134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
|
|
* The Qubes OS Project, http://www.qubes-os.org
|
|
*
|
|
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#include "libvchan.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
int libvchan_write_all(struct libvchan *ctrl, char *buf, int size)
|
|
{
|
|
int written = 0;
|
|
int ret;
|
|
while (written < size) {
|
|
ret = libvchan_write(ctrl, buf + written, size - written);
|
|
if (ret <= 0) {
|
|
perror("write");
|
|
exit(1);
|
|
}
|
|
written += ret;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
int write_all(int fd, char *buf, int size)
|
|
{
|
|
int written = 0;
|
|
int ret;
|
|
while (written < size) {
|
|
ret = write(fd, buf + written, size - written);
|
|
if (ret <= 0) {
|
|
perror("write");
|
|
exit(1);
|
|
}
|
|
written += ret;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
|
|
void usage()
|
|
{
|
|
fprintf(stderr, "usage:\n\tnode-select server nodeid\n"
|
|
"or\n" "\tnode-select client domainid nodeid\n");
|
|
exit(1);
|
|
}
|
|
|
|
#define BUFSIZE 5000
|
|
char buf[BUFSIZE];
|
|
|
|
/**
|
|
Simple libvchan application, both client and server.
|
|
Both sides may write and read, both from the libvchan and from
|
|
stdin/stdout (just like netcat). More code is required to avoid
|
|
deadlock when both sides write, and noone reads.
|
|
*/
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int ret;
|
|
int libvchan_fd;
|
|
struct libvchan *ctrl = 0;
|
|
if (argc < 3)
|
|
usage();
|
|
if (!strcmp(argv[1], "server"))
|
|
ctrl = libvchan_server_init(atoi(argv[2]));
|
|
else if (!strcmp(argv[1], "client"))
|
|
ctrl = libvchan_client_init(atoi(argv[2]), atoi(argv[3]));
|
|
else
|
|
usage();
|
|
if (!ctrl) {
|
|
perror("libvchan_*_init");
|
|
exit(1);
|
|
}
|
|
|
|
libvchan_fd = libvchan_fd_for_select(ctrl);
|
|
for (;;) {
|
|
fd_set rfds;
|
|
FD_ZERO(&rfds);
|
|
FD_SET(0, &rfds);
|
|
FD_SET(libvchan_fd, &rfds);
|
|
// libvchan_prepare_to_select(ctrl);
|
|
ret = select(libvchan_fd + 1, &rfds, NULL, NULL, NULL);
|
|
if (ret < 0) {
|
|
perror("select");
|
|
exit(1);
|
|
}
|
|
if (libvchan_is_eof(ctrl))
|
|
exit(0);
|
|
if (FD_ISSET(libvchan_fd, &rfds))
|
|
// we don't care about the result, but we need to do the read to
|
|
// clear libvchan_fd pendind state
|
|
libvchan_wait(ctrl);
|
|
while (libvchan_data_ready(ctrl) > 0) {
|
|
ret = libvchan_read(ctrl, buf, BUFSIZE);
|
|
if (ret < 0)
|
|
exit(0);
|
|
write_all(1, buf, ret);
|
|
}
|
|
if (FD_ISSET(0, &rfds)) {
|
|
ret = read(0, buf, BUFSIZE);
|
|
if (ret == 0) {
|
|
libvchan_close(ctrl);
|
|
exit(0);
|
|
}
|
|
if (ret < 0) {
|
|
perror("read 0");
|
|
exit(1);
|
|
}
|
|
// libvchan_write_all can block; so if both sides write a lot,
|
|
// we can deadlock. Need higher level solution; would libvchan_write be ok ?
|
|
libvchan_write_all(ctrl, buf, ret);
|
|
}
|
|
|
|
}
|
|
}
|