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 Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser 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