The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 |
| 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 | * Modifications made to accommodate the new SunOS4.0 NIT facility by |
| 22 | * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989. |
| 23 | * This module now handles the STREAMS based NIT. |
| 24 | */ |
| 25 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 26 | #ifdef HAVE_CONFIG_H |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 27 | #include <config.h> |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 28 | #endif |
| 29 | |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/time.h> |
| 32 | #include <sys/timeb.h> |
| 33 | #include <sys/dir.h> |
| 34 | #include <sys/fcntlcom.h> |
| 35 | #include <sys/file.h> |
| 36 | #include <sys/ioctl.h> |
| 37 | #include <sys/socket.h> |
| 38 | #include <sys/stropts.h> |
| 39 | |
| 40 | #include <net/if.h> |
| 41 | #include <net/nit.h> |
| 42 | #include <net/nit_if.h> |
| 43 | #include <net/nit_pf.h> |
| 44 | #include <net/nit_buf.h> |
| 45 | |
| 46 | #include <netinet/in.h> |
| 47 | #include <netinet/in_systm.h> |
| 48 | #include <netinet/ip.h> |
| 49 | #include <netinet/if_ether.h> |
| 50 | #include <netinet/ip_var.h> |
| 51 | #include <netinet/udp.h> |
| 52 | #include <netinet/udp_var.h> |
| 53 | #include <netinet/tcp.h> |
| 54 | #include <netinet/tcpip.h> |
| 55 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 56 | #include <errno.h> |
| 57 | #include <stdio.h> |
| 58 | #include <string.h> |
| 59 | #include <unistd.h> |
| 60 | |
| 61 | #include "pcap-int.h" |
| 62 | |
| 63 | #ifdef HAVE_OS_PROTO_H |
| 64 | #include "os-proto.h" |
| 65 | #endif |
| 66 | |
| 67 | /* |
| 68 | * The chunk size for NIT. This is the amount of buffering |
| 69 | * done for read calls. |
| 70 | */ |
| 71 | #define CHUNKSIZE (2*1024) |
| 72 | |
| 73 | /* |
| 74 | * The total buffer space used by NIT. |
| 75 | */ |
| 76 | #define BUFSPACE (4*CHUNKSIZE) |
| 77 | |
| 78 | /* Forwards */ |
| 79 | static int nit_setflags(int, int, int, char *); |
| 80 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 81 | /* |
| 82 | * Private data for capturing on STREAMS NIT devices. |
| 83 | */ |
| 84 | struct pcap_snit { |
| 85 | struct pcap_stat stat; |
| 86 | }; |
| 87 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 88 | static int |
| 89 | pcap_stats_snit(pcap_t *p, struct pcap_stat *ps) |
| 90 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 91 | struct pcap_snit *psn = p->priv; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 92 | |
| 93 | /* |
| 94 | * "ps_recv" counts packets handed to the filter, not packets |
| 95 | * that passed the filter. As filtering is done in userland, |
| 96 | * this does not include packets dropped because we ran out |
| 97 | * of buffer space. |
| 98 | * |
| 99 | * "ps_drop" counts packets dropped inside the "/dev/nit" |
| 100 | * device because of flow control requirements or resource |
| 101 | * exhaustion; it doesn't count packets dropped by the |
| 102 | * interface driver, or packets dropped upstream. As filtering |
| 103 | * is done in userland, it counts packets regardless of whether |
| 104 | * they would've passed the filter. |
| 105 | * |
| 106 | * These statistics don't include packets not yet read from the |
| 107 | * kernel by libpcap or packets not yet read from libpcap by the |
| 108 | * application. |
| 109 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 110 | *ps = psn->stat; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 111 | return (0); |
| 112 | } |
| 113 | |
| 114 | static int |
| 115 | pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user) |
| 116 | { |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 117 | struct pcap_snit *psn = p->priv; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 118 | register int cc, n; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 119 | register u_char *bp, *cp, *ep; |
| 120 | register struct nit_bufhdr *hdrp; |
| 121 | register struct nit_iftime *ntp; |
| 122 | register struct nit_iflen *nlp; |
| 123 | register struct nit_ifdrops *ndp; |
| 124 | register int caplen; |
| 125 | |
| 126 | cc = p->cc; |
| 127 | if (cc == 0) { |
| 128 | cc = read(p->fd, (char *)p->buffer, p->bufsize); |
| 129 | if (cc < 0) { |
| 130 | if (errno == EWOULDBLOCK) |
| 131 | return (0); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 132 | pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), |
| 133 | errno, "pcap_read"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 134 | return (-1); |
| 135 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 136 | bp = (u_char *)p->buffer; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 137 | } else |
| 138 | bp = p->bp; |
| 139 | |
| 140 | /* |
| 141 | * loop through each snapshot in the chunk |
| 142 | */ |
| 143 | n = 0; |
| 144 | ep = bp + cc; |
| 145 | while (bp < ep) { |
| 146 | /* |
| 147 | * Has "pcap_breakloop()" been called? |
| 148 | * If so, return immediately - if we haven't read any |
| 149 | * packets, clear the flag and return -2 to indicate |
| 150 | * that we were told to break out of the loop, otherwise |
| 151 | * leave the flag set, so that the *next* call will break |
| 152 | * out of the loop without having read any packets, and |
| 153 | * return the number of packets we've processed so far. |
| 154 | */ |
| 155 | if (p->break_loop) { |
| 156 | if (n == 0) { |
| 157 | p->break_loop = 0; |
| 158 | return (-2); |
| 159 | } else { |
| 160 | p->bp = bp; |
| 161 | p->cc = ep - bp; |
| 162 | return (n); |
| 163 | } |
| 164 | } |
| 165 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 166 | ++psn->stat.ps_recv; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 167 | cp = bp; |
| 168 | |
| 169 | /* get past NIT buffer */ |
| 170 | hdrp = (struct nit_bufhdr *)cp; |
| 171 | cp += sizeof(*hdrp); |
| 172 | |
| 173 | /* get past NIT timer */ |
| 174 | ntp = (struct nit_iftime *)cp; |
| 175 | cp += sizeof(*ntp); |
| 176 | |
| 177 | ndp = (struct nit_ifdrops *)cp; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 178 | psn->stat.ps_drop = ndp->nh_drops; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 179 | cp += sizeof *ndp; |
| 180 | |
| 181 | /* get past packet len */ |
| 182 | nlp = (struct nit_iflen *)cp; |
| 183 | cp += sizeof(*nlp); |
| 184 | |
| 185 | /* next snapshot */ |
| 186 | bp += hdrp->nhb_totlen; |
| 187 | |
| 188 | caplen = nlp->nh_pktlen; |
| 189 | if (caplen > p->snapshot) |
| 190 | caplen = p->snapshot; |
| 191 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 192 | if (pcap_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 193 | struct pcap_pkthdr h; |
| 194 | h.ts = ntp->nh_timestamp; |
| 195 | h.len = nlp->nh_pktlen; |
| 196 | h.caplen = caplen; |
| 197 | (*callback)(user, &h, cp); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 198 | if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) { |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 199 | p->cc = ep - bp; |
| 200 | p->bp = bp; |
| 201 | return (n); |
| 202 | } |
| 203 | } |
| 204 | } |
| 205 | p->cc = 0; |
| 206 | return (n); |
| 207 | } |
| 208 | |
| 209 | static int |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 210 | pcap_inject_snit(pcap_t *p, const void *buf, int size) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 211 | { |
| 212 | struct strbuf ctl, data; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame] | 213 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 214 | /* |
| 215 | * XXX - can we just do |
| 216 | * |
| 217 | ret = write(pd->f, buf, size); |
| 218 | */ |
| 219 | ctl.len = sizeof(*sa); /* XXX - what was this? */ |
| 220 | ctl.buf = (char *)sa; |
| 221 | data.buf = buf; |
| 222 | data.len = size; |
| 223 | ret = putmsg(p->fd, &ctl, &data); |
| 224 | if (ret == -1) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 225 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 226 | errno, "send"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 227 | return (-1); |
| 228 | } |
| 229 | return (ret); |
| 230 | } |
| 231 | |
| 232 | static int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 233 | nit_setflags(pcap_t *p) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 234 | { |
| 235 | bpf_u_int32 flags; |
| 236 | struct strioctl si; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 237 | u_int zero = 0; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 238 | struct timeval timeout; |
| 239 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 240 | if (p->opt.immediate) { |
| 241 | /* |
| 242 | * Set the chunk size to zero, so that chunks get sent |
| 243 | * up immediately. |
| 244 | */ |
| 245 | si.ic_cmd = NIOCSCHUNK; |
| 246 | si.ic_len = sizeof(zero); |
| 247 | si.ic_dp = (char *)&zero; |
| 248 | if (ioctl(p->fd, I_STR, (char *)&si) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 249 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 250 | errno, "NIOCSCHUNK"); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 251 | return (-1); |
| 252 | } |
| 253 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 254 | si.ic_timout = INFTIM; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 255 | if (p->opt.timeout != 0) { |
| 256 | timeout.tv_sec = p->opt.timeout / 1000; |
| 257 | timeout.tv_usec = (p->opt.timeout * 1000) % 1000000; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 258 | si.ic_cmd = NIOCSTIME; |
| 259 | si.ic_len = sizeof(timeout); |
| 260 | si.ic_dp = (char *)&timeout; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 261 | if (ioctl(p->fd, I_STR, (char *)&si) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 262 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 263 | errno, "NIOCSTIME"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 264 | return (-1); |
| 265 | } |
| 266 | } |
| 267 | flags = NI_TIMESTAMP | NI_LEN | NI_DROPS; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 268 | if (p->opt.promisc) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 269 | flags |= NI_PROMISC; |
| 270 | si.ic_cmd = NIOCSFLAGS; |
| 271 | si.ic_len = sizeof(flags); |
| 272 | si.ic_dp = (char *)&flags; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 273 | if (ioctl(p->fd, I_STR, (char *)&si) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 274 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 275 | errno, "NIOCSFLAGS"); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 276 | return (-1); |
| 277 | } |
| 278 | return (0); |
| 279 | } |
| 280 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 281 | static int |
| 282 | pcap_activate_snit(pcap_t *p) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 283 | { |
| 284 | struct strioctl si; /* struct for ioctl() */ |
| 285 | struct ifreq ifr; /* interface request struct */ |
| 286 | int chunksize = CHUNKSIZE; |
| 287 | int fd; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 288 | static const char dev[] = "/dev/nit"; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 289 | int err; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 290 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 291 | if (p->opt.rfmon) { |
| 292 | /* |
| 293 | * No monitor mode on SunOS 4.x (no Wi-Fi devices on |
| 294 | * hardware supported by SunOS 4.x). |
| 295 | */ |
| 296 | return (PCAP_ERROR_RFMON_NOTSUP); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 297 | } |
| 298 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 299 | /* |
| 300 | * Turn a negative snapshot value (invalid), a snapshot value of |
| 301 | * 0 (unspecified), or a value bigger than the normal maximum |
| 302 | * value, into the maximum allowed value. |
| 303 | * |
| 304 | * If some application really *needs* a bigger snapshot |
| 305 | * length, we should just increase MAXIMUM_SNAPLEN. |
| 306 | */ |
| 307 | if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN) |
| 308 | p->snapshot = MAXIMUM_SNAPLEN; |
| 309 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 310 | if (p->snapshot < 96) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 311 | /* |
| 312 | * NIT requires a snapshot length of at least 96. |
| 313 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 314 | p->snapshot = 96; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 315 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 316 | /* |
| 317 | * Initially try a read/write open (to allow the inject |
| 318 | * method to work). If that fails due to permission |
| 319 | * issues, fall back to read-only. This allows a |
| 320 | * non-root user to be granted specific access to pcap |
| 321 | * capabilities via file permissions. |
| 322 | * |
| 323 | * XXX - we should have an API that has a flag that |
| 324 | * controls whether to open read-only or read-write, |
| 325 | * so that denial of permission to send (or inability |
| 326 | * to send, if sending packets isn't supported on |
| 327 | * the device in question) can be indicated at open |
| 328 | * time. |
| 329 | */ |
| 330 | p->fd = fd = open(dev, O_RDWR); |
| 331 | if (fd < 0 && errno == EACCES) |
| 332 | p->fd = fd = open(dev, O_RDONLY); |
| 333 | if (fd < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 334 | if (errno == EACCES) |
| 335 | err = PCAP_ERROR_PERM_DENIED; |
| 336 | else |
| 337 | err = PCAP_ERROR; |
| 338 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 339 | errno, "%s", dev); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 340 | goto bad; |
| 341 | } |
| 342 | |
| 343 | /* arrange to get discrete messages from the STREAM and use NIT_BUF */ |
| 344 | if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 345 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 346 | errno, "I_SRDOPT"); |
| 347 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 348 | goto bad; |
| 349 | } |
| 350 | if (ioctl(fd, I_PUSH, "nbuf") < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 351 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 352 | errno, "push nbuf"); |
| 353 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 354 | goto bad; |
| 355 | } |
| 356 | /* set the chunksize */ |
| 357 | si.ic_cmd = NIOCSCHUNK; |
| 358 | si.ic_timout = INFTIM; |
| 359 | si.ic_len = sizeof(chunksize); |
| 360 | si.ic_dp = (char *)&chunksize; |
| 361 | if (ioctl(fd, I_STR, (char *)&si) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 362 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 363 | errno, "NIOCSCHUNK"); |
| 364 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 365 | goto bad; |
| 366 | } |
| 367 | |
| 368 | /* request the interface */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 369 | strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name)); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 370 | ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0'; |
| 371 | si.ic_cmd = NIOCBIND; |
| 372 | si.ic_len = sizeof(ifr); |
| 373 | si.ic_dp = (char *)𝔦 |
| 374 | if (ioctl(fd, I_STR, (char *)&si) < 0) { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 375 | /* |
| 376 | * XXX - is there an error that means "no such device"? |
| 377 | * Is there one that means "that device doesn't support |
| 378 | * STREAMS NIT"? |
| 379 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 380 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 381 | errno, "NIOCBIND: %s", ifr.ifr_name); |
| 382 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 383 | goto bad; |
| 384 | } |
| 385 | |
| 386 | /* set the snapshot length */ |
| 387 | si.ic_cmd = NIOCSSNAP; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 388 | si.ic_len = sizeof(p->snapshot); |
| 389 | si.ic_dp = (char *)&p->snapshot; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 390 | if (ioctl(fd, I_STR, (char *)&si) < 0) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 391 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 392 | errno, "NIOCSSNAP"); |
| 393 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 394 | goto bad; |
| 395 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 396 | if (nit_setflags(p) < 0) { |
| 397 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 398 | goto bad; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 399 | } |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 400 | |
| 401 | (void)ioctl(fd, I_FLUSH, (char *)FLUSHR); |
| 402 | /* |
| 403 | * NIT supports only ethernets. |
| 404 | */ |
| 405 | p->linktype = DLT_EN10MB; |
| 406 | |
| 407 | p->bufsize = BUFSPACE; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 408 | p->buffer = malloc(p->bufsize); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 409 | if (p->buffer == NULL) { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 410 | pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, |
| 411 | errno, "malloc"); |
| 412 | err = PCAP_ERROR; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 413 | goto bad; |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * "p->fd" is an FD for a STREAMS device, so "select()" and |
| 418 | * "poll()" should work on it. |
| 419 | */ |
| 420 | p->selectable_fd = p->fd; |
| 421 | |
| 422 | /* |
| 423 | * This is (presumably) a real Ethernet capture; give it a |
| 424 | * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so |
| 425 | * that an application can let you choose it, in case you're |
| 426 | * capturing DOCSIS traffic that a Cisco Cable Modem |
| 427 | * Termination System is putting out onto an Ethernet (it |
| 428 | * doesn't put an Ethernet header onto the wire, it puts raw |
| 429 | * DOCSIS frames out on the wire inside the low-level |
| 430 | * Ethernet framing). |
| 431 | */ |
| 432 | p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2); |
| 433 | /* |
| 434 | * If that fails, just leave the list empty. |
| 435 | */ |
| 436 | if (p->dlt_list != NULL) { |
| 437 | p->dlt_list[0] = DLT_EN10MB; |
| 438 | p->dlt_list[1] = DLT_DOCSIS; |
| 439 | p->dlt_count = 2; |
| 440 | } |
| 441 | |
| 442 | p->read_op = pcap_read_snit; |
| 443 | p->inject_op = pcap_inject_snit; |
| 444 | p->setfilter_op = install_bpf_program; /* no kernel filtering */ |
| 445 | p->setdirection_op = NULL; /* Not implemented. */ |
| 446 | p->set_datalink_op = NULL; /* can't change data link type */ |
| 447 | p->getnonblock_op = pcap_getnonblock_fd; |
| 448 | p->setnonblock_op = pcap_setnonblock_fd; |
| 449 | p->stats_op = pcap_stats_snit; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 450 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 451 | return (0); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 452 | bad: |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 453 | pcap_cleanup_live_common(p); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 454 | return (err); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | pcap_t * |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 458 | pcap_create_interface(const char *device _U_, char *ebuf) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 459 | { |
| 460 | pcap_t *p; |
| 461 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 462 | p = PCAP_CREATE_COMMON(ebuf, struct pcap_snit); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 463 | if (p == NULL) |
| 464 | return (NULL); |
| 465 | |
| 466 | p->activate_op = pcap_activate_snit; |
| 467 | return (p); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 468 | } |
| 469 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 470 | /* |
| 471 | * XXX - there's probably a NIOCBIND error that means "that device |
| 472 | * doesn't support NIT"; if so, we should try an NIOCBIND and use that. |
| 473 | */ |
| 474 | static int |
| 475 | can_be_bound(const char *name _U_) |
| 476 | { |
| 477 | return (1); |
| 478 | } |
| 479 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 480 | static int |
| 481 | get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 482 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 483 | /* |
| 484 | * Nothing we can do. |
| 485 | * XXX - is there a way to find out whether an adapter has |
| 486 | * something plugged into it? |
| 487 | */ |
| 488 | return (0); |
| 489 | } |
| 490 | |
| 491 | int |
| 492 | pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) |
| 493 | { |
| 494 | return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound, |
| 495 | get_if_flags)); |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Libpcap version string. |
| 500 | */ |
| 501 | const char * |
| 502 | pcap_lib_version(void) |
| 503 | { |
| 504 | return (PCAP_VERSION_STRING); |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 505 | } |