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 <gwr@mc.com>
33 *
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: releng/11.0/libexec/bootpd/tools/bootptest/bootptest.c 297865 2016-04-12 18:18:26Z pfg $");
38
39char *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
74static void send_request();
75
76#define LOG_ERR 1
77#define BUFLEN 1024
78#define WAITSECS 1
79#define MAXWAIT  10
80
81int vflag = 1;
82int tflag = 0;
83int thiszone;
84char *progname;
85unsigned char *packetp;
86unsigned char *snapend;
87int snaplen;
88
89
90/*
91 * IP port numbers for client and server obtained from /etc/services
92 */
93
94u_short bootps_port, bootpc_port;
95
96
97/*
98 * Internet socket and interface config structures
99 */
100
101struct sockaddr_in sin_server;	/* where to send requests */
102struct sockaddr_in sin_client;	/* for bind and listen */
103struct sockaddr_in sin_from;	/* Packet source */
104u_char eaddr[16];				/* Ethernet address */
105
106/*
107 * General
108 */
109
110int debug = 1;					/* Debugging flag (level) */
111char *sndbuf;					/* Send packet buffer */
112char *rcvbuf;					/* Receive packet buffer */
113
114struct utsname my_uname;
115char *hostname;
116
117/*
118 * Vendor magic cookies for CMU and RFC1048
119 */
120
121unsigned char vm_cmu[4] = VM_CMU;
122unsigned char vm_rfc1048[4] = VM_RFC1048;
123short secs;						/* How long client has waited */
124
125char *get_errmsg();
126extern void bootp_print();
127
128/*
129 * Initialization such as command-line processing is done, then
130 * the receiver loop is started.  Die when interrupted.
131 */
132
133int
134main(argc, argv)
135	int argc;
136	char **argv;
137{
138	struct bootp *bp;
139	struct servent *sep;
140	struct hostent *hep;
141
142	char *servername = NULL;
143	char *vendor_file = NULL;
144	char *bp_file = NULL;
145	int32 server_addr;			/* inet addr, network order */
146	int s;						/* Socket file descriptor */
147	int n, fromlen, recvcnt;
148	int use_hwa = 0;
149	int32 vend_magic;
150	int32 xid;
151
152	progname = strrchr(argv[0], '/');
153	if (progname)
154		progname++;
155	else
156		progname = argv[0];
157	argc--;
158	argv++;
159
160	if (debug)
161		printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL);
162
163	/*
164	 * Verify that "struct bootp" has the correct official size.
165	 * (Catch evil compilers that do struct padding.)
166	 */
167	assert(sizeof(struct bootp) == BP_MINPKTSZ);
168
169	if (uname(&my_uname) < 0)
170		errx(1, "can't get hostname");
171	hostname = my_uname.nodename;
172
173	sndbuf = malloc(BUFLEN);
174	rcvbuf = malloc(BUFLEN);
175	if (!sndbuf || !rcvbuf) {
176		printf("malloc failed\n");
177		exit(1);
178	}
179
180	/* default magic number */
181	bcopy(vm_rfc1048, (char*)&vend_magic, 4);
182
183	/* Handle option switches. */
184	while (argc > 0) {
185		if (argv[0][0] != '-')
186			break;
187		switch (argv[0][1]) {
188
189		case 'f':				/* File name to request. */
190			if (argc < 2)
191				goto error;
192			argc--; argv++;
193			bp_file = *argv;
194			break;
195
196		case 'h':				/* Use hardware address. */
197			use_hwa = 1;
198			break;
199
200		case 'm':				/* Magic number value. */
201			if (argc < 2)
202				goto error;
203			argc--; argv++;
204			vend_magic = inet_addr(*argv);
205			break;
206
207		error:
208		default:
209			puts(usage);
210			exit(1);
211
212		}
213		argc--;
214		argv++;
215	}
216
217	/* Get server name (or address) for query. */
218	if (argc > 0) {
219		servername = *argv;
220		argc--;
221		argv++;
222	}
223	/* Get optional vendor-data-template-file. */
224	if (argc > 0) {
225		vendor_file = *argv;
226		argc--;
227		argv++;
228	}
229	if (!servername) {
230		printf("missing server name.\n");
231		puts(usage);
232		exit(1);
233	}
234	/*
235	 * Create a socket.
236	 */
237	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
238		perror("socket");
239		exit(1);
240	}
241	/*
242	 * Get server's listening port number
243	 */
244	sep = getservbyname("bootps", "udp");
245	if (sep) {
246		bootps_port = ntohs((u_short) sep->s_port);
247	} else {
248		warnx("bootps/udp: unknown service -- using port %d",
249				IPPORT_BOOTPS);
250		bootps_port = (u_short) IPPORT_BOOTPS;
251	}
252
253	/*
254	 * Set up server socket address (for send)
255	 */
256	if (servername) {
257		if (isdigit(servername[0]))
258			server_addr = inet_addr(servername);
259		else {
260			hep = gethostbyname(servername);
261			if (!hep)
262				errx(1, "%s: unknown host", servername);
263			bcopy(hep->h_addr, &server_addr, sizeof(server_addr));
264		}
265	} else {
266		/* Get broadcast address */
267		/* XXX - not yet */
268		server_addr = INADDR_ANY;
269	}
270	sin_server.sin_family = AF_INET;
271	sin_server.sin_port = htons(bootps_port);
272	sin_server.sin_addr.s_addr = server_addr;
273
274	/*
275	 * Get client's listening port number
276	 */
277	sep = getservbyname("bootpc", "udp");
278	if (sep) {
279		bootpc_port = ntohs(sep->s_port);
280	} else {
281		warnx("bootpc/udp: unknown service -- using port %d",
282				IPPORT_BOOTPC);
283		bootpc_port = (u_short) IPPORT_BOOTPC;
284	}
285
286	/*
287	 * Set up client socket address (for listen)
288	 */
289	sin_client.sin_family = AF_INET;
290	sin_client.sin_port = htons(bootpc_port);
291	sin_client.sin_addr.s_addr = INADDR_ANY;
292
293	/*
294	 * Bind client socket to BOOTPC port.
295	 */
296	if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) {
297		if (errno == EACCES) {
298			warn("bind BOOTPC port");
299			errx(1, "you need to run this as root");
300		}
301		else
302			err(1, "bind BOOTPC port");
303	}
304	/*
305	 * Build a request.
306	 */
307	bp = (struct bootp *) sndbuf;
308	bzero(bp, sizeof(*bp));
309	bp->bp_op = BOOTREQUEST;
310	xid = (int32) getpid();
311	bp->bp_xid = (u_int32) htonl(xid);
312	if (bp_file)
313		strncpy(bp->bp_file, bp_file, BP_FILE_LEN);
314
315	/*
316	 * Fill in the hardware address (or client IP address)
317	 */
318	if (use_hwa) {
319		struct ifreq *ifr;
320
321		ifr = getif(s, &sin_server.sin_addr);
322		if (!ifr) {
323			printf("No interface for %s\n", servername);
324			exit(1);
325		}
326		if (getether(ifr->ifr_name, (char*)eaddr)) {
327			printf("Can not get ether addr for %s\n", ifr->ifr_name);
328			exit(1);
329		}
330		/* Copy Ethernet address into request packet. */
331		bp->bp_htype = 1;
332		bp->bp_hlen = 6;
333		bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen);
334	} else {
335		/* Fill in the client IP address. */
336		hep = gethostbyname(hostname);
337		if (!hep) {
338			printf("Can not get my IP address\n");
339			exit(1);
340		}
341		bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length);
342	}
343
344	/*
345	 * Copy in the default vendor data.
346	 */
347	bcopy((char*)&vend_magic, bp->bp_vend, 4);
348	if (vend_magic)
349		bp->bp_vend[4] = TAG_END;
350
351	/*
352	 * Read in the "options" part of the request.
353	 * This also determines the size of the packet.
354	 */
355	snaplen = sizeof(*bp);
356	if (vendor_file) {
357		int fd = open(vendor_file, 0);
358		if (fd < 0) {
359			perror(vendor_file);
360			exit(1);
361		}
362		/* Compute actual space for options. */
363		n = BUFLEN - sizeof(*bp) + BP_VEND_LEN;
364		n = read(fd, bp->bp_vend, n);
365		close(fd);
366		if (n < 0) {
367			perror(vendor_file);
368			exit(1);
369		}
370		printf("read %d bytes of vendor template\n", n);
371		if (n > BP_VEND_LEN) {
372			printf("warning: extended options in use (len > %d)\n",
373				   BP_VEND_LEN);
374			snaplen += (n - BP_VEND_LEN);
375		}
376	}
377	/*
378	 * Set globals needed by print_bootp
379	 * (called by send_request)
380	 */
381	packetp = (unsigned char *) eaddr;
382	snapend = (unsigned char *) sndbuf + snaplen;
383
384	/* Send a request once per second while waiting for replies. */
385	recvcnt = 0;
386	bp->bp_secs = secs = 0;
387	send_request(s);
388	while (1) {
389		struct timeval tv;
390		int readfds;
391
392		tv.tv_sec = WAITSECS;
393		tv.tv_usec = 0L;
394		readfds = (1 << s);
395		n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv);
396		if (n < 0) {
397			perror("select");
398			break;
399		}
400		if (n == 0) {
401			/*
402			 * We have not received a response in the last second.
403			 * If we have ever received any responses, exit now.
404			 * Otherwise, bump the "wait time" field and re-send.
405			 */
406			if (recvcnt > 0)
407				exit(0);
408			secs += WAITSECS;
409			if (secs > MAXWAIT)
410				break;
411			bp->bp_secs = htons(secs);
412			send_request(s);
413			continue;
414		}
415		fromlen = sizeof(sin_from);
416		n = recvfrom(s, rcvbuf, BUFLEN, 0,
417					 (struct sockaddr *) &sin_from, &fromlen);
418		if (n <= 0) {
419			continue;
420		}
421		if (n < sizeof(struct bootp)) {
422			printf("received short packet\n");
423			continue;
424		}
425		recvcnt++;
426
427		/* Print the received packet. */
428		printf("Recvd from %s", inet_ntoa(sin_from.sin_addr));
429		/* set globals needed by bootp_print() */
430		snaplen = n;
431		snapend = (unsigned char *) rcvbuf + snaplen;
432		bootp_print(rcvbuf, n, sin_from.sin_port, 0);
433		putchar('\n');
434		/*
435		 * This no longer exits immediately after receiving
436		 * one response because it is useful to know if the
437		 * client might get multiple responses.  This code
438		 * will now listen for one second after a response.
439		 */
440	}
441	errx(1, "no response from %s", servername);
442}
443
444static void
445send_request(s)
446	int s;
447{
448	/* Print the request packet. */
449	printf("Sending to %s", inet_ntoa(sin_server.sin_addr));
450	bootp_print(sndbuf, snaplen, sin_from.sin_port, 0);
451	putchar('\n');
452
453	/* Send the request packet. */
454	if (sendto(s, sndbuf, snaplen, 0,
455			   (struct sockaddr *) &sin_server,
456			   sizeof(sin_server)) < 0)
457	{
458		perror("sendto server");
459		exit(1);
460	}
461}
462
463/*
464 * Print out a filename (or other ascii string).
465 * Return true if truncated.
466 */
467int
468printfn(s, ep)
469	u_char *s, *ep;
470{
471	u_char c;
472
473	putchar('"');
474	while ((c = *s++) != '\0') {
475		if (s > ep) {
476			putchar('"');
477			return (1);
478		}
479		if (!isascii(c)) {
480			c = toascii(c);
481			putchar('M');
482			putchar('-');
483		}
484		if (!isprint(c)) {
485			c ^= 0x40;			/* DEL to ?, others to alpha */
486			putchar('^');
487		}
488		putchar(c);
489	}
490	putchar('"');
491	return (0);
492}
493
494/*
495 * Convert an IP addr to a string.
496 * (like inet_ntoa, but ina is a pointer)
497 */
498char *
499ipaddr_string(ina)
500	struct in_addr *ina;
501{
502	static char b[24];
503	u_char *p;
504
505	p = (u_char *) ina;
506	snprintf(b, sizeof(b), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
507	return (b);
508}
509
510/*
511 * Local Variables:
512 * tab-width: 4
513 * c-indent-level: 4
514 * c-argdecl-indent: 4
515 * c-continued-statement-offset: 4
516 * c-continued-brace-offset: -4
517 * c-label-offset: -4
518 * c-brace-offset: 0
519 * End:
520 */
521