summaryrefslogtreecommitdiffstats
path: root/src/lib/8021x
blob: 7a841a494345d97796645b667f27c5d466705615 (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
## /usr/lib/network/globals needs to be sourced before this file


## Wrapper around wpa_cli to deal with supplicant configurations that set a
## non-standard control path
# $1: interface name
# $2...: call to the supplicant
wpa_call() {
    local args=( "-i" "$1" )
    shift

    if [[ $WPA_CTRL_DIR ]]; then
        args+=("-p" "$WPA_CTRL_DIR")
    elif [[ $WPAConfigFile ]] && grep -q "^[[:space:]]*ctrl_interface=" "$WPAConfigFile"; then
        WPA_CTRL_DIR=$(grep -m1 "^[[:space:]]*ctrl_interface=" "$WPAConfigFile")
        WPA_CTRL_DIR=${WPA_CTRL_DIR#*ctrl_interface=}
        if [[ $WPA_CTRL_DIR == DIR=* ]]; then
            WPA_CTRL_DIR=${WPA_CTRL_DIR:4}
            WPA_CTRL_DIR=${WPA_CTRL_DIR%% GROUP=*}
        fi
        args+=( "-p" "$WPA_CTRL_DIR" )
    fi
    do_debug wpa_cli "${args[@]}" "$@"
}

## Check if an instance of the wpa supplicant is active on an interface
# $1: interface name
wpa_is_active(){
    [[ $(wpa_call "$1" ping 2> /dev/null) == "PONG" ]]
}

## Retrieves the state of an instance of the wpa supplicant
## Displays one of: DISCONNECTED, INTERFACE_DISABLED, INACTIVE, SCANNING,
##                  AUTHENTICATING, ASSOCIATING, ASSOCIATED, 4WAY_HANDSHAKE,
##                  GROUP_HANDSHAKE, COMPLETED
# $1: interface name
wpa_get_state() {
    local state
    state=$(wpa_call $1 status | grep -m1 "^wpa_state=") || return 1
    echo ${state#wpa_state=}
}

## Waits until the wpa supplicant reaches a listed state
# $1: timeout
# $2: interface name
# $3...: accepted states
wpa_wait_until_state() {
    local timeout=$1 interface=$2 states=( "${@:3}" )
    timeout_wait "$timeout" \
                 'in_array "$(wpa_get_state "$interface")" "${states[@]}"'
}

## Waits while the wpa supplicant is in a listed state
# $1: timeout
# $2: interface name
# $3...: rejected states
wpa_wait_while_state() {
    local timeout=$1 interface=$2 states=( "${@:3}" )
    timeout_wait "$timeout" \
                 '! in_array "$(wpa_get_state "$interface")" "${states[@]}"'
}

## Start an instance of the wpa supplicant
# $1: interface name
# $2: interface driver(s)
# $3: configuration file
wpa_start() {
    local interface=$1 driver=$2 configuration=$3
    local pidfile="/run/wpa_supplicant_$interface.pid"

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

    do_debug wpa_supplicant -B -P "$pidfile" -i "$interface" -D "$driver" \
                            "$configuration" $WPAOptions

    # Wait up to one second for the pid file to appear
    if ! timeout_wait 1 '[[ -f "$pidfile" ]]'; then
        # Remove the configuration file if it was generated
        configuration="$STATE_DIR/wpa_supplicant_$interface.conf"
        [[ -f $configuration && -O $configuration ]] && rm -f "$configuration"
        return 1
    fi
}

## Stop an instance of the wpa supplicant
# $1: interface name
wpa_stop() {
    local interface=$1 config_file="$STATE_DIR/wpa_supplicant_$1.conf"
    # We need this as long as wpa_cli has a different default than netctl
    if [[ -z $WPA_CTRL_DIR && -z $WPAConfigFile ]]; then
        WPA_CTRL_DIR="/run/wpa_supplicant"
    fi

    # Done if wpa_supplicant is already terminated for this interface
    [[ -z $WPA_CTR_DIR || -e "$WPA_CTRL_DIR/$interface" ]] || return

    wpa_call "$interface" terminate > /dev/null
    [[ -f $config_file && -O $config_file ]] && rm -f "$config_file"

    # Wait up to one second for the pid file to be removed
    if ! timeout_wait 1 '[[ ! -f "/run/wpa_supplicant_$interface.pid" ]]'; then
        kill "$(< "/run/wpa_supplicant_$interface.pid")" &> /dev/null
    fi
}

## Scan for networks within range
# $1: interface name
# $2: fields of the wpa_supplicant scan_results
wpa_supplicant_scan() {
    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.

    [[ $interface ]] || return 1
    essids=$(mktemp --tmpdir essid.XXXXXXXX)

    if ! wpa_is_active "$interface"; then
        wpa_start "$interface" "${WPADriver:-nl80211,wext}" || return 1
        spawned_wpa=1
    fi

    wpa_call "$interface" scan > /dev/null
    # Wait at least 3 seconds for scan results
    sleep 3
    # Sometimes, that is not enough
    wpa_wait_while_state 7 "$interface" "SCANNING"
    wpa_call "$interface" scan_results |
        tail -n+2 |
        sort -rn -k3 |
        sort -u -k5 |
        sort -rn -k3 |
        cut -f"$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 )) && wpa_stop "$interface"

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

    echo "$essids"
}

## Print a string within quotes, unless it starts with the "-modifier
## Quoted:     string   "string"   '""string"'
## Non-quoted: \"string "\"string" '"string'
# $1: string
wpa_quote() {
    local string=$1
    if [[ $string == \"* ]]; then
        printf '%s' "${string:1}"
    else
        printf '"%s"' "$string"
    fi
}

## Create a configuration file for wpa_supplicant without any network blocks
# $1: interface name
wpa_make_config_file() {
    local config_file="$STATE_DIR/wpa_supplicant_$1.conf"

    if [[ -e $config_file ]]; then
        report_debug "The anticipated filename '$config_file' is not available"
        return 1
    fi
    mkdir -p "$STATE_DIR" /run/wpa_supplicant
    if ! : > "$config_file"; then
        report_debug "Could not create the configuration file '$config_file'"
        return 1
    fi
    chmod 600 "$config_file"

    echo "ctrl_interface=/run/wpa_supplicant" >> "$config_file"
    echo "ctrl_interface_group=${WPAGroup:-wheel}" >> "$config_file"
    [[ $Country ]] && echo "country=$Country" >> "$config_file"
    if is_yes "${AdHoc:-no}"; then
        echo "ap_scan=2" >> "$config_file"
    fi
    echo "$config_file"
}

## Generate a network block for wpa_supplicant
# $Security: type of wireless security
wpa_make_config_block() {
    case $Security in
      none|wep|wpa)
        echo "ssid=$(wpa_quote "$ESSID")"
        [[ $AP ]] && echo "bssid=${AP,,}"
        is_yes "${AdHoc:-no}" && echo "mode=1"
      ;;
      wpa-configsection)
        printf "%s\n" "${WPAConfigSection[@]}"
        return
      ;;
      *)
        report_error "Unsupported security setting: '$Security'"
        return 1
      ;;
    esac

    # Key management
    case $Security in
      none)
        echo "key_mgmt=NONE"
      ;;
      wep)
        echo "key_mgmt=NONE"
        echo "wep_tx_keyidx=0"
        echo "wep_key0=$(wpa_quote "$Key")"
      ;;
      wpa)
        echo "proto=RSN WPA"
        if [[ "${#Key}" -eq 64 ]]; then
            echo "psk=$Key"
        else
            echo "psk=$(wpa_quote "$Key")"
        fi
      ;;
    esac

    # Hidden SSID
    is_yes "${Hidden:-no}" && echo "scan_ssid=1"

    # Priority group for the network
    [[ $Priority ]] && echo "priority=$Priority"
}


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