Home | History | Annotate | Download | only in testprogs 
      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 #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 #ifdef _WIN32
     40   #include "getopt.h"
     41   #include "unix.h"
     42 #else
     43   #include <unistd.h>
     44 #endif
     45 #include <fcntl.h>
     46 #include <errno.h>
     47 #ifdef _WIN32
     48   #include <winsock2.h>
     49   #include <ws2tcpip.h>
     50 #else
     51   #include <sys/socket.h>
     52   #include <arpa/inet.h>
     53 #endif
     54 #include <sys/types.h>
     55 #include <sys/stat.h>
     56 
     57 #include "pcap/funcattrs.h"
     58 
     59 #ifdef BDEBUG
     60 /*
     61  * We have pcap_set_optimizer_debug() and pcap_set_print_dot_graph() in
     62  * libpcap; declare them (they're not declared by any libpcap header,
     63  * because they're special hacks, only available if libpcap was configured
     64  * to include them, and only intended for use by libpcap developers trying
     65  * to debug the optimizer for filter expressions).
     66  */
     67 PCAP_API void pcap_set_optimizer_debug(int);
     68 PCAP_API void pcap_set_print_dot_graph(int);
     69 #endif
     70 
     71 static char *program_name;
     72 
     73 /* Forwards */
     74 static void PCAP_NORETURN usage(void);
     75 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
     76 static void warn(const char *, ...) PCAP_PRINTFLIKE(1, 2);
     77 
     78 /*
     79  * On Windows, we need to open the file in binary mode, so that
     80  * we get all the bytes specified by the size we get from "fstat()".
     81  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
     82  * we define it as 0 if it's not defined, so it does nothing.
     83  */
     84 #ifndef O_BINARY
     85 #define O_BINARY	0
     86 #endif
     87 
     88 static char *
     89 read_infile(char *fname)
     90 {
     91 	register int i, fd, cc;
     92 	register char *cp;
     93 	struct stat buf;
     94 
     95 	fd = open(fname, O_RDONLY|O_BINARY);
     96 	if (fd < 0)
     97 		error("can't open %s: %s", fname, pcap_strerror(errno));
     98 
     99 	if (fstat(fd, &buf) < 0)
    100 		error("can't stat %s: %s", fname, pcap_strerror(errno));
    101 
    102 	cp = malloc((u_int)buf.st_size + 1);
    103 	if (cp == NULL)
    104 		error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
    105 			fname, pcap_strerror(errno));
    106 	cc = read(fd, cp, (u_int)buf.st_size);
    107 	if (cc < 0)
    108 		error("read %s: %s", fname, pcap_strerror(errno));
    109 	if (cc != buf.st_size)
    110 		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
    111 
    112 	close(fd);
    113 	/* replace "# comment" with spaces */
    114 	for (i = 0; i < cc; i++) {
    115 		if (cp[i] == '#')
    116 			while (i < cc && cp[i] != '\n')
    117 				cp[i++] = ' ';
    118 	}
    119 	cp[cc] = '\0';
    120 	return (cp);
    121 }
    122 
    123 /* VARARGS */
    124 static void
    125 error(const char *fmt, ...)
    126 {
    127 	va_list ap;
    128 
    129 	(void)fprintf(stderr, "%s: ", program_name);
    130 	va_start(ap, fmt);
    131 	(void)vfprintf(stderr, fmt, ap);
    132 	va_end(ap);
    133 	if (*fmt) {
    134 		fmt += strlen(fmt);
    135 		if (fmt[-1] != '\n')
    136 			(void)fputc('\n', stderr);
    137 	}
    138 	exit(1);
    139 	/* NOTREACHED */
    140 }
    141 
    142 /* VARARGS */
    143 static void
    144 warn(const char *fmt, ...)
    145 {
    146 	va_list ap;
    147 
    148 	(void)fprintf(stderr, "%s: WARNING: ", program_name);
    149 	va_start(ap, fmt);
    150 	(void)vfprintf(stderr, fmt, ap);
    151 	va_end(ap);
    152 	if (*fmt) {
    153 		fmt += strlen(fmt);
    154 		if (fmt[-1] != '\n')
    155 			(void)fputc('\n', stderr);
    156 	}
    157 }
    158 
    159 /*
    160  * Copy arg vector into a new buffer, concatenating arguments with spaces.
    161  */
    162 static char *
    163 copy_argv(register char **argv)
    164 {
    165 	register char **p;
    166 	register u_int len = 0;
    167 	char *buf;
    168 	char *src, *dst;
    169 
    170 	p = argv;
    171 	if (*p == 0)
    172 		return 0;
    173 
    174 	while (*p)
    175 		len += strlen(*p++) + 1;
    176 
    177 	buf = (char *)malloc(len);
    178 	if (buf == NULL)
    179 		error("copy_argv: malloc");
    180 
    181 	p = argv;
    182 	dst = buf;
    183 	while ((src = *p++) != NULL) {
    184 		while ((*dst++ = *src++) != '\0')
    185 			;
    186 		dst[-1] = ' ';
    187 	}
    188 	dst[-1] = '\0';
    189 
    190 	return buf;
    191 }
    192 
    193 int
    194 main(int argc, char **argv)
    195 {
    196 	char *cp;
    197 	int op;
    198 	int dflag;
    199 	int gflag;
    200 	char *infile;
    201 	int Oflag;
    202 	long snaplen;
    203 	char *p;
    204 	int dlt;
    205 	int have_fcode = 0;
    206 	bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
    207 	char *cmdbuf;
    208 	pcap_t *pd;
    209 	struct bpf_program fcode;
    210 
    211 #ifdef _WIN32
    212 	if (pcap_wsockinit() != 0)
    213 		return 1;
    214 #endif /* _WIN32 */
    215 
    216 	dflag = 1;
    217 	gflag = 0;
    218 
    219 	infile = NULL;
    220 	Oflag = 1;
    221 	snaplen = 68;
    222 
    223 	if ((cp = strrchr(argv[0], '/')) != NULL)
    224 		program_name = cp + 1;
    225 	else
    226 		program_name = argv[0];
    227 
    228 	opterr = 0;
    229 	while ((op = getopt(argc, argv, "dF:gm:Os:")) != -1) {
    230 		switch (op) {
    231 
    232 		case 'd':
    233 			++dflag;
    234 			break;
    235 
    236 		case 'g':
    237 #ifdef BDEBUG
    238 			++gflag;
    239 #else
    240 			error("libpcap and filtertest not built with optimizer debugging enabled");
    241 #endif
    242 			break;
    243 
    244 		case 'F':
    245 			infile = optarg;
    246 			break;
    247 
    248 		case 'O':
    249 			Oflag = 0;
    250 			break;
    251 
    252 		case 'm': {
    253 			bpf_u_int32 addr;
    254 
    255 			switch (inet_pton(AF_INET, optarg, &addr)) {
    256 
    257 			case 0:
    258 				error("invalid netmask %s", optarg);
    259 				break;
    260 
    261 			case -1:
    262 				error("invalid netmask %s: %s", optarg,
    263 				    pcap_strerror(errno));
    264 				break;
    265 
    266 			case 1:
    267 				netmask = addr;
    268 				break;
    269 			}
    270 			break;
    271 		}
    272 
    273 		case 's': {
    274 			char *end;
    275 
    276 			snaplen = strtol(optarg, &end, 0);
    277 			if (optarg == end || *end != '\0'
    278 			    || snaplen < 0 || snaplen > 65535)
    279 				error("invalid snaplen %s", optarg);
    280 			else if (snaplen == 0)
    281 				snaplen = 65535;
    282 			break;
    283 		}
    284 
    285 		default:
    286 			usage();
    287 			/* NOTREACHED */
    288 		}
    289 	}
    290 
    291 	if (optind >= argc) {
    292 		usage();
    293 		/* NOTREACHED */
    294 	}
    295 
    296 	dlt = pcap_datalink_name_to_val(argv[optind]);
    297 	if (dlt < 0) {
    298 		dlt = (int)strtol(argv[optind], &p, 10);
    299 		if (p == argv[optind] || *p != '\0')
    300 			error("invalid data link type %s", argv[optind]);
    301 	}
    302 
    303 	if (infile)
    304 		cmdbuf = read_infile(infile);
    305 	else
    306 		cmdbuf = copy_argv(&argv[optind+1]);
    307 
    308 #ifdef BDEBUG
    309 	pcap_set_optimizer_debug(dflag);
    310 	pcap_set_print_dot_graph(gflag);
    311 #endif
    312 
    313 	pd = pcap_open_dead(dlt, snaplen);
    314 	if (pd == NULL)
    315 		error("Can't open fake pcap_t");
    316 
    317 	if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
    318 		error("%s", pcap_geterr(pd));
    319 
    320 	have_fcode = 1;
    321 	if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
    322 		warn("Filter doesn't pass validation");
    323 
    324 #ifdef BDEBUG
    325 	if (cmdbuf != NULL) {
    326 		// replace line feed with space
    327 		for (cp = cmdbuf; *cp != '\0'; ++cp) {
    328 			if (*cp == '\r' || *cp == '\n') {
    329 				*cp = ' ';
    330 			}
    331 		}
    332 		// only show machine code if BDEBUG defined, since dflag > 3
    333 		printf("machine codes for filter: %s\n", cmdbuf);
    334 	} else
    335 		printf("machine codes for empty filter:\n");
    336 #endif
    337 
    338 	bpf_dump(&fcode, dflag);
    339 	free(cmdbuf);
    340 	if (have_fcode)
    341 		pcap_freecode (&fcode);
    342 	pcap_close(pd);
    343 	exit(0);
    344 }
    345 
    346 static void
    347 usage(void)
    348 {
    349 	(void)fprintf(stderr, "%s, with %s\n", program_name,
    350 	    pcap_lib_version());
    351 	(void)fprintf(stderr,
    352 #ifdef BDEBUG
    353 	    "Usage: %s [-dgO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
    354 #else
    355 	    "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
    356 #endif
    357 	    program_name);
    358 	exit(1);
    359 }
    360