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 65535 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 99 snaplen = strtol(optarg, &end, 0); 100 if (optarg == end || *end != '\0' 101 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN) 102 error("invalid snaplen %s", optarg); 103 else if (snaplen == 0) 104 snaplen = MAXIMUM_SNAPLEN; 105 break; 106 } 107 108 case 'B': 109 bufsize = atoi(optarg)*1024; 110 if (bufsize <= 0) 111 error("invalid packet buffer size %s", optarg); 112 useactivate = 1; /* required for bufsize */ 113 break; 114 115 case 'a': 116 useactivate = 1; 117 break; 118 119 default: 120 usage(); 121 /* NOTREACHED */ 122 } 123 } 124 125 if (device == NULL) { 126 if (pcap_findalldevs(&devlist, ebuf) == -1) 127 error("%s", ebuf); 128 if (devlist == NULL) 129 error("no interfaces available for capture"); 130 device = strdup(devlist->name); 131 pcap_freealldevs(devlist); 132 } 133 if (useactivate) { 134 pd = pcap_create(device, ebuf); 135 if (pd == NULL) 136 error("%s: pcap_create failed: %s", device, ebuf); 137 status = pcap_set_snaplen(pd, snaplen); 138 if (status != 0) 139 error("%s: pcap_set_snaplen failed: %s", 140 device, pcap_statustostr(status)); 141 if (dopromisc) { 142 status = pcap_set_promisc(pd, 1); 143 if (status != 0) 144 error("%s: pcap_set_promisc failed: %s", 145 device, pcap_statustostr(status)); 146 } 147 if (dorfmon) { 148 status = pcap_set_rfmon(pd, 1); 149 if (status != 0) 150 error("%s: pcap_set_rfmon failed: %s", 151 device, pcap_statustostr(status)); 152 } 153 status = pcap_set_timeout(pd, 1000); 154 if (status != 0) 155 error("%s: pcap_set_timeout failed: %s", 156 device, pcap_statustostr(status)); 157 if (bufsize != 0) { 158 status = pcap_set_buffer_size(pd, bufsize); 159 if (status != 0) 160 error("%s: pcap_set_buffer_size failed: %s", 161 device, pcap_statustostr(status)); 162 } 163 status = pcap_activate(pd); 164 if (status < 0) { 165 /* 166 * pcap_activate() failed. 167 */ 168 error("%s: %s\n(%s)", device, 169 pcap_statustostr(status), pcap_geterr(pd)); 170 } else if (status > 0) { 171 /* 172 * pcap_activate() succeeded, but it's warning us 173 * of a problem it had. 174 */ 175 warning("%s: %s\n(%s)", device, 176 pcap_statustostr(status), pcap_geterr(pd)); 177 } else 178 printf("%s opened successfully\n", device); 179 } else { 180 *ebuf = '\0'; 181 pd = pcap_open_live(device, 65535, 0, 1000, ebuf); 182 if (pd == NULL) 183 error("%s", ebuf); 184 else if (*ebuf) 185 warning("%s", ebuf); 186 else 187 printf("%s opened successfully\n", device); 188 } 189 pcap_close(pd); 190 exit(status < 0 ? 1 : 0); 191 } 192 193 static void 194 usage(void) 195 { 196 (void)fprintf(stderr, 197 "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n", 198 program_name); 199 exit(1); 200 } 201 202 /* VARARGS */ 203 static void 204 error(const char *fmt, ...) 205 { 206 va_list ap; 207 208 (void)fprintf(stderr, "%s: ", program_name); 209 va_start(ap, fmt); 210 (void)vfprintf(stderr, fmt, ap); 211 va_end(ap); 212 if (*fmt) { 213 fmt += strlen(fmt); 214 if (fmt[-1] != '\n') 215 (void)fputc('\n', stderr); 216 } 217 exit(1); 218 /* NOTREACHED */ 219 } 220 221 /* VARARGS */ 222 static void 223 warning(const char *fmt, ...) 224 { 225 va_list ap; 226 227 (void)fprintf(stderr, "%s: WARNING: ", program_name); 228 va_start(ap, fmt); 229 (void)vfprintf(stderr, fmt, ap); 230 va_end(ap); 231 if (*fmt) { 232 fmt += strlen(fmt); 233 if (fmt[-1] != '\n') 234 (void)fputc('\n', stderr); 235 } 236 } 237