The Tcpdump Group git mirrors - libpcap/blob - 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[] =
  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 #include <unistd.h>
  34 #include <errno.h>
  35
  36 #define MAXIMUM_SNAPLEN         65535
  37
  38 static char *program_name;
  39
  40 /* Forwards */
  41 static void usage(void) __attribute__((noreturn));
  42 static void error(const char *, ...);
  43 static void warning(const char *, ...);
  44
  45 extern int optind;
  46 extern int opterr;
  47 extern char *optarg;
  48
  49 int
  50 main(int argc, char **argv)
  51 {
  52         register int op;
  53         register char *cp, *device;
  54         int dorfmon, dopromisc, snaplen, useactivate, bufsize;
  55         char ebuf[PCAP_ERRBUF_SIZE];
  56         pcap_t *pd;
  57         int status = 0;
  58
  59         device = NULL;
  60         dorfmon = 0;
  61         dopromisc = 0;
  62         snaplen = MAXIMUM_SNAPLEN;
  63         bufsize = 0;
  64         useactivate = 0;
  65         if ((cp = strrchr(argv[0], '/')) != NULL)
  66                 program_name = cp + 1;
  67         else
  68                 program_name = argv[0];
  69
  70         opterr = 0;
  71         while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
  72                 switch (op) {
  73
  74                 case 'i':
  75                         device = optarg;
  76                         break;
  77
  78                 case 'I':
  79                         dorfmon = 1;
  80                         useactivate = 1;        /* required for rfmon */
  81                         break;
  82
  83                 case 'p':
  84                         dopromisc = 1;
  85                         break;
  86
  87                 case 's': {
  88                         char *end;
  89
  90                         snaplen = strtol(optarg, &end, 0);
  91                         if (optarg == end || *end != '\0'
  92                             || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
  93                                 error("invalid snaplen %s", optarg);
  94                         else if (snaplen == 0)
  95                                 snaplen = MAXIMUM_SNAPLEN;
  96                         break;
  97                 }
  98
  99                 case 'B':
 100                         bufsize = atoi(optarg)*1024;
 101                         if (bufsize <= 0)
 102                                 error("invalid packet buffer size %s", optarg);
 103                         useactivate = 1;        /* required for bufsize */
 104                         break;
 105
 106                 case 'a':
 107                         useactivate = 1;
 108                         break;
 109
 110                 default:
 111                         usage();
 112                         /* NOTREACHED */
 113                 }
 114         }
 115
 116         if (useactivate) {
 117                 pd = pcap_create(device, ebuf);
 118                 if (pd == NULL)
 119                         error("%s", ebuf);
 120                 status = pcap_set_snaplen(pd, snaplen);
 121                 if (status != 0)
 122                         error("%s: pcap_set_snaplen failed: %s",
 123                             device, pcap_statustostr(status));
 124                 if (dopromisc) {
 125                         status = pcap_set_promisc(pd, 1);
 126                         if (status != 0)
 127                                 error("%s: pcap_set_promisc failed: %s",
 128                                     device, pcap_statustostr(status));
 129                 }
 130                 if (dorfmon) {
 131                         status = pcap_set_rfmon(pd, 1);
 132                         if (status != 0)
 133                                 error("%s: pcap_set_rfmon failed: %s",
 134                                     device, pcap_statustostr(status));
 135                 }
 136                 status = pcap_set_timeout(pd, 1000);
 137                 if (status != 0)
 138                         error("%s: pcap_set_timeout failed: %s",
 139                             device, pcap_statustostr(status));
 140                 if (bufsize != 0) {
 141                         status = pcap_set_buffer_size(pd, bufsize);
 142                         if (status != 0)
 143                                 error("%s: pcap_set_buffer_size failed: %s",
 144                                     device, pcap_statustostr(status));
 145                 }
 146                 status = pcap_activate(pd);
 147                 if (status < 0) {
 148                         /*
 149                          * pcap_activate() failed.
 150                          */
 151                         error("%s: %s\n(%s)", device,
 152                             pcap_statustostr(status), pcap_geterr(pd));
 153                 } else if (status > 0) {
 154                         /*
 155                          * pcap_activate() succeeded, but it's warning us
 156                          * of a problem it had.
 157                          */
 158                         warning("%s: %s\n(%s)", device,
 159                             pcap_statustostr(status), pcap_geterr(pd));
 160                 }
 161         } else {
 162                 *ebuf = '\0';
 163                 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
 164                 if (pd == NULL)
 165                         error("%s", ebuf);
 166                 else if (*ebuf)
 167                         warning("%s", ebuf);
 168         }
 169         pcap_close(pd);
 170         exit(status < 0 ? 1 : 0);
 171 }
 172
 173 static void
 174 usage(void)
 175 {
 176         (void)fprintf(stderr,
 177             "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
 178             program_name);
 179         exit(1);
 180 }
 181
 182 /* VARARGS */
 183 static void
 184 error(const char *fmt, ...)
 185 {
 186         va_list ap;
 187
 188         (void)fprintf(stderr, "%s: ", program_name);
 189         va_start(ap, fmt);
 190         (void)vfprintf(stderr, fmt, ap);
 191         va_end(ap);
 192         if (*fmt) {
 193                 fmt += strlen(fmt);
 194                 if (fmt[-1] != '\n')
 195                         (void)fputc('\n', stderr);
 196         }
 197         exit(1);
 198         /* NOTREACHED */
 199 }
 200
 201 /* VARARGS */
 202 static void
 203 warning(const char *fmt, ...)
 204 {
 205         va_list ap;
 206
 207         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 208         va_start(ap, fmt);
 209         (void)vfprintf(stderr, fmt, ap);
 210         va_end(ap);
 211         if (*fmt) {
 212                 fmt += strlen(fmt);
 213                 if (fmt[-1] != '\n')
 214                         (void)fputc('\n', stderr);
 215         }
 216 }