├── AUTHORS ├── ChangeLog ├── LICENSE ├── Makefile ├── README ├── TODO ├── grain.raw ├── grain.wav └── hearnet.cpp /AUTHORS: -------------------------------------------------------------------------------- 1 | Hans Fugal wrote it. 2 | Von Fugal patched it. 3 | Leonard Ritter (paniq) made it sound cool. 4 | Mario Lang added filter expressions. 5 | Dmitry Baikov added suid and privilege dropping, and got rid of the evil mutex. 6 | -------------------------------------------------------------------------------- /ChangeLog: -------------------------------------------------------------------------------- 1 | 2006-10-10 Dmitry Baikov 2 | 3 | * make hearnet suid and drop privileges right after libpcap 4 | initialization. 5 | * Mutex in jack_process is a very bad thing. Moreover, it seems 6 | there's no need for it, as voice->active field serves as a mutex. 7 | 8 | N.B. It's good enough I think, but I wonder if we might need some 9 | sort of memory barrier, as noted in the comments. -- Hans 10 | 11 | 2005-09-30 Mario Lang 12 | 13 | * Added filter expression support, so now you can say 14 | ./hearnet eth0 "udp port 53" 15 | or whatever kind of filter expression you can think of. Very nice for 16 | listening in on just specific traffic patterns! 17 | 18 | 2005-07-26 Leonard Ritter 19 | 20 | * changed code so that it uses 32-voice polyphony and plays bridges / 21 | chromatic orders. 22 | 23 | as an effect, you get very harmonic sounds if packet sizes on a 24 | site are the same, and quite weird stuff if packet sizes vary. 25 | 26 | 2004-11-12 Hans Fugal 27 | 28 | * Incorporated patch from Von Fugal allowing multiple instances of hearnet 29 | to register with jackd, so you can hear more than one network at a time. 30 | 31 | 2003-11-13 Hans Fugal 32 | 33 | * Cleaned up and consolidated code 34 | * Can specify interface to listen to on command line now. 35 | * usage() 36 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. 5 | 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Library General 340 | Public License instead of this License. 341 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | CFLAGS+=-g 2 | LDFLAGS+=`pkg-config --cflags --libs jack` -lpcap 3 | version=0.0.9 4 | 5 | all: hearnet grain.raw 6 | -sudo make suid 7 | 8 | %.raw: %.wav 9 | sox $< -r 44800 -s -w $@ 10 | clean: 11 | rm -f hearnet *.o core* 12 | 13 | suid: hearnet 14 | chown root $< 15 | chmod u+s $< 16 | 17 | dist: all 18 | darcs dist -d hearnet-$(version) 19 | 20 | .PHONY: suid dist all clean 21 | -------------------------------------------------------------------------------- /README: -------------------------------------------------------------------------------- 1 | hearnet - listen to your network 2 | 3 | Requirements: 4 | - libpcap 5 | - libjack 6 | 7 | Synopsis: 8 | make 9 | sudo make suid 10 | # start jack if necessary 11 | ./hearnet 12 | 13 | Details: 14 | 15 | hearnet now drops priveleges when run with the suid bit set, which means 16 | you can hook it into your regular non-root jackd, and run it as a normal 17 | user. 18 | 19 | You can specify a filter expression (a la tcpdump), e.g.: 20 | 21 | ./hearnet eth0 udp port 53 22 | 23 | Very nice for listening to just one kind of traffic. Try this for an 24 | accompaniment to your VOIP conversation: 25 | 26 | ./hearnet eth0 udp port sip 27 | 28 | License: 29 | 30 | Copyright (C) 2003-2006 Hans Fugal 31 | 32 | This program is free software; you can redistribute it and/or modify 33 | it under the terms of the GNU General Public License as published by 34 | the Free Software Foundation; either version 2 of the License, or 35 | (at your option) any later version. 36 | 37 | This program is distributed in the hope that it will be useful, 38 | but WITHOUT ANY WARRANTY; without even the implied warranty of 39 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 40 | GNU General Public License for more details. 41 | -------------------------------------------------------------------------------- /TODO: -------------------------------------------------------------------------------- 1 | Sound on outbound packets too, using libnet. (stereo?) 2 | -------------------------------------------------------------------------------- /grain.raw: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fugalh/hearnet/7d8eb311b3668113a9ec2029ad4a1d1a83a39210/grain.raw -------------------------------------------------------------------------------- /grain.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fugalh/hearnet/7d8eb311b3668113a9ec2029ad4a1d1a83a39210/grain.wav -------------------------------------------------------------------------------- /hearnet.cpp: -------------------------------------------------------------------------------- 1 | /** 2 | * @file hearnet.c 3 | * 4 | * "Play" your network. 5 | * 6 | * @author Hans Fugal 7 | * 8 | * heavily modified by Leonard Ritter 9 | * 10 | */ 11 | 12 | #include 13 | #include 14 | #include 15 | #include 16 | #include 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include 25 | 26 | /* macros */ 27 | /// length of grain in samples 28 | #define GRAIN_PERIOD 44 29 | /// Our favorite irrational number 30 | #define PI 3.14159265358979 31 | 32 | #define MAX_VOICES 16 33 | 34 | /* data */ 35 | jack_port_t *output_port; 36 | jack_nframes_t srate; 37 | 38 | struct voice 39 | { 40 | bool active; 41 | float attack; 42 | float attacklength; 43 | float sinpos; 44 | float sinfreq; 45 | float amp; 46 | float decaylength; 47 | int age; 48 | }; 49 | 50 | voice voices[MAX_VOICES]; 51 | 52 | void init_voices() 53 | { 54 | memset(voices,0,sizeof(voices)); 55 | } 56 | 57 | voice* get_free_voice() 58 | { 59 | for (int index = 0; index < MAX_VOICES; index++) 60 | { 61 | if (!voices[index].active) 62 | return &voices[index]; 63 | } 64 | return 0; 65 | } 66 | 67 | float dbtoamp(float db) 68 | { 69 | return pow(2,db/6); 70 | } 71 | 72 | /*}}}*/ 73 | /** process nframes frames (jack callback) */ 74 | int process (jack_nframes_t nframes, void *arg)/*{{{*/ 75 | { 76 | jack_default_audio_sample_t *out = (jack_default_audio_sample_t *) jack_port_get_buffer (output_port, nframes); 77 | 78 | memset(out, 0, sizeof(jack_default_audio_sample_t)*nframes); 79 | 80 | for (int index = 0; index != MAX_VOICES; index++) 81 | { 82 | if (voices[index].active) 83 | { 84 | voice* current_voice = &voices[index]; 85 | float* pout = out; 86 | for (int s = 0; s != nframes; s++) 87 | { 88 | *pout += sin(current_voice->sinpos) * current_voice->amp * current_voice->attack; 89 | if (*pout > 1.0f) 90 | { 91 | *pout = 1.0f; 92 | } 93 | else if (*pout < -1.0f) 94 | { 95 | *pout = -1.0f; 96 | } 97 | if (current_voice->attack < 1.0f) 98 | { 99 | current_voice->attack += 1.0f / ((float)srate * current_voice->attacklength); 100 | } 101 | else 102 | { 103 | current_voice->amp *= 1.0f - (1.0f / ((float)srate * current_voice->decaylength)); 104 | } 105 | current_voice->sinpos += current_voice->sinfreq / (float)srate; 106 | if (current_voice->amp < 0.001) 107 | { 108 | current_voice->active = false; 109 | } 110 | pout++; 111 | } 112 | } 113 | } 114 | 115 | return 0; 116 | }/*}}}*/ 117 | /** jack callback to set sample rate */ 118 | int set_srate (jack_nframes_t nframes, void *arg)/*{{{*/ 119 | { 120 | printf("Setting srate to %luHz\n", nframes); 121 | srate = nframes; 122 | return 0; 123 | }/*}}}*/ 124 | /** jack error callback */ 125 | void error (const char *desc)/*{{{*/ 126 | { 127 | fprintf (stderr, "JACK error: %s\n", desc); 128 | }/*}}}*/ 129 | /** jack shutdown callback */ 130 | void shutdown(void *arg)/*{{{*/ 131 | { 132 | exit(1); 133 | }/*}}}*/ 134 | /** packet handler called by pcap_dispatch in main() */ 135 | void packet_handler(u_char * args, const struct pcap_pkthdr *pcap_hdr, const u_char * p)/*{{{*/ 136 | { 137 | voice* new_voice = get_free_voice(); 138 | if (new_voice) 139 | { 140 | memset(new_voice,0,sizeof(voice)); 141 | new_voice->sinpos = 0.0f; 142 | float factor2 = (float)(rand()%5 + 1); 143 | //float factor = pow(2,(float)(rand()%12)*4.0f / 12.0f); 144 | float factor = pow(2,(float)(pcap_hdr->len / 256.0f)*3.0f / 12.0f) * factor2; 145 | new_voice->sinfreq = 55.0f * 2.0f * 3.14159f * factor + ((float)(rand()%5) * factor); 146 | new_voice->amp = 0.5 / (float)(MAX_VOICES); // if they all add up, we dont get bursts 147 | new_voice->decaylength = (rand()%100 + 100) / 1000.0f; 148 | new_voice->attack = 0.0f; 149 | new_voice->attacklength = (rand()%20 + 1) / 1000.0f; // 10ms 150 | // Since we took out the mutex, we depend on this last 151 | // assignment not happening out-of-order. I don't know of a 152 | // portable memory barrier, so we'll just let it float. I 153 | // doubt it will be a noticeable problem, but if it is then 154 | // figure out some way to put a barrier here. 155 | new_voice->active = true; 156 | } 157 | 158 | }/*}}}*/ 159 | 160 | void usage(void)/*{{{*/ 161 | { 162 | fprintf(stderr, 163 | "\n" 164 | "usage: hearnet [interface [filter-expression]]\n" 165 | "Default interface is eth0.\n" 166 | ); 167 | exit(1); 168 | }/*}}}*/ 169 | 170 | /* main */ 171 | int main(int argc, char **argv)/*{{{*/ 172 | { 173 | int retval; 174 | char *dev = "eth0"; 175 | char client_name[80]; 176 | 177 | if (argc > 1) 178 | dev = argv[1]; 179 | 180 | // libpcap stuff /*{{{*/ 181 | pcap_t *hdl_pcap; 182 | char perrbuf[PCAP_ERRBUF_SIZE]; 183 | hdl_pcap = pcap_open_live(dev, BUFSIZ, 0, 0, perrbuf); 184 | if (hdl_pcap == NULL) 185 | { 186 | fprintf(stderr,"pcap_open_live; %s\n", perrbuf); 187 | usage(); 188 | } 189 | 190 | if (argc > 2) { 191 | bpf_program bpfprog; 192 | std::string s; 193 | for (int i=2; i