1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 #ifndef lint
23 static const char copyright[] =
24 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
25 The Regents of the University of California. All rights reserved.\n";
26 #endif
27
28 #include <pcap.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdarg.h>
33 #include <unistd.h>
34 #include <errno.h>
35 #include <sys/types.h>
36 #include <sys/select.h>
37 #include <poll.h>
38
39 char *program_name;
40
41 /* Forwards */
42 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
43 static void usage(void) __attribute__((noreturn));
44 static void error(const char *, ...);
45 static void warning(const char *, ...);
46 static char *copy_argv(char **);
47
48 static pcap_t *pd;
49
50 extern int optind;
51 extern int opterr;
52 extern char *optarg;
53
54 int
main(int argc,char ** argv)55 main(int argc, char **argv)
56 {
57 register int op;
58 bpf_u_int32 localnet, netmask;
59 register char *cp, *cmdbuf, *device;
60 int doselect, dopoll, dotimeout, dononblock;
61 struct bpf_program fcode;
62 char ebuf[PCAP_ERRBUF_SIZE];
63 int selectable_fd;
64 int status;
65 int packet_count;
66
67 device = NULL;
68 doselect = 0;
69 dopoll = 0;
70 dotimeout = 0;
71 dononblock = 0;
72 if ((cp = strrchr(argv[0], '/')) != NULL)
73 program_name = cp + 1;
74 else
75 program_name = argv[0];
76
77 opterr = 0;
78 while ((op = getopt(argc, argv, "i:sptn")) != -1) {
79 switch (op) {
80
81 case 'i':
82 device = optarg;
83 break;
84
85 case 's':
86 doselect = 1;
87 break;
88
89 case 'p':
90 dopoll = 1;
91 break;
92
93 case 't':
94 dotimeout = 1;
95 break;
96
97 case 'n':
98 dononblock = 1;
99 break;
100
101 default:
102 usage();
103 /* NOTREACHED */
104 }
105 }
106
107 if (doselect && dopoll) {
108 fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n");
109 return 1;
110 }
111 if (dotimeout && !doselect && !dopoll) {
112 fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n");
113 return 1;
114 }
115 if (device == NULL) {
116 device = pcap_lookupdev(ebuf);
117 if (device == NULL)
118 error("%s", ebuf);
119 }
120 *ebuf = '\0';
121 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
122 if (pd == NULL)
123 error("%s", ebuf);
124 else if (*ebuf)
125 warning("%s", ebuf);
126 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
127 localnet = 0;
128 netmask = 0;
129 warning("%s", ebuf);
130 }
131 cmdbuf = copy_argv(&argv[optind]);
132
133 if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
134 error("%s", pcap_geterr(pd));
135
136 if (pcap_setfilter(pd, &fcode) < 0)
137 error("%s", pcap_geterr(pd));
138 if (pcap_get_selectable_fd(pd) == -1)
139 error("pcap_get_selectable_fd() fails");
140 if (dononblock) {
141 if (pcap_setnonblock(pd, 1, ebuf) == -1)
142 error("pcap_setnonblock failed: %s", ebuf);
143 }
144 selectable_fd = pcap_get_selectable_fd(pd);
145 printf("Listening on %s\n", device);
146 if (doselect) {
147 for (;;) {
148 fd_set setread, setexcept;
149 struct timeval seltimeout;
150
151 FD_ZERO(&setread);
152 FD_SET(selectable_fd, &setread);
153 FD_ZERO(&setexcept);
154 FD_SET(selectable_fd, &setexcept);
155 if (dotimeout) {
156 seltimeout.tv_sec = 0;
157 seltimeout.tv_usec = 1000;
158 status = select(selectable_fd + 1, &setread,
159 NULL, &setexcept, &seltimeout);
160 } else {
161 status = select(selectable_fd + 1, &setread,
162 NULL, &setexcept, NULL);
163 }
164 if (status == -1) {
165 printf("Select returns error (%s)\n",
166 strerror(errno));
167 } else {
168 if (status == 0)
169 printf("Select timed out: ");
170 else
171 printf("Select returned a descriptor: ");
172 if (FD_ISSET(selectable_fd, &setread))
173 printf("readable, ");
174 else
175 printf("not readable, ");
176 if (FD_ISSET(selectable_fd, &setexcept))
177 printf("exceptional condition\n");
178 else
179 printf("no exceptional condition\n");
180 packet_count = 0;
181 status = pcap_dispatch(pd, -1, countme,
182 (u_char *)&packet_count);
183 if (status < 0)
184 break;
185 printf("%d packets seen, %d packets counted after select returns\n",
186 status, packet_count);
187 }
188 }
189 } else if (dopoll) {
190 for (;;) {
191 struct pollfd fd;
192 int polltimeout;
193
194 fd.fd = selectable_fd;
195 fd.events = POLLIN;
196 if (dotimeout)
197 polltimeout = 1;
198 else
199 polltimeout = -1;
200 status = poll(&fd, 1, polltimeout);
201 if (status == -1) {
202 printf("Poll returns error (%s)\n",
203 strerror(errno));
204 } else {
205 if (status == 0)
206 printf("Poll timed out\n");
207 else {
208 printf("Poll returned a descriptor: ");
209 if (fd.revents & POLLIN)
210 printf("readable, ");
211 else
212 printf("not readable, ");
213 if (fd.revents & POLLERR)
214 printf("exceptional condition, ");
215 else
216 printf("no exceptional condition, ");
217 if (fd.revents & POLLHUP)
218 printf("disconnect, ");
219 else
220 printf("no disconnect, ");
221 if (fd.revents & POLLNVAL)
222 printf("invalid\n");
223 else
224 printf("not invalid\n");
225 }
226 packet_count = 0;
227 status = pcap_dispatch(pd, -1, countme,
228 (u_char *)&packet_count);
229 if (status < 0)
230 break;
231 printf("%d packets seen, %d packets counted after poll returns\n",
232 status, packet_count);
233 }
234 }
235 } else {
236 for (;;) {
237 packet_count = 0;
238 status = pcap_dispatch(pd, -1, countme,
239 (u_char *)&packet_count);
240 if (status < 0)
241 break;
242 printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
243 status, packet_count);
244 }
245 }
246 if (status == -2) {
247 /*
248 * We got interrupted, so perhaps we didn't
249 * manage to finish a line we were printing.
250 * Print an extra newline, just in case.
251 */
252 putchar('\n');
253 }
254 (void)fflush(stdout);
255 if (status == -1) {
256 /*
257 * Error. Report it.
258 */
259 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
260 program_name, pcap_geterr(pd));
261 }
262 pcap_close(pd);
263 exit(status == -1 ? 1 : 0);
264 }
265
266 static void
countme(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)267 countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
268 {
269 int *counterp = (int *)user;
270
271 (*counterp)++;
272 }
273
274 static void
usage(void)275 usage(void)
276 {
277 (void)fprintf(stderr, "Usage: %s [ -sptn ] [ -i interface ] [expression]\n",
278 program_name);
279 exit(1);
280 }
281
282 /* VARARGS */
283 static void
error(const char * fmt,...)284 error(const char *fmt, ...)
285 {
286 va_list ap;
287
288 (void)fprintf(stderr, "%s: ", program_name);
289 va_start(ap, fmt);
290 (void)vfprintf(stderr, fmt, ap);
291 va_end(ap);
292 if (*fmt) {
293 fmt += strlen(fmt);
294 if (fmt[-1] != '\n')
295 (void)fputc('\n', stderr);
296 }
297 exit(1);
298 /* NOTREACHED */
299 }
300
301 /* VARARGS */
302 static void
warning(const char * fmt,...)303 warning(const char *fmt, ...)
304 {
305 va_list ap;
306
307 (void)fprintf(stderr, "%s: WARNING: ", program_name);
308 va_start(ap, fmt);
309 (void)vfprintf(stderr, fmt, ap);
310 va_end(ap);
311 if (*fmt) {
312 fmt += strlen(fmt);
313 if (fmt[-1] != '\n')
314 (void)fputc('\n', stderr);
315 }
316 }
317
318 /*
319 * Copy arg vector into a new buffer, concatenating arguments with spaces.
320 */
321 static char *
copy_argv(register char ** argv)322 copy_argv(register char **argv)
323 {
324 register char **p;
325 register u_int len = 0;
326 char *buf;
327 char *src, *dst;
328
329 p = argv;
330 if (*p == 0)
331 return 0;
332
333 while (*p)
334 len += strlen(*p++) + 1;
335
336 buf = (char *)malloc(len);
337 if (buf == NULL)
338 error("copy_argv: malloc");
339
340 p = argv;
341 dst = buf;
342 while ((src = *p++) != NULL) {
343 while ((*dst++ = *src++) != '\0')
344 ;
345 dst[-1] = ' ';
346 }
347 dst[-1] = '\0';
348
349 return buf;
350 }
351