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-rw-r--r--src/network/res_send.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/network/res_send.c b/src/network/res_send.c
index b9cea0bf..9593164d 100644
--- a/src/network/res_send.c
+++ b/src/network/res_send.c
@@ -1,9 +1,17 @@
#include <resolv.h>
+#include <string.h>
int __res_send(const unsigned char *msg, int msglen, unsigned char *answer, int anslen)
{
- int r = __res_msend(1, &msg, &msglen, &answer, &anslen, anslen);
- return r<0 ? r : anslen;
+ int r;
+ if (anslen < 512) {
+ unsigned char buf[512];
+ r = __res_send(msg, msglen, buf, sizeof buf);
+ if (r >= 0) memcpy(answer, buf, r < anslen ? r : anslen);
+ return r;
+ }
+ r = __res_msend(1, &msg, &msglen, &answer, &anslen, anslen);
+ return r<0 || !anslen ? -1 : anslen;
}
weak_alias(__res_send, res_send);