Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/userspec.c @ 2272:9d6da67904b5
add FIXME comments for use of atoi
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Sat, 12 Feb 2000 10:11:54 +0000 |
| parents | 78563cb66dc8 |
| children | ad48a40e44bb |
| 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 | |
| 966 | 43 #if HAVE_STRING_H |
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44 # include <string.h> |
| 5 | 45 #else |
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46 # include <strings.h> |
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47 # ifndef strchr |
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48 # define strchr index |
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49 # endif |
| 5 | 50 #endif |
| 51 | |
| 966 | 52 #if STDC_HEADERS |
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53 # include <stdlib.h> |
| 5 | 54 #endif |
| 55 | |
| 966 | 56 #if HAVE_UNISTD_H |
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57 # include <unistd.h> |
| 5 | 58 #endif |
| 59 | |
| 60 #ifndef _POSIX_VERSION | |
| 61 struct passwd *getpwnam (); | |
| 62 struct group *getgrnam (); | |
| 63 struct group *getgrgid (); | |
| 64 #endif | |
| 65 | |
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66 #ifndef HAVE_ENDGRENT |
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67 # define endgrent() ((void) 0) |
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68 #endif |
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69 |
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70 #ifndef HAVE_ENDPWENT |
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71 # define endpwent() ((void) 0) |
| 5 | 72 #endif |
| 73 | |
| 230 | 74 /* Perform the equivalent of the statement `dest = strdup (src);', |
| 75 but obtaining storage via alloca instead of from the heap. */ | |
| 76 | |
| 77 #define V_STRDUP(dest, src) \ | |
| 78 do \ | |
| 79 { \ | |
| 80 int _len = strlen ((src)); \ | |
| 81 (dest) = (char *) alloca (_len + 1); \ | |
| 82 strcpy (dest, src); \ | |
| 83 } \ | |
| 84 while (0) | |
| 85 | |
| 2271 | 86 /* ISDIGIT differs from isdigit, as follows: |
| 87 - Its arg may be any int or unsigned int; it need not be an unsigned char. | |
| 88 - It's guaranteed to evaluate its argument exactly once. | |
| 89 - It's typically faster. | |
| 90 Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that | |
| 91 only '0' through '9' are digits. Prefer ISDIGIT to isdigit unless | |
| 92 it's important to use the locale's definition of `digit' even when the | |
| 93 host does not conform to Posix. */ | |
| 94 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9) | |
| 5 | 95 |
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96 #ifndef strdup |
| 5 | 97 char *strdup (); |
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98 #endif |
| 194 | 99 |
| 100 /* Return nonzero if STR represents an unsigned decimal integer, | |
| 101 otherwise return 0. */ | |
| 102 | |
| 103 static int | |
| 1557 | 104 is_number (const char *str) |
| 194 | 105 { |
| 106 for (; *str; str++) | |
| 2271 | 107 if (!ISDIGIT (*str)) |
| 194 | 108 return 0; |
| 109 return 1; | |
| 110 } | |
| 5 | 111 |
| 112 /* Extract from NAME, which has the form "[user][:.][group]", | |
| 113 a USERNAME, UID U, GROUPNAME, and GID G. | |
| 114 Either user or group, or both, must be present. | |
| 115 If the group is omitted but the ":" or "." separator is given, | |
| 116 use the given user's login group. | |
| 117 | |
| 118 USERNAME and GROUPNAME will be in newly malloc'd memory. | |
| 119 Either one might be NULL instead, indicating that it was not | |
| 120 given and the corresponding numeric ID was left unchanged. | |
| 121 | |
| 122 Return NULL if successful, a static error message string if not. */ | |
| 123 | |
| 194 | 124 const char * |
| 1580 | 125 parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid, |
| 126 char **username_arg, char **groupname_arg) | |
| 5 | 127 { |
| 194 | 128 static const char *tired = "virtual memory exhausted"; |
| 129 const char *error_msg; | |
| 130 char *spec; /* A copy we can write on. */ | |
| 5 | 131 struct passwd *pwd; |
| 132 struct group *grp; | |
| 194 | 133 char *g, *u, *separator; |
| 230 | 134 char *groupname; |
| 5 | 135 |
| 194 | 136 error_msg = NULL; |
| 230 | 137 *username_arg = *groupname_arg = NULL; |
| 138 groupname = NULL; | |
| 5 | 139 |
| 231 | 140 V_STRDUP (spec, spec_arg); |
| 194 | 141 |
| 142 /* Find the separator if there is one. */ | |
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143 separator = strchr (spec, ':'); |
| 194 | 144 if (separator == NULL) |
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145 separator = strchr (spec, '.'); |
| 194 | 146 |
| 147 /* Replace separator with a NUL. */ | |
| 148 if (separator != NULL) | |
| 149 *separator = '\0'; | |
| 150 | |
| 151 /* Set U and G to non-zero length strings corresponding to user and | |
| 152 group specifiers or to NULL. */ | |
| 153 u = (*spec == '\0' ? NULL : spec); | |
| 154 | |
| 155 g = (separator == NULL || *(separator + 1) == '\0' | |
| 156 ? NULL | |
| 157 : separator + 1); | |
| 158 | |
| 159 if (u == NULL && g == NULL) | |
| 160 return "can not omit both user and group"; | |
| 161 | |
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162 #ifdef __DJGPP__ |
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163 /* Pretend that we are the user U whose group is G. This makes |
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164 pwd and grp functions ``know'' about the UID and GID of these. */ |
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165 if (u && !is_number (u)) |
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166 setenv ("USER", u, 1); |
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167 if (g && !is_number (g)) |
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168 setenv ("GROUP", g, 1); |
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169 #endif |
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170 |
| 194 | 171 if (u != NULL) |
| 5 | 172 { |
| 194 | 173 pwd = getpwnam (u); |
| 174 if (pwd == NULL) | |
| 5 | 175 { |
| 194 | 176 |
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177 if (!is_number (u)) |
| 194 | 178 error_msg = "invalid user"; |
| 5 | 179 else |
| 194 | 180 { |
| 181 int use_login_group; | |
| 182 use_login_group = (separator != NULL && g == NULL); | |
| 183 if (use_login_group) | |
| 184 error_msg = "cannot get the login group of a numeric UID"; | |
| 185 else | |
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186 { |
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187 /* FIXME: don't use atoi! */ |
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188 *uid = atoi (u); |
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189 } |
| 194 | 190 } |
| 5 | 191 } |
| 192 else | |
| 193 { | |
| 194 | 194 *uid = pwd->pw_uid; |
| 195 if (g == NULL && separator != NULL) | |
| 5 | 196 { |
| 194 | 197 /* A separator was given, but a group was not specified, |
| 198 so get the login group. */ | |
| 199 *gid = pwd->pw_gid; | |
| 200 grp = getgrgid (pwd->pw_gid); | |
| 201 if (grp == NULL) | |
| 202 { | |
| 203 /* This is enough room to hold the unsigned decimal | |
| 204 representation of any 32-bit quantity and the trailing | |
| 205 zero byte. */ | |
| 206 char uint_buf[21]; | |
| 207 sprintf (uint_buf, "%u", (unsigned) (pwd->pw_gid)); | |
| 230 | 208 V_STRDUP (groupname, uint_buf); |
| 194 | 209 } |
| 210 else | |
| 211 { | |
| 230 | 212 V_STRDUP (groupname, grp->gr_name); |
| 194 | 213 } |
| 214 endgrent (); | |
| 5 | 215 } |
| 194 | 216 } |
| 217 endpwent (); | |
| 5 | 218 } |
| 219 | |
| 195 | 220 if (g != NULL && error_msg == NULL) |
| 194 | 221 { |
| 222 /* Explicit group. */ | |
| 223 grp = getgrnam (g); | |
| 224 if (grp == NULL) | |
| 225 { | |
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226 if (!is_number (g)) |
| 194 | 227 error_msg = "invalid group"; |
| 228 else | |
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229 { |
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230 /* FIXME: don't use atoi! */ |
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231 *gid = atoi (g); |
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232 } |
| 194 | 233 } |
| 234 else | |
| 235 *gid = grp->gr_gid; | |
| 236 endgrent (); /* Save a file descriptor. */ | |
| 5 | 237 |
| 194 | 238 if (error_msg == NULL) |
| 230 | 239 V_STRDUP (groupname, g); |
| 5 | 240 } |
| 194 | 241 |
| 230 | 242 if (error_msg == NULL) |
| 5 | 243 { |
| 230 | 244 if (u != NULL) |
| 245 { | |
| 246 *username_arg = strdup (u); | |
| 247 if (*username_arg == NULL) | |
| 248 error_msg = tired; | |
| 249 } | |
| 250 | |
| 251 if (groupname != NULL && error_msg == NULL) | |
| 5 | 252 { |
| 230 | 253 *groupname_arg = strdup (groupname); |
| 254 if (*groupname_arg == NULL) | |
| 255 { | |
| 256 if (*username_arg != NULL) | |
| 257 { | |
| 258 free (*username_arg); | |
| 259 *username_arg = NULL; | |
| 260 } | |
| 261 error_msg = tired; | |
| 262 } | |
| 5 | 263 } |
| 264 } | |
| 194 | 265 |
| 266 return error_msg; | |
| 5 | 267 } |
| 268 | |
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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); | |
| 289 printf ("%s: %u %u %s %s %s\n", | |
| 290 argv[i], | |
| 291 (unsigned int) uid, | |
| 292 (unsigned int) gid, | |
| 293 NULL_CHECK (username), | |
| 294 NULL_CHECK (groupname), | |
| 295 NULL_CHECK (e)); | |
| 296 } | |
| 297 | |
| 298 exit (0); | |
| 5 | 299 } |
| 194 | 300 |
| 301 #endif |