a3a54e251a
ntp 4.2.8p7. Security: CVE-2016-1547, CVE-2016-1548, CVE-2016-1549, CVE-2016-1550 Security: CVE-2016-1551, CVE-2016-2516, CVE-2016-2517, CVE-2016-2518 Security: CVE-2016-2519 Security: FreeBSD-SA-16:16.ntp With hat: so
198 lines
5.5 KiB
C
198 lines
5.5 KiB
C
/*
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* ntp_worker.h
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*/
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#ifndef NTP_WORKER_H
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#define NTP_WORKER_H
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#include "ntp_workimpl.h"
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#ifdef WORKER
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# if defined(WORK_THREAD) && defined(WORK_PIPE)
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# ifdef HAVE_SEMAPHORE_H
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# include <semaphore.h>
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# endif
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# endif
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#include "ntp_stdlib.h"
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/* #define TEST_BLOCKING_WORKER */ /* ntp_config.c ntp_intres.c */
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typedef enum blocking_work_req_tag {
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BLOCKING_GETNAMEINFO,
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BLOCKING_GETADDRINFO,
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} blocking_work_req;
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typedef void (*blocking_work_callback)(blocking_work_req, void *, size_t, void *);
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typedef enum blocking_magic_sig_e {
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BLOCKING_REQ_MAGIC = 0x510c7ecf,
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BLOCKING_RESP_MAGIC = 0x510c7e54,
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} blocking_magic_sig;
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/*
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* The same header is used for both requests to and responses from
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* the child. In the child, done_func and context are opaque.
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*/
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typedef struct blocking_pipe_header_tag {
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size_t octets;
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blocking_magic_sig magic_sig;
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blocking_work_req rtype;
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u_int child_idx;
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blocking_work_callback done_func;
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void * context;
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} blocking_pipe_header;
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# ifdef WORK_THREAD
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# ifdef SYS_WINNT
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typedef struct { HANDLE thnd; } thread_type;
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typedef struct { HANDLE shnd; } sema_type;
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# else
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typedef pthread_t thread_type;
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typedef sem_t sema_type;
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# endif
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typedef thread_type *thr_ref;
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typedef sema_type *sem_ref;
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# endif
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/*
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*
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*/
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#if defined(WORK_FORK)
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typedef struct blocking_child_tag {
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int reusable;
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int pid;
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int req_write_pipe; /* parent */
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int resp_read_pipe;
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void * resp_read_ctx;
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int req_read_pipe; /* child */
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int resp_write_pipe;
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int ispipe;
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volatile u_int resp_ready_seen; /* signal/scan */
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volatile u_int resp_ready_done; /* consumer/mainloop */
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} blocking_child;
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#elif defined(WORK_THREAD)
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typedef struct blocking_child_tag {
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/*
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* blocking workitems and blocking_responses are
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* dynamically-sized one-dimensional arrays of pointers to
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* blocking worker requests and responses.
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*
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* IMPORTANT: This structure is shared between threads, and all
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* access that is not atomic (especially queue operations) must
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* hold the 'accesslock' semaphore to avoid data races.
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*
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* The resource management (thread/semaphore
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* creation/destruction) functions and functions just testing a
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* handle are safe because these are only changed by the main
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* thread when no worker is running on the same data structure.
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*/
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int reusable;
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sem_ref accesslock; /* shared access lock */
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thr_ref thread_ref; /* thread 'handle' */
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/* the reuest queue */
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blocking_pipe_header ** volatile
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workitems;
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volatile size_t workitems_alloc;
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size_t head_workitem; /* parent */
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size_t tail_workitem; /* child */
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sem_ref workitems_pending; /* signalling */
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/* the response queue */
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blocking_pipe_header ** volatile
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responses;
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volatile size_t responses_alloc;
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size_t head_response; /* child */
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size_t tail_response; /* parent */
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/* event handles / sem_t pointers */
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sem_ref wake_scheduled_sleep;
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/* some systems use a pipe for notification, others a semaphore.
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* Both employ the queue above for the actual data transfer.
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*/
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#ifdef WORK_PIPE
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int resp_read_pipe; /* parent */
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int resp_write_pipe; /* child */
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int ispipe;
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void * resp_read_ctx; /* child */
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#else
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sem_ref responses_pending; /* signalling */
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#endif
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volatile u_int resp_ready_seen; /* signal/scan */
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volatile u_int resp_ready_done; /* consumer/mainloop */
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sema_type sem_table[4];
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thread_type thr_table[1];
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} blocking_child;
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#endif /* WORK_THREAD */
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/* we need some global tag to indicate any blocking child may be ready: */
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extern volatile u_int blocking_child_ready_seen;/* signal/scan */
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extern volatile u_int blocking_child_ready_done;/* consumer/mainloop */
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extern blocking_child ** blocking_children;
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extern size_t blocking_children_alloc;
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extern int worker_per_query; /* boolean */
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extern int intres_req_pending;
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extern u_int available_blocking_child_slot(void);
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extern int queue_blocking_request(blocking_work_req, void *,
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size_t, blocking_work_callback,
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void *);
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extern int queue_blocking_response(blocking_child *,
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blocking_pipe_header *, size_t,
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const blocking_pipe_header *);
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extern void process_blocking_resp(blocking_child *);
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extern void harvest_blocking_responses(void);
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extern int send_blocking_req_internal(blocking_child *,
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blocking_pipe_header *,
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void *);
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extern int send_blocking_resp_internal(blocking_child *,
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blocking_pipe_header *);
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extern blocking_pipe_header *
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receive_blocking_req_internal(blocking_child *);
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extern blocking_pipe_header *
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receive_blocking_resp_internal(blocking_child *);
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extern int blocking_child_common(blocking_child *);
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extern void exit_worker(int)
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__attribute__ ((__noreturn__));
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extern int worker_sleep(blocking_child *, time_t);
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extern void worker_idle_timer_fired(void);
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extern void interrupt_worker_sleep(void);
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extern int req_child_exit(blocking_child *);
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#ifndef HAVE_IO_COMPLETION_PORT
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extern int pipe_socketpair(int fds[2], int *is_pipe);
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extern void close_all_beyond(int);
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extern void close_all_except(int);
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extern void kill_asyncio (int);
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#endif
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extern void worker_global_lock(int inOrOut);
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# ifdef WORK_PIPE
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typedef void (*addremove_io_fd_func)(int, int, int);
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extern addremove_io_fd_func addremove_io_fd;
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# else
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extern void handle_blocking_resp_sem(void *);
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typedef void (*addremove_io_semaphore_func)(sem_ref, int);
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extern addremove_io_semaphore_func addremove_io_semaphore;
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# endif
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# ifdef WORK_FORK
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extern int worker_process;
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# endif
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#endif /* WORKER */
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#if defined(HAVE_DROPROOT) && defined(WORK_FORK)
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extern void fork_deferred_worker(void);
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#else
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# define fork_deferred_worker() do {} while (0)
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#endif
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#endif /* !NTP_WORKER_H */
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