src/core/socket.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #ifndef foosockethfoo
   4 #define foosockethfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU General Public License as published by
  13   the Free Software Foundation; either version 2 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 typedef struct Socket Socket;
  26
  27 #include "manager.h"
  28 #include "unit.h"
  29 #include "socket-util.h"
  30 #include "mount.h"
  31 #include "service.h"
  32
  33 typedef enum SocketState {
  34         SOCKET_DEAD,
  35         SOCKET_START_PRE,
  36         SOCKET_START_POST,
  37         SOCKET_LISTENING,
  38         SOCKET_RUNNING,
  39         SOCKET_STOP_PRE,
  40         SOCKET_STOP_PRE_SIGTERM,
  41         SOCKET_STOP_PRE_SIGKILL,
  42         SOCKET_STOP_POST,
  43         SOCKET_FINAL_SIGTERM,
  44         SOCKET_FINAL_SIGKILL,
  45         SOCKET_FAILED,
  46         _SOCKET_STATE_MAX,
  47         _SOCKET_STATE_INVALID = -1
  48 } SocketState;
  49
  50 typedef enum SocketExecCommand {
  51         SOCKET_EXEC_START_PRE,
  52         SOCKET_EXEC_START_POST,
  53         SOCKET_EXEC_STOP_PRE,
  54         SOCKET_EXEC_STOP_POST,
  55         _SOCKET_EXEC_COMMAND_MAX,
  56         _SOCKET_EXEC_COMMAND_INVALID = -1
  57 } SocketExecCommand;
  58
  59 typedef enum SocketType {
  60         SOCKET_SOCKET,
  61         SOCKET_FIFO,
  62         SOCKET_SPECIAL,
  63         SOCKET_MQUEUE,
  64         _SOCKET_FIFO_MAX,
  65         _SOCKET_FIFO_INVALID = -1
  66 } SocketType;
  67
  68 typedef enum SocketResult {
  69         SOCKET_SUCCESS,
  70         SOCKET_FAILURE_RESOURCES,
  71         SOCKET_FAILURE_TIMEOUT,
  72         SOCKET_FAILURE_EXIT_CODE,
  73         SOCKET_FAILURE_SIGNAL,
  74         SOCKET_FAILURE_CORE_DUMP,
  75         SOCKET_FAILURE_SERVICE_FAILED_PERMANENT,
  76         _SOCKET_RESULT_MAX,
  77         _SOCKET_RESULT_INVALID = -1
  78 } SocketResult;
  79
  80 typedef struct SocketPort {
  81         SocketType type;
  82         int fd;
  83
  84         SocketAddress address;
  85         char *path;
  86         Watch fd_watch;
  87
  88         LIST_FIELDS(struct SocketPort, port);
  89 } SocketPort;
  90
  91 struct Socket {
  92         Unit meta;
  93
  94         LIST_HEAD(SocketPort, ports);
  95
  96         unsigned n_accepted;
  97         unsigned n_connections;
  98         unsigned max_connections;
  99
 100         unsigned backlog;
 101         usec_t timeout_usec;
 102
 103         ExecCommand* exec_command[_SOCKET_EXEC_COMMAND_MAX];
 104         ExecContext exec_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
 149 /* Called from the service code when collecting fds */
 150 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds);
 151
 152 /* Called from the service when it shut down */
 153 void socket_notify_service_dead(Socket *s, bool failed_permanent);
 154
 155 /* Called from the mount code figure out if a mount is a dependency of
 156  * any of the sockets of this socket */
 157 int socket_add_one_mount_link(Socket *s, Mount *m);
 158
 159 /* Called from the service code when a per-connection service ended */
 160 void socket_connection_unref(Socket *s);
 161
 162 extern const UnitVTable socket_vtable;
 163
 164 const char* socket_state_to_string(SocketState i);
 165 SocketState socket_state_from_string(const char *s);
 166
 167 const char* socket_exec_command_to_string(SocketExecCommand i);
 168 SocketExecCommand socket_exec_command_from_string(const char *s);
 169
 170 const char* socket_result_to_string(SocketResult i);
 171 SocketResult socket_result_from_string(const char *s);
 172
 173 #endif