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6992d8c195
The name resolution would abort when getting more than 63 records per request, due to what seems to be a left-over from the original code. This check was non-breaking but spurious prior to TCP fallback support, since any 512-byte packet with more than 63 records was necessarily malformed. But now, it wrongly rejects valid results. Reported by Daniel Stefanik in Alpine Linux aports issue 15320.
60 lines
3.3 KiB
C
60 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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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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