1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #include <dirent.h> 7 #include <errno.h> 8 #include <fcntl.h> 9 #include <getopt.h> 10 #include <stdio.h> 11 #include <stdint.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <termios.h> 15 #include <time.h> 16 #include <unistd.h> 17 #include <sys/mman.h> 18 #include <sys/stat.h> 19 #include <sys/time.h> 20 #include <sys/types.h> 21 #include <linux/types.h> 22 23 #include <asm/getopt.h> 24 #include <asm/sections.h> 25 #include <asm/state.h> 26 #include <os.h> 27 28 /* Operating System Interface */ 29 30 struct os_mem_hdr { 31 size_t length; /* number of bytes in the block */ 32 }; 33 34 ssize_t os_read(int fd, void *buf, size_t count) 35 { 36 return read(fd, buf, count); 37 } 38 39 ssize_t os_read_no_block(int fd, void *buf, size_t count) 40 { 41 const int flags = fcntl(fd, F_GETFL, 0); 42 43 fcntl(fd, F_SETFL, flags | O_NONBLOCK); 44 return os_read(fd, buf, count); 45 } 46 47 ssize_t os_write(int fd, const void *buf, size_t count) 48 { 49 return write(fd, buf, count); 50 } 51 52 off_t os_lseek(int fd, off_t offset, int whence) 53 { 54 if (whence == OS_SEEK_SET) 55 whence = SEEK_SET; 56 else if (whence == OS_SEEK_CUR) 57 whence = SEEK_CUR; 58 else if (whence == OS_SEEK_END) 59 whence = SEEK_END; 60 else 61 os_exit(1); 62 return lseek(fd, offset, whence); 63 } 64 65 int os_open(const char *pathname, int os_flags) 66 { 67 int flags; 68 69 switch (os_flags & OS_O_MASK) { 70 case OS_O_RDONLY: 71 default: 72 flags = O_RDONLY; 73 break; 74 75 case OS_O_WRONLY: 76 flags = O_WRONLY; 77 break; 78 79 case OS_O_RDWR: 80 flags = O_RDWR; 81 break; 82 } 83 84 if (os_flags & OS_O_CREAT) 85 flags |= O_CREAT; 86 87 return open(pathname, flags, 0777); 88 } 89 90 int os_close(int fd) 91 { 92 return close(fd); 93 } 94 95 void os_exit(int exit_code) 96 { 97 exit(exit_code); 98 } 99 100 /* Restore tty state when we exit */ 101 static struct termios orig_term; 102 103 static void os_fd_restore(void) 104 { 105 tcsetattr(0, TCSANOW, &orig_term); 106 } 107 108 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 109 void os_tty_raw(int fd) 110 { 111 static int setup = 0; 112 struct termios term; 113 114 if (setup) 115 return; 116 setup = 1; 117 118 /* If not a tty, don't complain */ 119 if (tcgetattr(fd, &orig_term)) 120 return; 121 122 term = orig_term; 123 term.c_iflag = IGNBRK | IGNPAR; 124 term.c_oflag = OPOST | ONLCR; 125 term.c_cflag = CS8 | CREAD | CLOCAL; 126 term.c_lflag = 0; 127 if (tcsetattr(fd, TCSANOW, &term)) 128 return; 129 130 atexit(os_fd_restore); 131 } 132 133 void *os_malloc(size_t length) 134 { 135 struct os_mem_hdr *hdr; 136 137 hdr = mmap(NULL, length + sizeof(*hdr), PROT_READ | PROT_WRITE, 138 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 139 if (hdr == MAP_FAILED) 140 return NULL; 141 hdr->length = length; 142 143 return hdr + 1; 144 } 145 146 void os_free(void *ptr) 147 { 148 struct os_mem_hdr *hdr = ptr; 149 150 hdr--; 151 if (ptr) 152 munmap(hdr, hdr->length + sizeof(*hdr)); 153 } 154 155 void *os_realloc(void *ptr, size_t length) 156 { 157 struct os_mem_hdr *hdr = ptr; 158 void *buf = NULL; 159 160 hdr--; 161 if (length != 0) { 162 buf = os_malloc(length); 163 if (!buf) 164 return buf; 165 if (ptr) { 166 if (length > hdr->length) 167 length = hdr->length; 168 memcpy(buf, ptr, length); 169 } 170 } 171 os_free(ptr); 172 173 return buf; 174 } 175 176 void os_usleep(unsigned long usec) 177 { 178 usleep(usec); 179 } 180 181 uint64_t __attribute__((no_instrument_function)) os_get_nsec(void) 182 { 183 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 184 struct timespec tp; 185 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 186 struct timeval tv; 187 188 gettimeofday(&tv, NULL); 189 tp.tv_sec = tv.tv_sec; 190 tp.tv_nsec = tv.tv_usec * 1000; 191 } 192 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 193 #else 194 struct timeval tv; 195 gettimeofday(&tv, NULL); 196 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 197 #endif 198 } 199 200 static char *short_opts; 201 static struct option *long_opts; 202 203 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]) 204 { 205 struct sandbox_cmdline_option **sb_opt = __u_boot_sandbox_option_start; 206 size_t num_options = __u_boot_sandbox_option_count(); 207 size_t i; 208 209 int hidden_short_opt; 210 size_t si; 211 212 int c; 213 214 if (short_opts || long_opts) 215 return 1; 216 217 state->argc = argc; 218 state->argv = argv; 219 220 /* dynamically construct the arguments to the system getopt_long */ 221 short_opts = os_malloc(sizeof(*short_opts) * num_options * 2 + 1); 222 long_opts = os_malloc(sizeof(*long_opts) * num_options); 223 if (!short_opts || !long_opts) 224 return 1; 225 226 /* 227 * getopt_long requires "val" to be unique (since that is what the 228 * func returns), so generate unique values automatically for flags 229 * that don't have a short option. pick 0x100 as that is above the 230 * single byte range (where ASCII/ISO-XXXX-X charsets live). 231 */ 232 hidden_short_opt = 0x100; 233 si = 0; 234 for (i = 0; i < num_options; ++i) { 235 long_opts[i].name = sb_opt[i]->flag; 236 long_opts[i].has_arg = sb_opt[i]->has_arg ? 237 required_argument : no_argument; 238 long_opts[i].flag = NULL; 239 240 if (sb_opt[i]->flag_short) { 241 short_opts[si++] = long_opts[i].val = sb_opt[i]->flag_short; 242 if (long_opts[i].has_arg == required_argument) 243 short_opts[si++] = ':'; 244 } else 245 long_opts[i].val = sb_opt[i]->flag_short = hidden_short_opt++; 246 } 247 short_opts[si] = '\0'; 248 249 /* we need to handle output ourselves since u-boot provides printf */ 250 opterr = 0; 251 252 /* 253 * walk all of the options the user gave us on the command line, 254 * figure out what u-boot option structure they belong to (via 255 * the unique short val key), and call the appropriate callback. 256 */ 257 while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) { 258 for (i = 0; i < num_options; ++i) { 259 if (sb_opt[i]->flag_short == c) { 260 if (sb_opt[i]->callback(state, optarg)) { 261 state->parse_err = sb_opt[i]->flag; 262 return 0; 263 } 264 break; 265 } 266 } 267 if (i == num_options) { 268 /* 269 * store the faulting flag for later display. we have to 270 * store the flag itself as the getopt parsing itself is 271 * tricky: need to handle the following flags (assume all 272 * of the below are unknown): 273 * -a optopt='a' optind=<next> 274 * -abbbb optopt='a' optind=<this> 275 * -aaaaa optopt='a' optind=<this> 276 * --a optopt=0 optind=<this> 277 * as you can see, it is impossible to determine the exact 278 * faulting flag without doing the parsing ourselves, so 279 * we just report the specific flag that failed. 280 */ 281 if (optopt) { 282 static char parse_err[3] = { '-', 0, '\0', }; 283 parse_err[1] = optopt; 284 state->parse_err = parse_err; 285 } else 286 state->parse_err = argv[optind - 1]; 287 break; 288 } 289 } 290 291 return 0; 292 } 293 294 void os_dirent_free(struct os_dirent_node *node) 295 { 296 struct os_dirent_node *next; 297 298 while (node) { 299 next = node->next; 300 free(node); 301 node = next; 302 } 303 } 304 305 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp) 306 { 307 struct dirent entry, *result; 308 struct os_dirent_node *head, *node, *next; 309 struct stat buf; 310 DIR *dir; 311 int ret; 312 char *fname; 313 int len; 314 315 *headp = NULL; 316 dir = opendir(dirname); 317 if (!dir) 318 return -1; 319 320 /* Create a buffer for the maximum filename length */ 321 len = sizeof(entry.d_name) + strlen(dirname) + 2; 322 fname = malloc(len); 323 if (!fname) { 324 ret = -ENOMEM; 325 goto done; 326 } 327 328 for (node = head = NULL;; node = next) { 329 ret = readdir_r(dir, &entry, &result); 330 if (ret || !result) 331 break; 332 next = malloc(sizeof(*node) + strlen(entry.d_name) + 1); 333 if (!next) { 334 os_dirent_free(head); 335 ret = -ENOMEM; 336 goto done; 337 } 338 strcpy(next->name, entry.d_name); 339 switch (entry.d_type) { 340 case DT_REG: 341 next->type = OS_FILET_REG; 342 break; 343 case DT_DIR: 344 next->type = OS_FILET_DIR; 345 break; 346 case DT_LNK: 347 next->type = OS_FILET_LNK; 348 break; 349 } 350 next->size = 0; 351 snprintf(fname, len, "%s/%s", dirname, next->name); 352 if (!stat(fname, &buf)) 353 next->size = buf.st_size; 354 if (node) 355 node->next = next; 356 if (!head) 357 head = node; 358 } 359 *headp = head; 360 361 done: 362 closedir(dir); 363 return ret; 364 } 365 366 const char *os_dirent_typename[OS_FILET_COUNT] = { 367 " ", 368 "SYM", 369 "DIR", 370 "???", 371 }; 372 373 const char *os_dirent_get_typename(enum os_dirent_t type) 374 { 375 if (type >= 0 && type < OS_FILET_COUNT) 376 return os_dirent_typename[type]; 377 378 return os_dirent_typename[OS_FILET_UNKNOWN]; 379 } 380 381 ssize_t os_get_filesize(const char *fname) 382 { 383 struct stat buf; 384 int ret; 385 386 ret = stat(fname, &buf); 387 if (ret) 388 return ret; 389 return buf.st_size; 390 } 391 392 void os_putc(int ch) 393 { 394 putchar(ch); 395 } 396 397 void os_puts(const char *str) 398 { 399 while (*str) 400 os_putc(*str++); 401 } 402 403 int os_write_ram_buf(const char *fname) 404 { 405 struct sandbox_state *state = state_get_current(); 406 int fd, ret; 407 408 fd = open(fname, O_CREAT | O_WRONLY, 0777); 409 if (fd < 0) 410 return -ENOENT; 411 ret = write(fd, state->ram_buf, state->ram_size); 412 close(fd); 413 if (ret != state->ram_size) 414 return -EIO; 415 416 return 0; 417 } 418 419 int os_read_ram_buf(const char *fname) 420 { 421 struct sandbox_state *state = state_get_current(); 422 int fd, ret; 423 int size; 424 425 size = os_get_filesize(fname); 426 if (size < 0) 427 return -ENOENT; 428 if (size != state->ram_size) 429 return -ENOSPC; 430 fd = open(fname, O_RDONLY); 431 if (fd < 0) 432 return -ENOENT; 433 434 ret = read(fd, state->ram_buf, state->ram_size); 435 close(fd); 436 if (ret != state->ram_size) 437 return -EIO; 438 439 return 0; 440 } 441