Linux cli command pcap_datalinkpcap

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command pcap_datalinkpcap and provides detailed information about the command pcap_datalinkpcap, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the pcap_datalinkpcap.

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NAME 🖥️ pcap_datalinkpcap 🖥️

get the link-layer header type

SYNOPSIS

#include <pcap/pcap.h>
int pcap_datalink(pcap_t *p);

DESCRIPTION

pcap_datalink() returns the link-layer header type for the live capture or ``savefile’’ specified by p.

It must not be called on a pcap descriptor created by pcap_create(3PCAP) that has not yet been activated by pcap_activate(3PCAP).

https://www.tcpdump.org/linktypes.html lists the values pcap_datalink() can return and describes the packet formats that correspond to those values.

Do NOT assume that the packets for a given capture or ``savefile`` will have any given link-layer header type, such as DLT_EN10MB for Ethernet. For example, the “any” device on Linux will have a link-layer header type of DLT_LINUX_SLL or DLT_LINUX_SLL2 even if all devices on the system at the time the “any” device is opened have some other data link type, such as DLT_EN10MB for Ethernet.

RETURN VALUE

pcap_datalink() returns the link-layer header type on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated.

SEE ALSO

pcap(3PCAP), pcap-linktype(7)

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