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 #include <sys/cdefs.h> 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93"; 38 #else 39 __RCSID("$NetBSD: rexec.c,v 1.8 1998/08/10 02:44:04 perry Exp $"); 40 #endif 41 #endif /* LIBC_SCCS and not lint */ 42 43 #include <sys/types.h> 44 #include <sys/socket.h> 45 46 #include <netinet/in.h> 47 48 #include <stdio.h> 49 #include <netdb.h> 50 #include <string.h> 51 #include <errno.h> 52 #include <unistd.h> 53 54 int rexecoptions; 55 56 int ruserpass __P((const char *, char **, char **)); 57 int rexec __P((char **, int, char *, char *, char *, int *)); 58 59 int 60 rexec(ahost, rport, name, pass, cmd, fd2p) 61 char **ahost; 62 int rport; 63 char *name, *pass, *cmd; 64 int *fd2p; 65 { 66 struct sockaddr_in sin, sin2, from; 67 struct hostent *hp; 68 u_short port; 69 int s, timo = 1, s3; 70 char c; 71 72 hp = gethostbyname(*ahost); 73 if (hp == 0) { 74 herror(*ahost); 75 return (-1); 76 } 77 *ahost = hp->h_name; 78 (void)ruserpass(hp->h_name, &name, &pass); 79 retry: 80 s = socket(AF_INET, SOCK_STREAM, 0); 81 if (s < 0) { 82 perror("rexec: socket"); 83 return (-1); 84 } 85 sin.sin_family = hp->h_addrtype; 86 sin.sin_len = sizeof(sin); 87 sin.sin_port = rport; 88 memcpy((caddr_t)&sin.sin_addr, hp->h_addr, hp->h_length); 89 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 90 if (errno == ECONNREFUSED && timo <= 16) { 91 (void) close(s); 92 sleep(timo); 93 timo *= 2; 94 goto retry; 95 } 96 perror(hp->h_name); 97 return (-1); 98 } 99 port = 0; 100 if (fd2p == 0) { 101 (void) write(s, "", 1); 102 } else { 103 char num[8]; 104 int s2, sin2len; 105 106 s2 = socket(AF_INET, SOCK_STREAM, 0); 107 if (s2 < 0) { 108 (void) close(s); 109 return (-1); 110 } 111 listen(s2, 1); 112 sin2len = sizeof (sin2); 113 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 || 114 sin2len != sizeof (sin2)) { 115 perror("getsockname"); 116 (void) close(s2); 117 goto bad; 118 } 119 port = ntohs((u_short)sin2.sin_port); 120 (void)snprintf(num, sizeof num, "%u", port); 121 (void) write(s, num, strlen(num)+1); 122 { int len = sizeof (from); 123 s3 = accept(s2, (struct sockaddr *)&from, &len); 124 close(s2); 125 if (s3 < 0) { 126 perror("accept"); 127 port = 0; 128 goto bad; 129 } 130 } 131 *fd2p = s3; 132 } 133 (void) write(s, name, strlen(name) + 1); 134 /* should public key encypt the password here */ 135 (void) write(s, pass, strlen(pass) + 1); 136 (void) write(s, cmd, strlen(cmd) + 1); 137 if (read(s, &c, 1) != 1) { 138 perror(*ahost); 139 goto bad; 140 } 141 if (c != 0) { 142 while (read(s, &c, 1) == 1) { 143 (void) write(2, &c, 1); 144 if (c == '\n') 145 break; 146 } 147 goto bad; 148 } 149 return (s); 150 bad: 151 if (port) 152 (void) close(*fd2p); 153 (void) close(s); 154 return (-1); 155 } 156