Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/userspec.c @ 7292:17785d5bede0
Fix docstrings
| author | Sergey Poznyakoff <gray@gnu.org.ua> |
|---|---|
| date | Sun, 10 Sep 2006 11:52:44 +0000 |
| parents | bbdf9204a185 |
| children | 8a1a9361108c |
| rev | line source |
|---|---|
| 5 | 1 /* userspec.c -- Parse a user and group string. |
| 6969 | 2 Copyright (C) 1989-1992, 1997-1998, 2000, 2002-2006 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: |
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79 - Its arg may be any int or unsigned int; it need not be an unsigned char |
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80 or EOF. |
| 2271 | 81 - It's typically faster. |
| 3699 | 82 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to |
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83 isdigit unless it's important to use the locale's definition |
| 3699 | 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"); | |
| 6969 | 112 static const char *E_bad_spec = N_("invalid spec"); |
| 2273 | 113 |
| 194 | 114 const char *error_msg; |
| 5 | 115 struct passwd *pwd; |
| 116 struct group *grp; | |
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117 char *u; |
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118 char const *g; |
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119 char *gname = NULL; |
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120 uid_t unum = *uid; |
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121 gid_t gnum = *gid; |
| 5 | 122 |
| 194 | 123 error_msg = NULL; |
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124 *username = *groupname = NULL; |
| 194 | 125 |
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126 /* Set U and G to nonzero length strings corresponding to user and |
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127 group specifiers or to NULL. If U is not NULL, it is a newly |
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128 allocated string. */ |
| 2273 | 129 |
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130 u = NULL; |
| 4996 | 131 if (separator == NULL) |
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132 { |
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133 if (*spec) |
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134 u = xstrdup (spec); |
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135 } |
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136 else |
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137 { |
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138 size_t ulen = separator - spec; |
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139 if (ulen != 0) |
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140 { |
| 5322 | 141 u = xmemdup (spec, ulen + 1); |
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142 u[ulen] = '\0'; |
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143 } |
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144 } |
| 194 | 145 |
| 146 g = (separator == NULL || *(separator + 1) == '\0' | |
| 147 ? NULL | |
| 148 : separator + 1); | |
| 149 | |
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150 #ifdef __DJGPP__ |
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151 /* Pretend that we are the user U whose group is G. This makes |
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152 pwd and grp functions ``know'' about the UID and GID of these. */ |
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153 if (u && !is_number (u)) |
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154 setenv ("USER", u, 1); |
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155 if (g && !is_number (g)) |
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156 setenv ("GROUP", g, 1); |
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157 #endif |
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158 |
| 194 | 159 if (u != NULL) |
| 5 | 160 { |
| 194 | 161 pwd = getpwnam (u); |
| 162 if (pwd == NULL) | |
| 5 | 163 { |
| 5159 | 164 bool use_login_group = (separator != NULL && g == NULL); |
| 165 if (use_login_group) | |
| 6969 | 166 { |
| 167 /* If there is no group, | |
| 168 then there may not be a trailing ":", either. */ | |
| 169 error_msg = E_bad_spec; | |
| 170 } | |
| 5 | 171 else |
| 194 | 172 { |
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173 unsigned long int tmp; |
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174 if (xstrtoul (u, NULL, 10, &tmp, "") == LONGINT_OK |
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175 && tmp <= MAXUID) |
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176 unum = tmp; |
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177 else |
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178 error_msg = E_invalid_user; |
| 194 | 179 } |
| 5 | 180 } |
| 181 else | |
| 182 { | |
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183 unum = pwd->pw_uid; |
| 194 | 184 if (g == NULL && separator != NULL) |
| 5 | 185 { |
| 194 | 186 /* A separator was given, but a group was not specified, |
| 187 so get the login group. */ | |
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188 char buf[INT_BUFSIZE_BOUND (uintmax_t)]; |
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189 gnum = pwd->pw_gid; |
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190 grp = getgrgid (gnum); |
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191 gname = xstrdup (grp ? grp->gr_name : umaxtostr (gnum, buf)); |
| 194 | 192 endgrent (); |
| 5 | 193 } |
| 194 | 194 } |
| 195 endpwent (); | |
| 5 | 196 } |
| 197 | |
| 195 | 198 if (g != NULL && error_msg == NULL) |
| 194 | 199 { |
| 200 /* Explicit group. */ | |
| 201 grp = getgrnam (g); | |
| 202 if (grp == NULL) | |
| 203 { | |
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204 unsigned long int tmp; |
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205 if (xstrtoul (g, NULL, 10, &tmp, "") == LONGINT_OK && tmp <= MAXGID) |
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206 gnum = tmp; |
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207 else |
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208 error_msg = E_invalid_group; |
| 194 | 209 } |
| 210 else | |
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211 gnum = grp->gr_gid; |
| 194 | 212 endgrent (); /* Save a file descriptor. */ |
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213 gname = xstrdup (g); |
| 5 | 214 } |
| 194 | 215 |
| 230 | 216 if (error_msg == NULL) |
| 5 | 217 { |
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218 *uid = unum; |
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219 *gid = gnum; |
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220 *username = u; |
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221 *groupname = gname; |
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222 u = NULL; |
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223 } |
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224 else |
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225 free (gname); |
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226 |
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227 free (u); |
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228 return _(error_msg); |
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229 } |
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230 |
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231 /* Extract from SPEC, which has the form "[user][:.][group]", |
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232 a USERNAME, UID U, GROUPNAME, and GID G. |
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233 Either user or group, or both, must be present. |
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234 If the group is omitted but the separator is given, |
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235 use the given user's login group. |
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236 If SPEC contains a `:', then use that as the separator, ignoring |
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237 any `.'s. If there is no `:', but there is a `.', then first look |
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238 up the entire SPEC as a login name. If that look-up fails, then |
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239 try again interpreting the `.' as a separator. |
| 230 | 240 |
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241 USERNAME and GROUPNAME will be in newly malloc'd memory. |
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242 Either one might be NULL instead, indicating that it was not |
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243 given and the corresponding numeric ID was left unchanged. |
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244 |
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245 Return NULL if successful, a static error message string if not. */ |
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246 |
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247 char const * |
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248 parse_user_spec (char const *spec, uid_t *uid, gid_t *gid, |
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249 char **username, char **groupname) |
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250 { |
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251 char const *colon = strchr (spec, ':'); |
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252 char const *error_msg = |
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253 parse_with_separator (spec, colon, uid, gid, username, groupname); |
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254 |
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255 if (!colon && error_msg) |
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256 { |
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257 /* If there's no colon but there is a dot, and if looking up the |
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258 whole spec failed (i.e., the spec is not a owner name that |
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259 includes a dot), then try again, but interpret the dot as a |
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260 separator. This is a compatible extension to POSIX, since |
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261 the POSIX-required behavior is always tried first. */ |
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262 |
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263 char const *dot = strchr (spec, '.'); |
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264 if (dot |
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265 && ! parse_with_separator (spec, dot, uid, gid, username, groupname)) |
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266 error_msg = NULL; |
| 5 | 267 } |
| 194 | 268 |
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269 return error_msg; |
| 5 | 270 } |
| 271 | |
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232
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272 #ifdef TEST |
| 194 | 273 |
| 966 | 274 # define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) |
| 194 | 275 |
| 276 int | |
| 277 main (int argc, char **argv) | |
| 278 { | |
| 279 int i; | |
| 280 | |
| 281 for (i = 1; i < argc; i++) | |
| 282 { | |
| 283 const char *e; | |
| 284 char *username, *groupname; | |
| 285 uid_t uid; | |
| 286 gid_t gid; | |
| 287 char *tmp; | |
| 5 | 288 |
| 194 | 289 tmp = strdup (argv[i]); |
| 290 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 291 free (tmp); | |
| 5159 | 292 printf ("%s: %lu %lu %s %s %s\n", |
| 194 | 293 argv[i], |
| 5159 | 294 (unsigned long int) uid, |
| 295 (unsigned long int) gid, | |
| 194 | 296 NULL_CHECK (username), |
| 297 NULL_CHECK (groupname), | |
| 298 NULL_CHECK (e)); | |
| 299 } | |
| 300 | |
| 301 exit (0); | |
| 5 | 302 } |
| 194 | 303 |
| 304 #endif |