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
  31 #include <sys/socket.h>
  32 #if defined ALPHA || defined SH || defined SH64
  33 # include <linux/ioctl.h>
  34 #endif
  35 #include <linux/sockios.h>
  36 #include <arpa/inet.h>
  37 #include <net/if.h>
  38
  39 #include DEF_MPERS_TYPE(struct_ifconf)
  40 #include DEF_MPERS_TYPE(struct_ifreq)
  41
  42 typedef struct ifconf struct_ifconf;
  43 typedef struct ifreq struct_ifreq;
  44
  45 #include MPERS_DEFS
  46
  47 #include "xlat/iffflags.h"
  48
  49 #define PRINT_IFREQ_ADDR(tcp, ifr, sockaddr)                                    \
  50         do {                                                                    \
  51                 tprints(#sockaddr "=");                                         \
  52                 print_sockaddr(tcp, &((ifr)->sockaddr),                         \
  53                                sizeof((ifr)->sockaddr));                        \
  54         } while (0)
  55
  56 static void
  57 print_ifname(const char *ifname)
  58 {
  59         print_quoted_string(ifname, IFNAMSIZ + 1, QUOTE_0_TERMINATED);
  60 }
  61
  62 static void
  63 print_ifreq(struct tcb *const tcp, const unsigned int code,
  64             const kernel_ulong_t arg, const struct_ifreq *const ifr)
  65 {
  66         switch (code) {
  67         case SIOCSIFADDR:
  68         case SIOCGIFADDR:
  69                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_addr);
  70                 break;
  71         case SIOCSIFDSTADDR:
  72         case SIOCGIFDSTADDR:
  73                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_dstaddr);
  74                 break;
  75         case SIOCSIFBRDADDR:
  76         case SIOCGIFBRDADDR:
  77                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_broadaddr);
  78                 break;
  79         case SIOCSIFNETMASK:
  80         case SIOCGIFNETMASK:
  81                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_netmask);
  82                 break;
  83         case SIOCSIFHWADDR:
  84         case SIOCGIFHWADDR: {
  85                 /* XXX Are there other hardware addresses
  86                    than 6-byte MACs?  */
  87                 const unsigned char *bytes =
  88                         (unsigned char *) &ifr->ifr_hwaddr.sa_data;
  89                 tprintf("ifr_hwaddr=%02x:%02x:%02x:%02x:%02x:%02x",
  90                         bytes[0], bytes[1], bytes[2],
  91                         bytes[3], bytes[4], bytes[5]);
  92                 break;
  93         }
  94         case SIOCSIFFLAGS:
  95         case SIOCGIFFLAGS:
  96                 tprints("ifr_flags=");
  97                 printflags(iffflags, (unsigned short) ifr->ifr_flags, "IFF_???");
  98                 break;
  99         case SIOCSIFMETRIC:
 100         case SIOCGIFMETRIC:
 101                 tprintf("ifr_metric=%d", ifr->ifr_metric);
 102                 break;
 103         case SIOCSIFMTU:
 104         case SIOCGIFMTU:
 105                 tprintf("ifr_mtu=%d", ifr->ifr_mtu);
 106                 break;
 107         case SIOCSIFSLAVE:
 108         case SIOCGIFSLAVE:
 109                 tprints("ifr_slave=");
 110                 print_ifname(ifr->ifr_slave);
 111                 break;
 112         case SIOCSIFTXQLEN:
 113         case SIOCGIFTXQLEN:
 114                 tprintf("ifr_qlen=%d", ifr->ifr_qlen);
 115                 break;
 116         case SIOCSIFMAP:
 117         case SIOCGIFMAP:
 118                 tprintf("ifr_map={mem_start=%#" PRI_klx ", "
 119                         "mem_end=%#" PRI_klx ", base_addr=%#x, "
 120                         "irq=%u, dma=%u, port=%u}",
 121                         (kernel_ulong_t) ifr->ifr_map.mem_start,
 122                         (kernel_ulong_t) ifr->ifr_map.mem_end,
 123                         (unsigned) ifr->ifr_map.base_addr,
 124                         (unsigned) ifr->ifr_map.irq,
 125                         (unsigned) ifr->ifr_map.dma,
 126                         (unsigned) ifr->ifr_map.port);
 127                 break;
 128         }
 129 }
 130
 131 static unsigned int
 132 print_ifc_len(int len)
 133 {
 134         const unsigned int n = (unsigned int) len / sizeof(struct_ifreq);
 135
 136         if (len < 0 || n * sizeof(struct_ifreq) != (unsigned int) len)
 137                 tprintf("%d", len);
 138         else
 139                 tprintf("%u * sizeof(struct ifreq)", n);
 140
 141         return n;
 142 }
 143
 144 static bool
 145 print_ifconf_ifreq(struct tcb *tcp, void *elem_buf, size_t elem_size,
 146                    void *dummy)
 147 {
 148         struct_ifreq *ifr = elem_buf;
 149
 150         tprints("{ifr_name=");
 151         print_ifname(ifr->ifr_name);
 152         tprints(", ");
 153         PRINT_IFREQ_ADDR(tcp, ifr, ifr_addr);
 154         tprints("}");
 155
 156         return true;
 157 }
 158
 159 /*
 160  * There are two different modes of operation:
 161  *
 162  * - Get buffer size.  In this case, the callee sets ifc_buf to NULL,
 163  *   and the kernel returns the buffer size in ifc_len.
 164  * - Get actual data.  In this case, the callee specifies the buffer address
 165  *   in ifc_buf and its size in ifc_len.  The kernel fills the buffer with
 166  *   the data, and its amount is returned in ifc_len.
 167  *
 168  * Note that, technically, the whole struct ifconf is overwritten,
 169  * so ifc_buf could be different on exit, but current ioctl handler
 170  * implementation does not touch it.
 171  */
 172 static int
 173 decode_ifconf(struct tcb *const tcp, const kernel_ulong_t addr)
 174 {
 175         struct_ifconf *entering_ifc = NULL;
 176         struct_ifconf *ifc =
 177                 entering(tcp) ? malloc(sizeof(*ifc)) : alloca(sizeof(*ifc));
 178
 179         if (exiting(tcp)) {
 180                 entering_ifc = get_tcb_priv_data(tcp);
 181
 182                 if (!entering_ifc) {
 183                         error_msg("decode_ifconf: where is my ifconf?");
 184                         return 0;
 185                 }
 186         }
 187
 188         if (!ifc || umove(tcp, addr, ifc) < 0) {
 189                 if (entering(tcp)) {
 190                         free(ifc);
 191
 192                         tprints(", ");
 193                         printaddr(addr);
 194                 } else {
 195                         /*
 196                          * We failed to fetch the structure on exiting syscall,
 197                          * print whatever was fetched on entering syscall.
 198                          */
 199                         if (!entering_ifc->ifc_buf)
 200                                 print_ifc_len(entering_ifc->ifc_len);
 201
 202                         tprints(", ifc_buf=");
 203                         printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 204
 205                         tprints("}");
 206                 }
 207
 208                 return RVAL_DECODED | 1;
 209         }
 210
 211         if (entering(tcp)) {
 212                 tprints(", {ifc_len=");
 213                 if (ifc->ifc_buf)
 214                         print_ifc_len(ifc->ifc_len);
 215
 216                 set_tcb_priv_data(tcp, ifc, free);
 217
 218                 return 1;
 219         }
 220
 221         /* exiting */
 222
 223         if (entering_ifc->ifc_buf && (entering_ifc->ifc_len != ifc->ifc_len))
 224                 tprints(" => ");
 225         if (!entering_ifc->ifc_buf || (entering_ifc->ifc_len != ifc->ifc_len))
 226                 print_ifc_len(ifc->ifc_len);
 227
 228         tprints(", ifc_buf=");
 229
 230         if (!entering_ifc->ifc_buf || syserror(tcp)) {
 231                 printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 232                 if (entering_ifc->ifc_buf != ifc->ifc_buf) {
 233                         tprints(" => ");
 234                         printaddr(ptr_to_kulong(ifc->ifc_buf));
 235                 }
 236         } else {
 237                 struct_ifreq ifr;
 238
 239                 print_array(tcp, ptr_to_kulong(ifc->ifc_buf),
 240                             ifc->ifc_len / sizeof(struct_ifreq),
 241                             &ifr, sizeof(ifr),
 242                             umoven_or_printaddr, print_ifconf_ifreq, NULL);
 243         }
 244
 245         tprints("}");
 246
 247         return RVAL_DECODED | 1;
 248 }
 249
 250 MPERS_PRINTER_DECL(int, sock_ioctl,
 251                    struct tcb *tcp, const unsigned int code,
 252                    const kernel_ulong_t arg)
 253 {
 254         struct_ifreq ifr;
 255
 256         switch (code) {
 257         case SIOCGIFCONF:
 258                 return decode_ifconf(tcp, arg);
 259
 260 #ifdef SIOCBRADDBR
 261         case SIOCBRADDBR:
 262         case SIOCBRDELBR:
 263                 tprints(", ");
 264                 printstr(tcp, arg);
 265                 break;
 266 #endif
 267
 268 #ifdef FIOSETOWN
 269         case FIOSETOWN:
 270 #endif
 271 #ifdef SIOCSPGRP
 272         case SIOCSPGRP:
 273 #endif
 274                 tprints(", ");
 275                 printnum_int(tcp, arg, "%d");
 276                 break;
 277
 278 #ifdef FIOGETOWN
 279         case FIOGETOWN:
 280 #endif
 281 #ifdef SIOCGPGRP
 282         case SIOCGPGRP:
 283 #endif
 284 #ifdef SIOCATMARK
 285         case SIOCATMARK:
 286 #endif
 287                 if (entering(tcp))
 288                         return 0;
 289                 tprints(", ");
 290                 printnum_int(tcp, arg, "%d");
 291                 break;
 292
 293 #ifdef SIOCBRADDIF
 294         case SIOCBRADDIF:
 295 #endif
 296 #ifdef SIOCBRDELIF
 297         case SIOCBRDELIF:
 298 #endif
 299                 /* no arguments */
 300                 break;
 301
 302         case SIOCSIFNAME:
 303         case SIOCSIFADDR:
 304         case SIOCSIFDSTADDR:
 305         case SIOCSIFBRDADDR:
 306         case SIOCSIFNETMASK:
 307         case SIOCSIFFLAGS:
 308         case SIOCSIFMETRIC:
 309         case SIOCSIFMTU:
 310         case SIOCSIFSLAVE:
 311         case SIOCSIFHWADDR:
 312         case SIOCSIFTXQLEN:
 313         case SIOCSIFMAP:
 314                 tprints(", ");
 315                 if (umove_or_printaddr(tcp, arg, &ifr))
 316                         break;
 317
 318                 tprints("{ifr_name=");
 319                 print_ifname(ifr.ifr_name);
 320                 tprints(", ");
 321                 if (code == SIOCSIFNAME) {
 322                         tprints("ifr_newname=");
 323                         print_ifname(ifr.ifr_newname);
 324                 } else {
 325                         print_ifreq(tcp, code, arg, &ifr);
 326                 }
 327                 tprints("}");
 328                 break;
 329
 330         case SIOCGIFNAME:
 331         case SIOCGIFINDEX:
 332         case SIOCGIFADDR:
 333         case SIOCGIFDSTADDR:
 334         case SIOCGIFBRDADDR:
 335         case SIOCGIFNETMASK:
 336         case SIOCGIFFLAGS:
 337         case SIOCGIFMETRIC:
 338         case SIOCGIFMTU:
 339         case SIOCGIFSLAVE:
 340         case SIOCGIFHWADDR:
 341         case SIOCGIFTXQLEN:
 342         case SIOCGIFMAP:
 343                 if (entering(tcp)) {
 344                         tprints(", ");
 345                         if (umove_or_printaddr(tcp, arg, &ifr))
 346                                 break;
 347
 348                         if (SIOCGIFNAME == code) {
 349                                 tprintf("{ifr_index=%d", ifr.ifr_ifindex);
 350                         } else {
 351                                 tprints("{ifr_name=");
 352                                 print_ifname(ifr.ifr_name);
 353                         }
 354                         return 1;
 355                 } else {
 356                         if (syserror(tcp)) {
 357                                 tprints("}");
 358                                 break;
 359                         }
 360
 361                         tprints(", ");
 362                         if (umove(tcp, arg, &ifr) < 0) {
 363                                 tprints("???}");
 364                                 break;
 365                         }
 366
 367                         if (SIOCGIFNAME == code) {
 368                                 tprints("ifr_name=");
 369                                 print_ifname(ifr.ifr_name);
 370                         } else {
 371                                 print_ifreq(tcp, code, arg, &ifr);
 372                         }
 373                         tprints("}");
 374                         break;
 375                 }
 376
 377         default:
 378                 return RVAL_DECODED;
 379         }
 380
 381         return RVAL_DECODED | 1;
 382 }