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#ifdef LINUX
// find a replacement for <linux/if_packet.h>
// then this will work on other UNIXes
#include "m_pd.h"
#include "ext13.h"
#include <sys/types.h>
#include <string.h>
#include <math.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <net/if.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netdb.h>
#include <linux/if_packet.h>
/* ------------------------ promiscous_tilde~ ----------------------------- */
#define DEFAULT_NIC "eth0" //NIC
static t_class *promiscous_tilde_class;
typedef struct _promiscous_tilde
{
t_object x_obj;
int opened;
int sock;
char* cbuf;
t_symbol* interface;
} t_promiscous_tilde;
static int setnic_promisc(char *nic_name){
int sock; // socket desc
struct ifreq f;
struct sockaddr_ll sll;
memset(&sll, 0, sizeof(sll));
sll.sll_family = AF_PACKET;
sll.sll_protocol = htons(ETH_P_ALL);
//if( (sock = socket(AF_INET, SOCK_PACKET, htons(ETH_P_ALL))) < 0){
if( (sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0){
post("promiscous~ failed open socket, must be root (euid)");
return(-1);
}
//strcpy(f.ifr_name, nic_name);
strncpy(f.ifr_name, nic_name, sizeof(f.ifr_name));
if (ioctl(sock, SIOCGIFINDEX, &f) < 0) {
post ("promiscous~: error on setting if index");
}
#ifdef DEBUG
post("promiscous~: ifname : %s",f.ifr_name);
post("promiscous~: ifindex: %d",f.ifr_ifindex);
#endif
sll.sll_ifindex = f.ifr_ifindex;
if (bind(sock, (struct sockaddr *) &sll, sizeof(sll)) < 0) {
post("promiscous~: couldnt bind to interface: %s", f.ifr_name);
}
if( ioctl(sock, SIOCGIFFLAGS, &f) < 0) {
post("promiscous~ failed to get interface flags, continue anyway");
return(sock);
}
f.ifr_flags |= IFF_PROMISC;
if( ioctl(sock, SIOCSIFFLAGS, &f) < 0) {
post("promiscous~ failed to set promisous mode , continue anyway");
}
return(sock);
}
t_int *promiscous_tilde_perform(t_int *w)
{
t_promiscous_tilde* x = (t_promiscous_tilde*)(w[1]);
int n = (int)(w[3]);/*number of samples*/
int l = 0;
int ll = 0;
int r;
int t;
static unsigned char packet;
fd_set fdset;
struct timeval timeout;
t_float* out = (t_float *)w[2];
int cptr[n];
if (x->opened){
timeout.tv_sec = 0;
timeout.tv_usec = 0;
FD_ZERO(&fdset);
FD_SET(x->sock,&fdset);
if (r = select(x->sock+1,&fdset,NULL,NULL,&timeout) && x->sock){
l = recv(x->sock, &cptr,n, 0);
//l = read(x->sock, (char*) &cptr,n);
};
if (l < 0) l = 0;
while (l--){
t = cptr[n-l];
//post("sample: %d",t);
//*out++ = t / 32767.;
*out++ = (float) t / (float) pow(2, 32);
ll++;
}
}
while (ll < n){
*out++ = 0.;
//post("sample: %f",*out);
ll++;
}
return (w + 4);
}
static void promiscous_tilde_dsp(t_promiscous_tilde *x, t_signal **sp)
{
dsp_add(promiscous_tilde_perform, 3, x, sp[0]->s_vec,
sp[0]->s_n);
}
static void promiscous_tilde_free(t_promiscous_tilde *x){
/*LATER*/
}
static void *promiscous_tilde_new(t_symbol *ifname)
{
t_promiscous_tilde *x = (t_promiscous_tilde *)pd_new(promiscous_tilde_class);
outlet_new(&x->x_obj, gensym("signal"));
if (*ifname->s_name)
x->interface = ifname;
else
x->interface = gensym(DEFAULT_NIC);
if((x->sock = setnic_promisc(x->interface->s_name))<0){
post ("could not open interface");
x->opened = 0;
}else{
x->opened = 1;
}
return (x);
}
void promiscous_tilde_setup(void)
{
promiscous_tilde_class = class_new(gensym("promiscous~"), (t_newmethod) promiscous_tilde_new, 0,
sizeof(t_promiscous_tilde), CLASS_NOINLET, A_DEFSYM, 0);
class_addmethod(promiscous_tilde_class, (t_method) promiscous_tilde_dsp, gensym("dsp"), 0);
}
#endif
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