278 lines
6.8 KiB
C
278 lines
6.8 KiB
C
/*
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* Copyright (c) 2007 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef WIN32
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#include <winsock2.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#endif
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <errno.h>
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#if defined WIN32 && !defined(HAVE_GETTIMEOFDAY_H)
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#include <sys/timeb.h>
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#endif
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#include <stdio.h>
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#include <signal.h>
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#include <sys/queue.h>
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#include "event.h"
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#include "event-internal.h"
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#include "evutil.h"
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#include "log.h"
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int
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evutil_socketpair(int family, int type, int protocol, int fd[2])
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{
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#ifndef WIN32
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return socketpair(family, type, protocol, fd);
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#else
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/* This code is originally from Tor. Used with permission. */
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/* This socketpair does not work when localhost is down. So
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* it's really not the same thing at all. But it's close enough
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* for now, and really, when localhost is down sometimes, we
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* have other problems too.
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*/
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int listener = -1;
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int connector = -1;
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int acceptor = -1;
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struct sockaddr_in listen_addr;
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struct sockaddr_in connect_addr;
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int size;
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int saved_errno = -1;
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if (protocol
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#ifdef AF_UNIX
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|| family != AF_UNIX
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#endif
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) {
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EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
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return -1;
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}
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if (!fd) {
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EVUTIL_SET_SOCKET_ERROR(WSAEINVAL);
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return -1;
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}
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listener = socket(AF_INET, type, 0);
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if (listener < 0)
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return -1;
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memset(&listen_addr, 0, sizeof(listen_addr));
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listen_addr.sin_family = AF_INET;
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listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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listen_addr.sin_port = 0; /* kernel chooses port. */
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if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
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== -1)
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goto tidy_up_and_fail;
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if (listen(listener, 1) == -1)
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goto tidy_up_and_fail;
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connector = socket(AF_INET, type, 0);
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if (connector < 0)
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goto tidy_up_and_fail;
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/* We want to find out the port number to connect to. */
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size = sizeof(connect_addr);
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if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
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goto tidy_up_and_fail;
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if (size != sizeof (connect_addr))
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goto abort_tidy_up_and_fail;
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if (connect(connector, (struct sockaddr *) &connect_addr,
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sizeof(connect_addr)) == -1)
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goto tidy_up_and_fail;
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size = sizeof(listen_addr);
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acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
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if (acceptor < 0)
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goto tidy_up_and_fail;
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if (size != sizeof(listen_addr))
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goto abort_tidy_up_and_fail;
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EVUTIL_CLOSESOCKET(listener);
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/* Now check we are talking to ourself by matching port and host on the
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two sockets. */
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if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
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goto tidy_up_and_fail;
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if (size != sizeof (connect_addr)
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|| listen_addr.sin_family != connect_addr.sin_family
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|| listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr
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|| listen_addr.sin_port != connect_addr.sin_port)
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goto abort_tidy_up_and_fail;
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fd[0] = connector;
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fd[1] = acceptor;
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return 0;
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abort_tidy_up_and_fail:
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saved_errno = WSAECONNABORTED;
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tidy_up_and_fail:
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if (saved_errno < 0)
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saved_errno = WSAGetLastError();
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if (listener != -1)
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EVUTIL_CLOSESOCKET(listener);
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if (connector != -1)
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EVUTIL_CLOSESOCKET(connector);
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if (acceptor != -1)
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EVUTIL_CLOSESOCKET(acceptor);
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EVUTIL_SET_SOCKET_ERROR(saved_errno);
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return -1;
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#endif
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}
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int
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evutil_make_socket_nonblocking(int fd)
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{
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#ifdef WIN32
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{
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unsigned long nonblocking = 1;
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ioctlsocket(fd, FIONBIO, (unsigned long*) &nonblocking);
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}
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#else
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if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
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event_warn("fcntl(O_NONBLOCK)");
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return -1;
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}
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#endif
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return 0;
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}
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ev_int64_t
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evutil_strtoll(const char *s, char **endptr, int base)
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{
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#ifdef HAVE_STRTOLL
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return (ev_int64_t)strtoll(s, endptr, base);
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#elif SIZEOF_LONG == 8
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return (ev_int64_t)strtol(s, endptr, base);
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#elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300
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/* XXXX on old versions of MS APIs, we only support base
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* 10. */
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ev_int64_t r;
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if (base != 10)
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return 0;
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r = (ev_int64_t) _atoi64(s);
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while (isspace(*s))
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++s;
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while (isdigit(*s))
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++s;
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if (endptr)
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*endptr = (char*) s;
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return r;
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#elif defined(WIN32)
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return (ev_int64_t) _strtoi64(s, endptr, base);
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#else
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#error "I don't know how to parse 64-bit integers."
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#endif
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}
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#ifndef _EVENT_HAVE_GETTIMEOFDAY
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int
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evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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struct _timeb tb;
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if(tv == NULL)
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return -1;
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_ftime(&tb);
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tv->tv_sec = (long) tb.time;
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tv->tv_usec = ((int) tb.millitm) * 1000;
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return 0;
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}
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#endif
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int
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evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
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{
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int r;
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va_list ap;
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va_start(ap, format);
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r = evutil_vsnprintf(buf, buflen, format, ap);
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va_end(ap);
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return r;
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}
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int
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evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
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{
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#ifdef _MSC_VER
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int r = _vsnprintf(buf, buflen, format, ap);
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buf[buflen-1] = '\0';
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if (r >= 0)
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return r;
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else
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return _vscprintf(format, ap);
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#else
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int r = vsnprintf(buf, buflen, format, ap);
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buf[buflen-1] = '\0';
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return r;
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#endif
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}
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static int
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evutil_issetugid(void)
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{
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#ifdef _EVENT_HAVE_ISSETUGID
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return issetugid();
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#else
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#ifdef _EVENT_HAVE_GETEUID
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if (getuid() != geteuid())
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return 1;
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#endif
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#ifdef _EVENT_HAVE_GETEGID
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if (getgid() != getegid())
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return 1;
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#endif
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return 0;
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#endif
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}
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const char *
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evutil_getenv(const char *varname)
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{
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if (evutil_issetugid())
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return NULL;
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return getenv(varname);
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}
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