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      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 
     24 const int NetlinkEvent::NlActionUnknown = 0;
     25 const int NetlinkEvent::NlActionAdd = 1;
     26 const int NetlinkEvent::NlActionRemove = 2;
     27 const int NetlinkEvent::NlActionChange = 3;
     28 
     29 NetlinkEvent::NetlinkEvent() {
     30     mAction = NlActionUnknown;
     31     memset(mParams, 0, sizeof(mParams));
     32     mPath = NULL;
     33     mSubsystem = NULL;
     34 }
     35 
     36 NetlinkEvent::~NetlinkEvent() {
     37     int i;
     38     if (mPath)
     39         free(mPath);
     40     if (mSubsystem)
     41         free(mSubsystem);
     42     for (i = 0; i < NL_PARAMS_MAX; i++) {
     43         if (!mParams[i])
     44             break;
     45         free(mParams[i]);
     46     }
     47 }
     48 
     49 void NetlinkEvent::dump() {
     50     int i;
     51 
     52     for (i = 0; i < NL_PARAMS_MAX; i++) {
     53         if (!mParams[i])
     54             break;
     55         SLOGD("NL param '%s'\n", mParams[i]);
     56     }
     57 }
     58 
     59 bool NetlinkEvent::decode(char *buffer, int size) {
     60     char *s = buffer;
     61     char *end;
     62     int param_idx = 0;
     63     int i;
     64     int first = 1;
     65 
     66     end = s + size;
     67     while (s < end) {
     68         if (first) {
     69             char *p;
     70             for (p = s; *p != '@'; p++);
     71             p++;
     72             mPath = strdup(p);
     73             first = 0;
     74         } else {
     75             if (!strncmp(s, "ACTION=", strlen("ACTION="))) {
     76                 char *a = s + strlen("ACTION=");
     77                 if (!strcmp(a, "add"))
     78                     mAction = NlActionAdd;
     79                 else if (!strcmp(a, "remove"))
     80                     mAction = NlActionRemove;
     81                 else if (!strcmp(a, "change"))
     82                     mAction = NlActionChange;
     83             } else if (!strncmp(s, "SEQNUM=", strlen("SEQNUM=")))
     84                 mSeq = atoi(s + strlen("SEQNUM="));
     85             else if (!strncmp(s, "SUBSYSTEM=", strlen("SUBSYSTEM=")))
     86                 mSubsystem = strdup(s + strlen("SUBSYSTEM="));
     87             else
     88                 mParams[param_idx++] = strdup(s);
     89         }
     90         s+= strlen(s) + 1;
     91     }
     92     return true;
     93 }
     94 
     95 const char *NetlinkEvent::findParam(const char *paramName) {
     96     int i;
     97 
     98     for (i = 0; i < NL_PARAMS_MAX; i++) {
     99         if (!mParams[i])
    100             break;
    101         if (!strncmp(mParams[i], paramName, strlen(paramName)))
    102             return &mParams[i][strlen(paramName) + 1];
    103     }
    104 
    105     SLOGE("NetlinkEvent::FindParam(): Parameter '%s' not found", paramName);
    106     return NULL;
    107 }
    108