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rexec.c revision 1.5 
      1 /*
      2  * Copyright (c) 1980, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 static char sccsid[] = "@(#)rexec.c	8.1 (Berkeley) 6/4/93";
     36 #endif /* LIBC_SCCS and not lint */
     37 
     38 #include <sys/types.h>
     39 #include <sys/socket.h>
     40 
     41 #include <netinet/in.h>
     42 
     43 #include <stdio.h>
     44 #include <netdb.h>
     45 #include <string.h>
     46 #include <errno.h>
     47 #include <unistd.h>
     48 
     49 int	rexecoptions;
     50 
     51 void ruserpass __P((const char *, char **, char **));
     52 
     53 int
     54 rexec(ahost, rport, name, pass, cmd, fd2p)
     55 	char **ahost;
     56 	int rport;
     57 	char *name, *pass, *cmd;
     58 	int *fd2p;
     59 {
     60 	struct sockaddr_in sin, sin2, from;
     61 	struct hostent *hp;
     62 	u_short port;
     63 	int s, timo = 1, s3;
     64 	char c;
     65 
     66 	hp = gethostbyname(*ahost);
     67 	if (hp == 0) {
     68 		herror(*ahost);
     69 		return (-1);
     70 	}
     71 	*ahost = hp->h_name;
     72 	ruserpass(hp->h_name, &name, &pass);
     73 retry:
     74 	s = socket(AF_INET, SOCK_STREAM, 0);
     75 	if (s < 0) {
     76 		perror("rexec: socket");
     77 		return (-1);
     78 	}
     79 	sin.sin_family = hp->h_addrtype;
     80 	sin.sin_len = sizeof(sin);
     81 	sin.sin_port = rport;
     82 	bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
     83 	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
     84 		if (errno == ECONNREFUSED && timo <= 16) {
     85 			(void) close(s);
     86 			sleep(timo);
     87 			timo *= 2;
     88 			goto retry;
     89 		}
     90 		perror(hp->h_name);
     91 		return (-1);
     92 	}
     93 	port = 0;
     94 	if (fd2p == 0) {
     95 		(void) write(s, "", 1);
     96 	} else {
     97 		char num[8];
     98 		int s2, sin2len;
     99 
    100 		s2 = socket(AF_INET, SOCK_STREAM, 0);
    101 		if (s2 < 0) {
    102 			(void) close(s);
    103 			return (-1);
    104 		}
    105 		listen(s2, 1);
    106 		sin2len = sizeof (sin2);
    107 		if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
    108 		  sin2len != sizeof (sin2)) {
    109 			perror("getsockname");
    110 			(void) close(s2);
    111 			goto bad;
    112 		}
    113 		port = ntohs((u_short)sin2.sin_port);
    114 		(void)snprintf(num, sizeof num, "%u", port);
    115 		(void) write(s, num, strlen(num)+1);
    116 		{ int len = sizeof (from);
    117 		  s3 = accept(s2, (struct sockaddr *)&from, &len);
    118 		  close(s2);
    119 		  if (s3 < 0) {
    120 			perror("accept");
    121 			port = 0;
    122 			goto bad;
    123 		  }
    124 		}
    125 		*fd2p = s3;
    126 	}
    127 	(void) write(s, name, strlen(name) + 1);
    128 	/* should public key encypt the password here */
    129 	(void) write(s, pass, strlen(pass) + 1);
    130 	(void) write(s, cmd, strlen(cmd) + 1);
    131 	if (read(s, &c, 1) != 1) {
    132 		perror(*ahost);
    133 		goto bad;
    134 	}
    135 	if (c != 0) {
    136 		while (read(s, &c, 1) == 1) {
    137 			(void) write(2, &c, 1);
    138 			if (c == '\n')
    139 				break;
    140 		}
    141 		goto bad;
    142 	}
    143 	return (s);
    144 bad:
    145 	if (port)
    146 		(void) close(*fd2p);
    147 	(void) close(s);
    148 	return (-1);
    149 }
    150