mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
236 lines
6.1 KiB
C
236 lines
6.1 KiB
C
/*
|
|
* Copyright (c) 1983, 1993
|
|
* The 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:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)table.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Consider this a mis-guided attempt at modularity
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
#include <protocols/talkd.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#define MAX_ID 16000 /* << 2^15 so I don't have sign troubles */
|
|
|
|
#define NIL ((TABLE_ENTRY *)0)
|
|
|
|
extern int debug;
|
|
struct timeval tp;
|
|
struct timezone txp;
|
|
|
|
typedef struct table_entry TABLE_ENTRY;
|
|
|
|
struct table_entry {
|
|
CTL_MSG request;
|
|
long time;
|
|
TABLE_ENTRY *next;
|
|
TABLE_ENTRY *last;
|
|
};
|
|
|
|
TABLE_ENTRY *table = NIL;
|
|
CTL_MSG *find_request();
|
|
CTL_MSG *find_match();
|
|
|
|
/*
|
|
* Look in the table for an invitation that matches the current
|
|
* request looking for an invitation
|
|
*/
|
|
CTL_MSG *
|
|
find_match(request)
|
|
register CTL_MSG *request;
|
|
{
|
|
register TABLE_ENTRY *ptr;
|
|
time_t current_time;
|
|
|
|
gettimeofday(&tp, &txp);
|
|
current_time = tp.tv_sec;
|
|
if (debug)
|
|
print_request("find_match", request);
|
|
for (ptr = table; ptr != NIL; ptr = ptr->next) {
|
|
if ((ptr->time - current_time) > MAX_LIFE) {
|
|
/* the entry is too old */
|
|
if (debug)
|
|
print_request("deleting expired entry",
|
|
&ptr->request);
|
|
delete(ptr);
|
|
continue;
|
|
}
|
|
if (debug)
|
|
print_request("", &ptr->request);
|
|
if (strcmp(request->l_name, ptr->request.r_name) == 0 &&
|
|
strcmp(request->r_name, ptr->request.l_name) == 0 &&
|
|
ptr->request.type == LEAVE_INVITE)
|
|
return (&ptr->request);
|
|
}
|
|
return ((CTL_MSG *)0);
|
|
}
|
|
|
|
/*
|
|
* Look for an identical request, as opposed to a complimentary
|
|
* one as find_match does
|
|
*/
|
|
CTL_MSG *
|
|
find_request(request)
|
|
register CTL_MSG *request;
|
|
{
|
|
register TABLE_ENTRY *ptr;
|
|
time_t current_time;
|
|
|
|
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.
|
|
*/
|
|
if (debug)
|
|
print_request("find_request", request);
|
|
for (ptr = table; ptr != NIL; ptr = ptr->next) {
|
|
if ((ptr->time - current_time) > MAX_LIFE) {
|
|
/* the entry is too old */
|
|
if (debug)
|
|
print_request("deleting expired entry",
|
|
&ptr->request);
|
|
delete(ptr);
|
|
continue;
|
|
}
|
|
if (debug)
|
|
print_request("", &ptr->request);
|
|
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;
|
|
return (&ptr->request);
|
|
}
|
|
}
|
|
return ((CTL_MSG *)0);
|
|
}
|
|
|
|
insert_table(request, response)
|
|
CTL_MSG *request;
|
|
CTL_RESPONSE *response;
|
|
{
|
|
register TABLE_ENTRY *ptr;
|
|
time_t current_time;
|
|
|
|
gettimeofday(&tp, &txp);
|
|
current_time = tp.tv_sec;
|
|
request->id_num = new_id();
|
|
response->id_num = htonl(request->id_num);
|
|
/* insert a new entry into the top of the list */
|
|
ptr = (TABLE_ENTRY *)malloc(sizeof(TABLE_ENTRY));
|
|
if (ptr == NIL) {
|
|
syslog(LOG_ERR, "insert_table: Out of memory");
|
|
_exit(1);
|
|
}
|
|
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
|
|
*/
|
|
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'
|
|
*/
|
|
delete_invite(id_num)
|
|
int id_num;
|
|
{
|
|
register TABLE_ENTRY *ptr;
|
|
|
|
ptr = table;
|
|
if (debug)
|
|
syslog(LOG_DEBUG, "delete_invite(%d)", id_num);
|
|
for (ptr = table; ptr != NIL; ptr = ptr->next) {
|
|
if (ptr->request.id_num == id_num)
|
|
break;
|
|
if (debug)
|
|
print_request("", &ptr->request);
|
|
}
|
|
if (ptr != NIL) {
|
|
delete(ptr);
|
|
return (SUCCESS);
|
|
}
|
|
return (NOT_HERE);
|
|
}
|
|
|
|
/*
|
|
* Classic delete from a double-linked list
|
|
*/
|
|
delete(ptr)
|
|
register TABLE_ENTRY *ptr;
|
|
{
|
|
|
|
if (debug)
|
|
print_request("delete", &ptr->request);
|
|
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;
|
|
free((char *)ptr);
|
|
}
|