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 } 217
