1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* kernel_interface.c.
Copyright (C) 2006, 2007, 2008, 2009, 2014, 2020 Werner Baumann
Copyright (C) 2022 Ali Abdallah <[email protected]>
This file is part of davfs2.
davfs2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
davfs2 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with davfs2; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "config.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIBINTL_H
#include <libintl.h>
#endif
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <sys/wait.h>
#include "util.h"
#include "defaults.h"
#include "mount_davfs.h"
#include "cache.h"
#include "fuse_kernel.h"
#include "kernel_interface.h"
#ifdef ENABLE_NLS
#define _(String) gettext(String)
#else
#define _(String) String
#endif
/* Private constants */
/*===================*/
/* Name of the device to communicate with the kernel file system. */
#define FUSE_DEV_NAME "fuse"
#ifdef __FreeBSD__
enum { DAV_IOV_FSTYPE, DAV_IOV_ALLOW_OTHER, DAV_IOV_FSPATH, DAV_IOV_FSNAME,
DAV_IOV_FD, DAV_IOV_MAX_READ, DAV_IOV_ERR, DAV_IOV_MAX};
/* max pairs of iovec mount options */
#define DAV_MAX_IOVEC_LEN (DAV_IOV_MAX + 1) * 2
/* Code taken from FreeBSD sbin/mount */
static void
add_iovec_opt(struct iovec **iov, int *iovlen, const char *name, void *val,
size_t len)
{
int i;
if (*iovlen < 0)
return;
i = *iovlen;
if (i + 2 > (DAV_MAX_IOVEC_LEN))
{
ERR("DAV_MAX_IOVEC_LEN reached\n");
}
(*iov)[i].iov_base = strdup(name);
(*iov)[i].iov_len = strlen(name) + 1;
i++;
(*iov)[i].iov_base = val;
if (len == (size_t)-1) {
if (val != NULL)
len = strlen(val) + 1;
else
len = 0;
}
(*iov)[i].iov_len = (int)len;
*iovlen = ++i;
}
static void free_iovec (struct iovec *iov, int iovlen)
{
int i = 0;
for (i = 0; i <= iovlen; i+=2)
{
if (iov[i].iov_base)
free(iov[i].iov_base);
}
free(iov);
}
#endif
/* Public functions */
/*==================*/
void
dav_init_kernel_interface(int *dev, size_t *buf_size, const char *url,
const char *mpoint, const dav_args *args)
{
#ifdef __FreeBSD__
struct iovec *iov;
int iovlen;
char errmsg[255];
char fdstr[15];
char bufstr[15];
iovlen = 0;
iov = NULL;
memset(errmsg, 0, sizeof(errmsg));
#endif
uid_t orig = geteuid();
if (seteuid(0) != 0)
ERR(_("can't change effective user id"));
char *path;
if (asprintf(&path, "%s/%s", DAV_DEV_DIR, FUSE_DEV_NAME) < 0)
abort();
*dev = open(path, O_RDWR | O_NONBLOCK);
if (*dev <= 0) {
ERR(_("loading kernel module fuse"));
int ret;
pid_t pid = fork();
if (pid == 0) {
#if defined(__FreeBSD__)
execl("/sbin/kldload", "kldload", "fusefs", NULL);
#elif defined(__linux__)
execl("/sbin/modprobe", "modprobe", "fuse", NULL);
#endif
_exit(EXIT_FAILURE);
} else if (pid < 0) {
exit(EXIT_FAILURE);
} else {
if (waitpid(pid, &ret, 0) != pid)
exit(EXIT_FAILURE);
}
if (ret) {
WARN(_("loading kernel module fuse failed"));
} else {
*dev = open(path, O_RDWR | O_NONBLOCK);
}
if (*dev <= 0) {
WARN(_("waiting for /dev/fuse to be created"));
sleep(2);
*dev = open(path, O_RDWR | O_NONBLOCK);
}
}
free(path);
if (*dev <= 0) {
ERR(_("can't open fuse device"));
}
if (*buf_size < (FUSE_MIN_READ_BUFFER + 4096)) {
*buf_size = FUSE_MIN_READ_BUFFER + 4096;
}
#if defined(__FreeBSD__)
sprintf(fdstr, "%d", *dev);
sprintf(bufstr, "%lu", (unsigned long int) (*buf_size - 4096));
int allow_other = 1;
iov = malloc (sizeof (struct iovec) * (DAV_MAX_IOVEC_LEN));
add_iovec_opt(&iov, &iovlen, "fstype", __DECONST(void *, "fusefs"), (size_t)-1);
add_iovec_opt(&iov, &iovlen, "allow_other", __DECONST(void *, &allow_other), (size_t)-1);
add_iovec_opt(&iov, &iovlen, "fspath", __DECONST(void *, mpoint), (size_t)-1);
add_iovec_opt(&iov, &iovlen, "from", __DECONST(void *, "/dev/fuse"), (size_t)-1);
add_iovec_opt(&iov, &iovlen, "fsname=", __DECONST(void *, url), strlen(url)+1);
add_iovec_opt(&iov, &iovlen, "fd", fdstr, (size_t)-1);
add_iovec_opt(&iov, &iovlen, "max_read=", bufstr, (ssize_t)-1);
add_iovec_opt(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
if (nmount(iov, iovlen, args->mopts) == -1) {
if (*errmsg != '\0')
err(EXIT_FAILURE, _("mounting failed %s : %s"), url, errmsg);
else
err(EXIT_FAILURE, _("mounting failed %s"), url);
}
free_iovec(iov, iovlen);
#elif defined(__linux__)
char *mdata;
if (asprintf(&mdata, "fd=%i,rootmode=%o,user_id=%i,group_id=%i,"
"allow_other,max_read=%lu", *dev, args->dir_mode, args->uid,
args->gid, (unsigned long int) (*buf_size - 4096)) < 0)
abort();
if (mount(url, mpoint, "fuse", args->mopts, mdata) != 0) {
ERR(_("mounting failed"));
}
free(mdata);
#endif
if (seteuid(orig) != 0)
ERR(_("can't change effective user id"));
}
|
