1 /*
2 * bootptest.c - Test out a bootp server.
3 *
4 * This simple program was put together from pieces taken from
5 * various places, including the CMU BOOTP client and server.
6 * The packet printing routine is from the Berkeley "tcpdump"
7 * program with some enhancements I added. The print-bootp.c
8 * file was shared with my copy of "tcpdump" and therefore uses
9 * some unusual utility routines that would normally be provided
10 * by various parts of the tcpdump program. Gordon W. Ross
11 *
12 * Boilerplate:
13 *
14 * This program includes software developed by the University of
15 * California, Lawrence Berkeley Laboratory and its contributors.
16 * (See the copyright notice in print-bootp.c)
17 *
18 * The remainder of this program is public domain. You may do
19 * whatever you like with it except claim that you wrote it.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 *
25 * HISTORY:
26 *
27 * 12/02/93 Released version 1.4 (with bootp-2.3.2)
28 * 11/05/93 Released version 1.3
29 * 10/14/93 Released version 1.2
30 * 10/11/93 Released version 1.1
31 * 09/28/93 Released version 1.0
32 * 09/93 Original developed by Gordon W. Ross <[email protected]>
33 *
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 char *usage = "bootptest [-h] server-name [vendor-data-template-file]";
40
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <sys/ioctl.h>
44 #include <sys/file.h>
45 #include <sys/time.h>
46 #include <sys/stat.h>
47 #include <sys/utsname.h>
48
49 #include <net/if.h>
50 #include <netinet/in.h>
51 #include <arpa/inet.h> /* inet_ntoa */
52
53 #ifndef NO_UNISTD
54 #include <unistd.h>
55 #endif
56
57 #include <err.h>
58 #include <stdlib.h>
59 #include <signal.h>
60 #include <stdio.h>
61 #include <string.h>
62 #include <errno.h>
63 #include <ctype.h>
64 #include <netdb.h>
65 #include <assert.h>
66
67 #include "bootp.h"
68 #include "bootptest.h"
69 #include "getif.h"
70 #include "getether.h"
71
72 #include "patchlevel.h"
73
74 static void send_request(int s);
75
76 #define LOG_ERR 1
77 #define BUFLEN 1024
78 #define WAITSECS 1
79 #define MAXWAIT 10
80
81 int vflag = 1;
82 int tflag = 0;
83 int thiszone;
84 char *progname;
85 unsigned char *packetp;
86 unsigned char *snapend;
87 int snaplen;
88
89
90 /*
91 * IP port numbers for client and server obtained from /etc/services
92 */
93
94 u_short bootps_port, bootpc_port;
95
96
97 /*
98 * Internet socket and interface config structures
99 */
100
101 struct sockaddr_in sin_server; /* where to send requests */
102 struct sockaddr_in sin_client; /* for bind and listen */
103 struct sockaddr_in sin_from; /* Packet source */
104 u_char eaddr[16]; /* Ethernet address */
105
106 /*
107 * General
108 */
109
110 int debug = 1; /* Debugging flag (level) */
111 char *sndbuf; /* Send packet buffer */
112 char *rcvbuf; /* Receive packet buffer */
113
114 struct utsname my_uname;
115 char *hostname;
116
117 /*
118 * Vendor magic cookies for CMU and RFC1048
119 */
120
121 unsigned char vm_cmu[4] = VM_CMU;
122 unsigned char vm_rfc1048[4] = VM_RFC1048;
123 short secs; /* How long client has waited */
124
125 /*
126 * Initialization such as command-line processing is done, then
127 * the receiver loop is started. Die when interrupted.
128 */
129
130 int
main(argc,argv)131 main(argc, argv)
132 int argc;
133 char **argv;
134 {
135 struct bootp *bp;
136 struct servent *sep;
137 struct hostent *hep;
138
139 char *servername = NULL;
140 char *vendor_file = NULL;
141 char *bp_file = NULL;
142 int32 server_addr; /* inet addr, network order */
143 int s; /* Socket file descriptor */
144 int n, fromlen, recvcnt;
145 int use_hwa = 0;
146 int32 vend_magic;
147 int32 xid;
148
149 progname = strrchr(argv[0], '/');
150 if (progname)
151 progname++;
152 else
153 progname = argv[0];
154 argc--;
155 argv++;
156
157 if (debug)
158 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL);
159
160 /*
161 * Verify that "struct bootp" has the correct official size.
162 * (Catch evil compilers that do struct padding.)
163 */
164 assert(sizeof(struct bootp) == BP_MINPKTSZ);
165
166 if (uname(&my_uname) < 0)
167 errx(1, "can't get hostname");
168 hostname = my_uname.nodename;
169
170 sndbuf = malloc(BUFLEN);
171 rcvbuf = malloc(BUFLEN);
172 if (!sndbuf || !rcvbuf) {
173 printf("malloc failed\n");
174 exit(1);
175 }
176
177 /* default magic number */
178 bcopy(vm_rfc1048, (char*)&vend_magic, 4);
179
180 /* Handle option switches. */
181 while (argc > 0) {
182 if (argv[0][0] != '-')
183 break;
184 switch (argv[0][1]) {
185
186 case 'f': /* File name to request. */
187 if (argc < 2)
188 goto error;
189 argc--; argv++;
190 bp_file = *argv;
191 break;
192
193 case 'h': /* Use hardware address. */
194 use_hwa = 1;
195 break;
196
197 case 'm': /* Magic number value. */
198 if (argc < 2)
199 goto error;
200 argc--; argv++;
201 vend_magic = inet_addr(*argv);
202 break;
203
204 error:
205 default:
206 puts(usage);
207 exit(1);
208
209 }
210 argc--;
211 argv++;
212 }
213
214 /* Get server name (or address) for query. */
215 if (argc > 0) {
216 servername = *argv;
217 argc--;
218 argv++;
219 }
220 /* Get optional vendor-data-template-file. */
221 if (argc > 0) {
222 vendor_file = *argv;
223 argc--;
224 argv++;
225 }
226 if (!servername) {
227 printf("missing server name.\n");
228 puts(usage);
229 exit(1);
230 }
231 /*
232 * Create a socket.
233 */
234 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
235 perror("socket");
236 exit(1);
237 }
238 /*
239 * Get server's listening port number
240 */
241 sep = getservbyname("bootps", "udp");
242 if (sep) {
243 bootps_port = ntohs((u_short) sep->s_port);
244 } else {
245 warnx("bootps/udp: unknown service -- using port %d",
246 IPPORT_BOOTPS);
247 bootps_port = (u_short) IPPORT_BOOTPS;
248 }
249
250 /*
251 * Set up server socket address (for send)
252 */
253 if (servername) {
254 if (isdigit(servername[0]))
255 server_addr = inet_addr(servername);
256 else {
257 hep = gethostbyname(servername);
258 if (!hep)
259 errx(1, "%s: unknown host", servername);
260 bcopy(hep->h_addr, &server_addr, sizeof(server_addr));
261 }
262 } else {
263 /* Get broadcast address */
264 /* XXX - not yet */
265 server_addr = INADDR_ANY;
266 }
267 sin_server.sin_family = AF_INET;
268 sin_server.sin_port = htons(bootps_port);
269 sin_server.sin_addr.s_addr = server_addr;
270
271 /*
272 * Get client's listening port number
273 */
274 sep = getservbyname("bootpc", "udp");
275 if (sep) {
276 bootpc_port = ntohs(sep->s_port);
277 } else {
278 warnx("bootpc/udp: unknown service -- using port %d",
279 IPPORT_BOOTPC);
280 bootpc_port = (u_short) IPPORT_BOOTPC;
281 }
282
283 /*
284 * Set up client socket address (for listen)
285 */
286 sin_client.sin_family = AF_INET;
287 sin_client.sin_port = htons(bootpc_port);
288 sin_client.sin_addr.s_addr = INADDR_ANY;
289
290 /*
291 * Bind client socket to BOOTPC port.
292 */
293 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) {
294 if (errno == EACCES) {
295 warn("bind BOOTPC port");
296 errx(1, "you need to run this as root");
297 }
298 else
299 err(1, "bind BOOTPC port");
300 }
301 /*
302 * Build a request.
303 */
304 bp = (struct bootp *) sndbuf;
305 bzero(bp, sizeof(*bp));
306 bp->bp_op = BOOTREQUEST;
307 xid = (int32) getpid();
308 bp->bp_xid = (u_int32) htonl(xid);
309 if (bp_file)
310 strncpy(bp->bp_file, bp_file, BP_FILE_LEN);
311
312 /*
313 * Fill in the hardware address (or client IP address)
314 */
315 if (use_hwa) {
316 struct ifreq *ifr;
317
318 ifr = getif(s, &sin_server.sin_addr);
319 if (!ifr) {
320 printf("No interface for %s\n", servername);
321 exit(1);
322 }
323 if (getether(ifr->ifr_name, (char*)eaddr)) {
324 printf("Can not get ether addr for %s\n", ifr->ifr_name);
325 exit(1);
326 }
327 /* Copy Ethernet address into request packet. */
328 bp->bp_htype = 1;
329 bp->bp_hlen = 6;
330 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen);
331 } else {
332 /* Fill in the client IP address. */
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 errx(1, "no response from %s", servername);
439 }
440
441 static void
send_request(s)442 send_request(s)
443 int s;
444 {
445 /* Print the request packet. */
446 printf("Sending to %s", inet_ntoa(sin_server.sin_addr));
447 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0);
448 putchar('\n');
449
450 /* Send the request packet. */
451 if (sendto(s, sndbuf, snaplen, 0,
452 (struct sockaddr *) &sin_server,
453 sizeof(sin_server)) < 0)
454 {
455 perror("sendto server");
456 exit(1);
457 }
458 }
459
460 /*
461 * Print out a filename (or other ascii string).
462 * Return true if truncated.
463 */
464 int
printfn(s,ep)465 printfn(s, ep)
466 u_char *s, *ep;
467 {
468 u_char c;
469
470 putchar('"');
471 while ((c = *s++) != '\0') {
472 if (s > ep) {
473 putchar('"');
474 return (1);
475 }
476 if (!isascii(c)) {
477 c = toascii(c);
478 putchar('M');
479 putchar('-');
480 }
481 if (!isprint(c)) {
482 c ^= 0x40; /* DEL to ?, others to alpha */
483 putchar('^');
484 }
485 putchar(c);
486 }
487 putchar('"');
488 return (0);
489 }
490
491 /*
492 * Convert an IP addr to a string.
493 * (like inet_ntoa, but ina is a pointer)
494 */
495 char *
ipaddr_string(ina)496 ipaddr_string(ina)
497 struct in_addr *ina;
498 {
499 static char b[24];
500 u_char *p;
501
502 p = (u_char *) ina;
503 snprintf(b, sizeof(b), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
504 return (b);
505 }
506
507 /*
508 * Local Variables:
509 * tab-width: 4
510 * c-indent-level: 4
511 * c-argdecl-indent: 4
512 * c-continued-statement-offset: 4
513 * c-continued-brace-offset: -4
514 * c-label-offset: -4
515 * c-brace-offset: 0
516 * End:
517 */
518