Index: fusl/src/network/dns_parse.c |
diff --git a/fusl/src/network/dns_parse.c b/fusl/src/network/dns_parse.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..0c7a60112473974601e86ac8fb0712dcb5fe3083 |
--- /dev/null |
+++ b/fusl/src/network/dns_parse.c |
@@ -0,0 +1,32 @@ |
+#include <string.h> |
+ |
+int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, const void *, int, const void *), void *ctx) |
+{ |
+ int qdcount, ancount; |
+ const unsigned char *p; |
+ int len; |
+ |
+ if (rlen<12) return -1; |
+ if ((r[3]&15)) return 0; |
+ p = r+12; |
+ qdcount = r[4]*256 + r[5]; |
+ ancount = r[6]*256 + r[7]; |
+ if (qdcount+ancount > 64) return -1; |
+ while (qdcount--) { |
+ while (p-r < rlen && *p-1U < 127) p++; |
+ if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6) |
+ return -1; |
+ p += 5 + !!*p; |
+ } |
+ while (ancount--) { |
+ while (p-r < rlen && *p-1U < 127) p++; |
+ if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6) |
+ return -1; |
+ p += 1 + !!*p; |
+ len = p[8]*256 + p[9]; |
+ if (p+len > r+rlen) return -1; |
+ if (callback(ctx, p[1], p+10, len, r) < 0) return -1; |
+ p += 10 + len; |
+ } |
+ return 0; |
+} |