Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/userspec.c @ 6275:fd0ccce602e4
Sync from coreutils.
* .cppi-disable: Add regcomp.c, regex_internal.c, regex_internal.h,
stat-time.h.
* argmatch.h: Include verify.h
(ARGMATCH_VERIFY): Use verify rather than rolling our own.
(ARGMATCH_ASSERT): Remove; unused.
* canonicalize.c: Assume STDC_HEADERS.
* exclude.c: Include "strcase.h".
* regex_internal.h [!defined _LIBC]: Likewise.
* getusershell.c: Include stdio--.h rather than stdio.h
and stdio-safer.h.
(getusershell): Call fopen, not fopen_safer.
* save-cwd.c: Include fcntl--.h rather than fcntl.h.
Do not include unistd-safer.h.
(save_cwd): Don't call fd_safer; no longer needed
now that we include fcntl--.h.
* modules/argmatch (Depends-on): Add verify.
* modules/getloadavg (Depends-on): Depend on fcntl-safer, not
unistd-safer.
* modules/save-cwd (Depends-on): Likewise.
* backupfile.m4, calloc.m4, chown.m4, cloexec.m4, dup2.m4:
* fileblocks.m4, free.m4, ftruncate.m4, getcwd.m4, getpagesize.m4:
* getugroups.m4, group-member.m4, idcache.m4, link-follow.m4:
* mkstemp.m4, mktime.m4, mountlist.m4, nanosleep.m4, pathmax.m4:
* physmem.m4, posixver.m4, putenv.m4, safe-read.m4, same.m4:
* save-cwd.m4, stdio-safer.m4, unistd-safer.m4, unlinkdir.m4:
* userspec.m4, xgetcwd.m4, xreadlink.m4:
Don't bother checking for string.h, stdlib.h, unistd.h.
* fts.m4 (gl_FUNC_FTS_CORE): Don't require
AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK; that's now the lstat
module's job.
* jm-macros.m4 (gl_MACROS): Likewise.
* prereq.m4 (gl_PREREQ): Add gl_FUNC_LSTAT.
* backupfile.c: Use ARGMATCH_VERIFY, just in case.
* posixtm.c (posixtime) [lint]: Initialize *all* of tm0, not just
the .tm_year member, since otherwise gcc-4.0 would now warn about
tm_zone, tm_gmtoff, tm_isdst, tm_yday, tm_wday.
* quotearg.c (quotearg_n_options): Change code to be suboptimal, in
order to avoid an unsuppressible warning from gcc on 64-bit systems.
* lstat.m4 (gl_FUNC_LSTAT):
Use AC_LIBSOURCES to require lstat.c and lstat.h.
Remove obsolete comment.
* xreadlink.m4: Use AC_LIBSOURCES and AC_LIBOBJ.
* xstrtod.m4: Likewise.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 23 Sep 2005 04:15:13 +0000 |
| parents | 96c32553b4c6 |
| children | 6aeb4d6c28d9 |
| 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, 2002-2005 Free Software |
| 4844 | 3 Foundation, Inc. |
| 5 | 4 |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
|
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16 along with this program; if not, write to the Free Software Foundation, |
|
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 5 | 18 |
| 19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
| 966 | 20 |
|
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21 #ifdef HAVE_CONFIG_H |
| 966 | 22 # include <config.h> |
| 105 | 23 #endif |
| 24 | |
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25 /* Specification. */ |
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26 #include "userspec.h" |
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27 |
| 5159 | 28 #include <stdbool.h> |
| 5 | 29 #include <stdio.h> |
| 30 #include <sys/types.h> | |
| 31 #include <pwd.h> | |
| 32 #include <grp.h> | |
| 33 | |
| 2854 | 34 #if HAVE_SYS_PARAM_H |
| 35 # include <sys/param.h> | |
| 36 #endif | |
| 37 | |
| 4333 | 38 #include <limits.h> |
| 4691 | 39 #include <stdlib.h> |
| 40 #include <string.h> | |
| 5 | 41 |
| 6275 | 42 #include <unistd.h> |
| 5 | 43 |
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44 #include "intprops.h" |
| 5159 | 45 #include "inttostr.h" |
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46 #include "strdup.h" |
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47 #include "xalloc.h" |
| 2854 | 48 #include "xstrtol.h" |
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49 |
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50 #include "gettext.h" |
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51 #define _(msgid) gettext (msgid) |
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52 #define N_(msgid) msgid |
| 2273 | 53 |
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54 #ifndef HAVE_ENDGRENT |
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55 # define endgrent() ((void) 0) |
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56 #endif |
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57 |
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58 #ifndef HAVE_ENDPWENT |
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59 # define endpwent() ((void) 0) |
| 5 | 60 #endif |
| 61 | |
| 2854 | 62 #ifndef UID_T_MAX |
| 63 # define UID_T_MAX TYPE_MAXIMUM (uid_t) | |
| 64 #endif | |
| 65 | |
| 66 #ifndef GID_T_MAX | |
| 67 # define GID_T_MAX TYPE_MAXIMUM (gid_t) | |
| 68 #endif | |
| 69 | |
| 70 /* MAXUID may come from limits.h or sys/params.h. */ | |
| 71 #ifndef MAXUID | |
| 72 # define MAXUID UID_T_MAX | |
| 73 #endif | |
| 74 #ifndef MAXGID | |
| 75 # define MAXGID GID_T_MAX | |
| 76 #endif | |
| 77 | |
| 2271 | 78 /* ISDIGIT differs from isdigit, as follows: |
| 79 - Its arg may be any int or unsigned int; it need not be an unsigned char. | |
| 80 - It's guaranteed to evaluate its argument exactly once. | |
| 81 - It's typically faster. | |
| 3699 | 82 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to |
| 83 ISDIGIT_LOCALE unless it's important to use the locale's definition | |
| 84 of `digit' even when the host does not conform to POSIX. */ | |
| 5159 | 85 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9) |
| 86 | |
| 87 #ifdef __DJGPP__ | |
| 5 | 88 |
| 5159 | 89 /* Return true if STR represents an unsigned decimal integer. */ |
| 194 | 90 |
| 5159 | 91 static bool |
| 1557 | 92 is_number (const char *str) |
| 194 | 93 { |
| 5159 | 94 do |
| 95 { | |
| 96 if (!ISDIGIT (*str)) | |
| 97 return false; | |
| 98 } | |
| 99 while (*++str); | |
| 100 | |
| 101 return true; | |
| 194 | 102 } |
| 5159 | 103 #endif |
| 5 | 104 |
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105 static char const * |
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106 parse_with_separator (char const *spec, char const *separator, |
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107 uid_t *uid, gid_t *gid, |
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108 char **username, char **groupname) |
| 5 | 109 { |
| 2273 | 110 static const char *E_invalid_user = N_("invalid user"); |
| 111 static const char *E_invalid_group = N_("invalid group"); | |
| 112 static const char *E_bad_spec = | |
| 113 N_("cannot get the login group of a numeric UID"); | |
| 114 | |
| 194 | 115 const char *error_msg; |
| 5 | 116 struct passwd *pwd; |
| 117 struct group *grp; | |
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118 char *u; |
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119 char const *g; |
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120 char *gname = NULL; |
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121 uid_t unum = *uid; |
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122 gid_t gnum = *gid; |
| 5 | 123 |
| 194 | 124 error_msg = NULL; |
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125 *username = *groupname = NULL; |
| 194 | 126 |
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127 /* Set U and G to nonzero length strings corresponding to user and |
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128 group specifiers or to NULL. If U is not NULL, it is a newly |
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129 allocated string. */ |
| 2273 | 130 |
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131 u = NULL; |
| 4996 | 132 if (separator == NULL) |
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133 { |
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134 if (*spec) |
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135 u = xstrdup (spec); |
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136 } |
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137 else |
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138 { |
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139 size_t ulen = separator - spec; |
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140 if (ulen != 0) |
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141 { |
| 5322 | 142 u = xmemdup (spec, ulen + 1); |
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143 u[ulen] = '\0'; |
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144 } |
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145 } |
| 194 | 146 |
| 147 g = (separator == NULL || *(separator + 1) == '\0' | |
| 148 ? NULL | |
| 149 : separator + 1); | |
| 150 | |
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151 #ifdef __DJGPP__ |
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152 /* Pretend that we are the user U whose group is G. This makes |
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153 pwd and grp functions ``know'' about the UID and GID of these. */ |
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154 if (u && !is_number (u)) |
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155 setenv ("USER", u, 1); |
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156 if (g && !is_number (g)) |
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157 setenv ("GROUP", g, 1); |
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158 #endif |
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159 |
| 194 | 160 if (u != NULL) |
| 5 | 161 { |
| 194 | 162 pwd = getpwnam (u); |
| 163 if (pwd == NULL) | |
| 5 | 164 { |
| 5159 | 165 bool use_login_group = (separator != NULL && g == NULL); |
| 166 if (use_login_group) | |
| 167 error_msg = E_bad_spec; | |
| 5 | 168 else |
| 194 | 169 { |
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170 unsigned long int tmp; |
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171 if (xstrtoul (u, NULL, 10, &tmp, "") == LONGINT_OK |
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172 && tmp <= MAXUID) |
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173 unum = tmp; |
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174 else |
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175 error_msg = E_invalid_user; |
| 194 | 176 } |
| 5 | 177 } |
| 178 else | |
| 179 { | |
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180 unum = pwd->pw_uid; |
| 194 | 181 if (g == NULL && separator != NULL) |
| 5 | 182 { |
| 194 | 183 /* A separator was given, but a group was not specified, |
| 184 so get the login group. */ | |
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185 char buf[INT_BUFSIZE_BOUND (uintmax_t)]; |
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186 gnum = pwd->pw_gid; |
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187 grp = getgrgid (gnum); |
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188 gname = xstrdup (grp ? grp->gr_name : umaxtostr (gnum, buf)); |
| 194 | 189 endgrent (); |
| 5 | 190 } |
| 194 | 191 } |
| 192 endpwent (); | |
| 5 | 193 } |
| 194 | |
| 195 | 195 if (g != NULL && error_msg == NULL) |
| 194 | 196 { |
| 197 /* Explicit group. */ | |
| 198 grp = getgrnam (g); | |
| 199 if (grp == NULL) | |
| 200 { | |
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201 unsigned long int tmp; |
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202 if (xstrtoul (g, NULL, 10, &tmp, "") == LONGINT_OK && tmp <= MAXGID) |
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203 gnum = tmp; |
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204 else |
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205 error_msg = E_invalid_group; |
| 194 | 206 } |
| 207 else | |
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208 gnum = grp->gr_gid; |
| 194 | 209 endgrent (); /* Save a file descriptor. */ |
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210 gname = xstrdup (g); |
| 5 | 211 } |
| 194 | 212 |
| 230 | 213 if (error_msg == NULL) |
| 5 | 214 { |
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215 *uid = unum; |
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216 *gid = gnum; |
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217 *username = u; |
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218 *groupname = gname; |
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219 u = NULL; |
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220 } |
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221 else |
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222 free (gname); |
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223 |
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224 free (u); |
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225 return _(error_msg); |
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226 } |
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227 |
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228 /* Extract from SPEC, which has the form "[user][:.][group]", |
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229 a USERNAME, UID U, GROUPNAME, and GID G. |
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230 Either user or group, or both, must be present. |
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231 If the group is omitted but the separator is given, |
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232 use the given user's login group. |
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233 If SPEC contains a `:', then use that as the separator, ignoring |
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234 any `.'s. If there is no `:', but there is a `.', then first look |
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235 up the entire SPEC as a login name. If that look-up fails, then |
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236 try again interpreting the `.' as a separator. |
| 230 | 237 |
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238 USERNAME and GROUPNAME will be in newly malloc'd memory. |
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239 Either one might be NULL instead, indicating that it was not |
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240 given and the corresponding numeric ID was left unchanged. |
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241 |
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242 Return NULL if successful, a static error message string if not. */ |
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243 |
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244 char const * |
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245 parse_user_spec (char const *spec, uid_t *uid, gid_t *gid, |
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246 char **username, char **groupname) |
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247 { |
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248 char const *colon = strchr (spec, ':'); |
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249 char const *error_msg = |
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250 parse_with_separator (spec, colon, uid, gid, username, groupname); |
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251 |
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252 if (!colon && error_msg) |
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253 { |
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254 /* If there's no colon but there is a dot, and if looking up the |
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255 whole spec failed (i.e., the spec is not a owner name that |
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256 includes a dot), then try again, but interpret the dot as a |
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257 separator. This is a compatible extension to POSIX, since |
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258 the POSIX-required behavior is always tried first. */ |
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259 |
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260 char const *dot = strchr (spec, '.'); |
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261 if (dot |
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262 && ! parse_with_separator (spec, dot, uid, gid, username, groupname)) |
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263 error_msg = NULL; |
| 5 | 264 } |
| 194 | 265 |
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266 return error_msg; |
| 5 | 267 } |
| 268 | |
|
232
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269 #ifdef TEST |
| 194 | 270 |
| 966 | 271 # define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) |
| 194 | 272 |
| 273 int | |
| 274 main (int argc, char **argv) | |
| 275 { | |
| 276 int i; | |
| 277 | |
| 278 for (i = 1; i < argc; i++) | |
| 279 { | |
| 280 const char *e; | |
| 281 char *username, *groupname; | |
| 282 uid_t uid; | |
| 283 gid_t gid; | |
| 284 char *tmp; | |
| 5 | 285 |
| 194 | 286 tmp = strdup (argv[i]); |
| 287 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 288 free (tmp); | |
| 5159 | 289 printf ("%s: %lu %lu %s %s %s\n", |
| 194 | 290 argv[i], |
| 5159 | 291 (unsigned long int) uid, |
| 292 (unsigned long int) gid, | |
| 194 | 293 NULL_CHECK (username), |
| 294 NULL_CHECK (groupname), | |
| 295 NULL_CHECK (e)); | |
| 296 } | |
| 297 | |
| 298 exit (0); | |
| 5 | 299 } |
| 194 | 300 |
| 301 #endif |