M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Helper for QEMU Proxy FS Driver |
| 3 | * Copyright IBM, Corp. 2011 |
| 4 | * |
| 5 | * Authors: |
| 6 | * M. Mohan Kumar <mohan@in.ibm.com> |
| 7 | * |
| 8 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 9 | * the COPYING file in the top-level directory. |
| 10 | */ |
Stefan Weil | e7e4a6c | 2012-01-11 19:34:30 +0100 | [diff] [blame] | 11 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 12 | #include <sys/resource.h> |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 13 | #include <getopt.h> |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 14 | #include <syslog.h> |
| 15 | #include <sys/capability.h> |
| 16 | #include <sys/fsuid.h> |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 17 | #include <sys/vfs.h> |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 18 | #include <sys/ioctl.h> |
| 19 | #include <linux/fs.h> |
| 20 | #ifdef CONFIG_LINUX_MAGIC_H |
| 21 | #include <linux/magic.h> |
| 22 | #endif |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 23 | #include "qemu-common.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 24 | #include "qemu/sockets.h" |
| 25 | #include "qemu/xattr.h" |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 26 | #include "virtio-9p-marshal.h" |
| 27 | #include "hw/9pfs/virtio-9p-proxy.h" |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 28 | #include "fsdev/virtio-9p-marshal.h" |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 29 | |
| 30 | #define PROGNAME "virtfs-proxy-helper" |
| 31 | |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 32 | #ifndef XFS_SUPER_MAGIC |
| 33 | #define XFS_SUPER_MAGIC 0x58465342 |
| 34 | #endif |
| 35 | #ifndef EXT2_SUPER_MAGIC |
| 36 | #define EXT2_SUPER_MAGIC 0xEF53 |
| 37 | #endif |
| 38 | #ifndef REISERFS_SUPER_MAGIC |
| 39 | #define REISERFS_SUPER_MAGIC 0x52654973 |
| 40 | #endif |
| 41 | #ifndef BTRFS_SUPER_MAGIC |
| 42 | #define BTRFS_SUPER_MAGIC 0x9123683E |
| 43 | #endif |
| 44 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 45 | static struct option helper_opts[] = { |
| 46 | {"fd", required_argument, NULL, 'f'}, |
| 47 | {"path", required_argument, NULL, 'p'}, |
| 48 | {"nodaemon", no_argument, NULL, 'n'}, |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 49 | {"socket", required_argument, NULL, 's'}, |
| 50 | {"uid", required_argument, NULL, 'u'}, |
| 51 | {"gid", required_argument, NULL, 'g'}, |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 52 | }; |
| 53 | |
| 54 | static bool is_daemon; |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 55 | static bool get_version; /* IOC getversion IOCTL supported */ |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 56 | |
Stefan Weil | c5c7d3f | 2012-01-11 19:47:37 +0100 | [diff] [blame] | 57 | static void GCC_FMT_ATTR(2, 3) do_log(int loglevel, const char *format, ...) |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 58 | { |
| 59 | va_list ap; |
| 60 | |
| 61 | va_start(ap, format); |
| 62 | if (is_daemon) { |
| 63 | vsyslog(LOG_CRIT, format, ap); |
| 64 | } else { |
| 65 | vfprintf(stderr, format, ap); |
| 66 | } |
| 67 | va_end(ap); |
| 68 | } |
| 69 | |
| 70 | static void do_perror(const char *string) |
| 71 | { |
| 72 | if (is_daemon) { |
| 73 | syslog(LOG_CRIT, "%s:%s", string, strerror(errno)); |
| 74 | } else { |
| 75 | fprintf(stderr, "%s:%s\n", string, strerror(errno)); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | static int do_cap_set(cap_value_t *cap_value, int size, int reset) |
| 80 | { |
| 81 | cap_t caps; |
| 82 | if (reset) { |
| 83 | /* |
| 84 | * Start with an empty set and set permitted and effective |
| 85 | */ |
| 86 | caps = cap_init(); |
| 87 | if (caps == NULL) { |
| 88 | do_perror("cap_init"); |
| 89 | return -1; |
| 90 | } |
| 91 | if (cap_set_flag(caps, CAP_PERMITTED, size, cap_value, CAP_SET) < 0) { |
| 92 | do_perror("cap_set_flag"); |
| 93 | goto error; |
| 94 | } |
| 95 | } else { |
| 96 | caps = cap_get_proc(); |
| 97 | if (!caps) { |
| 98 | do_perror("cap_get_proc"); |
| 99 | return -1; |
| 100 | } |
| 101 | } |
| 102 | if (cap_set_flag(caps, CAP_EFFECTIVE, size, cap_value, CAP_SET) < 0) { |
| 103 | do_perror("cap_set_flag"); |
| 104 | goto error; |
| 105 | } |
| 106 | if (cap_set_proc(caps) < 0) { |
| 107 | do_perror("cap_set_proc"); |
| 108 | goto error; |
| 109 | } |
| 110 | cap_free(caps); |
| 111 | return 0; |
| 112 | |
| 113 | error: |
| 114 | cap_free(caps); |
| 115 | return -1; |
| 116 | } |
| 117 | |
| 118 | static int init_capabilities(void) |
| 119 | { |
| 120 | /* helper needs following capbabilities only */ |
| 121 | cap_value_t cap_list[] = { |
| 122 | CAP_CHOWN, |
| 123 | CAP_DAC_OVERRIDE, |
| 124 | CAP_FOWNER, |
| 125 | CAP_FSETID, |
| 126 | CAP_SETGID, |
| 127 | CAP_MKNOD, |
| 128 | CAP_SETUID, |
| 129 | }; |
| 130 | return do_cap_set(cap_list, ARRAY_SIZE(cap_list), 1); |
| 131 | } |
| 132 | |
| 133 | static int socket_read(int sockfd, void *buff, ssize_t size) |
| 134 | { |
| 135 | ssize_t retval, total = 0; |
| 136 | |
| 137 | while (size) { |
| 138 | retval = read(sockfd, buff, size); |
| 139 | if (retval == 0) { |
| 140 | return -EIO; |
| 141 | } |
| 142 | if (retval < 0) { |
| 143 | if (errno == EINTR) { |
| 144 | continue; |
| 145 | } |
| 146 | return -errno; |
| 147 | } |
| 148 | size -= retval; |
| 149 | buff += retval; |
| 150 | total += retval; |
| 151 | } |
| 152 | return total; |
| 153 | } |
| 154 | |
| 155 | static int socket_write(int sockfd, void *buff, ssize_t size) |
| 156 | { |
| 157 | ssize_t retval, total = 0; |
| 158 | |
| 159 | while (size) { |
| 160 | retval = write(sockfd, buff, size); |
| 161 | if (retval < 0) { |
| 162 | if (errno == EINTR) { |
| 163 | continue; |
| 164 | } |
| 165 | return -errno; |
| 166 | } |
| 167 | size -= retval; |
| 168 | buff += retval; |
| 169 | total += retval; |
| 170 | } |
| 171 | return total; |
| 172 | } |
| 173 | |
| 174 | static int read_request(int sockfd, struct iovec *iovec, ProxyHeader *header) |
| 175 | { |
| 176 | int retval; |
| 177 | |
| 178 | /* |
| 179 | * read the request header. |
| 180 | */ |
| 181 | iovec->iov_len = 0; |
| 182 | retval = socket_read(sockfd, iovec->iov_base, PROXY_HDR_SZ); |
| 183 | if (retval < 0) { |
| 184 | return retval; |
| 185 | } |
| 186 | iovec->iov_len = PROXY_HDR_SZ; |
| 187 | retval = proxy_unmarshal(iovec, 0, "dd", &header->type, &header->size); |
| 188 | if (retval < 0) { |
| 189 | return retval; |
| 190 | } |
| 191 | /* |
| 192 | * We can't process message.size > PROXY_MAX_IO_SZ. |
| 193 | * Treat it as fatal error |
| 194 | */ |
| 195 | if (header->size > PROXY_MAX_IO_SZ) { |
| 196 | return -ENOBUFS; |
| 197 | } |
| 198 | retval = socket_read(sockfd, iovec->iov_base + PROXY_HDR_SZ, header->size); |
| 199 | if (retval < 0) { |
| 200 | return retval; |
| 201 | } |
| 202 | iovec->iov_len += header->size; |
| 203 | return 0; |
| 204 | } |
| 205 | |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 206 | static int send_fd(int sockfd, int fd) |
| 207 | { |
| 208 | struct msghdr msg; |
| 209 | struct iovec iov; |
| 210 | int retval, data; |
| 211 | struct cmsghdr *cmsg; |
| 212 | union MsgControl msg_control; |
| 213 | |
| 214 | iov.iov_base = &data; |
| 215 | iov.iov_len = sizeof(data); |
| 216 | |
| 217 | memset(&msg, 0, sizeof(msg)); |
| 218 | msg.msg_iov = &iov; |
| 219 | msg.msg_iovlen = 1; |
| 220 | /* No ancillary data on error */ |
| 221 | if (fd < 0) { |
| 222 | /* fd is really negative errno if the request failed */ |
| 223 | data = fd; |
| 224 | } else { |
| 225 | data = V9FS_FD_VALID; |
| 226 | msg.msg_control = &msg_control; |
| 227 | msg.msg_controllen = sizeof(msg_control); |
| 228 | |
| 229 | cmsg = &msg_control.cmsg; |
| 230 | cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); |
| 231 | cmsg->cmsg_level = SOL_SOCKET; |
| 232 | cmsg->cmsg_type = SCM_RIGHTS; |
| 233 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); |
| 234 | } |
| 235 | |
| 236 | do { |
| 237 | retval = sendmsg(sockfd, &msg, 0); |
| 238 | } while (retval < 0 && errno == EINTR); |
| 239 | if (fd >= 0) { |
| 240 | close(fd); |
| 241 | } |
| 242 | if (retval < 0) { |
| 243 | return retval; |
| 244 | } |
| 245 | return 0; |
| 246 | } |
| 247 | |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 248 | static int send_status(int sockfd, struct iovec *iovec, int status) |
| 249 | { |
| 250 | ProxyHeader header; |
Dong Xu Wang | c7e775e | 2013-05-09 15:53:50 +0800 | [diff] [blame] | 251 | int retval, msg_size; |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 252 | |
| 253 | if (status < 0) { |
| 254 | header.type = T_ERROR; |
| 255 | } else { |
| 256 | header.type = T_SUCCESS; |
| 257 | } |
| 258 | header.size = sizeof(status); |
| 259 | /* |
| 260 | * marshal the return status. We don't check error. |
| 261 | * because we are sure we have enough space for the status |
| 262 | */ |
| 263 | msg_size = proxy_marshal(iovec, 0, "ddd", header.type, |
| 264 | header.size, status); |
| 265 | retval = socket_write(sockfd, iovec->iov_base, msg_size); |
| 266 | if (retval < 0) { |
| 267 | return retval; |
| 268 | } |
| 269 | return 0; |
| 270 | } |
| 271 | |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 272 | /* |
| 273 | * from man 7 capabilities, section |
| 274 | * Effect of User ID Changes on Capabilities: |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 275 | * If the effective user ID is changed from nonzero to 0, then the permitted |
| 276 | * set is copied to the effective set. If the effective user ID is changed |
| 277 | * from 0 to nonzero, then all capabilities are are cleared from the effective |
| 278 | * set. |
| 279 | * |
| 280 | * The setfsuid/setfsgid man pages warn that changing the effective user ID may |
| 281 | * expose the program to unwanted signals, but this is not true anymore: for an |
| 282 | * unprivileged (without CAP_KILL) program to send a signal, the real or |
| 283 | * effective user ID of the sending process must equal the real or saved user |
| 284 | * ID of the target process. Even when dropping privileges, it is enough to |
| 285 | * keep the saved UID to a "privileged" value and virtfs-proxy-helper won't |
| 286 | * be exposed to signals. So just use setresuid/setresgid. |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 287 | */ |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 288 | static int setugid(int uid, int gid, int *suid, int *sgid) |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 289 | { |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 290 | int retval; |
| 291 | |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 292 | /* |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 293 | * We still need DAC_OVERRIDE because we don't change |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 294 | * supplementary group ids, and hence may be subjected DAC rules |
| 295 | */ |
| 296 | cap_value_t cap_list[] = { |
| 297 | CAP_DAC_OVERRIDE, |
| 298 | }; |
| 299 | |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 300 | *suid = geteuid(); |
| 301 | *sgid = getegid(); |
| 302 | |
| 303 | if (setresgid(-1, gid, *sgid) == -1) { |
| 304 | retval = -errno; |
| 305 | goto err_out; |
| 306 | } |
| 307 | |
| 308 | if (setresuid(-1, uid, *suid) == -1) { |
| 309 | retval = -errno; |
| 310 | goto err_sgid; |
| 311 | } |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 312 | |
| 313 | if (uid != 0 || gid != 0) { |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 314 | if (do_cap_set(cap_list, ARRAY_SIZE(cap_list), 0) < 0) { |
| 315 | retval = -errno; |
| 316 | goto err_suid; |
| 317 | } |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 318 | } |
| 319 | return 0; |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 320 | |
| 321 | err_suid: |
| 322 | if (setresuid(-1, *suid, *suid) == -1) { |
| 323 | abort(); |
| 324 | } |
| 325 | err_sgid: |
| 326 | if (setresgid(-1, *sgid, *sgid) == -1) { |
| 327 | abort(); |
| 328 | } |
| 329 | err_out: |
| 330 | return retval; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * This is used to reset the ugid back with the saved values |
| 335 | * There is nothing much we can do checking error values here. |
| 336 | */ |
| 337 | static void resetugid(int suid, int sgid) |
| 338 | { |
| 339 | if (setresgid(-1, sgid, sgid) == -1) { |
| 340 | abort(); |
| 341 | } |
| 342 | if (setresuid(-1, suid, suid) == -1) { |
| 343 | abort(); |
| 344 | } |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 348 | * send response in two parts |
| 349 | * 1) ProxyHeader |
| 350 | * 2) Response or error status |
| 351 | * This function should be called with marshaled response |
| 352 | * send_response constructs header part and error part only. |
| 353 | * send response sends {ProxyHeader,Response} if the request was success |
| 354 | * otherwise sends {ProxyHeader,error status} |
| 355 | */ |
| 356 | static int send_response(int sock, struct iovec *iovec, int size) |
| 357 | { |
| 358 | int retval; |
| 359 | ProxyHeader header; |
| 360 | |
| 361 | /* |
| 362 | * If response size exceeds available iovec->iov_len, |
| 363 | * we return ENOBUFS |
| 364 | */ |
| 365 | if (size > PROXY_MAX_IO_SZ) { |
| 366 | size = -ENOBUFS; |
| 367 | } |
| 368 | |
| 369 | if (size < 0) { |
| 370 | /* |
| 371 | * In case of error we would not have got the error encoded |
| 372 | * already so encode the error here. |
| 373 | */ |
| 374 | header.type = T_ERROR; |
| 375 | header.size = sizeof(size); |
| 376 | proxy_marshal(iovec, PROXY_HDR_SZ, "d", size); |
| 377 | } else { |
| 378 | header.type = T_SUCCESS; |
| 379 | header.size = size; |
| 380 | } |
| 381 | proxy_marshal(iovec, 0, "dd", header.type, header.size); |
| 382 | retval = socket_write(sock, iovec->iov_base, header.size + PROXY_HDR_SZ); |
| 383 | if (retval < 0) { |
Dong Xu Wang | c7e775e | 2013-05-09 15:53:50 +0800 | [diff] [blame] | 384 | return retval; |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 385 | } |
| 386 | return 0; |
| 387 | } |
| 388 | |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 389 | /* |
| 390 | * gets generation number |
| 391 | * returns -errno on failure and sizeof(generation number) on success |
| 392 | */ |
| 393 | static int do_getversion(struct iovec *iovec, struct iovec *out_iovec) |
| 394 | { |
| 395 | uint64_t version; |
| 396 | int retval = -ENOTTY; |
| 397 | #ifdef FS_IOC_GETVERSION |
| 398 | int fd; |
| 399 | V9fsString path; |
| 400 | #endif |
| 401 | |
| 402 | |
| 403 | /* no need to issue ioctl */ |
| 404 | if (!get_version) { |
| 405 | version = 0; |
| 406 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version); |
| 407 | return retval; |
| 408 | } |
| 409 | #ifdef FS_IOC_GETVERSION |
| 410 | retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path); |
| 411 | if (retval < 0) { |
| 412 | return retval; |
| 413 | } |
| 414 | |
| 415 | fd = open(path.data, O_RDONLY); |
| 416 | if (fd < 0) { |
| 417 | retval = -errno; |
| 418 | goto err_out; |
| 419 | } |
| 420 | if (ioctl(fd, FS_IOC_GETVERSION, &version) < 0) { |
| 421 | retval = -errno; |
| 422 | } else { |
| 423 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version); |
| 424 | } |
| 425 | close(fd); |
| 426 | err_out: |
| 427 | v9fs_string_free(&path); |
| 428 | #endif |
| 429 | return retval; |
| 430 | } |
| 431 | |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 432 | static int do_getxattr(int type, struct iovec *iovec, struct iovec *out_iovec) |
| 433 | { |
| 434 | int size = 0, offset, retval; |
| 435 | V9fsString path, name, xattr; |
| 436 | |
| 437 | v9fs_string_init(&xattr); |
| 438 | v9fs_string_init(&path); |
| 439 | retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "ds", &size, &path); |
| 440 | if (retval < 0) { |
| 441 | return retval; |
| 442 | } |
| 443 | offset = PROXY_HDR_SZ + retval; |
| 444 | |
| 445 | if (size) { |
| 446 | xattr.data = g_malloc(size); |
| 447 | xattr.size = size; |
| 448 | } |
| 449 | switch (type) { |
| 450 | case T_LGETXATTR: |
| 451 | v9fs_string_init(&name); |
| 452 | retval = proxy_unmarshal(iovec, offset, "s", &name); |
| 453 | if (retval > 0) { |
| 454 | retval = lgetxattr(path.data, name.data, xattr.data, size); |
| 455 | if (retval < 0) { |
| 456 | retval = -errno; |
| 457 | } else { |
| 458 | xattr.size = retval; |
| 459 | } |
| 460 | } |
| 461 | v9fs_string_free(&name); |
| 462 | break; |
| 463 | case T_LLISTXATTR: |
| 464 | retval = llistxattr(path.data, xattr.data, size); |
| 465 | if (retval < 0) { |
| 466 | retval = -errno; |
| 467 | } else { |
| 468 | xattr.size = retval; |
| 469 | } |
| 470 | break; |
| 471 | } |
| 472 | if (retval < 0) { |
| 473 | goto err_out; |
| 474 | } |
| 475 | |
| 476 | if (!size) { |
| 477 | proxy_marshal(out_iovec, PROXY_HDR_SZ, "d", retval); |
| 478 | retval = sizeof(retval); |
| 479 | } else { |
| 480 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "s", &xattr); |
| 481 | } |
| 482 | err_out: |
| 483 | v9fs_string_free(&xattr); |
| 484 | v9fs_string_free(&path); |
| 485 | return retval; |
| 486 | } |
| 487 | |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 488 | static void stat_to_prstat(ProxyStat *pr_stat, struct stat *stat) |
| 489 | { |
| 490 | memset(pr_stat, 0, sizeof(*pr_stat)); |
| 491 | pr_stat->st_dev = stat->st_dev; |
| 492 | pr_stat->st_ino = stat->st_ino; |
| 493 | pr_stat->st_nlink = stat->st_nlink; |
| 494 | pr_stat->st_mode = stat->st_mode; |
| 495 | pr_stat->st_uid = stat->st_uid; |
| 496 | pr_stat->st_gid = stat->st_gid; |
| 497 | pr_stat->st_rdev = stat->st_rdev; |
| 498 | pr_stat->st_size = stat->st_size; |
| 499 | pr_stat->st_blksize = stat->st_blksize; |
| 500 | pr_stat->st_blocks = stat->st_blocks; |
| 501 | pr_stat->st_atim_sec = stat->st_atim.tv_sec; |
| 502 | pr_stat->st_atim_nsec = stat->st_atim.tv_nsec; |
| 503 | pr_stat->st_mtim_sec = stat->st_mtim.tv_sec; |
| 504 | pr_stat->st_mtim_nsec = stat->st_mtim.tv_nsec; |
| 505 | pr_stat->st_ctim_sec = stat->st_ctim.tv_sec; |
| 506 | pr_stat->st_ctim_nsec = stat->st_ctim.tv_nsec; |
| 507 | } |
| 508 | |
| 509 | static void statfs_to_prstatfs(ProxyStatFS *pr_stfs, struct statfs *stfs) |
| 510 | { |
| 511 | memset(pr_stfs, 0, sizeof(*pr_stfs)); |
| 512 | pr_stfs->f_type = stfs->f_type; |
| 513 | pr_stfs->f_bsize = stfs->f_bsize; |
| 514 | pr_stfs->f_blocks = stfs->f_blocks; |
| 515 | pr_stfs->f_bfree = stfs->f_bfree; |
| 516 | pr_stfs->f_bavail = stfs->f_bavail; |
| 517 | pr_stfs->f_files = stfs->f_files; |
| 518 | pr_stfs->f_ffree = stfs->f_ffree; |
| 519 | pr_stfs->f_fsid[0] = stfs->f_fsid.__val[0]; |
| 520 | pr_stfs->f_fsid[1] = stfs->f_fsid.__val[1]; |
| 521 | pr_stfs->f_namelen = stfs->f_namelen; |
| 522 | pr_stfs->f_frsize = stfs->f_frsize; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Gets stat/statfs information and packs in out_iovec structure |
| 527 | * on success returns number of bytes packed in out_iovec struture |
| 528 | * otherwise returns -errno |
| 529 | */ |
| 530 | static int do_stat(int type, struct iovec *iovec, struct iovec *out_iovec) |
| 531 | { |
| 532 | int retval; |
| 533 | V9fsString path; |
| 534 | ProxyStat pr_stat; |
| 535 | ProxyStatFS pr_stfs; |
| 536 | struct stat st_buf; |
| 537 | struct statfs stfs_buf; |
| 538 | |
| 539 | v9fs_string_init(&path); |
| 540 | retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path); |
| 541 | if (retval < 0) { |
| 542 | return retval; |
| 543 | } |
| 544 | |
| 545 | switch (type) { |
| 546 | case T_LSTAT: |
| 547 | retval = lstat(path.data, &st_buf); |
| 548 | if (retval < 0) { |
| 549 | retval = -errno; |
| 550 | } else { |
| 551 | stat_to_prstat(&pr_stat, &st_buf); |
| 552 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, |
| 553 | "qqqdddqqqqqqqqqq", pr_stat.st_dev, |
| 554 | pr_stat.st_ino, pr_stat.st_nlink, |
| 555 | pr_stat.st_mode, pr_stat.st_uid, |
| 556 | pr_stat.st_gid, pr_stat.st_rdev, |
| 557 | pr_stat.st_size, pr_stat.st_blksize, |
| 558 | pr_stat.st_blocks, |
| 559 | pr_stat.st_atim_sec, pr_stat.st_atim_nsec, |
| 560 | pr_stat.st_mtim_sec, pr_stat.st_mtim_nsec, |
| 561 | pr_stat.st_ctim_sec, pr_stat.st_ctim_nsec); |
| 562 | } |
| 563 | break; |
| 564 | case T_STATFS: |
| 565 | retval = statfs(path.data, &stfs_buf); |
| 566 | if (retval < 0) { |
| 567 | retval = -errno; |
| 568 | } else { |
| 569 | statfs_to_prstatfs(&pr_stfs, &stfs_buf); |
| 570 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, |
| 571 | "qqqqqqqqqqq", pr_stfs.f_type, |
| 572 | pr_stfs.f_bsize, pr_stfs.f_blocks, |
| 573 | pr_stfs.f_bfree, pr_stfs.f_bavail, |
| 574 | pr_stfs.f_files, pr_stfs.f_ffree, |
| 575 | pr_stfs.f_fsid[0], pr_stfs.f_fsid[1], |
| 576 | pr_stfs.f_namelen, pr_stfs.f_frsize); |
| 577 | } |
| 578 | break; |
| 579 | } |
| 580 | v9fs_string_free(&path); |
| 581 | return retval; |
| 582 | } |
| 583 | |
| 584 | static int do_readlink(struct iovec *iovec, struct iovec *out_iovec) |
| 585 | { |
| 586 | char *buffer; |
| 587 | int size, retval; |
| 588 | V9fsString target, path; |
| 589 | |
| 590 | v9fs_string_init(&path); |
| 591 | retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sd", &path, &size); |
| 592 | if (retval < 0) { |
| 593 | v9fs_string_free(&path); |
| 594 | return retval; |
| 595 | } |
| 596 | buffer = g_malloc(size); |
| 597 | v9fs_string_init(&target); |
Markus Armbruster | d77f777 | 2014-02-21 17:43:09 +0100 | [diff] [blame] | 598 | retval = readlink(path.data, buffer, size - 1); |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 599 | if (retval > 0) { |
| 600 | buffer[retval] = '\0'; |
| 601 | v9fs_string_sprintf(&target, "%s", buffer); |
| 602 | retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "s", &target); |
| 603 | } else { |
| 604 | retval = -errno; |
| 605 | } |
| 606 | g_free(buffer); |
| 607 | v9fs_string_free(&target); |
| 608 | v9fs_string_free(&path); |
| 609 | return retval; |
| 610 | } |
| 611 | |
| 612 | /* |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 613 | * create other filesystem objects and send 0 on success |
| 614 | * return -errno on error |
| 615 | */ |
| 616 | static int do_create_others(int type, struct iovec *iovec) |
| 617 | { |
| 618 | dev_t rdev; |
| 619 | int retval = 0; |
| 620 | int offset = PROXY_HDR_SZ; |
| 621 | V9fsString oldpath, path; |
| 622 | int mode, uid, gid, cur_uid, cur_gid; |
| 623 | |
| 624 | v9fs_string_init(&path); |
| 625 | v9fs_string_init(&oldpath); |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 626 | |
| 627 | retval = proxy_unmarshal(iovec, offset, "dd", &uid, &gid); |
| 628 | if (retval < 0) { |
| 629 | return retval; |
| 630 | } |
| 631 | offset += retval; |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 632 | retval = setugid(uid, gid, &cur_uid, &cur_gid); |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 633 | if (retval < 0) { |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 634 | goto unmarshal_err_out; |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 635 | } |
| 636 | switch (type) { |
| 637 | case T_MKNOD: |
| 638 | retval = proxy_unmarshal(iovec, offset, "sdq", &path, &mode, &rdev); |
| 639 | if (retval < 0) { |
| 640 | goto err_out; |
| 641 | } |
| 642 | retval = mknod(path.data, mode, rdev); |
| 643 | break; |
| 644 | case T_MKDIR: |
| 645 | retval = proxy_unmarshal(iovec, offset, "sd", &path, &mode); |
| 646 | if (retval < 0) { |
| 647 | goto err_out; |
| 648 | } |
| 649 | retval = mkdir(path.data, mode); |
| 650 | break; |
| 651 | case T_SYMLINK: |
| 652 | retval = proxy_unmarshal(iovec, offset, "ss", &oldpath, &path); |
| 653 | if (retval < 0) { |
| 654 | goto err_out; |
| 655 | } |
| 656 | retval = symlink(oldpath.data, path.data); |
| 657 | break; |
| 658 | } |
| 659 | if (retval < 0) { |
| 660 | retval = -errno; |
| 661 | } |
| 662 | |
| 663 | err_out: |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 664 | resetugid(cur_uid, cur_gid); |
| 665 | unmarshal_err_out: |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 666 | v9fs_string_free(&path); |
| 667 | v9fs_string_free(&oldpath); |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 668 | return retval; |
| 669 | } |
| 670 | |
| 671 | /* |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 672 | * create a file and send fd on success |
| 673 | * return -errno on error |
| 674 | */ |
| 675 | static int do_create(struct iovec *iovec) |
| 676 | { |
| 677 | int ret; |
| 678 | V9fsString path; |
| 679 | int flags, mode, uid, gid, cur_uid, cur_gid; |
| 680 | |
| 681 | v9fs_string_init(&path); |
| 682 | ret = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sdddd", |
| 683 | &path, &flags, &mode, &uid, &gid); |
| 684 | if (ret < 0) { |
| 685 | goto unmarshal_err_out; |
| 686 | } |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 687 | ret = setugid(uid, gid, &cur_uid, &cur_gid); |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 688 | if (ret < 0) { |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 689 | goto unmarshal_err_out; |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 690 | } |
| 691 | ret = open(path.data, flags, mode); |
| 692 | if (ret < 0) { |
| 693 | ret = -errno; |
| 694 | } |
| 695 | |
Paolo Bonzini | 9fd2ecd | 2012-10-11 14:20:23 +0200 | [diff] [blame] | 696 | resetugid(cur_uid, cur_gid); |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 697 | unmarshal_err_out: |
| 698 | v9fs_string_free(&path); |
| 699 | return ret; |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * open a file and send fd on success |
| 704 | * return -errno on error |
| 705 | */ |
| 706 | static int do_open(struct iovec *iovec) |
| 707 | { |
| 708 | int flags, ret; |
| 709 | V9fsString path; |
| 710 | |
| 711 | v9fs_string_init(&path); |
| 712 | ret = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sd", &path, &flags); |
| 713 | if (ret < 0) { |
| 714 | goto err_out; |
| 715 | } |
| 716 | ret = open(path.data, flags); |
| 717 | if (ret < 0) { |
| 718 | ret = -errno; |
| 719 | } |
| 720 | err_out: |
| 721 | v9fs_string_free(&path); |
| 722 | return ret; |
| 723 | } |
| 724 | |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 725 | /* create unix domain socket and return the descriptor */ |
| 726 | static int proxy_socket(const char *path, uid_t uid, gid_t gid) |
| 727 | { |
| 728 | int sock, client; |
| 729 | struct sockaddr_un proxy, qemu; |
| 730 | socklen_t size; |
| 731 | |
| 732 | /* requested socket already exists, refuse to start */ |
| 733 | if (!access(path, F_OK)) { |
| 734 | do_log(LOG_CRIT, "socket already exists\n"); |
| 735 | return -1; |
| 736 | } |
| 737 | |
| 738 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 739 | if (sock < 0) { |
| 740 | do_perror("socket"); |
| 741 | return -1; |
| 742 | } |
| 743 | |
| 744 | /* mask other part of mode bits */ |
| 745 | umask(7); |
| 746 | |
| 747 | proxy.sun_family = AF_UNIX; |
| 748 | strcpy(proxy.sun_path, path); |
| 749 | if (bind(sock, (struct sockaddr *)&proxy, |
| 750 | sizeof(struct sockaddr_un)) < 0) { |
| 751 | do_perror("bind"); |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 752 | goto error; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 753 | } |
| 754 | if (chown(proxy.sun_path, uid, gid) < 0) { |
| 755 | do_perror("chown"); |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 756 | goto error; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 757 | } |
| 758 | if (listen(sock, 1) < 0) { |
| 759 | do_perror("listen"); |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 760 | goto error; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 761 | } |
| 762 | |
Tim Comer | b0f9300 | 2014-04-19 13:39:57 -0400 | [diff] [blame] | 763 | size = sizeof(qemu); |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 764 | client = accept(sock, (struct sockaddr *)&qemu, &size); |
| 765 | if (client < 0) { |
| 766 | do_perror("accept"); |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 767 | goto error; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 768 | } |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 769 | close(sock); |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 770 | return client; |
Gonglei | 88ea8ed | 2014-11-13 20:17:06 +0800 | [diff] [blame] | 771 | |
| 772 | error: |
| 773 | close(sock); |
| 774 | return -1; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 775 | } |
| 776 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 777 | static void usage(char *prog) |
| 778 | { |
| 779 | fprintf(stderr, "usage: %s\n" |
| 780 | " -p|--path <path> 9p path to export\n" |
| 781 | " {-f|--fd <socket-descriptor>} socket file descriptor to be used\n" |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 782 | " {-s|--socket <socketname> socket file used for communication\n" |
| 783 | " \t-u|--uid <uid> -g|--gid <gid>} - uid:gid combination to give " |
| 784 | " access to this socket\n" |
| 785 | " \tNote: -s & -f can not be used together\n" |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 786 | " [-n|--nodaemon] Run as a normal program\n", |
| 787 | basename(prog)); |
| 788 | } |
| 789 | |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 790 | static int process_reply(int sock, int type, |
| 791 | struct iovec *out_iovec, int retval) |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 792 | { |
| 793 | switch (type) { |
| 794 | case T_OPEN: |
| 795 | case T_CREATE: |
| 796 | if (send_fd(sock, retval) < 0) { |
| 797 | return -1; |
| 798 | } |
| 799 | break; |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 800 | case T_MKNOD: |
| 801 | case T_MKDIR: |
| 802 | case T_SYMLINK: |
| 803 | case T_LINK: |
M. Mohan Kumar | ea75fc4 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 804 | case T_CHMOD: |
| 805 | case T_CHOWN: |
| 806 | case T_TRUNCATE: |
| 807 | case T_UTIME: |
| 808 | case T_RENAME: |
| 809 | case T_REMOVE: |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 810 | case T_LSETXATTR: |
| 811 | case T_LREMOVEXATTR: |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 812 | if (send_status(sock, out_iovec, retval) < 0) { |
| 813 | return -1; |
| 814 | } |
| 815 | break; |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 816 | case T_LSTAT: |
| 817 | case T_STATFS: |
| 818 | case T_READLINK: |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 819 | case T_LGETXATTR: |
| 820 | case T_LLISTXATTR: |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 821 | case T_GETVERSION: |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 822 | if (send_response(sock, out_iovec, retval) < 0) { |
| 823 | return -1; |
| 824 | } |
| 825 | break; |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 826 | default: |
| 827 | return -1; |
| 828 | break; |
| 829 | } |
| 830 | return 0; |
| 831 | } |
| 832 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 833 | static int process_requests(int sock) |
| 834 | { |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 835 | int flags; |
| 836 | int size = 0; |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 837 | int retval = 0; |
M. Mohan Kumar | ea75fc4 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 838 | uint64_t offset; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 839 | ProxyHeader header; |
M. Mohan Kumar | ea75fc4 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 840 | int mode, uid, gid; |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 841 | V9fsString name, value; |
M. Mohan Kumar | ea75fc4 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 842 | struct timespec spec[2]; |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 843 | V9fsString oldpath, path; |
| 844 | struct iovec in_iovec, out_iovec; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 845 | |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 846 | in_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ); |
| 847 | in_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ; |
| 848 | out_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ); |
| 849 | out_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ; |
| 850 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 851 | while (1) { |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 852 | /* |
| 853 | * initialize the header type, so that we send |
| 854 | * response to proper request type. |
| 855 | */ |
| 856 | header.type = 0; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 857 | retval = read_request(sock, &in_iovec, &header); |
| 858 | if (retval < 0) { |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 859 | goto err_out; |
| 860 | } |
| 861 | |
| 862 | switch (header.type) { |
| 863 | case T_OPEN: |
| 864 | retval = do_open(&in_iovec); |
| 865 | break; |
| 866 | case T_CREATE: |
| 867 | retval = do_create(&in_iovec); |
| 868 | break; |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 869 | case T_MKNOD: |
| 870 | case T_MKDIR: |
| 871 | case T_SYMLINK: |
| 872 | retval = do_create_others(header.type, &in_iovec); |
| 873 | break; |
| 874 | case T_LINK: |
| 875 | v9fs_string_init(&path); |
| 876 | v9fs_string_init(&oldpath); |
| 877 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, |
| 878 | "ss", &oldpath, &path); |
| 879 | if (retval > 0) { |
| 880 | retval = link(oldpath.data, path.data); |
| 881 | if (retval < 0) { |
| 882 | retval = -errno; |
| 883 | } |
| 884 | } |
| 885 | v9fs_string_free(&oldpath); |
| 886 | v9fs_string_free(&path); |
| 887 | break; |
M. Mohan Kumar | b178adc | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 888 | case T_LSTAT: |
| 889 | case T_STATFS: |
| 890 | retval = do_stat(header.type, &in_iovec, &out_iovec); |
| 891 | break; |
| 892 | case T_READLINK: |
| 893 | retval = do_readlink(&in_iovec, &out_iovec); |
| 894 | break; |
M. Mohan Kumar | ea75fc4 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 895 | case T_CHMOD: |
| 896 | v9fs_string_init(&path); |
| 897 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, |
| 898 | "sd", &path, &mode); |
| 899 | if (retval > 0) { |
| 900 | retval = chmod(path.data, mode); |
| 901 | if (retval < 0) { |
| 902 | retval = -errno; |
| 903 | } |
| 904 | } |
| 905 | v9fs_string_free(&path); |
| 906 | break; |
| 907 | case T_CHOWN: |
| 908 | v9fs_string_init(&path); |
| 909 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sdd", &path, |
| 910 | &uid, &gid); |
| 911 | if (retval > 0) { |
| 912 | retval = lchown(path.data, uid, gid); |
| 913 | if (retval < 0) { |
| 914 | retval = -errno; |
| 915 | } |
| 916 | } |
| 917 | v9fs_string_free(&path); |
| 918 | break; |
| 919 | case T_TRUNCATE: |
| 920 | v9fs_string_init(&path); |
| 921 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sq", |
| 922 | &path, &offset); |
| 923 | if (retval > 0) { |
| 924 | retval = truncate(path.data, offset); |
| 925 | if (retval < 0) { |
| 926 | retval = -errno; |
| 927 | } |
| 928 | } |
| 929 | v9fs_string_free(&path); |
| 930 | break; |
| 931 | case T_UTIME: |
| 932 | v9fs_string_init(&path); |
| 933 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sqqqq", &path, |
| 934 | &spec[0].tv_sec, &spec[0].tv_nsec, |
| 935 | &spec[1].tv_sec, &spec[1].tv_nsec); |
| 936 | if (retval > 0) { |
| 937 | retval = qemu_utimens(path.data, spec); |
| 938 | if (retval < 0) { |
| 939 | retval = -errno; |
| 940 | } |
| 941 | } |
| 942 | v9fs_string_free(&path); |
| 943 | break; |
| 944 | case T_RENAME: |
| 945 | v9fs_string_init(&path); |
| 946 | v9fs_string_init(&oldpath); |
| 947 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, |
| 948 | "ss", &oldpath, &path); |
| 949 | if (retval > 0) { |
| 950 | retval = rename(oldpath.data, path.data); |
| 951 | if (retval < 0) { |
| 952 | retval = -errno; |
| 953 | } |
| 954 | } |
| 955 | v9fs_string_free(&oldpath); |
| 956 | v9fs_string_free(&path); |
| 957 | break; |
| 958 | case T_REMOVE: |
| 959 | v9fs_string_init(&path); |
| 960 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "s", &path); |
| 961 | if (retval > 0) { |
| 962 | retval = remove(path.data); |
| 963 | if (retval < 0) { |
| 964 | retval = -errno; |
| 965 | } |
| 966 | } |
| 967 | v9fs_string_free(&path); |
| 968 | break; |
M. Mohan Kumar | d52b09e | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 969 | case T_LGETXATTR: |
| 970 | case T_LLISTXATTR: |
| 971 | retval = do_getxattr(header.type, &in_iovec, &out_iovec); |
| 972 | break; |
| 973 | case T_LSETXATTR: |
| 974 | v9fs_string_init(&path); |
| 975 | v9fs_string_init(&name); |
| 976 | v9fs_string_init(&value); |
| 977 | retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sssdd", &path, |
| 978 | &name, &value, &size, &flags); |
| 979 | if (retval > 0) { |
| 980 | retval = lsetxattr(path.data, |
| 981 | name.data, value.data, size, flags); |
| 982 | if (retval < 0) { |
| 983 | retval = -errno; |
| 984 | } |
| 985 | } |
| 986 | v9fs_string_free(&path); |
| 987 | v9fs_string_free(&name); |
| 988 | v9fs_string_free(&value); |
| 989 | break; |
| 990 | case T_LREMOVEXATTR: |
| 991 | v9fs_string_init(&path); |
| 992 | v9fs_string_init(&name); |
| 993 | retval = proxy_unmarshal(&in_iovec, |
| 994 | PROXY_HDR_SZ, "ss", &path, &name); |
| 995 | if (retval > 0) { |
| 996 | retval = lremovexattr(path.data, name.data); |
| 997 | if (retval < 0) { |
| 998 | retval = -errno; |
| 999 | } |
| 1000 | } |
| 1001 | v9fs_string_free(&path); |
| 1002 | v9fs_string_free(&name); |
| 1003 | break; |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 1004 | case T_GETVERSION: |
| 1005 | retval = do_getversion(&in_iovec, &out_iovec); |
| 1006 | break; |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 1007 | default: |
| 1008 | goto err_out; |
| 1009 | break; |
| 1010 | } |
| 1011 | |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 1012 | if (process_reply(sock, header.type, &out_iovec, retval) < 0) { |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 1013 | goto err_out; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1014 | } |
| 1015 | } |
M. Mohan Kumar | daf0b9a | 2011-12-14 13:58:44 +0530 | [diff] [blame] | 1016 | err_out: |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1017 | g_free(in_iovec.iov_base); |
M. Mohan Kumar | 39f8c32 | 2011-12-14 13:58:45 +0530 | [diff] [blame] | 1018 | g_free(out_iovec.iov_base); |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1019 | return -1; |
| 1020 | } |
| 1021 | |
| 1022 | int main(int argc, char **argv) |
| 1023 | { |
| 1024 | int sock; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1025 | uid_t own_u; |
| 1026 | gid_t own_g; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1027 | char *rpath = NULL; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1028 | char *sock_name = NULL; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1029 | struct stat stbuf; |
| 1030 | int c, option_index; |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 1031 | #ifdef FS_IOC_GETVERSION |
| 1032 | int retval; |
| 1033 | struct statfs st_fs; |
| 1034 | #endif |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1035 | |
| 1036 | is_daemon = true; |
| 1037 | sock = -1; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1038 | own_u = own_g = -1; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1039 | while (1) { |
| 1040 | option_index = 0; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1041 | c = getopt_long(argc, argv, "p:nh?f:s:u:g:", helper_opts, |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1042 | &option_index); |
| 1043 | if (c == -1) { |
| 1044 | break; |
| 1045 | } |
| 1046 | switch (c) { |
| 1047 | case 'p': |
Markus Armbruster | 606017d | 2013-01-22 11:08:01 +0100 | [diff] [blame] | 1048 | rpath = g_strdup(optarg); |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1049 | break; |
| 1050 | case 'n': |
| 1051 | is_daemon = false; |
| 1052 | break; |
| 1053 | case 'f': |
| 1054 | sock = atoi(optarg); |
| 1055 | break; |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1056 | case 's': |
Markus Armbruster | 606017d | 2013-01-22 11:08:01 +0100 | [diff] [blame] | 1057 | sock_name = g_strdup(optarg); |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1058 | break; |
| 1059 | case 'u': |
| 1060 | own_u = atoi(optarg); |
| 1061 | break; |
| 1062 | case 'g': |
| 1063 | own_g = atoi(optarg); |
| 1064 | break; |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1065 | case '?': |
| 1066 | case 'h': |
| 1067 | default: |
| 1068 | usage(argv[0]); |
| 1069 | exit(EXIT_FAILURE); |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | /* Parameter validation */ |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1074 | if ((sock_name == NULL && sock == -1) || rpath == NULL) { |
| 1075 | fprintf(stderr, "socket, socket descriptor or path not specified\n"); |
| 1076 | usage(argv[0]); |
| 1077 | return -1; |
| 1078 | } |
| 1079 | |
M. Mohan Kumar | 5fc6dba | 2012-01-19 16:15:56 +0530 | [diff] [blame] | 1080 | if (sock_name && sock != -1) { |
| 1081 | fprintf(stderr, "both named socket and socket descriptor specified\n"); |
| 1082 | usage(argv[0]); |
| 1083 | exit(EXIT_FAILURE); |
| 1084 | } |
| 1085 | |
| 1086 | if (sock_name && (own_u == -1 || own_g == -1)) { |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1087 | fprintf(stderr, "owner uid:gid not specified, "); |
| 1088 | fprintf(stderr, |
| 1089 | "owner uid:gid specifies who can access the socket file\n"); |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1090 | usage(argv[0]); |
| 1091 | exit(EXIT_FAILURE); |
| 1092 | } |
| 1093 | |
| 1094 | if (lstat(rpath, &stbuf) < 0) { |
| 1095 | fprintf(stderr, "invalid path \"%s\" specified, %s\n", |
| 1096 | rpath, strerror(errno)); |
| 1097 | exit(EXIT_FAILURE); |
| 1098 | } |
| 1099 | |
| 1100 | if (!S_ISDIR(stbuf.st_mode)) { |
| 1101 | fprintf(stderr, "specified path \"%s\" is not directory\n", rpath); |
| 1102 | exit(EXIT_FAILURE); |
| 1103 | } |
| 1104 | |
| 1105 | if (is_daemon) { |
| 1106 | if (daemon(0, 0) < 0) { |
| 1107 | fprintf(stderr, "daemon call failed\n"); |
| 1108 | exit(EXIT_FAILURE); |
| 1109 | } |
| 1110 | openlog(PROGNAME, LOG_PID, LOG_DAEMON); |
| 1111 | } |
| 1112 | |
| 1113 | do_log(LOG_INFO, "Started\n"); |
M. Mohan Kumar | 5fc6dba | 2012-01-19 16:15:56 +0530 | [diff] [blame] | 1114 | if (sock_name) { |
M. Mohan Kumar | 84a87cc | 2011-12-14 13:58:47 +0530 | [diff] [blame] | 1115 | sock = proxy_socket(sock_name, own_u, own_g); |
| 1116 | if (sock < 0) { |
| 1117 | goto error; |
| 1118 | } |
| 1119 | } |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1120 | |
M. Mohan Kumar | d090e45 | 2011-12-14 13:58:46 +0530 | [diff] [blame] | 1121 | get_version = false; |
| 1122 | #ifdef FS_IOC_GETVERSION |
| 1123 | /* check whether underlying FS support IOC_GETVERSION */ |
| 1124 | retval = statfs(rpath, &st_fs); |
| 1125 | if (!retval) { |
| 1126 | switch (st_fs.f_type) { |
| 1127 | case EXT2_SUPER_MAGIC: |
| 1128 | case BTRFS_SUPER_MAGIC: |
| 1129 | case REISERFS_SUPER_MAGIC: |
| 1130 | case XFS_SUPER_MAGIC: |
| 1131 | get_version = true; |
| 1132 | break; |
| 1133 | } |
| 1134 | } |
| 1135 | #endif |
| 1136 | |
M. Mohan Kumar | 17bff52 | 2011-12-14 13:58:42 +0530 | [diff] [blame] | 1137 | if (chdir("/") < 0) { |
| 1138 | do_perror("chdir"); |
| 1139 | goto error; |
| 1140 | } |
| 1141 | if (chroot(rpath) < 0) { |
| 1142 | do_perror("chroot"); |
| 1143 | goto error; |
| 1144 | } |
| 1145 | umask(0); |
| 1146 | |
| 1147 | if (init_capabilities() < 0) { |
| 1148 | goto error; |
| 1149 | } |
| 1150 | |
| 1151 | process_requests(sock); |
| 1152 | error: |
| 1153 | do_log(LOG_INFO, "Done\n"); |
| 1154 | closelog(); |
| 1155 | return 0; |
| 1156 | } |