// Copyright 2014 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <string>
#include <vector>

#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/ssl.h>

#if defined(OPENSSL_WINDOWS)
#include <fcntl.h>
#include <io.h>
#else
#include <libgen.h>
#include <signal.h>
#endif

#include "internal.h"


BSSL_NAMESPACE_BEGIN

static bool IsFIPS(const std::vector<std::string> &args) {
  printf("%d\n", FIPS_mode());
  return true;
}

typedef bool (*tool_func_t)(const std::vector<std::string> &args);

struct Tool {
  const char *name;
  tool_func_t func;
};

static const Tool kTools[] = {
    {"ciphers", Ciphers},
    {"client", Client},
    {"isfips", IsFIPS},
    {"generate-ech", GenerateECH},
    {"generate-ed25519", GenerateEd25519Key},
    {"genrsa", GenerateRSAKey},
    {"md5sum", MD5Sum},
    {"pkcs12", DoPKCS12},
    {"rand", Rand},
    {"s_client", Client},
    {"s_server", Server},
    {"server", Server},
    {"sha1sum", SHA1Sum},
    {"sha224sum", SHA224Sum},
    {"sha256sum", SHA256Sum},
    {"sha384sum", SHA384Sum},
    {"sha512sum", SHA512Sum},
    {"sha512256sum", SHA512256Sum},
    {"sign", Sign},
    {"", nullptr},
};

static void usage(const char *name) {
  printf("Usage: %s COMMAND\n", name);
  printf("\n");
  printf("Available commands:\n");

  for (size_t i = 0;; i++) {
    const Tool &tool = kTools[i];
    if (tool.func == nullptr) {
      break;
    }
    printf("    %s\n", tool.name);
  }
}

static tool_func_t FindTool(const std::string &name) {
  for (size_t i = 0;; i++) {
    const Tool &tool = kTools[i];
    if (tool.func == nullptr || name == tool.name) {
      return tool.func;
    }
  }
}

BSSL_NAMESPACE_END

using namespace bssl;

int main(int argc, char **argv) {
#if defined(OPENSSL_WINDOWS)
  // Read and write in binary mode. This makes bssl on Windows consistent with
  // bssl on other platforms, and also makes it consistent with MSYS's commands
  // like diff(1) and md5sum(1). This is especially important for the digest
  // commands.
  if (_setmode(_fileno(stdin), _O_BINARY) == -1) {
    perror("_setmode(_fileno(stdin), O_BINARY)");
    return 1;
  }
  if (_setmode(_fileno(stdout), _O_BINARY) == -1) {
    perror("_setmode(_fileno(stdout), O_BINARY)");
    return 1;
  }
  if (_setmode(_fileno(stderr), _O_BINARY) == -1) {
    perror("_setmode(_fileno(stderr), O_BINARY)");
    return 1;
  }
#else
  signal(SIGPIPE, SIG_IGN);
#endif

  int starting_arg = 1;
  tool_func_t tool = nullptr;
#if !defined(OPENSSL_WINDOWS)
  tool = FindTool(basename(argv[0]));
#endif
  if (tool == nullptr) {
    starting_arg++;
    if (argc > 1) {
      tool = FindTool(argv[1]);
    }
  }
  if (tool == nullptr) {
    usage(argv[0]);
    return 1;
  }

  std::vector<std::string> args;
  for (int i = starting_arg; i < argc; i++) {
    args.push_back(argv[i]);
  }

  if (!tool(args)) {
    ERR_print_errors_fp(stderr);
    return 1;
  }

  return 0;
}