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
36 #define MAXIMUM_SNAPLEN 65535
37
38 static char *program_name;
39
40 /* Forwards */
41 static void usage(void) __attribute__((noreturn));
42 static void error(const char *, ...);
43 static void warning(const char *, ...);
44
45 extern int optind;
46 extern int opterr;
47 extern char *optarg;
48
49 int
main(int argc,char ** argv)50 main(int argc, char **argv)
51 {
52 register int op;
53 register char *cp, *device;
54 int dorfmon, dopromisc, snaplen, useactivate, bufsize;
55 char ebuf[PCAP_ERRBUF_SIZE];
56 pcap_t *pd;
57 int status = 0;
58
59 device = NULL;
60 dorfmon = 0;
61 dopromisc = 0;
62 snaplen = MAXIMUM_SNAPLEN;
63 bufsize = 0;
64 useactivate = 0;
65 if ((cp = strrchr(argv[0], '/')) != NULL)
66 program_name = cp + 1;
67 else
68 program_name = argv[0];
69
70 opterr = 0;
71 while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
72 switch (op) {
73
74 case 'i':
75 device = optarg;
76 break;
77
78 case 'I':
79 dorfmon = 1;
80 useactivate = 1; /* required for rfmon */
81 break;
82
83 case 'p':
84 dopromisc = 1;
85 break;
86
87 case 's': {
88 char *end;
89
90 snaplen = strtol(optarg, &end, 0);
91 if (optarg == end || *end != '\0'
92 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
93 error("invalid snaplen %s", optarg);
94 else if (snaplen == 0)
95 snaplen = MAXIMUM_SNAPLEN;
96 break;
97 }
98
99 case 'B':
100 bufsize = atoi(optarg)*1024;
101 if (bufsize <= 0)
102 error("invalid packet buffer size %s", optarg);
103 useactivate = 1; /* required for bufsize */
104 break;
105
106 case 'a':
107 useactivate = 1;
108 break;
109
110 default:
111 usage();
112 /* NOTREACHED */
113 }
114 }
115
116 if (useactivate) {
117 pd = pcap_create(device, ebuf);
118 if (pd == NULL)
119 error("%s", ebuf);
120 status = pcap_set_snaplen(pd, snaplen);
121 if (status != 0)
122 error("%s: pcap_set_snaplen failed: %s",
123 device, pcap_statustostr(status));
124 if (dopromisc) {
125 status = pcap_set_promisc(pd, 1);
126 if (status != 0)
127 error("%s: pcap_set_promisc failed: %s",
128 device, pcap_statustostr(status));
129 }
130 if (dorfmon) {
131 status = pcap_set_rfmon(pd, 1);
132 if (status != 0)
133 error("%s: pcap_set_rfmon failed: %s",
134 device, pcap_statustostr(status));
135 }
136 status = pcap_set_timeout(pd, 1000);
137 if (status != 0)
138 error("%s: pcap_set_timeout failed: %s",
139 device, pcap_statustostr(status));
140 if (bufsize != 0) {
141 status = pcap_set_buffer_size(pd, bufsize);
142 if (status != 0)
143 error("%s: pcap_set_buffer_size failed: %s",
144 device, pcap_statustostr(status));
145 }
146 status = pcap_activate(pd);
147 if (status < 0) {
148 /*
149 * pcap_activate() failed.
150 */
151 error("%s: %s\n(%s)", device,
152 pcap_statustostr(status), pcap_geterr(pd));
153 } else if (status > 0) {
154 /*
155 * pcap_activate() succeeded, but it's warning us
156 * of a problem it had.
157 */
158 warning("%s: %s\n(%s)", device,
159 pcap_statustostr(status), pcap_geterr(pd));
160 }
161 } else {
162 *ebuf = '\0';
163 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
164 if (pd == NULL)
165 error("%s", ebuf);
166 else if (*ebuf)
167 warning("%s", ebuf);
168 }
169 pcap_close(pd);
170 exit(status < 0 ? 1 : 0);
171 }
172
173 static void
usage(void)174 usage(void)
175 {
176 (void)fprintf(stderr,
177 "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
178 program_name);
179 exit(1);
180 }
181
182 /* VARARGS */
183 static void
error(const char * fmt,...)184 error(const char *fmt, ...)
185 {
186 va_list ap;
187
188 (void)fprintf(stderr, "%s: ", program_name);
189 va_start(ap, fmt);
190 (void)vfprintf(stderr, fmt, ap);
191 va_end(ap);
192 if (*fmt) {
193 fmt += strlen(fmt);
194 if (fmt[-1] != '\n')
195 (void)fputc('\n', stderr);
196 }
197 exit(1);
198 /* NOTREACHED */
199 }
200
201 /* VARARGS */
202 static void
warning(const char * fmt,...)203 warning(const char *fmt, ...)
204 {
205 va_list ap;
206
207 (void)fprintf(stderr, "%s: WARNING: ", program_name);
208 va_start(ap, fmt);
209 (void)vfprintf(stderr, fmt, ap);
210 va_end(ap);
211 if (*fmt) {
212 fmt += strlen(fmt);
213 if (fmt[-1] != '\n')
214 (void)fputc('\n', stderr);
215 }
216 }
217