NetlinkEvent.cpp revision 3311eea1d3881e6f3d6806988b7db3de0a5f68d5
1168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat/* 2168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * Copyright (C) 2008 The Android Open Source Project 3168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * 4168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * Licensed under the Apache License, Version 2.0 (the "License"); 5168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * you may not use this file except in compliance with the License. 6168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * You may obtain a copy of the License at 7168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * 8168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * http://www.apache.org/licenses/LICENSE-2.0 9168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * 10168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * Unless required by applicable law or agreed to in writing, software 11168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * distributed under the License is distributed on an "AS IS" BASIS, 12168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * See the License for the specific language governing permissions and 14168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat * limitations under the License. 15168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat */ 16168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat#include <stdlib.h> 173d40729054803fae1c4d4bb5ac7554665a132b26San Mehat#include <string.h> 18168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 19168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat#define LOG_TAG "NetlinkEvent" 20168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat#include <cutils/log.h> 21168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 22168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat#include <sysutils/NetlinkEvent.h> 23168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 24168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatconst int NetlinkEvent::NlActionUnknown = 0; 25168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatconst int NetlinkEvent::NlActionAdd = 1; 26168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatconst int NetlinkEvent::NlActionRemove = 2; 27168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatconst int NetlinkEvent::NlActionChange = 3; 28168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 29168415b822cae1f8b54ef09c41c11a9b97b87f40San MehatNetlinkEvent::NetlinkEvent() { 30168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat mAction = NlActionUnknown; 31ebfe3db361c51d9d99bf6cfd495bd16bdf815e1fSan Mehat memset(mParams, 0, sizeof(mParams)); 32ebfe3db361c51d9d99bf6cfd495bd16bdf815e1fSan Mehat mPath = NULL; 33ebfe3db361c51d9d99bf6cfd495bd16bdf815e1fSan Mehat mSubsystem = NULL; 34168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat} 35168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 36168415b822cae1f8b54ef09c41c11a9b97b87f40San MehatNetlinkEvent::~NetlinkEvent() { 37168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat int i; 38168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat if (mPath) 39168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat free(mPath); 40168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat if (mSubsystem) 41168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat free(mSubsystem); 42168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat for (i = 0; i < NL_PARAMS_MAX; i++) { 43168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat if (!mParams[i]) 44168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat break; 45168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat free(mParams[i]); 46168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat } 47168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat} 48168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 49d674413ff460afe1da049e54bb7a489132799749San Mehatvoid NetlinkEvent::dump() { 50d674413ff460afe1da049e54bb7a489132799749San Mehat int i; 51d674413ff460afe1da049e54bb7a489132799749San Mehat 52d674413ff460afe1da049e54bb7a489132799749San Mehat for (i = 0; i < NL_PARAMS_MAX; i++) { 53d674413ff460afe1da049e54bb7a489132799749San Mehat if (!mParams[i]) 54d674413ff460afe1da049e54bb7a489132799749San Mehat break; 557e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("NL param '%s'\n", mParams[i]); 56d674413ff460afe1da049e54bb7a489132799749San Mehat } 57d674413ff460afe1da049e54bb7a489132799749San Mehat} 58d674413ff460afe1da049e54bb7a489132799749San Mehat 593311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner/* If the string between 'str' and 'end' begins with 'prefixlen' characters 603311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner * from the 'prefix' array, then return 'str + prefixlen', otherwise return 613311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner * NULL. 623311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner */ 633311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turnerstatic const char* 643311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turnerhas_prefix(const char* str, const char* end, const char* prefix, size_t prefixlen) 653311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner{ 663311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner if ((end-str) >= (ptrdiff_t)prefixlen && !memcmp(str, prefix, prefixlen)) 673311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner return str + prefixlen; 683311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner else 693311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner return NULL; 703311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner} 713311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 723311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner/* Same as strlen(x) for constant string literals ONLY */ 733311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner#define CONST_STRLEN(x) (sizeof(x)-1) 743311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 753311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner/* Convenience macro to call has_prefix with a constant string literal */ 763311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner#define HAS_CONST_PREFIX(str,end,prefix) has_prefix((str),(end),prefix,CONST_STRLEN(prefix)) 773311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 783311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 79168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatbool NetlinkEvent::decode(char *buffer, int size) { 803311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner const char *s = buffer; 813311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner const char *end; 82168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat int param_idx = 0; 83168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat int i; 84168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat int first = 1; 85168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 863311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner if (size == 0) 873311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner return false; 883311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 893311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner /* Ensure the buffer is zero-terminated, the code below depends on this */ 903311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner buffer[size-1] = '\0'; 913311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner 92168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat end = s + size; 93168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat while (s < end) { 94168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat if (first) { 953311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner const char *p; 963311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner /* buffer is 0-terminated, no need to check p < end */ 973311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner for (p = s; *p != '@'; p++) { 983311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner if (!*p) { /* no '@', should not happen */ 993311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner return false; 1003311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } 1013311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } 1023311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner mPath = strdup(p+1); 103168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat first = 0; 104168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat } else { 1053311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner const char* a; 1063311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner if ((a = HAS_CONST_PREFIX(s, end, "ACTION=")) != NULL) { 107168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat if (!strcmp(a, "add")) 108168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat mAction = NlActionAdd; 109168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat else if (!strcmp(a, "remove")) 110168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat mAction = NlActionRemove; 111168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat else if (!strcmp(a, "change")) 112168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat mAction = NlActionChange; 1133311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } else if ((a = HAS_CONST_PREFIX(s, end, "SEQNUM=")) != NULL) { 1143311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner mSeq = atoi(a); 1153311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } else if ((a = HAS_CONST_PREFIX(s, end, "SUBSYSTEM=")) != NULL) { 1163311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner mSubsystem = strdup(a); 1173311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } else if (param_idx < NL_PARAMS_MAX) { 118168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat mParams[param_idx++] = strdup(s); 1193311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner } 120168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat } 1213311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner s += strlen(s) + 1; 122168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat } 123168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat return true; 124168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat} 125168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 126168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehatconst char *NetlinkEvent::findParam(const char *paramName) { 12780ec37aa15c138beee5889a257d1241c30a1e8d7Chih-Wei Huang size_t len = strlen(paramName); 1283311eea1d3881e6f3d6806988b7db3de0a5f68d5David 'Digit' Turner for (int i = 0; i < NL_PARAMS_MAX && mParams[i] != NULL; ++i) { 12980ec37aa15c138beee5889a257d1241c30a1e8d7Chih-Wei Huang const char *ptr = mParams[i] + len; 13080ec37aa15c138beee5889a257d1241c30a1e8d7Chih-Wei Huang if (!strncmp(mParams[i], paramName, len) && *ptr == '=') 13180ec37aa15c138beee5889a257d1241c30a1e8d7Chih-Wei Huang return ++ptr; 132168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat } 133168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat 1347e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("NetlinkEvent::FindParam(): Parameter '%s' not found", paramName); 135168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat return NULL; 136168415b822cae1f8b54ef09c41c11a9b97b87f40San Mehat} 137