src/core/socket.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 Socket Socket;
  25
  26 #include "manager.h"
  27 #include "unit.h"
  28 #include "socket-util.h"
  29 #include "mount.h"
  30 #include "service.h"
  31
  32 typedef enum SocketState {
  33         SOCKET_DEAD,
  34         SOCKET_START_PRE,
  35         SOCKET_START_POST,
  36         SOCKET_LISTENING,
  37         SOCKET_RUNNING,
  38         SOCKET_STOP_PRE,
  39         SOCKET_STOP_PRE_SIGTERM,
  40         SOCKET_STOP_PRE_SIGKILL,
  41         SOCKET_STOP_POST,
  42         SOCKET_FINAL_SIGTERM,
  43         SOCKET_FINAL_SIGKILL,
  44         SOCKET_FAILED,
  45         _SOCKET_STATE_MAX,
  46         _SOCKET_STATE_INVALID = -1
  47 } SocketState;
  48
  49 typedef enum SocketExecCommand {
  50         SOCKET_EXEC_START_PRE,
  51         SOCKET_EXEC_START_POST,
  52         SOCKET_EXEC_STOP_PRE,
  53         SOCKET_EXEC_STOP_POST,
  54         _SOCKET_EXEC_COMMAND_MAX,
  55         _SOCKET_EXEC_COMMAND_INVALID = -1
  56 } SocketExecCommand;
  57
  58 typedef enum SocketType {
  59         SOCKET_SOCKET,
  60         SOCKET_FIFO,
  61         SOCKET_SPECIAL,
  62         SOCKET_MQUEUE,
  63         _SOCKET_FIFO_MAX,
  64         _SOCKET_FIFO_INVALID = -1
  65 } SocketType;
  66
  67 typedef enum SocketResult {
  68         SOCKET_SUCCESS,
  69         SOCKET_FAILURE_RESOURCES,
  70         SOCKET_FAILURE_TIMEOUT,
  71         SOCKET_FAILURE_EXIT_CODE,
  72         SOCKET_FAILURE_SIGNAL,
  73         SOCKET_FAILURE_CORE_DUMP,
  74         SOCKET_FAILURE_SERVICE_FAILED_PERMANENT,
  75         _SOCKET_RESULT_MAX,
  76         _SOCKET_RESULT_INVALID = -1
  77 } SocketResult;
  78
  79 typedef struct SocketPort {
  80         SocketType type;
  81         int fd;
  82
  83         SocketAddress address;
  84         char *path;
  85         Watch fd_watch;
  86
  87         LIST_FIELDS(struct SocketPort, port);
  88 } SocketPort;
  89
  90 struct Socket {
  91         Unit meta;
  92
  93         LIST_HEAD(SocketPort, ports);
  94
  95         unsigned n_accepted;
  96         unsigned n_connections;
  97         unsigned max_connections;
  98
  99         unsigned backlog;
 100         usec_t timeout_usec;
 101
 102         ExecCommand* exec_command[_SOCKET_EXEC_COMMAND_MAX];
 103         ExecContext exec_context;
 104         KillContext kill_context;
 105
 106         /* For Accept=no sockets refers to the one service we'll
 107         activate. For Accept=yes sockets is either NULL, or filled
 108         when the next service we spawn. */
 109         UnitRef service;
 110
 111         SocketState state, deserialized_state;
 112
 113         Watch timer_watch;
 114
 115         ExecCommand* control_command;
 116         SocketExecCommand control_command_id;
 117         pid_t control_pid;
 118
 119         mode_t directory_mode;
 120         mode_t socket_mode;
 121
 122         SocketResult result;
 123
 124         bool accept;
 125
 126         /* Socket options */
 127         bool keep_alive;
 128         bool free_bind;
 129         bool transparent;
 130         bool broadcast;
 131         bool pass_cred;
 132         bool pass_sec;
 133         int priority;
 134         int mark;
 135         size_t receive_buffer;
 136         size_t send_buffer;
 137         int ip_tos;
 138         int ip_ttl;
 139         size_t pipe_size;
 140         char *bind_to_device;
 141         char *tcp_congestion;
 142         long mq_maxmsg;
 143         long mq_msgsize;
 144
 145         /* Only for INET6 sockets: issue IPV6_V6ONLY sockopt */
 146         SocketAddressBindIPv6Only bind_ipv6_only;
 147
 148         char *smack;
 149         char *smack_ip_in;
 150         char *smack_ip_out;
 151 };
 152
 153 /* Called from the service code when collecting fds */
 154 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds);
 155
 156 /* Called from the service when it shut down */
 157 void socket_notify_service_dead(Socket *s, bool failed_permanent);
 158
 159 /* Called from the mount code figure out if a mount is a dependency of
 160  * any of the sockets of this socket */
 161 int socket_add_one_mount_link(Socket *s, Mount *m);
 162
 163 /* Called from the service code when a per-connection service ended */
 164 void socket_connection_unref(Socket *s);
 165
 166 void socket_free_ports(Socket *s);
 167
 168 extern const UnitVTable socket_vtable;
 169
 170 const char* socket_state_to_string(SocketState i) _const_;
 171 SocketState socket_state_from_string(const char *s) _pure_;
 172
 173 const char* socket_exec_command_to_string(SocketExecCommand i) _const_;
 174 SocketExecCommand socket_exec_command_from_string(const char *s) _pure_;
 175
 176 const char* socket_result_to_string(SocketResult i) _const_;
 177 SocketResult socket_result_from_string(const char *s) _pure_;
 178
 179 const char* socket_port_type_to_string(SocketPort *p) _pure_;