1 files changed, 217 insertions, 0 deletions
diff --git a/ktalkd/ktalkd/table.cpp b/ktalkd/ktalkd/table.cpp
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+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or
+ *    without modification, are permitted provided that the following
+ *    conditions are met:
+ *
+ *    - Redistributions of source code must retain the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer.
+ *
+ *    - Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials
+ *      provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
+ *    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ *    PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR
+ *    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ *    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ *    TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ *    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ *    THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * (BSD License, from kdelibs/doc/common/bsd-license.html)
+ */
+
+/*
+ * Routines to handle insertion, deletion, etc on the table
+ * of requests kept by the daemon. Nothing fancy here, linear
+ * search on a double-linked list. A time is kept with each
+ * entry so that overly old invitations can be eliminated.
+ */
+
+#include "table.h"
+#include <sys/param.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <syslog.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include "proto.h"
+#include "defs.h"
+#include "machines/forwmach.h"
+
+#define MAX_ID 16000	/* << 2^15 so I don't have sign troubles */
+
+#define NIL ((TABLE_ENTRY *)0)
+
+/*
+ * Look in the table for an invitation that matches the current
+ * request looking for an invitation
+ */
+NEW_CTL_MSG * KTalkdTable::find_match(NEW_CTL_MSG *request)
+{
+    register TABLE_ENTRY *ptr;
+    time_t current_time;
+
+    (void) gettimeofday(&tp, &txp);
+    current_time = tp.tv_sec;
+    for (ptr = table; ptr != NIL; ptr = ptr->next) {
+        if ((ptr->time - current_time) > MAX_LIFE) {
+            /* the entry is too old */
+            ktalk_debug("deleting expired entry : id %d",
+                     ptr->request.id_num);
+            delete_entry(ptr);
+            continue;
+        }
+        if ((strcmp(request->l_name, ptr->request.r_name) == 0) &&
+            (strcmp(request->r_name, ptr->request.l_name) == 0) &&
+            (ptr->request.type == LEAVE_INVITE) && (ptr->fwm == 0L))
+        {   /* Not the forw. machines : they aren't stored to match LOOK_UPs */
+            ktalk_debug("Found match : id %d", ptr->request.id_num);
+            return (&ptr->request);
+        }
+    }
+    return ((NEW_CTL_MSG *)0);
+}
+
+/*
+ * Look for an identical request, as opposed to a complimentary
+ * one as find_match does
+ */
+NEW_CTL_MSG * KTalkdTable::find_request(NEW_CTL_MSG *request)
+{
+    register TABLE_ENTRY *ptr;
+    time_t current_time;
+
+    (void) gettimeofday(&tp, &txp);
+    current_time = tp.tv_sec;
+    /*
+     * See if this is a repeated message, and check for
+     * out of date entries in the table while we are it.
+     */
+    for (ptr = table; ptr != NIL; ptr = ptr->next) {
+        if ((ptr->time - current_time) > MAX_LIFE) {
+            /* the entry is too old */
+            ktalk_debug("deleting expired entry : id %d",
+                     ptr->request.id_num);
+            delete_entry(ptr);
+            continue;
+        }
+        if (strcmp(request->r_name, ptr->request.r_name) == 0 &&
+            strcmp(request->l_name, ptr->request.l_name) == 0 &&
+            request->type == ptr->request.type &&
+            request->pid == ptr->request.pid) {
+            /* update the time if we 'touch' it */
+            ptr->time = current_time;
+            ktalk_debug("Found identical request : id %d", ptr->request.id_num);
+            return (&ptr->request);
+        }
+    }
+    return ((NEW_CTL_MSG *)0);
+}
+
+void KTalkdTable::insert_table(NEW_CTL_MSG *request, NEW_CTL_RESPONSE *response, ForwMachine * fwm)
+{
+    register TABLE_ENTRY *ptr;
+    time_t current_time;
+
+    gettimeofday(&tp, &txp);
+    current_time = tp.tv_sec;
+    request->id_num = new_id();
+    ktalk_debug("Stored as id %d",request->id_num);
+    if (response != 0L) response->id_num = htonl(request->id_num);
+    /* insert a new entry into the top of the list */
+    ptr = new TABLE_ENTRY;
+    if (ptr == NIL) {
+        syslog(LOG_ERR, "insert_table: Out of memory");
+        _exit(1);
+    }
+    ptr->fwm = fwm;
+    ptr->time = current_time;
+    ptr->request = *request;
+    ptr->next = table;
+    if (ptr->next != NIL)
+        ptr->next->last = ptr;
+    ptr->last = NIL;
+    table = ptr;
+}
+
+/*
+ * Generate a unique non-zero sequence number
+ */
+int KTalkdTable::new_id()
+{
+    static int current_id = 0;
+
+    current_id = (current_id + 1) % MAX_ID;
+    /* 0 is reserved, helps to pick up bugs */
+    if (current_id == 0)
+        current_id = 1;
+    return (current_id);
+}
+
+/*
+ * Delete the invitation with id 'id_num'
+ */
+int KTalkdTable::delete_invite(uint32_t id_num)
+{
+    register TABLE_ENTRY *ptr;
+
+    ptr = table;
+    ktalk_debug("delete_invite(%d)", id_num);
+    for (ptr = table; ptr != NIL; ptr = ptr->next) {
+        if (ptr->request.id_num == id_num)
+            break;
+    }
+    if (ptr != NIL) {
+        if (ptr->fwm) {
+            ptr->fwm->sendDelete(); // Calls processDelete() in the child process.
+        }
+        ktalk_debug("Deleted : id %d", ptr->request.id_num);
+        delete_entry(ptr);
+        return (SUCCESS);
+    }
+    return (NOT_HERE);
+}
+
+/*
+ * Classic delete from a double-linked list
+ */
+void KTalkdTable::delete_entry(register TABLE_ENTRY *ptr)
+{
+    if (table == ptr)
+        table = ptr->next;
+    else if (ptr->last != NIL)
+        ptr->last->next = ptr->next;
+    if (ptr->next != NIL)
+        ptr->next->last = ptr->last;
+    delete ptr;
+}
+
+KTalkdTable::~KTalkdTable()
+{
+      register TABLE_ENTRY *ptr;
+      ptr = table;
+      ktalk_debug("final_clean()");
+      for (ptr = table; ptr != 0L; ptr = ptr->next) {
+          if (ptr->fwm != 0L)
+          {
+              ktalk_debug("CLEAN : Found a forwarding machine to clean : id %d",ptr->request.id_num);
+              delete ptr->fwm;
+          }
+          ktalk_debug("CLEAN : Deleting id %d", ptr->request.id_num);
+          delete_entry(ptr);
+      }
+}