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

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "defs.h"
  29
  30 #include <sys/socket.h>
  31 #if defined ALPHA || defined SH || defined SH64
  32 # include <linux/ioctl.h>
  33 #endif
  34 #include <linux/sockios.h>
  35 #include <arpa/inet.h>
  36 #include <net/if.h>
  37
  38 #include DEF_MPERS_TYPE(struct_ifconf)
  39 #include DEF_MPERS_TYPE(struct_ifreq)
  40
  41 typedef struct ifconf struct_ifconf;
  42 typedef struct ifreq struct_ifreq;
  43
  44 #include MPERS_DEFS
  45
  46 #include "xlat/iffflags.h"
  47
  48 #define PRINT_IFREQ_ADDR(tcp, ifr, sockaddr)                                    \
  49         do {                                                                    \
  50                 tprints(#sockaddr "=");                                         \
  51                 print_sockaddr(tcp, &((ifr)->sockaddr),                         \
  52                                sizeof((ifr)->sockaddr));                        \
  53         } while (0)
  54
  55 static void
  56 print_ifname(const char *ifname)
  57 {
  58         print_quoted_string(ifname, IFNAMSIZ + 1, QUOTE_0_TERMINATED);
  59 }
  60
  61 static void
  62 print_ifreq(struct tcb *const tcp, const unsigned int code,
  63             const kernel_ulong_t arg, const struct_ifreq *const ifr)
  64 {
  65         switch (code) {
  66         case SIOCSIFADDR:
  67         case SIOCGIFADDR:
  68                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_addr);
  69                 break;
  70         case SIOCSIFDSTADDR:
  71         case SIOCGIFDSTADDR:
  72                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_dstaddr);
  73                 break;
  74         case SIOCSIFBRDADDR:
  75         case SIOCGIFBRDADDR:
  76                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_broadaddr);
  77                 break;
  78         case SIOCSIFNETMASK:
  79         case SIOCGIFNETMASK:
  80                 PRINT_IFREQ_ADDR(tcp, ifr, ifr_netmask);
  81                 break;
  82         case SIOCSIFHWADDR:
  83         case SIOCGIFHWADDR: {
  84                 /* XXX Are there other hardware addresses
  85                    than 6-byte MACs?  */
  86                 const unsigned char *bytes =
  87                         (unsigned char *) &ifr->ifr_hwaddr.sa_data;
  88                 tprintf("ifr_hwaddr=%02x:%02x:%02x:%02x:%02x:%02x",
  89                         bytes[0], bytes[1], bytes[2],
  90                         bytes[3], bytes[4], bytes[5]);
  91                 break;
  92         }
  93         case SIOCSIFFLAGS:
  94         case SIOCGIFFLAGS:
  95                 tprints("ifr_flags=");
  96                 printflags(iffflags, (unsigned short) ifr->ifr_flags, "IFF_???");
  97                 break;
  98         case SIOCSIFMETRIC:
  99         case SIOCGIFMETRIC:
 100                 tprintf("ifr_metric=%d", ifr->ifr_metric);
 101                 break;
 102         case SIOCSIFMTU:
 103         case SIOCGIFMTU:
 104                 tprintf("ifr_mtu=%d", ifr->ifr_mtu);
 105                 break;
 106         case SIOCSIFSLAVE:
 107         case SIOCGIFSLAVE:
 108                 tprints("ifr_slave=");
 109                 print_ifname(ifr->ifr_slave);
 110                 break;
 111         case SIOCSIFTXQLEN:
 112         case SIOCGIFTXQLEN:
 113                 tprintf("ifr_qlen=%d", ifr->ifr_qlen);
 114                 break;
 115         case SIOCSIFMAP:
 116         case SIOCGIFMAP:
 117                 tprintf("ifr_map={mem_start=%#" PRI_klx ", "
 118                         "mem_end=%#" PRI_klx ", base_addr=%#x, "
 119                         "irq=%u, dma=%u, port=%u}",
 120                         (kernel_ulong_t) ifr->ifr_map.mem_start,
 121                         (kernel_ulong_t) ifr->ifr_map.mem_end,
 122                         (unsigned) ifr->ifr_map.base_addr,
 123                         (unsigned) ifr->ifr_map.irq,
 124                         (unsigned) ifr->ifr_map.dma,
 125                         (unsigned) ifr->ifr_map.port);
 126                 break;
 127         }
 128 }
 129
 130 static unsigned int
 131 print_ifc_len(int len)
 132 {
 133         const unsigned int n = (unsigned int) len / sizeof(struct_ifreq);
 134
 135         if (len < 0 || n * sizeof(struct_ifreq) != (unsigned int) len)
 136                 tprintf("%d", len);
 137         else
 138                 tprintf("%u * sizeof(struct ifreq)", n);
 139
 140         return n;
 141 }
 142
 143 static bool
 144 print_ifconf_ifreq(struct tcb *tcp, void *elem_buf, size_t elem_size,
 145                    void *dummy)
 146 {
 147         struct_ifreq *ifr = elem_buf;
 148
 149         tprints("{ifr_name=");
 150         print_ifname(ifr->ifr_name);
 151         tprints(", ");
 152         PRINT_IFREQ_ADDR(tcp, ifr, ifr_addr);
 153         tprints("}");
 154
 155         return true;
 156 }
 157
 158 /*
 159  * There are two different modes of operation:
 160  *
 161  * - Get buffer size.  In this case, the callee sets ifc_buf to NULL,
 162  *   and the kernel returns the buffer size in ifc_len.
 163  * - Get actual data.  In this case, the callee specifies the buffer address
 164  *   in ifc_buf and its size in ifc_len.  The kernel fills the buffer with
 165  *   the data, and its amount is returned in ifc_len.
 166  *
 167  * Note that, technically, the whole struct ifconf is overwritten,
 168  * so ifc_buf could be different on exit, but current ioctl handler
 169  * implementation does not touch it.
 170  */
 171 static int
 172 decode_ifconf(struct tcb *const tcp, const kernel_ulong_t addr)
 173 {
 174         struct_ifconf *entering_ifc = NULL;
 175         struct_ifconf *ifc =
 176                 entering(tcp) ? malloc(sizeof(*ifc)) : alloca(sizeof(*ifc));
 177
 178         if (exiting(tcp)) {
 179                 entering_ifc = get_tcb_priv_data(tcp);
 180
 181                 if (!entering_ifc) {
 182                         error_msg("decode_ifconf: where is my ifconf?");
 183                         return 0;
 184                 }
 185         }
 186
 187         if (!ifc || umove(tcp, addr, ifc) < 0) {
 188                 if (entering(tcp)) {
 189                         free(ifc);
 190
 191                         tprints(", ");
 192                         printaddr(addr);
 193                 } else {
 194                         /*
 195                          * We failed to fetch the structure on exiting syscall,
 196                          * print whatever was fetched on entering syscall.
 197                          */
 198                         if (!entering_ifc->ifc_buf)
 199                                 print_ifc_len(entering_ifc->ifc_len);
 200
 201                         tprints(", ifc_buf=");
 202                         printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 203
 204                         tprints("}");
 205                 }
 206
 207                 return RVAL_DECODED | 1;
 208         }
 209
 210         if (entering(tcp)) {
 211                 tprints(", {ifc_len=");
 212                 if (ifc->ifc_buf)
 213                         print_ifc_len(ifc->ifc_len);
 214
 215                 set_tcb_priv_data(tcp, ifc, free);
 216
 217                 return 1;
 218         }
 219
 220         /* exiting */
 221
 222         if (entering_ifc->ifc_buf && (entering_ifc->ifc_len != ifc->ifc_len))
 223                 tprints(" => ");
 224         if (!entering_ifc->ifc_buf || (entering_ifc->ifc_len != ifc->ifc_len))
 225                 print_ifc_len(ifc->ifc_len);
 226
 227         tprints(", ifc_buf=");
 228
 229         if (!entering_ifc->ifc_buf || syserror(tcp)) {
 230                 printaddr(ptr_to_kulong(entering_ifc->ifc_buf));
 231                 if (entering_ifc->ifc_buf != ifc->ifc_buf) {
 232                         tprints(" => ");
 233                         printaddr(ptr_to_kulong(ifc->ifc_buf));
 234                 }
 235         } else {
 236                 struct_ifreq ifr;
 237
 238                 print_array(tcp, ptr_to_kulong(ifc->ifc_buf),
 239                             ifc->ifc_len / sizeof(struct_ifreq),
 240                             &ifr, sizeof(ifr),
 241                             umoven_or_printaddr, print_ifconf_ifreq, NULL);
 242         }
 243
 244         tprints("}");
 245
 246         return RVAL_DECODED | 1;
 247 }
 248
 249 MPERS_PRINTER_DECL(int, sock_ioctl,
 250                    struct tcb *tcp, const unsigned int code,
 251                    const kernel_ulong_t arg)
 252 {
 253         struct_ifreq ifr;
 254
 255         switch (code) {
 256         case SIOCGIFCONF:
 257                 return decode_ifconf(tcp, arg);
 258
 259 #ifdef SIOCBRADDBR
 260         case SIOCBRADDBR:
 261         case SIOCBRDELBR:
 262                 tprints(", ");
 263                 printstr(tcp, arg);
 264                 break;
 265 #endif
 266
 267 #ifdef FIOSETOWN
 268         case FIOSETOWN:
 269 #endif
 270 #ifdef SIOCSPGRP
 271         case SIOCSPGRP:
 272 #endif
 273                 tprints(", ");
 274                 printnum_int(tcp, arg, "%d");
 275                 break;
 276
 277 #ifdef FIOGETOWN
 278         case FIOGETOWN:
 279 #endif
 280 #ifdef SIOCGPGRP
 281         case SIOCGPGRP:
 282 #endif
 283 #ifdef SIOCATMARK
 284         case SIOCATMARK:
 285 #endif
 286                 if (entering(tcp))
 287                         return 0;
 288                 tprints(", ");
 289                 printnum_int(tcp, arg, "%d");
 290                 break;
 291
 292 #ifdef SIOCBRADDIF
 293         case SIOCBRADDIF:
 294 #endif
 295 #ifdef SIOCBRDELIF
 296         case SIOCBRDELIF:
 297 #endif
 298                 /* no arguments */
 299                 break;
 300
 301         case SIOCSIFNAME:
 302         case SIOCSIFADDR:
 303         case SIOCSIFDSTADDR:
 304         case SIOCSIFBRDADDR:
 305         case SIOCSIFNETMASK:
 306         case SIOCSIFFLAGS:
 307         case SIOCSIFMETRIC:
 308         case SIOCSIFMTU:
 309         case SIOCSIFSLAVE:
 310         case SIOCSIFHWADDR:
 311         case SIOCSIFTXQLEN:
 312         case SIOCSIFMAP:
 313                 tprints(", ");
 314                 if (umove_or_printaddr(tcp, arg, &ifr))
 315                         break;
 316
 317                 tprints("{ifr_name=");
 318                 print_ifname(ifr.ifr_name);
 319                 tprints(", ");
 320                 if (code == SIOCSIFNAME) {
 321                         tprints("ifr_newname=");
 322                         print_ifname(ifr.ifr_newname);
 323                 } else {
 324                         print_ifreq(tcp, code, arg, &ifr);
 325                 }
 326                 tprints("}");
 327                 break;
 328
 329         case SIOCGIFNAME:
 330         case SIOCGIFINDEX:
 331         case SIOCGIFADDR:
 332         case SIOCGIFDSTADDR:
 333         case SIOCGIFBRDADDR:
 334         case SIOCGIFNETMASK:
 335         case SIOCGIFFLAGS:
 336         case SIOCGIFMETRIC:
 337         case SIOCGIFMTU:
 338         case SIOCGIFSLAVE:
 339         case SIOCGIFHWADDR:
 340         case SIOCGIFTXQLEN:
 341         case SIOCGIFMAP:
 342                 if (entering(tcp)) {
 343                         tprints(", ");
 344                         if (umove_or_printaddr(tcp, arg, &ifr))
 345                                 break;
 346
 347                         if (SIOCGIFNAME == code) {
 348                                 tprintf("{ifr_index=%d", ifr.ifr_ifindex);
 349                         } else {
 350                                 tprints("{ifr_name=");
 351                                 print_ifname(ifr.ifr_name);
 352                         }
 353                         return 1;
 354                 } else {
 355                         if (syserror(tcp)) {
 356                                 tprints("}");
 357                                 break;
 358                         }
 359
 360                         tprints(", ");
 361                         if (umove(tcp, arg, &ifr) < 0) {
 362                                 tprints("???}");
 363                                 break;
 364                         }
 365
 366                         if (SIOCGIFNAME == code) {
 367                                 tprints("ifr_name=");
 368                                 print_ifname(ifr.ifr_name);
 369                         } else {
 370                                 print_ifreq(tcp, code, arg, &ifr);
 371                         }
 372                         tprints("}");
 373                         break;
 374                 }
 375
 376         default:
 377                 return RVAL_DECODED;
 378         }
 379
 380         return RVAL_DECODED | 1;
 381 }