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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.
#ifndef EXPERIMENTAL_USERS_GCONNELL_AFPACKET_INDEX_H_
#define EXPERIMENTAL_USERS_GCONNELL_AFPACKET_INDEX_H_
#include <string.h> // memcpy()
#include <map>
#include <vector>
#include <leveldb/slice.h>
#include "util.h"
#include "packets.h"
namespace leveldb {
class WritableFile;
} // namespace leveldb
namespace st {
// SliceSet is a utility function for storing unique Slices in a
// location whose persistence we can control. We use it to store the bytes
// backing an IP address without having to create new strings in memory to store
// those IPs.
class SliceSet {
private:
struct Buffer {
Buffer(Buffer* l, size_t size) : last(l), total(size), remaining(size) {
buffer = new char[size];
current = buffer;
VLOG(1) << "New stringslice is " << (total >> 20) << "MB";
}
void Reset() {
if (last) {
delete last;
}
last = NULL;
remaining = total;
current = buffer;
VLOG(1) << "Reset stringslice to " << (total >> 20) << "MB";
}
~Buffer() {
Reset();
delete[] buffer;
}
void Add(leveldb::Slice* s) {
CHECK(remaining >= s->size());
remaining -= s->size();
memcpy(current, s->data(), s->size());
*s = leveldb::Slice(current, s->size());
current += s->size();
}
Buffer* last;
char* buffer;
char* current;
size_t total;
size_t remaining;
};
public:
SliceSet(size_t initial) : last_size_(initial) {
current_ = new Buffer(NULL, initial);
}
virtual ~SliceSet() { delete current_; }
leveldb::Slice Store(leveldb::Slice s) {
if (current_->remaining < s.size()) {
last_size_ *= 2;
if (last_size_ < s.size()) {
last_size_ = s.size();
}
current_ = new Buffer(current_, last_size_);
}
current_->Add(&s);
return s;
}
virtual void Reset() { current_->Reset(); }
private:
Buffer* current_;
size_t last_size_;
};
// Index is a simple proof-of-concept for indexing packets seen by stenotype.
// Its main purpose currently is to determine which indexes we want to use and
// provide a proving ground for things like "how many IPs that we see are
// unique", etc, to give us an idea about how much data we'll actually need to
// write to disk.
class Index {
public:
explicit Index(const std::string& dirname, int64_t micros)
: dirname_(dirname),
micros_(micros),
packets_(0),
ip_pieces_(1 << 20) {} // Start slice set off at 1MB.
virtual ~Index() {}
void Process(const Packet& p, int64_t block_offset);
Error Flush();
Error WriteTo(leveldb::WritableFile* file);
private:
void AddIPv4(uint32_t ip, uint32_t pos);
void AddIPv6(leveldb::Slice ip, uint32_t pos);
void AddProtocol(uint8_t proto, uint32_t pos);
void AddPort(uint16_t port, uint32_t pos);
void AddVLAN(uint16_t port, uint32_t pos);
void AddMPLS(uint32_t mpls, uint32_t pos);
std::string dirname_;
int64_t micros_;
int64_t packets_;
SliceSet ip_pieces_;
std::map<uint32_t, std::vector<uint32_t>> ip4_;
std::map<leveldb::Slice, std::vector<uint32_t>> ip6_;
std::map<uint8_t, std::vector<uint32_t>> proto_;
std::map<uint16_t, std::vector<uint32_t>> port_;
std::map<uint16_t, std::vector<uint32_t>> vlan_;
std::map<uint32_t, std::vector<uint32_t>> mpls_;
DISALLOW_COPY_AND_ASSIGN(Index);
};
} // namespace st
#endif // EXPERIMENTAL_USERS_GCONNELL_AFPACKET_INDEX_H_
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