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Unified Diff: fusl/src/network/res_mkquery.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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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);
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