#!/bin/sh
# $Id: with-mibs,v 1.1 2016/07/11 16:48:57 friedman Exp $

mibdirs()
{
    # By default earlier found mibs take precedence
    find $HOME/.snmp/mibs              \
         $HOME/etc/misc/.snmp/mibs     \
         /usr/share/mibs               \
         /usr/share/snmp/mibs          \
                                       \
         -type d -print 2> /dev/null   \
                                       \
        | sed -n                       \
              -e 'H'                   \
              -e '${'                  \
              -e '   g'                \
              -e '   s/\n/:/g'         \
              -e '   s/^://'           \
              -e '   p'                \
              -e ' }'
}

need_arg()
{
    arg=$1
    shift

    while :; do
        case $# in
            0 ) # If caller is asking about whether -c (community) is
                # needed, the answer is no for snmp version 3.
                #
                # In order for this to be effective, caller should check
                # for -v first.
                case $snmpver:$arg in
                      1:-c ) return 0 ;;
                     2c:-c ) return 0 ;;
                      *:-c ) return 1 ;;
                      *:*  ) return 0 ;;
                esac
        esac

        case $1 in
            -v  ) snmpver=$2      ;;
            -v* ) snmpver=${1#-v} ;;
        esac

        case $1 in ${arg}* ) return 1 ;; esac

        shift
    done
}

main()
{
    prog=$1
    progname=${prog##*/}
    shift

     case $progname in
         snmp*walk ) set : -Cc "$@" ; shift ;;
     esac

    if need_arg -v "$@"; then
        case $progname in
            *bulk* ) set : -v 2c "$@" ;;
            *      ) set : -v 1  "$@" ;;
        esac
        shift
    fi

    if need_arg -c "$@"; then
        set : -c public "$@"
        shift
    fi

    if need_arg -m "$@"; then
        set : -m ALL "$@"
        shift
    fi
    # -M -dirs prepends to default path; +dirs appends.
    if need_arg -M "$@"; then
        set : -M "-`mibdirs`:." "$@"
        shift
    fi

    exec "$prog" "$@"
}

main "$@"

# eof