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#include "node_crypto_bio.h"
#include "openssl/bio.h"
#include "util.h"
#include "util-inl.h"
#include <limits.h>
#include <string.h>
namespace node {
const BIO_METHOD NodeBIO::method = {
BIO_TYPE_MEM,
"node.js SSL buffer",
NodeBIO::Write,
NodeBIO::Read,
NodeBIO::Puts,
NodeBIO::Gets,
NodeBIO::Ctrl,
NodeBIO::New,
NodeBIO::Free,
nullptr
};
BIO* NodeBIO::New() {
// The const_cast doesn't violate const correctness. OpenSSL's usage of
// BIO_METHOD is effectively const but BIO_new() takes a non-const argument.
return BIO_new(const_cast<BIO_METHOD*>(&method));
}
BIO* NodeBIO::NewFixed(const char* data, size_t len) {
BIO* bio = New();
if (bio == nullptr ||
len > INT_MAX ||
BIO_write(bio, data, len) != static_cast<int>(len) ||
BIO_set_mem_eof_return(bio, 0) != 1) {
BIO_free(bio);
return nullptr;
}
return bio;
}
void NodeBIO::AssignEnvironment(Environment* env) {
env_ = env;
}
int NodeBIO::New(BIO* bio) {
bio->ptr = new NodeBIO();
// XXX Why am I doing it?!
bio->shutdown = 1;
bio->init = 1;
bio->num = -1;
return 1;
}
int NodeBIO::Free(BIO* bio) {
if (bio == nullptr)
return 0;
if (bio->shutdown) {
if (bio->init && bio->ptr != nullptr) {
delete FromBIO(bio);
bio->ptr = nullptr;
}
}
return 1;
}
int NodeBIO::Read(BIO* bio, char* out, int len) {
int bytes;
BIO_clear_retry_flags(bio);
bytes = FromBIO(bio)->Read(out, len);
if (bytes == 0) {
bytes = bio->num;
if (bytes != 0) {
BIO_set_retry_read(bio);
}
}
return bytes;
}
char* NodeBIO::Peek(size_t* size) {
*size = read_head_->write_pos_ - read_head_->read_pos_;
return read_head_->data_ + read_head_->read_pos_;
}
size_t NodeBIO::PeekMultiple(char** out, size_t* size, size_t* count) {
Buffer* pos = read_head_;
size_t max = *count;
size_t total = 0;
size_t i;
for (i = 0; i < max; i++) {
size[i] = pos->write_pos_ - pos->read_pos_;
total += size[i];
out[i] = pos->data_ + pos->read_pos_;
/* Don't get past write head */
if (pos == write_head_)
break;
else
pos = pos->next_;
}
if (i == max)
*count = i;
else
*count = i + 1;
return total;
}
int NodeBIO::Write(BIO* bio, const char* data, int len) {
BIO_clear_retry_flags(bio);
FromBIO(bio)->Write(data, len);
return len;
}
int NodeBIO::Puts(BIO* bio, const char* str) {
return Write(bio, str, strlen(str));
}
int NodeBIO::Gets(BIO* bio, char* out, int size) {
NodeBIO* nbio = FromBIO(bio);
if (nbio->Length() == 0)
return 0;
int i = nbio->IndexOf('\n', size);
// Include '\n', if it's there. If not, don't read off the end.
if (i < size && i >= 0 && static_cast<size_t>(i) < nbio->Length())
i++;
// Shift `i` a bit to nullptr-terminate string later
if (size == i)
i--;
// Flush read data
nbio->Read(out, i);
out[i] = 0;
return i;
}
long NodeBIO::Ctrl(BIO* bio, int cmd, long num, // NOLINT(runtime/int)
void* ptr) {
NodeBIO* nbio;
long ret; // NOLINT(runtime/int)
nbio = FromBIO(bio);
ret = 1;
switch (cmd) {
case BIO_CTRL_RESET:
nbio->Reset();
break;
case BIO_CTRL_EOF:
ret = nbio->Length() == 0;
break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
bio->num = num;
break;
case BIO_CTRL_INFO:
ret = nbio->Length();
if (ptr != nullptr)
*reinterpret_cast<void**>(ptr) = nullptr;
break;
case BIO_C_SET_BUF_MEM:
CHECK(0 && "Can't use SET_BUF_MEM_PTR with NodeBIO");
break;
case BIO_C_GET_BUF_MEM_PTR:
CHECK(0 && "Can't use GET_BUF_MEM_PTR with NodeBIO");
ret = 0;
break;
case BIO_CTRL_GET_CLOSE:
ret = bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = num;
break;
case BIO_CTRL_WPENDING:
ret = 0;
break;
case BIO_CTRL_PENDING:
ret = nbio->Length();
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_PUSH:
case BIO_CTRL_POP:
default:
ret = 0;
break;
}
return ret;
}
void NodeBIO::TryMoveReadHead() {
// `read_pos_` and `write_pos_` means the position of the reader and writer
// inside the buffer, respectively. When they're equal - its safe to reset
// them, because both reader and writer will continue doing their stuff
// from new (zero) positions.
while (read_head_->read_pos_ != 0 &&
read_head_->read_pos_ == read_head_->write_pos_) {
// Reset positions
read_head_->read_pos_ = 0;
read_head_->write_pos_ = 0;
// Move read_head_ forward, just in case if there're still some data to
// read in the next buffer.
if (read_head_ != write_head_)
read_head_ = read_head_->next_;
}
}
size_t NodeBIO::Read(char* out, size_t size) {
size_t bytes_read = 0;
size_t expected = Length() > size ? size : Length();
size_t offset = 0;
size_t left = size;
while (bytes_read < expected) {
CHECK_LE(read_head_->read_pos_, read_head_->write_pos_);
size_t avail = read_head_->write_pos_ - read_head_->read_pos_;
if (avail > left)
avail = left;
// Copy data
if (out != nullptr)
memcpy(out + offset, read_head_->data_ + read_head_->read_pos_, avail);
read_head_->read_pos_ += avail;
// Move pointers
bytes_read += avail;
offset += avail;
left -= avail;
TryMoveReadHead();
}
CHECK_EQ(expected, bytes_read);
length_ -= bytes_read;
// Free all empty buffers, but write_head's child
FreeEmpty();
return bytes_read;
}
void NodeBIO::FreeEmpty() {
if (write_head_ == nullptr)
return;
Buffer* child = write_head_->next_;
if (child == write_head_ || child == read_head_)
return;
Buffer* cur = child->next_;
if (cur == write_head_ || cur == read_head_)
return;
Buffer* prev = child;
while (cur != read_head_) {
CHECK_NE(cur, write_head_);
CHECK_EQ(cur->write_pos_, cur->read_pos_);
Buffer* next = cur->next_;
delete cur;
cur = next;
}
prev->next_ = cur;
}
size_t NodeBIO::IndexOf(char delim, size_t limit) {
size_t bytes_read = 0;
size_t max = Length() > limit ? limit : Length();
size_t left = limit;
Buffer* current = read_head_;
while (bytes_read < max) {
CHECK_LE(current->read_pos_, current->write_pos_);
size_t avail = current->write_pos_ - current->read_pos_;
if (avail > left)
avail = left;
// Walk through data
char* tmp = current->data_ + current->read_pos_;
size_t off = 0;
while (off < avail && *tmp != delim) {
off++;
tmp++;
}
// Move pointers
bytes_read += off;
left -= off;
// Found `delim`
if (off != avail) {
return bytes_read;
}
// Move to next buffer
if (current->read_pos_ + avail == current->len_) {
current = current->next_;
}
}
CHECK_EQ(max, bytes_read);
return max;
}
void NodeBIO::Write(const char* data, size_t size) {
size_t offset = 0;
size_t left = size;
// Allocate initial buffer if the ring is empty
TryAllocateForWrite(left);
while (left > 0) {
size_t to_write = left;
CHECK_LE(write_head_->write_pos_, write_head_->len_);
size_t avail = write_head_->len_ - write_head_->write_pos_;
if (to_write > avail)
to_write = avail;
// Copy data
memcpy(write_head_->data_ + write_head_->write_pos_,
data + offset,
to_write);
// Move pointers
left -= to_write;
offset += to_write;
length_ += to_write;
write_head_->write_pos_ += to_write;
CHECK_LE(write_head_->write_pos_, write_head_->len_);
// Go to next buffer if there still are some bytes to write
if (left != 0) {
CHECK_EQ(write_head_->write_pos_, write_head_->len_);
TryAllocateForWrite(left);
write_head_ = write_head_->next_;
// Additionally, since we're moved to the next buffer, read head
// may be moved as well.
TryMoveReadHead();
}
}
CHECK_EQ(left, 0);
}
char* NodeBIO::PeekWritable(size_t* size) {
TryAllocateForWrite(*size);
size_t available = write_head_->len_ - write_head_->write_pos_;
if (*size != 0 && available > *size)
available = *size;
else
*size = available;
return write_head_->data_ + write_head_->write_pos_;
}
void NodeBIO::Commit(size_t size) {
write_head_->write_pos_ += size;
length_ += size;
CHECK_LE(write_head_->write_pos_, write_head_->len_);
// Allocate new buffer if write head is full,
// and there're no other place to go
TryAllocateForWrite(0);
if (write_head_->write_pos_ == write_head_->len_) {
write_head_ = write_head_->next_;
// Additionally, since we're moved to the next buffer, read head
// may be moved as well.
TryMoveReadHead();
}
}
void NodeBIO::TryAllocateForWrite(size_t hint) {
Buffer* w = write_head_;
Buffer* r = read_head_;
// If write head is full, next buffer is either read head or not empty.
if (w == nullptr ||
(w->write_pos_ == w->len_ &&
(w->next_ == r || w->next_->write_pos_ != 0))) {
size_t len = w == nullptr ? initial_ :
kThroughputBufferLength;
if (len < hint)
len = hint;
Buffer* next = new Buffer(env_, len);
if (w == nullptr) {
next->next_ = next;
write_head_ = next;
read_head_ = next;
} else {
next->next_ = w->next_;
w->next_ = next;
}
}
}
void NodeBIO::Reset() {
if (read_head_ == nullptr)
return;
while (read_head_->read_pos_ != read_head_->write_pos_) {
CHECK(read_head_->write_pos_ > read_head_->read_pos_);
length_ -= read_head_->write_pos_ - read_head_->read_pos_;
read_head_->write_pos_ = 0;
read_head_->read_pos_ = 0;
read_head_ = read_head_->next_;
}
write_head_ = read_head_;
CHECK_EQ(length_, 0);
}
NodeBIO::~NodeBIO() {
if (read_head_ == nullptr)
return;
Buffer* current = read_head_;
do {
Buffer* next = current->next_;
delete current;
current = next;
} while (current != read_head_);
read_head_ = nullptr;
write_head_ = nullptr;
}
} // namespace node
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