F_NONNULL
static void do_lookup(const gdmaps_t* gdmaps, const char* map_name, const char* ip_arg) {
dmn_assert(gdmaps); dmn_assert(map_name); dmn_assert(ip_arg);
int map_idx = gdmaps_name2idx(gdmaps, map_name);
if(map_idx < 0) {
log_err("Mapping name '%s' not found in configuration", map_name);
return;
}
client_info_t cinfo;
// mostly ignored, but needs to be nonzero, and 150 is interesting in that
// it easily differentiates source -> scope copies from actual database scope netmasks,
// since it's larger than any legal netmask in the database.
cinfo.edns_client_mask = 150U;
const int addr_err = gdnsd_anysin_getaddrinfo(ip_arg, NULL, &cinfo.edns_client);
if(addr_err) {
log_err("Could not parse address '%s': %s", ip_arg, gai_strerror(addr_err));
return;
}
// To void gdmaps fallback pitfalls
memcpy(&cinfo.dns_source, &cinfo.edns_client, sizeof(dmn_anysin_t));
// w/ edns_client_mask set, scope_mask should *always* be set by gdmaps_lookup();
// (and regardless, dclist should also always be set and contain something)
unsigned scope_mask = 175U;
const uint8_t* dclist = gdmaps_lookup(gdmaps, map_idx, &cinfo, &scope_mask);
dmn_assert(scope_mask != 175U);
dmn_assert(dclist);
// Scope was set to Source. Since we always query as edns, this implies
// the database was V4-only and the address input was a non-v4-compat v6 address,
// and the lookup code fell back to the default dclist (1).
if(scope_mask == 150U) {
printf(
"%s => %s => %s\n",
map_name, dmn_logf_anysin_noport(&cinfo.edns_client),
gdmaps_logf_dclist(gdmaps, map_idx, dclist)
);
}
else {
printf(
"%s => %s/%u => %s\n",
map_name, dmn_logf_anysin_noport(&cinfo.edns_client), scope_mask,
gdmaps_logf_dclist(gdmaps, map_idx, dclist)
);
}
dmn_fmtbuf_reset();
}
const char* gdnsd_logf_ipv6(const uint8_t* ipv6) {
dmn_anysin_t tempsin;
memset(&tempsin, 0, sizeof(dmn_anysin_t));
tempsin.sin.sin_family = AF_INET6;
memcpy(tempsin.sin6.sin6_addr.s6_addr, ipv6, 16);
tempsin.len = sizeof(struct sockaddr_in6);
return dmn_logf_anysin_noport(&tempsin);
}