The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ |
| 2 | /* |
| 3 | * Copyright (c) 1994, 1995, 1996, 1997, 1998 |
| 4 | * The Regents of the University of California. 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 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. All advertising materials mentioning features or use of this software |
| 15 | * must display the following acknowledgement: |
| 16 | * This product includes software developed by the Computer Systems |
| 17 | * Engineering Group at Lawrence Berkeley Laboratory. |
| 18 | * 4. Neither the name of the University nor of the Laboratory may be used |
| 19 | * to endorse or promote products derived from this software without |
| 20 | * specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #ifndef lint |
| 36 | static const char rcsid[] _U_ = |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 37 | "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.79 2008-04-20 18:19:02 guy Exp $ (LBL)"; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 38 | #endif |
| 39 | |
| 40 | #ifdef HAVE_CONFIG_H |
| 41 | #include "config.h" |
| 42 | #endif |
| 43 | |
| 44 | #ifdef WIN32 |
| 45 | #include <pcap-stdinc.h> |
| 46 | #else /* WIN32 */ |
| 47 | |
| 48 | #include <sys/param.h> |
| 49 | #ifndef MSDOS |
| 50 | #include <sys/file.h> |
| 51 | #endif |
| 52 | #include <sys/ioctl.h> |
| 53 | #include <sys/socket.h> |
| 54 | #ifdef HAVE_SYS_SOCKIO_H |
| 55 | #include <sys/sockio.h> |
| 56 | #endif |
| 57 | |
| 58 | struct mbuf; /* Squelch compiler warnings on some platforms for */ |
| 59 | struct rtentry; /* declarations in <net/if.h> */ |
| 60 | #include <net/if.h> |
| 61 | #include <netinet/in.h> |
| 62 | #endif /* WIN32 */ |
| 63 | |
| 64 | #include <ctype.h> |
| 65 | #include <errno.h> |
| 66 | #include <memory.h> |
| 67 | #include <stdio.h> |
| 68 | #include <stdlib.h> |
| 69 | #include <string.h> |
| 70 | #if !defined(WIN32) && !defined(__BORLANDC__) |
| 71 | #include <unistd.h> |
| 72 | #endif /* !WIN32 && !__BORLANDC__ */ |
| 73 | #ifdef HAVE_LIMITS_H |
| 74 | #include <limits.h> |
| 75 | #else |
| 76 | #define INT_MAX 2147483647 |
| 77 | #endif |
| 78 | |
| 79 | #include "pcap-int.h" |
| 80 | |
| 81 | #ifdef HAVE_OS_PROTO_H |
| 82 | #include "os-proto.h" |
| 83 | #endif |
| 84 | |
| 85 | /* Not all systems have IFF_LOOPBACK */ |
| 86 | #ifdef IFF_LOOPBACK |
| 87 | #define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK) |
| 88 | #else |
| 89 | #define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \ |
| 90 | (isdigit((unsigned char)((name)[2])) || (name)[2] == '\0')) |
| 91 | #endif |
| 92 | |
| 93 | struct sockaddr * |
| 94 | dup_sockaddr(struct sockaddr *sa, size_t sa_length) |
| 95 | { |
| 96 | struct sockaddr *newsa; |
| 97 | |
| 98 | if ((newsa = malloc(sa_length)) == NULL) |
| 99 | return (NULL); |
| 100 | return (memcpy(newsa, sa, sa_length)); |
| 101 | } |
| 102 | |
| 103 | static int |
| 104 | get_instance(const char *name) |
| 105 | { |
| 106 | const char *cp, *endcp; |
| 107 | int n; |
| 108 | |
| 109 | if (strcmp(name, "any") == 0) { |
| 110 | /* |
| 111 | * Give the "any" device an artificially high instance |
| 112 | * number, so it shows up after all other non-loopback |
| 113 | * interfaces. |
| 114 | */ |
| 115 | return INT_MAX; |
| 116 | } |
| 117 | |
| 118 | endcp = name + strlen(name); |
| 119 | for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp) |
| 120 | continue; |
| 121 | |
| 122 | if (isdigit((unsigned char)*cp)) |
| 123 | n = atoi(cp); |
| 124 | else |
| 125 | n = 0; |
| 126 | return (n); |
| 127 | } |
| 128 | |
| 129 | int |
| 130 | add_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name, |
| 131 | u_int flags, const char *description, char *errbuf) |
| 132 | { |
| 133 | pcap_t *p; |
| 134 | pcap_if_t *curdev, *prevdev, *nextdev; |
| 135 | int this_instance; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 136 | char open_errbuf[PCAP_ERRBUF_SIZE]; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 137 | |
| 138 | /* |
| 139 | * Is there already an entry in the list for this interface? |
| 140 | */ |
| 141 | for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) { |
| 142 | if (strcmp(name, curdev->name) == 0) |
| 143 | break; /* yes, we found it */ |
| 144 | } |
| 145 | |
| 146 | if (curdev == NULL) { |
| 147 | /* |
| 148 | * No, we didn't find it. |
| 149 | * |
| 150 | * Can we open this interface for live capture? |
| 151 | * |
| 152 | * We do this check so that interfaces that are |
| 153 | * supplied by the interface enumeration mechanism |
| 154 | * we're using but that don't support packet capture |
| 155 | * aren't included in the list. Loopback interfaces |
| 156 | * on Solaris are an example of this; we don't just |
| 157 | * omit loopback interfaces on all platforms because |
| 158 | * you *can* capture on loopback interfaces on some |
| 159 | * OSes. |
| 160 | * |
| 161 | * On OS X, we don't do this check if the device |
| 162 | * name begins with "wlt"; at least some versions |
| 163 | * of OS X offer monitor mode capturing by having |
| 164 | * a separate "monitor mode" device for each wireless |
| 165 | * adapter, rather than by implementing the ioctls |
| 166 | * that {Free,Net,Open,DragonFly}BSD provide. |
| 167 | * Opening that device puts the adapter into monitor |
| 168 | * mode, which, at least for some adapters, causes |
| 169 | * them to deassociate from the network with which |
| 170 | * they're associated. |
| 171 | * |
| 172 | * Instead, we try to open the corresponding "en" |
| 173 | * device (so that we don't end up with, for users |
| 174 | * without sufficient privilege to open capture |
| 175 | * devices, a list of adapters that only includes |
| 176 | * the wlt devices). |
| 177 | */ |
| 178 | #ifdef __APPLE__ |
| 179 | if (strncmp(name, "wlt", 3) == 0) { |
| 180 | char *en_name; |
| 181 | size_t en_name_len; |
| 182 | |
| 183 | /* |
| 184 | * Try to allocate a buffer for the "en" |
| 185 | * device's name. |
| 186 | */ |
| 187 | en_name_len = strlen(name) - 1; |
| 188 | en_name = malloc(en_name_len + 1); |
| 189 | if (en_name == NULL) { |
| 190 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 191 | "malloc: %s", pcap_strerror(errno)); |
| 192 | return (-1); |
| 193 | } |
| 194 | strcpy(en_name, "en"); |
| 195 | strcat(en_name, name + 3); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 196 | p = pcap_open_live(en_name, 68, 0, 0, open_errbuf); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 197 | free(en_name); |
| 198 | } else |
| 199 | #endif /* __APPLE */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 200 | p = pcap_open_live(name, 68, 0, 0, open_errbuf); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 201 | if (p == NULL) { |
| 202 | /* |
| 203 | * No. Don't bother including it. |
| 204 | * Don't treat this as an error, though. |
| 205 | */ |
| 206 | *curdev_ret = NULL; |
| 207 | return (0); |
| 208 | } |
| 209 | pcap_close(p); |
| 210 | |
| 211 | /* |
| 212 | * Yes, we can open it. |
| 213 | * Allocate a new entry. |
| 214 | */ |
| 215 | curdev = malloc(sizeof(pcap_if_t)); |
| 216 | if (curdev == NULL) { |
| 217 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 218 | "malloc: %s", pcap_strerror(errno)); |
| 219 | return (-1); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Fill in the entry. |
| 224 | */ |
| 225 | curdev->next = NULL; |
| 226 | curdev->name = strdup(name); |
| 227 | if (curdev->name == NULL) { |
| 228 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 229 | "malloc: %s", pcap_strerror(errno)); |
| 230 | free(curdev); |
| 231 | return (-1); |
| 232 | } |
| 233 | if (description != NULL) { |
| 234 | /* |
| 235 | * We have a description for this interface. |
| 236 | */ |
| 237 | curdev->description = strdup(description); |
| 238 | if (curdev->description == NULL) { |
| 239 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 240 | "malloc: %s", pcap_strerror(errno)); |
| 241 | free(curdev->name); |
| 242 | free(curdev); |
| 243 | return (-1); |
| 244 | } |
| 245 | } else { |
| 246 | /* |
| 247 | * We don't. |
| 248 | */ |
| 249 | curdev->description = NULL; |
| 250 | } |
| 251 | curdev->addresses = NULL; /* list starts out as empty */ |
| 252 | curdev->flags = 0; |
| 253 | if (ISLOOPBACK(name, flags)) |
| 254 | curdev->flags |= PCAP_IF_LOOPBACK; |
| 255 | |
| 256 | /* |
| 257 | * Add it to the list, in the appropriate location. |
| 258 | * First, get the instance number of this interface. |
| 259 | */ |
| 260 | this_instance = get_instance(name); |
| 261 | |
| 262 | /* |
| 263 | * Now look for the last interface with an instance number |
| 264 | * less than or equal to the new interface's instance |
| 265 | * number - except that non-loopback interfaces are |
| 266 | * arbitrarily treated as having interface numbers less |
| 267 | * than those of loopback interfaces, so the loopback |
| 268 | * interfaces are put at the end of the list. |
| 269 | * |
| 270 | * We start with "prevdev" being NULL, meaning we're before |
| 271 | * the first element in the list. |
| 272 | */ |
| 273 | prevdev = NULL; |
| 274 | for (;;) { |
| 275 | /* |
| 276 | * Get the interface after this one. |
| 277 | */ |
| 278 | if (prevdev == NULL) { |
| 279 | /* |
| 280 | * The next element is the first element. |
| 281 | */ |
| 282 | nextdev = *alldevs; |
| 283 | } else |
| 284 | nextdev = prevdev->next; |
| 285 | |
| 286 | /* |
| 287 | * Are we at the end of the list? |
| 288 | */ |
| 289 | if (nextdev == NULL) { |
| 290 | /* |
| 291 | * Yes - we have to put the new entry |
| 292 | * after "prevdev". |
| 293 | */ |
| 294 | break; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * Is the new interface a non-loopback interface |
| 299 | * and the next interface a loopback interface? |
| 300 | */ |
| 301 | if (!(curdev->flags & PCAP_IF_LOOPBACK) && |
| 302 | (nextdev->flags & PCAP_IF_LOOPBACK)) { |
| 303 | /* |
| 304 | * Yes, we should put the new entry |
| 305 | * before "nextdev", i.e. after "prevdev". |
| 306 | */ |
| 307 | break; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Is the new interface's instance number less |
| 312 | * than the next interface's instance number, |
| 313 | * and is it the case that the new interface is a |
| 314 | * non-loopback interface or the next interface is |
| 315 | * a loopback interface? |
| 316 | * |
| 317 | * (The goal of both loopback tests is to make |
| 318 | * sure that we never put a loopback interface |
| 319 | * before any non-loopback interface and that we |
| 320 | * always put a non-loopback interface before all |
| 321 | * loopback interfaces.) |
| 322 | */ |
| 323 | if (this_instance < get_instance(nextdev->name) && |
| 324 | (!(curdev->flags & PCAP_IF_LOOPBACK) || |
| 325 | (nextdev->flags & PCAP_IF_LOOPBACK))) { |
| 326 | /* |
| 327 | * Yes - we should put the new entry |
| 328 | * before "nextdev", i.e. after "prevdev". |
| 329 | */ |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | prevdev = nextdev; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Insert before "nextdev". |
| 338 | */ |
| 339 | curdev->next = nextdev; |
| 340 | |
| 341 | /* |
| 342 | * Insert after "prevdev" - unless "prevdev" is null, |
| 343 | * in which case this is the first interface. |
| 344 | */ |
| 345 | if (prevdev == NULL) { |
| 346 | /* |
| 347 | * This is the first interface. Pass back a |
| 348 | * pointer to it, and put "curdev" before |
| 349 | * "nextdev". |
| 350 | */ |
| 351 | *alldevs = curdev; |
| 352 | } else |
| 353 | prevdev->next = curdev; |
| 354 | } |
| 355 | |
| 356 | *curdev_ret = curdev; |
| 357 | return (0); |
| 358 | } |
| 359 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 360 | /* |
| 361 | * XXX - on FreeBSDs that support it, should it get the sysctl named |
| 362 | * "dev.{adapter family name}.{adapter unit}.%desc" to get a description |
| 363 | * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800" |
| 364 | * with my Cisco 350 card, so the name isn't entirely descriptive. The |
| 365 | * "dev.an.0.%pnpinfo" has a better description, although one might argue |
| 366 | * that the problem is really a driver bug - if it can find out that it's |
| 367 | * a Cisco 340 or 350, rather than an old Aironet card, it should use |
| 368 | * that in the description. |
| 369 | * |
| 370 | * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD |
| 371 | * and OpenBSD let you get a description, but it's not generated by the OS, |
| 372 | * it's set with another ioctl that ifconfig supports; we use that to get |
| 373 | * a description in FreeBSD and OpenBSD, but if there is no such |
| 374 | * description available, it still might be nice to get some description |
| 375 | * string based on the device type or something such as that. |
| 376 | * |
| 377 | * In OS X, the System Configuration framework can apparently return |
| 378 | * names in 10.4 and later. |
| 379 | * |
| 380 | * It also appears that freedesktop.org's HAL offers an "info.product" |
| 381 | * string, but the HAL specification says it "should not be used in any |
| 382 | * UI" and "subsystem/capability specific properties" should be used |
| 383 | * instead and, in any case, I think HAL is being deprecated in |
| 384 | * favor of other stuff such as DeviceKit. DeviceKit doesn't appear |
| 385 | * to have any obvious product information for devices, but maybe |
| 386 | * I haven't looked hard enough. |
| 387 | * |
| 388 | * Using the System Configuration framework, or HAL, or DeviceKit, or |
| 389 | * whatever, would require that libpcap applications be linked with |
| 390 | * the frameworks/libraries in question. That shouldn't be a problem |
| 391 | * for programs linking with the shared version of libpcap (unless |
| 392 | * you're running on AIX - which I think is the only UN*X that doesn't |
| 393 | * support linking a shared library with other libraries on which it |
| 394 | * depends, and having an executable linked only with the first shared |
| 395 | * library automatically pick up the other libraries when started - |
| 396 | * and using HAL or whatever). Programs linked with the static |
| 397 | * version of libpcap would have to use pcap-config with the --static |
| 398 | * flag in order to get the right linker flags in order to pick up |
| 399 | * the additional libraries/frameworks; those programs need that anyway |
| 400 | * for libpcap 1.1 and beyond on Linux, as, by default, it requires |
| 401 | * -lnl. |
| 402 | * |
| 403 | * Do any other UN*Xes, or desktop environments support getting a |
| 404 | * description? |
| 405 | */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 406 | int |
| 407 | add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags, |
| 408 | struct sockaddr *addr, size_t addr_size, |
| 409 | struct sockaddr *netmask, size_t netmask_size, |
| 410 | struct sockaddr *broadaddr, size_t broadaddr_size, |
| 411 | struct sockaddr *dstaddr, size_t dstaddr_size, |
| 412 | char *errbuf) |
| 413 | { |
| 414 | pcap_if_t *curdev; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 415 | char *description = NULL; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 416 | pcap_addr_t *curaddr, *prevaddr, *nextaddr; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 417 | #ifdef SIOCGIFDESCR |
| 418 | int s; |
| 419 | struct ifreq ifrdesc; |
| 420 | #ifndef IFDESCRSIZE |
| 421 | size_t descrlen = 64; |
| 422 | #else |
| 423 | size_t descrlen = IFDESCRSIZE; |
| 424 | #endif /* IFDESCRSIZE */ |
| 425 | #endif /* SIOCGIFDESCR */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 426 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 427 | #ifdef SIOCGIFDESCR |
| 428 | /* |
| 429 | * Get the description for the interface. |
| 430 | */ |
| 431 | memset(&ifrdesc, 0, sizeof ifrdesc); |
| 432 | strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name); |
| 433 | s = socket(AF_INET, SOCK_DGRAM, 0); |
| 434 | if (s >= 0) { |
| 435 | #ifdef __FreeBSD__ |
| 436 | /* |
| 437 | * On FreeBSD, if the buffer isn't big enough for the |
| 438 | * description, the ioctl succeeds, but the description |
| 439 | * isn't copied, ifr_buffer.length is set to the description |
| 440 | * length, and ifr_buffer.buffer is set to NULL. |
| 441 | */ |
| 442 | for (;;) { |
| 443 | free(description); |
| 444 | if ((description = malloc(descrlen)) != NULL) { |
| 445 | ifrdesc.ifr_buffer.buffer = description; |
| 446 | ifrdesc.ifr_buffer.length = descrlen; |
| 447 | if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) { |
| 448 | if (ifrdesc.ifr_buffer.buffer == |
| 449 | description) |
| 450 | break; |
| 451 | else |
| 452 | descrlen = ifrdesc.ifr_buffer.length; |
| 453 | } else { |
| 454 | /* |
| 455 | * Failed to get interface description. |
| 456 | */ |
| 457 | free(description); |
| 458 | description = NULL; |
| 459 | break; |
| 460 | } |
| 461 | } else |
| 462 | break; |
| 463 | } |
| 464 | #else /* __FreeBSD__ */ |
| 465 | /* |
| 466 | * The only other OS that currently supports |
| 467 | * SIOCGIFDESCR is OpenBSD, and it has no way |
| 468 | * to get the description length - it's clamped |
| 469 | * to a maximum of IFDESCRSIZE. |
| 470 | */ |
| 471 | if ((description = malloc(descrlen)) != NULL) { |
| 472 | ifrdesc.ifr_data = (caddr_t)description; |
| 473 | if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) { |
| 474 | /* |
| 475 | * Failed to get interface description. |
| 476 | */ |
| 477 | free(description); |
| 478 | description = NULL; |
| 479 | } |
| 480 | } |
| 481 | #endif /* __FreeBSD__ */ |
| 482 | close(s); |
| 483 | if (description != NULL && strlen(description) == 0) { |
| 484 | free(description); |
| 485 | description = NULL; |
| 486 | } |
| 487 | } |
| 488 | #endif /* SIOCGIFDESCR */ |
| 489 | |
| 490 | if (add_or_find_if(&curdev, alldevs, name, flags, description, |
| 491 | errbuf) == -1) { |
| 492 | free(description); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 493 | /* |
| 494 | * Error - give up. |
| 495 | */ |
| 496 | return (-1); |
| 497 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 498 | free(description); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 499 | if (curdev == NULL) { |
| 500 | /* |
| 501 | * Device wasn't added because it can't be opened. |
| 502 | * Not a fatal error. |
| 503 | */ |
| 504 | return (0); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * "curdev" is an entry for this interface; add an entry for this |
| 509 | * address to its list of addresses. |
| 510 | * |
| 511 | * Allocate the new entry and fill it in. |
| 512 | */ |
| 513 | curaddr = malloc(sizeof(pcap_addr_t)); |
| 514 | if (curaddr == NULL) { |
| 515 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 516 | "malloc: %s", pcap_strerror(errno)); |
| 517 | return (-1); |
| 518 | } |
| 519 | |
| 520 | curaddr->next = NULL; |
| 521 | if (addr != NULL) { |
| 522 | curaddr->addr = dup_sockaddr(addr, addr_size); |
| 523 | if (curaddr->addr == NULL) { |
| 524 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 525 | "malloc: %s", pcap_strerror(errno)); |
| 526 | free(curaddr); |
| 527 | return (-1); |
| 528 | } |
| 529 | } else |
| 530 | curaddr->addr = NULL; |
| 531 | |
| 532 | if (netmask != NULL) { |
| 533 | curaddr->netmask = dup_sockaddr(netmask, netmask_size); |
| 534 | if (curaddr->netmask == NULL) { |
| 535 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 536 | "malloc: %s", pcap_strerror(errno)); |
| 537 | if (curaddr->addr != NULL) |
| 538 | free(curaddr->addr); |
| 539 | free(curaddr); |
| 540 | return (-1); |
| 541 | } |
| 542 | } else |
| 543 | curaddr->netmask = NULL; |
| 544 | |
| 545 | if (broadaddr != NULL) { |
| 546 | curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size); |
| 547 | if (curaddr->broadaddr == NULL) { |
| 548 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 549 | "malloc: %s", pcap_strerror(errno)); |
| 550 | if (curaddr->netmask != NULL) |
| 551 | free(curaddr->netmask); |
| 552 | if (curaddr->addr != NULL) |
| 553 | free(curaddr->addr); |
| 554 | free(curaddr); |
| 555 | return (-1); |
| 556 | } |
| 557 | } else |
| 558 | curaddr->broadaddr = NULL; |
| 559 | |
| 560 | if (dstaddr != NULL) { |
| 561 | curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size); |
| 562 | if (curaddr->dstaddr == NULL) { |
| 563 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 564 | "malloc: %s", pcap_strerror(errno)); |
| 565 | if (curaddr->broadaddr != NULL) |
| 566 | free(curaddr->broadaddr); |
| 567 | if (curaddr->netmask != NULL) |
| 568 | free(curaddr->netmask); |
| 569 | if (curaddr->addr != NULL) |
| 570 | free(curaddr->addr); |
| 571 | free(curaddr); |
| 572 | return (-1); |
| 573 | } |
| 574 | } else |
| 575 | curaddr->dstaddr = NULL; |
| 576 | |
| 577 | /* |
| 578 | * Find the end of the list of addresses. |
| 579 | */ |
| 580 | for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { |
| 581 | nextaddr = prevaddr->next; |
| 582 | if (nextaddr == NULL) { |
| 583 | /* |
| 584 | * This is the end of the list. |
| 585 | */ |
| 586 | break; |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | if (prevaddr == NULL) { |
| 591 | /* |
| 592 | * The list was empty; this is the first member. |
| 593 | */ |
| 594 | curdev->addresses = curaddr; |
| 595 | } else { |
| 596 | /* |
| 597 | * "prevaddr" is the last member of the list; append |
| 598 | * this member to it. |
| 599 | */ |
| 600 | prevaddr->next = curaddr; |
| 601 | } |
| 602 | |
| 603 | return (0); |
| 604 | } |
| 605 | |
| 606 | int |
| 607 | pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags, |
| 608 | const char *description, char *errbuf) |
| 609 | { |
| 610 | pcap_if_t *curdev; |
| 611 | |
| 612 | return (add_or_find_if(&curdev, devlist, name, flags, description, |
| 613 | errbuf)); |
| 614 | } |
| 615 | |
| 616 | |
| 617 | /* |
| 618 | * Free a list of interfaces. |
| 619 | */ |
| 620 | void |
| 621 | pcap_freealldevs(pcap_if_t *alldevs) |
| 622 | { |
| 623 | pcap_if_t *curdev, *nextdev; |
| 624 | pcap_addr_t *curaddr, *nextaddr; |
| 625 | |
| 626 | for (curdev = alldevs; curdev != NULL; curdev = nextdev) { |
| 627 | nextdev = curdev->next; |
| 628 | |
| 629 | /* |
| 630 | * Free all addresses. |
| 631 | */ |
| 632 | for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { |
| 633 | nextaddr = curaddr->next; |
| 634 | if (curaddr->addr) |
| 635 | free(curaddr->addr); |
| 636 | if (curaddr->netmask) |
| 637 | free(curaddr->netmask); |
| 638 | if (curaddr->broadaddr) |
| 639 | free(curaddr->broadaddr); |
| 640 | if (curaddr->dstaddr) |
| 641 | free(curaddr->dstaddr); |
| 642 | free(curaddr); |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Free the name string. |
| 647 | */ |
| 648 | free(curdev->name); |
| 649 | |
| 650 | /* |
| 651 | * Free the description string, if any. |
| 652 | */ |
| 653 | if (curdev->description != NULL) |
| 654 | free(curdev->description); |
| 655 | |
| 656 | /* |
| 657 | * Free the interface. |
| 658 | */ |
| 659 | free(curdev); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | #if !defined(WIN32) && !defined(MSDOS) |
| 664 | |
| 665 | /* |
| 666 | * Return the name of a network interface attached to the system, or NULL |
| 667 | * if none can be found. The interface must be configured up; the |
| 668 | * lowest unit number is preferred; loopback is ignored. |
| 669 | */ |
| 670 | char * |
| 671 | pcap_lookupdev(errbuf) |
| 672 | register char *errbuf; |
| 673 | { |
| 674 | pcap_if_t *alldevs; |
| 675 | /* for old BSD systems, including bsdi3 */ |
| 676 | #ifndef IF_NAMESIZE |
| 677 | #define IF_NAMESIZE IFNAMSIZ |
| 678 | #endif |
| 679 | static char device[IF_NAMESIZE + 1]; |
| 680 | char *ret; |
| 681 | |
| 682 | if (pcap_findalldevs(&alldevs, errbuf) == -1) |
| 683 | return (NULL); |
| 684 | |
| 685 | if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { |
| 686 | /* |
| 687 | * There are no devices on the list, or the first device |
| 688 | * on the list is a loopback device, which means there |
| 689 | * are no non-loopback devices on the list. This means |
| 690 | * we can't return any device. |
| 691 | * |
| 692 | * XXX - why not return a loopback device? If we can't |
| 693 | * capture on it, it won't be on the list, and if it's |
| 694 | * on the list, there aren't any non-loopback devices, |
| 695 | * so why not just supply it as the default device? |
| 696 | */ |
| 697 | (void)strlcpy(errbuf, "no suitable device found", |
| 698 | PCAP_ERRBUF_SIZE); |
| 699 | ret = NULL; |
| 700 | } else { |
| 701 | /* |
| 702 | * Return the name of the first device on the list. |
| 703 | */ |
| 704 | (void)strlcpy(device, alldevs->name, sizeof(device)); |
| 705 | ret = device; |
| 706 | } |
| 707 | |
| 708 | pcap_freealldevs(alldevs); |
| 709 | return (ret); |
| 710 | } |
| 711 | |
| 712 | int |
| 713 | pcap_lookupnet(device, netp, maskp, errbuf) |
| 714 | register const char *device; |
| 715 | register bpf_u_int32 *netp, *maskp; |
| 716 | register char *errbuf; |
| 717 | { |
| 718 | register int fd; |
| 719 | register struct sockaddr_in *sin4; |
| 720 | struct ifreq ifr; |
| 721 | |
| 722 | /* |
| 723 | * The pseudo-device "any" listens on all interfaces and therefore |
| 724 | * has the network address and -mask "0.0.0.0" therefore catching |
| 725 | * all traffic. Using NULL for the interface is the same as "any". |
| 726 | */ |
| 727 | if (!device || strcmp(device, "any") == 0 |
| 728 | #ifdef HAVE_DAG_API |
| 729 | || strstr(device, "dag") != NULL |
| 730 | #endif |
| 731 | #ifdef HAVE_SEPTEL_API |
| 732 | || strstr(device, "septel") != NULL |
| 733 | #endif |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 734 | #ifdef PCAP_SUPPORT_BT |
| 735 | || strstr(device, "bluetooth") != NULL |
| 736 | #endif |
| 737 | #ifdef PCAP_SUPPORT_USB |
| 738 | || strstr(device, "usbmon") != NULL |
| 739 | #endif |
| 740 | #ifdef HAVE_SNF_API |
| 741 | || strstr(device, "snf") != NULL |
| 742 | #endif |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 743 | ) { |
| 744 | *netp = *maskp = 0; |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 749 | if (fd < 0) { |
| 750 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s", |
| 751 | pcap_strerror(errno)); |
| 752 | return (-1); |
| 753 | } |
| 754 | memset(&ifr, 0, sizeof(ifr)); |
| 755 | #ifdef linux |
| 756 | /* XXX Work around Linux kernel bug */ |
| 757 | ifr.ifr_addr.sa_family = AF_INET; |
| 758 | #endif |
| 759 | (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); |
| 760 | if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { |
| 761 | if (errno == EADDRNOTAVAIL) { |
| 762 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 763 | "%s: no IPv4 address assigned", device); |
| 764 | } else { |
| 765 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 766 | "SIOCGIFADDR: %s: %s", |
| 767 | device, pcap_strerror(errno)); |
| 768 | } |
| 769 | (void)close(fd); |
| 770 | return (-1); |
| 771 | } |
| 772 | sin4 = (struct sockaddr_in *)&ifr.ifr_addr; |
| 773 | *netp = sin4->sin_addr.s_addr; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 774 | memset(&ifr, 0, sizeof(ifr)); |
| 775 | #ifdef linux |
| 776 | /* XXX Work around Linux kernel bug */ |
| 777 | ifr.ifr_addr.sa_family = AF_INET; |
| 778 | #endif |
| 779 | (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 780 | if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { |
| 781 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 782 | "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno)); |
| 783 | (void)close(fd); |
| 784 | return (-1); |
| 785 | } |
| 786 | (void)close(fd); |
| 787 | *maskp = sin4->sin_addr.s_addr; |
| 788 | if (*maskp == 0) { |
| 789 | if (IN_CLASSA(*netp)) |
| 790 | *maskp = IN_CLASSA_NET; |
| 791 | else if (IN_CLASSB(*netp)) |
| 792 | *maskp = IN_CLASSB_NET; |
| 793 | else if (IN_CLASSC(*netp)) |
| 794 | *maskp = IN_CLASSC_NET; |
| 795 | else { |
| 796 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 797 | "inet class for 0x%x unknown", *netp); |
| 798 | return (-1); |
| 799 | } |
| 800 | } |
| 801 | *netp &= *maskp; |
| 802 | return (0); |
| 803 | } |
| 804 | |
| 805 | #elif defined(WIN32) |
| 806 | |
| 807 | /* |
| 808 | * Return the name of a network interface attached to the system, or NULL |
| 809 | * if none can be found. The interface must be configured up; the |
| 810 | * lowest unit number is preferred; loopback is ignored. |
| 811 | */ |
| 812 | char * |
| 813 | pcap_lookupdev(errbuf) |
| 814 | register char *errbuf; |
| 815 | { |
| 816 | DWORD dwVersion; |
| 817 | DWORD dwWindowsMajorVersion; |
| 818 | dwVersion = GetVersion(); /* get the OS version */ |
| 819 | dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion))); |
| 820 | |
| 821 | if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) { |
| 822 | /* |
| 823 | * Windows 95, 98, ME. |
| 824 | */ |
| 825 | ULONG NameLength = 8192; |
| 826 | static char AdaptersName[8192]; |
| 827 | |
| 828 | if (PacketGetAdapterNames(AdaptersName,&NameLength) ) |
| 829 | return (AdaptersName); |
| 830 | else |
| 831 | return NULL; |
| 832 | } else { |
| 833 | /* |
| 834 | * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility |
| 835 | */ |
| 836 | ULONG NameLength = 8192; |
| 837 | static WCHAR AdaptersName[8192]; |
| 838 | char *tAstr; |
| 839 | WCHAR *tUstr; |
| 840 | WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR)); |
| 841 | int NAdapts = 0; |
| 842 | |
| 843 | if(TAdaptersName == NULL) |
| 844 | { |
| 845 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure"); |
| 846 | return NULL; |
| 847 | } |
| 848 | |
| 849 | if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) ) |
| 850 | { |
| 851 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 852 | "PacketGetAdapterNames: %s", |
| 853 | pcap_win32strerror()); |
| 854 | free(TAdaptersName); |
| 855 | return NULL; |
| 856 | } |
| 857 | |
| 858 | |
| 859 | tAstr = (char*)TAdaptersName; |
| 860 | tUstr = (WCHAR*)AdaptersName; |
| 861 | |
| 862 | /* |
| 863 | * Convert and copy the device names |
| 864 | */ |
| 865 | while(sscanf(tAstr, "%S", tUstr) > 0) |
| 866 | { |
| 867 | tAstr += strlen(tAstr) + 1; |
| 868 | tUstr += wcslen(tUstr) + 1; |
| 869 | NAdapts ++; |
| 870 | } |
| 871 | |
| 872 | tAstr++; |
| 873 | *tUstr = 0; |
| 874 | tUstr++; |
| 875 | |
| 876 | /* |
| 877 | * Copy the descriptions |
| 878 | */ |
| 879 | while(NAdapts--) |
| 880 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 881 | char* tmp = (char*)tUstr; |
| 882 | strcpy(tmp, tAstr); |
| 883 | tmp += strlen(tAstr) + 1; |
| 884 | tUstr = (WCHAR*)tmp; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 885 | tAstr += strlen(tAstr) + 1; |
| 886 | } |
| 887 | |
| 888 | free(TAdaptersName); |
| 889 | return (char *)(AdaptersName); |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | |
| 894 | int |
| 895 | pcap_lookupnet(device, netp, maskp, errbuf) |
| 896 | register const char *device; |
| 897 | register bpf_u_int32 *netp, *maskp; |
| 898 | register char *errbuf; |
| 899 | { |
| 900 | /* |
| 901 | * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo() |
| 902 | * in order to skip non IPv4 (i.e. IPv6 addresses) |
| 903 | */ |
| 904 | npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES]; |
| 905 | LONG if_addr_size = 1; |
| 906 | struct sockaddr_in *t_addr; |
| 907 | unsigned int i; |
| 908 | |
| 909 | if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) { |
| 910 | *netp = *maskp = 0; |
| 911 | return (0); |
| 912 | } |
| 913 | |
| 914 | for(i=0; i<MAX_NETWORK_ADDRESSES; i++) |
| 915 | { |
| 916 | if(if_addrs[i].IPAddress.ss_family == AF_INET) |
| 917 | { |
| 918 | t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress); |
| 919 | *netp = t_addr->sin_addr.S_un.S_addr; |
| 920 | t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask); |
| 921 | *maskp = t_addr->sin_addr.S_un.S_addr; |
| 922 | |
| 923 | *netp &= *maskp; |
| 924 | return (0); |
| 925 | } |
| 926 | |
| 927 | } |
| 928 | |
| 929 | *netp = *maskp = 0; |
| 930 | return (0); |
| 931 | } |
| 932 | |
| 933 | #endif /* !WIN32 && !MSDOS */ |