The Tcpdump Group git mirrors - libpcap/blob - tests/threadsignaltest.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 #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 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <stdarg.h>
  32 #include <limits.h>
  33 #ifdef _WIN32
  34   #include <winsock2.h>
  35   #include <windows.h>
  36
  37   #define THREAD_HANDLE                 HANDLE
  38   #define THREAD_FUNC_RETURN_TYPE       int
  39
  40   #include "getopt.h"
  41 #else
  42   #include <pthread.h>
  43   #include <signal.h>
  44   #include <unistd.h>
  45
  46   #define THREAD_HANDLE                 pthread_t
  47   #define THREAD_FUNC_RETURN_TYPE       void *
  48 #endif
  49 #include <errno.h>
  50 #include <sys/types.h>
  51
  52 #include <pcap.h>
  53
  54 #include "pcap/funcattrs.h"
  55
  56 #ifdef _WIN32
  57   #include "portability.h"
  58 #endif
  59
  60 static char *program_name;
  61
  62 /* Forwards */
  63 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
  64 static void PCAP_NORETURN usage(void);
  65 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  66 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  67 static char *copy_argv(char **);
  68
  69 static pcap_t *pd;
  70
  71 #ifdef _WIN32
  72 /*
  73  * Generate a string for a Win32-specific error (i.e. an error generated when
  74  * calling a Win32 API).
  75  * For errors occurred during standard C calls, we still use pcap_strerror()
  76  */
  77 #define ERRBUF_SIZE     1024
  78 static const char *
  79 win32_strerror(DWORD error)
  80 {
  81   static char errbuf[ERRBUF_SIZE+1];
  82   size_t errlen;
  83
  84   FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
  85                 ERRBUF_SIZE, NULL);
  86
  87   /*
  88    * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
  89    * message.  Get rid of it.
  90    */
  91   errlen = strlen(errbuf);
  92   if (errlen >= 2) {
  93     errbuf[errlen - 1] = '\0';
  94     errbuf[errlen - 2] = '\0';
  95     errlen -= 2;
  96   }
  97   return errbuf;
  98 }
  99 #else
 100 static void
 101 catch_sigusr1(int sig _U_)
 102 {
 103         printf("Got SIGUSR1\n");
 104 }
 105 #endif
 106
 107 static void
 108 sleep_secs(int secs)
 109 {
 110 #ifdef _WIN32
 111         Sleep(secs*1000);
 112 #else
 113         unsigned secs_remaining;
 114
 115         if (secs <= 0)
 116                 return;
 117         secs_remaining = secs;
 118         while (secs_remaining != 0)
 119                 secs_remaining = sleep(secs_remaining);
 120 #endif
 121 }
 122
 123 static THREAD_FUNC_RETURN_TYPE
 124 capture_thread_func(void *arg)
 125 {
 126         char *device = arg;
 127         int packet_count;
 128         int status;
 129 #ifndef _WIN32
 130         struct sigaction action;
 131         sigset_t mask;
 132 #endif
 133
 134 #ifndef _WIN32
 135         sigemptyset(&mask);
 136         action.sa_handler = catch_sigusr1;
 137         action.sa_mask = mask;
 138         action.sa_flags = 0;
 139         if (sigaction(SIGUSR1, &action, NULL) == -1)
 140                 error("Can't catch SIGUSR1: %s", strerror(errno));
 141 #endif
 142
 143         printf("Listening on %s\n", device);
 144         for (;;) {
 145                 packet_count = 0;
 146                 status = pcap_dispatch(pd, -1, countme,
 147                     (u_char *)&packet_count);
 148                 if (status < 0)
 149                         break;
 150                 if (status != 0) {
 151                         printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
 152                             status, packet_count);
 153                 }
 154         }
 155         if (status == -2) {
 156                 /*
 157                  * We got interrupted, so perhaps we didn't
 158                  * manage to finish a line we were printing.
 159                  * Print an extra newline, just in case.
 160                  */
 161                 putchar('\n');
 162                 printf("Loop got broken\n");
 163         }
 164         (void)fflush(stdout);
 165         if (status == -1) {
 166                 /*
 167                  * Error.  Report it.
 168                  */
 169                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 170                     program_name, pcap_geterr(pd));
 171         }
 172         return 0;
 173 }
 174
 175 int
 176 main(int argc, char **argv)
 177 {
 178         register int op;
 179         register char *cp, *cmdbuf, *device;
 180         int immediate = 0;
 181         pcap_if_t *devlist;
 182         bpf_u_int32 localnet, netmask;
 183         struct bpf_program fcode;
 184         char ebuf[PCAP_ERRBUF_SIZE];
 185         int status;
 186         THREAD_HANDLE capture_thread;
 187         void *retval;
 188
 189         device = NULL;
 190         if ((cp = strrchr(argv[0], '/')) != NULL)
 191                 program_name = cp + 1;
 192         else
 193                 program_name = argv[0];
 194
 195         opterr = 0;
 196         while ((op = getopt(argc, argv, "i:")) != -1) {
 197                 switch (op) {
 198
 199                 case 'i':
 200                         device = optarg;
 201                         break;
 202
 203                 default:
 204                         usage();
 205                         /* NOTREACHED */
 206                 }
 207         }
 208
 209         if (device == NULL) {
 210                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 211                         error("%s", ebuf);
 212                 if (devlist == NULL)
 213                         error("no interfaces available for capture");
 214                 device = strdup(devlist->name);
 215                 pcap_freealldevs(devlist);
 216         }
 217         *ebuf = '\0';
 218         pd = pcap_create(device, ebuf);
 219         if (pd == NULL)
 220                 error("%s", ebuf);
 221         status = pcap_set_snaplen(pd, 65535);
 222         if (status != 0)
 223                 error("%s: pcap_set_snaplen failed: %s",
 224                             device, pcap_statustostr(status));
 225         if (immediate) {
 226                 status = pcap_set_immediate_mode(pd, 1);
 227                 if (status != 0)
 228                         error("%s: pcap_set_immediate_mode failed: %s",
 229                             device, pcap_statustostr(status));
 230         }
 231         status = pcap_set_timeout(pd, 5*60*1000);
 232         if (status != 0)
 233                 error("%s: pcap_set_timeout failed: %s",
 234                     device, pcap_statustostr(status));
 235         status = pcap_activate(pd);
 236         if (status < 0) {
 237                 /*
 238                  * pcap_activate() failed.
 239                  */
 240                 error("%s: %s\n(%s)", device,
 241                     pcap_statustostr(status), pcap_geterr(pd));
 242         } else if (status > 0) {
 243                 /*
 244                  * pcap_activate() succeeded, but it's warning us
 245                  * of a problem it had.
 246                  */
 247                 warning("%s: %s\n(%s)", device,
 248                     pcap_statustostr(status), pcap_geterr(pd));
 249         }
 250         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 251                 localnet = 0;
 252                 netmask = 0;
 253                 warning("%s", ebuf);
 254         }
 255         cmdbuf = copy_argv(&argv[optind]);
 256
 257         if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
 258                 error("%s", pcap_geterr(pd));
 259
 260         if (pcap_setfilter(pd, &fcode) < 0)
 261                 error("%s", pcap_geterr(pd));
 262
 263 #ifdef _WIN32
 264         capture_thread = CreateThread(NULL, 0, capture_thread_func, device,
 265             0, NULL);
 266         if (capture_thread == NULL)
 267                 error("Can't create capture thread: %s",
 268                     win32_strerror(GetLastError()));
 269 #else
 270         status = pthread_create(&capture_thread, NULL, capture_thread_func,
 271             device);
 272         if (status != 0)
 273                 error("Can't create capture thread: %s", strerror(status));
 274 #endif
 275         sleep_secs(60);
 276         pcap_breakloop(pd);
 277 #ifdef _WIN32
 278         printf("Setting event\n");
 279         if (!SetEvent(pcap_getevent(pd)))
 280                 error("Can't set event for pcap_t: %s",
 281                     win32_strerror(GetLastError()));
 282         if (WaitForSingleObject(capture_thread, INFINITE) == WAIT_FAILED)
 283                 error("Wait for thread termination failed: %s",
 284                     win32_strerror(GetLastError()));
 285         CloseHandle(capture_thread);
 286 #else
 287         printf("Sending SIGUSR1\n");
 288         status = pthread_kill(capture_thread, SIGUSR1);
 289         if (status != 0)
 290                 warning("Can't interrupt capture thread: %s", strerror(status));
 291         status = pthread_join(capture_thread, &retval);
 292         if (status != 0)
 293                 error("Wait for thread termination failed: %s",
 294                     strerror(status));
 295 #endif
 296
 297         pcap_close(pd);
 298         pcap_freecode(&fcode);
 299         exit(status == -1 ? 1 : 0);
 300 }
 301
 302 static void
 303 countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 304 {
 305         int *counterp = (int *)user;
 306
 307         (*counterp)++;
 308 }
 309
 310 static void
 311 usage(void)
 312 {
 313         (void)fprintf(stderr, "Usage: %s [ -m ] [ -i interface ] [ -t timeout] [expression]\n",
 314             program_name);
 315         exit(1);
 316 }
 317
 318 /* VARARGS */
 319 static void
 320 error(const char *fmt, ...)
 321 {
 322         va_list ap;
 323
 324         (void)fprintf(stderr, "%s: ", program_name);
 325         va_start(ap, fmt);
 326         (void)vfprintf(stderr, fmt, ap);
 327         va_end(ap);
 328         if (*fmt) {
 329                 fmt += strlen(fmt);
 330                 if (fmt[-1] != '\n')
 331                         (void)fputc('\n', stderr);
 332         }
 333         exit(1);
 334         /* NOTREACHED */
 335 }
 336
 337 /* VARARGS */
 338 static void
 339 warning(const char *fmt, ...)
 340 {
 341         va_list ap;
 342
 343         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 344         va_start(ap, fmt);
 345         (void)vfprintf(stderr, fmt, ap);
 346         va_end(ap);
 347         if (*fmt) {
 348                 fmt += strlen(fmt);
 349                 if (fmt[-1] != '\n')
 350                         (void)fputc('\n', stderr);
 351         }
 352 }
 353
 354 /*
 355  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 356  */
 357 static char *
 358 copy_argv(register char **argv)
 359 {
 360         register char **p;
 361         register u_int len = 0;
 362         char *buf;
 363         char *src, *dst;
 364
 365         p = argv;
 366         if (*p == 0)
 367                 return 0;
 368
 369         while (*p)
 370                 len += strlen(*p++) + 1;
 371
 372         buf = (char *)malloc(len);
 373         if (buf == NULL)
 374                 error("copy_argv: malloc");
 375
 376         p = argv;
 377         dst = buf;
 378         while ((src = *p++) != NULL) {
 379                 while ((*dst++ = *src++) != '\0')
 380                         ;
 381                 dst[-1] = ' ';
 382         }
 383         dst[-1] = '\0';
 384
 385         return buf;
 386 }