mirror of
https://gitlab.isc.org/isc-projects/dhcp
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Initial interface discovery and input dispatch routines
This commit is contained in:
Ted Lemon
parent
8cb330986e
commit
decf33c222
174
common/dispatch.c
Normal file
174
common/dispatch.c
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@ -0,0 +1,174 @@
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/* socket.c
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BSD socket interface code... */
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/*
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* Copyright (c) 1995, 1996 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1995 The Internet Software Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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#include <sys/ioctl.h>
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struct interface_info *interfaces;
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/* Use the SIOCGIFCONF ioctl to get a list of all the attached interfaces.
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For each interface that's of type INET and not the loopback interface,
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register that interface with the network I/O software, figure out what
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subnet it's on, and add it to the list of interfaces. */
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void get_interface_list ()
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{
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struct interface_info *tmp;
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static char buf [8192];
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struct ifconf ic;
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int i;
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int sock;
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int ifcount = 0;
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int ifix = 0;
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/* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
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if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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error ("Can't create addrlist socket");
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/* Get the interface configuration information... */
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ic.ifc_len = sizeof buf;
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ic.ifc_ifcu.ifcu_buf = (caddr_t)buf;
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i = ioctl(sock, SIOCGIFCONF, &ic);
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close (sock);
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if (i < 0)
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error ("ioctl: SIOCGIFCONF: %m");
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/* Cycle through the list of interfaces looking for IP addresses.
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Go through twice; once to count the number if addresses, and a
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second time to copy them into an array of addresses. */
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for (i = 0; i < ic.ifc_len;) {
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struct ifreq *ifp = (struct ifreq *)((caddr_t)ic.ifc_req + i);
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#ifdef HAVE_SIN_LEN
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i += (sizeof ifp -> ifr_name) + ifp -> ifr_addr.sa_len;
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#else
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i += sizeof *ifp;
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#endif
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if (ifp -> ifr_addr.sa_family == AF_INET) {
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struct sockaddr_in *foo =
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(struct sockaddr_in *)(&ifp -> ifr_addr);
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/* We don't want the loopback interface. */
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if (foo -> sin_addr.s_addr == INADDR_LOOPBACK)
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continue;
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tmp = ((struct interface_info *)
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dmalloc (sizeof *tmp, "get_interface_list"));
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if (!tmp)
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error ("Insufficient memory to "
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"record interface");
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memset (tmp, 0, sizeof *tmp);
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tmp -> address.len = 4;
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memcpy (tmp -> address.iabuf, &foo -> sin_addr.s_addr);
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tmp -> local_subnet = find_subnet (tmp -> address);
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if_register_send (tmp, ifp);
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if_register_receive (tmp, ifp);
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}
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}
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}
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/* Wait for packets to come in using select(). When one does, call
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receive_packet to receive the packet and possibly strip hardware
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addressing information from it, and then call do_packet to try to
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do something with it. */
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void dispatch ()
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{
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struct sockaddr_in from;
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struct hardware_addr hfrom;
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struct iaddr ifrom;
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fd_set r, w, x;
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struct interface_info *l;
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int max = 0;
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int count;
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int result;
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static unsigned char packbuf [4095]; /* Packet input buffer.
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Must be as large as largest
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possible MTU. */
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FD_ZERO (&r);
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FD_ZERO (&w);
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FD_ZERO (&x);
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do {
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/* Set up the read mask. */
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for (l = sockets; l; l = l -> next) {
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FD_SET (l -> sock, &r);
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FD_SET (l -> sock, &x);
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if (l -> sock > max)
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max = l -> sock;
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}
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/* Wait for a packet or a timeout... XXX */
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count = select (max + 1, &r, &w, &x, (struct timeval *)0);
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/* Get the current time... */
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GET_TIME (&cur_time);
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/* Not likely to be transitory... */
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if (count < 0)
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error ("select: %m");
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for (l = interfaces; l; l = l -> next) {
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if (!FD_ISSET (l -> rfdesc, &r))
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continue;
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if ((result =
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receive_packet (l, packbuf, sizeof packbuf,
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&from, &hfrom)) < 0) {
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warn ("receive_packet failed on %s: %m",
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inet_ntoa (l -> addr.sin_addr));
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continue;
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}
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note ("request from %s, port %d",
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inet_ntoa (from.sin_addr),
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htons (from.sin_port));
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ifrom.len = 4;
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memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
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do_packet (l, packbuf, result,
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from.sin_port, ifrom, hfrom);
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}
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} while (1);
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}
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174
dispatch.c
Normal file
174
dispatch.c
Normal file
@ -0,0 +1,174 @@
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/* socket.c
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BSD socket interface code... */
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/*
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* Copyright (c) 1995, 1996 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
|
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* are met:
|
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*
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
|
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* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
|
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
|
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* from this software without specific prior written permission.
|
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
|
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
|
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1995 The Internet Software Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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#include <sys/ioctl.h>
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struct interface_info *interfaces;
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/* Use the SIOCGIFCONF ioctl to get a list of all the attached interfaces.
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For each interface that's of type INET and not the loopback interface,
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register that interface with the network I/O software, figure out what
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subnet it's on, and add it to the list of interfaces. */
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void get_interface_list ()
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{
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struct interface_info *tmp;
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static char buf [8192];
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struct ifconf ic;
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int i;
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int sock;
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int ifcount = 0;
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int ifix = 0;
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/* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
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if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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error ("Can't create addrlist socket");
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/* Get the interface configuration information... */
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ic.ifc_len = sizeof buf;
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ic.ifc_ifcu.ifcu_buf = (caddr_t)buf;
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i = ioctl(sock, SIOCGIFCONF, &ic);
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close (sock);
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if (i < 0)
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error ("ioctl: SIOCGIFCONF: %m");
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/* Cycle through the list of interfaces looking for IP addresses.
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Go through twice; once to count the number if addresses, and a
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second time to copy them into an array of addresses. */
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for (i = 0; i < ic.ifc_len;) {
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struct ifreq *ifp = (struct ifreq *)((caddr_t)ic.ifc_req + i);
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#ifdef HAVE_SIN_LEN
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i += (sizeof ifp -> ifr_name) + ifp -> ifr_addr.sa_len;
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#else
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i += sizeof *ifp;
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#endif
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if (ifp -> ifr_addr.sa_family == AF_INET) {
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struct sockaddr_in *foo =
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(struct sockaddr_in *)(&ifp -> ifr_addr);
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/* We don't want the loopback interface. */
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if (foo -> sin_addr.s_addr == INADDR_LOOPBACK)
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continue;
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tmp = ((struct interface_info *)
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dmalloc (sizeof *tmp, "get_interface_list"));
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if (!tmp)
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error ("Insufficient memory to "
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"record interface");
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memset (tmp, 0, sizeof *tmp);
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tmp -> address.len = 4;
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memcpy (tmp -> address.iabuf, &foo -> sin_addr.s_addr);
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tmp -> local_subnet = find_subnet (tmp -> address);
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if_register_send (tmp, ifp);
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if_register_receive (tmp, ifp);
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}
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}
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}
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/* Wait for packets to come in using select(). When one does, call
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receive_packet to receive the packet and possibly strip hardware
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addressing information from it, and then call do_packet to try to
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do something with it. */
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void dispatch ()
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{
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struct sockaddr_in from;
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struct hardware_addr hfrom;
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struct iaddr ifrom;
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fd_set r, w, x;
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struct interface_info *l;
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int max = 0;
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int count;
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int result;
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static unsigned char packbuf [4095]; /* Packet input buffer.
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Must be as large as largest
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possible MTU. */
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FD_ZERO (&r);
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FD_ZERO (&w);
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FD_ZERO (&x);
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do {
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/* Set up the read mask. */
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for (l = sockets; l; l = l -> next) {
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FD_SET (l -> sock, &r);
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FD_SET (l -> sock, &x);
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if (l -> sock > max)
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max = l -> sock;
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}
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/* Wait for a packet or a timeout... XXX */
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count = select (max + 1, &r, &w, &x, (struct timeval *)0);
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/* Get the current time... */
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GET_TIME (&cur_time);
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/* Not likely to be transitory... */
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if (count < 0)
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error ("select: %m");
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for (l = interfaces; l; l = l -> next) {
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if (!FD_ISSET (l -> rfdesc, &r))
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continue;
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if ((result =
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receive_packet (l, packbuf, sizeof packbuf,
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&from, &hfrom)) < 0) {
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warn ("receive_packet failed on %s: %m",
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inet_ntoa (l -> addr.sin_addr));
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continue;
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}
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note ("request from %s, port %d",
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inet_ntoa (from.sin_addr),
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htons (from.sin_port));
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ifrom.len = 4;
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memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
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do_packet (l, packbuf, result,
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from.sin_port, ifrom, hfrom);
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}
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} while (1);
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}
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