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MINOR: proto_htx: Use full HTX messages to send 103-Early-Hints responses

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Instead of replying by adding an OOB block in the HTX structure, we now add a
valid HTX message. A header block is added to each early-hint rule, prefixed by
the start line if it is the first one. The response is terminated and forwarded
when the rules execution is stopped or when a rule of another type is applied.
This commit is contained in:
Christopher Faulet 2018-11-28 13:55:14 +01:00 committed by Willy Tarreau
parent 23a3c790e6
commit ee9b5bfe89
1 changed files with 67 additions and 62 deletions
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129
src/proto_htx.c
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@ -2469,6 +2469,7 @@ int htx_apply_redirect_rule(struct redirect_rule *rule, struct stream *s, struct
s->logs.tv_request = now;
/* FIXME: close for now, but it could be cool to handle the keep-alive here */
/* FIXME: check if EOM is here to do keep-alive or not */
if (unlikely(txn->flags & TX_USE_PX_CONN)) {
if (!chunk_memcat(chunk, "\r\nProxy-Connection: close\r\n\r\n", 29))
goto leave;
@ -2532,61 +2533,70 @@ static int htx_transform_header(struct stream* s, struct channel *chn, struct ht
return ret;
}
/* Terminate a 103-Erly-hints response and send it to the client. It returns 0
* on success and -1 on error. The response channel is updated accordingly.
*/
static int htx_reply_103_early_hints(struct channel *res)
{
struct htx *htx = htx_from_buf(&res->buf);
size_t data;
if (!htx_add_endof(htx, HTX_BLK_EOH) || !htx_add_endof(htx, HTX_BLK_EOM)) {
/* If an error occurred during an Early-hint rule,
* remove the incomplete HTTP 103 response from the
* buffer */
channel_truncate(res);
return -1;
}
data = htx->data - co_data(res);
b_set_data(&res->buf, b_size(&res->buf));
c_adv(res, data);
res->total += data;
return 0;
}
/*
* Build an HTTP Early Hint HTTP 103 response header with <name> as name and with a value
* built according to <fmt> log line format.
* If <early_hints> is NULL, it is allocated and the HTTP 103 response first
* line is inserted before the header. If an error occurred <early_hints> is
* released and NULL is returned. On success the updated buffer is returned.
* If <early_hints> is 0, it is starts a new response by adding the start
* line. If an error occurred -1 is returned. On success 0 is returned. The
* channel is not updated here. It must be done calling the function
* htx_reply_103_early_hints().
*/
static struct buffer *htx_apply_early_hint_rule(struct stream* s, struct buffer *early_hints,
const char* name, unsigned int name_len,
struct list *fmt)
static int htx_add_early_hint_header(struct stream *s, int early_hints, const struct ist name, struct list *fmt)
{
struct channel *res = &s->res;
struct htx *htx = htx_from_buf(&res->buf);
struct buffer *value = alloc_trash_chunk();
if (!early_hints) {
early_hints = alloc_trash_chunk();
if (!early_hints)
goto fail;
if (!chunk_memcat(early_hints, HTTP_103.ptr, HTTP_103.len))
struct htx_sl *sl;
unsigned int flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|
HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
ist("HTTP/1.1"), ist("103"), ist("Early Hints"));
if (!sl)
goto fail;
sl->info.res.status = 103;
}
if (!chunk_memcat(early_hints, name, name_len) || !chunk_memcat(early_hints, ": ", 2))
value->data = build_logline(s, b_tail(value), b_room(value), fmt);
if (!htx_add_header(htx, name, ist2(b_head(value), b_data(value))))
goto fail;
early_hints->data += build_logline(s, b_tail(early_hints), b_room(early_hints), fmt);
if (!chunk_memcat(early_hints, "\r\n", 2))
goto fail;
return early_hints;
free_trash_chunk(value);
b_set_data(&res->buf, b_size(&res->buf));
return 1;
fail:
free_trash_chunk(early_hints);
return NULL;
}
/* Sends an HTTP 103 response. Before sending it, the last CRLF finishing the
* response is added. If an error occurred or if another response was already
* sent, this function does nothing.
*/
static void htx_send_early_hints(struct stream *s, struct buffer *early_hints)
{
struct channel *chn = s->txn->rsp.chn;
struct htx *htx;
/* If a response was already sent, skip early hints */
if (s->txn->status > 0)
return;
if (!chunk_memcat(early_hints, "\r\n", 2))
return;
htx = htx_from_buf(&chn->buf);
if (!htx_add_oob(htx, ist2(early_hints->area, early_hints->data)))
return;
c_adv(chn, early_hints->data);
chn->total += early_hints->data;
/* If an error occurred during an Early-hint rule, remove the incomplete
* HTTP 103 response from the buffer */
channel_truncate(res);
free_trash_chunk(value);
return -1;
}
/* This function executes one of the set-{method,path,query,uri} actions. It
@ -2674,9 +2684,9 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
struct act_rule *rule;
struct http_hdr_ctx ctx;
const char *auth_realm;
struct buffer *early_hints = NULL;
enum rule_result rule_ret = HTTP_RULE_RES_CONT;
int act_flags = 0;
int early_hints = 0;
htx = htx_from_buf(&s->req.buf);
@ -2710,6 +2720,14 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
act_flags |= ACT_FLAG_FIRST;
resume_execution:
if (early_hints && rule->action != ACT_HTTP_EARLY_HINT) {
early_hints = 0;
if (htx_reply_103_early_hints(&s->res) == -1) {
rule_ret = HTTP_RULE_RES_BADREQ;
goto end;
}
}
switch (rule->action) {
case ACT_ACTION_ALLOW:
rule_ret = HTTP_RULE_RES_STOP;
@ -2729,12 +2747,6 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
goto end;
case ACT_HTTP_REQ_AUTH:
/* Be sure to sned any pending HTTP 103 response first */
if (early_hints) {
htx_send_early_hints(s, early_hints);
free_trash_chunk(early_hints);
early_hints = NULL;
}
/* Auth might be performed on regular http-req rules as well as on stats */
auth_realm = rule->arg.auth.realm;
if (!auth_realm) {
@ -2755,12 +2767,6 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
goto end;
case ACT_HTTP_REDIR:
/* Be sure to sned any pending HTTP 103 response first */
if (early_hints) {
htx_send_early_hints(s, early_hints);
free_trash_chunk(early_hints);
early_hints = NULL;
}
rule_ret = HTTP_RULE_RES_DONE;
if (!htx_apply_redirect_rule(rule->arg.redir, s, txn))
rule_ret = HTTP_RULE_RES_BADREQ;
@ -2959,12 +2965,11 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
case ACT_HTTP_EARLY_HINT:
if (!(txn->req.flags & HTTP_MSGF_VER_11))
break;
early_hints = htx_apply_early_hint_rule(s, early_hints,
rule->arg.early_hint.name,
rule->arg.early_hint.name_len,
early_hints = htx_add_early_hint_header(s, early_hints,
ist2(rule->arg.early_hint.name, rule->arg.early_hint.name_len),
&rule->arg.early_hint.fmt);
if (!early_hints) {
rule_ret = HTTP_RULE_RES_DONE;
if (early_hints == -1) {
rule_ret = HTTP_RULE_RES_BADREQ;
goto end;
}
break;
@ -3042,8 +3047,8 @@ static enum rule_result htx_req_get_intercept_rule(struct proxy *px, struct list
end:
if (early_hints) {
htx_send_early_hints(s, early_hints);
free_trash_chunk(early_hints);
if (htx_reply_103_early_hints(&s->res) == -1)
rule_ret = HTTP_RULE_RES_BADREQ;
}
/* we reached the end of the rules, nothing to report */