A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "packeted_bio.h"
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <openssl/crypto.h>
namespace {
const uint8_t kOpcodePacket = 'P';
const uint8_t kOpcodeTimeout = 'T';
const uint8_t kOpcodeTimeoutAck = 't';
struct PacketedBio {
explicit PacketedBio(bool advance_clock_arg)
: advance_clock(advance_clock_arg) {
memset(&timeout, 0, sizeof(timeout));
memset(&clock, 0, sizeof(clock));
memset(&read_deadline, 0, sizeof(read_deadline));
}
bool HasTimeout() const {
return timeout.tv_sec != 0 || timeout.tv_usec != 0;
}
bool CanRead() const {
if (read_deadline.tv_sec == 0 && read_deadline.tv_usec == 0) {
return true;
}
if (clock.tv_sec == read_deadline.tv_sec) {
return clock.tv_usec < read_deadline.tv_usec;
}
return clock.tv_sec < read_deadline.tv_sec;
}
timeval timeout;
timeval clock;
timeval read_deadline;
bool advance_clock;
};
PacketedBio *GetData(BIO *bio) {
return (PacketedBio *)BIO_get_data(bio);
}
const PacketedBio *GetData(const BIO *bio) {
return GetData(const_cast<BIO*>(bio));
}
// ReadAll reads |len| bytes from |bio| into |out|. It returns 1 on success and
// 0 or -1 on error.
static int ReadAll(BIO *bio, uint8_t *out, size_t len) {
while (len > 0) {
int chunk_len = INT_MAX;
if (len <= INT_MAX) {
chunk_len = (int)len;
}
int ret = BIO_read(bio, out, chunk_len);
if (ret <= 0) {
return ret;
}
out += ret;
len -= ret;
}
return 1;
}
static int PacketedWrite(BIO *bio, const char *in, int inl) {
if (BIO_next(bio) == NULL) {
return 0;
}
BIO_clear_retry_flags(bio);
// Write the header.
uint8_t header[5];
header[0] = kOpcodePacket;
header[1] = (inl >> 24) & 0xff;
header[2] = (inl >> 16) & 0xff;
header[3] = (inl >> 8) & 0xff;
header[4] = inl & 0xff;
int ret = BIO_write(BIO_next(bio), header, sizeof(header));
if (ret <= 0) {
BIO_copy_next_retry(bio);
return ret;
}
// Write the buffer.
ret = BIO_write(BIO_next(bio), in, inl);
if (ret < 0 || (inl > 0 && ret == 0)) {
BIO_copy_next_retry(bio);
return ret;
}
assert(ret == inl);
return ret;
}
static int PacketedRead(BIO *bio, char *out, int outl) {
PacketedBio *data = GetData(bio);
if (BIO_next(bio) == NULL) {
return 0;
}
BIO_clear_retry_flags(bio);
for (;;) {
// Check if the read deadline has passed.
if (!data->CanRead()) {
BIO_set_retry_read(bio);
return -1;
}
// Read the opcode.
uint8_t opcode;
int ret = ReadAll(BIO_next(bio), &opcode, sizeof(opcode));
if (ret <= 0) {
BIO_copy_next_retry(bio);
return ret;
}
if (opcode == kOpcodeTimeout) {
// The caller is required to advance any pending timeouts before
// continuing.
if (data->HasTimeout()) {
fprintf(stderr, "Unprocessed timeout!\n");
return -1;
}
// Process the timeout.
uint8_t buf[8];
ret = ReadAll(BIO_next(bio), buf, sizeof(buf));
if (ret <= 0) {
BIO_copy_next_retry(bio);
return ret;
}
uint64_t timeout = (static_cast<uint64_t>(buf[0]) << 56) |
(static_cast<uint64_t>(buf[1]) << 48) |
(static_cast<uint64_t>(buf[2]) << 40) |
(static_cast<uint64_t>(buf[3]) << 32) |
(static_cast<uint64_t>(buf[4]) << 24) |
(static_cast<uint64_t>(buf[5]) << 16) |
(static_cast<uint64_t>(buf[6]) << 8) |
static_cast<uint64_t>(buf[7]);
timeout /= 1000; // Convert nanoseconds to microseconds.
data->timeout.tv_usec = timeout % 1000000;
data->timeout.tv_sec = timeout / 1000000;
// Send an ACK to the peer.
ret = BIO_write(BIO_next(bio), &kOpcodeTimeoutAck, 1);
if (ret <= 0) {
return ret;
}
assert(ret == 1);
if (!data->advance_clock) {
// Signal to the caller to retry the read, after advancing the clock.
BIO_set_retry_read(bio);
return -1;
}
PacketedBioAdvanceClock(bio);
continue;
}
if (opcode != kOpcodePacket) {
fprintf(stderr, "Unknown opcode, %u\n", opcode);
return -1;
}
// Read the length prefix.
uint8_t len_bytes[4];
ret = ReadAll(BIO_next(bio), len_bytes, sizeof(len_bytes));
if (ret <= 0) {
BIO_copy_next_retry(bio);
return ret;
}
uint32_t len = (len_bytes[0] << 24) | (len_bytes[1] << 16) |
(len_bytes[2] << 8) | len_bytes[3];
uint8_t *buf = (uint8_t *)OPENSSL_malloc(len);
if (buf == NULL) {
return -1;
}
ret = ReadAll(BIO_next(bio), buf, len);
if (ret <= 0) {
fprintf(stderr, "Packeted BIO was truncated\n");
return -1;
}
if (outl > (int)len) {
outl = len;
}
memcpy(out, buf, outl);
OPENSSL_free(buf);
return outl;
}
}
static long PacketedCtrl(BIO *bio, int cmd, long num, void *ptr) {
if (cmd == BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT) {
memcpy(&GetData(bio)->read_deadline, ptr, sizeof(timeval));
return 1;
}
if (BIO_next(bio) == NULL) {
return 0;
}
BIO_clear_retry_flags(bio);
int ret = BIO_ctrl(BIO_next(bio), cmd, num, ptr);
BIO_copy_next_retry(bio);
return ret;
}
static int PacketedNew(BIO *bio) {
BIO_set_init(bio, 1);
return 1;
}
static int PacketedFree(BIO *bio) {
if (bio == NULL) {
return 0;
}
delete GetData(bio);
BIO_set_init(bio, 0);
return 1;
}
static long PacketedCallbackCtrl(BIO *bio, int cmd, BIO_info_cb fp)
{
if (BIO_next(bio) == NULL)
return 0;
return BIO_callback_ctrl(BIO_next(bio), cmd, fp);
}
static BIO_METHOD *g_packeted_bio_method = NULL;
static const BIO_METHOD *PacketedMethod(void)
{
if (g_packeted_bio_method == NULL) {
g_packeted_bio_method = BIO_meth_new(BIO_TYPE_FILTER, "packeted bio");
if ( g_packeted_bio_method == NULL
|| !BIO_meth_set_write(g_packeted_bio_method, PacketedWrite)
|| !BIO_meth_set_read(g_packeted_bio_method, PacketedRead)
|| !BIO_meth_set_ctrl(g_packeted_bio_method, PacketedCtrl)
|| !BIO_meth_set_create(g_packeted_bio_method, PacketedNew)
|| !BIO_meth_set_destroy(g_packeted_bio_method, PacketedFree)
|| !BIO_meth_set_callback_ctrl(g_packeted_bio_method,
PacketedCallbackCtrl))
return NULL;
}
return g_packeted_bio_method;
}
} // namespace
bssl::UniquePtr<BIO> PacketedBioCreate(bool advance_clock) {
bssl::UniquePtr<BIO> bio(BIO_new(PacketedMethod()));
if (!bio) {
return nullptr;
}
BIO_set_data(bio.get(), new PacketedBio(advance_clock));
return bio;
}
timeval PacketedBioGetClock(const BIO *bio) {
return GetData(bio)->clock;
}
bool PacketedBioAdvanceClock(BIO *bio) {
PacketedBio *data = GetData(bio);
if (data == nullptr) {
return false;
}
if (!data->HasTimeout()) {
return false;
}
data->clock.tv_usec += data->timeout.tv_usec;
data->clock.tv_sec += data->clock.tv_usec / 1000000;
data->clock.tv_usec %= 1000000;
data->clock.tv_sec += data->timeout.tv_sec;
memset(&data->timeout, 0, sizeof(data->timeout));
return true;
}