Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
804 bytes
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Line | |
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1 | #include <string.h>
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2 |
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3 | int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, const void *, int, const void *), void *ctx)
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4 | {
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5 | int qdcount, ancount;
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6 | const unsigned char *p;
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7 | int len;
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8 |
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9 | if (rlen<12) return -1;
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10 | if ((r[3]&15)) return 0;
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11 | p = r+12;
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12 | qdcount = r[4]*256 + r[5];
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13 | ancount = r[6]*256 + r[7];
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14 | if (qdcount+ancount > 64) return -1;
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15 | while (qdcount--) {
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16 | while (p-r < rlen && *p-1U < 127) p++;
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17 | if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
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18 | return -1;
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19 | p += 5 + !!*p;
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20 | }
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21 | while (ancount--) {
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22 | while (p-r < rlen && *p-1U < 127) p++;
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23 | if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
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24 | return -1;
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25 | p += 1 + !!*p;
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26 | len = p[8]*256 + p[9];
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27 | if (p+len > r+rlen) return -1;
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28 | if (callback(ctx, p[1], p+10, len, r) < 0) return -1;
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29 | p += 10 + len;
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30 | }
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31 | return 0;
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32 | }
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