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Manual Pages  — PCAP_LOOKUPDEV


pcap_lookupdev - find the default device on which to capture



#include <pcap/pcap.h>

char errbuf[PCAP_ERRBUF_SIZE];

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


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.)

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, NULL is returned and errbuf is filled in with an appropriate error message. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.




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

8 September 2017 PCAP_LOOKUPDEV (3)

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