by codecs
ssrc;
// csrc, // only used by mixers
u_int16_t
ext_id,
ext_len;
u_int32_t
time_sec,
time_nsec,
time_sec2,
time_nsec2;
};
// ---------End of PCAP-specific definitions---------------
// ************************************
//
// Global variables
//
// ************************************
enum operating_modes
{
BYTE_STREAM,
ARP,
BPDU,
IP,
ICMP,
ICMP6,
UDP,
TCP,
DNS,
CDP,
RTP,
RX_RTP,
SYSLOG,
LLDP
} mode;
int ipv6_mode;
int quiet; // don't even print 'important standard short messages'
int verbose; // report character
int simulate; // if 1 then don't really send frames
char path[256];
char filename[256];
FILE *fp, *fp2; // global multipurpose file pointer
long double total_d;
clock_t mz_start, mz_stop;
enum rtp_display_mode {
BAR, NCURSES, TEXT
} rtp_dm;
int mz_rand;
int bwidth;
struct mz_timestamp {
u_int32_t sec;
u_int32_t nsec;
};
struct mz_timestamp
tv,
timeTX[TIME_COUNT_MAX],
timeRX[TIME_COUNT_MAX];
int32_t
time0,
jitter_rfc,
jitter[TIME_COUNT_MAX];
int
rtp_log,
time0_flag, // If set then time0 has valid data
sqnr0_flag;
u_int8_t
mz_ssrc[4]; // holds RTP stream identifier for rcv_rtp()
u_int16_t
sqnr_cur,
sqnr_last,
sqnr_next;
u_int32_t
drop, // packet drop count
dis, // packet disorder count
gind, // a global index to run through deltaRX, deltaTX, and jitter
gind_max, // the amount of entries used in the (ugly oversized) arrays; per default set to TIME_COUNT
gtotal; // counts number of file write cycles (see "got_rtp_packet()")
char rtp_filter_str[64];
struct tx_struct
{
// Management issues for TX
char device[16]; // every packet could be sent through a different device
int packet_mode; // 0 means use LIBNET_LINK_ADV, 1 means LIBNET_RAW4
unsigned int count; // 0 means infinite, 1 is default
unsigned int delay; // Delay in microseconds, 0 means no delay (default)
char arg_string[MAX_PAYLOAD_SIZE]; // Argument-string when -t is used
// Ethernet and 802.3 parameters
int eth_params_already_set; // if set to 1 then send_eth should only send the frame
u_int8_t eth_mac_own[6]; // Contains own interface MAC if needed by some modules
char eth_dst_txt[32]; // Text version of eth_dst (or keyword such as 'rand')
u_int8_t eth_dst[6];
int eth_dst_rand; // 1 if random
char eth_src_txt[32]; // Text version of eth_src (or keyword such as 'rand')
u_int8_t eth_src[6];
int eth_src_rand; // 1 if random
u_int16_t eth_type;
u_int16_t eth_len;
u_int8_t eth_payload[MAX_PAYLOAD_SIZE];
u_int32_t eth_payload_s;
unsigned int padding;
// CDP parameters
u_int8_t
cdp_version,
cdp_ttl,
cdp_payload[MAX_PAYLOAD_SIZE],
cdp_tlv_id[2048]; // The ID is the only required TLV
u_int16_t
cdp_sum;
u_int32_t
cdp_tlv_id_len,
cdp_payload_s;
// 802.1Q VLAN Tag
int dot1Q; // 1 if specified
char dot1Q_txt[32]; // contains 802.1p(CoS) and VLAN-ID ("5:130" or only VLAN "130")
u_int8_t dot1Q_CoS;
u_int16_t dot1Q_vlan;
u_int8_t dot1Q_header[256]; // Contains the complete 802.1Q/P headers (but NOT the Ethernet header!)
u_int8_t dot1Q_header_s;
int dot1Q_at_least_two_headers; // If '1' then we have at least QinQ (or more VLAN tags)
// ASCII PAYLOAD
int ascii; // 1 if specified
u_int8_t ascii_payload[MAX_PAYLOAD_SIZE];
// HEX PAYLOAD
u_int8_t hex_payload[MAX_PAYLOAD_SIZE];
u_int32_t hex_payload_s; // >0 if hex payload is specified
// MPLS Parameters
char mpls_txt[128]; // contains MPLS parameters (label, exp, S, TTL)
char mpls_verbose_string[1024]; // contains all labels for print_frame_details()
int mpls; // 1 if specified
u_int32_t mpls_label;
u_int8_t mpls_exp;
u_int8_t mpls_bos;
u_int8_t mpls_ttl;
// IP parameters
u_int32_t ip_src; // has always network byte order(!)
struct libnet_in6_addr ip6_src;
char ip_src_txt[256];
int ip_src_rand; // if set to 1 then SA should be random
u_int32_t ip_src_h; // mirror of ip_src (NOT network byte order => easy to count)
u_int32_t ip_src_start; // start of range (NOT network byte order => easy to count)
u_int32_t ip_src_stop; // stop of range (NOT network byte order => easy to count)
int ip_src_isrange; // if set to 1 then the start/stop values above are valid.
u_int32_t ip_dst; // has always network byte order(!)
struct libnet_in6_addr ip6_dst;
char ip_dst_txt[256];
u_int32_t ip_dst_h; // mirror of ip_dst (NOT network byte order => easy to count)
u_int32_t ip_dst_start; // start of range (NOT network byte order => easy to count)
u_int32_t ip_dst_stop; // stop of range (NOT network byte order => easy to count)
int ip_dst_isrange; // if set to 1 then the start/stop values above are valid.
u_int16_t
ip_len,
ip_id,
ip_frag, // Flags and Offset !!!
ip_sum;
u_int8_t
ip_tos,
ip_ttl,
ip6_rtype,
ip6_segs,
ip_proto;
u_int8_t
ip_option[1024],
ip_payload[MAX_PAYLOAD_SIZE];
u_int32_t
ip_flow,
ip6_id,
ip_option_s,
ip_payload_s;
// ICMP
char
icmp_verbose_txt[256]; // used for verbose messages in send.c
u_int8_t
icmp_type,
icmp_code;
u_int16_t icmp_ident; // ATTENTION: libnet.h already #defines 'icmp_id', 'icmp_sum', and 'icmp_num'
u_int16_t icmp_chksum; // therefore I needed a renaming here -- be careful in future...
u_int16_t icmp_sqnr; //
u_int32_t
icmp_gateway,
icmp_payload_s;
u_int8_t
icmp_payload[MAX_PAYLOAD_SIZE];
// General L4 parameters:
char *layer4;
u_int16_t
sp, dp,
sp_start, sp_stop,
dp_start, dp_stop;
int
sp_isrange, // if set to 1 then start/stop values above are valid
dp_isrange; // if set to 1 then start/stop values above are valid
// UDP parameters
u_int16_t
udp_len, // includes header size (8 bytes)
udp_sum;
u_int8_t
udp_payload[MAX_PAYLOAD_SIZE];
u_int32_t
udp_payload_s;
// TCP parameters
u_int32_t
tcp_seq,
tcp_seq_start,
tcp_seq_stop, // is always set! Usually seq_start = seq_stop (=no range)
tcp_seq_delta, // Also used instead of an 'isrange' variable
tcp_ack;
u_int8_t
tcp_offset,
tcp_control;
u_int16_t
tcp_win,
tcp_sum,
tcp_urg,
tcp_len; // only needed by libnet and must include header size
u_int8_t
tcp_payload[MAX_PAYLOAD_SIZE];
u_int32_t
tcp_sum_part,
tcp_payload_s;
// RTP parameters
u_int32_t
rtp_sqnr,
rtp_stmp;
} tx; // NOTE: tx elements are considered as default values for MOPS
u_int8_t gbuf[MAX_PAYLOAD_SIZE]; // This is only a generic global buffer to handover data more easily
u_int32_t gbuf_s; //
// ************************************
//
// Prototypes: General Tools
//
// ************************************
void clean_up(int sig);
int getopts(int argc, char *argv[]);
int getarg(char *str, char *arg_name, char *arg_value);
unsigned long int str2int(char *str); // converts "65535" to 65535
unsigned long long int str2lint(char *str); // same but allows 64-bit integers
unsigned long int xstr2int(char *str); // converts "ffff" to 65535
unsigned long long int xstr2lint(char *str); // same but allows 64-bit integers
int mz_strisbinary(char *str);
int mz_strisnum(char *str);
int mz_strishex(char *str);
int str2bin8 (char *str);
long int str2bin16 (char *str);
int char2bits (char c, char *str);
int mz_strcmp(char* usr, char* str, int min);
int mz_tok(char * str, char * delim, int anz, ...);
int delay_parse (struct timespec *t, char *a, char *b);
int reset();
// ************************************
//
// Prototypes: Layer1
//
// ************************************
int send_eth(void);
libnet_ptag_t create_eth_frame (libnet_t *l, libnet_ptag_t t3, libnet_ptag_t t4);
// ************************************
//
// Prototypes: Layer 2
//
// ************************************
int send_arp (void);
int send_bpdu (void);
int send_cdp (void);
// ************************************
//
// Prototypes: Layer 3
//
// ************************************
libnet_t* get_link_context(void);
libnet_ptag_t create_ip_packet (libnet_t *l);
libnet_ptag_t create_ip6_packet (libnet_t *l);
int send_frame (libnet_t *l, libnet_ptag_t t3, libnet_ptag_t t4);
// ************************************
//
// Prototypes: Layer 4
//
// ************************************
libnet_ptag_t create_udp_packet (libnet_t *l);
libnet_ptag_t create_icmp_packet (libnet_t *l);
libnet_ptag_t create_icmp6_packet (libnet_t *l);
libnet_ptag_t create_tcp_packet (libnet_t *l);
// ************************************
//
// Prototypes: Layer 7
//
// ************************************
int create_dns_packet (void);
int create_rtp_packet(void);
int create_syslog_packet(void);
// ************************************
//
// Prototypes: Helper functions for
// byte manipulation,
// address conversion,
// etc
//
// ************************************
// Converts MAC address specified in str into u_int8_t array
// Usage: str2hex_mac ( "00:01:02:aa:ff:ee", src_addr )
int str2hex_mac (char* str, u_int8_t *addr);
// Converts ascii hex values (string) into integer array, similarly as above but for any size.
// Example: "1a 00:00-2f" => {26, 0, 0, 47}
// Note: apply any improvements here and prefer this function in future!
// Return value: Number of converted elements (=length of array)
int str2hex (char* str, u_int8_t *hp, int n);
// Converts ascii numbers (string) into integer array
// Every byte can be specified as integers {0..255}
// For example "192.16.1.1" will be converted to {C0, 10, 01, 01}
int num2hex(char* str, u_int8_t *hp);
// Convert array of integers into string of hex. Useful for verification messages.
// Example: {0,1,10} => "00-01-0A"
// Usage: bs2str ( src_mac, src_mac_txt, 6 )
int bs2str (u_int8_t *bs, char* str, int len);
// Extract contiguous sequence of bytes from an array. First element has index 1 !!!
// Usage: getbytes (bs, da, 1, 6);
int getbytes(u_int8_t *source, u_int8_t *target, int from, int to);
// For any IP address given in 'dotted decimal' returns an unsigned 32-bit integer.
// Example: "192.168.0.1" => 3232235521
// Note: Result is in LITTLE ENDIAN but usually with IP you need BIG ENDIAN, see next.
u_int32_t str2ip32 (char* str);
// For any IP address given in 'dotted decimal' into an unsigned 32-bit integer
// This version does the same as str2ip32() but in BIG ENDIAN.
// Note: With netlib you need this one, not the previous function.
u_int32_t str2ip32_rev (char* str);
// Converts a 2-byte value (e. g. a EtherType field)
// into a nice string using hex notation.
// Useful for verification messages.
// Example: type2str (tx.eth_type, msg) may result in msg="08:00"
// Return value: how many hex digits have been found.
int type2str(u_int16_t type, char *str);
// Parses string 'arg' for an IP range and finds start and stop IP addresses.
// Return value: 0 upon success, 1 upon failure.
//
// NOTE: The results are written in the following variables:
//
// (u_int32_t) tx.ip_dst_start ... contains start value
// (u_int32_t) tx.ip_dst_stop ... contains stop value
// int tx.ip_dst_isrange ... set to 1 if above values valid
//
// The other function does the same for the source address!
//
// Possible range specifications:
//
// 1) 192.168.0.0-192.168.0.12
// 2) 10.2.11.0-10.55.13.2
// 3) 172.18.96.0/19
//
// That is:
//
// FIRST detect a range by scanning for the "-" OR "/" chars
// THEN determine start and stop value and store them as normal unsigned integers
//
int get_ip_range_dst (char *arg);
int get_ip_range_src (char *arg);
// Sets a random SA for a given IP packet.
// Return value: 0 upon success, 1 upon failure
//
int set_rand_SA (libnet_t *l, libnet_ptag_t t3);
// Scans tx.eth_dst_txt or tx.eth_src_txt and sets the corresponding
// MAC addresses (tx.eth_dst or tx.eth_src) accordingly.
// Argument: What string should be checked, ETH_SRC or ETH_DST.
// Return value:
// 0 when a MAC address has been set or
// 1 upon failure.
// Currently eth_src|dst_txt can be:
// 'rand', 'own', 'bc'|'bcast', 'stp', 'pvst',
// or a real mac address.
//
int check_eth_mac_txt(int src_or_dst);
// Scans argument for a port number or range
// and sets the corresponding values in the
// tx struct.
//
// Arguments: sp_or_dp is either SRC_PORT or DST_PORT
// Return value: 0 on success, 1 upon failure
//
int get_port_range (int sp_or_dp, char *arg);
// Return a 4-byte unsigned int random number
u_int32_t mz_rand32 (void);
// Scans argument for TCP flags and sets
// tx.tcp_control accordingly.
//
// Valid keywords are: fin, syn, rst, psh, ack, urg, ecn, cwr
// Valid delimiters are: | or + or -
// Return value: 0 on success, 1 upon failure
//
int get_tcp_flags (char* flags);
// Scans string 'params' for MPLS parameters
// and sets tx.mpls_* accordingly.
//
// CLI Syntax Examples:
//
// -M help .... shows syntax
//
// -M 800 .... label=800
// -M 800:S .... label=800 and BOS flag set
// -M 800:S:64 .... label=800, BOS, TTL=64
// -M 800:64:S .... same
// -M 64:77 .... label=64, TTL=77
// -M 64:800 .... INVALID
// -M 800:64 .... label=800, TTL=64
// -M 800:3:S:64 .... additionall the experimental bits are set (all fields required!)
//
// Note: S = BOS(1), s = NOT-BOS(0)
//
// Valid delimiters: :-.,+
// Return value: 0 on success, 1 upon failure
int get_mpls_params(char *params);
// Parses str for occurence of character or sequence ch.
// Returns number of occurences
int exists(char* str, char* ch);
// Applies another random Ethernet source address to a given Ethernet-PTAG.
// (The calling function should check 'tx.eth_src_rand' whether the SA
// should be randomized.)
int update_Eth_SA(libnet_t *l, libnet_ptag_t t);
// Update timestamp and sequence number in the RTP header.
// The actual RTP message is stored in tx.udp_payload.
int update_RTP(libnet_t *l, libnet_ptag_t t);
// Applies another SOURCE IP address,
// - either a random one (tx.ip_src_rand==1)
// - or from a specified range (tx.ip_src_isrange==1)
// to a given IP-PTAG.
//
// Note: tx.ip_src MUST be already initialized with tx.ip_src_start.
// This is done by 'get_ip_range_src()' in tools.c.
//
// RETURNS '1' if tx.ip_src restarts
int update_IP_SA (libnet_t *l, libnet_ptag_t t);
// Applies another DESTINATION IP address from a specified range (tx.ip_dst_isrange==1)
// to a given IP-PTAG.
//
// Note: tx.ip_dst MUST be already initialized with tx.ip_dst_start.
// This is done by 'get_ip_range_dst()' in tools.c.
//
// RETURN VALUE: '1' if tx.ip_dst restarts
int update_IP_DA(libnet_t *l, libnet_ptag_t t);
// Applies another DESTINATION PORT from a specified range to a given UDP- or TCP-PTAG.
//
// Note: tx.dp MUST be already initialized with tx.dp_start
// This is done by 'get_port_range()' in tools.c.
//
// RETURN VALUE: '1' if tx.dp restarts
int update_DPORT(libnet_t *l, libnet_ptag_t t);
// Applies another SOURCE PORT from a specified range to a given UDP- or TCP-PTAG.
//
// Note: tx.sp MUST be already initialized with tx.sp_start
// This is done by 'get_port_range()' in tools.c.
//
// RETURN VALUE: '1' if tx.sp restarts
int update_SPORT(libnet_t *l, libnet_ptag_t t);
// Applies another TCP SQNR from a specified range to a given TCP-PTAG
//
// RETURN VALUE: '1' if tx.txp_seq restarts
//
int update_TCP_SQNR(libnet_t *l, libnet_ptag_t t);
int update_ISUM(libnet_t *l, libnet_ptag_t t);
int update_USUM(libnet_t *l, libnet_ptag_t t);
int update_TSUM(libnet_t *l, libnet_ptag_t t);
//
//
int print_frame_details(void);
// Calculates the number of frames to be sent.
// Should be used as standard output except the
// 'quiet' option (-q) has been specified.
int complexity(void);
// Purpose: Calculate time deltas of two timestamps stored in struct timeval.
// Subtract the "struct timeval" values X and Y, storing the result in RESULT.
// Return 1 if the difference is negative, otherwise 0.
int timestamp_subtract (struct mz_timestamp *x,
struct mz_timestamp *y,
struct mz_timestamp *result);
void timestamp_add (struct mz_timestamp *x,
struct mz_timestamp *y,
struct mz_timestamp *result);
// Returns a human readable timestamp in the string result.
// Optionally a prefix can be specified, for example if the
// timestamp is part of a filename.
//
// Example:
// char myTimeStamp[128];
//
// timestamp_human(myTimeStamp, NULL);
//
// => "20080718_155521"
//
// /* or with prefix */
//
// timestamp_human(myTimeStamp, "MZ_RTP_jitter_");
//
// => MZ_RTP_jitter_20080718_155521
//
int timestamp_human(char* result, const char* prefix);
// Returns a human readable timestamp in the string result.
// Optionally a prefix can be specified, for example if the
// timestamp is part of a filename.
//
// Example:
// char myTimeStamp[8];
//
// timestamp_hms (myTimeStamp);
//
// => "15:55:21"
int timestamp_hms(char* result);
// Initialize the rcv_rtp process: Read user parameters and initialize globals
int rcv_rtp_init(void);
// Defines the pcap handler and the callback function
int rcv_rtp(void);
// Print current RFC-Jitter on screen
void print_jitterbar (long int j, unsigned int d);
// Compares two 4-byte variables byte by byte
// returns 0 if identical, 1 if different
int compare4B (u_int8_t *ip1, u_int8_t *ip2);
// PURPOSE: Find usable network devices
//
// NOTE:
//
// 1. Ignores devices without IP address
// 2. Ignores loopback (etc)
//
// RETURN VALUES:
//
// 0 if usable device found (device_list[] and tx.device set)
// 1 if no usable device found
//
int lookupdev(void);
// For a given device name, find out the following parameters:
//
// - MTU
// - Network
// - Mask
// - Default GW (IP)
//
int get_dev_params (char *name);
// Handler function to do something when RTP messages are received
void got_rtp_packet(u_char *args,
const struct pcap_pkthdr *header, // statistics about the packet (see 'struct pcap_pkthdr')
const u_char *packet); // the bytestring sniffed
// Check if current system supports the nanosecond timer functions.
// Additionally, measure the precision.
// This function should be called upon program start.
//
int check_timer(void);
// This is the replacement for gettimeofday() which would result in 'jumps' if
// the system clock is adjusted (e. g. via a NTP process) and finally the jitter
// measurement would include wrong datapoints.
//
// Furthermore the function below utilizes the newer hi-res nanosecond timers.
void getcurtime (struct mz_timestamp *t);
// Only print out the help text for the 02.1Q option
void print_dot1Q_help(void);
// Determines ip and mac address of specified interface 'ifname'
// Caller must provide an unsigned char ip[4], mac[6]
//
int get_if_addr (char *ifname, unsigned char *ip, unsigned char *mac);
// Takes filename and prepends valid configuration/logging directory
// NOTE: filename is overwritten and must be big enough to hold full path!
int getfullpath_cfg (char *filename);
int getfullpath_log (char *filename);
// A safer replacement for strncpy which ensures \0-termination
char * mz_strncpy(char *dest, const char *src, size_t n);
// Helper function to count the number of arguments
// in the Mausezahn argument string (comma separated args)
// RETURN VALUE: Number of arguments
int number_of_args (char *str);
int arptable_add(struct device_struct *dev,
u_int8_t *sa,
u_int8_t *da,
u_int8_t *smac,
u_int8_t *sip,
u_int32_t sec,
u_int32_t nsec);
// Validate ARP requests
int arpwatch(struct device_struct *dev,
u_int8_t *sa,
u_int8_t *da,
u_int8_t *smac,
u_int8_t *sip,
u_int8_t *tmac,
u_int8_t *tip,
u_int32_t sec,
u_int32_t nsec);
#endif