Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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File size:
804 bytes
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Rev | Line | |
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[398] | 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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