src/core/execute.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 typedef struct ExecStatus ExecStatus;
  25 typedef struct ExecCommand ExecCommand;
  26 typedef struct ExecContext ExecContext;
  27 typedef struct ExecRuntime ExecRuntime;
  28
  29 #include <linux/types.h>
  30 #include <sys/time.h>
  31 #include <sys/resource.h>
  32 #include <sys/capability.h>
  33 #include <stdbool.h>
  34 #include <stdio.h>
  35 #include <sched.h>
  36
  37 #include "list.h"
  38 #include "util.h"
  39 #include "set.h"
  40 #include "fdset.h"
  41 #include "missing.h"
  42
  43 typedef enum ExecInput {
  44         EXEC_INPUT_NULL,
  45         EXEC_INPUT_TTY,
  46         EXEC_INPUT_TTY_FORCE,
  47         EXEC_INPUT_TTY_FAIL,
  48         EXEC_INPUT_SOCKET,
  49         _EXEC_INPUT_MAX,
  50         _EXEC_INPUT_INVALID = -1
  51 } ExecInput;
  52
  53 typedef enum ExecOutput {
  54         EXEC_OUTPUT_INHERIT,
  55         EXEC_OUTPUT_NULL,
  56         EXEC_OUTPUT_TTY,
  57         EXEC_OUTPUT_SYSLOG,
  58         EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
  59         EXEC_OUTPUT_KMSG,
  60         EXEC_OUTPUT_KMSG_AND_CONSOLE,
  61         EXEC_OUTPUT_JOURNAL,
  62         EXEC_OUTPUT_JOURNAL_AND_CONSOLE,
  63         EXEC_OUTPUT_SOCKET,
  64         _EXEC_OUTPUT_MAX,
  65         _EXEC_OUTPUT_INVALID = -1
  66 } ExecOutput;
  67
  68 struct ExecStatus {
  69         dual_timestamp start_timestamp;
  70         dual_timestamp exit_timestamp;
  71         pid_t pid;
  72         int code;     /* as in siginfo_t::si_code */
  73         int status;   /* as in sigingo_t::si_status */
  74 };
  75
  76 struct ExecCommand {
  77         char *path;
  78         char **argv;
  79         ExecStatus exec_status;
  80         LIST_FIELDS(ExecCommand, command); /* useful for chaining commands */
  81         bool ignore;
  82 };
  83
  84 struct ExecRuntime {
  85         int n_ref;
  86
  87         char *tmp_dir;
  88         char *var_tmp_dir;
  89
  90         int netns_storage_socket[2];
  91 };
  92
  93 struct ExecContext {
  94         char **environment;
  95         char **environment_files;
  96
  97         struct rlimit *rlimit[_RLIMIT_MAX];
  98         char *working_directory, *root_directory;
  99
 100         mode_t umask;
 101         int oom_score_adjust;
 102         int nice;
 103         int ioprio;
 104         int cpu_sched_policy;
 105         int cpu_sched_priority;
 106
 107         cpu_set_t *cpuset;
 108         unsigned cpuset_ncpus;
 109
 110         ExecInput std_input;
 111         ExecOutput std_output;
 112         ExecOutput std_error;
 113
 114         nsec_t timer_slack_nsec;
 115
 116         char *tcpwrap_name;
 117
 118         char *tty_path;
 119
 120         bool tty_reset;
 121         bool tty_vhangup;
 122         bool tty_vt_disallocate;
 123
 124         bool ignore_sigpipe;
 125
 126         /* Since resolving these names might might involve socket
 127          * connections and we don't want to deadlock ourselves these
 128          * names are resolved on execution only and in the child
 129          * process. */
 130         char *user;
 131         char *group;
 132         char **supplementary_groups;
 133
 134         char *pam_name;
 135
 136         char *utmp_id;
 137
 138         bool selinux_context_ignore;
 139         char *selinux_context;
 140
 141         bool apparmor_profile_ignore;
 142         char *apparmor_profile;
 143
 144         char **read_write_dirs, **read_only_dirs, **inaccessible_dirs;
 145         unsigned long mount_flags;
 146
 147         uint64_t capability_bounding_set_drop;
 148
 149         cap_t capabilities;
 150         int secure_bits;
 151
 152         int syslog_priority;
 153         char *syslog_identifier;
 154         bool syslog_level_prefix;
 155
 156         bool cpu_sched_reset_on_fork;
 157         bool non_blocking;
 158         bool private_tmp;
 159         bool private_network;
 160         bool private_devices;
 161
 162         bool no_new_privileges;
 163
 164         /* This is not exposed to the user but available
 165          * internally. We need it to make sure that whenever we spawn
 166          * /bin/mount it is run in the same process group as us so
 167          * that the autofs logic detects that it belongs to us and we
 168          * don't enter a trigger loop. */
 169         bool same_pgrp;
 170
 171         unsigned long personality;
 172
 173         Set *syscall_filter;
 174         Set *syscall_archs;
 175         int syscall_errno;
 176         bool syscall_whitelist:1;
 177
 178         Set *address_families;
 179         bool address_families_whitelist:1;
 180
 181         char **runtime_directory;
 182         mode_t runtime_directory_mode;
 183
 184         bool oom_score_adjust_set:1;
 185         bool nice_set:1;
 186         bool ioprio_set:1;
 187         bool cpu_sched_set:1;
 188         bool no_new_privileges_set:1;
 189 };
 190
 191 #include "cgroup.h"
 192
 193 int exec_spawn(ExecCommand *command,
 194                char **argv,
 195                ExecContext *context,
 196                int fds[], unsigned n_fds,
 197                char **environment,
 198                bool apply_permissions,
 199                bool apply_chroot,
 200                bool apply_tty_stdin,
 201                bool confirm_spawn,
 202                CGroupControllerMask cgroup_mask,
 203                const char *cgroup_path,
 204                const char *runtime_prefix,
 205                const char *unit_id,
 206                usec_t watchdog_usec,
 207                int pipe_fd[2],
 208                ExecRuntime *runtime,
 209                pid_t *ret);
 210
 211 void exec_command_done(ExecCommand *c);
 212 void exec_command_done_array(ExecCommand *c, unsigned n);
 213
 214 void exec_command_free_list(ExecCommand *c);
 215 void exec_command_free_array(ExecCommand **c, unsigned n);
 216
 217 char *exec_command_line(char **argv);
 218
 219 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix);
 220 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix);
 221 void exec_command_append_list(ExecCommand **l, ExecCommand *e);
 222 int exec_command_set(ExecCommand *c, const char *path, ...);
 223
 224 void exec_context_init(ExecContext *c);
 225 void exec_context_done(ExecContext *c);
 226 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix);
 227
 228 int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_root);
 229
 230 int exec_context_load_environment(const ExecContext *c, char ***l);
 231
 232 bool exec_context_may_touch_console(ExecContext *c);
 233
 234 void exec_status_start(ExecStatus *s, pid_t pid);
 235 void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status);
 236 void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix);
 237
 238 int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id);
 239 ExecRuntime *exec_runtime_ref(ExecRuntime *r);
 240 ExecRuntime *exec_runtime_unref(ExecRuntime *r);
 241
 242 int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds);
 243 int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds);
 244
 245 void exec_runtime_destroy(ExecRuntime *rt);
 246
 247 const char* exec_output_to_string(ExecOutput i) _const_;
 248 ExecOutput exec_output_from_string(const char *s) _pure_;
 249
 250 const char* exec_input_to_string(ExecInput i) _const_;
 251 ExecInput exec_input_from_string(const char *s) _pure_;