Shulou(Shulou.com)06/01 Report--

//Fenxi1.cpp: Defines the entry point for the console application.

//

The code is as follows:

#include "stdafx.h"

#include "pcap.h"

#include "bittypes.h"

#pragma comment(lib,"ws2_32.lib")

typedef struct ip_address{

u_char byte1;

u_char byte2;

u_char byte3;

u_char byte4;

}ip_address;

/* IPv4 header */

typedef struct ip_header{

u_char ver_ihl; //version (4 bits) + header length (4 bits)

u_char tos; //Type of service

u_short tlen; //Total length

u_short identification; //Identification

u_short flags_fo; //Flags (3 bits) + Fragment offset (13 bits)

u_char ttl; //Time to live

u_char proto; //protocol (Protocol)

u_short crc; //Header checksum

ip_address saddr; //Source address

ip_address daddr; //Destination address

u_int op_pad; //Option + Padding

}ip_header;

/* UDP header */

typedef struct udp_header{

u_short sport; //Source port

u_short dport; //Destination port

u_short len; // UDP Datagram length

u_short crc; //Checksum

}udp_header;

/* Callback function prototype */

void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);

int _tmain(int argc, _TCHAR* argv[])

{

pcap_if_t *alldevs;

pcap_if_t *d;

int inum;

int i=0;

pcap_t *adhandle;

char errbuf[PCAP_ERRBUF_SIZE];

u_int netmask;

char packet_filter[] = "ip and udp";

struct bpf_program fcode;

/* Get device list */

if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)

{

fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);

exit(1);

}

/* Print list */

for(d=alldevs; d; d=d->next)

{

printf("%d. %s", ++i, d->name);

if (d->description)

printf(" (%s)\n", d->description);

else

printf(" (No description available)\n");

}

if(i==0)

{

printf("\nNo interfaces found! Make sure WinPcap is installed.\ n");

return -1;

}

printf("Enter the interface number (1-%d):",i);

scanf("%d", &inum);

if(inum

i)

{

printf("\nInterface number out of range.\ n");

/* Release Device List */

pcap_freealldevs(alldevs);

return -1;

}

/* Jump to selected device */

for(d=alldevs, i=0; i

next, i++);

/* Open adapter */

if ( (adhandle= pcap_open(d->name, //device name

65536, //Part of packet to capture

// 65535 Guaranteed to capture the full contents of every packet on different data link layers

PCAP_OPENFLAG_PROMISCUOUS, //promiscuous mode

1000, //read timeout

NULL, //remote machine validation

errbuf //error buffer pool

) ) == NULL)

{

fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n");

/* Release Device List */

pcap_freealldevs(alldevs);

return -1;

}

/* Check the data link layer, for simplicity we will only consider Ethernet */

if(pcap_datalink(adhandle) != DLT_EN10MB)

{

fprintf(stderr,"\nThis program works only on Ethernet networks.\ n");

/* Release Device List */

pcap_freealldevs(alldevs);

return -1;

}

if(d->addresses != NULL)

/* Get mask for first address of interface */

netmask=((struct sockaddr_in *)(d->addresses->netmask))->sin_addr.S_un.S_addr;

else

/* If the interface does not have an address, then we assume a mask of class C */

netmask=0xffffff;

//compile filter

if (pcap_compile(adhandle, &fcode, packet_filter, 1, netmask) ts.tv_sec;

ltime=localtime(&local_tv_sec);

strftime( timestr, sizeof timestr, "%H:%M:%S", ltime);

/* Print packet timestamp and length */

printf("%s.%. 6d len:%d ", timestr, header->ts.tv_usec, header->len);

/* Get IP packet header location */

ih = (ip_header *) (pkt_data +

14); //Ethernet header length

/* Get UDP header location */

ip_len = (ih->ver_ihl & 0xf) * 4;

uh = (udp_header *) ((u_char*)ih + ip_len);

/* Convert network byte sequence to host byte sequence */

sport = ntohs( uh->sport );

dport = ntohs( uh->dport );

/* Print IP address and UDP port */

printf("%d.% d.% d.% d.% d -> %d.% d.% d.% d.% d\n",

ih->saddr.byte1,

ih->saddr.byte2,

ih->saddr.byte3,

ih->saddr.byte4,

sport,

ih->daddr.byte1,

ih->daddr.byte2,

ih->daddr.byte3,

ih->daddr.byte4,

dport);

}

Item-->** Attributes (alt+F7)

Configuration Properties-->C/C++--> General--> Attach Include Directory-->(Add the file path (Include) where the header file is located to the Attach Directory C:\WpdPack\Include)

Item-->** Attributes (alt+F7)

Configuration Properties--> Linker--> General--> Add-on Library Directory-->(add Packet.lib;wpcap.lib directory (Lib) to Add-on Library Directory C:\WpdPack\Lib)

Item-->** Attributes (alt+F7)

Configuration Properties--> Linkers--> Input--> Additional Dependency--> Supplement ";Packet.lib;wpcap.lib"

Item-->** Attributes (alt+F7)

Configuration Properties-->C/C++-> Preprocessor--> Preprocessor Definition--> Supplement ";HAVE_REMOTE"

Add the head as follows

#include "pcap.h"

#include "bittypes.h"

#pragma comment(lib,"ws2_32.lib")

Below is the result chart obtained:

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