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pcg |
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/* |
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device-cygwin.C -- Stub for Cygwin environment |
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Copyright (C) 2003 Marc Lehmann <ocg@goof.com> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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// unfortunately, there is be no way to set MAC addresses under windows, |
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// and the default cipedrvr uses a different MAC address than we do, |
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// so this module tries to fix mac addresses in packets and arp packets. |
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// this is probably not very fast, but neither is cygwin nor poll. |
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// |
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// http://cipe-win32.sourceforge.net/ |
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#include "config.h" |
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#include <stdio.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <syslog.h> |
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#include <cstring> |
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#include "conf.h" |
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#include "util.h" |
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tap_device::tap_device () |
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{ |
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if ((fd = open (conf.ifname, O_RDWR)) < 0) |
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{ |
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slog (L_CRIT, _("could not open %s: %s"), conf.ifname, strerror (errno)); |
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exit (1); |
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} |
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} |
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tap_device::~tap_device () |
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{ |
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close (fd); |
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} |
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tap_packet * |
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tap_device::recv () |
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{ |
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tap_packet *pkt = new tap_packet; |
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pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
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if (pkt->len <= 0) |
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{ |
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slog (L_ERR, _("error while reading from %s %s: %s"), |
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info (), conf.ifname, strerror (errno)); |
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free (pkt); |
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return 0; |
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} |
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id2mac (THISNODE->id, &((*pkt)[6])); |
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if (pkt->is_arp ()) |
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{ |
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if ((*pkt)[22] == 0x08) id2mac (THISNODE->id, &((*pkt)[22])); |
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if ((*pkt)[32] == 0x08) id2mac (THISNODE->id, &((*pkt)[32])); |
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} |
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return pkt; |
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} |
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void |
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tap_device::send (tap_packet *pkt) |
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{ |
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(*pkt)[ 6] = 0x08; (*pkt)[ 7] = 0x00; (*pkt)[ 8] = 0x58; |
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(*pkt)[ 9] = 0x00; (*pkt)[10] = 0x00; (*pkt)[11] = 0x01; |
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if (pkt->is_arp ()) |
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{ |
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if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id) |
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memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac)); |
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if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id) |
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memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac)); |
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} |
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if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
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slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname, |
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strerror (errno)); |
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} |
