Network input dispatcher... */
/*
- * Copyright (c) 1995, 1996 The Internet Software Consortium.
+ * Copyright (c) 1995, 1996, 1998 The Internet Software Consortium.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#ifndef lint
static char copyright[] =
-"$Id: dispatch.c,v 1.50 1998/06/25 02:55:16 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
+"$Id: dispatch.c,v 1.51 1998/10/17 13:35:24 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
-#include <sys/ioctl.h>
-struct interface_info *interfaces, *dummy_interfaces;
struct protocol *protocols;
struct timeout *timeouts;
static struct timeout *free_timeouts;
-static int interfaces_invalidated;
-void (*bootp_packet_handler) PROTO ((struct interface_info *,
- struct dhcp_packet *, int, unsigned int,
- struct iaddr, struct hardware *));
-static void got_one PROTO ((struct protocol *));
-int quiet_interface_discovery;
-
-/* Use the SIOCGIFCONF ioctl to get a list of all the attached interfaces.
- For each interface that's of type INET and not the loopback interface,
- register that interface with the network I/O software, figure out what
- subnet it's on, and add it to the list of interfaces. */
-
-void discover_interfaces (state)
- int state;
-{
- struct interface_info *tmp;
- struct interface_info *last, *next;
- char buf [8192];
- struct ifconf ic;
- struct ifreq ifr;
- int i;
- int sock;
- int address_count = 0;
- struct subnet *subnet;
- struct shared_network *share;
- struct sockaddr_in foo;
- int ir;
-#ifdef ALIAS_NAMES_PERMUTED
- char *s;
-#endif
-#ifdef USE_FALLBACK
- static struct shared_network fallback_network;
-#endif
-
- /* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
- if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
- error ("Can't create addrlist socket");
-
- /* Get the interface configuration information... */
- ic.ifc_len = sizeof buf;
- ic.ifc_ifcu.ifcu_buf = (caddr_t)buf;
- i = ioctl(sock, SIOCGIFCONF, &ic);
-
- if (i < 0)
- error ("ioctl: SIOCGIFCONF: %m");
-
- /* If we already have a list of interfaces, and we're running as
- a DHCP server, the interfaces were requested. */
- if (interfaces && (state == DISCOVER_SERVER ||
- state == DISCOVER_RELAY ||
- state == DISCOVER_REQUESTED))
- ir = 0;
- else if (state == DISCOVER_UNCONFIGURED)
- ir = INTERFACE_REQUESTED | INTERFACE_AUTOMATIC;
- else
- ir = INTERFACE_REQUESTED;
-
- /* Cycle through the list of interfaces looking for IP addresses.
- Go through twice; once to count the number of addresses, and a
- second time to copy them into an array of addresses. */
- for (i = 0; i < ic.ifc_len;) {
- struct ifreq *ifp = (struct ifreq *)((caddr_t)ic.ifc_req + i);
-#ifdef HAVE_SA_LEN
- if (ifp -> ifr_addr.sa_len)
- i += (sizeof ifp -> ifr_name) + ifp -> ifr_addr.sa_len;
- else
-#endif
- i += sizeof *ifp;
-
-#ifdef ALIAS_NAMES_PERMUTED
- if ((s = strrchr (ifp -> ifr_name, ':'))) {
- *s = 0;
- }
-#endif
-
-#ifdef SKIP_DUMMY_INTERFACES
- if (!strncmp (ifp -> ifr_name, "dummy", 5))
- continue;
-#endif
-
-
- /* See if this is the sort of interface we want to
- deal with. */
- strcpy (ifr.ifr_name, ifp -> ifr_name);
- if (ioctl (sock, SIOCGIFFLAGS, &ifr) < 0)
- error ("Can't get interface flags for %s: %m",
- ifr.ifr_name);
-
- /* Skip loopback, point-to-point and down interfaces,
- except don't skip down interfaces if we're trying to
- get a list of configurable interfaces. */
- if ((ifr.ifr_flags & IFF_LOOPBACK) ||
-#ifdef IFF_POINTOPOINT
- (ifr.ifr_flags & IFF_POINTOPOINT) ||
-#endif
- (!(ifr.ifr_flags & IFF_UP) &&
- state != DISCOVER_UNCONFIGURED))
- continue;
-
- /* See if we've seen an interface that matches this one. */
- for (tmp = interfaces; tmp; tmp = tmp -> next)
- if (!strcmp (tmp -> name, ifp -> ifr_name))
- break;
-
- /* If there isn't already an interface by this name,
- allocate one. */
- if (!tmp) {
- tmp = ((struct interface_info *)
- dmalloc (sizeof *tmp, "discover_interfaces"));
- if (!tmp)
- error ("Insufficient memory to %s %s",
- "record interface", ifp -> ifr_name);
- strcpy (tmp -> name, ifp -> ifr_name);
- tmp -> next = interfaces;
- tmp -> flags = ir;
- interfaces = tmp;
- }
-
- /* If we have the capability, extract link information
- and record it in a linked list. */
-#ifdef AF_LINK
- if (ifp -> ifr_addr.sa_family == AF_LINK) {
- struct sockaddr_dl *foo = ((struct sockaddr_dl *)
- (&ifp -> ifr_addr));
-#if defined (HAVE_SIN_LEN)
- tmp -> hw_address.hlen = foo -> sdl_alen;
-#else
- tmp -> hw_address.hlen = 6; /* XXX!!! */
-#endif
- tmp -> hw_address.htype = HTYPE_ETHER; /* XXX */
- memcpy (tmp -> hw_address.haddr,
- LLADDR (foo), tmp -> hw_address.hlen);
- } else
-#endif /* AF_LINK */
-
- if (ifp -> ifr_addr.sa_family == AF_INET) {
- struct iaddr addr;
-
-#if defined (SIOCGIFHWADDR) && !defined (AF_LINK)
- struct ifreq ifr;
- struct sockaddr sa;
- int b, sk;
-
- /* Read the hardware address from this interface. */
- ifr = *ifp;
- if (ioctl (sock, SIOCGIFHWADDR, &ifr) < 0)
- error ("Can't get hardware address for %s: %m",
- ifr.ifr_name);
-
- sa = *(struct sockaddr *)&ifr.ifr_hwaddr;
-
- switch (sa.sa_family) {
-#ifdef ARPHRD_LOOPBACK
- case ARPHRD_LOOPBACK:
- /* ignore loopback interface */
- break;
-#endif
-
- case ARPHRD_ETHER:
- tmp -> hw_address.hlen = 6;
- tmp -> hw_address.htype = ARPHRD_ETHER;
- memcpy (tmp -> hw_address.haddr,
- sa.sa_data, 6);
- break;
-
-#ifndef ARPHRD_IEEE802
-# define ARPHRD_IEEE802 HTYPE_IEEE802
-#endif
- case ARPHRD_IEEE802:
- tmp -> hw_address.hlen = 6;
- tmp -> hw_address.htype = ARPHRD_IEEE802;
- memcpy (tmp -> hw_address.haddr,
- sa.sa_data, 6);
- break;
-
-#ifdef ARPHRD_METRICOM
- case ARPHRD_METRICOM:
- tmp -> hw_address.hlen = 6;
- tmp -> hw_address.htype = ARPHRD_METRICOM;
- memcpy (tmp -> hw_address.haddr,
- sa.sa_data, 6);
-
- break;
-#endif
-
- default:
- error ("%s: unknown hardware address type %d",
- ifr.ifr_name, sa.sa_family);
- }
-#endif /* defined (SIOCGIFHWADDR) && !defined (AF_LINK) */
-
- /* Get a pointer to the address... */
- memcpy (&foo, &ifp -> ifr_addr,
- sizeof ifp -> ifr_addr);
-
- /* We don't want the loopback interface. */
- if (foo.sin_addr.s_addr == htonl (INADDR_LOOPBACK))
- continue;
-
-
- /* If this is the first real IP address we've
- found, keep a pointer to ifreq structure in
- which we found it. */
- if (!tmp -> ifp) {
- struct ifreq *tif;
-#ifdef HAVE_SA_LEN
- int len = ((sizeof ifp -> ifr_name) +
- ifp -> ifr_addr.sa_len);
-#else
- int len = sizeof *ifp;
-#endif
- tif = (struct ifreq *)malloc (len);
- if (!tif)
- error ("no space to remember ifp.");
- memcpy (tif, ifp, len);
- tmp -> ifp = tif;
- tmp -> primary_address = foo.sin_addr;
- }
-
- /* Grab the address... */
- addr.len = 4;
- memcpy (addr.iabuf, &foo.sin_addr.s_addr,
- addr.len);
-
- /* If there's a registered subnet for this address,
- connect it together... */
- if ((subnet = find_subnet (addr))) {
- /* If this interface has multiple aliases
- on the same subnet, ignore all but the
- first we encounter. */
- if (!subnet -> interface) {
- subnet -> interface = tmp;
- subnet -> interface_address = addr;
- } else if (subnet -> interface != tmp) {
- warn ("Multiple %s %s: %s %s",
- "interfaces match the",
- "same subnet",
- subnet -> interface -> name,
- tmp -> name);
- }
- share = subnet -> shared_network;
- if (tmp -> shared_network &&
- tmp -> shared_network != share) {
- warn ("Interface %s matches %s",
- tmp -> name,
- "multiple shared networks");
- } else {
- tmp -> shared_network = share;
- }
-
- if (!share -> interface) {
- share -> interface = tmp;
- } else if (share -> interface != tmp) {
- warn ("Multiple %s %s: %s %s",
- "interfaces match the",
- "same shared network",
- share -> interface -> name,
- tmp -> name);
- }
- }
- }
- }
-
- /* If we're just trying to get a list of interfaces that we might
- be able to configure, we can quit now. */
- if (state == DISCOVER_UNCONFIGURED)
- return;
-
- /* Weed out the interfaces that did not have IP addresses. */
- last = (struct interface_info *)0;
- for (tmp = interfaces; tmp; tmp = next) {
- next = tmp -> next;
- if ((tmp -> flags & INTERFACE_AUTOMATIC) &&
- state == DISCOVER_REQUESTED)
- tmp -> flags &= ~(INTERFACE_AUTOMATIC |
- INTERFACE_REQUESTED);
- if (!tmp -> ifp || !(tmp -> flags & INTERFACE_REQUESTED)) {
- if ((tmp -> flags & INTERFACE_REQUESTED) != ir)
- error ("%s: not found", tmp -> name);
- if (!last)
- interfaces = interfaces -> next;
- else
- last -> next = tmp -> next;
-
- /* Remember the interface in case we need to know
- about it later. */
- tmp -> next = dummy_interfaces;
- dummy_interfaces = tmp;
- continue;
- }
- last = tmp;
-
- memcpy (&foo, &tmp -> ifp -> ifr_addr,
- sizeof tmp -> ifp -> ifr_addr);
-
- /* We must have a subnet declaration for each interface. */
- if (!tmp -> shared_network && (state == DISCOVER_SERVER))
- error ("No subnet declaration for %s (%s).",
- tmp -> name, inet_ntoa (foo.sin_addr));
-
- /* Find subnets that don't have valid interface
- addresses... */
- for (subnet = (tmp -> shared_network
- ? tmp -> shared_network -> subnets
- : (struct subnet *)0);
- subnet; subnet = subnet -> next_sibling) {
- if (!subnet -> interface_address.len) {
- /* Set the interface address for this subnet
- to the first address we found. */
- subnet -> interface_address.len = 4;
- memcpy (subnet -> interface_address.iabuf,
- &foo.sin_addr.s_addr, 4);
- }
- }
-
- /* Register the interface... */
- if_register_receive (tmp);
- if_register_send (tmp);
- }
-
- /* Now register all the remaining interfaces as protocols. */
- for (tmp = interfaces; tmp; tmp = tmp -> next)
- add_protocol (tmp -> name, tmp -> rfdesc, got_one, tmp);
-
- close (sock);
-
-#ifdef USE_FALLBACK
- strcpy (fallback_interface.name, "fallback");
- fallback_interface.shared_network = &fallback_network;
- fallback_network.name = "fallback-net";
- if_register_fallback (&fallback_interface);
- add_protocol ("fallback", fallback_interface.wfdesc,
- fallback_discard, &fallback_interface);
-#endif
-}
-
-void reinitialize_interfaces ()
-{
- struct interface_info *ip;
-
- for (ip = interfaces; ip; ip = ip -> next) {
- if_reinitialize_receive (ip);
- if_reinitialize_send (ip);
- }
-
-#ifdef USE_FALLBACK
- if_reinitialize_fallback (&fallback_interface);
-#endif
-
- interfaces_invalidated = 1;
-}
+int interfaces_invalidated;
#ifdef USE_POLL
/* Wait for packets to come in using poll(). Anyway, when a packet
}
#endif /* USE_POLL */
-static void got_one (l)
- struct protocol *l;
-{
- struct sockaddr_in from;
- struct hardware hfrom;
- struct iaddr ifrom;
- int result;
- union {
- unsigned char packbuf [4095]; /* Packet input buffer.
- Must be as large as largest
- possible MTU. */
- struct dhcp_packet packet;
- } u;
- struct interface_info *ip = l -> local;
-
- if ((result =
- receive_packet (ip, u.packbuf, sizeof u, &from, &hfrom)) < 0) {
- warn ("receive_packet failed on %s: %m", ip -> name);
- return;
- }
- if (result == 0)
- return;
-
- if (bootp_packet_handler) {
- ifrom.len = 4;
- memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
-
- (*bootp_packet_handler) (ip, &u.packet, result,
- from.sin_port, ifrom, &hfrom);
- }
-}
-
int locate_network (packet)
struct packet *packet;
{
projects / thirdparty / dhcp.git / commitdiff
