123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/alg/arraylist.h"
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#include "libc/limits.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/x/x.h"
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#include "net/http/http.h"
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enum ParseHttpRequestState {
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METHOD,
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URI,
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VERSION,
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HKEY,
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HSEP,
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HVAL,
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CR1,
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LF1,
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LF2
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};
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/**
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* Parses HTTP request header.
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*/
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int ParseHttpRequest(struct HttpRequest *req, const char *p, size_t n) {
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int a, h, c, i, x;
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enum ParseHttpRequestState t;
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memset(req, 0, sizeof(*req));
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a = h = 0;
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t = METHOD;
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if (n > SHRT_MAX - 1) n = SHRT_MAX - 1;
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for (i = 0; i < n; ++i) {
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c = p[i] & 0xFF;
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switch (t) {
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case METHOD:
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if (c == '\r' || c == '\n') break; /* RFC7230 § 3.5 */
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if (c == ' ') {
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if (!i) return ebadmsg();
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if ((x = GetHttpMethod(p, i)) == -1) return ebadmsg();
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req->method = x;
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req->uri.a = i + 1;
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t = URI;
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}
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break;
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case URI:
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if (c == ' ') {
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req->uri.b = i;
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req->version.a = i + 1;
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if (req->uri.a == req->uri.b) return ebadmsg();
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t = VERSION;
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}
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break;
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case VERSION:
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if (c == '\r' || c == '\n') {
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req->version.b = i;
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t = c == '\r' ? CR1 : LF1;
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}
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break;
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case CR1:
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if (c != '\n') return ebadmsg();
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t = LF1;
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break;
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case LF1:
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if (c == '\r') {
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t = LF2;
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break;
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} else if (c == '\n') {
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return 0;
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} else if (c == ' ' || c == '\t') { /* line folding!!! */
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return eprotonosupport(); /* RFC7230 § 3.2.4 */
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}
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a = i;
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t = HKEY;
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/* εpsilon transition */
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case HKEY:
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if (c == ':') {
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h = GetHttpHeader(p + a, i - a);
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t = HSEP;
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}
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break;
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case HSEP:
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if (c == ' ' || c == '\t') break;
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a = i;
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t = HVAL;
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/* εpsilon transition */
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case HVAL:
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if (c == '\r' || c == '\n') {
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if (h != -1) {
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req->headers[h].a = a;
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req->headers[h].b = i;
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}
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t = c == '\r' ? CR1 : LF1;
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}
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break;
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case LF2:
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if (c == '\n') return 0;
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return ebadmsg();
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default:
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unreachable;
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}
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}
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return ebadmsg();
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}
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