internal-connections.c 8.14 KB
Newer Older
Linus Tolke Y's avatar
Linus Tolke Y committed
1
/*
2
 * $Id: internal-connections.c,v 0.22 1996/06/14 15:49:40 byers Exp $
Per Cederqvist's avatar
Per Cederqvist committed
3
 * Copyright (C) 1991, 1992, 1993, 1994  Lysator Academic Computer Association.
Linus Tolke Y's avatar
Linus Tolke Y committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM 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 1, or (at your option) 
 * any later version.
 * 
 * LysKOM 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 LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
Per Cederqvist's avatar
Per Cederqvist committed
25 26 27 28 29 30
/*
 * internal-connections.c
 *
 * Abstract routines on the data type Connection.
 */

31
static char *rcsid = "$Id: internal-connections.c,v 0.22 1996/06/14 15:49:40 byers Exp $";
32 33
#include "rcs.h"
USE(rcsid);
Per Cederqvist's avatar
Per Cederqvist committed
34

Per Cederqvist's avatar
Per Cederqvist committed
35 36 37
#include <stdio.h>
#include <time.h>
#include <setjmp.h>
Per Cederqvist's avatar
Per Cederqvist committed
38
#include <sys/types.h>
39 40 41
#ifdef HAVE_STDARG_H
#  include <stdarg.h>
#endif
Per Cederqvist's avatar
Per Cederqvist committed
42

Per Cederqvist's avatar
Per Cederqvist committed
43
#include "exp.h"
Per Cederqvist's avatar
Per Cederqvist committed
44 45
#include "s-string.h"
#include "kom-types.h"
Per Cederqvist's avatar
Per Cederqvist committed
46 47 48 49
#include "com.h"
#include "connections.h"
#include "internal-connections.h"
#include "config.h"
Per Cederqvist's avatar
Per Cederqvist committed
50 51
#include "server/smalloc.h"
#include "lyskomd.h"
52
#include "log.h"
53
#include "async.h"
54
#include "kom-memory.h"
Per Cederqvist's avatar
Per Cederqvist committed
55 56

INTERNAL  Connection  *all_connections   = NULL;
57
INTERNAL  Session_no   no_of_connection_attempts = 0;
Per Cederqvist's avatar
Per Cederqvist committed
58 59 60 61 62

/* Used in get_conn_by_number to speed things up. */

INTERNAL  Connection  *last_conn = NULL;

63 64
static int  no_of_allocated_connections = 0;

65 66 67
static void
init_connection(Connection *conn)
{
68 69 70
    Async default_want_async[] = ASYNC_DEFAULT_MESSAGES;
    int i;
    
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
    conn->magic = 0;
    conn->prev = NULL;
    conn->next = NULL;
    conn->pers_no = 0;
    conn->person = NULL;
    conn->session_start = NO_TIME;
    conn->cwc = 0;
    conn->what_am_i_doing = EMPTY_STRING;
    conn->ena_level = 0;
    conn->username = EMPTY_STRING;
    conn->hostname = EMPTY_STRING;
    conn->ident_user = EMPTY_STRING;
    conn->client_name = EMPTY_STRING;
    conn->client_version = EMPTY_STRING;
    conn->invisible = FALSE;
    conn->username_valid = FALSE;
    conn->mux = NULL;
    conn->protocol = '\0';
    conn->parse_pos = 0;
    conn->fnc_parse_pos = 0;
    conn->array_parse_pos = 0;
    conn->struct_parse_pos = 0;
    conn->string_parse_pos = 0;
94
    conn->info_parse_pos = 0;
95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
    conn->ref_no = 0;
    conn->function = call_fnc_login_old;
    conn->num0 = 0;
    conn->num1 = 0;
    conn->num2 = 0;
    conn->num3 = 0;
    conn->c_string0 = EMPTY_STRING;
    conn->c_string1 = EMPTY_STRING;
    conn->string0 = EMPTY_STRING;
    conn->c_misc_info_p = NULL;
    conn->c_local_text_no_p = NULL;
    conn->unparsed = EMPTY_STRING;
    conn->first_to_parse = 0;
    conn->more_to_parse = FALSE;
    conn->last_request = NO_TIME;
    conn->session_no = 0;

112 113 114 115 116 117 118
    conn->info.pers_pres_conf = 0;
    conn->info.conf_pres_conf = 0;
    conn->info.motd_conf = 0;
    conn->info.kom_news_conf = 0;
    conn->info.motd_of_lyskom = 0;
    conn->info.version = 0;

119 120 121 122 123 124 125 126 127 128 129
    conn->num_list.length = 0;
    conn->num_list.data = NULL;

    for (i = 0; i < ay_dummy_last; i++)
        conn->want_async[i] = 0;
    
    for (i = 0;
         i < sizeof(default_want_async)/sizeof(*default_want_async);
         i++)
        conn->want_async[default_want_async[i]] = 1;

130 131 132 133 134 135
    init_priv_bits(&conn->priv_bits);
    init_conf_type(&conn->conf_type);
    init_struct_tm(&conn->time);
}

static Connection *
Per Cederqvist's avatar
Per Cederqvist committed
136 137 138 139 140
alloc_connection(void)
{
    Connection *res;
    
    res = smalloc ( sizeof(Connection) );
141
    init_connection(res);
142
    ++no_of_allocated_connections;
Per Cederqvist's avatar
Per Cederqvist committed
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
    return res;
}

EXPORT  Connection *
new_client(void)
{
    Connection		*c;

    c = alloc_connection();

    c->magic = CONN_MAGIC_ALLOC;
    
    if (all_connections != NULL)
    {
	all_connections->prev->next = c;
	c->prev = all_connections->prev;
	all_connections->prev = c;
	c->next = all_connections;
    }
    else
    {
	c->prev = c;
	c->next = c;
    }

    all_connections = c;
    
    c->session_no = ++no_of_connection_attempts;
171
    c->protocol = '\0';      /* Reserved to mean 'no protocol specified yet' */
Per Cederqvist's avatar
Per Cederqvist committed
172 173 174 175 176 177 178 179 180 181 182
    c->unparsed = EMPTY_STRING;
    c->first_to_parse = 0;
    c->more_to_parse = TRUE;
    c->last_request = NO_TIME;
    c->pers_no = 0;
    c->person = NULL;
    time( & c->session_start );
    c->cwc = 0;
    c->what_am_i_doing = EMPTY_STRING;
    c->ena_level = 0;
    c->username = EMPTY_STRING;
183
    c->ident_user = EMPTY_STRING;
184 185
    c->client_name = EMPTY_STRING;
    c->client_version = EMPTY_STRING;
186
    c->invisible = FALSE;
187
    c->username_valid = FALSE;
188

Per Cederqvist's avatar
Per Cederqvist committed
189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
    return c;
}

/*
 * Only used from logout_client
 */
EXPORT  void
kill_client(Connection *cp)    
{
    if ( all_connections == NULL )
	restart_kom("kill_client(): No clients in all_connections list\n");
    
    if (all_connections == all_connections->next)
    {
	if (all_connections->prev != all_connections)
	    restart_kom("kill_client(): all_connections corrupt (LINK)\n");

	if (all_connections != cp)
	    restart_kom("kill_client(): all_connections corrupt (SINGLE)\n");
      
	all_connections = NULL;
    }
    else
    {
	if (cp->prev == NULL || cp->next == NULL)
	    restart_kom("kill_client(): all_connections corrupt (NULL)\n");
      
	cp->prev->next = cp->next;
	cp->next->prev = cp->prev;
	
	if (all_connections == cp)
	    all_connections = cp->next;
    }

    if ( last_conn == cp )
	last_conn = NULL;

    cp->magic = CONN_MAGIC_FREE;
227 228 229 230 231

    s_clear(&cp->unparsed);
    s_clear(&cp->what_am_i_doing);
    s_clear(&cp->username);
    s_clear(&cp->hostname);
232
    s_clear(&cp->ident_user);
233 234
    s_clear(&cp->client_name);
    s_clear(&cp->client_version);
235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250

    if ( cp->mux != NULL )
    {
	log("kill_client(): client %d has mux != NULL.\n",
	    cp->session_no);
    }

    if ( !s_empty(cp->c_string0) || !s_empty(cp->c_string1)
	|| !s_empty(cp->string0) )
    {
	log("kill_client(): unexpected string remains.\n");
    }

    if ( cp->c_misc_info_p != NULL || cp->c_local_text_no_p != NULL )
	log("kill_client(): unexpected remaining data.\n");

Per Cederqvist's avatar
Per Cederqvist committed
251
    sfree(cp);
252
    --no_of_allocated_connections;
Per Cederqvist's avatar
Per Cederqvist committed
253 254
}

255
#ifndef NDEFENSIVE_CHECKS
Per Cederqvist's avatar
Per Cederqvist committed
256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274

INTERNAL  void
check_conn_exists(Connection *foo)
{
    /* Check that foo really is active. */

    Connection *c = all_connections;
    Bool found = FALSE;

    do
    {
	if ( c == foo )
	    found = TRUE;

	c = c->next;
    }
    while ( c != all_connections && found == FALSE );

    if ( found == FALSE )
Per Cederqvist's avatar
Per Cederqvist committed
275 276 277
	restart_kom("%s: foo == %d not found in all_connections.\n", 
		    "get_conn_by_number",
		    last_conn->session_no);
Per Cederqvist's avatar
Per Cederqvist committed
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293
}

#endif

/*
 * Session_nos must NOT be recycled, or this code might break!
 */
EXPORT  Connection *
get_conn_by_number (Session_no session_no)
{
    Connection *end;

    if ( last_conn == NULL )
	last_conn = all_connections;
    else if ( all_connections == NULL )
    {
Per Cederqvist's avatar
Per Cederqvist committed
294 295 296 297
	restart_kom("get_conn_by_number(%d): last_conn = %d %s",
		    session_no,
		    last_conn->session_no,
		    "and all_connections == NULL");
Per Cederqvist's avatar
Per Cederqvist committed
298
    }
299
#ifndef NDEFENSIVE_CHECKS
Per Cederqvist's avatar
Per Cederqvist committed
300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
    else
	check_conn_exists(last_conn);
#endif

    end = last_conn;

    do
    {
	if ( last_conn->session_no == session_no )
	    return last_conn;

	last_conn = last_conn->next;
    }
    while ( last_conn != end);

    return NULL;
}


EXPORT  Session_no
traverse_connections (Session_no session_no)
{
    Connection *prev = NULL;

    if ( all_connections == NULL )
	return 0;

    prev = get_conn_by_number ( session_no );

    /* prev is NULL if session_no is 0, or if session_no was logged out. */

    if ( prev == NULL )
	return all_connections->session_no;
    else if ( prev->next == all_connections )
	return 0;		/* Full circle. */
    else
	return prev->next->session_no;
}
338 339 340 341

void
dump_allocated_connections(FILE *fp)
{
Per Cederqvist's avatar
Per Cederqvist committed
342 343
    fprintf(fp, "---%s:\n\tConnections:      %d\n",
	    __FILE__,
344
	    no_of_allocated_connections);
Per Cederqvist's avatar
Per Cederqvist committed
345 346
    fprintf(fp, "\tConnection attempts:	%lu\n",
	    (unsigned long)no_of_connection_attempts);
347
}