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https://github.com/jart/cosmopolitan.git
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a68cc690ff
This change also fixes a bug so that DNS lookups work correctly when the first answer is a CNAME record.
54 lines
2.9 KiB
C
54 lines
2.9 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/assert.h"
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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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* Returns true if standard header has substring.
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*
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* @param m is message parsed by ParseHttpMessage
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* @param b is buffer that ParseHttpMessage parsed
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* @param h is known header, e.g. kHttpAcceptEncoding
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* @param s should not contain comma
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* @param n is byte length of s where -1 implies strlen
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* @return true if substring present
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*/
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bool HeaderHas(struct HttpMessage *m, const char *b, int h, const char *s,
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size_t n) {
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size_t i;
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assert(0 <= h && h < kHttpHeadersMax);
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if (n == -1) n = s ? strlen(s) : 0;
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if (m->headers[h].a) {
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if (memmem(b + m->headers[h].a, m->headers[h].b - m->headers[h].a, s, n)) {
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return true;
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}
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if (kHttpRepeatable[h]) {
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for (i = 0; i < m->xheaders.n; ++i) {
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if (GetHttpHeader(b + m->xheaders.p[i].k.a,
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m->xheaders.p[i].k.b - m->xheaders.p[i].k.a) == h &&
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memmem(b + m->xheaders.p[i].v.a,
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m->xheaders.p[i].v.b - m->xheaders.p[i].v.a, s, n)) {
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return true;
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}
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}
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}
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}
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return false;
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}
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