1*5c51f124SMoriah Waterland /*
2*5c51f124SMoriah Waterland * CDDL HEADER START
3*5c51f124SMoriah Waterland *
4*5c51f124SMoriah Waterland * The contents of this file are subject to the terms of the
5*5c51f124SMoriah Waterland * Common Development and Distribution License (the "License").
6*5c51f124SMoriah Waterland * You may not use this file except in compliance with the License.
7*5c51f124SMoriah Waterland *
8*5c51f124SMoriah Waterland * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*5c51f124SMoriah Waterland * or http://www.opensolaris.org/os/licensing.
10*5c51f124SMoriah Waterland * See the License for the specific language governing permissions
11*5c51f124SMoriah Waterland * and limitations under the License.
12*5c51f124SMoriah Waterland *
13*5c51f124SMoriah Waterland * When distributing Covered Code, include this CDDL HEADER in each
14*5c51f124SMoriah Waterland * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*5c51f124SMoriah Waterland * If applicable, add the following below this CDDL HEADER, with the
16*5c51f124SMoriah Waterland * fields enclosed by brackets "[]" replaced with your own identifying
17*5c51f124SMoriah Waterland * information: Portions Copyright [yyyy] [name of copyright owner]
18*5c51f124SMoriah Waterland *
19*5c51f124SMoriah Waterland * CDDL HEADER END
20*5c51f124SMoriah Waterland */
21*5c51f124SMoriah Waterland
22*5c51f124SMoriah Waterland /*
23*5c51f124SMoriah Waterland * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24*5c51f124SMoriah Waterland * Use is subject to license terms.
25*5c51f124SMoriah Waterland */
26*5c51f124SMoriah Waterland
27*5c51f124SMoriah Waterland
28*5c51f124SMoriah Waterland #include <stdio.h>
29*5c51f124SMoriah Waterland #include <stdlib.h>
30*5c51f124SMoriah Waterland #include <string.h>
31*5c51f124SMoriah Waterland #include <unistd.h>
32*5c51f124SMoriah Waterland #include <libintl.h>
33*5c51f124SMoriah Waterland #include <errno.h>
34*5c51f124SMoriah Waterland #include <assert.h>
35*5c51f124SMoriah Waterland #include <sys/types.h>
36*5c51f124SMoriah Waterland #include <sys/mntent.h>
37*5c51f124SMoriah Waterland #include <sys/mnttab.h>
38*5c51f124SMoriah Waterland #include <sys/param.h>
39*5c51f124SMoriah Waterland #include <libzonecfg.h>
40*5c51f124SMoriah Waterland #include "zones_strings.h"
41*5c51f124SMoriah Waterland #include "instzones_lib.h"
42*5c51f124SMoriah Waterland
43*5c51f124SMoriah Waterland #define MNTTAB "/etc/mnttab"
44*5c51f124SMoriah Waterland
45*5c51f124SMoriah Waterland #define MNTTAB_HUNK 32
46*5c51f124SMoriah Waterland
47*5c51f124SMoriah Waterland static struct mnttab *mountTable;
48*5c51f124SMoriah Waterland static size_t mountTableSize = 0;
49*5c51f124SMoriah Waterland static boolean_t createdFlag = B_FALSE;
50*5c51f124SMoriah Waterland
51*5c51f124SMoriah Waterland /*
52*5c51f124SMoriah Waterland * Name : z_createMountTable
53*5c51f124SMoriah Waterland * Description : Populate the mountTable Array with mnttab entries
54*5c51f124SMoriah Waterland * Arguments : void
55*5c51f124SMoriah Waterland * Returns : int
56*5c51f124SMoriah Waterland * 0: The Mount Table was succesfully initialized
57*5c51f124SMoriah Waterland * -1: There was an error during initialisation
58*5c51f124SMoriah Waterland */
59*5c51f124SMoriah Waterland int
z_createMountTable(void)60*5c51f124SMoriah Waterland z_createMountTable(void)
61*5c51f124SMoriah Waterland {
62*5c51f124SMoriah Waterland FILE *fp;
63*5c51f124SMoriah Waterland struct mnttab ent;
64*5c51f124SMoriah Waterland struct mnttab *entp;
65*5c51f124SMoriah Waterland
66*5c51f124SMoriah Waterland if (createdFlag) {
67*5c51f124SMoriah Waterland return (0);
68*5c51f124SMoriah Waterland }
69*5c51f124SMoriah Waterland
70*5c51f124SMoriah Waterland fp = fopen(MNTTAB, "r");
71*5c51f124SMoriah Waterland if (fp == NULL) {
72*5c51f124SMoriah Waterland _z_program_error(ERR_OPEN_READ, MNTTAB, errno,
73*5c51f124SMoriah Waterland strerror(errno));
74*5c51f124SMoriah Waterland return (-1);
75*5c51f124SMoriah Waterland }
76*5c51f124SMoriah Waterland
77*5c51f124SMoriah Waterland /* Put the entries into the table */
78*5c51f124SMoriah Waterland mountTable = NULL;
79*5c51f124SMoriah Waterland mountTableSize = 0;
80*5c51f124SMoriah Waterland createdFlag = B_TRUE;
81*5c51f124SMoriah Waterland while (getmntent(fp, &ent) == 0) {
82*5c51f124SMoriah Waterland if (mountTableSize % MNTTAB_HUNK == 0) {
83*5c51f124SMoriah Waterland mountTable = _z_realloc(mountTable,
84*5c51f124SMoriah Waterland (mountTableSize + MNTTAB_HUNK) * sizeof (ent));
85*5c51f124SMoriah Waterland }
86*5c51f124SMoriah Waterland entp = &mountTable[mountTableSize++];
87*5c51f124SMoriah Waterland
88*5c51f124SMoriah Waterland /*
89*5c51f124SMoriah Waterland * Zero out any fields we're not using.
90*5c51f124SMoriah Waterland */
91*5c51f124SMoriah Waterland (void) memset(entp, 0, sizeof (*entp));
92*5c51f124SMoriah Waterland
93*5c51f124SMoriah Waterland if (ent.mnt_special != NULL)
94*5c51f124SMoriah Waterland entp->mnt_special = _z_strdup(ent.mnt_special);
95*5c51f124SMoriah Waterland if (ent.mnt_mntopts != NULL)
96*5c51f124SMoriah Waterland entp->mnt_mntopts = _z_strdup(ent.mnt_mntopts);
97*5c51f124SMoriah Waterland entp->mnt_mountp = _z_strdup(ent.mnt_mountp);
98*5c51f124SMoriah Waterland entp->mnt_fstype = _z_strdup(ent.mnt_fstype);
99*5c51f124SMoriah Waterland }
100*5c51f124SMoriah Waterland
101*5c51f124SMoriah Waterland (void) fclose(fp);
102*5c51f124SMoriah Waterland return (0);
103*5c51f124SMoriah Waterland }
104*5c51f124SMoriah Waterland
105*5c51f124SMoriah Waterland /*
106*5c51f124SMoriah Waterland * Name : findPathRWStatus
107*5c51f124SMoriah Waterland * Description : Check whether the given path is an mnttab entry
108*5c51f124SMoriah Waterland * Arguments : char * - The Path to be verified
109*5c51f124SMoriah Waterland * Returns : int
110*5c51f124SMoriah Waterland * -1: The Path is NOT present in the table (mnttab)
111*5c51f124SMoriah Waterland * 0: The Path is present in the table and is mounted read-only
112*5c51f124SMoriah Waterland * 1: The Path is present in the table and is mounted read-write
113*5c51f124SMoriah Waterland */
114*5c51f124SMoriah Waterland static int
findPathRWStatus(const char * a_path)115*5c51f124SMoriah Waterland findPathRWStatus(const char *a_path)
116*5c51f124SMoriah Waterland {
117*5c51f124SMoriah Waterland int i;
118*5c51f124SMoriah Waterland
119*5c51f124SMoriah Waterland for (i = 0; i < mountTableSize; i++) {
120*5c51f124SMoriah Waterland if (strcmp(a_path, mountTable[i].mnt_mountp) == 0) {
121*5c51f124SMoriah Waterland if (hasmntopt(&mountTable[i], MNTOPT_RO) != NULL) {
122*5c51f124SMoriah Waterland return (0);
123*5c51f124SMoriah Waterland } else {
124*5c51f124SMoriah Waterland return (1);
125*5c51f124SMoriah Waterland }
126*5c51f124SMoriah Waterland }
127*5c51f124SMoriah Waterland }
128*5c51f124SMoriah Waterland
129*5c51f124SMoriah Waterland return (-1);
130*5c51f124SMoriah Waterland }
131*5c51f124SMoriah Waterland
132*5c51f124SMoriah Waterland
133*5c51f124SMoriah Waterland /*
134*5c51f124SMoriah Waterland * Name : z_isPathWritable
135*5c51f124SMoriah Waterland * Description : Check if the given path is in a writable area
136*5c51f124SMoriah Waterland * Arguments : char * - The Path to be verified
137*5c51f124SMoriah Waterland * Returns : int
138*5c51f124SMoriah Waterland * 0: The Path is under a read-only mount
139*5c51f124SMoriah Waterland * 1: The Path is under a read-write mount
140*5c51f124SMoriah Waterland * NOTE : This funcion automatically initialises
141*5c51f124SMoriah Waterland * the mountPoint table if needed.
142*5c51f124SMoriah Waterland */
143*5c51f124SMoriah Waterland int
z_isPathWritable(const char * a_str)144*5c51f124SMoriah Waterland z_isPathWritable(const char *a_str)
145*5c51f124SMoriah Waterland {
146*5c51f124SMoriah Waterland int i, result, slen;
147*5c51f124SMoriah Waterland char a_path[MAXPATHLEN];
148*5c51f124SMoriah Waterland
149*5c51f124SMoriah Waterland if (!createdFlag) {
150*5c51f124SMoriah Waterland if (z_createMountTable() != 0) {
151*5c51f124SMoriah Waterland return (1);
152*5c51f124SMoriah Waterland }
153*5c51f124SMoriah Waterland }
154*5c51f124SMoriah Waterland
155*5c51f124SMoriah Waterland (void) strlcpy(a_path, a_str, sizeof (a_path));
156*5c51f124SMoriah Waterland slen = strlen(a_path);
157*5c51f124SMoriah Waterland
158*5c51f124SMoriah Waterland /*
159*5c51f124SMoriah Waterland * This for loop traverses Path backwards, incrementally removing the
160*5c51f124SMoriah Waterland * basename of Path and looking for the resultant directory in the
161*5c51f124SMoriah Waterland * mnttab. Once found, it returns the rw status of that file system.
162*5c51f124SMoriah Waterland */
163*5c51f124SMoriah Waterland for (i = slen; i > 0; i--) {
164*5c51f124SMoriah Waterland if ((a_path[i] == '/') || (a_path[i] == '\0')) {
165*5c51f124SMoriah Waterland a_path[i] = '\0';
166*5c51f124SMoriah Waterland result = findPathRWStatus(a_path);
167*5c51f124SMoriah Waterland if (result != -1) {
168*5c51f124SMoriah Waterland return (result);
169*5c51f124SMoriah Waterland }
170*5c51f124SMoriah Waterland }
171*5c51f124SMoriah Waterland }
172*5c51f124SMoriah Waterland
173*5c51f124SMoriah Waterland return (1);
174*5c51f124SMoriah Waterland }
175*5c51f124SMoriah Waterland
176*5c51f124SMoriah Waterland /*
177*5c51f124SMoriah Waterland * Name : z_destroyMountTable
178*5c51f124SMoriah Waterland * Description : Clear the entries in the mount table
179*5c51f124SMoriah Waterland * Arguments : void
180*5c51f124SMoriah Waterland * Returns : void
181*5c51f124SMoriah Waterland */
182*5c51f124SMoriah Waterland void
z_destroyMountTable(void)183*5c51f124SMoriah Waterland z_destroyMountTable(void)
184*5c51f124SMoriah Waterland {
185*5c51f124SMoriah Waterland int i;
186*5c51f124SMoriah Waterland
187*5c51f124SMoriah Waterland if (!createdFlag) {
188*5c51f124SMoriah Waterland return;
189*5c51f124SMoriah Waterland }
190*5c51f124SMoriah Waterland
191*5c51f124SMoriah Waterland if (mountTable == NULL) {
192*5c51f124SMoriah Waterland return;
193*5c51f124SMoriah Waterland }
194*5c51f124SMoriah Waterland
195*5c51f124SMoriah Waterland for (i = 0; i < mountTableSize; i++) {
196*5c51f124SMoriah Waterland free(mountTable[i].mnt_mountp);
197*5c51f124SMoriah Waterland free(mountTable[i].mnt_fstype);
198*5c51f124SMoriah Waterland free(mountTable[i].mnt_special);
199*5c51f124SMoriah Waterland free(mountTable[i].mnt_mntopts);
200*5c51f124SMoriah Waterland assert(mountTable[i].mnt_time == NULL);
201*5c51f124SMoriah Waterland }
202*5c51f124SMoriah Waterland
203*5c51f124SMoriah Waterland free(mountTable);
204*5c51f124SMoriah Waterland mountTable = NULL;
205*5c51f124SMoriah Waterland mountTableSize = 0;
206*5c51f124SMoriah Waterland createdFlag = B_FALSE;
207*5c51f124SMoriah Waterland }
208*5c51f124SMoriah Waterland
209*5c51f124SMoriah Waterland /*
210*5c51f124SMoriah Waterland * Name : z_resolve_lofs
211*5c51f124SMoriah Waterland * Description : Loop over potential loopback mounts and symlinks in a
212*5c51f124SMoriah Waterland * given path and resolve them all down to an absolute path.
213*5c51f124SMoriah Waterland * Arguments : char * - path to resolve. path is in writable storage.
214*5c51f124SMoriah Waterland * size_t - length of path storage.
215*5c51f124SMoriah Waterland * Returns : void
216*5c51f124SMoriah Waterland */
217*5c51f124SMoriah Waterland void
z_resolve_lofs(char * path,size_t pathlen)218*5c51f124SMoriah Waterland z_resolve_lofs(char *path, size_t pathlen)
219*5c51f124SMoriah Waterland {
220*5c51f124SMoriah Waterland int len, arlen, i;
221*5c51f124SMoriah Waterland const char *altroot;
222*5c51f124SMoriah Waterland char tmppath[MAXPATHLEN];
223*5c51f124SMoriah Waterland boolean_t outside_altroot;
224*5c51f124SMoriah Waterland
225*5c51f124SMoriah Waterland if ((len = resolvepath(path, tmppath, sizeof (tmppath))) == -1)
226*5c51f124SMoriah Waterland return;
227*5c51f124SMoriah Waterland
228*5c51f124SMoriah Waterland tmppath[len] = '\0';
229*5c51f124SMoriah Waterland (void) strlcpy(path, tmppath, pathlen);
230*5c51f124SMoriah Waterland
231*5c51f124SMoriah Waterland if (z_createMountTable() == -1)
232*5c51f124SMoriah Waterland return;
233*5c51f124SMoriah Waterland
234*5c51f124SMoriah Waterland altroot = zonecfg_get_root();
235*5c51f124SMoriah Waterland arlen = strlen(altroot);
236*5c51f124SMoriah Waterland outside_altroot = B_FALSE;
237*5c51f124SMoriah Waterland for (;;) {
238*5c51f124SMoriah Waterland struct mnttab *mnp;
239*5c51f124SMoriah Waterland
240*5c51f124SMoriah Waterland /* Search in reverse order to find longest match */
241*5c51f124SMoriah Waterland for (i = mountTableSize; i > 0; i--) {
242*5c51f124SMoriah Waterland mnp = &mountTable[i - 1];
243*5c51f124SMoriah Waterland if (mnp->mnt_fstype == NULL ||
244*5c51f124SMoriah Waterland mnp->mnt_mountp == NULL ||
245*5c51f124SMoriah Waterland mnp->mnt_special == NULL)
246*5c51f124SMoriah Waterland continue;
247*5c51f124SMoriah Waterland len = strlen(mnp->mnt_mountp);
248*5c51f124SMoriah Waterland if (strncmp(mnp->mnt_mountp, path, len) == 0 &&
249*5c51f124SMoriah Waterland (path[len] == '/' || path[len] == '\0'))
250*5c51f124SMoriah Waterland break;
251*5c51f124SMoriah Waterland }
252*5c51f124SMoriah Waterland if (i <= 0)
253*5c51f124SMoriah Waterland break;
254*5c51f124SMoriah Waterland
255*5c51f124SMoriah Waterland /* If it's not a lofs then we're done */
256*5c51f124SMoriah Waterland if (strcmp(mnp->mnt_fstype, MNTTYPE_LOFS) != 0)
257*5c51f124SMoriah Waterland break;
258*5c51f124SMoriah Waterland
259*5c51f124SMoriah Waterland if (outside_altroot) {
260*5c51f124SMoriah Waterland char *cp;
261*5c51f124SMoriah Waterland int olen = sizeof (MNTOPT_RO) - 1;
262*5c51f124SMoriah Waterland
263*5c51f124SMoriah Waterland /*
264*5c51f124SMoriah Waterland * If we run into a read-only mount outside of the
265*5c51f124SMoriah Waterland * alternate root environment, then the user doesn't
266*5c51f124SMoriah Waterland * want this path to be made read-write.
267*5c51f124SMoriah Waterland */
268*5c51f124SMoriah Waterland if (mnp->mnt_mntopts != NULL &&
269*5c51f124SMoriah Waterland (cp = strstr(mnp->mnt_mntopts, MNTOPT_RO)) !=
270*5c51f124SMoriah Waterland NULL &&
271*5c51f124SMoriah Waterland (cp == mnp->mnt_mntopts || cp[-1] == ',') &&
272*5c51f124SMoriah Waterland (cp[olen] == '\0' || cp[olen] == ',')) {
273*5c51f124SMoriah Waterland break;
274*5c51f124SMoriah Waterland }
275*5c51f124SMoriah Waterland } else if (arlen > 0 &&
276*5c51f124SMoriah Waterland (strncmp(mnp->mnt_special, altroot, arlen) != 0 ||
277*5c51f124SMoriah Waterland (mnp->mnt_special[arlen] != '\0' &&
278*5c51f124SMoriah Waterland mnp->mnt_special[arlen] != '/'))) {
279*5c51f124SMoriah Waterland outside_altroot = B_TRUE;
280*5c51f124SMoriah Waterland }
281*5c51f124SMoriah Waterland /* use temporary buffer because new path might be longer */
282*5c51f124SMoriah Waterland (void) snprintf(tmppath, sizeof (tmppath), "%s%s",
283*5c51f124SMoriah Waterland mnp->mnt_special, path + len);
284*5c51f124SMoriah Waterland if ((len = resolvepath(tmppath, path, pathlen)) == -1)
285*5c51f124SMoriah Waterland break;
286*5c51f124SMoriah Waterland path[len] = '\0';
287*5c51f124SMoriah Waterland }
288*5c51f124SMoriah Waterland }
289