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/*
* Copyright (C) 2016 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <string.h>
#include <sys/prctl.h>
#include <sys/system_properties.h>
#include <unistd.h>
#include <string>
#include <vector>
#include "android-base/strings.h"
#include "linker_logger.h"
#include "private/libc_logging.h"
LinkerLogger g_linker_logger;
static const char* kSystemLdDebugProperty = "debug.ld.all";
static const char* kLdDebugPropertyPrefix = "debug.ld.app.";
static const char* kOptionErrors = "dlerror";
static const char* kOptionDlopen = "dlopen";
static std::string property_get(const char* name) {
char value[PROP_VALUE_MAX] = {};
__system_property_get(name, value);
return value;
}
static uint32_t ParseProperty(const std::string& value) {
if (value.empty()) {
return 0;
}
std::vector<std::string> options = android::base::Split(value, ",");
uint32_t flags = 0;
for (const auto& o : options) {
if (o == kOptionErrors) {
flags |= kLogErrors;
} else if (o == kOptionDlopen){
flags |= kLogDlopen;
} else {
__libc_format_log(ANDROID_LOG_WARN, "linker", "Unknown debug.ld option \"%s\", will ignore.", o.c_str());
}
}
return flags;
}
void LinkerLogger::ResetState() {
// the most likely scenario app is not debuggable and
// is running on user build - the logging is disabled.
if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) {
return;
}
flags_ = 0;
// check flag applied to all processes first
std::string value = property_get(kSystemLdDebugProperty);
flags_ |= ParseProperty(value);
// get process basename
std::string process_name = basename(g_argv[0]);
std::string property_name = std::string(kLdDebugPropertyPrefix) + process_name;
// Property names are limited to PROP_NAME_MAX.
if (property_name.size() >= PROP_NAME_MAX) {
size_t count = PROP_NAME_MAX - 1;
// remove trailing dots...
while (property_name[count-1] == '.') {
--count;
}
property_name = property_name.substr(0, count);
}
value = property_get(property_name.c_str());
flags_ |= ParseProperty(value);
}
void LinkerLogger::Log(uint32_t type, const char* format, ...) {
if ((flags_ & type) == 0) {
return;
}
va_list ap;
va_start(ap, format);
__libc_format_log_va_list(ANDROID_LOG_DEBUG, "linker", format, ap);
va_end(ap);
}
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