1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/**
* @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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* @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>
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;
void vchan_wr() {
if (!insiz)
return;
int 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);
}
}
void stdout_wr() {
if (!outsiz)
return;
int ret = write(1, outbuf, outsiz);
if (ret < 0 && errno != EAGAIN)
exit(1);
if (ret > 0) {
outsiz -= ret;
memmove(outbuf, outbuf + ret, outsiz);
}
}
/**
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);
}
fcntl(0, F_SETFL, O_NONBLOCK);
fcntl(1, F_SETFL, O_NONBLOCK);
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)) {
fcntl(1, F_SETFL, 0);
while (outsiz)
stdout_wr();
return 0;
}
}
}
|
