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Parameterize configuration parsing functions
svn:r4635
This commit is contained in:
Nick Mathewson
parent
5621ccc962
commit
c252a76f0b
7
doc/TODO
7
doc/TODO
@ -87,14 +87,19 @@ N . Controller improvements
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o Implement main controller interface
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o Glue code
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o Testing
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N - Make configuration parsing code switchable to different sets of
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N . Make configuration parsing code switchable to different sets of
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variables so we can use it for persistence.
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o Implement
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o Add simple type-checking
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- Rename functions to distinguish configuration-only functions from
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cross-format functions
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N . helper nodes (Choose N nodes randomly; if a node dies (goes down for a
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long time), replace it. Store nodes on disk.
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o Implement (basic case)
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- Implement (persistence)
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- Document
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- Test, debug
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- On sighup, if usehelpernodes changed to 1, use new circs.
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N - Make a FirewallIPs to correspond to firewallPorts so I can use Tor at
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MIT when my directory is out of date.
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- switch accountingmax to count total in+out, not either in or
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235
src/or/config.c
235
src/or/config.c
@ -47,7 +47,7 @@ typedef struct config_abbrev_t {
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#define PLURAL(tok) { #tok, #tok "s", 0 }
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/* A list of command-line abbreviations. */
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static config_abbrev_t config_abbrevs[] = {
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static config_abbrev_t _config_abbrevs[] = {
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PLURAL(ExitNode),
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PLURAL(EntryNode),
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PLURAL(ExcludeNode),
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@ -92,7 +92,7 @@ typedef struct config_var_t {
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* abbreviations, order is significant, since the first matching option will
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* be chosen first.
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*/
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static config_var_t config_vars[] = {
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static config_var_t _config_vars[] = {
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VAR("Address", STRING, Address, NULL),
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VAR("AccountingStart", STRING, AccountingStart, NULL),
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VAR("AllowUnverifiedNodes",CSV, AllowUnverifiedNodes, "middle,rendezvous"),
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@ -187,15 +187,33 @@ static config_var_t config_vars[] = {
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#undef VAR
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#undef OBSOLETE
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typedef int (*validate_fn_t)(void*);
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typedef struct {
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size_t size;
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uint32_t magic;
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off_t magic_offset;
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config_abbrev_t *abbrevs;
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config_var_t *vars;
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validate_fn_t validate_fn;
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} config_format_t;
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#define CHECK(fmt, cfg) do { \
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tor_assert(fmt && cfg); \
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tor_assert((fmt)->magic == *(uint32_t*)(((char*)(cfg))+fmt->magic_offset)); \
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} while (0)
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/** Largest allowed config line */
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#define CONFIG_LINE_T_MAXLEN 4096
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static void config_line_append(struct config_line_t **lst,
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const char *key, const char *val);
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static void option_reset(or_options_t *options, config_var_t *var);
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static void options_free(or_options_t *options);
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static int option_is_same(or_options_t *o1, or_options_t *o2,const char *name);
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static or_options_t *options_dup(or_options_t *old);
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static void option_reset(config_format_t *fmt, or_options_t *options,
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config_var_t *var);
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static void options_free(config_format_t *fmt, or_options_t *options);
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static int option_is_same(config_format_t *fmt,
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or_options_t *o1, or_options_t *o2,const char *name);
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static or_options_t *options_dup(config_format_t *fmt, or_options_t *old);
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static int options_validate(or_options_t *options);
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static int options_transition_allowed(or_options_t *old, or_options_t *new);
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static int check_nickname_list(const char *lst, const char *name);
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@ -215,6 +233,9 @@ static int add_single_log_option(or_options_t *options, int minSeverity,
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static int normalize_log_options(or_options_t *options);
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static int validate_data_directory(or_options_t *options);
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static int write_configuration_file(const char *fname, or_options_t *options);
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static struct config_line_t *get_assigned_option(config_format_t *fmt,
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or_options_t *options, const char *key);
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static void config_init(config_format_t *fmt, or_options_t *options);
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static uint64_t config_parse_memunit(const char *s, int *ok);
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static int config_parse_interval(const char *s, int *ok);
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@ -224,6 +245,17 @@ static int init_libevent(void);
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static void check_libevent_version(const char *m, const char *v, int server);
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#endif
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#define OR_OPTIONS_MAGIC 9090909
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static config_format_t config_format = {
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sizeof(or_options_t),
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OR_OPTIONS_MAGIC,
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STRUCT_OFFSET(or_options_t, _magic),
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_config_abbrevs,
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_config_vars,
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(validate_fn_t)options_validate
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};
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/*
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* Functions to read and write the global options pointer.
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*/
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@ -233,6 +265,15 @@ static or_options_t *global_options=NULL;
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/** Name of most recently read torrc file. */
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static char *config_fname = NULL;
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static void *
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config_alloc(config_format_t *fmt)
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{
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void *opts = opts = tor_malloc_zero(fmt->size);
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*(uint32_t*)(((char*)opts)+fmt->magic_offset) = fmt->magic;
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CHECK(fmt, opts);
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return opts;
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}
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/** Return the currently configured options. */
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or_options_t *
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get_options(void)
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@ -248,14 +289,14 @@ void
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set_options(or_options_t *new_val)
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{
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if (global_options)
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options_free(global_options);
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options_free(&config_format, global_options);
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global_options = new_val;
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}
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void
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config_free_all(void)
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{
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options_free(global_options);
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options_free(&config_format, global_options);
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tor_free(config_fname);
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}
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@ -417,14 +458,16 @@ options_act(void)
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* If <b>command_line</b> is set, apply all abbreviations. Otherwise, only
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* apply abbreviations that work for the config file and the command line. */
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static const char *
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expand_abbrev(const char *option, int command_line)
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expand_abbrev(config_format_t *fmt, const char *option, int command_line)
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{
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int i;
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for (i=0; config_abbrevs[i].abbreviated; ++i) {
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if (! fmt->abbrevs)
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return option;
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for (i=0; fmt->abbrevs[i].abbreviated; ++i) {
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/* Abbreviations aren't casei. */
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if (!strcasecmp(option,config_abbrevs[i].abbreviated) &&
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(command_line || !config_abbrevs[i].commandline_only)) {
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return config_abbrevs[i].full;
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if (!strcasecmp(option,fmt->abbrevs[i].abbreviated) &&
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(command_line || !fmt->abbrevs[i].commandline_only)) {
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return fmt->abbrevs[i].full;
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}
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}
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return option;
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@ -458,7 +501,7 @@ config_get_commandlines(int argc, char **argv)
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while (*s == '-')
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s++;
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(*new)->key = tor_strdup(expand_abbrev(s, 1));
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(*new)->key = tor_strdup(expand_abbrev(&config_format, s, 1));
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(*new)->value = tor_strdup(argv[i+1]);
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(*new)->next = NULL;
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log(LOG_DEBUG,"Commandline: parsed keyword '%s', value '%s'",
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@ -545,24 +588,24 @@ config_free_lines(struct config_line_t *front)
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* warn, and return the corresponding config_var_t. Otherwise return NULL.
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*/
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static config_var_t *
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config_find_option(const char *key)
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config_find_option(config_format_t *fmt, const char *key)
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{
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int i;
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size_t keylen = strlen(key);
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if (!keylen)
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return NULL; /* if they say "--" on the commandline, it's not an option */
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/* First, check for an exact (case-insensitive) match */
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for (i=0; config_vars[i].name; ++i) {
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if (!strcasecmp(key, config_vars[i].name))
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return &config_vars[i];
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for (i=0; fmt->vars[i].name; ++i) {
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if (!strcasecmp(key, fmt->vars[i].name))
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return &fmt->vars[i];
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}
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/* If none, check for an abbreviated match */
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for (i=0; config_vars[i].name; ++i) {
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if (!strncasecmp(key, config_vars[i].name, keylen)) {
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for (i=0; fmt->vars[i].name; ++i) {
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if (!strncasecmp(key, fmt->vars[i].name, keylen)) {
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log_fn(LOG_WARN, "The abbreviation '%s' is deprecated. "
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"Tell Nick and Roger to make it official, or just use '%s' instead",
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key, config_vars[i].name);
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return &config_vars[i];
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key, fmt->vars[i].name);
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return &fmt->vars[i];
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}
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}
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/* Okay, unrecognized options */
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@ -577,13 +620,16 @@ config_find_option(const char *key)
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* option to its default value.
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*/
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static int
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config_assign_line(or_options_t *options, struct config_line_t *c, int reset)
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config_assign_line(config_format_t *fmt,
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or_options_t *options, struct config_line_t *c, int reset)
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{
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int i, ok;
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config_var_t *var;
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void *lvalue;
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var = config_find_option(c->key);
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CHECK(fmt, options);
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var = config_find_option(fmt, c->key);
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if (!var) {
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log_fn(LOG_WARN, "Unknown option '%s'. Failing.", c->key);
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return -1;
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@ -595,7 +641,7 @@ config_assign_line(or_options_t *options, struct config_line_t *c, int reset)
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}
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if (reset && !strlen(c->value)) {
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option_reset(options, var);
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option_reset(fmt, options, var);
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return 0;
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}
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@ -680,22 +726,24 @@ config_assign_line(or_options_t *options, struct config_line_t *c, int reset)
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/** restore the option named <b>key</b> in options to its default value. */
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static void
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config_reset_line(or_options_t *options, const char *key)
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config_reset_line(config_format_t *fmt, or_options_t *options, const char *key)
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{
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config_var_t *var;
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var = config_find_option(key);
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CHECK(fmt, options);
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var = config_find_option(fmt, key);
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if (!var)
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return; /* give error on next pass. */
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option_reset(options, var);
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option_reset(fmt, options, var);
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}
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/** Return true iff key is a valid configuration option. */
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int
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config_option_is_recognized(const char *key)
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{
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config_var_t *var = config_find_option(key);
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config_var_t *var = config_find_option(&config_format, key);
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return (var != NULL);
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}
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@ -703,14 +751,21 @@ config_option_is_recognized(const char *key)
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const char *
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config_option_get_canonical_name(const char *key)
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{
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config_var_t *var = config_find_option(key);
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config_var_t *var = config_find_option(&config_format, key);
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return var->name;
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}
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/** Return a canonicalized list of the options assigned for key.
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*/
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struct config_line_t *
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config_get_assigned_option(or_options_t *options, const char *key)
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{
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return get_assigned_option(&config_format, options, key);
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}
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static struct config_line_t *
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get_assigned_option(config_format_t *fmt, or_options_t *options, const char *key)
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{
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config_var_t *var;
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const void *value;
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@ -718,7 +773,9 @@ config_get_assigned_option(or_options_t *options, const char *key)
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struct config_line_t *result;
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tor_assert(options && key);
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var = config_find_option(key);
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CHECK(fmt, options);
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var = config_find_option(fmt, key);
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if (!var) {
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log_fn(LOG_WARN, "Unknown option '%s'. Failing.", key);
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return NULL;
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@ -808,14 +865,16 @@ config_get_assigned_option(or_options_t *options, const char *key)
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* -2 on bad value.
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*/
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static int
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config_assign(or_options_t *options, struct config_line_t *list, int reset)
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config_assign(config_format_t *fmt,
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or_options_t *options, struct config_line_t *list, int reset)
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{
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struct config_line_t *p;
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tor_assert(options);
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CHECK(fmt, options);
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/* pass 1: normalize keys */
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for (p = list; p; p = p->next) {
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const char *full = expand_abbrev(p->key, 0);
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const char *full = expand_abbrev(fmt, p->key, 0);
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if (strcmp(full,p->key)) {
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tor_free(p->key);
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p->key = tor_strdup(full);
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@ -826,13 +885,13 @@ config_assign(or_options_t *options, struct config_line_t *list, int reset)
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* linelists. */
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if (reset) {
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for (p = list; p; p = p->next)
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config_reset_line(options, p->key);
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config_reset_line(fmt, options, p->key);
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}
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/* pass 3: assign. */
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while (list) {
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int r;
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if ((r=config_assign_line(options, list, reset)))
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if ((r=config_assign_line(fmt, options, list, reset)))
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return r;
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list = list->next;
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}
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@ -849,20 +908,20 @@ int
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config_trial_assign(struct config_line_t *list, int reset)
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{
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int r;
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or_options_t *trial_options = options_dup(get_options());
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or_options_t *trial_options = options_dup(&config_format, get_options());
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if ((r=config_assign(trial_options, list, reset)) < 0) {
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options_free(trial_options);
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if ((r=config_assign(&config_format, trial_options, list, reset)) < 0) {
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options_free(&config_format, trial_options);
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return r;
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}
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if (options_validate(trial_options) < 0) {
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options_free(trial_options);
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options_free(&config_format, trial_options);
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return -2;
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}
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if (options_transition_allowed(get_options(), trial_options) < 0) {
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options_free(trial_options);
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options_free(&config_format, trial_options);
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return -3;
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}
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@ -873,11 +932,13 @@ config_trial_assign(struct config_line_t *list, int reset)
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/** Replace the option indexed by <b>var</b> in <b>options</b> with its
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* default value. */
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static void
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option_reset(or_options_t *options, config_var_t *var)
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option_reset(config_format_t *fmt, or_options_t *options, config_var_t *var)
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{
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struct config_line_t *c;
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void *lvalue;
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CHECK(fmt, options);
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lvalue = ((char*)options) + var->var_offset;
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switch (var->type) {
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case CONFIG_TYPE_STRING:
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@ -916,7 +977,7 @@ option_reset(or_options_t *options, config_var_t *var)
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c = tor_malloc_zero(sizeof(struct config_line_t));
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c->key = tor_strdup(var->name);
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c->value = tor_strdup(var->initvalue);
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config_assign_line(options,c,0);
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config_assign_line(fmt, options,c,0);
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config_free_lines(c);
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}
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}
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@ -1071,16 +1132,16 @@ get_default_nickname(void)
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/** Release storage held by <b>options</b> */
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static void
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options_free(or_options_t *options)
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options_free(config_format_t *fmt,or_options_t *options)
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{
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int i;
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void *lvalue;
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tor_assert(options);
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for (i=0; config_vars[i].name; ++i) {
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lvalue = ((char*)options) + config_vars[i].var_offset;
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switch (config_vars[i].type) {
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for (i=0; fmt->vars[i].name; ++i) {
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lvalue = ((char*)options) + fmt->vars[i].var_offset;
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switch (fmt->vars[i].type) {
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case CONFIG_TYPE_MEMUNIT:
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case CONFIG_TYPE_INTERVAL:
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case CONFIG_TYPE_UINT:
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@ -1115,12 +1176,16 @@ options_free(or_options_t *options)
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* and <b>o2</b>. Must not be called for LINELIST_S or OBSOLETE options.
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*/
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static int
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option_is_same(or_options_t *o1, or_options_t *o2, const char *name)
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option_is_same(config_format_t *fmt,
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or_options_t *o1, or_options_t *o2, const char *name)
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{
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struct config_line_t *c1, *c2;
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int r = 1;
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c1 = config_get_assigned_option(o1, name);
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c2 = config_get_assigned_option(o2, name);
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CHECK(fmt, o1);
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CHECK(fmt, o2);
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c1 = get_assigned_option(fmt, o1, name);
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c2 = get_assigned_option(fmt, o2, name);
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while (c1 && c2) {
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if (strcasecmp(c1->key, c2->key) ||
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strcmp(c1->value, c2->value)) {
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@ -1140,21 +1205,21 @@ option_is_same(or_options_t *o1, or_options_t *o2, const char *name)
|
||||
|
||||
/** Copy storage held by <b>old</b> into a new or_options_t and return it. */
|
||||
static or_options_t *
|
||||
options_dup(or_options_t *old)
|
||||
options_dup(config_format_t *fmt, or_options_t *old)
|
||||
{
|
||||
or_options_t *newopts;
|
||||
int i;
|
||||
struct config_line_t *line;
|
||||
|
||||
newopts = tor_malloc_zero(sizeof(or_options_t));
|
||||
for (i=0; config_vars[i].name; ++i) {
|
||||
if (config_vars[i].type == CONFIG_TYPE_LINELIST_S)
|
||||
newopts = config_alloc(fmt);
|
||||
for (i=0; fmt->vars[i].name; ++i) {
|
||||
if (fmt->vars[i].type == CONFIG_TYPE_LINELIST_S)
|
||||
continue;
|
||||
if (config_vars[i].type == CONFIG_TYPE_OBSOLETE)
|
||||
if (fmt->vars[i].type == CONFIG_TYPE_OBSOLETE)
|
||||
continue;
|
||||
line = config_get_assigned_option(old, config_vars[i].name);
|
||||
line = get_assigned_option(fmt, old, fmt->vars[i].name);
|
||||
if (line) {
|
||||
if (config_assign(newopts, line, 0) < 0) {
|
||||
if (config_assign(fmt, newopts, line, 0) < 0) {
|
||||
log_fn(LOG_WARN,"Bug: config_get_assigned_option() generated "
|
||||
"something we couldn't config_assign().");
|
||||
tor_assert(0);
|
||||
@ -1169,24 +1234,27 @@ options_dup(or_options_t *old)
|
||||
* Each option defaults to zero. */
|
||||
void
|
||||
options_init(or_options_t *options)
|
||||
{
|
||||
config_init(&config_format, options);
|
||||
}
|
||||
|
||||
static void
|
||||
config_init(config_format_t *fmt, or_options_t *options)
|
||||
{
|
||||
int i;
|
||||
config_var_t *var;
|
||||
CHECK(fmt, options);
|
||||
|
||||
for (i=0; config_vars[i].name; ++i) {
|
||||
var = &config_vars[i];
|
||||
for (i=0; fmt->vars[i].name; ++i) {
|
||||
var = &fmt->vars[i];
|
||||
if (!var->initvalue)
|
||||
continue; /* defaults to NULL or 0 */
|
||||
option_reset(options, var);
|
||||
option_reset(fmt, options, var);
|
||||
}
|
||||
}
|
||||
|
||||
/** Return a string containing a possible configuration file that would give
|
||||
* the configuration in <b>options</b>. If <b>minimal</b> is true, do not
|
||||
* include options that are the same as Tor's defaults.
|
||||
*/
|
||||
char *
|
||||
config_dump_options(or_options_t *options, int minimal)
|
||||
static char *
|
||||
config_dump(config_format_t *fmt, or_options_t *options, int minimal)
|
||||
{
|
||||
smartlist_t *elements;
|
||||
or_options_t *defaults;
|
||||
@ -1194,21 +1262,21 @@ config_dump_options(or_options_t *options, int minimal)
|
||||
char *result;
|
||||
int i;
|
||||
|
||||
defaults = tor_malloc_zero(sizeof(or_options_t));
|
||||
options_init(defaults);
|
||||
options_validate(defaults); /* ??? will this work? */
|
||||
defaults = config_alloc(fmt);
|
||||
config_init(fmt, defaults);
|
||||
fmt->validate_fn(options);
|
||||
|
||||
elements = smartlist_create();
|
||||
for (i=0; config_vars[i].name; ++i) {
|
||||
if (config_vars[i].type == CONFIG_TYPE_OBSOLETE ||
|
||||
config_vars[i].type == CONFIG_TYPE_LINELIST_S)
|
||||
for (i=0; fmt->vars[i].name; ++i) {
|
||||
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(config_vars[i].name, "__"))
|
||||
if (!strcmpstart(fmt->vars[i].name, "__"))
|
||||
continue;
|
||||
if (minimal && option_is_same(options, defaults, config_vars[i].name))
|
||||
if (minimal && option_is_same(fmt, options, defaults, fmt->vars[i].name))
|
||||
continue;
|
||||
line = config_get_assigned_option(options, config_vars[i].name);
|
||||
line = get_assigned_option(fmt, options, fmt->vars[i].name);
|
||||
for (; line; line = line->next) {
|
||||
size_t len = strlen(line->key) + strlen(line->value) + 3;
|
||||
char *tmp;
|
||||
@ -1228,6 +1296,16 @@ config_dump_options(or_options_t *options, int minimal)
|
||||
return result;
|
||||
}
|
||||
|
||||
/** Return a string containing a possible configuration file that would give
|
||||
* the configuration in <b>options</b>. If <b>minimal</b> is true, do not
|
||||
* include options that are the same as Tor's defaults.
|
||||
*/
|
||||
char *
|
||||
config_dump_options(or_options_t *options, int minimal)
|
||||
{
|
||||
return config_dump(&config_format, options, minimal);
|
||||
}
|
||||
|
||||
static int
|
||||
validate_ports_csv(smartlist_t *sl, const char *name)
|
||||
{
|
||||
@ -1809,6 +1887,7 @@ init_from_config(int argc, char **argv)
|
||||
}
|
||||
|
||||
newoptions = tor_malloc_zero(sizeof(or_options_t));
|
||||
newoptions->_magic = OR_OPTIONS_MAGIC;
|
||||
options_init(newoptions);
|
||||
|
||||
/* learn config file name, get config lines, assign them */
|
||||
@ -1875,7 +1954,7 @@ init_from_config(int argc, char **argv)
|
||||
tor_free(cf);
|
||||
if (retval < 0)
|
||||
goto err;
|
||||
retval = config_assign(newoptions, cl, 0);
|
||||
retval = config_assign(&config_format, newoptions, cl, 0);
|
||||
config_free_lines(cl);
|
||||
if (retval < 0)
|
||||
goto err;
|
||||
@ -1883,7 +1962,7 @@ init_from_config(int argc, char **argv)
|
||||
|
||||
/* Go through command-line variables too */
|
||||
cl = config_get_commandlines(argc,argv);
|
||||
retval = config_assign(newoptions,cl,0);
|
||||
retval = config_assign(&config_format, newoptions,cl,0);
|
||||
config_free_lines(cl);
|
||||
if (retval < 0)
|
||||
goto err;
|
||||
@ -1905,7 +1984,7 @@ init_from_config(int argc, char **argv)
|
||||
return 0;
|
||||
err:
|
||||
tor_free(fname);
|
||||
options_free(newoptions);
|
||||
options_free(&config_format, newoptions);
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
@ -1017,6 +1017,8 @@ typedef struct exit_redirect_t {
|
||||
|
||||
/** Configuration options for a Tor process */
|
||||
typedef struct {
|
||||
uint32_t _magic;
|
||||
|
||||
/** What should the tor process actually do? */
|
||||
enum {
|
||||
CMD_RUN_TOR=0, CMD_LIST_FINGERPRINT, CMD_HASH_PASSWORD,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user