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 * $FreeBSD$
30 */
31
32 #include <sys/socket.h>
33 #include <sys/types.h>
34
35 #include <arpa/inet.h>
36
37 #include <netinet/in.h>
38
39
40 #include <err.h>
41 #include <errno.h>
42 #include <limits.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <sysexits.h>
47 #include <unistd.h>
48
49 static char *testcase;
50 static int accepts;
51 static int debug;
52 static u_int fib = -1;
53 static u_int reflectfib = -1;
54 static uint16_t port = 6666;
55 static char *addr;
56 static int nostart;
57
58 static int
reflect_conn(int s,char * buf,size_t buflen,ssize_t l,struct sockaddr * sa,socklen_t salen)59 reflect_conn(int s, char *buf, size_t buflen, ssize_t l, struct sockaddr *sa,
60 socklen_t salen)
61 {
62 ssize_t m;
63
64 if (l == -1)
65 err(EX_OSERR, "read()");
66 if (l == 0)
67 errx(EX_NOINPUT, "EOF");
68 if ((size_t)l > (buflen - 1))
69 errx(EX_DATAERR, "Input too long");
70 /* Nuke the \n from echo | netcat. */
71 buf[l-1] = '\0';
72
73 /*
74 * Match three cases: (1) START, (2) DONE, (3) anything else.
75 * For anything but START and DONE we just reflect everything.
76 */
77 /*
78 * We expected a "START testcase" on first connect. Otherwise it means
79 * that we are out of sync. Exit to not produce weird results.
80 */
81 if (accepts == 0 && nostart == 0) {
82 if (strncmp(buf, "START ", 6) != 0)
83 errx(EX_PROTOCOL, "Not received START on first "
84 "connect: %s", buf);
85 if (l < 8)
86 errx(EX_PROTOCOL, "START without test case name: %s",
87 buf);
88 if (strcmp(buf+6, testcase) != 0)
89 errx(EX_PROTOCOL, "START test case does not match "
90 "'%s': '%s'", testcase, buf+6);
91 }
92 /* If debug is on, log. */
93 if (debug > 0)
94 fprintf(stderr, "<< %s: %s\n", testcase, buf);
95
96 if (reflectfib != (u_int)-1)
97 l = snprintf(buf, buflen, "FIB %u\n", reflectfib);
98
99 /* If debug is on, log. */
100 if (debug > 0) {
101 buf[l-1] = '\0';
102 fprintf(stderr, ">> %s: %s\n", testcase, buf);
103 }
104
105 /* Reflect data with \n again. */
106 buf[l-1] = '\n';
107
108 if (sa != NULL) {
109 m = sendto(s, buf, l, 0, sa, salen);
110 } else
111 m = write(s, buf, l);
112 /* XXX This is simplified handling. */
113 if (m == -1 && sa != NULL && errno == EHOSTUNREACH)
114 warn("ignored expected: sendto(%s, %zd)", buf, l);
115 else if (m == -1 && (sa == NULL || errno != EHOSTUNREACH))
116 err(EX_OSERR, "write(%s, %zd)", buf, l);
117 else if (m != l)
118 err(EX_OSERR, "short write(%s, %zd) %zd", buf, l, m);
119
120
121 accepts++;
122
123 /* See if we got an end signal. */
124 if (strncmp(buf, "DONE", 4) == 0)
125 return (-2);
126 return (0);
127 }
128
129 static int
reflect_tcp6_conn(int as)130 reflect_tcp6_conn(int as)
131 {
132 char buf[1500];
133 ssize_t l;
134 int error, s;
135
136 s = accept(as, NULL, NULL);
137 if (s == -1)
138 err(EX_OSERR, "accept()");
139
140 l = read(s, buf, sizeof(buf));
141 error = reflect_conn(s, buf, sizeof(buf), l, NULL, 0);
142 close(s);
143
144 return (error);
145 }
146
147 static int
reflect_udp6_conn(int s)148 reflect_udp6_conn(int s)
149 {
150 char buf[1500];
151 struct sockaddr_in6 from;
152 socklen_t fromlen;
153 ssize_t l;
154 int error;
155
156 fromlen = sizeof(from);
157 l = recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *)&from,
158 &fromlen);
159 #if 0
160 if (l != -1) {
161 rc = connect(s, (struct sockaddr *)&from, fromlen);
162 if (rc == -1) {
163 if (inet_ntop(PF_INET6, &from, buf, sizeof(buf)) == NULL)
164 buf[0] = '\0';
165 err(EX_OSERR, "connect(%d, %s, %u)", s, buf, fromlen);
166 }
167 }
168 #endif
169 error = reflect_conn(s, buf, sizeof(buf), l, (struct sockaddr *)&from,
170 fromlen);
171 #if 0
172 if (l != -1) {
173 /* Undo the connect binding again. */
174 fromlen = sizeof(from);
175 bzero(&from, fromlen);
176 from.sin6_len = fromlen;
177 from.sin6_family = AF_INET6;
178 from.sin6_port = htons(port); /* This only gives us a ::1:port ::1:port binding */
179 rc = connect(s, (struct sockaddr *)&from, fromlen);
180 if (rc == -1) {
181 if (inet_ntop(PF_INET6, &from.sin6_addr, buf,
182 sizeof(buf)) == NULL)
183 buf[0] = '\0';
184 err(EX_OSERR, "un-connect(%d, %s, %u)", s, buf, fromlen);
185 }
186 }
187 #endif
188
189 return (error);
190 }
191
192 static int
reflect_6(int domain,int type)193 reflect_6(int domain, int type)
194 {
195 struct sockaddr_in6 sin6;
196 fd_set rset;
197 int i, rc, s;
198
199 /* Get us a listen socket. */
200 s = socket(domain, type, 0);
201 if (s == -1)
202 err(EX_OSERR, "socket()");
203
204 /*
205 * In case a FIB was given on cmd line, set it. Let the kernel do the
206 * the bounds check.
207 */
208 if (fib != (u_int)-1) {
209 rc = setsockopt(s, SOL_SOCKET, SO_SETFIB, &fib, sizeof(fib));
210 if (rc == -1)
211 err(EX_OSERR, "setsockopt(SO_SETFIB)");
212 }
213
214 /* Allow re-use. Otherwise restarting for the next test might error. */
215 i = 1;
216 rc = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
217 if (rc == -1)
218 err(EX_OSERR, "setsockopt(SO_REUSEADDR)");
219 i = 1;
220 rc = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &i, sizeof(i));
221 if (rc == -1)
222 err(EX_OSERR, "setsockopt(SO_REUSEPORT)");
223
224 /* Bind address and port or just port. */
225 sin6.sin6_len = sizeof(sin6);
226 sin6.sin6_family = AF_INET6;
227 sin6.sin6_port = htons(port);
228 sin6.sin6_flowinfo = 0;
229 bzero(&sin6.sin6_addr, sizeof(sin6.sin6_addr));
230 if (addr != NULL) {
231 rc = inet_pton(PF_INET6, addr, &sin6.sin6_addr);
232 if (rc == 0)
233 errx(EX_USAGE, "inet_pton()");
234 else if (rc == -1)
235 err(EX_OSERR, "inet_pton()");
236 else if (rc != 1)
237 errx(EX_SOFTWARE, "inet_pton()");
238 }
239 sin6.sin6_scope_id = 0;
240 rc = bind(s, (struct sockaddr *)&sin6, sizeof(sin6));
241 if (rc == -1)
242 err(EX_OSERR, "bind(%d)", s);
243
244 if (type == SOCK_STREAM) {
245 rc = listen(s, port);
246 if (rc == -1)
247 err(EX_OSERR, "listen(%d, %u)", s, port);
248 }
249
250 /*
251 * We shall never do more than one connection in parallel so can keep
252 * it simple.
253 */
254 do {
255 FD_ZERO(&rset);
256 FD_SET(s, &rset);
257 rc = select(s + 1, &rset, NULL, NULL, NULL);
258 if (rc == -1 && errno != EINTR)
259 err(EX_OSERR, "select()");
260
261 if (rc == 0 || errno == EINTR)
262 continue;
263
264 if (rc != 1)
265 errx(EX_OSERR, "select() miscounted 1 to %d", rc);
266 if (!FD_ISSET(s, &rset))
267 errx(EX_OSERR, "select() did not return our socket");
268
269 if (type == SOCK_STREAM)
270 rc = reflect_tcp6_conn(s);
271 else if (type == SOCK_DGRAM)
272 rc = reflect_udp6_conn(s);
273 else
274 errx(EX_SOFTWARE, "Unsupported socket type %d", type);
275 } while (rc == 0);
276 /* Turn end flagging into no error. */
277 if (rc == -2)
278 rc = 0;
279
280 /* Close listen socket. */
281 close(s);
282
283 return (rc);
284 }
285
286 static int
reflect_tcp6(void)287 reflect_tcp6(void)
288 {
289
290 return (reflect_6(PF_INET6, SOCK_STREAM));
291 }
292
293 static int
reflect_udp6(void)294 reflect_udp6(void)
295 {
296
297 return (reflect_6(PF_INET6, SOCK_DGRAM));
298 }
299
300 int
main(int argc,char * argv[])301 main(int argc, char *argv[])
302 {
303 long long l;
304 char *dummy, *afname;
305 int ch, rc;
306
307 afname = NULL;
308 while ((ch = getopt(argc, argv, "A:dF:f:Np:t:T:")) != -1) {
309 switch (ch) {
310 case 'A':
311 addr = optarg;
312 break;
313 case 'd':
314 debug++;
315 break;
316 case 'F':
317 l = strtoll(optarg, &dummy, 10);
318 if (*dummy != '\0' || l < 0)
319 errx(EX_USAGE, "Invalid FIB number");
320 fib = (u_int)l;
321 break;
322 case 'f':
323 l = strtoll(optarg, &dummy, 10);
324 if (*dummy != '\0' || l < 0)
325 errx(EX_USAGE, "Invalid FIB number");
326 reflectfib = (u_int)l;
327 break;
328 case 'N':
329 nostart=1;
330 break;
331 case 'p':
332 l = strtoll(optarg, &dummy, 10);
333 if (*dummy != '\0' || l < 0)
334 errx(EX_USAGE, "Invalid port number");
335 port = (uint16_t)l;
336 break;
337 case 't':
338 testcase = optarg;
339 break;
340 case 'T':
341 afname = optarg;
342 break;
343 case '?':
344 default:
345 errx(EX_USAGE, "Unknown command line option at '%c'",
346 optopt);
347 /* NOTREACHED */
348 }
349 }
350
351 if (testcase == NULL)
352 errx(EX_USAGE, "Mandatory option -t <testcase> not given");
353 if (afname == NULL)
354 errx(EX_USAGE, "Mandatory option -T <afname> not given");
355
356 if (strcmp(afname, "TCP6") == 0)
357 rc = reflect_tcp6();
358 else if (strcmp(afname, "UDP6") == 0)
359 rc = reflect_udp6();
360 else
361 errx(EX_USAGE, "Mandatory option -T %s not a valid option",
362 afname);
363
364 return (rc);
365 }
366