src/newlib/winsup/cygwin/libc/rcmd.cc - stadia-controller/gcc-arm-none-eabi - Git at Google

 /*
  * Copyright (c) 1983, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
  * 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.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
  */

 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)rcmd.c	8.3 (Berkeley) 3/26/94";
 #endif /* LIBC_SCCS and not lint */
 #include <sys/cdefs.h>
 #ifndef __CYGWIN__
 __FBSDID("$FreeBSD$");
 #else
 #define  __INSIDE_CYGWIN_NET__
 #include "winsup.h"
 #undef  __INSIDE_CYGWIN_NET__
 #endif

 #ifndef __CYGWIN__
 #include "namespace.h"
 #endif
 #include <sys/param.h>
 #include <sys/socket.h>
 #include <sys/stat.h>

 #include <netinet/in.h>
 #include <arpa/inet.h>

 #include <signal.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <pwd.h>
 #include <errno.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
 #ifndef __CYGWIN__
 #include <rpc/rpc.h>
 #endif
 #ifdef YP
 #include <rpcsvc/yp_prot.h>
 #include <rpcsvc/ypclnt.h>
 #endif
 #ifndef __CYGWIN__
 #include <arpa/nameser.h>
 #include "un-namespace.h"
 #endif

 #ifndef __CYGWIN__
 extern int innetgr( const char *, const char *, const char *, const char * );

 #define max(a, b)	((a > b) ? a : b)
 #else
 #include "wininet.h"
 #include "cygwin/in6.h"

 #ifndef _PATH_HEQUIV
 # define _PATH_HEQUIV "/etc/hosts.equiv"
 #endif

 #define innetgr(a,b,c,d)	(0)

 extern int rcmdsh(char **, int, const char *, const char *, const char *,
 		  const char *);

 extern "C" {
   int cygwin_accept (int, struct sockaddr *, socklen_t *);
   int cygwin_bindresvport_sa (int, struct sockaddr *);
   int cygwin_connect (int, const struct sockaddr *, socklen_t);
   void cygwin_freeaddrinfo (struct addrinfo *);
   const char * cygwin_gai_strerror (int);
   int cygwin_getaddrinfo (const char *, const char *, const struct addrinfo *,
 			  struct addrinfo **);
   int cygwin_getnameinfo (const struct sockaddr *, socklen_t, char *, size_t,
   			  char *, size_t, int);
   struct servent *cygwin_getservbyname (const char *, const char *);
   int cygwin_listen (int, int);
   int cygwin_rresvport_af(int *alport, int family);
   int cygwin_select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
   int cygwin_socket (int, int, int);
   int seteuid32 (uid_t);
 }
 #endif

 #ifndef __CYGWIN__
 static int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
 static int __ivaliduser_af(FILE *,const void *, const char *, const char *,
 			   int, int);
 #endif
 static int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t,
 			   const char *, const char *);
 static int __icheckhost(const struct sockaddr *, socklen_t, const char *);

 char paddr[NI_MAXHOST];

 extern "C" int
 cygwin_rcmd_af(char **ahost, in_port_t rport, const char *locuser,
 	       const char *remuser, const char *cmd, int *fd2p, int af)
 {
 	struct addrinfo hints, *res, *ai;
 	struct sockaddr_storage from;
 	fd_set reads;
 	sigset_t oldmask, newmask;
 	pid_t pid;
 	int s, aport, lport, timo, error;
 	char c;//, *p;
 	int refused, nres;
 	char num[8];
 	static char canonnamebuf[INTERNET_MAX_HOST_NAME_LENGTH + 1];	/* is it proper here? */
 #ifndef __CYGWIN__
 	/* call rcmdsh() with specified remote shell if appropriate. */
 	if (!issetugid() && (p = getenv("RSH"))) {
 		struct servent *sp = cygwin_getservbyname("shell", "tcp");

 		if (sp && sp->s_port == rport)
 			return (rcmdsh(ahost, rport, locuser, remuser,
 			    cmd, p));
 	}

 	/* use rsh(1) if non-root and remote port is shell. */
 	if (geteuid()) {
 		struct servent *sp = cygwin_getservbyname("shell", "tcp");

 		if (sp && sp->s_port == rport)
 			return (rcmdsh(ahost, rport, locuser, remuser,
 			    cmd, NULL));
 	}
 #endif
 	pid = getpid();

 	memset(&hints, 0, sizeof(hints));
 	hints.ai_flags = AI_CANONNAME;
 	hints.ai_family = af;
 	hints.ai_socktype = SOCK_STREAM;
 	hints.ai_protocol = 0;
 	(void)snprintf(num, sizeof(num), "%d", ntohs(rport));
 	error = cygwin_getaddrinfo(*ahost, num, &hints, &res);
 	if (error) {
 		fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 			cygwin_gai_strerror(error));
 		if (error == EAI_SYSTEM)
 			fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 				strerror(errno));
 		return (-1);
 	}

 	if (res->ai_canonname
 	 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
 		strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
 		*ahost = canonnamebuf;
 	}
 	nres = 0;
 	for (ai = res; ai; ai = ai->ai_next)
 		nres++;
 	ai = res;
 	refused = 0;
 	sigemptyset(&newmask);
 	sigaddset(&newmask, SIGURG);
 	sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
 	for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 		s = cygwin_rresvport_af(&lport, ai->ai_family);
 		if (s < 0) {
 			if (errno != EAGAIN && ai->ai_next) {
 				ai = ai->ai_next;
 				continue;
 			}
 			if (errno == EAGAIN)
 				(void)fprintf(stderr,
 				    "rcmd: socket: All ports in use\n");
 			else
 				(void)fprintf(stderr, "rcmd: socket: %s\n",
 				    strerror(errno));
 			cygwin_freeaddrinfo(res);
 			sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
 			    NULL);
 			return (-1);
 		}
 		fcntl64(s, F_SETOWN, pid);
 		if (cygwin_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 			break;
 		(void)close(s);
 		if (errno == EADDRINUSE) {
 			lport--;
 			continue;
 		}
 		if (errno == ECONNREFUSED)
 			refused = 1;
 		if (ai->ai_next == NULL && (!refused || timo > 16)) {
 			(void)fprintf(stderr, "%s: %s\n",
 				      *ahost, strerror(errno));
 			cygwin_freeaddrinfo(res);
 			sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
 			    NULL);
 			return (-1);
 		}
 		if (nres > 1) {
 			int oerrno = errno;

 			cygwin_getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
 			    sizeof(paddr), NULL, 0, NI_NUMERICHOST);
 			(void)fprintf(stderr, "connect to address %s: ",
 				      paddr);
 			errno = oerrno;
 			perror(0);
 		}
 		if ((ai = ai->ai_next) == NULL) {
 			/* refused && timo <= 16 */
 			struct timespec time_to_sleep, time_remaining;

 			time_to_sleep.tv_sec = timo;
 			time_to_sleep.tv_nsec = 0;
 			(void)nanosleep(&time_to_sleep, &time_remaining);
 			timo *= 2;
 			ai = res;
 			refused = 0;
 		}
 		if (nres > 1) {
 			cygwin_getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
 			    sizeof(paddr), NULL, 0, NI_NUMERICHOST);
 			fprintf(stderr, "Trying %s...\n", paddr);
 		}
 	}
 	lport--;
 	if (fd2p == 0) {
 		write(s, "", 1);
 		lport = 0;
 	} else {
 		int s2 = cygwin_rresvport_af(&lport, ai->ai_family), s3;
 		socklen_t len = ai->ai_addrlen;
 		int nfds;

 		if (s2 < 0)
 			goto bad;
 		cygwin_listen(s2, 1);
 		(void)snprintf(num, sizeof(num), "%d", lport);
 		if (write(s, num, strlen(num)+1) != (int)strlen(num)+1) {
 			(void)fprintf(stderr,
 			    "rcmd: write (setting up stderr): %s\n",
 			    strerror(errno));
 			(void)close(s2);
 			goto bad;
 		}
 		nfds = max(s, s2)+1;
 		if(nfds > FD_SETSIZE) {
 			fprintf(stderr, "rcmd: too many files\n");
 			(void)close(s2);
 			goto bad;
 		}
 again:
 		FD_ZERO(&reads);
 		FD_SET(s, &reads);
 		FD_SET(s2, &reads);
 		errno = 0;
 		if (cygwin_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
 			if (errno != 0)
 				(void)fprintf(stderr,
 				    "rcmd: select (setting up stderr): %s\n",
 				    strerror(errno));
 			else
 				(void)fprintf(stderr,
 				"select: protocol failure in circuit setup\n");
 			(void)close(s2);
 			goto bad;
 		}
 		s3 = cygwin_accept(s2, (struct sockaddr *)&from, &len);
 		switch (from.ss_family) {
 		case AF_INET:
 			aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 			break;
 		case AF_INET6:
 			aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 			break;
 		default:
 			aport = 0;	/* error */
 			break;
 		}
 		/*
 		 * XXX careful for ftp bounce attacks. If discovered, shut them
 		 * down and check for the real auxiliary channel to connect.
 		 */
 		if (aport == 20) {
 			close(s3);
 			goto again;
 		}
 		(void)close(s2);
 		if (s3 < 0) {
 			(void)fprintf(stderr,
 			    "rcmd: accept: %s\n", strerror(errno));
 			lport = 0;
 			goto bad;
 		}
 		*fd2p = s3;
 		if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
 			(void)fprintf(stderr,
 			    "socket: protocol failure in circuit setup.\n");
 			goto bad2;
 		}
 	}
 	(void)write(s, locuser, strlen(locuser)+1);
 	(void)write(s, remuser, strlen(remuser)+1);
 	(void)write(s, cmd, strlen(cmd)+1);
 	if (read(s, &c, 1) != 1) {
 		(void)fprintf(stderr,
 		    "rcmd: %s: %s\n", *ahost, strerror(errno));
 		goto bad2;
 	}
 	if (c != 0) {
 		while (read(s, &c, 1) == 1) {
 			(void)write(STDERR_FILENO, &c, 1);
 			if (c == '\n')
 				break;
 		}
 		goto bad2;
 	}
 	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
 	cygwin_freeaddrinfo(res);
 	return (s);
 bad2:
 	if (lport)
 		(void)close(*fd2p);
 bad:
 	(void)close(s);
 	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
 	cygwin_freeaddrinfo(res);
 	return (-1);
 }

 extern "C" int
 cygwin_rcmd(char **ahost, in_port_t rport, const char *locuser,
 	    const char *remuser, const char *cmd, int *fd2p)
 {
 	return cygwin_rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p,
 			      AF_INET);
 }

 extern "C" int
 cygwin_rresvport_af(int *alport, int family)
 {
 	int s;
 	struct sockaddr_storage ss;
 	u_int16_t *sport;

 	memset(&ss, 0, sizeof(ss));
 	ss.ss_family = family;
 	switch (family) {
 	case AF_INET:
 		sport = &((struct sockaddr_in *)&ss)->sin_port;
 		((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
 		break;
 	case AF_INET6:
 		sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 		((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
 		break;
 	default:
 		errno = EAFNOSUPPORT;
 		return -1;
 	}

 	s = cygwin_socket(ss.ss_family, SOCK_STREAM, 0);
 	if (s < 0)
 		return (-1);
 #if 0 /* compat_exact_traditional_rresvport_semantics */
 	sin.sin_port = htons((u_short)*alport);
 	if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 		return (s);
 	if (errno != EADDRINUSE) {
 		(void)_close(s);
 		return (-1);
 	}
 #endif
 	*sport = 0;
 	if (cygwin_bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
 		(void)close(s);
 		return (-1);
 	}
 	*alport = (int)ntohs(*sport);
 	return (s);
 }

 extern "C" int
 cygwin_rresvport(int *port)
 {
 	return cygwin_rresvport_af(port, AF_INET);
 }

 int	__check_rhosts_file = 1;
 char	*__rcmd_errstr;

 /*
  * AF independent extension of iruserok.
  *
  * Returns 0 if ok, -1 if not ok.
  */
 extern "C" int
 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser,
 	    const char *luser)
 {
 	const char *cp;
 	struct stat sbuf;
 	struct passwd *pwd;
 	FILE *hostf;
 	uid_t uid;
 	int first;
 	char pbuf[MAXPATHLEN];
 	const struct sockaddr *raddr;
 	struct sockaddr_storage ss;

 	/* avoid alignment issue */
 	if (rlen > (int) sizeof(ss))
 		return(-1);
 	memcpy(&ss, ra, rlen);
 	raddr = (struct sockaddr *)&ss;

 	first = 1;
 	hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "rt");
 again:
 	if (hostf) {
 		if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 			(void)fclose(hostf);
 			return (0);
 		}
 		(void)fclose(hostf);
 	}
 	if (first == 1 && (__check_rhosts_file || superuser)) {
 		first = 0;
 		if ((pwd = getpwnam(luser)) == NULL)
 			return (-1);
 		(void)strcpy(pbuf, pwd->pw_dir);
 		(void)strcat(pbuf, "/.rhosts");

 		/*
 		 * Change effective uid while opening .rhosts.  If root and
 		 * reading an NFS mounted file system, can't read files that
 		 * are protected read/write owner only.
 		 */
 		uid = geteuid32();
 		(void)seteuid32(pwd->pw_uid);
 		hostf = fopen(pbuf, "rt");
 		(void)seteuid32(uid);

 		if (hostf == NULL)
 			return (-1);
 		/*
 		 * If not a regular file, or is owned by someone other than
 		 * user or root or if writeable by anyone but the owner, quit.
 		 */
 		cp = NULL;
 		if (lstat64(pbuf, &sbuf) < 0)
 			cp = ".rhosts lstat failed";
 		else if (!S_ISREG(sbuf.st_mode))
 			cp = ".rhosts not regular file";
 		else if (fstat64(fileno(hostf), &sbuf) < 0)
 			cp = ".rhosts fstat failed";
 		else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 			cp = "bad .rhosts owner";
 		else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 			cp = ".rhosts writeable by other than owner";
 		/* If there were any problems, quit. */
 		if (cp) {
 			__rcmd_errstr = (char *) cp;
 			(void)fclose(hostf);
 			return (-1);
 		}
 		goto again;
 	}
 	return (-1);
 }

 /*
  * New .rhosts strategy: We are passed an ip address. We spin through
  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
  * has ip addresses, we don't have to trust a nameserver.  When it
  * contains hostnames, we spin through the list of addresses the nameserver
  * gives us and look for a match.
  *
  * Returns 0 if ok, -1 if not ok.
  */
 extern "C" int
 iruserok(unsigned long raddr, int superuser, const char *ruser,
 	 const char *luser)
 {
 	struct sockaddr_in sin;

 	memset(&sin, 0, sizeof(sin));
 	sin.sin_family = AF_INET;
 	memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 	return iruserok_sa((struct sockaddr *)&sin, sizeof(struct sockaddr_in),
 			   superuser, ruser, luser);
 }

 extern "C" int
 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
 {
 	struct addrinfo hints, *res, *r;
 	int error;

 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
 	error = cygwin_getaddrinfo(rhost, "0", &hints, &res);
 	if (error)
 		return (-1);

 	for (r = res; r; r = r->ai_next) {
 		if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 		    luser) == 0) {
 			cygwin_freeaddrinfo(res);
 			return (0);
 		}
 	}
 	cygwin_freeaddrinfo(res);
 	return (-1);
 }

 #ifndef __CYGWIN__
 /*
  * XXX
  * Don't make static, used by lpd(8).
  *
  * Returns 0 if ok, -1 if not ok.
  */
 static int
 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
 {
 	struct sockaddr_in sin;

 	memset(&sin, 0, sizeof(sin));
 	sin.sin_family = AF_INET;
 	memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 	return __ivaliduser_sa(hostf, (struct sockaddr *)&sin,
 			       sizeof(struct sockaddr_in), luser, ruser);
 }

 /*
  * Returns 0 if ok, -1 if not ok.
  *
  * XXX obsolete API.
  */
 static int
 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser,
 		const char *ruser, int af, int len)
 {
 	struct sockaddr *sa = NULL;
 	struct sockaddr_in *sin = NULL;
 #ifdef INET6
 	struct sockaddr_in6 *sin6 = NULL;
 #endif
 	struct sockaddr_storage ss;
 	int salen = 0;

 	memset(&ss, 0, sizeof(ss));
 	switch (af) {
 	case AF_INET:
 		if (len != sizeof(sin->sin_addr))
 			return -1;
 		sin = (struct sockaddr_in *)&ss;
 		sin->sin_family = AF_INET;
 		salen = sizeof(struct sockaddr_in);
 		memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 		break;
 	case AF_INET6:
 		if (len != sizeof(sin6->sin6_addr))
 			return -1;
 		/* you will lose scope info */
 		sin6 = (struct sockaddr_in6 *)&ss;
 		sin6->sin6_family = AF_INET6;
 		salen = sizeof(struct sockaddr_in6);
 		memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 		break;
 	default:
 		return -1;
 	}

 	sa = (struct sockaddr *)&ss;
 	return __ivaliduser_sa(hostf, sa, salen, luser, ruser);
 }
 #endif

 static int
 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen,
 		const char *luser, const char *ruser)
 {
 	char *user, *p;
 	int ch;
 	char buf[MAXHOSTNAMELEN + 128];		/* host + login */
 	char hname[MAXHOSTNAMELEN];
 	/* Presumed guilty until proven innocent. */
 	int userok = 0, hostok = 0;
 #ifdef YP
 	char *ypdomain;

 	if (yp_get_default_domain(&ypdomain))
 		ypdomain = NULL;
 #else
 #define	ypdomain NULL
 #endif
 	/* We need to get the damn hostname back for netgroup matching. */
 	if (cygwin_getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
 			NI_NAMEREQD) != 0)
 		hname[0] = '\0';

 	while (fgets(buf, sizeof(buf), hostf)) {
 		p = buf;
 		/* Skip lines that are too long. */
 		if (strchr(p, '\n') == NULL) {
 			while ((ch = getc(hostf)) != '\n' && ch != EOF);
 			continue;
 		}
 		if (*p == '\n' || *p == '#') {
 			/* comment... */
 			continue;
 		}
 		while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 			*p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 			p++;
 		}
 		if (*p == ' ' || *p == '\t') {
 			*p++ = '\0';
 			while (*p == ' ' || *p == '\t')
 				p++;
 			user = p;
 			while (*p != '\n' && *p != ' ' &&
 			    *p != '\t' && *p != '\0')
 				p++;
 		} else
 			user = p;
 		*p = '\0';
 		/*
 		 * Do +/- and +@/-@ checking. This looks really nasty,
 		 * but it matches SunOS's behavior so far as I can tell.
 		 */
 		switch(buf[0]) {
 		case '+':
 			if (!buf[1]) {     /* '+' matches all hosts */
 				hostok = 1;
 				break;
 			}
 			if (buf[1] == '@')  /* match a host by netgroup */
 				hostok = hname[0] != '\0' &&
 				    innetgr(&buf[2], hname, NULL, ypdomain);
 			else		/* match a host by addr */
 				hostok = __icheckhost(raddr, salen,
 						      (char *)&buf[1]);
 			break;
 		case '-':     /* reject '-' hosts and all their users */
 			if (buf[1] == '@') {
 				if (hname[0] == '\0' ||
 				    innetgr(&buf[2], hname, NULL, ypdomain))
 					return(-1);
 			} else {
 				if (__icheckhost(raddr, salen,
 						 (char *)&buf[1]))
 					return(-1);
 			}
 			break;
 		default:  /* if no '+' or '-', do a simple match */
 			hostok = __icheckhost(raddr, salen, buf);
 			break;
 		}
 		switch(*user) {
 		case '+':
 			if (!*(user+1)) {      /* '+' matches all users */
 				userok = 1;
 				break;
 			}
 			if (*(user+1) == '@')  /* match a user by netgroup */
 				userok = innetgr(user+2, NULL, ruser, ypdomain);
 			else	   /* match a user by direct specification */
 				userok = !(strcmp(ruser, user+1));
 			break;
 		case '-': 		/* if we matched a hostname, */
 			if (hostok) {   /* check for user field rejections */
 				if (!*(user+1))
 					return(-1);
 				if (*(user+1) == '@') {
 					if (innetgr(user+2, NULL,
 							ruser, ypdomain))
 						return(-1);
 				} else {
 					if (!strcmp(ruser, user+1))
 						return(-1);
 				}
 			}
 			break;
 		default:	/* no rejections: try to match the user */
 			if (hostok)
 				userok = !(strcmp(ruser,*user ? user : luser));
 			break;
 		}
 		if (hostok && userok)
 			return(0);
 	}
 	return (-1);
 }

 /*
  * Returns "true" if match, 0 if no match.
  */
 static int
 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost)
 {
 	struct sockaddr_in sin;
 	struct sockaddr_in6 *sin6;
 	struct addrinfo hints, *res, *r;
 	int error;
 	char h1[NI_MAXHOST], h2[NI_MAXHOST];

 	if (raddr->sa_family == AF_INET6) {
 		sin6 = (struct sockaddr_in6 *)raddr;
 		if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 			memset(&sin, 0, sizeof(sin));
 			sin.sin_family = AF_INET;
 			memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 			       sizeof(sin.sin_addr));
 			raddr = (struct sockaddr *)&sin;
 			salen = sizeof(struct sockaddr_in);
 		}
 	}

 	h1[0] = '\0';
 	if (cygwin_getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 			NI_NUMERICHOST) != 0)
 		return (0);

 	/* Resolve laddr into sockaddr */
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = raddr->sa_family;
 	hints.ai_socktype = SOCK_DGRAM;	/*XXX dummy*/
 	res = NULL;
 	error = cygwin_getaddrinfo(lhost, "0", &hints, &res);
 	if (error)
 		return (0);

 	for (r = res; r ; r = r->ai_next) {
 		h2[0] = '\0';
 		if (cygwin_getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 				NULL, 0, NI_NUMERICHOST) != 0)
 			continue;
 		if (strcmp(h1, h2) == 0) {
 			cygwin_freeaddrinfo(res);
 			return (1);
 		}
 	}

 	/* No match. */
 	cygwin_freeaddrinfo(res);
 	return (0);
 }
	/*
	* Copyright (c) 1983, 1993, 1994
	* The Regents of the University of California. All rights reserved.
	*
	* 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.
	* 4. Neither the name of the University nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
	*/

	#if defined(LIBC_SCCS) && !defined(lint)
	static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
	#endif /* LIBC_SCCS and not lint */
	#include <sys/cdefs.h>
	#ifndef __CYGWIN__
	__FBSDID("$FreeBSD$");
	#else
	#define __INSIDE_CYGWIN_NET__
	#include "winsup.h"
	#undef __INSIDE_CYGWIN_NET__
	#endif

	#ifndef __CYGWIN__
	#include "namespace.h"
	#endif
	#include <sys/param.h>
	#include <sys/socket.h>
	#include <sys/stat.h>

	#include <netinet/in.h>
	#include <arpa/inet.h>

	#include <signal.h>
	#include <fcntl.h>
	#include <netdb.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <pwd.h>
	#include <errno.h>
	#include <stdio.h>
	#include <ctype.h>
	#include <string.h>
	#ifndef __CYGWIN__
	#include <rpc/rpc.h>
	#endif
	#ifdef YP
	#include <rpcsvc/yp_prot.h>
	#include <rpcsvc/ypclnt.h>
	#endif
	#ifndef __CYGWIN__
	#include <arpa/nameser.h>
	#include "un-namespace.h"
	#endif

	#ifndef __CYGWIN__
	extern int innetgr( const char , const char , const char , const char );

	#define max(a, b) ((a > b) ? a : b)
	#else
	#include "wininet.h"
	#include "cygwin/in6.h"

	#ifndef _PATH_HEQUIV
	# define _PATH_HEQUIV "/etc/hosts.equiv"
	#endif

	#define innetgr(a,b,c,d) (0)

	extern int rcmdsh(char *, int, const char , const char , const char ,
	const char *);

	extern "C" {
	int cygwin_accept (int, struct sockaddr , socklen_t );
	int cygwin_bindresvport_sa (int, struct sockaddr *);
	int cygwin_connect (int, const struct sockaddr *, socklen_t);
	void cygwin_freeaddrinfo (struct addrinfo *);
	const char * cygwin_gai_strerror (int);
	int cygwin_getaddrinfo (const char , const char , const struct addrinfo *,
	struct addrinfo **);
	int cygwin_getnameinfo (const struct sockaddr , socklen_t, char , size_t,
	char *, size_t, int);
	struct servent cygwin_getservbyname (const char , const char *);
	int cygwin_listen (int, int);
	int cygwin_rresvport_af(int *alport, int family);
	int cygwin_select (int, fd_set , fd_set , fd_set , struct timeval );
	int cygwin_socket (int, int, int);
	int seteuid32 (uid_t);
	}
	#endif

	#ifndef __CYGWIN__
	static int __ivaliduser(FILE , u_int32_t, const char , const char *);
	static int __ivaliduser_af(FILE ,const void , const char , const char ,
	int, int);
	#endif
	static int __ivaliduser_sa(FILE , const struct sockaddr , socklen_t,
	const char , const char );
	static int __icheckhost(const struct sockaddr , socklen_t, const char );

	char paddr[NI_MAXHOST];

	extern "C" int
	cygwin_rcmd_af(char *ahost, in_port_t rport, const char locuser,
	const char remuser, const char cmd, int *fd2p, int af)
	{
	struct addrinfo hints, res, ai;
	struct sockaddr_storage from;
	fd_set reads;
	sigset_t oldmask, newmask;
	pid_t pid;
	int s, aport, lport, timo, error;
	char c;//, *p;
	int refused, nres;
	char num[8];
	static char canonnamebuf[INTERNET_MAX_HOST_NAME_LENGTH + 1]; /* is it proper here? */
	#ifndef __CYGWIN__
	/* call rcmdsh() with specified remote shell if appropriate. */
	if (!issetugid() && (p = getenv("RSH"))) {
	struct servent *sp = cygwin_getservbyname("shell", "tcp");

	if (sp && sp->s_port == rport)
	return (rcmdsh(ahost, rport, locuser, remuser,
	cmd, p));
	}

	/* use rsh(1) if non-root and remote port is shell. */
	if (geteuid()) {
	struct servent *sp = cygwin_getservbyname("shell", "tcp");

	if (sp && sp->s_port == rport)
	return (rcmdsh(ahost, rport, locuser, remuser,
	cmd, NULL));
	}
	#endif
	pid = getpid();

	memset(&hints, 0, sizeof(hints));
	hints.ai_flags = AI_CANONNAME;
	hints.ai_family = af;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = 0;
	(void)snprintf(num, sizeof(num), "%d", ntohs(rport));
	error = cygwin_getaddrinfo(*ahost, num, &hints, &res);
	if (error) {
	fprintf(stderr, "rcmd: getaddrinfo: %s\n",
	cygwin_gai_strerror(error));
	if (error == EAI_SYSTEM)
	fprintf(stderr, "rcmd: getaddrinfo: %s\n",
	strerror(errno));
	return (-1);
	}

	if (res->ai_canonname
	&& strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
	strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
	*ahost = canonnamebuf;
	}
	nres = 0;
	for (ai = res; ai; ai = ai->ai_next)
	nres++;
	ai = res;
	refused = 0;
	sigemptyset(&newmask);
	sigaddset(&newmask, SIGURG);
	sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
	for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
	s = cygwin_rresvport_af(&lport, ai->ai_family);
	if (s < 0) {
	if (errno != EAGAIN && ai->ai_next) {
	ai = ai->ai_next;
	continue;
	}
	if (errno == EAGAIN)
	(void)fprintf(stderr,
	"rcmd: socket: All ports in use\n");
	else
	(void)fprintf(stderr, "rcmd: socket: %s\n",
	strerror(errno));
	cygwin_freeaddrinfo(res);
	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
	NULL);
	return (-1);
	}
	fcntl64(s, F_SETOWN, pid);
	if (cygwin_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
	break;
	(void)close(s);
	if (errno == EADDRINUSE) {
	lport--;
	continue;
	}
	if (errno == ECONNREFUSED)
	refused = 1;
	if (ai->ai_next == NULL && (!refused \|\| timo > 16)) {
	(void)fprintf(stderr, "%s: %s\n",
	*ahost, strerror(errno));
	cygwin_freeaddrinfo(res);
	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
	NULL);
	return (-1);
	}
	if (nres > 1) {
	int oerrno = errno;

	cygwin_getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
	sizeof(paddr), NULL, 0, NI_NUMERICHOST);
	(void)fprintf(stderr, "connect to address %s: ",
	paddr);
	errno = oerrno;
	perror(0);
	}
	if ((ai = ai->ai_next) == NULL) {
	/* refused && timo <= 16 */
	struct timespec time_to_sleep, time_remaining;

	time_to_sleep.tv_sec = timo;
	time_to_sleep.tv_nsec = 0;
	(void)nanosleep(&time_to_sleep, &time_remaining);
	timo *= 2;
	ai = res;
	refused = 0;
	}
	if (nres > 1) {
	cygwin_getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
	sizeof(paddr), NULL, 0, NI_NUMERICHOST);
	fprintf(stderr, "Trying %s...\n", paddr);
	}
	}
	lport--;
	if (fd2p == 0) {
	write(s, "", 1);
	lport = 0;
	} else {
	int s2 = cygwin_rresvport_af(&lport, ai->ai_family), s3;
	socklen_t len = ai->ai_addrlen;
	int nfds;

	if (s2 < 0)
	goto bad;
	cygwin_listen(s2, 1);
	(void)snprintf(num, sizeof(num), "%d", lport);
	if (write(s, num, strlen(num)+1) != (int)strlen(num)+1) {
	(void)fprintf(stderr,
	"rcmd: write (setting up stderr): %s\n",
	strerror(errno));
	(void)close(s2);
	goto bad;
	}
	nfds = max(s, s2)+1;
	if(nfds > FD_SETSIZE) {
	fprintf(stderr, "rcmd: too many files\n");
	(void)close(s2);
	goto bad;
	}
	again:
	FD_ZERO(&reads);
	FD_SET(s, &reads);
	FD_SET(s2, &reads);
	errno = 0;
	if (cygwin_select(nfds, &reads, 0, 0, 0) < 1 \|\| !FD_ISSET(s2, &reads)){
	if (errno != 0)
	(void)fprintf(stderr,
	"rcmd: select (setting up stderr): %s\n",
	strerror(errno));
	else
	(void)fprintf(stderr,
	"select: protocol failure in circuit setup\n");
	(void)close(s2);
	goto bad;
	}
	s3 = cygwin_accept(s2, (struct sockaddr *)&from, &len);
	switch (from.ss_family) {
	case AF_INET:
	aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
	break;
	case AF_INET6:
	aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
	break;
	default:
	aport = 0; /* error */
	break;
	}
	/*
	* XXX careful for ftp bounce attacks. If discovered, shut them
	* down and check for the real auxiliary channel to connect.
	*/
	if (aport == 20) {
	close(s3);
	goto again;
	}
	(void)close(s2);
	if (s3 < 0) {
	(void)fprintf(stderr,
	"rcmd: accept: %s\n", strerror(errno));
	lport = 0;
	goto bad;
	}
	*fd2p = s3;
	if (aport >= IPPORT_RESERVED \|\| aport < IPPORT_RESERVED / 2) {
	(void)fprintf(stderr,
	"socket: protocol failure in circuit setup.\n");
	goto bad2;
	}
	}
	(void)write(s, locuser, strlen(locuser)+1);
	(void)write(s, remuser, strlen(remuser)+1);
	(void)write(s, cmd, strlen(cmd)+1);
	if (read(s, &c, 1) != 1) {
	(void)fprintf(stderr,
	"rcmd: %s: %s\n", *ahost, strerror(errno));
	goto bad2;
	}
	if (c != 0) {
	while (read(s, &c, 1) == 1) {
	(void)write(STDERR_FILENO, &c, 1);
	if (c == '\n')
	break;
	}
	goto bad2;
	}
	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
	cygwin_freeaddrinfo(res);
	return (s);
	bad2:
	if (lport)
	(void)close(*fd2p);
	bad:
	(void)close(s);
	sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
	cygwin_freeaddrinfo(res);
	return (-1);
	}

	extern "C" int
	cygwin_rcmd(char *ahost, in_port_t rport, const char locuser,
	const char remuser, const char cmd, int *fd2p)
	{
	return cygwin_rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p,
	AF_INET);
	}

	extern "C" int
	cygwin_rresvport_af(int *alport, int family)
	{
	int s;
	struct sockaddr_storage ss;
	u_int16_t *sport;

	memset(&ss, 0, sizeof(ss));
	ss.ss_family = family;
	switch (family) {
	case AF_INET:
	sport = &((struct sockaddr_in *)&ss)->sin_port;
	((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
	break;
	case AF_INET6:
	sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
	((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
	break;
	default:
	errno = EAFNOSUPPORT;
	return -1;
	}

	s = cygwin_socket(ss.ss_family, SOCK_STREAM, 0);
	if (s < 0)
	return (-1);
	#if 0 /* compat_exact_traditional_rresvport_semantics */
	sin.sin_port = htons((u_short)*alport);
	if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
	return (s);
	if (errno != EADDRINUSE) {
	(void)_close(s);
	return (-1);
	}
	#endif
	*sport = 0;
	if (cygwin_bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
	(void)close(s);
	return (-1);
	}
	alport = (int)ntohs(sport);
	return (s);
	}

	extern "C" int
	cygwin_rresvport(int *port)
	{
	return cygwin_rresvport_af(port, AF_INET);
	}

	int __check_rhosts_file = 1;
	char *__rcmd_errstr;

	/*
	* AF independent extension of iruserok.
	*
	* Returns 0 if ok, -1 if not ok.
	*/
	extern "C" int
	iruserok_sa(const void ra, int rlen, int superuser, const char ruser,
	const char *luser)
	{
	const char *cp;
	struct stat sbuf;
	struct passwd *pwd;
	FILE *hostf;
	uid_t uid;
	int first;
	char pbuf[MAXPATHLEN];
	const struct sockaddr *raddr;
	struct sockaddr_storage ss;

	/* avoid alignment issue */
	if (rlen > (int) sizeof(ss))
	return(-1);
	memcpy(&ss, ra, rlen);
	raddr = (struct sockaddr *)&ss;

	first = 1;
	hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "rt");
	again:
	if (hostf) {
	if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
	(void)fclose(hostf);
	return (0);
	}
	(void)fclose(hostf);
	}
	if (first == 1 && (__check_rhosts_file \|\| superuser)) {
	first = 0;
	if ((pwd = getpwnam(luser)) == NULL)
	return (-1);
	(void)strcpy(pbuf, pwd->pw_dir);
	(void)strcat(pbuf, "/.rhosts");

	/*
	* Change effective uid while opening .rhosts. If root and
	* reading an NFS mounted file system, can't read files that
	* are protected read/write owner only.
	*/
	uid = geteuid32();
	(void)seteuid32(pwd->pw_uid);
	hostf = fopen(pbuf, "rt");
	(void)seteuid32(uid);

	if (hostf == NULL)
	return (-1);
	/*
	* If not a regular file, or is owned by someone other than
	* user or root or if writeable by anyone but the owner, quit.
	*/
	cp = NULL;
	if (lstat64(pbuf, &sbuf) < 0)
	cp = ".rhosts lstat failed";
	else if (!S_ISREG(sbuf.st_mode))
	cp = ".rhosts not regular file";
	else if (fstat64(fileno(hostf), &sbuf) < 0)
	cp = ".rhosts fstat failed";
	else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
	cp = "bad .rhosts owner";
	else if (sbuf.st_mode & (S_IWGRP\|S_IWOTH))
	cp = ".rhosts writeable by other than owner";
	/* If there were any problems, quit. */
	if (cp) {
	__rcmd_errstr = (char *) cp;
	(void)fclose(hostf);
	return (-1);
	}
	goto again;
	}
	return (-1);
	}

	/*
	* New .rhosts strategy: We are passed an ip address. We spin through
	* hosts.equiv and .rhosts looking for a match. When the .rhosts only
	* has ip addresses, we don't have to trust a nameserver. When it
	* contains hostnames, we spin through the list of addresses the nameserver
	* gives us and look for a match.
	*
	* Returns 0 if ok, -1 if not ok.
	*/
	extern "C" int
	iruserok(unsigned long raddr, int superuser, const char *ruser,
	const char *luser)
	{
	struct sockaddr_in sin;

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
	return iruserok_sa((struct sockaddr *)&sin, sizeof(struct sockaddr_in),
	superuser, ruser, luser);
	}

	extern "C" int
	ruserok(const char rhost, int superuser, const char ruser, const char *luser)
	{
	struct addrinfo hints, res, r;
	int error;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = PF_UNSPEC;
	hints.ai_socktype = SOCK_DGRAM; /dummy/
	error = cygwin_getaddrinfo(rhost, "0", &hints, &res);
	if (error)
	return (-1);

	for (r = res; r; r = r->ai_next) {
	if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
	luser) == 0) {
	cygwin_freeaddrinfo(res);
	return (0);
	}
	}
	cygwin_freeaddrinfo(res);
	return (-1);
	}

	#ifndef __CYGWIN__
	/*
	* XXX
	* Don't make static, used by lpd(8).
	*
	* Returns 0 if ok, -1 if not ok.
	*/
	static int
	__ivaliduser(FILE hostf, u_int32_t raddr, const char luser, const char *ruser)
	{
	struct sockaddr_in sin;

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
	return __ivaliduser_sa(hostf, (struct sockaddr *)&sin,
	sizeof(struct sockaddr_in), luser, ruser);
	}

	/*
	* Returns 0 if ok, -1 if not ok.
	*
	* XXX obsolete API.
	*/
	static int
	__ivaliduser_af(FILE hostf, const void raddr, const char *luser,
	const char *ruser, int af, int len)
	{
	struct sockaddr *sa = NULL;
	struct sockaddr_in *sin = NULL;
	#ifdef INET6
	struct sockaddr_in6 *sin6 = NULL;
	#endif
	struct sockaddr_storage ss;
	int salen = 0;

	memset(&ss, 0, sizeof(ss));
	switch (af) {
	case AF_INET:
	if (len != sizeof(sin->sin_addr))
	return -1;
	sin = (struct sockaddr_in *)&ss;
	sin->sin_family = AF_INET;
	salen = sizeof(struct sockaddr_in);
	memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
	break;
	case AF_INET6:
	if (len != sizeof(sin6->sin6_addr))
	return -1;
	/* you will lose scope info */
	sin6 = (struct sockaddr_in6 *)&ss;
	sin6->sin6_family = AF_INET6;
	salen = sizeof(struct sockaddr_in6);
	memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
	break;
	default:
	return -1;
	}

	sa = (struct sockaddr *)&ss;
	return __ivaliduser_sa(hostf, sa, salen, luser, ruser);
	}
	#endif

	static int
	__ivaliduser_sa(FILE hostf, const struct sockaddr raddr, socklen_t salen,
	const char luser, const char ruser)
	{
	char user, p;
	int ch;
	char buf[MAXHOSTNAMELEN + 128]; /* host + login */
	char hname[MAXHOSTNAMELEN];
	/* Presumed guilty until proven innocent. */
	int userok = 0, hostok = 0;
	#ifdef YP
	char *ypdomain;

	if (yp_get_default_domain(&ypdomain))
	ypdomain = NULL;
	#else
	#define ypdomain NULL
	#endif
	/* We need to get the damn hostname back for netgroup matching. */
	if (cygwin_getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
	NI_NAMEREQD) != 0)
	hname[0] = '\0';

	while (fgets(buf, sizeof(buf), hostf)) {
	p = buf;
	/* Skip lines that are too long. */
	if (strchr(p, '\n') == NULL) {
	while ((ch = getc(hostf)) != '\n' && ch != EOF);
	continue;
	}
	if (p == '\n' \|\| p == '#') {
	/* comment... */
	continue;
	}
	while (p != '\n' && p != ' ' && p != '\t' && p != '\0') {
	p = isupper((unsigned char)p) ? tolower((unsigned char)p) : p;
	p++;
	}
	if (p == ' ' \|\| p == '\t') {
	*p++ = '\0';
	while (p == ' ' \|\| p == '\t')
	p++;
	user = p;
	while (p != '\n' && p != ' ' &&
	p != '\t' && p != '\0')
	p++;
	} else
	user = p;
	*p = '\0';
	/*
	* Do +/- and +@/-@ checking. This looks really nasty,
	* but it matches SunOS's behavior so far as I can tell.
	*/
	switch(buf[0]) {
	case '+':
	if (!buf[1]) { /* '+' matches all hosts */
	hostok = 1;
	break;
	}
	if (buf[1] == '@') /* match a host by netgroup */
	hostok = hname[0] != '\0' &&
	innetgr(&buf[2], hname, NULL, ypdomain);
	else /* match a host by addr */
	hostok = __icheckhost(raddr, salen,
	(char *)&buf[1]);
	break;
	case '-': /* reject '-' hosts and all their users */
	if (buf[1] == '@') {
	if (hname[0] == '\0' \|\|
	innetgr(&buf[2], hname, NULL, ypdomain))
	return(-1);
	} else {
	if (__icheckhost(raddr, salen,
	(char *)&buf[1]))
	return(-1);
	}
	break;
	default: /* if no '+' or '-', do a simple match */
	hostok = __icheckhost(raddr, salen, buf);
	break;
	}
	switch(*user) {
	case '+':
	if (!(user+1)) { / '+' matches all users */
	userok = 1;
	break;
	}
	if ((user+1) == '@') / match a user by netgroup */
	userok = innetgr(user+2, NULL, ruser, ypdomain);
	else /* match a user by direct specification */
	userok = !(strcmp(ruser, user+1));
	break;
	case '-': /* if we matched a hostname, */
	if (hostok) { /* check for user field rejections */
	if (!*(user+1))
	return(-1);
	if (*(user+1) == '@') {
	if (innetgr(user+2, NULL,
	ruser, ypdomain))
	return(-1);
	} else {
	if (!strcmp(ruser, user+1))
	return(-1);
	}
	}
	break;
	default: /* no rejections: try to match the user */
	if (hostok)
	userok = !(strcmp(ruser,*user ? user : luser));
	break;
	}
	if (hostok && userok)
	return(0);
	}
	return (-1);
	}

	/*
	* Returns "true" if match, 0 if no match.
	*/
	static int
	__icheckhost(const struct sockaddr raddr, socklen_t salen, const char lhost)
	{
	struct sockaddr_in sin;
	struct sockaddr_in6 *sin6;
	struct addrinfo hints, res, r;
	int error;
	char h1[NI_MAXHOST], h2[NI_MAXHOST];

	if (raddr->sa_family == AF_INET6) {
	sin6 = (struct sockaddr_in6 *)raddr;
	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
	sizeof(sin.sin_addr));
	raddr = (struct sockaddr *)&sin;
	salen = sizeof(struct sockaddr_in);
	}
	}

	h1[0] = '\0';
	if (cygwin_getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
	NI_NUMERICHOST) != 0)
	return (0);

	/* Resolve laddr into sockaddr */
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = raddr->sa_family;
	hints.ai_socktype = SOCK_DGRAM; /XXX dummy/
	res = NULL;
	error = cygwin_getaddrinfo(lhost, "0", &hints, &res);
	if (error)
	return (0);

	for (r = res; r ; r = r->ai_next) {
	h2[0] = '\0';
	if (cygwin_getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
	NULL, 0, NI_NUMERICHOST) != 0)
	continue;
	if (strcmp(h1, h2) == 0) {
	cygwin_freeaddrinfo(res);
	return (1);
	}
	}

	/* No match. */
	cygwin_freeaddrinfo(res);
	return (0);
	}