51 lines
1.2 KiB
Diff
51 lines
1.2 KiB
Diff
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Index: netcat-openbsd-1.89/netcat.c
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===================================================================
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--- netcat-openbsd-1.89.orig/netcat.c 2008-01-22 16:17:30.000000000 -0500
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+++ netcat-openbsd-1.89/netcat.c 2008-01-22 16:17:34.000000000 -0500
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@@ -69,6 +69,8 @@
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#define CONNECTION_FAILED 1
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#define CONNECTION_TIMEOUT 2
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+#define UDP_SCAN_TIMEOUT 3 /* Seconds */
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+
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/* Command Line Options */
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int dflag; /* detached, no stdin */
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int iflag; /* Interval Flag */
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@@ -376,7 +378,7 @@
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continue;
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ret = 0;
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- if (vflag) {
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+ if (vflag && !uflag) {
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/* For UDP, make sure we are connected. */
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if (uflag) {
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if (udptest(s) == -1) {
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@@ -841,15 +843,20 @@
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int
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udptest(int s)
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{
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- int i, ret;
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+ int i, t;
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- for (i = 0; i <= 3; i++) {
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- if (write(s, "X", 1) == 1)
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- ret = 1;
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- else
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- ret = -1;
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+ if ((write(s, "X", 1) != 1) ||
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+ ((write(s, "X", 1) != 1) && (errno == ECONNREFUSED)))
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+ return -1;
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+
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+ /* Give the remote host some time to reply. */
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+ for (i = 0, t = (timeout == -1) ? UDP_SCAN_TIMEOUT : (timeout / 1000);
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+ i < t; i++) {
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+ sleep(1);
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+ if ((write(s, "X", 1) != 1) && (errno == ECONNREFUSED))
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+ return -1;
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}
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- return (ret);
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+ return 1;
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}
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void
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