3 int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, const void *, int, const void *), void *ctx)
6 const unsigned char *p;
9 if (rlen<12) return -1;
10 if ((r[3]&15)) return 0;
12 qdcount = r[4]*256 + r[5];
13 ancount = r[6]*256 + r[7];
14 if (qdcount+ancount > 64) return -1;
16 while (p-r < rlen && *p-1U < 127) p++;
17 if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
22 while (p-r < rlen && *p-1U < 127) p++;
23 if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6)
26 len = p[8]*256 + p[9];
27 if (p+len > r+rlen) return -1;
28 if (callback(ctx, p[1], p+10, len, r) < 0) return -1;