blob: d3a20c2ed263f2285f44b5e24862a18db6633b2f [file] [log] [blame]
/*
* HTTP/1 protocol analyzer
*
* Copyright 2000-2017 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <ctype.h>
#include <common/config.h>
#include <common/http-hdr.h>
#include <proto/h1.h>
#include <proto/hdr_idx.h>
/* It is about twice as fast on recent architectures to lookup a byte in a
* table than to perform a boolean AND or OR between two tests. Refer to
* RFC2616/RFC5234/RFC7230 for those chars. A token is any ASCII char that is
* neither a separator nor a CTL char. An http ver_token is any ASCII which can
* be found in an HTTP version, which includes 'H', 'T', 'P', '/', '.' and any
* digit. Note: please do not overwrite values in assignment since gcc-2.95
* will not handle them correctly. It's worth noting that chars 128..255 are
* nothing, not even control chars.
*/
const unsigned char h1_char_classes[256] = {
[ 0] = H1_FLG_CTL,
[ 1] = H1_FLG_CTL,
[ 2] = H1_FLG_CTL,
[ 3] = H1_FLG_CTL,
[ 4] = H1_FLG_CTL,
[ 5] = H1_FLG_CTL,
[ 6] = H1_FLG_CTL,
[ 7] = H1_FLG_CTL,
[ 8] = H1_FLG_CTL,
[ 9] = H1_FLG_SPHT | H1_FLG_LWS | H1_FLG_SEP | H1_FLG_CTL,
[ 10] = H1_FLG_CRLF | H1_FLG_LWS | H1_FLG_CTL,
[ 11] = H1_FLG_CTL,
[ 12] = H1_FLG_CTL,
[ 13] = H1_FLG_CRLF | H1_FLG_LWS | H1_FLG_CTL,
[ 14] = H1_FLG_CTL,
[ 15] = H1_FLG_CTL,
[ 16] = H1_FLG_CTL,
[ 17] = H1_FLG_CTL,
[ 18] = H1_FLG_CTL,
[ 19] = H1_FLG_CTL,
[ 20] = H1_FLG_CTL,
[ 21] = H1_FLG_CTL,
[ 22] = H1_FLG_CTL,
[ 23] = H1_FLG_CTL,
[ 24] = H1_FLG_CTL,
[ 25] = H1_FLG_CTL,
[ 26] = H1_FLG_CTL,
[ 27] = H1_FLG_CTL,
[ 28] = H1_FLG_CTL,
[ 29] = H1_FLG_CTL,
[ 30] = H1_FLG_CTL,
[ 31] = H1_FLG_CTL,
[' '] = H1_FLG_SPHT | H1_FLG_LWS | H1_FLG_SEP,
['!'] = H1_FLG_TOK,
['"'] = H1_FLG_SEP,
['#'] = H1_FLG_TOK,
['$'] = H1_FLG_TOK,
['%'] = H1_FLG_TOK,
['&'] = H1_FLG_TOK,
[ 39] = H1_FLG_TOK,
['('] = H1_FLG_SEP,
[')'] = H1_FLG_SEP,
['*'] = H1_FLG_TOK,
['+'] = H1_FLG_TOK,
[','] = H1_FLG_SEP,
['-'] = H1_FLG_TOK,
['.'] = H1_FLG_TOK | H1_FLG_VER,
['/'] = H1_FLG_SEP | H1_FLG_VER,
['0'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['1'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['2'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['3'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['4'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['5'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['6'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['7'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['8'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
['9'] = H1_FLG_TOK | H1_FLG_VER | H1_FLG_DIG,
[':'] = H1_FLG_SEP,
[';'] = H1_FLG_SEP,
['<'] = H1_FLG_SEP,
['='] = H1_FLG_SEP,
['>'] = H1_FLG_SEP,
['?'] = H1_FLG_SEP,
['@'] = H1_FLG_SEP,
['A'] = H1_FLG_TOK,
['B'] = H1_FLG_TOK,
['C'] = H1_FLG_TOK,
['D'] = H1_FLG_TOK,
['E'] = H1_FLG_TOK,
['F'] = H1_FLG_TOK,
['G'] = H1_FLG_TOK,
['H'] = H1_FLG_TOK | H1_FLG_VER,
['I'] = H1_FLG_TOK,
['J'] = H1_FLG_TOK,
['K'] = H1_FLG_TOK,
['L'] = H1_FLG_TOK,
['M'] = H1_FLG_TOK,
['N'] = H1_FLG_TOK,
['O'] = H1_FLG_TOK,
['P'] = H1_FLG_TOK | H1_FLG_VER,
['Q'] = H1_FLG_TOK,
['R'] = H1_FLG_TOK | H1_FLG_VER,
['S'] = H1_FLG_TOK | H1_FLG_VER,
['T'] = H1_FLG_TOK | H1_FLG_VER,
['U'] = H1_FLG_TOK,
['V'] = H1_FLG_TOK,
['W'] = H1_FLG_TOK,
['X'] = H1_FLG_TOK,
['Y'] = H1_FLG_TOK,
['Z'] = H1_FLG_TOK,
['['] = H1_FLG_SEP,
[ 92] = H1_FLG_SEP,
[']'] = H1_FLG_SEP,
['^'] = H1_FLG_TOK,
['_'] = H1_FLG_TOK,
['`'] = H1_FLG_TOK,
['a'] = H1_FLG_TOK,
['b'] = H1_FLG_TOK,
['c'] = H1_FLG_TOK,
['d'] = H1_FLG_TOK,
['e'] = H1_FLG_TOK,
['f'] = H1_FLG_TOK,
['g'] = H1_FLG_TOK,
['h'] = H1_FLG_TOK,
['i'] = H1_FLG_TOK,
['j'] = H1_FLG_TOK,
['k'] = H1_FLG_TOK,
['l'] = H1_FLG_TOK,
['m'] = H1_FLG_TOK,
['n'] = H1_FLG_TOK,
['o'] = H1_FLG_TOK,
['p'] = H1_FLG_TOK,
['q'] = H1_FLG_TOK,
['r'] = H1_FLG_TOK,
['s'] = H1_FLG_TOK,
['t'] = H1_FLG_TOK,
['u'] = H1_FLG_TOK,
['v'] = H1_FLG_TOK,
['w'] = H1_FLG_TOK,
['x'] = H1_FLG_TOK,
['y'] = H1_FLG_TOK,
['z'] = H1_FLG_TOK,
['{'] = H1_FLG_SEP,
['|'] = H1_FLG_TOK,
['}'] = H1_FLG_SEP,
['~'] = H1_FLG_TOK,
[127] = H1_FLG_CTL,
};
/*
* This function parses a status line between <ptr> and <end>, starting with
* parser state <state>. Only states HTTP_MSG_RPVER, HTTP_MSG_RPVER_SP,
* HTTP_MSG_RPCODE, HTTP_MSG_RPCODE_SP and HTTP_MSG_RPREASON are handled. Others
* will give undefined results.
* Note that it is upon the caller's responsibility to ensure that ptr < end,
* and that msg->sol points to the beginning of the response.
* If a complete line is found (which implies that at least one CR or LF is
* found before <end>, the updated <ptr> is returned, otherwise NULL is
* returned indicating an incomplete line (which does not mean that parts have
* not been updated). In the incomplete case, if <ret_ptr> or <ret_state> are
* non-NULL, they are fed with the new <ptr> and <state> values to be passed
* upon next call.
*
* This function was intentionally designed to be called from
* http_msg_analyzer() with the lowest overhead. It should integrate perfectly
* within its state machine and use the same macros, hence the need for same
* labels and variable names. Note that msg->sol is left unchanged.
*/
const char *http_parse_stsline(struct http_msg *msg,
enum h1_state state, const char *ptr, const char *end,
unsigned int *ret_ptr, enum h1_state *ret_state)
{
const char *msg_start = msg->chn->buf->p;
switch (state) {
case HTTP_MSG_RPVER:
http_msg_rpver:
if (likely(HTTP_IS_VER_TOKEN(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver, http_msg_ood, state, HTTP_MSG_RPVER);
if (likely(HTTP_IS_SPHT(*ptr))) {
msg->sl.st.v_l = ptr - msg_start;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver_sp, http_msg_ood, state, HTTP_MSG_RPVER_SP);
}
msg->err_state = HTTP_MSG_RPVER;
state = HTTP_MSG_ERROR;
break;
case HTTP_MSG_RPVER_SP:
http_msg_rpver_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
msg->sl.st.c = ptr - msg_start;
goto http_msg_rpcode;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver_sp, http_msg_ood, state, HTTP_MSG_RPVER_SP);
/* so it's a CR/LF, this is invalid */
msg->err_state = HTTP_MSG_RPVER_SP;
state = HTTP_MSG_ERROR;
break;
case HTTP_MSG_RPCODE:
http_msg_rpcode:
if (likely(!HTTP_IS_LWS(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode, http_msg_ood, state, HTTP_MSG_RPCODE);
if (likely(HTTP_IS_SPHT(*ptr))) {
msg->sl.st.c_l = ptr - msg_start - msg->sl.st.c;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode_sp, http_msg_ood, state, HTTP_MSG_RPCODE_SP);
}
/* so it's a CR/LF, so there is no reason phrase */
msg->sl.st.c_l = ptr - msg_start - msg->sl.st.c;
http_msg_rsp_reason:
/* FIXME: should we support HTTP responses without any reason phrase ? */
msg->sl.st.r = ptr - msg_start;
msg->sl.st.r_l = 0;
goto http_msg_rpline_eol;
case HTTP_MSG_RPCODE_SP:
http_msg_rpcode_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
msg->sl.st.r = ptr - msg_start;
goto http_msg_rpreason;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode_sp, http_msg_ood, state, HTTP_MSG_RPCODE_SP);
/* so it's a CR/LF, so there is no reason phrase */
goto http_msg_rsp_reason;
case HTTP_MSG_RPREASON:
http_msg_rpreason:
if (likely(!HTTP_IS_CRLF(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpreason, http_msg_ood, state, HTTP_MSG_RPREASON);
msg->sl.st.r_l = ptr - msg_start - msg->sl.st.r;
http_msg_rpline_eol:
/* We have seen the end of line. Note that we do not
* necessarily have the \n yet, but at least we know that we
* have EITHER \r OR \n, otherwise the response would not be
* complete. We can then record the response length and return
* to the caller which will be able to register it.
*/
msg->sl.st.l = ptr - msg_start - msg->sol;
return ptr;
default:
#ifdef DEBUG_FULL
fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
exit(1);
#endif
;
}
http_msg_ood:
/* out of valid data */
if (ret_state)
*ret_state = state;
if (ret_ptr)
*ret_ptr = ptr - msg_start;
return NULL;
}
/*
* This function parses a request line between <ptr> and <end>, starting with
* parser state <state>. Only states HTTP_MSG_RQMETH, HTTP_MSG_RQMETH_SP,
* HTTP_MSG_RQURI, HTTP_MSG_RQURI_SP and HTTP_MSG_RQVER are handled. Others
* will give undefined results.
* Note that it is upon the caller's responsibility to ensure that ptr < end,
* and that msg->sol points to the beginning of the request.
* If a complete line is found (which implies that at least one CR or LF is
* found before <end>, the updated <ptr> is returned, otherwise NULL is
* returned indicating an incomplete line (which does not mean that parts have
* not been updated). In the incomplete case, if <ret_ptr> or <ret_state> are
* non-NULL, they are fed with the new <ptr> and <state> values to be passed
* upon next call.
*
* This function was intentionally designed to be called from
* http_msg_analyzer() with the lowest overhead. It should integrate perfectly
* within its state machine and use the same macros, hence the need for same
* labels and variable names. Note that msg->sol is left unchanged.
*/
const char *http_parse_reqline(struct http_msg *msg,
enum h1_state state, const char *ptr, const char *end,
unsigned int *ret_ptr, enum h1_state *ret_state)
{
const char *msg_start = msg->chn->buf->p;
switch (state) {
case HTTP_MSG_RQMETH:
http_msg_rqmeth:
if (likely(HTTP_IS_TOKEN(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqmeth, http_msg_ood, state, HTTP_MSG_RQMETH);
if (likely(HTTP_IS_SPHT(*ptr))) {
msg->sl.rq.m_l = ptr - msg_start;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqmeth_sp, http_msg_ood, state, HTTP_MSG_RQMETH_SP);
}
if (likely(HTTP_IS_CRLF(*ptr))) {
/* HTTP 0.9 request */
msg->sl.rq.m_l = ptr - msg_start;
http_msg_req09_uri:
msg->sl.rq.u = ptr - msg_start;
http_msg_req09_uri_e:
msg->sl.rq.u_l = ptr - msg_start - msg->sl.rq.u;
http_msg_req09_ver:
msg->sl.rq.v = ptr - msg_start;
msg->sl.rq.v_l = 0;
goto http_msg_rqline_eol;
}
msg->err_state = HTTP_MSG_RQMETH;
state = HTTP_MSG_ERROR;
break;
case HTTP_MSG_RQMETH_SP:
http_msg_rqmeth_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
msg->sl.rq.u = ptr - msg_start;
goto http_msg_rquri;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqmeth_sp, http_msg_ood, state, HTTP_MSG_RQMETH_SP);
/* so it's a CR/LF, meaning an HTTP 0.9 request */
goto http_msg_req09_uri;
case HTTP_MSG_RQURI:
http_msg_rquri:
#if defined(__x86_64__) || \
defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__ARM_ARCH_7A__)
/* speedup: skip bytes not between 0x21 and 0x7e inclusive */
while (ptr <= end - sizeof(int)) {
int x = *(int *)ptr - 0x21212121;
if (x & 0x80808080)
break;
x -= 0x5e5e5e5e;
if (!(x & 0x80808080))
break;
ptr += sizeof(int);
}
#endif
if (ptr >= end) {
state = HTTP_MSG_RQURI;
goto http_msg_ood;
}
http_msg_rquri2:
if (likely((unsigned char)(*ptr - 33) <= 93)) /* 33 to 126 included */
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rquri2, http_msg_ood, state, HTTP_MSG_RQURI);
if (likely(HTTP_IS_SPHT(*ptr))) {
msg->sl.rq.u_l = ptr - msg_start - msg->sl.rq.u;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rquri_sp, http_msg_ood, state, HTTP_MSG_RQURI_SP);
}
if (likely((unsigned char)*ptr >= 128)) {
/* non-ASCII chars are forbidden unless option
* accept-invalid-http-request is enabled in the frontend.
* In any case, we capture the faulty char.
*/
if (msg->err_pos < -1)
goto invalid_char;
if (msg->err_pos == -1)
msg->err_pos = ptr - msg_start;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rquri, http_msg_ood, state, HTTP_MSG_RQURI);
}
if (likely(HTTP_IS_CRLF(*ptr))) {
/* so it's a CR/LF, meaning an HTTP 0.9 request */
goto http_msg_req09_uri_e;
}
/* OK forbidden chars, 0..31 or 127 */
invalid_char:
msg->err_pos = ptr - msg_start;
msg->err_state = HTTP_MSG_RQURI;
state = HTTP_MSG_ERROR;
break;
case HTTP_MSG_RQURI_SP:
http_msg_rquri_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
msg->sl.rq.v = ptr - msg_start;
goto http_msg_rqver;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rquri_sp, http_msg_ood, state, HTTP_MSG_RQURI_SP);
/* so it's a CR/LF, meaning an HTTP 0.9 request */
goto http_msg_req09_ver;
case HTTP_MSG_RQVER:
http_msg_rqver:
if (likely(HTTP_IS_VER_TOKEN(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqver, http_msg_ood, state, HTTP_MSG_RQVER);
if (likely(HTTP_IS_CRLF(*ptr))) {
msg->sl.rq.v_l = ptr - msg_start - msg->sl.rq.v;
http_msg_rqline_eol:
/* We have seen the end of line. Note that we do not
* necessarily have the \n yet, but at least we know that we
* have EITHER \r OR \n, otherwise the request would not be
* complete. We can then record the request length and return
* to the caller which will be able to register it.
*/
msg->sl.rq.l = ptr - msg_start - msg->sol;
return ptr;
}
/* neither an HTTP_VER token nor a CRLF */
msg->err_state = HTTP_MSG_RQVER;
state = HTTP_MSG_ERROR;
break;
default:
#ifdef DEBUG_FULL
fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
exit(1);
#endif
;
}
http_msg_ood:
/* out of valid data */
if (ret_state)
*ret_state = state;
if (ret_ptr)
*ret_ptr = ptr - msg_start;
return NULL;
}
/*
* This function parses an HTTP message, either a request or a response,
* depending on the initial msg->msg_state. The caller is responsible for
* ensuring that the message does not wrap. The function can be preempted
* everywhere when data are missing and recalled at the exact same location
* with no information loss. The message may even be realigned between two
* calls. The header index is re-initialized when switching from
* MSG_R[PQ]BEFORE to MSG_RPVER|MSG_RQMETH. It modifies msg->sol among other
* fields. Note that msg->sol will be initialized after completing the first
* state, so that none of the msg pointers has to be initialized prior to the
* first call.
*/
void http_msg_analyzer(struct http_msg *msg, struct hdr_idx *idx)
{
enum h1_state state; /* updated only when leaving the FSM */
register char *ptr, *end; /* request pointers, to avoid dereferences */
struct buffer *buf;
state = msg->msg_state;
buf = msg->chn->buf;
ptr = buf->p + msg->next;
end = buf->p + buf->i;
if (unlikely(ptr >= end))
goto http_msg_ood;
switch (state) {
/*
* First, states that are specific to the response only.
* We check them first so that request and headers are
* closer to each other (accessed more often).
*/
case HTTP_MSG_RPBEFORE:
http_msg_rpbefore:
if (likely(HTTP_IS_TOKEN(*ptr))) {
/* we have a start of message, but we have to check
* first if we need to remove some CRLF. We can only
* do this when o=0.
*/
if (unlikely(ptr != buf->p)) {
if (buf->o)
goto http_msg_ood;
/* Remove empty leading lines, as recommended by RFC2616. */
bi_fast_delete(buf, ptr - buf->p);
}
msg->sol = 0;
msg->sl.st.l = 0; /* used in debug mode */
hdr_idx_init(idx);
state = HTTP_MSG_RPVER;
goto http_msg_rpver;
}
if (unlikely(!HTTP_IS_CRLF(*ptr))) {
state = HTTP_MSG_RPBEFORE;
goto http_msg_invalid;
}
if (unlikely(*ptr == '\n'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore, http_msg_ood, state, HTTP_MSG_RPBEFORE);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore_cr, http_msg_ood, state, HTTP_MSG_RPBEFORE_CR);
/* stop here */
case HTTP_MSG_RPBEFORE_CR:
http_msg_rpbefore_cr:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RPBEFORE_CR);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore, http_msg_ood, state, HTTP_MSG_RPBEFORE);
/* stop here */
case HTTP_MSG_RPVER:
http_msg_rpver:
case HTTP_MSG_RPVER_SP:
case HTTP_MSG_RPCODE:
case HTTP_MSG_RPCODE_SP:
case HTTP_MSG_RPREASON:
ptr = (char *)http_parse_stsline(msg,
state, ptr, end,
&msg->next, &msg->msg_state);
if (unlikely(!ptr))
return;
/* we have a full response and we know that we have either a CR
* or an LF at <ptr>.
*/
hdr_idx_set_start(idx, msg->sl.st.l, *ptr == '\r');
msg->sol = ptr - buf->p;
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpline_end, http_msg_ood, state, HTTP_MSG_RPLINE_END);
goto http_msg_rpline_end;
case HTTP_MSG_RPLINE_END:
http_msg_rpline_end:
/* msg->sol must point to the first of CR or LF. */
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RPLINE_END);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_first, http_msg_ood, state, HTTP_MSG_HDR_FIRST);
/* stop here */
/*
* Second, states that are specific to the request only
*/
case HTTP_MSG_RQBEFORE:
http_msg_rqbefore:
if (likely(HTTP_IS_TOKEN(*ptr))) {
/* we have a start of message, but we have to check
* first if we need to remove some CRLF. We can only
* do this when o=0.
*/
if (likely(ptr != buf->p)) {
if (buf->o)
goto http_msg_ood;
/* Remove empty leading lines, as recommended by RFC2616. */
bi_fast_delete(buf, ptr - buf->p);
}
msg->sol = 0;
msg->sl.rq.l = 0; /* used in debug mode */
state = HTTP_MSG_RQMETH;
goto http_msg_rqmeth;
}
if (unlikely(!HTTP_IS_CRLF(*ptr))) {
state = HTTP_MSG_RQBEFORE;
goto http_msg_invalid;
}
if (unlikely(*ptr == '\n'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqbefore, http_msg_ood, state, HTTP_MSG_RQBEFORE);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqbefore_cr, http_msg_ood, state, HTTP_MSG_RQBEFORE_CR);
/* stop here */
case HTTP_MSG_RQBEFORE_CR:
http_msg_rqbefore_cr:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RQBEFORE_CR);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqbefore, http_msg_ood, state, HTTP_MSG_RQBEFORE);
/* stop here */
case HTTP_MSG_RQMETH:
http_msg_rqmeth:
case HTTP_MSG_RQMETH_SP:
case HTTP_MSG_RQURI:
case HTTP_MSG_RQURI_SP:
case HTTP_MSG_RQVER:
ptr = (char *)http_parse_reqline(msg,
state, ptr, end,
&msg->next, &msg->msg_state);
if (unlikely(!ptr))
return;
/* we have a full request and we know that we have either a CR
* or an LF at <ptr>.
*/
hdr_idx_set_start(idx, msg->sl.rq.l, *ptr == '\r');
msg->sol = ptr - buf->p;
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rqline_end, http_msg_ood, state, HTTP_MSG_RQLINE_END);
goto http_msg_rqline_end;
case HTTP_MSG_RQLINE_END:
http_msg_rqline_end:
/* check for HTTP/0.9 request : no version information available.
* msg->sol must point to the first of CR or LF.
*/
if (unlikely(msg->sl.rq.v_l == 0))
goto http_msg_last_lf;
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RQLINE_END);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_first, http_msg_ood, state, HTTP_MSG_HDR_FIRST);
/* stop here */
/*
* Common states below
*/
case HTTP_MSG_HDR_FIRST:
http_msg_hdr_first:
msg->sol = ptr - buf->p;
if (likely(!HTTP_IS_CRLF(*ptr))) {
goto http_msg_hdr_name;
}
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_last_lf, http_msg_ood, state, HTTP_MSG_LAST_LF);
goto http_msg_last_lf;
case HTTP_MSG_HDR_NAME:
http_msg_hdr_name:
/* assumes msg->sol points to the first char */
if (likely(HTTP_IS_TOKEN(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_name, http_msg_ood, state, HTTP_MSG_HDR_NAME);
if (likely(*ptr == ':'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_sp, http_msg_ood, state, HTTP_MSG_HDR_L1_SP);
if (likely(msg->err_pos < -1) || *ptr == '\n') {
state = HTTP_MSG_HDR_NAME;
goto http_msg_invalid;
}
if (msg->err_pos == -1) /* capture error pointer */
msg->err_pos = ptr - buf->p; /* >= 0 now */
/* and we still accept this non-token character */
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_name, http_msg_ood, state, HTTP_MSG_HDR_NAME);
case HTTP_MSG_HDR_L1_SP:
http_msg_hdr_l1_sp:
/* assumes msg->sol points to the first char */
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_sp, http_msg_ood, state, HTTP_MSG_HDR_L1_SP);
/* header value can be basically anything except CR/LF */
msg->sov = ptr - buf->p;
if (likely(!HTTP_IS_CRLF(*ptr))) {
goto http_msg_hdr_val;
}
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_lf, http_msg_ood, state, HTTP_MSG_HDR_L1_LF);
goto http_msg_hdr_l1_lf;
case HTTP_MSG_HDR_L1_LF:
http_msg_hdr_l1_lf:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_HDR_L1_LF);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_lws, http_msg_ood, state, HTTP_MSG_HDR_L1_LWS);
case HTTP_MSG_HDR_L1_LWS:
http_msg_hdr_l1_lws:
if (likely(HTTP_IS_SPHT(*ptr))) {
/* replace HT,CR,LF with spaces */
for (; buf->p + msg->sov < ptr; msg->sov++)
buf->p[msg->sov] = ' ';
goto http_msg_hdr_l1_sp;
}
/* we had a header consisting only in spaces ! */
msg->eol = msg->sov;
goto http_msg_complete_header;
case HTTP_MSG_HDR_VAL:
http_msg_hdr_val:
/* assumes msg->sol points to the first char, and msg->sov
* points to the first character of the value.
*/
/* speedup: we'll skip packs of 4 or 8 bytes not containing bytes 0x0D
* and lower. In fact since most of the time is spent in the loop, we
* also remove the sign bit test so that bytes 0x8e..0x0d break the
* loop, but we don't care since they're very rare in header values.
*/
#if defined(__x86_64__)
while (ptr <= end - sizeof(long)) {
if ((*(long *)ptr - 0x0e0e0e0e0e0e0e0eULL) & 0x8080808080808080ULL)
goto http_msg_hdr_val2;
ptr += sizeof(long);
}
#endif
#if defined(__x86_64__) || \
defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__ARM_ARCH_7A__)
while (ptr <= end - sizeof(int)) {
if ((*(int*)ptr - 0x0e0e0e0e) & 0x80808080)
goto http_msg_hdr_val2;
ptr += sizeof(int);
}
#endif
if (ptr >= end) {
state = HTTP_MSG_HDR_VAL;
goto http_msg_ood;
}
http_msg_hdr_val2:
if (likely(!HTTP_IS_CRLF(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_val2, http_msg_ood, state, HTTP_MSG_HDR_VAL);
msg->eol = ptr - buf->p;
/* Note: we could also copy eol into ->eoh so that we have the
* real header end in case it ends with lots of LWS, but is this
* really needed ?
*/
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l2_lf, http_msg_ood, state, HTTP_MSG_HDR_L2_LF);
goto http_msg_hdr_l2_lf;
case HTTP_MSG_HDR_L2_LF:
http_msg_hdr_l2_lf:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_HDR_L2_LF);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l2_lws, http_msg_ood, state, HTTP_MSG_HDR_L2_LWS);
case HTTP_MSG_HDR_L2_LWS:
http_msg_hdr_l2_lws:
if (unlikely(HTTP_IS_SPHT(*ptr))) {
/* LWS: replace HT,CR,LF with spaces */
for (; buf->p + msg->eol < ptr; msg->eol++)
buf->p[msg->eol] = ' ';
goto http_msg_hdr_val;
}
http_msg_complete_header:
/*
* It was a new header, so the last one is finished.
* Assumes msg->sol points to the first char, msg->sov points
* to the first character of the value and msg->eol to the
* first CR or LF so we know how the line ends. We insert last
* header into the index.
*/
if (unlikely(hdr_idx_add(msg->eol - msg->sol, buf->p[msg->eol] == '\r',
idx, idx->tail) < 0)) {
state = HTTP_MSG_HDR_L2_LWS;
goto http_msg_invalid;
}
msg->sol = ptr - buf->p;
if (likely(!HTTP_IS_CRLF(*ptr))) {
goto http_msg_hdr_name;
}
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_last_lf, http_msg_ood, state, HTTP_MSG_LAST_LF);
goto http_msg_last_lf;
case HTTP_MSG_LAST_LF:
http_msg_last_lf:
/* Assumes msg->sol points to the first of either CR or LF.
* Sets ->sov and ->next to the total header length, ->eoh to
* the last CRLF, and ->eol to the last CRLF length (1 or 2).
*/
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_LAST_LF);
ptr++;
msg->sov = msg->next = ptr - buf->p;
msg->eoh = msg->sol;
msg->sol = 0;
msg->eol = msg->sov - msg->eoh;
msg->msg_state = HTTP_MSG_BODY;
return;
case HTTP_MSG_ERROR:
/* this may only happen if we call http_msg_analyser() twice with an error */
break;
default:
#ifdef DEBUG_FULL
fprintf(stderr, "FIXME !!!! impossible state at %s:%d = %d\n", __FILE__, __LINE__, state);
exit(1);
#endif
;
}
http_msg_ood:
/* out of data */
msg->msg_state = state;
msg->next = ptr - buf->p;
return;
http_msg_invalid:
/* invalid message */
msg->err_state = state;
msg->msg_state = HTTP_MSG_ERROR;
msg->next = ptr - buf->p;
return;
}
/* This function parses a contiguous HTTP/1 headers block starting at <start>
* and ending before <stop>, at once, and converts it a list of (name,value)
* pairs representing header fields into the array <hdr> of size <hdr_num>,
* whose last entry will have an empty name and an empty value. If <hdr_num> is
* too small to represent the whole message, an error is returned. If <h1m> is
* not NULL, some protocol elements such as content-length and transfer-encoding
* will be parsed and stored there as well.
*
* For now it's limited to the response. If the header block is incomplete,
* 0 is returned, waiting to be called again with more data to try it again.
*
* The code derived from the main HTTP/1 parser above but was simplified and
* optimized to process responses produced or forwarded by haproxy. The caller
* is responsible for ensuring that the message doesn't wrap, and should ensure
* it is complete to avoid having to retry the operation after a failed
* attempt. The message is not supposed to be invalid, which is why a few
* properties such as the character set used in the header field names are not
* checked. In case of an unparsable response message, a negative value will be
* returned with h1m->err_pos and h1m->err_state matching the location and
* state where the error was met. Leading blank likes are tolerated but not
* recommended.
*
* This function returns :
* -1 in case of error. In this case, h1m->err_state is filled (if h1m is
* set) with the state the error occurred in and h2-m>err_pos with the
* the position relative to <start>
* -2 if the output is full (hdr_num reached). err_state and err_pos also
* indicate where it failed.
* 0 in case of missing data.
* > 0 on success, it then corresponds to the number of bytes read since
* <start> so that the caller can go on with the payload.
*/
int h1_headers_to_hdr_list(char *start, const char *stop,
struct http_hdr *hdr, unsigned int hdr_num,
struct h1m *h1m)
{
enum h1_state state = HTTP_MSG_RPBEFORE;
register char *ptr = start;
register const char *end = stop;
unsigned int hdr_count = 0;
unsigned int code = 0; /* status code, ASCII form */
unsigned int st_c; /* beginning of status code, relative to msg_start */
unsigned int st_c_l; /* length of status code */
unsigned int sol = 0; /* start of line */
unsigned int col = 0; /* position of the colon */
unsigned int eol = 0; /* end of line */
unsigned int sov = 0; /* start of value */
unsigned int skip = 0; /* number of bytes skipped at the beginning */
struct ist n, v; /* header name and value during parsing */
if (unlikely(ptr >= end))
goto http_msg_ood;
switch (state) {
case HTTP_MSG_RPBEFORE:
http_msg_rpbefore:
if (likely(HTTP_IS_TOKEN(*ptr))) {
/* we have a start of message, we may have skipped some
* heading CRLF. Skip them now.
*/
skip += ptr - start;
start = ptr;
sol = 0;
hdr_count = 0;
state = HTTP_MSG_RPVER;
goto http_msg_rpver;
}
if (unlikely(!HTTP_IS_CRLF(*ptr))) {
state = HTTP_MSG_RPBEFORE;
goto http_msg_invalid;
}
if (unlikely(*ptr == '\n'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore, http_msg_ood, state, HTTP_MSG_RPBEFORE);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore_cr, http_msg_ood, state, HTTP_MSG_RPBEFORE_CR);
/* stop here */
case HTTP_MSG_RPBEFORE_CR:
http_msg_rpbefore_cr:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RPBEFORE_CR);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpbefore, http_msg_ood, state, HTTP_MSG_RPBEFORE);
/* stop here */
case HTTP_MSG_RPVER:
http_msg_rpver:
if (likely(HTTP_IS_VER_TOKEN(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver, http_msg_ood, state, HTTP_MSG_RPVER);
if (likely(HTTP_IS_SPHT(*ptr))) {
/* version length = ptr - start */
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver_sp, http_msg_ood, state, HTTP_MSG_RPVER_SP);
}
state = HTTP_MSG_RPVER;
goto http_msg_invalid;
case HTTP_MSG_RPVER_SP:
http_msg_rpver_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
code = 0;
st_c = ptr - start;
goto http_msg_rpcode;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpver_sp, http_msg_ood, state, HTTP_MSG_RPVER_SP);
/* so it's a CR/LF, this is invalid */
state = HTTP_MSG_RPVER_SP;
goto http_msg_invalid;
case HTTP_MSG_RPCODE:
http_msg_rpcode:
if (likely(HTTP_IS_DIGIT(*ptr))) {
code = code * 10 + *ptr - '0';
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode, http_msg_ood, state, HTTP_MSG_RPCODE);
}
if (unlikely(!HTTP_IS_LWS(*ptr))) {
state = HTTP_MSG_RPCODE;
goto http_msg_invalid;
}
if (likely(HTTP_IS_SPHT(*ptr))) {
st_c_l = ptr - start - st_c;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode_sp, http_msg_ood, state, HTTP_MSG_RPCODE_SP);
}
/* so it's a CR/LF, so there is no reason phrase */
st_c_l = ptr - start - st_c;
http_msg_rsp_reason:
/* reason = ptr - start; */
/* reason length = 0 */
goto http_msg_rpline_eol;
case HTTP_MSG_RPCODE_SP:
http_msg_rpcode_sp:
if (likely(!HTTP_IS_LWS(*ptr))) {
/* reason = ptr - start */
goto http_msg_rpreason;
}
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpcode_sp, http_msg_ood, state, HTTP_MSG_RPCODE_SP);
/* so it's a CR/LF, so there is no reason phrase */
goto http_msg_rsp_reason;
case HTTP_MSG_RPREASON:
http_msg_rpreason:
if (likely(!HTTP_IS_CRLF(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpreason, http_msg_ood, state, HTTP_MSG_RPREASON);
/* reason length = ptr - start - reason */
http_msg_rpline_eol:
/* We have seen the end of line. Note that we do not
* necessarily have the \n yet, but at least we know that we
* have EITHER \r OR \n, otherwise the response would not be
* complete. We can then record the response length and return
* to the caller which will be able to register it.
*/
if (unlikely(hdr_count >= hdr_num)) {
state = HTTP_MSG_RPREASON;
goto http_output_full;
}
http_set_hdr(&hdr[hdr_count++], ist(":status"), ist2(start + st_c, st_c_l));
if (h1m)
h1m->status = code;
sol = ptr - start;
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_rpline_end, http_msg_ood, state, HTTP_MSG_RPLINE_END);
goto http_msg_rpline_end;
case HTTP_MSG_RPLINE_END:
http_msg_rpline_end:
/* sol must point to the first of CR or LF. */
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_RPLINE_END);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_first, http_msg_ood, state, HTTP_MSG_HDR_FIRST);
/* stop here */
case HTTP_MSG_HDR_FIRST:
http_msg_hdr_first:
sol = ptr - start;
if (likely(!HTTP_IS_CRLF(*ptr))) {
goto http_msg_hdr_name;
}
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_last_lf, http_msg_ood, state, HTTP_MSG_LAST_LF);
goto http_msg_last_lf;
case HTTP_MSG_HDR_NAME:
http_msg_hdr_name:
/* assumes sol points to the first char */
if (likely(HTTP_IS_TOKEN(*ptr))) {
/* turn it to lower case if needed */
if (isupper((unsigned char)*ptr))
*ptr = tolower(*ptr);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_name, http_msg_ood, state, HTTP_MSG_HDR_NAME);
}
if (likely(*ptr == ':')) {
col = ptr - start;
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_sp, http_msg_ood, state, HTTP_MSG_HDR_L1_SP);
}
if (HTTP_IS_LWS(*ptr)) {
state = HTTP_MSG_HDR_NAME;
goto http_msg_invalid;
}
/* now we have a non-token character in the header field name,
* it's up to the H1 layer to have decided whether or not it
* was acceptable. If we find it here, it was considered
* acceptable due to configuration rules so we obey.
*/
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_name, http_msg_ood, state, HTTP_MSG_HDR_NAME);
case HTTP_MSG_HDR_L1_SP:
http_msg_hdr_l1_sp:
/* assumes sol points to the first char */
if (likely(HTTP_IS_SPHT(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_sp, http_msg_ood, state, HTTP_MSG_HDR_L1_SP);
/* header value can be basically anything except CR/LF */
sov = ptr - start;
if (likely(!HTTP_IS_CRLF(*ptr))) {
goto http_msg_hdr_val;
}
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_lf, http_msg_ood, state, HTTP_MSG_HDR_L1_LF);
goto http_msg_hdr_l1_lf;
case HTTP_MSG_HDR_L1_LF:
http_msg_hdr_l1_lf:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_HDR_L1_LF);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_lws, http_msg_ood, state, HTTP_MSG_HDR_L1_LWS);
case HTTP_MSG_HDR_L1_LWS:
http_msg_hdr_l1_lws:
if (likely(HTTP_IS_SPHT(*ptr))) {
/* replace HT,CR,LF with spaces */
for (; start + sov < ptr; sov++)
start[sov] = ' ';
goto http_msg_hdr_l1_sp;
}
/* we had a header consisting only in spaces ! */
eol = sov;
goto http_msg_complete_header;
case HTTP_MSG_HDR_VAL:
http_msg_hdr_val:
/* assumes sol points to the first char, and sov
* points to the first character of the value.
*/
/* speedup: we'll skip packs of 4 or 8 bytes not containing bytes 0x0D
* and lower. In fact since most of the time is spent in the loop, we
* also remove the sign bit test so that bytes 0x8e..0x0d break the
* loop, but we don't care since they're very rare in header values.
*/
#if defined(__x86_64__)
while (ptr <= end - sizeof(long)) {
if ((*(long *)ptr - 0x0e0e0e0e0e0e0e0eULL) & 0x8080808080808080ULL)
goto http_msg_hdr_val2;
ptr += sizeof(long);
}
#endif
#if defined(__x86_64__) || \
defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || \
defined(__ARM_ARCH_7A__)
while (ptr <= end - sizeof(int)) {
if ((*(int*)ptr - 0x0e0e0e0e) & 0x80808080)
goto http_msg_hdr_val2;
ptr += sizeof(int);
}
#endif
if (ptr >= end) {
state = HTTP_MSG_HDR_VAL;
goto http_msg_ood;
}
http_msg_hdr_val2:
if (likely(!HTTP_IS_CRLF(*ptr)))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_val2, http_msg_ood, state, HTTP_MSG_HDR_VAL);
eol = ptr - start;
/* Note: we could also copy eol into ->eoh so that we have the
* real header end in case it ends with lots of LWS, but is this
* really needed ?
*/
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l2_lf, http_msg_ood, state, HTTP_MSG_HDR_L2_LF);
goto http_msg_hdr_l2_lf;
case HTTP_MSG_HDR_L2_LF:
http_msg_hdr_l2_lf:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_HDR_L2_LF);
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l2_lws, http_msg_ood, state, HTTP_MSG_HDR_L2_LWS);
case HTTP_MSG_HDR_L2_LWS:
http_msg_hdr_l2_lws:
if (unlikely(HTTP_IS_SPHT(*ptr))) {
/* LWS: replace HT,CR,LF with spaces */
for (; start + eol < ptr; eol++)
start[eol] = ' ';
goto http_msg_hdr_val;
}
http_msg_complete_header:
/*
* It was a new header, so the last one is finished. Assumes
* <sol> points to the first char of the name, <col> to the
* colon, <sov> points to the first character of the value and
* <eol> to the first CR or LF so we know how the line ends. We
* will trim spaces around the value. It's possible to do it by
* adjusting <eol> and <sov> which are no more used after this.
* We can add the header field to the list.
*/
while (sov < eol && HTTP_IS_LWS(start[sov]))
sov++;
while (eol - 1 > sov && HTTP_IS_LWS(start[eol - 1]))
eol--;
n = ist2(start + sol, col - sol);
v = ist2(start + sov, eol - sov);
if (unlikely(hdr_count >= hdr_num)) {
state = HTTP_MSG_HDR_L2_LWS;
goto http_output_full;
}
http_set_hdr(&hdr[hdr_count++], n, v);
if (h1m) {
long long cl;
if (h1m->status >= 100 && h1m->status < 200)
h1m->curr_len = h1m->body_len = 0;
else if (h1m->status == 304 || h1m->status == 204) {
/* no contents, claim c-len is present and set to zero */
h1m->flags |= H1_MF_CLEN;
h1m->curr_len = h1m->body_len = 0;
}
else if (isteq(n, ist("transfer-encoding"))) {
h1m->flags &= ~H1_MF_CLEN;
h1m->flags |= H1_MF_CHNK;
}
else if (isteq(n, ist("content-length")) && !(h1m->flags & H1_MF_CHNK)) {
h1m->flags |= H1_MF_CLEN;
strl2llrc(v.ptr, v.len, &cl);
h1m->curr_len = h1m->body_len = cl;
}
}
sol = ptr - start;
if (likely(!HTTP_IS_CRLF(*ptr)))
goto http_msg_hdr_name;
if (likely(*ptr == '\r'))
EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_last_lf, http_msg_ood, state, HTTP_MSG_LAST_LF);
goto http_msg_last_lf;
case HTTP_MSG_LAST_LF:
http_msg_last_lf:
EXPECT_LF_HERE(ptr, http_msg_invalid, state, HTTP_MSG_LAST_LF);
ptr++;
/* <ptr> now points to the first byte of payload. If needed sol
* still points to the first of either CR or LF of the empty
* line ending the headers block.
*/
if (unlikely(hdr_count >= hdr_num)) {
state = HTTP_MSG_LAST_LF;
goto http_output_full;
}
http_set_hdr(&hdr[hdr_count++], ist(""), ist(""));
state = HTTP_MSG_BODY;
break;
default:
/* impossible states */
goto http_msg_invalid;
}
/* reaching here, we've parsed the whole message and the state is
* HTTP_MSG_BODY.
*/
return ptr - start + skip;
http_msg_ood:
/* out of data at <ptr> during state <state> */
return 0;
http_msg_invalid:
/* invalid message, error at <ptr> */
if (h1m) {
h1m->err_state = state;
h1m->err_pos = ptr - start + skip;
}
return -1;
http_output_full:
/* no more room to store the current header, error at <ptr> */
if (h1m) {
h1m->err_state = state;
h1m->err_pos = ptr - start + skip;
}
return -2;
}
/* This function performs a very minimal parsing of the trailers block present
* in the output part of <buf>, and returns the number of bytes to delete to
* skip the trailers. It may return 0 if it's missing some input data, or < 0
* in case of parse error (in which case the caller may have to decide how to
* proceed, possibly eating everything).
*/
int h1_measure_trailers(const struct buffer *buf)
{
int count = 0;
while (1) {
const char *p1 = NULL, *p2 = NULL;
const char *start = b_ptr(buf, (int)(count - buf->o));
const char *stop = bo_end(buf);
const char *ptr = start;
int bytes = 0;
/* scan current line and stop at LF or CRLF */
while (1) {
if (ptr == stop)
return 0;
if (*ptr == '\n') {
if (!p1)
p1 = ptr;
p2 = ptr;
break;
}
if (*ptr == '\r') {
if (p1)
return -1;
p1 = ptr;
}
ptr++;
if (ptr >= buf->data + buf->size)
ptr = buf->data;
}
/* after LF; point to beginning of next line */
p2++;
if (p2 >= buf->data + buf->size)
p2 = buf->data;
bytes = p2 - start;
if (bytes < 0)
bytes += buf->size;
count += bytes;
/* LF/CRLF at beginning of line => end of trailers at p2.
* Everything was scheduled for forwarding, there's nothing left
* from this message. */
if (p1 == start)
break;
/* OK, next line then */
}
return count;
}
/* This function skips trailers in the buffer associated with HTTP message
* <msg>. The first visited position is msg->next. If the end of the trailers is
* found, the function returns >0. So, the caller can automatically schedul it
* to be forwarded, and switch msg->msg_state to HTTP_MSG_DONE. If not enough
* data are available, the function does not change anything except maybe
* msg->sol if it could parse some lines, and returns zero. If a parse error
* is encountered, the function returns < 0 and does not change anything except
* maybe msg->sol. Note that the message must already be in HTTP_MSG_TRAILERS
* state before calling this function, which implies that all non-trailers data
* have already been scheduled for forwarding, and that msg->next exactly
* matches the length of trailers already parsed and not forwarded. It is also
* important to note that this function is designed to be able to parse wrapped
* headers at end of buffer.
*/
int http_forward_trailers(struct http_msg *msg)
{
const struct buffer *buf = msg->chn->buf;
/* we have msg->next which points to next line. Look for CRLF. But
* first, we reset msg->sol */
msg->sol = 0;
while (1) {
const char *p1 = NULL, *p2 = NULL;
const char *start = b_ptr(buf, msg->next + msg->sol);
const char *stop = bi_end(buf);
const char *ptr = start;
int bytes = 0;
/* scan current line and stop at LF or CRLF */
while (1) {
if (ptr == stop)
return 0;
if (*ptr == '\n') {
if (!p1)
p1 = ptr;
p2 = ptr;
break;
}
if (*ptr == '\r') {
if (p1) {
msg->err_pos = buffer_count(buf, buf->p, ptr);
return -1;
}
p1 = ptr;
}
ptr++;
if (ptr >= buf->data + buf->size)
ptr = buf->data;
}
/* after LF; point to beginning of next line */
p2++;
if (p2 >= buf->data + buf->size)
p2 = buf->data;
bytes = p2 - start;
if (bytes < 0)
bytes += buf->size;
msg->sol += bytes;
/* LF/CRLF at beginning of line => end of trailers at p2.
* Everything was scheduled for forwarding, there's nothing left
* from this message. */
if (p1 == start)
return 1;
/* OK, next line then */
}
}