1 /*-
2 * Copyright (c) 2012 Cisco Systems, Inc.
3 * All rights reserved.
4 *
5 * This software was developed by Bjoern Zeeb under contract to
6 * Cisco Systems, Inc..
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/socket.h>
31 #include <sys/types.h>
32
33 #include <arpa/inet.h>
34
35 #include <netinet/in.h>
36
37
38 #include <err.h>
39 #include <errno.h>
40 #include <limits.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <sysexits.h>
45 #include <unistd.h>
46
47 static char *testcase;
48 static int accepts;
49 static int debug;
50 static u_int fib = -1;
51 static u_int reflectfib = -1;
52 static uint16_t port = 6666;
53 static char *addr;
54 static int nostart;
55
56 static int
reflect_conn(int s,char * buf,size_t buflen,ssize_t l,struct sockaddr * sa,socklen_t salen)57 reflect_conn(int s, char *buf, size_t buflen, ssize_t l, struct sockaddr *sa,
58 socklen_t salen)
59 {
60 ssize_t m;
61
62 if (l == -1)
63 err(EX_OSERR, "read()");
64 if (l == 0)
65 errx(EX_NOINPUT, "EOF");
66 if ((size_t)l > (buflen - 1))
67 errx(EX_DATAERR, "Input too long");
68 /* Nuke the \n from echo | netcat. */
69 buf[l-1] = '\0';
70
71 /*
72 * Match three cases: (1) START, (2) DONE, (3) anything else.
73 * For anything but START and DONE we just reflect everything.
74 */
75 /*
76 * We expected a "START testcase" on first connect. Otherwise it means
77 * that we are out of sync. Exit to not produce weird results.
78 */
79 if (accepts == 0 && nostart == 0) {
80 if (strncmp(buf, "START ", 6) != 0)
81 errx(EX_PROTOCOL, "Not received START on first "
82 "connect: %s", buf);
83 if (l < 8)
84 errx(EX_PROTOCOL, "START without test case name: %s",
85 buf);
86 if (strcmp(buf+6, testcase) != 0)
87 errx(EX_PROTOCOL, "START test case does not match "
88 "'%s': '%s'", testcase, buf+6);
89 }
90 /* If debug is on, log. */
91 if (debug > 0)
92 fprintf(stderr, "<< %s: %s\n", testcase, buf);
93
94 if (reflectfib != (u_int)-1)
95 l = snprintf(buf, buflen, "FIB %u\n", reflectfib);
96
97 /* If debug is on, log. */
98 if (debug > 0) {
99 buf[l-1] = '\0';
100 fprintf(stderr, ">> %s: %s\n", testcase, buf);
101 }
102
103 /* Reflect data with \n again. */
104 buf[l-1] = '\n';
105
106 if (sa != NULL) {
107 m = sendto(s, buf, l, 0, sa, salen);
108 } else
109 m = write(s, buf, l);
110 /* XXX This is simplified handling. */
111 if (m == -1 && sa != NULL && errno == EHOSTUNREACH)
112 warn("ignored expected: sendto(%s, %zd)", buf, l);
113 else if (m == -1 && (sa == NULL || errno != EHOSTUNREACH))
114 err(EX_OSERR, "write(%s, %zd)", buf, l);
115 else if (m != l)
116 err(EX_OSERR, "short write(%s, %zd) %zd", buf, l, m);
117
118
119 accepts++;
120
121 /* See if we got an end signal. */
122 if (strncmp(buf, "DONE", 4) == 0)
123 return (-2);
124 return (0);
125 }
126
127 static int
reflect_tcp6_conn(int as)128 reflect_tcp6_conn(int as)
129 {
130 char buf[1500];
131 ssize_t l;
132 int error, s;
133
134 s = accept(as, NULL, NULL);
135 if (s == -1)
136 err(EX_OSERR, "accept()");
137
138 l = read(s, buf, sizeof(buf));
139 error = reflect_conn(s, buf, sizeof(buf), l, NULL, 0);
140 close(s);
141
142 return (error);
143 }
144
145 static int
reflect_udp6_conn(int s)146 reflect_udp6_conn(int s)
147 {
148 char buf[1500];
149 struct sockaddr_in6 from;
150 socklen_t fromlen;
151 ssize_t l;
152 int error;
153
154 fromlen = sizeof(from);
155 l = recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *)&from,
156 &fromlen);
157 #if 0
158 if (l != -1) {
159 rc = connect(s, (struct sockaddr *)&from, fromlen);
160 if (rc == -1) {
161 if (inet_ntop(PF_INET6, &from, buf, sizeof(buf)) == NULL)
162 buf[0] = '\0';
163 err(EX_OSERR, "connect(%d, %s, %u)", s, buf, fromlen);
164 }
165 }
166 #endif
167 error = reflect_conn(s, buf, sizeof(buf), l, (struct sockaddr *)&from,
168 fromlen);
169 #if 0
170 if (l != -1) {
171 /* Undo the connect binding again. */
172 fromlen = sizeof(from);
173 bzero(&from, fromlen);
174 from.sin6_len = fromlen;
175 from.sin6_family = AF_INET6;
176 from.sin6_port = htons(port); /* This only gives us a ::1:port ::1:port binding */
177 rc = connect(s, (struct sockaddr *)&from, fromlen);
178 if (rc == -1) {
179 if (inet_ntop(PF_INET6, &from.sin6_addr, buf,
180 sizeof(buf)) == NULL)
181 buf[0] = '\0';
182 err(EX_OSERR, "un-connect(%d, %s, %u)", s, buf, fromlen);
183 }
184 }
185 #endif
186
187 return (error);
188 }
189
190 static int
reflect_6(int domain,int type)191 reflect_6(int domain, int type)
192 {
193 struct sockaddr_in6 sin6;
194 fd_set rset;
195 int i, rc, s;
196
197 /* Get us a listen socket. */
198 s = socket(domain, type, 0);
199 if (s == -1)
200 err(EX_OSERR, "socket()");
201
202 /*
203 * In case a FIB was given on cmd line, set it. Let the kernel do the
204 * the bounds check.
205 */
206 if (fib != (u_int)-1) {
207 rc = setsockopt(s, SOL_SOCKET, SO_SETFIB, &fib, sizeof(fib));
208 if (rc == -1)
209 err(EX_OSERR, "setsockopt(SO_SETFIB)");
210 }
211
212 /* Allow re-use. Otherwise restarting for the next test might error. */
213 i = 1;
214 rc = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
215 if (rc == -1)
216 err(EX_OSERR, "setsockopt(SO_REUSEADDR)");
217 i = 1;
218 rc = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &i, sizeof(i));
219 if (rc == -1)
220 err(EX_OSERR, "setsockopt(SO_REUSEPORT)");
221
222 /* Bind address and port or just port. */
223 sin6.sin6_len = sizeof(sin6);
224 sin6.sin6_family = AF_INET6;
225 sin6.sin6_port = htons(port);
226 sin6.sin6_flowinfo = 0;
227 bzero(&sin6.sin6_addr, sizeof(sin6.sin6_addr));
228 if (addr != NULL) {
229 rc = inet_pton(PF_INET6, addr, &sin6.sin6_addr);
230 if (rc == 0)
231 errx(EX_USAGE, "inet_pton()");
232 else if (rc == -1)
233 err(EX_OSERR, "inet_pton()");
234 else if (rc != 1)
235 errx(EX_SOFTWARE, "inet_pton()");
236 }
237 sin6.sin6_scope_id = 0;
238 rc = bind(s, (struct sockaddr *)&sin6, sizeof(sin6));
239 if (rc == -1)
240 err(EX_OSERR, "bind(%d)", s);
241
242 if (type == SOCK_STREAM) {
243 rc = listen(s, port);
244 if (rc == -1)
245 err(EX_OSERR, "listen(%d, %u)", s, port);
246 }
247
248 /*
249 * We shall never do more than one connection in parallel so can keep
250 * it simple.
251 */
252 do {
253 FD_ZERO(&rset);
254 FD_SET(s, &rset);
255 rc = select(s + 1, &rset, NULL, NULL, NULL);
256 if (rc == -1 && errno != EINTR)
257 err(EX_OSERR, "select()");
258
259 if (rc == 0 || errno == EINTR)
260 continue;
261
262 if (rc != 1)
263 errx(EX_OSERR, "select() miscounted 1 to %d", rc);
264 if (!FD_ISSET(s, &rset))
265 errx(EX_OSERR, "select() did not return our socket");
266
267 if (type == SOCK_STREAM)
268 rc = reflect_tcp6_conn(s);
269 else if (type == SOCK_DGRAM)
270 rc = reflect_udp6_conn(s);
271 else
272 errx(EX_SOFTWARE, "Unsupported socket type %d", type);
273 } while (rc == 0);
274 /* Turn end flagging into no error. */
275 if (rc == -2)
276 rc = 0;
277
278 /* Close listen socket. */
279 close(s);
280
281 return (rc);
282 }
283
284 static int
reflect_tcp6(void)285 reflect_tcp6(void)
286 {
287
288 return (reflect_6(PF_INET6, SOCK_STREAM));
289 }
290
291 static int
reflect_udp6(void)292 reflect_udp6(void)
293 {
294
295 return (reflect_6(PF_INET6, SOCK_DGRAM));
296 }
297
298 int
main(int argc,char * argv[])299 main(int argc, char *argv[])
300 {
301 long long l;
302 char *dummy, *afname;
303 int ch, rc;
304
305 afname = NULL;
306 while ((ch = getopt(argc, argv, "A:dF:f:Np:t:T:")) != -1) {
307 switch (ch) {
308 case 'A':
309 addr = optarg;
310 break;
311 case 'd':
312 debug++;
313 break;
314 case 'F':
315 l = strtoll(optarg, &dummy, 10);
316 if (*dummy != '\0' || l < 0)
317 errx(EX_USAGE, "Invalid FIB number");
318 fib = (u_int)l;
319 break;
320 case 'f':
321 l = strtoll(optarg, &dummy, 10);
322 if (*dummy != '\0' || l < 0)
323 errx(EX_USAGE, "Invalid FIB number");
324 reflectfib = (u_int)l;
325 break;
326 case 'N':
327 nostart=1;
328 break;
329 case 'p':
330 l = strtoll(optarg, &dummy, 10);
331 if (*dummy != '\0' || l < 0)
332 errx(EX_USAGE, "Invalid port number");
333 port = (uint16_t)l;
334 break;
335 case 't':
336 testcase = optarg;
337 break;
338 case 'T':
339 afname = optarg;
340 break;
341 case '?':
342 default:
343 errx(EX_USAGE, "Unknown command line option at '%c'",
344 optopt);
345 /* NOTREACHED */
346 }
347 }
348
349 if (testcase == NULL)
350 errx(EX_USAGE, "Mandatory option -t <testcase> not given");
351 if (afname == NULL)
352 errx(EX_USAGE, "Mandatory option -T <afname> not given");
353
354 if (strcmp(afname, "TCP6") == 0)
355 rc = reflect_tcp6();
356 else if (strcmp(afname, "UDP6") == 0)
357 rc = reflect_udp6();
358 else
359 errx(EX_USAGE, "Mandatory option -T %s not a valid option",
360 afname);
361
362 return (rc);
363 }
364