1 files changed, 100 insertions, 0 deletions
diff --git a/src/wireless b/src/wireless
new file mode 100644
index 0000000..f45028e
--- /dev/null
+++ b/src/wireless
@@ -0,0 +1,100 @@
+# Uses wireless_tools, to check for association to a network.
+# wep_check interface [timeout]
+wep_check()
+{
+    local INTERFACE=$1 TIMEOUT=${2:-15} timeout=0 bssid
+
+    while [[ $timeout -ne $TIMEOUT ]]; do
+        bssid=`iwgetid $INTERFACE -ra`
+        [[ ! "$bssid" = "00:00:00:00:00:00" ]] && return 0
+        sleep 1
+        let timeout++
+    done
+    return 1
+}
+
+# Check if a particular network is within range
+# find_essid interface essid
+find_essid() {
+    local INTERFACE="$1" ESSID="$2" RETRIES=20 try=0 res scanned
+    while [[ "$try" -lt "$RETRIES" ]]; do
+        sleep 0.5
+        let try++
+        found=$(
+            res=$(iwlist "$INTERFACE" scan 2>/dev/null)
+            [[ -z "$res" ]] && exit 1
+            # if results were non-null, process them and exit 0
+            echo "$res" | sed -nr 's/^\s+ESSID:"([^"]*)"$/\1/p' | fgrep -xm1 "$ESSID"
+           ) && { 
+                scanned=1
+                report_debug find_essid "\"$found\""
+                # we only bother with at most 5 successful scans
+                if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
+              }
+        if [[ -n "$found" ]]; then
+            return 0 # network found
+        fi
+    done
+    if [[ "$scanned" -ne 1 ]]; then
+        report_debug find_essid "unable to scan"
+    fi
+    return 1
+}
+
+# Check if a particular network is within range
+# find_ap interface ap
+find_ap() {
+    local INTERFACE="$1" ap=$(echo "$2" | tr 'abcdef' 'ABCDEF') RETRIES=20 try=0 res scanned
+    while [[ "$try" -lt "$RETRIES" ]]; do
+        sleep 0.5
+        let try++
+        found=$(
+            res=$(iwlist "$INTERFACE" scan 2> /dev/null)
+            [[ -z "$res" ]] && exit 1
+            # if results were non-null, process them and exit 0
+            echo "$res" | sed -nr '/^\s+Cell .. - Address: ([[:xdigit:]:]+)$/ { s//\1/; N; s/(.*)\n\s+ESSID:"([^"]*)"$/\1\t\2/p }' \
+            | egrep -m1 "^$ap\t"
+            ) && {
+                    scanned=1
+                    report_debug find_ap "\"$found\""
+                    # we only bother with at most 5 successful scans
+                    if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
+                 }
+        if [[ -n "$found" ]]; then
+            echo "$found" | cut -f2     # JP: echo literal ESSID
+            return 0
+        fi
+    done
+    if [[ "$scanned" -ne 1 ]]; then
+        report_debug find_ap "unable to scan"
+    fi
+    return 1
+}
+
+# Return a filename containing a list of network ESSID's found.
+# list_networks interface
+list_networks()
+{
+    # temp file used, as keeping ESSID's with spaces in their name in arrays 
+    # is hard, obscure and kinda nasty. This is simpler and clearer.
+ 
+    [[ -z "$1" ]] && return 1
+    essids=$(mktemp /tmp/essid.XXXXX)
+
+    let try=0;
+    RETRIES=6;
+    while [[ $try -ne $RETRIES ]]; do        
+        iwlist $1 scan 2> /dev/null|grep ESSID|sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
+        sleep 0.5; let try++
+    done
+    sort -u $essids -o $essids
+  
+    # File of 0 length, ie. no ssid's.
+    if [[ ! -s $essids ]]; then
+        return 1
+    fi
+
+    echo $essids
+    return 0
+}
+# vim: set ts=4 et sw=4 ft=sh: