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/**
* Copyright (c) 2005 Zed A. Shaw
* You can redistribute it and/or modify it under the same terms as Ruby.
*/
#include <http_request_parser.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#define LEN(AT, FPC) (FPC - buffer - parser->AT)
#define MARK(M,FPC) (parser->M = (FPC) - buffer)
#define PTR_TO(F) (buffer + parser->F)
/** Machine **/
%%{
machine http_request_parser;
action mark {MARK(mark, fpc); }
action start_field { MARK(field_start, fpc); }
action write_field {
parser->field_len = LEN(field_start, fpc);
}
action start_value { MARK(mark, fpc); }
action write_value {
if(parser->http_field != NULL) {
parser->http_field(parser->data, PTR_TO(field_start), parser->field_len, PTR_TO(mark), LEN(mark, fpc));
}
}
action request_method {
if(parser->request_method != NULL)
parser->request_method(parser->data, PTR_TO(mark), LEN(mark, fpc));
}
action request_uri {
if(parser->request_uri != NULL)
parser->request_uri(parser->data, PTR_TO(mark), LEN(mark, fpc));
}
action fragment {
if(parser->fragment != NULL)
parser->fragment(parser->data, PTR_TO(mark), LEN(mark, fpc));
}
action start_query {MARK(query_start, fpc); }
action query_string {
if(parser->query_string != NULL)
parser->query_string(parser->data, PTR_TO(query_start), LEN(query_start, fpc));
}
action http_version {
if(parser->http_version != NULL)
parser->http_version(parser->data, PTR_TO(mark), LEN(mark, fpc));
}
action request_path {
if(parser->request_path != NULL)
parser->request_path(parser->data, PTR_TO(mark), LEN(mark,fpc));
}
action done {
parser->body_start = fpc - buffer + 1;
if(parser->header_done != NULL)
parser->header_done(parser->data, fpc + 1, pe - fpc - 1);
fbreak;
}
#### HTTP PROTOCOL GRAMMAR
# line endings
CRLF = "\r\n";
# character types
CTL = (cntrl | 127);
safe = ("$" | "-" | "_" | ".");
extra = ("!" | "*" | "'" | "(" | ")" | ",");
reserved = (";" | "/" | "?" | ":" | "@" | "&" | "=" | "+");
unsafe = (CTL | " " | "\"" | "#" | "%" | "<" | ">");
national = any -- (alpha | digit | reserved | extra | safe | unsafe);
unreserved = (alpha | digit | safe | extra | national);
escape = ("%" xdigit xdigit);
uchar = (unreserved | escape);
pchar = (uchar | ":" | "@" | "&" | "=" | "+");
tspecials = ("(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\\" | "\"" | "/" | "[" | "]" | "?" | "=" | "{" | "}" | " " | "\t");
# elements
token = (ascii -- (CTL | tspecials));
# URI schemes and absolute paths
scheme = ( alpha | digit | "+" | "-" | "." )* ;
absolute_uri = (scheme ":" (uchar | reserved )*);
path = ( pchar+ ( "/" pchar* )* ) ;
query = ( uchar | reserved )* %query_string ;
param = ( pchar | "/" )* ;
params = ( param ( ";" param )* ) ;
rel_path = ( path? %request_path (";" params)? ) ("?" %start_query query)?;
absolute_path = ( "/"+ rel_path );
Request_URI = ( "*" | absolute_uri | absolute_path ) >mark %request_uri;
Fragment = ( uchar | reserved )* >mark %fragment;
Method = ( upper | digit | safe ){1,20} >mark %request_method;
http_number = ( digit+ "." digit+ ) ;
HTTP_Version = ( "HTTP/" http_number ) >mark %http_version ;
Request_Line = ( Method " " Request_URI ("#" Fragment){0,1} " " HTTP_Version CRLF ) ;
#field_name = ( token -- ":" )+ >start_field $snake_upcase_field %write_field;
field_name = ( token -- ":" )+ >start_field %write_field;
field_value = any* >start_value %write_value;
message_header = field_name ":" " "* field_value :> CRLF;
Request = Request_Line ( message_header )* ( CRLF @done );
main := Request;
}%%
/** Data **/
%% write data;
int http_request_parser_init(http_request_parser *parser) {
int cs = 0;
%% write init;
parser->cs = cs;
parser->body_start = 0;
parser->content_len = 0;
parser->mark = 0;
parser->nread = 0;
parser->field_len = 0;
parser->field_start = 0;
return(1);
}
/** exec **/
size_t http_request_parser_execute(http_request_parser *parser, const signed char *buffer, size_t len, size_t off) {
const signed char *p, *pe;
int cs = parser->cs;
assert(off <= len && "offset past end of buffer");
p = buffer + off;
pe = buffer + len;
%% write exec;
if (!http_request_parser_has_error(parser))
parser->cs = cs;
parser->nread += p - (buffer + off);
assert(p <= pe && "buffer overflow after parsing execute");
assert(parser->nread <= len && "nread longer than length");
assert(parser->body_start <= len && "body starts after buffer end");
assert(parser->mark < len && "mark is after buffer end");
assert(parser->field_len <= len && "field has length longer than whole buffer");
assert(parser->field_start < len && "field starts after buffer end");
return(parser->nread);
}
int http_request_parser_finish(http_request_parser *parser)
{
if (http_request_parser_has_error(parser) ) {
return -1;
} else if (http_request_parser_is_finished(parser) ) {
return 1;
} else {
return 0;
}
}
int http_request_parser_has_error(http_request_parser *parser) {
return parser->cs == http_request_parser_error;
}
int http_request_parser_is_finished(http_request_parser *parser) {
return parser->cs >= http_request_parser_first_final;
}
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