sys/netproto/ncp/ncp_subr.c

   1 /*
   2  * Copyright (c) 1999, Boris Popov
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *    This product includes software developed by Boris Popov.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/sys/netncp/ncp_subr.c,v 1.2.2.1 2001/02/22 08:54:11 bp Exp $
  33  * $DragonFly: src/sys/netproto/ncp/ncp_subr.c,v 1.11 2007/08/21 17:26:46 dillon Exp $
  34  */
  35 #include <sys/param.h>
  36 #include <sys/errno.h>
  37 #include <sys/proc.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41 #include <sys/time.h>
  42 #include <sys/uio.h>
  43 #include <sys/mbuf.h>
  44
  45 #include "ncp.h"
  46 #include "ncp_conn.h"
  47 #include "ncp_sock.h"
  48 #include "ncp_subr.h"
  49 #include "ncp_rq.h"
  50 #include "ncp_ncp.h"
  51 #include "nwerror.h"
  52
  53 int ncp_debuglevel = 0;
  54
  55 struct callout ncp_timer_handle;
  56
  57 static void ncp_at_exit(struct thread *td);
  58 static void ncp_timer(void *arg);
  59
  60 /*
  61  * duplicate string from user space. It should be very-very slow.
  62  */
  63 char *
  64 ncp_str_dup(const char *s)
  65 {
  66         const char *src;
  67         char *dst;
  68         char bt;
  69         int len = 0;
  70
  71         for (src = s; ;src++) {
  72                 if (copyin(src, &bt, 1)) return NULL;
  73                 len++;
  74                 if (bt == 0) break;
  75         }
  76         dst = kmalloc(len, M_NCPDATA, M_WAITOK);
  77         copyin(s, dst, len);
  78         return(dst);
  79 }
  80
  81
  82 void
  83 ncp_at_exit(struct thread *td)
  84 {
  85         struct ncp_conn *ncp, *nncp;
  86         struct ucred *cred;
  87
  88         KKASSERT(td->td_proc);
  89         cred = td->td_proc->p_ucred;
  90
  91         if (ncp_conn_putprochandles(td) == 0) return;
  92
  93         ncp_conn_locklist(LK_EXCLUSIVE, td);
  94         for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
  95                 nncp = SLIST_NEXT(ncp, nc_next);
  96                 if (ncp->ref_cnt != 0) continue;
  97                 if (ncp_conn_lock(ncp, td, cred, NCPM_READ|NCPM_EXECUTE|NCPM_WRITE))
  98                         continue;
  99                 if (ncp_disconnect(ncp) != 0)
 100                         ncp_conn_unlock(ncp, td);
 101         }
 102         ncp_conn_unlocklist(td);
 103 }
 104
 105 int
 106 ncp_init(void)
 107 {
 108         ncp_conn_init();
 109         if (at_exit(ncp_at_exit)) {
 110                 NCPFATAL("can't register at_exit handler\n");
 111                 return ENOMEM;
 112         }
 113         callout_init(&ncp_timer_handle);
 114         callout_reset(&ncp_timer_handle, NCP_TIMER_TICK, ncp_timer, NULL);
 115         return 0;
 116 }
 117
 118 void
 119 ncp_done(void)
 120 {
 121         struct ncp_conn *ncp, *nncp;
 122         struct thread *td = curthread;  /* XXX */
 123         struct ucred *cred;
 124
 125         KKASSERT(td->td_proc);
 126         cred = td->td_proc->p_ucred;
 127
 128         callout_stop(&ncp_timer_handle);
 129         rm_at_exit(ncp_at_exit);
 130         ncp_conn_locklist(LK_EXCLUSIVE, td);
 131         for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
 132                 nncp = SLIST_NEXT(ncp, nc_next);
 133                 ncp->ref_cnt = 0;
 134                 if (ncp_conn_lock(ncp, td, cred,NCPM_READ|NCPM_EXECUTE|NCPM_WRITE)) {
 135                         NCPFATAL("Can't lock connection !\n");
 136                         continue;
 137                 }
 138                 if (ncp_disconnect(ncp) != 0)
 139                         ncp_conn_unlock(ncp, td);
 140         }
 141         ncp_conn_unlocklist(td);
 142 }
 143
 144
 145 /* tick every second and check for watch dog packets and lost connections */
 146 static void
 147 ncp_timer(void *arg)
 148 {
 149         struct ncp_conn *conn;
 150
 151         if(ncp_conn_locklist(LK_SHARED | LK_NOWAIT, NULL) == 0) {
 152                 SLIST_FOREACH(conn, &conn_list, nc_next)
 153                         ncp_check_conn(conn);
 154                 ncp_conn_unlocklist(NULL);
 155         }
 156         callout_reset(&ncp_timer_handle, NCP_TIMER_TICK, ncp_timer, NULL);
 157 }
 158
 159 int
 160 ncp_get_bindery_object_id(struct ncp_conn *conn,
 161                 u_int16_t object_type, char *object_name,
 162                 struct ncp_bindery_object *target,
 163                 struct thread *td,struct ucred *cred)
 164 {
 165         int error;
 166         DECLARE_RQ;
 167
 168         NCP_RQ_HEAD_S(23,53,td,cred);
 169         ncp_rq_word_hl(rqp, object_type);
 170         ncp_rq_pstring(rqp, object_name);
 171         checkbad(ncp_request(conn,rqp));
 172         if (rqp->rpsize < 54) {
 173                 kprintf("ncp_rp_size %d < 54\n", rqp->rpsize);
 174                 error = EINVAL;
 175                 goto bad;
 176         }
 177         target->object_id = ncp_rp_dword_hl(rqp);
 178         target->object_type = ncp_rp_word_hl(rqp);
 179         ncp_rp_mem(rqp,(caddr_t)target->object_name, 48);
 180         NCP_RQ_EXIT;
 181         return error;
 182 }
 183
 184 int
 185 ncp_read(struct ncp_conn *conn, ncp_fh *file, struct uio *uiop, struct ucred *cred) {
 186         int error = 0, len = 0, retlen=0, tsiz, burstio;
 187         DECLARE_RQ;
 188
 189         tsiz = uiop->uio_resid;
 190 #ifdef NCPBURST
 191         burstio = (ncp_burst_enabled && tsiz > conn->buffer_size);
 192 #else
 193         burstio = 0;
 194 #endif
 195
 196         while (tsiz > 0) {
 197                 if (!burstio) {
 198                         len = min(4096 - (uiop->uio_offset % 4096), tsiz);
 199                         len = min(len, conn->buffer_size);
 200                         NCP_RQ_HEAD(72,uiop->uio_td,cred);
 201                         ncp_rq_byte(rqp, 0);
 202                         ncp_rq_mem(rqp, (caddr_t)file, 6);
 203                         ncp_rq_dword(rqp, htonl(uiop->uio_offset));
 204                         ncp_rq_word(rqp, htons(len));
 205                         checkbad(ncp_request(conn,rqp));
 206                         retlen = ncp_rp_word_hl(rqp);
 207                         if (uiop->uio_offset & 1)
 208                                 ncp_rp_byte(rqp);
 209                         error = nwfs_mbuftouio(&rqp->mrp,uiop,retlen,&rqp->bpos);
 210                         NCP_RQ_EXIT;
 211                 } else {
 212 #ifdef NCPBURST
 213                         error = ncp_burst_read(conn, file, tsiz, &len, &retlen, uiop, cred);
 214 #endif
 215                 }
 216                 if (error) break;
 217                 tsiz -= retlen;
 218                 if (retlen < len)
 219                         break;
 220         }
 221         return (error);
 222 }
 223
 224 int
 225 ncp_write(struct ncp_conn *conn, ncp_fh *file, struct uio *uiop, struct ucred *cred)
 226 {
 227         int error = 0, len, tsiz, backup;
 228         DECLARE_RQ;
 229
 230         if (uiop->uio_iovcnt != 1) {
 231                 kprintf("%s: can't handle iovcnt>1 !!!\n", __func__);
 232                 return EIO;
 233         }
 234         KKASSERT(uiop->uio_segflg != UIO_NOCOPY);
 235         tsiz = uiop->uio_resid;
 236         while (tsiz > 0) {
 237                 len = min(4096 - (uiop->uio_offset % 4096), tsiz);
 238                 len = min(len, conn->buffer_size);
 239                 if (len == 0) {
 240                         kprintf("gotcha!\n");
 241                 }
 242                 /* rq head */
 243                 NCP_RQ_HEAD(73,uiop->uio_td,cred);
 244                 ncp_rq_byte(rqp, 0);
 245                 ncp_rq_mem(rqp, (caddr_t)file, 6);
 246                 ncp_rq_dword(rqp, htonl(uiop->uio_offset));
 247                 ncp_rq_word_hl(rqp, len);
 248                 nwfs_uiotombuf(uiop,&rqp->mrq,len,&rqp->bpos);
 249                 checkbad(ncp_request(conn,rqp));
 250                 if (len == 0)
 251                         break;
 252                 NCP_RQ_EXIT;
 253                 if (error) {
 254                         backup = len;
 255                         uiop->uio_iov->iov_base -= backup;
 256                         uiop->uio_iov->iov_len += backup;
 257                         uiop->uio_offset -= backup;
 258                         uiop->uio_resid += backup;
 259                         break;
 260                 }
 261                 tsiz -= len;
 262         }
 263         if (error)
 264                 uiop->uio_resid = tsiz;
 265         switch (error) {
 266             case NWE_INSUFFICIENT_SPACE:
 267                 error = ENOSPC;
 268                 break;
 269         }
 270         return (error);
 271 }