149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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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 <string.h>
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#include <errno.h>
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extern errno;
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char *index();
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int rexecoptions;
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char *getpass(), *getlogin();
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rexec(ahost, rport, name, pass, cmd, fd2p)
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char **ahost;
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int rport;
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char *name, *pass, *cmd;
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int *fd2p;
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{
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struct sockaddr_in sin, sin2, from;
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struct hostent *hp;
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u_short port;
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int s, timo = 1, s3;
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char c;
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hp = gethostbyname(*ahost);
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if (hp == 0) {
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herror(*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, &name, &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_len = sizeof(sin);
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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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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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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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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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{ int len = sizeof (from);
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s3 = accept(s2, (struct sockaddr *)&from, &len);
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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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