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https://github.com/jart/cosmopolitan.git
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775944a2d0
This change upgrades to the latest Chromium Zlib, fixes bugs in redbean, and introduces better support for reverse proxies like Cloudflare. This change improves the security of redbean and it's recommended that users upgrade to the release that'll follow. This change also updates the docs to clarify how to use the security tools redbean provides e.g. pledge(), unveil(), and the MODE=asan builds which improve memory safety.
91 lines
3.3 KiB
C
91 lines
3.3 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 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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#include "net/http/http.h"
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/**
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* Parses X-Forwarded-For.
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*
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* This header is used by reverse proxies. For example:
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*
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* X-Forwarded-For: 203.0.110.2, 203.0.113.42:31337
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*
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* The port is optional and will be set to zero if absent.
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*
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* @param s is input data
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* @param n if -1 implies strlen
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* @param ip receives last/right ip on success if not NULL
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* @param port receives port on success if not NULL
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* @return 0 on success or -1 on failure
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* @see RFC7239's poorly designed Forwarded header
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*/
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int ParseForwarded(const char *s, size_t n, uint32_t *ip, uint16_t *port) {
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int c, t;
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size_t i;
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char *r;
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uint32_t x;
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if (n == -1) n = s ? strlen(s) : 0;
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if (n) {
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t = x = i = 0;
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if ((r = memrchr(s, ',', n))) {
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i = r - s;
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if ((s[++i] & 255) == ' ') ++i; // skip optional space
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}
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do {
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c = s[i++] & 255;
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if (isdigit(c)) {
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t *= 10;
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t += c - '0';
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if (t > 255) {
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return -1;
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}
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} else if (c == '.') {
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x <<= 8;
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x |= t;
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t = 0;
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} else if (c == ':') {
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break;
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} else {
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return -1;
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}
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} while (i < n);
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x <<= 8;
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x |= t;
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t = 0;
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if (c == ':') {
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while (i < n) {
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c = s[i++] & 255;
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if (isdigit(c)) {
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t *= 10;
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t += c - '0';
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if (t > 65535) {
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return -1;
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}
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} else {
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return -1;
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}
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}
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}
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if (ip) *ip = x;
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if (port) *port = t;
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return 0;
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} else {
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return -1;
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}
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}
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