/* * Copyright (c) 1980, 1993 *	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. */#define __FORCE_GLIBC#include <features.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <alloca.h>#include <stdio.h>#include <netdb.h>#include <errno.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#define SA_LEN(_x)      __libc_sa_len((_x)->sa_family)extern int __libc_sa_len (sa_family_t __af) __THROW;int	rexecoptions;char	ahostbuf[NI_MAXHOST];extern int ruserpass(const char *host, const char **aname, const char **apass);intrexec_af(ahost, rport, name, pass, cmd, fd2p, af)	char **ahost;	int rport;	const char *name, *pass, *cmd;	int *fd2p;	sa_family_t af;{	struct sockaddr_storage sa2, from;	struct addrinfo hints, *res0;	const char *orig_name = name;	const char *orig_pass = pass;	u_short port = 0;	int s, timo = 1, s3;	char c;	int gai;	char servbuff[NI_MAXSERV];	snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));	servbuff[sizeof(servbuff) - 1] = '\0';	memset(&hints, 0, sizeof(hints));	hints.ai_family = af;	hints.ai_socktype = SOCK_STREAM;	hints.ai_flags = AI_CANONNAME;	gai = getaddrinfo(*ahost, servbuff, &hints, &res0);	if (gai){		/* XXX: set errno? */		return -1;	}	if (res0->ai_canonname){		strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf));		ahostbuf[sizeof(ahostbuf)-1] = '\0';		*ahost = ahostbuf;	}	else{		*ahost = NULL;	}	ruserpass(res0->ai_canonname, &name, &pass);retry:	s = socket(res0->ai_family, res0->ai_socktype, 0);	if (s < 0) {		perror("rexec: socket");		return (-1);	}	if (connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {		if (errno == ECONNREFUSED && timo <= 16) {			(void) close(s);			sleep(timo);			timo *= 2;			goto retry;		}		perror(res0->ai_canonname);		return (-1);	}	if (fd2p == 0) {		(void) write(s, "", 1);		port = 0;	} else {		char num[32];		int s2, sa2len;		s2 = socket(res0->ai_family, res0->ai_socktype, 0);		if (s2 < 0) {			(void) close(s);			return (-1);		}		listen(s2, 1);		sa2len = sizeof (sa2);		if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {			perror("getsockname");			(void) close(s2);			goto bad;		} else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {			__set_errno(EINVAL);			(void) close(s2);			goto bad;		}		port = 0;		if (!getnameinfo((struct sockaddr *)&sa2, sa2len,				 NULL, 0, servbuff, sizeof(servbuff),				 NI_NUMERICSERV))			port = atoi(servbuff);		(void) sprintf(num, "%u", port);		(void) write(s, num, strlen(num)+1);		{ socklen_t len = sizeof (from);		  s3 = accept(s2, (struct sockaddr *)&from, &len);		  close(s2);		  if (s3 < 0) {			perror("accept");			port = 0;			goto bad;		  }		}		*fd2p = s3;	}	(void) write(s, name, strlen(name) + 1);	/* should public key encypt the password here */	(void) write(s, pass, strlen(pass) + 1);	(void) write(s, cmd, strlen(cmd) + 1);	/* We don't need the memory allocated for the name and the password	   in ruserpass anymore.  */	if (name != orig_name)	  free ((char *) name);	if (pass != orig_pass)	  free ((char *) pass);	if (read(s, &c, 1) != 1) {		perror(*ahost);		goto bad;	}	if (c != 0) {		while (read(s, &c, 1) == 1) {			(void) write(2, &c, 1);			if (c == '\n')				break;		}		goto bad;	}	freeaddrinfo(res0);	return (s);bad:	if (port)		(void) close(*fd2p);	(void) close(s);	freeaddrinfo(res0);	return (-1);}intrexec(ahost, rport, name, pass, cmd, fd2p)	char **ahost;	int rport;	const char *name, *pass, *cmd;	int *fd2p;{	return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);}