+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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 the Free
- * Software Foundation; only version 2 of the License.
- *
- * This program 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 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., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_SOURCE
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
-
-#include <lttngerr.h>
-
-#include "utils.h"
-
-struct mkdir_data {
- const char *path;
- mode_t mode;
-};
-
-struct open_data {
- const char *path;
- int flags;
- mode_t mode;
-};
-
-/*
- * Write to writable pipe used to notify a thread.
- */
-int notify_thread_pipe(int wpipe)
-{
- int ret;
-
- ret = write(wpipe, "!", 1);
- if (ret < 0) {
- PERROR("write poll pipe");
- }
-
- return ret;
-}
-
-/*
- * Return pointer to home directory path using the env variable HOME.
- *
- * No home, NULL is returned.
- */
-const char *get_home_dir(void)
-{
- return ((const char *) getenv("HOME"));
-}
-
-/*
- * Create recursively directory using the FULL path.
- */
-static
-int _mkdir_recursive(void *_data)
-{
- struct mkdir_data *data = _data;
- const char *path;
- char *p, tmp[PATH_MAX];
- struct stat statbuf;
- mode_t mode;
- size_t len;
- int ret;
-
- path = data->path;
- mode = data->mode;
-
- ret = snprintf(tmp, sizeof(tmp), "%s", path);
- if (ret < 0) {
- PERROR("snprintf mkdir");
- goto error;
- }
-
- len = ret;
- if (tmp[len - 1] == '/') {
- tmp[len - 1] = 0;
- }
-
- for (p = tmp + 1; *p; p++) {
- if (*p == '/') {
- *p = 0;
- ret = stat(tmp, &statbuf);
- if (ret < 0) {
- ret = mkdir(tmp, mode);
- if (ret < 0) {
- if (!(errno == EEXIST)) {
- PERROR("mkdir recursive");
- ret = -errno;
- goto error;
- }
- }
- }
- *p = '/';
- }
- }
-
- ret = mkdir(tmp, mode);
- if (ret < 0) {
- if (!(errno == EEXIST)) {
- PERROR("mkdir recursive last piece");
- ret = -errno;
- } else {
- ret = 0;
- }
- }
-
-error:
- return ret;
-}
-
-static
-int _mkdir(void *_data)
-{
- struct mkdir_data *data = _data;
- return mkdir(data->path, data->mode);
-}
-
-static
-int _open(void *_data)
-{
- struct open_data *data = _data;
- return open(data->path, data->flags, data->mode);
-}
-
-static
-int run_as(int (*cmd)(void *data), void *data, uid_t uid, gid_t gid)
-{
- int ret = 0;
- pid_t pid;
-
- /*
- * If we are non-root, we can only deal with our own uid.
- */
- if (geteuid() != 0) {
- if (uid != geteuid()) {
- ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
- uid, geteuid());
- return -EPERM;
- }
- return (*cmd)(data);
- }
-
- pid = fork();
- if (pid > 0) {
- int status;
-
- /*
- * Parent: wait for child to return, in which case the
- * shared memory map will have been created.
- */
- pid = wait(&status);
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- ret = -1;
- goto end;
- }
- goto end;
- } else if (pid == 0) {
- /* Child */
- setegid(gid);
- if (ret < 0) {
- perror("setegid");
- exit(EXIT_FAILURE);
- }
- ret = seteuid(uid);
- if (ret < 0) {
- perror("seteuid");
- exit(EXIT_FAILURE);
- }
- umask(0);
- ret = (*cmd)(data);
- if (!ret)
- exit(EXIT_SUCCESS);
- else
- exit(EXIT_FAILURE);
- } else {
- return -1;
- }
-end:
- return ret;
-}
-
-int mkdir_recursive_run_as(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
- struct mkdir_data data;
-
- DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d",
- path, mode, uid, gid);
- data.path = path;
- data.mode = mode;
- return run_as(_mkdir_recursive, &data, uid, gid);
-}
-
-int mkdir_run_as(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
- struct mkdir_data data;
-
- DBG3("mkdir() %s with mode %d for uid %d and gid %d",
- path, mode, uid, gid);
- data.path = path;
- data.mode = mode;
- return run_as(_mkdir, &data, uid, gid);
-}
-
-int open_run_as(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid)
-{
- struct open_data data;
-
- DBG3("open() %s with flags %d mode %d for uid %d and gid %d",
- path, flags, mode, uid, gid);
- data.path = path;
- data.flags = flags;
- data.mode = mode;
- return run_as(_open, &data, uid, gid);
-}