Author: rpaulo
Date: Wed Jul 31 02:13:18 2013
New Revision: 253827
URL: http://svnweb.freebsd.org/changeset/base/253827
Log:
When using tcpdump -I -i wlanN and wlanN is not a monitor mode VAP,
tcpdump will print an error message saying rfmon is not supported.
Give a concise explanation as to how one might solve this problem by
creating a monitor mode VAP.
Modified:
head/contrib/tcpdump/tcpdump.c
Modified: head/contrib/tcpdump/tcpdump.c
==============================================================================
--- head/contrib/tcpdump/tcpdump.c Wed Jul 31 01:42:59 2013
(r253826)
+++ head/contrib/tcpdump/tcpdump.c Wed Jul 31 02:13:18 2013
(r253827)
@@ -71,6 +71,8 @@ extern int SIZE_BUF;
#ifdef __FreeBSD__
#include <sys/capability.h>
#include <sys/ioccom.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
#include <net/bpf.h>
#include <fcntl.h>
#include <libgen.h>
@@ -1307,6 +1309,27 @@ main(int argc, char **argv)
*cp != '\0')
error("%s: %s\n(%s)", device,
pcap_statustostr(status), cp);
+#ifdef __FreeBSD__
+ else if (status == PCAP_ERROR_RFMON_NOTSUP &&
+ strncmp(device, "wlan", 4) == 0) {
+ char parent[8], newdev[8];
+ char sysctl[32];
+ size_t s = sizeof(parent);
+
+ snprintf(sysctl, sizeof(sysctl),
+ "net.wlan.%d.%%parent", atoi(device + 4));
+ sysctlbyname(sysctl, parent, &s, NULL, 0);
+ strlcpy(newdev, device, sizeof(newdev));
+ /* Suggest a new wlan device. */
+ newdev[strlen(newdev)-1]++;
+ error("%s is not a monitor mode VAP\n"
+ "To create a new monitor mode VAP use:\n"
+ " ifconfig %s create wlandev %s wlanmode "
+ "monitor\nand use %s as the tcpdump "
+ "interface", device, newdev, parent,
+ newdev);
+ }
+#endif
else
error("%s: %s", device,
pcap_statustostr(status));
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