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BUG/MAJOR: http/sample: use a static buffer for raw -> htx conversion

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Multiple calls to smp_fetch_fhdr use the header context to keep track of
header parsing position; however, when using header sampling on a raw
connection, the raw buffer is converted into an HTX structure each time, and
this was done in the trash areas; so the block reference would be invalid on
subsequent calls.

This patch must be backported to 2.0 and 1.9.
This commit is contained in:
Richard Russo 2019-07-31 11:45:56 -07:00 committed by Christopher Faulet
parent 0a52c17f81
commit 458eafb36d
1 changed files with 31 additions and 1 deletions
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32
src/http_fetch.c
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@ -46,10 +46,40 @@
/* this struct is used between calls to smp_fetch_hdr() or smp_fetch_cookie() */
static THREAD_LOCAL struct http_hdr_ctx static_http_hdr_ctx;
/* this is used to convert raw connection buffers to htx */
static THREAD_LOCAL struct buffer static_raw_htx_chunk;
static THREAD_LOCAL char *static_raw_htx_buf;
#define SMP_REQ_CHN(smp) (smp->strm ? &smp->strm->req : NULL)
#define SMP_RES_CHN(smp) (smp->strm ? &smp->strm->res : NULL)
/* This function returns the static htx chunk, where raw connections get
* converted to HTX as needed for samplxsing.
*/
struct buffer *get_raw_htx_chunk(void)
{
chunk_reset(&static_raw_htx_chunk);
return &static_raw_htx_chunk;
}
static int alloc_raw_htx_chunk_per_thread()
{
static_raw_htx_buf = malloc(global.tune.bufsize);
if (!static_raw_htx_buf)
return 0;
chunk_init(&static_raw_htx_chunk, static_raw_htx_buf, global.tune.bufsize);
return 1;
}
static void free_raw_htx_chunk_per_thread()
{
free(static_raw_htx_buf);
static_raw_htx_buf = NULL;
}
REGISTER_PER_THREAD_ALLOC(alloc_raw_htx_chunk_per_thread);
REGISTER_PER_THREAD_FREE(free_raw_htx_chunk_per_thread);
/*
* Returns the data from Authorization header. Function may be called more
* than once so data is stored in txn->auth_data. When no header is found
@ -234,7 +264,7 @@ struct htx *smp_prefetch_htx(struct sample *smp, struct channel *chn, int vol)
else if (h1m.flags & H1_MF_CLEN)
flags |= HTX_SL_F_CLEN;
htx = htx_from_buf(get_trash_chunk());
htx = htx_from_buf(get_raw_htx_chunk());
sl = htx_add_stline(htx, HTX_BLK_REQ_SL, flags, h1sl.rq.m, h1sl.rq.u, h1sl.rq.v);
if (!sl || !htx_add_all_headers(htx, hdrs))
return NULL;