# Generate dl-tunable-list.h from dl-tunables.list

BEGIN {

  min_of["STRING"]="0"

  max_of["STRING"]="0"

  min_of["INT_32"]="INT32_MIN"

  max_of["INT_32"]="INT32_MAX"

  min_of["UINT_64"]="0"

  max_of["UINT_64"]="UINT64_MAX"

  min_of["SIZE_T"]="0"

  max_of["SIZE_T"]="SIZE_MAX"

  tunable=""

  ns=""

  top_ns=""

}

# Skip over blank lines and comments.

/^#/ {

  next

}

/^[ \t]*$/ {

  next

}

# Beginning of either a top namespace, tunable namespace or a tunable, decided

# on the current value of TUNABLE, NS or TOP_NS.

$2 == "{" {

  if (top_ns == "") {

    top_ns = $1

  }

  else if (ns == "") {

    ns = $1

  }

  else if (tunable == "") {

    tunable = $1

  }

  else {

    printf ("Unexpected occurrence of '{': %s:%d\n", FILENAME, FNR)

    exit 1

  }

  next

}

# End of either a top namespace, tunable namespace or a tunable.

$1 == "}" {

  if (tunable != "") {

    # Tunables definition ended, now fill in default attributes.

    if (!types[top_ns,ns,tunable]) {

      types[top_ns,ns,tunable] = "STRING"

    }

    if (!minvals[top_ns,ns,tunable]) {

      minvals[top_ns,ns,tunable] = min_of[types[top_ns,ns,tunable]]

    }

    if (!maxvals[top_ns,ns,tunable]) {

      maxvals[top_ns,ns,tunable] = max_of[types[top_ns,ns,tunable]]

    }

    if (!env_alias[top_ns,ns,tunable]) {

      env_alias[top_ns,ns,tunable] = "NULL"

    }

    if (!security_level[top_ns,ns,tunable]) {

      security_level[top_ns,ns,tunable] = "SXID_ERASE"

    }

    tunable = ""

  }

  else if (ns != "") {

    ns = ""

  }

  else if (top_ns != "") {

    top_ns = ""

  }

  else {

    printf ("syntax error: extra }: %s:%d\n", FILENAME, FNR)

    exit 1

  }

  next

}

# Everything else, which could either be a tunable without any attributes or a

# tunable attribute.

{

  if (ns == "") {

    printf("Line %d: Invalid tunable outside a namespace: %s\n", NR, $0)

    exit 1

  }

  if (tunable == "") {

    # We encountered a tunable without any attributes, so note it with a

    # default.

    types[top_ns,ns,$1] = "STRING"

    next

  }

  # Otherwise, we have encountered a tunable attribute.

  split($0, arr, ":")

  attr = gensub(/^[ \t]+|[ \t]+$/, "", "g", arr[1])

  val = gensub(/^[ \t]+|[ \t]+$/, "", "g", arr[2])

  if (attr == "type") {

    types[top_ns,ns,tunable] = val

  }

  else if (attr == "minval") {

    minvals[top_ns,ns,tunable] = val

  }

  else if (attr == "maxval") {

    maxvals[top_ns,ns,tunable] = val

  }

  else if (attr == "env_alias") {

    env_alias[top_ns,ns,tunable] = sprintf("\"%s\"", val)

  }

  else if (attr == "security_level") {

    if (val == "SXID_ERASE" || val == "SXID_IGNORE" || val == "NONE") {

      security_level[top_ns,ns,tunable] = val

    }

    else {

      printf("Line %d: Invalid value (%s) for security_level: %s, ", NR, val,

	     $0)

      print("Allowed values are 'SXID_ERASE', 'SXID_IGNORE', or 'NONE'")

      exit 1

    }

  }

  else if (attr == "default") {

    if (types[top_ns,ns,tunable] == "STRING") {

      default_val[top_ns,ns,tunable] = sprintf(".strval = \"%s\"", val);

    }

    else {

      default_val[top_ns,ns,tunable] = sprintf(".numval = %s", val)

    }

  }

}

END {

  if (ns != "") {

    print "Unterminated namespace.  Is a closing brace missing?"

    exit 1

  }

  print "/* AUTOGENERATED by gen-tunables.awk.  */"

  print "#ifndef _TUNABLES_H_"

  print "# error \"Do not include this file directly.\""

  print "# error \"Include tunables.h instead.\""

  print "#endif"

  print "#include <dl-procinfo.h>\n"

  # Now, the enum names

  print "\ntypedef enum"

  print "{"

  for (tnm in types) {

    split (tnm, indices, SUBSEP);

    t = indices[1];

    n = indices[2];

    m = indices[3];

    printf ("  TUNABLE_ENUM_NAME(%s, %s, %s),\n", t, n, m);

  }

  print "} tunable_id_t;\n"

  # Finally, the tunable list.

  print "\n#ifdef TUNABLES_INTERNAL"

  print "static tunable_t tunable_list[] attribute_relro = {"

  for (tnm in types) {

    split (tnm, indices, SUBSEP);

    t = indices[1];

    n = indices[2];

    m = indices[3];

    printf ("  {TUNABLE_NAME_S(%s, %s, %s)", t, n, m)

    printf (", {TUNABLE_TYPE_%s, %s, %s}, {%s}, NULL, TUNABLE_SECLEVEL_%s, %s},\n",

	    types[t,n,m], minvals[t,n,m], maxvals[t,n,m],

	    default_val[t,n,m], security_level[t,n,m], env_alias[t,n,m]);

  }

  print "};"

  print "#endif"

}