mirror of
https://github.com/freebsd/freebsd-src
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2766 lines
70 KiB
C
2766 lines
70 KiB
C
/*
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* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
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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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#include "event2/event-config.h"
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#include "evconfig-private.h"
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#ifdef _WIN32
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#include <winsock2.h>
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#include <winerror.h>
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#include <ws2tcpip.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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#include <io.h>
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#include <tchar.h>
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#include <process.h>
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#undef _WIN32_WINNT
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/* For structs needed by GetAdaptersAddresses */
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#define _WIN32_WINNT 0x0501
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#include <iphlpapi.h>
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#include <netioapi.h>
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#endif
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#include <sys/types.h>
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#ifdef EVENT__HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef EVENT__HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef EVENT__HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef EVENT__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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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef EVENT__HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef EVENT__HAVE_NETINET_IN6_H
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#include <netinet/in6.h>
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#endif
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#ifdef EVENT__HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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#ifdef EVENT__HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include <time.h>
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#include <sys/stat.h>
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#ifndef _WIN32
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#include <net/if.h>
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#endif
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#ifdef EVENT__HAVE_IFADDRS_H
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#include <ifaddrs.h>
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#endif
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#include "event2/util.h"
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#include "util-internal.h"
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#include "log-internal.h"
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#include "mm-internal.h"
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#include "evthread-internal.h"
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#include "strlcpy-internal.h"
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#include "ipv6-internal.h"
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#ifdef _WIN32
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#define HT_NO_CACHE_HASH_VALUES
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#include "ht-internal.h"
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#define open _open
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#define read _read
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#define close _close
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#ifndef fstat
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#define fstat _fstati64
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#endif
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#ifndef stat
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#define stat _stati64
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#endif
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#define mode_t int
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#endif
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int
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evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode)
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{
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int fd;
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#ifdef O_CLOEXEC
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fd = open(pathname, flags|O_CLOEXEC, (mode_t)mode);
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if (fd >= 0 || errno == EINVAL)
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return fd;
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/* If we got an EINVAL, fall through and try without O_CLOEXEC */
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#endif
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fd = open(pathname, flags, (mode_t)mode);
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if (fd < 0)
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return -1;
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#if defined(FD_CLOEXEC)
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
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close(fd);
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return -1;
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}
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#endif
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return fd;
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}
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/**
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Read the contents of 'filename' into a newly allocated NUL-terminated
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string. Set *content_out to hold this string, and *len_out to hold its
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length (not including the appended NUL). If 'is_binary', open the file in
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binary mode.
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Returns 0 on success, -1 if the open fails, and -2 for all other failures.
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Used internally only; may go away in a future version.
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*/
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int
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evutil_read_file_(const char *filename, char **content_out, size_t *len_out,
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int is_binary)
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{
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int fd, r;
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struct stat st;
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char *mem;
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size_t read_so_far=0;
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int mode = O_RDONLY;
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EVUTIL_ASSERT(content_out);
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EVUTIL_ASSERT(len_out);
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*content_out = NULL;
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*len_out = 0;
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#ifdef O_BINARY
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if (is_binary)
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mode |= O_BINARY;
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#endif
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fd = evutil_open_closeonexec_(filename, mode, 0);
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if (fd < 0)
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return -1;
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if (fstat(fd, &st) || st.st_size < 0 ||
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st.st_size > EV_SSIZE_MAX-1 ) {
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close(fd);
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return -2;
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}
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mem = mm_malloc((size_t)st.st_size + 1);
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if (!mem) {
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close(fd);
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return -2;
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}
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read_so_far = 0;
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#ifdef _WIN32
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#define N_TO_READ(x) ((x) > INT_MAX) ? INT_MAX : ((int)(x))
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#else
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#define N_TO_READ(x) (x)
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#endif
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while ((r = read(fd, mem+read_so_far, N_TO_READ(st.st_size - read_so_far))) > 0) {
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read_so_far += r;
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if (read_so_far >= (size_t)st.st_size)
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break;
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EVUTIL_ASSERT(read_so_far < (size_t)st.st_size);
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}
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close(fd);
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if (r < 0) {
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mm_free(mem);
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return -2;
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}
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mem[read_so_far] = 0;
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*len_out = read_so_far;
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*content_out = mem;
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return 0;
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}
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int
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evutil_socketpair(int family, int type, int protocol, evutil_socket_t 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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return evutil_ersatz_socketpair_(family, type, protocol, fd);
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#endif
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}
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int
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evutil_ersatz_socketpair_(int family, int type, int protocol,
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evutil_socket_t fd[2])
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{
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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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#ifdef _WIN32
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#define ERR(e) WSA##e
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#else
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#define ERR(e) e
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#endif
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evutil_socket_t listener = -1;
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evutil_socket_t connector = -1;
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evutil_socket_t acceptor = -1;
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struct sockaddr_in listen_addr;
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struct sockaddr_in connect_addr;
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ev_socklen_t size;
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int saved_errno = -1;
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int family_test;
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family_test = family != AF_INET;
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#ifdef AF_UNIX
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family_test = family_test && (family != AF_UNIX);
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#endif
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if (protocol || family_test) {
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EVUTIL_SET_SOCKET_ERROR(ERR(EAFNOSUPPORT));
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return -1;
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}
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if (!fd) {
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EVUTIL_SET_SOCKET_ERROR(ERR(EINVAL));
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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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memset(&connect_addr, 0, sizeof(connect_addr));
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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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/* 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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evutil_closesocket(listener);
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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 = ERR(ECONNABORTED);
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tidy_up_and_fail:
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if (saved_errno < 0)
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saved_errno = EVUTIL_SOCKET_ERROR();
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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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#undef ERR
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}
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int
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evutil_make_socket_nonblocking(evutil_socket_t 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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if (ioctlsocket(fd, FIONBIO, &nonblocking) == SOCKET_ERROR) {
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event_sock_warn(fd, "fcntl(%d, F_GETFL)", (int)fd);
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return -1;
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}
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}
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#else
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{
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int flags;
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if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) {
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event_warn("fcntl(%d, F_GETFL)", fd);
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return -1;
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}
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if (!(flags & O_NONBLOCK)) {
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if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
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event_warn("fcntl(%d, F_SETFL)", fd);
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return -1;
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}
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}
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}
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#endif
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return 0;
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}
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|
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/* Faster version of evutil_make_socket_nonblocking for internal use.
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*
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* Requires that no F_SETFL flags were previously set on the fd.
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*/
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static int
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evutil_fast_socket_nonblocking(evutil_socket_t fd)
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{
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#ifdef _WIN32
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return evutil_make_socket_nonblocking(fd);
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#else
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if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
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event_warn("fcntl(%d, F_SETFL)", fd);
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return -1;
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}
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return 0;
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#endif
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}
|
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int
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evutil_make_listen_socket_reuseable(evutil_socket_t sock)
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{
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#if defined(SO_REUSEADDR) && !defined(_WIN32)
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int one = 1;
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/* REUSEADDR on Unix means, "don't hang on to this address after the
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* listener is closed." On Windows, though, it means "don't keep other
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* processes from binding to this address while we're using it. */
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return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
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(ev_socklen_t)sizeof(one));
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#else
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return 0;
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#endif
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}
|
|
|
|
int
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evutil_make_listen_socket_reuseable_port(evutil_socket_t sock)
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{
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#if defined __linux__ && defined(SO_REUSEPORT)
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int one = 1;
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/* REUSEPORT on Linux 3.9+ means, "Multiple servers (processes or
|
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* threads) can bind to the same port if they each set the option. */
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return setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, (void*) &one,
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(ev_socklen_t)sizeof(one));
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#else
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return 0;
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#endif
|
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}
|
|
|
|
int
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evutil_make_listen_socket_ipv6only(evutil_socket_t sock)
|
|
{
|
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#if defined(IPV6_V6ONLY)
|
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int one = 1;
|
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return setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*) &one,
|
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(ev_socklen_t)sizeof(one));
|
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#endif
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return 0;
|
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}
|
|
|
|
int
|
|
evutil_make_tcp_listen_socket_deferred(evutil_socket_t sock)
|
|
{
|
|
#if defined(EVENT__HAVE_NETINET_TCP_H) && defined(TCP_DEFER_ACCEPT)
|
|
int one = 1;
|
|
|
|
/* TCP_DEFER_ACCEPT tells the kernel to call defer accept() only after data
|
|
* has arrived and ready to read */
|
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return setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &one,
|
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(ev_socklen_t)sizeof(one));
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evutil_make_socket_closeonexec(evutil_socket_t fd)
|
|
{
|
|
#if !defined(_WIN32) && defined(EVENT__HAVE_SETFD)
|
|
int flags;
|
|
if ((flags = fcntl(fd, F_GETFD, NULL)) < 0) {
|
|
event_warn("fcntl(%d, F_GETFD)", fd);
|
|
return -1;
|
|
}
|
|
if (!(flags & FD_CLOEXEC)) {
|
|
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
|
|
event_warn("fcntl(%d, F_SETFD)", fd);
|
|
return -1;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* Faster version of evutil_make_socket_closeonexec for internal use.
|
|
*
|
|
* Requires that no F_SETFD flags were previously set on the fd.
|
|
*/
|
|
static int
|
|
evutil_fast_socket_closeonexec(evutil_socket_t fd)
|
|
{
|
|
#if !defined(_WIN32) && defined(EVENT__HAVE_SETFD)
|
|
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
|
|
event_warn("fcntl(%d, F_SETFD)", fd);
|
|
return -1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evutil_closesocket(evutil_socket_t sock)
|
|
{
|
|
#ifndef _WIN32
|
|
return close(sock);
|
|
#else
|
|
return closesocket(sock);
|
|
#endif
|
|
}
|
|
|
|
ev_int64_t
|
|
evutil_strtoll(const char *s, char **endptr, int base)
|
|
{
|
|
#ifdef EVENT__HAVE_STRTOLL
|
|
return (ev_int64_t)strtoll(s, endptr, base);
|
|
#elif EVENT__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;
|
|
if (*s == '-')
|
|
++s;
|
|
while (isdigit(*s))
|
|
++s;
|
|
if (endptr)
|
|
*endptr = (char*) s;
|
|
return r;
|
|
#elif defined(_WIN32)
|
|
return (ev_int64_t) _strtoi64(s, endptr, base);
|
|
#elif defined(EVENT__SIZEOF_LONG_LONG) && EVENT__SIZEOF_LONG_LONG == 8
|
|
long long r;
|
|
int n;
|
|
if (base != 10 && base != 16)
|
|
return 0;
|
|
if (base == 10) {
|
|
n = sscanf(s, "%lld", &r);
|
|
} else {
|
|
unsigned long long ru=0;
|
|
n = sscanf(s, "%llx", &ru);
|
|
if (ru > EV_INT64_MAX)
|
|
return 0;
|
|
r = (long long) ru;
|
|
}
|
|
if (n != 1)
|
|
return 0;
|
|
while (EVUTIL_ISSPACE_(*s))
|
|
++s;
|
|
if (*s == '-')
|
|
++s;
|
|
if (base == 10) {
|
|
while (EVUTIL_ISDIGIT_(*s))
|
|
++s;
|
|
} else {
|
|
while (EVUTIL_ISXDIGIT_(*s))
|
|
++s;
|
|
}
|
|
if (endptr)
|
|
*endptr = (char*) s;
|
|
return r;
|
|
#else
|
|
#error "I don't know how to parse 64-bit integers."
|
|
#endif
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
int
|
|
evutil_socket_geterror(evutil_socket_t sock)
|
|
{
|
|
int optval, optvallen=sizeof(optval);
|
|
int err = WSAGetLastError();
|
|
if (err == WSAEWOULDBLOCK && sock >= 0) {
|
|
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&optval,
|
|
&optvallen))
|
|
return err;
|
|
if (optval)
|
|
return optval;
|
|
}
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
/* XXX we should use an enum here. */
|
|
/* 2 for connection refused, 1 for connected, 0 for not yet, -1 for error. */
|
|
int
|
|
evutil_socket_connect_(evutil_socket_t *fd_ptr, const struct sockaddr *sa, int socklen)
|
|
{
|
|
int made_fd = 0;
|
|
|
|
if (*fd_ptr < 0) {
|
|
if ((*fd_ptr = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
|
|
goto err;
|
|
made_fd = 1;
|
|
if (evutil_make_socket_nonblocking(*fd_ptr) < 0) {
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (connect(*fd_ptr, sa, socklen) < 0) {
|
|
int e = evutil_socket_geterror(*fd_ptr);
|
|
if (EVUTIL_ERR_CONNECT_RETRIABLE(e))
|
|
return 0;
|
|
if (EVUTIL_ERR_CONNECT_REFUSED(e))
|
|
return 2;
|
|
goto err;
|
|
} else {
|
|
return 1;
|
|
}
|
|
|
|
err:
|
|
if (made_fd) {
|
|
evutil_closesocket(*fd_ptr);
|
|
*fd_ptr = -1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Check whether a socket on which we called connect() is done
|
|
connecting. Return 1 for connected, 0 for not yet, -1 for error. In the
|
|
error case, set the current socket errno to the error that happened during
|
|
the connect operation. */
|
|
int
|
|
evutil_socket_finished_connecting_(evutil_socket_t fd)
|
|
{
|
|
int e;
|
|
ev_socklen_t elen = sizeof(e);
|
|
|
|
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&e, &elen) < 0)
|
|
return -1;
|
|
|
|
if (e) {
|
|
if (EVUTIL_ERR_CONNECT_RETRIABLE(e))
|
|
return 0;
|
|
EVUTIL_SET_SOCKET_ERROR(e);
|
|
return -1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#if (EVUTIL_AI_PASSIVE|EVUTIL_AI_CANONNAME|EVUTIL_AI_NUMERICHOST| \
|
|
EVUTIL_AI_NUMERICSERV|EVUTIL_AI_V4MAPPED|EVUTIL_AI_ALL| \
|
|
EVUTIL_AI_ADDRCONFIG) != \
|
|
(EVUTIL_AI_PASSIVE^EVUTIL_AI_CANONNAME^EVUTIL_AI_NUMERICHOST^ \
|
|
EVUTIL_AI_NUMERICSERV^EVUTIL_AI_V4MAPPED^EVUTIL_AI_ALL^ \
|
|
EVUTIL_AI_ADDRCONFIG)
|
|
#error "Some of our EVUTIL_AI_* flags seem to overlap with system AI_* flags"
|
|
#endif
|
|
|
|
/* We sometimes need to know whether we have an ipv4 address and whether we
|
|
have an ipv6 address. If 'have_checked_interfaces', then we've already done
|
|
the test. If 'had_ipv4_address', then it turns out we had an ipv4 address.
|
|
If 'had_ipv6_address', then it turns out we had an ipv6 address. These are
|
|
set by evutil_check_interfaces. */
|
|
static int have_checked_interfaces, had_ipv4_address, had_ipv6_address;
|
|
|
|
/* True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8 */
|
|
static inline int evutil_v4addr_is_localhost(ev_uint32_t addr)
|
|
{ return addr>>24 == 127; }
|
|
|
|
/* True iff the IPv4 address 'addr', in host order, is link-local
|
|
* 169.254.0.0/16 (RFC3927) */
|
|
static inline int evutil_v4addr_is_linklocal(ev_uint32_t addr)
|
|
{ return ((addr & 0xffff0000U) == 0xa9fe0000U); }
|
|
|
|
/* True iff the IPv4 address 'addr', in host order, is a class D
|
|
* (multiclass) address. */
|
|
static inline int evutil_v4addr_is_classd(ev_uint32_t addr)
|
|
{ return ((addr>>24) & 0xf0) == 0xe0; }
|
|
|
|
int
|
|
evutil_v4addr_is_local_(const struct in_addr *in)
|
|
{
|
|
const ev_uint32_t addr = ntohl(in->s_addr);
|
|
return addr == INADDR_ANY ||
|
|
evutil_v4addr_is_localhost(addr) ||
|
|
evutil_v4addr_is_linklocal(addr) ||
|
|
evutil_v4addr_is_classd(addr);
|
|
}
|
|
int
|
|
evutil_v6addr_is_local_(const struct in6_addr *in)
|
|
{
|
|
static const char ZEROES[] =
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00"
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00";
|
|
|
|
const unsigned char *addr = (const unsigned char *)in->s6_addr;
|
|
return !memcmp(addr, ZEROES, 8) ||
|
|
((addr[0] & 0xfe) == 0xfc) ||
|
|
(addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80) ||
|
|
(addr[0] == 0xfe && (addr[1] & 0xc0) == 0xc0) ||
|
|
(addr[0] == 0xff);
|
|
}
|
|
|
|
static void
|
|
evutil_found_ifaddr(const struct sockaddr *sa)
|
|
{
|
|
if (sa->sa_family == AF_INET) {
|
|
const struct sockaddr_in *sin = (struct sockaddr_in *)sa;
|
|
if (!evutil_v4addr_is_local_(&sin->sin_addr)) {
|
|
event_debug(("Detected an IPv4 interface"));
|
|
had_ipv4_address = 1;
|
|
}
|
|
} else if (sa->sa_family == AF_INET6) {
|
|
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
|
|
if (!evutil_v6addr_is_local_(&sin6->sin6_addr)) {
|
|
event_debug(("Detected an IPv6 interface"));
|
|
had_ipv6_address = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
typedef ULONG (WINAPI *GetAdaptersAddresses_fn_t)(
|
|
ULONG, ULONG, PVOID, PIP_ADAPTER_ADDRESSES, PULONG);
|
|
#endif
|
|
|
|
static int
|
|
evutil_check_ifaddrs(void)
|
|
{
|
|
#if defined(EVENT__HAVE_GETIFADDRS)
|
|
/* Most free Unixy systems provide getifaddrs, which gives us a linked list
|
|
* of struct ifaddrs. */
|
|
struct ifaddrs *ifa = NULL;
|
|
const struct ifaddrs *i;
|
|
if (getifaddrs(&ifa) < 0) {
|
|
event_warn("Unable to call getifaddrs()");
|
|
return -1;
|
|
}
|
|
|
|
for (i = ifa; i; i = i->ifa_next) {
|
|
if (!i->ifa_addr)
|
|
continue;
|
|
evutil_found_ifaddr(i->ifa_addr);
|
|
}
|
|
|
|
freeifaddrs(ifa);
|
|
return 0;
|
|
#elif defined(_WIN32)
|
|
/* Windows XP began to provide GetAdaptersAddresses. Windows 2000 had a
|
|
"GetAdaptersInfo", but that's deprecated; let's just try
|
|
GetAdaptersAddresses and fall back to connect+getsockname.
|
|
*/
|
|
HMODULE lib = evutil_load_windows_system_library_(TEXT("iphlpapi.dll"));
|
|
GetAdaptersAddresses_fn_t fn;
|
|
ULONG size, res;
|
|
IP_ADAPTER_ADDRESSES *addresses = NULL, *address;
|
|
int result = -1;
|
|
|
|
#define FLAGS (GAA_FLAG_SKIP_ANYCAST | \
|
|
GAA_FLAG_SKIP_MULTICAST | \
|
|
GAA_FLAG_SKIP_DNS_SERVER)
|
|
|
|
if (!lib)
|
|
goto done;
|
|
|
|
if (!(fn = (GetAdaptersAddresses_fn_t) GetProcAddress(lib, "GetAdaptersAddresses")))
|
|
goto done;
|
|
|
|
/* Guess how much space we need. */
|
|
size = 15*1024;
|
|
addresses = mm_malloc(size);
|
|
if (!addresses)
|
|
goto done;
|
|
res = fn(AF_UNSPEC, FLAGS, NULL, addresses, &size);
|
|
if (res == ERROR_BUFFER_OVERFLOW) {
|
|
/* we didn't guess that we needed enough space; try again */
|
|
mm_free(addresses);
|
|
addresses = mm_malloc(size);
|
|
if (!addresses)
|
|
goto done;
|
|
res = fn(AF_UNSPEC, FLAGS, NULL, addresses, &size);
|
|
}
|
|
if (res != NO_ERROR)
|
|
goto done;
|
|
|
|
for (address = addresses; address; address = address->Next) {
|
|
IP_ADAPTER_UNICAST_ADDRESS *a;
|
|
for (a = address->FirstUnicastAddress; a; a = a->Next) {
|
|
/* Yes, it's a linked list inside a linked list */
|
|
struct sockaddr *sa = a->Address.lpSockaddr;
|
|
evutil_found_ifaddr(sa);
|
|
}
|
|
}
|
|
|
|
result = 0;
|
|
done:
|
|
if (lib)
|
|
FreeLibrary(lib);
|
|
if (addresses)
|
|
mm_free(addresses);
|
|
return result;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
/* Test whether we have an ipv4 interface and an ipv6 interface. Return 0 if
|
|
* the test seemed successful. */
|
|
static int
|
|
evutil_check_interfaces(void)
|
|
{
|
|
evutil_socket_t fd = -1;
|
|
struct sockaddr_in sin, sin_out;
|
|
struct sockaddr_in6 sin6, sin6_out;
|
|
ev_socklen_t sin_out_len = sizeof(sin_out);
|
|
ev_socklen_t sin6_out_len = sizeof(sin6_out);
|
|
int r;
|
|
if (have_checked_interfaces)
|
|
return 0;
|
|
|
|
/* From this point on we have done the ipv4/ipv6 interface check */
|
|
have_checked_interfaces = 1;
|
|
|
|
if (evutil_check_ifaddrs() == 0) {
|
|
/* Use a nice sane interface, if this system has one. */
|
|
return 0;
|
|
}
|
|
|
|
/* Ugh. There was no nice sane interface. So to check whether we have
|
|
* an interface open for a given protocol, will try to make a UDP
|
|
* 'connection' to a remote host on the internet. We don't actually
|
|
* use it, so the address doesn't matter, but we want to pick one that
|
|
* keep us from using a host- or link-local interface. */
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(53);
|
|
r = evutil_inet_pton(AF_INET, "18.244.0.188", &sin.sin_addr);
|
|
EVUTIL_ASSERT(r);
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_port = htons(53);
|
|
r = evutil_inet_pton(AF_INET6, "2001:4860:b002::68", &sin6.sin6_addr);
|
|
EVUTIL_ASSERT(r);
|
|
|
|
memset(&sin_out, 0, sizeof(sin_out));
|
|
memset(&sin6_out, 0, sizeof(sin6_out));
|
|
|
|
/* XXX some errnos mean 'no address'; some mean 'not enough sockets'. */
|
|
if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) >= 0 &&
|
|
connect(fd, (struct sockaddr*)&sin, sizeof(sin)) == 0 &&
|
|
getsockname(fd, (struct sockaddr*)&sin_out, &sin_out_len) == 0) {
|
|
/* We might have an IPv4 interface. */
|
|
evutil_found_ifaddr((struct sockaddr*) &sin_out);
|
|
}
|
|
if (fd >= 0)
|
|
evutil_closesocket(fd);
|
|
|
|
if ((fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) >= 0 &&
|
|
connect(fd, (struct sockaddr*)&sin6, sizeof(sin6)) == 0 &&
|
|
getsockname(fd, (struct sockaddr*)&sin6_out, &sin6_out_len) == 0) {
|
|
/* We might have an IPv6 interface. */
|
|
evutil_found_ifaddr((struct sockaddr*) &sin6_out);
|
|
}
|
|
|
|
if (fd >= 0)
|
|
evutil_closesocket(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Internal addrinfo flag. This one is set when we allocate the addrinfo from
|
|
* inside libevent. Otherwise, the built-in getaddrinfo() function allocated
|
|
* it, and we should trust what they said.
|
|
**/
|
|
#define EVUTIL_AI_LIBEVENT_ALLOCATED 0x80000000
|
|
|
|
/* Helper: construct a new addrinfo containing the socket address in
|
|
* 'sa', which must be a sockaddr_in or a sockaddr_in6. Take the
|
|
* socktype and protocol info from hints. If they weren't set, then
|
|
* allocate both a TCP and a UDP addrinfo.
|
|
*/
|
|
struct evutil_addrinfo *
|
|
evutil_new_addrinfo_(struct sockaddr *sa, ev_socklen_t socklen,
|
|
const struct evutil_addrinfo *hints)
|
|
{
|
|
struct evutil_addrinfo *res;
|
|
EVUTIL_ASSERT(hints);
|
|
|
|
if (hints->ai_socktype == 0 && hints->ai_protocol == 0) {
|
|
/* Indecisive user! Give them a UDP and a TCP. */
|
|
struct evutil_addrinfo *r1, *r2;
|
|
struct evutil_addrinfo tmp;
|
|
memcpy(&tmp, hints, sizeof(tmp));
|
|
tmp.ai_socktype = SOCK_STREAM; tmp.ai_protocol = IPPROTO_TCP;
|
|
r1 = evutil_new_addrinfo_(sa, socklen, &tmp);
|
|
if (!r1)
|
|
return NULL;
|
|
tmp.ai_socktype = SOCK_DGRAM; tmp.ai_protocol = IPPROTO_UDP;
|
|
r2 = evutil_new_addrinfo_(sa, socklen, &tmp);
|
|
if (!r2) {
|
|
evutil_freeaddrinfo(r1);
|
|
return NULL;
|
|
}
|
|
r1->ai_next = r2;
|
|
return r1;
|
|
}
|
|
|
|
/* We're going to allocate extra space to hold the sockaddr. */
|
|
res = mm_calloc(1,sizeof(struct evutil_addrinfo)+socklen);
|
|
if (!res)
|
|
return NULL;
|
|
res->ai_addr = (struct sockaddr*)
|
|
(((char*)res) + sizeof(struct evutil_addrinfo));
|
|
memcpy(res->ai_addr, sa, socklen);
|
|
res->ai_addrlen = socklen;
|
|
res->ai_family = sa->sa_family; /* Same or not? XXX */
|
|
res->ai_flags = EVUTIL_AI_LIBEVENT_ALLOCATED;
|
|
res->ai_socktype = hints->ai_socktype;
|
|
res->ai_protocol = hints->ai_protocol;
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Append the addrinfo 'append' to the end of 'first', and return the start of
|
|
* the list. Either element can be NULL, in which case we return the element
|
|
* that is not NULL. */
|
|
struct evutil_addrinfo *
|
|
evutil_addrinfo_append_(struct evutil_addrinfo *first,
|
|
struct evutil_addrinfo *append)
|
|
{
|
|
struct evutil_addrinfo *ai = first;
|
|
if (!ai)
|
|
return append;
|
|
while (ai->ai_next)
|
|
ai = ai->ai_next;
|
|
ai->ai_next = append;
|
|
|
|
return first;
|
|
}
|
|
|
|
static int
|
|
parse_numeric_servname(const char *servname)
|
|
{
|
|
int n;
|
|
char *endptr=NULL;
|
|
n = (int) strtol(servname, &endptr, 10);
|
|
if (n>=0 && n <= 65535 && servname[0] && endptr && !endptr[0])
|
|
return n;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
/** Parse a service name in 'servname', which can be a decimal port.
|
|
* Return the port number, or -1 on error.
|
|
*/
|
|
static int
|
|
evutil_parse_servname(const char *servname, const char *protocol,
|
|
const struct evutil_addrinfo *hints)
|
|
{
|
|
int n = parse_numeric_servname(servname);
|
|
if (n>=0)
|
|
return n;
|
|
#if defined(EVENT__HAVE_GETSERVBYNAME) || defined(_WIN32)
|
|
if (!(hints->ai_flags & EVUTIL_AI_NUMERICSERV)) {
|
|
struct servent *ent = getservbyname(servname, protocol);
|
|
if (ent) {
|
|
return ntohs(ent->s_port);
|
|
}
|
|
}
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
/* Return a string corresponding to a protocol number that we can pass to
|
|
* getservyname. */
|
|
static const char *
|
|
evutil_unparse_protoname(int proto)
|
|
{
|
|
switch (proto) {
|
|
case 0:
|
|
return NULL;
|
|
case IPPROTO_TCP:
|
|
return "tcp";
|
|
case IPPROTO_UDP:
|
|
return "udp";
|
|
#ifdef IPPROTO_SCTP
|
|
case IPPROTO_SCTP:
|
|
return "sctp";
|
|
#endif
|
|
default:
|
|
#ifdef EVENT__HAVE_GETPROTOBYNUMBER
|
|
{
|
|
struct protoent *ent = getprotobynumber(proto);
|
|
if (ent)
|
|
return ent->p_name;
|
|
}
|
|
#endif
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
evutil_getaddrinfo_infer_protocols(struct evutil_addrinfo *hints)
|
|
{
|
|
/* If we can guess the protocol from the socktype, do so. */
|
|
if (!hints->ai_protocol && hints->ai_socktype) {
|
|
if (hints->ai_socktype == SOCK_DGRAM)
|
|
hints->ai_protocol = IPPROTO_UDP;
|
|
else if (hints->ai_socktype == SOCK_STREAM)
|
|
hints->ai_protocol = IPPROTO_TCP;
|
|
}
|
|
|
|
/* Set the socktype if it isn't set. */
|
|
if (!hints->ai_socktype && hints->ai_protocol) {
|
|
if (hints->ai_protocol == IPPROTO_UDP)
|
|
hints->ai_socktype = SOCK_DGRAM;
|
|
else if (hints->ai_protocol == IPPROTO_TCP)
|
|
hints->ai_socktype = SOCK_STREAM;
|
|
#ifdef IPPROTO_SCTP
|
|
else if (hints->ai_protocol == IPPROTO_SCTP)
|
|
hints->ai_socktype = SOCK_STREAM;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#if AF_UNSPEC != PF_UNSPEC
|
|
#error "I cannot build on a system where AF_UNSPEC != PF_UNSPEC"
|
|
#endif
|
|
|
|
/** Implements the part of looking up hosts by name that's common to both
|
|
* the blocking and nonblocking resolver:
|
|
* - Adjust 'hints' to have a reasonable socktype and protocol.
|
|
* - Look up the port based on 'servname', and store it in *portnum,
|
|
* - Handle the nodename==NULL case
|
|
* - Handle some invalid arguments cases.
|
|
* - Handle the cases where nodename is an IPv4 or IPv6 address.
|
|
*
|
|
* If we need the resolver to look up the hostname, we return
|
|
* EVUTIL_EAI_NEED_RESOLVE. Otherwise, we can completely implement
|
|
* getaddrinfo: we return 0 or an appropriate EVUTIL_EAI_* error, and
|
|
* set *res as getaddrinfo would.
|
|
*/
|
|
int
|
|
evutil_getaddrinfo_common_(const char *nodename, const char *servname,
|
|
struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum)
|
|
{
|
|
int port = 0;
|
|
unsigned int if_index;
|
|
const char *pname;
|
|
|
|
if (nodename == NULL && servname == NULL)
|
|
return EVUTIL_EAI_NONAME;
|
|
|
|
/* We only understand 3 families */
|
|
if (hints->ai_family != PF_UNSPEC && hints->ai_family != PF_INET &&
|
|
hints->ai_family != PF_INET6)
|
|
return EVUTIL_EAI_FAMILY;
|
|
|
|
evutil_getaddrinfo_infer_protocols(hints);
|
|
|
|
/* Look up the port number and protocol, if possible. */
|
|
pname = evutil_unparse_protoname(hints->ai_protocol);
|
|
if (servname) {
|
|
/* XXXX We could look at the protocol we got back from
|
|
* getservbyname, but it doesn't seem too useful. */
|
|
port = evutil_parse_servname(servname, pname, hints);
|
|
if (port < 0) {
|
|
return EVUTIL_EAI_NONAME;
|
|
}
|
|
}
|
|
|
|
/* If we have no node name, then we're supposed to bind to 'any' and
|
|
* connect to localhost. */
|
|
if (nodename == NULL) {
|
|
struct evutil_addrinfo *res4=NULL, *res6=NULL;
|
|
if (hints->ai_family != PF_INET) { /* INET6 or UNSPEC. */
|
|
struct sockaddr_in6 sin6;
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_port = htons(port);
|
|
if (hints->ai_flags & EVUTIL_AI_PASSIVE) {
|
|
/* Bind to :: */
|
|
} else {
|
|
/* connect to ::1 */
|
|
sin6.sin6_addr.s6_addr[15] = 1;
|
|
}
|
|
res6 = evutil_new_addrinfo_((struct sockaddr*)&sin6,
|
|
sizeof(sin6), hints);
|
|
if (!res6)
|
|
return EVUTIL_EAI_MEMORY;
|
|
}
|
|
|
|
if (hints->ai_family != PF_INET6) { /* INET or UNSPEC */
|
|
struct sockaddr_in sin;
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(port);
|
|
if (hints->ai_flags & EVUTIL_AI_PASSIVE) {
|
|
/* Bind to 0.0.0.0 */
|
|
} else {
|
|
/* connect to 127.0.0.1 */
|
|
sin.sin_addr.s_addr = htonl(0x7f000001);
|
|
}
|
|
res4 = evutil_new_addrinfo_((struct sockaddr*)&sin,
|
|
sizeof(sin), hints);
|
|
if (!res4) {
|
|
if (res6)
|
|
evutil_freeaddrinfo(res6);
|
|
return EVUTIL_EAI_MEMORY;
|
|
}
|
|
}
|
|
*res = evutil_addrinfo_append_(res4, res6);
|
|
return 0;
|
|
}
|
|
|
|
/* If we can, we should try to parse the hostname without resolving
|
|
* it. */
|
|
/* Try ipv6. */
|
|
if (hints->ai_family == PF_INET6 || hints->ai_family == PF_UNSPEC) {
|
|
struct sockaddr_in6 sin6;
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
if (1 == evutil_inet_pton_scope(
|
|
AF_INET6, nodename, &sin6.sin6_addr, &if_index)) {
|
|
/* Got an ipv6 address. */
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_port = htons(port);
|
|
sin6.sin6_scope_id = if_index;
|
|
*res = evutil_new_addrinfo_((struct sockaddr*)&sin6,
|
|
sizeof(sin6), hints);
|
|
if (!*res)
|
|
return EVUTIL_EAI_MEMORY;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Try ipv4. */
|
|
if (hints->ai_family == PF_INET || hints->ai_family == PF_UNSPEC) {
|
|
struct sockaddr_in sin;
|
|
memset(&sin, 0, sizeof(sin));
|
|
if (1==evutil_inet_pton(AF_INET, nodename, &sin.sin_addr)) {
|
|
/* Got an ipv4 address. */
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(port);
|
|
*res = evutil_new_addrinfo_((struct sockaddr*)&sin,
|
|
sizeof(sin), hints);
|
|
if (!*res)
|
|
return EVUTIL_EAI_MEMORY;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* If we have reached this point, we definitely need to do a DNS
|
|
* lookup. */
|
|
if ((hints->ai_flags & EVUTIL_AI_NUMERICHOST)) {
|
|
/* If we're not allowed to do one, then say so. */
|
|
return EVUTIL_EAI_NONAME;
|
|
}
|
|
*portnum = port;
|
|
return EVUTIL_EAI_NEED_RESOLVE;
|
|
}
|
|
|
|
#ifdef EVENT__HAVE_GETADDRINFO
|
|
#define USE_NATIVE_GETADDRINFO
|
|
#endif
|
|
|
|
#ifdef USE_NATIVE_GETADDRINFO
|
|
/* A mask of all the flags that we declare, so we can clear them before calling
|
|
* the native getaddrinfo */
|
|
static const unsigned int ALL_NONNATIVE_AI_FLAGS =
|
|
#ifndef AI_PASSIVE
|
|
EVUTIL_AI_PASSIVE |
|
|
#endif
|
|
#ifndef AI_CANONNAME
|
|
EVUTIL_AI_CANONNAME |
|
|
#endif
|
|
#ifndef AI_NUMERICHOST
|
|
EVUTIL_AI_NUMERICHOST |
|
|
#endif
|
|
#ifndef AI_NUMERICSERV
|
|
EVUTIL_AI_NUMERICSERV |
|
|
#endif
|
|
#ifndef AI_ADDRCONFIG
|
|
EVUTIL_AI_ADDRCONFIG |
|
|
#endif
|
|
#ifndef AI_ALL
|
|
EVUTIL_AI_ALL |
|
|
#endif
|
|
#ifndef AI_V4MAPPED
|
|
EVUTIL_AI_V4MAPPED |
|
|
#endif
|
|
EVUTIL_AI_LIBEVENT_ALLOCATED;
|
|
|
|
static const unsigned int ALL_NATIVE_AI_FLAGS =
|
|
#ifdef AI_PASSIVE
|
|
AI_PASSIVE |
|
|
#endif
|
|
#ifdef AI_CANONNAME
|
|
AI_CANONNAME |
|
|
#endif
|
|
#ifdef AI_NUMERICHOST
|
|
AI_NUMERICHOST |
|
|
#endif
|
|
#ifdef AI_NUMERICSERV
|
|
AI_NUMERICSERV |
|
|
#endif
|
|
#ifdef AI_ADDRCONFIG
|
|
AI_ADDRCONFIG |
|
|
#endif
|
|
#ifdef AI_ALL
|
|
AI_ALL |
|
|
#endif
|
|
#ifdef AI_V4MAPPED
|
|
AI_V4MAPPED |
|
|
#endif
|
|
0;
|
|
#endif
|
|
|
|
#ifndef USE_NATIVE_GETADDRINFO
|
|
/* Helper for systems with no getaddrinfo(): make one or more addrinfos out of
|
|
* a struct hostent.
|
|
*/
|
|
static struct evutil_addrinfo *
|
|
addrinfo_from_hostent(const struct hostent *ent,
|
|
int port, const struct evutil_addrinfo *hints)
|
|
{
|
|
int i;
|
|
struct sockaddr_in sin;
|
|
struct sockaddr_in6 sin6;
|
|
struct sockaddr *sa;
|
|
int socklen;
|
|
struct evutil_addrinfo *res=NULL, *ai;
|
|
void *addrp;
|
|
|
|
if (ent->h_addrtype == PF_INET) {
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(port);
|
|
sa = (struct sockaddr *)&sin;
|
|
socklen = sizeof(struct sockaddr_in);
|
|
addrp = &sin.sin_addr;
|
|
if (ent->h_length != sizeof(sin.sin_addr)) {
|
|
event_warnx("Weird h_length from gethostbyname");
|
|
return NULL;
|
|
}
|
|
} else if (ent->h_addrtype == PF_INET6) {
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_port = htons(port);
|
|
sa = (struct sockaddr *)&sin6;
|
|
socklen = sizeof(struct sockaddr_in6);
|
|
addrp = &sin6.sin6_addr;
|
|
if (ent->h_length != sizeof(sin6.sin6_addr)) {
|
|
event_warnx("Weird h_length from gethostbyname");
|
|
return NULL;
|
|
}
|
|
} else
|
|
return NULL;
|
|
|
|
for (i = 0; ent->h_addr_list[i]; ++i) {
|
|
memcpy(addrp, ent->h_addr_list[i], ent->h_length);
|
|
ai = evutil_new_addrinfo_(sa, socklen, hints);
|
|
if (!ai) {
|
|
evutil_freeaddrinfo(res);
|
|
return NULL;
|
|
}
|
|
res = evutil_addrinfo_append_(res, ai);
|
|
}
|
|
|
|
if (res && ((hints->ai_flags & EVUTIL_AI_CANONNAME) && ent->h_name)) {
|
|
res->ai_canonname = mm_strdup(ent->h_name);
|
|
if (res->ai_canonname == NULL) {
|
|
evutil_freeaddrinfo(res);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
/* If the EVUTIL_AI_ADDRCONFIG flag is set on hints->ai_flags, and
|
|
* hints->ai_family is PF_UNSPEC, then revise the value of hints->ai_family so
|
|
* that we'll only get addresses we could maybe connect to.
|
|
*/
|
|
void
|
|
evutil_adjust_hints_for_addrconfig_(struct evutil_addrinfo *hints)
|
|
{
|
|
if (!(hints->ai_flags & EVUTIL_AI_ADDRCONFIG))
|
|
return;
|
|
if (hints->ai_family != PF_UNSPEC)
|
|
return;
|
|
evutil_check_interfaces();
|
|
if (had_ipv4_address && !had_ipv6_address) {
|
|
hints->ai_family = PF_INET;
|
|
} else if (!had_ipv4_address && had_ipv6_address) {
|
|
hints->ai_family = PF_INET6;
|
|
}
|
|
}
|
|
|
|
#ifdef USE_NATIVE_GETADDRINFO
|
|
static int need_numeric_port_hack_=0;
|
|
static int need_socktype_protocol_hack_=0;
|
|
static int tested_for_getaddrinfo_hacks=0;
|
|
|
|
/* Some older BSDs (like OpenBSD up to 4.6) used to believe that
|
|
giving a numeric port without giving an ai_socktype was verboten.
|
|
We test for this so we can apply an appropriate workaround. If it
|
|
turns out that the bug is present, then:
|
|
|
|
- If nodename==NULL and servname is numeric, we build an answer
|
|
ourselves using evutil_getaddrinfo_common_().
|
|
|
|
- If nodename!=NULL and servname is numeric, then we set
|
|
servname=NULL when calling getaddrinfo, and post-process the
|
|
result to set the ports on it.
|
|
|
|
We test for this bug at runtime, since otherwise we can't have the
|
|
same binary run on multiple BSD versions.
|
|
|
|
- Some versions of Solaris believe that it's nice to leave to protocol
|
|
field set to 0. We test for this so we can apply an appropriate
|
|
workaround.
|
|
*/
|
|
static struct evutil_addrinfo *ai_find_protocol(struct evutil_addrinfo *ai)
|
|
{
|
|
while (ai) {
|
|
if (ai->ai_protocol)
|
|
return ai;
|
|
ai = ai->ai_next;
|
|
}
|
|
return NULL;
|
|
}
|
|
static void
|
|
test_for_getaddrinfo_hacks(void)
|
|
{
|
|
int r, r2;
|
|
struct evutil_addrinfo *ai=NULL, *ai2=NULL, *ai3=NULL;
|
|
struct evutil_addrinfo hints;
|
|
|
|
memset(&hints,0,sizeof(hints));
|
|
hints.ai_family = PF_UNSPEC;
|
|
hints.ai_flags =
|
|
#ifdef AI_NUMERICHOST
|
|
AI_NUMERICHOST |
|
|
#endif
|
|
#ifdef AI_NUMERICSERV
|
|
AI_NUMERICSERV |
|
|
#endif
|
|
0;
|
|
r = getaddrinfo("1.2.3.4", "80", &hints, &ai);
|
|
getaddrinfo("1.2.3.4", NULL, &hints, &ai3);
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
r2 = getaddrinfo("1.2.3.4", "80", &hints, &ai2);
|
|
if (r2 == 0 && r != 0) {
|
|
need_numeric_port_hack_=1;
|
|
}
|
|
if (!ai_find_protocol(ai2) || !ai_find_protocol(ai3)) {
|
|
need_socktype_protocol_hack_=1;
|
|
}
|
|
|
|
if (ai)
|
|
freeaddrinfo(ai);
|
|
if (ai2)
|
|
freeaddrinfo(ai2);
|
|
if (ai3)
|
|
freeaddrinfo(ai3);
|
|
tested_for_getaddrinfo_hacks=1;
|
|
}
|
|
|
|
static inline int
|
|
need_numeric_port_hack(void)
|
|
{
|
|
if (!tested_for_getaddrinfo_hacks)
|
|
test_for_getaddrinfo_hacks();
|
|
return need_numeric_port_hack_;
|
|
}
|
|
|
|
static inline int
|
|
need_socktype_protocol_hack(void)
|
|
{
|
|
if (!tested_for_getaddrinfo_hacks)
|
|
test_for_getaddrinfo_hacks();
|
|
return need_socktype_protocol_hack_;
|
|
}
|
|
|
|
static void
|
|
apply_numeric_port_hack(int port, struct evutil_addrinfo **ai)
|
|
{
|
|
/* Now we run through the list and set the ports on all of the
|
|
* results where ports would make sense. */
|
|
for ( ; *ai; ai = &(*ai)->ai_next) {
|
|
struct sockaddr *sa = (*ai)->ai_addr;
|
|
if (sa && sa->sa_family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in*)sa;
|
|
sin->sin_port = htons(port);
|
|
} else if (sa && sa->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
|
|
sin6->sin6_port = htons(port);
|
|
} else {
|
|
/* A numeric port makes no sense here; remove this one
|
|
* from the list. */
|
|
struct evutil_addrinfo *victim = *ai;
|
|
*ai = victim->ai_next;
|
|
victim->ai_next = NULL;
|
|
freeaddrinfo(victim);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
apply_socktype_protocol_hack(struct evutil_addrinfo *ai)
|
|
{
|
|
struct evutil_addrinfo *ai_new;
|
|
for (; ai; ai = ai->ai_next) {
|
|
evutil_getaddrinfo_infer_protocols(ai);
|
|
if (ai->ai_socktype || ai->ai_protocol)
|
|
continue;
|
|
ai_new = mm_malloc(sizeof(*ai_new));
|
|
if (!ai_new)
|
|
return -1;
|
|
memcpy(ai_new, ai, sizeof(*ai_new));
|
|
ai->ai_socktype = SOCK_STREAM;
|
|
ai->ai_protocol = IPPROTO_TCP;
|
|
ai_new->ai_socktype = SOCK_DGRAM;
|
|
ai_new->ai_protocol = IPPROTO_UDP;
|
|
|
|
ai_new->ai_next = ai->ai_next;
|
|
ai->ai_next = ai_new;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
evutil_getaddrinfo(const char *nodename, const char *servname,
|
|
const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res)
|
|
{
|
|
#ifdef USE_NATIVE_GETADDRINFO
|
|
struct evutil_addrinfo hints;
|
|
int portnum=-1, need_np_hack, err;
|
|
|
|
if (hints_in) {
|
|
memcpy(&hints, hints_in, sizeof(hints));
|
|
} else {
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = PF_UNSPEC;
|
|
}
|
|
|
|
#ifndef AI_ADDRCONFIG
|
|
/* Not every system has AI_ADDRCONFIG, so fake it. */
|
|
if (hints.ai_family == PF_UNSPEC &&
|
|
(hints.ai_flags & EVUTIL_AI_ADDRCONFIG)) {
|
|
evutil_adjust_hints_for_addrconfig_(&hints);
|
|
}
|
|
#endif
|
|
|
|
#ifndef AI_NUMERICSERV
|
|
/* Not every system has AI_NUMERICSERV, so fake it. */
|
|
if (hints.ai_flags & EVUTIL_AI_NUMERICSERV) {
|
|
if (servname && parse_numeric_servname(servname)<0)
|
|
return EVUTIL_EAI_NONAME;
|
|
}
|
|
#endif
|
|
|
|
/* Enough operating systems handle enough common non-resolve
|
|
* cases here weirdly enough that we are better off just
|
|
* overriding them. For example:
|
|
*
|
|
* - Windows doesn't like to infer the protocol from the
|
|
* socket type, or fill in socket or protocol types much at
|
|
* all. It also seems to do its own broken implicit
|
|
* always-on version of AI_ADDRCONFIG that keeps it from
|
|
* ever resolving even a literal IPv6 address when
|
|
* ai_addrtype is PF_UNSPEC.
|
|
*/
|
|
#ifdef _WIN32
|
|
{
|
|
int tmp_port;
|
|
err = evutil_getaddrinfo_common_(nodename,servname,&hints,
|
|
res, &tmp_port);
|
|
if (err == 0 ||
|
|
err == EVUTIL_EAI_MEMORY ||
|
|
err == EVUTIL_EAI_NONAME)
|
|
return err;
|
|
/* If we make it here, the system getaddrinfo can
|
|
* have a crack at it. */
|
|
}
|
|
#endif
|
|
|
|
/* See documentation for need_numeric_port_hack above.*/
|
|
need_np_hack = need_numeric_port_hack() && servname && !hints.ai_socktype
|
|
&& ((portnum=parse_numeric_servname(servname)) >= 0);
|
|
if (need_np_hack) {
|
|
if (!nodename)
|
|
return evutil_getaddrinfo_common_(
|
|
NULL,servname,&hints, res, &portnum);
|
|
servname = NULL;
|
|
}
|
|
|
|
if (need_socktype_protocol_hack()) {
|
|
evutil_getaddrinfo_infer_protocols(&hints);
|
|
}
|
|
|
|
/* Make sure that we didn't actually steal any AI_FLAGS values that
|
|
* the system is using. (This is a constant expression, and should ge
|
|
* optimized out.)
|
|
*
|
|
* XXXX Turn this into a compile-time failure rather than a run-time
|
|
* failure.
|
|
*/
|
|
EVUTIL_ASSERT((ALL_NONNATIVE_AI_FLAGS & ALL_NATIVE_AI_FLAGS) == 0);
|
|
|
|
/* Clear any flags that only libevent understands. */
|
|
hints.ai_flags &= ~ALL_NONNATIVE_AI_FLAGS;
|
|
|
|
err = getaddrinfo(nodename, servname, &hints, res);
|
|
if (need_np_hack)
|
|
apply_numeric_port_hack(portnum, res);
|
|
|
|
if (need_socktype_protocol_hack()) {
|
|
if (apply_socktype_protocol_hack(*res) < 0) {
|
|
evutil_freeaddrinfo(*res);
|
|
*res = NULL;
|
|
return EVUTIL_EAI_MEMORY;
|
|
}
|
|
}
|
|
return err;
|
|
#else
|
|
int port=0, err;
|
|
struct hostent *ent = NULL;
|
|
struct evutil_addrinfo hints;
|
|
|
|
if (hints_in) {
|
|
memcpy(&hints, hints_in, sizeof(hints));
|
|
} else {
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = PF_UNSPEC;
|
|
}
|
|
|
|
evutil_adjust_hints_for_addrconfig_(&hints);
|
|
|
|
err = evutil_getaddrinfo_common_(nodename, servname, &hints, res, &port);
|
|
if (err != EVUTIL_EAI_NEED_RESOLVE) {
|
|
/* We either succeeded or failed. No need to continue */
|
|
return err;
|
|
}
|
|
|
|
err = 0;
|
|
/* Use any of the various gethostbyname_r variants as available. */
|
|
{
|
|
#ifdef EVENT__HAVE_GETHOSTBYNAME_R_6_ARG
|
|
/* This one is what glibc provides. */
|
|
char buf[2048];
|
|
struct hostent hostent;
|
|
int r;
|
|
r = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), &ent,
|
|
&err);
|
|
#elif defined(EVENT__HAVE_GETHOSTBYNAME_R_5_ARG)
|
|
char buf[2048];
|
|
struct hostent hostent;
|
|
ent = gethostbyname_r(nodename, &hostent, buf, sizeof(buf),
|
|
&err);
|
|
#elif defined(EVENT__HAVE_GETHOSTBYNAME_R_3_ARG)
|
|
struct hostent_data data;
|
|
struct hostent hostent;
|
|
memset(&data, 0, sizeof(data));
|
|
err = gethostbyname_r(nodename, &hostent, &data);
|
|
ent = err ? NULL : &hostent;
|
|
#else
|
|
/* fall back to gethostbyname. */
|
|
/* XXXX This needs a lock everywhere but Windows. */
|
|
ent = gethostbyname(nodename);
|
|
#ifdef _WIN32
|
|
err = WSAGetLastError();
|
|
#else
|
|
err = h_errno;
|
|
#endif
|
|
#endif
|
|
|
|
/* Now we have either ent or err set. */
|
|
if (!ent) {
|
|
/* XXX is this right for windows ? */
|
|
switch (err) {
|
|
case TRY_AGAIN:
|
|
return EVUTIL_EAI_AGAIN;
|
|
case NO_RECOVERY:
|
|
default:
|
|
return EVUTIL_EAI_FAIL;
|
|
case HOST_NOT_FOUND:
|
|
return EVUTIL_EAI_NONAME;
|
|
case NO_ADDRESS:
|
|
#if NO_DATA != NO_ADDRESS
|
|
case NO_DATA:
|
|
#endif
|
|
return EVUTIL_EAI_NODATA;
|
|
}
|
|
}
|
|
|
|
if (ent->h_addrtype != hints.ai_family &&
|
|
hints.ai_family != PF_UNSPEC) {
|
|
/* This wasn't the type we were hoping for. Too bad
|
|
* we never had a chance to ask gethostbyname for what
|
|
* we wanted. */
|
|
return EVUTIL_EAI_NONAME;
|
|
}
|
|
|
|
/* Make sure we got _some_ answers. */
|
|
if (ent->h_length == 0)
|
|
return EVUTIL_EAI_NODATA;
|
|
|
|
/* If we got an address type we don't know how to make a
|
|
sockaddr for, give up. */
|
|
if (ent->h_addrtype != PF_INET && ent->h_addrtype != PF_INET6)
|
|
return EVUTIL_EAI_FAMILY;
|
|
|
|
*res = addrinfo_from_hostent(ent, port, &hints);
|
|
if (! *res)
|
|
return EVUTIL_EAI_MEMORY;
|
|
}
|
|
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
evutil_freeaddrinfo(struct evutil_addrinfo *ai)
|
|
{
|
|
#ifdef EVENT__HAVE_GETADDRINFO
|
|
if (!(ai->ai_flags & EVUTIL_AI_LIBEVENT_ALLOCATED)) {
|
|
freeaddrinfo(ai);
|
|
return;
|
|
}
|
|
#endif
|
|
while (ai) {
|
|
struct evutil_addrinfo *next = ai->ai_next;
|
|
if (ai->ai_canonname)
|
|
mm_free(ai->ai_canonname);
|
|
mm_free(ai);
|
|
ai = next;
|
|
}
|
|
}
|
|
|
|
static evdns_getaddrinfo_fn evdns_getaddrinfo_impl = NULL;
|
|
static evdns_getaddrinfo_cancel_fn evdns_getaddrinfo_cancel_impl = NULL;
|
|
|
|
void
|
|
evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn)
|
|
{
|
|
if (!evdns_getaddrinfo_impl)
|
|
evdns_getaddrinfo_impl = fn;
|
|
}
|
|
void
|
|
evutil_set_evdns_getaddrinfo_cancel_fn_(evdns_getaddrinfo_cancel_fn fn)
|
|
{
|
|
if (!evdns_getaddrinfo_cancel_impl)
|
|
evdns_getaddrinfo_cancel_impl = fn;
|
|
}
|
|
|
|
/* Internal helper function: act like evdns_getaddrinfo if dns_base is set;
|
|
* otherwise do a blocking resolve and pass the result to the callback in the
|
|
* way that evdns_getaddrinfo would.
|
|
*/
|
|
struct evdns_getaddrinfo_request *evutil_getaddrinfo_async_(
|
|
struct evdns_base *dns_base,
|
|
const char *nodename, const char *servname,
|
|
const struct evutil_addrinfo *hints_in,
|
|
void (*cb)(int, struct evutil_addrinfo *, void *), void *arg)
|
|
{
|
|
if (dns_base && evdns_getaddrinfo_impl) {
|
|
return evdns_getaddrinfo_impl(
|
|
dns_base, nodename, servname, hints_in, cb, arg);
|
|
} else {
|
|
struct evutil_addrinfo *ai=NULL;
|
|
int err;
|
|
err = evutil_getaddrinfo(nodename, servname, hints_in, &ai);
|
|
cb(err, ai, arg);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void evutil_getaddrinfo_cancel_async_(struct evdns_getaddrinfo_request *data)
|
|
{
|
|
if (evdns_getaddrinfo_cancel_impl && data) {
|
|
evdns_getaddrinfo_cancel_impl(data);
|
|
}
|
|
}
|
|
|
|
const char *
|
|
evutil_gai_strerror(int err)
|
|
{
|
|
/* As a sneaky side-benefit, this case statement will get most
|
|
* compilers to tell us if any of the error codes we defined
|
|
* conflict with the platform's native error codes. */
|
|
switch (err) {
|
|
case EVUTIL_EAI_CANCEL:
|
|
return "Request canceled";
|
|
case 0:
|
|
return "No error";
|
|
|
|
case EVUTIL_EAI_ADDRFAMILY:
|
|
return "address family for nodename not supported";
|
|
case EVUTIL_EAI_AGAIN:
|
|
return "temporary failure in name resolution";
|
|
case EVUTIL_EAI_BADFLAGS:
|
|
return "invalid value for ai_flags";
|
|
case EVUTIL_EAI_FAIL:
|
|
return "non-recoverable failure in name resolution";
|
|
case EVUTIL_EAI_FAMILY:
|
|
return "ai_family not supported";
|
|
case EVUTIL_EAI_MEMORY:
|
|
return "memory allocation failure";
|
|
case EVUTIL_EAI_NODATA:
|
|
return "no address associated with nodename";
|
|
case EVUTIL_EAI_NONAME:
|
|
return "nodename nor servname provided, or not known";
|
|
case EVUTIL_EAI_SERVICE:
|
|
return "servname not supported for ai_socktype";
|
|
case EVUTIL_EAI_SOCKTYPE:
|
|
return "ai_socktype not supported";
|
|
case EVUTIL_EAI_SYSTEM:
|
|
return "system error";
|
|
default:
|
|
#if defined(USE_NATIVE_GETADDRINFO) && defined(_WIN32)
|
|
return gai_strerrorA(err);
|
|
#elif defined(USE_NATIVE_GETADDRINFO)
|
|
return gai_strerror(err);
|
|
#else
|
|
return "Unknown error code";
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
/* destructively remove a trailing line terminator from s */
|
|
static void
|
|
chomp (char *s)
|
|
{
|
|
size_t len;
|
|
if (s && (len = strlen (s)) > 0 && s[len - 1] == '\n') {
|
|
s[--len] = 0;
|
|
if (len > 0 && s[len - 1] == '\r')
|
|
s[--len] = 0;
|
|
}
|
|
}
|
|
|
|
/* FormatMessage returns allocated strings, but evutil_socket_error_to_string
|
|
* is supposed to return a string which is good indefinitely without having
|
|
* to be freed. To make this work without leaking memory, we cache the
|
|
* string the first time FormatMessage is called on a particular error
|
|
* code, and then return the cached string on subsequent calls with the
|
|
* same code. The strings aren't freed until libevent_global_shutdown
|
|
* (or never). We use a linked list to cache the errors, because we
|
|
* only expect there to be a few dozen, and that should be fast enough.
|
|
*/
|
|
|
|
struct cached_sock_errs_entry {
|
|
HT_ENTRY(cached_sock_errs_entry) node;
|
|
DWORD code;
|
|
char *msg; /* allocated with LocalAlloc; free with LocalFree */
|
|
};
|
|
|
|
static inline unsigned
|
|
hash_cached_sock_errs(const struct cached_sock_errs_entry *e)
|
|
{
|
|
/* Use Murmur3's 32-bit finalizer as an integer hash function */
|
|
DWORD h = e->code;
|
|
h ^= h >> 16;
|
|
h *= 0x85ebca6b;
|
|
h ^= h >> 13;
|
|
h *= 0xc2b2ae35;
|
|
h ^= h >> 16;
|
|
return h;
|
|
}
|
|
|
|
static inline int
|
|
eq_cached_sock_errs(const struct cached_sock_errs_entry *a,
|
|
const struct cached_sock_errs_entry *b)
|
|
{
|
|
return a->code == b->code;
|
|
}
|
|
|
|
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
|
static void *windows_socket_errors_lock_ = NULL;
|
|
#endif
|
|
|
|
static HT_HEAD(cached_sock_errs_map, cached_sock_errs_entry)
|
|
windows_socket_errors = HT_INITIALIZER();
|
|
|
|
HT_PROTOTYPE(cached_sock_errs_map,
|
|
cached_sock_errs_entry,
|
|
node,
|
|
hash_cached_sock_errs,
|
|
eq_cached_sock_errs);
|
|
|
|
HT_GENERATE(cached_sock_errs_map,
|
|
cached_sock_errs_entry,
|
|
node,
|
|
hash_cached_sock_errs,
|
|
eq_cached_sock_errs,
|
|
0.5,
|
|
mm_malloc,
|
|
mm_realloc,
|
|
mm_free);
|
|
|
|
/** Equivalent to strerror, but for windows socket errors. */
|
|
const char *
|
|
evutil_socket_error_to_string(int errcode)
|
|
{
|
|
struct cached_sock_errs_entry *errs, *newerr, find;
|
|
char *msg = NULL;
|
|
|
|
EVLOCK_LOCK(windows_socket_errors_lock_, 0);
|
|
|
|
find.code = errcode;
|
|
errs = HT_FIND(cached_sock_errs_map, &windows_socket_errors, &find);
|
|
if (errs) {
|
|
msg = errs->msg;
|
|
goto done;
|
|
}
|
|
|
|
if (0 != FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
|
|
FORMAT_MESSAGE_IGNORE_INSERTS |
|
|
FORMAT_MESSAGE_ALLOCATE_BUFFER,
|
|
NULL, errcode, 0, (char *)&msg, 0, NULL))
|
|
chomp (msg); /* because message has trailing newline */
|
|
else {
|
|
size_t len = 50;
|
|
/* use LocalAlloc because FormatMessage does */
|
|
msg = LocalAlloc(LMEM_FIXED, len);
|
|
if (!msg) {
|
|
msg = (char *)"LocalAlloc failed during Winsock error";
|
|
goto done;
|
|
}
|
|
evutil_snprintf(msg, len, "winsock error 0x%08x", errcode);
|
|
}
|
|
|
|
newerr = (struct cached_sock_errs_entry *)
|
|
mm_malloc(sizeof (struct cached_sock_errs_entry));
|
|
|
|
if (!newerr) {
|
|
LocalFree(msg);
|
|
msg = (char *)"malloc failed during Winsock error";
|
|
goto done;
|
|
}
|
|
|
|
newerr->code = errcode;
|
|
newerr->msg = msg;
|
|
HT_INSERT(cached_sock_errs_map, &windows_socket_errors, newerr);
|
|
|
|
done:
|
|
EVLOCK_UNLOCK(windows_socket_errors_lock_, 0);
|
|
|
|
return msg;
|
|
}
|
|
|
|
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
|
int
|
|
evutil_global_setup_locks_(const int enable_locks)
|
|
{
|
|
EVTHREAD_SETUP_GLOBAL_LOCK(windows_socket_errors_lock_, 0);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
evutil_free_sock_err_globals(void)
|
|
{
|
|
struct cached_sock_errs_entry **errs, *tofree;
|
|
|
|
for (errs = HT_START(cached_sock_errs_map, &windows_socket_errors)
|
|
; errs; ) {
|
|
tofree = *errs;
|
|
errs = HT_NEXT_RMV(cached_sock_errs_map,
|
|
&windows_socket_errors,
|
|
errs);
|
|
LocalFree(tofree->msg);
|
|
mm_free(tofree);
|
|
}
|
|
|
|
HT_CLEAR(cached_sock_errs_map, &windows_socket_errors);
|
|
|
|
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
|
if (windows_socket_errors_lock_ != NULL) {
|
|
EVTHREAD_FREE_LOCK(windows_socket_errors_lock_, 0);
|
|
windows_socket_errors_lock_ = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#else
|
|
|
|
#ifndef EVENT__DISABLE_THREAD_SUPPORT
|
|
int
|
|
evutil_global_setup_locks_(const int enable_locks)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
evutil_free_sock_err_globals(void)
|
|
{
|
|
}
|
|
|
|
#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)
|
|
{
|
|
int r;
|
|
if (!buflen)
|
|
return 0;
|
|
#if defined(_MSC_VER) || defined(_WIN32)
|
|
r = _vsnprintf(buf, buflen, format, ap);
|
|
if (r < 0)
|
|
r = _vscprintf(format, ap);
|
|
#elif defined(sgi)
|
|
/* Make sure we always use the correct vsnprintf on IRIX */
|
|
extern int _xpg5_vsnprintf(char * __restrict,
|
|
__SGI_LIBC_NAMESPACE_QUALIFIER size_t,
|
|
const char * __restrict, /* va_list */ char *);
|
|
|
|
r = _xpg5_vsnprintf(buf, buflen, format, ap);
|
|
#else
|
|
r = vsnprintf(buf, buflen, format, ap);
|
|
#endif
|
|
buf[buflen-1] = '\0';
|
|
return r;
|
|
}
|
|
|
|
#define USE_INTERNAL_NTOP
|
|
#define USE_INTERNAL_PTON
|
|
|
|
const char *
|
|
evutil_inet_ntop(int af, const void *src, char *dst, size_t len)
|
|
{
|
|
#if defined(EVENT__HAVE_INET_NTOP) && !defined(USE_INTERNAL_NTOP)
|
|
return inet_ntop(af, src, dst, len);
|
|
#else
|
|
if (af == AF_INET) {
|
|
const struct in_addr *in = src;
|
|
const ev_uint32_t a = ntohl(in->s_addr);
|
|
int r;
|
|
r = evutil_snprintf(dst, len, "%d.%d.%d.%d",
|
|
(int)(ev_uint8_t)((a>>24)&0xff),
|
|
(int)(ev_uint8_t)((a>>16)&0xff),
|
|
(int)(ev_uint8_t)((a>>8 )&0xff),
|
|
(int)(ev_uint8_t)((a )&0xff));
|
|
if (r<0||(size_t)r>=len)
|
|
return NULL;
|
|
else
|
|
return dst;
|
|
#ifdef AF_INET6
|
|
} else if (af == AF_INET6) {
|
|
const struct in6_addr *addr = src;
|
|
char buf[64], *cp;
|
|
int longestGapLen = 0, longestGapPos = -1, i,
|
|
curGapPos = -1, curGapLen = 0;
|
|
ev_uint16_t words[8];
|
|
for (i = 0; i < 8; ++i) {
|
|
words[i] =
|
|
(((ev_uint16_t)addr->s6_addr[2*i])<<8) + addr->s6_addr[2*i+1];
|
|
}
|
|
if (words[0] == 0 && words[1] == 0 && words[2] == 0 && words[3] == 0 &&
|
|
words[4] == 0 && ((words[5] == 0 && words[6] && words[7]) ||
|
|
(words[5] == 0xffff))) {
|
|
/* This is an IPv4 address. */
|
|
if (words[5] == 0) {
|
|
evutil_snprintf(buf, sizeof(buf), "::%d.%d.%d.%d",
|
|
addr->s6_addr[12], addr->s6_addr[13],
|
|
addr->s6_addr[14], addr->s6_addr[15]);
|
|
} else {
|
|
evutil_snprintf(buf, sizeof(buf), "::%x:%d.%d.%d.%d", words[5],
|
|
addr->s6_addr[12], addr->s6_addr[13],
|
|
addr->s6_addr[14], addr->s6_addr[15]);
|
|
}
|
|
if (strlen(buf) > len)
|
|
return NULL;
|
|
strlcpy(dst, buf, len);
|
|
return dst;
|
|
}
|
|
i = 0;
|
|
while (i < 8) {
|
|
if (words[i] == 0) {
|
|
curGapPos = i++;
|
|
curGapLen = 1;
|
|
while (i<8 && words[i] == 0) {
|
|
++i; ++curGapLen;
|
|
}
|
|
if (curGapLen > longestGapLen) {
|
|
longestGapPos = curGapPos;
|
|
longestGapLen = curGapLen;
|
|
}
|
|
} else {
|
|
++i;
|
|
}
|
|
}
|
|
if (longestGapLen<=1)
|
|
longestGapPos = -1;
|
|
|
|
cp = buf;
|
|
for (i = 0; i < 8; ++i) {
|
|
if (words[i] == 0 && longestGapPos == i) {
|
|
if (i == 0)
|
|
*cp++ = ':';
|
|
*cp++ = ':';
|
|
while (i < 8 && words[i] == 0)
|
|
++i;
|
|
--i; /* to compensate for loop increment. */
|
|
} else {
|
|
evutil_snprintf(cp,
|
|
sizeof(buf)-(cp-buf), "%x", (unsigned)words[i]);
|
|
cp += strlen(cp);
|
|
if (i != 7)
|
|
*cp++ = ':';
|
|
}
|
|
}
|
|
*cp = '\0';
|
|
if (strlen(buf) > len)
|
|
return NULL;
|
|
strlcpy(dst, buf, len);
|
|
return dst;
|
|
#endif
|
|
} else {
|
|
return NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int
|
|
evutil_inet_pton_scope(int af, const char *src, void *dst, unsigned *indexp)
|
|
{
|
|
int r;
|
|
unsigned if_index;
|
|
char *check, *cp, *tmp_src;
|
|
|
|
*indexp = 0; /* Reasonable default */
|
|
|
|
/* Bail out if not IPv6 */
|
|
if (af != AF_INET6)
|
|
return evutil_inet_pton(af, src, dst);
|
|
|
|
cp = strchr(src, '%');
|
|
|
|
/* Bail out if no zone ID */
|
|
if (cp == NULL)
|
|
return evutil_inet_pton(af, src, dst);
|
|
|
|
if_index = if_nametoindex(cp + 1);
|
|
if (if_index == 0) {
|
|
/* Could be numeric */
|
|
if_index = strtoul(cp + 1, &check, 10);
|
|
if (check[0] != '\0')
|
|
return 0;
|
|
}
|
|
*indexp = if_index;
|
|
tmp_src = mm_strdup(src);
|
|
cp = strchr(tmp_src, '%');
|
|
*cp = '\0';
|
|
r = evutil_inet_pton(af, tmp_src, dst);
|
|
free(tmp_src);
|
|
return r;
|
|
}
|
|
|
|
int
|
|
evutil_inet_pton(int af, const char *src, void *dst)
|
|
{
|
|
#if defined(EVENT__HAVE_INET_PTON) && !defined(USE_INTERNAL_PTON)
|
|
return inet_pton(af, src, dst);
|
|
#else
|
|
if (af == AF_INET) {
|
|
unsigned a,b,c,d;
|
|
char more;
|
|
struct in_addr *addr = dst;
|
|
if (sscanf(src, "%u.%u.%u.%u%c", &a,&b,&c,&d,&more) != 4)
|
|
return 0;
|
|
if (a > 255) return 0;
|
|
if (b > 255) return 0;
|
|
if (c > 255) return 0;
|
|
if (d > 255) return 0;
|
|
addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d);
|
|
return 1;
|
|
#ifdef AF_INET6
|
|
} else if (af == AF_INET6) {
|
|
struct in6_addr *out = dst;
|
|
ev_uint16_t words[8];
|
|
int gapPos = -1, i, setWords=0;
|
|
const char *dot = strchr(src, '.');
|
|
const char *eow; /* end of words. */
|
|
if (dot == src)
|
|
return 0;
|
|
else if (!dot)
|
|
eow = src+strlen(src);
|
|
else {
|
|
unsigned byte1,byte2,byte3,byte4;
|
|
char more;
|
|
for (eow = dot-1; eow >= src && EVUTIL_ISDIGIT_(*eow); --eow)
|
|
;
|
|
++eow;
|
|
|
|
/* We use "scanf" because some platform inet_aton()s are too lax
|
|
* about IPv4 addresses of the form "1.2.3" */
|
|
if (sscanf(eow, "%u.%u.%u.%u%c",
|
|
&byte1,&byte2,&byte3,&byte4,&more) != 4)
|
|
return 0;
|
|
|
|
if (byte1 > 255 ||
|
|
byte2 > 255 ||
|
|
byte3 > 255 ||
|
|
byte4 > 255)
|
|
return 0;
|
|
|
|
words[6] = (byte1<<8) | byte2;
|
|
words[7] = (byte3<<8) | byte4;
|
|
setWords += 2;
|
|
}
|
|
|
|
i = 0;
|
|
while (src < eow) {
|
|
if (i > 7)
|
|
return 0;
|
|
if (EVUTIL_ISXDIGIT_(*src)) {
|
|
char *next;
|
|
long r = strtol(src, &next, 16);
|
|
if (next > 4+src)
|
|
return 0;
|
|
if (next == src)
|
|
return 0;
|
|
if (r<0 || r>65536)
|
|
return 0;
|
|
|
|
words[i++] = (ev_uint16_t)r;
|
|
setWords++;
|
|
src = next;
|
|
if (*src != ':' && src != eow)
|
|
return 0;
|
|
++src;
|
|
} else if (*src == ':' && i > 0 && gapPos==-1) {
|
|
gapPos = i;
|
|
++src;
|
|
} else if (*src == ':' && i == 0 && src[1] == ':' && gapPos==-1) {
|
|
gapPos = i;
|
|
src += 2;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (setWords > 8 ||
|
|
(setWords == 8 && gapPos != -1) ||
|
|
(setWords < 8 && gapPos == -1))
|
|
return 0;
|
|
|
|
if (gapPos >= 0) {
|
|
int nToMove = setWords - (dot ? 2 : 0) - gapPos;
|
|
int gapLen = 8 - setWords;
|
|
/* assert(nToMove >= 0); */
|
|
if (nToMove < 0)
|
|
return -1; /* should be impossible */
|
|
memmove(&words[gapPos+gapLen], &words[gapPos],
|
|
sizeof(ev_uint16_t)*nToMove);
|
|
memset(&words[gapPos], 0, sizeof(ev_uint16_t)*gapLen);
|
|
}
|
|
for (i = 0; i < 8; ++i) {
|
|
out->s6_addr[2*i ] = words[i] >> 8;
|
|
out->s6_addr[2*i+1] = words[i] & 0xff;
|
|
}
|
|
|
|
return 1;
|
|
#endif
|
|
} else {
|
|
return -1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int
|
|
evutil_parse_sockaddr_port(const char *ip_as_string, struct sockaddr *out, int *outlen)
|
|
{
|
|
int port;
|
|
unsigned int if_index;
|
|
char buf[128];
|
|
const char *cp, *addr_part, *port_part;
|
|
int is_ipv6;
|
|
/* recognized formats are:
|
|
* [ipv6]:port
|
|
* ipv6
|
|
* [ipv6]
|
|
* ipv4:port
|
|
* ipv4
|
|
*/
|
|
|
|
cp = strchr(ip_as_string, ':');
|
|
if (*ip_as_string == '[') {
|
|
size_t len;
|
|
if (!(cp = strchr(ip_as_string, ']'))) {
|
|
return -1;
|
|
}
|
|
len = ( cp-(ip_as_string + 1) );
|
|
if (len > sizeof(buf)-1) {
|
|
return -1;
|
|
}
|
|
memcpy(buf, ip_as_string+1, len);
|
|
buf[len] = '\0';
|
|
addr_part = buf;
|
|
if (cp[1] == ':')
|
|
port_part = cp+2;
|
|
else
|
|
port_part = NULL;
|
|
is_ipv6 = 1;
|
|
} else if (cp && strchr(cp+1, ':')) {
|
|
is_ipv6 = 1;
|
|
addr_part = ip_as_string;
|
|
port_part = NULL;
|
|
} else if (cp) {
|
|
is_ipv6 = 0;
|
|
if (cp - ip_as_string > (int)sizeof(buf)-1) {
|
|
return -1;
|
|
}
|
|
memcpy(buf, ip_as_string, cp-ip_as_string);
|
|
buf[cp-ip_as_string] = '\0';
|
|
addr_part = buf;
|
|
port_part = cp+1;
|
|
} else {
|
|
addr_part = ip_as_string;
|
|
port_part = NULL;
|
|
is_ipv6 = 0;
|
|
}
|
|
|
|
if (port_part == NULL) {
|
|
port = 0;
|
|
} else {
|
|
port = atoi(port_part);
|
|
if (port <= 0 || port > 65535) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (!addr_part)
|
|
return -1; /* Should be impossible. */
|
|
#ifdef AF_INET6
|
|
if (is_ipv6)
|
|
{
|
|
struct sockaddr_in6 sin6;
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
#ifdef EVENT__HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN
|
|
sin6.sin6_len = sizeof(sin6);
|
|
#endif
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_port = htons(port);
|
|
if (1 != evutil_inet_pton_scope(
|
|
AF_INET6, addr_part, &sin6.sin6_addr, &if_index)) {
|
|
return -1;
|
|
}
|
|
if ((int)sizeof(sin6) > *outlen)
|
|
return -1;
|
|
sin6.sin6_scope_id = if_index;
|
|
memset(out, 0, *outlen);
|
|
memcpy(out, &sin6, sizeof(sin6));
|
|
*outlen = sizeof(sin6);
|
|
return 0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
struct sockaddr_in sin;
|
|
memset(&sin, 0, sizeof(sin));
|
|
#ifdef EVENT__HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
|
|
sin.sin_len = sizeof(sin);
|
|
#endif
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(port);
|
|
if (1 != evutil_inet_pton(AF_INET, addr_part, &sin.sin_addr))
|
|
return -1;
|
|
if ((int)sizeof(sin) > *outlen)
|
|
return -1;
|
|
memset(out, 0, *outlen);
|
|
memcpy(out, &sin, sizeof(sin));
|
|
*outlen = sizeof(sin);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
const char *
|
|
evutil_format_sockaddr_port_(const struct sockaddr *sa, char *out, size_t outlen)
|
|
{
|
|
char b[128];
|
|
const char *res=NULL;
|
|
int port;
|
|
if (sa->sa_family == AF_INET) {
|
|
const struct sockaddr_in *sin = (const struct sockaddr_in*)sa;
|
|
res = evutil_inet_ntop(AF_INET, &sin->sin_addr,b,sizeof(b));
|
|
port = ntohs(sin->sin_port);
|
|
if (res) {
|
|
evutil_snprintf(out, outlen, "%s:%d", b, port);
|
|
return out;
|
|
}
|
|
} else if (sa->sa_family == AF_INET6) {
|
|
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6*)sa;
|
|
res = evutil_inet_ntop(AF_INET6, &sin6->sin6_addr,b,sizeof(b));
|
|
port = ntohs(sin6->sin6_port);
|
|
if (res) {
|
|
evutil_snprintf(out, outlen, "[%s]:%d", b, port);
|
|
return out;
|
|
}
|
|
}
|
|
|
|
evutil_snprintf(out, outlen, "<addr with socktype %d>",
|
|
(int)sa->sa_family);
|
|
return out;
|
|
}
|
|
|
|
int
|
|
evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
|
|
int include_port)
|
|
{
|
|
int r;
|
|
if (0 != (r = (sa1->sa_family - sa2->sa_family)))
|
|
return r;
|
|
|
|
if (sa1->sa_family == AF_INET) {
|
|
const struct sockaddr_in *sin1, *sin2;
|
|
sin1 = (const struct sockaddr_in *)sa1;
|
|
sin2 = (const struct sockaddr_in *)sa2;
|
|
if (sin1->sin_addr.s_addr < sin2->sin_addr.s_addr)
|
|
return -1;
|
|
else if (sin1->sin_addr.s_addr > sin2->sin_addr.s_addr)
|
|
return 1;
|
|
else if (include_port &&
|
|
(r = ((int)sin1->sin_port - (int)sin2->sin_port)))
|
|
return r;
|
|
else
|
|
return 0;
|
|
}
|
|
#ifdef AF_INET6
|
|
else if (sa1->sa_family == AF_INET6) {
|
|
const struct sockaddr_in6 *sin1, *sin2;
|
|
sin1 = (const struct sockaddr_in6 *)sa1;
|
|
sin2 = (const struct sockaddr_in6 *)sa2;
|
|
if ((r = memcmp(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16)))
|
|
return r;
|
|
else if (include_port &&
|
|
(r = ((int)sin1->sin6_port - (int)sin2->sin6_port)))
|
|
return r;
|
|
else
|
|
return 0;
|
|
}
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
/* Tables to implement ctypes-replacement EVUTIL_IS*() functions. Each table
|
|
* has 256 bits to look up whether a character is in some set or not. This
|
|
* fails on non-ASCII platforms, but so does every other place where we
|
|
* take a char and write it onto the network.
|
|
**/
|
|
static const ev_uint32_t EVUTIL_ISALPHA_TABLE[8] =
|
|
{ 0, 0, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISALNUM_TABLE[8] =
|
|
{ 0, 0x3ff0000, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISSPACE_TABLE[8] = { 0x3e00, 0x1, 0, 0, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISXDIGIT_TABLE[8] =
|
|
{ 0, 0x3ff0000, 0x7e, 0x7e, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISDIGIT_TABLE[8] = { 0, 0x3ff0000, 0, 0, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISPRINT_TABLE[8] =
|
|
{ 0, 0xffffffff, 0xffffffff, 0x7fffffff, 0, 0, 0, 0x0 };
|
|
static const ev_uint32_t EVUTIL_ISUPPER_TABLE[8] = { 0, 0, 0x7fffffe, 0, 0, 0, 0, 0 };
|
|
static const ev_uint32_t EVUTIL_ISLOWER_TABLE[8] = { 0, 0, 0, 0x7fffffe, 0, 0, 0, 0 };
|
|
/* Upper-casing and lowercasing tables to map characters to upper/lowercase
|
|
* equivalents. */
|
|
static const unsigned char EVUTIL_TOUPPER_TABLE[256] = {
|
|
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
|
|
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
|
|
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
|
|
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
|
|
64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
|
|
80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,
|
|
96,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
|
|
80,81,82,83,84,85,86,87,88,89,90,123,124,125,126,127,
|
|
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
|
|
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
|
|
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
|
|
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
|
|
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
|
|
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
|
|
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
|
|
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,
|
|
};
|
|
static const unsigned char EVUTIL_TOLOWER_TABLE[256] = {
|
|
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
|
|
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
|
|
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
|
|
48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
|
|
64,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
|
|
112,113,114,115,116,117,118,119,120,121,122,91,92,93,94,95,
|
|
96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
|
|
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
|
|
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
|
|
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
|
|
160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
|
|
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
|
|
192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
|
|
208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
|
|
224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
|
|
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,
|
|
};
|
|
|
|
#define IMPL_CTYPE_FN(name) \
|
|
int EVUTIL_##name##_(char c) { \
|
|
ev_uint8_t u = c; \
|
|
return !!(EVUTIL_##name##_TABLE[(u >> 5) & 7] & (1U << (u & 31))); \
|
|
}
|
|
IMPL_CTYPE_FN(ISALPHA)
|
|
IMPL_CTYPE_FN(ISALNUM)
|
|
IMPL_CTYPE_FN(ISSPACE)
|
|
IMPL_CTYPE_FN(ISDIGIT)
|
|
IMPL_CTYPE_FN(ISXDIGIT)
|
|
IMPL_CTYPE_FN(ISPRINT)
|
|
IMPL_CTYPE_FN(ISLOWER)
|
|
IMPL_CTYPE_FN(ISUPPER)
|
|
|
|
char EVUTIL_TOLOWER_(char c)
|
|
{
|
|
return ((char)EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c]);
|
|
}
|
|
char EVUTIL_TOUPPER_(char c)
|
|
{
|
|
return ((char)EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c]);
|
|
}
|
|
int
|
|
evutil_ascii_strcasecmp(const char *s1, const char *s2)
|
|
{
|
|
char c1, c2;
|
|
while (1) {
|
|
c1 = EVUTIL_TOLOWER_(*s1++);
|
|
c2 = EVUTIL_TOLOWER_(*s2++);
|
|
if (c1 < c2)
|
|
return -1;
|
|
else if (c1 > c2)
|
|
return 1;
|
|
else if (c1 == 0)
|
|
return 0;
|
|
}
|
|
}
|
|
int evutil_ascii_strncasecmp(const char *s1, const char *s2, size_t n)
|
|
{
|
|
char c1, c2;
|
|
while (n--) {
|
|
c1 = EVUTIL_TOLOWER_(*s1++);
|
|
c2 = EVUTIL_TOLOWER_(*s2++);
|
|
if (c1 < c2)
|
|
return -1;
|
|
else if (c1 > c2)
|
|
return 1;
|
|
else if (c1 == 0)
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
evutil_rtrim_lws_(char *str)
|
|
{
|
|
char *cp;
|
|
|
|
if (str == NULL)
|
|
return;
|
|
|
|
if ((cp = strchr(str, '\0')) == NULL || (cp == str))
|
|
return;
|
|
|
|
--cp;
|
|
|
|
while (*cp == ' ' || *cp == '\t') {
|
|
*cp = '\0';
|
|
if (cp == str)
|
|
break;
|
|
--cp;
|
|
}
|
|
}
|
|
|
|
static int
|
|
evutil_issetugid(void)
|
|
{
|
|
#ifdef EVENT__HAVE_ISSETUGID
|
|
return issetugid();
|
|
#else
|
|
|
|
#ifdef EVENT__HAVE_GETEUID
|
|
if (getuid() != geteuid())
|
|
return 1;
|
|
#endif
|
|
#ifdef EVENT__HAVE_GETEGID
|
|
if (getgid() != getegid())
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
const char *
|
|
evutil_getenv_(const char *varname)
|
|
{
|
|
if (evutil_issetugid())
|
|
return NULL;
|
|
|
|
return getenv(varname);
|
|
}
|
|
|
|
ev_uint32_t
|
|
evutil_weakrand_seed_(struct evutil_weakrand_state *state, ev_uint32_t seed)
|
|
{
|
|
if (seed == 0) {
|
|
struct timeval tv;
|
|
evutil_gettimeofday(&tv, NULL);
|
|
seed = (ev_uint32_t)tv.tv_sec + (ev_uint32_t)tv.tv_usec;
|
|
#ifdef _WIN32
|
|
seed += (ev_uint32_t) _getpid();
|
|
#else
|
|
seed += (ev_uint32_t) getpid();
|
|
#endif
|
|
}
|
|
state->seed = seed;
|
|
return seed;
|
|
}
|
|
|
|
ev_int32_t
|
|
evutil_weakrand_(struct evutil_weakrand_state *state)
|
|
{
|
|
/* This RNG implementation is a linear congruential generator, with
|
|
* modulus 2^31, multiplier 1103515245, and addend 12345. It's also
|
|
* used by OpenBSD, and by Glibc's TYPE_0 RNG.
|
|
*
|
|
* The linear congruential generator is not an industrial-strength
|
|
* RNG! It's fast, but it can have higher-order patterns. Notably,
|
|
* the low bits tend to have periodicity.
|
|
*/
|
|
state->seed = ((state->seed) * 1103515245 + 12345) & 0x7fffffff;
|
|
return (ev_int32_t)(state->seed);
|
|
}
|
|
|
|
ev_int32_t
|
|
evutil_weakrand_range_(struct evutil_weakrand_state *state, ev_int32_t top)
|
|
{
|
|
ev_int32_t divisor, result;
|
|
|
|
/* We can't just do weakrand() % top, since the low bits of the LCG
|
|
* are less random than the high ones. (Specifically, since the LCG
|
|
* modulus is 2^N, every 2^m for m<N will divide the modulus, and so
|
|
* therefore the low m bits of the LCG will have period 2^m.) */
|
|
divisor = EVUTIL_WEAKRAND_MAX / top;
|
|
do {
|
|
result = evutil_weakrand_(state) / divisor;
|
|
} while (result >= top);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Volatile pointer to memset: we use this to keep the compiler from
|
|
* eliminating our call to memset.
|
|
*/
|
|
void * (*volatile evutil_memset_volatile_)(void *, int, size_t) = memset;
|
|
|
|
void
|
|
evutil_memclear_(void *mem, size_t len)
|
|
{
|
|
evutil_memset_volatile_(mem, 0, len);
|
|
}
|
|
|
|
int
|
|
evutil_sockaddr_is_loopback_(const struct sockaddr *addr)
|
|
{
|
|
static const char LOOPBACK_S6[16] =
|
|
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1";
|
|
if (addr->sa_family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
|
|
return (ntohl(sin->sin_addr.s_addr) & 0xff000000) == 0x7f000000;
|
|
} else if (addr->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
|
|
return !memcmp(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evutil_hex_char_to_int_(char c)
|
|
{
|
|
switch(c)
|
|
{
|
|
case '0': return 0;
|
|
case '1': return 1;
|
|
case '2': return 2;
|
|
case '3': return 3;
|
|
case '4': return 4;
|
|
case '5': return 5;
|
|
case '6': return 6;
|
|
case '7': return 7;
|
|
case '8': return 8;
|
|
case '9': return 9;
|
|
case 'A': case 'a': return 10;
|
|
case 'B': case 'b': return 11;
|
|
case 'C': case 'c': return 12;
|
|
case 'D': case 'd': return 13;
|
|
case 'E': case 'e': return 14;
|
|
case 'F': case 'f': return 15;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
HMODULE
|
|
evutil_load_windows_system_library_(const TCHAR *library_name)
|
|
{
|
|
TCHAR path[MAX_PATH];
|
|
unsigned n;
|
|
n = GetSystemDirectory(path, MAX_PATH);
|
|
if (n == 0 || n + _tcslen(library_name) + 2 >= MAX_PATH)
|
|
return 0;
|
|
_tcscat(path, TEXT("\\"));
|
|
_tcscat(path, library_name);
|
|
return LoadLibrary(path);
|
|
}
|
|
#endif
|
|
|
|
/* Internal wrapper around 'socket' to provide Linux-style support for
|
|
* syscall-saving methods where available.
|
|
*
|
|
* In addition to regular socket behavior, you can use a bitwise or to set the
|
|
* flags EVUTIL_SOCK_NONBLOCK and EVUTIL_SOCK_CLOEXEC in the 'type' argument,
|
|
* to make the socket nonblocking or close-on-exec with as few syscalls as
|
|
* possible.
|
|
*/
|
|
evutil_socket_t
|
|
evutil_socket_(int domain, int type, int protocol)
|
|
{
|
|
evutil_socket_t r;
|
|
#if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC)
|
|
r = socket(domain, type, protocol);
|
|
if (r >= 0)
|
|
return r;
|
|
else if ((type & (SOCK_NONBLOCK|SOCK_CLOEXEC)) == 0)
|
|
return -1;
|
|
#endif
|
|
#define SOCKET_TYPE_MASK (~(EVUTIL_SOCK_NONBLOCK|EVUTIL_SOCK_CLOEXEC))
|
|
r = socket(domain, type & SOCKET_TYPE_MASK, protocol);
|
|
if (r < 0)
|
|
return -1;
|
|
if (type & EVUTIL_SOCK_NONBLOCK) {
|
|
if (evutil_fast_socket_nonblocking(r) < 0) {
|
|
evutil_closesocket(r);
|
|
return -1;
|
|
}
|
|
}
|
|
if (type & EVUTIL_SOCK_CLOEXEC) {
|
|
if (evutil_fast_socket_closeonexec(r) < 0) {
|
|
evutil_closesocket(r);
|
|
return -1;
|
|
}
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/* Internal wrapper around 'accept' or 'accept4' to provide Linux-style
|
|
* support for syscall-saving methods where available.
|
|
*
|
|
* In addition to regular accept behavior, you can set one or more of flags
|
|
* EVUTIL_SOCK_NONBLOCK and EVUTIL_SOCK_CLOEXEC in the 'flags' argument, to
|
|
* make the socket nonblocking or close-on-exec with as few syscalls as
|
|
* possible.
|
|
*/
|
|
evutil_socket_t
|
|
evutil_accept4_(evutil_socket_t sockfd, struct sockaddr *addr,
|
|
ev_socklen_t *addrlen, int flags)
|
|
{
|
|
evutil_socket_t result;
|
|
#if defined(EVENT__HAVE_ACCEPT4) && defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
|
|
result = accept4(sockfd, addr, addrlen, flags);
|
|
if (result >= 0 || (errno != EINVAL && errno != ENOSYS)) {
|
|
/* A nonnegative result means that we succeeded, so return.
|
|
* Failing with EINVAL means that an option wasn't supported,
|
|
* and failing with ENOSYS means that the syscall wasn't
|
|
* there: in those cases we want to fall back. Otherwise, we
|
|
* got a real error, and we should return. */
|
|
return result;
|
|
}
|
|
#endif
|
|
result = accept(sockfd, addr, addrlen);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
if (flags & EVUTIL_SOCK_CLOEXEC) {
|
|
if (evutil_fast_socket_closeonexec(result) < 0) {
|
|
evutil_closesocket(result);
|
|
return -1;
|
|
}
|
|
}
|
|
if (flags & EVUTIL_SOCK_NONBLOCK) {
|
|
if (evutil_fast_socket_nonblocking(result) < 0) {
|
|
evutil_closesocket(result);
|
|
return -1;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* Internal function: Set fd[0] and fd[1] to a pair of fds such that writes on
|
|
* fd[1] get read from fd[0]. Make both fds nonblocking and close-on-exec.
|
|
* Return 0 on success, -1 on failure.
|
|
*/
|
|
int
|
|
evutil_make_internal_pipe_(evutil_socket_t fd[2])
|
|
{
|
|
/*
|
|
Making the second socket nonblocking is a bit subtle, given that we
|
|
ignore any EAGAIN returns when writing to it, and you don't usally
|
|
do that for a nonblocking socket. But if the kernel gives us EAGAIN,
|
|
then there's no need to add any more data to the buffer, since
|
|
the main thread is already either about to wake up and drain it,
|
|
or woken up and in the process of draining it.
|
|
*/
|
|
|
|
#if defined(EVENT__HAVE_PIPE2)
|
|
if (pipe2(fd, O_NONBLOCK|O_CLOEXEC) == 0)
|
|
return 0;
|
|
#endif
|
|
#if defined(EVENT__HAVE_PIPE)
|
|
if (pipe(fd) == 0) {
|
|
if (evutil_fast_socket_nonblocking(fd[0]) < 0 ||
|
|
evutil_fast_socket_nonblocking(fd[1]) < 0 ||
|
|
evutil_fast_socket_closeonexec(fd[0]) < 0 ||
|
|
evutil_fast_socket_closeonexec(fd[1]) < 0) {
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
fd[0] = fd[1] = -1;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
} else {
|
|
event_warn("%s: pipe", __func__);
|
|
}
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
#define LOCAL_SOCKETPAIR_AF AF_INET
|
|
#else
|
|
#define LOCAL_SOCKETPAIR_AF AF_UNIX
|
|
#endif
|
|
if (evutil_socketpair(LOCAL_SOCKETPAIR_AF, SOCK_STREAM, 0, fd) == 0) {
|
|
if (evutil_fast_socket_nonblocking(fd[0]) < 0 ||
|
|
evutil_fast_socket_nonblocking(fd[1]) < 0 ||
|
|
evutil_fast_socket_closeonexec(fd[0]) < 0 ||
|
|
evutil_fast_socket_closeonexec(fd[1]) < 0) {
|
|
evutil_closesocket(fd[0]);
|
|
evutil_closesocket(fd[1]);
|
|
fd[0] = fd[1] = -1;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
fd[0] = fd[1] = -1;
|
|
return -1;
|
|
}
|
|
|
|
/* Wrapper around eventfd on systems that provide it. Unlike the system
|
|
* eventfd, it always supports EVUTIL_EFD_CLOEXEC and EVUTIL_EFD_NONBLOCK as
|
|
* flags. Returns -1 on error or if eventfd is not supported.
|
|
*/
|
|
evutil_socket_t
|
|
evutil_eventfd_(unsigned initval, int flags)
|
|
{
|
|
#if defined(EVENT__HAVE_EVENTFD) && defined(EVENT__HAVE_SYS_EVENTFD_H)
|
|
int r;
|
|
#if defined(EFD_CLOEXEC) && defined(EFD_NONBLOCK)
|
|
r = eventfd(initval, flags);
|
|
if (r >= 0 || flags == 0)
|
|
return r;
|
|
#endif
|
|
r = eventfd(initval, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (flags & EVUTIL_EFD_CLOEXEC) {
|
|
if (evutil_fast_socket_closeonexec(r) < 0) {
|
|
evutil_closesocket(r);
|
|
return -1;
|
|
}
|
|
}
|
|
if (flags & EVUTIL_EFD_NONBLOCK) {
|
|
if (evutil_fast_socket_nonblocking(r) < 0) {
|
|
evutil_closesocket(r);
|
|
return -1;
|
|
}
|
|
}
|
|
return r;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
evutil_free_globals_(void)
|
|
{
|
|
evutil_free_secure_rng_globals_();
|
|
evutil_free_sock_err_globals();
|
|
}
|