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NetBSD 6.1.5 - man page for pcap_inject (netbsd section 3)

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PCAP_INJECT(3)									   PCAP_INJECT(3)

NAME
       pcap_inject, pcap_sendpacket - transmit a packet

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_inject(pcap_t *p, const void *buf, size_t size);
       int pcap_sendpacket(pcap_t *p, const u_char *buf, int size);

DESCRIPTION
       pcap_inject()  sends a raw packet through the network interface; buf points to the data of
       the packet, including the link-layer header, and size  is  the  number  of  bytes  in  the
       packet.

       Note that, even if you successfully open the network interface, you might not have permis-
       sion to send packets on it, or it might not support sending packets;  as  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.

       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 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 do nominally  support  sending  completely
       raw and unchanged packets.

       pcap_sendpacket()  is like pcap_inject(), but it returns 0 on success, rather than return-
       ing the number of bytes written.  (pcap_inject()  comes	from  OpenBSD;	pcap_sendpacket()
       comes from WinPcap.  Both are provided for compatibility.)

RETURN VALUE
       pcap_inject() returns the number of bytes written on success and -1 on failure.

       pcap_sendpacket() returns 0 on success and -1 on failure.

       If  -1  is returned, pcap_geterr() or pcap_perror() may be called with p as an argument to
       fetch or display the error text.

SEE ALSO
       pcap(3), pcap_geterr(3)

					   5 April 2008 			   PCAP_INJECT(3)
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