PCAP_LOOKUPDEV(3) | Library Functions Manual | PCAP_LOOKUPDEV(3)

# NAME

pcap_lookupdev - find the default device on which to capture

# SYNOPSIS

    #include <pcap/pcap.h>

    char errbuf[PCAP_ERRBUF_SIZE];

    [DEPRECATED] char *pcap_lookupdev(char *errbuf);

# DESCRIPTION

This interface is obsoleted by pcap_findalldevs(3). To find a default device on which to capture, call pcap_findalldevs() and, if the list it returns is not empty, use the first device in the list. (If the list is empty, there are no devices on which capture is possible.) errbuf is a buffer large enough to hold at least PCAP_ERRBUF_SIZE chars.

If pcap_init(3) has been called, this interface always returns NULL.

pcap_lookupdev() returns a pointer to a string giving the name of a network device suitable for use with pcap_create(3) and pcap_activate(3), or with pcap_open_live(3), and with pcap_lookupnet(3). If there is an error, or if pcap_init(3) has been called, NULL is returned and errbuf is filled in with an appropriate error message.

# SEE ALSO

pcap(3)

# BUGS

The pointer returned by pcap_lookupdev() points to a static buffer; subsequent calls to pcap_lookupdev() in the same thread, or calls to pcap_lookupdev() in another thread, may overwrite that buffer.

In WinPcap and Npcap, this function may return a UTF-16 string rather than an ASCII or UTF-8 string.

30 November 2023 |