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Refactor the config gathering code to be reusable

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This moves adding to lists and getting long values into resuable functions.

	It also fixes a couple other issues in the process:
		1. Logging now goes to the error channel and is labelled
		2. >Max length lines are properly handled, although this should never happen since inih has a 200 limit
This commit is contained in:
Marc Di Luzio 2018-04-24 14:43:13 +01:00
parent 51e1e7203f
commit c45b9f90a4
1 changed files with 66 additions and 43 deletions
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109
daemon/daemon_config.c
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@ -45,10 +45,13 @@ POSSIBILITY OF SUCH DAMAGE.
#define CONFIG_NAME "gamemode.ini"
#define CONFIG_DIR "/usr/share/gamemode/"
/* Maximum values in the whilelist and blacklist */
/* Maximum values in a config list */
#define MAX_LIST_VALUES 32
/* Maximum length of values in the whilelist or blacklist */
/*
* Maximum length of values in a config list
* In practice inih has a INI_MAX_LINE value of 200, so this should never get hit
*/
#define MAX_LIST_VALUE_LENGTH 256
/* Default value for the reaper frequency */
@ -69,6 +72,60 @@ struct GameModeConfig {
long reaper_frequency;
};
/*
* Add values to a char list
*/
static bool append_value_to_list(const char *list_name, const char *value,
char list[MAX_LIST_VALUES][MAX_LIST_VALUE_LENGTH])
{
unsigned int i = 0;
while (*list[i] && ++i < MAX_LIST_VALUES)
;
if (i < MAX_LIST_VALUES) {
strncpy(list[i], value, MAX_LIST_VALUE_LENGTH);
if (list[i][MAX_LIST_VALUE_LENGTH - 1] != '\0') {
LOG_ERROR("Config: Could not add [%s] to [%s], exceeds length limit of %d\n",
value,
list_name,
MAX_LIST_VALUE_LENGTH);
memset(list[i], 0, sizeof(list[i]));
return false;
}
} else {
LOG_ERROR("Config: Could not add [%s] to [%s], exceeds number of %d\n",
value,
list_name,
MAX_LIST_VALUES);
return false;
}
return true;
}
/*
* Get a positive long value from a string
*/
static bool get_long_value(const char *value_name, const char *value, long *output)
{
char *end = NULL;
long config_value = strtol(value, &end, 10);
if (errno == ERANGE) {
LOG_ERROR("Config: %s overflowed, given [%s]\n", value_name, value);
return false;
} else if (config_value <= 0 || !(*value != '\0' && end && *end == '\0')) {
LOG_ERROR("Config: %s was invalid, given [%s]\n", value_name, value);
return false;
} else {
*output = config_value;
}
return true;
}
/*
* Handler for the inih callback
*/
@ -77,57 +134,23 @@ static int inih_handler(void *user, const char *section, const char *name, const
GameModeConfig *self = (GameModeConfig *)user;
bool valid = false;
/* Filter subsection */
if (strcmp(section, "filter") == 0) {
/* Filter subsection */
if (strcmp(name, "whitelist") == 0) {
valid = true;
unsigned int i = 0;
while (*self->whitelist[i] && ++i < MAX_LIST_VALUES)
;
if (i < MAX_LIST_VALUES) {
strncpy(self->whitelist[i], value, MAX_LIST_VALUE_LENGTH);
} else {
LOG_MSG("Could not add [%s] to the whitelist, exceeds limit of %d\n",
value,
MAX_LIST_VALUES);
}
valid = append_value_to_list(name, value, self->whitelist);
} else if (strcmp(name, "blacklist") == 0) {
valid = true;
unsigned int i = 0;
while (*self->blacklist[i] && ++i < MAX_LIST_VALUES)
;
if (i < MAX_LIST_VALUES) {
strncpy(self->blacklist[i], value, MAX_LIST_VALUE_LENGTH);
} else {
LOG_MSG("Could not add [%s] to the blacklist, exceeds limit of %d\n",
value,
MAX_LIST_VALUES);
}
valid = append_value_to_list(name, value, self->blacklist);
}
} else if (strcmp(section, "general") == 0) {
/* General subsection */
if (strcmp(name, "reaper_freq") == 0) {
valid = true;
char *end = NULL;
long chosen_freq = strtol(value, &end, 10);
if (errno == ERANGE) {
LOG_MSG("reaper_freq value overflowed, given [%s]\n", value);
} else if (chosen_freq <= 0 || !(*value != '\0' && end && *end == '\0')) {
LOG_MSG("reaper_freq value was invalid, given [%s]\n", value);
} else {
self->reaper_frequency = chosen_freq;
}
valid = get_long_value(name, value, &self->reaper_frequency);
}
}
if (!valid) {
/* We hit an unknown section succeed but with a log */
LOG_MSG("Unknown value in config file [%s] %s=%s\n", section, name, value);
/* Simply ignore the value, but with a log */
LOG_MSG("Config: Value ignored [%s] %s=%s\n", section, name, value);
}
return 1;