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 "asm/types.h"
25 #include "linux/netlink.h"
26 #include "linux/rtnetlink.h"
27 #include "lib/async_req/async_sock.h"
29 struct addrchange_context {
34 static int addrchange_context_destructor(struct addrchange_context *c);
36 NTSTATUS addrchange_context_create(TALLOC_CTX *mem_ctx,
37 struct addrchange_context **pctx)
39 struct addrchange_context *ctx;
40 struct sockaddr_nl addr;
44 ctx = talloc(mem_ctx, struct addrchange_context);
46 return NT_STATUS_NO_MEMORY;
49 ctx->sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
50 if (ctx->sock == -1) {
51 status = map_nt_error_from_unix(errno);
54 talloc_set_destructor(ctx, addrchange_context_destructor);
57 * We're interested in address changes
60 addr.nl_family = AF_NETLINK;
61 addr.nl_groups = RTMGRP_IPV6_IFADDR | RTMGRP_IPV4_IFADDR;
63 res = bind(ctx->sock, (struct sockaddr *)(void *)&addr, sizeof(addr));
65 status = map_nt_error_from_unix(errno);
76 static int addrchange_context_destructor(struct addrchange_context *c)
85 struct addrchange_state {
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);
108 state->fromaddr_len = sizeof(state->fromaddr);
110 subreq = recvfrom_send(state, ev, ctx->sock,
111 state->buf, sizeof(state->buf), 0,
112 &state->fromaddr, &state->fromaddr_len);
113 if (tevent_req_nomem(subreq, req)) {
114 return tevent_req_post(req, ev);
116 tevent_req_set_callback(subreq, addrchange_done, req);
120 static void addrchange_done(struct tevent_req *subreq)
122 struct tevent_req *req = tevent_req_callback_data(
123 subreq, struct tevent_req);
124 struct addrchange_state *state = tevent_req_data(
125 req, struct addrchange_state);
127 struct ifaddrmsg *ifa;
134 received = recvfrom_recv(subreq, &err);
136 if (received == -1) {
137 DEBUG(10, ("recvfrom returned %s\n", strerror(errno)));
138 tevent_req_nterror(req, map_nt_error_from_unix(err));
141 if (received < sizeof(struct nlmsghdr)) {
142 DEBUG(10, ("received %d, expected at least %d\n",
143 (int)received, (int)sizeof(struct nlmsghdr)));
144 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
148 h = (struct nlmsghdr *)state->buf;
149 if (h->nlmsg_len < sizeof(struct nlmsghdr)) {
150 DEBUG(10, ("nlmsg_len=%d, expected at least %d\n",
151 (int)h->nlmsg_len, (int)sizeof(struct nlmsghdr)));
152 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
155 if (h->nlmsg_len > received) {
156 DEBUG(10, ("nlmsg_len=%d, expected at most %d\n",
157 (int)h->nlmsg_len, (int)received));
158 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
161 switch (h->nlmsg_type) {
163 state->type = ADDRCHANGE_ADD;
166 state->type = ADDRCHANGE_DEL;
169 DEBUG(10, ("Got unexpected type %d\n", h->nlmsg_type));
170 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
174 if (h->nlmsg_len < sizeof(struct nlmsghdr)+sizeof(struct ifaddrmsg)) {
175 DEBUG(10, ("nlmsg_len=%d, expected at least %d\n",
177 (int)(sizeof(struct nlmsghdr)
178 +sizeof(struct ifaddrmsg))));
179 tevent_req_nterror(req, NT_STATUS_UNEXPECTED_IO_ERROR);
183 ifa = (struct ifaddrmsg *)NLMSG_DATA(h);
185 state->addr.ss_family = ifa->ifa_family;
188 len = h->nlmsg_len - sizeof(struct nlmsghdr) + sizeof(struct ifaddrmsg);
192 for (rta = IFA_RTA(ifa); RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
194 if ((rta->rta_type != IFA_LOCAL)
195 && (rta->rta_type != IFA_ADDRESS)) {
199 switch (ifa->ifa_family) {
201 struct sockaddr_in *v4_addr;
202 v4_addr = (struct sockaddr_in *)(void *)&state->addr;
204 if (RTA_PAYLOAD(rta) != sizeof(uint32_t)) {
207 v4_addr->sin_addr.s_addr = *(uint32_t *)RTA_DATA(rta);
212 struct sockaddr_in6 *v6_addr;
213 v6_addr = (struct sockaddr_in6 *)(void *)&state->addr;
215 if (RTA_PAYLOAD(rta) !=
216 sizeof(v6_addr->sin6_addr.s6_addr)) {
219 memcpy(v6_addr->sin6_addr.s6_addr, RTA_DATA(rta),
220 sizeof(v6_addr->sin6_addr.s6_addr));
228 tevent_req_nterror(req, NT_STATUS_INVALID_ADDRESS);
232 tevent_req_done(req);
235 NTSTATUS addrchange_recv(struct tevent_req *req, enum addrchange_type *type,
236 struct sockaddr_storage *addr)
238 struct addrchange_state *state = tevent_req_data(
239 req, struct addrchange_state);
242 if (tevent_req_is_nterror(req, &status)) {
253 NTSTATUS addrchange_context_create(TALLOC_CTX *mem_ctx,
254 struct addrchange_context **pctx)
256 return NT_STATUS_NOT_SUPPORTED;
259 struct tevent_req *addrchange_send(TALLOC_CTX *mem_ctx,
260 struct tevent_context *ev,
261 struct addrchange_context *ctx)
266 NTSTATUS addrchange_recv(struct tevent_req *req, enum addrchange_type *type,
267 struct sockaddr_storage *addr)
269 return NT_STATUS_NOT_IMPLEMENTED;