pcap_inject man page on FreeBSD

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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 permission to send packets on it, or it might  not  sup‐
       port  sending packets; as pcap_open_live() doesn't have a flag to indi‐
       cate 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  returning	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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