X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fuserspec.c;h=1d3df6e442c60d5e62682a43819fe520c64866d2;hb=7518b4fbb51d5c858aa79f9e9eef676258efde23;hp=6de8b824d055cb783a1cde4457a8506ccc1ce96a;hpb=5a84bc4587b2b38448098dd7f69843a83ecd24dc;p=gnulib.git diff --git a/lib/userspec.c b/lib/userspec.c index 6de8b824d..1d3df6e44 100644 --- a/lib/userspec.c +++ b/lib/userspec.c @@ -1,5 +1,5 @@ /* 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 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 @@ -12,20 +12,27 @@ 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, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Written by David MacKenzie . */ - -#ifdef HAVE_CONFIG_H -#if defined (CONFIG_BROKETS) -/* We use 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 -#else -#include "config.h" + +#if HAVE_CONFIG_H +# include #endif + +#ifdef __GNUC__ +# define alloca __builtin_alloca +#else +# if HAVE_ALLOCA_H +# include +# else +# ifdef _AIX + # pragma alloca +# else +char *alloca (); +# endif +# endif #endif #include @@ -33,22 +40,41 @@ #include #include -#if defined(STDC_HEADERS) || defined(HAVE_STRING_H) -#include -#ifndef index -#define index strchr +#if HAVE_SYS_PARAM_H +# include +#endif + +#if HAVE_LIMITS_H +# include #endif + +#if HAVE_STRING_H +# include #else -#include +# include +# ifndef strchr +# define strchr index +# endif +#endif + +#if STDC_HEADERS +# include #endif -#ifdef STDC_HEADERS -#include +#if HAVE_UNISTD_H +# include #endif -#ifdef HAVE_UNISTD_H -#include +#include "xalloc.h" +#include "xstrtol.h" + +#if ENABLE_NLS +# include +# define _(Text) gettext (Text) +#else +# define _(Text) Text #endif +#define N_(Text) Text #ifndef _POSIX_VERSION struct passwd *getpwnam (); @@ -56,24 +82,75 @@ struct group *getgrnam (); struct group *getgrgid (); #endif -#ifdef _POSIX_SOURCE -#define endpwent() -#define endgrent() +#ifndef HAVE_ENDGRENT +# define endgrent() ((void) 0) +#endif + +#ifndef HAVE_ENDPWENT +# define endpwent() ((void) 0) +#endif + +#ifndef CHAR_BIT +# define CHAR_BIT 8 +#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 -#define isdigit(c) ((c) >= '0' && (c) <= '9') +/* 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. */ + +#define V_STRDUP(dest, src) \ + do \ + { \ + int _len = strlen ((src)); \ + (dest) = (char *) alloca (_len + 1); \ + strcpy (dest, src); \ + } \ + while (0) + +/* 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) + +#ifndef strdup char *strdup (); +#endif /* Return nonzero if STR represents an unsigned decimal integer, otherwise return 0. */ static int -isnumber (str) - const char *str; +is_number (const char *str) { for (; *str; str++) - if (!isdigit (*str)) + if (!ISDIGIT (*str)) return 0; return 1; } @@ -81,8 +158,12 @@ isnumber (str) /* 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 @@ -91,31 +172,49 @@ isnumber (str) Return NULL if successful, a static error message string if not. */ const char * -parse_user_spec (spec_arg, uid, gid, username, groupname) - const char *spec_arg; - uid_t *uid; - gid_t *gid; - char **username, **groupname; +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. */ - int spec_len; struct passwd *pwd; struct group *grp; char *g, *u, *separator; + char *groupname; + int maybe_retry = 0; + char *dot = NULL; error_msg = NULL; - *username = *groupname = NULL; + *username_arg = *groupname_arg = NULL; + groupname = NULL; - spec_len = strlen (spec_arg); - spec = (char *) alloca (strlen (spec_arg) + 1); - strcpy (spec, spec_arg); + V_STRDUP (spec, spec_arg); - /* Find the separator if there is one. */ - separator = index (spec, ':'); + /* Find the POSIX `:' separator if there is one. */ + separator = strchr (spec, ':'); + + /* If there is no colon, then see if there's a `.'. */ if (separator == NULL) - separator = index (spec, '.'); + { + 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) @@ -130,7 +229,16 @@ parse_user_spec (spec_arg, uid, gid, username, groupname) : 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 + 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) { @@ -138,16 +246,22 @@ parse_user_spec (spec_arg, uid, gid, username, groupname) if (pwd == NULL) { - if (!isnumber (u)) - error_msg = "invalid user"; + if (!is_number (u)) + 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 @@ -166,25 +280,16 @@ parse_user_spec (spec_arg, uid, gid, username, groupname) zero byte. */ char uint_buf[21]; sprintf (uint_buf, "%u", (unsigned) (pwd->pw_gid)); - *groupname = strdup (uint_buf); + V_STRDUP (groupname, uint_buf); } else { - *groupname = strdup (grp->gr_name); + V_STRDUP (groupname, grp->gr_name); } - if (*groupname == NULL) - error_msg = tired; endgrent (); } } endpwent (); - - if (error_msg == NULL) - { - *username = strdup (u); - if (*username == NULL) - error_msg = tired; - } } if (g != NULL && error_msg == NULL) @@ -193,43 +298,63 @@ parse_user_spec (spec_arg, uid, gid, username, groupname) grp = getgrnam (g); if (grp == NULL) { - if (!isnumber (g)) - error_msg = "invalid group"; + if (!is_number (g)) + 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; endgrent (); /* Save a file descriptor. */ if (error_msg == NULL) - { - *groupname = strdup (g); - if (*groupname == NULL) - error_msg = tired; - } + V_STRDUP (groupname, g); } - if (error_msg) + if (error_msg == NULL) { - if (*groupname != NULL) + if (u != NULL) { - free (*groupname); - *groupname = NULL; + *username_arg = strdup (u); + if (*username_arg == NULL) + error_msg = xalloc_msg_memory_exhausted; } - if (*username != NULL) + + if (groupname != NULL && error_msg == NULL) { - free (*username); - *username = NULL; + *groupname_arg = strdup (groupname); + if (*groupname_arg == NULL) + { + if (*username_arg != NULL) + { + free (*username_arg); + *username_arg = NULL; + } + 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 TESTING +#ifdef TEST -#define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) +# define NULL_CHECK(s) ((s) == NULL ? "(null)" : (s)) int main (int argc, char **argv)