174 lines
5.7 KiB
C
174 lines
5.7 KiB
C
// SPDX-License-Identifier: LGPL-2.0-only
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// SPDX-FileCopyrightText: 2023 Oleksij Rempel <linux@rempel-privat.de>
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#ifndef ISOBUSFS_SRV_H
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#define ISOBUSFS_SRV_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/epoll.h>
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#include <dirent.h>
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#include "isobusfs_cmn.h"
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#include "isobusfs_cmn_cm.h"
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#define ISOBUSFS_SRV_VERSION 4
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#define ISOBUSFS_SRV_MAX_CTRL_SOCKETS 1
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#define ISOBUSFS_SRV_MAX_CLIENT_SOCKETS 255
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#define ISOBUSFS_SRV_MAX_EPOLL_EVENTS (ISOBUSFS_SRV_MAX_CTRL_SOCKETS + \
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ISOBUSFS_SRV_MAX_CLIENT_SOCKETS)
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#define ISOBUSFS_SRV_MAX_OPENED_HANDLES 255
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/*
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* ISO 11783-13:2021 standard does not explicitly specify a maximum number of
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* clients that can be supported on the network. However, the ISO 11783 standard
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* is built on top of the SAE J1939 protocol, which has a maximum of 238
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* available addresses for nodes. This number is calculated from the available
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* address range for assignment to nodes on the network, which includes 127
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* addresses in the range 1-127 and 111 addresses in the range 248-254,
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* inclusive. Some addresses in the total range (0-255) are reserved for
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* specific purposes, such as broadcast messages and null addresses.
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*
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* The maximum number of 238 nodes includes both clients and servers, so the
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* actual number of clients that can be supported will be less than 238.
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*
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* It is important to note that the practical limit of clients in an ISO
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* 11783-13 network could be lower due to factors such as network bandwidth,
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* performance constraints of the individual devices, and the complexity of the
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* network.
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*/
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#define ISOBUSFS_SRV_MAX_CLIENTS 237
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enum isobusfs_srv_fss_state {
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ISOBUSFS_SRV_STATE_IDLE = 0, /* send status with 2000ms interval */
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ISOBUSFS_SRV_STATE_STAT_CHANGE_1, /* send status with 200ms interval */
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ISOBUSFS_SRV_STATE_STAT_CHANGE_2, /* send status with 200ms interval */
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ISOBUSFS_SRV_STATE_STAT_CHANGE_3, /* send status with 200ms interval */
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ISOBUSFS_SRV_STATE_STAT_CHANGE_4, /* send status with 200ms interval */
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ISOBUSFS_SRV_STATE_STAT_CHANGE_5, /* send status with 200ms interval */
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ISOBUSFS_SRV_STATE_BUSY, /* send status with 200ms interval */
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};
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struct isobusfs_srv_client {
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int sock;
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struct timespec last_received;
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uint8_t addr;
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uint8_t tan;
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uint8_t version;
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char current_dir[ISOBUSFS_SRV_MAX_PATH_LEN];
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};
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struct isobusfs_srv_volume {
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char *name;
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char *path;
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bool removable;
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bool writeable;
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int refcount;
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struct isobusfs_srv_client *clients[ISOBUSFS_SRV_MAX_CLIENTS];
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};
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struct isobusfs_srv_handles {
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char *path;
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int refcount;
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int fd;
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off_t offset;
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int32_t dir_pos;
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DIR *dir;
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struct isobusfs_srv_client *clients[ISOBUSFS_SRV_MAX_CLIENTS];
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};
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struct isobusfs_srv_priv {
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/* incoming traffic from peers */
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int sock_in;
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/*
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* egress only File Server Status broadcast packets with different
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* prio
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*/
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int sock_fss;
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/*
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* bidirectional socket for NACK packets.
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* ISO 11783-3:2018 5.4.5 Acknowledgement
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*/
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int sock_nack;
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struct sockaddr_can addr;
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int server_version;
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/* fs status related variables */
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struct isobusfs_cm_fss st; /* file server status message */
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enum isobusfs_srv_fss_state st_state;
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struct isobusfs_stats st_msg_stats;
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/* client related variables */
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struct isobusfs_srv_client clients[ISOBUSFS_SRV_MAX_CLIENTS];
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int clients_count;
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struct isobusfs_buf_log tx_buf_log;
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struct libj1939_cmn cmn;
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struct isobusfs_srv_volume volumes[ISOBUSFS_SRV_MAX_VOLUMES];
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int volume_count;
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int removable_volumes_count;
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const char *default_volume;
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/* manufacturer-specific directory */
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char mfs_dir[9];
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uint64_t local_name;
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struct isobusfs_srv_handles handles[ISOBUSFS_SRV_MAX_OPENED_HANDLES];
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int handles_count;
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};
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/* isobusfs_srv.c */
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int isobusfs_srv_send_error(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg, enum isobusfs_error err);
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int isobusfs_srv_sendto(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg, const void *buf,
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size_t buf_size);
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/* isobusfs_srv_cm_fss.c */
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void isobusfs_srv_fss_init(struct isobusfs_srv_priv *priv);
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int isobusfs_srv_fss_send(struct isobusfs_srv_priv *priv);
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/* isobusfs_srv_cm.c */
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int isobusfs_srv_rx_cg_cm(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg);
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void isobusfs_srv_remove_timeouted_clients(struct isobusfs_srv_priv *priv);
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void isobusfs_srv_init_clients(struct isobusfs_srv_priv *priv);
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struct isobusfs_srv_client *isobusfs_srv_get_client(
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struct isobusfs_srv_priv *priv, uint8_t addr);
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struct isobusfs_srv_client *isobusfs_srv_get_client_by_msg(
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struct isobusfs_srv_priv *priv, struct isobusfs_msg *msg);
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/* isobusfs_srv_dh.c */
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int isobusfs_srv_rx_cg_dh(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg);
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int isobusfs_path_to_linux_path(struct isobusfs_srv_priv *priv,
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const char *isobusfs_path, size_t isobusfs_path_size,
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char *linux_path, size_t linux_path_size);
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int isobusfs_check_current_dir_access(struct isobusfs_srv_priv *priv,
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const char *path, size_t path_size);
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int isobusfs_convert_relative_to_absolute(struct isobusfs_srv_priv *priv,
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const char *current_dir,
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const char *rel_path,
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size_t rel_path_size, char *abs_path,
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size_t abs_path_size);
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void isobusfs_srv_set_default_current_dir(struct isobusfs_srv_priv *priv,
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struct isobusfs_srv_client *client);
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/* isobusfs_srv_vh.c */
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int isobusfs_srv_rx_cg_vh(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg);
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/* isobusfs_srv_fh.c */
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int isobusfs_srv_rx_cg_fh(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg);
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/* isobusfs_srv_fa.c */
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int isobusfs_srv_rx_cg_fa(struct isobusfs_srv_priv *priv,
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struct isobusfs_msg *msg);
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void isobusfs_srv_remove_client_from_handles(struct isobusfs_srv_priv *priv,
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struct isobusfs_srv_client *client);
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#endif /* ISOBUSFS_SRV_H */
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