+++ /dev/null
-/***
- This file is part of avahi.
-
- avahi is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- avahi is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
- Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with avahi; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- USA.
-***/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <string.h>
-#include <net/if.h>
-#include <errno.h>
-#include <string.h>
-
-#include <avahi-common/malloc.h>
-
-#include "log.h"
-#include "iface.h"
-#include "iface-linux.h"
-
-#ifndef IFLA_RTA
-#include <linux/if_addr.h>
-#define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
-#endif
-
-#ifndef IFA_RTA
-#include <linux/if_addr.h>
-#define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
-#endif
-
-static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
- struct nlmsghdr *n;
- struct rtgenmsg *gen;
- uint8_t req[1024];
-
- /* Issue a wild dump NETLINK request */
-
- memset(&req, 0, sizeof(req));
- n = (struct nlmsghdr*) req;
- n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
- n->nlmsg_type = type;
- n->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP;
- n->nlmsg_pid = 0;
-
- gen = NLMSG_DATA(n);
- memset(gen, 0, sizeof(struct rtgenmsg));
- gen->rtgen_family = AF_UNSPEC;
-
- return avahi_netlink_send(nl, n, ret_seq);
-}
-
-static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
- AvahiInterfaceMonitor *m = userdata;
-
- /* This routine is called for every RTNETLINK response packet */
-
- assert(m);
- assert(n);
- assert(m->osdep.netlink == nl);
-
- if (n->nlmsg_type == RTM_NEWLINK) {
-
- /* A new interface appeared or an existing one has been modified */
-
- struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
- AvahiHwInterface *hw;
- struct rtattr *a = NULL;
- size_t l;
-
- /* A (superfluous?) sanity check */
- if (ifinfomsg->ifi_family != AF_UNSPEC)
- return;
-
- /* Check whether there already is an AvahiHwInterface object
- * for this link, so that we can update its data. Note that
- * Netlink sends us an RTM_NEWLINK not only when a new
- * interface appears, but when it changes, too */
-
- if (!(hw = avahi_interface_monitor_get_hw_interface(m, ifinfomsg->ifi_index)))
-
- /* No object found, so let's create a new
- * one. avahi_hw_interface_new() will call
- * avahi_interface_new() internally twice for IPv4 and
- * IPv6, so there is no need for us to do that
- * ourselves */
- if (!(hw = avahi_hw_interface_new(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
- return; /* OOM */
-
- /* Check whether the flags of this interface are OK for us */
- hw->flags_ok =
- (ifinfomsg->ifi_flags & IFF_UP) &&
- (!m->server->config.use_iff_running || (ifinfomsg->ifi_flags & IFF_RUNNING)) &&
- !(ifinfomsg->ifi_flags & IFF_LOOPBACK) &&
- (ifinfomsg->ifi_flags & IFF_MULTICAST) &&
- (m->server->config.allow_point_to_point || !(ifinfomsg->ifi_flags & IFF_POINTOPOINT));
-
- /* Handle interface attributes */
- l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
- a = IFLA_RTA(ifinfomsg);
-
- while (RTA_OK(a, l)) {
- switch(a->rta_type) {
- case IFLA_IFNAME:
-
- /* Fill in interface name */
- avahi_free(hw->name);
- hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
- break;
-
- case IFLA_MTU:
-
- /* Fill in MTU */
- assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
- hw->mtu = *((unsigned int*) RTA_DATA(a));
- break;
-
- case IFLA_ADDRESS:
-
- /* Fill in hardware (MAC) address */
- hw->mac_address_size = RTA_PAYLOAD(a);
- if (hw->mac_address_size > AVAHI_MAC_ADDRESS_MAX)
- hw->mac_address_size = AVAHI_MAC_ADDRESS_MAX;
-
- memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
- break;
-
- default:
- ;
- }
-
- a = RTA_NEXT(a, l);
- }
-
- /* Check whether this interface is now "relevant" for us. If
- * it is Avahi will start to announce its records on this
- * interface and send out queries for subscribed records on
- * it */
- avahi_hw_interface_check_relevant(hw);
-
- /* Update any associated RRs of this interface. (i.e. the
- * _workstation._tcp record containing the MAC address) */
- avahi_hw_interface_update_rrs(hw, 0);
-
- } else if (n->nlmsg_type == RTM_DELLINK) {
-
- /* An interface has been removed */
-
- struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
- AvahiHwInterface *hw;
-
- /* A (superfluous?) sanity check */
- if (ifinfomsg->ifi_family != AF_UNSPEC)
- return;
-
- /* Get a reference to our AvahiHwInterface object of this interface */
- if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
- return;
-
- /* Free our object */
- avahi_hw_interface_free(hw, 0);
-
- } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
-
- /* An address has been added, modified or removed */
-
- struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
- AvahiInterface *i;
- struct rtattr *a = NULL;
- size_t l;
- AvahiAddress raddr, rlocal, *r;
- int raddr_valid = 0, rlocal_valid = 0;
-
- /* We are only interested in IPv4 and IPv6 */
- if (ifaddrmsg->ifa_family != AF_INET && ifaddrmsg->ifa_family != AF_INET6)
- return;
-
- /* Try to get a reference to our AvahiInterface object for the
- * interface this address is assigned to. If ther is no object
- * for this interface, we ignore this address. */
- if (!(i = avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, avahi_af_to_proto(ifaddrmsg->ifa_family))))
- return;
-
- /* Fill in address family for our new address */
- rlocal.proto = raddr.proto = avahi_af_to_proto(ifaddrmsg->ifa_family);
-
- l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
- a = IFA_RTA(ifaddrmsg);
-
- while (RTA_OK(a, l)) {
-
- switch(a->rta_type) {
-
- case IFA_ADDRESS:
-
- if ((rlocal.proto == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
- (rlocal.proto == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
- return;
-
- memcpy(rlocal.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
- rlocal_valid = 1;
-
- break;
-
- case IFA_LOCAL:
-
- /* Fill in local address data. Usually this is
- * preferable over IFA_ADDRESS if both are set,
- * since this refers to the local address of a PPP
- * link while IFA_ADDRESS refers to the other
- * end. */
-
- if ((raddr.proto == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
- (raddr.proto == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
- return;
-
- memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
- raddr_valid = 1;
-
- break;
-
- default:
- ;
- }
-
- a = RTA_NEXT(a, l);
- }
-
- /* If there was no adress attached to this message, let's quit. */
- if (rlocal_valid)
- r = &rlocal;
- else if (raddr_valid)
- r = &raddr;
- else
- return;
-
- if (n->nlmsg_type == RTM_NEWADDR) {
- AvahiInterfaceAddress *addr;
-
- /* This address is new or has been modified, so let's get an object for it */
- if (!(addr = avahi_interface_monitor_get_address(m, i, r)))
-
- /* Mmm, no object existing yet, so let's create a new one */
- if (!(addr = avahi_interface_address_new(m, i, r, ifaddrmsg->ifa_prefixlen)))
- return; /* OOM */
-
- /* Update the scope field for the address */
- addr->global_scope = ifaddrmsg->ifa_scope == RT_SCOPE_UNIVERSE || ifaddrmsg->ifa_scope == RT_SCOPE_SITE;
- addr->deprecated = !!(ifaddrmsg->ifa_flags & IFA_F_DEPRECATED);
- } else {
- AvahiInterfaceAddress *addr;
- assert(n->nlmsg_type == RTM_DELADDR);
-
- /* Try to get a reference to our AvahiInterfaceAddress object for this address */
- if (!(addr = avahi_interface_monitor_get_address(m, i, r)))
- return;
-
- /* And free it */
- avahi_interface_address_free(addr);
- }
-
- /* Avahi only considers interfaces with at least one address
- * attached relevant. Since we migh have added or removed an
- * address, let's have it check again whether the interface is
- * now relevant */
- avahi_interface_check_relevant(i);
-
- /* Update any associated RRs, like A or AAAA for our new/removed address */
- avahi_interface_update_rrs(i, 0);
-
- } else if (n->nlmsg_type == NLMSG_DONE) {
-
- /* This wild dump request ended, so let's see what we do next */
-
- if (m->osdep.list == LIST_IFACE) {
-
- /* Mmmm, interfaces have been wild dumped already, so
- * let's go on with wild dumping the addresses */
-
- if (netlink_list_items(m->osdep.netlink, RTM_GETADDR, &m->osdep.query_addr_seq) < 0) {
- avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
- m->osdep.list = LIST_DONE;
- } else
-
- /* Update state information */
- m->osdep.list = LIST_ADDR;
-
- } else
- /* We're done. Tell avahi_interface_monitor_sync() to finish. */
- m->osdep.list = LIST_DONE;
-
- if (m->osdep.list == LIST_DONE) {
-
- /* Only after this boolean variable has been set, Avahi
- * will start to announce or browse on all interfaces. It
- * is originaly set to 0, which means that relevancy
- * checks and RR updates are disabled during the wild
- * dumps. */
- m->list_complete = 1;
-
- /* So let's check if any interfaces are relevant now */
- avahi_interface_monitor_check_relevant(m);
-
- /* And update all RRs attached to any interface */
- avahi_interface_monitor_update_rrs(m, 0);
-
- /* Tell the user that the wild dump is complete */
- avahi_log_info("Network interface enumeration completed.");
- }
-
- } else if (n->nlmsg_type == NLMSG_ERROR &&
- (n->nlmsg_seq == m->osdep.query_link_seq || n->nlmsg_seq == m->osdep.query_addr_seq)) {
- struct nlmsgerr *e = NLMSG_DATA (n);
-
- /* Some kind of error happened. Let's just tell the user and
- * ignore it otherwise */
-
- if (e->error)
- avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
- }
-}
-
-int avahi_interface_monitor_init_osdep(AvahiInterfaceMonitor *m) {
- assert(m);
-
- /* Initialize our own data */
-
- m->osdep.netlink = NULL;
- m->osdep.query_addr_seq = m->osdep.query_link_seq = 0;
-
- /* Create a netlink object for us. It abstracts some things and
- * makes netlink easier to use. It will attach to the main loop
- * for us and call netlink_callback() whenever an event
- * happens. */
- if (!(m->osdep.netlink = avahi_netlink_new(m->server->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
- goto fail;
-
- /* Set the initial state. */
- m->osdep.list = LIST_IFACE;
-
- /* Start the wild dump for the interfaces */
- if (netlink_list_items(m->osdep.netlink, RTM_GETLINK, &m->osdep.query_link_seq) < 0)
- goto fail;
-
- return 0;
-
-fail:
-
- if (m->osdep.netlink) {
- avahi_netlink_free(m->osdep.netlink);
- m->osdep.netlink = NULL;
- }
-
- return -1;
-}
-
-void avahi_interface_monitor_free_osdep(AvahiInterfaceMonitor *m) {
- assert(m);
-
- if (m->osdep.netlink) {
- avahi_netlink_free(m->osdep.netlink);
- m->osdep.netlink = NULL;
- }
-}
-
-void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
- assert(m);
-
- /* Let's handle netlink events until we are done with wild
- * dumping */
-
- while (!m->list_complete)
- if (!avahi_netlink_work(m->osdep.netlink, 1) == 0)
- break;
-
- /* At this point Avahi knows about all local interfaces and
- * addresses in existance. */
-}
projects / catta / blobdiff