home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
EnigmA Amiga Run 1996 June
/
EnigmA AMIGA RUN 08 (1996)(G.R. Edizioni)(IT)[!][issue 1996-06][EARSAN CD VII].iso
/
earcd
/
gcc
/
ixemlsrc.lha
/
ixemul
/
ixnet
/
rcmd.c
< prev
next >
Wrap
C/C++ Source or Header
|
1996-03-13
|
6KB
|
221 lines
/*
* Copyright (c) 1983 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[] = "@(#)rcmd.c 5.24 (Berkeley) 2/24/91";
#endif /* LIBC_SCCS and not lint */
#define KERNEL
#include "ixnet.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "ixprotos.h"
int rcmd(char **ahost, int rport, const char *locuser, const char *remuser,
const char *cmd, int *fd2p) {
int s, timo = 1, pid;
long oldmask;
struct sockaddr_in sin, from;
char c;
int lport = IPPORT_RESERVED - 1;
struct hostent *hp;
fd_set reads;
pid = getpid();
hp = gethostbyname(*ahost);
if (hp == 0) {
herror(*ahost);
return (-1);
}
*ahost = hp->h_name;
oldmask = sigblock(sigmask(SIGURG));
for (;;) {
s = rresvport(&lport);
if (s < 0) {
if (errno == EAGAIN)
fprintf(stderr, "socket: All ports in use\n");
else
perror("rcmd: socket");
sigsetmask(oldmask);
return (-1);
}
#ifdef F_SETOWN
fcntl(s, F_SETOWN, pid);
#endif
sin.sin_family = hp->h_addrtype;
bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
sin.sin_port = rport;
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
break;
(void) close(s);
if (errno == EADDRINUSE) {
lport--;
continue;
}
if (errno == ECONNREFUSED && timo <= 16) {
sleep(timo);
timo *= 2;
continue;
}
if (hp->h_addr_list[1] != NULL) {
int oerrno = errno;
fprintf(stderr, "connect to address %s: ",
inet_ntoa(sin.sin_addr));
errno = oerrno;
perror(0);
hp->h_addr_list++;
bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
fprintf(stderr, "Trying %s...\n", inet_ntoa(sin.sin_addr));
continue;
}
perror(hp->h_name);
sigsetmask(oldmask);
return (-1);
}
lport--;
if (fd2p == 0) {
write(s, "", 1);
lport = 0;
}
else {
char num[8];
int s2 = rresvport(&lport), s3;
int len = sizeof (from);
if (s2 < 0)
goto bad;
listen(s2, 1);
(void) sprintf(num, "%d", lport);
if (write(s, num, strlen(num)+1) != strlen(num)+1) {
perror("write: setting up stderr");
(void) close(s2);
goto bad;
}
FD_ZERO(&reads);
FD_SET(s, &reads);
FD_SET(s2, &reads);
errno = 0;
if (select(32, &reads, 0, 0, 0) < 1 ||
!FD_ISSET(s2, &reads)) {
if (errno != 0)
perror("select: setting up stderr");
else
fprintf(stderr, "select: protocol failure in circuit setup.\n");
(void) close(s2);
goto bad;
}
s3 = accept(s2, (struct sockaddr *)&from, &len);
(void) close(s2);
if (s3 < 0) {
perror("accept");
lport = 0;
goto bad;
}
*fd2p = s3;
from.sin_port = ntohs((u_short)from.sin_port);
if (from.sin_family != AF_INET ||
from.sin_port >= IPPORT_RESERVED ||
from.sin_port < IPPORT_RESERVED / 2) {
fprintf(stderr, "socket: protocol failure in circuit setup.\n");
goto bad2;
}
}
(void) write(s, locuser, strlen(locuser)+1);
(void) write(s, remuser, strlen(remuser)+1);
(void) write(s, cmd, strlen(cmd)+1);
if (read(s, &c, 1) != 1) {
perror(*ahost);
goto bad2;
}
if (c != 0) {
while (read(s, &c, 1) == 1) {
(void) write(2, &c, 1);
if (c == '\n')
break;
}
goto bad2;
}
sigsetmask(oldmask);
return (s);
bad2:
if (lport)
(void) close(*fd2p);
bad:
(void)close(s);
sigsetmask(oldmask);
return (-1);
}
int
rresvport(int *alport) {
struct sockaddr_in sin;
int s;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return (-1);
for (;;) {
sin.sin_port = htons((u_short)*alport);
if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
return (s);
if (errno != EADDRINUSE) {
(void) close(s);
return (-1);
}
(*alport)--;
if (*alport == IPPORT_RESERVED/2) {
(void) close(s);
errno = EAGAIN; /* close */
return (-1);
}
}
}