usr/src/cmd/fs.d/autofs/mount.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  *      autofs mount.c
  27  *
  28  */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <stdio.h>
  33 #include <unistd.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36 #include <sys/param.h>
  37 #include <sys/stat.h>
  38 #include <sys/mntent.h>
  39 #include <sys/mnttab.h>
  40 #include <sys/mount.h>
  41 #include <sys/utsname.h>
  42 #include <sys/tiuser.h>
  43 #include <string.h>
  44 #include <fslib.h>
  45 #include <errno.h>
  46 #include <rpcsvc/daemon_utils.h>
  47 #include "automount.h"
  48
  49 #define MNTTAB_OPTS     "ignore,nest"
  50
  51 static void usage();
  52 static void process_opts(char *options, int *directp);
  53 static char *concat_opts(const char *opts1, const char *opts2);
  54 static int  ro_given(char *options);
  55
  56 /*
  57  * list of support services needed
  58  */
  59 static char     *service_list[] = { AUTOMOUNTD, NULL };
  60
  61 int
  62 main(int argc, char *argv[])
  63 {
  64         int error;
  65         int c;
  66         int mntflags = 0;
  67         int nmflg = 0;
  68         int roflg = 0;
  69         char *mntpnt, *mapname;
  70         struct utsname utsname;
  71         char autofs_addr[MAXADDRLEN];
  72         struct autofs_args fni;
  73         char *options = "";
  74         int mount_timeout = AUTOFS_MOUNT_TIMEOUT;
  75         char obuf[MAX_MNTOPT_STR];
  76
  77         while ((c = getopt(argc, argv, "o:mrq")) != EOF) {
  78                 switch (c) {
  79                 case '?':
  80                         usage();
  81                         exit(1);
  82                         /* NOTREACHED */
  83
  84                 case 'o':
  85                         options = optarg;
  86                         break;
  87
  88                 case 'm':
  89                         nmflg++;
  90                         break;
  91                 case 'r':       /* converted to -o ro always */
  92                         roflg++;
  93                         break;
  94                 /*
  95                  *  The "quiet" flag can be ignored, since this
  96                  *  program never complains about invalid -o options
  97                  *  anyway.
  98                  */
  99                 case 'q':
 100                         break;
 101
 102                 default:
 103                         usage();
 104                 }
 105         }
 106         if (argc - optind != 2)
 107                 usage();
 108
 109         mapname = argv[optind];
 110         mntpnt  = argv[optind + 1];
 111
 112         if (strcmp(mntpnt, "/-") == 0) {
 113                 (void) fprintf(stderr, "invalid mountpoint: /-\n");
 114                 exit(1);
 115         }
 116
 117         if (uname(&utsname) < 0) {
 118                 perror("uname");
 119                 exit(1);
 120         }
 121         (void) strcpy(autofs_addr, utsname.nodename);
 122         (void) strcat(autofs_addr, ".autofs");
 123
 124         process_opts(options, &fni.direct);
 125
 126         if (roflg && !ro_given(options))
 127                 options = concat_opts(options, "ro");
 128
 129         fni.addr.buf    = autofs_addr;
 130         fni.addr.len    = strlen(fni.addr.buf);
 131         fni.addr.maxlen = fni.addr.len;
 132         fni.path        = mntpnt;
 133         fni.opts        = options;
 134         fni.map         = mapname;
 135         fni.subdir      = "";
 136         if (fni.direct)
 137                 fni.key = mntpnt;
 138         else
 139                 fni.key = "";
 140         fni.mount_to    = mount_timeout;
 141         fni.rpc_to      = AUTOFS_RPC_TIMEOUT;
 142
 143         strcpy(obuf, options);
 144         if (*obuf != '\0')
 145                 strcat(obuf, ",");
 146         strcat(obuf,
 147                 fni.direct ? MNTTAB_OPTS ",direct" : MNTTAB_OPTS ",indirect");
 148
 149         /*
 150          * enable services as needed.
 151          */
 152         _check_services(service_list);
 153
 154         error = mount(fni.map, mntpnt, mntflags | MS_DATA | MS_OPTIONSTR,
 155                 MNTTYPE_AUTOFS, &fni, sizeof (fni), obuf, MAX_MNTOPT_STR);
 156         if (error < 0) {
 157                 perror("autofs mount");
 158                 exit(1);
 159         }
 160         return (0);
 161 }
 162
 163 static void
 164 usage()
 165 {
 166         (void) fprintf(stderr,
 167             "Usage: autofs mount [-r] [-o opts]  map  dir\n");
 168         exit(1);
 169 }
 170
 171 /*
 172  * Remove pseudo-options "direct", "indirect", "nest", and "ignore" from
 173  * option list.  Set *directp to 1 if "direct" is found, and 0 otherwise
 174  * (mounts are indirect by default).  If both "direct" and "indirect" are
 175  * found, the last one wins.
 176  */
 177 static void
 178 process_opts(char *options, int *directp)
 179 {
 180         char *opt;
 181         char *opts;
 182
 183         if ((opts = strdup(options)) == NULL) {
 184                 (void) fprintf(stderr,
 185                                 "autofs mount: memory allocation failed\n");
 186                 exit(1);
 187         }
 188         options[0] = '\0';
 189         *directp = 0;
 190
 191         while ((opt = strtok(opts, ",")) != NULL) {
 192                 opts = NULL;
 193                 while (isspace(*opt)) {
 194                         opt++;
 195                 }
 196                 if (strcmp(opt, "direct") == 0) {
 197                         *directp = 1;
 198                 } else if (strcmp(opt, "indirect") == 0) {
 199                         *directp = 0;
 200                 } else if ((strcmp(opt, "nest") != 0) &&
 201                                 (strcmp(opt, "ignore") != 0)) {
 202                         if (options[0] != '\0') {
 203                                 (void) strcat(options, ",");
 204                         }
 205                         (void) strcat(options, opt);
 206                 }
 207         };
 208 }
 209
 210 /*
 211  * Concatenate two options strings, with a comma between them.
 212  */
 213 static char *
 214 concat_opts(const char *opts1, const char *opts2)
 215 {
 216         char *opts = malloc(strlen(opts1) + strlen(opts2) + 2);
 217         if (opts == NULL) {
 218                 (void) fprintf(stderr,
 219                         "autofs mount: memory allocation failed\n");
 220                 exit(1);
 221         }
 222         strcpy(opts, opts1);
 223         if (opts1[0] != '\0' && opts2[0] != '\0') {
 224                 strcat(opts, ",");
 225         }
 226         return (strcat(opts, opts2));
 227 }
 228
 229 /*
 230  * check the options string for 'ro' options
 231  * if present returns 1 otherwise return 0;
 232  */
 233
 234 static int
 235 ro_given(char *options)
 236 {
 237         char    *op = options;
 238
 239         if (!*op)
 240                 return (0);
 241
 242         while (op != 0) {
 243                 if (*op == 'r' && *(op+1) == 'o' &&
 244                         (*(op+2) == ',' || *(op+2) == '\0'))
 245                         return (1);
 246
 247                 if ((op = strchr(op, ',')) != NULL)
 248                         op++;
 249         }
 250
 251
 252         return (0);
 253 }