1 /* $NetBSD: pcap-libdlpi.c,v 1.2 2014/11/19 19:33:30 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * This code contributed by Sagun Shakya (sagun.shakya@sun.com) 24 */ 25 /* 26 * Packet capture routines for DLPI using libdlpi under SunOS 5.11. 27 */ 28 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: pcap-libdlpi.c,v 1.2 2014/11/19 19:33:30 christos Exp $"); 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <sys/types.h> 37 #include <sys/time.h> 38 #include <sys/bufmod.h> 39 #include <sys/stream.h> 40 #include <libdlpi.h> 41 #include <errno.h> 42 #include <memory.h> 43 #include <stropts.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #include "pcap-int.h" 49 #include "dlpisubs.h" 50 51 /* Forwards. */ 52 static int dlpromiscon(pcap_t *, bpf_u_int32); 53 static int pcap_read_libdlpi(pcap_t *, int, pcap_handler, u_char *); 54 static int pcap_inject_libdlpi(pcap_t *, const void *, size_t); 55 static void pcap_libdlpi_err(const char *, const char *, int, char *); 56 static void pcap_cleanup_libdlpi(pcap_t *); 57 58 /* 59 * list_interfaces() will list all the network links that are 60 * available on a system. 61 */ 62 static boolean_t list_interfaces(const char *, void *); 63 64 typedef struct linknamelist { 65 char linkname[DLPI_LINKNAME_MAX]; 66 struct linknamelist *lnl_next; 67 } linknamelist_t; 68 69 typedef struct linkwalk { 70 linknamelist_t *lw_list; 71 int lw_err; 72 } linkwalk_t; 73 74 /* 75 * The caller of this function should free the memory allocated 76 * for each linknamelist_t "entry" allocated. 77 */ 78 static boolean_t 79 list_interfaces(const char *linkname, void *arg) 80 { 81 linkwalk_t *lwp = arg; 82 linknamelist_t *entry; 83 84 if ((entry = calloc(1, sizeof(linknamelist_t))) == NULL) { 85 lwp->lw_err = ENOMEM; 86 return (B_TRUE); 87 } 88 (void) strlcpy(entry->linkname, linkname, DLPI_LINKNAME_MAX); 89 90 if (lwp->lw_list == NULL) { 91 lwp->lw_list = entry; 92 } else { 93 entry->lnl_next = lwp->lw_list; 94 lwp->lw_list = entry; 95 } 96 97 return (B_FALSE); 98 } 99 100 static int 101 pcap_activate_libdlpi(pcap_t *p) 102 { 103 struct pcap_dlpi *pd = p->priv; 104 int status = 0; 105 int retv; 106 dlpi_handle_t dh; 107 dlpi_info_t dlinfo; 108 109 /* 110 * Enable Solaris raw and passive DLPI extensions; 111 * dlpi_open() will not fail if the underlying link does not support 112 * passive mode. See dlpi(7P) for details. 113 */ 114 retv = dlpi_open(p->opt.source, &dh, DLPI_RAW|DLPI_PASSIVE); 115 if (retv != DLPI_SUCCESS) { 116 if (retv == DLPI_ELINKNAMEINVAL || retv == DLPI_ENOLINK) 117 status = PCAP_ERROR_NO_SUCH_DEVICE; 118 else if (retv == DL_SYSERR && 119 (errno == EPERM || errno == EACCES)) 120 status = PCAP_ERROR_PERM_DENIED; 121 else 122 status = PCAP_ERROR; 123 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv, 124 p->errbuf); 125 return (status); 126 } 127 pd->dlpi_hd = dh; 128 129 if (p->opt.rfmon) { 130 /* 131 * This device exists, but we don't support monitor mode 132 * any platforms that support DLPI. 133 */ 134 status = PCAP_ERROR_RFMON_NOTSUP; 135 goto bad; 136 } 137 138 /* Bind with DLPI_ANY_SAP. */ 139 if ((retv = dlpi_bind(pd->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) { 140 status = PCAP_ERROR; 141 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf); 142 goto bad; 143 } 144 145 /* Enable promiscuous mode. */ 146 if (p->opt.promisc) { 147 retv = dlpromiscon(p, DL_PROMISC_PHYS); 148 if (retv < 0) { 149 /* 150 * "You don't have permission to capture on 151 * this device" and "you don't have permission 152 * to capture in promiscuous mode on this 153 * device" are different; let the user know, 154 * so if they can't get permission to 155 * capture in promiscuous mode, they can at 156 * least try to capture in non-promiscuous 157 * mode. 158 * 159 * XXX - you might have to capture in 160 * promiscuous mode to see outgoing packets. 161 */ 162 if (retv == PCAP_ERROR_PERM_DENIED) 163 status = PCAP_ERROR_PROMISC_PERM_DENIED; 164 else 165 status = retv; 166 goto bad; 167 } 168 } else { 169 /* Try to enable multicast. */ 170 retv = dlpromiscon(p, DL_PROMISC_MULTI); 171 if (retv < 0) { 172 status = retv; 173 goto bad; 174 } 175 } 176 177 /* Try to enable SAP promiscuity. */ 178 retv = dlpromiscon(p, DL_PROMISC_SAP); 179 if (retv < 0) { 180 /* 181 * Not fatal, since the DL_PROMISC_PHYS mode worked. 182 * Report it as a warning, however. 183 */ 184 if (p->opt.promisc) 185 status = PCAP_WARNING; 186 else { 187 status = retv; 188 goto bad; 189 } 190 } 191 192 /* Determine link type. */ 193 if ((retv = dlpi_info(pd->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) { 194 status = PCAP_ERROR; 195 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf); 196 goto bad; 197 } 198 199 if (pcap_process_mactype(p, dlinfo.di_mactype) != 0) { 200 status = PCAP_ERROR; 201 goto bad; 202 } 203 204 p->fd = dlpi_fd(pd->dlpi_hd); 205 206 /* Push and configure bufmod. */ 207 if (pcap_conf_bufmod(p, p->snapshot) != 0) { 208 status = PCAP_ERROR; 209 goto bad; 210 } 211 212 /* 213 * Flush the read side. 214 */ 215 if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) { 216 status = PCAP_ERROR; 217 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s", 218 pcap_strerror(errno)); 219 goto bad; 220 } 221 222 /* Allocate data buffer. */ 223 if (pcap_alloc_databuf(p) != 0) { 224 status = PCAP_ERROR; 225 goto bad; 226 } 227 228 /* 229 * "p->fd" is a FD for a STREAMS device, so "select()" and 230 * "poll()" should work on it. 231 */ 232 p->selectable_fd = p->fd; 233 234 p->read_op = pcap_read_libdlpi; 235 p->inject_op = pcap_inject_libdlpi; 236 p->setfilter_op = install_bpf_program; /* No kernel filtering */ 237 p->setdirection_op = NULL; /* Not implemented */ 238 p->set_datalink_op = NULL; /* Can't change data link type */ 239 p->getnonblock_op = pcap_getnonblock_fd; 240 p->setnonblock_op = pcap_setnonblock_fd; 241 p->stats_op = pcap_stats_dlpi; 242 p->cleanup_op = pcap_cleanup_libdlpi; 243 244 return (status); 245 bad: 246 pcap_cleanup_libdlpi(p); 247 return (status); 248 } 249 250 #define STRINGIFY(n) #n 251 252 static int 253 dlpromiscon(pcap_t *p, bpf_u_int32 level) 254 { 255 struct pcap_dlpi *pd = p->priv; 256 int retv; 257 int err; 258 259 retv = dlpi_promiscon(pd->dlpi_hd, level); 260 if (retv != DLPI_SUCCESS) { 261 if (retv == DL_SYSERR && 262 (errno == EPERM || errno == EACCES)) 263 err = PCAP_ERROR_PERM_DENIED; 264 else 265 err = PCAP_ERROR; 266 pcap_libdlpi_err(p->opt.source, "dlpi_promiscon" STRINGIFY(level), 267 retv, p->errbuf); 268 return (err); 269 } 270 return (0); 271 } 272 273 /* 274 * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find 275 * network links that are plumbed and are up. dlpi_walk(3DLPI) will find 276 * additional network links present in the system. 277 */ 278 int 279 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) 280 { 281 int retv = 0; 282 283 linknamelist_t *entry, *next; 284 linkwalk_t lw = {NULL, 0}; 285 int save_errno; 286 287 /* dlpi_walk() for loopback will be added here. */ 288 289 dlpi_walk(list_interfaces, &lw, 0); 290 291 if (lw.lw_err != 0) { 292 snprintf(errbuf, PCAP_ERRBUF_SIZE, 293 "dlpi_walk: %s", pcap_strerror(lw.lw_err)); 294 retv = -1; 295 goto done; 296 } 297 298 /* Add linkname if it does not exist on the list. */ 299 for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) { 300 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0) 301 retv = -1; 302 } 303 done: 304 save_errno = errno; 305 for (entry = lw.lw_list; entry != NULL; entry = next) { 306 next = entry->lnl_next; 307 free(entry); 308 } 309 errno = save_errno; 310 311 return (retv); 312 } 313 314 /* 315 * Read data received on DLPI handle. Returns -2 if told to terminate, else 316 * returns the number of packets read. 317 */ 318 static int 319 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user) 320 { 321 struct pcap_dlpi *pd = p->priv; 322 int len; 323 u_char *bufp; 324 size_t msglen; 325 int retv; 326 327 len = p->cc; 328 if (len != 0) { 329 bufp = p->bp; 330 goto process_pkts; 331 } 332 do { 333 /* Has "pcap_breakloop()" been called? */ 334 if (p->break_loop) { 335 /* 336 * Yes - clear the flag that indicates that it has, 337 * and return -2 to indicate that we were told to 338 * break out of the loop. 339 */ 340 p->break_loop = 0; 341 return (-2); 342 } 343 344 msglen = p->bufsize; 345 bufp = p->buffer + p->offset; 346 347 retv = dlpi_recv(pd->dlpi_hd, NULL, NULL, bufp, 348 &msglen, -1, NULL); 349 if (retv != DLPI_SUCCESS) { 350 /* 351 * This is most likely a call to terminate out of the 352 * loop. So, do not return an error message, instead 353 * check if "pcap_breakloop()" has been called above. 354 */ 355 if (retv == DL_SYSERR && errno == EINTR) { 356 len = 0; 357 continue; 358 } 359 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), 360 "dlpi_recv", retv, p->errbuf); 361 return (-1); 362 } 363 len = msglen; 364 } while (len == 0); 365 366 process_pkts: 367 return (pcap_process_pkts(p, callback, user, count, bufp, len)); 368 } 369 370 static int 371 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size) 372 { 373 struct pcap_dlpi *pd = p->priv; 374 int retv; 375 376 retv = dlpi_send(pd->dlpi_hd, NULL, 0, buf, size, NULL); 377 if (retv != DLPI_SUCCESS) { 378 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), "dlpi_send", retv, 379 p->errbuf); 380 return (-1); 381 } 382 /* 383 * dlpi_send(3DLPI) does not provide a way to return the number of 384 * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was 385 * returned we are assuming 'size' bytes were sent. 386 */ 387 return (size); 388 } 389 390 /* 391 * Close dlpi handle. 392 */ 393 static void 394 pcap_cleanup_libdlpi(pcap_t *p) 395 { 396 struct pcap_dlpi *pd = p->priv; 397 398 if (pd->dlpi_hd != NULL) { 399 dlpi_close(pd->dlpi_hd); 400 pd->dlpi_hd = NULL; 401 p->fd = -1; 402 } 403 pcap_cleanup_live_common(p); 404 } 405 406 /* 407 * Write error message to buffer. 408 */ 409 static void 410 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf) 411 { 412 snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s", 413 func, linkname, dlpi_strerror(err)); 414 } 415 416 pcap_t * 417 pcap_create_interface(const char *device, char *ebuf) 418 { 419 pcap_t *p; 420 421 p = pcap_create_common(device, ebuf, sizeof (struct pcap_dlpi)); 422 if (p == NULL) 423 return (NULL); 424 425 p->activate_op = pcap_activate_libdlpi; 426 return (p); 427 } 428