| /* (C) 2018-2019 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| #include <stdint.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include <talloc.h> |
| |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/fsm.h> |
| |
| #include <osmocom/abis/ipa.h> |
| #include <osmocom/gsm/protocol/ipaccess.h> |
| |
| #include "client.h" |
| #include "rspro_util.h" |
| |
| #define S(x) (1 << (x)) |
| |
| static void bankd_updown_cb(struct ipa_client_conn *conn, int up) |
| { |
| struct bankd_client *bc = conn->data; |
| |
| printf("RSPRO link to %s:%d %s\n", conn->addr, conn->port, up ? "UP" : "DOWN"); |
| |
| osmo_fsm_inst_dispatch(bc->bankd_fi, up ? BDC_E_TCP_UP: BDC_E_TCP_DOWN, 0); |
| } |
| |
| int bankd_conn_send_rspro(struct bankd_client *bc, RsproPDU_t *rspro) |
| { |
| return ipa_client_conn_send_rspro(bc->bankd_conn, rspro); |
| } |
| |
| /*********************************************************************** |
| * bankd connection FSM: Remsim Client connection to Bankd |
| ***********************************************************************/ |
| |
| enum bankd_conn_fsm_state { |
| /* waiting for initial connectiong to remsim-bankd */ |
| BDC_ST_INIT, |
| /* bankd connection established, waiting for ClientConnectRes */ |
| BDC_ST_ESTABLISHED, |
| /* bankd connection etsablished, ClientConnect succeeded */ |
| BDC_ST_CONNECTED, |
| /* connection lost, we're waiting for a re-establish */ |
| BDC_ST_REESTABLISH, |
| }; |
| |
| static const struct value_string remsim_client_bankd_fsm_event_names[] = { |
| OSMO_VALUE_STRING(BDC_E_ESTABLISH), |
| OSMO_VALUE_STRING(BDC_E_TCP_UP), |
| OSMO_VALUE_STRING(BDC_E_TCP_DOWN), |
| OSMO_VALUE_STRING(BDC_E_CLIENT_CONN_RES), |
| { 0, NULL } |
| }; |
| |
| #define T1_WAIT_CLIENT_CONN_RES 10 |
| #define T2_RECONNECT 10 |
| |
| |
| static void bdc_st_init(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case BDC_E_ESTABLISH: |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void bdc_st_established_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| struct bankd_client *bc = (struct bankd_client *) fi->priv; |
| RsproPDU_t *pdu; |
| |
| /* FIXME: Send ClientConnReq */ |
| pdu = rspro_gen_ConnectClientReq(&bc->srv_conn.own_comp_id, bc->srv_conn.clslot); |
| bankd_conn_send_rspro(bc, pdu); |
| } |
| |
| static void bdc_st_established(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case BDC_E_TCP_DOWN: |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| case BDC_E_CLIENT_CONN_RES: |
| /* somehow notify the main code? */ |
| osmo_fsm_inst_state_chg(fi, BDC_ST_CONNECTED, 0, 0); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void bdc_st_connected(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case BDC_E_TCP_DOWN: |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void bdc_st_reestablish_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| { |
| struct bankd_client *bc = (struct bankd_client *) fi->priv; |
| int rc; |
| |
| /* re-create bankd_conn */ |
| if (bc->bankd_conn) { |
| LOGPFSML(fi, LOGL_INFO, "Destroying existing connection to bankd\n"); |
| ipa_client_conn_destroy(bc->bankd_conn); |
| bc->bankd_conn = NULL; |
| } |
| LOGPFSML(fi, LOGL_INFO, "Creating TCP connection to bankd at %s:%u\n", |
| bc->bankd_host, bc->bankd_port); |
| bc->bankd_conn = ipa_client_conn_create(bc, NULL, 0, bc->bankd_host, bc->bankd_port, |
| bankd_updown_cb, bankd_read_cb, NULL, bc); |
| if (!bc->bankd_conn) { |
| fprintf(stderr, "Unable to create socket: %s\n", strerror(errno)); |
| exit(1); |
| } |
| |
| /* Attempt to connect TCP socket */ |
| rc = ipa_client_conn_open(bc->bankd_conn); |
| if (rc < 0) { |
| fprintf(stderr, "Unable to connect RSPRO to %s:%d - %s\n", |
| bc->bankd_conn->addr, bc->bankd_conn->port, strerror(errno)); |
| /* FIXME: retry? Timer? Abort? */ |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void bdc_st_reestablish(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case BDC_E_TCP_UP: |
| osmo_fsm_inst_state_chg(fi, BDC_ST_ESTABLISHED, T1_WAIT_CLIENT_CONN_RES, 1); |
| break; |
| case BDC_E_TCP_DOWN: |
| /* wait for normal T2 timeout */ |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static void bdc_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| { |
| switch (event) { |
| case BDC_E_ESTABLISH: |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| static int remsim_client_bankd_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| { |
| switch (fi->T) { |
| case 2: |
| /* TCP reconnect failed: retry */ |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| case 1: |
| /* no ClientConnectRes received: disconnect + reconnect */ |
| osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| break; |
| default: |
| OSMO_ASSERT(0); |
| } |
| return 0; |
| } |
| |
| static const struct osmo_fsm_state bankd_conn_fsm_states[] = { |
| [BDC_ST_INIT] = { |
| .name = "INIT", |
| .in_event_mask = 0, /* S(BDC_E_ESTABLISH) via allstate */ |
| .out_state_mask = S(BDC_ST_REESTABLISH), |
| .action = bdc_st_init, |
| }, |
| [BDC_ST_ESTABLISHED] = { |
| .name = "ESTABLISHED", |
| .in_event_mask = S(BDC_E_TCP_DOWN) | S(BDC_E_CLIENT_CONN_RES), |
| .out_state_mask = S(BDC_ST_CONNECTED) | S(BDC_ST_REESTABLISH), |
| .action = bdc_st_established, |
| .onenter = bdc_st_established_onenter, |
| }, |
| [BDC_ST_CONNECTED] = { |
| .name = "CONNECTED", |
| .in_event_mask = S(BDC_E_TCP_DOWN), |
| .out_state_mask = S(BDC_ST_REESTABLISH), |
| .action = bdc_st_connected, |
| }, |
| [BDC_ST_REESTABLISH] = { |
| .name = "REESTABLISH", |
| .in_event_mask = S(BDC_E_TCP_UP) | S(BDC_E_TCP_DOWN), |
| .out_state_mask = S(BDC_ST_ESTABLISHED) | S(BDC_ST_REESTABLISH), |
| .action = bdc_st_reestablish, |
| .onenter = bdc_st_reestablish_onenter, |
| }, |
| }; |
| |
| struct osmo_fsm remsim_client_bankd_fsm = { |
| .name = "BANKD_CONN", |
| .states = bankd_conn_fsm_states, |
| .num_states = ARRAY_SIZE(bankd_conn_fsm_states), |
| .allstate_event_mask = S(BDC_E_ESTABLISH), |
| .allstate_action = bdc_allstate_action, |
| .timer_cb = remsim_client_bankd_fsm_timer_cb, |
| .log_subsys = DMAIN, |
| .event_names = remsim_client_bankd_fsm_event_names, |
| }; |
| |
| int bankd_conn_fsm_alloc(struct bankd_client *bc) |
| { |
| struct osmo_fsm_inst *fi; |
| |
| fi = osmo_fsm_inst_alloc(&remsim_client_bankd_fsm, bc, bc, LOGL_DEBUG, "bankd"); |
| if (!fi) |
| return -1; |
| |
| bc->bankd_fi = fi; |
| return 0; |
| } |
| |
| static __attribute__((constructor)) void on_dso_load(void) |
| { |
| osmo_fsm_register(&remsim_client_bankd_fsm); |
| } |