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pcap_open_offline.3pcap

NAME

pcap_open_offline, pcap_fopen_offline - open a saved capture file for reading

SYNOPSIS

 #include <pcap/pcap.h>
 
 char errbuf[PCAP_ERRBUF_SIZE];
 
 pcap_t *pcap_open_offline(const char *fname, char *errbuf);
 pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);
 

DESCRIPTION

pcap_open_offline() is called to open a ``savefile'' for reading.

fname specifies the name of the file to open. The file can have the pcap file format as described in pcap-savefile(5), which is the file format used by, among other programs, tcpdump(1) and tcpslice(1), or can have the pcap-ng file format, although not all pcap-ng files can be read. The name "-" in a synonym for stdin.

Alternatively, you may call pcap_fopen_offline() to read dumped data from an existing open stream fp. Note that on Windows, that stream should be opened in binary mode.

RETURN VALUE

pcap_open_offline() and pcap_fopen_offline() return a pcap_t * on success and NULL on failure. If NULL is returned, errbuf is filled in with an appropriate error message. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.

SEE ALSO

pcap(3PCAP), pcap-savefile(5)