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ircd::server: Fix dynamic chunk head buffer calculation.

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This commit is contained in:
Jason Volk 2020-01-24 12:01:48 -08:00
parent 2e9337d198
commit b7855f15bb
1 changed files with 31 additions and 14 deletions
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45
ircd/server.cc
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@ -3436,6 +3436,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
};
// The received buffer may go past the end of the head.
assert(addl_head_bytes >= size(http::line::terminator));
assert(addl_head_bytes <= size(buffer));
const size_t beyond_head_length
{
@ -3444,21 +3445,36 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
state.chunk_read += addl_head_bytes;
state.content_read += addl_head_bytes;
// The primary HTTP head was placed in req.in.head. Before this function
// was reached req.in.head was resized tight to that head. There is still
// buffer remaining after that which we now use for chunk heads. We offset
// to state.head_read and cannot use more than state.head_rem for chunk
// head scratch. Chunk heads may overwrite each other to not run out of
// head buffer while keeping the data buffers pure with chunk content.
assert(size(req.in.head) >= state.head_read);
const const_buffer chunk_head_buffer
{
data(req.in.head) + state.head_read, state.head_rem
};
// Focus specifically on this chunk head and nothing after.
assert(data(chunk_head_buffer) <= data(buffer));
const const_buffer chunk_head
{
req.in.head + state.head_read, state.chunk_read
chunk_head_buffer, state.chunk_read
};
// Window on any data in the buffer after the head.
const const_buffer beyond_head
{
chunk_head_buffer + size(chunk_head), beyond_head_length
};
state.chunk_read = 0;
assert(state.content_read >= size(chunk_head));
state.content_read -= size(chunk_head);
// Window on any data in the buffer after the head.
const const_buffer beyond_head
{
req.in.head + size(chunk_head), beyond_head_length
};
// Setup the capstan and mark the end of the tape
parse::buffer pb
{
@ -3474,6 +3490,7 @@ ircd::server::tag::read_chunk_dynamic_head(const const_buffer &buffer,
// Increment the content_length to now include this chunk
state.content_length += state.chunk_length;
assert(state.content_read <= state.content_length);
// Allocate the chunk content on the vector.
//TODO: maxalloc
@ -3846,26 +3863,26 @@ const
assert(null(req.in.content));
assert(size(req.in.head) >= state.head_read);
// The total offset in the head buffer is the message head plus the
// amount of chunk head received so far, which is kept in chunk_read.
const size_t head_offset
const mutable_buffer head_buffer
{
state.head_read + state.chunk_read
data(req.in.head) + state.head_read, state.head_rem
};
// The total offset in the head buffer is the message head plus the
// amount of chunk head received so far, which is kept in chunk_read.
const mutable_buffer buffer
{
req.in.head + head_offset
head_buffer + state.chunk_read
};
if(unlikely(size(buffer) < 16))
throw buffer_overrun
{
"Chunk dynamic head buffer too small size:%zu chunk_read:%zu head_read:%zu head_offset:%zu",
"Chunk dynamic head buffer too small size:%zu chunk_read:%zu head_read:%zu head_rem:%zu",
size(buffer),
state.chunk_read,
state.head_read,
head_offset,
state.head_rem,
};
assert(!empty(buffer));