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, 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         if ((cp = strrchr(argv[0], '/')) != NULL)
  75                 program_name = cp + 1;
  76         else
  77                 program_name = argv[0];
  78
  79         opterr = 0;
  80         while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
  81                 switch (op) {
  82
  83                 case 'i':
  84                         device = optarg;
  85                         break;
  86
  87                 case 'I':
  88                         dorfmon = 1;
  89                         useactivate = 1;        /* required for rfmon */
  90                         break;
  91
  92                 case 'p':
  93                         dopromisc = 1;
  94                         break;
  95
  96                 case 's': {
  97                         char *end;
  98                         long long_snaplen;
  99
 100                         long_snaplen = strtol(optarg, &end, 0);
 101                         if (optarg == end || *end != '\0'
 102                             || long_snaplen < 0
 103                             || long_snaplen > MAXIMUM_SNAPLEN)
 104                                 error("invalid snaplen %s", optarg);
 105                         else {
 106                                 if (snaplen == 0)
 107                                         snaplen = MAXIMUM_SNAPLEN;
 108                                 else
 109                                         snaplen = (int)long_snaplen;
 110                         }
 111                         break;
 112                 }
 113
 114                 case 'B':
 115                         bufsize = atoi(optarg)*1024;
 116                         if (bufsize <= 0)
 117                                 error("invalid packet buffer size %s", optarg);
 118                         useactivate = 1;        /* required for bufsize */
 119                         break;
 120
 121                 case 'a':
 122                         useactivate = 1;
 123                         break;
 124
 125                 default:
 126                         usage();
 127                         /* NOTREACHED */
 128                 }
 129         }
 130
 131         if (device == NULL) {
 132                 if (pcap_findalldevs(&devlist, ebuf) == -1)
 133                         error("%s", ebuf);
 134                 if (devlist == NULL)
 135                         error("no interfaces available for capture");
 136                 device = strdup(devlist->name);
 137                 pcap_freealldevs(devlist);
 138         }
 139         if (useactivate) {
 140                 pd = pcap_create(device, ebuf);
 141                 if (pd == NULL)
 142                         error("%s: pcap_create failed: %s", device, ebuf);
 143                 status = pcap_set_snaplen(pd, snaplen);
 144                 if (status != 0)
 145                         error("%s: pcap_set_snaplen failed: %s",
 146                             device, pcap_statustostr(status));
 147                 if (dopromisc) {
 148                         status = pcap_set_promisc(pd, 1);
 149                         if (status != 0)
 150                                 error("%s: pcap_set_promisc failed: %s",
 151                                     device, pcap_statustostr(status));
 152                 }
 153                 if (dorfmon) {
 154                         status = pcap_set_rfmon(pd, 1);
 155                         if (status != 0)
 156                                 error("%s: pcap_set_rfmon failed: %s",
 157                                     device, pcap_statustostr(status));
 158                 }
 159                 status = pcap_set_timeout(pd, 1000);
 160                 if (status != 0)
 161                         error("%s: pcap_set_timeout failed: %s",
 162                             device, pcap_statustostr(status));
 163                 if (bufsize != 0) {
 164                         status = pcap_set_buffer_size(pd, bufsize);
 165                         if (status != 0)
 166                                 error("%s: pcap_set_buffer_size failed: %s",
 167                                     device, pcap_statustostr(status));
 168                 }
 169                 status = pcap_activate(pd);
 170                 if (status < 0) {
 171                         /*
 172                          * pcap_activate() failed.
 173                          */
 174                         error("%s: %s\n(%s)", device,
 175                             pcap_statustostr(status), pcap_geterr(pd));
 176                 } else if (status > 0) {
 177                         /*
 178                          * pcap_activate() succeeded, but it's warning us
 179                          * of a problem it had.
 180                          */
 181                         warning("%s: %s\n(%s)", device,
 182                             pcap_statustostr(status), pcap_geterr(pd));
 183                 } else
 184                         printf("%s opened successfully\n", device);
 185         } else {
 186                 *ebuf = '\0';
 187                 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
 188                 if (pd == NULL)
 189                         error("%s", ebuf);
 190                 else if (*ebuf)
 191                         warning("%s", ebuf);
 192                 else
 193                         printf("%s opened successfully\n", device);
 194         }
 195         pcap_close(pd);
 196         exit(status < 0 ? 1 : 0);
 197 }
 198
 199 static void
 200 usage(void)
 201 {
 202         (void)fprintf(stderr,
 203             "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
 204             program_name);
 205         exit(1);
 206 }
 207
 208 /* VARARGS */
 209 static void
 210 error(const char *fmt, ...)
 211 {
 212         va_list ap;
 213
 214         (void)fprintf(stderr, "%s: ", program_name);
 215         va_start(ap, fmt);
 216         (void)vfprintf(stderr, fmt, ap);
 217         va_end(ap);
 218         if (*fmt) {
 219                 fmt += strlen(fmt);
 220                 if (fmt[-1] != '\n')
 221                         (void)fputc('\n', stderr);
 222         }
 223         exit(1);
 224         /* NOTREACHED */
 225 }
 226
 227 /* VARARGS */
 228 static void
 229 warning(const char *fmt, ...)
 230 {
 231         va_list ap;
 232
 233         (void)fprintf(stderr, "%s: WARNING: ", 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 }