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 #include <pthread.h>
  34 #include <signal.h>
  35 #include <unistd.h>
  36 #include <errno.h>
  37 #include <sys/types.h>
  38
  39 #include <pcap.h>
  40
  41 #include "pcap/funcattrs.h"
  42
  43 static char *program_name;
  44
  45 /* Forwards */
  46 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
  47 static void PCAP_NORETURN usage(void);
  48 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  49 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  50 static char *copy_argv(char **);
  51
  52 static pcap_t *pd;
  53
  54 static void
  55 catch_sigusr1(int sig _U_)
  56 {
  57         printf("Got SIGUSR1\n");
  58 }
  59
  60 static void *
  61 capture_thread_func(void *arg)
  62 {
  63         char *device = arg;
  64         int packet_count;
  65         struct sigaction action;
  66         int status;
  67         sigset_t mask;
  68
  69         sigemptyset(&mask);
  70         action.sa_handler = catch_sigusr1;
  71         action.sa_mask = mask;
  72         action.sa_flags = 0;
  73         if (sigaction(SIGUSR1, &action, NULL) == -1)
  74                 error("Can't catch SIGUSR1: %s", strerror(errno));
  75
  76         printf("Listening on %s\n", device);
  77         for (;;) {
  78                 packet_count = 0;
  79                 status = pcap_dispatch(pd, -1, countme,
  80                     (u_char *)&packet_count);
  81                 if (status < 0)
  82                         break;
  83                 if (status != 0) {
  84                         printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
  85                             status, packet_count);
  86                 }
  87         }
  88         if (status == -2) {
  89                 /*
  90                  * We got interrupted, so perhaps we didn't
  91                  * manage to finish a line we were printing.
  92                  * Print an extra newline, just in case.
  93                  */
  94                 putchar('\n');
  95                 printf("Loop got broken\n");
  96         }
  97         (void)fflush(stdout);
  98         if (status == -1) {
  99                 /*
 100                  * Error.  Report it.
 101                  */
 102                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 103                     program_name, pcap_geterr(pd));
 104         }
 105         return NULL;
 106 }
 107
 108 int
 109 main(int argc, char **argv)
 110 {
 111         register int op;
 112         register char *cp, *cmdbuf, *device;
 113         int immediate = 0;
 114         pcap_if_t *devlist;
 115         bpf_u_int32 localnet, netmask;
 116         struct bpf_program fcode;
 117         char ebuf[PCAP_ERRBUF_SIZE];
 118         int status;
 119         pthread_t capture_thread;
 120         void *retval;
 121
 122         device = NULL;
 123         if ((cp = strrchr(argv[0], '/')) != NULL)
 124                 program_name = cp + 1;
 125         else
 126                 program_name = argv[0];
 127
 128         opterr = 0;
 129         while ((op = getopt(argc, argv, "i:")) != -1) {
 130                 switch (op) {
 131
 132                 case 'i':
 133                         device = optarg;
 134                         break;
 135
 136                 default:
 137                         usage();
 138                         /* NOTREACHED */
 139                 }
 140         }
 141
 142         if (device == NULL) {
 143                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 144                         error("%s", ebuf);
 145                 if (devlist == NULL)
 146                         error("no interfaces available for capture");
 147                 device = strdup(devlist->name);
 148                 pcap_freealldevs(devlist);
 149         }
 150         *ebuf = '\0';
 151         pd = pcap_create(device, ebuf);
 152         if (pd == NULL)
 153                 error("%s", ebuf);
 154         status = pcap_set_snaplen(pd, 65535);
 155         if (status != 0)
 156                 error("%s: pcap_set_snaplen failed: %s",
 157                             device, pcap_statustostr(status));
 158         if (immediate) {
 159                 status = pcap_set_immediate_mode(pd, 1);
 160                 if (status != 0)
 161                         error("%s: pcap_set_immediate_mode failed: %s",
 162                             device, pcap_statustostr(status));
 163         }
 164         status = pcap_set_timeout(pd, 5*60*1000);
 165         if (status != 0)
 166                 error("%s: pcap_set_timeout failed: %s",
 167                     device, pcap_statustostr(status));
 168         status = pcap_activate(pd);
 169         if (status < 0) {
 170                 /*
 171                  * pcap_activate() failed.
 172                  */
 173                 error("%s: %s\n(%s)", device,
 174                     pcap_statustostr(status), pcap_geterr(pd));
 175         } else if (status > 0) {
 176                 /*
 177                  * pcap_activate() succeeded, but it's warning us
 178                  * of a problem it had.
 179                  */
 180                 warning("%s: %s\n(%s)", device,
 181                     pcap_statustostr(status), pcap_geterr(pd));
 182         }
 183         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 184                 localnet = 0;
 185                 netmask = 0;
 186                 warning("%s", ebuf);
 187         }
 188         cmdbuf = copy_argv(&argv[optind]);
 189
 190         if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
 191                 error("%s", pcap_geterr(pd));
 192
 193         if (pcap_setfilter(pd, &fcode) < 0)
 194                 error("%s", pcap_geterr(pd));
 195         status = pthread_create(&capture_thread, NULL, capture_thread_func,
 196             device);
 197         if (status != 0)
 198                 error("Can't create capture thread: %s", strerror(status));
 199         sleep(60);
 200         pcap_breakloop(pd);
 201         printf("Sending SIGUSR1\n");
 202         status = pthread_kill(capture_thread, SIGUSR1);
 203         if (status != 0)
 204                 warning("Can't interrupt capture thread: %s", strerror(status));
 205         status = pthread_join(capture_thread, &retval);
 206         pcap_close(pd);
 207         pcap_freecode(&fcode);
 208         exit(status == -1 ? 1 : 0);
 209 }
 210
 211 static void
 212 countme(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 213 {
 214         int *counterp = (int *)user;
 215
 216         (*counterp)++;
 217 }
 218
 219 static void
 220 usage(void)
 221 {
 222         (void)fprintf(stderr, "Usage: %s [ -m ] [ -i interface ] [ -t timeout] [expression]\n",
 223             program_name);
 224         exit(1);
 225 }
 226
 227 /* VARARGS */
 228 static void
 229 error(const char *fmt, ...)
 230 {
 231         va_list ap;
 232
 233         (void)fprintf(stderr, "%s: ", program_name);
 234         va_start(ap, fmt);
 235         (void)vfprintf(stderr, fmt, ap);
 236         va_end(ap);
 237         if (*fmt) {
 238                 fmt += strlen(fmt);
 239                 if (fmt[-1] != '\n')
 240                         (void)fputc('\n', stderr);
 241         }
 242         exit(1);
 243         /* NOTREACHED */
 244 }
 245
 246 /* VARARGS */
 247 static void
 248 warning(const char *fmt, ...)
 249 {
 250         va_list ap;
 251
 252         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 253         va_start(ap, fmt);
 254         (void)vfprintf(stderr, fmt, ap);
 255         va_end(ap);
 256         if (*fmt) {
 257                 fmt += strlen(fmt);
 258                 if (fmt[-1] != '\n')
 259                         (void)fputc('\n', stderr);
 260         }
 261 }
 262
 263 /*
 264  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 265  */
 266 static char *
 267 copy_argv(register char **argv)
 268 {
 269         register char **p;
 270         register u_int len = 0;
 271         char *buf;
 272         char *src, *dst;
 273
 274         p = argv;
 275         if (*p == 0)
 276                 return 0;
 277
 278         while (*p)
 279                 len += strlen(*p++) + 1;
 280
 281         buf = (char *)malloc(len);
 282         if (buf == NULL)
 283                 error("copy_argv: malloc");
 284
 285         p = argv;
 286         dst = buf;
 287         while ((src = *p++) != NULL) {
 288                 while ((*dst++ = *src++) != '\0')
 289                         ;
 290                 dst[-1] = ' ';
 291         }
 292         dst[-1] = '\0';
 293
 294         return buf;
 295 }