1 /* dnsmasq is Copyright (c) 2000-2009 Simon Kelley
52     if ((daemon->netlinkfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) != -1) {  in netlink_init()
53         if (bind(daemon->netlinkfd, (struct sockaddr*) &addr, sizeof(addr)) == -1) {  in netlink_init()
56                 bind(daemon->netlinkfd, (struct sockaddr*) &addr, sizeof(addr)) == -1)  in netlink_init()
57                 daemon->netlinkfd = -1;  in netlink_init()
61     if (daemon->netlinkfd == -1 ||  in netlink_init()
62         getsockname(daemon->netlinkfd, (struct sockaddr*) &addr, &slen) == 1)  in netlink_init()
86 …      while ((rc = recvmsg(daemon->netlinkfd, &msg, MSG_PEEK | MSG_TRUNC)) == -1 && errno == EINTR)  in netlink_recv()
90         if (rc != -1 && (msg.msg_flags & MSG_TRUNC)) {  in netlink_recv()
101         while ((rc = recvmsg(daemon->netlinkfd, &msg, 0)) == -1 && errno == EINTR)  in netlink_recv()
105         if (rc == -1 || nladdr.nl_pid == 0) break;  in netlink_recv()
110         rc = -1;  in netlink_recv()
143     while ((len = sendto(daemon->netlinkfd, (void*) &req, sizeof(req), 0, (struct sockaddr*) &addr,  in iface_enumerate()
144                          sizeof(addr))) == -1 &&  in iface_enumerate()
148     if (len == -1) return 0;  in iface_enumerate()
151         if ((len = netlink_recv()) == -1) {  in iface_enumerate()
160             if (h->nlmsg_seq != seq || h->nlmsg_pid != netlink_pid)  in iface_enumerate()
162             else if (h->nlmsg_type == NLMSG_ERROR)  in iface_enumerate()
164             else if (h->nlmsg_type == NLMSG_DONE) {  in iface_enumerate()
172             } else if (h->nlmsg_type == RTM_NEWADDR) {  in iface_enumerate()
175                 unsigned int len1 = h->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa));  in iface_enumerate()
177                 if (ifa->ifa_family == AF_INET) {  in iface_enumerate()
180                     netmask.s_addr = htonl(0xffffffff << (32 - ifa->ifa_prefixlen));  in iface_enumerate()
185                         if (rta->rta_type == IFA_LOCAL)  in iface_enumerate()
187                         else if (rta->rta_type == IFA_BROADCAST)  in iface_enumerate()
194                         if (!((*ipv4_callback)(addr, ifa->ifa_index, netmask, broadcast, parm)))  in iface_enumerate()
198                 else if (ifa->ifa_family == AF_INET6) {  in iface_enumerate()
201                         if (rta->rta_type == IFA_ADDRESS) addrp = ((struct in6_addr*) (rta + 1));  in iface_enumerate()
207                         if (!((*ipv6_callback)(addrp, ifa->ifa_index, ifa->ifa_index, parm)))  in iface_enumerate()
221     if ((flags = fcntl(daemon->netlinkfd, F_GETFL)) == -1 ||  in netlink_multicast()
222         fcntl(daemon->netlinkfd, F_SETFL, flags | O_NONBLOCK) == -1)  in netlink_multicast()
225     if ((len = netlink_recv()) != -1) {  in netlink_multicast()
227             if (h->nlmsg_type == NLMSG_ERROR)  in netlink_multicast()
233     /* restore non-blocking status */  in netlink_multicast()
234     fcntl(daemon->netlinkfd, F_SETFL, flags);  in netlink_multicast()
240     if (err->error != 0)  in nl_err()
241         my_syslog(LOG_ERR, _("netlink returns error: %s"), strerror(-(err->error)));  in nl_err()
245    If this happens and we still have a DNS packet in the buffer, we re-send it.
247    a DNS query, which then gets lost. By re-sending, we can avoid the lookup
250     if (h->nlmsg_pid == 0 && h->nlmsg_type == RTM_NEWROUTE) {  in nl_routechange()
254         if (rtm->rtm_type != RTN_UNICAST || rtm->rtm_scope != RT_SCOPE_LINK) return;  in nl_routechange()
256         /* Force re-reading resolv file right now, for luck. */  in nl_routechange()
257         daemon->last_resolv = 0;  in nl_routechange()
259         if (daemon->srv_save) {  in nl_routechange()
260             if (daemon->srv_save->sfd)  in nl_routechange()
261                 fd = daemon->srv_save->sfd->fd;  in nl_routechange()
262             else if (daemon->rfd_save && daemon->rfd_save->refcount != 0)  in nl_routechange()
263                 fd = daemon->rfd_save->fd;  in nl_routechange()
267             while (sendto(fd, daemon->packet, daemon->packet_len, 0, &daemon->srv_save->addr.sa,  in nl_routechange()
268                           sa_len(&daemon->srv_save->addr)) == -1 &&  in nl_routechange()