Need help about read() and write() on TCP/IP Post: 302469669

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pcap_sendpacket

PCAP_INJECT(3PCAP)														PCAP_INJECT(3PCAP)

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 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.  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(3PCAP), pcap_geterr(3PCAP)

								   5 April 2008 						PCAP_INJECT(3PCAP)

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