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Diffstat (limited to '')
| -rw-r--r-- | lib/mgmt_msg.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/lib/mgmt_msg.h b/lib/mgmt_msg.h new file mode 100644 index 0000000..dd7ae59 --- /dev/null +++ b/lib/mgmt_msg.h @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * March 6 2023, Christian Hopps <chopps@labn.net> + * + * Copyright (c) 2023, LabN Consulting, L.L.C. + */ +#ifndef _MGMT_MSG_H +#define _MGMT_MSG_H + +#include "memory.h" +#include "stream.h" +#include "frrevent.h" + +DECLARE_MTYPE(MSG_CONN); + +/* + * Messages on the stream start with a marker that encodes a version octet. + */ +#define MGMT_MSG_MARKER_PFX (0x23232300u) /* ASCII - "###\ooo"*/ +#define MGMT_MSG_IS_MARKER(x) (((x)&0xFFFFFF00u) == MGMT_MSG_MARKER_PFX) +#define MGMT_MSG_MARKER(version) (MGMT_MSG_MARKER_PFX | (version)) +#define MGMT_MSG_MARKER_VERSION(x) (0xFF & (x)) + +#define MGMT_MSG_VERSION_PROTOBUF 0 +#define MGMT_MSG_VERSION_NATIVE 1 + + +struct mgmt_msg_state { + struct stream *ins; + struct stream *outs; + struct stream_fifo inq; + struct stream_fifo outq; + uint64_t nrxm; /* number of received messages */ + uint64_t nrxb; /* number of received bytes */ + uint64_t ntxm; /* number of sent messages */ + uint64_t ntxb; /* number of sent bytes */ + size_t max_read_buf; /* should replace with max time value */ + size_t max_write_buf; /* should replace with max time value */ + size_t max_msg_sz; + char *idtag; /* identifying tag for messages */ +}; + +struct mgmt_msg_hdr { + uint32_t marker; + uint32_t len; +}; + +enum mgmt_msg_rsched { + MSR_SCHED_BOTH, /* schedule both queue and read */ + MSR_SCHED_STREAM, /* schedule read */ + MSR_DISCONNECT, /* disconnect and start reconnecting */ +}; + +enum mgmt_msg_wsched { + MSW_SCHED_NONE, /* no scheduling required */ + MSW_SCHED_STREAM, /* schedule writing */ + MSW_DISCONNECT, /* disconnect and start reconnecting */ +}; + +struct msg_conn; + + +extern int mgmt_msg_connect(const char *path, size_t sendbuf, size_t recvbuf, + const char *dbgtag); +extern bool mgmt_msg_procbufs(struct mgmt_msg_state *ms, + void (*handle_msg)(uint8_t version, uint8_t *msg, + size_t msglen, void *user), + void *user, bool debug); +extern enum mgmt_msg_rsched mgmt_msg_read(struct mgmt_msg_state *ms, int fd, + bool debug); +extern size_t mgmt_msg_reset_writes(struct mgmt_msg_state *ms); +extern int mgmt_msg_send_msg(struct mgmt_msg_state *ms, uint8_t version, + void *msg, size_t len, + size_t (*packf)(void *msg, void *buf), bool debug); +extern enum mgmt_msg_wsched mgmt_msg_write(struct mgmt_msg_state *ms, int fd, + bool debug); + +extern void mgmt_msg_destroy(struct mgmt_msg_state *state); + +extern void mgmt_msg_init(struct mgmt_msg_state *ms, size_t max_read_buf, + size_t max_write_buf, size_t max_msg_sz, + const char *idtag); + +/* + * Connections + */ + +struct msg_conn { + int fd; + struct mgmt_msg_state mstate; + struct event_loop *loop; + struct event *read_ev; + struct event *write_ev; + struct event *proc_msg_ev; + struct msg_conn *remote_conn; + int (*notify_disconnect)(struct msg_conn *conn); + void (*handle_msg)(uint8_t version, uint8_t *data, size_t len, + struct msg_conn *conn); + void *user; + uint short_circuit_depth; + bool is_short_circuit; /* true when the message being handled is SC */ + bool is_client; + bool debug; +}; + + +/* + * `notify_disconnect` is not called when `msg_conn_cleanup` is called for a + * msg_conn which is currently connected. The socket is closed but there is no + * notification. + */ +extern void msg_conn_cleanup(struct msg_conn *conn); +extern void msg_conn_disconnect(struct msg_conn *conn, bool reconnect); +extern int msg_conn_send_msg(struct msg_conn *client, uint8_t version, + void *msg, size_t mlen, + size_t (*packf)(void *, void *), + bool short_circuit_ok); + +/* + * Client-side Connections + */ + +struct msg_client { + struct msg_conn conn; + struct event *conn_retry_tmr; + char *sopath; + int (*notify_connect)(struct msg_client *client); + bool short_circuit_ok; +}; + +/* + * `notify_disconnect` is not called when `msg_client_cleanup` is called for a + * msg_client which is currently connected. The socket is closed but there is no + * notification. + */ +extern void msg_client_cleanup(struct msg_client *client); + +/* + * `notify_disconnect` is not called when the user `msg_client_cleanup` is + * called for a client which is currently connected. The socket is closed + * but there is no notification. + */ +extern void +msg_client_init(struct msg_client *client, struct event_loop *tm, + const char *sopath, + int (*notify_connect)(struct msg_client *client), + int (*notify_disconnect)(struct msg_conn *client), + void (*handle_msg)(uint8_t version, uint8_t *data, size_t len, + struct msg_conn *client), + size_t max_read_buf, size_t max_write_buf, size_t max_msg_sz, + bool short_circuit_ok, const char *idtag, bool debug); + +/* + * Server-side Connections + */ +#define MGMTD_MAX_CONN 32 + +PREDECL_LIST(msg_server_list); + +struct msg_server { + int fd; + struct msg_server_list_item link; + struct event_loop *loop; + struct event *listen_ev; + const char *sopath; + const char *idtag; + struct msg_conn *(*create)(int fd, union sockunion *su); + struct debug *debug; +}; + +extern int msg_server_init(struct msg_server *server, const char *sopath, + struct event_loop *loop, + struct msg_conn *(*create)(int fd, + union sockunion *su), + const char *idtag, struct debug *debug); +extern void msg_server_cleanup(struct msg_server *server); + +/* + * `notify_disconnect` is not called when the user `msg_conn_cleanup` is + * called for a client which is currently connected. The socket is closed + * but there is no notification. + */ +struct msg_conn * +msg_server_conn_create(struct event_loop *tm, int fd, + int (*notify_disconnect)(struct msg_conn *conn), + void (*handle_msg)(uint8_t version, uint8_t *data, + size_t len, struct msg_conn *conn), + size_t max_read, size_t max_write, size_t max_size, + void *user, const char *idtag); + +extern void msg_server_conn_delete(struct msg_conn *conn); + +extern void +msg_conn_accept_init(struct msg_conn *conn, struct event_loop *tm, int fd, + int (*notify_disconnect)(struct msg_conn *conn), + void (*handle_msg)(uint8_t version, uint8_t *data, + size_t len, struct msg_conn *conn), + size_t max_read, size_t max_write, size_t max_size, + const char *idtag); + +#endif /* _MGMT_MSG_H */ |