text: 
  #include "core/or/or.h"
  #include "core/mainloop/connection.h"
  #include "feature/control/control.h"
  #include "feature/control/getinfo_geoip.h"
  #include "lib/geoip/geoip.h"
  
  /** Helper used to implement GETINFO ip-to-country/... controller command. */
  int
  getinfo_helper_geoip(control_connection_t *control_conn,
                       const char *question, char **answer,
                       const char **errmsg)
  {
    (void)control_conn;
    if (!strcmpstart(question, "ip-to-country/")) {
      int c;
      sa_family_t family;
      tor_addr_t addr;
      question += strlen("ip-to-country/");
  
      if (!strcmp(question, "ipv4-available") ||
          !strcmp(question, "ipv6-available")) {
        family = !strcmp(question, "ipv4-available") ? AF_INET : AF_INET6;
        const int available = geoip_is_loaded(family);
        tor_asprintf(answer, "%d", !! available);
        return 0;
      }
  
      family = tor_addr_parse(&addr, question);
      if (family != AF_INET && family != AF_INET6) {
        *errmsg = "Invalid address family";
        return -1;
      }
      if (!geoip_is_loaded(family)) {
        *errmsg = "GeoIP data not loaded";
        return -1;
      }
      if (family == AF_INET)
        c = geoip_get_country_by_ipv4(tor_addr_to_ipv4h(&addr));
      else                      /* AF_INET6 */
        c = geoip_get_country_by_ipv6(tor_addr_to_in6(&addr));
      *answer = tor_strdup(geoip_get_country_name(c));
    }
    return 0;
  }
  