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