NetlinkEvent.cpp revision 3d40729054803fae1c4d4bb5ac7554665a132b26 
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#include <stdlib.h>
17#include <string.h>
18
19#define LOG_TAG "NetlinkEvent"
20#include <cutils/log.h>
21
22#include <sysutils/NetlinkEvent.h>
23
24const int NetlinkEvent::NlActionUnknown = 0;
25const int NetlinkEvent::NlActionAdd = 1;
26const int NetlinkEvent::NlActionRemove = 2;
27const int NetlinkEvent::NlActionChange = 3;
28
29NetlinkEvent::NetlinkEvent() {
30    mAction = NlActionUnknown;
31}
32
33NetlinkEvent::~NetlinkEvent() {
34    int i;
35    if (mPath)
36        free(mPath);
37    if (mSubsystem)
38        free(mSubsystem);
39    for (i = 0; i < NL_PARAMS_MAX; i++) {
40        if (!mParams[i])
41            break;
42        free(mParams[i]);
43    }
44}
45
46bool NetlinkEvent::decode(char *buffer, int size) {
47    char *s = buffer;
48    char *end;
49    int param_idx = 0;
50    int i;
51    int first = 1;
52
53    end = s + size;
54    while (s < end) {
55        if (first) {
56            char *p;
57            for (p = s; *p != '@'; p++);
58            p++;
59            mPath = strdup(p);
60            first = 0;
61        } else {
62            if (!strncmp(s, "ACTION=", strlen("ACTION="))) {
63                char *a = s + strlen("ACTION=");
64                if (!strcmp(a, "add"))
65                    mAction = NlActionAdd;
66                else if (!strcmp(a, "remove"))
67                    mAction = NlActionRemove;
68                else if (!strcmp(a, "change"))
69                    mAction = NlActionChange;
70            } else if (!strncmp(s, "SEQNUM=", strlen("SEQNUM=")))
71                mSeq = atoi(s + strlen("SEQNUM="));
72            else if (!strncmp(s, "SUBSYSTEM=", strlen("SUBSYSTEM=")))
73                mSubsystem = strdup(s + strlen("SUBSYSTEM="));
74            else
75                mParams[param_idx++] = strdup(s);
76        }
77        s+= strlen(s) + 1;
78    }
79    return true;
80}
81
82const char *NetlinkEvent::findParam(const char *paramName) {
83    int i;
84
85    for (i = 0; i < NL_PARAMS_MAX; i++) {
86        if (!mParams[i])
87            break;
88        if (!strncmp(mParams[i], paramName, strlen(paramName)))
89            return &mParams[i][strlen(paramName) + 1];
90    }
91
92    LOGE("NetlinkEvent::FindParam(): Parameter '%s' not found", paramName);
93    return NULL;
94}
95