/**
* parse_default_igmp_querier_timeout - Parse default_igmp_querier_timeout option
* @s: String token
*
* Reads and assigns default querier timeout for an active IGMP querier.
* This is the time it takes before pimd tries to take over as the
* active querier. If the argument is missing or invalid the system
* will calculate a fallback based on the query interval.
*
* Syntax:
* default_igmp_querier_timeout <SEC>
*
* Returns:
* When parsing @s is successful this function returns %TRUE, otherwise %FALSE.
*/
static int parse_default_igmp_querier_timeout(char *s)
{
char *w;
uint32_t value = 0;
uint32_t recommended = QUERIER_TIMEOUT(default_igmp_query_interval);
if (EQUAL((w = next_word(&s)), "")) {
WARN("Missing argument to default_igmp_querier_timeout!");
} else if (sscanf(w, "%u", &value) != 1) {
WARN("Invalid default default_igmp_querier_timeout!");
value = 0;
}
/* Do some sanity checks to prevent invalid configuration and to recommend
* better settings, see GitHub issue troglobit/pimd#31 for details. */
if (value != 0) {
/* 1) Prevent invalid configuration */
if (value <= default_igmp_query_interval) {
WARN("IGMP querier timeout %d must be larger than the query interval %d, forcing default!",
value, default_igmp_query_interval);
value = recommended;
}
/* 2) Warn power user of potentially too low setting. */
if (value < recommended)
WARN("The IGMP querier timeout %d is smaller than the recommended value %d, allowing ...",
value, recommended);
logit(LOG_WARNING, 0, "Recommended querier timeout = Robustness x query-interval + response-time / 2 = %d x %d + %d / 2 = %d",
IGMP_ROBUSTNESS_VARIABLE, default_igmp_query_interval, IGMP_QUERY_RESPONSE_INTERVAL, recommended);
}
default_igmp_querier_timeout = value;
return TRUE;
}
void config_vifs_from_file(void)
{
FILE *f;
char linebuf[LINE_BUFSIZ];
char *w, *s;
struct ifconf ifc;
int option;
char ifbuf[BUFSIZ];
u_int8 *data_ptr;
int error_flag;
error_flag = FALSE;
lineno = 0;
if ((f = fopen(config_file, "r")) == NULL) {
if (errno != ENOENT)
logit(LOG_WARNING, errno, "Cannot open %s", config_file);
return;
}
/* TODO: HARDCODING!!! */
cand_rp_adv_message.buffer = calloc(1, 4 + sizeof(pim_encod_uni_addr_t) +
255 * sizeof(pim_encod_grp_addr_t));
if (!cand_rp_adv_message.buffer)
logit(LOG_ERR, errno, "Ran out of memory in config_vifs_from_file()");
cand_rp_adv_message.prefix_cnt_ptr = cand_rp_adv_message.buffer;
/* By default, if no group_prefix configured, then prefix_cnt == 0
* implies group_prefix = 224.0.0.0 and masklen = 4.
*/
*cand_rp_adv_message.prefix_cnt_ptr = 0;
cand_rp_adv_message.insert_data_ptr = cand_rp_adv_message.buffer;
/* TODO: XXX: HARDCODING!!! */
cand_rp_adv_message.insert_data_ptr += (4 + 6);
ifc.ifc_buf = ifbuf;
ifc.ifc_len = sizeof(ifbuf);
if (ioctl(udp_socket, SIOCGIFCONF, (char *)&ifc) < 0)
logit(LOG_ERR, errno, "Failed querying kernel network interfaces");
while (fgets(linebuf, sizeof(linebuf), f) != NULL) {
if (strlen(linebuf) >= (LINE_BUFSIZ - 1)) {
WARN("Line length must be shorter than %d", LINE_BUFSIZ);
error_flag = TRUE;
}
lineno++;
s = linebuf;
w = next_word(&s);
option = parse_option(w);
switch (option) {
case CONF_EMPTY:
continue;
break;
case CONF_PHYINT:
parse_phyint(s);
break;
case CONF_CANDIDATE_RP:
parse_candidateRP(s);
break;
case CONF_RP_ADDRESS:
parse_rp_address(s);
break;
case CONF_GROUP_PREFIX:
parse_group_prefix(s);
break;
case CONF_BOOTSTRAP_RP:
parseBSR(s);
break;
case CONF_COMPAT_THRESHOLD:
parse_compat_threshold(s);
break;
case CONF_SPT_THRESHOLD:
parse_spt_threshold(s);
break;
case CONF_DEFAULT_SOURCE_METRIC:
parse_default_source_metric(s);
break;
case CONF_DEFAULT_SOURCE_PREFERENCE:
parse_default_source_preference(s);
break;
case CONF_DEFAULT_IGMP_QUERY_INTERVAL:
parse_default_igmp_query_interval(s);
break;
case CONF_DEFAULT_IGMP_QUERIER_TIMEOUT:
parse_default_igmp_querier_timeout(s);
break;
default:
logit(LOG_WARNING, 0, "%s:%u - Unknown command '%s'", config_file, lineno, w);
error_flag = TRUE;
}
}
if (error_flag)
logit(LOG_ERR, 0, "%s:%u - Syntax error", config_file, lineno);
cand_rp_adv_message.message_size = cand_rp_adv_message.insert_data_ptr - cand_rp_adv_message.buffer;
if (cand_rp_flag != FALSE) {
/* Prepare the RP info */
my_cand_rp_holdtime = 2.5 * my_cand_rp_adv_period;
/* TODO: HARDCODING! */
data_ptr = cand_rp_adv_message.buffer + 1;
PUT_BYTE(my_cand_rp_priority, data_ptr);
PUT_HOSTSHORT(my_cand_rp_holdtime, data_ptr);
PUT_EUADDR(my_cand_rp_address, data_ptr);
}
/* If no IGMP querier timeout was set, calculate from query interval */
if (!default_igmp_querier_timeout)
default_igmp_querier_timeout = QUERIER_TIMEOUT(default_igmp_query_interval);
IF_DEBUG(DEBUG_IGMP) {
logit(LOG_INFO, 0, "IGMP query interval : %u sec", default_igmp_query_interval);
logit(LOG_INFO, 0, "IGMP querier timeout : %u sec", default_igmp_querier_timeout);
}
fclose(f);
}
void config_vifs_from_file(void)
{
FILE *fp;
char linebuf[LINE_BUFSIZ];
char *w, *s;
int option;
uint8_t *data_ptr;
int error_flag;
error_flag = FALSE;
lineno = 0;
/* TODO: HARDCODING!!! */
cand_rp_adv_message.buffer = calloc(1, 4 + sizeof(pim_encod_uni_addr_t) +
255 * sizeof(pim_encod_grp_addr_t));
if (!cand_rp_adv_message.buffer)
logit(LOG_ERR, errno, "Ran out of memory in config_vifs_from_file()");
cand_rp_adv_message.prefix_cnt_ptr = cand_rp_adv_message.buffer;
/* By default, if no group-prefix configured, then prefix_cnt == 0
* implies group-prefix = 224.0.0.0 and masklen = 4.
*/
*cand_rp_adv_message.prefix_cnt_ptr = 0;
cand_rp_adv_message.insert_data_ptr = cand_rp_adv_message.buffer;
/* TODO: XXX: HARDCODING!!! */
cand_rp_adv_message.insert_data_ptr += (4 + 6);
fp = fopen(config_file, "r");
if (!fp) {
logit(LOG_WARNING, errno, "Cannot open configuration file %s", config_file);
fallback_config();
goto nofile;
}
while (fgets(linebuf, sizeof(linebuf), fp)) {
if (strlen(linebuf) >= (LINE_BUFSIZ - 1)) {
WARN("Line length must be shorter than %d", LINE_BUFSIZ);
error_flag = TRUE;
}
lineno++;
s = linebuf;
w = next_word(&s);
option = parse_option(w);
switch (option) {
case CONF_EMPTY:
continue;
break;
case CONF_PHYINT:
parse_phyint(s);
break;
case CONF_CANDIDATE_RP:
parse_rp_candidate(s);
break;
case CONF_RP_ADDRESS:
parse_rp_address(s);
break;
case CONF_GROUP_PREFIX:
parse_group_prefix(s);
break;
case CONF_BOOTSTRAP_RP:
parse_bsr_candidate(s);
break;
case CONF_COMPAT_THRESHOLD:
parse_compat_threshold(s);
break;
case CONF_SPT_THRESHOLD:
parse_spt_threshold(s);
break;
case CONF_DEFAULT_ROUTE_METRIC:
parse_default_route_metric(s);
break;
case CONF_DEFAULT_ROUTE_DISTANCE:
parse_default_route_distance(s);
break;
case CONF_IGMP_QUERY_INTERVAL:
parse_igmp_query_interval(s);
break;
case CONF_IGMP_QUERIER_TIMEOUT:
parse_igmp_querier_timeout(s);
break;
case CONF_HELLO_INTERVAL:
parse_hello_interval(s);
break;
default:
logit(LOG_WARNING, 0, "%s:%u - Unknown command '%s'", config_file, lineno, w);
error_flag = TRUE;
}
}
fclose(fp);
nofile:
/* A static RP address is needed for SSM. We use a link-local
* address. It is not required to be configured on any interface. */
strncpy(linebuf, "169.254.0.1 232.0.0.0/8\n", sizeof(linebuf));
s = linebuf;
parse_rp_address(s);
if (error_flag)
logit(LOG_ERR, 0, "%s:%u - Syntax error", config_file, lineno);
cand_rp_adv_message.message_size = cand_rp_adv_message.insert_data_ptr - cand_rp_adv_message.buffer;
if (cand_rp_flag != FALSE) {
/* Prepare the RP info */
my_cand_rp_holdtime = 2.5 * my_cand_rp_adv_period;
/* TODO: HARDCODING! */
data_ptr = cand_rp_adv_message.buffer + 1;
PUT_BYTE(my_cand_rp_priority, data_ptr);
PUT_HOSTSHORT(my_cand_rp_holdtime, data_ptr);
PUT_EUADDR(my_cand_rp_address, data_ptr);
}
/* If no IGMP querier timeout was set, calculate from query interval */
if (!igmp_querier_timeout)
igmp_querier_timeout = QUERIER_TIMEOUT(igmp_query_interval);
IF_DEBUG(DEBUG_IGMP) {
logit(LOG_INFO, 0, "IGMP query interval : %u sec", igmp_query_interval);
logit(LOG_INFO, 0, "IGMP querier timeout : %u sec", igmp_querier_timeout);
}
}
