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.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=253827
@ -71,6 +71,8 @@ extern int SIZE_BUF;
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#ifdef __FreeBSD__
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#include <sys/capability.h>
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#include <sys/ioccom.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <net/bpf.h>
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#include <fcntl.h>
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#include <libgen.h>
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@ -1307,6 +1309,27 @@ main(int argc, char **argv)
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*cp != '\0')
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error("%s: %s\n(%s)", device,
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pcap_statustostr(status), cp);
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#ifdef __FreeBSD__
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else if (status == PCAP_ERROR_RFMON_NOTSUP &&
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strncmp(device, "wlan", 4) == 0) {
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char parent[8], newdev[8];
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char sysctl[32];
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size_t s = sizeof(parent);
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snprintf(sysctl, sizeof(sysctl),
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"net.wlan.%d.%%parent", atoi(device + 4));
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sysctlbyname(sysctl, parent, &s, NULL, 0);
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strlcpy(newdev, device, sizeof(newdev));
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/* Suggest a new wlan device. */
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newdev[strlen(newdev)-1]++;
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error("%s is not a monitor mode VAP\n"
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"To create a new monitor mode VAP use:\n"
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" ifconfig %s create wlandev %s wlanmode "
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"monitor\nand use %s as the tcpdump "
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"interface", device, newdev, parent,
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newdev);
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}
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#endif
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else
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error("%s: %s", device,
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pcap_statustostr(status));
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