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[MINOR] http: keep pointer to beginning of data

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We now set msg->col and msg->sov to the first byte of non-header.
They will be used later when parsing chunks. A new macro was added
to perform size additions on an http_msg in order to limit the risks
of copy-paste in the long term.

During this operation, it appeared that the http_msg struct was not
optimal on 64-bit, so it was re-ordered to fill the holes.
This commit is contained in:
Willy Tarreau 2009-11-29 18:12:29 +01:00
parent 53319c91ef
commit fa355d4a51
3 changed files with 44 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/proto/proto_http.h
View File

@ -91,6 +91,14 @@ void http_capture_bad_message(struct error_snapshot *es, struct session *s,
struct buffer *buf, struct http_msg *msg,
struct proxy *other_end);
/* to be used when contents change in an HTTP message */
#define http_msg_move_end(msg, bytes) do { \
unsigned int _bytes = (bytes); \
(msg)->col += (_bytes); \
(msg)->sov += (_bytes); \
(msg)->eoh += (_bytes); \
} while (0)
#endif /* _PROTO_PROTO_HTTP_H */
/*

14
include/types/proto_http.h
View File

@ -230,18 +230,22 @@ typedef enum {
* - eoh (End of Headers) : relative offset in the buffer of first byte that
* is not part of a completely processed header.
* During parsing, it points to last header seen
* for states after START.
* for states after START. When in HTTP_MSG_BODY,
* eoh points to the first byte of the last CRLF
* preceeding data.
* - col and sov : When in HTTP_MSG_BODY, will point to the first
* byte of data.
* - eol (End of Line) : relative offset in the buffer of the first byte
* which marks the end of the line (LF or CRLF).
*/
struct http_msg {
unsigned int msg_state; /* where we are in the current message parsing */
unsigned int col, sov; /* current header: colon, start of value */
unsigned int eoh; /* End Of Headers, relative to buffer */
char *sol; /* start of line, also start of message when fully parsed */
char *eol; /* end of line */
unsigned int som; /* Start Of Message, relative to buffer */
unsigned int col, sov; /* current header: colon, start of value */
unsigned int eoh; /* End Of Headers, relative to buffer */
char **cap; /* array of captured headers (may be NULL) */
int err_pos; /* err handling: -2=block, -1=pass, 0+=detected */
union { /* useful start line pointers, relative to buffer */
struct {
int l; /* request line length (not including CR) */
@ -257,7 +261,7 @@ struct http_msg {
} st; /* status line : field, length */
} sl; /* start line */
unsigned long long hdr_content_len; /* cache for parsed header value or for chunk-size if present */
int err_pos; /* err handling: -2=block, -1=pass, 0+=detected */
char **cap; /* array of captured headers (may be NULL) */
};
/* This is an HTTP transaction. It contains both a request message and a

50
src/proto_http.c
View File

@ -366,7 +366,7 @@ int http_header_add_tail(struct buffer *b, struct http_msg *msg,
bytes = buffer_insert_line2(b, b->data + msg->eoh, text, len);
if (!bytes)
return -1;
msg->eoh += bytes;
http_msg_move_end(msg, bytes);
return hdr_idx_add(len, 1, hdr_idx, hdr_idx->tail);
}
@ -386,7 +386,7 @@ int http_header_add_tail2(struct buffer *b, struct http_msg *msg,
bytes = buffer_insert_line2(b, b->data + msg->eoh, text, len);
if (!bytes)
return -1;
msg->eoh += bytes;
http_msg_move_end(msg, bytes);
return hdr_idx_add(len, 1, hdr_idx, hdr_idx->tail);
}
@ -1675,6 +1675,7 @@ void http_msg_analyzer(struct buffer *buf, struct http_msg *msg, struct hdr_idx
EXPECT_LF_HERE(ptr, http_msg_invalid);
ptr++;
buf->lr = ptr;
msg->col = msg->sov = buf->lr - buf->data;
msg->eoh = msg->sol - buf->data;
msg->msg_state = HTTP_MSG_BODY;
return;
@ -1717,11 +1718,11 @@ static int http_upgrade_v09_to_v10(struct buffer *req, struct http_msg *msg, str
/* if no URI was set, add "/" */
delta = buffer_replace2(req, cur_end, cur_end, " /", 2);
cur_end += delta;
msg->eoh += delta;
http_msg_move_end(msg, delta);
}
/* add HTTP version */
delta = buffer_replace2(req, cur_end, cur_end, " HTTP/1.0\r\n", 11);
msg->eoh += delta;
http_msg_move_end(msg, delta);
cur_end += delta;
cur_end = (char *)http_parse_reqline(msg, req->data,
HTTP_MSG_RQMETH,
@ -1911,7 +1912,12 @@ int http_wait_for_request(struct session *s, struct buffer *req, int an_bit)
/* OK now we have a complete HTTP request with indexed headers. Let's
* complete the request parsing by setting a few fields we will need
* later.
* later. At this point, we have the last CRLF at req->data + msg->eoh.
* If the request is in HTTP/0.9 form, the rule is still true, and eoh
* points to the CRLF of the request line. req->lr points to the first
* byte after the last LF. msg->col and msg->sov point to the first
* byte of data. msg->eol cannot be trusted because it may have been
* left uninitialized (for instance in the absence of headers).
*/
/* Maybe we found in invalid header name while we were configured not
@ -2240,7 +2246,7 @@ int http_process_req_common(struct session *s, struct buffer *req, int an_bit, s
*/
if (s->flags & SN_CONN_CLOSED) {
delta = buffer_replace2(req, cur_ptr, cur_next, NULL, 0);
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
cur_next += delta;
txn->hdr_idx.v[old_idx].next = cur_hdr->next;
txn->hdr_idx.used--;
@ -2251,7 +2257,7 @@ int http_process_req_common(struct session *s, struct buffer *req, int an_bit, s
"close", 5);
cur_next += delta;
cur_hdr->len += delta;
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
}
s->flags |= SN_CONN_CLOSED;
txn->flags &= ~TX_SRV_CONN_KA; /* keep-alive closed on server side */
@ -3300,7 +3306,7 @@ int http_process_res_common(struct session *t, struct buffer *rep, int an_bit, s
*/
if (t->flags & SN_CONN_CLOSED) {
delta = buffer_replace2(rep, cur_ptr, cur_next, NULL, 0);
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
cur_next += delta;
txn->hdr_idx.v[old_idx].next = cur_hdr->next;
txn->hdr_idx.used--;
@ -3311,7 +3317,7 @@ int http_process_res_common(struct session *t, struct buffer *rep, int an_bit, s
"close", 5);
cur_next += delta;
cur_hdr->len += delta;
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
}
t->flags |= SN_CONN_CLOSED;
}
@ -3586,15 +3592,14 @@ int apply_filter_to_req_headers(struct session *t, struct buffer *req, struct hd
cur_end += delta;
cur_next += delta;
cur_hdr->len += delta;
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
break;
case ACT_REMOVE:
delta = buffer_replace2(req, cur_ptr, cur_next, NULL, 0);
cur_next += delta;
/* FIXME: this should be a separate function */
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
txn->hdr_idx.v[old_idx].next = cur_hdr->next;
txn->hdr_idx.used--;
cur_hdr->len = 0;
@ -3704,7 +3709,7 @@ int apply_filter_to_req_line(struct session *t, struct buffer *req, struct hdr_e
* will not be counted as a new header.
*/
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
cur_end += delta;
txn->req.sol = req->data + txn->req.som; /* should be equal to txn->sol */
@ -4044,7 +4049,7 @@ void manage_client_side_cookies(struct session *t, struct buffer *req)
cur_end += delta;
cur_next += delta;
cur_hdr->len += delta;
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
del_cookie = del_colon = NULL;
app_cookies++; /* protect the header from deletion */
@ -4070,7 +4075,7 @@ void manage_client_side_cookies(struct session *t, struct buffer *req)
cur_end += delta;
cur_next += delta;
cur_hdr->len += delta;
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
del_cookie = del_colon = NULL;
}
}
@ -4115,7 +4120,7 @@ void manage_client_side_cookies(struct session *t, struct buffer *req)
cur_hdr->len = 0;
}
cur_next += delta;
txn->req.eoh += delta;
http_msg_move_end(&txn->req, delta);
}
/* keep the link from this header to next one */
@ -4193,15 +4198,14 @@ int apply_filter_to_resp_headers(struct session *t, struct buffer *rtr, struct h
cur_end += delta;
cur_next += delta;
cur_hdr->len += delta;
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
break;
case ACT_REMOVE:
delta = buffer_replace2(rtr, cur_ptr, cur_next, NULL, 0);
cur_next += delta;
/* FIXME: this should be a separate function */
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
txn->hdr_idx.v[old_idx].next = cur_hdr->next;
txn->hdr_idx.used--;
cur_hdr->len = 0;
@ -4280,7 +4284,7 @@ int apply_filter_to_sts_line(struct session *t, struct buffer *rtr, struct hdr_e
* will not be counted as a new header.
*/
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
cur_end += delta;
txn->rsp.sol = rtr->data + txn->rsp.som; /* should be equal to txn->sol */
@ -4462,7 +4466,7 @@ void manage_server_side_cookies(struct session *t, struct buffer *rtr)
txn->hdr_idx.used--;
cur_hdr->len = 0;
cur_next += delta;
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
txn->flags |= TX_SCK_DELETED;
}
@ -4474,7 +4478,7 @@ void manage_server_side_cookies(struct session *t, struct buffer *rtr)
delta = buffer_replace2(rtr, p3, p4, t->srv->cookie, t->srv->cklen);
cur_hdr->len += delta;
cur_next += delta;
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
txn->flags |= TX_SCK_INSERTED | TX_SCK_DELETED;
}
@ -4486,7 +4490,7 @@ void manage_server_side_cookies(struct session *t, struct buffer *rtr)
delta = buffer_replace2(rtr, p3, p3, t->srv->cookie, t->srv->cklen + 1);
cur_hdr->len += delta;
cur_next += delta;
txn->rsp.eoh += delta;
http_msg_move_end(&txn->rsp, delta);
p3[t->srv->cklen] = COOKIE_DELIM;
txn->flags |= TX_SCK_INSERTED | TX_SCK_DELETED;