summaryrefslogtreecommitdiffstats
path: root/src/8021x
blob: ce20c36091fca167aabf55efa60a6b9a7edd1a78 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
# Usage: wpa_call $interface $call ...
# Wrapper around wpa_cli to deal with supplicant configurations that set a
# non-standard control path.
wpa_call()
{
    local args=("-i" "$1")
    shift

    if [[ -n "$WPA_CTRL_DIR" ]]; then
        args+=("-p" "$WPA_CTRL_DIR")
    elif [[ -n "$WPA_CONF" ]] && grep -q "^[[:space:]]*ctrl_interface=" "$WPA_CONF"; then
        WPA_CTRL_DIR=$(grep -m 1 "^[[:space:]]*ctrl_interface=" "$WPA_CONF" | cut -d= -f 2-)
        WPA_CTRL_DIR=${WPA_CTRL_DIR#DIR=}
        WPA_CTRL_DIR=${WPA_CTRL_DIR%% GROUP=.*}
        args+=("-p" "$WPA_CTRL_DIR")
    fi
    report_debug wpa_cli "${args[@]}" "$@"
    wpa_cli "${args[@]}" "$@"
}

# Uses wpa_supplicant to check for association to a network
# wpa_check interface [timeout]
wpa_check()
{
    local timeout=0 INTERFACE="$1" TIMEOUT="${2:-15}" CONDITION="${3:-COMPLETED}"
    # CONDITION is required as wired connections are ready at ASSOCIATED not COMPLETED FS#20150

    while (( timeout < TIMEOUT )); do
        ( # Sometimes wpa_supplicant isn't ready so silence errors for 2s only to avoid hiding real errors
        if (( timeout < 2 )); then
            eval $(wpa_call "$INTERFACE" status 2> /dev/null | grep -F "wpa_state=")
        else
            eval $(wpa_call "$INTERFACE" status | grep -F "wpa_state=")
        fi
        [[ "$wpa_state" = "$CONDITION" ]]
        ) && return 0
        sleep 1
        (( ++timeout ))
    done
    echo "$wpa_state"
    # wpa_cli -i "$INTERFACE" terminate >/dev/null 2>&1   # callers sometimes called stop_wpa, which does more but seems redundant
                                                        # termination should either be handled properly here, or by callers
    stop_wpa "$INTERFACE"
    return 1
}

start_wpa()
{
    local INTERFACE="$1" WPA_CONF="$2" WPA_DRIVER="$3"
    shift 3
    local WPA_OPTS="$@"

    if [[ -n "$WPA_CONF" ]]; then
        WPA_CONF="-c$WPA_CONF"
    else
        WPA_CTRL_DIR="/run/wpa_supplicant"
        WPA_CONF="-C$WPA_CTRL_DIR"
    fi

    wpa_supplicant -B -P "/run/wpa_supplicant_${INTERFACE}.pid" -i "$INTERFACE" -D "$WPA_DRIVER" "$WPA_CONF" $WPA_OPTS

    # wait up to one second for the pid file to appear
    timeout_wait 1 '[[ -f "/run/wpa_supplicant_${INTERFACE}.pid" ]]';
    return $?
}

stop_wpa()
{
    # we need this as long as wpa_cli has a different default than netcfg
    [[ -z "$WPA_CTRL_DIR" && -z "$WPA_CONF" ]] && WPA_CTRL_DIR="/run/wpa_supplicant"
    wpa_call "$1" terminate > /dev/null

    # wait up to one second for the pid file to be removed
    timeout_wait 1 '[[ ! -f "/run/wpa_supplicant_$1.pid" ]]' || \
        kill "$(< "/run/wpa_supplicant_$1.pid")" &> /dev/null &
}

wpa_reconfigure() {
    wpa_call "$1" reconfigure > /dev/null
    return $?
}

wpa_check_current_essid() {
    # usage: wpa_check_current_essid $interface $essid
    # check that wpa_supplicant is connected to the right essid
    local INTERFACE=$1 ESSID=$2 status
    status=$(wpa_call "$INTERFACE" status | grep "^ssid=")
    if (( $? == 0 )) && [[ "$status" == "ssid=$ESSID" ]]; then
        return 0
    else
        return 1
    fi
}

wpa_find_essid() {
    # usage: wpa_find_essid $INTERFACE $ESSID
    # look for existence of a given essid. Assumes wpa_supplicant is
    # running
    result=$(wpa_supplicant_scan_and_find "$1" 5 "$2")
    ret=$?
    echo $result
    report_debug wpa_find_essid "\"$result\""
    return $ret
}

wpa_find_ap() {
    # usage: wpa_find_essid $INTERFACE $ESSID
    # look for existence of a given essid. Assumes wpa_supplicant is
    # running
    bssid=${2,,} # set to lowercase
    result=$(wpa_supplicant_scan_and_find "$1" 1 "$bssid")
    ret=$?
    echo $result
    report_debug wpa_find_ap "\"$result\""
    return $ret
}

wpa_supplicant_scan_and_find() {
    #usage: wpa_supplicant_scan_and_find $INTERFACE $FIELD $ITEM
    # field = 1 for bssid, 5 for essid
    # item = string to lookup
    local INTERFACE="$1" FIELD="$2" ITEM="$3" RETRIES=5 try scan_ok
    scan_ok=0
    wpa_call "$INTERFACE" scan > /dev/null
    for ((try=0; try < $RETRIES; try++)); do
        local found
        sleep 2
        found=$(wpa_call "$INTERFACE" scan_results | tail -n+2 | cut -f ${FIELD} | grep -F -x -m 1 "${ITEM}")
        (( $? == 0 )) && scan_ok=1

        # ITEM has been found, echo it
        if [[ -n "$found" ]]; then
            echo "$found"
            return 0
        fi
        wpa_call "$INTERFACE" scan > /dev/null
    done
    if (( $scan_ok != 1 )); then
        report_debug wpa_supplicant_scan_and_find "unable to retrieve scan results"
    fi
    return 1
}

# Return a filename containing a list of network APs and ESSIDs found (sorted by decreasing signal strength)
# list_networks interface
list_networks() {
    wpa_supplicant_scan_info "$1" 1,5
}

wpa_supplicant_scan_info() {
    local INTERFACE="$1" fields="$2" spawned_wpa=0 essids
    # 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 "$INTERFACE" ]] && return 1
    essids=$(mktemp --tmpdir essid.XXXXXXXX)

    if [[ "$(wpa_call "$INTERFACE" ping 2> /dev/null)" != "PONG" ]]; then
        start_wpa "$INTERFACE" "" "${WPA_DRIVER:-nl80211,wext}" || return 1
        spawned_wpa=1
    fi

    wpa_call "$INTERFACE" scan > /dev/null
    # Wait at least 3 seconds for scan results
    sleep 3
    # Sometimes, that is not enough (FS#29946)
    timeout_wait 7 '! wpa_call "$INTERFACE" status | grep -F -q "wpa_state=SCANNING"'
    wpa_call "$INTERFACE" scan_results |
        grep -v "^Selected" |
        grep -v "^bssid" |
        sort -rn -k3 |
        sort -u -k5 |
        sort -rn -k3 |
        cut -f"$fields"  > "$essids"

    # Fields are tab delimited
    # Remove extraneous output from wpa_cli
    # Sort by strength
    # Remove duplicates
    # Re-sort by strength as the removal disorders the list
    # Cut to the AP/essid fields only

    (( $spawned_wpa == 1 )) && stop_wpa "$INTERFACE"

    # File of 0 length, ie. no ssid's.
    if [[ ! -s "$essids" ]]; then
        rm -f "$essids"
        return 1
    fi

    echo "$essids"
    return 0
}

# Requires already loaded profile
make_wpa_config_file() {
    local WPA_CONFD="$STATE_DIR/wpa.$1"

    # make empty tmp dir with correct permissions, rename it
    check_make_state_dir
    mkdir -p /run/wpa_supplicant
    rm -rf "$WPA_CONFD"
    mv -f "$(mktemp -d --tmpdir=$STATE_DIR)" "$WPA_CONFD" || return 1
    echo "ctrl_interface=/run/wpa_supplicant" >> "$WPA_CONFD/wpa.conf"
    echo "ctrl_interface_group=${WPA_GROUP:-wheel}" >> "$WPA_CONFD/wpa.conf"
    [[ $WPA_COUNTRY ]] && echo "country=$WPA_COUNTRY" >> "$WPA_CONFD/wpa.conf"
    [[ -n "$ADHOC" ]] && echo "ap_scan=2" >> "$WPA_CONFD/wpa.conf"
    echo "$WPA_CONFD/wpa.conf"
}

# Requires already loaded profile
make_wpa_config() {
    case $SECURITY in
    none|wep|wpa)
        case "${ESSID_TYPE:-ascii}" in
            ascii)
                echo "ssid=\"$ESSID\""
                ;;
            hex)
            # Hex ESSID is written unquoted and in lowercase (FS#24333)
                echo "ssid=${ESSID,,}"
                ;;
            *)
                report_fail "ESSID_TYPE must be set to 'ascii' or 'hex'."
                return 1
                ;;
        esac
        if [[ -n "$AP" ]]; then
            echo "bssid=${AP,,}"
        fi
        [[ -n "$ADHOC" ]] && echo "mode=1"
        ;;
    wpa-configsection)
        echo "$CONFIGSECTION"
        ;;
    *)
        return 1
        ;;
    esac

    # Key management
    case $SECURITY in
    none)
        echo "key_mgmt=NONE"
        ;;
    wep)
        echo "key_mgmt=NONE"
        echo "wep_tx_keyidx=0"
        if [[ ${KEY:0:2} == "s:" ]]; then # TODO: does wpa_supplicant handle this as expected?
            echo "wep_key0=\"${KEY:2}\""
        else
            echo "wep_key0=$KEY"
        fi
        ;;
    wpa)
        echo "proto=RSN WPA"
        if [[ "${#KEY}" -eq 64 ]]; then
            echo "psk=$KEY"
        else
            echo "psk=\"$KEY\""
        fi
        ;;
    esac

    # Hidden SSID
    if checkyesno ${HIDDEN:-no}; then
      echo "scan_ssid=1"
    fi
}

# vim: ft=sh ts=4 et sw=4 tw=0: