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Diffstat (limited to 'plugins.d/cgroup-network-helper.sh')
| -rwxr-xr-x | plugins.d/cgroup-network-helper.sh | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/plugins.d/cgroup-network-helper.sh b/plugins.d/cgroup-network-helper.sh deleted file mode 100755 index f07059986..000000000 --- a/plugins.d/cgroup-network-helper.sh +++ /dev/null @@ -1,251 +0,0 @@ -#!/usr/bin/env bash - -# cgroup-network-helper.sh -# detect container and virtual machine interfaces -# -# (C) 2017 Costa Tsaousis -# GPL v3+ -# -# This script is called as root (by cgroup-network), with either a pid, or a cgroup path. -# It tries to find all the network interfaces that belong to the same cgroup. -# -# It supports several method for this detection: -# -# 1. cgroup-network (the binary father of this script) detects veth network interfaces, -# by examining iflink and ifindex IDs and switching namespaces -# (it also detects the interface name as it is used by the container). -# -# 2. this script, uses /proc/PID/fdinfo to find tun/tap network interfaces. -# -# 3. this script, calls virsh to find libvirt network interfaces. -# - -# ----------------------------------------------------------------------------- - -# the system path is cleared by cgroup-network -[ -f /etc/profile ] && source /etc/profile - -export LC_ALL=C - -PROGRAM_NAME="$(basename "${0}")" - -logdate() { - date "+%Y-%m-%d %H:%M:%S" -} - -log() { - local status="${1}" - shift - - echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}" - -} - -warning() { - log WARNING "${@}" -} - -error() { - log ERROR "${@}" -} - -info() { - log INFO "${@}" -} - -fatal() { - log FATAL "${@}" - exit 1 -} - -debug=0 -debug() { - [ "${debug}" = "1" ] && log DEBUG "${@}" -} - -# ----------------------------------------------------------------------------- -# check for BASH v4+ (required for associative arrays) - -[ $(( ${BASH_VERSINFO[0]} )) -lt 4 ] && \ - fatal "BASH version 4 or later is required (this is ${BASH_VERSION})." - -# ----------------------------------------------------------------------------- -# parse the arguments - -pid= -cgroup= -while [ ! -z "${1}" ] -do - case "${1}" in - --cgroup) cgroup="${2}"; shift 1;; - --pid|-p) pid="${2}"; shift 1;; - --debug|debug) debug=1;; - *) fatal "Cannot understand argument '${1}'";; - esac - - shift -done - -if [ -z "${pid}" -a -z "${cgroup}" ] -then - fatal "Either --pid or --cgroup is required" -fi - -# ----------------------------------------------------------------------------- - -set_source() { - [ ${debug} -eq 1 ] && echo "SRC ${*}" -} - - -# ----------------------------------------------------------------------------- -# veth interfaces via cgroup - -# cgroup-network can detect veth interfaces by itself (written in C). -# If you seek for a shell version of what it does, check this: -# https://github.com/firehol/netdata/issues/474#issuecomment-317866709 - - -# ----------------------------------------------------------------------------- -# tun/tap interfaces via /proc/PID/fdinfo - -# find any tun/tap devices linked to a pid -proc_pid_fdinfo_iff() { - local p="${1}" # the pid - - debug "Searching for tun/tap interfaces for pid ${p}..." - set_source "fdinfo" - grep ^iff:.* "${NETDATA_HOST_PREFIX}/proc/${p}/fdinfo"/* 2>/dev/null | cut -f 2 -} - -find_tun_tap_interfaces_for_cgroup() { - local c="${1}" # the cgroup path - - # for each pid of the cgroup - # find any tun/tap devices linked to the pid - if [ -f "${c}/emulator/cgroup.procs" ] - then - local p - for p in $(< "${c}/emulator/cgroup.procs" ) - do - proc_pid_fdinfo_iff ${p} - done - fi -} - - -# ----------------------------------------------------------------------------- -# virsh domain network interfaces - -virsh_cgroup_to_domain_name() { - local c="${1}" # the cgroup path - - debug "extracting a possible virsh domain from cgroup ${c}..." - - # extract for the cgroup path - sed -n -e "s|.*/machine-qemu\\\\x2d[0-9]\+\\\\x2d\(.*\)\.scope$|\1|p" \ - -e "s|.*/machine/\(.*\)\.libvirt-qemu$|\1|p" \ - <<EOF -${c} -EOF -} - -virsh_find_all_interfaces_for_cgroup() { - local c="${1}" # the cgroup path - - # the virsh command - local virsh="$(which virsh 2>/dev/null || command -v virsh 2>/dev/null)" - - if [ ! -z "${virsh}" ] - then - local d="$(virsh_cgroup_to_domain_name "${c}")" - - if [ ! -z "${d}" ] - then - debug "running: virsh domiflist ${d}; to find the network interfaces" - - # match only 'network' interfaces from virsh output - - set_source "virsh" - "${virsh}" -r domiflist ${d} |\ - sed -n \ - -e "s|^\([^[:space:]]\+\)[[:space:]]\+network[[:space:]]\+\([^[:space:]]\+\)[[:space:]]\+[^[:space:]]\+[[:space:]]\+[^[:space:]]\+$|\1 \1_\2|p" \ - -e "s|^\([^[:space:]]\+\)[[:space:]]\+bridge[[:space:]]\+\([^[:space:]]\+\)[[:space:]]\+[^[:space:]]\+[[:space:]]\+[^[:space:]]\+$|\1 \1_\2|p" - else - debug "no virsh domain extracted from cgroup ${c}" - fi - else - debug "virsh command is not available" - fi -} - -# ----------------------------------------------------------------------------- - -find_all_interfaces_of_pid_or_cgroup() { - local p="${1}" c="${2}" # the pid and the cgroup path - - if [ ! -z "${pid}" ] - then - # we have been called with a pid - - proc_pid_fdinfo_iff ${p} - - elif [ ! -z "${c}" ] - then - # we have been called with a cgroup - - info "searching for network interfaces of cgroup '${c}'" - - find_tun_tap_interfaces_for_cgroup "${c}" - virsh_find_all_interfaces_for_cgroup "${c}" - - else - - error "Either a pid or a cgroup path is needed" - return 1 - - fi - - return 0 -} - -# ----------------------------------------------------------------------------- - -# an associative array to store the interfaces -# the index is the interface name as seen by the host -# the value is the interface name as seen by the guest / container -declare -A devs=() - -# store all interfaces found in the associative array -# this will also give the unique devices, as seen by the host -last_src= -while read host_device guest_device -do - [ -z "${host_device}" ] && continue - - [ "${host_device}" = "SRC" ] && last_src="${guest_device}" && continue - - # the default guest_device is the host_device - [ -z "${guest_device}" ] && guest_device="${host_device}" - - # when we run in debug, show the source - debug "Found host device '${host_device}', guest device '${guest_device}', detected via '${last_src}'" - - [ -z "${devs[${host_device}]}" -o "${devs[${host_device}]}" = "${host_device}" ] && \ - devs[${host_device}]="${guest_device}" - -done < <( find_all_interfaces_of_pid_or_cgroup "${pid}" "${cgroup}" ) - -# print the interfaces found, in the format netdata expects them -found=0 -for x in "${!devs[@]}" -do - found=$((found + 1)) - echo "${x} ${devs[${x}]}" -done - -debug "found ${found} network interfaces for pid '${pid}', cgroup '${cgroup}', run as ${USER}, ${UID}" - -# let netdata know if we found any -[ ${found} -eq 0 ] && exit 1 -exit 0 |