/* userspec.c -- Parse a user and group string.
- Copyright (C) 1989, 1990, 1991, 1992, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1989-1992, 1997-1998, 2000, 2002-2004 Free Software
+ Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
# include <config.h>
#endif
-#ifdef __GNUC__
-# define alloca __builtin_alloca
-#else
-# ifdef HAVE_ALLOCA_H
-# include <alloca.h>
-# else
-# ifdef _AIX
- # pragma alloca
-# else
-char *alloca ();
-# endif
-# endif
-#endif
+#include <alloca.h>
+
+/* Specification. */
+#include "userspec.h"
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
-#if HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-# ifndef strchr
-# define strchr index
-# endif
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
#endif
-#if STDC_HEADERS
-# include <stdlib.h>
-#endif
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
+#include "strdup.h"
+#include "posixver.h"
+#include "xalloc.h"
+#include "xstrtol.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+#define N_(msgid) msgid
+
#ifndef _POSIX_VERSION
struct passwd *getpwnam ();
struct group *getgrnam ();
# define endpwent() ((void) 0)
#endif
+/* The extra casts work around common compiler bugs. */
+#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
+ It is necessary at least when t == time_t. */
+#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
+ ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
+#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
+
+#ifndef UID_T_MAX
+# define UID_T_MAX TYPE_MAXIMUM (uid_t)
+#endif
+
+#ifndef GID_T_MAX
+# define GID_T_MAX TYPE_MAXIMUM (gid_t)
+#endif
+
+/* MAXUID may come from limits.h or sys/params.h. */
+#ifndef MAXUID
+# define MAXUID UID_T_MAX
+#endif
+#ifndef MAXGID
+# define MAXGID GID_T_MAX
+#endif
+
/* Perform the equivalent of the statement `dest = strdup (src);',
but obtaining storage via alloca instead of from the heap. */
} \
while (0)
-#define isdigit(c) ((c) >= '0' && (c) <= '9')
-
-char *strdup ();
+/* ISDIGIT differs from isdigit, as follows:
+ - Its arg may be any int or unsigned int; it need not be an unsigned char.
+ - It's guaranteed to evaluate its argument exactly once.
+ - It's typically faster.
+ POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
+ ISDIGIT_LOCALE unless it's important to use the locale's definition
+ of `digit' even when the host does not conform to POSIX. */
+#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
/* Return nonzero if STR represents an unsigned decimal integer,
otherwise return 0. */
static int
-is_number (str)
- const char *str;
+is_number (const char *str)
{
for (; *str; str++)
- if (!isdigit (*str))
+ if (!ISDIGIT (*str))
return 0;
return 1;
}
/* Extract from NAME, which has the form "[user][:.][group]",
a USERNAME, UID U, GROUPNAME, and GID G.
Either user or group, or both, must be present.
- If the group is omitted but the ":" or "." separator is given,
+ If the group is omitted but the ":" separator is given,
use the given user's login group.
+ If SPEC_ARG contains a `:', then use that as the separator, ignoring
+ any `.'s. If there is no `:', but there is a `.', then first look
+ up the entire SPEC_ARG as a login name. If that look-up fails, then
+ try again interpreting the `.' as a separator.
USERNAME and GROUPNAME will be in newly malloc'd memory.
Either one might be NULL instead, indicating that it was not
Return NULL if successful, a static error message string if not. */
const char *
-parse_user_spec (spec_arg, uid, gid, username_arg, groupname_arg)
- const char *spec_arg;
- uid_t *uid;
- gid_t *gid;
- char **username_arg, **groupname_arg;
+parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid,
+ char **username_arg, char **groupname_arg)
{
- static const char *tired = "virtual memory exhausted";
+ static const char *E_invalid_user = N_("invalid user");
+ static const char *E_invalid_group = N_("invalid group");
+ static const char *E_bad_spec =
+ N_("cannot get the login group of a numeric UID");
+ static const char *E_cannot_omit_both =
+ N_("cannot omit both user and group");
+
const char *error_msg;
char *spec; /* A copy we can write on. */
struct passwd *pwd;
struct group *grp;
char *g, *u, *separator;
char *groupname;
+ int maybe_retry = 0;
+ char *dot = NULL;
error_msg = NULL;
*username_arg = *groupname_arg = NULL;
V_STRDUP (spec, spec_arg);
- /* Find the separator if there is one. */
+ /* Find the POSIX `:' separator if there is one. */
separator = strchr (spec, ':');
- if (separator == NULL)
- separator = strchr (spec, '.');
+
+ /* If there is no colon, then see if there's a `.'. */
+ if (separator == NULL && posix2_version () < 200112)
+ {
+ dot = strchr (spec, '.');
+ /* If there's no colon but there is a `.', then first look up the
+ whole spec, in case it's an OWNER name that includes a dot.
+ If that fails, then we'll try again, but interpreting the `.'
+ as a separator. */
+ /* FIXME: accepting `.' as the separator is contrary to POSIX.
+ someday we should drop support for this. */
+ if (dot)
+ maybe_retry = 1;
+ }
+
+ retry:
/* Replace separator with a NUL. */
if (separator != NULL)
: separator + 1);
if (u == NULL && g == NULL)
- return "can not omit both user and group";
+ return _(E_cannot_omit_both);
#ifdef __DJGPP__
/* Pretend that we are the user U whose group is G. This makes
{
if (!is_number (u))
- error_msg = "invalid user";
+ error_msg = E_invalid_user;
else
{
int use_login_group;
use_login_group = (separator != NULL && g == NULL);
if (use_login_group)
- error_msg = "cannot get the login group of a numeric UID";
+ error_msg = E_bad_spec;
else
- *uid = atoi (u);
+ {
+ unsigned long int tmp_long;
+ if (xstrtoul (u, NULL, 0, &tmp_long, NULL) != LONGINT_OK
+ || tmp_long > MAXUID)
+ return _(E_invalid_user);
+ *uid = tmp_long;
+ }
}
}
else
if (grp == NULL)
{
if (!is_number (g))
- error_msg = "invalid group";
+ error_msg = E_invalid_group;
else
- *gid = atoi (g);
+ {
+ unsigned long int tmp_long;
+ if (xstrtoul (g, NULL, 0, &tmp_long, NULL) != LONGINT_OK
+ || tmp_long > MAXGID)
+ return _(E_invalid_group);
+ *gid = tmp_long;
+ }
}
else
*gid = grp->gr_gid;
{
*username_arg = strdup (u);
if (*username_arg == NULL)
- error_msg = tired;
+ error_msg = xalloc_msg_memory_exhausted;
}
if (groupname != NULL && error_msg == NULL)
free (*username_arg);
*username_arg = NULL;
}
- error_msg = tired;
+ error_msg = xalloc_msg_memory_exhausted;
}
}
}
- return error_msg;
+ if (error_msg && maybe_retry)
+ {
+ maybe_retry = 0;
+ separator = dot;
+ error_msg = NULL;
+ goto retry;
+ }
+
+ return _(error_msg);
}
#ifdef TEST
projects / gnulib.git / blobdiff