Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/userspec.c @ 3050:aaaab011fac4
This bug had a serious impact on chown: `chown N:M FILE' (for integer
N and M) would have treated it like `chown N:N FILE'.
(parse_user_spec): Fix typo: s/u/g/.
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sat, 16 Dec 2000 13:28:13 +0000 |
| parents | 2dbeeb57e042 |
| children | 48781102544a |
| rev | line source |
|---|---|
| 5 | 1 /* userspec.c -- Parse a user and group string. |
| 2271 | 2 Copyright (C) 1989-1992, 1997, 1998, 2000 Free Software Foundation, Inc. |
| 5 | 3 |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
|
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15 along with this program; if not, write to the Free Software Foundation, |
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 5 | 17 |
| 18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
| 966 | 19 |
| 20 #if HAVE_CONFIG_H | |
| 21 # include <config.h> | |
| 105 | 22 #endif |
| 23 | |
| 231 | 24 #ifdef __GNUC__ |
|
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25 # define alloca __builtin_alloca |
| 231 | 26 #else |
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27 # if HAVE_ALLOCA_H |
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28 # include <alloca.h> |
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29 # else |
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30 # ifdef _AIX |
| 966 | 31 # pragma alloca |
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32 # else |
| 231 | 33 char *alloca (); |
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34 # endif |
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35 # endif |
| 231 | 36 #endif |
| 230 | 37 |
| 5 | 38 #include <stdio.h> |
| 39 #include <sys/types.h> | |
| 40 #include <pwd.h> | |
| 41 #include <grp.h> | |
| 42 | |
| 2854 | 43 #if HAVE_SYS_PARAM_H |
| 44 # include <sys/param.h> | |
| 45 #endif | |
| 46 | |
| 47 #if HAVE_LIMITS_H | |
| 48 # include <limits.h> | |
| 49 #endif | |
| 50 | |
| 966 | 51 #if HAVE_STRING_H |
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52 # include <string.h> |
| 5 | 53 #else |
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54 # include <strings.h> |
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55 # ifndef strchr |
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56 # define strchr index |
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57 # endif |
| 5 | 58 #endif |
| 59 | |
| 966 | 60 #if STDC_HEADERS |
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61 # include <stdlib.h> |
| 5 | 62 #endif |
| 63 | |
| 966 | 64 #if HAVE_UNISTD_H |
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65 # include <unistd.h> |
| 5 | 66 #endif |
| 67 | |
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68 #include "xalloc.h" |
| 2854 | 69 #include "xstrtol.h" |
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70 |
| 2273 | 71 #if ENABLE_NLS |
| 72 # include <libintl.h> | |
| 73 # define _(Text) gettext (Text) | |
| 74 #else | |
| 75 # define _(Text) Text | |
| 76 #endif | |
| 77 #define N_(Text) Text | |
| 78 | |
| 5 | 79 #ifndef _POSIX_VERSION |
| 80 struct passwd *getpwnam (); | |
| 81 struct group *getgrnam (); | |
| 82 struct group *getgrgid (); | |
| 83 #endif | |
| 84 | |
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85 #ifndef HAVE_ENDGRENT |
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86 # define endgrent() ((void) 0) |
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87 #endif |
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88 |
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89 #ifndef HAVE_ENDPWENT |
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90 # define endpwent() ((void) 0) |
| 5 | 91 #endif |
| 92 | |
| 2854 | 93 #ifndef CHAR_BIT |
| 94 # define CHAR_BIT 8 | |
| 95 #endif | |
| 96 | |
| 97 /* The extra casts work around common compiler bugs. */ | |
| 98 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) | |
| 99 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0. | |
| 100 It is necessary at least when t == time_t. */ | |
| 101 #define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \ | |
| 102 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0)) | |
| 103 #define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t))) | |
| 104 | |
| 105 #ifndef UID_T_MAX | |
| 106 # define UID_T_MAX TYPE_MAXIMUM (uid_t) | |
| 107 #endif | |
| 108 | |
| 109 #ifndef GID_T_MAX | |
| 110 # define GID_T_MAX TYPE_MAXIMUM (gid_t) | |
| 111 #endif | |
| 112 | |
| 113 /* MAXUID may come from limits.h or sys/params.h. */ | |
| 114 #ifndef MAXUID | |
| 115 # define MAXUID UID_T_MAX | |
| 116 #endif | |
| 117 #ifndef MAXGID | |
| 118 # define MAXGID GID_T_MAX | |
| 119 #endif | |
| 120 | |
| 230 | 121 /* Perform the equivalent of the statement `dest = strdup (src);', |
| 122 but obtaining storage via alloca instead of from the heap. */ | |
| 123 | |
| 124 #define V_STRDUP(dest, src) \ | |
| 125 do \ | |
| 126 { \ | |
| 127 int _len = strlen ((src)); \ | |
| 128 (dest) = (char *) alloca (_len + 1); \ | |
| 129 strcpy (dest, src); \ | |
| 130 } \ | |
| 131 while (0) | |
| 132 | |
| 2271 | 133 /* ISDIGIT differs from isdigit, as follows: |
| 134 - Its arg may be any int or unsigned int; it need not be an unsigned char. | |
| 135 - It's guaranteed to evaluate its argument exactly once. | |
| 136 - It's typically faster. | |
| 137 Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that | |
| 138 only '0' through '9' are digits. Prefer ISDIGIT to isdigit unless | |
| 139 it's important to use the locale's definition of `digit' even when the | |
| 140 host does not conform to Posix. */ | |
| 141 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) | |
| 5 | 142 |
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143 #ifndef strdup |
| 5 | 144 char *strdup (); |
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145 #endif |
| 194 | 146 |
| 147 /* Return nonzero if STR represents an unsigned decimal integer, | |
| 148 otherwise return 0. */ | |
| 149 | |
| 150 static int | |
| 1557 | 151 is_number (const char *str) |
| 194 | 152 { |
| 153 for (; *str; str++) | |
| 2271 | 154 if (!ISDIGIT (*str)) |
| 194 | 155 return 0; |
| 156 return 1; | |
| 157 } | |
| 5 | 158 |
| 159 /* Extract from NAME, which has the form "[user][:.][group]", | |
| 160 a USERNAME, UID U, GROUPNAME, and GID G. | |
| 161 Either user or group, or both, must be present. | |
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162 If the group is omitted but the ":" separator is given, |
| 5 | 163 use the given user's login group. |
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164 If SPEC_ARG contains a `:', then use that as the separator, ignoring |
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165 any `.'s. If there is no `:', but there is a `.', then first look |
| 3049 | 166 up the entire SPEC_ARG as a login name. If that look-up fails, then |
| 167 try again interpreting the `.' as a separator. | |
| 5 | 168 |
| 169 USERNAME and GROUPNAME will be in newly malloc'd memory. | |
| 170 Either one might be NULL instead, indicating that it was not | |
| 171 given and the corresponding numeric ID was left unchanged. | |
| 172 | |
| 173 Return NULL if successful, a static error message string if not. */ | |
| 174 | |
| 194 | 175 const char * |
| 1580 | 176 parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid, |
| 177 char **username_arg, char **groupname_arg) | |
| 5 | 178 { |
| 2273 | 179 static const char *E_invalid_user = N_("invalid user"); |
| 180 static const char *E_invalid_group = N_("invalid group"); | |
| 181 static const char *E_bad_spec = | |
| 182 N_("cannot get the login group of a numeric UID"); | |
| 183 static const char *E_cannot_omit_both = | |
| 184 N_("cannot omit both user and group"); | |
| 185 | |
| 194 | 186 const char *error_msg; |
| 187 char *spec; /* A copy we can write on. */ | |
| 5 | 188 struct passwd *pwd; |
| 189 struct group *grp; | |
| 194 | 190 char *g, *u, *separator; |
| 230 | 191 char *groupname; |
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192 int maybe_retry = 0; |
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193 char *dot = NULL; |
| 5 | 194 |
| 194 | 195 error_msg = NULL; |
| 230 | 196 *username_arg = *groupname_arg = NULL; |
| 197 groupname = NULL; | |
| 5 | 198 |
| 231 | 199 V_STRDUP (spec, spec_arg); |
| 194 | 200 |
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201 /* Find the POSIX `:' separator if there is one. */ |
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202 separator = strchr (spec, ':'); |
| 2273 | 203 |
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204 /* If there is no colon, then see if there's a `.'. */ |
| 194 | 205 if (separator == NULL) |
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206 { |
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207 dot = strchr (spec, '.'); |
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208 /* If there's no colon but there is a `.', then first look up the |
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209 whole spec, in case it's an OWNER name that includes a dot. |
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210 If that fails, then we'll try again, but interpreting the `.' |
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211 as a separator. */ |
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212 /* FIXME: accepting `.' as the separator is contrary to POSIX. |
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213 someday we should drop support for this. */ |
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214 if (dot) |
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215 maybe_retry = 1; |
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216 } |
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217 |
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218 retry: |
| 194 | 219 |
| 220 /* Replace separator with a NUL. */ | |
| 221 if (separator != NULL) | |
| 222 *separator = '\0'; | |
| 223 | |
| 224 /* Set U and G to non-zero length strings corresponding to user and | |
| 225 group specifiers or to NULL. */ | |
| 226 u = (*spec == '\0' ? NULL : spec); | |
| 227 | |
| 228 g = (separator == NULL || *(separator + 1) == '\0' | |
| 229 ? NULL | |
| 230 : separator + 1); | |
| 231 | |
| 232 if (u == NULL && g == NULL) | |
| 2273 | 233 return _(E_cannot_omit_both); |
| 194 | 234 |
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235 #ifdef __DJGPP__ |
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236 /* Pretend that we are the user U whose group is G. This makes |
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237 pwd and grp functions ``know'' about the UID and GID of these. */ |
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238 if (u && !is_number (u)) |
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239 setenv ("USER", u, 1); |
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240 if (g && !is_number (g)) |
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241 setenv ("GROUP", g, 1); |
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242 #endif |
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243 |
| 194 | 244 if (u != NULL) |
| 5 | 245 { |
| 194 | 246 pwd = getpwnam (u); |
| 247 if (pwd == NULL) | |
| 5 | 248 { |
| 194 | 249 |
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250 if (!is_number (u)) |
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251 error_msg = E_invalid_user; |
| 5 | 252 else |
| 194 | 253 { |
| 254 int use_login_group; | |
| 255 use_login_group = (separator != NULL && g == NULL); | |
| 256 if (use_login_group) | |
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257 error_msg = E_bad_spec; |
| 194 | 258 else |
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259 { |
| 2854 | 260 unsigned long int tmp_long; |
| 261 if (xstrtoul (u, NULL, 0, &tmp_long, NULL) != LONGINT_OK | |
| 262 || tmp_long > MAXUID) | |
| 263 return _(E_invalid_user); | |
| 264 *uid = tmp_long; | |
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265 } |
| 194 | 266 } |
| 5 | 267 } |
| 268 else | |
| 269 { | |
| 194 | 270 *uid = pwd->pw_uid; |
| 271 if (g == NULL && separator != NULL) | |
| 5 | 272 { |
| 194 | 273 /* A separator was given, but a group was not specified, |
| 274 so get the login group. */ | |
| 275 *gid = pwd->pw_gid; | |
| 276 grp = getgrgid (pwd->pw_gid); | |
| 277 if (grp == NULL) | |
| 278 { | |
| 279 /* This is enough room to hold the unsigned decimal | |
| 280 representation of any 32-bit quantity and the trailing | |
| 281 zero byte. */ | |
| 282 char uint_buf[21]; | |
| 283 sprintf (uint_buf, "%u", (unsigned) (pwd->pw_gid)); | |
| 230 | 284 V_STRDUP (groupname, uint_buf); |
| 194 | 285 } |
| 286 else | |
| 287 { | |
| 230 | 288 V_STRDUP (groupname, grp->gr_name); |
| 194 | 289 } |
| 290 endgrent (); | |
| 5 | 291 } |
| 194 | 292 } |
| 293 endpwent (); | |
| 5 | 294 } |
| 295 | |
| 195 | 296 if (g != NULL && error_msg == NULL) |
| 194 | 297 { |
| 298 /* Explicit group. */ | |
| 299 grp = getgrnam (g); | |
| 300 if (grp == NULL) | |
| 301 { | |
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302 if (!is_number (g)) |
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303 error_msg = E_invalid_group; |
| 194 | 304 else |
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305 { |
| 2854 | 306 unsigned long int tmp_long; |
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307 if (xstrtoul (g, NULL, 0, &tmp_long, NULL) != LONGINT_OK |
| 2854 | 308 || tmp_long > MAXGID) |
| 309 return _(E_invalid_group); | |
| 310 *gid = tmp_long; | |
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311 } |
| 194 | 312 } |
| 313 else | |
| 314 *gid = grp->gr_gid; | |
| 315 endgrent (); /* Save a file descriptor. */ | |
| 5 | 316 |
| 194 | 317 if (error_msg == NULL) |
| 230 | 318 V_STRDUP (groupname, g); |
| 5 | 319 } |
| 194 | 320 |
| 230 | 321 if (error_msg == NULL) |
| 5 | 322 { |
| 230 | 323 if (u != NULL) |
| 324 { | |
| 325 *username_arg = strdup (u); | |
| 326 if (*username_arg == NULL) | |
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327 error_msg = xalloc_msg_memory_exhausted; |
| 230 | 328 } |
| 329 | |
| 330 if (groupname != NULL && error_msg == NULL) | |
| 5 | 331 { |
| 230 | 332 *groupname_arg = strdup (groupname); |
| 333 if (*groupname_arg == NULL) | |
| 334 { | |
| 335 if (*username_arg != NULL) | |
| 336 { | |
| 337 free (*username_arg); | |
| 338 *username_arg = NULL; | |
| 339 } | |
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340 error_msg = xalloc_msg_memory_exhausted; |
| 230 | 341 } |
| 5 | 342 } |
| 343 } | |
| 194 | 344 |
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345 if (error_msg && maybe_retry) |
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346 { |
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347 maybe_retry = 0; |
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348 separator = dot; |
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349 error_msg = NULL; |
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350 goto retry; |
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351 } |
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352 |
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353 return _(error_msg); |
| 5 | 354 } |
| 355 | |
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356 #ifdef TEST |
| 194 | 357 |
| 966 | 358 # define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) |
| 194 | 359 |
| 360 int | |
| 361 main (int argc, char **argv) | |
| 362 { | |
| 363 int i; | |
| 364 | |
| 365 for (i = 1; i < argc; i++) | |
| 366 { | |
| 367 const char *e; | |
| 368 char *username, *groupname; | |
| 369 uid_t uid; | |
| 370 gid_t gid; | |
| 371 char *tmp; | |
| 5 | 372 |
| 194 | 373 tmp = strdup (argv[i]); |
| 374 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 375 free (tmp); | |
| 376 printf ("%s: %u %u %s %s %s\n", | |
| 377 argv[i], | |
| 378 (unsigned int) uid, | |
| 379 (unsigned int) gid, | |
| 380 NULL_CHECK (username), | |
| 381 NULL_CHECK (groupname), | |
| 382 NULL_CHECK (e)); | |
| 383 } | |
| 384 | |
| 385 exit (0); | |
| 5 | 386 } |
| 194 | 387 |
| 388 #endif |