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tor/src/or/confparse.c
Taylor Yu 5494087ed7 Delete useless checks in confparse.c 
config_parse_interval() and config_parse_msec_interval() were checking
whether the variable "ok" (a pointer to an int) was null, rather than
derefencing it.  Both functions are static, and all existing callers
pass a valid pointer to those static functions.  The callers do check
the variables (also confusingly named "ok") whose addresses they pass
as the "ok" arguments, so even if the pointer check were corrected to
be a dereference, it would be redundant.

Fixes #22103.
2017-05-02 16:12:30 -04:00

1218 lines
35 KiB
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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file confparse.c
*
* \brief Back-end for parsing and generating key-value files, used to
* implement the torrc file format and the state file.
*
* This module is used by config.c to parse and encode torrc
* configuration files, and by statefile.c to parse and encode the
* $DATADIR/state file.
*
* To use this module, its callers provide an instance of
* config_format_t to describe the mappings from a set of configuration
* options to a number of fields in a C structure. With this mapping,
* the functions here can convert back and forth between the C structure
* specified, and a linked list of key-value pairs.
*/
#include "or.h"
#include "confparse.h"
#include "routerset.h"
static uint64_t config_parse_memunit(const char *s, int *ok);
static int config_parse_msec_interval(const char *s, int *ok);
static int config_parse_interval(const char *s, int *ok);
static void config_reset(const config_format_t *fmt, void *options,
const config_var_t *var, int use_defaults);
/** Allocate an empty configuration object of a given format type. */
void *
config_new(const config_format_t *fmt)
{
void *opts = tor_malloc_zero(fmt->size);
*(uint32_t*)STRUCT_VAR_P(opts, fmt->magic_offset) = fmt->magic;
CONFIG_CHECK(fmt, opts);
return opts;
}
/*
* Functions to parse config options
*/
/** If <b>option</b> is an official abbreviation for a longer option,
* return the longer option. Otherwise return <b>option</b>.
* If <b>command_line</b> is set, apply all abbreviations. Otherwise, only
* apply abbreviations that work for the config file and the command line.
* If <b>warn_obsolete</b> is set, warn about deprecated names. */
const char *
config_expand_abbrev(const config_format_t *fmt, const char *option,
int command_line, int warn_obsolete)
{
int i;
if (! fmt->abbrevs)
return option;
for (i=0; fmt->abbrevs[i].abbreviated; ++i) {
/* Abbreviations are case insensitive. */
if (!strcasecmp(option,fmt->abbrevs[i].abbreviated) &&
(command_line || !fmt->abbrevs[i].commandline_only)) {
if (warn_obsolete && fmt->abbrevs[i].warn) {
log_warn(LD_CONFIG,
"The configuration option '%s' is deprecated; "
"use '%s' instead.",
fmt->abbrevs[i].abbreviated,
fmt->abbrevs[i].full);
}
/* Keep going through the list in case we want to rewrite it more.
* (We could imagine recursing here, but I don't want to get the
* user into an infinite loop if we craft our list wrong.) */
option = fmt->abbrevs[i].full;
}
}
return option;
}
/** If <b>key</b> is a deprecated configuration option, return the message
* explaining why it is deprecated (which may be an empty string). Return NULL
* if it is not deprecated. The <b>key</b> field must be fully expanded. */
const char *
config_find_deprecation(const config_format_t *fmt, const char *key)
{
if (BUG(fmt == NULL) || BUG(key == NULL))
return NULL;
if (fmt->deprecations == NULL)
return NULL;
const config_deprecation_t *d;
for (d = fmt->deprecations; d->name; ++d) {
if (!strcasecmp(d->name, key)) {
return d->why_deprecated ? d->why_deprecated : "";
}
}
return NULL;
}
/** As config_find_option, but return a non-const pointer. */
config_var_t *
config_find_option_mutable(config_format_t *fmt, const char *key)
{
int i;
size_t keylen = strlen(key);
if (!keylen)
return NULL; /* if they say "--" on the command line, 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;
}
/** If <b>key</b> is a configuration option, return the corresponding const
* config_var_t. Otherwise, if <b>key</b> is a non-standard abbreviation,
* warn, and return the corresponding const config_var_t. Otherwise return
* NULL.
*/
const config_var_t *
config_find_option(const config_format_t *fmt, const char *key)
{
return config_find_option_mutable((config_format_t*)fmt, key);
}
/** Return the number of option entries in <b>fmt</b>. */
static int
config_count_options(const config_format_t *fmt)
{
int i;
for (i=0; fmt->vars[i].name; ++i)
;
return i;
}
/*
* 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(const config_format_t *fmt, void *options,
config_line_t *c, char **msg)
{
int i, ok;
const config_var_t *var;
void *lvalue;
int *csv_int;
smartlist_t *csv_str;
CONFIG_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_PORT:
if (!strcasecmp(c->value, "auto")) {
*(int *)lvalue = CFG_AUTO_PORT;
break;
}
/* fall through */
case CONFIG_TYPE_INT:
case CONFIG_TYPE_UINT:
i = (int)tor_parse_long(c->value, 10,
var->type==CONFIG_TYPE_INT ? INT_MIN : 0,
var->type==CONFIG_TYPE_PORT ? 65535 : INT_MAX,
&ok, NULL);
if (!ok) {
tor_asprintf(msg,
"Int keyword '%s %s' is malformed or out of bounds.",
c->key, c->value);
return -1;
}
*(int *)lvalue = i;
break;
case CONFIG_TYPE_INTERVAL: {
i = config_parse_interval(c->value, &ok);
if (!ok) {
tor_asprintf(msg,
"Interval '%s %s' is malformed or out of bounds.",
c->key, c->value);
return -1;
}
*(int *)lvalue = i;
break;
}
case CONFIG_TYPE_MSEC_INTERVAL: {
i = config_parse_msec_interval(c->value, &ok);
if (!ok) {
tor_asprintf(msg,
"Msec interval '%s %s' is malformed or out of bounds.",
c->key, c->value);
return -1;
}
*(int *)lvalue = i;
break;
}
case CONFIG_TYPE_MEMUNIT: {
uint64_t u64 = config_parse_memunit(c->value, &ok);
if (!ok) {
tor_asprintf(msg,
"Value '%s %s' is malformed or out of bounds.",
c->key, c->value);
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) {
tor_asprintf(msg,
"Boolean '%s %s' expects 0 or 1.",
c->key, c->value);
return -1;
}
*(int *)lvalue = i;
break;
case CONFIG_TYPE_AUTOBOOL:
if (!strcmp(c->value, "auto"))
*(int *)lvalue = -1;
else if (!strcmp(c->value, "0"))
*(int *)lvalue = 0;
else if (!strcmp(c->value, "1"))
*(int *)lvalue = 1;
else {
tor_asprintf(msg, "Boolean '%s %s' expects 0, 1, or 'auto'.",
c->key, c->value);
return -1;
}
break;
case CONFIG_TYPE_STRING:
case CONFIG_TYPE_FILENAME:
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)) {
tor_asprintf(msg,
"Invalid time '%s' for keyword '%s'", c->value, c->key);
return -1;
}
break;
case CONFIG_TYPE_ROUTERSET:
if (*(routerset_t**)lvalue) {
routerset_free(*(routerset_t**)lvalue);
}
*(routerset_t**)lvalue = routerset_new();
if (routerset_parse(*(routerset_t**)lvalue, c->value, c->key)<0) {
tor_asprintf(msg, "Invalid exit list '%s' for option '%s'",
c->value, c->key);
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_new();
}
smartlist_split_string(*(smartlist_t**)lvalue, c->value, ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
break;
case CONFIG_TYPE_CSV_INTERVAL:
if (*(smartlist_t**)lvalue) {
SMARTLIST_FOREACH(*(smartlist_t**)lvalue, int *, cp, tor_free(cp));
smartlist_clear(*(smartlist_t**)lvalue);
} else {
*(smartlist_t**)lvalue = smartlist_new();
}
csv_str = smartlist_new();
smartlist_split_string(csv_str, c->value, ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
SMARTLIST_FOREACH_BEGIN(csv_str, char *, str)
{
i = config_parse_interval(str, &ok);
if (!ok) {
tor_asprintf(msg,
"Interval in '%s %s' is malformed or out of bounds.",
c->key, c->value);
SMARTLIST_FOREACH(csv_str, char *, cp, tor_free(cp));
smartlist_free(csv_str);
return -1;
}
csv_int = tor_malloc_zero(sizeof(int));
*csv_int = i;
smartlist_add(*(smartlist_t**)lvalue, csv_int);
}
SMARTLIST_FOREACH_END(str);
SMARTLIST_FOREACH(csv_str, char *, cp, tor_free(cp));
smartlist_free(csv_str);
break;
case CONFIG_TYPE_LINELIST:
case CONFIG_TYPE_LINELIST_S:
{
config_line_t *lastval = *(config_line_t**)lvalue;
if (lastval && lastval->fragile) {
if (c->command != CONFIG_LINE_APPEND) {
config_free_lines(lastval);
*(config_line_t**)lvalue = NULL;
} else {
lastval->fragile = 0;
}
}
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:
tor_asprintf(msg,
"You may not provide a value for virtual option '%s'", c->key);
return -1;
default:
tor_assert(0);
break;
}
return 0;
}
/** Mark every linelist in <b>options</b> "fragile", so that fresh assignments
* to it will replace old ones. */
static void
config_mark_lists_fragile(const config_format_t *fmt, void *options)
{
int i;
tor_assert(fmt);
tor_assert(options);
for (i = 0; fmt->vars[i].name; ++i) {
const config_var_t *var = &fmt->vars[i];
config_line_t *list;
if (var->type != CONFIG_TYPE_LINELIST &&
var->type != CONFIG_TYPE_LINELIST_V)
continue;
list = *(config_line_t **)STRUCT_VAR_P(options, var->var_offset);
if (list)
list->fragile = 1;
}
}
void
warn_deprecated_option(const char *what, const char *why)
{
const char *space = (why && strlen(why)) ? " " : "";
log_warn(LD_CONFIG, "The %s option is deprecated, and will most likely "
"be removed in a future version of Tor.%s%s (If you think this is "
"a mistake, please let us know!)",
what, space, why);
}
/** 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(const config_format_t *fmt, void *options,
config_line_t *c, unsigned flags,
bitarray_t *options_seen, char **msg)
{
const unsigned use_defaults = flags & CAL_USE_DEFAULTS;
const unsigned clear_first = flags & CAL_CLEAR_FIRST;
const unsigned warn_deprecations = flags & CAL_WARN_DEPRECATIONS;
const config_var_t *var;
CONFIG_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 {
tor_asprintf(msg,
"Unknown option '%s'. Failing.", c->key);
return -1;
}
}
/* Put keyword into canonical case. */
if (strcmp(var->name, c->key)) {
tor_free(c->key);
c->key = tor_strdup(var->name);
}
const char *deprecation_msg;
if (warn_deprecations &&
(deprecation_msg = config_find_deprecation(fmt, var->name))) {
warn_deprecated_option(var->name, deprecation_msg);
}
if (!strlen(c->value)) {
/* reset or clear it, then return */
if (!clear_first) {
if ((var->type == CONFIG_TYPE_LINELIST ||
var->type == CONFIG_TYPE_LINELIST_S) &&
c->command != CONFIG_LINE_CLEAR) {
/* We got an empty linelist from the torrc or command line.
As a special case, call this an error. Warn and ignore. */
log_warn(LD_CONFIG,
"Linelist option '%s' has no value. Skipping.", c->key);
} else { /* not already cleared */
config_reset(fmt, options, var, use_defaults);
}
}
return 0;
} else if (c->command == CONFIG_LINE_CLEAR && !clear_first) {
config_reset(fmt, options, var, use_defaults);
}
if (options_seen && (var->type != CONFIG_TYPE_LINELIST &&
var->type != CONFIG_TYPE_LINELIST_S)) {
/* We're tracking which options we've seen, and this option is not
* supposed to occur more than once. */
int var_index = (int)(var - fmt->vars);
if (bitarray_is_set(options_seen, var_index)) {
log_warn(LD_CONFIG, "Option '%s' used more than once; all but the last "
"value will be ignored.", var->name);
}
bitarray_set(options_seen, var_index);
}
if (config_assign_value(fmt, options, c, msg) < 0)
return -2;
return 0;
}
/** Restore the option named <b>key</b> in options to its default value.
* Called from config_assign(). */
static void
config_reset_line(const config_format_t *fmt, void *options,
const char *key, int use_defaults)
{
const config_var_t *var;
CONFIG_CHECK(fmt, options);
var = config_find_option(fmt, key);
if (!var)
return; /* give error on next pass. */
config_reset(fmt, options, var, use_defaults);
}
/** Return true iff value needs to be quoted and escaped to be used in
* a configuration file. */
static int
config_value_needs_escape(const char *value)
{
if (*value == '\"')
return 1;
while (*value) {
switch (*value)
{
case '\r':
case '\n':
case '#':
/* Note: quotes and backspaces need special handling when we are using
* quotes, not otherwise, so they don't trigger escaping on their
* own. */
return 1;
default:
if (!TOR_ISPRINT(*value))
return 1;
}
++value;
}
return 0;
}
/** Return newly allocated line or lines corresponding to <b>key</b> in the
* configuration <b>options</b>. If <b>escape_val</b> is true and a
* value needs to be quoted before it's put in a config file, quote and
* escape that value. Return NULL if no such key exists. */
config_line_t *
config_get_assigned_option(const config_format_t *fmt, const void *options,
const char *key, int escape_val)
{
const config_var_t *var;
const void *value;
config_line_t *result;
smartlist_t *csv_str;
tor_assert(options && key);
CONFIG_CHECK(fmt, options);
var = config_find_option(fmt, key);
if (!var) {
log_warn(LD_CONFIG, "Unknown option '%s'. Failing.", key);
return NULL;
}
value = STRUCT_VAR_P(options, var->var_offset);
result = tor_malloc_zero(sizeof(config_line_t));
result->key = tor_strdup(var->name);
switch (var->type)
{
case CONFIG_TYPE_STRING:
case CONFIG_TYPE_FILENAME:
if (*(char**)value) {
result->value = tor_strdup(*(char**)value);
} else {
tor_free(result->key);
tor_free(result);
return NULL;
}
break;
case CONFIG_TYPE_ISOTIME:
if (*(time_t*)value) {
result->value = tor_malloc(ISO_TIME_LEN+1);
format_iso_time(result->value, *(time_t*)value);
} else {
tor_free(result->key);
tor_free(result);
}
escape_val = 0; /* Can't need escape. */
break;
case CONFIG_TYPE_PORT:
if (*(int*)value == CFG_AUTO_PORT) {
result->value = tor_strdup("auto");
escape_val = 0;
break;
}
/* fall through */
case CONFIG_TYPE_INTERVAL:
case CONFIG_TYPE_MSEC_INTERVAL:
case CONFIG_TYPE_UINT:
case CONFIG_TYPE_INT:
/* This means every or_options_t uint or bool element
* needs to be an int. Not, say, a uint16_t or char. */
tor_asprintf(&result->value, "%d", *(int*)value);
escape_val = 0; /* Can't need escape. */
break;
case CONFIG_TYPE_MEMUNIT:
tor_asprintf(&result->value, U64_FORMAT,
U64_PRINTF_ARG(*(uint64_t*)value));
escape_val = 0; /* Can't need escape. */
break;
case CONFIG_TYPE_DOUBLE:
tor_asprintf(&result->value, "%f", *(double*)value);
escape_val = 0; /* Can't need escape. */
break;
case CONFIG_TYPE_AUTOBOOL:
if (*(int*)value == -1) {
result->value = tor_strdup("auto");
escape_val = 0;
break;
}
/* fall through */
case CONFIG_TYPE_BOOL:
result->value = tor_strdup(*(int*)value ? "1" : "0");
escape_val = 0; /* Can't need escape. */
break;
case CONFIG_TYPE_ROUTERSET:
result->value = routerset_to_string(*(routerset_t**)value);
break;
case CONFIG_TYPE_CSV:
if (*(smartlist_t**)value)
result->value =
smartlist_join_strings(*(smartlist_t**)value, ",", 0, NULL);
else
result->value = tor_strdup("");
break;
case CONFIG_TYPE_CSV_INTERVAL:
if (*(smartlist_t**)value) {
csv_str = smartlist_new();
SMARTLIST_FOREACH_BEGIN(*(smartlist_t**)value, int *, i)
{
smartlist_add_asprintf(csv_str, "%d", *i);
}
SMARTLIST_FOREACH_END(i);
result->value = smartlist_join_strings(csv_str, ",", 0, NULL);
SMARTLIST_FOREACH(csv_str, char *, cp, tor_free(cp));
smartlist_free(csv_str);
} else
result->value = tor_strdup("");
break;
case CONFIG_TYPE_OBSOLETE:
log_fn(LOG_INFO, LD_CONFIG,
"You asked me for the value of an obsolete config option '%s'.",
key);
tor_free(result->key);
tor_free(result);
return NULL;
case CONFIG_TYPE_LINELIST_S:
tor_free(result->key);
tor_free(result);
result = config_lines_dup_and_filter(*(const config_line_t **)value,
key);
break;
case CONFIG_TYPE_LINELIST:
case CONFIG_TYPE_LINELIST_V:
tor_free(result->key);
tor_free(result);
result = config_lines_dup(*(const config_line_t**)value);
break;
default:
tor_free(result->key);
tor_free(result);
log_warn(LD_BUG,"Unknown type %d for known key '%s'",
var->type, key);
return NULL;
}
if (escape_val) {
config_line_t *line;
for (line = result; line; line = line->next) {
if (line->value && config_value_needs_escape(line->value)) {
char *newval = esc_for_log(line->value);
tor_free(line->value);
line->value = newval;
}
}
}
return result;
}
/** Iterate through the linked list of requested options <b>list</b>.
* For each item, convert as appropriate and assign to <b>options</b>.
* If an item is unrecognized, set *msg and return -1 immediately,
* else return 0 for success.
*
* If <b>clear_first</b>, interpret config options as replacing (not
* extending) their previous values. If <b>clear_first</b> is set,
* then <b>use_defaults</b> to decide if you set to defaults after
* clearing, or make the value 0 or NULL.
*
* Here are the use cases:
* 1. A non-empty AllowInvalid line in your torrc. Appends to current
* if linelist, replaces current if csv.
* 2. An empty AllowInvalid line in your torrc. Should clear it.
* 3. "RESETCONF AllowInvalid" sets it to default.
* 4. "SETCONF AllowInvalid" makes it NULL.
* 5. "SETCONF AllowInvalid=foo" clears it and sets it to "foo".
*
* Use_defaults Clear_first
* 0 0 "append"
* 1 0 undefined, don't use
* 0 1 "set to null first"
* 1 1 "set to defaults first"
* Return 0 on success, -1 on bad key, -2 on bad value.
*
* As an additional special case, if a LINELIST config option has
* no value and clear_first is 0, then warn and ignore it.
*/
/*
There are three call cases for config_assign() currently.
Case one: Torrc entry
options_init_from_torrc() calls config_assign(0, 0)
calls config_assign_line(0, 0).
if value is empty, calls config_reset(0) and returns.
calls config_assign_value(), appends.
Case two: setconf
options_trial_assign() calls config_assign(0, 1)
calls config_reset_line(0)
calls config_reset(0)
calls option_clear().
calls config_assign_line(0, 1).
if value is empty, returns.
calls config_assign_value(), appends.
Case three: resetconf
options_trial_assign() calls config_assign(1, 1)
calls config_reset_line(1)
calls config_reset(1)
calls option_clear().
calls config_assign_value(default)
calls config_assign_line(1, 1).
returns.
*/
int
config_assign(const config_format_t *fmt, void *options, config_line_t *list,
unsigned config_assign_flags, char **msg)
{
config_line_t *p;
bitarray_t *options_seen;
const int n_options = config_count_options(fmt);
const unsigned clear_first = config_assign_flags & CAL_CLEAR_FIRST;
const unsigned use_defaults = config_assign_flags & CAL_USE_DEFAULTS;
CONFIG_CHECK(fmt, options);
/* pass 1: normalize keys */
for (p = list; p; p = p->next) {
const char *full = config_expand_abbrev(fmt, p->key, 0, 1);
if (strcmp(full,p->key)) {
tor_free(p->key);
p->key = tor_strdup(full);
}
}
/* pass 2: if we're reading from a resetting source, clear all
* mentioned config options, and maybe set to their defaults. */
if (clear_first) {
for (p = list; p; p = p->next)
config_reset_line(fmt, options, p->key, use_defaults);
}
options_seen = bitarray_init_zero(n_options);
/* pass 3: assign. */
while (list) {
int r;
if ((r=config_assign_line(fmt, options, list, config_assign_flags,
options_seen, msg))) {
bitarray_free(options_seen);
return r;
}
list = list->next;
}
bitarray_free(options_seen);
/** Now we're done assigning a group of options to the configuration.
* Subsequent group assignments should _replace_ linelists, not extend
* them. */
config_mark_lists_fragile(fmt, options);
return 0;
}
/** Reset config option <b>var</b> to 0, 0.0, NULL, or the equivalent.
* Called from config_reset() and config_free(). */
static void
config_clear(const config_format_t *fmt, void *options,
const config_var_t *var)
{
void *lvalue = STRUCT_VAR_P(options, var->var_offset);
(void)fmt; /* unused */
switch (var->type) {
case CONFIG_TYPE_STRING:
case CONFIG_TYPE_FILENAME:
tor_free(*(char**)lvalue);
break;
case CONFIG_TYPE_DOUBLE:
*(double*)lvalue = 0.0;
break;
case CONFIG_TYPE_ISOTIME:
*(time_t*)lvalue = 0;
break;
case CONFIG_TYPE_INTERVAL:
case CONFIG_TYPE_MSEC_INTERVAL:
case CONFIG_TYPE_UINT:
case CONFIG_TYPE_INT:
case CONFIG_TYPE_PORT:
case CONFIG_TYPE_BOOL:
*(int*)lvalue = 0;
break;
case CONFIG_TYPE_AUTOBOOL:
*(int*)lvalue = -1;
break;
case CONFIG_TYPE_MEMUNIT:
*(uint64_t*)lvalue = 0;
break;
case CONFIG_TYPE_ROUTERSET:
if (*(routerset_t**)lvalue) {
routerset_free(*(routerset_t**)lvalue);
*(routerset_t**)lvalue = NULL;
}
break;
case CONFIG_TYPE_CSV:
if (*(smartlist_t**)lvalue) {
SMARTLIST_FOREACH(*(smartlist_t **)lvalue, char *, cp, tor_free(cp));
smartlist_free(*(smartlist_t **)lvalue);
*(smartlist_t **)lvalue = NULL;
}
break;
case CONFIG_TYPE_CSV_INTERVAL:
if (*(smartlist_t**)lvalue) {
SMARTLIST_FOREACH(*(smartlist_t **)lvalue, int *, cp, tor_free(cp));
smartlist_free(*(smartlist_t **)lvalue);
*(smartlist_t **)lvalue = NULL;
}
break;
case CONFIG_TYPE_LINELIST:
case CONFIG_TYPE_LINELIST_S:
config_free_lines(*(config_line_t **)lvalue);
*(config_line_t **)lvalue = NULL;
break;
case CONFIG_TYPE_LINELIST_V:
/* handled by linelist_s. */
break;
case CONFIG_TYPE_OBSOLETE:
break;
}
}
/** Clear the option indexed by <b>var</b> in <b>options</b>. Then if
* <b>use_defaults</b>, set it to its default value.
* Called by config_init() and option_reset_line() and option_assign_line(). */
static void
config_reset(const config_format_t *fmt, void *options,
const config_var_t *var, int use_defaults)
{
config_line_t *c;
char *msg = NULL;
CONFIG_CHECK(fmt, options);
config_clear(fmt, options, var); /* clear it first */
if (!use_defaults)
return; /* all done */
if (var->initvalue) {
c = tor_malloc_zero(sizeof(config_line_t));
c->key = tor_strdup(var->name);
c->value = tor_strdup(var->initvalue);
if (config_assign_value(fmt, options, c, &msg) < 0) {
log_warn(LD_BUG, "Failed to assign default: %s", msg);
tor_free(msg); /* if this happens it's a bug */
}
config_free_lines(c);
}
}
/** Release storage held by <b>options</b>. */
void
config_free(const config_format_t *fmt, void *options)
{
int i;
if (!options)
return;
tor_assert(fmt);
for (i=0; fmt->vars[i].name; ++i)
config_clear(fmt, options, &(fmt->vars[i]));
if (fmt->extra) {
config_line_t **linep = STRUCT_VAR_P(options, fmt->extra->var_offset);
config_free_lines(*linep);
*linep = NULL;
}
tor_free(options);
}
/** Return true iff the option <b>name</b> has the same value in <b>o1</b>
* and <b>o2</b>. Must not be called for LINELIST_S or OBSOLETE options.
*/
int
config_is_same(const config_format_t *fmt,
const void *o1, const void *o2,
const char *name)
{
config_line_t *c1, *c2;
int r = 1;
CONFIG_CHECK(fmt, o1);
CONFIG_CHECK(fmt, o2);
c1 = config_get_assigned_option(fmt, o1, name, 0);
c2 = config_get_assigned_option(fmt, o2, name, 0);
r = config_lines_eq(c1, c2);
config_free_lines(c1);
config_free_lines(c2);
return r;
}
/** Copy storage held by <b>old</b> into a new or_options_t and return it. */
void *
config_dup(const config_format_t *fmt, const void *old)
{
void *newopts;
int i;
config_line_t *line;
newopts = config_new(fmt);
for (i=0; fmt->vars[i].name; ++i) {
if (fmt->vars[i].type == CONFIG_TYPE_LINELIST_S)
continue;
if (fmt->vars[i].type == CONFIG_TYPE_OBSOLETE)
continue;
line = config_get_assigned_option(fmt, old, fmt->vars[i].name, 0);
if (line) {
char *msg = NULL;
if (config_assign(fmt, newopts, line, 0, &msg) < 0) {
log_err(LD_BUG, "config_get_assigned_option() generated "
"something we couldn't config_assign(): %s", msg);
tor_free(msg);
tor_assert(0);
}
}
config_free_lines(line);
}
return newopts;
}
/** Set all vars in the configuration object <b>options</b> to their default
* values. */
void
config_init(const config_format_t *fmt, void *options)
{
int i;
const config_var_t *var;
CONFIG_CHECK(fmt, options);
for (i=0; fmt->vars[i].name; ++i) {
var = &fmt->vars[i];
if (!var->initvalue)
continue; /* defaults to NULL or 0 */
config_reset(fmt, options, var, 1);
}
}
/** Allocate and return a new string holding the written-out values of the vars
* in 'options'. If 'minimal', do not write out any default-valued vars.
* Else, if comment_defaults, write default values as comments.
*/
char *
config_dump(const config_format_t *fmt, const void *default_options,
const void *options, int minimal,
int comment_defaults)
{
smartlist_t *elements;
const void *defaults = default_options;
void *defaults_tmp = NULL;
config_line_t *line, *assigned;
char *result;
int i;
char *msg = NULL;
if (defaults == NULL) {
defaults = defaults_tmp = config_new(fmt);
config_init(fmt, defaults_tmp);
}
/* XXX use a 1 here so we don't add a new log line while dumping */
if (default_options == NULL) {
if (fmt->validate_fn(NULL, defaults_tmp, defaults_tmp, 1, &msg) < 0) {
log_err(LD_BUG, "Failed to validate default config: %s", msg);
tor_free(msg);
tor_assert(0);
}
}
elements = smartlist_new();
for (i=0; fmt->vars[i].name; ++i) {
int comment_option = 0;
if (fmt->vars[i].type == CONFIG_TYPE_OBSOLETE ||
fmt->vars[i].type == CONFIG_TYPE_LINELIST_S)
continue;
/* Don't save 'hidden' control variables. */
if (!strcmpstart(fmt->vars[i].name, "__"))
continue;
if (minimal && config_is_same(fmt, options, defaults, fmt->vars[i].name))
continue;
else if (comment_defaults &&
config_is_same(fmt, options, defaults, fmt->vars[i].name))
comment_option = 1;
line = assigned =
config_get_assigned_option(fmt, options, fmt->vars[i].name, 1);
for (; line; line = line->next) {
if (!strcmpstart(line->key, "__")) {
/* This check detects "hidden" variables inside LINELIST_V structures.
*/
continue;
}
smartlist_add_asprintf(elements, "%s%s %s\n",
comment_option ? "# " : "",
line->key, line->value);
}
config_free_lines(assigned);
}
if (fmt->extra) {
line = *(config_line_t**)STRUCT_VAR_P(options, fmt->extra->var_offset);
for (; line; line = line->next) {
smartlist_add_asprintf(elements, "%s %s\n", line->key, line->value);
}
}
result = smartlist_join_strings(elements, "", 0, NULL);
SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
smartlist_free(elements);
if (defaults_tmp)
config_free(fmt, defaults_tmp);
return result;
}
/** Mapping from a unit name to a multiplier for converting that unit into a
* base unit. Used by config_parse_unit. */
struct unit_table_t {
const char *unit; /**< The name of the unit */
uint64_t multiplier; /**< How many of the base unit appear in this unit */
};
/** Table to map the names of memory units to the number of bytes they
* contain. */
static struct unit_table_t memory_units[] = {
{ "", 1 },
{ "b", 1<< 0 },
{ "byte", 1<< 0 },
{ "bytes", 1<< 0 },
{ "kb", 1<<10 },
{ "kbyte", 1<<10 },
{ "kbytes", 1<<10 },
{ "kilobyte", 1<<10 },
{ "kilobytes", 1<<10 },
{ "kilobits", 1<<7 },
{ "kilobit", 1<<7 },
{ "kbits", 1<<7 },
{ "kbit", 1<<7 },
{ "m", 1<<20 },
{ "mb", 1<<20 },
{ "mbyte", 1<<20 },
{ "mbytes", 1<<20 },
{ "megabyte", 1<<20 },
{ "megabytes", 1<<20 },
{ "megabits", 1<<17 },
{ "megabit", 1<<17 },
{ "mbits", 1<<17 },
{ "mbit", 1<<17 },
{ "gb", 1<<30 },
{ "gbyte", 1<<30 },
{ "gbytes", 1<<30 },
{ "gigabyte", 1<<30 },
{ "gigabytes", 1<<30 },
{ "gigabits", 1<<27 },
{ "gigabit", 1<<27 },
{ "gbits", 1<<27 },
{ "gbit", 1<<27 },
{ "tb", U64_LITERAL(1)<<40 },
{ "tbyte", U64_LITERAL(1)<<40 },
{ "tbytes", U64_LITERAL(1)<<40 },
{ "terabyte", U64_LITERAL(1)<<40 },
{ "terabytes", U64_LITERAL(1)<<40 },
{ "terabits", U64_LITERAL(1)<<37 },
{ "terabit", U64_LITERAL(1)<<37 },
{ "tbits", U64_LITERAL(1)<<37 },
{ "tbit", U64_LITERAL(1)<<37 },
{ NULL, 0 },
};
/** Table to map the names of time units to the number of seconds they
* contain. */
static struct unit_table_t time_units[] = {
{ "", 1 },
{ "second", 1 },
{ "seconds", 1 },
{ "minute", 60 },
{ "minutes", 60 },
{ "hour", 60*60 },
{ "hours", 60*60 },
{ "day", 24*60*60 },
{ "days", 24*60*60 },
{ "week", 7*24*60*60 },
{ "weeks", 7*24*60*60 },
{ "month", 2629728, }, /* about 30.437 days */
{ "months", 2629728, },
{ NULL, 0 },
};
/** Table to map the names of time units to the number of milliseconds
* they contain. */
static struct unit_table_t time_msec_units[] = {
{ "", 1 },
{ "msec", 1 },
{ "millisecond", 1 },
{ "milliseconds", 1 },
{ "second", 1000 },
{ "seconds", 1000 },
{ "minute", 60*1000 },
{ "minutes", 60*1000 },
{ "hour", 60*60*1000 },
{ "hours", 60*60*1000 },
{ "day", 24*60*60*1000 },
{ "days", 24*60*60*1000 },
{ "week", 7*24*60*60*1000 },
{ "weeks", 7*24*60*60*1000 },
{ NULL, 0 },
};
/** Parse a string <b>val</b> containing a number, zero or more
* spaces, and an optional unit string. If the unit appears in the
* table <b>u</b>, then multiply the number by the unit multiplier.
* On success, set *<b>ok</b> to 1 and return this product.
* Otherwise, set *<b>ok</b> to 0.
*/
static uint64_t
config_parse_units(const char *val, struct unit_table_t *u, int *ok)
{
uint64_t v = 0;
double d = 0;
int use_float = 0;
char *cp;
tor_assert(ok);
v = tor_parse_uint64(val, 10, 0, UINT64_MAX, ok, &cp);
if (!*ok || (cp && *cp == '.')) {
d = tor_parse_double(val, 0, (double)UINT64_MAX, ok, &cp);
if (!*ok)
goto done;
use_float = 1;
}
if (!cp) {
*ok = 1;
v = use_float ? DBL_TO_U64(d) : v;
goto done;
}
cp = (char*) eat_whitespace(cp);
for ( ;u->unit;++u) {
if (!strcasecmp(u->unit, cp)) {
if (use_float)
v = (uint64_t)(u->multiplier * d);
else
v *= u->multiplier;
*ok = 1;
goto done;
}
}
log_warn(LD_CONFIG, "Unknown unit '%s'.", cp);
*ok = 0;
done:
if (*ok)
return v;
else
return 0;
}
/** Parse a string in the format "number unit", where unit is a unit of
* information (byte, KB, M, etc). On success, set *<b>ok</b> to true
* and return the number of bytes specified. Otherwise, set
* *<b>ok</b> to false and return 0. */
static uint64_t
config_parse_memunit(const char *s, int *ok)
{
uint64_t u = config_parse_units(s, memory_units, ok);
return u;
}
/** Parse a string in the format "number unit", where unit is a unit of
* time in milliseconds. On success, set *<b>ok</b> to true and return
* the number of milliseconds in the provided interval. Otherwise, set
* *<b>ok</b> to 0 and return -1. */
static int
config_parse_msec_interval(const char *s, int *ok)
{
uint64_t r;
r = config_parse_units(s, time_msec_units, ok);
if (r > INT_MAX) {
log_warn(LD_CONFIG, "Msec interval '%s' is too long", s);
*ok = 0;
return -1;
}
return (int)r;
}
/** Parse a string in the format "number unit", where unit is a unit of time.
* On success, set *<b>ok</b> to true and return the number of seconds in
* the provided interval. Otherwise, set *<b>ok</b> to 0 and return -1.
*/
static int
config_parse_interval(const char *s, int *ok)
{
uint64_t r;
r = config_parse_units(s, time_units, ok);
if (r > INT_MAX) {
log_warn(LD_CONFIG, "Interval '%s' is too long", s);
*ok = 0;
return -1;
}
return (int)r;
}
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