Re: libpcap pcap_sendpacket support across platforms.

[Guy Harris <gharris () sonic net>]

On Sat, Mar 13, 2004 at 06:46:33AM -0800, Mark Pizzolato wrote:
> However, that problem can easily be solved with the following:
>
>        [...]
>         fd  = open(device, O_RDWR);
>         if (fd < 0 && errno == EACCES)
>                 fd  = open(device, O_RDONLY);
>        [...]
>
> This would then leave the pcap connection to behave in a more consistent way
> across all platforms (i.e. you can write to the connection when you have
> privilege/authority to do so).

OK.

> Attached is a revised patch, which keeps prior behaviors, while also
> providing for pcap_sendpacket when possible.

I've merged your changes with a version I'd been working on, based on
libnet and some stuff we had at Network Appliance, and checked the
result in.  It implements *two* APIs - "pcap_inject()", from OpenBSD,
and "pcap_sendpacket()", from WinPcap.

Some issues:

        on BPF, libpcap doesn't do anything with BIOCSHDRCMPLT - libnet
        does;

        on DLPI, there's #if'ed-out code to use the appropriate "raw
        data" primitives on HP-UX - I don't have access to an HP-UX
        system on which to test them;

        on Linux, the version I checked in uses "sendto()", as that's
        what libnet did;

        on SunOS 4.x with STREAMS NIT, the code I checked in uses
        "putmsg()" - libnet and your code used "sendto()", but, as I
        remember, the Network Appliance code used "putmsg()", which is
        what I'd expect to be the correct call to use on a STREAMS-based
        mechanism.

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