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