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9f107513 AL |
1 | /* |
2 | * Virtio 9p Posix callback | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | #include "virtio.h" | |
14 | #include "virtio-9p.h" | |
c494dd6f | 15 | #include <arpa/inet.h> |
131dcb25 AL |
16 | #include <pwd.h> |
17 | #include <grp.h> | |
c494dd6f AL |
18 | #include <sys/socket.h> |
19 | #include <sys/un.h> | |
131dcb25 AL |
20 | |
21 | static const char *rpath(FsContext *ctx, const char *path) | |
22 | { | |
23 | /* FIXME: so wrong... */ | |
24 | static char buffer[4096]; | |
25 | snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path); | |
26 | return buffer; | |
27 | } | |
28 | ||
29 | static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf) | |
30 | { | |
31 | return lstat(rpath(ctx, path), stbuf); | |
32 | } | |
33 | ||
34 | static int local_setuid(FsContext *ctx, uid_t uid) | |
35 | { | |
36 | struct passwd *pw; | |
37 | gid_t groups[33]; | |
38 | int ngroups; | |
39 | static uid_t cur_uid = -1; | |
40 | ||
41 | if (cur_uid == uid) { | |
42 | return 0; | |
43 | } | |
44 | ||
45 | if (setreuid(0, 0)) { | |
46 | return -1; | |
47 | } | |
48 | ||
49 | pw = getpwuid(uid); | |
50 | if (pw == NULL) { | |
51 | return -1; | |
52 | } | |
53 | ||
54 | ngroups = 33; | |
55 | if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1) { | |
56 | return -1; | |
57 | } | |
58 | ||
59 | if (setgroups(ngroups, groups)) { | |
60 | return -1; | |
61 | } | |
62 | ||
63 | if (setregid(-1, pw->pw_gid)) { | |
64 | return -1; | |
65 | } | |
66 | ||
67 | if (setreuid(-1, uid)) { | |
68 | return -1; | |
69 | } | |
70 | ||
71 | cur_uid = uid; | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static ssize_t local_readlink(FsContext *ctx, const char *path, | |
77 | char *buf, size_t bufsz) | |
78 | { | |
79 | return readlink(rpath(ctx, path), buf, bufsz); | |
80 | } | |
81 | ||
82 | static int local_close(FsContext *ctx, int fd) | |
83 | { | |
84 | return close(fd); | |
85 | } | |
86 | ||
87 | static int local_closedir(FsContext *ctx, DIR *dir) | |
88 | { | |
89 | return closedir(dir); | |
90 | } | |
9f107513 | 91 | |
a6568fe2 AL |
92 | static int local_open(FsContext *ctx, const char *path, int flags) |
93 | { | |
94 | return open(rpath(ctx, path), flags); | |
95 | } | |
96 | ||
97 | static DIR *local_opendir(FsContext *ctx, const char *path) | |
98 | { | |
99 | return opendir(rpath(ctx, path)); | |
100 | } | |
101 | ||
a9231555 AL |
102 | static void local_rewinddir(FsContext *ctx, DIR *dir) |
103 | { | |
104 | return rewinddir(dir); | |
105 | } | |
106 | ||
107 | static off_t local_telldir(FsContext *ctx, DIR *dir) | |
108 | { | |
109 | return telldir(dir); | |
110 | } | |
111 | ||
112 | static struct dirent *local_readdir(FsContext *ctx, DIR *dir) | |
113 | { | |
114 | return readdir(dir); | |
115 | } | |
116 | ||
117 | static void local_seekdir(FsContext *ctx, DIR *dir, off_t off) | |
118 | { | |
119 | return seekdir(dir, off); | |
120 | } | |
121 | ||
122 | static ssize_t local_readv(FsContext *ctx, int fd, const struct iovec *iov, | |
123 | int iovcnt) | |
124 | { | |
125 | return readv(fd, iov, iovcnt); | |
126 | } | |
127 | ||
128 | static off_t local_lseek(FsContext *ctx, int fd, off_t offset, int whence) | |
129 | { | |
130 | return lseek(fd, offset, whence); | |
131 | } | |
132 | ||
8449360c AL |
133 | static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov, |
134 | int iovcnt) | |
135 | { | |
136 | return writev(fd, iov, iovcnt); | |
137 | } | |
138 | ||
c494dd6f AL |
139 | static int local_chmod(FsContext *ctx, const char *path, mode_t mode) |
140 | { | |
141 | return chmod(rpath(ctx, path), mode); | |
142 | } | |
143 | ||
144 | static int local_mknod(FsContext *ctx, const char *path, mode_t mode, dev_t dev) | |
145 | { | |
146 | return mknod(rpath(ctx, path), mode, dev); | |
147 | } | |
148 | ||
149 | static int local_mksock(FsContext *ctx2, const char *path) | |
150 | { | |
151 | struct sockaddr_un addr; | |
152 | int s; | |
153 | ||
154 | addr.sun_family = AF_UNIX; | |
155 | snprintf(addr.sun_path, 108, "%s", rpath(ctx2, path)); | |
156 | ||
157 | s = socket(PF_UNIX, SOCK_STREAM, 0); | |
158 | if (s == -1) { | |
159 | return -1; | |
160 | } | |
161 | ||
162 | if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) { | |
163 | close(s); | |
164 | return -1; | |
165 | } | |
166 | ||
167 | close(s); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static int local_mkdir(FsContext *ctx, const char *path, mode_t mode) | |
172 | { | |
173 | return mkdir(rpath(ctx, path), mode); | |
174 | } | |
175 | ||
176 | static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf) | |
177 | { | |
178 | return fstat(fd, stbuf); | |
179 | } | |
180 | ||
181 | static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode) | |
182 | { | |
183 | return open(rpath(ctx, path), flags, mode); | |
184 | } | |
185 | ||
186 | static int local_symlink(FsContext *ctx, const char *oldpath, | |
187 | const char *newpath) | |
188 | { | |
189 | return symlink(oldpath, rpath(ctx, newpath)); | |
190 | } | |
191 | ||
192 | static int local_link(FsContext *ctx, const char *oldpath, const char *newpath) | |
193 | { | |
194 | char *tmp = qemu_strdup(rpath(ctx, oldpath)); | |
195 | int err, serrno = 0; | |
196 | ||
197 | if (tmp == NULL) { | |
198 | return -ENOMEM; | |
199 | } | |
200 | ||
201 | err = link(tmp, rpath(ctx, newpath)); | |
202 | if (err == -1) { | |
203 | serrno = errno; | |
204 | } | |
205 | ||
206 | qemu_free(tmp); | |
207 | ||
208 | if (err == -1) { | |
209 | errno = serrno; | |
210 | } | |
211 | ||
212 | return err; | |
213 | } | |
214 | ||
8cf89e00 AL |
215 | static int local_truncate(FsContext *ctx, const char *path, off_t size) |
216 | { | |
217 | return truncate(rpath(ctx, path), size); | |
218 | } | |
219 | ||
220 | static int local_rename(FsContext *ctx, const char *oldpath, | |
221 | const char *newpath) | |
222 | { | |
223 | char *tmp; | |
224 | int err; | |
225 | ||
226 | tmp = qemu_strdup(rpath(ctx, oldpath)); | |
227 | if (tmp == NULL) { | |
228 | return -1; | |
229 | } | |
230 | ||
231 | err = rename(tmp, rpath(ctx, newpath)); | |
232 | if (err == -1) { | |
233 | int serrno = errno; | |
234 | qemu_free(tmp); | |
235 | errno = serrno; | |
236 | } else { | |
237 | qemu_free(tmp); | |
238 | } | |
239 | ||
240 | return err; | |
241 | ||
242 | } | |
243 | ||
244 | static int local_chown(FsContext *ctx, const char *path, uid_t uid, gid_t gid) | |
245 | { | |
246 | return chown(rpath(ctx, path), uid, gid); | |
247 | } | |
248 | ||
249 | static int local_utime(FsContext *ctx, const char *path, | |
250 | const struct utimbuf *buf) | |
251 | { | |
252 | return utime(rpath(ctx, path), buf); | |
253 | } | |
254 | ||
5bae1900 AL |
255 | static int local_remove(FsContext *ctx, const char *path) |
256 | { | |
257 | return remove(rpath(ctx, path)); | |
258 | } | |
259 | ||
8cf89e00 AL |
260 | static int local_fsync(FsContext *ctx, int fd) |
261 | { | |
262 | return fsync(fd); | |
263 | } | |
264 | ||
9f107513 | 265 | FileOperations local_ops = { |
131dcb25 AL |
266 | .lstat = local_lstat, |
267 | .setuid = local_setuid, | |
268 | .readlink = local_readlink, | |
269 | .close = local_close, | |
270 | .closedir = local_closedir, | |
a6568fe2 AL |
271 | .open = local_open, |
272 | .opendir = local_opendir, | |
a9231555 AL |
273 | .rewinddir = local_rewinddir, |
274 | .telldir = local_telldir, | |
275 | .readdir = local_readdir, | |
276 | .seekdir = local_seekdir, | |
277 | .readv = local_readv, | |
278 | .lseek = local_lseek, | |
8449360c | 279 | .writev = local_writev, |
c494dd6f AL |
280 | .chmod = local_chmod, |
281 | .mknod = local_mknod, | |
282 | .mksock = local_mksock, | |
283 | .mkdir = local_mkdir, | |
284 | .fstat = local_fstat, | |
285 | .open2 = local_open2, | |
286 | .symlink = local_symlink, | |
287 | .link = local_link, | |
8cf89e00 AL |
288 | .truncate = local_truncate, |
289 | .rename = local_rename, | |
290 | .chown = local_chown, | |
291 | .utime = local_utime, | |
5bae1900 | 292 | .remove = local_remove, |
8cf89e00 | 293 | .fsync = local_fsync, |
9f107513 | 294 | }; |