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43fe5956ad
Now that our socket system call polyfills are good enough to support Musl's DNS library we should be using that rather than the barebones domain name system implementation we rolled on our own. There's many benefits to making this change. So many, that I myself wouldn't feel qualified to enumerate them all. The Musl DNS code had to be changed in order to support Windows of course, which looks very solid so far
62 lines
3.3 KiB
C
62 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/musl/lookup.internal.h"
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int __dns_parse(const unsigned char *r, int rlen,
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int callback(void *, int, const void *, int, const void *, int),
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void *ctx)
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{
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int qdcount, ancount;
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const unsigned char *p;
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int len;
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if (rlen<12) return -1;
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if ((r[3]&15)) return 0;
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p = r+12;
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qdcount = r[4]*256 + r[5];
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ancount = r[6]*256 + r[7];
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if (qdcount+ancount > 64) return -1;
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while (qdcount--) {
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while (p-r < rlen && *p-1U < 127) p++;
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if (p>r+rlen-6)
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return -1;
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p += 5 + !!*p;
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}
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while (ancount--) {
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while (p-r < rlen && *p-1U < 127) p++;
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if (p>r+rlen-12)
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return -1;
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p += 1 + !!*p;
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len = p[8]*256 + p[9];
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if (len+10 > r+rlen-p) return -1;
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if (callback(ctx, p[1], p+10, len, r, rlen) < 0) return -1;
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p += 10 + len;
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}
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return 0;
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}
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