345 lines
8.2 KiB
C
345 lines
8.2 KiB
C
/* BTSAP socket interface of layer2/3 stack */
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/* (C) 2010 by Holger Hans Peter Freyther
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* (C) 2010,2018 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
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* (C) 2011 by Nico Golde <nico@ngolde.de>
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* (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <osmocom/core/write_queue.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/bb/common/osmocom_data.h>
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#include <osmocom/bb/common/logging.h>
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#include <osmocom/bb/common/sap_interface.h>
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#include <osmocom/bb/common/sap_proto.h>
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#include <osmocom/bb/common/sap_fsm.h>
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/*! Send ATR request to the Server.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_send_atr_req(struct osmocom_ms *ms)
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{
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struct msgb *msg;
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int rc;
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if (!ms->sap_entity.fi) {
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LOGP(DSAP, LOGL_ERROR, "SAP interface is not connected\n");
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return -EAGAIN;
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}
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msg = sap_msgb_alloc(SAP_TRANSFER_ATR_REQ);
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if (!msg)
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return -ENOMEM;
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rc = osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_TRANSFER_ATR_REQ, msg);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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return 0;
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}
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/*! Send APDU request to the Server.
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* \param[in] ms MS instance with active SAP connection
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* \param[in] apdu APDU to be send
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* \param[in] apdu_len length of APDU
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_send_apdu(struct osmocom_ms *ms, uint8_t *apdu, uint16_t apdu_len)
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{
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struct msgb *msg;
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int rc;
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if (!ms->sap_entity.fi) {
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LOGP(DSAP, LOGL_ERROR, "SAP interface is not connected\n");
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return -EAGAIN;
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}
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msg = sap_msgb_alloc(SAP_TRANSFER_APDU_REQ);
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if (!msg)
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return -ENOMEM;
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sap_msgb_add_param(msg, SAP_COMMAND_APDU, apdu_len, apdu);
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rc = osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_TRANSFER_APDU_REQ, msg);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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return 0;
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}
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/*! Send (SIM) reset request to the Server.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_send_reset_req(struct osmocom_ms *ms)
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{
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struct msgb *msg;
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int rc;
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if (!ms->sap_entity.fi) {
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LOGP(DSAP, LOGL_ERROR, "SAP interface is not connected\n");
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return -EAGAIN;
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}
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msg = sap_msgb_alloc(SAP_RESET_SIM_REQ);
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if (!msg)
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return -ENOMEM;
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rc = osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_RESET_SIM_REQ, msg);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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return 0;
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}
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/*! Send (SIM) power on request to the Server.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_send_poweron_req(struct osmocom_ms *ms)
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{
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struct msgb *msg;
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int rc;
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if (!ms->sap_entity.fi) {
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LOGP(DSAP, LOGL_ERROR, "SAP interface is not connected\n");
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return -EAGAIN;
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}
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msg = sap_msgb_alloc(SAP_POWER_SIM_ON_REQ);
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if (!msg)
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return -ENOMEM;
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rc = osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_POWER_SIM_ON_REQ, msg);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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return 0;
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}
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/*! Send (SIM) power off request to the Server.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_send_poweroff_req(struct osmocom_ms *ms)
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{
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struct msgb *msg;
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int rc;
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if (!ms->sap_entity.fi) {
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LOGP(DSAP, LOGL_ERROR, "SAP interface is not connected\n");
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return -EAGAIN;
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}
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msg = sap_msgb_alloc(SAP_POWER_SIM_OFF_REQ);
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if (!msg)
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return -ENOMEM;
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rc = osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_POWER_SIM_OFF_REQ, msg);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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return 0;
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}
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static int sap_read_cb(struct osmo_fd *fd)
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{
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struct osmocom_ms *ms = (struct osmocom_ms *) fd->data;
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struct osmosap_entity *sap = &ms->sap_entity;
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uint8_t buf[GSM_SAP_LENGTH];
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struct msgb *msg;
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ssize_t rc;
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/* Prevent buffer overflow */
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OSMO_ASSERT(sap->max_msg_size <= GSM_SAP_LENGTH);
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rc = read(fd->fd, buf, sap->max_msg_size);
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if (rc < 0) {
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LOGP(DSAP, LOGL_ERROR, "SAP socket failed\n");
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rc = -EIO;
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goto conn_error;
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}
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if (rc == 0) {
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LOGP(DSAP, LOGL_NOTICE, "SAP socket closed by server\n");
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rc = -ECONNREFUSED;
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goto conn_error;
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}
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LOGP(DSAP, LOGL_DEBUG, "RX SAP message '%s' (len=%zd): %s\n",
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get_value_string(sap_msg_names, buf[0]),
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rc, osmo_hexdump(buf, rc));
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/* Parse received SAP message and allocate a new msgb */
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msg = sap_msg_parse(buf, rc, sap->max_msg_size);
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if (!msg) {
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LOGP(DSAP, LOGL_ERROR, "Failed to parse SAP message\n");
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return -EINVAL;
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}
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/* Pass parsed message to our FSM using message ID as event */
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rc = osmo_fsm_inst_dispatch(sap->fi, msg->data[0], msg->data);
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if (rc) {
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msgb_free(msg);
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return rc;
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}
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/* Pass to (optional) SAP message handler */
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if (sap->sap_msg_cb)
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sap->sap_msg_cb(ms, msg);
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else
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msgb_free(msg);
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return 0;
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conn_error:
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/* Immediately tear-down FSM */
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osmo_fsm_inst_state_chg(sap->fi, SAP_STATE_NOT_CONNECTED, 0, 0);
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return rc;
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}
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static int sap_write_cb(struct osmo_fd *fd, struct msgb *msg)
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{
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ssize_t rc;
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if (fd->fd <= 0)
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return -EINVAL;
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rc = write(fd->fd, msg->data, msg->len);
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if (rc != msg->len) {
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LOGP(DSAP, LOGL_ERROR, "Failed to write data\n");
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return rc;
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}
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LOGP(DSAP, LOGL_DEBUG, "TX SAP message '%s' (len=%u): %s\n",
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get_value_string(sap_msg_names, msg->data[0]),
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msg->len, osmo_hexdump(msg->data, msg->len));
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return 0;
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}
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/*! Establishes SAP connection to the Server,
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* allocates SAP FSM, and triggers connection procedure.
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* \param[in] ms MS instance with configured SAP socket path
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_open(struct osmocom_ms *ms)
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{
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int rc;
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LOGP(DSAP, LOGL_INFO, "Establishing SAP connection "
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"(using socket '%s')\n", ms->settings.sap_socket_path);
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rc = osmo_sock_unix_init_ofd(&ms->sap_wq.bfd, SOCK_STREAM, 0,
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ms->settings.sap_socket_path, OSMO_SOCK_F_CONNECT);
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if (rc < 0) {
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LOGP(DSAP, LOGL_ERROR, "Failed to create unix domain socket %s: %s\n",
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ms->settings.sap_socket_path, strerror(-rc));
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return rc;
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}
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osmo_wqueue_init(&ms->sap_wq, 100);
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ms->sap_wq.bfd.data = ms;
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ms->sap_wq.read_cb = &sap_read_cb;
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ms->sap_wq.write_cb = &sap_write_cb;
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/* Allocate a SAP FSM for a given ms */
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rc = sap_fsm_alloc(ms);
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if (rc) {
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_sap_close_sock(ms);
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return rc;
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}
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/* Initiate SAP connection with Server */
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LOGP(DSAP, LOGL_DEBUG, "Connecting to the Server...\n");
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return osmo_fsm_inst_state_chg(ms->sap_entity.fi, SAP_STATE_CONNECTING,
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SAP_FSM_CONN_EST_TIMEOUT, SAP_FSM_CONN_EST_T);
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}
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/*! Closes SAP connection with the Server.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int sap_close(struct osmocom_ms *ms)
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{
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if (ms->sap_entity.fi == NULL) {
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LOGP(DSAP, LOGL_NOTICE, "No active SAP connection (no FSM)\n");
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return -EINVAL;
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}
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LOGP(DSAP, LOGL_INFO, "Closing SAP connection\n");
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return osmo_fsm_inst_dispatch(ms->sap_entity.fi,
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SAP_DISCONNECT_REQ, NULL);
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}
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/*! Low-level function for closing SAP (socket) connection.
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* \param[in] ms MS instance with active SAP connection
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* \returns 0 in case of success, negative in case of error
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*/
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int _sap_close_sock(struct osmocom_ms *ms)
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{
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if (ms->sap_wq.bfd.fd <= 0)
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return -EINVAL;
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close(ms->sap_wq.bfd.fd);
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ms->sap_wq.bfd.fd = -1;
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osmo_fd_unregister(&ms->sap_wq.bfd);
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osmo_wqueue_clear(&ms->sap_wq);
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return 0;
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}
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/*! Init SAP client state for a given MS. */
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void sap_init(struct osmocom_ms *ms)
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{
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struct osmosap_entity *sap = &ms->sap_entity;
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LOGP(DSAP, LOGL_INFO, "init SAP client\n");
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/* Default MaxMsgSize (to be negotiated) */
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sap->max_msg_size = GSM_SAP_LENGTH;
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/* SIM card status is not known yet */
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sap->card_status = SAP_CARD_STATUS_NOT_ACC;
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}
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