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https://gitlab.com/apparmor/apparmor.git
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c0b5035b1a
The apparmor_parser has 3 different directory walking routines. Abstract them out and use a single common routine. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-By: Steve Beattie <sbeattie@ubuntu.com>
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* Copyright (c) 2012
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* Canonical Ltd. (All rights reserved)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, contact Novell, Inc. or Canonical,
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* Ltd.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define _(s) gettext(s)
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "parser.h"
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/**
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* dirat_for_each: iterate over a directory calling cb for each entry
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* @dir: already opened directory (MAY BE NULL)
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* @name: name of the directory (MAY BE NULL)
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* @data: data pointer to pass to the callback fn (MAY BE NULL)
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* @cb: the callback to pass entry too (NOT NULL)
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*
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* Iterate over the entries in a directory calling cb for each entry.
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* The directory to iterate is determined by a combination of @dir and
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* @name.
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*
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* IF @name is a relative path it is determine relative to at @dir if it
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* is specified, else it the lookup is done relative to the current
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* working directory.
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*
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* If @name is not specified then @dir is used as the directory to iterate
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* over.
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*
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* It is an error if both @name and @dir are null
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*
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* The cb function is called with the DIR in use and the name of the
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* file in that directory. If the file is to be opened it should
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* use the openat, fstatat, and related fns.
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*
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* Returns: 0 on success, else -1 and errno is set to the error code
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*/
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int dirat_for_each(DIR *dir, const char *name, void *data,
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int (* cb)(DIR *, const char *, struct stat *, void *))
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{
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struct dirent *dirent = NULL, *ent;
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DIR *d = NULL;
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int error = 0;
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if (!cb || (!dir && !name)) {
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errno = EINVAL;
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return -1;
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}
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if (dir && (!name || *name != '/')) {
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dirent = malloc(offsetof(struct dirent, d_name) +
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fpathconf(dirfd(dir), _PC_NAME_MAX) + 1);
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} else {
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dirent = malloc(offsetof(struct dirent, d_name) +
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pathconf(name, _PC_NAME_MAX) + 1);
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}
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if (!dirent) {
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PDEBUG("could not alloc dirent");
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return -1;
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}
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if (name) {
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if (dir && *name != '/') {
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int fd = openat(dirfd(dir), name, O_RDONLY);
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if (fd == -1)
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goto fail;
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d = fdopendir(fd);
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} else {
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d = opendir(name);
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}
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PDEBUG("Open dir '%s': %s\n", name, d ? "succeeded" : "failed");
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if (!(d))
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goto fail;
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} else { /* dir && !name */
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PDEBUG("Recieved cache directory\n");
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d = dir;
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}
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for (error = readdir_r(d, dirent, &ent);
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error == 0 && ent != NULL;
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error = readdir_r(d, dirent, &ent)) {
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struct stat my_stat;
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if (strcmp(ent->d_name, ".") == 0 ||
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strcmp(ent->d_name, "..") == 0)
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continue;
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if (fstatat(dirfd(d), ent->d_name, &my_stat, 0)) {
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PDEBUG("stat failed for '%s'", name);
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goto fail;
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}
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if (cb(d, ent->d_name, &my_stat, data)) {
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PDEBUG("dir_for_each callback failed\n");
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goto fail;
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}
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}
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if (d != dir)
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closedir(d);
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free(dirent);
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return error;
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fail:
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error = errno;
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if (d && d != dir)
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closedir(d);
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free(dirent);
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errno = error;
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return -1;
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}
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