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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/*
* Copyright (c) 2012 Ross Lagerwall <rosslagerwall@gmail.com>
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "event2/event-config.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#ifdef EVENT__HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef EVENT__HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef EVENT__HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include "event2/event.h"
#include "event2/bufferevent.h"
#include "event2/buffer.h"
#include "event2/listener.h"
/* Number of requests to make. Setting this too high might result in the machine
running out of ephemeral ports */
#ifdef _WIN32
#define MAX_REQUESTS 1000
#else
#define MAX_REQUESTS 4000
#endif
/* Provide storage for the address, both for the server & the clients */
static struct sockaddr_in saddr;
/* Number of sucessful requests so far */
static int num_requests;
static void start_client(struct event_base *base);
static void
my_perror(const char *s)
{
fprintf(stderr, "%s: %s",
s, evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR()));
}
/*
===============================================
Server functions
===============================================
*/
/* Read a byte from the client and write it back */
static void
server_read_cb(struct bufferevent *bev, void *ctx)
{
while (evbuffer_get_length(bufferevent_get_input(bev))) {
unsigned char tmp;
bufferevent_read(bev, &tmp, 1);
bufferevent_write(bev, &tmp, 1);
}
}
/* Wait for an EOF and then free the bufferevent */
static void
server_event_cb(struct bufferevent *bev, short events, void *ctx)
{
if (events & BEV_EVENT_ERROR) {
my_perror("Error from bufferevent");
exit(1);
} else if (events & BEV_EVENT_EOF) {
bufferevent_free(bev);
if (num_requests == MAX_REQUESTS) {
event_base_loopbreak(bufferevent_get_base(bev));
}
}
}
/* Accept a client socket and set it up to for reading & writing */
static void
listener_accept_cb(struct evconnlistener *listener, evutil_socket_t sock,
struct sockaddr *addr, int len, void *ptr)
{
struct event_base *base = evconnlistener_get_base(listener);
struct bufferevent *bev = bufferevent_socket_new(base, sock,
BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(bev, server_read_cb, NULL, server_event_cb, NULL);
bufferevent_enable(bev, EV_READ|EV_WRITE);
}
/* Start the server listening on a random port and start the first client. */
static void
start_loop(void)
{
struct event_base *base;
struct evconnlistener *listener;
struct sockaddr_storage ss;
ev_socklen_t socklen = sizeof(ss);
evutil_socket_t fd;
base = event_base_new();
if (base == NULL) {
puts("Could not open event base!");
exit(1);
}
listener = evconnlistener_new_bind(base, listener_accept_cb, NULL,
LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,
-1, (struct sockaddr *)&saddr, sizeof(saddr));
if (listener == NULL) {
my_perror("Could not create listener!");
exit(1);
}
fd = evconnlistener_get_fd(listener);
if (fd < 0) {
puts("Couldn't get fd from listener");
exit(1);
}
if (getsockname(fd, (struct sockaddr *)&ss, &socklen) < 0) {
my_perror("getsockname()");
exit(1);
}
memcpy(&saddr, &ss, sizeof(saddr));
if (saddr.sin_family != AF_INET) {
puts("AF mismatch from getsockname().");
exit(1);
}
start_client(base);
event_base_dispatch(base);
evconnlistener_free(listener);
event_base_free(base);
}
/*
===============================================
Client functions
===============================================
*/
/* Check that the server sends back the same byte that the client sent.
If MAX_REQUESTS have been reached, exit. Otherwise, start another client. */
static void
client_read_cb(struct bufferevent *bev, void *ctx)
{
unsigned char tmp;
struct event_base *base = bufferevent_get_base(bev);
bufferevent_read(bev, &tmp, 1);
if (tmp != 'A') {
puts("Incorrect data received!");
exit(2);
}
bufferevent_free(bev);
num_requests++;
if (++num_requests < MAX_REQUESTS) {
start_client(base);
}
}
/* Send a byte to the server. */
static void
client_event_cb(struct bufferevent *bev, short events, void *ctx)
{
if (events & BEV_EVENT_CONNECTED) {
unsigned char tmp = 'A';
bufferevent_write(bev, &tmp, 1);
} else if (events & BEV_EVENT_ERROR) {
puts("Client socket got error!");
exit(2);
}
bufferevent_enable(bev, EV_READ);
}
/* Open a client socket to connect to localhost on sin */
static void
start_client(struct event_base *base)
{
struct bufferevent *bev = bufferevent_socket_new(base, -1,
BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(bev, client_read_cb, NULL, client_event_cb, NULL);
if (bufferevent_socket_connect(bev, (struct sockaddr *)&saddr,
sizeof(saddr)) < 0) {
my_perror("Could not connect!");
bufferevent_free(bev);
exit(2);
}
}
int
main(int argc, char **argv)
{
#ifdef EVENT__HAVE_SETRLIMIT
/* Set the fd limit to a low value so that any fd leak is caught without
making many requests. */
struct rlimit rl;
rl.rlim_cur = rl.rlim_max = 20;
if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
my_perror("setrlimit");
exit(3);
}
#endif
#ifdef _WIN32
WSADATA WSAData;
WSAStartup(0x101, &WSAData);
#endif
/* Set up an address, used by both client & server. */
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = htonl(0x7f000001);
saddr.sin_port = 0; /* Tell the implementation to pick a port. */
start_loop();
return 0;
}
/* XXX why does this test cause so much latency sometimes (OSX 10.5)? */
|
