Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Utility routines. |
| 4 | * |
| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| 6 | * Copyright (C) 2006 Rob Landley |
| 7 | * Copyright (C) 2006 Denys Vlasenko |
| 8 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 9 | * Licensed under GPLv2, see file LICENSE in this source tree. |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | /* We need to have separate xfuncs.c and xfuncs_printf.c because |
| 13 | * with current linkers, even with section garbage collection, |
| 14 | * if *.o module references any of XXXprintf functions, you pull in |
| 15 | * entire printf machinery. Even if you do not use the function |
| 16 | * which uses XXXprintf. |
| 17 | * |
| 18 | * xfuncs.c contains functions (not necessarily xfuncs) |
| 19 | * which do not pull in printf, directly or indirectly. |
| 20 | * xfunc_printf.c contains those which do. |
| 21 | */ |
| 22 | |
| 23 | #include "libbb.h" |
| 24 | |
| 25 | |
| 26 | /* All the functions starting with "x" call bb_error_msg_and_die() if they |
| 27 | * fail, so callers never need to check for errors. If it returned, it |
| 28 | * succeeded. */ |
| 29 | |
| 30 | #ifndef DMALLOC |
| 31 | /* dmalloc provides variants of these that do abort() on failure. |
| 32 | * Since dmalloc's prototypes overwrite the impls here as they are |
| 33 | * included after these prototypes in libbb.h, all is well. |
| 34 | */ |
| 35 | // Warn if we can't allocate size bytes of memory. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 36 | void* FAST_FUNC malloc_or_warn(size_t size) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 37 | { |
| 38 | void *ptr = malloc(size); |
| 39 | if (ptr == NULL && size != 0) |
| 40 | bb_error_msg(bb_msg_memory_exhausted); |
| 41 | return ptr; |
| 42 | } |
| 43 | |
| 44 | // Die if we can't allocate size bytes of memory. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 45 | void* FAST_FUNC xmalloc(size_t size) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 46 | { |
| 47 | void *ptr = malloc(size); |
| 48 | if (ptr == NULL && size != 0) |
| 49 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 50 | return ptr; |
| 51 | } |
| 52 | |
| 53 | // Die if we can't resize previously allocated memory. (This returns a pointer |
| 54 | // to the new memory, which may or may not be the same as the old memory. |
| 55 | // It'll copy the contents to a new chunk and free the old one if necessary.) |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 56 | void* FAST_FUNC xrealloc(void *ptr, size_t size) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 57 | { |
| 58 | ptr = realloc(ptr, size); |
| 59 | if (ptr == NULL && size != 0) |
| 60 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 61 | return ptr; |
| 62 | } |
| 63 | #endif /* DMALLOC */ |
| 64 | |
| 65 | // Die if we can't allocate and zero size bytes of memory. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 66 | void* FAST_FUNC xzalloc(size_t size) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 67 | { |
| 68 | void *ptr = xmalloc(size); |
| 69 | memset(ptr, 0, size); |
| 70 | return ptr; |
| 71 | } |
| 72 | |
| 73 | // Die if we can't copy a string to freshly allocated memory. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 74 | char* FAST_FUNC xstrdup(const char *s) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 75 | { |
| 76 | char *t; |
| 77 | |
| 78 | if (s == NULL) |
| 79 | return NULL; |
| 80 | |
| 81 | t = strdup(s); |
| 82 | |
| 83 | if (t == NULL) |
| 84 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 85 | |
| 86 | return t; |
| 87 | } |
| 88 | |
| 89 | // Die if we can't allocate n+1 bytes (space for the null terminator) and copy |
| 90 | // the (possibly truncated to length n) string into it. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 91 | char* FAST_FUNC xstrndup(const char *s, int n) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 92 | { |
| 93 | int m; |
| 94 | char *t; |
| 95 | |
| 96 | if (ENABLE_DEBUG && s == NULL) |
| 97 | bb_error_msg_and_die("xstrndup bug"); |
| 98 | |
| 99 | /* We can just xmalloc(n+1) and strncpy into it, */ |
| 100 | /* but think about xstrndup("abc", 10000) wastage! */ |
| 101 | m = n; |
| 102 | t = (char*) s; |
| 103 | while (m) { |
| 104 | if (!*t) break; |
| 105 | m--; |
| 106 | t++; |
| 107 | } |
| 108 | n -= m; |
| 109 | t = xmalloc(n + 1); |
| 110 | t[n] = '\0'; |
| 111 | |
| 112 | return memcpy(t, s, n); |
| 113 | } |
| 114 | |
Ron Yorston | d840c5d | 2015-07-19 23:05:20 +0200 | [diff] [blame] | 115 | void* FAST_FUNC xmemdup(const void *s, int n) |
| 116 | { |
| 117 | return memcpy(xmalloc(n), s, n); |
| 118 | } |
| 119 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 120 | // Die if we can't open a file and return a FILE* to it. |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 121 | // Notice we haven't got xfread(), This is for use with fscanf() and friends. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 122 | FILE* FAST_FUNC xfopen(const char *path, const char *mode) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 123 | { |
| 124 | FILE *fp = fopen(path, mode); |
| 125 | if (fp == NULL) |
| 126 | bb_perror_msg_and_die("can't open '%s'", path); |
| 127 | return fp; |
| 128 | } |
| 129 | |
| 130 | // Die if we can't open a file and return a fd. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 131 | int FAST_FUNC xopen3(const char *pathname, int flags, int mode) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 132 | { |
| 133 | int ret; |
| 134 | |
| 135 | ret = open(pathname, flags, mode); |
| 136 | if (ret < 0) { |
| 137 | bb_perror_msg_and_die("can't open '%s'", pathname); |
| 138 | } |
| 139 | return ret; |
| 140 | } |
| 141 | |
Denys Vlasenko | c05387d | 2010-10-18 02:38:27 +0200 | [diff] [blame] | 142 | // Die if we can't open a file and return a fd. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 143 | int FAST_FUNC xopen(const char *pathname, int flags) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 144 | { |
| 145 | return xopen3(pathname, flags, 0666); |
| 146 | } |
| 147 | |
| 148 | // Warn if we can't open a file and return a fd. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 149 | int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 150 | { |
| 151 | int ret; |
| 152 | |
| 153 | ret = open(pathname, flags, mode); |
| 154 | if (ret < 0) { |
| 155 | bb_perror_msg("can't open '%s'", pathname); |
| 156 | } |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | // Warn if we can't open a file and return a fd. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 161 | int FAST_FUNC open_or_warn(const char *pathname, int flags) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 162 | { |
| 163 | return open3_or_warn(pathname, flags, 0666); |
| 164 | } |
| 165 | |
Ryan Mallon | 5906a5c | 2013-10-08 14:52:49 +0200 | [diff] [blame] | 166 | /* Die if we can't open an existing file readonly with O_NONBLOCK |
| 167 | * and return the fd. |
| 168 | * Note that for ioctl O_RDONLY is sufficient. |
| 169 | */ |
| 170 | int FAST_FUNC xopen_nonblocking(const char *pathname) |
| 171 | { |
| 172 | return xopen(pathname, O_RDONLY | O_NONBLOCK); |
| 173 | } |
| 174 | |
| 175 | int FAST_FUNC xopen_as_uid_gid(const char *pathname, int flags, uid_t u, gid_t g) |
| 176 | { |
| 177 | int fd; |
| 178 | uid_t old_euid = geteuid(); |
| 179 | gid_t old_egid = getegid(); |
| 180 | |
| 181 | xsetegid(g); |
| 182 | xseteuid(u); |
| 183 | |
| 184 | fd = xopen(pathname, flags); |
| 185 | |
| 186 | xseteuid(old_euid); |
| 187 | xsetegid(old_egid); |
| 188 | |
| 189 | return fd; |
| 190 | } |
| 191 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 192 | void FAST_FUNC xunlink(const char *pathname) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 193 | { |
| 194 | if (unlink(pathname)) |
| 195 | bb_perror_msg_and_die("can't remove file '%s'", pathname); |
| 196 | } |
| 197 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 198 | void FAST_FUNC xrename(const char *oldpath, const char *newpath) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 199 | { |
| 200 | if (rename(oldpath, newpath)) |
| 201 | bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath); |
| 202 | } |
| 203 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 204 | int FAST_FUNC rename_or_warn(const char *oldpath, const char *newpath) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 205 | { |
| 206 | int n = rename(oldpath, newpath); |
| 207 | if (n) |
| 208 | bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath); |
| 209 | return n; |
| 210 | } |
| 211 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 212 | void FAST_FUNC xpipe(int filedes[2]) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 213 | { |
| 214 | if (pipe(filedes)) |
| 215 | bb_perror_msg_and_die("can't create pipe"); |
| 216 | } |
| 217 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 218 | void FAST_FUNC xdup2(int from, int to) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 219 | { |
| 220 | if (dup2(from, to) != to) |
| 221 | bb_perror_msg_and_die("can't duplicate file descriptor"); |
| 222 | } |
| 223 | |
| 224 | // "Renumber" opened fd |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 225 | void FAST_FUNC xmove_fd(int from, int to) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 226 | { |
| 227 | if (from == to) |
| 228 | return; |
| 229 | xdup2(from, to); |
| 230 | close(from); |
| 231 | } |
| 232 | |
| 233 | // Die with an error message if we can't write the entire buffer. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 234 | void FAST_FUNC xwrite(int fd, const void *buf, size_t count) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 235 | { |
| 236 | if (count) { |
| 237 | ssize_t size = full_write(fd, buf, count); |
Denys Vlasenko | 9fd61be | 2016-09-05 15:20:10 +0200 | [diff] [blame] | 238 | if ((size_t)size != count) { |
| 239 | /* |
| 240 | * Two cases: write error immediately; |
| 241 | * or some writes succeeded, then we hit an error. |
| 242 | * In either case, errno is set. |
| 243 | */ |
| 244 | bb_perror_msg_and_die( |
| 245 | size >= 0 ? "short write" : "write error" |
| 246 | ); |
| 247 | } |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 248 | } |
| 249 | } |
Denis Vlasenko | 73c571a | 2009-03-09 00:12:37 +0000 | [diff] [blame] | 250 | void FAST_FUNC xwrite_str(int fd, const char *str) |
| 251 | { |
| 252 | xwrite(fd, str, strlen(str)); |
| 253 | } |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 254 | |
Denys Vlasenko | dcd27ab | 2009-10-05 03:03:07 +0200 | [diff] [blame] | 255 | void FAST_FUNC xclose(int fd) |
| 256 | { |
| 257 | if (close(fd)) |
| 258 | bb_perror_msg_and_die("close failed"); |
| 259 | } |
| 260 | |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 261 | // Die with an error message if we can't lseek to the right spot. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 262 | off_t FAST_FUNC xlseek(int fd, off_t offset, int whence) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 263 | { |
| 264 | off_t off = lseek(fd, offset, whence); |
| 265 | if (off == (off_t)-1) { |
| 266 | if (whence == SEEK_SET) |
| 267 | bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset); |
| 268 | bb_perror_msg_and_die("lseek"); |
| 269 | } |
| 270 | return off; |
| 271 | } |
| 272 | |
Alexander Shishkin | 6722737 | 2010-10-22 13:27:16 +0200 | [diff] [blame] | 273 | int FAST_FUNC xmkstemp(char *template) |
| 274 | { |
| 275 | int fd = mkstemp(template); |
| 276 | if (fd < 0) |
| 277 | bb_perror_msg_and_die("can't create temp file '%s'", template); |
| 278 | return fd; |
| 279 | } |
| 280 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 281 | // Die with supplied filename if this FILE* has ferror set. |
| 282 | void FAST_FUNC die_if_ferror(FILE *fp, const char *fn) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 283 | { |
| 284 | if (ferror(fp)) { |
| 285 | /* ferror doesn't set useful errno */ |
| 286 | bb_error_msg_and_die("%s: I/O error", fn); |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | // Die with an error message if stdout has ferror set. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 291 | void FAST_FUNC die_if_ferror_stdout(void) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 292 | { |
| 293 | die_if_ferror(stdout, bb_msg_standard_output); |
| 294 | } |
| 295 | |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 296 | int FAST_FUNC fflush_all(void) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 297 | { |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 298 | return fflush(NULL); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 302 | int FAST_FUNC bb_putchar(int ch) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 303 | { |
Denys Vlasenko | c066472 | 2010-01-02 18:49:22 +0100 | [diff] [blame] | 304 | return putchar(ch); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 305 | } |
| 306 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 307 | /* Die with an error message if we can't copy an entire FILE* to stdout, |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 308 | * then close that file. */ |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 309 | void FAST_FUNC xprint_and_close_file(FILE *file) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 310 | { |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 311 | fflush_all(); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 312 | // copyfd outputs error messages for us. |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 313 | if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 314 | xfunc_die(); |
| 315 | |
| 316 | fclose(file); |
| 317 | } |
| 318 | |
| 319 | // Die with an error message if we can't malloc() enough space and do an |
| 320 | // sprintf() into that space. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 321 | char* FAST_FUNC xasprintf(const char *format, ...) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 322 | { |
| 323 | va_list p; |
| 324 | int r; |
| 325 | char *string_ptr; |
| 326 | |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 327 | va_start(p, format); |
| 328 | r = vasprintf(&string_ptr, format, p); |
| 329 | va_end(p); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 330 | |
| 331 | if (r < 0) |
| 332 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 333 | return string_ptr; |
| 334 | } |
| 335 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 336 | void FAST_FUNC xsetenv(const char *key, const char *value) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 337 | { |
| 338 | if (setenv(key, value, 1)) |
| 339 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 340 | } |
| 341 | |
Denis Vlasenko | 76ddc2e | 2008-12-30 05:05:31 +0000 | [diff] [blame] | 342 | /* Handles "VAR=VAL" strings, even those which are part of environ |
| 343 | * _right now_ |
| 344 | */ |
| 345 | void FAST_FUNC bb_unsetenv(const char *var) |
| 346 | { |
Denys Vlasenko | ef0366e | 2017-07-22 02:15:17 +0200 | [diff] [blame] | 347 | char onstack[128 - 16]; /* smaller stack setup code on x86 */ |
| 348 | char *tp; |
Denis Vlasenko | 76ddc2e | 2008-12-30 05:05:31 +0000 | [diff] [blame] | 349 | |
Denys Vlasenko | ef0366e | 2017-07-22 02:15:17 +0200 | [diff] [blame] | 350 | tp = strchr(var, '='); |
| 351 | if (tp) { |
| 352 | /* In case var was putenv'ed, we can't replace '=' |
| 353 | * with NUL and unsetenv(var) - it won't work, |
| 354 | * env is modified by the replacement, unsetenv |
| 355 | * sees "VAR" instead of "VAR=VAL" and does not remove it! |
| 356 | * Horror :( |
| 357 | */ |
| 358 | unsigned sz = tp - var; |
| 359 | if (sz < sizeof(onstack)) { |
| 360 | ((char*)mempcpy(onstack, var, sz))[0] = '\0'; |
| 361 | tp = NULL; |
| 362 | var = onstack; |
| 363 | } else { |
| 364 | /* unlikely: very long var name */ |
| 365 | var = tp = xstrndup(var, sz); |
| 366 | } |
Denis Vlasenko | 76ddc2e | 2008-12-30 05:05:31 +0000 | [diff] [blame] | 367 | } |
Denys Vlasenko | ef0366e | 2017-07-22 02:15:17 +0200 | [diff] [blame] | 368 | unsetenv(var); |
Denis Vlasenko | 76ddc2e | 2008-12-30 05:05:31 +0000 | [diff] [blame] | 369 | free(tp); |
| 370 | } |
| 371 | |
Denys Vlasenko | dd8adde | 2010-06-24 05:00:50 +0200 | [diff] [blame] | 372 | void FAST_FUNC bb_unsetenv_and_free(char *var) |
| 373 | { |
| 374 | bb_unsetenv(var); |
| 375 | free(var); |
| 376 | } |
Denis Vlasenko | 76ddc2e | 2008-12-30 05:05:31 +0000 | [diff] [blame] | 377 | |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 378 | // Die with an error message if we can't set gid. (Because resource limits may |
| 379 | // limit this user to a given number of processes, and if that fills up the |
| 380 | // setgid() will fail and we'll _still_be_root_, which is bad.) |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 381 | void FAST_FUNC xsetgid(gid_t gid) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 382 | { |
| 383 | if (setgid(gid)) bb_perror_msg_and_die("setgid"); |
| 384 | } |
| 385 | |
| 386 | // Die with an error message if we can't set uid. (See xsetgid() for why.) |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 387 | void FAST_FUNC xsetuid(uid_t uid) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 388 | { |
| 389 | if (setuid(uid)) bb_perror_msg_and_die("setuid"); |
| 390 | } |
| 391 | |
Ryan Mallon | 5906a5c | 2013-10-08 14:52:49 +0200 | [diff] [blame] | 392 | void FAST_FUNC xsetegid(gid_t egid) |
| 393 | { |
| 394 | if (setegid(egid)) bb_perror_msg_and_die("setegid"); |
| 395 | } |
| 396 | |
| 397 | void FAST_FUNC xseteuid(uid_t euid) |
| 398 | { |
| 399 | if (seteuid(euid)) bb_perror_msg_and_die("seteuid"); |
| 400 | } |
| 401 | |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 402 | // Die if we can't chdir to a new path. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 403 | void FAST_FUNC xchdir(const char *path) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 404 | { |
| 405 | if (chdir(path)) |
Pascal Bellard | 70fc8c1 | 2012-06-12 13:21:02 +0200 | [diff] [blame] | 406 | bb_perror_msg_and_die("can't change directory to '%s'", path); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 407 | } |
| 408 | |
Denys Vlasenko | c4199f2 | 2016-04-01 22:12:44 +0200 | [diff] [blame] | 409 | void FAST_FUNC xfchdir(int fd) |
| 410 | { |
| 411 | if (fchdir(fd)) |
| 412 | bb_perror_msg_and_die("fchdir"); |
| 413 | } |
| 414 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 415 | void FAST_FUNC xchroot(const char *path) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 416 | { |
| 417 | if (chroot(path)) |
Pascal Bellard | 70fc8c1 | 2012-06-12 13:21:02 +0200 | [diff] [blame] | 418 | bb_perror_msg_and_die("can't change root directory to '%s'", path); |
Denys Vlasenko | 0687a5b | 2012-03-08 00:28:24 +0100 | [diff] [blame] | 419 | xchdir("/"); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | // Print a warning message if opendir() fails, but don't die. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 423 | DIR* FAST_FUNC warn_opendir(const char *path) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 424 | { |
| 425 | DIR *dp; |
| 426 | |
| 427 | dp = opendir(path); |
| 428 | if (!dp) |
| 429 | bb_perror_msg("can't open '%s'", path); |
| 430 | return dp; |
| 431 | } |
| 432 | |
| 433 | // Die with an error message if opendir() fails. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 434 | DIR* FAST_FUNC xopendir(const char *path) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 435 | { |
| 436 | DIR *dp; |
| 437 | |
| 438 | dp = opendir(path); |
| 439 | if (!dp) |
| 440 | bb_perror_msg_and_die("can't open '%s'", path); |
| 441 | return dp; |
| 442 | } |
| 443 | |
| 444 | // Die with an error message if we can't open a new socket. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 445 | int FAST_FUNC xsocket(int domain, int type, int protocol) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 446 | { |
| 447 | int r = socket(domain, type, protocol); |
| 448 | |
| 449 | if (r < 0) { |
| 450 | /* Hijack vaguely related config option */ |
| 451 | #if ENABLE_VERBOSE_RESOLUTION_ERRORS |
| 452 | const char *s = "INET"; |
Jeremie Koenig | 2988511 | 2010-05-27 15:39:24 +0200 | [diff] [blame] | 453 | # ifdef AF_PACKET |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 454 | if (domain == AF_PACKET) s = "PACKET"; |
Jeremie Koenig | 2988511 | 2010-05-27 15:39:24 +0200 | [diff] [blame] | 455 | # endif |
| 456 | # ifdef AF_NETLINK |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 457 | if (domain == AF_NETLINK) s = "NETLINK"; |
Jeremie Koenig | 2988511 | 2010-05-27 15:39:24 +0200 | [diff] [blame] | 458 | # endif |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 459 | IF_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";) |
Denys Vlasenko | b2e5fc3 | 2009-11-25 14:52:47 +0100 | [diff] [blame] | 460 | bb_perror_msg_and_die("socket(AF_%s,%d,%d)", s, type, protocol); |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 461 | #else |
| 462 | bb_perror_msg_and_die("socket"); |
| 463 | #endif |
| 464 | } |
| 465 | |
| 466 | return r; |
| 467 | } |
| 468 | |
| 469 | // Die with an error message if we can't bind a socket to an address. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 470 | void FAST_FUNC xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 471 | { |
| 472 | if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind"); |
| 473 | } |
| 474 | |
| 475 | // Die with an error message if we can't listen for connections on a socket. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 476 | void FAST_FUNC xlisten(int s, int backlog) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 477 | { |
| 478 | if (listen(s, backlog)) bb_perror_msg_and_die("listen"); |
| 479 | } |
| 480 | |
| 481 | /* Die with an error message if sendto failed. |
| 482 | * Return bytes sent otherwise */ |
Denis Vlasenko | fa65a3d | 2009-01-24 20:11:36 +0000 | [diff] [blame] | 483 | ssize_t FAST_FUNC xsendto(int s, const void *buf, size_t len, const struct sockaddr *to, |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 484 | socklen_t tolen) |
| 485 | { |
| 486 | ssize_t ret = sendto(s, buf, len, 0, to, tolen); |
| 487 | if (ret < 0) { |
| 488 | if (ENABLE_FEATURE_CLEAN_UP) |
| 489 | close(s); |
| 490 | bb_perror_msg_and_die("sendto"); |
| 491 | } |
| 492 | return ret; |
| 493 | } |
| 494 | |
| 495 | // xstat() - a stat() which dies on failure with meaningful error message |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 496 | void FAST_FUNC xstat(const char *name, struct stat *stat_buf) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 497 | { |
| 498 | if (stat(name, stat_buf)) |
| 499 | bb_perror_msg_and_die("can't stat '%s'", name); |
| 500 | } |
| 501 | |
Denys Vlasenko | 8d3e225 | 2010-08-31 12:42:06 +0200 | [diff] [blame] | 502 | void FAST_FUNC xfstat(int fd, struct stat *stat_buf, const char *errmsg) |
| 503 | { |
| 504 | /* errmsg is usually a file name, but not always: |
| 505 | * xfstat may be called in a spot where file name is no longer |
| 506 | * available, and caller may give e.g. "can't stat input file" string. |
| 507 | */ |
| 508 | if (fstat(fd, stat_buf)) |
| 509 | bb_simple_perror_msg_and_die(errmsg); |
| 510 | } |
| 511 | |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 512 | // selinux_or_die() - die if SELinux is disabled. |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 513 | void FAST_FUNC selinux_or_die(void) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 514 | { |
| 515 | #if ENABLE_SELINUX |
| 516 | int rc = is_selinux_enabled(); |
| 517 | if (rc == 0) { |
| 518 | bb_error_msg_and_die("SELinux is disabled"); |
| 519 | } else if (rc < 0) { |
| 520 | bb_error_msg_and_die("is_selinux_enabled() failed"); |
| 521 | } |
| 522 | #else |
| 523 | bb_error_msg_and_die("SELinux support is disabled"); |
| 524 | #endif |
| 525 | } |
| 526 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 527 | int FAST_FUNC ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 528 | { |
| 529 | int ret; |
| 530 | va_list p; |
| 531 | |
| 532 | ret = ioctl(fd, request, argp); |
| 533 | if (ret < 0) { |
| 534 | va_start(p, fmt); |
| 535 | bb_verror_msg(fmt, p, strerror(errno)); |
| 536 | /* xfunc_die can actually longjmp, so be nice */ |
| 537 | va_end(p); |
| 538 | xfunc_die(); |
| 539 | } |
| 540 | return ret; |
| 541 | } |
| 542 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 543 | int FAST_FUNC ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 544 | { |
| 545 | va_list p; |
| 546 | int ret = ioctl(fd, request, argp); |
| 547 | |
| 548 | if (ret < 0) { |
| 549 | va_start(p, fmt); |
| 550 | bb_verror_msg(fmt, p, strerror(errno)); |
| 551 | va_end(p); |
| 552 | } |
| 553 | return ret; |
| 554 | } |
| 555 | |
| 556 | #if ENABLE_IOCTL_HEX2STR_ERROR |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 557 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 558 | { |
| 559 | int ret; |
| 560 | |
| 561 | ret = ioctl(fd, request, argp); |
| 562 | if (ret < 0) |
| 563 | bb_simple_perror_msg(ioctl_name); |
| 564 | return ret; |
| 565 | } |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 566 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 567 | { |
| 568 | int ret; |
| 569 | |
| 570 | ret = ioctl(fd, request, argp); |
| 571 | if (ret < 0) |
| 572 | bb_simple_perror_msg_and_die(ioctl_name); |
| 573 | return ret; |
| 574 | } |
| 575 | #else |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 576 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 577 | { |
| 578 | int ret; |
| 579 | |
| 580 | ret = ioctl(fd, request, argp); |
| 581 | if (ret < 0) |
| 582 | bb_perror_msg("ioctl %#x failed", request); |
| 583 | return ret; |
| 584 | } |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 585 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp) |
Denis Vlasenko | 858ebf1 | 2008-04-09 00:33:53 +0000 | [diff] [blame] | 586 | { |
| 587 | int ret; |
| 588 | |
| 589 | ret = ioctl(fd, request, argp); |
| 590 | if (ret < 0) |
| 591 | bb_perror_msg_and_die("ioctl %#x failed", request); |
| 592 | return ret; |
| 593 | } |
| 594 | #endif |
Denys Vlasenko | 19ced5c | 2010-06-06 21:53:09 +0200 | [diff] [blame] | 595 | |
| 596 | char* FAST_FUNC xmalloc_ttyname(int fd) |
| 597 | { |
Denys Vlasenko | 543efd7 | 2013-08-06 00:41:06 +0200 | [diff] [blame] | 598 | char buf[128]; |
| 599 | int r = ttyname_r(fd, buf, sizeof(buf) - 1); |
| 600 | if (r) |
| 601 | return NULL; |
| 602 | return xstrdup(buf); |
Denys Vlasenko | 19ced5c | 2010-06-06 21:53:09 +0200 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | void FAST_FUNC generate_uuid(uint8_t *buf) |
| 606 | { |
| 607 | /* http://www.ietf.org/rfc/rfc4122.txt |
| 608 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| 609 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 610 | * | time_low | |
| 611 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 612 | * | time_mid | time_hi_and_version | |
| 613 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 614 | * |clk_seq_and_variant | node (0-1) | |
| 615 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 616 | * | node (2-5) | |
| 617 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 618 | * IOW, uuid has this layout: |
| 619 | * uint32_t time_low (big endian) |
| 620 | * uint16_t time_mid (big endian) |
| 621 | * uint16_t time_hi_and_version (big endian) |
| 622 | * version is a 4-bit field: |
| 623 | * 1 Time-based |
| 624 | * 2 DCE Security, with embedded POSIX UIDs |
| 625 | * 3 Name-based (MD5) |
| 626 | * 4 Randomly generated |
| 627 | * 5 Name-based (SHA-1) |
| 628 | * uint16_t clk_seq_and_variant (big endian) |
| 629 | * variant is a 3-bit field: |
| 630 | * 0xx Reserved, NCS backward compatibility |
| 631 | * 10x The variant specified in rfc4122 |
| 632 | * 110 Reserved, Microsoft backward compatibility |
| 633 | * 111 Reserved for future definition |
| 634 | * uint8_t node[6] |
| 635 | * |
| 636 | * For version 4, these bits are set/cleared: |
| 637 | * time_hi_and_version & 0x0fff | 0x4000 |
| 638 | * clk_seq_and_variant & 0x3fff | 0x8000 |
| 639 | */ |
| 640 | pid_t pid; |
| 641 | int i; |
| 642 | |
| 643 | i = open("/dev/urandom", O_RDONLY); |
| 644 | if (i >= 0) { |
| 645 | read(i, buf, 16); |
| 646 | close(i); |
| 647 | } |
| 648 | /* Paranoia. /dev/urandom may be missing. |
| 649 | * rand() is guaranteed to generate at least [0, 2^15) range, |
| 650 | * but lowest bits in some libc are not so "random". */ |
| 651 | srand(monotonic_us()); /* pulls in printf */ |
| 652 | pid = getpid(); |
| 653 | while (1) { |
| 654 | for (i = 0; i < 16; i++) |
| 655 | buf[i] ^= rand() >> 5; |
| 656 | if (pid == 0) |
| 657 | break; |
| 658 | srand(pid); |
| 659 | pid = 0; |
| 660 | } |
| 661 | |
| 662 | /* version = 4 */ |
| 663 | buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40; |
| 664 | /* variant = 10x */ |
| 665 | buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80; |
| 666 | } |
Pascal Bellard | 926031b | 2010-07-04 15:32:38 +0200 | [diff] [blame] | 667 | |
| 668 | #if BB_MMU |
| 669 | pid_t FAST_FUNC xfork(void) |
| 670 | { |
| 671 | pid_t pid; |
| 672 | pid = fork(); |
| 673 | if (pid < 0) /* wtf? */ |
| 674 | bb_perror_msg_and_die("vfork"+1); |
| 675 | return pid; |
| 676 | } |
| 677 | #endif |
Denys Vlasenko | 8220399 | 2016-04-02 18:06:24 +0200 | [diff] [blame] | 678 | |
| 679 | void FAST_FUNC xvfork_parent_waits_and_exits(void) |
| 680 | { |
| 681 | pid_t pid; |
| 682 | |
| 683 | fflush_all(); |
| 684 | pid = xvfork(); |
| 685 | if (pid > 0) { |
| 686 | /* Parent */ |
| 687 | int exit_status = wait_for_exitstatus(pid); |
| 688 | if (WIFSIGNALED(exit_status)) |
| 689 | kill_myself_with_sig(WTERMSIG(exit_status)); |
| 690 | _exit(WEXITSTATUS(exit_status)); |
| 691 | } |
| 692 | /* Child continues */ |
| 693 | } |