xstat_t *InitXStat(nffile_t *nffile) {
xstat_t *xs;
size_t block_size;
// extended by the record link 2*data[4], but does no harm
block_size = sizeof(xstat_t) + sizeof(data_block_header_t) + sizeof(flow_port_histogram_t) + sizeof(flow_bpp_histogram_t);
xs = (xstat_t *)malloc(block_size);
if ( !xs ) {
LogError("malloc() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
return NULL;
}
xs->block_header = (data_block_header_t *)((pointer_addr_t)xs + sizeof(xstat_t));
// preset the fields
xs->block_header->NumRecords = 2; // 2 histogram records are included
xs->block_header->size = block_size;
xs->block_header->id = Large_BLOCK_Type;
xs->block_header->flags = 0;
xs->port_histogram = (flow_port_histogram_t *)((pointer_addr_t)xs + sizeof(xstat_t) + sizeof(data_block_header_t));
xs->bpp_histogram = (flow_bpp_histogram_t *)((pointer_addr_t)xs + sizeof(xstat_t) + sizeof(data_block_header_t) + sizeof(flow_port_histogram_t) - 4); // without link pointer data[4]
// XXX add catalog entry
// SetFlag(nffile->file_header->flags, FLAG_EXTENDED_STATS);
ResetPortHistogram(xs->port_histogram);
ResetBppHistogram(xs->bpp_histogram);
return xs;
} // End of InitXStat
static void run(packet_function_t receive_packet, int socket, send_peer_t peer,
time_t twin, time_t t_begin, int report_seq, int use_subdirs, int compress, int do_xstat) {
common_flow_header_t *nf_header;
FlowSource_t *fs;
struct sockaddr_storage nf_sender;
socklen_t nf_sender_size = sizeof(nf_sender);
time_t t_start, t_now;
uint64_t export_packets;
uint32_t blast_cnt, blast_failures, ignored_packets;
uint16_t version;
ssize_t cnt;
void *in_buff;
int err;
char *string;
srecord_t *commbuff;
if ( !Init_v1() || !Init_v5_v7_input() || !Init_v9() || !Init_IPFIX() )
return;
in_buff = malloc(NETWORK_INPUT_BUFF_SIZE);
if ( !in_buff ) {
LogError("malloc() allocation error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
return;
}
// init vars
commbuff = (srecord_t *)shmem;
nf_header = (common_flow_header_t *)in_buff;
// Init each netflow source output data buffer
fs = FlowSource;
while ( fs ) {
// prepare file
fs->nffile = OpenNewFile(fs->current, NULL, compress, 0, NULL);
if ( !fs->nffile ) {
return;
}
if ( do_xstat ) {
fs->xstat = InitXStat(fs->nffile);
if ( !fs->xstat )
return;
}
// init vars
fs->bad_packets = 0;
fs->first_seen = 0xffffffffffffLL;
fs->last_seen = 0;
// next source
fs = fs->next;
}
export_packets = blast_cnt = blast_failures = 0;
t_start = t_begin;
cnt = 0;
periodic_trigger = 0;
ignored_packets = 0;
// wake up at least at next time slot (twin) + some Overdue time
alarm(t_start + twin + OVERDUE_TIME - time(NULL));
/*
* Main processing loop:
* this loop, continues until done = 1, set by the signal handler
* The while loop will be breaked by the periodic file renaming code
* for proper cleanup
*/
while ( 1 ) {
struct timeval tv;
/* read next bunch of data into beginn of input buffer */
if ( !done) {
#ifdef PCAP
// Debug code to read from pcap file, or from socket
cnt = receive_packet(socket, in_buff, NETWORK_INPUT_BUFF_SIZE , 0,
(struct sockaddr *)&nf_sender, &nf_sender_size);
// in case of reading from file EOF => -2
if ( cnt == -2 )
done = 1;
#else
cnt = recvfrom (socket, in_buff, NETWORK_INPUT_BUFF_SIZE , 0,
(struct sockaddr *)&nf_sender, &nf_sender_size);
#endif
if ( cnt == -1 && errno != EINTR ) {
LogError("ERROR: recvfrom: %s", strerror(errno));
continue;
}
if ( peer.hostname ) {
ssize_t len;
len = sendto(peer.sockfd, in_buff, cnt, 0, (struct sockaddr *)&(peer.addr), peer.addrlen);
if ( len < 0 ) {
LogError("ERROR: sendto(): %s", strerror(errno));
}
}
}
/* Periodic file renaming, if time limit reached or if we are done. */
// t_now = time(NULL);
gettimeofday(&tv, NULL);
t_now = tv.tv_sec;
if ( ((t_now - t_start) >= twin) || done ) {
char subfilename[64];
struct tm *now;
char *subdir;
alarm(0);
now = localtime(&t_start);
// prepare sub dir hierarchy
if ( use_subdirs ) {
subdir = GetSubDir(now);
if ( !subdir ) {
// failed to generate subdir path - put flows into base directory
LogError("Failed to create subdir path!");
// failed to generate subdir path - put flows into base directory
subdir = NULL;
snprintf(subfilename, 63, "nfcapd.%i%02i%02i%02i%02i%02i",
now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec);
} else {
snprintf(subfilename, 63, "%s/nfcapd.%i%02i%02i%02i%02i%02i", subdir,
now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec);
}
} else {
subdir = NULL;
snprintf(subfilename, 63, "nfcapd.%i%02i%02i%02i%02i%02i",
now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min, now->tm_sec);
}
subfilename[63] = '\0';
// for each flow source update the stats, close the file and re-initialize the new file
fs = FlowSource;
while ( fs ) {
char nfcapd_filename[MAXPATHLEN];
char error[255];
nffile_t *nffile = fs->nffile;
if ( verbose ) {
// Dump to stdout
format_file_block_header(nffile->block_header, &string, 0);
printf("%s\n", string);
}
if ( nffile->block_header->NumRecords ) {
// flush current buffer to disc
if ( WriteBlock(nffile) <= 0 )
LogError("Ident: %s, failed to write output buffer to disk: '%s'" , fs->Ident, strerror(errno));
} // else - no new records in current block
// prepare filename
snprintf(nfcapd_filename, MAXPATHLEN-1, "%s/%s", fs->datadir, subfilename);
nfcapd_filename[MAXPATHLEN-1] = '\0';
// update stat record
// if no flows were collected, fs->last_seen is still 0
// set first_seen to start of this time slot, with twin window size.
if ( fs->last_seen == 0 ) {
fs->first_seen = (uint64_t)1000 * (uint64_t)t_start;
fs->last_seen = (uint64_t)1000 * (uint64_t)(t_start + twin);
}
nffile->stat_record->first_seen = fs->first_seen/1000;
nffile->stat_record->msec_first = fs->first_seen - nffile->stat_record->first_seen*1000;
nffile->stat_record->last_seen = fs->last_seen/1000;
nffile->stat_record->msec_last = fs->last_seen - nffile->stat_record->last_seen*1000;
if ( fs->xstat ) {
if ( WriteExtraBlock(nffile, fs->xstat->block_header ) <= 0 )
LogError("Ident: %s, failed to write xstat buffer to disk: '%s'" , fs->Ident, strerror(errno));
ResetPortHistogram(fs->xstat->port_histogram);
ResetBppHistogram(fs->xstat->bpp_histogram);
}
// Flush Exporter Stat to file
FlushExporterStats(fs);
// Close file
CloseUpdateFile(nffile, fs->Ident);
if ( subdir && !SetupSubDir(fs->datadir, subdir, error, 255) ) {
// in this case the flows get lost! - the rename will fail
// but this should not happen anyway, unless i/o problems, inode problems etc.
LogError("Ident: %s, Failed to create sub hier directories: %s", fs->Ident, error );
}
// if rename fails, we are in big trouble, as we need to get rid of the old .current file
// otherwise, we will loose flows and can not continue collecting new flows
err = rename(fs->current, nfcapd_filename);
if ( err ) {
LogError("Ident: %s, Can't rename dump file: %s", fs->Ident, strerror(errno));
LogError("Ident: %s, Serious Problem! Fix manually", fs->Ident);
if ( launcher_pid )
commbuff->failed = 1;
// we do not update the books here, as the file failed to rename properly
// otherwise the books may be wrong
} else {
struct stat fstat;
if ( launcher_pid )
commbuff->failed = 0;
// Update books
stat(nfcapd_filename, &fstat);
UpdateBooks(fs->bookkeeper, t_start, 512*fstat.st_blocks);
}
// log stats
LogInfo("Ident: '%s' Flows: %llu, Packets: %llu, Bytes: %llu, Sequence Errors: %u, Bad Packets: %u",
fs->Ident, (unsigned long long)nffile->stat_record->numflows, (unsigned long long)nffile->stat_record->numpackets,
(unsigned long long)nffile->stat_record->numbytes, nffile->stat_record->sequence_failure, fs->bad_packets);
// reset stats
fs->bad_packets = 0;
fs->first_seen = 0xffffffffffffLL;
fs->last_seen = 0;
if ( !done ) {
nffile = OpenNewFile(fs->current, nffile, compress, 0, NULL);
if ( !nffile ) {
LogError("killed due to fatal error: ident: %s", fs->Ident);
break;
}
/* XXX needs fixing */
if ( fs->xstat ) {
// to be implemented
}
}
// Dump all extension maps and exporters to the buffer
FlushStdRecords(fs);
// next flow source
fs = fs->next;
} // end of while (fs)
// All flow sources updated - signal launcher if required
if ( launcher_pid ) {
// Signal launcher
// prepare filename for %f expansion
strncpy(commbuff->fname, subfilename, FNAME_SIZE-1);
commbuff->fname[FNAME_SIZE-1] = 0;
snprintf(commbuff->tstring, 16, "%i%02i%02i%02i%02i",
now->tm_year + 1900, now->tm_mon + 1, now->tm_mday, now->tm_hour, now->tm_min);
commbuff->tstring[15] = 0;
commbuff->tstamp = t_start;
if ( subdir )
strncpy(commbuff->subdir, subdir, FNAME_SIZE);
else
commbuff->subdir[0] = '\0';
if ( launcher_alive ) {
LogInfo("Signal launcher");
kill(launcher_pid, SIGHUP);
} else
LogError("ERROR: Launcher did unexpectedly!");
}
LogInfo("Total ignored packets: %u", ignored_packets);
ignored_packets = 0;
if ( done )
break;
// update alarm for next cycle
t_start += twin;
/* t_start = filename time stamp: begin of slot
* + twin = end of next time interval
* + OVERDUE_TIME = if no data is collected, this is at latest to act
* - , now->tm_sect_now = difference value to now
*/
alarm(t_start + twin + OVERDUE_TIME - t_now);
}
/* check for error condition or done . errno may only be EINTR */
if ( cnt < 0 ) {
if ( periodic_trigger ) {
// alarm triggered, no new flow data
periodic_trigger = 0;
continue;
}
if ( done )
// signaled to terminate - exit from loop
break;
else {
/* this should never be executed as it should be caught in other places */
LogError("error condition in '%s', line '%d', cnt: %i", __FILE__, __LINE__ ,(int)cnt);
continue;
}
}
/* enough data? */
if ( cnt == 0 )
continue;
// get flow source record for current packet, identified by sender IP address
fs = GetFlowSource(&nf_sender);
if ( fs == NULL ) {
fs = AddDynamicSource(&FlowSource, &nf_sender);
if ( fs == NULL ) {
LogError("Skip UDP packet. Ignored packets so far %u packets", ignored_packets);
ignored_packets++;
continue;
}
if ( InitBookkeeper(&fs->bookkeeper, fs->datadir, getpid(), launcher_pid) != BOOKKEEPER_OK ) {
LogError("Failed to initialise bookkeeper for new source");
// fatal error
return;
}
fs->nffile = OpenNewFile(fs->current, NULL, compress, 0, NULL);
if ( !fs->nffile ) {
LogError("Failed to open new collector file");
return;
}
}
/* check for too little data - cnt must be > 0 at this point */
if ( cnt < sizeof(common_flow_header_t) ) {
LogError("Ident: %s, Data length error: too little data for common netflow header. cnt: %i",fs->Ident, (int)cnt);
fs->bad_packets++;
continue;
}
fs->received = tv;
/* Process data - have a look at the common header */
version = ntohs(nf_header->version);
switch (version) {
case 1:
Process_v1(in_buff, cnt, fs);
break;
case 5: // fall through
case 7:
Process_v5_v7(in_buff, cnt, fs);
break;
case 9:
Process_v9(in_buff, cnt, fs);
break;
case 10:
Process_IPFIX(in_buff, cnt, fs);
break;
case 255:
// blast test header
if ( verbose ) {
uint16_t count = ntohs(nf_header->count);
if ( blast_cnt != count ) {
// LogError("Missmatch blast check: Expected %u got %u\n", blast_cnt, count);
blast_cnt = count;
blast_failures++;
} else {
blast_cnt++;
}
if ( blast_cnt == 65535 ) {
fprintf(stderr, "Total missed packets: %u\n", blast_failures);
done = 1;
}
break;
}
default:
// data error, while reading data from socket
LogError("Ident: %s, Error reading netflow header: Unexpected netflow version %i", fs->Ident, version);
fs->bad_packets++;
continue;
// not reached
break;
}
// each Process_xx function has to process the entire input buffer, therefore it's empty now.
export_packets++;
// flush current buffer to disc
if ( fs->nffile->block_header->size > BUFFSIZE ) {
// fishy! - we already wrote into someone elses memory! - I'm sorry
// reset output buffer - data may be lost, as we don not know, where it happen
fs->nffile->block_header->size = 0;
fs->nffile->block_header->NumRecords = 0;
fs->nffile->buff_ptr = (void *)((pointer_addr_t)fs->nffile->block_header + sizeof(data_block_header_t) );
LogError("### Software bug ### Ident: %s, output buffer overflow: expect memory inconsitency", fs->Ident);
}
}
if ( verbose && blast_failures ) {
fprintf(stderr, "Total missed packets: %u\n", blast_failures);
}
free(in_buff);
fs = FlowSource;
while ( fs ) {
DisposeFile(fs->nffile);
fs = fs->next;
}
} /* End of run */