1 /*
2 * Copyright (c) 2012 Ross Lagerwall <rosslagerwall@gmail.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "event2/event-config.h"
28
29 #ifdef _WIN32
30 #define WIN32_LEAN_AND_MEAN
31 #include <windows.h>
32 #endif
33 #include <string.h>
34 #include <stdlib.h>
35 #include <errno.h>
36 #ifdef EVENT__HAVE_SYS_TIME_H
37 #include <sys/time.h>
38 #endif
39 #ifdef EVENT__HAVE_SYS_RESOURCE_H
40 #include <sys/resource.h>
41 #endif
42 #ifdef EVENT__HAVE_NETINET_IN_H
43 #include <netinet/in.h>
44 #endif
45
46 #include "event2/event.h"
47 #include "event2/bufferevent.h"
48 #include "event2/buffer.h"
49 #include "event2/listener.h"
50
51 /* Number of requests to make. Setting this too high might result in the machine
52 running out of ephemeral ports */
53 #ifdef _WIN32
54 #define MAX_REQUESTS 1000
55 #else
56 #define MAX_REQUESTS 4000
57 #endif
58
59 /* Provide storage for the address, both for the server & the clients */
60 static struct sockaddr_in saddr;
61
62 /* Number of sucessful requests so far */
63 static int num_requests;
64
65 static void start_client(struct event_base *base);
66
67 static void
my_perror(const char * s)68 my_perror(const char *s)
69 {
70 fprintf(stderr, "%s: %s",
71 s, evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR()));
72 }
73
74 /*
75 ===============================================
76 Server functions
77 ===============================================
78 */
79
80 /* Read a byte from the client and write it back */
81 static void
server_read_cb(struct bufferevent * bev,void * ctx)82 server_read_cb(struct bufferevent *bev, void *ctx)
83 {
84 while (evbuffer_get_length(bufferevent_get_input(bev))) {
85 unsigned char tmp;
86 bufferevent_read(bev, &tmp, 1);
87 bufferevent_write(bev, &tmp, 1);
88 }
89 }
90
91 /* Wait for an EOF and then free the bufferevent */
92 static void
server_event_cb(struct bufferevent * bev,short events,void * ctx)93 server_event_cb(struct bufferevent *bev, short events, void *ctx)
94 {
95 if (events & BEV_EVENT_ERROR) {
96 my_perror("Error from bufferevent");
97 exit(1);
98 } else if (events & BEV_EVENT_EOF) {
99 bufferevent_free(bev);
100 if (num_requests == MAX_REQUESTS) {
101 event_base_loopbreak(bufferevent_get_base(bev));
102 }
103 }
104 }
105
106 /* Accept a client socket and set it up to for reading & writing */
107 static void
listener_accept_cb(struct evconnlistener * listener,evutil_socket_t sock,struct sockaddr * addr,int len,void * ptr)108 listener_accept_cb(struct evconnlistener *listener, evutil_socket_t sock,
109 struct sockaddr *addr, int len, void *ptr)
110 {
111 struct event_base *base = evconnlistener_get_base(listener);
112 struct bufferevent *bev = bufferevent_socket_new(base, sock,
113 BEV_OPT_CLOSE_ON_FREE);
114 bufferevent_setcb(bev, server_read_cb, NULL, server_event_cb, NULL);
115 bufferevent_enable(bev, EV_READ|EV_WRITE);
116 }
117
118 /* Start the server listening on a random port and start the first client. */
119 static void
start_loop(void)120 start_loop(void)
121 {
122 struct event_base *base;
123 struct evconnlistener *listener;
124 struct sockaddr_storage ss;
125 ev_socklen_t socklen = sizeof(ss);
126 evutil_socket_t fd;
127
128 base = event_base_new();
129 if (base == NULL) {
130 puts("Could not open event base!");
131 exit(1);
132 }
133
134 listener = evconnlistener_new_bind(base, listener_accept_cb, NULL,
135 LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,
136 -1, (struct sockaddr *)&saddr, sizeof(saddr));
137 if (listener == NULL) {
138 my_perror("Could not create listener!");
139 exit(1);
140 }
141 fd = evconnlistener_get_fd(listener);
142 if (fd < 0) {
143 puts("Couldn't get fd from listener");
144 exit(1);
145 }
146 if (getsockname(fd, (struct sockaddr *)&ss, &socklen) < 0) {
147 my_perror("getsockname()");
148 exit(1);
149 }
150 memcpy(&saddr, &ss, sizeof(saddr));
151 if (saddr.sin_family != AF_INET) {
152 puts("AF mismatch from getsockname().");
153 exit(1);
154 }
155
156 start_client(base);
157
158 event_base_dispatch(base);
159
160 evconnlistener_free(listener);
161 event_base_free(base);
162 }
163
164 /*
165 ===============================================
166 Client functions
167 ===============================================
168 */
169
170 /* Check that the server sends back the same byte that the client sent.
171 If MAX_REQUESTS have been reached, exit. Otherwise, start another client. */
172 static void
client_read_cb(struct bufferevent * bev,void * ctx)173 client_read_cb(struct bufferevent *bev, void *ctx)
174 {
175 unsigned char tmp;
176 struct event_base *base = bufferevent_get_base(bev);
177
178 bufferevent_read(bev, &tmp, 1);
179 if (tmp != 'A') {
180 puts("Incorrect data received!");
181 exit(2);
182 }
183 bufferevent_free(bev);
184
185 num_requests++;
186 if (++num_requests < MAX_REQUESTS) {
187 start_client(base);
188 }
189 }
190
191 /* Send a byte to the server. */
192 static void
client_event_cb(struct bufferevent * bev,short events,void * ctx)193 client_event_cb(struct bufferevent *bev, short events, void *ctx)
194 {
195 if (events & BEV_EVENT_CONNECTED) {
196 unsigned char tmp = 'A';
197 bufferevent_write(bev, &tmp, 1);
198 } else if (events & BEV_EVENT_ERROR) {
199 puts("Client socket got error!");
200 exit(2);
201 }
202
203 bufferevent_enable(bev, EV_READ);
204 }
205
206 /* Open a client socket to connect to localhost on sin */
207 static void
start_client(struct event_base * base)208 start_client(struct event_base *base)
209 {
210 struct bufferevent *bev = bufferevent_socket_new(base, -1,
211 BEV_OPT_CLOSE_ON_FREE);
212 bufferevent_setcb(bev, client_read_cb, NULL, client_event_cb, NULL);
213
214 if (bufferevent_socket_connect(bev, (struct sockaddr *)&saddr,
215 sizeof(saddr)) < 0) {
216 my_perror("Could not connect!");
217 bufferevent_free(bev);
218 exit(2);
219 }
220 }
221
222 int
main(int argc,char ** argv)223 main(int argc, char **argv)
224 {
225 #ifdef EVENT__HAVE_SETRLIMIT
226 /* Set the fd limit to a low value so that any fd leak is caught without
227 making many requests. */
228 struct rlimit rl;
229 rl.rlim_cur = rl.rlim_max = 20;
230 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
231 my_perror("setrlimit");
232 exit(3);
233 }
234 #endif
235
236 #ifdef _WIN32
237 WSADATA WSAData;
238 WSAStartup(0x101, &WSAData);
239 #endif
240
241 /* Set up an address, used by both client & server. */
242 memset(&saddr, 0, sizeof(saddr));
243 saddr.sin_family = AF_INET;
244 saddr.sin_addr.s_addr = htonl(0x7f000001);
245 saddr.sin_port = 0; /* Tell the implementation to pick a port. */
246
247 start_loop();
248
249 return 0;
250 }
251
252 /* XXX why does this test cause so much latency sometimes (OSX 10.5)? */
253