Commit message: evutil_parse_sockaddr_port(): fix buffer overflow

@asn-the-goblin-slayer:
  "Length between '[' and ']' is cast to signed 32 bit integer on line 1815. Is
   the length is more than 2<<31 (INT_MAX), len will hold a negative value.
   Consequently, it will pass the check at line 1816. Segfault happens at line
   1819.

   Generate a resolv.conf with generate-resolv.conf, then compile and run
   poc.c. See entry-functions.txt for functions in tor that might be
   vulnerable.

   Please credit 'Guido Vranken' for this discovery through the Tor bug bounty
   program."

Reproducer for gdb (https://gist.github.com/azat/be2b0d5e9417ba0dfe2c):
  start
  p (1ULL<<31)+1ULL
  # $1 = 2147483649
  p malloc(sizeof(struct sockaddr))
  # $2 = (void *) 0x646010
  p malloc(sizeof(int))
  # $3 = (void *) 0x646030
  p malloc($1)
  # $4 = (void *) 0x7fff76a2a010
  p memset($4, 1, $1)
  # $5 = 1990369296
  p (char *)$4
  # $6 = 0x7fff76a2a010 '\001' <repeats 200 times>...
  set $6[0]='['
  set $6[$1]=']'
  p evutil_parse_sockaddr_port($4, $2, $3)
  # $7 = -1

Before:
  $ gdb bin/http-connect < gdb
  (gdb) $1 = 2147483649
  (gdb) (gdb) $2 = (void *) 0x646010
  (gdb) (gdb) $3 = (void *) 0x646030
  (gdb) (gdb) $4 = (void *) 0x7fff76a2a010
  (gdb) (gdb) $5 = 1990369296
  (gdb) (gdb) $6 = 0x7fff76a2a010 '\001' <repeats 200 times>...
  (gdb) (gdb) (gdb) (gdb)
  Program received signal SIGSEGV, Segmentation fault.
  __memcpy_sse2_unaligned () at memcpy-sse2-unaligned.S:36

After:
  $ gdb bin/http-connect < gdb
  (gdb) $1 = 2147483649
  (gdb) (gdb) $2 = (void *) 0x646010
  (gdb) (gdb) $3 = (void *) 0x646030
  (gdb) (gdb) $4 = (void *) 0x7fff76a2a010
  (gdb) (gdb) $5 = 1990369296
  (gdb) (gdb) $6 = 0x7fff76a2a010 '\001' <repeats 200 times>...
  (gdb) (gdb) (gdb) (gdb) $7 = -1
  (gdb) (gdb) quit

Fixes: #318
CVE: CVE-2016-10196
CWE: CWE-119
Vulnerability description: Stack-based buffer overflow in the evutil_parse_sockaddr_port function in evutil.c in libevent before 2.1.6-beta allows attackers to cause a denial of service (segmentation fault) via vectors involving a long string in brackets in the ip_as_string argument.

Project: libevent
File: evutil.c

char EVUTIL_TOUPPER_(char c)
{
	return ((char)EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c]);
}

Project: libevent

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]);
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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);
		}
	}
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

eq_cached_sock_errs(const struct cached_sock_errs_entry *a,
		    const struct cached_sock_errs_entry *b)
{
	return a->code == b->code;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

evutil_closesocket(evutil_socket_t sock)
{
#ifndef _WIN32
	return close(sock);
#else
	return closesocket(sock);
#endif
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

evutil_found_ifaddr(const struct sockaddr *sa)
{
	const char ZEROES[] = "\x00\x00\x00\x00\x00\x00\x00\x00"
	    "\x00\x00\x00\x00\x00\x00\x00\x00";

	if (sa->sa_family == AF_INET) {
		const struct sockaddr_in *sin = (struct sockaddr_in *)sa;
		ev_uint32_t addr = ntohl(sin->sin_addr.s_addr);
		if (addr == 0 ||
		    EVUTIL_V4ADDR_IS_LOCALHOST(addr) ||
		    EVUTIL_V4ADDR_IS_CLASSD(addr)) {
			/* Not actually a usable external address. */
		} else {
			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;
		const unsigned char *addr =
		    (unsigned char*)sin6->sin6_addr.s6_addr;
		if (!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)) {
			/* This is a reserved, ipv4compat, ipv4map, loopback,
			 * link-local, multicast, or unspecified address. */
		} else {
			event_debug(("Detected an IPv6 interface"));
			had_ipv6_address = 1;
		}
	}
}

Project: libevent
File: evutil.c

evutil_free_globals_(void)
{
	evutil_free_secure_rng_globals_();
	evutil_free_sock_err_globals();
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

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
	}
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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
	}
}

Project: libevent
File: evutil.c

evutil_getenv_(const char *varname)
{
	if (evutil_issetugid())
		return NULL;

	return getenv(varname);
}

Project: libevent
File: evutil.c

evutil_global_setup_locks_(const int enable_locks)
{
	EVTHREAD_SETUP_GLOBAL_LOCK(windows_socket_errors_lock_, 0);
	return 0;
}

Project: libevent
File: evutil.c

evutil_global_setup_locks_(const int enable_locks)
{
	return 0;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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);
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

evutil_make_listen_socket_reuseable_port(evutil_socket_t sock)
{
#if defined __linux__ && defined(SO_REUSEPORT)
	int one = 1;
	/* REUSEPORT on Linux 3.9+ means, "Multiple servers (processes or
	 * threads) can bind to the same port if they each set the option. */
	return setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, (void*) &one,
	    (ev_socklen_t)sizeof(one));
#else
	return 0;
#endif
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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, "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 (!(flags & O_NONBLOCK)) {
			if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
				event_warn("fcntl(%d, F_SETFL)", fd);
				return -1;
			}
		}
	}
#endif
	return 0;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

evutil_memclear_(void *mem, size_t len)
{
	evutil_memset_volatile_(mem, 0, len);
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn)
{
	if (!evdns_getaddrinfo_impl)
		evdns_getaddrinfo_impl = fn;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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
}

Project: libevent
File: evutil.c

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;
	}
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

need_numeric_port_hack(void)
{
	if (!tested_for_getaddrinfo_hacks)
		test_for_getaddrinfo_hacks();
	return need_numeric_port_hack_;
}

Project: libevent
File: evutil.c

need_socktype_protocol_hack(void)
{
	if (!tested_for_getaddrinfo_hacks)
		test_for_getaddrinfo_hacks();
	return need_socktype_protocol_hack_;
}

Project: libevent
File: evutil.c

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;
}

Project: libevent
File: evutil.c

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;
}