The Tcpdump Group git mirrors - libpcap/blob - tests/opentest.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 <pcap.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <stdarg.h>
  33 #ifdef _WIN32
  34 #include "getopt.h"
  35 #else
  36 #include <unistd.h>
  37 #endif
  38 #include <errno.h>
  39
  40 #define MAXIMUM_SNAPLEN         65535
  41
  42 static char *program_name;
  43
  44 /*
  45  * This was introduced by Clang:
  46  *
  47  *     http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
  48  *
  49  * in some version (which version?); it has been picked up by GCC 5.0.
  50  */
  51 #ifndef __has_attribute
  52   /*
  53    * It's a macro, so you can check whether it's defined to check
  54    * whether it's supported.
  55    *
  56    * If it's not, define it to always return 0, so that we move on to
  57    * the fallback checks.
  58    */
  59   #define __has_attribute(x) 0
  60 #endif
  61
  62 #if __has_attribute(noreturn) \
  63     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
  64     || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
  65     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
  66     || (defined(__HP_aCC) && __HP_aCC >= 61000)
  67   /*
  68    * Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
  69    * (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
  70    * versions of XL C support this?), or HP aCC A.06.10 and later.
  71    */
  72   #define PCAP_NORETURN __attribute((noreturn))
  73 #elif defined( _MSC_VER )
  74   #define PCAP_NORETURN __declspec(noreturn)
  75 #else
  76   #define PCAP_NORETURN
  77 #endif
  78
  79 #if __has_attribute(__format__) \
  80     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
  81     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
  82     || (defined(__HP_aCC) && __HP_aCC >= 61000)
  83   /*
  84    * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
  85    * and later (do any earlier versions of XL C support this?),
  86    * or HP aCC A.06.10 and later.
  87    */
  88   #define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
  89 #else
  90   #define PCAP_PRINTFLIKE(x,y)
  91 #endif
  92
  93 /* Forwards */
  94 static void PCAP_NORETURN usage(void);
  95 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  96 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  97
  98 int
  99 main(int argc, char **argv)
 100 {
 101         register int op;
 102         register char *cp, *device;
 103         int dorfmon, dopromisc, snaplen, useactivate, bufsize;
 104         char ebuf[PCAP_ERRBUF_SIZE];
 105         pcap_t *pd;
 106         int status = 0;
 107
 108         device = NULL;
 109         dorfmon = 0;
 110         dopromisc = 0;
 111         snaplen = MAXIMUM_SNAPLEN;
 112         bufsize = 0;
 113         useactivate = 0;
 114         if ((cp = strrchr(argv[0], '/')) != NULL)
 115                 program_name = cp + 1;
 116         else
 117                 program_name = argv[0];
 118
 119         opterr = 0;
 120         while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
 121                 switch (op) {
 122
 123                 case 'i':
 124                         device = optarg;
 125                         break;
 126
 127                 case 'I':
 128                         dorfmon = 1;
 129                         useactivate = 1;        /* required for rfmon */
 130                         break;
 131
 132                 case 'p':
 133                         dopromisc = 1;
 134                         break;
 135
 136                 case 's': {
 137                         char *end;
 138
 139                         snaplen = strtol(optarg, &end, 0);
 140                         if (optarg == end || *end != '\0'
 141                             || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
 142                                 error("invalid snaplen %s", optarg);
 143                         else if (snaplen == 0)
 144                                 snaplen = MAXIMUM_SNAPLEN;
 145                         break;
 146                 }
 147
 148                 case 'B':
 149                         bufsize = atoi(optarg)*1024;
 150                         if (bufsize <= 0)
 151                                 error("invalid packet buffer size %s", optarg);
 152                         useactivate = 1;        /* required for bufsize */
 153                         break;
 154
 155                 case 'a':
 156                         useactivate = 1;
 157                         break;
 158
 159                 default:
 160                         usage();
 161                         /* NOTREACHED */
 162                 }
 163         }
 164
 165         if (useactivate) {
 166                 pd = pcap_create(device, ebuf);
 167                 if (pd == NULL)
 168                         error("%s", ebuf);
 169                 status = pcap_set_snaplen(pd, snaplen);
 170                 if (status != 0)
 171                         error("%s: pcap_set_snaplen failed: %s",
 172                             device, pcap_statustostr(status));
 173                 if (dopromisc) {
 174                         status = pcap_set_promisc(pd, 1);
 175                         if (status != 0)
 176                                 error("%s: pcap_set_promisc failed: %s",
 177                                     device, pcap_statustostr(status));
 178                 }
 179                 if (dorfmon) {
 180                         status = pcap_set_rfmon(pd, 1);
 181                         if (status != 0)
 182                                 error("%s: pcap_set_rfmon failed: %s",
 183                                     device, pcap_statustostr(status));
 184                 }
 185                 status = pcap_set_timeout(pd, 1000);
 186                 if (status != 0)
 187                         error("%s: pcap_set_timeout failed: %s",
 188                             device, pcap_statustostr(status));
 189                 if (bufsize != 0) {
 190                         status = pcap_set_buffer_size(pd, bufsize);
 191                         if (status != 0)
 192                                 error("%s: pcap_set_buffer_size failed: %s",
 193                                     device, pcap_statustostr(status));
 194                 }
 195                 status = pcap_activate(pd);
 196                 if (status < 0) {
 197                         /*
 198                          * pcap_activate() failed.
 199                          */
 200                         error("%s: %s\n(%s)", device,
 201                             pcap_statustostr(status), pcap_geterr(pd));
 202                 } else if (status > 0) {
 203                         /*
 204                          * pcap_activate() succeeded, but it's warning us
 205                          * of a problem it had.
 206                          */
 207                         warning("%s: %s\n(%s)", device,
 208                             pcap_statustostr(status), pcap_geterr(pd));
 209                 }
 210         } else {
 211                 *ebuf = '\0';
 212                 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
 213                 if (pd == NULL)
 214                         error("%s", ebuf);
 215                 else if (*ebuf)
 216                         warning("%s", ebuf);
 217         }
 218         pcap_close(pd);
 219         exit(status < 0 ? 1 : 0);
 220 }
 221
 222 static void
 223 usage(void)
 224 {
 225         (void)fprintf(stderr,
 226             "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
 227             program_name);
 228         exit(1);
 229 }
 230
 231 /* VARARGS */
 232 static void
 233 error(const char *fmt, ...)
 234 {
 235         va_list ap;
 236
 237         (void)fprintf(stderr, "%s: ", program_name);
 238         va_start(ap, fmt);
 239         (void)vfprintf(stderr, fmt, ap);
 240         va_end(ap);
 241         if (*fmt) {
 242                 fmt += strlen(fmt);
 243                 if (fmt[-1] != '\n')
 244                         (void)fputc('\n', stderr);
 245         }
 246         exit(1);
 247         /* NOTREACHED */
 248 }
 249
 250 /* VARARGS */
 251 static void
 252 warning(const char *fmt, ...)
 253 {
 254         va_list ap;
 255
 256         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 257         va_start(ap, fmt);
 258         (void)vfprintf(stderr, fmt, ap);
 259         va_end(ap);
 260         if (*fmt) {
 261                 fmt += strlen(fmt);
 262                 if (fmt[-1] != '\n')
 263                         (void)fputc('\n', stderr);
 264         }
 265 }