Mercurial > hg > octave-kai > gnulib-hg
annotate lib/userspec.c @ 9352:970d5cb5b003
Relax the license.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Wed, 17 Oct 2007 02:11:05 +0200 |
| parents | bbbbbf4cd1c5 |
| children | 5442b2430859 |
| 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, 2002-2007 Free Software |
| 4844 | 3 Foundation, Inc. |
| 5 | 4 |
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5 This program is free software: you can redistribute it and/or modify |
| 5 | 6 it under the terms of the GNU General Public License as published by |
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7 the Free Software Foundation; either version 3 of the License, or |
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8 (at your option) any later version. |
| 5 | 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, see <http://www.gnu.org/licenses/>. */ |
| 5 | 17 |
| 18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
| 966 | 19 |
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20 #include <config.h> |
| 105 | 21 |
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22 /* Specification. */ |
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23 #include "userspec.h" |
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24 |
| 5159 | 25 #include <stdbool.h> |
| 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 | |
| 4333 | 35 #include <limits.h> |
| 4691 | 36 #include <stdlib.h> |
| 37 #include <string.h> | |
| 5 | 38 |
| 6275 | 39 #include <unistd.h> |
| 5 | 40 |
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41 #include "intprops.h" |
| 5159 | 42 #include "inttostr.h" |
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43 #include "xalloc.h" |
| 2854 | 44 #include "xstrtol.h" |
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45 |
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46 #include "gettext.h" |
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47 #define _(msgid) gettext (msgid) |
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48 #define N_(msgid) msgid |
| 2273 | 49 |
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50 #ifndef HAVE_ENDGRENT |
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51 # define endgrent() ((void) 0) |
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52 #endif |
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53 |
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54 #ifndef HAVE_ENDPWENT |
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55 # define endpwent() ((void) 0) |
| 5 | 56 #endif |
| 57 | |
| 2854 | 58 #ifndef UID_T_MAX |
| 59 # define UID_T_MAX TYPE_MAXIMUM (uid_t) | |
| 60 #endif | |
| 61 | |
| 62 #ifndef GID_T_MAX | |
| 63 # define GID_T_MAX TYPE_MAXIMUM (gid_t) | |
| 64 #endif | |
| 65 | |
| 66 /* MAXUID may come from limits.h or sys/params.h. */ | |
| 67 #ifndef MAXUID | |
| 68 # define MAXUID UID_T_MAX | |
| 69 #endif | |
| 70 #ifndef MAXGID | |
| 71 # define MAXGID GID_T_MAX | |
| 72 #endif | |
| 73 | |
| 2271 | 74 /* ISDIGIT differs from isdigit, as follows: |
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75 - Its arg may be any int or unsigned int; it need not be an unsigned char |
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76 or EOF. |
| 2271 | 77 - It's typically faster. |
| 3699 | 78 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to |
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79 isdigit unless it's important to use the locale's definition |
| 3699 | 80 of `digit' even when the host does not conform to POSIX. */ |
| 5159 | 81 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9) |
| 82 | |
| 83 #ifdef __DJGPP__ | |
| 5 | 84 |
| 5159 | 85 /* Return true if STR represents an unsigned decimal integer. */ |
| 194 | 86 |
| 5159 | 87 static bool |
| 1557 | 88 is_number (const char *str) |
| 194 | 89 { |
| 5159 | 90 do |
| 91 { | |
| 92 if (!ISDIGIT (*str)) | |
| 93 return false; | |
| 94 } | |
| 95 while (*++str); | |
| 96 | |
| 97 return true; | |
| 194 | 98 } |
| 5159 | 99 #endif |
| 5 | 100 |
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101 static char const * |
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102 parse_with_separator (char const *spec, char const *separator, |
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103 uid_t *uid, gid_t *gid, |
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104 char **username, char **groupname) |
| 5 | 105 { |
| 2273 | 106 static const char *E_invalid_user = N_("invalid user"); |
| 107 static const char *E_invalid_group = N_("invalid group"); | |
| 6969 | 108 static const char *E_bad_spec = N_("invalid spec"); |
| 2273 | 109 |
| 194 | 110 const char *error_msg; |
| 5 | 111 struct passwd *pwd; |
| 112 struct group *grp; | |
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113 char *u; |
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114 char const *g; |
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115 char *gname = NULL; |
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116 uid_t unum = *uid; |
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117 gid_t gnum = *gid; |
| 5 | 118 |
| 194 | 119 error_msg = NULL; |
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120 *username = *groupname = NULL; |
| 194 | 121 |
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122 /* Set U and G to nonzero length strings corresponding to user and |
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123 group specifiers or to NULL. If U is not NULL, it is a newly |
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124 allocated string. */ |
| 2273 | 125 |
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126 u = NULL; |
| 4996 | 127 if (separator == NULL) |
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128 { |
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129 if (*spec) |
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130 u = xstrdup (spec); |
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131 } |
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132 else |
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133 { |
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134 size_t ulen = separator - spec; |
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135 if (ulen != 0) |
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136 { |
| 5322 | 137 u = xmemdup (spec, ulen + 1); |
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138 u[ulen] = '\0'; |
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139 } |
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140 } |
| 194 | 141 |
| 142 g = (separator == NULL || *(separator + 1) == '\0' | |
| 143 ? NULL | |
| 144 : separator + 1); | |
| 145 | |
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146 #ifdef __DJGPP__ |
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147 /* Pretend that we are the user U whose group is G. This makes |
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148 pwd and grp functions ``know'' about the UID and GID of these. */ |
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149 if (u && !is_number (u)) |
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150 setenv ("USER", u, 1); |
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151 if (g && !is_number (g)) |
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152 setenv ("GROUP", g, 1); |
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153 #endif |
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154 |
| 194 | 155 if (u != NULL) |
| 5 | 156 { |
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157 /* If it starts with "+", skip the look-up. */ |
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158 pwd = (*u == '+' ? NULL : getpwnam (u)); |
| 194 | 159 if (pwd == NULL) |
| 5 | 160 { |
| 5159 | 161 bool use_login_group = (separator != NULL && g == NULL); |
| 162 if (use_login_group) | |
| 6969 | 163 { |
| 164 /* If there is no group, | |
| 165 then there may not be a trailing ":", either. */ | |
| 166 error_msg = E_bad_spec; | |
| 167 } | |
| 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. */ | |
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198 /* If it starts with "+", skip the look-up. */ |
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199 grp = (*g == '+' ? NULL : getgrnam (g)); |
| 194 | 200 if (grp == NULL) |
| 201 { | |
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202 unsigned long int tmp; |
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203 if (xstrtoul (g, NULL, 10, &tmp, "") == LONGINT_OK && tmp <= MAXGID) |
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204 gnum = tmp; |
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205 else |
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206 error_msg = E_invalid_group; |
| 194 | 207 } |
| 208 else | |
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209 gnum = grp->gr_gid; |
| 194 | 210 endgrent (); /* Save a file descriptor. */ |
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211 gname = xstrdup (g); |
| 5 | 212 } |
| 194 | 213 |
| 230 | 214 if (error_msg == NULL) |
| 5 | 215 { |
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216 *uid = unum; |
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217 *gid = gnum; |
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218 *username = u; |
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219 *groupname = gname; |
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220 u = NULL; |
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221 } |
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222 else |
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223 free (gname); |
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224 |
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225 free (u); |
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226 return _(error_msg); |
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227 } |
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228 |
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229 /* Extract from SPEC, which has the form "[user][:.][group]", |
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230 a USERNAME, UID U, GROUPNAME, and GID G. |
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231 Either user or group, or both, must be present. |
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232 If the group is omitted but the separator is given, |
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233 use the given user's login group. |
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234 If SPEC contains a `:', then use that as the separator, ignoring |
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235 any `.'s. If there is no `:', but there is a `.', then first look |
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236 up the entire SPEC as a login name. If that look-up fails, then |
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237 try again interpreting the `.' as a separator. |
| 230 | 238 |
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239 USERNAME and GROUPNAME will be in newly malloc'd memory. |
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240 Either one might be NULL instead, indicating that it was not |
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241 given and the corresponding numeric ID was left unchanged. |
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242 |
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243 Return NULL if successful, a static error message string if not. */ |
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244 |
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245 char const * |
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246 parse_user_spec (char const *spec, uid_t *uid, gid_t *gid, |
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247 char **username, char **groupname) |
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248 { |
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249 char const *colon = strchr (spec, ':'); |
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250 char const *error_msg = |
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251 parse_with_separator (spec, colon, uid, gid, username, groupname); |
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252 |
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253 if (!colon && error_msg) |
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254 { |
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255 /* If there's no colon but there is a dot, and if looking up the |
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256 whole spec failed (i.e., the spec is not a owner name that |
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257 includes a dot), then try again, but interpret the dot as a |
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258 separator. This is a compatible extension to POSIX, since |
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259 the POSIX-required behavior is always tried first. */ |
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260 |
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261 char const *dot = strchr (spec, '.'); |
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262 if (dot |
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263 && ! parse_with_separator (spec, dot, uid, gid, username, groupname)) |
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264 error_msg = NULL; |
| 5 | 265 } |
| 194 | 266 |
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267 return error_msg; |
| 5 | 268 } |
| 269 | |
|
232
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270 #ifdef TEST |
| 194 | 271 |
| 966 | 272 # define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) |
| 194 | 273 |
| 274 int | |
| 275 main (int argc, char **argv) | |
| 276 { | |
| 277 int i; | |
| 278 | |
| 279 for (i = 1; i < argc; i++) | |
| 280 { | |
| 281 const char *e; | |
| 282 char *username, *groupname; | |
| 283 uid_t uid; | |
| 284 gid_t gid; | |
| 285 char *tmp; | |
| 5 | 286 |
| 194 | 287 tmp = strdup (argv[i]); |
| 288 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 289 free (tmp); | |
| 5159 | 290 printf ("%s: %lu %lu %s %s %s\n", |
| 194 | 291 argv[i], |
| 5159 | 292 (unsigned long int) uid, |
| 293 (unsigned long int) gid, | |
| 194 | 294 NULL_CHECK (username), |
| 295 NULL_CHECK (groupname), | |
| 296 NULL_CHECK (e)); | |
| 297 } | |
| 298 | |
| 299 exit (0); | |
| 5 | 300 } |
| 194 | 301 |
| 302 #endif |