85 lines
3.1 KiB
Bash
85 lines
3.1 KiB
Bash
#!/bin/sh
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#
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# Copyright 2019, Digi International Inc.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at http://mozilla.org/MPL/2.0/.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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# Description: create P2P link
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#
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# Configuration variables in '/etc/network/interfaces':
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# Mandatory:
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# p2p-peer-mac <peer-mac>
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# Optional:
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# p2p-discover-window <interval-secs>
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# p2p-freq <channel-freq>
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# p2p-local-address <local-ip>
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# p2p-local-netmask <local-netmask>
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# p2p-network-id <wpa_supplicant_conf P2P network ID>
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#
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# Execute only for the p2p0 interface
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[ "${IFACE}" = "p2p0" ] || exit 0
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log() {
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if type "systemd-cat" >/dev/null 2>/dev/null; then
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systemd-cat -p "${1}" -t p2plink printf "%s" "${2}"
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else
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logger -p "${1}" -t p2plink "${2}"
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fi
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}
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# Exit without error if the peer MAC address is not available
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[ -z "${IF_P2P_PEER_MAC}" ] && { log info "Peer MAC address not available"; exit 0; }
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# wpa_cli reports lowercase MACs, so convert to lowercase
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IF_P2P_PEER_MAC="$(echo "${IF_P2P_PEER_MAC}" | tr 'A-F' 'a-f')"
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if [ "${MODE}" = "start" ]; then
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wpa_cli -i"${IFACE}" p2p_find && sleep 1
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for _ in $(seq "${IF_P2P_DISCOVER_WINDOW:=120}"); do
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wpa_cli -i"${IFACE}" p2p_peers discovered | grep -i -qs "${IF_P2P_PEER_MAC}" && { peer_found="1"; break; }
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sleep 1
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done
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wpa_cli -i"${IFACE}" p2p_stop_find
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[ -z "${peer_found}" ] && { log err "p2p discover: peer NOT found"; exit 1; }
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# Peer found, establish the link
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log info "establish P2P link"
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wpa_cli -i"${IFACE}" p2p_connect "${IF_P2P_PEER_MAC}" pbc ${IF_P2P_NETWORK_ID:+persistent=${IF_P2P_NETWORK_ID}} ${IF_P2P_FREQ:+freq=${IF_P2P_FREQ}} auto
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for _ in $(seq 20); do
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if wpa_cli status 2>&1 | grep -qs "^wpa_state=COMPLETED$"; then
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if wpa_cli status 2>&1 | grep -qs "^mode=P2P GO$"; then
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# P2P GO side: verify the remote peer has connected
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wpa_cli all_sta 2>&1 | grep -i -qs "^p2p_device_addr=${IF_P2P_PEER_MAC}$" && p2p_link_found="1"
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elif wpa_cli status 2>&1 | grep -qs "^mode=station$"; then
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p2p_link_found="1"
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fi
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fi
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if [ -n "${p2p_link_found}" ]; then
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# Configure the newly created interface
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if [ -n "${IF_P2P_LOCAL_ADDRESS}" ]; then
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for P2P_IFNAME in $(basename $(echo /sys/class/net/p2p-p2p0-*)); do
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echo "${P2P_IFNAME}" | grep -qs 'p2p-p2p0-\*' && continue
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ifconfig "${P2P_IFNAME}" "${IF_P2P_LOCAL_ADDRESS}" ${IF_P2P_LOCAL_NETMASK:+netmask ${IF_P2P_LOCAL_NETMASK}} up
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break
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done
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fi
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break
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fi
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sleep 1
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done
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# Give 'ifupdown' a proper error return value if 'wpa_state' is NOT COMPLETED
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[ -n "${p2p_link_found}" ] && true || false
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fi
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