evutil.c

/*
 * Copyright (c) 2007 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef WIN32
#include <winsock2.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#endif

#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <errno.h>
#if defined WIN32 && !defined(HAVE_GETTIMEOFDAY_H)
#include <sys/timeb.h>
#endif
#include <stdio.h>

#include "evutil.h"
#include "log.h"

int
evutil_socketpair(int family, int type, int protocol, int fd[2])
{
#ifndef WIN32
        return socketpair(family, type, protocol, fd);
#else
        /* This code is originally from Tor.  Used with permission. */

        /* This socketpair does not work when localhost is down. So
         * it's really not the same thing at all. But it's close enough
         * for now, and really, when localhost is down sometimes, we
         * have other problems too.
         */
        int listener = -1;
        int connector = -1;
        int acceptor = -1;
        struct sockaddr_in listen_addr;
        struct sockaddr_in connect_addr;
        int size;
        int saved_errno = -1;

        if (protocol
#ifdef AF_UNIX
                || family != AF_UNIX
#endif
                ) {
                EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
                return -1;
        }
        if (!fd) {
                EVUTIL_SET_SOCKET_ERROR(WSAEINVAL);
                return -1;
        }

        listener = socket(AF_INET, type, 0);
        if (listener < 0)
                return -1;
        memset(&listen_addr, 0, sizeof(listen_addr));
        listen_addr.sin_family = AF_INET;
        listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        listen_addr.sin_port = 0;       /* kernel chooses port.  */
        if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
                == -1)
                goto tidy_up_and_fail;
        if (listen(listener, 1) == -1)
                goto tidy_up_and_fail;

        connector = socket(AF_INET, type, 0);
        if (connector < 0)
                goto tidy_up_and_fail;
        /* We want to find out the port number to connect to.  */
        size = sizeof(connect_addr);
        if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
                goto tidy_up_and_fail;
        if (size != sizeof (connect_addr))
                goto abort_tidy_up_and_fail;
        if (connect(connector, (struct sockaddr *) &connect_addr,
                                sizeof(connect_addr)) == -1)
                goto tidy_up_and_fail;

        size = sizeof(listen_addr);
        acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
        if (acceptor < 0)
                goto tidy_up_and_fail;
        if (size != sizeof(listen_addr))
                goto abort_tidy_up_and_fail;
        EVUTIL_CLOSESOCKET(listener);
        /* Now check we are talking to ourself by matching port and host on the
           two sockets.  */
        if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
                goto tidy_up_and_fail;
        if (size != sizeof (connect_addr)
                || listen_addr.sin_family != connect_addr.sin_family
                || listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr
                || listen_addr.sin_port != connect_addr.sin_port)
                goto abort_tidy_up_and_fail;
        fd[0] = connector;
        fd[1] = acceptor;

        return 0;

 abort_tidy_up_and_fail:
        saved_errno = WSAECONNABORTED;
 tidy_up_and_fail:
        if (saved_errno < 0)
                saved_errno = WSAGetLastError();
        if (listener != -1)
                EVUTIL_CLOSESOCKET(listener);
        if (connector != -1)
                EVUTIL_CLOSESOCKET(connector);
        if (acceptor != -1)
                EVUTIL_CLOSESOCKET(acceptor);

        EVUTIL_SET_SOCKET_ERROR(saved_errno);
        return -1;
#endif
}

int
evutil_make_socket_nonblocking(int fd)
{
#ifdef WIN32
        {
                unsigned long nonblocking = 1;
                ioctlsocket(fd, FIONBIO, (unsigned long*) &nonblocking);
        }
#else
        if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
                event_warn("fcntl(O_NONBLOCK)");
                return -1;
}       
#endif
        return 0;
}

ev_int64_t
evutil_strtoll(const char *s, char **endptr, int base)
{
#ifdef HAVE_STRTOLL
        return (ev_int64_t)strtoll(s, endptr, base);
#elif SIZEOF_LONG == 8
        return (ev_int64_t)strtol(s, endptr, base);
#elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300
        /* XXXX on old versions of MS APIs, we only support base
         * 10. */
        ev_int64_t r;
        if (base != 10)
                return 0;
        r = (ev_int64_t) _atoi64(s);
        while (isspace(*s))
                ++s;
        while (isdigit(*s))
                ++s;
        if (endptr)
                *endptr = (char*) s;
        return r;
#elif defined(WIN32)
        return (ev_int64_t) _strtoi64(s, endptr, base);
#else
#error "I don't know how to parse 64-bit integers."
#endif
}

#ifndef HAVE_GETTIMEOFDAY
int
evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
{
        struct _timeb tb;

        if(tv == NULL)
                return -1;

        _ftime(&tb);
        tv->tv_sec = (long) tb.time;
        tv->tv_usec = ((int) tb.millitm) * 1000;
        return 0;
}
#endif

int
evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
{
        int r;
        va_list ap;
        va_start(ap, format);
        r = evutil_vsnprintf(buf, buflen, format, ap);
        va_end(ap);
        return r;
}

int
evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
{
#ifdef _MSC_VER
        int r = _vsnprintf(buf, buflen, format, ap);
        buf[buflen-1] = '\0';
        if (r >= 0)
                return r;
        else
                return _vscprintf(format, ap);
#else
        int r = vsnprintf(buf, buflen, format, ap);
        buf[buflen-1] = '\0';
        return r;
#endif
}