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 <errno.h> 46 47 extern errno; 48 char *index(); 49 int rexecoptions; 50 char *getpass(), *getlogin(); 51 52 rexec(ahost, rport, name, pass, cmd, fd2p) 53 char **ahost; 54 int rport; 55 char *name, *pass, *cmd; 56 int *fd2p; 57 { 58 struct sockaddr_in sin, sin2, from; 59 struct hostent *hp; 60 u_short port; 61 int s, timo = 1, s3; 62 char c; 63 64 hp = gethostbyname(*ahost); 65 if (hp == 0) { 66 herror(*ahost); 67 return (-1); 68 } 69 *ahost = hp->h_name; 70 ruserpass(hp->h_name, &name, &pass); 71 retry: 72 s = socket(AF_INET, SOCK_STREAM, 0); 73 if (s < 0) { 74 perror("rexec: socket"); 75 return (-1); 76 } 77 sin.sin_family = hp->h_addrtype; 78 sin.sin_port = rport; 79 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 80 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 81 if (errno == ECONNREFUSED && timo <= 16) { 82 (void) close(s); 83 sleep(timo); 84 timo *= 2; 85 goto retry; 86 } 87 perror(hp->h_name); 88 return (-1); 89 } 90 if (fd2p == 0) { 91 (void) write(s, "", 1); 92 port = 0; 93 } else { 94 char num[8]; 95 int s2, sin2len; 96 97 s2 = socket(AF_INET, SOCK_STREAM, 0); 98 if (s2 < 0) { 99 (void) close(s); 100 return (-1); 101 } 102 listen(s2, 1); 103 sin2len = sizeof (sin2); 104 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 || 105 sin2len != sizeof (sin2)) { 106 perror("getsockname"); 107 (void) close(s2); 108 goto bad; 109 } 110 port = ntohs((u_short)sin2.sin_port); 111 (void) sprintf(num, "%u", port); 112 (void) write(s, num, strlen(num)+1); 113 { int len = sizeof (from); 114 s3 = accept(s2, (struct sockaddr *)&from, &len); 115 close(s2); 116 if (s3 < 0) { 117 perror("accept"); 118 port = 0; 119 goto bad; 120 } 121 } 122 *fd2p = s3; 123 } 124 (void) write(s, name, strlen(name) + 1); 125 /* should public key encypt the password here */ 126 (void) write(s, pass, strlen(pass) + 1); 127 (void) write(s, cmd, strlen(cmd) + 1); 128 if (read(s, &c, 1) != 1) { 129 perror(*ahost); 130 goto bad; 131 } 132 if (c != 0) { 133 while (read(s, &c, 1) == 1) { 134 (void) write(2, &c, 1); 135 if (c == '\n') 136 break; 137 } 138 goto bad; 139 } 140 return (s); 141 bad: 142 if (port) 143 (void) close(*fd2p); 144 (void) close(s); 145 return (-1); 146 } 147