要對(duì)某個(gè)端口監(jiān)視端口流量，有不想在程序了動(dòng)手術(shù)，唯有用pcap開刀，簡(jiǎn)單寫個(gè)pcap的程序

監(jiān)控端口和端口+1兩個(gè)端口的連接實(shí)時(shí)流量。下面的程序直接可以編譯。

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
#include <signal.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <sys/utsname.h>
#include <linux/sockios.h>
#include <sys/resource.h>
#include <pcap.h>
#include <pthread.h>
#include <ncurses.h>


/* hack, so we may include kernel's ethtool.h */
typedef unsigned long long __u64;
typedef __uint32_t __u32;
typedef __uint16_t __u16;
typedef __uint8_t __u8;

/* historical: we used to use kernel-like types; remove these once cleaned */
typedef unsigned long long u64;
typedef __uint32_t u32;
typedef __uint16_t u16;
typedef __uint8_t u8;

typedef __uint32_t u_int32_t;
typedef __uint16_t u_int16_t;
typedef __uint8_t u_int8_t;

/* ethernet header define from ether.h*/
#define ETHERTYPE_PUP 0x0200
#define ETHERTYPE_IP 0x0800
#define ETHERTYPE_ARP 0x0806
#define ETHERTYPE_REVARP 0x8035
#define ETHER_ADDR_LEN 6

struct ether_header {
u_int8_t ether_dhost[ETHER_ADDR_LEN];
u_int8_t ether_shost[ETHER_ADDR_LEN];
u_int16_t ether_type;
};

struct vlan_8021q_header {
u_int16_t priority_cfi_vid;
u_int16_t ether_type;
};

/*
* Definitions for internet protocol version 4.
* Per RFC 791, September 1981.
*/
#define IPVERSION 4

/*
* Structure of an internet header, naked of options.
*
* We declare ip_len and ip_off to be short, rather than u_short
* pragmatically since otherwise unsigned comparisons can result
* against negative integers quite easily, and fail in subtle ways.
*/
struct ip {
u_int8_t ip_vhl; /* header length, version */
#define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4)
#define IP_HL(ip) ((ip)->ip_vhl & 0x0f)
u_int8_t ip_tos; /* type of service */
u_int16_t ip_len; /* total length */
u_int16_t ip_id; /* identification */
u_int16_t ip_off; /* fragment offset field */
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
u_int8_t ip_ttl; /* time to live */
u_int8_t ip_p; /* protocol */
u_int16_t ip_sum; /* checksum */
struct in_addr ip_src,ip_dst; /* source and dest address */
};

#define IP_MAXPACKET 65535 /* maximum packet size */

/*
* Definitions for IP type of service (ip_tos)
*/
#define IPTOS_LOWDELAY 0x10
#define IPTOS_THROUGHPUT 0x08
#define IPTOS_RELIABILITY 0x04

/*
* Definitions for IP precedence (also in ip_tos) (hopefully unused)
*/
#define IPTOS_PREC_NETCONTROL 0xe0
#define IPTOS_PREC_INTERNETCONTROL 0xc0
#define IPTOS_PREC_CRITIC_ECP 0xa0
#define IPTOS_PREC_FLASHOVERRIDE 0x80
#define IPTOS_PREC_FLASH 0x60
#define IPTOS_PREC_IMMEDIATE 0x40
#define IPTOS_PREC_PRIORITY 0x20
#define IPTOS_PREC_ROUTINE 0x00

/*
* Definitions for options.
*/
#define IPOPT_COPIED(o) ((o)&0x80)
#define IPOPT_CLASS(o) ((o)&0x60)
#define IPOPT_NUMBER(o) ((o)&0x1f)

#define IPOPT_CONTROL 0x00
#define IPOPT_RESERVED1 0x20
#define IPOPT_DEBMEAS 0x40
#define IPOPT_RESERVED2 0x60

#define IPOPT_EOL 0 /* end of option list */
#define IPOPT_NOP 1 /* no operation */
#define IPOPT_RR 7 /* record packet route */
#define IPOPT_TS 68 /* timestamp */
#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
#define IPOPT_LSRR 131 /* loose source route */
#define IPOPT_SATID 136 /* satnet id */
#define IPOPT_SSRR 137 /* strict source route */

/*
* Offsets to fields in options other than EOL and NOP.
*/
#define IPOPT_OPTVAL 0 /* option ID */
#define IPOPT_OLEN 1 /* option length */
#define IPOPT_OFFSET 2 /* offset within option */
#define IPOPT_MINOFF 4 /* min value of above */

/*
* Time stamp option structure.
*/
struct ip_timestamp {
u_int8_t ipt_code; /* IPOPT_TS */
u_int8_t ipt_len; /* size of structure (variable) */
u_int8_t ipt_ptr; /* index of current entry */
u_int8_t ipt_oflwflg; /* flags, overflow counter */
#define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
#define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
union ipt_timestamp {
u_int32_t ipt_time[1];
struct ipt_ta {
struct in_addr ipt_addr;
u_int32_t ipt_time;
} ipt_ta[1];
} ipt_timestamp;
};

/* flag bits for ipt_flg */
#define IPOPT_TS_TSONLY 0 /* timestamps only */
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 3 /* specified modules only */

/* bits for security (not byte swapped) */
#define IPOPT_SECUR_UNCLASS 0x0000
#define IPOPT_SECUR_CONFID 0xf135
#define IPOPT_SECUR_EFTO 0x789a
#define IPOPT_SECUR_MMMM 0xbc4d
#define IPOPT_SECUR_RESTR 0xaf13
#define IPOPT_SECUR_SECRET 0xd788
#define IPOPT_SECUR_TOPSECRET 0x6bc5

/*
* Internet implementation parameters.
*/
#define MAXTTL 255 /* maximum time to live (seconds) */
#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
#define IPFRAGTTL 60 /* time to live for frags, slowhz */
#define IPTTLDEC 1 /* subtracted when forwarding */
#define IP_MSS 576 /* default maximum segment size */
/*
* @(#)tcp.h 8.1 (Berkeley) 6/10/93
*/
typedef u_int32_t tcp_seq;

/*
* TCP header.
* Per RFC 793, September, 1981.
*/
struct tcphdr {
u_int16_t th_sport; /* source port */
u_int16_t th_dport; /* destination port */
tcp_seq th_seq; /* sequence number */
tcp_seq th_ack; /* acknowledgement number */
u_int8_t th_offx2; /* data offset, rsvd */
#define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4)
u_int8_t th_flags;
#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECNECHO 0x40 /* ECN Echo */
#define TH_CWR 0x80 /* ECN Cwnd Reduced */
u_int16_t th_win; /* window */
u_int16_t th_sum; /* checksum */
u_int16_t th_urp; /* urgent pointer */
};

#define TCPOPT_EOL 0
#define TCPOPT_NOP 1
#define TCPOPT_MAXSEG 2
#define TCPOLEN_MAXSEG 4
#define TCPOPT_WSCALE 3 /* window scale factor (rfc1323) */
#define TCPOPT_SACKOK 4 /* selective ack ok (rfc2018) */
#define TCPOPT_SACK 5 /* selective ack (rfc2018) */
#define TCPOPT_ECHO 6 /* echo (rfc1072) */
#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
#define TCPOPT_TIMESTAMP 8 /* timestamp (rfc1323) */
#define TCPOLEN_TIMESTAMP 10
#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
#define TCPOPT_TSTAMP_HDR /
(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)



struct if_stats
{
char devname[10];
unsigned long long rx_packets;
unsigned long long tx_packets;
unsigned long long rx_bytes;
unsigned long long tx_bytes;
unsigned long long rx_errors;
unsigned long long tx_errors;
unsigned long long rx_dropped;
unsigned long long tx_dropped;
unsigned long long rx_fifo;
unsigned long long tx_fifo;
unsigned long long rx_frame;
unsigned long long tx_colls;
unsigned long long rx_multicast;
unsigned long long tx_carrier;
unsigned long long rx_compressed;
unsigned long long tx_compressed;
unsigned int link;
struct if_stats* next;
};

struct iface_dev
{
char name[16];
struct in_addr ip;
struct in_addr netmask;
unsigned int link;
struct iface_dev* next;
};

/* This should work for both 32 and 64 bit userland. */
struct ethtool_cmd
{
__u32 cmd;
__u32 supported; /* Features this interface supports */
__u32 advertising;/* Features this interface advertises */
__u16 speed; /* The forced speed, 10Mb, 100Mb, gigabit */
__u8 duplex; /* Duplex, half or full */
__u8 port; /* Which connector port */
__u8 phy_address;
__u8 transceiver;/* Which transceiver to use */
__u8 autoneg; /* Enable or disable autonegotiation */
__u32 maxtxpkt; /* Tx pkts before generating tx int */
__u32 maxrxpkt; /* Rx pkts before generating rx int */
__u32 reserved[4];
};

/* for passing single values */
struct ethtool_value
{
__u32 cmd;
__u32 data;
};

union iaddr
{
unsigned u;
unsigned char b[4];
};

struct tcp_stat
{
//unsigned int ip;
struct in_addr ip;
unsigned short int port;
unsigned short int dport;
unsigned long long recv_bytes;
unsigned long long sent_bytes;
unsigned long long total_sent;
unsigned long long total_recv;

unsigned long long pre_recv_bytes;
unsigned long long pre_sent_bytes;
unsigned long long pre_total_sent;
unsigned long long pre_total_recv;
time_t start_time;
struct tcp_stat* next;
};

struct vstate
{
struct iface_dev st_ndev;
struct tcp_stat st_tcp;
};

int running = 1;
int options = 0;
uid_t vsuid = 0;
pid_t vspid = 0;
int vsport = 0;
int intetval = 3;
char vsbuf[2046];
char head_line[1024];
char vsdev[10];
char *vsline = vsbuf;
struct vstate vst;
FILE* logfile = NULL;
char* app_name;

/* pcap descriptor */
pcap_t* pd = 0;
pcap_handler packet_handler;
#define CAPTURE_LENGTH 72

/* ethernet address of interface. */
int have_hw_addr = 1;
unsigned char if_hw_addr[6];

/* IP address of interface */
int have_ip_addr = 0;
struct in_addr if_ip_addr;

/* ethernet address of gateway. */
int have_gw_addr = 1;
struct in_addr if_gw_addr;

int get_addrs_ioctl(char *interface, unsigned char* if_hw_addr, struct in_addr *if_ip_addr)
{
struct ifreq ifr = {};
int got_hw_addr = 0;
int got_ip_addr = 0;

int s = socket(PF_INET, SOCK_DGRAM, 0); /* any sort of IP socket will do */
if (s == -1) {
printf("create a socket error/n");
return -1;
}

memset(if_hw_addr, 0, 6);
strncpy(ifr.ifr_name, interface, IFNAMSIZ);

if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0) {
printf( "Error getting hardware address for interface: %s/n", interface);
}
else {
memcpy(if_hw_addr, ifr.ifr_hwaddr.sa_data, 6);
got_hw_addr = 1;
}

/* Get the IP address of the interface */
(*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = AF_INET;
if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
printf( "Unable to get IP address for interface: %s/n", interface);
}
else {
memcpy(if_ip_addr, &((*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr), sizeof(struct in_addr));
got_ip_addr = 2;
}

close(s);
return got_hw_addr + got_ip_addr;
}

int get_gateway_addr(const char *dev)
{
char ifname[64];
in_addr_t dest, gway, mask;
int flags, refcnt, use, metric, mtu, win, irtt;
FILE *fp;
if_gw_addr.s_addr = 0;

fp = fopen("/proc/net/route", "r");
if (fp == NULL)
return -1;

/* Skip the header line */
if (fscanf(fp, "%*[^/n]/n") < 0) {
fclose(fp);
return -1;
}

while(1){
int nread = fscanf(fp, "%63s%X%X%X%d%d%d%X%d%d%d/n",
ifname, &dest, &gway, &flags, &refcnt, &use, &metric, &mask,
&mtu, &win, &irtt);
if (nread != 11)
break;

if(strcmp(ifname, dev) == 0 && gway){
if_gw_addr.s_addr = gway;
printf("%s gateway %s/n",dev,inet_ntoa(if_gw_addr));
break;
}
}

fclose(fp);
return 0;
}



int ip_addr_match(struct in_addr addr) {
return addr.s_addr == if_ip_addr.s_addr;
}

struct tcp_stat* get_tcp_stat(struct in_addr* ip,unsigned short int port,unsigned short int dport)
{
struct tcp_stat *st_tcp = &vst.st_tcp;
static struct tcp_stat *st_tcp_end = &vst.st_tcp;

while (st_tcp){
if(st_tcp->ip.s_addr == ip->s_addr && st_tcp->port == port)
return st_tcp;
else
st_tcp = st_tcp->next;
}

struct tcp_stat *st_new = 0;
st_new = malloc(sizeof(struct tcp_stat));
memset(st_new,0,sizeof(struct tcp_stat));
st_new->start_time = time(0);
st_new->ip = *ip;
st_new->port = port;
st_new->dport = dport;

st_tcp_end->next = st_new;
st_tcp_end = st_new;
return st_new;
}

inline struct tcp_stat* get_tcp_stat_head(struct in_addr* ip,unsigned short int port)
{
struct tcp_stat *st_tcp = &vst.st_tcp;
return st_tcp;
}

void calculate_tcp_rate(struct tcp_stat *tcp_stats)
{
int row = 1;
int nport1 = 0, nport2=0;
double rx_bytes,tx_bytes;
double rx_tbytes,tx_tbytes;
double rx_port1 = 0,tx_port1 = 0;
double rx_port2 = 0,tx_port2 = 0;
double rx_tport1 = 0,tx_tport1 = 0;
double rx_tport2 = 0,tx_tport2 = 0;

struct tcp_stat *st_tcp = NULL;
st_tcp = tcp_stats->next ? tcp_stats->next : NULL;

mvprintw(0,1,head_line);

while (st_tcp){
rx_bytes = st_tcp->recv_bytes - st_tcp->pre_recv_bytes;
tx_bytes = st_tcp->sent_bytes - st_tcp->pre_sent_bytes;

rx_bytes /= (1024*intetval);
tx_bytes /= (1024*intetval);

st_tcp->pre_recv_bytes = st_tcp->recv_bytes;
st_tcp->pre_sent_bytes = st_tcp->sent_bytes;

rx_tbytes = st_tcp->total_recv/1024;
tx_tbytes = st_tcp->total_sent/1024;
time_t period = time(0) - st_tcp->start_time;

if(st_tcp->port == vsport+1 || st_tcp->dport == vsport+1){
rx_port2 += rx_bytes;
tx_port2 += tx_bytes;
rx_tport2 += rx_tbytes;
tx_tport2 += tx_tbytes;
nport2++;
}else{
rx_port1 += rx_bytes;
tx_port1 += tx_bytes;
rx_tport1 += rx_tbytes;
tx_tport1 += tx_tbytes;
nport1++;
}

char c = ' ';
if(st_tcp->port== vsport+1 || st_tcp->dport== vsport+1)
c = 'B';
else
c = 'F';

mvprintw(row,1,"%c %3d %15s :%5d %8.1fk %8.1fk %9.1fM %9.1fM %9.1fk %9.1fk",
c,
row,
inet_ntoa(st_tcp->ip),st_tcp->port,
rx_bytes,tx_bytes,rx_tbytes/1024,tx_tbytes/1024,
rx_tbytes/period,tx_tbytes/period);
row++;
st_tcp = st_tcp->next;
}

//mvprintw(row++,1,"--------------------------------------------------------------------------------------------");
mvprintw(row++,1," ");
mvprintw(row++,1," ALL %15s :%5d %8.1fk %8.1fk %9.1fM %9.1fM","PORT ", vsport,
rx_port1,tx_port1,rx_tport1/1024,tx_tport1/1024);

mvprintw(row++,1," ALL %15s :%5d %8.1fk %8.1fk %9.1fM %9.1fM","PORT ", vsport+1,
rx_port2,tx_port2,rx_tport2/1024,tx_tport2/1024);
refresh();
}

void handle_ip_packet(struct ip* iptr, int hw_dir)
{
int len;
struct tcp_stat *st,*sa;
//unsigned int ip = 0;
struct in_addr ip;
unsigned short int port = 0;
unsigned short int dport = 0;

/* Does this protocol use ports? */
if(iptr->ip_p != IPPROTO_TCP)
return;

/* We take a slight liberty here by treating UDP the same as TCP */
/* Find the TCP/UDP header */
struct tcphdr* thdr = ((void*)iptr) + IP_HL(iptr) * 4;

if(hw_dir == 0) {
/* Packet incoming this interface. */
ip = iptr->ip_src;
port = ntohs(thdr->th_sport);
dport= ntohs(thdr->th_dport);
if(ip.s_addr == if_gw_addr.s_addr)
return;
}
else if(hw_dir == 1) {
/* Packet leaving*/
ip = iptr->ip_dst;
port = ntohs(thdr->th_dport);
dport= ntohs(thdr->th_sport);
if(ip.s_addr == if_gw_addr.s_addr)
return;
}

/* Add the addresses to be resolved */
st = get_tcp_stat(&ip,port,dport);
sa = get_tcp_stat_head(&ip,port);

len = ntohs(iptr->ip_len);
if(st == NULL)
return;

//printf("%s:%d len %d/n",inet_ntoa(ip),port,len);
/* Update record */
if(hw_dir) {
st->sent_bytes += len; /*leaving*/
st->total_sent += len;
sa->total_sent += len;
}
else {
st->recv_bytes += len; /*entering*/
st->total_recv += len;
sa->total_recv += len;
}
}

void handle_eth_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
struct ether_header *eptr;
int ether_type;
const unsigned char *payload;
eptr = (struct ether_header*)packet;
ether_type = ntohs(eptr->ether_type);
payload = packet + sizeof(struct ether_header);

if(ether_type == ETHERTYPE_IP) {
struct ip* iptr;
int dir = -1;

/*
* Is a direction implied by the MAC addresses?
*/
if(have_hw_addr && memcmp(eptr->ether_shost, if_hw_addr, 6) == 0 ) {
/* packet leaving this i/f */
dir = 1;
}
else if(have_hw_addr && memcmp(eptr->ether_dhost, if_hw_addr, 6) == 0 ) {
/* packet entering this i/f */
dir = 0;
}
else if (memcmp("/xFF/xFF/xFF/xFF/xFF/xFF", eptr->ether_dhost, 6) == 0) {
/* broadcast packet, count as incoming */
dir = 0;
}

iptr = (struct ip*)(payload); /* alignment? */
handle_ip_packet(iptr, dir);
}
else if (ether_type == ETHERTYPE_ARP)
{
/*printf ("Ethernet type hex:%x dec:%d is an ARP packet/n");*/
}
else{
/*printf ("Ethernet type %x not IP/n");*/
}
}

/*
* packet_init: performs pcap initialisation, called before ui is initialised
*/
int packet_init(char* dev)
{
int result = -1;
int promisc = 0; /* set to promisc mode?*/
char errbuf[PCAP_ERRBUF_SIZE];

/* get network card interface*/
have_hw_addr = 1;
result = get_addrs_ioctl(dev, if_hw_addr, &if_ip_addr);
if (result < 0)
return -1;

/* get interface gateway address*/
result = get_gateway_addr(dev);
if (result < 0)
return -1;

/* open interface with pcap*/
pd = pcap_open_live(dev, CAPTURE_LENGTH, promisc, 1000, errbuf);
if(pd == NULL) {
printf("pcap_open_live(%s): %s/n", dev, errbuf);
return -1;
}

/* set callback handle function*/
packet_handler = handle_eth_packet;

sprintf(head_line,"%s %15s %5s %7s %7s %7s %7s %7s %7s/n",
"# ###"," dstination ip","port"," recv(k/s)","sent(k/s)","recv total","sent total","in avg(k/s)","out avg(k/s)/n");
/*"# ###","dst ip port - port","recv(k/s)","sent(k/s)","recv total","sent total","in avg(k/s)","out avg(k/s)/n");*/
return 0;
}

int packet_filter(char* dev,int port)
{
struct bpf_program* fp; /* The compiled filter expression */
char filter_exp[20] = "port 13948";/* The filter expression */
bpf_u_int32 mask; /* The netmask of our sniffing device */
bpf_u_int32 net; /* The IP of our sniffing device */
char errbuf[PCAP_ERRBUF_SIZE];

/* get device ip/mask*/
if (pcap_lookupnet(dev, &net, &mask, errbuf) == -1) {
printf("Can't get netmask for device %s/n", dev);
net = 0;
mask = 0;
return -1;
}

/* compile filter exp*/
sprintf(filter_exp,"portrange %d-%d",port,port+1);
fp = malloc(sizeof(struct bpf_program));
if (pcap_compile(pd, fp, filter_exp, 0, net) == -1) {
printf("Couldn't parse filter %s: %s/n", filter_exp, pcap_geterr(pd));
return -1;
}

/* set filter for port*/
if (pcap_setfilter(pd, fp) == -1) {
printf("Couldn't install filter %s: %s/n", filter_exp, pcap_geterr(pd));
return -1;
}

return 0;
}

/* packet_loop: * Worker function for packet capture thread. */
void* packet_loop(void* ptr)
{
/* loop pcap tcp/ip*/
while(running) {
pcap_loop(pd,-1,(pcap_handler)packet_handler,NULL);
}
return 0;
}

void print_usage()
{
printf(" Options:/n");
printf(" -d indicate net device name/n");
printf(" -p indicate port/n");
printf(" -v print version/n");
printf(" -h printf help/n/n");
printf("sample: -d /"eth0/" -p 8899/n/n");
}

int get_options(int argc,char **argv)
{
int ret,opt = 0;
/* read options */
while((ret = getopt(argc, argv, "d:p:h")) >= 0) {
switch(ret) {
case 'd':
strcpy(vsdev,optarg);
opt++;
break;
case 'p':
vsport = atoi(optarg);
opt++;
break;
case 'h':
print_usage();
return -1;
default:
/* shouldn't happen */
return -1;
}
}
if(opt == 2)
return 0;
return ret;
}

void sig_handler(int sig)
{
switch(sig) {
case SIGHUP:
case SIGTERM:
case SIGINT:
case SIGQUIT:
case SIGUSR1:
case SIGSEGV:
running = 0;
usleep(300000);
if(pd != NULL)
pcap_close(pd);
break;
default:
break;
}
}

int main(int argc,char **argv)
{
vsline = vsbuf;
running = 1;

signal(SIGHUP, sig_handler);
signal(SIGTERM, sig_handler);
signal(SIGINT, sig_handler);
signal(SIGQUIT, sig_handler);
signal(SIGUSR1, sig_handler);
signal(SIGSEGV, sig_handler);

/* get vstat options*/
if(get_options(argc,argv) != 0){
printf("Type vpstat -h for help./n");
return 0;
}

/* init vst struct*/
memset(&vst,0,sizeof(struct vstate));

/* init pacp with device*/
if(packet_init(vsdev) == -1)
return -1;

/* set filter for device*/
if(packet_filter(vsdev,vsport) == -1)
return -1;

initscr();

/* create pcap thread*/
pthread_t tid;
pthread_create(&tid,NULL,packet_loop,(void*)NULL);

/* loop get pid stat*/
while(running) {
/* print proc stat info*/
usleep(1000000*intetval);
calculate_tcp_rate(&vst.st_tcp);
}

endwin();
return EXIT_SUCCESS;
}