lws-stub.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2026 Andy Green <andy@warmcat.com>
 *
 * 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.
 *
 * lws_stub - generalized API for spawning and communicating with root stubs
 * via UDS and JSON-RPC
 */
 
#ifndef _LWS_STUB_H
#define _LWS_STUB_H
 
#if defined(LWS_WITH_STUB)
 
struct lws_stub_manager;
 
/*
 * Opaque handle for one queued request, valid until the request is retired.
 * Zero is never a valid handle, and handles are never reused, so a handle
 * kept after its request was retired is simply dead and safe to pass to
 * lws_stub_request_cancel().
 */
typedef uint64_t lws_stub_req_h;
 
struct lws_stub_config {
        struct lws_context              *cx;
        struct lws_vhost                *vh;
        const char                      *stub_name;             /* e.g. "distribution-client" */
        const char                      *uds_path;              /* e.g. "/var/run/lws-cert-dist-stub.sock" */
        const struct lws_protocols      *protocols;             /* Protocol array for the UDS server vhost */
        const void                      *extra_payload;         /* Optional extra data to write to child stdin */
        size_t                          extra_payload_len;
        void                            *user;                  /* Opaque user pointer passed to vhost */
        void (*connected_cb)(struct lws_stub_manager *mgr);     /* Called when UDS connects */
        void (*parent_gone_cb)(void *user);                     /* Stub process side only: called when the
                                                                 * stub is about to exit autonomously
                                                                 * because its parent died (or SIGTERM was
                                                                 * received and no app handler was
                                                                 * installed), just before the UDS socket
                                                                 * is unlinked and the process exits.  This
                                                                 * is the stub's last chance to clean up
                                                                 * or persist its own state. */
        const char                      *parent_protocol_name;  /* Protocol to bind parent pipes to.  If set, this
                                                                 * protocol must call lws_spawn_stdwsi_closed()
                                                                 * with lws_stub_get_lsp(mgr) from its
                                                                 * LWS_CALLBACK_RAW_CLOSE_FILE handler. */
};
 
struct lws_stub_manager;

LWS_VISIBLE LWS_EXTERN struct lws_stub_manager *
lws_stub_spawn(const struct lws_stub_config *config);

LWS_VISIBLE LWS_EXTERN int
lws_stub_server_init(const struct lws_stub_config *config, char *secret_out, void *extra_out, size_t extra_len);

LWS_VISIBLE LWS_EXTERN int
lws_stub_request(struct lws_stub_manager *mgr,
                 const char *json,
                 const char * const *rx_paths,
                 size_t rx_paths_count,
                 signed char (*rx_cb)(struct lejp_ctx *ctx, char reason),
                 void (*raw_cb)(const char *in, size_t len, void *user),
                 void *user);

LWS_VISIBLE LWS_EXTERN lws_stub_req_h
lws_stub_request_h(struct lws_stub_manager *mgr,
                   const char *json,
                   const char * const *rx_paths,
                   size_t rx_paths_count,
                   signed char (*rx_cb)(struct lejp_ctx *ctx, char reason),
                   void (*raw_cb)(const char *in, size_t len, void *user),
                   void *user);

LWS_VISIBLE LWS_EXTERN void
lws_stub_request_cancel(struct lws_stub_manager *mgr, lws_stub_req_h h);

LWS_VISIBLE LWS_EXTERN void
lws_stub_destroy(struct lws_stub_manager **_mgr);

LWS_VISIBLE LWS_EXTERN const char *
lws_stub_get_secret(struct lws_stub_manager *mgr);

LWS_VISIBLE LWS_EXTERN struct lws_spawn_piped *
lws_stub_get_lsp(struct lws_stub_manager *mgr);
 
 
LWS_VISIBLE LWS_EXTERN int
lws_callback_stub_client(struct lws *wsi, enum lws_callback_reasons reason,
                     void *user, void *in, size_t len);
 
#endif /* LWS_WITH_STUB */
 
#endif /* _LWS_STUB_H */