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pcap_inject(3)                                            pcap_inject(3)




NAME

       pcap_inject, pcap_sendpacket - transmit a packet


SYNOPSIS

       #include <pcap/pcap.h>

       pcap_inject(3) *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 support
       sending packets; as pcap_open_live(3) 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 returning the number of bytes written.  (pcap_inject() comes
       from OpenBSD; pcap_sendpacket() comes from WinPcap/Npcap.  Both are
       provided for compatibility.)


RETURN VALUE

       pcap_inject() returns the number of bytes written on success,
       PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been
       created but not activated, and PCAP_ERROR on other errors.

       pcap_sendpacket() returns 0 on success, PCAP_ERROR_NOT_ACTIVATED if
       called on a capture handle that has been created but not activated, and
       PCAP_ERROR on other errors.

       If PCAP_ERROR is returned, pcap_geterr(3) or pcap_perror(3) may
       be called with p as an argument to fetch or display the error text.


SEE ALSO

       pcap(3)



                                  5 March 2022                pcap_inject(3)

libpcap 1.10.2 - Generated Mon Jan 2 07:33:50 CST 2023
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