static void fill_senders(const send_proc_t* proc){
static const size_t header_size = sizeof(struct cap_header) + sizeof(struct sendhead);
const int oldest = oldest_packet(proc->nics, proc->semaphore);
/* couldn't find a packet, gave up waiting. we are probably terminating. */
if ( oldest == -1 ){
return;
}
/* timeout, flush all buffers */
if( oldest == -2 ){
flushAll(0);
return;
}
struct CI* CI = &_CI[oldest];
struct write_header* whead = CI_packet(CI, CI->readpos);
struct cap_header* head = whead->cp;
struct destination* dst = &MAsd[whead->destination];
/* calculate size of sendbuffer and compare with MTU */
const size_t payload_size = dst->buffer.end - dst->buffer.begin;
const int larger_mtu = payload_size + head->caplen + header_size > MPinfo->MTU;
/* if the current packet doesn't fit flush first */
if ( larger_mtu ){
assert(payload_size > 0 && dst->sendcount > 0 && "packet didn't fit into frame but frame is empty");
send_packet(dst);
}
/* copy packet into buffer */
copy_to_sendbuffer(dst, whead, CI);
}
void* sender_capfile(struct thread_data* td, void* ptr){
send_proc_t* proc = (send_proc_t*)ptr;
logmsg(stderr, SENDER, "Initializing (local mode).\n");
struct destination dst;
destination_init(&dst, 0);
dst.want_ethhead = 0;
dst.want_sendhead = 0;
//if ( (ret=createstream(&con.stream, &dest, NULL, mampid_get(MPinfo->id), MPinfo->comment)) != 0 ){
// logmsg(stderr, SENDER, " createstream() returned 0x%08lx: %s\n", ret, caputils_error_string(ret));
// sem_post(proc->semaphore); /* unlock main thread */
// return NULL;
//}
/* unlock main thread */
thread_init_finished(td, 0);
while( terminateThreads == 0 ){
int oldest = oldest_packet(proc->nics, proc->semaphore);
/* couldn't find a packet, gave up waiting. we are probably terminating. */
if ( oldest == -1 ){
continue;
}
struct CI* CI = &_CI[oldest];
struct write_header* whead = CI_packet(CI, CI->readpos);
copy_to_sendbuffer(&dst, whead, CI);
send_packet(&dst);
}
destination_free(&dst);
logmsg(stderr, SENDER, "Finished (local).\n");
return NULL;
}
static int oldest_packet(int nics, sem_t* semaphore){
int oldest = -1;
while( oldest == -1 ){ // Loop while we havent gotten any pkts.
if ( terminateThreads>0 ) {
return -1;
}
struct picotime timeOldest; // timestamp of oldest packet
timeOldest.tv_sec = UINT32_MAX;
timeOldest.tv_psec = UINT64_MAX;
for( int i = 0; i < nics; i++){
const int readpos = _CI[i].readpos;
const struct write_header* whead = CI_packet(&_CI[i], readpos);
const struct cap_header* head = whead->cp;
/* This destination has no packages yet */
if( whead->used == 0 ) {
continue;
}
if( timecmp(&head->ts, &timeOldest) < 0 ){
timeOldest.tv_sec = head->ts.tv_sec;
timeOldest.tv_psec = head->ts.tv_psec;
oldest = i;
}
}
/* No packages, wait until some arrives */
if ( oldest==-1 ){
int ret = wait_for_capture(semaphore);
if ( ret == ETIMEDOUT ){
return -2;
}
}
}
return oldest;
}
int capture_loop(struct CI* CI, struct capture_context* cap){
int ret;
/* initialize driver */
if ( cap->init && (ret=cap->init(cap)) != 0 ){
sem_post(CI->flag); /* unlock parent */
return ret; /* return error */
}
/* flag that thread is ready for capture */
sem_post(CI->flag);
/* wait until the MP is authorized until it starts capture */
wait_for_auth();
CI->writepos = 0; /* Reset write-position in memory */
while(terminateThreads==0){
/* calculate pointers into writebuffer */
struct write_header* whead = CI_packet(CI, CI->writepos);
struct cap_header* head = whead->cp;
unsigned char* packet_buffer = (unsigned char*)head->payload;
/* fill details into capture header */
fill_caphead(head, CI->iface, MPinfo->id);
/* read a packet */
ssize_t bytes = cap->read_packet(cap, packet_buffer, head);
if ( bytes < 0 ){ /* failed to read */
break;
} else if ( bytes == 0 ){ /* no data */
continue;
}
/* stats */
CI->packet_count++;
/* return -1 when no filter matches */
if ( push_packet(CI, whead, head, packet_buffer) == -1 ){
continue;
}
/* stats */
CI->matched_count++;
}
/* stop capture */
logmsg(verbose, CAPTURE, "CI[%d] stopping capture on %s.\n", CI->id, CI->iface);
/* show stats */
if ( cap->stats ){
cap->stats(cap);
}
/* driver cleanup */
if ( cap->destroy && (ret=cap->destroy(cap)) != 0 ){
return ret; /* return error */
}
return 0;
}