Index: fusl/src/network/res_mkquery.c |
diff --git a/fusl/src/network/res_mkquery.c b/fusl/src/network/res_mkquery.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ec4568acb8166cbe7d6624ee6357cdd731e1c514 |
--- /dev/null |
+++ b/fusl/src/network/res_mkquery.c |
@@ -0,0 +1,44 @@ |
+#include <resolv.h> |
+#include <string.h> |
+#include <time.h> |
+#include "libc.h" |
+ |
+int __res_mkquery(int op, const char *dname, int class, int type, |
+ const unsigned char *data, int datalen, |
+ const unsigned char *newrr, unsigned char *buf, int buflen) |
+{ |
+ int id, i, j; |
+ unsigned char q[280]; |
+ struct timespec ts; |
+ size_t l = strnlen(dname, 255); |
+ int n; |
+ |
+ if (l && dname[l-1]=='.') l--; |
+ n = 17+l+!!l; |
+ if (l>253 || buflen<n || op>15u || class>255u || type>255u) |
+ return -1; |
+ |
+ /* Construct query template - ID will be filled later */ |
+ memset(q, 0, n); |
+ q[2] = op*8 + 1; |
+ q[5] = 1; |
+ memcpy((char *)q+13, dname, l); |
+ for (i=13; q[i]; i=j+1) { |
+ for (j=i; q[j] && q[j] != '.'; j++); |
+ if (j-i-1u > 62u) return -1; |
+ q[i-1] = j-i; |
+ } |
+ q[i+1] = type; |
+ q[i+3] = class; |
+ |
+ /* Make a reasonably unpredictable id */ |
+ clock_gettime(CLOCK_REALTIME, &ts); |
+ id = ts.tv_nsec + ts.tv_nsec/65536UL & 0xffff; |
+ q[0] = id/256; |
+ q[1] = id; |
+ |
+ memcpy(buf, q, n); |
+ return n; |
+} |
+ |
+weak_alias(__res_mkquery, res_mkquery); |