Получение огромного значения в caplen и len в захвате пакетов winpcap

Я пишу программу захвата пакетов.
Я использую npcap и прикрепляю код, а также вывод при запуске ..
Проблема заключается в том, что напечатанные значения caplen и len очень большие цифры … и иногда слишком малы, иногда равные 20, что невозможно.
Код — это простой пример кода, который поставляется с npcap.
Может кто-то предположить, что здесь идет не так ..?

Удивительно, но захваченный файл при открытии в wireshark имеет точное количество пакетов, и пакеты также читаются.
Так что не удивительно, почему caplen и len показывают неправильные цифры.

Code is :

.#ifdef _MSC_VER
/*
* we do not want the warnings about the old deprecated and unsecure CRT functions
* since these examples can be compiled under *nix as well
*/
.#define _CRT_SECURE_NO_WARNINGS
.#endif

.#include "pcap.h"
/* prototype of the packet handler */
void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);

int main(int argc, char **argv)
{
pcap_if_t *alldevs;
pcap_if_t *d;
int inum;
int i=0;
pcap_t *adhandle;
char errbuf[PCAP_ERRBUF_SIZE];
pcap_dumper_t *dumpfile;/* Check command line */
if(argc != 2)
{
printf("usage: %s filename", argv[0]);
return -1;
}

/* Retrieve the device list on the local machine */
if (pcap_findalldevs(&alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
return 0;
}

/* Print the 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 < 1 || inum > i)
{
printf("\nInterface number out of range.\n");
/* Free the device list */
pcap_freealldevs(alldevs);
return -1;
}

/* Jump to the selected adapter */
for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);/* Open the adapter */
if ((adhandle= pcap_open_live(d->name,  // name of the device
65536,         // portion of the packet to capture.
// 65536 grants that the whole packet will be captured on all the MACs.
1,             // promiscuous mode (nonzero means promiscuous)
1000,          // read timeout
errbuf         // error buffer
)) == NULL)
{
fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
/* Free the device list */
pcap_freealldevs(alldevs);
return -1;
}

/* Open the dump file */
dumpfile = pcap_dump_open(adhandle, argv[1]);

if(dumpfile==NULL)
{
fprintf(stderr,"\nError opening output file\n");
return -1;
}

printf("\nlistening on %s... Press Ctrl+C to stop...\n", d->description);

/* At this point, we no longer need the device list. Free it */
pcap_freealldevs(alldevs);

/* start the capture */
pcap_loop(adhandle, 0, packet_handler, (unsigned char *)dumpfile);

pcap_close(adhandle);
return 0;
}

int count = 0;
/* Callback function invoked by libpcap for every incoming packet */
void packet_handler(u_char *dumpfile, const struct pcap_pkthdr *header, const u_char *pkt_data)
{

printf ("\nPacket count is %d", count++);
/* save the packet on the dump file */
pcap_dump(dumpfile, header, pkt_data);

printf("\n\nRecieved Packet Size caplen: %zu", header->caplen); /* Length of header */
printf("\nRecieved Packet Size just len: %lu\n", header->len); /* Length of header */

}Output of the program :C:\eclipse\w1\tn\Debug>tn pdump
1. \Device\NPF_{3A8147EC-2368-4216-9603-7641E806F7CE} (Realtek PCIe GBE Family Controller)
2. \Device\NPF_{E39C84EC-CB5D-4300-A5C1-C63EDE0B583C} (Microsoft)
3. \Device\NPF_{2F63E116-DEB4-4FE4-9E27-85DCA9E68C5C} (VMware Virtual Ethernet Adapter)
4. \Device\NPF_{996ACB8F-C0AC-4FF3-8E79-B0C849CC9CF1} (MS NDIS 6.0 LoopBack Driver)
5. \Device\NPF_{619BA8D0-363E-4BCB-8739-4537D3FDAD87} (MS NDIS 6.0 LoopBack Driver)
6. \Device\NPF_{E2FB8B54-0E25-498C-975A-32873AC52060} (VMware Virtual Ethernet Adapter)
7. \Device\NPF_{9B17BD4E-E20D-43A3-A8C6-AC8C3C431182} (Microsoft)
Enter the interface number (1-7):2

listening on Microsoft... Press Ctrl+C to stop...

Packet count is 0

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 1

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 2

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 3

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 4

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 5

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 6

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 7

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 8

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 9

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 10

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 11

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 12

Recieved Packet Size caplen: 1342177300
Recieved Packet Size just len: 3632886444

Packet count is 13

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 14

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 15

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 16

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 17

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 18

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 19

Recieved Packet Size caplen: 1161363476
Recieved Packet Size just len: 4294967295

Packet count is 20

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 6160385

Packet count is 21

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 22

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 23

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 24

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 25

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 26

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 27

Recieved Packet Size caplen: 4278190100
Recieved Packet Size just len: 4294967295

Packet count is 28

Recieved Packet Size caplen: 16711700
Recieved Packet Size just len: 4294967295

Packet count is 29

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 4294967295

Packet count is 30

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 4294967295

Packet count is 31

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 4294967295

Packet count is 32

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 33

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 34

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 35

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 36

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 2136866817

Packet count is 37

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 38

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 39

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 40

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 41

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 3632886444

Packet count is 42

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 3632886444

Packet count is 43

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 44

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 45

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 46

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 47

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 48

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 49

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 50

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 51

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 52

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 53

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 54

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 55

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 6160385

Packet count is 56

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 57

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 58

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 2136866817

Packet count is 59

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 2136866817

Packet count is 60

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 2136866817

Packet count is 61

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 2136866817

Packet count is 62

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 63

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 64

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 65

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 66

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 67

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 68

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 69

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 70

Recieved Packet Size caplen: 1929379860
Recieved Packet Size just len: 3632886444

Packet count is 71

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 72

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 73

Recieved Packet Size caplen: 5111828
Recieved Packet Size just len: 3632886444

Packet count is 74

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 75

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 76

Recieved Packet Size caplen: 5701652
Recieved Packet Size just len: 3632886444

Packet count is 77

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 78

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 79

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 80

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 81

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 82

Recieved Packet Size caplen: 822083604
Recieved Packet Size just len: 3632886444

Packet count is 83

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 84

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 85

Recieved Packet Size caplen: 1448083476
Recieved Packet Size just len: 3632886444

Packet count is 86

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 87

Recieved Packet Size caplen: 1073741844
Recieved Packet Size just len: 3632886444

Packet count is 88

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 89

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 90

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 91

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 92

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 93

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 94

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 95

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 96

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 97

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 98

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 99

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 100

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 101

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 102

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 1970834832

Packet count is 103

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 104

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 105

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 106

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 107

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 108

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 109

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 3632886444

Packet count is 110

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 111

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 112

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 113

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 114

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 3632886444

Packet count is 115

Recieved Packet Size caplen: 562102292
Recieved Packet Size just len: 1970834832

Packet count is 116

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 117

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 118

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 119

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 120

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 121

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 1970834832

Packet count is 122

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 3632886444

Packet count is 123

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 124

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 125

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 126

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 1970834832

Packet count is 127

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 128

Recieved Packet Size caplen: 4294901780
Recieved Packet Size just len: 1970834832

Packet count is 129

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 130

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 131

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 132

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 1970834832

Packet count is 133

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 134

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 135

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 136

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 4294967295

Packet count is 137

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 3632886444

Packet count is 138

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 139

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 4294967295

Packet count is 140

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 4294967295

Packet count is 141

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 142

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 4294967295

Packet count is 143

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 4294967295

Packet count is 144

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 145

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 146

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 4294967295

Packet count is 147

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 148

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 3632886444

Packet count is 149

Recieved Packet Size caplen: 4281532436
Recieved Packet Size just len: 4294967295

Packet count is 150

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 151

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 152

Recieved Packet Size caplen: 858980372
Recieved Packet Size just len: 4294967295

Packet count is 153

Recieved Packet Size caplen: 872349716
Recieved Packet Size just len: 4294967295

Packet count is 154

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 155

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 156

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 157

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 158

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 159

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 160

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 161

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 162

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 163

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295

Packet count is 164

Recieved Packet Size caplen: 20
Recieved Packet Size just len: 4294967295