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evutil.c
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/*
* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef _WIN32
#ifndef _WIN32_WINNT
/* For structs needed by GetAdaptersAddresses and AI_NUMERICSERV */
#define _WIN32_WINNT 0x0600
#endif
#define WIN32_LEAN_AND_MEAN
#endif
#include "event2/event-config.h"
#include "evconfig-private.h"
#ifdef _WIN32
#include <winsock2.h>
#include <winerror.h>
#include <ws2tcpip.h>
#ifdef _MSC_VER /* mstcpip.h is missing on MinGW */
#include <mstcpip.h> /* for SIO_KEEPALIVE_VALS and tcp_keepalive struct */
#endif
#ifdef EVENT__HAVE_AFUNIX_H
#include <afunix.h>
#endif
#include <windows.h>
#include <io.h>
#include <tchar.h>
#include <process.h>
#include <iphlpapi.h>
#include <netioapi.h>
#endif
#ifdef EVENT__HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/types.h>
#ifdef EVENT__HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef EVENT__HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef EVENT__HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef EVENT__HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#ifdef EVENT__HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef EVENT__HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef EVENT__HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#ifdef EVENT__HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <time.h>
#include <sys/stat.h>
#ifndef _WIN32
#include <net/if.h>
#endif
#ifdef EVENT__HAVE_IFADDRS_H
#include <ifaddrs.h>
#endif
#include "event2/util.h"
#include "util-internal.h"
#include "log-internal.h"
#include "mm-internal.h"
#include "evthread-internal.h"
#include "strlcpy-internal.h"
#include "ipv6-internal.h"
#ifdef _WIN32
#define HT_NO_CACHE_HASH_VALUES
#include "ht-internal.h"
#define open _open
#define read _read
#define close _close
#ifndef fstat
// i64 suffix is for 64-bit filesize support
#define fstat _fstati64
#endif
#ifndef stat
#define stat _stati64
#endif
#define mode_t int
#endif
#if defined(_WIN32) && !defined(SIO_KEEPALIVE_VALS)
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)
struct tcp_keepalive {
u_long onoff;
u_long keepalivetime;
u_long keepaliveinterval;
};
#endif
#ifndef O_RDONLY
#define O_RDONLY _O_RDONLY
#endif
#ifdef EVENT__HAVE_AFUNIX_H
int have_working_afunix_ = -1;
#endif
int
evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode)
{
int fd;
#ifdef O_CLOEXEC
fd = open(pathname, flags|O_CLOEXEC, (mode_t)mode);
if (fd >= 0 || errno == EINVAL)
return fd;
/* If we got an EINVAL, fall through and try without O_CLOEXEC */
#endif
fd = open(pathname, flags, (mode_t)mode);
if (fd < 0)
return -1;
#if defined(FD_CLOEXEC)
if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
close(fd);
return -1;
}
#endif
return fd;
}
ev_off_t evutil_fd_filesize(evutil_socket_t fd)
{
struct stat st;
if (fstat(fd, &st) < 0)
return -1;
return st.st_size;
}
/**
Read the contents of 'filename' into a newly allocated NUL-terminated
string. Set *content_out to hold this string, and *len_out to hold its
length (not including the appended NUL). If 'is_binary', open the file in
binary mode.
Returns 0 on success, -1 if the open fails, and -2 for all other failures.
Used internally only; may go away in a future version.
*/
int
evutil_read_file_(const char *filename, char **content_out, size_t *len_out,
int is_binary)
{
int fd;
ev_ssize_t r;
ev_off_t length;
char *mem;
size_t read_so_far = 0;
int mode = O_RDONLY;
EVUTIL_ASSERT(content_out);
EVUTIL_ASSERT(len_out);
*content_out = NULL;
*len_out = 0;
#ifdef O_BINARY
if (is_binary)
mode |= O_BINARY;
#endif
fd = evutil_open_closeonexec_(filename, mode, 0);
if (fd < 0)
return -1;
length = evutil_fd_filesize(fd);
if (length < 0 || length > EV_SSIZE_MAX-1) {
close(fd);
return -2;
}
mem = mm_malloc(length + 1);
if (!mem) {
close(fd);
return -2;
}
read_so_far = 0;
#ifdef _WIN32
#define N_TO_READ(x) ((x) > INT_MAX) ? INT_MAX : ((int)(x))
#else
#define N_TO_READ(x) (x)
#endif
while ((r = read(fd, mem+read_so_far, N_TO_READ(length - read_so_far))) > 0) {
read_so_far += r;
if (read_so_far >= (size_t)length)
break;
}
close(fd);
if (r < 0) {
mm_free(mem);
return -2;
}
mem[read_so_far] = 0;
*len_out = read_so_far;
*content_out = mem;
return 0;
}
#ifdef _WIN32
static int
create_tmpfile(WCHAR tmpfile[MAX_PATH])
{
WCHAR short_path[MAX_PATH] = {0};
WCHAR long_path[MAX_PATH] = {0};
WCHAR prefix[4] = {0};
// GetTempFileNameW() uses up to the first three characters of the prefix
// and windows filesystems are case-insensitive
const WCHAR *base32set = L"abcdefghijklmnopqrstuvwxyz012345";
ev_uint16_t rnd;
evutil_secure_rng_get_bytes(&rnd, sizeof(rnd));
prefix[0] = base32set[(rnd ) & 31];
prefix[1] = base32set[(rnd >> 5) & 31];
prefix[2] = base32set[(rnd >> 10) & 31];
prefix[3] = '\0';
GetTempPathW(MAX_PATH, short_path);
GetLongPathNameW(short_path, long_path, MAX_PATH);
if (!GetTempFileNameW(long_path, prefix, 0, tmpfile)) {
event_warnx("GetTempFileName failed: %d", EVUTIL_SOCKET_ERROR());
return -1;
}
return 0;
}
#ifdef EVENT__HAVE_AFUNIX_H
/* Test whether Unix domain socket works.
* Return 1 if it works, otherwise 0 */
int
evutil_check_working_afunix_()
{
/* Windows 10 began to support Unix domain socket. Let's just try
* socket(AF_UNIX, , ) and fall back to socket(AF_INET, , ).
* https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/
*/
evutil_socket_t sd = -1;
if (have_working_afunix_ < 0) {
if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
have_working_afunix_ = 0;
} else {
have_working_afunix_ = 1;
evutil_closesocket(sd);
}
}
return have_working_afunix_;
}
/* XXX Copy from evutil_ersatz_socketpair_() */
static int
evutil_win_socketpair_afunix(int family, int type, int protocol,
evutil_socket_t fd[2])
{
#undef ERR
#define ERR(e) WSA##e
evutil_socket_t listener = -1;
evutil_socket_t connector = -1;
evutil_socket_t acceptor = -1;
struct sockaddr_un listen_addr;
struct sockaddr_un connect_addr;
WCHAR tmp_file[MAX_PATH] = {0};
char tmp_file_utf8[MAX_PATH] = {0};
ev_socklen_t size;
int saved_errno = -1;
if (!fd) {
EVUTIL_SET_SOCKET_ERROR(ERR(EINVAL));
return -1;
}
listener = socket(family, type, 0);
if (listener < 0)
return -1;
memset(&listen_addr, 0, sizeof(listen_addr));
if (create_tmpfile(tmp_file)) {
goto tidy_up_and_fail;
}
DeleteFileW(tmp_file);
/* Windows requires `sun_path` to be encoded by UTF-8 */
WideCharToMultiByte(
CP_UTF8, 0, tmp_file, MAX_PATH, tmp_file_utf8, MAX_PATH, NULL, NULL);
listen_addr.sun_family = AF_UNIX;
if (strlcpy(listen_addr.sun_path, tmp_file_utf8, UNIX_PATH_MAX) >=
UNIX_PATH_MAX) {
event_warnx("Temp file name is too long");
goto tidy_up_and_fail;
}
if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
== -1)
goto tidy_up_and_fail;
if (listen(listener, 1) == -1)
goto tidy_up_and_fail;
connector = socket(family, type, 0);
if (connector < 0)
goto tidy_up_and_fail;
memset(&connect_addr, 0, sizeof(connect_addr));
/* We want to find out the port number to connect to. */
size = sizeof(connect_addr);
if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
goto tidy_up_and_fail;
if (connect(connector, (struct sockaddr *) &connect_addr,
sizeof(connect_addr)) == -1)
goto tidy_up_and_fail;
size = sizeof(listen_addr);
acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
if (acceptor < 0)
goto tidy_up_and_fail;
if (size != sizeof(listen_addr))
goto abort_tidy_up_and_fail;
/* Now check we are talking to ourself by matching port and host on the
two sockets. */
if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
goto tidy_up_and_fail;
if (size != sizeof(connect_addr) ||
listen_addr.sun_family != connect_addr.sun_family ||
evutil_ascii_strcasecmp(listen_addr.sun_path, connect_addr.sun_path))
goto abort_tidy_up_and_fail;
evutil_closesocket(listener);
fd[0] = connector;
fd[1] = acceptor;
return 0;
abort_tidy_up_and_fail:
saved_errno = ERR(ECONNABORTED);
tidy_up_and_fail:
if (saved_errno < 0)
saved_errno = EVUTIL_SOCKET_ERROR();
if (listener != -1)
evutil_closesocket(listener);
if (connector != -1)
evutil_closesocket(connector);
if (acceptor != -1)
evutil_closesocket(acceptor);
if (tmp_file[0])
DeleteFileW(tmp_file);
EVUTIL_SET_SOCKET_ERROR(saved_errno);
return -1;
#undef ERR
}
#endif
static int
evutil_win_socketpair(int family, int type, int protocol,
evutil_socket_t fd[2])
{
#ifdef EVENT__HAVE_AFUNIX_H
/* The family only support AF_UNIX and AF_INET */
if (protocol || (family != AF_UNIX && family != AF_INET)) {
EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
return -1;
}
if (evutil_check_working_afunix_()) {
/* If the AF_UNIX socket works, we will change the family to
* AF_UNIX forcely. */
family = AF_UNIX;
if (type != SOCK_STREAM) {
/* Win10 does not support AF_UNIX socket of a type other
* than SOCK_STREAM still now. */
EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
return -1;
}
} else {
/* If the AF_UNIX socket does not work, we will change the
* family to AF_INET forcely. */
family = AF_INET;
}
if (family == AF_UNIX)
return evutil_win_socketpair_afunix(family, type, protocol, fd);
#endif
return evutil_ersatz_socketpair_(family, type, protocol, fd);
}
#endif
int
evutil_make_socket_nonblocking(evutil_socket_t fd)
{
#ifdef _WIN32
{
unsigned long nonblocking = 1;
if (ioctlsocket(fd, FIONBIO, &nonblocking) == SOCKET_ERROR) {
event_sock_warn(fd, "ioctlsocket(%d, FIONBIO, &%lu)", (int)fd, (unsigned long)nonblocking);
return -1;
}
}
#else
{
int flags;
if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) {
event_warn("fcntl(%d, F_GETFL)", fd);
return -1;
}
if (!(flags & O_NONBLOCK)) {
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
event_warn("fcntl(%d, F_SETFL)", fd);
return -1;
}
}
}
#endif
return 0;
}
/* Faster version of evutil_make_socket_nonblocking for internal use.
*
* Requires that no F_SETFL flags were previously set on the fd.
*/
static int
evutil_fast_socket_nonblocking(evutil_socket_t fd)
{
#ifdef _WIN32
return evutil_make_socket_nonblocking(fd);
#else
if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
event_warn("fcntl(%d, F_SETFL)", fd);
return -1;
}
return 0;
#endif
}
int
evutil_make_listen_socket_reuseable(evutil_socket_t sock)
{
#if defined(SO_REUSEADDR) && !defined(_WIN32)
int one = 1;
/* REUSEADDR on Unix means, "don't hang on to this address after the
* listener is closed." On Windows, though, it means "don't keep other
* processes from binding to this address while we're using it. */
return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
(ev_socklen_t)sizeof(one));
#else
return 0;
#endif
}
int
evutil_make_listen_socket_reuseable_port(evutil_socket_t sock)
{
#if defined(__FreeBSD__) && __FreeBSD__ >= 12 && defined(SO_REUSEPORT_LB)
/* FreeBSD 12 introduced a new socket option named SO_REUSEPORT_LB
* with the capability of load balancing, it's the equivalent of
* the SO_REUSEPORTs on Linux and DragonFlyBSD. */
int enabled = 1;
return setsockopt(sock, SOL_SOCKET, SO_REUSEPORT_LB, (void*)&enabled,
(ev_socklen_t)sizeof(enabled));
#elif (defined(__linux__) || \
defined(_AIX73) || \
(defined(__DragonFly__) && __DragonFly_version >= 300600) || \
(defined(EVENT__SOLARIS_11_4) && EVENT__SOLARIS_11_4)) && \
defined(SO_REUSEPORT)
int enabled = 1;
/* SO_REUSEPORT on Linux 3.9+ means, "Multiple servers (processes or
* threads) can bind to the same port if they each set the option".
* In addition, the SO_REUSEPORT implementation distributes connections
* or datagrams evenly across all of the threads (or processes).
*
* DragonFlyBSD 3.6.0 extended SO_REUSEPORT to distribute workload to
* available sockets, which make it the same as Linux's SO_REUSEPORT.
*
* AIX 7.2.5 added the feature that would add the capability to distribute
* incoming connections across all listening ports for SO_REUSEPORT.
*
* Solaris 11 supported SO_REUSEPORT, but it's implemented only for
* binding to the same address and port, without load balancing.
* Solaris 11.4 extended SO_REUSEPORT with the capability of load balancing.
*/
return setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, (void*)&enabled,
(ev_socklen_t)sizeof(enabled));
#else
/* SO_REUSEPORTs on macOS and other BSDs only enable duplicate address and
* port bindings, load balancing is not included. Therefore, only the last
* socket that binds to a given address and port will receive all the traffic,
* which means that incoming connections/datagrams will be shifted from the
* old thread (or process) to the new one. That's not what we want, so we fail
* this operation on these systems to indicate that SO_REUSEPORT without load
* balancing is not supported. Otherwise, the callers would expected the load
* balancing capability when they get 0 as the return value of this function.
*/
return -1;
#endif
}
int
evutil_make_listen_socket_ipv6only(evutil_socket_t sock)
{
#if defined(IPV6_V6ONLY)
int one = 1;
return setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*) &one,
(ev_socklen_t)sizeof(one));
#endif
return 0;
}
int
evutil_make_listen_socket_not_ipv6only(evutil_socket_t sock)
{
#if defined(IPV6_V6ONLY)
int zero = 0;
return setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&zero,
(ev_socklen_t)sizeof(zero));
#endif
return 0;
}
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 */
return setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &one,
(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;