1 /* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997 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 * This code contributed by Sagun Shakya (sagun.shakya (at) sun.com) 22 */ 23 /* 24 * Packet capture routines for DLPI using libdlpi under SunOS 5.11. 25 */ 26 27 #ifndef lint 28 static const char rcsid[] _U_ = 29 "@(#) $Header: /tcpdump/master/libpcap/pcap-libdlpi.c,v 1.6 2008-04-14 20:40:58 guy Exp $ (LBL)"; 30 #endif 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 retv; 105 dlpi_handle_t dh; 106 dlpi_info_t dlinfo; 107 int err = PCAP_ERROR; 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 err = PCAP_ERROR_NO_SUCH_DEVICE; 118 else if (retv == DL_SYSERR && 119 (errno == EPERM || errno == EACCES)) 120 err = PCAP_ERROR_PERM_DENIED; 121 pcap_libdlpi_err(p->opt.source, "dlpi_open", retv, 122 p->errbuf); 123 return (err); 124 } 125 pd->dlpi_hd = dh; 126 127 if (p->opt.rfmon) { 128 /* 129 * This device exists, but we don't support monitor mode 130 * any platforms that support DLPI. 131 */ 132 err = PCAP_ERROR_RFMON_NOTSUP; 133 goto bad; 134 } 135 136 /* Bind with DLPI_ANY_SAP. */ 137 if ((retv = dlpi_bind(pd->dlpi_hd, DLPI_ANY_SAP, 0)) != DLPI_SUCCESS) { 138 pcap_libdlpi_err(p->opt.source, "dlpi_bind", retv, p->errbuf); 139 goto bad; 140 } 141 142 /* Enable promiscuous mode. */ 143 if (p->opt.promisc) { 144 err = dlpromiscon(p, DL_PROMISC_PHYS); 145 if (err < 0) { 146 /* 147 * "You don't have permission to capture on 148 * this device" and "you don't have permission 149 * to capture in promiscuous mode on this 150 * device" are different; let the user know, 151 * so if they can't get permission to 152 * capture in promiscuous mode, they can at 153 * least try to capture in non-promiscuous 154 * mode. 155 * 156 * XXX - you might have to capture in 157 * promiscuous mode to see outgoing packets. 158 */ 159 if (err == PCAP_ERROR_PERM_DENIED) 160 err = PCAP_ERROR_PROMISC_PERM_DENIED; 161 goto bad; 162 } 163 } else { 164 /* Try to enable multicast. */ 165 err = dlpromiscon(p, DL_PROMISC_MULTI); 166 if (err < 0) 167 goto bad; 168 } 169 170 /* Try to enable SAP promiscuity. */ 171 err = dlpromiscon(p, DL_PROMISC_SAP); 172 if (err < 0) { 173 /* 174 * Not fatal, since the DL_PROMISC_PHYS mode worked. 175 * Report it as a warning, however. 176 */ 177 if (p->opt.promisc) 178 err = PCAP_WARNING; 179 else 180 goto bad; 181 } 182 183 /* Determine link type. */ 184 if ((retv = dlpi_info(pd->dlpi_hd, &dlinfo, 0)) != DLPI_SUCCESS) { 185 pcap_libdlpi_err(p->opt.source, "dlpi_info", retv, p->errbuf); 186 goto bad; 187 } 188 189 if (pcap_process_mactype(p, dlinfo.di_mactype) != 0) 190 goto bad; 191 192 p->fd = dlpi_fd(pd->dlpi_hd); 193 194 /* Push and configure bufmod. */ 195 if (pcap_conf_bufmod(p, p->snapshot) != 0) 196 goto bad; 197 198 /* 199 * Flush the read side. 200 */ 201 if (ioctl(p->fd, I_FLUSH, FLUSHR) != 0) { 202 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "FLUSHR: %s", 203 pcap_strerror(errno)); 204 goto bad; 205 } 206 207 /* Allocate data buffer. */ 208 if (pcap_alloc_databuf(p) != 0) 209 goto bad; 210 211 /* 212 * "p->fd" is a FD for a STREAMS device, so "select()" and 213 * "poll()" should work on it. 214 */ 215 p->selectable_fd = p->fd; 216 217 p->read_op = pcap_read_libdlpi; 218 p->inject_op = pcap_inject_libdlpi; 219 p->setfilter_op = install_bpf_program; /* No kernel filtering */ 220 p->setdirection_op = NULL; /* Not implemented */ 221 p->set_datalink_op = NULL; /* Can't change data link type */ 222 p->getnonblock_op = pcap_getnonblock_fd; 223 p->setnonblock_op = pcap_setnonblock_fd; 224 p->stats_op = pcap_stats_dlpi; 225 p->cleanup_op = pcap_cleanup_libdlpi; 226 227 return (0); 228 bad: 229 pcap_cleanup_libdlpi(p); 230 return (err); 231 } 232 233 #define STRINGIFY(n) #n 234 235 static int 236 dlpromiscon(pcap_t *p, bpf_u_int32 level) 237 { 238 struct pcap_dlpi *pd = p->priv; 239 int retv; 240 int err; 241 242 retv = dlpi_promiscon(pd->dlpi_hd, level); 243 if (retv != DLPI_SUCCESS) { 244 if (retv == DL_SYSERR && 245 (errno == EPERM || errno == EACCES)) 246 err = PCAP_ERROR_PERM_DENIED; 247 else 248 err = PCAP_ERROR; 249 pcap_libdlpi_err(p->opt.source, "dlpi_promiscon" STRINGIFY(level), 250 retv, p->errbuf); 251 return (err); 252 } 253 return (0); 254 } 255 256 /* 257 * In Solaris, the "standard" mechanism" i.e SIOCGLIFCONF will only find 258 * network links that are plumbed and are up. dlpi_walk(3DLPI) will find 259 * additional network links present in the system. 260 */ 261 int 262 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) 263 { 264 int retv = 0; 265 266 linknamelist_t *entry, *next; 267 linkwalk_t lw = {NULL, 0}; 268 int save_errno; 269 270 /* dlpi_walk() for loopback will be added here. */ 271 272 dlpi_walk(list_interfaces, &lw, 0); 273 274 if (lw.lw_err != 0) { 275 snprintf(errbuf, PCAP_ERRBUF_SIZE, 276 "dlpi_walk: %s", pcap_strerror(lw.lw_err)); 277 retv = -1; 278 goto done; 279 } 280 281 /* Add linkname if it does not exist on the list. */ 282 for (entry = lw.lw_list; entry != NULL; entry = entry->lnl_next) { 283 if (pcap_add_if(alldevsp, entry->linkname, 0, NULL, errbuf) < 0) 284 retv = -1; 285 } 286 done: 287 save_errno = errno; 288 for (entry = lw.lw_list; entry != NULL; entry = next) { 289 next = entry->lnl_next; 290 free(entry); 291 } 292 errno = save_errno; 293 294 return (retv); 295 } 296 297 /* 298 * Read data received on DLPI handle. Returns -2 if told to terminate, else 299 * returns the number of packets read. 300 */ 301 static int 302 pcap_read_libdlpi(pcap_t *p, int count, pcap_handler callback, u_char *user) 303 { 304 struct pcap_dlpi *pd = p->priv; 305 int len; 306 u_char *bufp; 307 size_t msglen; 308 int retv; 309 310 len = p->cc; 311 if (len != 0) { 312 bufp = p->bp; 313 goto process_pkts; 314 } 315 do { 316 /* Has "pcap_breakloop()" been called? */ 317 if (p->break_loop) { 318 /* 319 * Yes - clear the flag that indicates that it has, 320 * and return -2 to indicate that we were told to 321 * break out of the loop. 322 */ 323 p->break_loop = 0; 324 return (-2); 325 } 326 327 msglen = p->bufsize; 328 bufp = p->buffer + p->offset; 329 330 retv = dlpi_recv(pd->dlpi_hd, NULL, NULL, bufp, 331 &msglen, -1, NULL); 332 if (retv != DLPI_SUCCESS) { 333 /* 334 * This is most likely a call to terminate out of the 335 * loop. So, do not return an error message, instead 336 * check if "pcap_breakloop()" has been called above. 337 */ 338 if (retv == DL_SYSERR && errno == EINTR) { 339 len = 0; 340 continue; 341 } 342 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), 343 "dlpi_recv", retv, p->errbuf); 344 return (-1); 345 } 346 len = msglen; 347 } while (len == 0); 348 349 process_pkts: 350 return (pcap_process_pkts(p, callback, user, count, bufp, len)); 351 } 352 353 static int 354 pcap_inject_libdlpi(pcap_t *p, const void *buf, size_t size) 355 { 356 struct pcap_dlpi *pd = p->priv; 357 int retv; 358 359 retv = dlpi_send(pd->dlpi_hd, NULL, 0, buf, size, NULL); 360 if (retv != DLPI_SUCCESS) { 361 pcap_libdlpi_err(dlpi_linkname(pd->dlpi_hd), "dlpi_send", retv, 362 p->errbuf); 363 return (-1); 364 } 365 /* 366 * dlpi_send(3DLPI) does not provide a way to return the number of 367 * bytes sent on the wire. Based on the fact that DLPI_SUCCESS was 368 * returned we are assuming 'size' bytes were sent. 369 */ 370 return (size); 371 } 372 373 /* 374 * Close dlpi handle. 375 */ 376 static void 377 pcap_cleanup_libdlpi(pcap_t *p) 378 { 379 struct pcap_dlpi *pd = p->priv; 380 381 if (pd->dlpi_hd != NULL) { 382 dlpi_close(pd->dlpi_hd); 383 pd->dlpi_hd = NULL; 384 p->fd = -1; 385 } 386 pcap_cleanup_live_common(p); 387 } 388 389 /* 390 * Write error message to buffer. 391 */ 392 static void 393 pcap_libdlpi_err(const char *linkname, const char *func, int err, char *errbuf) 394 { 395 snprintf(errbuf, PCAP_ERRBUF_SIZE, "libpcap: %s failed on %s: %s", 396 func, linkname, dlpi_strerror(err)); 397 } 398 399 pcap_t * 400 pcap_create_interface(const char *device, char *ebuf) 401 { 402 pcap_t *p; 403 404 p = pcap_create_common(device, ebuf, sizeof (struct pcap_dlpi)); 405 if (p == NULL) 406 return (NULL); 407 408 p->activate_op = pcap_activate_libdlpi; 409 return (p); 410 } 411
