1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 45 #include <netinet/in.h> 46 47 #include <stdio.h> 48 #include <netdb.h> 49 #include <errno.h> 50 #include <unistd.h> 51 #include <string.h> 52 #include <stdlib.h> 53 #include <libintl.h> 54 55 #ifdef SYSV 56 #define bcopy(a, b, c) (void) memcpy((b), (a), (c)) 57 #endif 58 59 #define MAX_SHORTSTRLEN 6 60 61 void _ruserpass(const char *host, char **aname, char **apass); 62 63 int rexec(char **ahost, unsigned short rport, const char *name, 64 const char *pass, const char *cmd, int *fd2p) 65 { 66 return (rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET)); 67 } 68 69 int rexec_af(char **ahost, unsigned short rport, const char *name, 70 const char *pass, const char *cmd, int *fd2p, int af) 71 { 72 int s, timo = 1, s3; 73 char c; 74 ushort_t port; 75 static char hostname[MAXHOSTNAMELEN]; 76 int rc; 77 struct addrinfo *res; 78 struct addrinfo hints; 79 char aport[MAX_SHORTSTRLEN]; 80 81 if (!(af == AF_INET || af == AF_INET6 || af == AF_UNSPEC)) { 82 (void) fprintf(stderr, 83 dgettext(TEXT_DOMAIN, "%d: Address family not " 84 "supported\n"), af); 85 errno = EAFNOSUPPORT; 86 return (-1); 87 } 88 memset(&hints, 0, sizeof (hints)); 89 (void) snprintf(aport, MAX_SHORTSTRLEN, "%u", ntohs(rport)); 90 hints.ai_flags = AI_CANONNAME|AI_ADDRCONFIG|AI_V4MAPPED; 91 hints.ai_socktype = SOCK_STREAM; 92 hints.ai_family = af; 93 rc = getaddrinfo(*ahost, aport, &hints, &res); 94 95 if (rc != 0) { 96 (void) fprintf(stderr, 97 dgettext(TEXT_DOMAIN, "%s: unknown host\n"), 98 *ahost); 99 return (-1); 100 } 101 (void) strlcpy(hostname, res->ai_canonname, MAXHOSTNAMELEN); 102 *ahost = hostname; 103 _ruserpass(res->ai_canonname, (char **)&name, (char **)&pass); 104 retry: 105 s = socket(res->ai_addr->sa_family, res->ai_socktype, res->ai_protocol); 106 if (s < 0) { 107 perror("rexec: socket"); 108 freeaddrinfo(res); 109 return (-1); 110 } 111 if (connect(s, res->ai_addr, res->ai_addrlen) != 0) { 112 if (errno == ECONNREFUSED && timo <= 16) { 113 (void) close(s); 114 (void) sleep(timo); 115 timo *= 2; 116 goto retry; 117 } 118 perror(*ahost); 119 (void) close(s); 120 freeaddrinfo(res); 121 return (-1); 122 } 123 if (fd2p == 0) { 124 (void) write(s, "", 1); 125 port = 0; 126 } else { 127 int s2; 128 socklen_t sin2len; 129 struct sockaddr_storage sin2, from; 130 131 s2 = socket(res->ai_family, SOCK_STREAM, 0); 132 if (s2 < 0) { 133 (void) close(s); 134 freeaddrinfo(res); 135 return (-1); 136 } 137 (void) listen(s2, 1); 138 sin2len = (socklen_t)sizeof (sin2); 139 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0) { 140 perror("getsockname"); 141 (void) close(s2); 142 goto bad; 143 } 144 if (res->ai_family == AF_INET6) { 145 port = ntohs(((struct sockaddr_in6 *)&sin2)->sin6_port); 146 } else { 147 port = ntohs(((struct sockaddr_in *)&sin2)->sin_port); 148 } 149 (void) snprintf(aport, MAX_SHORTSTRLEN, "%u", port); 150 (void) write(s, aport, strlen(aport)+1); 151 { 152 socklen_t len = (socklen_t)sizeof (from); 153 s3 = accept(s2, (struct sockaddr *)&from, &len); 154 (void) close(s2); 155 if (s3 < 0) { 156 perror("accept"); 157 port = 0; 158 goto bad; 159 } 160 } 161 *fd2p = s3; 162 } 163 (void) write(s, name, strlen(name) + 1); 164 /* should public key encypt the password here */ 165 (void) write(s, pass, strlen(pass) + 1); 166 (void) write(s, cmd, strlen(cmd) + 1); 167 if (read(s, &c, 1) != 1) { 168 perror(*ahost); 169 goto bad; 170 } 171 if (c != 0) { 172 while (read(s, &c, 1) == 1) { 173 (void) write(2, &c, 1); 174 if (c == '\n') 175 break; 176 } 177 goto bad; 178 } 179 freeaddrinfo(res); 180 return (s); 181 bad: 182 if (port) 183 (void) close(*fd2p); 184 (void) close(s); 185 freeaddrinfo(res); 186 return (-1); 187 } 188