maint: update copyright

[gnulib.git] / lib / userspec.c

diff --git a/lib/userspec.c b/lib/userspec.c
index fc93267..1be9266 100644 (file)
--- a/lib/userspec.c
+++ b/lib/userspec.c
@@ -1,10 +1,11 @@
 /* userspec.c -- Parse a user and group string.
 /* userspec.c -- Parse a user and group string.

-   Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
+   Copyright (C) 1989-1992, 1997-1998, 2000, 2002-2014 Free Software
+   Foundation, Inc.

 
 

-   This program is free software; you can redistribute it and/or modify
+   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
    it under the terms of the GNU General Public License as published by

-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.

 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of


@@ -12,180 +13,309 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License

-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
 
 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */

-\f
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
-   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
-   (which it would do because it found this file in $srcdir).  */
+

 #include <config.h>
 #include <config.h>

-#else
-#include "config.h"
-#endif
-#endif

 
 

+/* Specification.  */
+#include "userspec.h"
+
+#include <stdbool.h>

 #include <stdio.h>
 #include <sys/types.h>
 #include <pwd.h>
 #include <grp.h>
 
 #include <stdio.h>
 #include <sys/types.h>
 #include <pwd.h>
 #include <grp.h>
 

-#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+
+#include <limits.h>
+#include <stdlib.h>

 #include <string.h>
 #include <string.h>

-#ifndef index
-#define index strchr
+
+#include <unistd.h>
+
+#include "intprops.h"
+#include "inttostr.h"
+#include "xalloc.h"
+#include "xstrtol.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+#define N_(msgid) msgid
+
+#ifndef HAVE_ENDGRENT
+# define endgrent() ((void) 0)

 #endif
 #endif

-#else
-#include <strings.h>
+
+#ifndef HAVE_ENDPWENT
+# define endpwent() ((void) 0)

 #endif
 
 #endif
 

-#ifdef STDC_HEADERS
-#include <stdlib.h>
-#else
-char *malloc ();
+#ifndef UID_T_MAX
+# define UID_T_MAX TYPE_MAXIMUM (uid_t)

 #endif
 
 #endif
 

-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+#ifndef GID_T_MAX
+# define GID_T_MAX TYPE_MAXIMUM (gid_t)

 #endif
 
 #endif
 

-#ifndef _POSIX_VERSION
-struct passwd *getpwnam ();
-struct group *getgrnam ();
-struct group *getgrgid ();
+/* MAXUID may come from limits.h or sys/params.h.  */
+#ifndef MAXUID
+# define MAXUID UID_T_MAX

 #endif
 #endif

+#ifndef MAXGID
+# define MAXGID GID_T_MAX
+#endif
+
+#ifdef __DJGPP__

 
 

-#ifdef _POSIX_SOURCE
-#define endpwent()
-#define endgrent()
+/* ISDIGIT differs from isdigit, as follows:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char
+     or EOF.
+   - It's typically faster.
+   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
+   isdigit 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 int) (c) - '0' <= 9)
+
+/* Return true if STR represents an unsigned decimal integer.  */
+
+static bool
+is_number (const char *str)
+{
+  do
+    {
+      if (!ISDIGIT (*str))
+        return false;
+    }
+  while (*++str);
+
+  return true;
+}

 #endif
 
 #endif
 

-#define isdigit(c) ((c) >= '0' && (c) <= '9')
+static char const *
+parse_with_separator (char const *spec, char const *separator,
+                      uid_t *uid, gid_t *gid,
+                      char **username, char **groupname)
+{
+  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_("invalid spec");

 
 

-char *strdup ();
-static int isnumber ();
+  const char *error_msg;
+  struct passwd *pwd;
+  struct group *grp;
+  char *u;
+  char const *g;
+  char *gname = NULL;
+  uid_t unum = *uid;
+  gid_t gnum = gid ? *gid : -1;
+
+  error_msg = NULL;
+  if (username)
+    *username = NULL;
+  if (groupname)
+    *groupname = NULL;

 
 

-/* Extract from NAME, which has the form "[user][:.][group]",
+  /* Set U and G to nonzero length strings corresponding to user and
+     group specifiers or to NULL.  If U is not NULL, it is a newly
+     allocated string.  */
+
+  u = NULL;
+  if (separator == NULL)
+    {
+      if (*spec)
+        u = xstrdup (spec);
+    }
+  else
+    {
+      size_t ulen = separator - spec;
+      if (ulen != 0)
+        {
+          u = xmemdup (spec, ulen + 1);
+          u[ulen] = '\0';
+        }
+    }
+
+  g = (separator == NULL || *(separator + 1) == '\0'
+       ? NULL
+       : separator + 1);
+
+#ifdef __DJGPP__
+  /* Pretend that we are the user U whose group is G.  This makes
+     pwd and grp functions "know" about the UID and GID of these.  */
+  if (u && !is_number (u))
+    setenv ("USER", u, 1);
+  if (g && !is_number (g))
+    setenv ("GROUP", g, 1);
+#endif
+
+  if (u != NULL)
+    {
+      /* If it starts with "+", skip the look-up.  */
+      pwd = (*u == '+' ? NULL : getpwnam (u));
+      if (pwd == NULL)
+        {
+          bool use_login_group = (separator != NULL && g == NULL);
+          if (use_login_group)
+            {
+              /* If there is no group,
+                 then there may not be a trailing ":", either.  */
+              error_msg = E_bad_spec;
+            }
+          else
+            {
+              unsigned long int tmp;
+              if (xstrtoul (u, NULL, 10, &tmp, "") == LONGINT_OK
+                  && tmp <= MAXUID && (uid_t) tmp != (uid_t) -1)
+                unum = tmp;
+              else
+                error_msg = E_invalid_user;
+            }
+        }
+      else
+        {
+          unum = pwd->pw_uid;
+          if (g == NULL && separator != NULL)
+            {
+              /* A separator was given, but a group was not specified,
+                 so get the login group.  */
+              char buf[INT_BUFSIZE_BOUND (uintmax_t)];
+              gnum = pwd->pw_gid;
+              grp = getgrgid (gnum);
+              gname = xstrdup (grp ? grp->gr_name : umaxtostr (gnum, buf));
+              endgrent ();
+            }
+        }
+      endpwent ();
+    }
+
+  if (g != NULL && error_msg == NULL)
+    {
+      /* Explicit group.  */
+      /* If it starts with "+", skip the look-up.  */
+      grp = (*g == '+' ? NULL : getgrnam (g));
+      if (grp == NULL)
+        {
+          unsigned long int tmp;
+          if (xstrtoul (g, NULL, 10, &tmp, "") == LONGINT_OK
+              && tmp <= MAXGID && (gid_t) tmp != (gid_t) -1)
+            gnum = tmp;
+          else
+            error_msg = E_invalid_group;
+        }
+      else
+        gnum = grp->gr_gid;
+      endgrent ();              /* Save a file descriptor.  */
+      gname = xstrdup (g);
+    }
+
+  if (error_msg == NULL)
+    {
+      *uid = unum;
+      if (gid)
+        *gid = gnum;
+      if (username)
+        {
+          *username = u;
+          u = NULL;
+        }
+      if (groupname)
+        {
+          *groupname = gname;
+          gname = NULL;
+        }
+    }
+
+  free (u);
+  free (gname);
+  return _(error_msg);
+}
+
+/* Extract from SPEC, which has the form "[user][:.][group]",

    a USERNAME, UID U, GROUPNAME, and GID G.
    a USERNAME, UID U, GROUPNAME, and GID G.

+   If the GID parameter is NULL the entire SPEC is treated as a user.
+   If the USERNAME and GROUPNAME parameters are NULL they're ignored.

    Either user or group, or both, must be present.
    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.
    use the given user's login group.

+   If SPEC 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 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
    given and the corresponding numeric ID was left unchanged.
 
    USERNAME and GROUPNAME will be in newly malloc'd memory.
    Either one might be NULL instead, indicating that it was not
    given and the corresponding numeric ID was left unchanged.

-   Might write NULs into NAME.

 
    Return NULL if successful, a static error message string if not.  */
 
 
    Return NULL if successful, a static error message string if not.  */
 

-char *
-parse_user_spec (name, uid, gid, username, groupname)
-     char *name;
-     uid_t *uid;
-     gid_t *gid;
-     char **username, **groupname;
+char const *
+parse_user_spec (char const *spec, uid_t *uid, gid_t *gid,
+                 char **username, char **groupname)

 {
 {

-  static char *tired = "virtual memory exhausted";
-  struct passwd *pwd;
-  struct group *grp;
-  char *cp;
-  int use_login_group = 0;
+  char const *colon = gid ? strchr (spec, ':') : NULL;
+  char const *error_msg =
+    parse_with_separator (spec, colon, uid, gid, username, groupname);

 
 

-  *username = *groupname = NULL;
-
-  /* Check whether a group is given.  */
-  cp = index (name, ':');
-  if (cp == NULL)
-    cp = index (name, '.');
-  if (cp != NULL)
+  if (gid && !colon && error_msg)

     {
     {

-      *cp++ = '\0';
-      if (*cp == '\0')
-       {
-         if (cp == name + 1)
-           /* Neither user nor group given, just "." or ":".  */
-           return "can not omit both user and group";
-         else
-           /* "user.".  */
-           use_login_group = 1;
-       }
-      else
-       {
-         /* Explicit group.  */
-         *groupname = strdup (cp);
-         if (*groupname == NULL)
-           return tired;
-         grp = getgrnam (cp);
-         if (grp == NULL)
-           {
-             if (!isnumber (cp))
-               return "invalid group";
-             *gid = atoi (cp);
-           }
-         else
-           *gid = grp->gr_gid;
-         endgrent ();          /* Save a file descriptor.  */
-       }
+      /* If there's no colon but there is a dot, and if looking up the
+         whole spec failed (i.e., the spec is not an owner name that
+         includes a dot), then try again, but interpret the dot as a
+         separator.  This is a compatible extension to POSIX, since
+         the POSIX-required behavior is always tried first.  */
+
+      char const *dot = strchr (spec, '.');
+      if (dot
+          && ! parse_with_separator (spec, dot, uid, gid, username, groupname))
+        error_msg = NULL;

     }
 
     }
 

-  /* Parse the user name, now that any group has been removed.  */
+  return error_msg;
+}

 
 

-  if (name[0] == '\0')
-    /* No user name was given, just a group.  */
-    return NULL;
+#ifdef TEST

 
 

-  *username = strdup (name);
-  if (*username == NULL)
-    return tired;
+# define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s))

 
 

-  pwd = getpwnam (name);
-  if (pwd == NULL)
-    {
-      if (!isnumber (name))
-       return "invalid user";
-      if (use_login_group)
-       return "cannot get the login group of a numeric UID";
-      *uid = atoi (name);
-    }
-  else
+int
+main (int argc, char **argv)
+{
+  int i;
+
+  for (i = 1; i < argc; i++)

     {
     {

-      *uid = pwd->pw_uid;
-      if (use_login_group)
-       {
-         *gid = pwd->pw_gid;
-         grp = getgrgid (pwd->pw_gid);
-         if (grp == NULL)
-           {
-             *groupname = malloc (15);
-             if (*groupname == NULL)
-               return tired;
-             sprintf (*groupname, "%u", pwd->pw_gid);
-           }
-         else
-           {
-             *groupname = strdup (grp->gr_name);
-             if (*groupname == NULL)
-               return tired;
-           }
-         endgrent ();
-       }
+      const char *e;
+      char *username, *groupname;
+      uid_t uid;
+      gid_t gid;
+      char *tmp;
+
+      tmp = strdup (argv[i]);
+      e = parse_user_spec (tmp, &uid, &gid, &username, &groupname);
+      free (tmp);
+      printf ("%s: %lu %lu %s %s %s\n",
+              argv[i],
+              (unsigned long int) uid,
+              (unsigned long int) gid,
+              NULL_CHECK (username),
+              NULL_CHECK (groupname),
+              NULL_CHECK (e));

     }
     }

-  endpwent ();
-  return NULL;
+
+  exit (0);

 }
 
 }
 

-/* Return nonzero if STR represents an unsigned decimal integer,
-   otherwise return 0. */
+#endif

 
 

-static int
-isnumber (str)
-     char *str;
-{
-  for (; *str; str++)
-    if (!isdigit (*str))
-      return 0;
-  return 1;
-}
+/*
+Local Variables:
+indent-tabs-mode: nil
+End:
+*/