2 * Samba Unix/Linux SMB client library
3 * Copyright (C) Volker Lendecke 2011
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #include "lib/addrchange.h"
22 #if HAVE_LINUX_RTNETLINK_H
24 #include "linux/netlink.h"
25 #include "linux/rtnetlink.h"
26 #include "lib/async_req/async_sock.h"
28 struct addrchange_context {
32 static int addrchange_context_destructor(struct addrchange_context *c);
34 NTSTATUS addrchange_context_create(TALLOC_CTX *mem_ctx,
35 struct addrchange_context **pctx)
37 struct addrchange_context *ctx;
38 struct sockaddr_nl addr;
42 ctx = talloc(mem_ctx, struct addrchange_context);
44 return NT_STATUS_NO_MEMORY;
47 ctx->sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
48 if (ctx->sock == -1) {
49 status = map_nt_error_from_unix(errno);
52 talloc_set_destructor(ctx, addrchange_context_destructor);
55 * We're interested in address changes
58 addr.nl_family = AF_NETLINK;
59 addr.nl_groups = RTMGRP_IPV6_IFADDR | RTMGRP_IPV4_IFADDR;
61 res = bind(ctx->sock, (struct sockaddr *)(void *)&addr, sizeof(addr));
63 status = map_nt_error_from_unix(errno);
74 static int addrchange_context_destructor(struct addrchange_context *c)
83 struct addrchange_state {
84 struct tevent_context *ev;
85 struct addrchange_context *ctx;
87 struct sockaddr_storage fromaddr;
88 socklen_t fromaddr_len;
90 enum addrchange_type type;
91 struct sockaddr_storage addr;
94 static void addrchange_done(struct tevent_req *subreq);
96 struct tevent_req *addrchange_send(TALLOC_CTX *mem_ctx,
97 struct tevent_context *ev,
98 struct addrchange_context *ctx)
100 struct tevent_req *req, *subreq;
101 struct addrchange_state *state;
103 req = tevent_req_create(mem_ctx, &state, struct addrchange_state);
110 state->fromaddr_len = sizeof(state->fromaddr);
111 subreq = recvfrom_send(state, state->ev, state->ctx->sock,
112 state->buf, sizeof(state->buf), 0,
113 &state->fromaddr, &state->fromaddr_len);
114 if (tevent_req_nomem(subreq, req)) {
115 return tevent_req_post(req, state->ev);
117 tevent_req_set_callback(subreq, addrchange_done, req);
121 static void addrchange_done(struct tevent_req *subreq)
123 struct tevent_req *req = tevent_req_callback_data(
124 subreq, struct tevent_req);
125 struct addrchange_state *state = tevent_req_data(
126 req, struct addrchange_state);
128 struct ifaddrmsg *ifa;
135 received = recvfrom_recv(subreq, &err);
137 if (received == -1) {
138 DEBUG(10, ("recvfrom returned %s\n", strerror(errno)));
139 tevent_req_nterror(req, map_nt_error_from_unix(err));
142 if (received < sizeof(struct nlmsghdr)) {
143 DEBUG(10, ("received %d, expected at least %d\n",
144 (int)received, (int)sizeof(struct nlmsghdr)));
145 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
149 h = (struct nlmsghdr *)state->buf;
150 if (h->nlmsg_len < sizeof(struct nlmsghdr)) {
151 DEBUG(10, ("nlmsg_len=%d, expected at least %d\n",
152 (int)h->nlmsg_len, (int)sizeof(struct nlmsghdr)));
153 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
156 if (h->nlmsg_len > received) {
157 DEBUG(10, ("nlmsg_len=%d, expected at most %d\n",
158 (int)h->nlmsg_len, (int)received));
159 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
162 switch (h->nlmsg_type) {
164 state->type = ADDRCHANGE_ADD;
167 state->type = ADDRCHANGE_DEL;
170 DEBUG(10, ("Got unexpected type %d - ignoring\n", h->nlmsg_type));
172 state->fromaddr_len = sizeof(state->fromaddr);
173 subreq = recvfrom_send(state, state->ev, state->ctx->sock,
174 state->buf, sizeof(state->buf), 0,
175 &state->fromaddr, &state->fromaddr_len);
176 if (tevent_req_nomem(subreq, req)) {
179 tevent_req_set_callback(subreq, addrchange_done, req);
183 if (h->nlmsg_len < sizeof(struct nlmsghdr)+sizeof(struct ifaddrmsg)) {
184 DEBUG(10, ("nlmsg_len=%d, expected at least %d\n",
186 (int)(sizeof(struct nlmsghdr)
187 +sizeof(struct ifaddrmsg))));
188 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
192 ifa = (struct ifaddrmsg *)NLMSG_DATA(h);
194 state->addr.ss_family = ifa->ifa_family;
197 len = h->nlmsg_len - sizeof(struct nlmsghdr) + sizeof(struct ifaddrmsg);
201 for (rta = IFA_RTA(ifa); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
203 if ((rta->rta_type != IFA_LOCAL)
204 && (rta->rta_type != IFA_ADDRESS)) {
208 switch (ifa->ifa_family) {
210 struct sockaddr_in *v4_addr;
211 v4_addr = (struct sockaddr_in *)(void *)&state->addr;
213 if (RTA_PAYLOAD(rta) != sizeof(uint32_t)) {
216 v4_addr->sin_addr.s_addr = *(uint32_t *)RTA_DATA(rta);
221 struct sockaddr_in6 *v6_addr;
222 v6_addr = (struct sockaddr_in6 *)(void *)&state->addr;
224 if (RTA_PAYLOAD(rta) !=
225 sizeof(v6_addr->sin6_addr.s6_addr)) {
228 memcpy(v6_addr->sin6_addr.s6_addr, RTA_DATA(rta),
229 sizeof(v6_addr->sin6_addr.s6_addr));
237 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
241 tevent_req_done(req);
244 NTSTATUS addrchange_recv(struct tevent_req *req, enum addrchange_type *type,
245 struct sockaddr_storage *addr)
247 struct addrchange_state *state = tevent_req_data(
248 req, struct addrchange_state);
251 if (tevent_req_is_nterror(req, &status)) {
262 NTSTATUS addrchange_context_create(TALLOC_CTX *mem_ctx,
263 struct addrchange_context **pctx)
265 return NT_STATUS_NOT_SUPPORTED;
268 struct tevent_req *addrchange_send(TALLOC_CTX *mem_ctx,
269 struct tevent_context *ev,
270 struct addrchange_context *ctx)
275 NTSTATUS addrchange_recv(struct tevent_req *req, enum addrchange_type *type,
276 struct sockaddr_storage *addr)
278 return NT_STATUS_NOT_IMPLEMENTED;