source/smbd/conn.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Manage connections_struct structures
   5    Copyright (C) Andrew Tridgell 1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25
  26 /* set these to define the limits of the server. NOTE These are on a
  27    per-client basis. Thus any one machine can't connect to more than
  28    MAX_CONNECTIONS services, but any number of machines may connect at
  29    one time. */
  30 #define MAX_CONNECTIONS 128
  31
  32 static connection_struct *Connections;
  33
  34 /* number of open connections */
  35 static struct bitmap *bmap;
  36 static int num_open;
  37
  38 /****************************************************************************
  39 init the conn structures
  40 ****************************************************************************/
  41 void conn_init(void)
  42 {
  43         bmap = bitmap_allocate(MAX_CONNECTIONS);
  44 }
  45
  46 /****************************************************************************
  47 return the number of open connections
  48 ****************************************************************************/
  49 int conn_num_open(void)
  50 {
  51         return num_open;
  52 }
  53
  54
  55 /****************************************************************************
  56 check if a snum is in use
  57 ****************************************************************************/
  58 BOOL conn_snum_used(int snum)
  59 {
  60         connection_struct *conn;
  61         for (conn=Connections;conn;conn=conn->next) {
  62                 if (conn->service == snum) {
  63                         return(True);
  64                 }
  65         }
  66         return(False);
  67 }
  68
  69
  70 /****************************************************************************
  71 find a conn given a cnum
  72 ****************************************************************************/
  73 connection_struct *conn_find(int cnum)
  74 {
  75         int count=0;
  76         connection_struct *conn;
  77
  78         for (conn=Connections;conn;conn=conn->next,count++) {
  79                 if (conn->cnum == cnum) {
  80                         if (count > 10) {
  81                                 DLIST_PROMOTE(Connections, conn);
  82                         }
  83                         return conn;
  84                 }
  85         }
  86
  87         return NULL;
  88 }
  89
  90
  91 /****************************************************************************
  92   find first available connection slot, starting from a random position.
  93 The randomisation stops problems with the server dieing and clients
  94 thinking the server is still available.
  95 ****************************************************************************/
  96 connection_struct *conn_new(void)
  97 {
  98         connection_struct *conn;
  99         int i;
 100
 101         i = bitmap_find(bmap, 1);
 102
 103         if (i == -1) {
 104                 DEBUG(1,("ERROR! Out of connection structures\n"));
 105                 return NULL;
 106         }
 107
 108         conn = (connection_struct *)malloc(sizeof(*conn));
 109         if (!conn) return NULL;
 110
 111         ZERO_STRUCTP(conn);
 112         conn->cnum = i;
 113         conn->smbd_pid = getpid();
 114
 115         bitmap_set(bmap, i);
 116
 117         num_open++;
 118
 119         string_init(&conn->user,"");
 120         string_init(&conn->dirpath,"");
 121         string_init(&conn->connectpath,"");
 122         string_init(&conn->origpath,"");
 123
 124         DLIST_ADD(Connections, conn);
 125
 126         return conn;
 127 }
 128
 129 /****************************************************************************
 130 close all conn structures
 131 ****************************************************************************/
 132 void conn_close_all(void)
 133 {
 134         connection_struct *conn, *next;
 135         for (conn=Connections;conn;conn=next) {
 136                 next=conn->next;
 137                 close_cnum(conn, (uint16)-1);
 138         }
 139 }
 140
 141 /****************************************************************************
 142 idle inactive connections
 143 ****************************************************************************/
 144 BOOL conn_idle_all(time_t t, int deadtime)
 145 {
 146         BOOL allidle = True;
 147         connection_struct *conn, *next;
 148
 149         for (conn=Connections;conn;conn=next) {
 150                 next=conn->next;
 151                 /* close dirptrs on connections that are idle */
 152                 if ((t-conn->lastused) > DPTR_IDLE_TIMEOUT)
 153                         dptr_idlecnum(conn);
 154
 155                 if (conn->num_files_open > 0 ||
 156                     (t-conn->lastused)<deadtime)
 157                         allidle = False;
 158         }
 159
 160         return allidle;
 161 }
 162
 163 /****************************************************************************
 164 free a conn structure
 165 ****************************************************************************/
 166 void conn_free(connection_struct *conn)
 167 {
 168         DLIST_REMOVE(Connections, conn);
 169
 170         if (conn->ngroups && conn->groups) {
 171                 free(conn->groups);
 172                 conn->groups = NULL;
 173                 conn->ngroups = 0;
 174         }
 175
 176         free_namearray(conn->veto_list);
 177         free_namearray(conn->hide_list);
 178         free_namearray(conn->veto_oplock_list);
 179
 180         string_free(&conn->user);
 181         string_free(&conn->dirpath);
 182         string_free(&conn->connectpath);
 183         string_free(&conn->origpath);
 184
 185         bitmap_clear(bmap, conn->cnum);
 186         num_open--;
 187
 188         ZERO_STRUCTP(conn);
 189         free(conn);
 190 }