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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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net/http/parsehttprequest.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ 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; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/alg.h"
#include "libc/alg/arraylist.h"
#include "libc/limits.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
#include "libc/x/x.h"
#include "net/http/http.h"
enum ParseHttpRequestState {
METHOD,
URI,
VERSION,
HKEY,
HSEP,
HVAL,
CR1,
LF1,
LF2
};
/**
* Parses req line and headers of HTTP req.
*
* This parser is very lax. All decoding is ISO-8859-1. A 1mB upper
* bound on memory is enforced.
*/
int parsehttprequest(struct HttpRequest *req, FILE *f) {
enum ParseHttpRequestState state = METHOD;
int toto = 0;
clearhttprequest(req);
while (true) {
char ch;
{
int c = fgetc(f);
if (c == -1) {
if (toto && !ferror(f)) {
return ebadmsg(); /* RFC7230 § 3.4 */
}
return -1;
}
ch = (unsigned char)c;
}
if (++toto == UINT16_MAX) {
return ebadmsg(); /* RFC7230 § 3.2.5 */
}
switch (state) {
case METHOD:
if (ch == '\r' || ch == '\n') break; /* RFC7230 § 3.5 */
if (ch == ' ') {
if (req->method.i == 0) return ebadmsg();
state = URI;
} else {
append(&req->method, &ch);
}
break;
case URI:
if (ch == ' ') {
if (req->uri.i == 0) return ebadmsg();
state = VERSION;
} else {
append(&req->uri, &ch);
}
break;
case VERSION:
if (ch == '\r' || ch == '\n') {
state = ch == '\r' ? CR1 : LF1;
} else {
append(&req->version, &ch);
}
break;
case CR1:
if (ch != '\n') return ebadmsg();
state = LF1;
break;
case LF1:
if (ch == '\r') {
state = LF2;
break;
} else if (ch == '\n') {
return 0;
} else if (ch == ' ' || ch == '\t') { /* line folding!!! */
return eprotonosupport(); /* RFC7230 § 3.2.4 */
}
state = HKEY;
/* εpsilon transition */
case HKEY:
if (ch == ':') state = HSEP;
ch = tolower(ch);
append(&req->scratch, &ch);
break;
case HSEP:
if (ch == ' ' || ch == '\t') break;
state = HVAL;
/* εpsilon transition */
case HVAL:
if (ch == '\r' || ch == '\n') {
state = ch == '\r' ? CR1 : LF1;
ch = '\0';
}
append(&req->scratch, &ch);
if (!ch) {
critbit0_insert(&req->headers, req->scratch.p);
req->scratch.i = 0;
}
break;
case LF2:
if (ch == '\n') return 0;
return ebadmsg();
default:
unreachable;
}
}
}