Lines Matching defs:*
0 /* $Id$ */
4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 USA.
22 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
26 #include <sys/socket.h>
27 #include <errno.h>
28 #include <string.h>
29 #include <unistd.h>
30 #include <arpa/inet.h>
32 #include <linux/types.h>
33 #include <linux/netlink.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/if.h>
36 #include <linux/if_arp.h>
38 #include <libdaemon/dlog.h>
40 #include <avahi-common/llist.h>
41 #include <avahi-common/malloc.h>
43 #ifndef IFLA_RTA
44 #include <linux/if_addr.h>
45 #define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
46 #endif
48 #ifndef IFA_RTA
49 #include <linux/if_addr.h>
50 #define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
51 #endif
53 #include "iface.h"
55 static int fd = -1;
56 static int ifindex = -1;
58 typedef struct Address Address;
60 struct Address {
61 uint32_t address;
62 AVAHI_LLIST_FIELDS(Address, addresses);
65 AVAHI_LLIST_HEAD(Address, addresses) = NULL;
67 int iface_init(int i) {
68 struct sockaddr_nl addr;
69 int on = 1;
71 if ((fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
72 daemon_log(LOG_ERR, "socket(PF_NETLINK): %s", strerror(errno));
73 goto fail;
76 memset(&addr, 0, sizeof(addr));
77 addr.nl_family = AF_NETLINK;
78 addr.nl_groups = RTMGRP_LINK|RTMGRP_IPV4_IFADDR;
79 addr.nl_pid = getpid();
81 if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
82 daemon_log(LOG_ERR, "bind(): %s", strerror(errno));
83 goto fail;
86 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
87 daemon_log(LOG_ERR, "SO_PASSCRED: %s", strerror(errno));
88 goto fail;
91 ifindex = i;
93 return fd;
95 fail:
96 if (fd >= 0) {
97 close(fd);
98 fd = -1;
101 return -1;
104 static int process_nlmsg(struct nlmsghdr *n) {
105 assert(n);
107 if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
108 /* A link appeared or was removed */
110 struct ifinfomsg *ifi;
111 ifi = NLMSG_DATA(n);
113 if (ifi->ifi_family != AF_UNSPEC || (int) ifi->ifi_index != ifindex)
114 return 0;
116 if (n->nlmsg_type == RTM_DELLINK) {
117 daemon_log(LOG_ERR, "Interface vanished.");
118 return -1;
121 assert(n->nlmsg_type == RTM_NEWLINK);
123 if ((ifi->ifi_flags & IFF_LOOPBACK) ||
124 (ifi->ifi_flags & IFF_NOARP) ||
125 ifi->ifi_type != ARPHRD_ETHER) {
126 daemon_log(LOG_ERR, "Interface not suitable.");
127 return -1;
130 } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
132 /* An address was added or removed */
134 struct rtattr *a = NULL;
135 struct ifaddrmsg *ifa;
136 int l;
137 uint32_t address = 0;
138 Address *i;
140 ifa = NLMSG_DATA(n);
142 if (ifa->ifa_family != AF_INET || (int) ifa->ifa_index != ifindex)
143 return 0;
145 l = NLMSG_PAYLOAD(n, sizeof(*ifa));
146 a = IFLA_RTA(ifa);
148 while(RTA_OK(a, l)) {
150 switch(a->rta_type) {
151 case IFA_LOCAL:
152 case IFA_ADDRESS:
153 assert(RTA_PAYLOAD(a) == 4);
154 memcpy(&address, RTA_DATA(a), sizeof(uint32_t));
155 break;
158 a = RTA_NEXT(a, l);
161 if (!address || is_ll_address(address))
162 return 0;
164 for (i = addresses; i; i = i->addresses_next)
165 if (i->address == address)
166 break;
168 if (n->nlmsg_type == RTM_DELADDR && i) {
169 AVAHI_LLIST_REMOVE(Address, addresses, addresses, i);
170 avahi_free(i);
171 } if (n->nlmsg_type == RTM_NEWADDR && !i) {
172 i = avahi_new(Address, 1);
173 i->address = address;
174 AVAHI_LLIST_PREPEND(Address, addresses, addresses, i);
178 return 0;
181 static int process_response(int wait_for_done, unsigned seq) {
182 assert(fd >= 0);
184 do {
185 size_t bytes;
186 ssize_t r;
187 char replybuf[8*1024];
188 char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
189 struct msghdr msghdr;
190 struct cmsghdr *cmsghdr;
191 struct ucred *ucred;
192 struct iovec iov;
193 struct nlmsghdr *p = (struct nlmsghdr *) replybuf;
195 memset(&iov, 0, sizeof(iov));
196 iov.iov_base = replybuf;
197 iov.iov_len = sizeof(replybuf);
199 memset(&msghdr, 0, sizeof(msghdr));
200 msghdr.msg_name = (void*) NULL;
201 msghdr.msg_namelen = 0;
202 msghdr.msg_iov = &iov;
203 msghdr.msg_iovlen = 1;
204 msghdr.msg_control = cred_msg;
205 msghdr.msg_controllen = sizeof(cred_msg);
206 msghdr.msg_flags = 0;
208 if ((r = recvmsg(fd, &msghdr, 0)) < 0) {
209 daemon_log(LOG_ERR, "recvmsg() failed: %s", strerror(errno));
210 return -1;
213 if (!(cmsghdr = CMSG_FIRSTHDR(&msghdr)) || cmsghdr->cmsg_type != SCM_CREDENTIALS) {
214 daemon_log(LOG_WARNING, "No sender credentials received, ignoring data.");
215 return -1;
218 ucred = (struct ucred*) CMSG_DATA(cmsghdr);
220 if (ucred->uid != 0)
221 return -1;
223 bytes = (size_t) r;
225 for (; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
227 if (!NLMSG_OK(p, bytes) || bytes < sizeof(struct nlmsghdr) || bytes < p->nlmsg_len) {
228 daemon_log(LOG_ERR, "Netlink packet too small.");
229 return -1;
232 if (p->nlmsg_type == NLMSG_DONE && wait_for_done && p->nlmsg_seq == seq && (pid_t) p->nlmsg_pid == getpid())
233 return 0;
235 if (p->nlmsg_type == NLMSG_ERROR) {
236 struct nlmsgerr *e = (struct nlmsgerr *) NLMSG_DATA (p);
238 if (e->error) {
239 daemon_log(LOG_ERR, "Netlink error: %s", strerror(-e->error));
240 return -1;
244 if (process_nlmsg(p) < 0)
245 return -1;
247 } while (wait_for_done);
249 return 0;
252 int iface_get_initial_state(State *state) {
253 struct nlmsghdr *n;
254 struct ifinfomsg *ifi;
255 struct ifaddrmsg *ifa;
256 uint8_t req[1024];
257 int seq = 0;
259 assert(fd >= 0);
260 assert(state);
262 memset(&req, 0, sizeof(req));
263 n = (struct nlmsghdr*) req;
264 n->nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
265 n->nlmsg_type = RTM_GETLINK;
266 n->nlmsg_seq = seq;
267 n->nlmsg_flags = NLM_F_MATCH|NLM_F_REQUEST|NLM_F_ACK;
268 n->nlmsg_pid = 0;
270 ifi = NLMSG_DATA(n);
271 ifi->ifi_family = AF_UNSPEC;
272 ifi->ifi_change = -1;
274 if (send(fd, n, n->nlmsg_len, 0) < 0) {
275 daemon_log(LOG_ERR, "send(): %s", strerror(errno));
276 return -1;
279 if (process_response(1, 0) < 0)
280 return -1;
282 n->nlmsg_type = RTM_GETADDR;
283 n->nlmsg_len = NLMSG_LENGTH(sizeof(*ifa));
284 n->nlmsg_seq = ++seq;
286 ifa = NLMSG_DATA(n);
287 ifa->ifa_family = AF_INET;
288 ifa->ifa_index = ifindex;
290 if (send(fd, n, n->nlmsg_len, 0) < 0) {
291 daemon_log(LOG_ERR, "send(): %s", strerror(errno));
292 return -1;
295 if (process_response(1, seq) < 0)
296 return -1;
298 *state = addresses ? STATE_SLEEPING : STATE_START;
300 return 0;
303 int iface_process(Event *event) {
304 int b;
305 assert(fd >= 0);
307 b = !!addresses;
309 if (process_response(0, 0) < 0)
310 return -1;
312 if (b && !addresses)
313 *event = EVENT_ROUTABLE_ADDR_UNCONFIGURED;
314 else if (!b && addresses)
315 *event = EVENT_ROUTABLE_ADDR_CONFIGURED;
317 return 0;
320 void iface_done(void) {
321 Address *a;
323 if (fd >= 0) {
324 close(fd);
325 fd = -1;
328 while ((a = addresses)) {
329 AVAHI_LLIST_REMOVE(Address, addresses, addresses, a);
330 avahi_free(a);