config.c

关于tor匿名通信的源代码

  while (i < argc) {
    if (!strcmp(argv[i],"-f") ||
        !strcmp(argv[i],"--hash-password")) {
      i += 2; /* command-line option with argument. ignore them. */
      continue;
    } else if (!strcmp(argv[i],"--list-fingerprint") ||
               !strcmp(argv[i],"--verify-config") ||
               !strcmp(argv[i],"--ignore-missing-torrc") ||
               !strcmp(argv[i],"--quiet") ||
               !strcmp(argv[i],"--hush")) {
      i += 1; /* command-line option. ignore it. */
      continue;
    } else if (!strcmp(argv[i],"--nt-service") ||
               !strcmp(argv[i],"-nt-service")) {
      i += 1;
      continue;
    }

    if (i == argc-1) {
      log_warn(LD_CONFIG,"Command-line option '%s' with no value. Failing.",
               argv[i]);
      config_free_lines(front);
      return -1;
    }

    *new = tor_malloc_zero(sizeof(config_line_t));
    s = argv[i];

    while (*s == '-')
      s++;

    (*new)->key = tor_strdup(expand_abbrev(&options_format, s, 1, 1));
    (*new)->value = tor_strdup(argv[i+1]);
    (*new)->next = NULL;
    log(LOG_DEBUG, LD_CONFIG, "Commandline: parsed keyword '%s', value '%s'",
        (*new)->key, (*new)->value);

    new = &((*new)->next);
    i += 2;
  }
  *result = front;
  return 0;
}

/** Helper: allocate a new configuration option mapping 'key' to 'val',
 * append it to *<b>lst</b>. */
static void
config_line_append(config_line_t **lst,
                   const char *key,
                   const char *val)
{
  config_line_t *newline;

  newline = tor_malloc(sizeof(config_line_t));
  newline->key = tor_strdup(key);
  newline->value = tor_strdup(val);
  newline->next = NULL;
  while (*lst)
    lst = &((*lst)->next);

  (*lst) = newline;
}

/** Helper: parse the config string and strdup into key/value
 * strings. Set *result to the list, or NULL if parsing the string
 * failed.  Return 0 on success, -1 on failure. Warn and ignore any
 * misformatted lines. */
int
config_get_lines(const char *string, config_line_t **result)
{
  config_line_t *list = NULL, **next;
  char *k, *v;

  next = &list;
  do {
    string = parse_config_line_from_str(string, &k, &v);
    if (!string) {
      config_free_lines(list);
      return -1;
    }
    if (k && v) {
      /* This list can get long, so we keep a pointer to the end of it
       * rather than using config_line_append over and over and getting
       * n^2 performance. */
      *next = tor_malloc(sizeof(config_line_t));
      (*next)->key = k;
      (*next)->value = v;
      (*next)->next = NULL;
      next = &((*next)->next);
    } else {
      tor_free(k);
      tor_free(v);
    }
  } while (*string);

  *result = list;
  return 0;
}

/**
 * Free all the configuration lines on the linked list <b>front</b>.
 */
void
config_free_lines(config_line_t *front)
{
  config_line_t *tmp;

  while (front) {
    tmp = front;
    front = tmp->next;

    tor_free(tmp->key);
    tor_free(tmp->value);
    tor_free(tmp);
  }
}

/** Return the description for a given configuration variable, or NULL if no
 * description exists. */
static const char *
config_find_description(config_format_t *fmt, const char *name)
{
  int i;
  for (i=0; fmt->descriptions[i].name; ++i) {
    if (!strcasecmp(name, fmt->descriptions[i].name))
      return fmt->descriptions[i].description;
  }
  return NULL;
}

/** If <b>key</b> is a configuration option, return the corresponding
 * config_var_t.  Otherwise, if <b>key</b> is a non-standard abbreviation,
 * warn, and return the corresponding config_var_t.  Otherwise return NULL.
 */
static config_var_t *
config_find_option(config_format_t *fmt, const char *key)
{
  int i;
  size_t keylen = strlen(key);
  if (!keylen)
    return NULL; /* if they say "--" on the commandline, it's not an option */
  /* First, check for an exact (case-insensitive) match */
  for (i=0; fmt->vars[i].name; ++i) {
    if (!strcasecmp(key, fmt->vars[i].name)) {
      return &fmt->vars[i];
    }
  }
  /* If none, check for an abbreviated match */
  for (i=0; fmt->vars[i].name; ++i) {
    if (!strncasecmp(key, fmt->vars[i].name, keylen)) {
      log_warn(LD_CONFIG, "The abbreviation '%s' is deprecated. "
               "Please use '%s' instead",
               key, fmt->vars[i].name);
      return &fmt->vars[i];
    }
  }
  /* Okay, unrecognized option */
  return NULL;
}

/*
 * Functions to assign config options.
 */

/** <b>c</b>-\>key is known to be a real key. Update <b>options</b>
 * with <b>c</b>-\>value and return 0, or return -1 if bad value.
 *
 * Called from config_assign_line() and option_reset().
 */
static int
config_assign_value(config_format_t *fmt, or_options_t *options,
                    config_line_t *c, char **msg)
{
  int i, r, ok;
  char buf[1024];
  config_var_t *var;
  void *lvalue;

  CHECK(fmt, options);

  var = config_find_option(fmt, c->key);
  tor_assert(var);

  lvalue = STRUCT_VAR_P(options, var->var_offset);

  switch (var->type) {

  case CONFIG_TYPE_UINT:
    i = (int)tor_parse_long(c->value, 10, 0, INT_MAX, &ok, NULL);
    if (!ok) {
      r = tor_snprintf(buf, sizeof(buf),
          "Int keyword '%s %s' is malformed or out of bounds.",
          c->key, c->value);
      *msg = tor_strdup(r >= 0 ? buf : "internal error");
      return -1;
    }
    *(int *)lvalue = i;
    break;

  case CONFIG_TYPE_INTERVAL: {
    i = config_parse_interval(c->value, &ok);
    if (!ok) {
      r = tor_snprintf(buf, sizeof(buf),
          "Interval '%s %s' is malformed or out of bounds.",
          c->key, c->value);
      *msg = tor_strdup(r >= 0 ? buf : "internal error");
      return -1;
    }
    *(int *)lvalue = i;
    break;
  }

  case CONFIG_TYPE_MEMUNIT: {
    uint64_t u64 = config_parse_memunit(c->value, &ok);
    if (!ok) {
      r = tor_snprintf(buf, sizeof(buf),
          "Value '%s %s' is malformed or out of bounds.",
          c->key, c->value);
      *msg = tor_strdup(r >= 0 ? buf : "internal error");
      return -1;
    }
    *(uint64_t *)lvalue = u64;
    break;
  }

  case CONFIG_TYPE_BOOL:
    i = (int)tor_parse_long(c->value, 10, 0, 1, &ok, NULL);
    if (!ok) {
      r = tor_snprintf(buf, sizeof(buf),
          "Boolean '%s %s' expects 0 or 1.",
          c->key, c->value);
      *msg = tor_strdup(r >= 0 ? buf : "internal error");
      return -1;
    }
    *(int *)lvalue = i;
    break;

  case CONFIG_TYPE_STRING:
    tor_free(*(char **)lvalue);
    *(char **)lvalue = tor_strdup(c->value);
    break;

  case CONFIG_TYPE_DOUBLE:
    *(double *)lvalue = atof(c->value);
    break;

  case CONFIG_TYPE_ISOTIME:
    if (parse_iso_time(c->value, (time_t *)lvalue)) {
      r = tor_snprintf(buf, sizeof(buf),
          "Invalid time '%s' for keyword '%s'", c->value, c->key);
      *msg = tor_strdup(r >= 0 ? buf : "internal error");
      return -1;
    }
    break;

  case CONFIG_TYPE_CSV:
    if (*(smartlist_t**)lvalue) {
      SMARTLIST_FOREACH(*(smartlist_t**)lvalue, char *, cp, tor_free(cp));
      smartlist_clear(*(smartlist_t**)lvalue);
    } else {
      *(smartlist_t**)lvalue = smartlist_create();
    }

    smartlist_split_string(*(smartlist_t**)lvalue, c->value, ",",
                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
    break;

  case CONFIG_TYPE_LINELIST:
  case CONFIG_TYPE_LINELIST_S:
    config_line_append((config_line_t**)lvalue, c->key, c->value);
    break;

  case CONFIG_TYPE_OBSOLETE:
    log_warn(LD_CONFIG, "Skipping obsolete configuration option '%s'", c->key);
    break;
  case CONFIG_TYPE_LINELIST_V:
    r = tor_snprintf(buf, sizeof(buf),
        "You may not provide a value for virtual option '%s'", c->key);
    *msg = tor_strdup(r >= 0 ? buf : "internal error");
    return -1;
  default:
    tor_assert(0);
    break;
  }
  return 0;
}

/** If <b>c</b> is a syntactically valid configuration line, update
 * <b>options</b> with its value and return 0.  Otherwise return -1 for bad
 * key, -2 for bad value.
 *
 * If <b>clear_first</b> is set, clear the value first. Then if
 * <b>use_defaults</b> is set, set the value to the default.
 *
 * Called from config_assign().
 */
static int
config_assign_line(config_format_t *fmt, or_options_t *options,
                   config_line_t *c, int use_defaults,
                   int clear_first, char **msg)
{
  config_var_t *var;

  CHECK(fmt, options);

  var = config_find_option(fmt, c->key);
  if (!var) {
    if (fmt->extra) {
      void *lvalue = STRUCT_VAR_P(options, fmt->extra->var_offset);
      log_info(LD_CONFIG,
               "Found unrecognized option '%s'; saving it.", c->key);
      config_line_append((config_line_t**)lvalue, c->key, c->value);
      return 0;
    } else {
      char buf[1024];
      int tmp = tor_snprintf(buf, sizeof(buf),
                "Unknown option '%s'.  Failing.", c->key);
      *msg = tor_strdup(tmp >= 0 ? buf : "internal error");
      return -1;
    }
  }
  /* Put keyword into canonical case. */
  if (strcmp(var->name, c->key)) {
    tor_free(c->key);
    c->key = tor_strdup(var->name);
  }

  if (!strlen(c->value)) {
    /* reset or clear it, then return */
    if (!clear_first) {
      if (var->type == CONFIG_TYPE_LINELIST ||