1 files changed, 143 insertions, 0 deletions
diff --git a/modules/m_svinfo.c b/modules/m_svinfo.c
new file mode 100644
index 0000000..bb36887
--- /dev/null
+++ b/modules/m_svinfo.c
@@ -0,0 +1,143 @@
+/*
+ *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
+ *  m_svinfo.c: Sends TS information for clock & compatibility checks.
+ *
+ *  Copyright (C) 2002 by the past and present ircd coders, and others.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ *  USA
+ *
+ *  $Id$
+ */
+
+#include "stdinc.h"
+#include "client.h"
+#include "irc_string.h"
+#include "ircd.h"
+#include "numeric.h"
+#include "send.h"
+#include "conf.h"
+#include "log.h"
+#include "parse.h"
+#include "modules.h"
+
+
+/*
+ * ms_svinfo - SVINFO message handler
+ *      parv[0] = sender prefix
+ *      parv[1] = TS_CURRENT for the server
+ *      parv[2] = TS_MIN for the server
+ *      parv[3] = server is standalone or connected to non-TS only
+ *      parv[4] = server's idea of UTC time
+ */
+static void
+ms_svinfo(struct Client *client_p, struct Client *source_p,
+          int parc, char *parv[])
+{
+  time_t deltat;
+  time_t theirtime;
+
+  if (MyConnect(source_p) && IsUnknown(source_p))
+  {
+    exit_client(source_p, source_p, "Need SERVER before SVINFO");
+    return;
+  }
+
+  if (!IsServer(source_p) || !MyConnect(source_p) || parc < 5)
+    return;
+
+  if (TS_CURRENT < atoi(parv[2]) || atoi(parv[1]) < TS_MIN)
+  {
+    /*
+     * a server with the wrong TS version connected; since we're
+     * TS_ONLY we can't fall back to the non-TS protocol so
+     * we drop the link  -orabidoo
+     */
+    sendto_realops_flags(UMODE_ALL, L_ADMIN,
+            "Link %s dropped, wrong TS protocol version (%s,%s)",
+            get_client_name(source_p, SHOW_IP), parv[1], parv[2]);
+    sendto_realops_flags(UMODE_ALL, L_OPER,
+                 "Link %s dropped, wrong TS protocol version (%s,%s)",
+                 get_client_name(source_p, MASK_IP), parv[1], parv[2]);
+    exit_client(source_p, source_p, "Incompatible TS version");
+    return;
+  }
+
+  /*
+   * since we're here, might as well set CurrentTime while we're at it
+   */
+  set_time(); 
+  theirtime = atol(parv[4]);
+  deltat = abs(theirtime - CurrentTime);
+
+  if (deltat > ConfigFileEntry.ts_max_delta)
+  {
+    sendto_realops_flags(UMODE_ALL, L_ADMIN,
+          "Link %s dropped, excessive TS delta (my TS=%lu, their TS=%lu, delta=%d)",
+          get_client_name(source_p, SHOW_IP),
+          (unsigned long) CurrentTime,
+          (unsigned long) theirtime,
+          (int) deltat);
+    sendto_realops_flags(UMODE_ALL, L_OPER,
+          "Link %s dropped, excessive TS delta (my TS=%lu, their TS=%lu, delta=%d)",
+           get_client_name(source_p, MASK_IP),
+           (unsigned long) CurrentTime,
+           (unsigned long) theirtime,
+           (int) deltat);
+    ilog(LOG_TYPE_IRCD,
+         "Link %s dropped, excessive TS delta (my TS=%lu, their TS=%lu, delta=%d)",
+         get_client_name(source_p, SHOW_IP),
+         (unsigned long) CurrentTime,
+         (unsigned long) theirtime,
+         (int) deltat);
+    exit_client(source_p, source_p, "Excessive TS delta");
+    return;
+  }
+
+  if (deltat > ConfigFileEntry.ts_warn_delta)
+    sendto_realops_flags(UMODE_ALL, L_ALL,
+                "Link %s notable TS delta (my TS=%lu, their TS=%lu, delta=%d)",
+                source_p->name,
+                (unsigned long) CurrentTime,
+                (unsigned long) theirtime,
+                (int) deltat);
+}
+
+static struct Message svinfo_msgtab = {
+  "SVINFO", 0, 0, 4, MAXPARA, MFLG_SLOW, 0,
+  {m_unregistered, m_ignore, ms_svinfo, m_ignore, m_ignore, m_ignore}
+};
+
+static void
+module_init(void)
+{
+  mod_add_cmd(&svinfo_msgtab);
+}
+
+static void
+module_exit(void)
+{
+  mod_del_cmd(&svinfo_msgtab);
+}
+
+struct module module_entry = {
+  .node    = { NULL, NULL, NULL },
+  .name    = NULL,
+  .version = "$Revision$",
+  .handle  = NULL,
+  .modinit = module_init,
+  .modexit = module_exit,
+  .flags   = 0
+};