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326e27ed08
This is the legacy HTTP/1 state, it's never used from within h1 users, let's move it to proto_http with the rest of the legacy code.
248 lines
7.8 KiB
C
248 lines
7.8 KiB
C
/*
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* include/proto/h1.h
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* This file contains HTTP/1 protocol definitions.
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*
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* Copyright (C) 2000-2017 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_H1_H
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#define _PROTO_H1_H
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#include <common/buffer.h>
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#include <common/compiler.h>
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#include <common/config.h>
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#include <common/http.h>
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#include <common/http-hdr.h>
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#include <common/standard.h>
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#include <types/h1.h>
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int h1_headers_to_hdr_list(char *start, const char *stop,
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struct http_hdr *hdr, unsigned int hdr_num,
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struct h1m *h1m, union h1_sl *slp);
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int h1_measure_trailers(const struct buffer *buf, unsigned int ofs, unsigned int max);
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int h1_parse_cont_len_header(struct h1m *h1m, struct ist *value);
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void h1_parse_xfer_enc_header(struct h1m *h1m, struct ist value);
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void h1_parse_connection_header(struct h1m *h1m, struct ist value);
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/* for debugging, reports the HTTP/1 message state name */
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static inline const char *h1m_state_str(enum h1m_state msg_state)
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{
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switch (msg_state) {
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case H1_MSG_RQBEFORE: return "MSG_RQBEFORE";
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case H1_MSG_RQBEFORE_CR: return "MSG_RQBEFORE_CR";
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case H1_MSG_RQMETH: return "MSG_RQMETH";
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case H1_MSG_RQMETH_SP: return "MSG_RQMETH_SP";
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case H1_MSG_RQURI: return "MSG_RQURI";
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case H1_MSG_RQURI_SP: return "MSG_RQURI_SP";
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case H1_MSG_RQVER: return "MSG_RQVER";
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case H1_MSG_RQLINE_END: return "MSG_RQLINE_END";
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case H1_MSG_RPBEFORE: return "MSG_RPBEFORE";
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case H1_MSG_RPBEFORE_CR: return "MSG_RPBEFORE_CR";
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case H1_MSG_RPVER: return "MSG_RPVER";
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case H1_MSG_RPVER_SP: return "MSG_RPVER_SP";
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case H1_MSG_RPCODE: return "MSG_RPCODE";
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case H1_MSG_RPCODE_SP: return "MSG_RPCODE_SP";
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case H1_MSG_RPREASON: return "MSG_RPREASON";
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case H1_MSG_RPLINE_END: return "MSG_RPLINE_END";
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case H1_MSG_HDR_FIRST: return "MSG_HDR_FIRST";
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case H1_MSG_HDR_NAME: return "MSG_HDR_NAME";
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case H1_MSG_HDR_COL: return "MSG_HDR_COL";
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case H1_MSG_HDR_L1_SP: return "MSG_HDR_L1_SP";
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case H1_MSG_HDR_L1_LF: return "MSG_HDR_L1_LF";
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case H1_MSG_HDR_L1_LWS: return "MSG_HDR_L1_LWS";
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case H1_MSG_HDR_VAL: return "MSG_HDR_VAL";
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case H1_MSG_HDR_L2_LF: return "MSG_HDR_L2_LF";
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case H1_MSG_HDR_L2_LWS: return "MSG_HDR_L2_LWS";
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case H1_MSG_LAST_LF: return "MSG_LAST_LF";
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case H1_MSG_CHUNK_SIZE: return "MSG_CHUNK_SIZE";
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case H1_MSG_DATA: return "MSG_DATA";
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case H1_MSG_CHUNK_CRLF: return "MSG_CHUNK_CRLF";
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case H1_MSG_TRAILERS: return "MSG_TRAILERS";
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case H1_MSG_DONE: return "MSG_DONE";
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case H1_MSG_TUNNEL: return "MSG_TUNNEL";
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default: return "MSG_??????";
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}
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}
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/* This function may be called only in HTTP_MSG_CHUNK_CRLF. It reads the CRLF or
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* a possible LF alone at the end of a chunk. The caller should adjust msg->next
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* in order to include this part into the next forwarding phase. Note that the
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* caller must ensure that head+start points to the first byte to parse. It
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* returns the number of bytes parsed on success, so the caller can set msg_state
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* to HTTP_MSG_CHUNK_SIZE. If not enough data are available, the function does not
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* change anything and returns zero. Otherwise it returns a negative value
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* indicating the error positionn relative to <stop>. Note: this function is
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* designed to parse wrapped CRLF at the end of the buffer.
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*/
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static inline int h1_skip_chunk_crlf(const struct buffer *buf, int start, int stop)
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{
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const char *ptr = b_peek(buf, start);
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int bytes = 1;
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/* NB: we'll check data availability at the end. It's not a
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* problem because whatever we match first will be checked
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* against the correct length.
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*/
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if (*ptr == '\r') {
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bytes++;
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ptr++;
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if (ptr >= b_wrap(buf))
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ptr = b_orig(buf);
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}
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if (bytes > stop - start)
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return 0;
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if (*ptr != '\n') // negative position to stop
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return ptr - __b_peek(buf, stop);
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return bytes;
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}
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/* Parse the chunk size start at buf + start and stops before buf + stop. The
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* positions are relative to the buffer's head.
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* It returns the chunk size in <res> and the amount of bytes read this way :
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* < 0 : error at this position relative to <stop>
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* = 0 : not enough bytes to read a complete chunk size
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* > 0 : number of bytes successfully read that the caller can skip
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* On success, the caller should adjust its msg->next to point to the first
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* byte of data after the chunk size, so that we know we can forward exactly
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* msg->next bytes, and msg->sol to contain the exact number of bytes forming
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* the chunk size. That way it is always possible to differentiate between the
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* start of the body and the start of the data. Note: this function is designed
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* to parse wrapped CRLF at the end of the buffer.
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*/
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static inline int h1_parse_chunk_size(const struct buffer *buf, int start, int stop, unsigned int *res)
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{
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const char *ptr = b_peek(buf, start);
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const char *ptr_old = ptr;
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const char *end = b_wrap(buf);
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unsigned int chunk = 0;
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stop -= start; // bytes left
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start = stop; // bytes to transfer
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/* The chunk size is in the following form, though we are only
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* interested in the size and CRLF :
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* 1*HEXDIGIT *WSP *[ ';' extensions ] CRLF
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*/
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while (1) {
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int c;
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if (!stop)
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return 0;
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c = hex2i(*ptr);
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if (c < 0) /* not a hex digit anymore */
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break;
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if (unlikely(++ptr >= end))
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ptr = b_orig(buf);
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if (unlikely(chunk & 0xF8000000)) /* integer overflow will occur if result >= 2GB */
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goto error;
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chunk = (chunk << 4) + c;
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stop--;
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}
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/* empty size not allowed */
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if (unlikely(ptr == ptr_old))
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goto error;
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while (HTTP_IS_SPHT(*ptr)) {
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if (++ptr >= end)
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ptr = b_orig(buf);
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if (--stop == 0)
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return 0;
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}
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/* Up to there, we know that at least one byte is present at *ptr. Check
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* for the end of chunk size.
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*/
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while (1) {
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if (likely(HTTP_IS_CRLF(*ptr))) {
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/* we now have a CR or an LF at ptr */
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if (likely(*ptr == '\r')) {
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if (++ptr >= end)
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ptr = b_orig(buf);
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if (--stop == 0)
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return 0;
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}
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if (*ptr != '\n')
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goto error;
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if (++ptr >= end)
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ptr = b_orig(buf);
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--stop;
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/* done */
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break;
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}
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else if (likely(*ptr == ';')) {
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/* chunk extension, ends at next CRLF */
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if (++ptr >= end)
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ptr = b_orig(buf);
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if (--stop == 0)
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return 0;
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while (!HTTP_IS_CRLF(*ptr)) {
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if (++ptr >= end)
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ptr = b_orig(buf);
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if (--stop == 0)
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return 0;
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}
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/* we have a CRLF now, loop above */
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continue;
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}
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else
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goto error;
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}
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/* OK we found our CRLF and now <ptr> points to the next byte, which may
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* or may not be present. Let's return the number of bytes parsed.
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*/
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*res = chunk;
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return start - stop;
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error:
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*res = 0; // just to stop gcc's -Wuninitialized warning :-(
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return -stop;
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}
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/* initializes an H1 message for a request */
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static inline struct h1m *h1m_init_req(struct h1m *h1m)
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{
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h1m->state = H1_MSG_RQBEFORE;
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h1m->next = 0;
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h1m->flags = H1_MF_NONE;
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h1m->curr_len = 0;
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h1m->body_len = 0;
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h1m->err_pos = -2;
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h1m->err_state = 0;
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return h1m;
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}
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/* initializes an H1 message for a response */
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static inline struct h1m *h1m_init_res(struct h1m *h1m)
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{
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h1m->state = H1_MSG_RPBEFORE;
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h1m->next = 0;
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h1m->flags = H1_MF_RESP;
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h1m->curr_len = 0;
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h1m->body_len = 0;
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h1m->err_pos = -2;
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h1m->err_state = 0;
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return h1m;
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}
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#endif /* _PROTO_H1_H */
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