148 lines
3.3 KiB
C
Executable File
148 lines
3.3 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)rexec.c 1.9 94/01/27 SMI" /* SVr4.0 1.2 */
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/*
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* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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* PROPRIETARY NOTICE (Combined)
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*
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* This source code is unpublished proprietary information
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* constituting, or derived under license from AT&T's UNIX(r) System V.
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* In addition, portions of such source code were derived from Berkeley
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* 4.3 BSD under license from the Regents of the University of
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* California.
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*
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*
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*
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* Copyright Notice
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*
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* Notice of copyright on this source code product does not indicate
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* publication.
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*
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* (c) 1986,1987,1988.1989 Sun Microsystems, Inc
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* (c) 1983,1984,1985,1986,1987,1988,1989 AT&T.
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* All rights reserved.
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*
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <netdb.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#ifndef SYSV
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char *sprintf();
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#else
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#define bcopy(a, b, c) (void) memcpy((b), (a), (c))
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#endif
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void _ruserpass(const char *host, char **aname, char **apass);
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int rexec(char **ahost, unsigned short rport, const char *name,
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const char *pass, const char *cmd, int *fd2p)
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{
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int s, timo = 1, s3;
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struct sockaddr_in sin, sin2, from;
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char c;
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u_short port;
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struct hostent *hp;
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hp = gethostbyname(*ahost);
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if (hp == 0) {
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(void) fprintf(stderr, "%s: unknown host\n", *ahost);
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return (-1);
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}
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*ahost = hp->h_name;
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_ruserpass(hp->h_name, (char **)&name, (char **)&pass);
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retry:
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s = socket(AF_INET, SOCK_STREAM, 0);
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if (s < 0) {
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perror("rexec: socket");
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return (-1);
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}
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sin.sin_family = hp->h_addrtype;
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sin.sin_port = rport;
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bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
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if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
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if (errno == ECONNREFUSED && timo <= 16) {
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(void) close(s);
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(void) sleep(timo);
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timo *= 2;
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goto retry;
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}
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perror(hp->h_name);
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(void) close(s);
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return (-1);
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}
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if (fd2p == 0) {
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(void) write(s, "", 1);
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port = 0;
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} else {
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char num[8];
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int s2, sin2len;
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s2 = socket(AF_INET, SOCK_STREAM, 0);
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if (s2 < 0) {
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(void) close(s);
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return (-1);
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}
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(void) listen(s2, 1);
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sin2len = sizeof (sin2);
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if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
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sin2len != sizeof (sin2)) {
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perror("getsockname");
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(void) close(s2);
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goto bad;
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}
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port = ntohs((u_short)sin2.sin_port);
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(void) sprintf(num, "%u", port);
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(void) write(s, num, strlen(num)+1);
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{
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int len = sizeof (from);
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s3 = accept(s2, (struct sockaddr *)&from, &len);
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(void) close(s2);
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if (s3 < 0) {
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perror("accept");
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port = 0;
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goto bad;
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}
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}
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*fd2p = s3;
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}
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(void) write(s, name, strlen(name) + 1);
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/* should public key encypt the password here */
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(void) write(s, pass, strlen(pass) + 1);
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(void) write(s, cmd, strlen(cmd) + 1);
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if (read(s, &c, 1) != 1) {
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perror(*ahost);
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goto bad;
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}
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if (c != 0) {
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while (read(s, &c, 1) == 1) {
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(void) write(2, &c, 1);
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if (c == '\n')
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break;
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}
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goto bad;
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}
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return (s);
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bad:
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if (port)
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(void) close(*fd2p);
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(void) close(s);
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return (-1);
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}
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