NetlinkHandler.cpp revision c79bcc491f01b4d7956d7bd01f0e912e22307f41 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdarg.h>
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21#include <errno.h>
22
23#define LOG_TAG "Netd"
24
25#include <cutils/log.h>
26
27#include <sysutils/NetlinkEvent.h>
28#include "NetlinkHandler.h"
29#include "NetlinkManager.h"
30#include "ResponseCode.h"
31
32NetlinkHandler::NetlinkHandler(NetlinkManager *nm, int listenerSocket,
33                               int format) :
34                        NetlinkListener(listenerSocket, format) {
35    mNm = nm;
36}
37
38NetlinkHandler::~NetlinkHandler() {
39}
40
41int NetlinkHandler::start() {
42    return this->startListener();
43}
44
45int NetlinkHandler::stop() {
46    return this->stopListener();
47}
48
49void NetlinkHandler::onEvent(NetlinkEvent *evt) {
50    const char *subsys = evt->getSubsystem();
51    if (!subsys) {
52        ALOGW("No subsystem found in netlink event");
53        return;
54    }
55
56    if (!strcmp(subsys, "net")) {
57        int action = evt->getAction();
58        const char *iface = evt->findParam("INTERFACE");
59
60        if (action == evt->NlActionAdd) {
61            notifyInterfaceAdded(iface);
62        } else if (action == evt->NlActionRemove) {
63            notifyInterfaceRemoved(iface);
64        } else if (action == evt->NlActionChange) {
65            evt->dump();
66            notifyInterfaceChanged("nana", true);
67        } else if (action == evt->NlActionLinkUp) {
68            notifyInterfaceLinkChanged(iface, true);
69        } else if (action == evt->NlActionLinkDown) {
70            notifyInterfaceLinkChanged(iface, false);
71        } else if (action == evt->NlActionAddressUpdated ||
72                   action == evt->NlActionAddressRemoved) {
73            const char *address = evt->findParam("ADDRESS");
74            const char *flags = evt->findParam("FLAGS");
75            const char *scope = evt->findParam("SCOPE");
76            if (iface && flags && scope) {
77                notifyAddressChanged(action, address, iface, flags, scope);
78            }
79        } else if (action == evt->NlActionRdnss) {
80            const char *lifetime = evt->findParam("LIFETIME");
81            const char *servers = evt->findParam("SERVERS");
82            if (lifetime && servers) {
83                notifyInterfaceDnsServers(iface, lifetime, servers);
84            }
85        }
86
87    } else if (!strcmp(subsys, "qlog")) {
88        const char *alertName = evt->findParam("ALERT_NAME");
89        const char *iface = evt->findParam("INTERFACE");
90        notifyQuotaLimitReached(alertName, iface);
91
92    } else if (!strcmp(subsys, "xt_idletimer")) {
93        int action = evt->getAction();
94        const char *label = evt->findParam("INTERFACE");
95        const char *state = evt->findParam("STATE");
96        if (state)
97            notifyInterfaceClassActivity(label, !strcmp("active", state));
98
99#if !LOG_NDEBUG
100    } else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) {
101        /* It is not a VSYNC or a backlight event */
102        ALOGV("unexpected event from subsystem %s", subsys);
103#endif
104    }
105}
106
107void NetlinkHandler::notify(int code, const char *format, ...) {
108    char *msg;
109    va_list args;
110    va_start(args, format);
111    if (vasprintf(&msg, format, args) >= 0) {
112        mNm->getBroadcaster()->sendBroadcast(code, msg, false);
113        free(msg);
114    } else {
115        SLOGE("Failed to send notification: vasprintf: %s", strerror(errno));
116    }
117    va_end(args);
118}
119
120void NetlinkHandler::notifyInterfaceAdded(const char *name) {
121    notify(ResponseCode::InterfaceChange, "Iface added %s", name);
122}
123
124void NetlinkHandler::notifyInterfaceRemoved(const char *name) {
125    notify(ResponseCode::InterfaceChange, "Iface removed %s", name);
126}
127
128void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) {
129    notify(ResponseCode::InterfaceChange,
130           "Iface changed %s %s", name, (isUp ? "up" : "down"));
131}
132
133void NetlinkHandler::notifyInterfaceLinkChanged(const char *name, bool isUp) {
134    notify(ResponseCode::InterfaceChange,
135           "Iface linkstate %s %s", name, (isUp ? "up" : "down"));
136}
137
138void NetlinkHandler::notifyQuotaLimitReached(const char *name, const char *iface) {
139    notify(ResponseCode::BandwidthControl, "limit alert %s %s", name, iface);
140}
141
142void NetlinkHandler::notifyInterfaceClassActivity(const char *name,
143                                                  bool isActive) {
144    notify(ResponseCode::InterfaceClassActivity,
145           "IfaceClass %s %s", isActive ? "active" : "idle", name);
146}
147
148void NetlinkHandler::notifyAddressChanged(int action, const char *addr,
149                                          const char *iface, const char *flags,
150                                          const char *scope) {
151    notify(ResponseCode::InterfaceAddressChange,
152           "Address %s %s %s %s %s",
153           (action == NetlinkEvent::NlActionAddressUpdated) ?
154           "updated" : "removed", addr, iface, flags, scope);
155}
156
157void NetlinkHandler::notifyInterfaceDnsServers(const char *iface,
158                                               const char *lifetime,
159                                               const char *servers) {
160    notify(ResponseCode::InterfaceDnsInfo, "DnsInfo servers %s %s %s",
161           iface, lifetime, servers);
162}
163