2009-03-21 20:43:56 +00:00
|
|
|
.\" Copyright (c) 1994, 1996, 1997
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that: (1) source code distributions
|
|
|
|
|
.\" retain the above copyright notice and this paragraph in its entirety, (2)
|
|
|
|
|
.\" distributions including binary code include the above copyright notice and
|
|
|
|
|
.\" this paragraph in its entirety in the documentation or other materials
|
|
|
|
|
.\" provided with the distribution, and (3) all advertising materials mentioning
|
|
|
|
|
.\" features or use of this software display the following acknowledgement:
|
|
|
|
|
.\" ``This product includes software developed by the University of California,
|
|
|
|
|
.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
|
|
|
.\" the University nor the names of its contributors may be used to endorse
|
|
|
|
|
.\" or promote products derived from this software without specific prior
|
|
|
|
|
.\" written permission.
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
|
|
|
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
|
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
|
.\"
|
2017-02-12 07:04:44 +00:00
|
|
|
.TH PCAP_INJECT 3PCAP "3 January 2014"
|
2009-03-21 20:43:56 +00:00
|
|
|
.SH NAME
|
|
|
|
|
pcap_inject, pcap_sendpacket \- transmit a packet
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
.ft B
|
|
|
|
|
#include <pcap/pcap.h>
|
|
|
|
|
.ft
|
|
|
|
|
.LP
|
|
|
|
|
.ft B
|
|
|
|
|
int pcap_inject(pcap_t *p, const void *buf, size_t size);
|
|
|
|
|
int pcap_sendpacket(pcap_t *p, const u_char *buf, int size);
|
|
|
|
|
.ft
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
.B pcap_inject()
|
|
|
|
|
sends a raw packet through the network interface;
|
|
|
|
|
.I buf
|
|
|
|
|
points to the data of the packet, including the link-layer header, and
|
|
|
|
|
.I size
|
|
|
|
|
is the number of bytes in the packet.
|
|
|
|
|
.PP
|
|
|
|
|
Note that, even if you successfully open the network interface, you
|
|
|
|
|
might not have permission to send packets on it, or it might not support
|
|
|
|
|
sending packets; as
|
|
|
|
|
.I pcap_open_live()
|
|
|
|
|
doesn't have a flag to indicate whether to open for capturing, sending,
|
|
|
|
|
or capturing and sending, you cannot request an open that supports
|
|
|
|
|
sending and be notified at open time whether sending will be possible.
|
|
|
|
|
Note also that some devices might not support sending packets.
|
|
|
|
|
.PP
|
|
|
|
|
Note that, on some platforms, the link-layer header of the packet that's
|
|
|
|
|
sent might not be the same as the link-layer header of the packet
|
|
|
|
|
supplied to
|
|
|
|
|
.BR pcap_inject() ,
|
|
|
|
|
as the source link-layer address, if the header contains such an
|
|
|
|
|
address, might be changed to be the address assigned to the interface on
|
|
|
|
|
which the packet it sent, if the platform doesn't support sending
|
|
|
|
|
completely raw and unchanged packets. Even worse, some drivers on some
|
|
|
|
|
platforms might change the link-layer type field to whatever value
|
|
|
|
|
libpcap used when attaching to the device, even on platforms that
|
|
|
|
|
.I do
|
|
|
|
|
nominally support sending completely raw and unchanged packets.
|
|
|
|
|
.PP
|
|
|
|
|
.B pcap_sendpacket()
|
|
|
|
|
is like
|
|
|
|
|
.BR pcap_inject() ,
|
|
|
|
|
but it returns 0 on success, rather than returning the number of bytes
|
|
|
|
|
written.
|
|
|
|
|
.RB ( pcap_inject()
|
|
|
|
|
comes from OpenBSD;
|
|
|
|
|
.B pcap_sendpacket()
|
|
|
|
|
comes from WinPcap. Both are provided for compatibility.)
|
|
|
|
|
.SH RETURN VALUE
|
|
|
|
|
.B pcap_inject()
|
|
|
|
|
returns the number of bytes written on success and \-1 on failure.
|
|
|
|
|
.PP
|
|
|
|
|
.B pcap_sendpacket()
|
|
|
|
|
returns 0 on success and \-1 on failure.
|
|
|
|
|
.PP
|
|
|
|
|
If \-1 is returned,
|
|
|
|
|
.B pcap_geterr()
|
|
|
|
|
or
|
|
|
|
|
.B pcap_perror()
|
|
|
|
|
may be called with
|
|
|
|
|
.I p
|
|
|
|
|
as an argument to fetch or display the error text.
|
|
|
|
|
.SH SEE ALSO
|
|
|
|
|
pcap(3PCAP), pcap_geterr(3PCAP)
|
