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61 lines
2.7 KiB
Bash
61 lines
2.7 KiB
Bash
#!/bin/sh
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# NOTE: Close any non-standard fds, so that it doesn't come back to bite us in the ass with USBMS (or sockets) later...
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for fd in /proc/"$$"/fd/*; do
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close_me="false"
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fd_id="$(basename "${fd}")"
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fd_path="$(readlink -f "${fd}")"
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if [ -e "${fd}" ] && [ "${fd_id}" -gt 2 ]; then
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if [ -S "${fd}" ]; then
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# Close any and all sockets
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# NOTE: Old busybox builds do something stupid when attempting to canonicalize pipes/sockets...
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# (i.e., they'll spit out ${fd} as-is, losing any and all mention of a socket/pipe).
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fd_path="$(readlink "${fd}")"
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close_me="true"
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elif [ -p "${fd}" ]; then
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# We *might* be catching temporary pipes created by this very test, se we have to leave pipes alone...
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# Although it would take extremely unlucky timing, as by the time we go through the top-level -e test,
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# said temporary pipe is already gone, and as such we *should* never really enter this branch for temporary pipes ;).
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fd_path="$(readlink "${fd}")"
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close_me="false"
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else
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# NOTE: dash (meaning, in turn, busybox's ash) uses fd 10+ open to /dev/tty or $0 (w/ CLOEXEC)
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# NOTE: The last fd != fd_path check is there to (potentially) whitelist non-regular files we might have failed to handle,
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# it's designed to match the unhelpful result from old buysbox's readlink -f on non-regular files (c.f., previous notes).
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if [ "${fd_path}" != "/dev/tty" ] && [ "${fd_path}" != "$(readlink -f "${0}")" ] && [ "${fd}" != "${fd_path}" ]; then
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close_me="true"
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else
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close_me="false"
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fi
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fi
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fi
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if [ "${fd_id}" -gt 2 ]; then
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if [ "${close_me}" = "true" ]; then
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eval "exec ${fd_id}>&-"
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echo "[obtain-ip.sh] Closed fd ${fd_id} -> ${fd_path}"
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else
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# Try to log something more helpful when old busybox's readlink -f mangled it...
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if [ "${fd}" = "${fd_path}" ]; then
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fd_path="${fd_path} => $(readlink "${fd}")"
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if [ ! -e "${fd}" ]; then
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# Flag (potentially?) temporary items as such
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fd_path="${fd_path} (temporary?)"
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fi
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fi
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echo "[obtain-ip.sh] Left fd ${fd_id} -> ${fd_path} open"
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fi
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fi
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done
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./release-ip.sh
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# NOTE: Prefer dhcpcd over udhcpc if available. That's what Nickel uses,
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# and udhcpc appears to trip some insanely wonky corner cases on current FW (#6421)
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if [ -x "/sbin/dhcpcd" ]; then
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dhcpcd -d -t 30 -w "${INTERFACE}"
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else
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udhcpc -S -i "${INTERFACE}" -s /etc/udhcpc.d/default.script -b -q
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fi
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