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 48 extern errno; 49 char *index(); 50 int rexecoptions; 51 char *getpass(), *getlogin(); 52 53 rexec(ahost, rport, name, pass, cmd, fd2p) 54 char **ahost; 55 int rport; 56 char *name, *pass, *cmd; 57 int *fd2p; 58 { 59 struct sockaddr_in sin, sin2, from; 60 struct hostent *hp; 61 u_short port; 62 int s, timo = 1, s3; 63 char c; 64 65 hp = gethostbyname(*ahost); 66 if (hp == 0) { 67 herror(*ahost); 68 return (-1); 69 } 70 *ahost = hp->h_name; 71 ruserpass(hp->h_name, &name, &pass); 72 retry: 73 s = socket(AF_INET, SOCK_STREAM, 0); 74 if (s < 0) { 75 perror("rexec: socket"); 76 return (-1); 77 } 78 sin.sin_family = hp->h_addrtype; 79 sin.sin_port = rport; 80 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length); 81 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 82 if (errno == ECONNREFUSED && timo <= 16) { 83 (void) close(s); 84 sleep(timo); 85 timo *= 2; 86 goto retry; 87 } 88 perror(hp->h_name); 89 return (-1); 90 } 91 if (fd2p == 0) { 92 (void) write(s, "", 1); 93 port = 0; 94 } else { 95 char num[8]; 96 int s2, sin2len; 97 98 s2 = socket(AF_INET, SOCK_STREAM, 0); 99 if (s2 < 0) { 100 (void) close(s); 101 return (-1); 102 } 103 listen(s2, 1); 104 sin2len = sizeof (sin2); 105 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 || 106 sin2len != sizeof (sin2)) { 107 perror("getsockname"); 108 (void) close(s2); 109 goto bad; 110 } 111 port = ntohs((u_short)sin2.sin_port); 112 (void) sprintf(num, "%u", port); 113 (void) write(s, num, strlen(num)+1); 114 { int len = sizeof (from); 115 s3 = accept(s2, (struct sockaddr *)&from, &len); 116 close(s2); 117 if (s3 < 0) { 118 perror("accept"); 119 port = 0; 120 goto bad; 121 } 122 } 123 *fd2p = s3; 124 } 125 (void) write(s, name, strlen(name) + 1); 126 /* should public key encypt the password here */ 127 (void) write(s, pass, strlen(pass) + 1); 128 (void) write(s, cmd, strlen(cmd) + 1); 129 if (read(s, &c, 1) != 1) { 130 perror(*ahost); 131 goto bad; 132 } 133 if (c != 0) { 134 while (read(s, &c, 1) == 1) { 135 (void) write(2, &c, 1); 136 if (c == '\n') 137 break; 138 } 139 goto bad; 140 } 141 return (s); 142 bad: 143 if (port) 144 (void) close(*fd2p); 145 (void) close(s); 146 return (-1); 147 } 148