functions.sh
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#
# Common functions used by pktgen scripts
# - Depending on bash 3 (or higher) syntax
#
# Author: Jesper Dangaaard Brouer
# License: GPL
## -- General shell logging cmds --
function err() {
local exitcode=$1
shift
echo "ERROR: $@" >&2
exit $exitcode
}
function warn() {
echo "WARN : $@" >&2
}
function info() {
if [[ -n "$VERBOSE" ]]; then
echo "INFO : $@" >&2
fi
}
## -- Pktgen proc config commands -- ##
export PROC_DIR=/proc/net/pktgen
#
# Three different shell functions for configuring the different
# components of pktgen:
# pg_ctrl(), pg_thread() and pg_set().
#
# These functions correspond to pktgens different components.
# * pg_ctrl() control "pgctrl" (/proc/net/pktgen/pgctrl)
# * pg_thread() control the kernel threads and binding to devices
# * pg_set() control setup of individual devices
function pg_ctrl() {
local proc_file="pgctrl"
proc_cmd ${proc_file} "$@"
}
function pg_thread() {
local thread=$1
local proc_file="kpktgend_${thread}"
shift
proc_cmd ${proc_file} "$@"
}
function pg_set() {
local dev=$1
local proc_file="$dev"
shift
proc_cmd ${proc_file} "$@"
}
# More generic replacement for pgset(), that does not depend on global
# variable for proc file.
function proc_cmd() {
local result
local proc_file=$1
# after shift, the remaining args are contained in $@
shift
local proc_ctrl=${PROC_DIR}/$proc_file
if [[ ! -e "$proc_ctrl" ]]; then
err 3 "proc file:$proc_ctrl does not exists (dev added to thread?)"
else
if [[ ! -w "$proc_ctrl" ]]; then
err 4 "proc file:$proc_ctrl not writable, not root?!"
fi
fi
if [[ "$DEBUG" == "yes" ]]; then
echo "cmd: $@ > $proc_ctrl"
fi
# Quoting of "$@" is important for space expansion
echo "$@" > "$proc_ctrl"
local status=$?
result=$(grep "Result: OK:" $proc_ctrl)
# Due to pgctrl, cannot use exit code $? from grep
if [[ "$result" == "" ]]; then
grep "Result:" $proc_ctrl >&2
fi
if (( $status != 0 )); then
err 5 "Write error($status) occurred cmd: \"$@ > $proc_ctrl\""
fi
}
# Old obsolete "pgset" function, with slightly improved err handling
function pgset() {
local result
if [[ "$DEBUG" == "yes" ]]; then
echo "cmd: $1 > $PGDEV"
fi
echo $1 > $PGDEV
local status=$?
result=`cat $PGDEV | fgrep "Result: OK:"`
if [[ "$result" == "" ]]; then
cat $PGDEV | fgrep Result:
fi
if (( $status != 0 )); then
err 5 "Write error($status) occurred cmd: \"$1 > $PGDEV\""
fi
}
## -- General shell tricks --
function root_check_run_with_sudo() {
# Trick so, program can be run as normal user, will just use "sudo"
# call as root_check_run_as_sudo "$@"
if [ "$EUID" -ne 0 ]; then
if [ -x $0 ]; then # Directly executable use sudo
info "Not root, running with sudo"
sudo "$0" "$@"
exit $?
fi
err 4 "cannot perform sudo run of $0"
fi
}