xref: /netbsd-src/usr.sbin/bootp/bootptest/bootptest.c (revision 08c81a9c2dc8c7300e893321eb65c0925d60871c)
1 /*	$NetBSD: bootptest.c,v 1.9 2002/07/14 00:30:02 wiz 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 1.9 2002/07/14 00:30:02 wiz Exp $");
40 #endif
41 
42 char *usage = "bootptest [-h] server-name [vendor-data-template-file]";
43 
44 #include <sys/param.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[MAXHOSTNAMELEN + 1];
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 extern int getether(char *, char *);
120 int main(int, char **);
121 void send_request(int);
122 
123 /*
124  * Initialization such as command-line processing is done, then
125  * the receiver loop is started.  Die when interrupted.
126  */
127 
128 int
129 main(int argc, char **argv)
130 {
131 	struct bootp *bp;
132 	struct servent *sep;
133 	struct hostent *hep;
134 
135 	char *servername = NULL;
136 	char *vendor_file = NULL;
137 	char *bp_file = NULL;
138 	int s;				/* Socket file descriptor */
139 	int n, fromlen, recvcnt;
140 	int use_hwa = 0;
141 	int32 vend_magic;
142 	int32 xid;
143 
144 	progname = strrchr(argv[0], '/');
145 	if (progname)
146 		progname++;
147 	else
148 		progname = argv[0];
149 	argc--;
150 	argv++;
151 
152 	if (debug)
153 		printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL);
154 
155 	/*
156 	 * Verify that "struct bootp" has the correct official size.
157 	 * (Catch evil compilers that do struct padding.)
158 	 */
159 	assert(sizeof(struct bootp) == BP_MINPKTSZ);
160 
161 	sndbuf = malloc(BUFLEN);
162 	rcvbuf = malloc(BUFLEN);
163 	if (!sndbuf || !rcvbuf) {
164 		printf("malloc failed\n");
165 		exit(1);
166 	}
167 
168 	/* default magic number */
169 	bcopy(vm_rfc1048, (char*)&vend_magic, 4);
170 
171 	/* Handle option switches. */
172 	while (argc > 0) {
173 		if (argv[0][0] != '-')
174 			break;
175 		switch (argv[0][1]) {
176 
177 		case 'f':				/* File name to reqest. */
178 			if (argc < 2)
179 				goto error;
180 			argc--; argv++;
181 			bp_file = *argv;
182 			break;
183 
184 		case 'h':				/* Use hardware address. */
185 			use_hwa = 1;
186 			break;
187 
188 		case 'm':				/* Magic number value. */
189 			if (argc < 2)
190 				goto error;
191 			argc--; argv++;
192 			vend_magic = inet_addr(*argv);
193 			break;
194 
195 		error:
196 		default:
197 			puts(usage);
198 			exit(1);
199 
200 		}
201 		argc--;
202 		argv++;
203 	}
204 
205 	/* Get server name (or address) for query. */
206 	if (argc > 0) {
207 		servername = *argv;
208 		argc--;
209 		argv++;
210 	}
211 	/* Get optional vendor-data-template-file. */
212 	if (argc > 0) {
213 		vendor_file = *argv;
214 		argc--;
215 		argv++;
216 	}
217 	if (!servername) {
218 		printf("missing server name.\n");
219 		puts(usage);
220 		exit(1);
221 	}
222 	/*
223 	 * Create a socket.
224 	 */
225 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
226 		perror("socket");
227 		exit(1);
228 	}
229 	/*
230 	 * Get server's listening port number
231 	 */
232 	sep = getservbyname("bootps", "udp");
233 	if (sep) {
234 		bootps_port = ntohs((u_short) sep->s_port);
235 	} else {
236 		fprintf(stderr, "udp/bootps: unknown service -- using port %d\n",
237 				IPPORT_BOOTPS);
238 		bootps_port = (u_short) IPPORT_BOOTPS;
239 	}
240 
241 	/*
242 	 * Set up server socket address (for send)
243 	 */
244 	if (servername) {
245 		if (inet_aton(servername, &sin_server.sin_addr) == 0) {
246 			hep = gethostbyname(servername);
247 			if (!hep) {
248 				fprintf(stderr, "%s: unknown host\n", servername);
249 				exit(1);
250 			}
251 			memcpy(&sin_server.sin_addr, hep->h_addr,
252 			    sizeof(sin_server.sin_addr));
253 		}
254 	} else {
255 		/* Get broadcast address */
256 		/* XXX - not yet */
257 		sin_server.sin_addr.s_addr = INADDR_ANY;
258 	}
259 	sin_server.sin_family = AF_INET;
260 	sin_server.sin_port = htons(bootps_port);
261 
262 	/*
263 	 * Get client's listening port number
264 	 */
265 	sep = getservbyname("bootpc", "udp");
266 	if (sep) {
267 		bootpc_port = ntohs(sep->s_port);
268 	} else {
269 		fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n",
270 				IPPORT_BOOTPC);
271 		bootpc_port = (u_short) IPPORT_BOOTPC;
272 	}
273 
274 	/*
275 	 * Set up client socket address (for listen)
276 	 */
277 	sin_client.sin_family = AF_INET;
278 	sin_client.sin_port = htons(bootpc_port);
279 	sin_client.sin_addr.s_addr = INADDR_ANY;
280 
281 	/*
282 	 * Bind client socket to BOOTPC port.
283 	 */
284 	if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) {
285 		perror("bind BOOTPC port");
286 		if (errno == EACCES)
287 			fprintf(stderr, "You need to run this as root\n");
288 		exit(1);
289 	}
290 	/*
291 	 * Build a request.
292 	 */
293 	bp = (struct bootp *) sndbuf;
294 	bzero(bp, sizeof(*bp));
295 	bp->bp_op = BOOTREQUEST;
296 	xid = (int32) getpid();
297 	bp->bp_xid = (u_int32) htonl(xid);
298 	if (bp_file)
299 		strncpy(bp->bp_file, bp_file, BP_FILE_LEN);
300 
301 	/*
302 	 * Fill in the hardware address (or client IP address)
303 	 */
304 	if (use_hwa) {
305 		struct ifreq *ifr;
306 
307 		ifr = getif(s, &sin_server.sin_addr);
308 		if (!ifr) {
309 			printf("No interface for %s\n", servername);
310 			exit(1);
311 		}
312 		if (getether(ifr->ifr_name, eaddr)) {
313 			printf("Can not get ether addr for %s\n", ifr->ifr_name);
314 			exit(1);
315 		}
316 		/* Copy Ethernet address into request packet. */
317 		bp->bp_htype = 1;
318 		bp->bp_hlen = 6;
319 		bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen);
320 	} else {
321 		/* Fill in the client IP address. */
322 		gethostname(hostname, sizeof(hostname));
323 		hostname[sizeof(hostname) - 1] = '\0';
324 		hep = gethostbyname(hostname);
325 		if (!hep) {
326 			printf("Can not get my IP address\n");
327 			exit(1);
328 		}
329 		bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length);
330 	}
331 
332 	/*
333 	 * Copy in the default vendor data.
334 	 */
335 	bcopy((char*)&vend_magic, bp->bp_vend, 4);
336 	if (vend_magic)
337 		bp->bp_vend[4] = TAG_END;
338 
339 	/*
340 	 * Read in the "options" part of the request.
341 	 * This also determines the size of the packet.
342 	 */
343 	snaplen = sizeof(*bp);
344 	if (vendor_file) {
345 		int fd = open(vendor_file, 0);
346 		if (fd < 0) {
347 			perror(vendor_file);
348 			exit(1);
349 		}
350 		/* Compute actual space for options. */
351 		n = BUFLEN - sizeof(*bp) + BP_VEND_LEN;
352 		n = read(fd, bp->bp_vend, n);
353 		close(fd);
354 		if (n < 0) {
355 			perror(vendor_file);
356 			exit(1);
357 		}
358 		printf("read %d bytes of vendor template\n", n);
359 		if (n > BP_VEND_LEN) {
360 			printf("warning: extended options in use (len > %d)\n",
361 				   BP_VEND_LEN);
362 			snaplen += (n - BP_VEND_LEN);
363 		}
364 	}
365 	/*
366 	 * Set globals needed by print_bootp
367 	 * (called by send_request)
368 	 */
369 	packetp = (unsigned char *) eaddr;
370 	snapend = (unsigned char *) sndbuf + snaplen;
371 
372 	/* Send a request once per second while waiting for replies. */
373 	recvcnt = 0;
374 	bp->bp_secs = secs = 0;
375 	send_request(s);
376 	while (1) {
377 		struct timeval tv;
378 		int readfds;
379 
380 		tv.tv_sec = WAITSECS;
381 		tv.tv_usec = 0L;
382 		readfds = (1 << s);
383 		n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv);
384 		if (n < 0) {
385 			perror("select");
386 			break;
387 		}
388 		if (n == 0) {
389 			/*
390 			 * We have not received a response in the last second.
391 			 * If we have ever received any responses, exit now.
392 			 * Otherwise, bump the "wait time" field and re-send.
393 			 */
394 			if (recvcnt > 0)
395 				exit(0);
396 			secs += WAITSECS;
397 			if (secs > MAXWAIT)
398 				break;
399 			bp->bp_secs = htons(secs);
400 			send_request(s);
401 			continue;
402 		}
403 		fromlen = sizeof(sin_from);
404 		n = recvfrom(s, rcvbuf, BUFLEN, 0,
405 					 (struct sockaddr *) &sin_from, &fromlen);
406 		if (n <= 0) {
407 			continue;
408 		}
409 		if (n < sizeof(struct bootp)) {
410 			printf("received short packet\n");
411 			continue;
412 		}
413 		recvcnt++;
414 
415 		/* Print the received packet. */
416 		printf("Recvd from %s", inet_ntoa(sin_from.sin_addr));
417 		/* set globals needed by bootp_print() */
418 		snaplen = n;
419 		snapend = (unsigned char *) rcvbuf + snaplen;
420 		bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0);
421 		putchar('\n');
422 		/*
423 		 * This no longer exits immediately after receiving
424 		 * one response because it is useful to know if the
425 		 * client might get multiple responses.  This code
426 		 * will now listen for one second after a response.
427 		 */
428 	}
429 	fprintf(stderr, "no response from %s\n", servername);
430 	exit(1);
431 }
432 
433 void
434 send_request(int s)
435 {
436 	/* Print the request packet. */
437 	printf("Sending to %s", inet_ntoa(sin_server.sin_addr));
438 	bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0);
439 	putchar('\n');
440 
441 	/* Send the request packet. */
442 	if (sendto(s, sndbuf, snaplen, 0,
443 			   (struct sockaddr *) &sin_server,
444 			   sizeof(sin_server)) < 0)
445 	{
446 		perror("sendto server");
447 		exit(1);
448 	}
449 }
450 
451 /*
452  * Print out a filename (or other ascii string).
453  * Return true if truncated.
454  */
455 int
456 printfn(u_char *s, u_char *ep)
457 {
458 	u_char c;
459 
460 	putchar('"');
461 	while ((c = *s++) != 0) {
462 		if (s > ep) {
463 			putchar('"');
464 			return (1);
465 		}
466 		if (!isascii(c)) {
467 			c = toascii(c);
468 			putchar('M');
469 			putchar('-');
470 		}
471 		if (!isprint(c)) {
472 			c ^= 0x40;			/* DEL to ?, others to alpha */
473 			putchar('^');
474 		}
475 		putchar(c);
476 	}
477 	putchar('"');
478 	return (0);
479 }
480 
481 /*
482  * Convert an IP addr to a string.
483  * (like inet_ntoa, but ina is a pointer)
484  */
485 char *
486 ipaddr_string(struct in_addr *ina)
487 {
488 	static char b[24];
489 	u_char *p;
490 
491 	p = (u_char *) ina;
492 	sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
493 	return (b);
494 }
495 
496 /*
497  * Local Variables:
498  * tab-width: 4
499  * c-indent-level: 4
500  * c-argdecl-indent: 4
501  * c-continued-statement-offset: 4
502  * c-continued-brace-offset: -4
503  * c-label-offset: -4
504  * c-brace-offset: 0
505  * End:
506  */
507