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nfdump/bin/nfpcapd.c
phaag 758237b450 Initial git release 1.6.13
2015-10-03 14:06:34 +02:00

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/*
* Copyright (c) 2014, Peter Haag
* Copyright (c) 2013, Peter Haag
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the author nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $Author$
*
* $Id$
*
* $LastChangedRevision$
*
*/
/* $Id: pcapd.c 2778 2012-03-19 09:23:26Z roethlis $ */
#include "config.h"
#ifdef HAVE_FEATURES_H
#include <features.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdarg.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <pthread.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <arpa/inet.h>
#ifdef HAVE_NET_BPF_H
# include <net/bpf.h>
#else
#ifdef HAVE_PCAP_BPF_H
# include <pcap-bpf.h>
#else
# error missing bpf header
#endif
#endif
#include <pcap.h>
#include "util.h"
#include "nffile.h"
#include "nfx.h"
#include "nf_common.h"
#include "nfnet.h"
#include "flist.h"
#include "nfstatfile.h"
#include "bookkeeper.h"
#include "nfxstat.h"
#include "collector.h"
#include "exporter.h"
#ifdef HAVE_FTS_H
# include <fts.h>
#else
# include "fts_compat.h"
#define fts_children fts_children_compat
#define fts_close fts_close_compat
#define fts_open fts_open_compat
#define fts_read fts_read_compat
#define fts_set fts_set_compat
#endif
#include "expire.h"
#include "flowtree.h"
#include "netflow_pcap.h"
#include "pcaproc.h"
#define TIME_WINDOW 300
#define SNAPLEN 200
#define PROMISC 1
#define TIMEOUT 500
#define FILTER ""
#define DEFAULT_DIR "/var/tmp"
#ifndef DLT_LINUX_SLL
#define DLT_LINUX_SLL 113
#endif
#ifndef DEVEL
# define dbg_printf(...) /* printf(__VA_ARGS__) */
#else
# define dbg_printf(...) printf(__VA_ARGS__)
#endif
int verbose = 0;
/*
* global static var: used by interrupt routine
*/
#define PCAP_DUMPFILE "pcap.current"
static const char *nfdump_version = VERSION;
static int launcher_alive, periodic_trigger, launcher_pid;
static pthread_mutex_t m_done = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t terminate = PTHREAD_COND_INITIALIZER;
static pthread_key_t buffer_key;
uint32_t linktype;
uint32_t linkoffset;
// Common thread info struct
typedef struct thread_info_s {
pthread_t tid;
int done;
int exit;
} thread_info_t;
typedef struct p_pcap_flush_thread_args_s {
// common thread info struct
pthread_t tid;
int done;
int exit;
// the parent
pthread_t parent;
// arguments
int subdir_index;
char *pcap_datadir;
pcap_dev_t *pcap_dev;
pcapfile_t *pcapfile;
} p_pcap_flush_thread_args_t;
typedef struct p_packet_thread_args_s {
// common thread info struct
pthread_t tid;
int done;
int exit;
// the parent
pthread_t parent;
// arguments
NodeList_t *NodeList; // push new nodes into this list
pcap_dev_t *pcap_dev;
time_t t_win;
int subdir_index;
char *pcap_datadir;
int live;
} p_packet_thread_args_t;
typedef struct p_flow_thread_args_s {
// common thread info struct
pthread_t tid;
int done;
int exit;
// the parent
pthread_t parent;
// arguments
NodeList_t *NodeList; // pop new nodes from this list
FlowSource_t *fs;
time_t t_win;
int subdir_index;
int compress;
} p_flow_thread_args_t;
/*
* Function prototypes
*/
static void usage(char *name);
static void daemonize(void);
static void Interrupt_handler(int sig);
static void SetPriv(char *userid, char *groupid );
static pcap_dev_t *setup_pcap_live(char *device, char *filter, int snaplen);
static pcap_dev_t *setup_pcap_Ffile(FILE *fp, char *filter, int snaplen);
static pcap_dev_t *setup_pcap_file(char *pcap_file, char *filter, int snaplen);
static void WaitDone(void);
static void SignalThreadTerminate(thread_info_t *thread_info, pthread_cond_t *thread_cond );
static void *p_pcap_flush_thread(void *thread_data);
static void *p_flow_thread(void *thread_data);
static void *p_packet_thread(void *thread_data);
/*
* Functions
*/
static void usage(char *name) {
printf("usage %s [options] [\"pcap filter\"]\n"
"-h\t\tthis text you see right here\n"
"-u userid\tChange user to username\n"
"-g groupid\tChange group to groupname\n"
"-i device\tspecify a device\n"
"-r pcapfile\tspecify a file to read from\n"
"-B cache buckets\tset the number of cache buckets. (default 1048576)\n"
"-s snaplen\tset the snapshot length\n"
"-l flowdir \tset the flow output directory. (no default) \n"
"-l pcapdir \tset the pcapdir directory. (optional) \n"
"-S subdir\tSub directory format. see nfcapd(1) for format\n"
"-I Ident\tset the ident string for stat file. (default 'none')\n"
"-P pidfile\tset the PID file\n"
"-t time frame\tset the time window to rotate pcap/nfcapd file\n"
"-z\t\tCompress flows in output file.\n"
"-E\t\tPrint extended format of netflow data. for debugging purpose only.\n"
"-T\t\tInclude extension tags in records.\n"
"-D\t\tdetach from terminal (daemonize)\n"
, name);
} // End of usage
static void Interrupt_handler(int sig) {
pthread_t tid = pthread_self();
thread_info_t *thread_info;
LogInfo("[%lu] Signal handler: %i", (long unsigned)tid, sig);
thread_info = (thread_info_t *)pthread_getspecific(buffer_key);
if ( !thread_info ) {
LogError("[%lu] Interrupt_handler() failed to get thread specific data block\n", (long unsigned)tid);
} else {
if ( thread_info->tid != tid ) {
LogError("[%lu] Interrupt_handler() missmatch tid in thread_info\n", (long unsigned)tid);
} else {
thread_info->done = 1;
}
}
} // End of signal_handler
static void daemonize(void) {
int fd;
switch (fork()) {
case 0:
// child
break;
case -1:
// error
fprintf(stderr, "fork() error: %s\n", strerror(errno));
exit(0);
break;
default:
// parent
_exit(0);
}
if (setsid() < 0) {
fprintf(stderr, "setsid() error: %s\n", strerror(errno));
exit(0);
}
// Double fork
switch (fork()) {
case 0:
// child
break;
case -1:
// error
fprintf(stderr, "fork() error: %s\n", strerror(errno));
exit(0);
break;
default:
// parent
_exit(0);
}
fd = open("/dev/null", O_RDONLY);
if (fd != 0) {
dup2(fd, 0);
close(fd);
}
fd = open("/dev/null", O_WRONLY);
if (fd != 1) {
dup2(fd, 1);
close(fd);
}
fd = open("/dev/null", O_WRONLY);
if (fd != 2) {
dup2(fd, 2);
close(fd);
}
} // End of daemonize
static void SetPriv(char *userid, char *groupid ) {
struct passwd *pw_entry;
struct group *gr_entry;
uid_t myuid, newuid, newgid;
int err;
if ( userid == 0 && groupid == 0 )
return;
newuid = newgid = 0;
myuid = getuid();
if ( myuid != 0 ) {
LogError("Only root wants to change uid/gid");
fprintf(stderr, "ERROR: Only root wants to change uid/gid\n");
exit(255);
}
if ( userid ) {
pw_entry = getpwnam(userid);
newuid = pw_entry ? pw_entry->pw_uid : atol(userid);
if ( newuid == 0 ) {
fprintf (stderr,"Invalid user '%s'\n", userid);
exit(255);
}
}
if ( groupid ) {
gr_entry = getgrnam(groupid);
newgid = gr_entry ? gr_entry->gr_gid : atol(groupid);
if ( newgid == 0 ) {
fprintf (stderr,"Invalid group '%s'\n", groupid);
exit(255);
}
err = setgid(newgid);
if ( err ) {
LogError("Can't set group id %ld for group '%s': %s", (long)newgid, groupid, strerror(errno));
fprintf (stderr,"Can't set group id %ld for group '%s': %s\n", (long)newgid, groupid, strerror(errno));
exit(255);
}
}
if ( newuid ) {
err = setuid(newuid);
if ( err ) {
LogError("Can't set user id %ld for user '%s': %s", (long)newuid, userid, strerror(errno));
fprintf (stderr,"Can't set user id %ld for user '%s': %s\n", (long)newuid, userid, strerror(errno));
exit(255);
}
}
} // End of SetPriv
static pcap_dev_t *setup_pcap_live(char *device, char *filter, int snaplen) {
pcap_t *handle;
pcap_dev_t *pcap_dev;
char errbuf[PCAP_ERRBUF_SIZE];
bpf_u_int32 mask; /* Our netmask */
bpf_u_int32 net; /* Our IP */
struct bpf_program filter_code;
uint32_t linkoffset, linktype;
dbg_printf("Enter function: %s\n", __FUNCTION__);
if (device == NULL) {
device = pcap_lookupdev(errbuf);
if (device == NULL) {
LogError("Couldn't find default device: %s", errbuf);
return NULL;
}
}
/* Find the properties for the device */
if (pcap_lookupnet(device, &net, &mask, errbuf) == -1) {
LogError("Couldn't get netmask for device %s: %s", device, errbuf);
net = 0;
mask = 0;
}
/*
* Open the packet capturing device with the following values:
*
* SNAPLEN: User defined or 200 bytes
* PROMISC: on
* The interface needs to be in promiscuous mode to capture all
* network traffic on the localnet.
* TIMEOUT: 500ms
* A 500 ms timeout is probably fine for most networks. For
* architectures that support it, you might want tune this value
* depending on how much traffic you're seeing on the network.
*/
handle = pcap_open_live(device, snaplen, PROMISC, TIMEOUT, errbuf);
if (handle == NULL) {
LogError("Couldn't open device %s: %s", device, errbuf);
return NULL;
}
// XXX
// int pcap_set_buffer_size(pcap_t *p, int buffer_size);
if ( filter ) {
/* Compile and apply the filter */
if (pcap_compile(handle, &filter_code, filter, 0, net) == -1) {
LogError("Couldn't parse filter %s: %s", filter, pcap_geterr(handle));
return NULL;
}
if (pcap_setfilter(handle, &filter_code) == -1) {
LogError("Couldn't install filter %s: %s", filter, pcap_geterr(handle));
return NULL;
}
}
pcap_dev = (pcap_dev_t *)calloc(1, sizeof(pcap_dev_t));
if ( !pcap_dev ) {
LogError("malloc() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
return NULL;
}
linkoffset = 0;
linktype = pcap_datalink(handle);
switch ( linktype ) {
case DLT_RAW:
linkoffset = 0;
break;
case DLT_PPP:
linkoffset = 2;
break;
case DLT_NULL:
linkoffset = 4;
break;
case DLT_LOOP:
linkoffset = 14;
break;
case DLT_EN10MB:
linkoffset = 14;
break;
case DLT_LINUX_SLL:
linkoffset = 16;
break;
case DLT_IEEE802_11:
linkoffset = 22;
break;
default:
LogError("Unsupported data link type %i", linktype);
return NULL;
}
pcap_dev->handle = handle;
pcap_dev->snaplen = snaplen;
pcap_dev->linkoffset = linkoffset;
pcap_dev->linktype = linktype;
return pcap_dev;
} // End of setup_pcap_live
static pcap_dev_t *setup_pcap_file(char *pcap_file, char *filter, int snaplen) {
FILE *fp;
fp = fopen(pcap_file, "rb");
if ( !fp ) {
LogError("Couldn't open file: %s: %s", pcap_file, strerror(errno));
return NULL;
}
return setup_pcap_Ffile(fp, filter, snaplen);
} // End of setup_pcap_file
static pcap_dev_t *setup_pcap_Ffile(FILE *fp, char *filter, int snaplen) {
pcap_t *handle;
pcap_dev_t *pcap_dev;
char errbuf[PCAP_ERRBUF_SIZE];
uint32_t linkoffset, linktype;
dbg_printf("Enter function: %s\n", __FUNCTION__);
if ( !fp )
return NULL;
handle = pcap_fopen_offline(fp, errbuf);
if (handle == NULL) {
LogError("Couldn't attach FILE handle %s", errbuf);
return NULL;
}
if ( filter ) {
struct bpf_program filter_code;
bpf_u_int32 netmask = 0;
// Compile and apply the filter
if (pcap_compile(handle, &filter_code, filter, 0, netmask) == -1) {
LogError("Couldn't parse filter %s: %s", filter, pcap_geterr(handle));
return NULL;
}
if (pcap_setfilter(handle, &filter_code) == -1) {
LogError("Couldn't install filter %s: %s", filter, pcap_geterr(handle));
return NULL;
}
}
linkoffset = 0;
linktype = pcap_datalink(handle);
switch ( linktype ) {
case DLT_RAW:
linkoffset = 0;
break;
case DLT_PPP:
linkoffset = 2;
break;
case DLT_NULL:
linkoffset = 4;
break;
case DLT_LOOP:
linkoffset = 14;
break;
case DLT_EN10MB:
linkoffset = 14;
break;
case DLT_LINUX_SLL:
linkoffset = 16;
break;
case DLT_IEEE802_11:
linkoffset = 22;
break;
default:
LogError("Unsupported data link type %i", linktype);
return NULL;
}
pcap_dev = (pcap_dev_t *)calloc(1, sizeof(pcap_dev_t));
if ( !pcap_dev ) {
LogError("malloc() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
return NULL;
}
pcap_dev->handle = handle;
pcap_dev->snaplen = snaplen;
pcap_dev->linkoffset = linkoffset;
pcap_dev->linktype = linktype;
return pcap_dev;
} // End of setup_pcap_file
static void SignalThreadTerminate(thread_info_t *thread_info, pthread_cond_t *thread_cond ) {
if ( !thread_info->done ) {
dbg_printf("Signal thread[%lu] to terminate\n", (long unsigned)thread_info->tid);
if ( pthread_kill(thread_info->tid, SIGUSR2) != 0 ) {
dbg_printf("Failed to signal thread[%lu]\n", (long unsigned)thread_info->tid);
}
// in case of a condition - signal condition
if ( thread_cond )
pthread_cond_signal(thread_cond);
} else {
dbg_printf("thread[%lu] gone already\n", (long unsigned)thread_info->tid);
}
if( pthread_join(thread_info->tid, NULL) == 0 ) {
dbg_printf("thread %lu joined\n", (long unsigned)thread_info->tid);
} else {
dbg_printf("thread %lu no join\n", (long unsigned)thread_info->tid);
}
LogInfo("Exit status thread[%lu]: %i", thread_info->tid, thread_info->exit);
} // End of SignalThreadEnd
__attribute__((noreturn)) static void *p_flow_thread(void *thread_data) {
// argument dispatching
p_flow_thread_args_t *args = (p_flow_thread_args_t *)thread_data;
time_t t_win = args->t_win;
int subdir_index = args->subdir_index;
int compress = args->compress;
FlowSource_t *fs = args->fs;
// locals
time_t t_start, t_clock, t_udp_flush;
int err, done;
done = 0;
args->done = 0;
args->exit = 0;
err = pthread_setspecific( buffer_key, (void *)args );
if ( err ) {
LogError("[%lu] pthread_setspecific() error in %s line %d: %s\n",
(long unsigned)args->tid, __FILE__, __LINE__, strerror(errno) );
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
}
if ( !Init_pcap2nf() ) {
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
}
// prepare file
fs->nffile = OpenNewFile(fs->current, NULL, compress, 0, NULL);
if ( !fs->nffile ) {
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
}
fs->xstat = NULL;
// init vars
fs->bad_packets = 0;
fs->first_seen = 0xffffffffffffLL;
fs->last_seen = 0;
t_start = 0;
t_clock = 0;
t_udp_flush = 0;
while ( 1 ) {
struct FlowNode *Node;
Node = Pop_Node(args->NodeList, &args->done);
if ( Node ) {
t_clock = Node->t_last.tv_sec;
dbg_printf("p_flow_thread() Next Node\n");
} else {
done = args->done;
dbg_printf("p_flow_thread() NULL Node\n");
}
if ( t_start == 0 ) {
t_udp_flush = t_start = t_clock - (t_clock % t_win);
}
if (((t_clock - t_start) >= t_win) || done) { /* rotate file */
struct tm *when;
nffile_t *nffile;
char FullName[MAXPATHLEN];
char netflowFname[128];
char error[256];
char *subdir;
// flush all flows to disk
DumpNodeStat();
uint32_t NumFlows = Flush_FlowTree(fs);
when = localtime(&t_start);
nffile = fs->nffile;
// prepare sub dir hierarchy
if ( subdir_index ) {
subdir = GetSubDir(when);
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(netflowFname, 127, "nfcapd.%i%02i%02i%02i%02i",
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
} else {
snprintf(netflowFname, 127, "%s/nfcapd.%i%02i%02i%02i%02i", subdir,
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
}
} else {
subdir = NULL;
snprintf(netflowFname, 127, "nfcapd.%i%02i%02i%02i%02i",
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
}
netflowFname[127] = '\0';
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 ( 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 full filename
snprintf(FullName, MAXPATHLEN-1, "%s/%s", fs->datadir, netflowFname);
FullName[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 + t_win);
}
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;
// Flush Exporter Stat to file
FlushExporterStats(fs);
// Close file
CloseUpdateFile(nffile, fs->Ident);
// 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
if ( !RenameAppend(fs->current, FullName) ) {
LogError("Ident: %s, Can't rename dump file: %s", fs->Ident, strerror(errno));
LogError("Ident: %s, Serious Problem! Fix manually", fs->Ident);
/* XXX
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;
/* XXX
if ( launcher_pid )
commbuff->failed = 0;
*/
// Update books
stat(FullName, &fstat);
UpdateBooks(fs->bookkeeper, t_start, 512*fstat.st_blocks);
}
LogInfo("Ident: '%s' Flows: %llu, Packets: %llu, Bytes: %llu, Max Flows: %u",
fs->Ident, (unsigned long long)nffile->stat_record->numflows, (unsigned long long)nffile->stat_record->numpackets,
(unsigned long long)nffile->stat_record->numbytes, NumFlows);
// reset stats
fs->bad_packets = 0;
fs->first_seen = 0xffffffffffffLL;
fs->last_seen = 0;
// Dump all extension maps and exporters to the buffer
FlushStdRecords(fs);
if ( done )
break;
t_start = t_clock - (t_clock % t_win);
nffile = OpenNewFile(fs->current, nffile, compress, 0, NULL);
if ( !nffile ) {
LogError("Fatal: OpenNewFile() failed for ident: %s", fs->Ident);
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
break;
}
}
if (((t_clock - t_udp_flush) >= 10) || !done) { /* flush inactive UDP list */
UDPexpire(fs, t_clock - 10 );
t_udp_flush = t_clock;
}
if ( Node->fin != SIGNAL_NODE )
// Process the Node
ProcessFlowNode(fs, Node);
}
while ( fs ) {
DisposeFile(fs->nffile);
fs = fs->next;
}
LogInfo("Terminating flow processng: exit: %i", args->exit);
dbg_printf("End flow thread[%lu]\n", (long unsigned)args->tid);
pthread_exit((void *)args);
/* NOTREACHED */
} // End of p_flow_thread
__attribute__((noreturn)) static void *p_pcap_flush_thread(void *thread_data) {
// argument dispatching
p_pcap_flush_thread_args_t *args = (p_pcap_flush_thread_args_t *)thread_data;
char *pcap_datadir = args->pcap_datadir;
pcap_dev_t *pcap_dev = args->pcap_dev;
pcapfile_t *pcapfile = args->pcapfile;
char pcap_dumpfile[MAXPATHLEN];
int err;
int runs = 0;
dbg_printf("New flush thread[%lu]\n", (long unsigned)args->tid);
args->done = 0;
args->exit = 0;
err = pthread_setspecific( buffer_key, (void *)args );
if ( err ) {
LogError("[%lu] pthread_setspecific() error in %s line %d: %s\n",
(long unsigned)args->tid, __FILE__, __LINE__, strerror(errno) );
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
}
snprintf(pcap_dumpfile, MAXPATHLEN-1, "%s/%s.%lu", pcap_datadir , PCAP_DUMPFILE, (unsigned long)getpid() );
pcapfile = OpenNewPcapFile(pcap_dev->handle, pcap_dumpfile, pcapfile);
if ( !pcapfile ) {
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
/* NOTREACHED */
}
// wait for alternate buffer to be ready to flush
while ( 1 ) {
pthread_mutex_lock(&pcapfile->m_pbuff);
while ( pcapfile->alternate_size == 0 && !args->done ) {
pthread_cond_wait(&pcapfile->c_pbuff, &pcapfile->m_pbuff);
}
dbg_printf("Flush cycle\n");
runs++;
// try to flush alternate buffer
if ( pcapfile->alternate_size ) {
// flush alternate buffer
dbg_printf("Flush alternate\n");
if ( write(pcapfile->pfd, (void *)pcapfile->alternate_buffer, pcapfile->alternate_size) <= 0 ) {
LogError("write() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
}
pcapfile->alternate_size = 0;
}
// if we are done, try to flsuh main data buffer
if ( args->done && pcapfile->data_size ) {
dbg_printf("Done: Flush all buffers\n");
// flush alternate buffer
if ( write(pcapfile->pfd, (void *)pcapfile->data_buffer, pcapfile->data_size) <= 0 ) {
LogError("write() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
}
pcapfile->data_size = 0;
pcapfile->data_ptr = pcapfile->data_buffer;
}
// check if we need to rotate/close the file
if ( args->done || pcapfile->t_CloseRename ) { /* rotate file */
struct tm *when;
char FullName[MAXPATHLEN];
char pcapFname[128];
char error[256];
char *subdir;
int err;
dbg_printf("Flush rotate file\n");
when = localtime(&pcapfile->t_CloseRename);
pcapfile->t_CloseRename = 0;
// prepare sub dir hierarchy
if ( args->subdir_index ) {
subdir = GetSubDir(when);
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(pcapFname, 127, "pcapd.%i%02i%02i%02i%02i",
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
} else {
snprintf(pcapFname, 127, "%s/pcapd.%i%02i%02i%02i%02i", subdir,
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
}
} else {
subdir = NULL;
snprintf(pcapFname, 127, "pcapd.%i%02i%02i%02i%02i",
when->tm_year + 1900, when->tm_mon + 1, when->tm_mday, when->tm_hour, when->tm_min);
}
pcapFname[127] = '\0';
if ( subdir && !SetupSubDir(pcap_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("p_packet_thread() Failed to create sub hier directories: %s", error );
}
// prepare full filename
snprintf(FullName, MAXPATHLEN-1, "%s/%s", pcap_datadir, pcapFname);
FullName[MAXPATHLEN-1] = '\0';
ClosePcapFile(pcapfile);
err = rename(pcap_dumpfile, FullName);
if (err) {
LogError("rename() pcap failed in %s line %d: %s", __FILE__, __LINE__, strerror(errno) );
}
dbg_printf("Rotate file: %s -> %s\n", pcap_dumpfile, FullName);
if ( args->done ) {
pthread_mutex_unlock(&pcapfile->m_pbuff);
pthread_cond_signal(&pcapfile->c_pbuff);
break;
}
// open new files
pcapfile = OpenNewPcapFile(pcap_dev->handle, pcap_dumpfile, pcapfile);
if (!pcapfile) {
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_mutex_unlock(&pcapfile->m_pbuff);
pthread_cond_signal(&pcapfile->c_pbuff);
break;
}
}
dbg_printf("Flush cycle done\n");
pthread_mutex_unlock(&pcapfile->m_pbuff);
pthread_cond_signal(&pcapfile->c_pbuff);
}
dbg_printf("End flush thread[%lu]: %i runs\n", (long unsigned)args->tid, runs);
pthread_exit((void *)args);
/* NOTREACHED */
} // End of p_pcap_flush_thread
__attribute__((noreturn)) static void *p_packet_thread(void *thread_data) {
// argument dispatching
p_packet_thread_args_t *args = (p_packet_thread_args_t *)thread_data;
pcap_dev_t *pcap_dev = args->pcap_dev;
time_t t_win = args->t_win;
char *pcap_datadir = args->pcap_datadir;
int subdir_index = args->subdir_index;
int live = args->live;
// locals
p_pcap_flush_thread_args_t p_flush_thread_args;
pcapfile_t *pcapfile;
time_t t_start;
int err;
dbg_printf("New packet thread[%lu]\n", (long unsigned)args->tid);
args->done = 0;
args->exit = 0;
err = pthread_setspecific( buffer_key, (void *)args );
if ( err ) {
LogError("[%lu] pthread_setspecific() error in %s line %d: %s\n",
(long unsigned)args->tid, __FILE__, __LINE__, strerror(errno) );
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
/* NOTREACHED */
}
/* start flush and pcap file handler thread */
if ( pcap_datadir ) {
// just allocate pcapfile and buffers - we need to share pcapfile
pcapfile = OpenNewPcapFile(pcap_dev->handle, NULL, NULL);
if ( !pcapfile ) {
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
/* NOTREACHED */
}
p_flush_thread_args.done = 0;
p_flush_thread_args.exit = 0;
p_flush_thread_args.parent = args->tid;
p_flush_thread_args.pcap_dev = args->pcap_dev;
p_flush_thread_args.subdir_index = subdir_index;
p_flush_thread_args.pcap_datadir = pcap_datadir;
p_flush_thread_args.pcapfile = pcapfile;
err = pthread_create(&p_flush_thread_args.tid, NULL, p_pcap_flush_thread, (void *)&p_flush_thread_args);
if ( err ) {
LogError("pthread_create() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
args->done = 1;
args->exit = 255;
pthread_kill(args->parent, SIGUSR1);
pthread_exit((void *)args);
}
dbg_printf("Started flush thread[%lu]\n", (long unsigned)p_flush_thread_args.tid);
} else {
pcapfile = NULL;
}
err = 0;
t_start = 0;
while ( 1 ) {
struct pcap_pkthdr *hdr;
const u_char *data;
struct timeval tv;
time_t t_clock;
int ret;
if ( !args->done ) {
ret = pcap_next_ex(pcap_dev->handle, &hdr, &data);
t_clock = 0;
switch (ret) {
case 1: {
// packet read ok
t_clock = hdr->ts.tv_sec;
// process packet for flow cache
ProcessPacket(args->NodeList, pcap_dev, hdr, data);
if ( pcap_datadir ) {
// keep the packet
if (((t_clock - t_start) >= t_win)) {
// first packet or rotate file
if ( t_start != 0 ) {
RotateFile(pcapfile, t_start, live);
}
// if first packet - set t_start here
t_start = t_clock - (t_clock % t_win);
}
PcapDump(pcapfile, hdr, data);
}
} break;
case 0: {
// live capture idle cycle
dbg_printf("pcap_next_ex() read live - timeout\n");
gettimeofday(&tv, NULL);
t_clock = tv.tv_sec;
if ((t_clock - t_start) >= t_win) { /* rotate file */
if ( t_start ) {
// if not first packet, where t_start = 0
struct FlowNode *Node = New_Node();
Node->t_first = tv;
Node->t_last = tv;
Node->fin = SIGNAL_NODE;
Push_Node(args->NodeList, Node);
if ( pcap_datadir )
// keep the packet
RotateFile(pcapfile, t_start, live);
LogInfo("Packet processing stats: Total: %u, Skipped: %u, Unknown: %u, Short snaplen: %u",
pcap_dev->proc_stat.packets, pcap_dev->proc_stat.skipped,
pcap_dev->proc_stat.unknown, pcap_dev->proc_stat.short_snap);
}
t_start = t_clock - (t_clock % t_win);
memset((void *)&(pcap_dev->proc_stat), 0, sizeof(proc_stat_t));
}
} break;
case -1:
// signal error reading the packet
err = 1;
LogError("pcap_next_ex() read error: '%s'", pcap_geterr(pcap_dev->handle));
args->done = 1;
continue;
break;
case -2: // End of packet file
// signal parent, job is done
err = 1;
LogInfo("pcap_next_ex() end of file");
args->done = 1;
LogInfo("Packet processing stats: Total: %u, Skipped: %u, Unknown: %u, Short snaplen: %u",
pcap_dev->proc_stat.packets, pcap_dev->proc_stat.skipped,
pcap_dev->proc_stat.unknown, pcap_dev->proc_stat.short_snap);
continue;
break;
default:
err = 1;
pcap_breakloop(pcap_dev->handle);
LogError("Unexpected pcap_next_ex() return value: %i", ret);
args->done = 1;
continue;
}
}
if ( args->done )
break;
}
if ( pcap_datadir ) {
dbg_printf("Wait for flush thread to complete\n");
pthread_mutex_lock(&pcapfile->m_pbuff);
while ( pcapfile->alternate_size ) {
pthread_cond_wait(&pcapfile->c_pbuff, &pcapfile->m_pbuff);
}
pcapfile->t_CloseRename = t_start;
pthread_mutex_unlock(&pcapfile->m_pbuff);
dbg_printf("Wait done.\n");
LogInfo("Signal flush thread[%lu] to terminate", p_flush_thread_args.tid);
SignalThreadTerminate((thread_info_t *)&p_flush_thread_args, &pcapfile->c_pbuff);
}
if ( err )
pthread_kill(args->parent, SIGUSR1);
LogInfo("Packet processing stats: Total: %u, Skipped: %u, Unknown: %u, Short snaplen: %u",
pcap_dev->proc_stat.packets, pcap_dev->proc_stat.skipped,
pcap_dev->proc_stat.unknown, pcap_dev->proc_stat.short_snap);
LogInfo("Terminating packet dumping: exit: %i", args->exit);
dbg_printf("End packet thread[%lu]\n", (long unsigned)args->tid);
pthread_exit((void *)args);
/* NOTREACHED */
} /* End of p_packet_thread */
static void WaitDone(void) {
sigset_t signal_set;
int done, sig;
pthread_t tid = pthread_self();
LogInfo("[%lu] WaitDone() waiting", (long unsigned)tid);
sigemptyset(&signal_set);
sigaddset(&signal_set, SIGINT);
sigaddset(&signal_set, SIGHUP);
sigaddset(&signal_set, SIGTERM);
sigaddset(&signal_set, SIGUSR1);
pthread_sigmask(SIG_BLOCK, &signal_set, NULL);
done = 0;
while ( !done ) {
sigwait(&signal_set, &sig);
LogInfo("[%lu] WaitDone() signal %i", (long unsigned)tid, sig);
switch ( sig ) {
case SIGHUP:
break;
case SIGINT:
case SIGTERM:
pthread_mutex_lock(&m_done);
done = 1;
pthread_mutex_unlock(&m_done);
pthread_cond_signal(&terminate);
break;
case SIGUSR1:
// child signals end of job
done = 1;
break;
// default:
// empty
}
}
} // End of WaitDone
int main(int argc, char *argv[]) {
sigset_t signal_set;
struct sigaction sa;
int c, snaplen, err, do_daemonize;
int subdir_index, compress, expire, cache_size;
FlowSource_t *fs;
dirstat_t *dirstat;
time_t t_win;
char *device, *pcapfile, *filter, *datadir, *pcap_datadir, *extension_tags, pidfile[MAXPATHLEN], pidstr[32];
char *Ident, *userid, *groupid;
pcap_dev_t *pcap_dev;
p_packet_thread_args_t *p_packet_thread_args;
p_flow_thread_args_t *p_flow_thread_args;
snaplen = 100;
do_daemonize = 0;
launcher_pid = 0;
device = NULL;
pcapfile = NULL;
filter = NULL;
pidfile[0] = '\0';
t_win = TIME_WINDOW;
datadir = DEFAULT_DIR;
pcap_datadir = NULL;
userid = groupid = NULL;
Ident = "none";
fs = NULL;
extension_tags = DefaultExtensions;
subdir_index = 0;
compress = 0;
verbose = 0;
expire = 0;
cache_size = 0;
while ((c = getopt(argc, argv, "B:DEI:g:hi:r:s:l:p:P:t:u:S:T:e:Vz")) != EOF) {
switch (c) {
struct stat fstat;
case 'h':
usage(argv[0]);
exit(0);
break;
case 'u':
userid = optarg;
break;
case 'g':
groupid = optarg;
break;
case 'D':
do_daemonize = 1;
break;
case 'B':
cache_size = atoi(optarg);
if (cache_size <= 0) {
LogError("ERROR: Cache size must not be < 0");
exit(EXIT_FAILURE);
}
break;
case 'I':
Ident = strdup(optarg);
break;
case 'i':
device = optarg;
break;
case 'l':
datadir = optarg;
err = stat(datadir, &fstat);
if (!(fstat.st_mode & S_IFDIR)) {
LogError("No such directory: " "'%s'", datadir);
break;
}
break;
case 'p':
pcap_datadir = optarg;
err = stat(pcap_datadir, &fstat);
if (!(fstat.st_mode & S_IFDIR)) {
LogError("No such directory: " "'%s'", pcap_datadir);
break;
}
break;
case 'r': {
struct stat stat_buf;
pcapfile = optarg;
if ( stat(pcapfile, &stat_buf) ) {
LogError("Can't stat '%s': %s", pcapfile, strerror(errno));
exit(EXIT_FAILURE);
}
if (!S_ISREG(stat_buf.st_mode) ) {
LogError("'%s' is not a file", pcapfile);
exit(EXIT_FAILURE);
}
} break;
case 's':
snaplen = atoi(optarg);
if (snaplen < 14 + 20 + 20) { // ethernet, IP , TCP, no payload
LogError("ERROR:, snaplen < sizeof IPv4 - Need 54 bytes for TCP/IPv4");
exit(EXIT_FAILURE);
}
break;
case 't':
t_win = atoi(optarg);
if (t_win < 60) {
LogError("WARNING, very small time frame (< 60)!");
}
if (t_win <= 0) {
LogError("ERROR: time frame too small (<= 0)");
exit(EXIT_FAILURE);
}
break;
case 'z':
compress = 1;
break;
case 'P':
if ( optarg[0] == '/' ) { // absolute path given
strncpy(pidfile, optarg, MAXPATHLEN-1);
} else { // path relative to current working directory
char tmp[MAXPATHLEN];
if ( !getcwd(tmp, MAXPATHLEN-1) ) {
fprintf(stderr, "Failed to get current working directory: %s\n", strerror(errno));
exit(255);
}
tmp[MAXPATHLEN-1] = 0;
snprintf(pidfile, MAXPATHLEN - 1 - strlen(tmp), "%s/%s", tmp, optarg);
}
// pidfile now absolute path
pidfile[MAXPATHLEN-1] = 0;
break;
case 'S':
subdir_index = atoi(optarg);
break;
case 'T': {
size_t len = strlen(optarg);
extension_tags = optarg;
if ( len == 0 || len > 128 ) {
fprintf(stderr, "Extension length error. Unexpected option '%s'\n", extension_tags);
exit(255);
}
break; }
case 'E':
verbose = 1;
Setv6Mode(1);
break;
case 'V':
printf("%s: Version: %s\n",argv[0], nfdump_version);
exit(0);
break;
default:
usage(argv[0]);
exit(EXIT_FAILURE);
}
}
if (argc - optind > 1) {
usage(argv[0]);
exit(EXIT_FAILURE);
} else {
/* user specified a pcap filter */
filter = argv[optind];
}
if ( fs == NULL && datadir != NULL && !AddDefaultFlowSource(&fs, Ident, datadir) ) {
fprintf(stderr, "Failed to add default data collector directory\n");
exit(255);
}
if ( device && pcapfile ) {
LogError("Specify either a device or a pcapfile, but not both");
exit(EXIT_FAILURE);
}
if ( !device && !pcapfile ) {
LogError("Specify either a device or a pcapfile to read packets from");
exit(EXIT_FAILURE);
}
if ( !Init_FlowTree(cache_size)) {
LogError("Init_FlowTree() failed.");
exit(EXIT_FAILURE);
}
InitExtensionMaps(NO_EXTENSION_LIST);
SetupExtensionDescriptors(strdup(extension_tags));
if ( pcapfile ) {
pcap_dev = setup_pcap_file(pcapfile, filter, snaplen);
} else {
pcap_dev = setup_pcap_live(device, filter, snaplen);
}
if (!pcap_dev) {
exit(EXIT_FAILURE);
}
SetPriv(userid, groupid);
if ( subdir_index && !InitHierPath(subdir_index) ) {
pcap_close(pcap_dev->handle);
exit(255);
}
if ( do_daemonize && !InitLog(argv[0], SYSLOG_FACILITY)) {
pcap_close(pcap_dev->handle);
exit(255);
}
// check if pid file exists and if so, if a process with registered pid is running
if ( strlen(pidfile) ) {
int pidf;
pidf = open(pidfile, O_RDONLY, 0);
if ( pidf > 0 ) {
// pid file exists
char s[32];
ssize_t len;
len = read(pidf, (void *)s, 31);
close(pidf);
s[31] = '\0';
if ( len < 0 ) {
fprintf(stderr, "read() error existing pid file: %s\n", strerror(errno));
pcap_close(pcap_dev->handle);
exit(255);
} else {
unsigned long pid = atol(s);
if ( pid == 0 ) {
// garbage - use this file
unlink(pidfile);
} else {
if ( kill(pid, 0) == 0 ) {
// process exists
fprintf(stderr, "A process with pid %lu registered in pidfile %s is already running!\n",
pid, strerror(errno));
pcap_close(pcap_dev->handle);
exit(255);
} else {
// no such process - use this file
unlink(pidfile);
}
}
}
} else {
if ( errno != ENOENT ) {
fprintf(stderr, "open() error existing pid file: %s\n", strerror(errno));
pcap_close(pcap_dev->handle);
exit(255);
} // else errno == ENOENT - no file - this is fine
}
}
if ( do_daemonize ) {
verbose = 0;
daemonize();
}
if (strlen(pidfile)) {
pid_t pid = getpid();
int pidf = open(pidfile, O_RDWR|O_TRUNC|O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if ( pidf == -1 ) {
LogError("Error opening pid file: '%s' %s", pidfile, strerror(errno));
pcap_close(pcap_dev->handle);
exit(255);
}
snprintf(pidstr,31,"%lu\n", (unsigned long)pid);
if ( write(pidf, pidstr, strlen(pidstr)) <= 0 ) {
LogError("Error write pid file: '%s' %s", pidfile, strerror(errno));
}
close(pidf);
}
if ( InitBookkeeper(&fs->bookkeeper, fs->datadir, getpid(), launcher_pid) != BOOKKEEPER_OK ) {
LogError("initialize bookkeeper failed.");
pcap_close(pcap_dev->handle);
exit(255);
}
// Init the extension map list
if ( !InitExtensionMapList(fs) ) {
// error message goes to syslog
pcap_close(pcap_dev->handle);
exit(255);
}
IPFragTree_init();
LogInfo("Startup.");
// prepare signal mask for all threads
// block signals, as they are handled by the main thread
// mask is inherited by all threads
sigemptyset(&signal_set);
sigaddset(&signal_set, SIGINT);
sigaddset(&signal_set, SIGHUP);
sigaddset(&signal_set, SIGTERM);
sigaddset(&signal_set, SIGUSR1);
sigaddset(&signal_set, SIGPIPE);
pthread_sigmask(SIG_BLOCK, &signal_set, NULL);
// for USR2 set a signal handler, which interrupts blocking
// system calls - and signals done event
// handler applies for all threads in a process
sa.sa_handler = Interrupt_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGPIPE, &sa, NULL);
sigaction(SIGUSR2, &sa, NULL);
// key for each thread
err = pthread_key_create(&buffer_key, NULL);
if ( err ) {
LogError("pthread_key() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
exit(255);
}
// prepare flow thread args
p_flow_thread_args = (p_flow_thread_args_t *)malloc(sizeof(p_flow_thread_args_t));
if ( !p_flow_thread_args ) {
LogError("malloc() error in %s line %d: %s\n",
__FILE__, __LINE__, strerror(errno) );
exit(255);
}
p_flow_thread_args->fs = fs;
p_flow_thread_args->t_win = t_win;
p_flow_thread_args->compress = compress;
p_flow_thread_args->subdir_index = subdir_index;
p_flow_thread_args->parent = pthread_self();
p_flow_thread_args->NodeList = NewNodeList();
err = 0;
err = pthread_create(&p_flow_thread_args->tid, NULL, p_flow_thread, (void *)p_flow_thread_args);
if ( err ) {
LogError("pthread_create() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
exit(255);
}
dbg_printf("Started flow thread[%lu]\n", (long unsigned)p_flow_thread_args->tid);
// prepare packet thread args
p_packet_thread_args = (p_packet_thread_args_t *)malloc(sizeof(p_packet_thread_args_t));
if ( !p_packet_thread_args ) {
LogError("malloc() error in %s line %d: %s\n",
__FILE__, __LINE__, strerror(errno) );
exit(255);
}
p_packet_thread_args->pcap_dev = pcap_dev;
p_packet_thread_args->t_win = t_win;
p_packet_thread_args->subdir_index = subdir_index;
p_packet_thread_args->pcap_datadir = pcap_datadir;
p_packet_thread_args->live = device != NULL;
p_packet_thread_args->parent = pthread_self();
p_packet_thread_args->NodeList = p_flow_thread_args->NodeList;
err = pthread_create(&p_packet_thread_args->tid, NULL, p_packet_thread, (void *)p_packet_thread_args);
if ( err ) {
LogError("pthread_create() error in %s line %d: %s\n", __FILE__, __LINE__, strerror(errno) );
exit(255);
}
dbg_printf("Started packet thread[%lu]\n", (long unsigned)p_packet_thread_args->tid);
// Wait till done
WaitDone();
dbg_printf("Signal packet thread to terminate\n");
SignalThreadTerminate((thread_info_t *)p_packet_thread_args, NULL);
dbg_printf("Signal flow thread to terminate\n");
SignalThreadTerminate((thread_info_t *)p_flow_thread_args, &p_packet_thread_args->NodeList->c_list);
// free arg list
free((void *)p_packet_thread_args);
free((void *)p_flow_thread_args);
LogInfo("Terminating nfpcapd.");
if ( expire == 0 && ReadStatInfo(fs->datadir, &dirstat, LOCK_IF_EXISTS) == STATFILE_OK ) {
UpdateBookStat(dirstat, fs->bookkeeper);
WriteStatInfo(dirstat);
LogInfo("Updating statinfo in directory '%s'", datadir);
}
ReleaseBookkeeper(fs->bookkeeper, DESTROY_BOOKKEEPER);
pcap_close(pcap_dev->handle);
if ( strlen(pidfile) )
unlink(pidfile);
EndLog();
exit(EXIT_SUCCESS);
} /* End of main */
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