The Tcpdump Group git mirrors - libpcap/blob - testprogs/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 #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 <pcap.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <stdarg.h>
  35 #ifdef _WIN32
  36   #include "getopt.h"
  37 #else
  38   #include <unistd.h>
  39 #endif
  40 #include <errno.h>
  41
  42 #include "pcap/funcattrs.h"
  43
  44 #ifdef _WIN32
  45   #include "portability.h"
  46 #endif
  47
  48 #define MAXIMUM_SNAPLEN         262144
  49
  50 static char *program_name;
  51
  52 /* Forwards */
  53 static void PCAP_NORETURN usage(void);
  54 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  55 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60         register int op;
  61         register char *cp, *device;
  62         int dorfmon, dopromisc, snaplen, useactivate, useopen, bufsize;
  63         char ebuf[PCAP_ERRBUF_SIZE];
  64         pcap_if_t *devlist;
  65         pcap_t *pd;
  66         int status = 0;
  67
  68         device = NULL;
  69         dorfmon = 0;
  70         dopromisc = 0;
  71         snaplen = MAXIMUM_SNAPLEN;
  72         bufsize = 0;
  73         useactivate = 0;
  74         useopen = 0;
  75         if ((cp = strrchr(argv[0], '/')) != NULL)
  76                 program_name = cp + 1;
  77         else
  78                 program_name = argv[0];
  79
  80         opterr = 0;
  81         while ((op = getopt(argc, argv, "i:Iops:aB:")) != -1) {
  82                 switch (op) {
  83
  84                 case 'i':
  85                         device = strdup(optarg);
  86                         break;
  87
  88                 case 'I':
  89                         dorfmon = 1;
  90                         useactivate = 1;        /* required for rfmon */
  91                         break;
  92
  93                 case 'o':
  94                         useopen = 1;
  95                         break;
  96
  97                 case 'p':
  98                         dopromisc = 1;
  99                         break;
 100
 101                 case 's': {
 102                         char *end;
 103                         long long_snaplen;
 104
 105                         long_snaplen = strtol(optarg, &end, 0);
 106                         if (optarg == end || *end != '\0'
 107                             || long_snaplen < 0
 108                             || long_snaplen > MAXIMUM_SNAPLEN)
 109                                 error("invalid snaplen %s", optarg);
 110                         else {
 111                                 if (snaplen == 0)
 112                                         snaplen = MAXIMUM_SNAPLEN;
 113                                 else
 114                                         snaplen = (int)long_snaplen;
 115                         }
 116                         break;
 117                 }
 118
 119                 case 'B':
 120                         bufsize = atoi(optarg)*1024;
 121                         if (bufsize <= 0)
 122                                 error("invalid packet buffer size %s", optarg);
 123                         useactivate = 1;        /* required for bufsize */
 124                         break;
 125
 126                 case 'a':
 127                         useactivate = 1;
 128                         break;
 129
 130                 default:
 131                         usage();
 132                         /* NOTREACHED */
 133                 }
 134         }
 135
 136         if (device == NULL) {
 137                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 138                         error("%s", ebuf);
 139                 if (devlist == NULL)
 140                         error("no interfaces available for capture");
 141                 device = strdup(devlist->name);
 142                 pcap_freealldevs(devlist);
 143         }
 144         if (useactivate) {
 145                 pd = pcap_create(device, ebuf);
 146                 if (pd == NULL)
 147                         error("%s: pcap_create failed: %s", device, ebuf);
 148                 status = pcap_set_snaplen(pd, snaplen);
 149                 if (status != 0)
 150                         error("%s: pcap_set_snaplen failed: %s",
 151                             device, pcap_statustostr(status));
 152                 if (dopromisc) {
 153                         status = pcap_set_promisc(pd, 1);
 154                         if (status != 0)
 155                                 error("%s: pcap_set_promisc failed: %s",
 156                                     device, pcap_statustostr(status));
 157                 }
 158                 if (dorfmon) {
 159                         status = pcap_set_rfmon(pd, 1);
 160                         if (status != 0)
 161                                 error("%s: pcap_set_rfmon failed: %s",
 162                                     device, pcap_statustostr(status));
 163                 }
 164                 status = pcap_set_timeout(pd, 1000);
 165                 if (status != 0)
 166                         error("%s: pcap_set_timeout failed: %s",
 167                             device, pcap_statustostr(status));
 168                 if (bufsize != 0) {
 169                         status = pcap_set_buffer_size(pd, bufsize);
 170                         if (status != 0)
 171                                 error("%s: pcap_set_buffer_size failed: %s",
 172                                     device, pcap_statustostr(status));
 173                 }
 174                 status = pcap_activate(pd);
 175                 if (status < 0) {
 176                         /*
 177                          * pcap_activate() failed.
 178                          */
 179                         error("%s: %s\n(%s)", device,
 180                             pcap_statustostr(status), pcap_geterr(pd));
 181                 } else if (status > 0) {
 182                         /*
 183                          * pcap_activate() succeeded, but it's warning us
 184                          * of a problem it had.
 185                          */
 186                         warning("%s: %s\n(%s)", device,
 187                             pcap_statustostr(status), pcap_geterr(pd));
 188                 } else
 189                         printf("%s opened successfully\n", device);
 190         } else if (useopen) {
 191                 *ebuf = '\0';
 192                 pd = pcap_open(device, 65535, PCAP_OPENFLAG_PROMISCUOUS,
 193                     1000, NULL, ebuf);
 194                 if (pd == NULL)
 195                         error("%s", ebuf);
 196                 else if (*ebuf)
 197                         warning("%s", ebuf);
 198                 else
 199                         printf("%s opened successfully\n", device);
 200         } else {
 201                 *ebuf = '\0';
 202                 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
 203                 if (pd == NULL)
 204                         error("%s", ebuf);
 205                 else if (*ebuf)
 206                         warning("%s", ebuf);
 207                 else
 208                         printf("%s opened successfully\n", device);
 209         }
 210         free(device);
 211         pcap_close(pd);
 212         exit(status < 0 ? 1 : 0);
 213 }
 214
 215 static void
 216 usage(void)
 217 {
 218         (void)fprintf(stderr,
 219             "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
 220             program_name);
 221         exit(1);
 222 }
 223
 224 /* VARARGS */
 225 static void
 226 error(const char *fmt, ...)
 227 {
 228         va_list ap;
 229
 230         (void)fprintf(stderr, "%s: ", program_name);
 231         va_start(ap, fmt);
 232         (void)vfprintf(stderr, fmt, ap);
 233         va_end(ap);
 234         if (*fmt) {
 235                 fmt += strlen(fmt);
 236                 if (fmt[-1] != '\n')
 237                         (void)fputc('\n', stderr);
 238         }
 239         exit(1);
 240         /* NOTREACHED */
 241 }
 242
 243 /* VARARGS */
 244 static void
 245 warning(const char *fmt, ...)
 246 {
 247         va_list ap;
 248
 249         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 250         va_start(ap, fmt);
 251         (void)vfprintf(stderr, fmt, ap);
 252         va_end(ap);
 253         if (*fmt) {
 254                 fmt += strlen(fmt);
 255                 if (fmt[-1] != '\n')
 256                         (void)fputc('\n', stderr);
 257         }
 258 }