boinc/html/user/host_venue_action.php

<?php
    require_once("db.inc");
    require_once("util.inc");

    db_init();

    $user = get_logged_in_user();

    $venue = $_GET["venue"];
    $hostid = $_GET["hostid"];

    $result = mysql_query("select * from host where id = $hostid");
    $host = mysql_fetch_object($result);
    mysql_free_result($result);

    if (!$host) {
        echo "Couldn't find host.";
        exit();
    }
    if ($host->userid != $user->id) {
        echo "Not your host\n";
        exit();
    }

    $retval = mysql_query("update host set venue='$venue' where id = $hostid");
    if ($retval) {
        Header("Location: show_host_detail.php?hostid=$hostid");
    } else {
        db_error_page();
    }
?>