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) sprintf(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