Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy) |
| 3 | * Copyright (c) 2005 - 2008 CACE Technologies, Davis (California) |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the Politecnico di Torino, CACE Technologies |
| 16 | * nor the names of its contributors may be used to endorse or promote |
| 17 | * products derived from this software without specific prior written |
| 18 | * permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #ifdef HAVE_CONFIG_H |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 35 | #include <config.h> |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 36 | #endif |
| 37 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 38 | /* |
| 39 | * sockutils.h may include <crtdbg.h> on Windows, and pcap-int.h will |
| 40 | * include portability.h, and portability.h, on Windows, expects that |
| 41 | * <crtdbg.h> has already been included, so include sockutils.h first. |
| 42 | */ |
| 43 | #include "sockutils.h" |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 44 | #include "pcap-int.h" // for the details of the pcap_t structure |
| 45 | #include "pcap-rpcap.h" |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 46 | #include "rpcap-protocol.h" |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 47 | #include <errno.h> // for the errno variable |
| 48 | #include <stdlib.h> // for malloc(), free(), ... |
| 49 | #include <string.h> // for strstr, etc |
| 50 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 51 | #ifndef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 52 | #include <dirent.h> // for readdir |
| 53 | #endif |
| 54 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 55 | /* String identifier to be used in the pcap_findalldevs_ex() */ |
| 56 | #define PCAP_TEXT_SOURCE_FILE "File" |
| 57 | /* String identifier to be used in the pcap_findalldevs_ex() */ |
| 58 | #define PCAP_TEXT_SOURCE_ADAPTER "Network adapter" |
| 59 | |
| 60 | /* String identifier to be used in the pcap_findalldevs_ex() */ |
| 61 | #define PCAP_TEXT_SOURCE_ON_LOCAL_HOST "on local host" |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 62 | |
| 63 | /**************************************************** |
| 64 | * * |
| 65 | * Function bodies * |
| 66 | * * |
| 67 | ****************************************************/ |
| 68 | |
| 69 | int pcap_findalldevs_ex(char *source, struct pcap_rmtauth *auth, pcap_if_t **alldevs, char *errbuf) |
| 70 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 71 | int type; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 72 | char name[PCAP_BUF_SIZE], path[PCAP_BUF_SIZE], filename[PCAP_BUF_SIZE]; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 73 | pcap_t *fp; |
| 74 | char tmpstring[PCAP_BUF_SIZE + 1]; /* Needed to convert names and descriptions from 'old' syntax to the 'new' one */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 75 | pcap_if_t *lastdev; /* Last device in the pcap_if_t list */ |
| 76 | pcap_if_t *dev; /* Device we're adding to the pcap_if_t list */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 77 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 78 | /* List starts out empty. */ |
| 79 | (*alldevs) = NULL; |
| 80 | lastdev = NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 81 | |
| 82 | if (strlen(source) > PCAP_BUF_SIZE) |
| 83 | { |
| 84 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "The source string is too long. Cannot handle it correctly."); |
| 85 | return -1; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Determine the type of the source (file, local, remote) |
| 90 | * There are some differences if pcap_findalldevs_ex() is called to list files and remote adapters. |
| 91 | * In the first case, the name of the directory we have to look into must be present (therefore |
| 92 | * the 'name' parameter of the pcap_parsesrcstr() is present). |
| 93 | * In the second case, the name of the adapter is not required (we need just the host). So, we have |
| 94 | * to use a first time this function to get the source type, and a second time to get the appropriate |
| 95 | * info, which depends on the source type. |
| 96 | */ |
| 97 | if (pcap_parsesrcstr(source, &type, NULL, NULL, NULL, errbuf) == -1) |
| 98 | return -1; |
| 99 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 100 | switch (type) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 101 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 102 | case PCAP_SRC_IFLOCAL: |
| 103 | if (pcap_parsesrcstr(source, &type, NULL, NULL, NULL, errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 104 | return -1; |
| 105 | |
| 106 | /* Initialize temporary string */ |
| 107 | tmpstring[PCAP_BUF_SIZE] = 0; |
| 108 | |
| 109 | /* The user wants to retrieve adapters from a local host */ |
| 110 | if (pcap_findalldevs(alldevs, errbuf) == -1) |
| 111 | return -1; |
| 112 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 113 | if (*alldevs == NULL) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 114 | { |
| 115 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 116 | "No interfaces found! Make sure libpcap/WinPcap is properly installed" |
| 117 | " on the local machine."); |
| 118 | return -1; |
| 119 | } |
| 120 | |
| 121 | /* Scan all the interfaces and modify name and description */ |
| 122 | /* This is a trick in order to avoid the re-implementation of the pcap_findalldevs here */ |
| 123 | dev = *alldevs; |
| 124 | while (dev) |
| 125 | { |
| 126 | /* Create the new device identifier */ |
| 127 | if (pcap_createsrcstr(tmpstring, PCAP_SRC_IFLOCAL, NULL, NULL, dev->name, errbuf) == -1) |
| 128 | return -1; |
| 129 | |
| 130 | /* Delete the old pointer */ |
| 131 | free(dev->name); |
| 132 | |
| 133 | /* Make a copy of the new device identifier */ |
| 134 | dev->name = strdup(tmpstring); |
| 135 | if (dev->name == NULL) |
| 136 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 137 | pcap_fmt_errmsg_for_errno(errbuf, |
| 138 | PCAP_ERRBUF_SIZE, errno, |
| 139 | "malloc() failed"); |
| 140 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | /* Create the new device description */ |
| 145 | if ((dev->description == NULL) || (dev->description[0] == 0)) |
| 146 | pcap_snprintf(tmpstring, sizeof(tmpstring) - 1, "%s '%s' %s", PCAP_TEXT_SOURCE_ADAPTER, |
| 147 | dev->name, PCAP_TEXT_SOURCE_ON_LOCAL_HOST); |
| 148 | else |
| 149 | pcap_snprintf(tmpstring, sizeof(tmpstring) - 1, "%s '%s' %s", PCAP_TEXT_SOURCE_ADAPTER, |
| 150 | dev->description, PCAP_TEXT_SOURCE_ON_LOCAL_HOST); |
| 151 | |
| 152 | /* Delete the old pointer */ |
| 153 | free(dev->description); |
| 154 | |
| 155 | /* Make a copy of the description */ |
| 156 | dev->description = strdup(tmpstring); |
| 157 | if (dev->description == NULL) |
| 158 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 159 | pcap_fmt_errmsg_for_errno(errbuf, |
| 160 | PCAP_ERRBUF_SIZE, errno, |
| 161 | "malloc() failed"); |
| 162 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 163 | return -1; |
| 164 | } |
| 165 | |
| 166 | dev = dev->next; |
| 167 | } |
| 168 | |
| 169 | return 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 170 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 171 | case PCAP_SRC_FILE: |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 172 | { |
| 173 | size_t stringlen; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 174 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 175 | WIN32_FIND_DATA filedata; |
| 176 | HANDLE filehandle; |
| 177 | #else |
| 178 | struct dirent *filedata; |
| 179 | DIR *unixdir; |
| 180 | #endif |
| 181 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 182 | if (pcap_parsesrcstr(source, &type, NULL, NULL, name, errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 183 | return -1; |
| 184 | |
| 185 | /* Check that the filename is correct */ |
| 186 | stringlen = strlen(name); |
| 187 | |
| 188 | /* The directory must end with '\' in Win32 and '/' in UNIX */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 189 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 190 | #define ENDING_CHAR '\\' |
| 191 | #else |
| 192 | #define ENDING_CHAR '/' |
| 193 | #endif |
| 194 | |
| 195 | if (name[stringlen - 1] != ENDING_CHAR) |
| 196 | { |
| 197 | name[stringlen] = ENDING_CHAR; |
| 198 | name[stringlen + 1] = 0; |
| 199 | |
| 200 | stringlen++; |
| 201 | } |
| 202 | |
| 203 | /* Save the path for future reference */ |
| 204 | pcap_snprintf(path, sizeof(path), "%s", name); |
| 205 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 206 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 207 | /* To perform directory listing, Win32 must have an 'asterisk' as ending char */ |
| 208 | if (name[stringlen - 1] != '*') |
| 209 | { |
| 210 | name[stringlen] = '*'; |
| 211 | name[stringlen + 1] = 0; |
| 212 | } |
| 213 | |
| 214 | filehandle = FindFirstFile(name, &filedata); |
| 215 | |
| 216 | if (filehandle == INVALID_HANDLE_VALUE) |
| 217 | { |
| 218 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Error when listing files: does folder '%s' exist?", path); |
| 219 | return -1; |
| 220 | } |
| 221 | |
| 222 | #else |
| 223 | /* opening the folder */ |
| 224 | unixdir= opendir(path); |
| 225 | |
| 226 | /* get the first file into it */ |
| 227 | filedata= readdir(unixdir); |
| 228 | |
| 229 | if (filedata == NULL) |
| 230 | { |
| 231 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Error when listing files: does folder '%s' exist?", path); |
| 232 | return -1; |
| 233 | } |
| 234 | #endif |
| 235 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 236 | /* Add all files we find to the list. */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 237 | do |
| 238 | { |
| 239 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 240 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 241 | pcap_snprintf(filename, sizeof(filename), "%s%s", path, filedata.cFileName); |
| 242 | #else |
| 243 | pcap_snprintf(filename, sizeof(filename), "%s%s", path, filedata->d_name); |
| 244 | #endif |
| 245 | |
| 246 | fp = pcap_open_offline(filename, errbuf); |
| 247 | |
| 248 | if (fp) |
| 249 | { |
| 250 | /* allocate the main structure */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 251 | dev = (pcap_if_t *)malloc(sizeof(pcap_if_t)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 252 | if (dev == NULL) |
| 253 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 254 | pcap_fmt_errmsg_for_errno(errbuf, |
| 255 | PCAP_ERRBUF_SIZE, errno, |
| 256 | "malloc() failed"); |
| 257 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | /* Initialize the structure to 'zero' */ |
| 262 | memset(dev, 0, sizeof(pcap_if_t)); |
| 263 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 264 | /* Append it to the list. */ |
| 265 | if (lastdev == NULL) |
| 266 | { |
| 267 | /* |
| 268 | * List is empty, so it's also |
| 269 | * the first device. |
| 270 | */ |
| 271 | *alldevs = dev; |
| 272 | } |
| 273 | else |
| 274 | { |
| 275 | /* |
| 276 | * Append after the last device. |
| 277 | */ |
| 278 | lastdev->next = dev; |
| 279 | } |
| 280 | /* It's now the last device. */ |
| 281 | lastdev = dev; |
| 282 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 283 | /* Create the new source identifier */ |
| 284 | if (pcap_createsrcstr(tmpstring, PCAP_SRC_FILE, NULL, NULL, filename, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 285 | { |
| 286 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 287 | return -1; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 288 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 289 | |
| 290 | stringlen = strlen(tmpstring); |
| 291 | |
| 292 | dev->name = (char *)malloc(stringlen + 1); |
| 293 | if (dev->name == NULL) |
| 294 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 295 | pcap_fmt_errmsg_for_errno(errbuf, |
| 296 | PCAP_ERRBUF_SIZE, errno, |
| 297 | "malloc() failed"); |
| 298 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 299 | return -1; |
| 300 | } |
| 301 | |
| 302 | strlcpy(dev->name, tmpstring, stringlen); |
| 303 | |
| 304 | dev->name[stringlen] = 0; |
| 305 | |
| 306 | /* Create the description */ |
| 307 | pcap_snprintf(tmpstring, sizeof(tmpstring) - 1, "%s '%s' %s", PCAP_TEXT_SOURCE_FILE, |
| 308 | filename, PCAP_TEXT_SOURCE_ON_LOCAL_HOST); |
| 309 | |
| 310 | stringlen = strlen(tmpstring); |
| 311 | |
| 312 | dev->description = (char *)malloc(stringlen + 1); |
| 313 | |
| 314 | if (dev->description == NULL) |
| 315 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 316 | pcap_fmt_errmsg_for_errno(errbuf, |
| 317 | PCAP_ERRBUF_SIZE, errno, |
| 318 | "malloc() failed"); |
| 319 | pcap_freealldevs(*alldevs); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 320 | return -1; |
| 321 | } |
| 322 | |
| 323 | /* Copy the new device description into the correct memory location */ |
| 324 | strlcpy(dev->description, tmpstring, stringlen + 1); |
| 325 | |
| 326 | pcap_close(fp); |
| 327 | } |
| 328 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 329 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 330 | while (FindNextFile(filehandle, &filedata) != 0); |
| 331 | #else |
| 332 | while ( (filedata= readdir(unixdir)) != NULL); |
| 333 | #endif |
| 334 | |
| 335 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 336 | #ifdef _WIN32 |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 337 | /* Close the search handle. */ |
| 338 | FindClose(filehandle); |
| 339 | #endif |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 344 | case PCAP_SRC_IFREMOTE: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 345 | return pcap_findalldevs_ex_remote(source, auth, alldevs, errbuf); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 346 | |
| 347 | default: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 348 | strlcpy(errbuf, "Source type not supported", PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 349 | return -1; |
| 350 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 353 | pcap_t *pcap_open(const char *source, int snaplen, int flags, int read_timeout, struct pcap_rmtauth *auth, char *errbuf) |
| 354 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 355 | char name[PCAP_BUF_SIZE]; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 356 | int type; |
| 357 | pcap_t *fp; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 358 | int status; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 359 | |
| 360 | if (strlen(source) > PCAP_BUF_SIZE) |
| 361 | { |
| 362 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "The source string is too long. Cannot handle it correctly."); |
| 363 | return NULL; |
| 364 | } |
| 365 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 366 | /* |
| 367 | * Determine the type of the source (file, local, remote) and, |
| 368 | * if it's file or local, the name of the file or capture device. |
| 369 | */ |
| 370 | if (pcap_parsesrcstr(source, &type, NULL, NULL, name, errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 371 | return NULL; |
| 372 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 373 | switch (type) |
| 374 | { |
| 375 | case PCAP_SRC_FILE: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 376 | return pcap_open_offline(name, errbuf); |
| 377 | |
| 378 | case PCAP_SRC_IFLOCAL: |
| 379 | fp = pcap_create(name, errbuf); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 380 | break; |
| 381 | |
| 382 | case PCAP_SRC_IFREMOTE: |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 383 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 384 | * Although we already have host, port and iface, we prefer |
| 385 | * to pass only 'source' to pcap_open_rpcap(), so that it |
| 386 | * has to call pcap_parsesrcstr() again. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 387 | * This is less optimized, but much clearer. |
| 388 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 389 | return pcap_open_rpcap(source, snaplen, flags, read_timeout, auth, errbuf); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 390 | |
| 391 | default: |
| 392 | strlcpy(errbuf, "Source type not supported", PCAP_ERRBUF_SIZE); |
| 393 | return NULL; |
| 394 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 395 | |
| 396 | if (fp == NULL) |
| 397 | return (NULL); |
| 398 | status = pcap_set_snaplen(fp, snaplen); |
| 399 | if (status < 0) |
| 400 | goto fail; |
| 401 | if (flags & PCAP_OPENFLAG_PROMISCUOUS) |
| 402 | { |
| 403 | status = pcap_set_promisc(fp, 1); |
| 404 | if (status < 0) |
| 405 | goto fail; |
| 406 | } |
| 407 | if (flags & PCAP_OPENFLAG_MAX_RESPONSIVENESS) |
| 408 | { |
| 409 | status = pcap_set_immediate_mode(fp, 1); |
| 410 | if (status < 0) |
| 411 | goto fail; |
| 412 | } |
| 413 | #ifdef _WIN32 |
| 414 | /* |
| 415 | * This flag is supported on Windows only. |
| 416 | * XXX - is there a way to support it with |
| 417 | * the capture mechanisms on UN*X? It's not |
| 418 | * exactly a "set direction" operation; I |
| 419 | * think it means "do not capture packets |
| 420 | * injected with pcap_sendpacket() or |
| 421 | * pcap_inject()". |
| 422 | */ |
| 423 | /* disable loopback capture if requested */ |
| 424 | if (flags & PCAP_OPENFLAG_NOCAPTURE_LOCAL) |
| 425 | fp->opt.nocapture_local = 1; |
| 426 | #endif /* _WIN32 */ |
| 427 | status = pcap_set_timeout(fp, read_timeout); |
| 428 | if (status < 0) |
| 429 | goto fail; |
| 430 | status = pcap_activate(fp); |
| 431 | if (status < 0) |
| 432 | goto fail; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 433 | return fp; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 434 | |
| 435 | fail: |
| 436 | if (status == PCAP_ERROR) |
| 437 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", |
| 438 | name, fp->errbuf); |
| 439 | else if (status == PCAP_ERROR_NO_SUCH_DEVICE || |
| 440 | status == PCAP_ERROR_PERM_DENIED || |
| 441 | status == PCAP_ERROR_PROMISC_PERM_DENIED) |
| 442 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", |
| 443 | name, pcap_statustostr(status), fp->errbuf); |
| 444 | else |
| 445 | pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", |
| 446 | name, pcap_statustostr(status)); |
| 447 | pcap_close(fp); |
| 448 | return NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | struct pcap_samp *pcap_setsampling(pcap_t *p) |
| 452 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 453 | return &p->rmt_samp; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 454 | } |