dd-wrt wl site_survey

This is for the users of DD-WRT in this group.

In the latest (07/13/2007) release of v23 SP3 of DD-WRT, Brainslayer
has removed a huge number of wl command options including some that
I've used in previous examples and utilities. At this time, the
workaround is not documented in the Wiki.

In the past, I did a site survey with:
wl ap 0 (Turn off access point)
wl scan (scan for access points)
(wait about 10 seconds)
wl scanresults (display results)
wl ap 1 (turn on access point)

That no longer works. The scan and scanresults commands have been
vaporized to gain much needed RAM. Fortunately, the script
"site_survey" does the same thing with much neater output.
Here's my results for my home router:

# site_survey
buflen=[792] version=[107] count=[6]
| [ 0] SSID[ moo] BSSID[00:13:10:EA:0B:97] channel[ 6] rssi[-89] noise[-94] beacon[100] cap[401] dtim[0] rate[12] enc[Open]
| [ 1] SSID[ linksys] BSSID[00:0F:66:E2:F7:09] channel[ 6] rssi[-88] noise[-99] beacon[100] cap[1] dtim[0] rate[12] enc[Open]
| [ 2] SSID[ 2WIRE934] BSSID[00:12:88:D9:84:B9] channel[ 6] rssi[-81] noise[-99] beacon[100] cap[431] dtim[0] rate[12] enc[WEP]
| [ 3] SSID[ 2WIRE549] BSSID[00:0D:72:D3:9B:D1] channel[ 6] rssi[-78] noise[-94] beacon[100] cap[471] dtim[0] rate[13] enc[WEP]
| [ 4] SSID[ 2WIRE073] BSSID[00:14:95:08:42:41] channel[ 6] rssi[-86] noise[-99] beacon[100] cap[431] dtim[0] rate[12] enc[WEP]
| [ 5] SSID[ linksys] BSSID[00:13:10:05:48:77] channel[ 6] rssi[-93] noise[-99] beacon[100] cap[401] dtim[0] rate[12] enc[Open]

struct site_survey_list
{
uint8 SSID[32];
unsigned char BSSID[18];
uint8 channel; /* Channel no. */
int16 RSSI; /* receive signal strength (in dBm) */
int16 phy_noise; /* noise (in dBm) */
uint16 beacon_period; /* units are Kusec */
uint16 capability; /* Capability information */
unsigned char ENCINFO[32]; /* encryption info */
uint rate_count; /* # rates in this set */
uint8 dtim_period; /* DTIM period */
} site_survey_lists[SITE_SURVEY_NUM];

The chars use 2 bytes because of word alignment I guess. At the end
the record is padded with zero's, which makes the whole record 100
bytes in size, thus the site_survey log is 5000 bytes exactly.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558