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_ARG_TYPE          LPVOID
  39   #define THREAD_FUNC_RETURN_TYPE       DWORD __stdcall
  40
  41   #include "getopt.h"
  42 #else
  43   #include <pthread.h>
  44   #include <signal.h>
  45   #include <unistd.h>
  46
  47   #define THREAD_HANDLE                 pthread_t
  48   #define THREAD_FUNC_ARG_TYPE          void *
  49   #define THREAD_FUNC_RETURN_TYPE       void *
  50 #endif
  51 #include <errno.h>
  52 #include <sys/types.h>
  53
  54 #include <pcap.h>
  55
  56 #include "pcap/funcattrs.h"
  57
  58 #ifdef _WIN32
  59   #include "portability.h"
  60 #endif
  61
  62 static char *program_name;
  63
  64 /* Forwards */
  65 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
  66 static void PCAP_NORETURN usage(void);
  67 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  68 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  69 static char *copy_argv(char **);
  70
  71 static pcap_t *pd;
  72
  73 #ifdef _WIN32
  74 /*
  75  * Generate a string for a Win32-specific error (i.e. an error generated when
  76  * calling a Win32 API).
  77  * For errors occurred during standard C calls, we still use pcap_strerror()
  78  */
  79 #define ERRBUF_SIZE     1024
  80 static const char *
  81 win32_strerror(DWORD error)
  82 {
  83   static char errbuf[ERRBUF_SIZE+1];
  84   size_t errlen;
  85
  86   FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
  87                 ERRBUF_SIZE, NULL);
  88
  89   /*
  90    * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
  91    * message.  Get rid of it.
  92    */
  93   errlen = strlen(errbuf);
  94   if (errlen >= 2) {
  95     errbuf[errlen - 1] = '\0';
  96     errbuf[errlen - 2] = '\0';
  97     errlen -= 2;
  98   }
  99   return errbuf;
 100 }
 101 #else
 102 static void
 103 catch_sigusr1(int sig _U_)
 104 {
 105         printf("Got SIGUSR1\n");
 106 }
 107 #endif
 108
 109 static void
 110 sleep_secs(int secs)
 111 {
 112 #ifdef _WIN32
 113         Sleep(secs*1000);
 114 #else
 115         unsigned secs_remaining;
 116
 117         if (secs <= 0)
 118                 return;
 119         secs_remaining = secs;
 120         while (secs_remaining != 0)
 121                 secs_remaining = sleep(secs_remaining);
 122 #endif
 123 }
 124
 125 static THREAD_FUNC_RETURN_TYPE
 126 capture_thread_func(THREAD_FUNC_ARG_TYPE arg)
 127 {
 128         char *device = arg;
 129         int packet_count;
 130         int status;
 131 #ifndef _WIN32
 132         struct sigaction action;
 133         sigset_t mask;
 134 #endif
 135
 136 #ifndef _WIN32
 137         sigemptyset(&mask);
 138         action.sa_handler = catch_sigusr1;
 139         action.sa_mask = mask;
 140         action.sa_flags = 0;
 141         if (sigaction(SIGUSR1, &action, NULL) == -1)
 142                 error("Can't catch SIGUSR1: %s", strerror(errno));
 143 #endif
 144
 145         printf("Listening on %s\n", device);
 146         for (;;) {
 147                 packet_count = 0;
 148                 status = pcap_dispatch(pd, -1, countme,
 149                     (u_char *)&packet_count);
 150                 if (status < 0)
 151                         break;
 152                 if (status != 0) {
 153                         printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
 154                             status, packet_count);
 155                 }
 156         }
 157         if (status == -2) {
 158                 /*
 159                  * We got interrupted, so perhaps we didn't
 160                  * manage to finish a line we were printing.
 161                  * Print an extra newline, just in case.
 162                  */
 163                 putchar('\n');
 164                 printf("Loop got broken\n");
 165         }
 166         (void)fflush(stdout);
 167         if (status == -1) {
 168                 /*
 169                  * Error.  Report it.
 170                  */
 171                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 172                     program_name, pcap_geterr(pd));
 173         }
 174         return 0;
 175 }
 176
 177 int
 178 main(int argc, char **argv)
 179 {
 180         register int op;
 181         register char *cp, *cmdbuf, *device;
 182         int immediate = 0;
 183         pcap_if_t *devlist;
 184         bpf_u_int32 localnet, netmask;
 185         struct bpf_program fcode;
 186         char ebuf[PCAP_ERRBUF_SIZE];
 187         int status;
 188         THREAD_HANDLE capture_thread;
 189         void *retval;
 190
 191         device = NULL;
 192         if ((cp = strrchr(argv[0], '/')) != NULL)
 193                 program_name = cp + 1;
 194         else
 195                 program_name = argv[0];
 196
 197         opterr = 0;
 198         while ((op = getopt(argc, argv, "i:")) != -1) {
 199                 switch (op) {
 200
 201                 case 'i':
 202                         device = optarg;
 203                         break;
 204
 205                 default:
 206                         usage();
 207                         /* NOTREACHED */
 208                 }
 209         }
 210
 211         if (device == NULL) {
 212                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 213                         error("%s", ebuf);
 214                 if (devlist == NULL)
 215                         error("no interfaces available for capture");
 216                 device = strdup(devlist->name);
 217                 pcap_freealldevs(devlist);
 218         }
 219         *ebuf = '\0';
 220         pd = pcap_create(device, ebuf);
 221         if (pd == NULL)
 222                 error("%s", ebuf);
 223         status = pcap_set_snaplen(pd, 65535);
 224         if (status != 0)
 225                 error("%s: pcap_set_snaplen failed: %s",
 226                             device, pcap_statustostr(status));
 227         if (immediate) {
 228                 status = pcap_set_immediate_mode(pd, 1);
 229                 if (status != 0)
 230                         error("%s: pcap_set_immediate_mode failed: %s",
 231                             device, pcap_statustostr(status));
 232         }
 233         status = pcap_set_timeout(pd, 5*60*1000);
 234         if (status != 0)
 235                 error("%s: pcap_set_timeout failed: %s",
 236                     device, pcap_statustostr(status));
 237         status = pcap_activate(pd);
 238         if (status < 0) {
 239                 /*
 240                  * pcap_activate() failed.
 241                  */
 242                 error("%s: %s\n(%s)", device,
 243                     pcap_statustostr(status), pcap_geterr(pd));
 244         } else if (status > 0) {
 245                 /*
 246                  * pcap_activate() succeeded, but it's warning us
 247                  * of a problem it had.
 248                  */
 249                 warning("%s: %s\n(%s)", device,
 250                     pcap_statustostr(status), pcap_geterr(pd));
 251         }
 252         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 253                 localnet = 0;
 254                 netmask = 0;
 255                 warning("%s", ebuf);
 256         }
 257         cmdbuf = copy_argv(&argv[optind]);
 258
 259         if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
 260                 error("%s", pcap_geterr(pd));
 261
 262         if (pcap_setfilter(pd, &fcode) < 0)
 263                 error("%s", pcap_geterr(pd));
 264
 265 #ifdef _WIN32
 266         capture_thread = CreateThread(NULL, 0, capture_thread_func, device,
 267             0, NULL);
 268         if (capture_thread == NULL)
 269                 error("Can't create capture thread: %s",
 270                     win32_strerror(GetLastError()));
 271 #else
 272         status = pthread_create(&capture_thread, NULL, capture_thread_func,
 273             device);
 274         if (status != 0)
 275                 error("Can't create capture thread: %s", strerror(status));
 276 #endif
 277         sleep_secs(60);
 278         pcap_breakloop(pd);
 279 #ifdef _WIN32
 280         printf("Setting event\n");
 281         if (!SetEvent(pcap_getevent(pd)))
 282                 error("Can't set event for pcap_t: %s",
 283                     win32_strerror(GetLastError()));
 284         if (WaitForSingleObject(capture_thread, INFINITE) == WAIT_FAILED)
 285                 error("Wait for thread termination failed: %s",
 286                     win32_strerror(GetLastError()));
 287         CloseHandle(capture_thread);
 288 #else
 289         printf("Sending SIGUSR1\n");
 290         status = pthread_kill(capture_thread, SIGUSR1);
 291         if (status != 0)
 292                 warning("Can't interrupt capture thread: %s", strerror(status));
 293         status = pthread_join(capture_thread, &retval);
 294         if (status != 0)
 295                 error("Wait for thread termination failed: %s",
 296                     strerror(status));
 297 #endif
 298
 299         pcap_close(pd);
 300         pcap_freecode(&fcode);
 301         exit(status == -1 ? 1 : 0);
 302 }
 303
 304 static void
 305 countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 306 {
 307         int *counterp = (int *)user;
 308
 309         (*counterp)++;
 310 }
 311
 312 static void
 313 usage(void)
 314 {
 315         (void)fprintf(stderr, "Usage: %s [ -m ] [ -i interface ] [ -t timeout] [expression]\n",
 316             program_name);
 317         exit(1);
 318 }
 319
 320 /* VARARGS */
 321 static void
 322 error(const char *fmt, ...)
 323 {
 324         va_list ap;
 325
 326         (void)fprintf(stderr, "%s: ", program_name);
 327         va_start(ap, fmt);
 328         (void)vfprintf(stderr, fmt, ap);
 329         va_end(ap);
 330         if (*fmt) {
 331                 fmt += strlen(fmt);
 332                 if (fmt[-1] != '\n')
 333                         (void)fputc('\n', stderr);
 334         }
 335         exit(1);
 336         /* NOTREACHED */
 337 }
 338
 339 /* VARARGS */
 340 static void
 341 warning(const char *fmt, ...)
 342 {
 343         va_list ap;
 344
 345         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 346         va_start(ap, fmt);
 347         (void)vfprintf(stderr, fmt, ap);
 348         va_end(ap);
 349         if (*fmt) {
 350                 fmt += strlen(fmt);
 351                 if (fmt[-1] != '\n')
 352                         (void)fputc('\n', stderr);
 353         }
 354 }
 355
 356 /*
 357  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 358  */
 359 static char *
 360 copy_argv(register char **argv)
 361 {
 362         register char **p;
 363         register u_int len = 0;
 364         char *buf;
 365         char *src, *dst;
 366
 367         p = argv;
 368         if (*p == 0)
 369                 return 0;
 370
 371         while (*p)
 372                 len += strlen(*p++) + 1;
 373
 374         buf = (char *)malloc(len);
 375         if (buf == NULL)
 376                 error("copy_argv: malloc");
 377
 378         p = argv;
 379         dst = buf;
 380         while ((src = *p++) != NULL) {
 381                 while ((*dst++ = *src++) != '\0')
 382                         ;
 383                 dst[-1] = ' ';
 384         }
 385         dst[-1] = '\0';
 386
 387         return buf;
 388 }