Date: Mon, 23 Nov 1998 01:31:10 -0700 From: Wes Peters <wes@softweyr.com> To: Vladislav SAFRONOV <0824@08700000.mhs.rosmail.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Help! Modifying Linux sources to compile under 2.2.7R. Message-ID: <36591D4D.F335DC8F@softweyr.com> References: <151BD2D781F0D57E%151BD2D781F0D57E@mhs.mhs.rosmail.com>
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Vladislav SAFRONOV wrote:
>
> I want to compile a little c program under Freebsd, but the source
> warns:
>
> "Linux 2.0.33 source, will compile on BSD if you modify the ip
> header etc."
>
> I thought small tcp/ip applications could be copmiled under any Unix
> :(,
Hah! You don't understand UNIX portability that well. You always
have to poke around the various header files a bit.
> Well what should I modify? What's the difference between BSD ip
> header and Linux ip header?
Well, first of all, if you're dinking with the raw IP header, this
isn't a "typical" tcp/ip program at all. A typical tcp/ip program
just opens a socket connection and pumps data through it.
> ...
> struct iphdr *iph=(struct iphdr *)buf;
> struct udphdr *udp=(struct udphdr *)(buf + 20);
> ...
> iph->version=4;
> iph->ihl=5;
> iph->tos=0;
> iph->tot_len=htons(sizeof(buf));
> iph->id=htons(1234);
> iph->frag_off=0;
> iph->ttl=255;
> iph->protocol=17;
>
> iph->saddr=inet_addr(SIP);
> iph->daddr=resolve_address(argv[1]);
See /usr/include/netinet/ip.h, /usr/include/netinet/tcp.h, and
/usr/include/netinet/udp.h. Or, better yet, get yourself a
copy of Unix Network Program vol 1 by W. Richard Stevens.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.softweyr.com/~softweyr wes@softweyr.com
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