Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/evutil.c b/evutil.c
new file mode 100644
index 0000000..3344517
--- /dev/null
+++ b/evutil.c
@@ -0,0 +1,2190 @@
+/*
+ * 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.
+ */
+
+#include "event2/event-config.h"
+
+#define _GNU_SOURCE
+
+#ifdef WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#include <io.h>
+#include <tchar.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_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#ifndef _EVENT_HAVE_GETTIMEOFDAY
+#include <sys/timeb.h>
+#include <time.h>
+#endif
+#include <sys/stat.h>
+
+#include "event2/util.h"
+#include "util-internal.h"
+#include "log-internal.h"
+#include "mm-internal.h"
+
+#include "strlcpy-internal.h"
+#include "ipv6-internal.h"
+
+#ifdef WIN32
+#define open _open
+#define read _read
+#define close _close
+#define fstat _fstati64
+#define stat _stati64
+#define mode_t int
+#endif
+
+int
+evutil_open_closeonexec(const char *pathname, int flags, unsigned mode)
+{
+ int fd;
+
+#ifdef O_CLOEXEC
+ flags |= O_CLOEXEC;
+#endif
+
+ if (flags & O_CREAT)
+ fd = open(pathname, flags, (mode_t)mode);
+ else
+ fd = open(pathname, flags);
+ if (fd < 0)
+ return -1;
+
+#if !defined(O_CLOEXEC) && defined(FD_CLOEXEC)
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
+ return -1;
+#endif
+
+ return fd;
+}
+
+/**
+ 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, r;
+ struct stat st;
+ 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;
+ if (fstat(fd, &st) || st.st_size < 0 ||
+ st.st_size > EV_SSIZE_MAX-1 ) {
+ close(fd);
+ return -2;
+ }
+ mem = mm_malloc((size_t)st.st_size + 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(st.st_size - read_so_far))) > 0) {
+ read_so_far += r;
+ if (read_so_far >= (size_t)st.st_size)
+ break;
+ EVUTIL_ASSERT(read_so_far < (size_t)st.st_size);
+ }
+ 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;
+}
+
+int
+evutil_socketpair(int family, int type, int protocol, evutil_socket_t fd[2])
+{
+#ifndef WIN32
+ return socketpair(family, type, protocol, fd);
+#else
+ return evutil_ersatz_socketpair(family, type, protocol, fd);
+#endif
+}
+
+int
+evutil_ersatz_socketpair(int family, int type, int protocol,
+ evutil_socket_t fd[2])
+{
+ /* This code is originally from Tor. Used with permission. */
+
+ /* This socketpair does not work when localhost is down. So
+ * it's really not the same thing at all. But it's close enough
+ * for now, and really, when localhost is down sometimes, we
+ * have other problems too.
+ */
+#ifdef WIN32
+#define ERR(e) WSA##e
+#else
+#define ERR(e) e
+#endif
+ evutil_socket_t listener = -1;
+ evutil_socket_t connector = -1;
+ evutil_socket_t acceptor = -1;
+ struct sockaddr_in listen_addr;
+ struct sockaddr_in connect_addr;
+ ev_socklen_t size;
+ int saved_errno = -1;
+
+ if (protocol
+ || (family != AF_INET
+#ifdef AF_UNIX
+ && family != AF_UNIX
+#endif
+ )) {
+ EVUTIL_SET_SOCKET_ERROR(ERR(EAFNOSUPPORT));
+ return -1;
+ }
+ if (!fd) {
+ EVUTIL_SET_SOCKET_ERROR(ERR(EINVAL));
+ return -1;
+ }
+
+ listener = socket(AF_INET, type, 0);
+ if (listener < 0)
+ return -1;
+ memset(&listen_addr, 0, sizeof(listen_addr));
+ listen_addr.sin_family = AF_INET;
+ listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ listen_addr.sin_port = 0; /* kernel chooses port. */
+ if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
+ == -1)
+ goto tidy_up_and_fail;
+ if (listen(listener, 1) == -1)
+ goto tidy_up_and_fail;
+
+ connector = socket(AF_INET, type, 0);
+ if (connector < 0)
+ goto tidy_up_and_fail;
+ /* We want to find out the port number to connect to. */
+ size = sizeof(connect_addr);
+ if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
+ goto tidy_up_and_fail;
+ if (size != sizeof (connect_addr))
+ goto abort_tidy_up_and_fail;
+ if (connect(connector, (struct sockaddr *) &connect_addr,
+ sizeof(connect_addr)) == -1)
+ goto tidy_up_and_fail;
+
+ size = sizeof(listen_addr);
+ acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
+ if (acceptor < 0)
+ goto tidy_up_and_fail;
+ if (size != sizeof(listen_addr))
+ goto abort_tidy_up_and_fail;
+ /* Now check we are talking to ourself by matching port and host on the
+ two sockets. */
+ if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
+ goto tidy_up_and_fail;
+ if (size != sizeof (connect_addr)
+ || listen_addr.sin_family != connect_addr.sin_family
+ || listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr
+ || listen_addr.sin_port != connect_addr.sin_port)
+ goto abort_tidy_up_and_fail;
+ 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);
+
+ EVUTIL_SET_SOCKET_ERROR(saved_errno);
+ return -1;
+#undef ERR
+}
+
+int
+evutil_make_socket_nonblocking(evutil_socket_t fd)
+{
+#ifdef WIN32
+ {
+ u_long nonblocking = 1;
+ if (ioctlsocket(fd, FIONBIO, &nonblocking) == SOCKET_ERROR) {
+ event_sock_warn(fd, "fcntl(%d, F_GETFL)", (int)fd);
+ return -1;
+ }
+ }
+#else
+ {
+ int flags;
+ if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) {
+ event_warn("fcntl(%d, F_GETFL)", fd);
+ return -1;
+ }
+ if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
+ event_warn("fcntl(%d, F_SETFL)", fd);
+ return -1;
+ }
+ }
+#endif
+ return 0;
+}
+
+int
+evutil_make_listen_socket_reuseable(evutil_socket_t sock)
+{
+#ifndef 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_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 (fcntl(fd, F_SETFD, flags | 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
+}
+
+#ifndef _EVENT_HAVE_GETTIMEOFDAY
+/* No gettimeofday; this muse be windows. */
+int
+evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+ struct _timeb tb;
+
+ if (tv == NULL)
+ return -1;
+
+ /* XXXX
+ * _ftime is not the greatest interface here; GetSystemTimeAsFileTime
+ * would give us better resolution, whereas something cobbled together
+ * with GetTickCount could maybe give us monotonic behavior.
+ *
+ * Either way, I think this value might be skewed to ignore the
+ * timezone, and just return local time. That's not so good.
+ */
+ _ftime(&tb);
+ tv->tv_sec = (long) tb.time;
+ tv->tv_usec = ((int) tb.millitm) * 1000;
+ return 0;
+}
+#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, 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;
+
+/* Macro: True iff the IPv4 address 'addr', in host order, is in 127.0.0.0/8
+ */
+#define EVUTIL_V4ADDR_IS_LOCALHOST(addr) (((addr)>>24) == 127)
+
+/* Macro: True iff the IPv4 address 'addr', in host order, is a class D
+ * (multiclass) address.
+ */
+#define EVUTIL_V4ADDR_IS_CLASSD(addr) ((((addr)>>24) & 0xf0) == 0xe0)
+
+/* Test whether we have an ipv4 interface and an ipv6 interface. Return 0 if
+ * the test seemed successful. */
+static int
+evutil_check_interfaces(int force_recheck)
+{
+ const char ZEROES[] = "\x00\x00\x00\x00\x00\x00\x00\x00"
+ "\x00\x00\x00\x00\x00\x00\x00\x00";
+ 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;
+ char buf[128];
+ if (have_checked_interfaces && !force_recheck)
+ return 0;
+
+ /* To check whether we have an interface open for a given protocol, we
+ * 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. */
+ ev_uint32_t addr = ntohl(sin_out.sin_addr.s_addr);
+ if (addr == 0 ||
+ EVUTIL_V4ADDR_IS_LOCALHOST(addr) ||
+ EVUTIL_V4ADDR_IS_CLASSD(addr)) {
+ evutil_inet_ntop(AF_INET, &sin_out.sin_addr,
+ buf, sizeof(buf));
+ /* This is a reserved, ipv4compat, ipv4map, loopback,
+ * link-local or unspecified address. The host should
+ * never have given it to us; it could never connect
+ * to sin. */
+ event_warnx("Got a strange local ipv4 address %s",buf);
+ } else {
+ event_debug(("Detected an IPv4 interface"));
+ had_ipv4_address = 1;
+ }
+ }
+ 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. */
+ const unsigned char *addr =
+ (unsigned char*)sin6_out.sin6_addr.s6_addr;
+ if (!memcmp(addr, ZEROES, 8) ||
+ (addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80)) {
+ /* This is a reserved, ipv4compat, ipv4map, loopback,
+ * link-local or unspecified address. The host should
+ * never have given it to us; it could never connect
+ * to sin6. */
+ evutil_inet_ntop(AF_INET6, &sin6_out.sin6_addr,
+ buf, sizeof(buf));
+ event_warnx("Got a strange local ipv6 address %s",buf);
+ } else {
+ event_debug(("Detected an IPv4 interface"));
+ had_ipv6_address = 1;
+ }
+ }
+
+ 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;
+ 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(AF_INET6, nodename, &sin6.sin6_addr)) {
+ /* Got an ipv6 address. */
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_port = htons(port);
+ *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 ipv6 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_in);
+ 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;
+ if (!have_checked_interfaces)
+ evutil_check_interfaces(0);
+ 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 void
+test_for_getaddrinfo_hacks(void)
+{
+ int r, r2;
+ struct evutil_addrinfo *ai=NULL, *ai2=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);
+ 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 (ai2 && ai2->ai_protocol == 0) {
+ need_socktype_protocol_hack_=1;
+ }
+
+ if (ai)
+ freeaddrinfo(ai);
+ if (ai2)
+ freeaddrinfo(ai2);
+ 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;
+
+void
+evutil_set_evdns_getaddrinfo_fn(evdns_getaddrinfo_fn fn)
+{
+ if (!evdns_getaddrinfo_impl)
+ evdns_getaddrinfo_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.
+ */
+int
+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) {
+ 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 0;
+}
+
+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
+#define E(code, s) { code, (s " [" #code " ]") }
+static struct { int code; const char *msg; } windows_socket_errors[] = {
+ E(WSAEINTR, "Interrupted function call"),
+ E(WSAEACCES, "Permission denied"),
+ E(WSAEFAULT, "Bad address"),
+ E(WSAEINVAL, "Invalid argument"),
+ E(WSAEMFILE, "Too many open files"),
+ E(WSAEWOULDBLOCK, "Resource temporarily unavailable"),
+ E(WSAEINPROGRESS, "Operation now in progress"),
+ E(WSAEALREADY, "Operation already in progress"),
+ E(WSAENOTSOCK, "Socket operation on nonsocket"),
+ E(WSAEDESTADDRREQ, "Destination address required"),
+ E(WSAEMSGSIZE, "Message too long"),
+ E(WSAEPROTOTYPE, "Protocol wrong for socket"),
+ E(WSAENOPROTOOPT, "Bad protocol option"),
+ E(WSAEPROTONOSUPPORT, "Protocol not supported"),
+ E(WSAESOCKTNOSUPPORT, "Socket type not supported"),
+ /* What's the difference between NOTSUPP and NOSUPPORT? :) */
+ E(WSAEOPNOTSUPP, "Operation not supported"),
+ E(WSAEPFNOSUPPORT, "Protocol family not supported"),
+ E(WSAEAFNOSUPPORT, "Address family not supported by protocol family"),
+ E(WSAEADDRINUSE, "Address already in use"),
+ E(WSAEADDRNOTAVAIL, "Cannot assign requested address"),
+ E(WSAENETDOWN, "Network is down"),
+ E(WSAENETUNREACH, "Network is unreachable"),
+ E(WSAENETRESET, "Network dropped connection on reset"),
+ E(WSAECONNABORTED, "Software caused connection abort"),
+ E(WSAECONNRESET, "Connection reset by peer"),
+ E(WSAENOBUFS, "No buffer space available"),
+ E(WSAEISCONN, "Socket is already connected"),
+ E(WSAENOTCONN, "Socket is not connected"),
+ E(WSAESHUTDOWN, "Cannot send after socket shutdown"),
+ E(WSAETIMEDOUT, "Connection timed out"),
+ E(WSAECONNREFUSED, "Connection refused"),
+ E(WSAEHOSTDOWN, "Host is down"),
+ E(WSAEHOSTUNREACH, "No route to host"),
+ E(WSAEPROCLIM, "Too many processes"),
+
+ /* Yes, some of these start with WSA, not WSAE. No, I don't know why. */
+ E(WSASYSNOTREADY, "Network subsystem is unavailable"),
+ E(WSAVERNOTSUPPORTED, "Winsock.dll out of range"),
+ E(WSANOTINITIALISED, "Successful WSAStartup not yet performed"),
+ E(WSAEDISCON, "Graceful shutdown now in progress"),
+#ifdef WSATYPE_NOT_FOUND
+ E(WSATYPE_NOT_FOUND, "Class type not found"),
+#endif
+ E(WSAHOST_NOT_FOUND, "Host not found"),
+ E(WSATRY_AGAIN, "Nonauthoritative host not found"),
+ E(WSANO_RECOVERY, "This is a nonrecoverable error"),
+ E(WSANO_DATA, "Valid name, no data record of requested type)"),
+
+ /* There are some more error codes whose numeric values are marked
+ * <b>OS dependent</b>. They start with WSA_, apparently for the same
+ * reason that practitioners of some craft traditions deliberately
+ * introduce imperfections into their baskets and rugs "to allow the
+ * evil spirits to escape." If we catch them, then our binaries
+ * might not report consistent results across versions of Windows.
+ * Thus, I'm going to let them all fall through.
+ */
+ { -1, NULL },
+};
+#undef E
+/** Equivalent to strerror, but for windows socket errors. */
+const char *
+evutil_socket_error_to_string(int errcode)
+{
+ /* XXXX Is there really no built-in function to do this? */
+ int i;
+ for (i=0; windows_socket_errors[i].code >= 0; ++i) {
+ if (errcode == windows_socket_errors[i].code)
+ return windows_socket_errors[i].msg;
+ }
+ return strerror(errcode);
+}
+#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(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) {
+ int a,b,c,d;
+ char more;
+ struct in_addr *addr = dst;
+ if (sscanf(src, "%d.%d.%d.%d%c", &a,&b,&c,&d,&more) != 4)
+ return 0;
+ if (a < 0 || a > 255) return 0;
+ if (b < 0 || b > 255) return 0;
+ if (c < 0 || c > 255) return 0;
+ if (d < 0 || 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 {
+ int 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, "%d.%d.%d.%d%c",
+ &byte1,&byte2,&byte3,&byte4,&more) != 4)
+ return 0;
+
+ if (byte1 > 255 || byte1 < 0 ||
+ byte2 > 255 || byte2 < 0 ||
+ byte3 > 255 || byte3 < 0 ||
+ byte4 > 255 || byte4 < 0)
+ 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;
+ 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 == '[') {
+ int len;
+ if (!(cp = strchr(ip_as_string, ']'))) {
+ return -1;
+ }
+ len = (int) ( cp-(ip_as_string + 1) );
+ if (len > (int)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(AF_INET6, addr_part, &sin6.sin6_addr))
+ return -1;
+ if ((int)sizeof(sin6) > *outlen)
+ return -1;
+ 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] & (1 << (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;
+}
+
+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);
+}
+
+long
+_evutil_weakrand(void)
+{
+#ifdef WIN32
+ return rand();
+#else
+ return random();
+#endif
+}
+
+/**
+ * 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;
+}
+
+#define MAX_SECONDS_IN_MSEC_LONG \
+ (((LONG_MAX) - 999) / 1000)
+
+long
+evutil_tv_to_msec(const struct timeval *tv)
+{
+ if (tv->tv_usec > 1000000 || tv->tv_sec > MAX_SECONDS_IN_MSEC_LONG)
+ return -1;
+
+ return (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
+}
+
+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
+HANDLE
+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
+