Mercurial > hg > octave-lojdl > gnulib-hg
annotate lib/userspec.c @ 4156:99ea86c79f44
Make it possibly to simply write: #include <alloca.h>.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Fri, 10 Jan 2003 21:06:49 +0000 |
| parents | 22d3032f0239 |
| children | fcd34d3861a4 |
| rev | line source |
|---|---|
| 5 | 1 /* userspec.c -- Parse a user and group string. |
|
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2 Copyright (C) 1989-1992, 1997-1998, 2000, 2002-2003 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 | |
|
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24 #include <alloca.h> |
| 230 | 25 |
| 5 | 26 #include <stdio.h> |
| 27 #include <sys/types.h> | |
| 28 #include <pwd.h> | |
| 29 #include <grp.h> | |
| 30 | |
| 2854 | 31 #if HAVE_SYS_PARAM_H |
| 32 # include <sys/param.h> | |
| 33 #endif | |
| 34 | |
| 35 #if HAVE_LIMITS_H | |
| 36 # include <limits.h> | |
| 37 #endif | |
| 38 | |
| 966 | 39 #if HAVE_STRING_H |
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40 # include <string.h> |
| 5 | 41 #else |
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42 # include <strings.h> |
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43 # ifndef strchr |
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44 # define strchr index |
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45 # endif |
| 5 | 46 #endif |
| 47 | |
| 966 | 48 #if STDC_HEADERS |
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49 # include <stdlib.h> |
| 5 | 50 #endif |
| 51 | |
| 966 | 52 #if HAVE_UNISTD_H |
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53 # include <unistd.h> |
| 5 | 54 #endif |
| 55 | |
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56 #include "xalloc.h" |
| 2854 | 57 #include "xstrtol.h" |
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58 |
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59 #include "gettext.h" |
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60 #define _(msgid) gettext (msgid) |
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61 #define N_(msgid) msgid |
| 2273 | 62 |
| 5 | 63 #ifndef _POSIX_VERSION |
| 64 struct passwd *getpwnam (); | |
| 65 struct group *getgrnam (); | |
| 66 struct group *getgrgid (); | |
| 67 #endif | |
| 68 | |
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69 #ifndef HAVE_ENDGRENT |
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70 # define endgrent() ((void) 0) |
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71 #endif |
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72 |
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73 #ifndef HAVE_ENDPWENT |
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74 # define endpwent() ((void) 0) |
| 5 | 75 #endif |
| 76 | |
| 2854 | 77 #ifndef CHAR_BIT |
| 78 # define CHAR_BIT 8 | |
| 79 #endif | |
| 80 | |
| 81 /* The extra casts work around common compiler bugs. */ | |
| 82 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) | |
| 83 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0. | |
| 84 It is necessary at least when t == time_t. */ | |
| 85 #define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \ | |
| 86 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0)) | |
| 87 #define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t))) | |
| 88 | |
| 89 #ifndef UID_T_MAX | |
| 90 # define UID_T_MAX TYPE_MAXIMUM (uid_t) | |
| 91 #endif | |
| 92 | |
| 93 #ifndef GID_T_MAX | |
| 94 # define GID_T_MAX TYPE_MAXIMUM (gid_t) | |
| 95 #endif | |
| 96 | |
| 97 /* MAXUID may come from limits.h or sys/params.h. */ | |
| 98 #ifndef MAXUID | |
| 99 # define MAXUID UID_T_MAX | |
| 100 #endif | |
| 101 #ifndef MAXGID | |
| 102 # define MAXGID GID_T_MAX | |
| 103 #endif | |
| 104 | |
| 230 | 105 /* Perform the equivalent of the statement `dest = strdup (src);', |
| 106 but obtaining storage via alloca instead of from the heap. */ | |
| 107 | |
| 108 #define V_STRDUP(dest, src) \ | |
| 109 do \ | |
| 110 { \ | |
| 111 int _len = strlen ((src)); \ | |
| 112 (dest) = (char *) alloca (_len + 1); \ | |
| 113 strcpy (dest, src); \ | |
| 114 } \ | |
| 115 while (0) | |
| 116 | |
| 2271 | 117 /* ISDIGIT differs from isdigit, as follows: |
| 118 - Its arg may be any int or unsigned int; it need not be an unsigned char. | |
| 119 - It's guaranteed to evaluate its argument exactly once. | |
| 120 - It's typically faster. | |
| 3699 | 121 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to |
| 122 ISDIGIT_LOCALE unless it's important to use the locale's definition | |
| 123 of `digit' even when the host does not conform to POSIX. */ | |
| 2271 | 124 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) |
| 5 | 125 |
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126 #ifndef strdup |
| 5 | 127 char *strdup (); |
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128 #endif |
| 194 | 129 |
| 130 /* Return nonzero if STR represents an unsigned decimal integer, | |
| 131 otherwise return 0. */ | |
| 132 | |
| 133 static int | |
| 1557 | 134 is_number (const char *str) |
| 194 | 135 { |
| 136 for (; *str; str++) | |
| 2271 | 137 if (!ISDIGIT (*str)) |
| 194 | 138 return 0; |
| 139 return 1; | |
| 140 } | |
| 5 | 141 |
| 142 /* Extract from NAME, which has the form "[user][:.][group]", | |
| 143 a USERNAME, UID U, GROUPNAME, and GID G. | |
| 144 Either user or group, or both, must be present. | |
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145 If the group is omitted but the ":" separator is given, |
| 5 | 146 use the given user's login group. |
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147 If SPEC_ARG contains a `:', then use that as the separator, ignoring |
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148 any `.'s. If there is no `:', but there is a `.', then first look |
| 3049 | 149 up the entire SPEC_ARG as a login name. If that look-up fails, then |
| 150 try again interpreting the `.' as a separator. | |
| 5 | 151 |
| 152 USERNAME and GROUPNAME will be in newly malloc'd memory. | |
| 153 Either one might be NULL instead, indicating that it was not | |
| 154 given and the corresponding numeric ID was left unchanged. | |
| 155 | |
| 156 Return NULL if successful, a static error message string if not. */ | |
| 157 | |
| 194 | 158 const char * |
| 1580 | 159 parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid, |
| 160 char **username_arg, char **groupname_arg) | |
| 5 | 161 { |
| 2273 | 162 static const char *E_invalid_user = N_("invalid user"); |
| 163 static const char *E_invalid_group = N_("invalid group"); | |
| 164 static const char *E_bad_spec = | |
| 165 N_("cannot get the login group of a numeric UID"); | |
| 166 static const char *E_cannot_omit_both = | |
| 167 N_("cannot omit both user and group"); | |
| 168 | |
| 194 | 169 const char *error_msg; |
| 170 char *spec; /* A copy we can write on. */ | |
| 5 | 171 struct passwd *pwd; |
| 172 struct group *grp; | |
| 194 | 173 char *g, *u, *separator; |
| 230 | 174 char *groupname; |
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175 int maybe_retry = 0; |
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176 char *dot = NULL; |
| 5 | 177 |
| 194 | 178 error_msg = NULL; |
| 230 | 179 *username_arg = *groupname_arg = NULL; |
| 180 groupname = NULL; | |
| 5 | 181 |
| 231 | 182 V_STRDUP (spec, spec_arg); |
| 194 | 183 |
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184 /* Find the POSIX `:' separator if there is one. */ |
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185 separator = strchr (spec, ':'); |
| 2273 | 186 |
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187 /* If there is no colon, then see if there's a `.'. */ |
| 194 | 188 if (separator == NULL) |
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189 { |
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190 dot = strchr (spec, '.'); |
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191 /* If there's no colon but there is a `.', then first look up the |
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192 whole spec, in case it's an OWNER name that includes a dot. |
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193 If that fails, then we'll try again, but interpreting the `.' |
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194 as a separator. */ |
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195 /* FIXME: accepting `.' as the separator is contrary to POSIX. |
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196 someday we should drop support for this. */ |
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197 if (dot) |
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198 maybe_retry = 1; |
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199 } |
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200 |
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201 retry: |
| 194 | 202 |
| 203 /* Replace separator with a NUL. */ | |
| 204 if (separator != NULL) | |
| 205 *separator = '\0'; | |
| 206 | |
| 207 /* Set U and G to non-zero length strings corresponding to user and | |
| 208 group specifiers or to NULL. */ | |
| 209 u = (*spec == '\0' ? NULL : spec); | |
| 210 | |
| 211 g = (separator == NULL || *(separator + 1) == '\0' | |
| 212 ? NULL | |
| 213 : separator + 1); | |
| 214 | |
| 215 if (u == NULL && g == NULL) | |
| 2273 | 216 return _(E_cannot_omit_both); |
| 194 | 217 |
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218 #ifdef __DJGPP__ |
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219 /* Pretend that we are the user U whose group is G. This makes |
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220 pwd and grp functions ``know'' about the UID and GID of these. */ |
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221 if (u && !is_number (u)) |
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222 setenv ("USER", u, 1); |
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223 if (g && !is_number (g)) |
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224 setenv ("GROUP", g, 1); |
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225 #endif |
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226 |
| 194 | 227 if (u != NULL) |
| 5 | 228 { |
| 194 | 229 pwd = getpwnam (u); |
| 230 if (pwd == NULL) | |
| 5 | 231 { |
| 194 | 232 |
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233 if (!is_number (u)) |
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234 error_msg = E_invalid_user; |
| 5 | 235 else |
| 194 | 236 { |
| 237 int use_login_group; | |
| 238 use_login_group = (separator != NULL && g == NULL); | |
| 239 if (use_login_group) | |
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240 error_msg = E_bad_spec; |
| 194 | 241 else |
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242 { |
| 2854 | 243 unsigned long int tmp_long; |
| 244 if (xstrtoul (u, NULL, 0, &tmp_long, NULL) != LONGINT_OK | |
| 245 || tmp_long > MAXUID) | |
| 246 return _(E_invalid_user); | |
| 247 *uid = tmp_long; | |
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248 } |
| 194 | 249 } |
| 5 | 250 } |
| 251 else | |
| 252 { | |
| 194 | 253 *uid = pwd->pw_uid; |
| 254 if (g == NULL && separator != NULL) | |
| 5 | 255 { |
| 194 | 256 /* A separator was given, but a group was not specified, |
| 257 so get the login group. */ | |
| 258 *gid = pwd->pw_gid; | |
| 259 grp = getgrgid (pwd->pw_gid); | |
| 260 if (grp == NULL) | |
| 261 { | |
| 262 /* This is enough room to hold the unsigned decimal | |
| 263 representation of any 32-bit quantity and the trailing | |
| 264 zero byte. */ | |
| 265 char uint_buf[21]; | |
| 266 sprintf (uint_buf, "%u", (unsigned) (pwd->pw_gid)); | |
| 230 | 267 V_STRDUP (groupname, uint_buf); |
| 194 | 268 } |
| 269 else | |
| 270 { | |
| 230 | 271 V_STRDUP (groupname, grp->gr_name); |
| 194 | 272 } |
| 273 endgrent (); | |
| 5 | 274 } |
| 194 | 275 } |
| 276 endpwent (); | |
| 5 | 277 } |
| 278 | |
| 195 | 279 if (g != NULL && error_msg == NULL) |
| 194 | 280 { |
| 281 /* Explicit group. */ | |
| 282 grp = getgrnam (g); | |
| 283 if (grp == NULL) | |
| 284 { | |
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285 if (!is_number (g)) |
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286 error_msg = E_invalid_group; |
| 194 | 287 else |
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288 { |
| 2854 | 289 unsigned long int tmp_long; |
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290 if (xstrtoul (g, NULL, 0, &tmp_long, NULL) != LONGINT_OK |
| 2854 | 291 || tmp_long > MAXGID) |
| 292 return _(E_invalid_group); | |
| 293 *gid = tmp_long; | |
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parents:
2271
diff
changeset
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294 } |
| 194 | 295 } |
| 296 else | |
| 297 *gid = grp->gr_gid; | |
| 298 endgrent (); /* Save a file descriptor. */ | |
| 5 | 299 |
| 194 | 300 if (error_msg == NULL) |
| 230 | 301 V_STRDUP (groupname, g); |
| 5 | 302 } |
| 194 | 303 |
| 230 | 304 if (error_msg == NULL) |
| 5 | 305 { |
| 230 | 306 if (u != NULL) |
| 307 { | |
| 308 *username_arg = strdup (u); | |
| 309 if (*username_arg == NULL) | |
|
2810
aff553209434
(same_name): Invoke xalloc_die instead of printing our own message.
Jim Meyering <jim@meyering.net>
parents:
2284
diff
changeset
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310 error_msg = xalloc_msg_memory_exhausted; |
| 230 | 311 } |
| 312 | |
| 313 if (groupname != NULL && error_msg == NULL) | |
| 5 | 314 { |
| 230 | 315 *groupname_arg = strdup (groupname); |
| 316 if (*groupname_arg == NULL) | |
| 317 { | |
| 318 if (*username_arg != NULL) | |
| 319 { | |
| 320 free (*username_arg); | |
| 321 *username_arg = NULL; | |
| 322 } | |
|
2810
aff553209434
(same_name): Invoke xalloc_die instead of printing our own message.
Jim Meyering <jim@meyering.net>
parents:
2284
diff
changeset
|
323 error_msg = xalloc_msg_memory_exhausted; |
| 230 | 324 } |
| 5 | 325 } |
| 326 } | |
| 194 | 327 |
|
2284
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
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328 if (error_msg && maybe_retry) |
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ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
329 { |
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ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
330 maybe_retry = 0; |
|
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
331 separator = dot; |
|
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
332 error_msg = NULL; |
|
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
333 goto retry; |
|
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
334 } |
|
ce1bca7b77d5
(parse_user_spec): If there is no `:' but there is a `.',
Jim Meyering <jim@meyering.net>
parents:
2273
diff
changeset
|
335 |
|
2810
aff553209434
(same_name): Invoke xalloc_die instead of printing our own message.
Jim Meyering <jim@meyering.net>
parents:
2284
diff
changeset
|
336 return _(error_msg); |
| 5 | 337 } |
| 338 | |
|
232
0d9395790eb7
(main): Change #ifdef TESTING to TEST.
Jim Meyering <jim@meyering.net>
parents:
231
diff
changeset
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339 #ifdef TEST |
| 194 | 340 |
| 966 | 341 # define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) |
| 194 | 342 |
| 343 int | |
| 344 main (int argc, char **argv) | |
| 345 { | |
| 346 int i; | |
| 347 | |
| 348 for (i = 1; i < argc; i++) | |
| 349 { | |
| 350 const char *e; | |
| 351 char *username, *groupname; | |
| 352 uid_t uid; | |
| 353 gid_t gid; | |
| 354 char *tmp; | |
| 5 | 355 |
| 194 | 356 tmp = strdup (argv[i]); |
| 357 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 358 free (tmp); | |
| 359 printf ("%s: %u %u %s %s %s\n", | |
| 360 argv[i], | |
| 361 (unsigned int) uid, | |
| 362 (unsigned int) gid, | |
| 363 NULL_CHECK (username), | |
| 364 NULL_CHECK (groupname), | |
| 365 NULL_CHECK (e)); | |
| 366 } | |
| 367 | |
| 368 exit (0); | |
| 5 | 369 } |
| 194 | 370 |
| 371 #endif |