F_NONNULL
static unsigned dcinfo_init_auto(dcinfo_t* info, vscf_data_t* dc_auto_cfg, const char* map_name)
{
if (!vscf_is_hash(dc_auto_cfg))
log_fatal("plugin_geoip: map '%s': auto_dc_coords must be a key-value hash", map_name);
const unsigned num_auto = vscf_hash_get_len(dc_auto_cfg);
const unsigned num_dcs = info->num_dcs;
for (unsigned i = 0; i < num_dcs; i++) {
info->dcs[i].coords.lat = (double)NAN;
info->dcs[i].coords.lon = (double)NAN;
info->dcs[i].coords.cos_lat = (double)NAN;
}
for (unsigned i = 0; i < num_auto; i++) {
const char* dcname = vscf_hash_get_key_byindex(dc_auto_cfg, i, NULL);
unsigned dcidx;
for (dcidx = 0; dcidx < num_dcs; dcidx++) {
if (!strcmp(dcname, info->dcs[dcidx].name))
break;
}
if (dcidx == num_dcs)
log_fatal("plugin_geoip: map '%s': auto_dc_coords key '%s' not matched from 'datacenters' list", map_name, dcname);
GDNSD_DIAG_PUSH_IGNORED("-Wdouble-promotion")
if (!isnan(info->dcs[dcidx].coords.lat))
log_fatal("plugin_geoip: map '%s': auto_dc_coords key '%s' defined twice", map_name, dcname);
GDNSD_DIAG_POP
vscf_data_t* coord_cfg = vscf_hash_get_data_byindex(dc_auto_cfg, i);
if (!vscf_is_array(coord_cfg) || vscf_array_get_len(coord_cfg) != 2)
log_fatal("plugin_geoip: map '%s': auto_dc_coords value for datacenter '%s' must be an array of two values", map_name, dcname);
vscf_data_t* lat_cfg = vscf_array_get_data(coord_cfg, 0);
vscf_data_t* lon_cfg = vscf_array_get_data(coord_cfg, 1);
gdnsd_assert(lat_cfg);
gdnsd_assert(lon_cfg);
double lat;
double lon;
if (!vscf_is_simple(lat_cfg)
|| !vscf_is_simple(lon_cfg)
|| !vscf_simple_get_as_double(lat_cfg, &lat)
|| !vscf_simple_get_as_double(lon_cfg, &lon)
|| lat > 90.0 || lat < -90.0
|| lon > 180.0 || lon < -180.0
)
log_fatal("plugin_geoip: map '%s': auto_dc_coords value for datacenter '%s' must be a legal latitude and longitude in decimal degrees", map_name, dcname);
info->dcs[dcidx].coords.lat = lat * DEG2RAD;
info->dcs[dcidx].coords.lon = lon * DEG2RAD;
info->dcs[dcidx].coords.cos_lat = cos(lat * DEG2RAD);
}
return num_auto;
}
// Technically we could/should check for duplicates here. The plugin will
// still fail later though: when a resource is defined, the datacenter
// names go into a hash requiring uniqueness, and the count is required
// to match (ditto for auto_dc_coords never succeeding with dupes in the
// datacenters list).
dcinfo_t* dcinfo_new(const vscf_data_t* dc_cfg, const vscf_data_t* dc_auto_cfg, const vscf_data_t* dc_auto_limit_cfg, const char* map_name) {
dmn_assert(dc_cfg); dmn_assert(map_name);
dcinfo_t* info = malloc(sizeof(dcinfo_t));
const unsigned num_dcs = vscf_array_get_len(dc_cfg);
unsigned num_auto = num_dcs;
if(!num_dcs)
log_fatal("plugin_geoip: map '%s': 'datacenters' must be an array of one or more strings", map_name);
if(num_dcs > 254)
log_fatal("plugin_geoip: map '%s': %u datacenters is too many, this code only supports up to 254", map_name, num_dcs);
info->names = malloc(sizeof(char*) * num_dcs);
info->num_dcs = num_dcs;
for(unsigned i = 0; i < num_dcs; i++) {
const vscf_data_t* dcname_cfg = vscf_array_get_data(dc_cfg, i);
if(!dcname_cfg || !vscf_is_simple(dcname_cfg))
log_fatal("plugin_geoip: map '%s': 'datacenters' must be an array of one or more strings", map_name);
info->names[i] = strdup(vscf_simple_get_data(dcname_cfg));
if(!strcmp(info->names[i], "auto"))
log_fatal("plugin_geoip: map '%s': datacenter name 'auto' is illegal", map_name);
}
if(dc_auto_cfg) {
if(!vscf_is_hash(dc_auto_cfg))
log_fatal("plugin_geoip: map '%s': auto_dc_coords must be a key-value hash", map_name);
num_auto = vscf_hash_get_len(dc_auto_cfg);
info->coords = malloc(num_dcs * 2 * sizeof(double));
for(unsigned i = 0; i < 2*num_dcs; i++)
info->coords[i] = NAN;
for(unsigned i = 0; i < num_auto; i++) {
const char* dcname = vscf_hash_get_key_byindex(dc_auto_cfg, i, NULL);
unsigned dcidx;
for(dcidx = 0; dcidx < num_dcs; dcidx++) {
if(!strcmp(dcname, info->names[dcidx]))
break;
}
if(dcidx == num_dcs)
log_fatal("plugin_geoip: map '%s': auto_dc_coords key '%s' not matched from 'datacenters' list", map_name, dcname);
if(!isnan(info->coords[(dcidx*2)]))
log_fatal("plugin_geoip: map '%s': auto_dc_coords key '%s' defined twice", map_name, dcname);
const vscf_data_t* coord_cfg = vscf_hash_get_data_byindex(dc_auto_cfg, i);
const vscf_data_t* lat_cfg;
const vscf_data_t* lon_cfg;
double lat, lon;
if(
!vscf_is_array(coord_cfg) || vscf_array_get_len(coord_cfg) != 2
|| !(lat_cfg = vscf_array_get_data(coord_cfg, 0))
|| !(lon_cfg = vscf_array_get_data(coord_cfg, 1))
|| !vscf_is_simple(lat_cfg)
|| !vscf_is_simple(lon_cfg)
|| !vscf_simple_get_as_double(lat_cfg, &lat)
|| !vscf_simple_get_as_double(lon_cfg, &lon)
|| lat > 90.0 || lat < -90.0
|| lon > 180.0 || lon < -180.0
)
log_fatal("plugin_geoip: map '%s': auto_dc_coords value for datacenter '%s' must be an array of two floating-point values representing a legal latitude and longitude in decimal degrees", map_name, dcname);
info->coords[(dcidx * 2)] = lat * DEG2RAD;
info->coords[(dcidx * 2) + 1] = lon * DEG2RAD;
}
}
else {
info->coords = NULL;
}
if(dc_auto_limit_cfg) {
unsigned long auto_limit_ul;
if(!vscf_is_simple(dc_auto_limit_cfg) || !vscf_simple_get_as_ulong(dc_auto_limit_cfg, &auto_limit_ul))
log_fatal("plugin_geoip: map '%s': auto_dc_limit must be a single unsigned integer value", map_name);
if(auto_limit_ul > num_auto || !auto_limit_ul)
auto_limit_ul = num_auto;
info->auto_limit = auto_limit_ul;
}
else {
info->auto_limit = (num_auto > 3) ? 3 : num_auto;
}
return info;
}
F_NONNULL
static void config_addrset(const char* res_name, const char* stanza, const bool ipv6, addrset_t* addrset, const vscf_data_t* cfg) {
dmn_assert(res_name); dmn_assert(stanza); dmn_assert(addrset); dmn_assert(cfg);
if(!vscf_is_hash(cfg))
log_fatal("plugin_weighted: resource '%s' stanza '%s' value must be a hash", res_name, stanza);
const vscf_data_t* parent = vscf_get_parent(cfg);
// inherit down the applicable res-level parameters
vscf_hash_inherit(parent, (vscf_data_t*)cfg, "service_types", true);
vscf_hash_inherit(parent, (vscf_data_t*)cfg, "multi", true);
vscf_hash_inherit(parent, (vscf_data_t*)cfg, "up_thresh", true);
// Get a starting assumption of our item count
addrset->count = vscf_hash_get_len(cfg);
/////// Process the parameters...
// service_types
const vscf_data_t* res_stypes = vscf_hash_get_data_byconstkey(cfg, "service_types", true);
if (res_stypes) {
addrset->count--; // minus one for service_types entry
addrset->num_svcs = vscf_array_get_len(res_stypes);
if(!addrset->num_svcs)
log_fatal("plugin_weighted: resource '%s' (%s): service_types cannot be an empty array", res_name, stanza);
addrset->svc_names = malloc(addrset->num_svcs * sizeof(char*));
for(unsigned i = 0; i < addrset->num_svcs; i++) {
const vscf_data_t* this_svc_cfg = vscf_array_get_data(res_stypes, i);
if(!vscf_is_simple(this_svc_cfg))
log_fatal("plugin_weighted: resource '%s' (%s): service_types values must be strings", res_name, stanza);
addrset->svc_names[i] = strdup(vscf_simple_get_data(this_svc_cfg));
}
}
else {
addrset->num_svcs = 1;
addrset->svc_names = malloc(sizeof(char*));
addrset->svc_names[0] = strdup("default");
}
// multi option
addrset->multi = false;
const vscf_data_t* multi_cfg = vscf_hash_get_data_byconstkey(cfg, "multi", true);
if(multi_cfg) {
addrset->count--; // minus one for multi entry
if(!vscf_is_simple(multi_cfg) || !vscf_simple_get_as_bool(multi_cfg, &addrset->multi))
log_fatal("plugin_weighted: resource '%s' (%s): 'multi' must be a boolean value ('true' or 'false')", res_name, stanza);
}
// up threshold as double
double up_thresh = 0.5;
const vscf_data_t* thresh_cfg = vscf_hash_get_data_byconstkey(cfg, "up_thresh", true);
if(thresh_cfg) {
addrset->count--; // minus one for up_thresh entry
if(!vscf_is_simple(thresh_cfg) || !vscf_simple_get_as_double(thresh_cfg, &up_thresh)
|| up_thresh <= 0.0 || up_thresh > 1.0)
log_fatal("plugin_weighted: resource '%s' (%s): 'up_thresh' must be a floating point value in the range (0.0 - 1.0]", res_name, stanza);
}
if(addrset->count > MAX_ITEMS_PER_SET)
log_fatal("plugin_weighted: resource '%s' (%s): number of direct groups or addrs within one family cannot be more than %u", res_name, stanza, MAX_ITEMS_PER_SET);
if(!addrset->count)
log_fatal("plugin_weighted: resource '%s' (%s): empty address-family sets not allowed", res_name, stanza);
// track maximum res-size actually configured
if(cfg_max_items_per_res < addrset->count)
cfg_max_items_per_res = addrset->count;
addrset->items = calloc(addrset->count, sizeof(res_aitem_t));
addrset->gmode = RES_ASET_UNKNOWN;
addr_iter_data_t aid = {
.item_idx = 0,
.addrset = addrset,
.res_name = res_name,
.stanza = stanza,
.ipv6 = ipv6
};
vscf_hash_iterate(cfg, true, config_addrset_item, &aid);
addrset->weight = 0;
addrset->max_weight = 0;
for(unsigned i = 0; i < addrset->count; i++) {
const unsigned iwt = addrset->items[i].weight;
dmn_assert(iwt); dmn_assert(addrset->items[i].max_weight);
addrset->weight += iwt;
if(addrset->max_weight < iwt)
addrset->max_weight = iwt;
}
dmn_assert(addrset->weight);
dmn_assert(addrset->max_weight);
addrset->up_weight = ceil(up_thresh * addrset->weight);
dmn_assert(addrset->up_weight);
}
typedef struct {
cnset_t* cnset;
const char* res_name;
const char* stanza;
unsigned item_idx;
} cname_iter_data_t;
F_NONNULL
static bool config_item_cname(const char* item_name, unsigned klen V_UNUSED, const vscf_data_t* cfg_data, void* cid_asvoid) {
dmn_assert(item_name); dmn_assert(cfg_data); dmn_assert(cid_asvoid);
cname_iter_data_t* cid = (cname_iter_data_t*)cid_asvoid;
cnset_t* cnset = cid->cnset;
const char* res_name = cid->res_name;
const char* stanza = cid->stanza;
const unsigned item_idx = cid->item_idx++;
res_citem_t* res_item = &cnset->items[item_idx];
long wtemp = 0;
if(!vscf_is_array(cfg_data)
|| (2 != vscf_array_get_len(cfg_data))
|| !vscf_is_simple(vscf_array_get_data(cfg_data, 0))
|| !vscf_is_simple(vscf_array_get_data(cfg_data, 1))
|| !vscf_simple_get_as_long(vscf_array_get_data(cfg_data, 1), &wtemp)
|| wtemp < 1 || wtemp > MAX_WEIGHT )
log_fatal("plugin_weighted: resource '%s' (%s), item '%s': values in cname mode must be arrays of [ CNAME, WEIGHT ], where weight must be an integer in the range 1 - " MAX_WEIGHT_STR, res_name, stanza, item_name);
res_item->weight = wtemp;
uint8_t* dname = malloc(256);
dname_status_t dnstat = vscf_simple_get_as_dname(vscf_array_get_data(cfg_data, 0), dname);
if(dnstat == DNAME_INVALID)
log_fatal("plugin_weighted: resource '%s' (%s), item '%s': '%s' is not a legal domainname", res_name, stanza, item_name, vscf_simple_get_data(vscf_array_get_data(cfg_data, 0)));
if(dnstat == DNAME_VALID)
dname = dname_trim(dname);
res_item->cname = dname;
log_debug("plugin_weighted: resource '%s' (%s), item '%s', CNAME '%s' added with weight %u", res_name, stanza, item_name, logf_dname(dname), res_item->weight);
return true;
}
F_NONNULL
static void config_cnameset(const char* res_name, const char* stanza, cnset_t* cnset, const vscf_data_t* cfg) {
dmn_assert(res_name); dmn_assert(stanza); dmn_assert(cnset); dmn_assert(cfg);
if(!vscf_is_hash(cfg))
log_fatal("plugin_weighted: resource '%s' stanza '%s' value must be a hash", res_name, stanza);
cnset->count = vscf_hash_get_len(cfg);
// service_types
cnset->num_svcs = 0;
const vscf_data_t* res_stypes = vscf_hash_get_data_byconstkey(cfg, "service_types", true);
if (res_stypes) {
cnset->count--; // minus one for service_types entry
cnset->num_svcs = vscf_array_get_len(res_stypes);
if(cnset->num_svcs) {
cnset->svc_names = malloc(cnset->num_svcs * sizeof(char*));
for(unsigned i = 0; i < cnset->num_svcs; i++) {
const vscf_data_t* this_svc_cfg = vscf_array_get_data(res_stypes, i);
if(!vscf_is_simple(this_svc_cfg))
log_fatal("plugin_weighted: resource '%s' (%s): service_types values must be strings", res_name, stanza);
cnset->svc_names[i] = strdup(vscf_simple_get_data(this_svc_cfg));
}
}
}
else {
cnset->num_svcs = 1;
cnset->svc_names = malloc(sizeof(char*));
cnset->svc_names[0] = strdup(DEFAULT_SVCNAME);
}
// up threshold as double
double up_thresh = 0.5;
const vscf_data_t* thresh_cfg = vscf_hash_get_data_byconstkey(cfg, "up_thresh", true);
if(thresh_cfg) {
cnset->count--; // minus one for up_thresh entry
if(!vscf_is_simple(thresh_cfg) || !vscf_simple_get_as_double(thresh_cfg, &up_thresh)
|| up_thresh <= 0.0 || up_thresh > 1.0)
log_fatal("plugin_weighted: resource '%s' (%s): 'up_thresh' must be a floating point value in the range (0.0 - 1.0]", res_name, stanza);
}
// multi option is processed for count-correctness, but ignored (it's not legal
// here, but may be present due to inheritance of defaults!)
if(vscf_hash_get_data_byconstkey(cfg, "multi", true))
cnset->count--;
if(cnset->count > MAX_ITEMS_PER_SET)
log_fatal("plugin_weighted: resource '%s' (%s): number of cnames cannot be more than %u", res_name, stanza, MAX_ITEMS_PER_SET);
if(!cnset->count)
log_fatal("plugin_weighted: resource '%s' (%s): empty cname sets not allowed", res_name, stanza);
cnset->items = calloc(cnset->count, sizeof(res_citem_t));
cname_iter_data_t cid = {
.cnset = cnset,
.res_name = res_name,
.stanza = stanza,
.item_idx = 0,
};
vscf_hash_iterate(cfg, true, config_item_cname, &cid);
cnset->weight = 0;
for(unsigned i = 0; i < cnset->count; i++) {
const unsigned cwt = cnset->items[i].weight;
dmn_assert(cwt);
cnset->weight += cwt;
}
dmn_assert(cnset->weight);
cnset->up_weight = ceil(up_thresh * cnset->weight);
}
F_NONNULL
static void config_auto(resource_t* res, const vscf_data_t* res_cfg) {
dmn_assert(res); dmn_assert(res_cfg); dmn_assert(vscf_is_hash(res_cfg));
// mark all possible parameter-keys
vscf_hash_get_data_byconstkey(res_cfg, "service_types", true);
vscf_hash_get_data_byconstkey(res_cfg, "multi", true);
vscf_hash_get_data_byconstkey(res_cfg, "up_thresh", true);
// make a copy that contains no parameters, only item-name keys
vscf_data_t* res_cfg_noparams = vscf_clone(res_cfg, true);
if(!vscf_hash_get_len(res_cfg_noparams))
log_fatal("plugin_weighted: resource '%s' (direct) contains no weighted items", res->name);
const char* first_name = vscf_hash_get_key_byindex(res_cfg_noparams, 0, NULL);
const vscf_data_t* first_cfg = vscf_hash_get_data_byindex(res_cfg_noparams, 0);
if(vscf_is_hash(first_cfg)) { // grouped address mode...
if(!vscf_hash_get_len(first_cfg))
log_fatal("plugin_weighted: resource '%s' (direct): group '%s': contains no addresses", res->name, first_name);
const char* lb_name = vscf_hash_get_key_byindex(first_cfg, 0, NULL);
const vscf_data_t* lb_cfg = vscf_hash_get_data_byindex(first_cfg, 0);
if(!vscf_is_array(lb_cfg) || !vscf_array_get_len(lb_cfg) || !vscf_is_simple(vscf_array_get_data(lb_cfg, 0)))
log_fatal("plugin_weighted: resource '%s' (direct): group '%s': item '%s': value must be an array of [ IP, weight ]", res->name, first_name, lb_name);
const char* first_addr_txt = vscf_simple_get_data(vscf_array_get_data(lb_cfg, 0));
dmn_anysin_t temp_sin;
int addr_err = gdnsd_anysin_getaddrinfo(first_addr_txt, NULL, &temp_sin);
if(addr_err)
log_fatal("plugin_weighted: resource '%s' (direct): group '%s': item '%s': could not parse '%s' as an IP address: %s", res->name, first_name, lb_name, first_addr_txt, gai_strerror(addr_err));
if(temp_sin.sa.sa_family == AF_INET6) {
res->addrs_v6 = calloc(1, sizeof(addrset_t));
config_addrset(res->name, "direct", true, res->addrs_v6, res_cfg);
}
else {
dmn_assert(temp_sin.sa.sa_family == AF_INET);
res->addrs_v4 = calloc(1, sizeof(addrset_t));
config_addrset(res->name, "direct", false, res->addrs_v4, res_cfg);
}
}
else if(vscf_is_array(first_cfg)) { // ungrouped address, or cnames
const vscf_data_t* first_ac = vscf_array_get_data(first_cfg, 0);
if(!first_ac || !vscf_is_simple(first_ac))
log_fatal("plugin_weighted: resource '%s' (direct): item '%s': first element of array should be an IP address or CNAME string", res->name, first_name);
dmn_anysin_t temp_sin;
if(gdnsd_anysin_getaddrinfo(vscf_simple_get_data(first_ac), NULL, &temp_sin)) {
// was not a valid address, try cnames mode
res->cnames = calloc(1, sizeof(cnset_t));
config_cnameset(res->name, "direct", res->cnames, res_cfg);
}
else {
// was a valid address, try addrset mode
if(temp_sin.sa.sa_family == AF_INET6) {
res->addrs_v6 = calloc(1, sizeof(addrset_t));
config_addrset(res->name, "direct", true, res->addrs_v6, res_cfg);
}
else {
dmn_assert(temp_sin.sa.sa_family == AF_INET);
res->addrs_v4 = calloc(1, sizeof(addrset_t));
config_addrset(res->name, "direct", false, res->addrs_v4, res_cfg);
}
}
}
else {
log_fatal("plugin_weighted: resource '%s' (direct): item '%s': resource type not detectable (should be array of [ IP, weight ], array of [ CNAME, weight ], or hashed address group ...)", res->name, first_name);
}
vscf_destroy(res_cfg_noparams);
}