9dc35a57a2
- Introduced a web GUI for managing 5G connections, replacing the standalone 5g-router service. - Updated scripts to ensure exclusive access to the AT port, preventing conflicts. - Improved troubleshooting documentation in 5G_MODEM_TROUBLESHOOTING.md, adding checks for processes using the AT port. - Enhanced connection management in the web app, including auto-connect and detailed status APIs. - Updated installation scripts to reflect changes in service management and dependencies.
210 lines
7.1 KiB
Bash
210 lines
7.1 KiB
Bash
#!/bin/sh
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# Alpine 5G Router – connection script (run by 5g-router service or manually)
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# Uses /etc/5g-router.conf if present. Supports watchdog and failover.
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# Rev: 2 (see REVISION in repo root)
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set -e
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CONFIG="/etc/5g-router.conf"
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LOG_FILE="/var/log/5g-router.log"
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# Defaults
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AT_PORT="/dev/ttyUSB1"
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APN="internet"
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WAN_IF="eth1"
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LAN_IF="eth0.100"
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FAILOVER_ENABLED="no"
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FAILOVER_IF="eth0"
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FAILOVER_METRIC="202"
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WATCHDOG_INTERVAL="0"
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LOG_SIGNAL="yes"
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WEAK_SIGNAL_CSQ="10"
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[ -f "$CONFIG" ] && . "$CONFIG" || true
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# Lock file for exclusive AT port access (shared with modem-status-at.sh)
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AT_LOCK="/var/lock/5g-at.lock"
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exec 9>"$AT_LOCK"
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flock -n 9 || { echo "Another process is using the AT port, waiting..." >&2; flock 9; }
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# Log to file; also to stdout only when running in a terminal (avoids duplicate lines when service redirects stdout to log)
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log() {
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_m="[$(date '+%Y-%m-%d %H:%M:%S')] $1"
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echo "$_m" >> "$LOG_FILE" 2>/dev/null || true
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[ -t 1 ] && echo "$_m" || true
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}
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# Fix broken /dev/ttyUSB* node (if it is a regular file instead of char device - e.g. after modem reconnect)
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# Also remove stray /dev/ttyUSB (no digit) which can appear and steal the name from real devices
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fix_ttyusb_if_needed() {
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# Remove stray /dev/ttyUSB (no number) if it's a regular file
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if [ -e /dev/ttyUSB ] && [ -f /dev/ttyUSB ] && [ ! -c /dev/ttyUSB ]; then
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rm -f /dev/ttyUSB
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fi
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case "$AT_PORT" in
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/dev/ttyUSB[0-9]*) ;;
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*) return 0 ;;
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esac
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[ ! -e "$AT_PORT" ] && return 0 || true
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if [ -f "$AT_PORT" ] && [ ! -c "$AT_PORT" ]; then
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_num="${AT_PORT#/dev/ttyUSB}"
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log "Fixing $AT_PORT (was regular file, recreating as char device)"
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rm -f "$AT_PORT"
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mknod "$AT_PORT" c 188 "$_num"
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chmod 660 "$AT_PORT"
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chown root:dialout "$AT_PORT" 2>/dev/null || true
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fi
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}
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# Never write to AT_PORT unless it is a character device; otherwise a redirect would create a regular file and break the port
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get_at_response() {
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_cmd="$1"
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_wait="${2:-2}"
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timeout $((_wait + 4)) sh -c "
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[ -c \"$AT_PORT\" ] || exit 1
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cat $AT_PORT 2>/dev/null &
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_pid=\$!
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sleep 0.5
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echo \"${_cmd}\r\" > $AT_PORT
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sleep $_wait
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kill \$_pid 2>/dev/null
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" 2>&1
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}
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wait_for_modem() {
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log "Waiting for modem AT port..."
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for _i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
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fix_ttyusb_if_needed
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if [ -c "$AT_PORT" ]; then
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log "Modem AT port available"
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return 0
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fi
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sleep 2
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done
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log "Modem AT port not available"
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return 1
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}
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check_usb_mode() {
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if lsusb 2>/dev/null | grep -q "0e8d:7127"; then
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log "WARN: Modem is in Mode 41 (7127). AT commands may not work. Reboot or power-cycle modem."
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return 1
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fi
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return 0
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}
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do_connect() {
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# eth1 (RNDIS) does NOT provide DHCP. We get IP (and DNS) only via AT commands
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# and configure the interface manually. Do not run dhclient on eth1.
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check_usb_mode || return 1
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# Modem can take 5–15s to respond after port appears at boot; retry initial AT up to 3 times
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_at_ok=0
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for _try in 1 2 3; do
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if get_at_response "AT" 5 | grep -q "OK"; then
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_at_ok=1
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break
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fi
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if [ $_try -lt 3 ]; then
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log "AT not OK, retry $_try/3 in 5s..."
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sleep 5
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fi
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done
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if [ $_at_ok -eq 0 ]; then
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log "AT not OK (try longer wait or different AT port)"
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return 1
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fi
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# Signal (optional log)
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_resp=$(get_at_response "AT+CSQ" 1)
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_csq=$(echo "$_resp" | grep "+CSQ:" | grep -oE '[0-9]+' | head -1)
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[ -n "$_csq" ] && [ "$LOG_SIGNAL" = "yes" ] && echo "$(date -Iseconds) CSQ=$_csq" >> "$LOG_FILE" 2>/dev/null || true
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[ -n "$_csq" ] && [ -n "$WEAK_SIGNAL_CSQ" ] && [ "$WEAK_SIGNAL_CSQ" -gt 0 ] && [ "$_csq" -lt "$WEAK_SIGNAL_CSQ" ] && log "WARN weak signal CSQ=$_csq" || true
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log "Configuring APN: $APN"
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get_at_response "AT+CGDCONT=1,\"IP\",\"$APN\"" 2 | grep -q "OK" || true
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log "Activating PDP context..."
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get_at_response "AT+CGACT=1,1" 3 | grep -qE "(OK|CGEV)" || true
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_ip=""
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for _retry in 1 2 3 4 5; do
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_resp=$(get_at_response "AT+CGPADDR=1" 2)
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_ip=$(echo "$_resp" | grep "+CGPADDR:" | grep -oE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' | head -1)
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if [ -n "$_ip" ]; then break; fi
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if [ $_retry -lt 5 ]; then
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log "No IP yet, retry $_retry/5 in 3s..."
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sleep 3
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fi
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done
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if [ -z "$_ip" ]; then
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log "Could not get modem IP (check signal/registration: AT+CSQ, AT+CEREG?)"
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return 1
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fi
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# Get DNS from modem (AT+CGCONTRDP=1); modem does not provide DHCP, only IP/DNS via AT
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_dns1=""; _dns2=""
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_contrdp=$(get_at_response "AT+CGCONTRDP=1" 2)
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_allips=""
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for _a in $(echo "$_contrdp" | grep -oE '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+'); do
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[ "$_a" = "$_ip" ] && continue || true
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_allips="${_allips} ${_a}"
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done
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for _a in $_allips; do
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[ -z "$_a" ] && continue || true
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_dns2="$_dns1"
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_dns1="$_a"
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done
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[ -z "$_dns1" ] && [ -n "$DNS_SERVERS" ] && _dns1=$(echo "$DNS_SERVERS" | cut -d',' -f1 | tr -d ' ') && _dns2=$(echo "$DNS_SERVERS" | cut -d',' -f2 | tr -d ' ')
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if [ -n "$_dns1" ]; then
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: > /etc/resolv.conf
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echo "nameserver $_dns1" >> /etc/resolv.conf
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[ -n "$_dns2" ] && echo "nameserver $_dns2" >> /etc/resolv.conf || true
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log "DNS set (from modem or config)"
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fi
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log "Configuring $WAN_IF with IP $_ip (no DHCP - from AT+CGPADDR=1)"
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ip link set "$WAN_IF" up 2>/dev/null || true
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ip addr flush dev "$WAN_IF" 2>/dev/null || true
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ip addr add "$_ip/32" dev "$WAN_IF"
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ip route add default dev "$WAN_IF" metric 50 2>/dev/null || true
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log "Interface configured"
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log "Setting up NAT..."
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echo 1 > /proc/sys/net/ipv4/ip_forward
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iptables -t nat -C POSTROUTING -o "$WAN_IF" -j MASQUERADE 2>/dev/null || iptables -t nat -A POSTROUTING -o "$WAN_IF" -j MASQUERADE
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iptables -C FORWARD -i "$LAN_IF" -o "$WAN_IF" -j ACCEPT 2>/dev/null || iptables -A FORWARD -i "$LAN_IF" -o "$WAN_IF" -j ACCEPT
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iptables -C FORWARD -i "$WAN_IF" -o "$LAN_IF" -m state --state RELATED,ESTABLISHED -j ACCEPT 2>/dev/null || iptables -A FORWARD -i "$WAN_IF" -o "$LAN_IF" -m state --state RELATED,ESTABLISHED -j ACCEPT
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log "NAT configured"
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return 0
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}
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do_failover() {
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[ "$FAILOVER_ENABLED" != "yes" ] && return 0 || true
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# Ensure there is a default route via failover interface (higher metric so 5G wins when up)
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ip route add default dev "$FAILOVER_IF" metric "$FAILOVER_METRIC" 2>/dev/null || true
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}
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# Main
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run_once() {
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wait_for_modem || { do_failover; return 1; }
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if do_connect; then
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log "5G connection successful!"
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return 0
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else
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do_failover
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return 1
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fi
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}
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if [ -n "$WATCHDOG_INTERVAL" ] && [ "$WATCHDOG_INTERVAL" -gt 0 ]; then
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log "Starting 5G connection (watchdog every ${WATCHDOG_INTERVAL}s)..."
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while true; do
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run_once || true
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sleep "$WATCHDOG_INTERVAL"
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done
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else
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log "Starting 5G connection..."
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run_once || true
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log "Holding process for service (stop with: service 5g-router stop)."
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exec sleep infinity
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fi
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