| /* |
| Copyright (c) 2012-2013 Martin Sustrik All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "atcp.h" |
| |
| #include "../../utils/err.h" |
| #include "../../utils/cont.h" |
| #include "../../utils/attr.h" |
| |
| #define NN_ATCP_STATE_IDLE 1 |
| #define NN_ATCP_STATE_ACCEPTING 2 |
| #define NN_ATCP_STATE_ACTIVE 3 |
| #define NN_ATCP_STATE_STOPPING_STCP 4 |
| #define NN_ATCP_STATE_STOPPING_USOCK 5 |
| #define NN_ATCP_STATE_DONE 6 |
| #define NN_ATCP_STATE_STOPPING_STCP_FINAL 7 |
| #define NN_ATCP_STATE_STOPPING 8 |
| |
| #define NN_ATCP_SRC_USOCK 1 |
| #define NN_ATCP_SRC_STCP 2 |
| #define NN_ATCP_SRC_LISTENER 3 |
| |
| /* Private functions. */ |
| static void nn_atcp_handler (struct nn_fsm *self, int src, int type, |
| void *srcptr); |
| static void nn_atcp_shutdown (struct nn_fsm *self, int src, int type, |
| void *srcptr); |
| |
| void nn_atcp_init (struct nn_atcp *self, int src, |
| struct nn_epbase *epbase, struct nn_fsm *owner) |
| { |
| nn_fsm_init (&self->fsm, nn_atcp_handler, nn_atcp_shutdown, |
| src, self, owner); |
| self->state = NN_ATCP_STATE_IDLE; |
| self->epbase = epbase; |
| nn_usock_init (&self->usock, NN_ATCP_SRC_USOCK, &self->fsm); |
| self->listener = NULL; |
| self->listener_owner.src = -1; |
| self->listener_owner.fsm = NULL; |
| nn_stcp_init (&self->stcp, NN_ATCP_SRC_STCP, epbase, &self->fsm); |
| nn_fsm_event_init (&self->accepted); |
| nn_fsm_event_init (&self->done); |
| nn_list_item_init (&self->item); |
| } |
| |
| void nn_atcp_term (struct nn_atcp *self) |
| { |
| nn_assert_state (self, NN_ATCP_STATE_IDLE); |
| |
| nn_list_item_term (&self->item); |
| nn_fsm_event_term (&self->done); |
| nn_fsm_event_term (&self->accepted); |
| nn_stcp_term (&self->stcp); |
| nn_usock_term (&self->usock); |
| nn_fsm_term (&self->fsm); |
| } |
| |
| int nn_atcp_isidle (struct nn_atcp *self) |
| { |
| return nn_fsm_isidle (&self->fsm); |
| } |
| |
| void nn_atcp_start (struct nn_atcp *self, struct nn_usock *listener) |
| { |
| nn_assert_state (self, NN_ATCP_STATE_IDLE); |
| |
| /* Take ownership of the listener socket. */ |
| self->listener = listener; |
| self->listener_owner.src = NN_ATCP_SRC_LISTENER; |
| self->listener_owner.fsm = &self->fsm; |
| nn_usock_swap_owner (listener, &self->listener_owner); |
| |
| /* Start the state machine. */ |
| nn_fsm_start (&self->fsm); |
| } |
| |
| void nn_atcp_stop (struct nn_atcp *self) |
| { |
| nn_fsm_stop (&self->fsm); |
| } |
| |
| static void nn_atcp_shutdown (struct nn_fsm *self, int src, int type, |
| NN_UNUSED void *srcptr) |
| { |
| struct nn_atcp *atcp; |
| |
| atcp = nn_cont (self, struct nn_atcp, fsm); |
| |
| if (nn_slow (src == NN_FSM_ACTION && type == NN_FSM_STOP)) { |
| if (!nn_stcp_isidle (&atcp->stcp)) { |
| nn_epbase_stat_increment (atcp->epbase, |
| NN_STAT_DROPPED_CONNECTIONS, 1); |
| nn_stcp_stop (&atcp->stcp); |
| } |
| atcp->state = NN_ATCP_STATE_STOPPING_STCP_FINAL; |
| } |
| if (nn_slow (atcp->state == NN_ATCP_STATE_STOPPING_STCP_FINAL)) { |
| if (!nn_stcp_isidle (&atcp->stcp)) |
| return; |
| nn_usock_stop (&atcp->usock); |
| atcp->state = NN_ATCP_STATE_STOPPING; |
| } |
| if (nn_slow (atcp->state == NN_ATCP_STATE_STOPPING)) { |
| if (!nn_usock_isidle (&atcp->usock)) |
| return; |
| if (atcp->listener) { |
| nn_assert (atcp->listener_owner.fsm); |
| nn_usock_swap_owner (atcp->listener, &atcp->listener_owner); |
| atcp->listener = NULL; |
| atcp->listener_owner.src = -1; |
| atcp->listener_owner.fsm = NULL; |
| } |
| atcp->state = NN_ATCP_STATE_IDLE; |
| nn_fsm_stopped (&atcp->fsm, NN_ATCP_STOPPED); |
| return; |
| } |
| |
| nn_fsm_bad_action(atcp->state, src, type); |
| } |
| |
| static void nn_atcp_handler (struct nn_fsm *self, int src, int type, |
| NN_UNUSED void *srcptr) |
| { |
| struct nn_atcp *atcp; |
| int val; |
| size_t sz; |
| |
| atcp = nn_cont (self, struct nn_atcp, fsm); |
| |
| switch (atcp->state) { |
| |
| /******************************************************************************/ |
| /* IDLE state. */ |
| /* The state machine wasn't yet started. */ |
| /******************************************************************************/ |
| case NN_ATCP_STATE_IDLE: |
| switch (src) { |
| |
| case NN_FSM_ACTION: |
| switch (type) { |
| case NN_FSM_START: |
| nn_usock_accept (&atcp->usock, atcp->listener); |
| atcp->state = NN_ATCP_STATE_ACCEPTING; |
| return; |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| default: |
| nn_fsm_bad_source (atcp->state, src, type); |
| } |
| |
| /******************************************************************************/ |
| /* ACCEPTING state. */ |
| /* Waiting for incoming connection. */ |
| /******************************************************************************/ |
| case NN_ATCP_STATE_ACCEPTING: |
| switch (src) { |
| |
| case NN_ATCP_SRC_USOCK: |
| switch (type) { |
| case NN_USOCK_ACCEPTED: |
| nn_epbase_clear_error (atcp->epbase); |
| |
| /* Set the relevant socket options. */ |
| sz = sizeof (val); |
| nn_epbase_getopt (atcp->epbase, NN_SOL_SOCKET, NN_SNDBUF, |
| &val, &sz); |
| nn_assert (sz == sizeof (val)); |
| nn_usock_setsockopt (&atcp->usock, SOL_SOCKET, SO_SNDBUF, |
| &val, sizeof (val)); |
| sz = sizeof (val); |
| nn_epbase_getopt (atcp->epbase, NN_SOL_SOCKET, NN_RCVBUF, |
| &val, &sz); |
| nn_assert (sz == sizeof (val)); |
| nn_usock_setsockopt (&atcp->usock, SOL_SOCKET, SO_RCVBUF, |
| &val, sizeof (val)); |
| |
| /* Return ownership of the listening socket to the parent. */ |
| nn_usock_swap_owner (atcp->listener, &atcp->listener_owner); |
| atcp->listener = NULL; |
| atcp->listener_owner.src = -1; |
| atcp->listener_owner.fsm = NULL; |
| nn_fsm_raise (&atcp->fsm, &atcp->accepted, NN_ATCP_ACCEPTED); |
| |
| /* Start the stcp state machine. */ |
| nn_usock_activate (&atcp->usock); |
| nn_stcp_start (&atcp->stcp, &atcp->usock); |
| atcp->state = NN_ATCP_STATE_ACTIVE; |
| |
| nn_epbase_stat_increment (atcp->epbase, |
| NN_STAT_ACCEPTED_CONNECTIONS, 1); |
| |
| return; |
| |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| case NN_ATCP_SRC_LISTENER: |
| switch (type) { |
| |
| case NN_USOCK_ACCEPT_ERROR: |
| nn_epbase_set_error (atcp->epbase, |
| nn_usock_geterrno(atcp->listener)); |
| nn_epbase_stat_increment (atcp->epbase, |
| NN_STAT_ACCEPT_ERRORS, 1); |
| nn_usock_accept (&atcp->usock, atcp->listener); |
| return; |
| |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| default: |
| nn_fsm_bad_source (atcp->state, src, type); |
| } |
| |
| /******************************************************************************/ |
| /* ACTIVE state. */ |
| /******************************************************************************/ |
| case NN_ATCP_STATE_ACTIVE: |
| switch (src) { |
| |
| case NN_ATCP_SRC_STCP: |
| switch (type) { |
| case NN_STCP_ERROR: |
| nn_stcp_stop (&atcp->stcp); |
| atcp->state = NN_ATCP_STATE_STOPPING_STCP; |
| nn_epbase_stat_increment (atcp->epbase, |
| NN_STAT_BROKEN_CONNECTIONS, 1); |
| return; |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| default: |
| nn_fsm_bad_source (atcp->state, src, type); |
| } |
| |
| /******************************************************************************/ |
| /* STOPPING_STCP state. */ |
| /******************************************************************************/ |
| case NN_ATCP_STATE_STOPPING_STCP: |
| switch (src) { |
| |
| case NN_ATCP_SRC_STCP: |
| switch (type) { |
| case NN_USOCK_SHUTDOWN: |
| return; |
| case NN_STCP_STOPPED: |
| nn_usock_stop (&atcp->usock); |
| atcp->state = NN_ATCP_STATE_STOPPING_USOCK; |
| return; |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| default: |
| nn_fsm_bad_source (atcp->state, src, type); |
| } |
| |
| /******************************************************************************/ |
| /* STOPPING_USOCK state. */ |
| /******************************************************************************/ |
| case NN_ATCP_STATE_STOPPING_USOCK: |
| switch (src) { |
| |
| case NN_ATCP_SRC_USOCK: |
| switch (type) { |
| case NN_USOCK_SHUTDOWN: |
| return; |
| case NN_USOCK_STOPPED: |
| nn_fsm_raise (&atcp->fsm, &atcp->done, NN_ATCP_ERROR); |
| atcp->state = NN_ATCP_STATE_DONE; |
| return; |
| default: |
| nn_fsm_bad_action (atcp->state, src, type); |
| } |
| |
| default: |
| nn_fsm_bad_source (atcp->state, src, type); |
| } |
| |
| /******************************************************************************/ |
| /* Invalid state. */ |
| /******************************************************************************/ |
| default: |
| nn_fsm_bad_state (atcp->state, src, type); |
| } |
| } |
| |