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[] _U_ =
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 static const char rcsid[] _U_ =
27 "@(#) $Header: /tcpdump/master/libpcap/filtertest.c,v 1.2 2005-08-08 17:50:13 guy Exp $ (LBL)";
28 #endif
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include <pcap.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <stdarg.h>
39 #include <unistd.h>
40 #include <fcntl.h>
41 #include <errno.h>
42 #include <arpa/inet.h>
43 #include <sys/types.h>
44 #include <sys/stat.h>
45
46 #ifndef HAVE___ATTRIBUTE__
47 #define __attribute__(x)
48 #endif
49
50 static char *program_name;
51
52 /* Forwards */
53 static void usage(void) __attribute__((noreturn));
54 static void error(const char *, ...)
55 __attribute__((noreturn, format (printf, 1, 2)));
56
57 extern int optind;
58 extern int opterr;
59 extern char *optarg;
60
61 /*
62 * On Windows, we need to open the file in binary mode, so that
63 * we get all the bytes specified by the size we get from "fstat()".
64 * On UNIX, that's not necessary. O_BINARY is defined on Windows;
65 * we define it as 0 if it's not defined, so it does nothing.
66 */
67 #ifndef O_BINARY
68 #define O_BINARY 0
69 #endif
70
71 static char *
read_infile(char * fname)72 read_infile(char *fname)
73 {
74 register int i, fd, cc;
75 register char *cp;
76 struct stat buf;
77
78 fd = open(fname, O_RDONLY|O_BINARY);
79 if (fd < 0)
80 error("can't open %s: %s", fname, pcap_strerror(errno));
81
82 if (fstat(fd, &buf) < 0)
83 error("can't stat %s: %s", fname, pcap_strerror(errno));
84
85 cp = malloc((u_int)buf.st_size + 1);
86 if (cp == NULL)
87 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
88 fname, pcap_strerror(errno));
89 cc = read(fd, cp, (u_int)buf.st_size);
90 if (cc < 0)
91 error("read %s: %s", fname, pcap_strerror(errno));
92 if (cc != buf.st_size)
93 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
94
95 close(fd);
96 /* replace "# comment" with spaces */
97 for (i = 0; i < cc; i++) {
98 if (cp[i] == '#')
99 while (i < cc && cp[i] != '\n')
100 cp[i++] = ' ';
101 }
102 cp[cc] = '\0';
103 return (cp);
104 }
105
106 /* VARARGS */
107 static void
error(const char * fmt,...)108 error(const char *fmt, ...)
109 {
110 va_list ap;
111
112 (void)fprintf(stderr, "%s: ", program_name);
113 va_start(ap, fmt);
114 (void)vfprintf(stderr, fmt, ap);
115 va_end(ap);
116 if (*fmt) {
117 fmt += strlen(fmt);
118 if (fmt[-1] != '\n')
119 (void)fputc('\n', stderr);
120 }
121 exit(1);
122 /* NOTREACHED */
123 }
124
125 /*
126 * Copy arg vector into a new buffer, concatenating arguments with spaces.
127 */
128 static char *
copy_argv(register char ** argv)129 copy_argv(register char **argv)
130 {
131 register char **p;
132 register u_int len = 0;
133 char *buf;
134 char *src, *dst;
135
136 p = argv;
137 if (*p == 0)
138 return 0;
139
140 while (*p)
141 len += strlen(*p++) + 1;
142
143 buf = (char *)malloc(len);
144 if (buf == NULL)
145 error("copy_argv: malloc");
146
147 p = argv;
148 dst = buf;
149 while ((src = *p++) != NULL) {
150 while ((*dst++ = *src++) != '\0')
151 ;
152 dst[-1] = ' ';
153 }
154 dst[-1] = '\0';
155
156 return buf;
157 }
158
159 int
main(int argc,char ** argv)160 main(int argc, char **argv)
161 {
162 char *cp;
163 int op;
164 int dflag;
165 char *infile;
166 int Oflag;
167 long snaplen;
168 int dlt;
169 bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
170 char *cmdbuf;
171 pcap_t *pd;
172 struct bpf_program fcode;
173
174 #ifdef WIN32
175 if(wsockinit() != 0) return 1;
176 #endif /* WIN32 */
177
178 dflag = 1;
179 infile = NULL;
180 Oflag = 1;
181 snaplen = 68;
182
183 if ((cp = strrchr(argv[0], '/')) != NULL)
184 program_name = cp + 1;
185 else
186 program_name = argv[0];
187
188 opterr = 0;
189 while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
190 switch (op) {
191
192 case 'd':
193 ++dflag;
194 break;
195
196 case 'F':
197 infile = optarg;
198 break;
199
200 case 'O':
201 Oflag = 0;
202 break;
203
204 case 'm': {
205 in_addr_t addr;
206
207 addr = inet_addr(optarg);
208 if (addr == INADDR_NONE)
209 error("invalid netmask %s", optarg);
210 netmask = addr;
211 break;
212 }
213
214 case 's': {
215 char *end;
216
217 snaplen = strtol(optarg, &end, 0);
218 if (optarg == end || *end != '\0'
219 || snaplen < 0 || snaplen > 65535)
220 error("invalid snaplen %s", optarg);
221 else if (snaplen == 0)
222 snaplen = 65535;
223 break;
224 }
225
226 default:
227 usage();
228 /* NOTREACHED */
229 }
230 }
231
232 if (optind >= argc) {
233 usage();
234 /* NOTREACHED */
235 }
236
237 dlt = pcap_datalink_name_to_val(argv[optind]);
238 if (dlt < 0)
239 error("invalid data link type %s", argv[optind]);
240
241 if (infile)
242 cmdbuf = read_infile(infile);
243 else
244 cmdbuf = copy_argv(&argv[optind+1]);
245
246 pd = pcap_open_dead(dlt, snaplen);
247 if (pd == NULL)
248 error("Can't open fake pcap_t");
249
250 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
251 error("%s", pcap_geterr(pd));
252 bpf_dump(&fcode, dflag);
253 pcap_close(pd);
254 exit(0);
255 }
256
257 static void
usage(void)258 usage(void)
259 {
260 (void)fprintf(stderr, "%s, with %s\n", program_name,
261 pcap_lib_version());
262 (void)fprintf(stderr,
263 "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
264 program_name);
265 exit(1);
266 }
267