mirror of https://github.com/BOINC/boinc.git
241 lines
6.8 KiB
C++
241 lines
6.8 KiB
C++
// This file is part of BOINC.
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// http://boinc.berkeley.edu
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// Copyright (C) 2008 University of California
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//
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// BOINC is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// BOINC 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.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
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#include "cpp.h"
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#ifdef _WIN32
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#include "boinc_win.h"
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#else
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#include "config.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <grp.h>
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#include <errno.h>
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#endif
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#include "error_numbers.h"
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#include "file_names.h"
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#include "util.h"
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#include "str_util.h"
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#include "str_replace.h"
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#include "filesys.h"
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#include "parse.h"
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#include "client_msgs.h"
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#include "client_state.h"
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#include "sandbox.h"
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bool g_use_sandbox = false;
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#ifndef _WIN32
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#ifndef _DEBUG
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static int lookup_group(const char* name, gid_t& gid) {
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struct group* gp = getgrnam(name);
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if (!gp) return ERR_GETGRNAM;
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gid = gp->gr_gid;
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return 0;
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}
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#endif
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void kill_via_switcher(int pid) {
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char cmd[1024];
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if (!g_use_sandbox) return;
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// if project application is running as user boinc_project and
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// client is running as user boinc_master,
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// we cannot send a signal directly, so use switcher.
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//
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sprintf(cmd, "/bin/kill kill -s KILL %d", pid);
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switcher_exec(SWITCHER_FILE_NAME, cmd);
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}
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int get_project_gid() {
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if (g_use_sandbox) {
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#ifdef _DEBUG
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gstate.boinc_project_gid = getegid();
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#else
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return lookup_group(BOINC_PROJECT_GROUP_NAME, gstate.boinc_project_gid);
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#endif // _DEBUG
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} else {
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gstate.boinc_project_gid = 0;
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}
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return 0;
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}
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int set_to_project_group(const char* path) {
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if (g_use_sandbox) {
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if (switcher_exec(SETPROJECTGRP_FILE_NAME, path)) {
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return ERR_CHOWN;
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}
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}
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return 0;
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}
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// POSIX requires that shells run from an application will use the
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// real UID and GID if different from the effective UID and GID.
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// Mac OS 10.4 did not enforce this, but OS 10.5 does. Since
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// system() invokes a shell, we can't use it to run the switcher
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// or setprojectgrp utilities, so we must do a fork() and execv().
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//
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int switcher_exec(const char *util_filename, const char* cmdline) {
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char* argv[100];
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char util_path[MAXPATHLEN];
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sprintf(util_path, "%s/%s", SWITCHER_DIR, util_filename);
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argv[0] = const_cast<char*>(util_filename);
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parse_command_line(const_cast<char*>(cmdline), argv+1);
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int pid = fork();
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if (pid == -1) {
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perror("fork() failed in switcher_exec");
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return ERR_FORK;
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}
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if (pid == 0) {
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// This is the new (forked) process
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execv(util_path, argv);
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fprintf(stderr, "execv failed in switcher_exec(%s, %s): %s", util_path, cmdline, strerror(errno));
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return ERR_EXEC;
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}
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// Wait for command to complete, like system() does.
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waitpid(pid, 0, 0);
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return BOINC_SUCCESS;
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}
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int remove_project_owned_file_or_dir(const char* path) {
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char cmd[1024];
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if (g_use_sandbox) {
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sprintf(cmd, "/bin/rm rm -fR \"%s\"", path);
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if (switcher_exec(SWITCHER_FILE_NAME, cmd)) {
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return ERR_UNLINK;
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} else {
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return 0;
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}
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}
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return ERR_UNLINK;
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}
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#endif // ! _WIN32
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static int delete_project_owned_file_aux(const char* path) {
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#ifdef _WIN32
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if (DeleteFile(path)) return 0;
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int error = GetLastError();
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if (error == ERROR_ACCESS_DENIED) {
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SetFileAttributes(path, FILE_ATTRIBUTE_NORMAL);
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if (DeleteFile(path)) return 0;
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}
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return ERR_UNLINK;
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#else
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int retval = unlink(path);
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if (retval && g_use_sandbox && (errno == EACCES)) {
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// We may not have permission to read subdirectories created by projects
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return remove_project_owned_file_or_dir(path);
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}
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return retval;
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#endif
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}
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// Delete the file located at path.
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// If "retry" is set, do retries for 5 sec in case some
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// other program (e.g. virus checker) has the file locked.
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// Don't do this if deleting directories - it can lock up the Manager.
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//
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int delete_project_owned_file(const char* path, bool retry) {
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int retval = 0;
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if (!boinc_file_or_symlink_exists(path)) {
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return 0;
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}
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retval = delete_project_owned_file_aux(path);
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if (retval && retry) {
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double start = dtime();
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do {
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boinc_sleep(drand()*2); // avoid lockstep
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retval = delete_project_owned_file_aux(path);
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if (!retval) break;
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} while (dtime() < start + FILE_RETRY_INTERVAL);
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}
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if (retval) {
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safe_strcpy(boinc_failed_file, path);
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return ERR_UNLINK;
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}
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if (log_flags.slot_debug) {
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msg_printf(0, MSG_INFO, "[slot] removed file %s", path);
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}
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return 0;
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}
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// recursively delete everything in the specified directory
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// (but not the directory itself).
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// If an error occurs, delete as much as possible.
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//
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int client_clean_out_dir(const char* dirpath, const char* reason) {
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char filename[256], path[MAXPATHLEN];
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int retval, final_retval = 0;
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DIRREF dirp;
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if (reason && log_flags.slot_debug) {
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msg_printf(0, MSG_INFO, "[slot] cleaning out %s: %s", dirpath, reason);
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}
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dirp = dir_open(dirpath);
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if (!dirp) {
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#ifndef _WIN32
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if (g_use_sandbox && (errno == EACCES)) {
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// dir may be owned by boinc_apps
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return remove_project_owned_file_or_dir(dirpath);
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}
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#endif
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return 0; // if dir doesn't exist, it's empty
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}
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while (1) {
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strcpy(filename, "");
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retval = dir_scan(filename, dirp, sizeof(filename));
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if (retval) break;
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sprintf(path, "%s/%s", dirpath, filename);
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if (is_dir(path)) {
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retval = client_clean_out_dir(path, NULL);
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if (retval) final_retval = retval;
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retval = remove_project_owned_dir(path);
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if (retval) final_retval = retval;
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} else {
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retval = delete_project_owned_file(path, false);
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if (retval) final_retval = retval;
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}
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}
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dir_close(dirp);
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return final_retval;
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}
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int remove_project_owned_dir(const char* name) {
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#ifdef _WIN32
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if (!RemoveDirectory(name)) {
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return GetLastError();
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}
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return 0;
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#else
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int retval;
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retval = rmdir(name);
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// We may not have permission to read subdirectories created by projects
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if (retval && g_use_sandbox && (errno == EACCES)) {
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retval = remove_project_owned_file_or_dir(name);
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}
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return retval;
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#endif
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}
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