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/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <alloca.h>
#include <stdio.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
int rexecoptions;
int
rexec(ahost, rport, name, pass, cmd, fd2p)
char **ahost;
int rport;
char *name, *pass, *cmd;
int *fd2p;
{
struct sockaddr_in sin, sin2, from;
struct hostent hostbuf, *hp;
size_t hstbuflen;
char *hsttmpbuf;
u_short port;
int s, timo = 1, s3;
char c;
int herr;
hstbuflen = 1024;
hsttmpbuf = __alloca (hstbuflen);
while (__gethostbyname_r (*ahost, &hostbuf, hsttmpbuf, hstbuflen,
&hp, &herr) < 0)
if (herr != NETDB_INTERNAL || errno != ERANGE)
{
herror(*ahost);
return -1;
}
else
{
/* Enlarge the buffer. */
hstbuflen *= 2;
hsttmpbuf = __alloca (hstbuflen);
}
*ahost = hp->h_name;
ruserpass(hp->h_name, &name, &pass);
retry:
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0) {
perror("rexec: socket");
return (-1);
}
sin.sin_family = hp->h_addrtype;
sin.sin_port = rport;
bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
if (errno == ECONNREFUSED && timo <= 16) {
(void) close(s);
sleep(timo);
timo *= 2;
goto retry;
}
perror(hp->h_name);
return (-1);
}
if (fd2p == 0) {
(void) write(s, "", 1);
port = 0;
} else {
char num[32];
int s2, sin2len;
s2 = socket(AF_INET, SOCK_STREAM, 0);
if (s2 < 0) {
(void) close(s);
return (-1);
}
listen(s2, 1);
sin2len = sizeof (sin2);
if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
sin2len != sizeof (sin2)) {
perror("getsockname");
(void) close(s2);
goto bad;
}
port = ntohs((u_short)sin2.sin_port);
(void) sprintf(num, "%u", port);
(void) write(s, num, strlen(num)+1);
{ int len = sizeof (from);
s3 = accept(s2, (struct sockaddr *)&from, &len);
close(s2);
if (s3 < 0) {
perror("accept");
port = 0;
goto bad;
}
}
*fd2p = s3;
}
(void) write(s, name, strlen(name) + 1);
/* should public key encypt the password here */
(void) write(s, pass, strlen(pass) + 1);
(void) write(s, cmd, strlen(cmd) + 1);
if (read(s, &c, 1) != 1) {
perror(*ahost);
goto bad;
}
if (c != 0) {
while (read(s, &c, 1) == 1) {
(void) write(2, &c, 1);
if (c == '\n')
break;
}
goto bad;
}
return (s);
bad:
if (port)
(void) close(*fd2p);
(void) close(s);
return (-1);
}
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