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tor/src/or/confparse.c

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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) 2007-2016, 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;
}
/** Helper: allocate a new configuration option mapping 'key' to 'val',
* append it to *<b>lst</b>. */
void
config_line_append(config_line_t **lst,
const char *key,
const char *val)
{
config_line_t *newline;
newline = tor_malloc_zero(sizeof(config_line_t));
newline->key = tor_strdup(key);
newline->value = tor_strdup(val);
newline->next = NULL;
while (*lst)
lst = &((*lst)->next);
(*lst) = newline;
}
/** Return the line in <b>lines</b> whose key is exactly <b>key</b>, or NULL
* if no such key exists. For handling commandline-only options only; other
* options should be looked up in the appropriate data structure. */
const config_line_t *
config_line_find(const config_line_t *lines,
const char *key)
{
const config_line_t *cl;
for (cl = lines; cl; cl = cl->next) {
if (!strcmp(cl->key, key))
return cl;
}
return NULL;
}
/** 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.
*
* If <b>extended</b> is set, then treat keys beginning with / and with + as
* indicating "clear" and "append" respectively. */
int
config_get_lines(const char *string, config_line_t **result, int extended)
{
config_line_t *list = NULL, **next;
char *k, *v;
const char *parse_err;
next = &list;
do {
k = v = NULL;
string = parse_config_line_from_str_verbose(string, &k, &v, &parse_err);
if (!string) {
log_warn(LD_CONFIG, "Error while parsing configuration: %s",
parse_err?parse_err:"<unknown>");
config_free_lines(list);
tor_free(k);
tor_free(v);
return -1;
}
if (k && v) {
unsigned command = CONFIG_LINE_NORMAL;
if (extended) {
if (k[0] == '+') {
char *k_new = tor_strdup(k+1);
tor_free(k);
k = k_new;
command = CONFIG_LINE_APPEND;
} else if (k[0] == '/') {
char *k_new = tor_strdup(k+1);
tor_free(k);
k = k_new;
tor_free(v);
v = tor_strdup("");
command = CONFIG_LINE_CLEAR;
}
}
/* 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_zero(sizeof(config_line_t));
(*next)->key = k;
(*next)->value = v;
(*next)->next = NULL;
(*next)->command = command;
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);
}
}
/** 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 a newly allocated deep copy of the lines in <b>inp</b>. */
config_line_t *
config_lines_dup(const config_line_t *inp)
{
config_line_t *result = NULL;
config_line_t **next_out = &result;
while (inp) {
*next_out = tor_malloc_zero(sizeof(config_line_t));
(*next_out)->key = tor_strdup(inp->key);
(*next_out)->value = tor_strdup(inp->value);
inp = inp->next;
next_out = &((*next_out)->next);
}
(*next_out) = NULL;
return result;
}
/** 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:
log_warn(LD_CONFIG,
"Can't return context-sensitive '%s' on its own", key);
tor_free(result->key);
tor_free(result);
return NULL;
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 a and b contain identical keys and values in identical
* order. */
int
config_lines_eq(config_line_t *a, config_line_t *b)
{
while (a && b) {
if (strcasecmp(a->key, b->key) || strcmp(a->value, b->value))
return 0;
a = a->next;
b = b->next;
}
if (a || b)
return 0;
return 1;
}
/** Return the number of lines in <b>a</b> whose key is <b>key</b>. */
int
config_count_key(const config_line_t *a, const char *key)
{
int n = 0;
while (a) {
if (!strcasecmp(a->key, key)) {
++n;
}
a = a->next;
}
return n;
}
/** 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) {
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 (!ok)
return -1;
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 (!ok)
return -1;
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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