usr/src/lib/libsocket/inet/rexec.c

   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 }