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 23static const char copyright[] = 24 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\ 25The 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 38static char *program_name; 39 40/* Forwards */ 41static void usage(void) __attribute__((noreturn)); 42static void error(const char *, ...); 43static void warning(const char *, ...); 44 45extern int optind; 46extern int opterr; 47extern char *optarg; 48 49int 50main(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 int getiftapcount = 0; 59 60 device = NULL; 61 dorfmon = 0; 62 dopromisc = 0; 63 snaplen = MAXIMUM_SNAPLEN; 64 bufsize = 0; 65 useactivate = 0; 66 if ((cp = strrchr(argv[0], '/')) != NULL) 67 program_name = cp + 1; 68 else 69 program_name = argv[0]; 70 71 opterr = 0; 72 while ((op = getopt(argc, argv, "gi:Ips:aB:")) != -1) { 73 switch (op) { 74 75 case 'i': 76 device = optarg; 77 break; 78 79 case 'g': 80 getiftapcount = 1; 81 break; 82 83 case 'I': 84 dorfmon = 1; 85 useactivate = 1; /* required for rfmon */ 86 break; 87 88 case 'p': 89 dopromisc = 1; 90 break; 91 92 case 's': { 93 char *end; 94 95 snaplen = strtol(optarg, &end, 0); 96 if (optarg == end || *end != '\0' 97 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN) 98 error("invalid snaplen %s", optarg); 99 else if (snaplen == 0) 100 snaplen = MAXIMUM_SNAPLEN; 101 break; 102 } 103 104 case 'B': 105 bufsize = atoi(optarg)*1024; 106 if (bufsize <= 0) 107 error("invalid packet buffer size %s", optarg); 108 useactivate = 1; /* required for bufsize */ 109 break; 110 111 case 'a': 112 useactivate = 1; 113 break; 114 115 default: 116 usage(); 117 /* NOTREACHED */ 118 } 119 } 120 121 if (useactivate) { 122 pd = pcap_create(device, ebuf); 123 if (pd == NULL) 124 error("%s", ebuf); 125 status = pcap_set_snaplen(pd, snaplen); 126 if (status != 0) 127 error("%s: pcap_set_snaplen failed: %s", 128 device, pcap_statustostr(status)); 129 if (dopromisc) { 130 status = pcap_set_promisc(pd, 1); 131 if (status != 0) 132 error("%s: pcap_set_promisc failed: %s", 133 device, pcap_statustostr(status)); 134 } 135 if (dorfmon) { 136 status = pcap_set_rfmon(pd, 1); 137 if (status != 0) 138 error("%s: pcap_set_rfmon failed: %s", 139 device, pcap_statustostr(status)); 140 } 141 status = pcap_set_timeout(pd, 1000); 142 if (status != 0) 143 error("%s: pcap_set_timeout failed: %s", 144 device, pcap_statustostr(status)); 145 if (bufsize != 0) { 146 status = pcap_set_buffer_size(pd, bufsize); 147 if (status != 0) 148 error("%s: pcap_set_buffer_size failed: %s", 149 device, pcap_statustostr(status)); 150 } 151 status = pcap_activate(pd); 152 if (status < 0) { 153 /* 154 * pcap_activate() failed. 155 */ 156 error("%s: %s\n(%s)", device, 157 pcap_statustostr(status), pcap_geterr(pd)); 158 } else if (status > 0) { 159 /* 160 * pcap_activate() succeeded, but it's warning us 161 * of a problem it had. 162 */ 163 warning("%s: %s\n(%s)", device, 164 pcap_statustostr(status), pcap_geterr(pd)); 165 } 166 } else { 167 *ebuf = '\0'; 168 pd = pcap_open_live(device, 65535, 0, 1000, ebuf); 169 if (pd == NULL) 170 error("%s", ebuf); 171 else if (*ebuf) 172 warning("%s", ebuf); 173 } 174 pcap_close(pd); 175 exit(status < 0 ? 1 : 0); 176} 177 178static void 179usage(void) 180{ 181 (void)fprintf(stderr, 182 "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n", 183 program_name); 184 exit(1); 185} 186 187/* VARARGS */ 188static void 189error(const char *fmt, ...) 190{ 191 va_list ap; 192 193 (void)fprintf(stderr, "%s: ", program_name); 194 va_start(ap, fmt); 195 (void)vfprintf(stderr, fmt, ap); 196 va_end(ap); 197 if (*fmt) { 198 fmt += strlen(fmt); 199 if (fmt[-1] != '\n') 200 (void)fputc('\n', stderr); 201 } 202 exit(1); 203 /* NOTREACHED */ 204} 205 206/* VARARGS */ 207static void 208warning(const char *fmt, ...) 209{ 210 va_list ap; 211 212 (void)fprintf(stderr, "%s: WARNING: ", program_name); 213 va_start(ap, fmt); 214 (void)vfprintf(stderr, fmt, ap); 215 va_end(ap); 216 if (*fmt) { 217 fmt += strlen(fmt); 218 if (fmt[-1] != '\n') 219 (void)fputc('\n', stderr); 220 } 221} 222