util.h

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/*
 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef EVENT2_UTIL_H_INCLUDED_
#define EVENT2_UTIL_H_INCLUDED_

#include <event2/visibility.h>

#ifdef __cplusplus
extern "C" {
#endif

#include <event2/event-config.h>
#ifdef EVENT__HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef EVENT__HAVE_STDINT_H
#include <stdint.h>
#elif defined(EVENT__HAVE_INTTYPES_H)
#include <inttypes.h>
#endif
#ifdef EVENT__HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef EVENT__HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifdef _MSC_VER
#include <BaseTsd.h>
#endif
#include <stdarg.h>
#ifdef EVENT__HAVE_NETDB_H
#if !defined(_GNU_SOURCE)
#define _GNU_SOURCE
#endif
#include <netdb.h>
#endif

#ifdef _WIN32
#include <winsock2.h>
#ifdef EVENT__HAVE_GETADDRINFO
/* for EAI_* definitions. */
#include <ws2tcpip.h>
#endif
#else
#ifdef EVENT__HAVE_ERRNO_H
#include <errno.h>
#endif
#include <sys/socket.h>
#endif

#include <time.h>

/* Some openbsd autoconf versions get the name of this macro wrong. */
#if defined(EVENT__SIZEOF_VOID__) && !defined(EVENT__SIZEOF_VOID_P)
#define EVENT__SIZEOF_VOID_P EVENT__SIZEOF_VOID__
#endif

#ifdef EVENT__HAVE_UINT64_T
#define ev_uint64_t uint64_t
#define ev_int64_t int64_t
#elif defined(_WIN32)
#define ev_uint64_t unsigned __int64
#define ev_int64_t signed __int64
#elif EVENT__SIZEOF_LONG_LONG == 8
#define ev_uint64_t unsigned long long
#define ev_int64_t long long
#elif EVENT__SIZEOF_LONG == 8
#define ev_uint64_t unsigned long
#define ev_int64_t long
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_uint64_t ...
#define ev_int64_t ...
#else
#error "No way to define ev_uint64_t"
#endif

#ifdef EVENT__HAVE_UINT32_T
#define ev_uint32_t uint32_t
#define ev_int32_t int32_t
#elif defined(_WIN32)
#define ev_uint32_t unsigned int
#define ev_int32_t signed int
#elif EVENT__SIZEOF_LONG == 4
#define ev_uint32_t unsigned long
#define ev_int32_t signed long
#elif EVENT__SIZEOF_INT == 4
#define ev_uint32_t unsigned int
#define ev_int32_t signed int
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_uint32_t ...
#define ev_int32_t ...
#else
#error "No way to define ev_uint32_t"
#endif

#ifdef EVENT__HAVE_UINT16_T
#define ev_uint16_t uint16_t
#define ev_int16_t  int16_t
#elif defined(_WIN32)
#define ev_uint16_t unsigned short
#define ev_int16_t  signed short
#elif EVENT__SIZEOF_INT == 2
#define ev_uint16_t unsigned int
#define ev_int16_t  signed int
#elif EVENT__SIZEOF_SHORT == 2
#define ev_uint16_t unsigned short
#define ev_int16_t  signed short
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_uint16_t ...
#define ev_int16_t ...
#else
#error "No way to define ev_uint16_t"
#endif

#ifdef EVENT__HAVE_UINT8_T
#define ev_uint8_t uint8_t
#define ev_int8_t int8_t
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_uint8_t ...
#define ev_int8_t ...
#else
#define ev_uint8_t unsigned char
#define ev_int8_t signed char
#endif

#ifdef EVENT__HAVE_UINTPTR_T
#define ev_uintptr_t uintptr_t
#define ev_intptr_t intptr_t
#elif EVENT__SIZEOF_VOID_P <= 4
#define ev_uintptr_t ev_uint32_t
#define ev_intptr_t ev_int32_t
#elif EVENT__SIZEOF_VOID_P <= 8
#define ev_uintptr_t ev_uint64_t
#define ev_intptr_t ev_int64_t
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_uintptr_t ...
#define ev_intptr_t ...
#else
#error "No way to define ev_uintptr_t"
#endif

#ifdef EVENT__ssize_t
#define ev_ssize_t EVENT__ssize_t
#else
#define ev_ssize_t ssize_t
#endif

/* Note that we define ev_off_t based on the compile-time size of off_t that
 * we used to build Libevent, and not based on the current size of off_t.
 * (For example, we don't define ev_off_t to off_t.).  We do this because
 * some systems let you build your software with different off_t sizes
 * at runtime, and so putting in any dependency on off_t would risk API
 * mismatch.
 */
#ifdef _WIN32
#define ev_off_t ev_int64_t
#elif EVENT__SIZEOF_OFF_T == 8
#define ev_off_t ev_int64_t
#elif EVENT__SIZEOF_OFF_T == 4
#define ev_off_t ev_int32_t
#elif defined(EVENT_IN_DOXYGEN_)
#define ev_off_t ...
#else
#define ev_off_t off_t
#endif

/* Limits for integer types.

   We're making two assumptions here:
     - The compiler does constant folding properly.
     - The platform does signed arithmetic in two's complement.
*/

#ifndef EVENT__HAVE_STDINT_H
#define EV_UINT64_MAX ((((ev_uint64_t)0xffffffffUL) << 32) | 0xffffffffUL)
#define EV_INT64_MAX  ((((ev_int64_t) 0x7fffffffL) << 32) | 0xffffffffL)
#define EV_INT64_MIN  ((-EV_INT64_MAX) - 1)
#define EV_UINT32_MAX ((ev_uint32_t)0xffffffffUL)
#define EV_INT32_MAX  ((ev_int32_t) 0x7fffffffL)
#define EV_INT32_MIN  ((-EV_INT32_MAX) - 1)
#define EV_UINT16_MAX ((ev_uint16_t)0xffffUL)
#define EV_INT16_MAX  ((ev_int16_t) 0x7fffL)
#define EV_INT16_MIN  ((-EV_INT16_MAX) - 1)
#define EV_UINT8_MAX  255
#define EV_INT8_MAX   127
#define EV_INT8_MIN   ((-EV_INT8_MAX) - 1)
#else
#define EV_UINT64_MAX UINT64_MAX
#define EV_INT64_MAX  INT64_MAX
#define EV_INT64_MIN  INT64_MIN
#define EV_UINT32_MAX UINT32_MAX
#define EV_INT32_MAX  INT32_MAX
#define EV_INT32_MIN  INT32_MIN
#define EV_UINT16_MAX UINT16_MAX
#define EV_INT16_MAX  INT16_MAX
#define EV_UINT8_MAX  UINT8_MAX
#define EV_INT8_MAX   INT8_MAX
#define EV_INT8_MIN   INT8_MIN

#endif


#if EVENT__SIZEOF_SIZE_T == 8
#define EV_SIZE_MAX EV_UINT64_MAX
#define EV_SSIZE_MAX EV_INT64_MAX
#elif EVENT__SIZEOF_SIZE_T == 4
#define EV_SIZE_MAX EV_UINT32_MAX
#define EV_SSIZE_MAX EV_INT32_MAX
#elif defined(EVENT_IN_DOXYGEN_)
#define EV_SIZE_MAX ...
#define EV_SSIZE_MAX ...
#else
#error "No way to define SIZE_MAX"
#endif

#define EV_SSIZE_MIN ((-EV_SSIZE_MAX) - 1)

#ifdef _WIN32
#define ev_socklen_t int
#elif defined(EVENT__socklen_t)
#define ev_socklen_t EVENT__socklen_t
#else
#define ev_socklen_t socklen_t
#endif

#ifdef EVENT__HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY
#if !defined(EVENT__HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY) \
 && !defined(ss_family)
#define ss_family __ss_family
#endif
#endif

#ifdef _WIN32
#define evutil_socket_t intptr_t
#else
#define evutil_socket_t int
#endif

struct evutil_monotonic_timer
#ifdef EVENT_IN_DOXYGEN_
{/*Empty body so that doxygen will generate documentation here.*/}
#endif
;

#define EV_MONOT_PRECISE  1
#define EV_MONOT_FALLBACK 2

EVENT2_EXPORT_SYMBOL int
evutil_date_rfc1123(char *date, const size_t datelen, const struct tm *tm);

EVENT2_EXPORT_SYMBOL
struct evutil_monotonic_timer * evutil_monotonic_timer_new(void);

EVENT2_EXPORT_SYMBOL
void evutil_monotonic_timer_free(struct evutil_monotonic_timer *timer);

EVENT2_EXPORT_SYMBOL
int evutil_configure_monotonic_time(struct evutil_monotonic_timer *timer,
                                    int flags);

EVENT2_EXPORT_SYMBOL
int evutil_gettime_monotonic(struct evutil_monotonic_timer *timer,
                             struct timeval *tp);

EVENT2_EXPORT_SYMBOL
int evutil_socketpair(int d, int type, int protocol, evutil_socket_t sv[2]);
EVENT2_EXPORT_SYMBOL
int evutil_make_socket_nonblocking(evutil_socket_t sock);

EVENT2_EXPORT_SYMBOL
int evutil_make_listen_socket_reuseable(evutil_socket_t sock);

EVENT2_EXPORT_SYMBOL
int evutil_make_listen_socket_reuseable_port(evutil_socket_t sock);

EVENT2_EXPORT_SYMBOL
int evutil_make_socket_closeonexec(evutil_socket_t sock);

EVENT2_EXPORT_SYMBOL
int evutil_closesocket(evutil_socket_t sock);
#define EVUTIL_CLOSESOCKET(s) evutil_closesocket(s)

EVENT2_EXPORT_SYMBOL
int evutil_make_tcp_listen_socket_deferred(evutil_socket_t sock);

#ifdef _WIN32

#define EVUTIL_SOCKET_ERROR() WSAGetLastError()

#define EVUTIL_SET_SOCKET_ERROR(errcode)        \
    do { WSASetLastError(errcode); } while (0)

EVENT2_EXPORT_SYMBOL
int evutil_socket_geterror(evutil_socket_t sock);
EVENT2_EXPORT_SYMBOL
const char *evutil_socket_error_to_string(int errcode);
#elif defined(EVENT_IN_DOXYGEN_)

#define EVUTIL_SOCKET_ERROR() ...

#define EVUTIL_SET_SOCKET_ERROR(errcode) ...

#define evutil_socket_geterror(sock) ...

#define evutil_socket_error_to_string(errcode) ...

#else
#define EVUTIL_SOCKET_ERROR() (errno)
#define EVUTIL_SET_SOCKET_ERROR(errcode)        \
        do { errno = (errcode); } while (0)
#define evutil_socket_geterror(sock) (errno)
#define evutil_socket_error_to_string(errcode) (strerror(errcode))
#endif


#ifdef EVENT__HAVE_TIMERADD
#define evutil_timeradd(tvp, uvp, vvp) timeradd((tvp), (uvp), (vvp))
#define evutil_timersub(tvp, uvp, vvp) timersub((tvp), (uvp), (vvp))
#else
#define evutil_timeradd(tvp, uvp, vvp)                  \
    do {                                \
        (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;      \
        (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
        if ((vvp)->tv_usec >= 1000000) {            \
            (vvp)->tv_sec++;                \
            (vvp)->tv_usec -= 1000000;          \
        }                           \
    } while (0)
#define evutil_timersub(tvp, uvp, vvp)                  \
    do {                                \
        (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;      \
        (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;   \
        if ((vvp)->tv_usec < 0) {               \
            (vvp)->tv_sec--;                \
            (vvp)->tv_usec += 1000000;          \
        }                           \
    } while (0)
#endif /* !EVENT__HAVE_TIMERADD */

#ifdef EVENT__HAVE_TIMERCLEAR
#define evutil_timerclear(tvp) timerclear(tvp)
#else
#define evutil_timerclear(tvp)  (tvp)->tv_sec = (tvp)->tv_usec = 0
#endif

#define evutil_timercmp(tvp, uvp, cmp)                  \
    (((tvp)->tv_sec == (uvp)->tv_sec) ?             \
     ((tvp)->tv_usec cmp (uvp)->tv_usec) :              \
     ((tvp)->tv_sec cmp (uvp)->tv_sec))

#ifdef EVENT__HAVE_TIMERISSET
#define evutil_timerisset(tvp) timerisset(tvp)
#else
#define evutil_timerisset(tvp)  ((tvp)->tv_sec || (tvp)->tv_usec)
#endif

#ifdef offsetof
#define evutil_offsetof(type, field) offsetof(type, field)
#else
#define evutil_offsetof(type, field) ((off_t)(&((type *)0)->field))
#endif

/* big-int related functions */
EVENT2_EXPORT_SYMBOL
ev_int64_t evutil_strtoll(const char *s, char **endptr, int base);

#ifdef EVENT__HAVE_GETTIMEOFDAY
#define evutil_gettimeofday(tv, tz) gettimeofday((tv), (tz))
#else
struct timezone;
EVENT2_EXPORT_SYMBOL
int evutil_gettimeofday(struct timeval *tv, struct timezone *tz);
#endif

EVENT2_EXPORT_SYMBOL
int evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
#ifdef __GNUC__
    __attribute__((format(printf, 3, 4)))
#endif
;
EVENT2_EXPORT_SYMBOL
int evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
#ifdef __GNUC__
    __attribute__((format(printf, 3, 0)))
#endif
;

EVENT2_EXPORT_SYMBOL
const char *evutil_inet_ntop(int af, const void *src, char *dst, size_t len);
EVENT2_EXPORT_SYMBOL
int evutil_inet_pton(int af, const char *src, void *dst);
struct sockaddr;

EVENT2_EXPORT_SYMBOL
int evutil_parse_sockaddr_port(const char *str, struct sockaddr *out, int *outlen);

EVENT2_EXPORT_SYMBOL
int evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
    int include_port);

EVENT2_EXPORT_SYMBOL
int evutil_ascii_strcasecmp(const char *str1, const char *str2);
EVENT2_EXPORT_SYMBOL
int evutil_ascii_strncasecmp(const char *str1, const char *str2, size_t n);

/* Here we define evutil_addrinfo to the native addrinfo type, or redefine it
 * if this system has no getaddrinfo(). */
#ifdef EVENT__HAVE_STRUCT_ADDRINFO
#define evutil_addrinfo addrinfo
#else

struct evutil_addrinfo {
    int     ai_flags;     /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
    int     ai_family;    /* PF_xxx */
    int     ai_socktype;  /* SOCK_xxx */
    int     ai_protocol;  /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
    size_t  ai_addrlen;   /* length of ai_addr */
    char   *ai_canonname; /* canonical name for nodename */
    struct sockaddr  *ai_addr; /* binary address */
    struct evutil_addrinfo  *ai_next; /* next structure in linked list */
};
#endif

#if defined(EAI_ADDRFAMILY) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_ADDRFAMILY EAI_ADDRFAMILY
#else
#define EVUTIL_EAI_ADDRFAMILY -901
#endif
#if defined(EAI_AGAIN) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_AGAIN EAI_AGAIN
#else
#define EVUTIL_EAI_AGAIN -902
#endif
#if defined(EAI_BADFLAGS) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_BADFLAGS EAI_BADFLAGS
#else
#define EVUTIL_EAI_BADFLAGS -903
#endif
#if defined(EAI_FAIL) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_FAIL EAI_FAIL
#else
#define EVUTIL_EAI_FAIL -904
#endif
#if defined(EAI_FAMILY) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_FAMILY EAI_FAMILY
#else
#define EVUTIL_EAI_FAMILY -905
#endif
#if defined(EAI_MEMORY) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_MEMORY EAI_MEMORY
#else
#define EVUTIL_EAI_MEMORY -906
#endif
/* This test is a bit complicated, since some MS SDKs decide to
 * remove NODATA or redefine it to be the same as NONAME, in a
 * fun interpretation of RFC 2553 and RFC 3493. */
#if defined(EAI_NODATA) && defined(EVENT__HAVE_GETADDRINFO) && (!defined(EAI_NONAME) || EAI_NODATA != EAI_NONAME)
#define EVUTIL_EAI_NODATA EAI_NODATA
#else
#define EVUTIL_EAI_NODATA -907
#endif
#if defined(EAI_NONAME) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_NONAME EAI_NONAME
#else
#define EVUTIL_EAI_NONAME -908
#endif
#if defined(EAI_SERVICE) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_SERVICE EAI_SERVICE
#else
#define EVUTIL_EAI_SERVICE -909
#endif
#if defined(EAI_SOCKTYPE) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_SOCKTYPE EAI_SOCKTYPE
#else
#define EVUTIL_EAI_SOCKTYPE -910
#endif
#if defined(EAI_SYSTEM) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_EAI_SYSTEM EAI_SYSTEM
#else
#define EVUTIL_EAI_SYSTEM -911
#endif

#define EVUTIL_EAI_CANCEL -90001

#if defined(AI_PASSIVE) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_PASSIVE AI_PASSIVE
#else
#define EVUTIL_AI_PASSIVE 0x1000
#endif
#if defined(AI_CANONNAME) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_CANONNAME AI_CANONNAME
#else
#define EVUTIL_AI_CANONNAME 0x2000
#endif
#if defined(AI_NUMERICHOST) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_NUMERICHOST AI_NUMERICHOST
#else
#define EVUTIL_AI_NUMERICHOST 0x4000
#endif
#if defined(AI_NUMERICSERV) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_NUMERICSERV AI_NUMERICSERV
#else
#define EVUTIL_AI_NUMERICSERV 0x8000
#endif
#if defined(AI_V4MAPPED) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_V4MAPPED AI_V4MAPPED
#else
#define EVUTIL_AI_V4MAPPED 0x10000
#endif
#if defined(AI_ALL) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_ALL AI_ALL
#else
#define EVUTIL_AI_ALL 0x20000
#endif
#if defined(AI_ADDRCONFIG) && defined(EVENT__HAVE_GETADDRINFO)
#define EVUTIL_AI_ADDRCONFIG AI_ADDRCONFIG
#else
#define EVUTIL_AI_ADDRCONFIG 0x40000
#endif

struct evutil_addrinfo;
EVENT2_EXPORT_SYMBOL
int evutil_getaddrinfo(const char *nodename, const char *servname,
    const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res);

EVENT2_EXPORT_SYMBOL
void evutil_freeaddrinfo(struct evutil_addrinfo *ai);

EVENT2_EXPORT_SYMBOL
const char *evutil_gai_strerror(int err);

EVENT2_EXPORT_SYMBOL
void evutil_secure_rng_get_bytes(void *buf, size_t n);

EVENT2_EXPORT_SYMBOL
int evutil_secure_rng_init(void);

EVENT2_EXPORT_SYMBOL
int evutil_secure_rng_set_urandom_device_file(char *fname);

EVENT2_EXPORT_SYMBOL
void evutil_secure_rng_add_bytes(const char *dat, size_t datlen);

#ifdef __cplusplus
}
#endif

#endif /* EVENT1_EVUTIL_H_INCLUDED_ */