Mercurial > hg > octave-kai > gnulib-hg
annotate lib/userspec.c @ 194:1a1e462a2bea
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| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Mon, 14 Mar 1994 18:41:13 +0000 (1994-03-14) |
| parents | e03c39815941 |
| children | ed9f884b64fc |
| rev | line source |
|---|---|
| 5 | 1 /* userspec.c -- Parse a user and group string. |
| 2 Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. | |
| 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 | |
| 15 along with this program; if not, write to the Free Software | |
| 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 17 | |
| 18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
| 19 | |
| 105 | 20 #ifdef HAVE_CONFIG_H |
| 21 #if defined (CONFIG_BROKETS) | |
| 22 /* We use <config.h> instead of "config.h" so that a compilation | |
| 126 | 23 using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h |
| 24 (which it would do because it found this file in $srcdir). */ | |
| 105 | 25 #include <config.h> |
| 26 #else | |
| 27 #include "config.h" | |
| 28 #endif | |
| 29 #endif | |
| 30 | |
| 5 | 31 #include <stdio.h> |
| 32 #include <sys/types.h> | |
| 33 #include <pwd.h> | |
| 34 #include <grp.h> | |
| 35 | |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
36 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H) |
| 5 | 37 #include <string.h> |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
38 #ifndef index |
| 5 | 39 #define index strchr |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
40 #endif |
| 5 | 41 #else |
| 42 #include <strings.h> | |
| 43 #endif | |
| 44 | |
| 45 #ifdef STDC_HEADERS | |
| 46 #include <stdlib.h> | |
| 47 #else | |
| 48 char *malloc (); | |
| 49 #endif | |
| 50 | |
| 51 #ifdef HAVE_UNISTD_H | |
| 52 #include <unistd.h> | |
| 53 #endif | |
| 54 | |
| 55 #ifndef _POSIX_VERSION | |
| 56 struct passwd *getpwnam (); | |
| 57 struct group *getgrnam (); | |
| 58 struct group *getgrgid (); | |
| 59 #endif | |
| 60 | |
| 61 #ifdef _POSIX_SOURCE | |
| 62 #define endpwent() | |
| 63 #define endgrent() | |
| 64 #endif | |
| 65 | |
| 66 #define isdigit(c) ((c) >= '0' && (c) <= '9') | |
| 67 | |
| 68 char *strdup (); | |
| 194 | 69 |
| 70 /* Return nonzero if STR represents an unsigned decimal integer, | |
| 71 otherwise return 0. */ | |
| 72 | |
| 73 static int | |
| 74 isnumber (str) | |
| 75 const char *str; | |
| 76 { | |
| 77 for (; *str; str++) | |
| 78 if (!isdigit (*str)) | |
| 79 return 0; | |
| 80 return 1; | |
| 81 } | |
| 5 | 82 |
| 83 /* Extract from NAME, which has the form "[user][:.][group]", | |
| 84 a USERNAME, UID U, GROUPNAME, and GID G. | |
| 85 Either user or group, or both, must be present. | |
| 86 If the group is omitted but the ":" or "." separator is given, | |
| 87 use the given user's login group. | |
| 88 | |
| 89 USERNAME and GROUPNAME will be in newly malloc'd memory. | |
| 90 Either one might be NULL instead, indicating that it was not | |
| 91 given and the corresponding numeric ID was left unchanged. | |
| 92 | |
| 93 Return NULL if successful, a static error message string if not. */ | |
| 94 | |
| 194 | 95 const char * |
| 96 parse_user_spec (spec_arg, uid, gid, username, groupname) | |
| 97 const char *spec_arg; | |
| 5 | 98 uid_t *uid; |
| 99 gid_t *gid; | |
| 100 char **username, **groupname; | |
| 101 { | |
| 194 | 102 static const char *tired = "virtual memory exhausted"; |
| 103 const char *error_msg; | |
| 104 char *spec; /* A copy we can write on. */ | |
| 105 int spec_len; | |
| 5 | 106 struct passwd *pwd; |
| 107 struct group *grp; | |
| 194 | 108 char *g, *u, *separator; |
| 5 | 109 |
| 194 | 110 error_msg = NULL; |
| 5 | 111 *username = *groupname = NULL; |
| 112 | |
| 194 | 113 spec_len = strlen (spec_arg); |
| 114 spec = (char *) alloca (strlen (spec_arg) + 1); | |
| 115 strcpy (spec, spec_arg); | |
| 116 | |
| 117 /* Find the separator if there is one. */ | |
| 118 separator = index (spec, ':'); | |
| 119 if (separator == NULL) | |
| 120 separator = index (spec, '.'); | |
| 121 | |
| 122 /* Replace separator with a NUL. */ | |
| 123 if (separator != NULL) | |
| 124 *separator = '\0'; | |
| 125 | |
| 126 /* Set U and G to non-zero length strings corresponding to user and | |
| 127 group specifiers or to NULL. */ | |
| 128 u = (*spec == '\0' ? NULL : spec); | |
| 129 | |
| 130 g = (separator == NULL || *(separator + 1) == '\0' | |
| 131 ? NULL | |
| 132 : separator + 1); | |
| 133 | |
| 134 if (u == NULL && g == NULL) | |
| 135 return "can not omit both user and group"; | |
| 136 | |
| 137 if (u != NULL) | |
| 5 | 138 { |
| 194 | 139 pwd = getpwnam (u); |
| 140 if (pwd == NULL) | |
| 5 | 141 { |
| 194 | 142 |
| 143 if (!isnumber (u)) | |
| 144 error_msg = "invalid user"; | |
| 5 | 145 else |
| 194 | 146 { |
| 147 int use_login_group; | |
| 148 use_login_group = (separator != NULL && g == NULL); | |
| 149 if (use_login_group) | |
| 150 error_msg = "cannot get the login group of a numeric UID"; | |
| 151 else | |
| 152 *uid = atoi (u); | |
| 153 } | |
| 5 | 154 } |
| 155 else | |
| 156 { | |
| 194 | 157 *uid = pwd->pw_uid; |
| 158 if (g == NULL && separator != NULL) | |
| 5 | 159 { |
| 194 | 160 /* A separator was given, but a group was not specified, |
| 161 so get the login group. */ | |
| 162 *gid = pwd->pw_gid; | |
| 163 grp = getgrgid (pwd->pw_gid); | |
| 164 if (grp == NULL) | |
| 165 { | |
| 166 /* This is enough room to hold the unsigned decimal | |
| 167 representation of any 32-bit quantity and the trailing | |
| 168 zero byte. */ | |
| 169 char uint_buf[21]; | |
| 170 sprintf (uint_buf, "%u", (unsigned) (pwd->pw_gid)); | |
| 171 *groupname = strdup (uint_buf); | |
| 172 } | |
| 173 else | |
| 174 { | |
| 175 *groupname = strdup (grp->gr_name); | |
| 176 } | |
| 177 if (*groupname == NULL) | |
| 178 error_msg = tired; | |
| 179 endgrent (); | |
| 5 | 180 } |
| 194 | 181 } |
| 182 endpwent (); | |
| 183 | |
| 184 if (error_msg == NULL) | |
| 185 { | |
| 186 *username = strdup (u); | |
| 187 if (*username == NULL) | |
| 188 error_msg = tired; | |
| 5 | 189 } |
| 190 } | |
| 191 | |
| 194 | 192 if (g != NULL) |
| 193 { | |
| 194 /* Explicit group. */ | |
| 195 grp = getgrnam (g); | |
| 196 if (grp == NULL) | |
| 197 { | |
| 198 if (!isnumber (g)) | |
| 199 error_msg = "invalid group"; | |
| 200 else | |
| 201 *gid = atoi (g); | |
| 202 } | |
| 203 else | |
| 204 *gid = grp->gr_gid; | |
| 205 endgrent (); /* Save a file descriptor. */ | |
| 5 | 206 |
| 194 | 207 if (error_msg == NULL) |
| 208 { | |
| 209 *groupname = strdup (g); | |
| 210 if (*groupname == NULL) | |
| 211 return tired; | |
| 212 } | |
| 5 | 213 } |
| 194 | 214 |
| 215 if (error_msg) | |
| 5 | 216 { |
| 194 | 217 if (*groupname != NULL) |
| 5 | 218 { |
| 194 | 219 free (*groupname); |
| 220 *groupname = NULL; | |
| 221 } | |
| 222 if (*username != NULL) | |
| 223 { | |
| 224 free (*username); | |
| 225 *username = NULL; | |
| 5 | 226 } |
| 227 } | |
| 194 | 228 |
| 229 return error_msg; | |
| 5 | 230 } |
| 231 | |
| 194 | 232 #ifdef TESTING |
| 233 | |
| 234 #define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) | |
| 235 | |
| 236 int | |
| 237 main (int argc, char **argv) | |
| 238 { | |
| 239 int i; | |
| 240 | |
| 241 for (i = 1; i < argc; i++) | |
| 242 { | |
| 243 const char *e; | |
| 244 char *username, *groupname; | |
| 245 uid_t uid; | |
| 246 gid_t gid; | |
| 247 char *tmp; | |
| 5 | 248 |
| 194 | 249 tmp = strdup (argv[i]); |
| 250 e = parse_user_spec (tmp, &uid, &gid, &username, &groupname); | |
| 251 free (tmp); | |
| 252 printf ("%s: %u %u %s %s %s\n", | |
| 253 argv[i], | |
| 254 (unsigned int) uid, | |
| 255 (unsigned int) gid, | |
| 256 NULL_CHECK (username), | |
| 257 NULL_CHECK (groupname), | |
| 258 NULL_CHECK (e)); | |
| 259 } | |
| 260 | |
| 261 exit (0); | |
| 5 | 262 } |
| 194 | 263 |
| 264 #endif |