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| | /*
* Copyright (C) 2012-2013, Eric Wong <normalperson@yhbt.net>
* License: GPLv3 or later (see COPYING for details)
*/
#include "cmogstored.h"
#include "http_util.h"
static bool length_incr(off_t *len, unsigned c)
{
off_t prev = *len;
*len *= 10;
*len += c - '0';
if (*len >= prev)
return true;
errno = ERANGE;
*len = -1;
return false;
}
%%{
machine http_parser;
include http_common "http_common.rl";
include path_parser "path_parser.rl";
ignored_header := header_name ':' sep header_value eor @ {
fgoto more_headers;
};
GET = "GET "> { http->_p.http_method = MOG_HTTP_METHOD_GET; };
HEAD = "HEAD "> { http->_p.http_method = MOG_HTTP_METHOD_HEAD; };
PUT = "PUT "> { http->_p.http_method = MOG_HTTP_METHOD_PUT; };
DELETE = "DELETE "> { http->_p.http_method = MOG_HTTP_METHOD_DELETE; };
MKCOL = "MKCOL "> { http->_p.http_method = MOG_HTTP_METHOD_MKCOL; };
# no HTTP/0.9 for now, sorry (not :P)
req_line = (HEAD|GET|PUT|DELETE|MKCOL)
("http://" [^/]+)?
'/'*(mog_path) > { http->_p.path_tip = to_u8(fpc - buf); }
# TODO: maybe folks use query string/fragments for logging...
(" HTTP/1.") > { http->_p.path_end = to_u8(fpc - buf); }
('0'|'1'> { http->_p.persistent = 1; }) '\r'LF;
content_length = "Content-Length:"i sep
(digit+) $ {
if (!length_incr(&http->_p.content_len, fc))
fbreak;
}
$! { errno = EINVAL; fbreak; }
eor;
content_range = "Content-Range:"i sep "bytes"LWS+
(digit+) $ {
if (!length_incr(&http->_p.range_beg, fc))
fbreak;
}
$! { errno = EINVAL; fbreak; }
"-"
(digit+) $ {
if (!length_incr(&http->_p.range_end, fc))
fbreak;
}
$! { errno = EINVAL; fbreak; }
"/*"
eor > { http->_p.has_content_range = 1; };
range = "Range:"i sep (
"bytes=" > {
http->_p.range_beg = http->_p.range_end = -1;
}
(digit*) $ {
if (http->_p.range_beg < 0)
http->_p.range_beg = 0;
if (!length_incr(&http->_p.range_beg, fc))
fbreak;
}
'-'
(digit*) $ {
if (http->_p.range_end < 0)
http->_p.range_end = 0;
if (!length_incr(&http->_p.range_end, fc))
fbreak;
}
) $! { errno = EINVAL; fbreak; }
eor @ { http->_p.has_range = 1; };
transfer_encoding_chunked = "Transfer-Encoding:"i sep
"chunked"i eor > { http->_p.chunked = 1; };
trailer = "Trailer:"i sep
(("Content-MD5"i @ { http->_p.has_md5 = 1; })
| header_name | ',')
eor;
connection = "Connection:"i sep
(("close"i @ { http->_p.persistent = 0; }) |
("keep-alive"i @ { http->_p.persistent = 1; })) eor;
header_line =
( content_length |
transfer_encoding_chunked |
trailer |
range |
content_range |
content_md5 |
connection ) $!
{
assert(http->_p.line_end > 0 &&
"no previous request/header line");
assert(buf[http->_p.line_end] == '\n' &&
"bad http->_p.line_end");
p = buf + http->_p.line_end + 1;
assert(p <= pe && "overflow");
fgoto ignored_header;
};
headers = header_line* '\r''\n' > { really_done = 1; fbreak; };
more_headers := headers;
main := req_line headers;
}%%
%% write data;
void mog_http_reset_parser(struct mog_http *http)
{
int cs;
%% write init;
http->cs = cs;
memset(&http->_p, 0, sizeof(http->_p));
if (http->rbuf) /* already pipelined */
http->_p.persist_client_at_start = 1;
else
/*
* we need to know persist_client when we start reading
* the request because we do not want to break pipelined
* requests
*/
http->_p.persist_client_at_start = http->svc->persist_client;
/* these should probably be in mog_http_init */
http->forward = NULL;
http->wbuf = NULL;
}
void mog_http_init(struct mog_http *http, struct mog_svc *svc)
{
http->svc = svc;
http->rbuf = NULL;
mog_http_reset_parser(http);
}
enum mog_parser_state
mog_http_parse(struct mog_http *http, char *buf, size_t len)
{
char *p, *pe, *eof = NULL;
int cs = http->cs;
int really_done = 0;
size_t off = http->_p.buf_off;
uint32_t *mog_devid = &http->_p.mog_devid;
assert(http->wbuf == NULL && "unwritten data in buffer");
assert(off <= len && "http offset past end of buffer");
p = buf + off;
pe = buf + len;
assert((void *)(pe - p) == (void *)(len - off) &&
"pointers aren't same distance");
errno = 0;
%% write exec;
if (really_done)
cs = http_parser_first_final;
http->cs = cs;
http->_p.buf_off = p - buf;
if (cs == http_parser_error || errno)
return MOG_PARSER_ERROR;
assert(p <= pe && "buffer overflow after http parse");
assert(http->_p.buf_off <= len && "offset longer than len");
if (http->cs == http_parser_first_final) {
http->_p.persistent &= http->_p.persist_client_at_start;
return MOG_PARSER_DONE;
}
return MOG_PARSER_CONTINUE;
}
|