lws-fault-injection.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2021 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.
 *
 * Fault injection api if built with LWS_WITH_SYS_FAULT_INJECTION
 */
 
typedef struct lws_xos {
        uint64_t s[4];
} lws_xos_t;

LWS_VISIBLE LWS_EXTERN void
lws_xos_init(struct lws_xos *xos, uint64_t seed);

LWS_VISIBLE LWS_EXTERN uint64_t LWS_WARN_UNUSED_RESULT
lws_xos(struct lws_xos *xos);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_xos_percent(struct lws_xos *xos, int percent);
 
#if defined(LWS_WITH_SYS_FAULT_INJECTION)
 
enum {
        LWSFI_ALWAYS,
        LWSFI_DETERMINISTIC,    /* do .count injections after .pre then stop */
        LWSFI_PROBABILISTIC,    /* .pre % chance of injection */
        LWSFI_PATTERN,          /* use .count bits in .pattern after .pre */
        LWSFI_PATTERN_ALLOC,    /* as _PATTERN, but .pattern is malloc'd */
        LWSFI_RANGE             /* pick a number between pre and count */
};
 
typedef struct lws_fi {
        const char              *name;
        const uint8_t           *pattern;
        uint64_t                pre;
        uint64_t                count;
        uint64_t                times;          /* start at 0, tracks usage */
        char                    type;           /* LWSFI_* */
} lws_fi_t;
 
typedef struct lws_fi_ctx {
        lws_dll2_owner_t        fi_owner;
        struct lws_xos          xos;
        const char              *name;
} lws_fi_ctx_t;

LWS_VISIBLE LWS_EXTERN int
lws_fi(const lws_fi_ctx_t *fic, const char *fi_name);

LWS_VISIBLE LWS_EXTERN int
lws_fi_range(const lws_fi_ctx_t *fic, const char *name, uint64_t *result);

LWS_VISIBLE LWS_EXTERN int
lws_fi_add(lws_fi_ctx_t *fic, const lws_fi_t *fi);

LWS_VISIBLE LWS_EXTERN void
lws_fi_remove(lws_fi_ctx_t *fic, const char *name);

LWS_VISIBLE LWS_EXTERN void
lws_fi_import(lws_fi_ctx_t *fic_dest, const lws_fi_ctx_t *fic_src);

LWS_VISIBLE LWS_EXTERN void
lws_fi_inherit_copy(lws_fi_ctx_t *fic_dest, const lws_fi_ctx_t *fic_src,
                    const char *scope, const char *value);

LWS_VISIBLE LWS_EXTERN void
lws_fi_destroy(const lws_fi_ctx_t *fic);

 
LWS_VISIBLE LWS_EXTERN void
lws_fi_deserialize(lws_fi_ctx_t *fic, const char *sers);
 
LWS_VISIBLE LWS_EXTERN int
_lws_fi_user_wsi_fi(struct lws *wsi, const char *name);
LWS_VISIBLE LWS_EXTERN int
_lws_fi_user_context_fi(struct lws_context *ctx, const char *name);
 
#if defined(LWS_WITH_SECURE_STREAMS)
struct lws_ss_handle;
LWS_VISIBLE LWS_EXTERN int
_lws_fi_user_ss_fi(struct lws_ss_handle *h, const char *name);
#if defined(LWS_WITH_SECURE_STREAMS_PROXY_API)
struct lws_sspc_handle;
LWS_VISIBLE LWS_EXTERN int
_lws_fi_user_sspc_fi(struct lws_sspc_handle *h, const char *name);
#endif
#endif
 
#define lws_fi_user_wsi_fi(_wsi, _name) _lws_fi_user_wsi_fi(_wsi, _name)
#define lws_fi_user_context_fi(_ctx, _name) _lws_fi_user_context_fi(_ctx, _name)
#define lws_fi_user_ss_fi(_h, _name) _lws_fi_user_ss_fi(_h, _name)
#define lws_fi_user_sspc_fi(_h, _name) _lws_fi_user_sspc_fi(_h, _name)
 
#else
 
/*
 * Helper so we can leave lws_fi() calls embedded in the code being tested,
 * if fault injection is not enabled then it just always says "no" at buildtime.
 */
 
#define lws_fi(_fi_name, _fic) (0)
#define lws_fi_destroy(_x)
#define lws_fi_inherit_copy(_a, _b, _c, _d)
#define lws_fi_deserialize(_x, _y)
#define lws_fi_user_wsi_fi(_wsi, _name) (0)
#define lws_fi_user_context_fi(_wsi, _name) (0)
#define lws_fi_user_ss_fi(_h, _name) (0)
#define lws_fi_user_sspc_fi(_h, _name) (0)
 
#endif