The Tcpdump Group git mirrors - libpcap/blob - testprogs/capturetest.c

   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 <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <stdarg.h>
  34 #include <limits.h>
  35 #ifdef _WIN32
  36   #include "getopt.h"
  37 #else
  38   #include <unistd.h>
  39 #endif
  40 #include <errno.h>
  41 #ifndef _WIN32
  42   #include <signal.h>
  43 #endif
  44 #include <sys/types.h>
  45
  46 #include <pcap.h>
  47
  48 #include "pcap/funcattrs.h"
  49
  50 #ifdef _WIN32
  51   #include "portability.h"
  52 #endif
  53
  54 static char *program_name;
  55
  56 /* Forwards */
  57 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
  58 static void PCAP_NORETURN usage(void);
  59 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  60 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  61 static char *copy_argv(char **);
  62
  63 static pcap_t *pd;
  64 #ifndef _WIN32
  65 static int breaksigint = 0;
  66 #endif
  67
  68 #ifndef _WIN32
  69 static void
  70 sigint_handler(int signum _U_)
  71 {
  72         if (breaksigint)
  73                 pcap_breakloop(pd);
  74 }
  75 #endif
  76
  77 #ifdef _WIN32
  78 /*
  79  * We don't have UN*X-style signals, so we don't have anything to test.
  80  */
  81 #define B_OPTION        ""
  82 #define R_OPTION        ""
  83 #define S_OPTION        ""
  84 #else
  85 /*
  86  * We do have UN*X-style signals (we assume that "not Windows" means "UN*X").
  87  */
  88 #define B_OPTION        "b"
  89 #define R_OPTION        "r"
  90 #define S_OPTION        "s"
  91 #endif
  92
  93 #define COMMAND_OPTIONS B_OPTION "i:mn" R_OPTION S_OPTION "t:"
  94 #define USAGE_OPTIONS   "-" B_OPTION "mn" R_OPTION S_OPTION
  95
  96 int
  97 main(int argc, char **argv)
  98 {
  99         register int op;
 100         register char *cp, *cmdbuf, *device;
 101         long longarg;
 102         char *p;
 103         int timeout = 1000;
 104         int immediate = 0;
 105         int nonblock = 0;
 106 #ifndef _WIN32
 107         int sigrestart = 0;
 108         int catchsigint = 0;
 109 #endif
 110         pcap_if_t *devlist;
 111         bpf_u_int32 localnet, netmask;
 112         struct bpf_program fcode;
 113         char ebuf[PCAP_ERRBUF_SIZE];
 114         int status;
 115         int packet_count;
 116
 117         device = NULL;
 118         if ((cp = strrchr(argv[0], '/')) != NULL)
 119                 program_name = cp + 1;
 120         else
 121                 program_name = argv[0];
 122
 123         opterr = 0;
 124         while ((op = getopt(argc, argv, COMMAND_OPTIONS)) != -1) {
 125                 switch (op) {
 126
 127 #ifndef _WIN32
 128                 case 'b':
 129                         breaksigint = 1;
 130                         break;
 131 #endif
 132
 133                 case 'i':
 134                         device = optarg;
 135                         break;
 136
 137                 case 'm':
 138                         immediate = 1;
 139                         break;
 140
 141                 case 'n':
 142                         nonblock = 1;
 143                         break;
 144
 145 #ifndef _WIN32
 146                 case 'r':
 147                         sigrestart = 1;
 148                         break;
 149
 150                 case 's':
 151                         catchsigint = 1;
 152                         break;
 153 #endif
 154
 155                 case 't':
 156                         longarg = strtol(optarg, &p, 10);
 157                         if (p == optarg || *p != '\0') {
 158                                 error("Timeout value \"%s\" is not a number",
 159                                     optarg);
 160                                 /* NOTREACHED */
 161                         }
 162                         if (longarg < 0) {
 163                                 error("Timeout value %ld is negative", longarg);
 164                                 /* NOTREACHED */
 165                         }
 166                         if (longarg > INT_MAX) {
 167                                 error("Timeout value %ld is too large (> %d)",
 168                                     longarg, INT_MAX);
 169                                 /* NOTREACHED */
 170                         }
 171                         timeout = (int)longarg;
 172                         break;
 173
 174                 default:
 175                         usage();
 176                         /* NOTREACHED */
 177                 }
 178         }
 179
 180         if (device == NULL) {
 181                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 182                         error("%s", ebuf);
 183                 if (devlist == NULL)
 184                         error("no interfaces available for capture");
 185                 device = strdup(devlist->name);
 186                 pcap_freealldevs(devlist);
 187         }
 188         *ebuf = '\0';
 189
 190 #ifndef _WIN32
 191         /*
 192          * If we were told to catch SIGINT, do so.
 193          */
 194         if (catchsigint) {
 195                 struct sigaction action;
 196
 197                 action.sa_handler = sigint_handler;
 198                 sigemptyset(&action.sa_mask);
 199
 200                 /*
 201                  * Should SIGINT interrupt, or restart, system calls?
 202                  */
 203                 action.sa_flags = sigrestart ? SA_RESTART : 0;
 204
 205                 if (sigaction(SIGINT, &action, NULL) == -1)
 206                         error("Can't catch SIGINT: %s\n",
 207                             strerror(errno));
 208         }
 209 #endif
 210
 211         pd = pcap_create(device, ebuf);
 212         if (pd == NULL)
 213                 error("%s", ebuf);
 214         status = pcap_set_snaplen(pd, 65535);
 215         if (status != 0)
 216                 error("%s: pcap_set_snaplen failed: %s",
 217                             device, pcap_statustostr(status));
 218         if (immediate) {
 219                 status = pcap_set_immediate_mode(pd, 1);
 220                 if (status != 0)
 221                         error("%s: pcap_set_immediate_mode failed: %s",
 222                             device, pcap_statustostr(status));
 223         }
 224         status = pcap_set_timeout(pd, timeout);
 225         if (status != 0)
 226                 error("%s: pcap_set_timeout failed: %s",
 227                     device, pcap_statustostr(status));
 228         status = pcap_activate(pd);
 229         if (status < 0) {
 230                 /*
 231                  * pcap_activate() failed.
 232                  */
 233                 error("%s: %s\n(%s)", device,
 234                     pcap_statustostr(status), pcap_geterr(pd));
 235         } else if (status > 0) {
 236                 /*
 237                  * pcap_activate() succeeded, but it's warning us
 238                  * of a problem it had.
 239                  */
 240                 warning("%s: %s\n(%s)", device,
 241                     pcap_statustostr(status), pcap_geterr(pd));
 242         }
 243         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 244                 localnet = 0;
 245                 netmask = 0;
 246                 warning("%s", ebuf);
 247         }
 248         cmdbuf = copy_argv(&argv[optind]);
 249
 250         if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
 251                 error("%s", pcap_geterr(pd));
 252
 253         if (pcap_setfilter(pd, &fcode) < 0)
 254                 error("%s", pcap_geterr(pd));
 255         if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
 256                 error("pcap_setnonblock failed: %s", ebuf);
 257         printf("Listening on %s\n", device);
 258         for (;;) {
 259                 packet_count = 0;
 260                 status = pcap_dispatch(pd, -1, countme,
 261                     (u_char *)&packet_count);
 262                 if (status < 0)
 263                         break;
 264                 if (status != 0) {
 265                         printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
 266                             status, packet_count);
 267                         struct pcap_stat ps;
 268                         if (pcap_stats(pd, &ps) < 0) {
 269                                 (void)fprintf(stderr, "pcap_stats: %s\n",
 270                                     pcap_geterr(pd));
 271                         } else {
 272                                 printf("%d ps_recv, %d ps_drop, %d ps_ifdrop\n",
 273                                     ps.ps_recv, ps.ps_drop, ps.ps_ifdrop);
 274                         }
 275                 }
 276         }
 277         if (status == -2) {
 278                 /*
 279                  * We got interrupted, so perhaps we didn't
 280                  * manage to finish a line we were printing.
 281                  * Print an extra newline, just in case.
 282                  */
 283                 putchar('\n');
 284                 printf("Broken out of loop from SIGINT handler\n");
 285         }
 286         (void)fflush(stdout);
 287         if (status == -1) {
 288                 /*
 289                  * Error.  Report it.
 290                  */
 291                 (void)fprintf(stderr, "%s: pcap_dispatch: %s\n",
 292                     program_name, pcap_geterr(pd));
 293         }
 294         pcap_close(pd);
 295         pcap_freecode(&fcode);
 296         free(cmdbuf);
 297         exit(status == -1 ? 1 : 0);
 298 }
 299
 300 static void
 301 countme(u_char *user, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
 302 {
 303         int *counterp = (int *)user;
 304
 305         (*counterp)++;
 306 }
 307
 308 static void
 309 usage(void)
 310 {
 311         (void)fprintf(stderr, "Usage: %s [ " USAGE_OPTIONS " ] [ -i interface ] [ -t timeout] [expression]\n",
 312             program_name);
 313         exit(1);
 314 }
 315
 316 /* VARARGS */
 317 static void
 318 error(const char *fmt, ...)
 319 {
 320         va_list ap;
 321
 322         (void)fprintf(stderr, "%s: ", program_name);
 323         va_start(ap, fmt);
 324         (void)vfprintf(stderr, fmt, ap);
 325         va_end(ap);
 326         if (*fmt) {
 327                 fmt += strlen(fmt);
 328                 if (fmt[-1] != '\n')
 329                         (void)fputc('\n', stderr);
 330         }
 331         exit(1);
 332         /* NOTREACHED */
 333 }
 334
 335 /* VARARGS */
 336 static void
 337 warning(const char *fmt, ...)
 338 {
 339         va_list ap;
 340
 341         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 342         va_start(ap, fmt);
 343         (void)vfprintf(stderr, fmt, ap);
 344         va_end(ap);
 345         if (*fmt) {
 346                 fmt += strlen(fmt);
 347                 if (fmt[-1] != '\n')
 348                         (void)fputc('\n', stderr);
 349         }
 350 }
 351
 352 /*
 353  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 354  */
 355 static char *
 356 copy_argv(register char **argv)
 357 {
 358         register char **p;
 359         register size_t len = 0;
 360         char *buf;
 361         char *src, *dst;
 362
 363         p = argv;
 364         if (*p == 0)
 365                 return 0;
 366
 367         while (*p)
 368                 len += strlen(*p++) + 1;
 369
 370         buf = (char *)malloc(len);
 371         if (buf == NULL)
 372                 error("copy_argv: malloc");
 373
 374         p = argv;
 375         dst = buf;
 376         while ((src = *p++) != NULL) {
 377                 while ((*dst++ = *src++) != '\0')
 378                         ;
 379                 dst[-1] = ' ';
 380         }
 381         dst[-1] = '\0';
 382
 383         return buf;
 384 }