usr.sbin/rpc.ypxfrd/ypxfrd_server.c

   1 /*
   2  * Copyright (c) 1995, 1996
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  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 Bill Paul.
  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 Bill Paul 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 Bill Paul 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/usr.sbin/rpc.ypxfrd/ypxfrd_server.c,v 1.8.2.1 2002/02/15 00:46:58 des Exp $
  33  * $DragonFly: src/usr.sbin/rpc.ypxfrd/ypxfrd_server.c,v 1.3 2004/05/20 21:24:43 cpressey Exp $
  34  */
  35
  36 #include "ypxfrd.h"
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <string.h>
  42 #include <errno.h>
  43 #include <sys/types.h>
  44 #include <sys/param.h>
  45 #include <sys/uio.h>
  46 #include <sys/fcntl.h>
  47 #include <machine/endian.h>
  48 #include "ypxfrd_extern.h"
  49
  50 int forked = 0;
  51 int children = 0;
  52 int fp = 0;
  53
  54 static bool_t
  55 xdr_my_xfr(XDR *xdrs, xfr *objp)
  56 {
  57         unsigned char buf[XFRBLOCKSIZE];
  58
  59         while (1) {
  60                 if ((objp->xfr_u.xfrblock_buf.xfrblock_buf_len =
  61                     read(fp, &buf, XFRBLOCKSIZE)) != -1) {
  62                         objp->ok = TRUE;
  63                         objp->xfr_u.xfrblock_buf.xfrblock_buf_val = (char *)&buf;
  64                 } else {
  65                         objp->ok = FALSE;
  66                         objp->xfr_u.xfrstat = XFR_READ_ERR;
  67                         yp_error("read error: %s", strerror(errno));
  68                 }
  69
  70                 /* Serialize */
  71                 if (!xdr_xfr(xdrs, objp))
  72                         return(FALSE);
  73                 if (objp->ok == FALSE)
  74                         return(TRUE);
  75                 if (objp->xfr_u.xfrblock_buf.xfrblock_buf_len < XFRBLOCKSIZE) {
  76                         objp->ok = FALSE;
  77                         objp->xfr_u.xfrstat = XFR_DONE;
  78                         if (!xdr_xfr(xdrs, objp))
  79                                 return(FALSE);
  80                         return(TRUE);
  81                 }
  82         }
  83 }
  84
  85 struct xfr *
  86 ypxfrd_getmap_1_svc(ypxfr_mapname *argp, struct svc_req *rqstp)
  87 {
  88         static struct xfr  result;
  89         char buf[MAXPATHLEN];
  90
  91         result.ok = FALSE;
  92         result.xfr_u.xfrstat = XFR_DENIED;
  93
  94         if (yp_validdomain(argp->xfrdomain)) {
  95                 return(&result);
  96         }
  97
  98         if (yp_access(argp->xfrmap, (struct svc_req *)rqstp)) {
  99                 return(&result);
 100         }
 101
 102         snprintf (buf, sizeof(buf), "%s/%s/%s", yp_dir, argp->xfrdomain,
 103                                                         argp->xfrmap);
 104         if (access((char *)&buf, R_OK) == -1) {
 105                 result.xfr_u.xfrstat = XFR_ACCESS;
 106                 return(&result);
 107         }
 108
 109         if (argp->xfr_db_type != XFR_DB_BSD_HASH &&
 110             argp->xfr_db_type != XFR_DB_ANY) {
 111                 result.xfr_u.xfrstat = XFR_DB_TYPE_MISMATCH;
 112                 return(&result);
 113         }
 114
 115 #if BYTE_ORDER == LITTLE_ENDIAN
 116         if (argp->xfr_byte_order == XFR_ENDIAN_BIG) {
 117 #else
 118         if (argp->xfr_byte_order == XFR_ENDIAN_LITTLE) {
 119 #endif
 120                 result.xfr_u.xfrstat = XFR_DB_ENDIAN_MISMATCH;
 121                 return(&result);
 122         }
 123
 124 #ifndef DEBUG
 125         if (children < MAX_CHILDREN && fork()) {
 126                 children++;
 127                 forked = 0;
 128                 return (NULL);
 129         } else {
 130                 forked++;
 131         }
 132 #endif
 133         if ((fp = open((char *)&buf, O_RDONLY)) == -1) {
 134                 result.xfr_u.xfrstat = XFR_READ_ERR;
 135                 return(&result);
 136         }
 137
 138         /* Start sending the file. */
 139
 140         svc_sendreply(rqstp->rq_xprt, xdr_my_xfr, (char *)&result);
 141
 142         close(fp);
 143
 144         return (NULL);
 145 }