Date: Wed, 10 Dec 2003 22:13:36 +0200 From: Alin-Adrian Anton <aanton@reversedhell.net> To: Andy Hilker <ah@cryptobank.de>, freebsd-hackers@FreeBSD.ORG Subject: Re: porting linux SOCK_RAW to freebsd Message-ID: <3FD77E70.7060500@reversedhell.net> In-Reply-To: <20031210123251.GA12847@goodhope.crypta.net> References: <20031210123251.GA12847@goodhope.crypta.net>
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Andy Hilker wrote:
>Hi,
>
>i try porting a little utility from linux to freebsd.
>Maybe someone could give me a hint, what i am doing wrong.
>
>
>-- snip --
> /* Note: not portable */
> // if ((s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET)) < 0) {
> // ??? ported
> if ((s = socket(AF_INET,SOCK_RAW,IPPROTO_RAW)) < 0) {
> if (errno == EPERM)
> fprintf(stderr, "programm must run as root\n");
> else
> perror("programm: socket");
> if (! debug)
> return 2;
> }
>
>
> /* Fill in the source address, if possible.
> The code to retrieve the local station address is Linux specific. */
> /* Note: not portable */
> /*
> if (! opt_no_src_addr){
> struct ifreq if_hwaddr;
> unsigned char *hwaddr = ifr_addr.sa_data;
>
> strcpy(if_hwaddr.ifr_name, ifname);
> if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0) {
> fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", ifname,
> strerror(errno));
> return 1;
> }
> memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
>
> if (verbose) {
> printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
> "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", ifname,
> if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
> hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
> }
> }
> */
> // ??? ported, xx:xx:xx:xx:xx:xx = MAC Adress of sender
> memcpy(outpack+6, "xx:xx:xx:xx:xx:xx", 6);
>
>
> /* Note: not portable */
> /*
> whereto.sa_family = 0;
> strcpy(whereto.sa_data, ifname);
>
> if ((i = sendto(s, outpack, pktsize, 0, &whereto, sizeof(whereto))) < 0)
> perror("sendto");
> else if (debug)
> printf("sendto returned %d.\n", i);
> */
> // ??? ported, fxp0 = sending interface
> whereto.sa_family = 0;
> strcpy(whereto.sa_data, "fxp0");
>
> if ((i = sendto(s, outpack, pktsize, 0, &whereto, sizeof(whereto))) < 0)
> perror("sendto");
> else if (debug)
> printf("sendto returned %d.\n", i);
>-- snip --
>
>bye,
>Andy
>
>
>
I wrote a paper on FreeBSD raw sockets a while ago. You can find it here:
http://www.reversedhell.net/rawsockets/raw_tcp.tgz
or here:
http://packetstormsecurity.org/programming-tutorials/raw_tcp.tgz
Cheers/bye,
Alin.
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