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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <string.h>
#define LOG_TAG "NetlinkEvent"
#include <cutils/log.h>
#include <sysutils/NetlinkEvent.h>
const int NetlinkEvent::NlActionUnknown = 0;
const int NetlinkEvent::NlActionAdd = 1;
const int NetlinkEvent::NlActionRemove = 2;
const int NetlinkEvent::NlActionChange = 3;
NetlinkEvent::NetlinkEvent() {
mAction = NlActionUnknown;
memset(mParams, 0, sizeof(mParams));
mPath = NULL;
mSubsystem = NULL;
}
NetlinkEvent::~NetlinkEvent() {
int i;
if (mPath)
free(mPath);
if (mSubsystem)
free(mSubsystem);
for (i = 0; i < NL_PARAMS_MAX; i++) {
if (!mParams[i])
break;
free(mParams[i]);
}
}
void NetlinkEvent::dump() {
int i;
for (i = 0; i < NL_PARAMS_MAX; i++) {
if (!mParams[i])
break;
SLOGD("NL param '%s'\n", mParams[i]);
}
}
/* If the string between 'str' and 'end' begins with 'prefixlen' characters
* from the 'prefix' array, then return 'str + prefixlen', otherwise return
* NULL.
*/
static const char*
has_prefix(const char* str, const char* end, const char* prefix, size_t prefixlen)
{
if ((end-str) >= (ptrdiff_t)prefixlen && !memcmp(str, prefix, prefixlen))
return str + prefixlen;
else
return NULL;
}
/* Same as strlen(x) for constant string literals ONLY */
#define CONST_STRLEN(x) (sizeof(x)-1)
/* Convenience macro to call has_prefix with a constant string literal */
#define HAS_CONST_PREFIX(str,end,prefix) has_prefix((str),(end),prefix,CONST_STRLEN(prefix))
bool NetlinkEvent::decode(char *buffer, int size) {
const char *s = buffer;
const char *end;
int param_idx = 0;
int i;
int first = 1;
if (size == 0)
return false;
/* Ensure the buffer is zero-terminated, the code below depends on this */
buffer[size-1] = '\0';
end = s + size;
while (s < end) {
if (first) {
const char *p;
/* buffer is 0-terminated, no need to check p < end */
for (p = s; *p != '@'; p++) {
if (!*p) { /* no '@', should not happen */
return false;
}
}
mPath = strdup(p+1);
first = 0;
} else {
const char* a;
if ((a = HAS_CONST_PREFIX(s, end, "ACTION=")) != NULL) {
if (!strcmp(a, "add"))
mAction = NlActionAdd;
else if (!strcmp(a, "remove"))
mAction = NlActionRemove;
else if (!strcmp(a, "change"))
mAction = NlActionChange;
} else if ((a = HAS_CONST_PREFIX(s, end, "SEQNUM=")) != NULL) {
mSeq = atoi(a);
} else if ((a = HAS_CONST_PREFIX(s, end, "SUBSYSTEM=")) != NULL) {
mSubsystem = strdup(a);
} else if (param_idx < NL_PARAMS_MAX) {
mParams[param_idx++] = strdup(s);
}
}
s += strlen(s) + 1;
}
return true;
}
const char *NetlinkEvent::findParam(const char *paramName) {
size_t len = strlen(paramName);
for (int i = 0; i < NL_PARAMS_MAX && mParams[i] != NULL; ++i) {
const char *ptr = mParams[i] + len;
if (!strncmp(mParams[i], paramName, len) && *ptr == '=')
return ++ptr;
}
SLOGE("NetlinkEvent::FindParam(): Parameter '%s' not found", paramName);
return NULL;
}
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