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/**
* @file
* @section AUTHORS
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* Authors:
* Rafal Wojtczuk <rafal@invisiblethingslab.com>
* Daniel De Graaf <dgdegra@tycho.nsa.gov>
*
* @section LICENSE
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; If not, see <http://www.gnu.org/licenses/>.
*
* @section DESCRIPTION
*
* This is a test program for libxenvchan. Communications are bidirectional,
* with either server (grant offeror) or client able to read and write.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <libxenvchan.h>
static void usage(char** argv)
{
fprintf(stderr, "usage:\n"
"\t%s [client|server] domainid nodepath [rbufsiz wbufsiz]\n",
argv[0]);
exit(1);
}
#define BUFSIZE 5000
char inbuf[BUFSIZE];
char outbuf[BUFSIZE];
int insiz = 0;
int outsiz = 0;
struct libxenvchan *ctrl = 0;
static void vchan_wr(void) {
int ret;
if (!insiz)
return;
ret = libxenvchan_write(ctrl, inbuf, insiz);
if (ret < 0) {
fprintf(stderr, "vchan write failed\n");
exit(1);
}
if (ret > 0) {
insiz -= ret;
memmove(inbuf, inbuf + ret, insiz);
}
}
static void stdout_wr(void) {
int ret;
if (!outsiz)
return;
ret = write(1, outbuf, outsiz);
if (ret < 0 && errno != EAGAIN)
exit(1);
if (ret > 0) {
outsiz -= ret;
memmove(outbuf, outbuf + ret, outsiz);
}
}
static int set_nonblocking(int fd, int nonblocking) {
int flags = fcntl(fd, F_GETFL);
if (flags == -1)
return -1;
if (nonblocking)
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) == -1)
return -1;
return 0;
}
/**
Simple libxenvchan application, both client and server.
Both sides may write and read, both from the libxenvchan and from
stdin/stdout (just like netcat).
*/
int main(int argc, char **argv)
{
int ret;
int libxenvchan_fd;
if (argc < 4 || argv[3][0] != '/')
usage(argv);
if (!strcmp(argv[1], "server")) {
int rsiz = argc > 4 ? atoi(argv[4]) : 0;
int wsiz = argc > 5 ? atoi(argv[5]) : 0;
ctrl = libxenvchan_server_init(NULL, atoi(argv[2]), argv[3], rsiz, wsiz);
} else if (!strcmp(argv[1], "client"))
ctrl = libxenvchan_client_init(NULL, atoi(argv[2]), argv[3]);
else
usage(argv);
if (!ctrl) {
perror("libxenvchan_*_init");
exit(1);
}
if (set_nonblocking(0, 1) || set_nonblocking(1, 1)) {
perror("set_nonblocking");
exit(1);
}
libxenvchan_fd = libxenvchan_fd_for_select(ctrl);
for (;;) {
fd_set rfds;
fd_set wfds;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
if (insiz != BUFSIZE)
FD_SET(0, &rfds);
if (outsiz)
FD_SET(1, &wfds);
FD_SET(libxenvchan_fd, &rfds);
ret = select(libxenvchan_fd + 1, &rfds, &wfds, NULL, NULL);
if (ret < 0) {
perror("select");
exit(1);
}
if (FD_ISSET(0, &rfds)) {
ret = read(0, inbuf + insiz, BUFSIZE - insiz);
if (ret < 0 && errno != EAGAIN)
exit(1);
if (ret == 0) {
while (insiz) {
vchan_wr();
libxenvchan_wait(ctrl);
}
return 0;
}
if (ret)
insiz += ret;
vchan_wr();
}
if (FD_ISSET(libxenvchan_fd, &rfds)) {
libxenvchan_wait(ctrl);
vchan_wr();
}
if (FD_ISSET(1, &wfds))
stdout_wr();
while (libxenvchan_data_ready(ctrl) && outsiz < BUFSIZE) {
ret = libxenvchan_read(ctrl, outbuf + outsiz, BUFSIZE - outsiz);
if (ret < 0)
exit(1);
outsiz += ret;
stdout_wr();
}
if (!libxenvchan_is_open(ctrl)) {
if (set_nonblocking(1, 0)) {
perror("set_nonblocking");
exit(1);
}
while (outsiz)
stdout_wr();
return 0;
}
}
}
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