#!/bin/bash
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Run, inspect and debug
### run a fuzz test on target a device

##
## Usage: fx fuzz [options] [command] [command-arguments]
##
## Options:
##   -d, --device   <name>   Connect to device using Fuchsia link-local name.
##                           Must be specified if multiple devices are present.
##   -f, --foreground        Run in the foreground (default is background).
##   -g, --debug             Disable libFuzzer exception handling.
##   -n, --no-cipd           Skip steps involving CIPD.
##   -o, --output   <dir>    Use the given directory for saving output files.
##                           Defaults to the current directory.
##   -s, --staging  <dir>    Use the given directory for staging temporary
##                           corpus files being transferred on or off of a
##                           target device. Defaults to a temporary directory
##                           that is removed on completion; use this options to
##                           preserve those temporary files on the host.
##
## Commands:
##   help                    Prints this message and exits.
##   list    [name]          Lists fuzzers matching 'name' if provided, or all
##                           fuzzers.
##   corpus  [name]          Lists the corpus instances in CIPD for the named
##                           fuzzer.
##   fetch   <name> [label]  Retrieves the corpus for the named fuzzer.  If
##                           'label' is a directory, installs the corpus from
##                           that location.  Otherwise fetches and installs the
##                           corpus from CIPD given by 'label', which may
##                           either be a CIPD "ref", or a CIPD "tag" of the
##                           form "key:value".  If omitted, 'label' defaults to
##                           "latest".
##   start   <name> [...]    Fetches the latest corpus for a named fuzzer and
##                           starts it. Additional arguments are passed to the
##                           fuzzer. This is default command if not provided.
##   check   <name>          Reports information about the named fuzzer, such as
##                           execution status, corpus size, and number of
##                           crashes.
##   stop    <name>          Stops all instances of the named fuzzer.
##   repro   <name> [...]    Runs the named fuzzer on specific inputs. If no
##                           additional inputs are provided, uses all previously
##                           found crashes.
##   merge   <name> [...]    Fetches the latest corpus in CIPD, merges and
##                           minimizes it with the corpus on device, and stores
##                           the result in CIPD.
##   store   <name>          Gathers the current corpus from the target platform
##                           and publishes it to CIPD.  The package will be
##                           tagged with the current integration revision and
##                           referenced as 'latest'.
##
## Typical workflow is one of three commands:
##   fx fuzz <name>        # Fetches the latest corpus and starts the fuzzer
##   fx fuzz repro <name>  # Replays any test input artifacts found
##   fx fuzz merge <name>  # Merges the current corpus with the latest in CIPD

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/../lib/vars.sh || exit $?

FUZZING_DIR=${FUCHSIA_DIR}/scripts/fuzzing

cmd=
add=0
for arg in "$@"; do
  shift
  case "$arg" in
    -h)
      cmd="help"
      ;;
    -d|--device)
      arg="--device"
      add=2
      ;;
    -g|--debug)
      arg="--debug"
      add=1
      ;;
    -o|--output)
      arg="--output"
      add=2
      ;;
    -s|--staging)
      arg="--staging"
      add=2
      ;;
    -f|--foreground)
      arg="--foreground"
      add=1
      ;;
    -n|--no-cipd)
      arg="--no-cipd"
      add=1
      ;;
    *)
      if [[ -z "$cmd" ]] && [[ $add -eq 0 ]]; then
        cmd="$arg"
      else
        add=1
      fi
      ;;
  esac
  [[ "$cmd" = "help" ]] && break
  [[ $add -eq 0 ]] && continue
  set -- "$@" "$arg"
  add=$(($add - 1))
done

case "$cmd" in
  help)
    fx-command-help
    ;;
  list)
    python ${FUZZING_DIR}/list_fuzzers.py "$@"
    ;;
  corpus)
    python ${FUZZING_DIR}/list_corpora.py "$@"
    ;;
  fetch)
    python ${FUZZING_DIR}/fetch_corpus.py "$@"
    ;;
  start)
    python ${FUZZING_DIR}/start_fuzzer.py "$@"
    ;;
  check)
    python ${FUZZING_DIR}/check_fuzzer.py "$@"
    ;;
  stop)
    python ${FUZZING_DIR}/stop_fuzzer.py "$@"
    ;;
  repro)
    python ${FUZZING_DIR}/repro_units.py "$@"
    ;;
  merge)
    python ${FUZZING_DIR}/merge_corpus.py "$@"
    ;;
  store)
    python ${FUZZING_DIR}/store_corpus.py "$@"
    ;;
  *)
    name="$cmd"
    if python ${FUZZING_DIR}/list_fuzzers.py "$name" ; then
      python ${FUZZING_DIR}/start_fuzzer.py "$name" "$@"
    else
      fx-command-help
    fi
    ;;
esac