granicus.if.org Git - strace/blob - sock.c

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   3  * Copyright (c) 1996-2017 The strace developers.
   4  * 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. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "defs.h"
  30 #include "print_fields.h"
  31
  32 #include <sys/socket.h>
  33 #if defined ALPHA || defined SH || defined SH64
  34 # include <linux/ioctl.h>
  35 #endif
  36 #include <linux/sockios.h>
  37 #include <arpa/inet.h>
  38 #include <net/if.h>
  39
  40 #include DEF_MPERS_TYPE(struct_ifconf)
  41 #include DEF_MPERS_TYPE(struct_ifreq)
  42
  43 typedef struct ifconf struct_ifconf;
  44 typedef struct ifreq struct_ifreq;
  45
  46 #include MPERS_DEFS
  47
  48 #include "xlat/iffflags.h"
  49
  50 #define XLAT_MACROS_ONLY
  51 # include "xlat/arp_hardware_types.h"
  52 #undef XLAT_MACROS_ONLY
  53
  54 static void
  55 print_ifname(const char *ifname)
  56 {
  57         print_quoted_string(ifname, IFNAMSIZ + 1, QUOTE_0_TERMINATED);
  58 }
  59
  60 static void
  61 print_ifreq(struct tcb *const tcp, const unsigned int code,
  62             const kernel_ulong_t arg, const struct_ifreq *const ifr)
  63 {
  64         switch (code) {
  65         case SIOCSIFADDR:
  66         case SIOCGIFADDR:
  67                 PRINT_FIELD_SOCKADDR("", *ifr, ifr_addr);
  68                 break;
  69         case SIOCSIFDSTADDR:
  70         case SIOCGIFDSTADDR:
  71                 PRINT_FIELD_SOCKADDR("", *ifr, ifr_dstaddr);
  72                 break;
  73         case SIOCSIFBRDADDR:
  74         case SIOCGIFBRDADDR:
  75                 PRINT_FIELD_SOCKADDR("", *ifr, ifr_broadaddr);
  76                 break;
  77         case SIOCSIFNETMASK:
  78         case SIOCGIFNETMASK:
  79                 PRINT_FIELD_SOCKADDR("", *ifr, ifr_netmask);
  80                 break;
  81         case SIOCSIFHWADDR:
  82         case SIOCGIFHWADDR: {
  83                 static uint8_t hwaddr_sizes[] = {
  84                         [0 ... ARPHRD_IEEE802_TR] = 255,
  85
  86                         [ARPHRD_NETROM]     =  7 /* AX25_ADDR_LEN */,
  87                         [ARPHRD_ETHER]      =  6 /* ETH_ALEN */,
  88                         /* ARPHRD_EETHER - no actual devices in Linux */
  89                         [ARPHRD_AX25]       =  7 /* AX25_ADDR_LEN */,
  90                         /* ARPHRD_PRONET - no actual devices in Linux */
  91                         /* ARPHRD_CHAOS - no actual devices in Linux */
  92                         [ARPHRD_IEEE802]    =  6 /* FC_ALEN */,
  93                         [ARPHRD_ARCNET]     =  1 /* ARCNET_ALEN */,
  94                         /* ARPHRD_APPLETLK - no actual devices in Linux */
  95                         [ARPHRD_DLCI]       = sizeof(short),
  96                         /* ARPHRD_ATM - no explicit setting */
  97                         /* ARPHRD_METRICOM - no actual devices in Linux */
  98                         [ARPHRD_IEEE1394]   = 16 /* FWNET_ALEN */,
  99                         [ARPHRD_EUI64]      =  8 /* EUI64_ADDR_LEN */,
 100                         [ARPHRD_INFINIBAND] = 20 /* INFINIBAND_ALEN */,
 101                         [ARPHRD_SLIP]       =  0,
 102                         /* ARPHRD_CSLIP - no actual devices in Linux */
 103                         /* ARPHRD_SLIP6 - no actual devices in Linux */
 104                         /* ARPHRD_CSLIP6 - no actual devices in Linux */
 105                         /* ARPHRD_RSRVD - no actual devices in Linux */
 106                         /* ARPHRD_ADAPT - no actual devices in Linux */
 107                         [ARPHRD_ROSE]       =  5 /* ROSE_ADDR_LEN */,
 108                         [ARPHRD_X25]        =  0,
 109                         /* ARPHRD_HWX25 - no actual devices in Linux */
 110                         [ARPHRD_CAN]        =  0,
 111                         [ARPHRD_PPP]        =  0,
 112                         /* ARPHRD_CISCO - no actual devices in Linux */
 113                         /* ARPHRD_LAPB - no actual devices in Linux */
 114                         /* ARPHRD_DDCMP - no actual devices in Linux */
 115                         [ARPHRD_RAWHDLC]    =  0,
 116                         [ARPHRD_RAWIP]      =  0,
 117                         [ARPHRD_TUNNEL]     =  4 /* IPIP */,
 118                         [ARPHRD_TUNNEL6]    = 16 /* sizeof(struct in6_addr) */,
 119                         /* ARPHRD_FRAD - no actual devices in Linux */
 120                         /* ARPHRD_SKIP - no actual devices in Linux */
 121                         [ARPHRD_LOOPBACK]   =  6 /* ETH_ALEN */,
 122                         [ARPHRD_LOCALTLK]   =  1 /* LTALK_ALEN */,
 123                         [ARPHRD_FDDI]       =  6 /* FDDI_K_ALEN */,
 124                         /* ARPHRD_BIF - no actual devices in Linux */
 125                         [ARPHRD_SIT]        =  4,
 126                         [ARPHRD_IPDDP]      =  0,
 127                         [ARPHRD_IPGRE]      =  4,
 128                         [ARPHRD_PIMREG]     =  0,
 129                         [ARPHRD_HIPPI]      =  6 /* HIPPI_ALEN */,
 130                         /* ARPHRD_ASH - no actual devices in Linux */
 131                         /* ARPHRD_ECONET - no actual devices in Linux */
 132                         [ARPHRD_IRDA]       =  4 /* LAP_ALEN */,
 133                         /* ARPHRD_FCPP - no actual devices in Linux */
 134                         /* ARPHRD_FCAL - no actual devices in Linux */
 135                         /* ARPHRD_FCPL - no actual devices in Linux */
 136                         /* ARPHRD_FCFABRIC - no actual devices in Linux */
 137                         /* ARPHRD_IEEE802_TR - no actual devices in Linux */
 138                         [ARPHRD_IEEE80211]  =  6 /* ETH_ALEN */,
 139                         [ARPHRD_IEEE80211_PRISM] = 6 /* ETH_ALEN */,
 140                         [ARPHRD_IEEE80211_RADIOTAP] = 6 /* ETH_ALEN */,
 141                         [ARPHRD_IEEE802154]
 142                                 = 8 /* IEEE802154_EXTENDED_ADDR_LEN */,
 143                         [ARPHRD_IEEE802154_MONITOR]
 144                                 = 8 /* IEEE802154_EXTENDED_ADDR_LEN */,
 145                         [ARPHRD_PHONET]     =  1,
 146                         [ARPHRD_PHONET_PIPE] = 1,
 147                         [ARPHRD_CAIF]       =  0,
 148                         [ARPHRD_IP6GRE]     = 16 /* sizeof(struct in6_addr) */,
 149                         [ARPHRD_NETLINK]    =  0,
 150                         [ARPHRD_6LOWPAN]    =  8 /* EUI64_ADDR_LEN */
 151                                 /* ^ or ETH_ALEN, depending on lltype */,
 152                         [ARPHRD_VSOCKMON]   =  0,
 153                 };
 154
 155                 uint16_t proto = ifr->ifr_hwaddr.sa_family;
 156                 uint8_t sz = (proto < ARRAY_SIZE(hwaddr_sizes))
 157                                 ? hwaddr_sizes[proto] : 255;
 158
 159                 PRINT_FIELD_XVAL_SORTED_SIZED("ifr_hwaddr={", ifr->ifr_hwaddr,
 160                                               sa_family, arp_hardware_types,
 161                                               arp_hardware_types_size,
 162                                               "ARPHRD_???");
 163                 PRINT_FIELD_MAC_SZ(", ", ifr->ifr_hwaddr, sa_data,
 164                                    MIN(sizeof(ifr->ifr_hwaddr.sa_data), sz));
 165                 tprints("}");
 166                 break;
 167         }
 168         case SIOCSIFFLAGS:
 169         case SIOCGIFFLAGS:
 170                 tprints("ifr_flags=");
 171                 printflags(iffflags, (unsigned short) ifr->ifr_flags, "IFF_???");
 172                 break;
 173         case SIOCSIFMETRIC:
 174         case SIOCGIFMETRIC:
 175                 tprintf("ifr_metric=%d", ifr->ifr_metric);
 176                 break;
 177         case SIOCSIFMTU:
 178         case SIOCGIFMTU:
 179                 tprintf("ifr_mtu=%d", ifr->ifr_mtu);
 180                 break;
 181         case SIOCSIFSLAVE:
 182         case SIOCGIFSLAVE:
 183                 tprints("ifr_slave=");
 184                 print_ifname(ifr->ifr_slave);
 185                 break;
 186         case SIOCSIFTXQLEN:
 187         case SIOCGIFTXQLEN:
 188                 tprintf("ifr_qlen=%d", ifr->ifr_qlen);
 189                 break;
 190         case SIOCSIFMAP:
 191         case SIOCGIFMAP:
 192                 tprintf("ifr_map={mem_start=%#" PRI_klx ", "
 193                         "mem_end=%#" PRI_klx ", base_addr=%#x, "
 194                         "irq=%u, dma=%u, port=%u}",
 195                         (kernel_ulong_t) ifr->ifr_map.mem_start,
 196                         (kernel_ulong_t) ifr->ifr_map.mem_end,
 197                         (unsigned) ifr->ifr_map.base_addr,
 198                         (unsigned) ifr->ifr_map.irq,
 199                         (unsigned) ifr->ifr_map.dma,
 200                         (unsigned) ifr->ifr_map.port);
 201                 break;
 202         }
 203 }
 204
 205 static unsigned int
 206 print_ifc_len(int len)
 207 {
 208         const unsigned int n = (unsigned int) len / sizeof(struct_ifreq);
 209
 210         if (len < 0 || n * sizeof(struct_ifreq) != (unsigned int) len)
 211                 tprintf("%d", len);
 212         else
 213                 tprintf("%u * sizeof(struct ifreq)", n);
 214
 215         return n;
 216 }
 217
 218 static bool
 219 print_ifconf_ifreq(struct tcb *tcp, void *elem_buf, size_t elem_size,
 220                    void *dummy)
 221 {
 222         struct_ifreq *ifr = elem_buf;
 223
 224         tprints("{ifr_name=");
 225         print_ifname(ifr->ifr_name);
 226         PRINT_FIELD_SOCKADDR(", ", *ifr, ifr_addr);
 227         tprints("}");
 228
 229         return true;
 230 }
 231
 232 /*
 233  * There are two different modes of operation:
 234  *
 235  * - Get buffer size.  In this case, the callee sets ifc_buf to NULL,
 236  *   and the kernel returns the buffer size in ifc_len.
 237  * - Get actual data.  In this case, the callee specifies the buffer address
 238  *   in ifc_buf and its size in ifc_len.  The kernel fills the buffer with
 239  *   the data, and its amount is returned in ifc_len.
 240  *
 241  * Note that, technically, the whole struct ifconf is overwritten,
 242  * so ifc_buf could be different on exit, but current ioctl handler
 243  * implementation does not touch it.
 244  */
 245 static int
 246 decode_ifconf(struct tcb *const tcp, const kernel_ulong_t addr)
 247 {
 248         struct_ifconf *entering_ifc = NULL;
 249         struct_ifconf *ifc =
 250                 entering(tcp) ? malloc(sizeof(*ifc)) : alloca(sizeof(*ifc));
 251
 252         if (exiting(tcp)) {
 253                 entering_ifc = get_tcb_priv_data(tcp);
 254
 255                 if (!entering_ifc) {
 256                         error_func_msg("where is my ifconf?");
 257                         return 0;
 258                 }
 259         }
 260
 261         if (!ifc || umove(tcp, addr, ifc) < 0) {
 262                 if (entering(tcp)) {
 263                         free(ifc);
 264
 265                         tprints(", ");
 266                         printaddr(addr);
 267                 } else {
 268                         /*
 269                          * We failed to fetch the structure on exiting syscall,
 270                          * print whatever was fetched on entering syscall.
 271                          */
 272                         if (!entering_ifc->ifc_buf)
 273                                 print_ifc_len(entering_ifc->ifc_len);
 274
 275                         tprints(", ifc_buf=");
 276                         printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 277
 278                         tprints("}");
 279                 }
 280
 281                 return RVAL_IOCTL_DECODED;
 282         }
 283
 284         if (entering(tcp)) {
 285                 tprints(", {ifc_len=");
 286                 if (ifc->ifc_buf)
 287                         print_ifc_len(ifc->ifc_len);
 288
 289                 set_tcb_priv_data(tcp, ifc, free);
 290
 291                 return 0;
 292         }
 293
 294         /* exiting */
 295
 296         if (entering_ifc->ifc_buf && (entering_ifc->ifc_len != ifc->ifc_len))
 297                 tprints(" => ");
 298         if (!entering_ifc->ifc_buf || (entering_ifc->ifc_len != ifc->ifc_len))
 299                 print_ifc_len(ifc->ifc_len);
 300
 301         tprints(", ifc_buf=");
 302
 303         if (!entering_ifc->ifc_buf || syserror(tcp)) {
 304                 printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 305                 if (entering_ifc->ifc_buf != ifc->ifc_buf) {
 306                         tprints(" => ");
 307                         printaddr(ptr_to_kulong(ifc->ifc_buf));
 308                 }
 309         } else {
 310                 struct_ifreq ifr;
 311
 312                 print_array(tcp, ptr_to_kulong(ifc->ifc_buf),
 313                             ifc->ifc_len / sizeof(struct_ifreq),
 314                             &ifr, sizeof(ifr),
 315                             tfetch_mem, print_ifconf_ifreq, NULL);
 316         }
 317
 318         tprints("}");
 319
 320         return RVAL_IOCTL_DECODED;
 321 }
 322
 323 MPERS_PRINTER_DECL(int, sock_ioctl,
 324                    struct tcb *tcp, const unsigned int code,
 325                    const kernel_ulong_t arg)
 326 {
 327         struct_ifreq ifr;
 328
 329         switch (code) {
 330         case SIOCGIFCONF:
 331                 return decode_ifconf(tcp, arg);
 332
 333 #ifdef SIOCBRADDBR
 334         case SIOCBRADDBR:
 335         case SIOCBRDELBR:
 336                 tprints(", ");
 337                 printstr(tcp, arg);
 338                 break;
 339 #endif
 340
 341 #ifdef FIOSETOWN
 342         case FIOSETOWN:
 343 #endif
 344 #ifdef SIOCSPGRP
 345         case SIOCSPGRP:
 346 #endif
 347                 tprints(", ");
 348                 printnum_int(tcp, arg, "%d");
 349                 break;
 350
 351 #ifdef FIOGETOWN
 352         case FIOGETOWN:
 353 #endif
 354 #ifdef SIOCGPGRP
 355         case SIOCGPGRP:
 356 #endif
 357 #ifdef SIOCATMARK
 358         case SIOCATMARK:
 359 #endif
 360                 if (entering(tcp))
 361                         return 0;
 362                 tprints(", ");
 363                 printnum_int(tcp, arg, "%d");
 364                 break;
 365
 366 #ifdef SIOCBRADDIF
 367         case SIOCBRADDIF:
 368 #endif
 369 #ifdef SIOCBRDELIF
 370         case SIOCBRDELIF:
 371 #endif
 372                 /* no arguments */
 373                 break;
 374
 375         case SIOCSIFNAME:
 376         case SIOCSIFADDR:
 377         case SIOCSIFDSTADDR:
 378         case SIOCSIFBRDADDR:
 379         case SIOCSIFNETMASK:
 380         case SIOCSIFFLAGS:
 381         case SIOCSIFMETRIC:
 382         case SIOCSIFMTU:
 383         case SIOCSIFSLAVE:
 384         case SIOCSIFHWADDR:
 385         case SIOCSIFTXQLEN:
 386         case SIOCSIFMAP:
 387                 tprints(", ");
 388                 if (umove_or_printaddr(tcp, arg, &ifr))
 389                         break;
 390
 391                 tprints("{ifr_name=");
 392                 print_ifname(ifr.ifr_name);
 393                 tprints(", ");
 394                 if (code == SIOCSIFNAME) {
 395                         tprints("ifr_newname=");
 396                         print_ifname(ifr.ifr_newname);
 397                 } else {
 398                         print_ifreq(tcp, code, arg, &ifr);
 399                 }
 400                 tprints("}");
 401                 break;
 402
 403         case SIOCGIFNAME:
 404         case SIOCGIFINDEX:
 405         case SIOCGIFADDR:
 406         case SIOCGIFDSTADDR:
 407         case SIOCGIFBRDADDR:
 408         case SIOCGIFNETMASK:
 409         case SIOCGIFFLAGS:
 410         case SIOCGIFMETRIC:
 411         case SIOCGIFMTU:
 412         case SIOCGIFSLAVE:
 413         case SIOCGIFHWADDR:
 414         case SIOCGIFTXQLEN:
 415         case SIOCGIFMAP:
 416                 if (entering(tcp)) {
 417                         tprints(", ");
 418                         if (umove_or_printaddr(tcp, arg, &ifr))
 419                                 break;
 420
 421                         if (SIOCGIFNAME == code) {
 422                                 tprintf("{ifr_index=%d", ifr.ifr_ifindex);
 423                         } else {
 424                                 tprints("{ifr_name=");
 425                                 print_ifname(ifr.ifr_name);
 426                         }
 427                         return 0;
 428                 } else {
 429                         if (syserror(tcp)) {
 430                                 tprints("}");
 431                                 break;
 432                         }
 433
 434                         tprints(", ");
 435                         if (umove(tcp, arg, &ifr) < 0) {
 436                                 tprints("???}");
 437                                 break;
 438                         }
 439
 440                         if (SIOCGIFNAME == code) {
 441                                 tprints("ifr_name=");
 442                                 print_ifname(ifr.ifr_name);
 443                         } else {
 444                                 print_ifreq(tcp, code, arg, &ifr);
 445                         }
 446                         tprints("}");
 447                         break;
 448                 }
 449
 450         default:
 451                 return RVAL_DECODED;
 452         }
 453
 454         return RVAL_IOCTL_DECODED;
 455 }