xref: /netbsd-src/usr.sbin/bootp/bootptest/bootptest.c (revision 7c7c171d130af9949261bc7dce2150a03c3d239c) 
1 /*	$NetBSD: bootptest.c,v 1.5 1998/03/14 04:39:53 lukem Exp $	*/
2 
3 /*
4  * bootptest.c - Test out a bootp server.
5  *
6  * This simple program was put together from pieces taken from
7  * various places, including the CMU BOOTP client and server.
8  * The packet printing routine is from the Berkeley "tcpdump"
9  * program with some enhancements I added.  The print-bootp.c
10  * file was shared with my copy of "tcpdump" and therefore uses
11  * some unusual utility routines that would normally be provided
12  * by various parts of the tcpdump program.  Gordon W. Ross
13  *
14  * Boilerplate:
15  *
16  * This program includes software developed by the University of
17  * California, Lawrence Berkeley Laboratory and its contributors.
18  * (See the copyright notice in print-bootp.c)
19  *
20  * The remainder of this program is public domain.  You may do
21  * whatever you like with it except claim that you wrote it.
22  *
23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
24  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
26  *
27  * HISTORY:
28  *
29  * 12/02/93 Released version 1.4 (with bootp-2.3.2)
30  * 11/05/93 Released version 1.3
31  * 10/14/93 Released version 1.2
32  * 10/11/93 Released version 1.1
33  * 09/28/93 Released version 1.0
34  * 09/93 Original developed by Gordon W. Ross <gwr@mc.com>
35  */
36 
37 #include <sys/cdefs.h>
38 #ifndef lint
39 __RCSID("$NetBSD: bootptest.c,v 1.5 1998/03/14 04:39:53 lukem Exp $");
40 #endif
41 
42 char *usage = "bootptest [-h] server-name [vendor-data-template-file]";
43 
44 #include <sys/types.h>
45 #include <sys/socket.h>
46 #include <sys/ioctl.h>
47 #include <sys/file.h>
48 #include <sys/time.h>
49 #include <sys/stat.h>
50 
51 #include <net/if.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>			/* inet_ntoa */
54 
55 #include <stdlib.h>
56 #include <signal.h>
57 #include <stdio.h>
58 #include <string.h>
59 #include <errno.h>
60 #include <ctype.h>
61 #include <netdb.h>
62 #include <assert.h>
63 #include <unistd.h>
64 
65 #include "bootp.h"
66 #include "bootptest.h"
67 #include "getif.h"
68 #include "report.h"
69 #include "patchlevel.h"
70 
71 #define LOG_ERR 1
72 #define BUFLEN 1024
73 #define WAITSECS 1
74 #define MAXWAIT  10
75 
76 int vflag = 1;
77 int tflag = 0;
78 int thiszone;
79 char *progname;
80 unsigned char *packetp;
81 unsigned char *snapend;
82 int snaplen;
83 
84 
85 /*
86  * IP port numbers for client and server obtained from /etc/services
87  */
88 
89 u_short bootps_port, bootpc_port;
90 
91 
92 /*
93  * Internet socket and interface config structures
94  */
95 
96 struct sockaddr_in sin_server;	/* where to send requests */
97 struct sockaddr_in sin_client;	/* for bind and listen */
98 struct sockaddr_in sin_from;	/* Packet source */
99 u_char eaddr[16];				/* Ethernet address */
100 
101 /*
102  * General
103  */
104 
105 int debug = 1;					/* Debugging flag (level) */
106 char hostname[64];
107 char *sndbuf;					/* Send packet buffer */
108 char *rcvbuf;					/* Receive packet buffer */
109 
110 /*
111  * Vendor magic cookies for CMU and RFC1048
112  */
113 
114 unsigned char vm_cmu[4] = VM_CMU;
115 unsigned char vm_rfc1048[4] = VM_RFC1048;
116 short secs;						/* How long client has waited */
117 
118 
119 #ifdef	__STDC__
120 #define P(args) args
121 #else
122 #define P(args) ()
123 #endif
124 
125 extern int getether P((char *, char *));
126 int main P((int, char **));
127 void send_request P((int));
128 
129 #undef P
130 
131 /*
132  * Initialization such as command-line processing is done, then
133  * the receiver loop is started.  Die when interrupted.
134  */
135 
136 int
137 main(argc, argv)
138 	int argc;
139 	char **argv;
140 {
141 	struct bootp *bp;
142 	struct servent *sep;
143 	struct hostent *hep;
144 
145 	char *servername = NULL;
146 	char *vendor_file = NULL;
147 	char *bp_file = NULL;
148 	int s;				/* Socket file descriptor */
149 	int n, fromlen, recvcnt;
150 	int use_hwa = 0;
151 	int32 vend_magic;
152 	int32 xid;
153 
154 	progname = strrchr(argv[0], '/');
155 	if (progname)
156 		progname++;
157 	else
158 		progname = argv[0];
159 	argc--;
160 	argv++;
161 
162 	if (debug)
163 		printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL);
164 
165 	/*
166 	 * Verify that "struct bootp" has the correct official size.
167 	 * (Catch evil compilers that do struct padding.)
168 	 */
169 	assert(sizeof(struct bootp) == BP_MINPKTSZ);
170 
171 	sndbuf = malloc(BUFLEN);
172 	rcvbuf = malloc(BUFLEN);
173 	if (!sndbuf || !rcvbuf) {
174 		printf("malloc failed\n");
175 		exit(1);
176 	}
177 
178 	/* default magic number */
179 	bcopy(vm_rfc1048, (char*)&vend_magic, 4);
180 
181 	/* Handle option switches. */
182 	while (argc > 0) {
183 		if (argv[0][0] != '-')
184 			break;
185 		switch (argv[0][1]) {
186 
187 		case 'f':				/* File name to reqest. */
188 			if (argc < 2)
189 				goto error;
190 			argc--; argv++;
191 			bp_file = *argv;
192 			break;
193 
194 		case 'h':				/* Use hardware address. */
195 			use_hwa = 1;
196 			break;
197 
198 		case 'm':				/* Magic number value. */
199 			if (argc < 2)
200 				goto error;
201 			argc--; argv++;
202 			vend_magic = inet_addr(*argv);
203 			break;
204 
205 		error:
206 		default:
207 			puts(usage);
208 			exit(1);
209 
210 		}
211 		argc--;
212 		argv++;
213 	}
214 
215 	/* Get server name (or address) for query. */
216 	if (argc > 0) {
217 		servername = *argv;
218 		argc--;
219 		argv++;
220 	}
221 	/* Get optional vendor-data-template-file. */
222 	if (argc > 0) {
223 		vendor_file = *argv;
224 		argc--;
225 		argv++;
226 	}
227 	if (!servername) {
228 		printf("missing server name.\n");
229 		puts(usage);
230 		exit(1);
231 	}
232 	/*
233 	 * Create a socket.
234 	 */
235 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
236 		perror("socket");
237 		exit(1);
238 	}
239 	/*
240 	 * Get server's listening port number
241 	 */
242 	sep = getservbyname("bootps", "udp");
243 	if (sep) {
244 		bootps_port = ntohs((u_short) sep->s_port);
245 	} else {
246 		fprintf(stderr, "udp/bootps: unknown service -- using port %d\n",
247 				IPPORT_BOOTPS);
248 		bootps_port = (u_short) IPPORT_BOOTPS;
249 	}
250 
251 	/*
252 	 * Set up server socket address (for send)
253 	 */
254 	if (servername) {
255 		if (inet_aton(servername, &sin_server.sin_addr) == 0) {
256 			hep = gethostbyname(servername);
257 			if (!hep) {
258 				fprintf(stderr, "%s: unknown host\n", servername);
259 				exit(1);
260 			}
261 			memcpy(&sin_server.sin_addr, hep->h_addr,
262 			    sizeof(sin_server.sin_addr));
263 		}
264 	} else {
265 		/* Get broadcast address */
266 		/* XXX - not yet */
267 		sin_server.sin_addr.s_addr = INADDR_ANY;
268 	}
269 	sin_server.sin_family = AF_INET;
270 	sin_server.sin_port = htons(bootps_port);
271 
272 	/*
273 	 * Get client's listening port number
274 	 */
275 	sep = getservbyname("bootpc", "udp");
276 	if (sep) {
277 		bootpc_port = ntohs(sep->s_port);
278 	} else {
279 		fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n",
280 				IPPORT_BOOTPC);
281 		bootpc_port = (u_short) IPPORT_BOOTPC;
282 	}
283 
284 	/*
285 	 * Set up client socket address (for listen)
286 	 */
287 	sin_client.sin_family = AF_INET;
288 	sin_client.sin_port = htons(bootpc_port);
289 	sin_client.sin_addr.s_addr = INADDR_ANY;
290 
291 	/*
292 	 * Bind client socket to BOOTPC port.
293 	 */
294 	if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) {
295 		perror("bind BOOTPC port");
296 		if (errno == EACCES)
297 			fprintf(stderr, "You need to run this as root\n");
298 		exit(1);
299 	}
300 	/*
301 	 * Build a request.
302 	 */
303 	bp = (struct bootp *) sndbuf;
304 	bzero(bp, sizeof(*bp));
305 	bp->bp_op = BOOTREQUEST;
306 	xid = (int32) getpid();
307 	bp->bp_xid = (u_int32) htonl(xid);
308 	if (bp_file)
309 		strncpy(bp->bp_file, bp_file, BP_FILE_LEN);
310 
311 	/*
312 	 * Fill in the hardware address (or client IP address)
313 	 */
314 	if (use_hwa) {
315 		struct ifreq *ifr;
316 
317 		ifr = getif(s, &sin_server.sin_addr);
318 		if (!ifr) {
319 			printf("No interface for %s\n", servername);
320 			exit(1);
321 		}
322 		if (getether(ifr->ifr_name, eaddr)) {
323 			printf("Can not get ether addr for %s\n", ifr->ifr_name);
324 			exit(1);
325 		}
326 		/* Copy Ethernet address into request packet. */
327 		bp->bp_htype = 1;
328 		bp->bp_hlen = 6;
329 		bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen);
330 	} else {
331 		/* Fill in the client IP address. */
332 		gethostname(hostname, sizeof(hostname));
333 		hep = gethostbyname(hostname);
334 		if (!hep) {
335 			printf("Can not get my IP address\n");
336 			exit(1);
337 		}
338 		bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length);
339 	}
340 
341 	/*
342 	 * Copy in the default vendor data.
343 	 */
344 	bcopy((char*)&vend_magic, bp->bp_vend, 4);
345 	if (vend_magic)
346 		bp->bp_vend[4] = TAG_END;
347 
348 	/*
349 	 * Read in the "options" part of the request.
350 	 * This also determines the size of the packet.
351 	 */
352 	snaplen = sizeof(*bp);
353 	if (vendor_file) {
354 		int fd = open(vendor_file, 0);
355 		if (fd < 0) {
356 			perror(vendor_file);
357 			exit(1);
358 		}
359 		/* Compute actual space for options. */
360 		n = BUFLEN - sizeof(*bp) + BP_VEND_LEN;
361 		n = read(fd, bp->bp_vend, n);
362 		close(fd);
363 		if (n < 0) {
364 			perror(vendor_file);
365 			exit(1);
366 		}
367 		printf("read %d bytes of vendor template\n", n);
368 		if (n > BP_VEND_LEN) {
369 			printf("warning: extended options in use (len > %d)\n",
370 				   BP_VEND_LEN);
371 			snaplen += (n - BP_VEND_LEN);
372 		}
373 	}
374 	/*
375 	 * Set globals needed by print_bootp
376 	 * (called by send_request)
377 	 */
378 	packetp = (unsigned char *) eaddr;
379 	snapend = (unsigned char *) sndbuf + snaplen;
380 
381 	/* Send a request once per second while waiting for replies. */
382 	recvcnt = 0;
383 	bp->bp_secs = secs = 0;
384 	send_request(s);
385 	while (1) {
386 		struct timeval tv;
387 		int readfds;
388 
389 		tv.tv_sec = WAITSECS;
390 		tv.tv_usec = 0L;
391 		readfds = (1 << s);
392 		n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv);
393 		if (n < 0) {
394 			perror("select");
395 			break;
396 		}
397 		if (n == 0) {
398 			/*
399 			 * We have not received a response in the last second.
400 			 * If we have ever received any responses, exit now.
401 			 * Otherwise, bump the "wait time" field and re-send.
402 			 */
403 			if (recvcnt > 0)
404 				exit(0);
405 			secs += WAITSECS;
406 			if (secs > MAXWAIT)
407 				break;
408 			bp->bp_secs = htons(secs);
409 			send_request(s);
410 			continue;
411 		}
412 		fromlen = sizeof(sin_from);
413 		n = recvfrom(s, rcvbuf, BUFLEN, 0,
414 					 (struct sockaddr *) &sin_from, &fromlen);
415 		if (n <= 0) {
416 			continue;
417 		}
418 		if (n < sizeof(struct bootp)) {
419 			printf("received short packet\n");
420 			continue;
421 		}
422 		recvcnt++;
423 
424 		/* Print the received packet. */
425 		printf("Recvd from %s", inet_ntoa(sin_from.sin_addr));
426 		/* set globals needed by bootp_print() */
427 		snaplen = n;
428 		snapend = (unsigned char *) rcvbuf + snaplen;
429 		bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0);
430 		putchar('\n');
431 		/*
432 		 * This no longer exits immediately after receiving
433 		 * one response because it is useful to know if the
434 		 * client might get multiple responses.  This code
435 		 * will now listen for one second after a response.
436 		 */
437 	}
438 	fprintf(stderr, "no response from %s\n", servername);
439 	exit(1);
440 }
441 
442 void
443 send_request(s)
444 	int s;
445 {
446 	/* Print the request packet. */
447 	printf("Sending to %s", inet_ntoa(sin_server.sin_addr));
448 	bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0);
449 	putchar('\n');
450 
451 	/* Send the request packet. */
452 	if (sendto(s, sndbuf, snaplen, 0,
453 			   (struct sockaddr *) &sin_server,
454 			   sizeof(sin_server)) < 0)
455 	{
456 		perror("sendto server");
457 		exit(1);
458 	}
459 }
460 
461 /*
462  * Print out a filename (or other ascii string).
463  * Return true if truncated.
464  */
465 int
466 printfn(s, ep)
467 	register u_char *s, *ep;
468 {
469 	register u_char c;
470 
471 	putchar('"');
472 	while ((c = *s++) != 0) {
473 		if (s > ep) {
474 			putchar('"');
475 			return (1);
476 		}
477 		if (!isascii(c)) {
478 			c = toascii(c);
479 			putchar('M');
480 			putchar('-');
481 		}
482 		if (!isprint(c)) {
483 			c ^= 0x40;			/* DEL to ?, others to alpha */
484 			putchar('^');
485 		}
486 		putchar(c);
487 	}
488 	putchar('"');
489 	return (0);
490 }
491 
492 /*
493  * Convert an IP addr to a string.
494  * (like inet_ntoa, but ina is a pointer)
495  */
496 char *
497 ipaddr_string(ina)
498 	struct in_addr *ina;
499 {
500 	static char b[24];
501 	u_char *p;
502 
503 	p = (u_char *) ina;
504 	sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
505 	return (b);
506 }
507 
508 /*
509  * Local Variables:
510  * tab-width: 4
511  * c-indent-level: 4
512  * c-argdecl-indent: 4
513  * c-continued-statement-offset: 4
514  * c-continued-brace-offset: -4
515  * c-label-offset: -4
516  * c-brace-offset: 0
517  * End:
518  */
519