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 #include "varattrs.h"
23
24 #ifndef lint
25 static const char copyright[] _U_ =
26 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
27 The Regents of the University of California. All rights reserved.\n";
28 #endif
29
30 #include <pcap.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <stdarg.h>
35 #ifdef _WIN32
36 #include "getopt.h"
37 #else
38 #include <unistd.h>
39 #endif
40 #include <errno.h>
41
42 #include "pcap/funcattrs.h"
43
44 #ifdef _WIN32
45 #include "portability.h"
46 #endif
47
48 #define MAXIMUM_SNAPLEN 262144
49
50 static char *program_name;
51
52 /* Forwards */
53 static void PCAP_NORETURN usage(void);
54 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
55 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
56
57 int
main(int argc,char ** argv)58 main(int argc, char **argv)
59 {
60 register int op;
61 register char *cp, *device;
62 int dorfmon, dopromisc, snaplen, useactivate, bufsize;
63 char ebuf[PCAP_ERRBUF_SIZE];
64 pcap_if_t *devlist;
65 pcap_t *pd;
66 int status = 0;
67
68 device = NULL;
69 dorfmon = 0;
70 dopromisc = 0;
71 snaplen = MAXIMUM_SNAPLEN;
72 bufsize = 0;
73 useactivate = 0;
74 if ((cp = strrchr(argv[0], '/')) != NULL)
75 program_name = cp + 1;
76 else
77 program_name = argv[0];
78
79 opterr = 0;
80 while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
81 switch (op) {
82
83 case 'i':
84 device = strdup(optarg);
85 break;
86
87 case 'I':
88 dorfmon = 1;
89 useactivate = 1; /* required for rfmon */
90 break;
91
92 case 'p':
93 dopromisc = 1;
94 break;
95
96 case 's': {
97 char *end;
98 long long_snaplen;
99
100 long_snaplen = strtol(optarg, &end, 0);
101 if (optarg == end || *end != '\0'
102 || long_snaplen < 0
103 || long_snaplen > MAXIMUM_SNAPLEN)
104 error("invalid snaplen %s", optarg);
105 else {
106 if (snaplen == 0)
107 snaplen = MAXIMUM_SNAPLEN;
108 else
109 snaplen = (int)long_snaplen;
110 }
111 break;
112 }
113
114 case 'B':
115 bufsize = atoi(optarg)*1024;
116 if (bufsize <= 0)
117 error("invalid packet buffer size %s", optarg);
118 useactivate = 1; /* required for bufsize */
119 break;
120
121 case 'a':
122 useactivate = 1;
123 break;
124
125 default:
126 usage();
127 /* NOTREACHED */
128 }
129 }
130
131 if (device == NULL) {
132 if (pcap_findalldevs(&devlist, ebuf) == -1)
133 error("%s", ebuf);
134 if (devlist == NULL)
135 error("no interfaces available for capture");
136 device = strdup(devlist->name);
137 pcap_freealldevs(devlist);
138 }
139 if (useactivate) {
140 pd = pcap_create(device, ebuf);
141 if (pd == NULL)
142 error("%s: pcap_create failed: %s", device, ebuf);
143 status = pcap_set_snaplen(pd, snaplen);
144 if (status != 0)
145 error("%s: pcap_set_snaplen failed: %s",
146 device, pcap_statustostr(status));
147 if (dopromisc) {
148 status = pcap_set_promisc(pd, 1);
149 if (status != 0)
150 error("%s: pcap_set_promisc failed: %s",
151 device, pcap_statustostr(status));
152 }
153 if (dorfmon) {
154 status = pcap_set_rfmon(pd, 1);
155 if (status != 0)
156 error("%s: pcap_set_rfmon failed: %s",
157 device, pcap_statustostr(status));
158 }
159 status = pcap_set_timeout(pd, 1000);
160 if (status != 0)
161 error("%s: pcap_set_timeout failed: %s",
162 device, pcap_statustostr(status));
163 if (bufsize != 0) {
164 status = pcap_set_buffer_size(pd, bufsize);
165 if (status != 0)
166 error("%s: pcap_set_buffer_size failed: %s",
167 device, pcap_statustostr(status));
168 }
169 status = pcap_activate(pd);
170 if (status < 0) {
171 /*
172 * pcap_activate() failed.
173 */
174 error("%s: %s\n(%s)", device,
175 pcap_statustostr(status), pcap_geterr(pd));
176 } else if (status > 0) {
177 /*
178 * pcap_activate() succeeded, but it's warning us
179 * of a problem it had.
180 */
181 warning("%s: %s\n(%s)", device,
182 pcap_statustostr(status), pcap_geterr(pd));
183 } else
184 printf("%s opened successfully\n", device);
185 } else {
186 *ebuf = '\0';
187 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
188 if (pd == NULL)
189 error("%s", ebuf);
190 else if (*ebuf)
191 warning("%s", ebuf);
192 else
193 printf("%s opened successfully\n", device);
194 }
195 free(device);
196 pcap_close(pd);
197 exit(status < 0 ? 1 : 0);
198 }
199
200 static void
usage(void)201 usage(void)
202 {
203 (void)fprintf(stderr,
204 "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
205 program_name);
206 exit(1);
207 }
208
209 /* VARARGS */
210 static void
error(const char * fmt,...)211 error(const char *fmt, ...)
212 {
213 va_list ap;
214
215 (void)fprintf(stderr, "%s: ", program_name);
216 va_start(ap, fmt);
217 (void)vfprintf(stderr, fmt, ap);
218 va_end(ap);
219 if (*fmt) {
220 fmt += strlen(fmt);
221 if (fmt[-1] != '\n')
222 (void)fputc('\n', stderr);
223 }
224 exit(1);
225 /* NOTREACHED */
226 }
227
228 /* VARARGS */
229 static void
warning(const char * fmt,...)230 warning(const char *fmt, ...)
231 {
232 va_list ap;
233
234 (void)fprintf(stderr, "%s: WARNING: ", program_name);
235 va_start(ap, fmt);
236 (void)vfprintf(stderr, fmt, ap);
237 va_end(ap);
238 if (*fmt) {
239 fmt += strlen(fmt);
240 if (fmt[-1] != '\n')
241 (void)fputc('\n', stderr);
242 }
243 }
244