/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd 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.
-
- systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
typedef struct ExecStatus ExecStatus;
typedef struct ExecCommand ExecCommand;
typedef struct ExecContext ExecContext;
EXEC_OUTPUT_SOCKET,
EXEC_OUTPUT_NAMED_FD,
EXEC_OUTPUT_FILE,
+ EXEC_OUTPUT_FILE_APPEND,
_EXEC_OUTPUT_MAX,
_EXEC_OUTPUT_INVALID = -1
} ExecOutput;
_EXEC_KEYRING_MODE_INVALID = -1,
} ExecKeyringMode;
+/* Contains start and exit information about an executed command. */
struct ExecStatus {
+ pid_t pid;
dual_timestamp start_timestamp;
dual_timestamp exit_timestamp;
- pid_t pid;
int code; /* as in siginfo_t::si_code */
int status; /* as in sigingo_t::si_status */
};
typedef enum ExecCommandFlags {
- EXEC_COMMAND_IGNORE_FAILURE = 1,
- EXEC_COMMAND_FULLY_PRIVILEGED = 2,
- EXEC_COMMAND_NO_SETUID = 4,
- EXEC_COMMAND_AMBIENT_MAGIC = 8,
+ EXEC_COMMAND_IGNORE_FAILURE = 1 << 0,
+ EXEC_COMMAND_FULLY_PRIVILEGED = 1 << 1,
+ EXEC_COMMAND_NO_SETUID = 1 << 2,
+ EXEC_COMMAND_AMBIENT_MAGIC = 1 << 3,
} ExecCommandFlags;
+/* Stores information about commands we execute. Covers both configuration settings as well as runtime data. */
struct ExecCommand {
char *path;
char **argv;
LIST_FIELDS(ExecCommand, command); /* useful for chaining commands */
};
+/* Encapsulates certain aspects of the runtime environment that is to be shared between multiple otherwise separate
+ * invocations of commands. Specifically, this allows sharing of /tmp and /var/tmp data as well as network namespaces
+ * between invocations of commands. This is a reference counted object, with one reference taken by each currently
+ * active command invocation that wants to share this runtime. */
struct ExecRuntime {
int n_ref;
Manager *manager;
- /* unit id of the owner */
- char *id;
+ char *id; /* Unit id of the owner */
char *tmp_dir;
char *var_tmp_dir;
mode_t mode;
} ExecDirectory;
+/* Encodes configuration parameters applied to invoked commands. Does not carry runtime data, but only configuration
+ * changes sourced from unit files and suchlike. ExecContext objects are usually embedded into Unit objects, and do not
+ * change after being loaded. */
struct ExecContext {
char **environment;
char **environment_files;
char **read_write_paths, **read_only_paths, **inaccessible_paths;
unsigned long mount_flags;
BindMount *bind_mounts;
- unsigned n_bind_mounts;
+ size_t n_bind_mounts;
TemporaryFileSystem *temporary_filesystems;
- unsigned n_temporary_filesystems;
+ size_t n_temporary_filesystems;
uint64_t capability_bounding_set;
uint64_t capability_ambient_set;
bool private_network;
bool private_devices;
bool private_users;
+ bool private_mounts;
ProtectSystem protect_system;
ProtectHome protect_home;
bool protect_kernel_tunables;
}
typedef enum ExecFlags {
- EXEC_APPLY_SANDBOXING = 1U << 0,
- EXEC_APPLY_CHROOT = 1U << 1,
- EXEC_APPLY_TTY_STDIN = 1U << 2,
- EXEC_NEW_KEYRING = 1U << 3,
- EXEC_PASS_LOG_UNIT = 1U << 4, /* Whether to pass the unit name to the service's journal stream connection */
- EXEC_CHOWN_DIRECTORIES = 1U << 5, /* chown() the runtime/state/cache/log directories to the user we run as, under all conditions */
- EXEC_NSS_BYPASS_BUS = 1U << 6, /* Set the SYSTEMD_NSS_BYPASS_BUS environment variable, to disable nss-systemd for dbus */
- EXEC_CGROUP_DELEGATE = 1U << 7,
+ EXEC_APPLY_SANDBOXING = 1 << 0,
+ EXEC_APPLY_CHROOT = 1 << 1,
+ EXEC_APPLY_TTY_STDIN = 1 << 2,
+ EXEC_NEW_KEYRING = 1 << 3,
+ EXEC_PASS_LOG_UNIT = 1 << 4, /* Whether to pass the unit name to the service's journal stream connection */
+ EXEC_CHOWN_DIRECTORIES = 1 << 5, /* chown() the runtime/state/cache/log directories to the user we run as, under all conditions */
+ EXEC_NSS_BYPASS_BUS = 1 << 6, /* Set the SYSTEMD_NSS_BYPASS_BUS environment variable, to disable nss-systemd for dbus */
+ EXEC_CGROUP_DELEGATE = 1 << 7,
/* The following are not used by execute.c, but by consumers internally */
- EXEC_PASS_FDS = 1U << 8,
- EXEC_IS_CONTROL = 1U << 9,
- EXEC_SETENV_RESULT = 1U << 10,
- EXEC_SET_WATCHDOG = 1U << 11,
+ EXEC_PASS_FDS = 1 << 8,
+ EXEC_IS_CONTROL = 1 << 9,
+ EXEC_SETENV_RESULT = 1 << 10,
+ EXEC_SET_WATCHDOG = 1 << 11,
} ExecFlags;
+/* Parameters for a specific invocation of a command. This structure is put together right before a command is
+ * executed. */
struct ExecParameters {
- char **argv;
char **environment;
int *fds;
char **fd_names;
- unsigned n_storage_fds;
- unsigned n_socket_fds;
+ size_t n_socket_fds;
+ size_t n_storage_fds;
ExecFlags flags;
bool selinux_context_net:1;
int stdin_fd;
int stdout_fd;
int stderr_fd;
+
+ /* An fd that is closed by the execve(), and thus will result in EOF when the execve() is done */
+ int exec_fd;
};
#include "unit.h"
DynamicCreds *dynamic_creds,
pid_t *ret);
-void exec_command_done_array(ExecCommand *c, unsigned n);
-
+void exec_command_done_array(ExecCommand *c, size_t n);
ExecCommand* exec_command_free_list(ExecCommand *c);
-void exec_command_free_array(ExecCommand **c, unsigned n);
-
+void exec_command_free_array(ExecCommand **c, size_t n);
+void exec_command_reset_status_array(ExecCommand *c, size_t n);
+void exec_command_reset_status_list_array(ExecCommand **c, size_t n);
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix);
void exec_command_append_list(ExecCommand **l, ExecCommand *e);
int exec_command_set(ExecCommand *c, const char *path, ...);
void exec_status_start(ExecStatus *s, pid_t pid);
void exec_status_exit(ExecStatus *s, const ExecContext *context, pid_t pid, int code, int status);
void exec_status_dump(const ExecStatus *s, FILE *f, const char *prefix);
+void exec_status_reset(ExecStatus *s);
int exec_runtime_acquire(Manager *m, const ExecContext *c, const char *name, bool create, ExecRuntime **ret);
ExecRuntime *exec_runtime_unref(ExecRuntime *r, bool destroy);
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