/* Copyright (C) 1992-2015 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <hurd.h> #include <hurd/lookup.h> #include <string.h> #include <fcntl.h> /* Translate the error from dir_lookup into the error the user sees. */ static inline error_t lookup_error (error_t error) { switch (error) { case EOPNOTSUPP: case MIG_BAD_ID: /* These indicate that the server does not understand dir_lookup at all. If it were a directory, it would, by definition. */ return ENOTDIR; default: return error; } } error_t __hurd_file_name_lookup (error_t (*use_init_port) (int which, error_t (*operate) (file_t)), file_t (*get_dtable_port) (int fd), error_t (*lookup) (file_t dir, char *name, int flags, mode_t mode, retry_type *do_retry, string_t retry_name, mach_port_t *result), const char *file_name, int flags, mode_t mode, file_t *result) { error_t err; enum retry_type doretry; char retryname[1024]; /* XXX string_t LOSES! */ int startport; error_t lookup_op (mach_port_t startdir) { return lookup_error ((*lookup) (startdir, file_name, flags, mode, &doretry, retryname, result)); } if (! lookup) lookup = __dir_lookup; if (file_name[0] == '\0') return ENOENT; startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR; while (file_name[0] == '/') file_name++; if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */ flags |= O_NOTRANS; if (flags & O_DIRECTORY) { /* The caller wants to require that the file we look up is a directory. We can do this without an extra RPC by appending a trailing slash to the file name we look up. */ size_t len = strlen (file_name); if (len == 0) file_name = "/"; else if (file_name[len - 1] != '/') { char *n = alloca (len + 2); memcpy (n, file_name, len); n[len] = '/'; n[len + 1] = '\0'; file_name = n; } } err = (*use_init_port) (startport, &lookup_op); if (! err) err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port, lookup, doretry, retryname, flags, mode, result); return err; } weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup) error_t __hurd_file_name_split (error_t (*use_init_port) (int which, error_t (*operate) (file_t)), file_t (*get_dtable_port) (int fd), error_t (*lookup) (file_t dir, char *name, int flags, mode_t mode, retry_type *do_retry, string_t retry_name, mach_port_t *result), const char *file_name, file_t *dir, char **name) { error_t addref (file_t crdir) { *dir = crdir; return __mach_port_mod_refs (__mach_task_self (), crdir, MACH_PORT_RIGHT_SEND, +1); } const char *lastslash = strrchr (file_name, '/'); if (lastslash != NULL) { if (lastslash == file_name) { /* "/foobar" => crdir + "foobar". */ *name = (char *) file_name + 1; return (*use_init_port) (INIT_PORT_CRDIR, &addref); } else { /* "/dir1/dir2/.../file". */ char dirname[lastslash - file_name + 1]; memcpy (dirname, file_name, lastslash - file_name); dirname[lastslash - file_name] = '\0'; *name = (char *) lastslash + 1; return __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, dirname, 0, 0, dir); } } else if (file_name[0] == '\0') return ENOENT; else { /* "foobar" => cwdir + "foobar". */ *name = (char *) file_name; return (*use_init_port) (INIT_PORT_CWDIR, &addref); } } weak_alias (__hurd_file_name_split, hurd_file_name_split) /* This is the same as hurd_file_name_split, except that it ignores trailing slashes (so *NAME is never ""). */ error_t __hurd_directory_name_split (error_t (*use_init_port) (int which, error_t (*operate) (file_t)), file_t (*get_dtable_port) (int fd), error_t (*lookup) (file_t dir, char *name, int flags, mode_t mode, retry_type *do_retry, string_t retry_name, mach_port_t *result), const char *file_name, file_t *dir, char **name) { error_t addref (file_t crdir) { *dir = crdir; return __mach_port_mod_refs (__mach_task_self (), crdir, MACH_PORT_RIGHT_SEND, +1); } const char *lastslash = strrchr (file_name, '/'); if (lastslash != NULL && lastslash[1] == '\0') { /* Trailing slash doesn't count. Look back further. */ /* Back up over all trailing slashes. */ while (lastslash > file_name && *lastslash == '/') --lastslash; /* Find the last one earlier in the string, before the trailing ones. */ lastslash = __memrchr (file_name, '/', lastslash - file_name); } if (lastslash != NULL) { if (lastslash == file_name) { /* "/foobar" => crdir + "foobar". */ *name = (char *) file_name + 1; return (*use_init_port) (INIT_PORT_CRDIR, &addref); } else { /* "/dir1/dir2/.../file". */ char dirname[lastslash - file_name + 1]; memcpy (dirname, file_name, lastslash - file_name); dirname[lastslash - file_name] = '\0'; *name = (char *) lastslash + 1; return __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, dirname, 0, 0, dir); } } else if (file_name[0] == '\0') return ENOENT; else { /* "foobar" => cwdir + "foobar". */ *name = (char *) file_name; return (*use_init_port) (INIT_PORT_CWDIR, &addref); } } weak_alias (__hurd_directory_name_split, hurd_directory_name_split) file_t __file_name_lookup (const char *file_name, int flags, mode_t mode) { error_t err; file_t result; err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0, file_name, flags, mode & ~_hurd_umask, &result); return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; } weak_alias (__file_name_lookup, file_name_lookup) file_t __file_name_split (const char *file_name, char **name) { error_t err; file_t result; err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0, file_name, &result, name); return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; } weak_alias (__file_name_split, file_name_split) file_t __directory_name_split (const char *directory_name, char **name) { error_t err; file_t result; err = __hurd_directory_name_split (&_hurd_ports_use, &__getdport, 0, directory_name, &result, name); return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; } weak_alias (__directory_name_split, directory_name_split) file_t __file_name_lookup_under (file_t startdir, const char *file_name, int flags, mode_t mode) { error_t err; file_t result; error_t use_init_port (int which, error_t (*operate) (mach_port_t)) { return (which == INIT_PORT_CWDIR ? (*operate) (startdir) : _hurd_ports_use (which, operate)); } err = __hurd_file_name_lookup (&use_init_port, &__getdport, 0, file_name, flags, mode & ~_hurd_umask, &result); return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; } weak_alias (__file_name_lookup_under, file_name_lookup_under)