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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-2000 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999-2018 The strace developers.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "defs.h"
  33 #include "print_fields.h"
  34
  35 #include <sys/stat.h>
  36 #include <sys/socket.h>
  37 #include <sys/uio.h>
  38 #include <sys/un.h>
  39 #include <netinet/in.h>
  40 #ifdef HAVE_NETINET_TCP_H
  41 # include <netinet/tcp.h>
  42 #endif
  43 #ifdef HAVE_NETINET_UDP_H
  44 # include <netinet/udp.h>
  45 #endif
  46 #ifdef HAVE_NETINET_SCTP_H
  47 # include <netinet/sctp.h>
  48 #endif
  49 #include <arpa/inet.h>
  50 #include <net/if.h>
  51 #include <asm/types.h>
  52 #ifdef HAVE_NETIPX_IPX_H
  53 # include <netipx/ipx.h>
  54 #else
  55 # include <linux/ipx.h>
  56 #endif
  57
  58 #if defined(HAVE_LINUX_IP_VS_H)
  59 # include <linux/ip_vs.h>
  60 #endif
  61 #include "netlink.h"
  62 #if defined(HAVE_LINUX_NETFILTER_ARP_ARP_TABLES_H)
  63 # include <linux/netfilter_arp/arp_tables.h>
  64 #endif
  65 #if defined(HAVE_LINUX_NETFILTER_BRIDGE_EBTABLES_H)
  66 # include <linux/netfilter_bridge/ebtables.h>
  67 #endif
  68 #if defined(HAVE_LINUX_NETFILTER_IPV4_IP_TABLES_H)
  69 # include <linux/netfilter_ipv4/ip_tables.h>
  70 #endif
  71 #if defined(HAVE_LINUX_NETFILTER_IPV6_IP6_TABLES_H)
  72 # include <linux/netfilter_ipv6/ip6_tables.h>
  73 #endif
  74 #include <linux/if_packet.h>
  75 #include <linux/icmp.h>
  76
  77 #include "xlat/socktypes.h"
  78 #include "xlat/sock_type_flags.h"
  79 #ifndef SOCK_TYPE_MASK
  80 # define SOCK_TYPE_MASK 0xf
  81 #endif
  82
  83 #include "xlat/socketlayers.h"
  84
  85 #include "xlat/inet_protocols.h"
  86
  87 #define XLAT_MACROS_ONLY
  88 # include "xlat/addrfams.h"
  89 #undef XLAT_MACROS_ONLY
  90 #include "xlat/irda_protocols.h"
  91 #include "xlat/can_protocols.h"
  92 #include "xlat/bt_protocols.h"
  93 #include "xlat/isdn_protocols.h"
  94 #include "xlat/phonet_protocols.h"
  95 #include "xlat/caif_protocols.h"
  96 #include "xlat/nfc_protocols.h"
  97 #include "xlat/kcm_protocols.h"
  98 #include "xlat/smc_protocols.h"
  99
 100 const size_t inet_protocols_size = ARRAY_SIZE(inet_protocols) - 1;
 101
 102 static void
 103 decode_sockbuf(struct tcb *const tcp, const int fd, const kernel_ulong_t addr,
 104                const kernel_ulong_t addrlen)
 105 {
 106
 107         switch (verbose(tcp) ? getfdproto(tcp, fd) : SOCK_PROTO_UNKNOWN) {
 108         case SOCK_PROTO_NETLINK:
 109                 decode_netlink(tcp, fd, addr, addrlen);
 110                 break;
 111         default:
 112                 printstrn(tcp, addr, addrlen);
 113         }
 114 }
 115
 116 /*
 117  * low bits of the socket type define real socket type,
 118  * other bits are socket type flags.
 119  */
 120 static void
 121 tprint_sock_type(unsigned int flags)
 122 {
 123         const char *str = xlookup(socktypes, flags & SOCK_TYPE_MASK);
 124
 125         if (str) {
 126                 print_xlat_ex(flags & SOCK_TYPE_MASK, str, XLAT_STYLE_DEFAULT);
 127                 flags &= ~SOCK_TYPE_MASK;
 128                 if (!flags)
 129                         return;
 130                 tprints("|");
 131         }
 132         printflags(sock_type_flags, flags, "SOCK_???");
 133 }
 134
 135 SYS_FUNC(socket)
 136 {
 137         printxval(addrfams, tcp->u_arg[0], "AF_???");
 138         tprints(", ");
 139         tprint_sock_type(tcp->u_arg[1]);
 140         tprints(", ");
 141         switch (tcp->u_arg[0]) {
 142         case AF_INET:
 143         case AF_INET6:
 144                 printxval_search(inet_protocols, tcp->u_arg[2], "IPPROTO_???");
 145                 break;
 146
 147         case AF_NETLINK:
 148                 printxval(netlink_protocols, tcp->u_arg[2], "NETLINK_???");
 149                 break;
 150
 151         case AF_IRDA:
 152                 printxval_index(can_protocols, tcp->u_arg[2], "IRDAPROTO_???");
 153                 break;
 154
 155         case AF_CAN:
 156                 printxval_index(can_protocols, tcp->u_arg[2], "CAN_???");
 157                 break;
 158
 159         case AF_BLUETOOTH:
 160                 printxval_index(bt_protocols, tcp->u_arg[2], "BTPROTO_???");
 161                 break;
 162
 163         case AF_RXRPC:
 164                 printxval(addrfams, tcp->u_arg[2], "AF_???");
 165                 break;
 166
 167         case AF_ISDN:
 168                 printxval(isdn_protocols, tcp->u_arg[2], "ISDN_P_???");
 169                 break;
 170
 171         case AF_PHONET:
 172                 printxval_index(phonet_protocols, tcp->u_arg[2], "PN_PROTO_???");
 173                 break;
 174
 175         case AF_CAIF:
 176                 printxval_index(caif_protocols, tcp->u_arg[2], "CAIFPROTO_???");
 177                 break;
 178
 179         case AF_NFC:
 180                 printxval_index(nfc_protocols, tcp->u_arg[2],
 181                                 "NFC_SOCKPROTO_???");
 182                 break;
 183
 184         case AF_KCM:
 185                 printxval_index(kcm_protocols, tcp->u_arg[2], "KCMPROTO_???");
 186                 break;
 187
 188         case AF_SMC:
 189                 printxval_index(smc_protocols, tcp->u_arg[2], "SMCPROTO_???");
 190                 break;
 191
 192         default:
 193                 tprintf("%" PRI_klu, tcp->u_arg[2]);
 194                 break;
 195         }
 196
 197         return RVAL_DECODED | RVAL_FD;
 198 }
 199
 200 static bool
 201 fetch_socklen(struct tcb *const tcp, int *const plen,
 202               const kernel_ulong_t sockaddr, const kernel_ulong_t socklen)
 203 {
 204         return verbose(tcp) && sockaddr && socklen
 205                && umove(tcp, socklen, plen) == 0;
 206 }
 207
 208 static int
 209 decode_sockname(struct tcb *tcp)
 210 {
 211         int ulen, rlen;
 212
 213         if (entering(tcp)) {
 214                 printfd(tcp, tcp->u_arg[0]);
 215                 tprints(", ");
 216                 if (fetch_socklen(tcp, &ulen, tcp->u_arg[1], tcp->u_arg[2])) {
 217                         set_tcb_priv_ulong(tcp, ulen);
 218                         return 0;
 219                 } else {
 220                         printaddr(tcp->u_arg[1]);
 221                         tprints(", ");
 222                         printaddr(tcp->u_arg[2]);
 223                         return RVAL_DECODED;
 224                 }
 225         }
 226
 227         ulen = get_tcb_priv_ulong(tcp);
 228
 229         if (syserror(tcp) || umove(tcp, tcp->u_arg[2], &rlen) < 0) {
 230                 printaddr(tcp->u_arg[1]);
 231                 tprintf(", [%d]", ulen);
 232         } else {
 233                 decode_sockaddr(tcp, tcp->u_arg[1], ulen > rlen ? rlen : ulen);
 234                 if (ulen != rlen)
 235                         tprintf(", [%d->%d]", ulen, rlen);
 236                 else
 237                         tprintf(", [%d]", rlen);
 238         }
 239
 240         return RVAL_DECODED;
 241 }
 242
 243 SYS_FUNC(accept)
 244 {
 245         return decode_sockname(tcp) | RVAL_FD;
 246 }
 247
 248 SYS_FUNC(accept4)
 249 {
 250         int rc = decode_sockname(tcp);
 251
 252         if (rc & RVAL_DECODED) {
 253                 tprints(", ");
 254                 printflags(sock_type_flags, tcp->u_arg[3], "SOCK_???");
 255         }
 256
 257         return rc | RVAL_FD;
 258 }
 259
 260 SYS_FUNC(send)
 261 {
 262         printfd(tcp, tcp->u_arg[0]);
 263         tprints(", ");
 264         decode_sockbuf(tcp, tcp->u_arg[0], tcp->u_arg[1], tcp->u_arg[2]);
 265         tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
 266         /* flags */
 267         printflags(msg_flags, tcp->u_arg[3], "MSG_???");
 268
 269         return RVAL_DECODED;
 270 }
 271
 272 SYS_FUNC(sendto)
 273 {
 274         printfd(tcp, tcp->u_arg[0]);
 275         tprints(", ");
 276         decode_sockbuf(tcp, tcp->u_arg[0], tcp->u_arg[1], tcp->u_arg[2]);
 277         tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
 278         /* flags */
 279         printflags(msg_flags, tcp->u_arg[3], "MSG_???");
 280         /* to address */
 281         const int addrlen = tcp->u_arg[5];
 282         tprints(", ");
 283         decode_sockaddr(tcp, tcp->u_arg[4], addrlen);
 284         /* to length */
 285         tprintf(", %d", addrlen);
 286
 287         return RVAL_DECODED;
 288 }
 289
 290 SYS_FUNC(recv)
 291 {
 292         if (entering(tcp)) {
 293                 printfd(tcp, tcp->u_arg[0]);
 294                 tprints(", ");
 295         } else {
 296                 if (syserror(tcp)) {
 297                         printaddr(tcp->u_arg[1]);
 298                 } else {
 299                         decode_sockbuf(tcp, tcp->u_arg[0], tcp->u_arg[1],
 300                                      tcp->u_rval);
 301                 }
 302
 303                 tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
 304                 printflags(msg_flags, tcp->u_arg[3], "MSG_???");
 305         }
 306         return 0;
 307 }
 308
 309 SYS_FUNC(recvfrom)
 310 {
 311         int ulen, rlen;
 312
 313         if (entering(tcp)) {
 314                 printfd(tcp, tcp->u_arg[0]);
 315                 tprints(", ");
 316                 if (fetch_socklen(tcp, &ulen, tcp->u_arg[4], tcp->u_arg[5])) {
 317                         set_tcb_priv_ulong(tcp, ulen);
 318                 }
 319         } else {
 320                 /* buf */
 321                 if (syserror(tcp)) {
 322                         printaddr(tcp->u_arg[1]);
 323                 } else {
 324                         decode_sockbuf(tcp, tcp->u_arg[0], tcp->u_arg[1],
 325                                      tcp->u_rval);
 326                 }
 327                 /* size */
 328                 tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
 329                 /* flags */
 330                 printflags(msg_flags, tcp->u_arg[3], "MSG_???");
 331                 tprints(", ");
 332
 333                 ulen = get_tcb_priv_ulong(tcp);
 334
 335                 if (!fetch_socklen(tcp, &rlen, tcp->u_arg[4], tcp->u_arg[5])) {
 336                         /* from address */
 337                         printaddr(tcp->u_arg[4]);
 338                         tprints(", ");
 339                         /* from length */
 340                         printaddr(tcp->u_arg[5]);
 341                         return 0;
 342                 }
 343                 if (syserror(tcp)) {
 344                         /* from address */
 345                         printaddr(tcp->u_arg[4]);
 346                         /* from length */
 347                         tprintf(", [%d]", ulen);
 348                         return 0;
 349                 }
 350                 /* from address */
 351                 decode_sockaddr(tcp, tcp->u_arg[4], ulen > rlen ? rlen : ulen);
 352                 /* from length */
 353                 if (ulen != rlen)
 354                         tprintf(", [%d->%d]", ulen, rlen);
 355                 else
 356                         tprintf(", [%d]", rlen);
 357         }
 358         return 0;
 359 }
 360
 361 SYS_FUNC(getsockname)
 362 {
 363         return decode_sockname(tcp);
 364 }
 365
 366 static void
 367 printpair_fd(struct tcb *tcp, const int i0, const int i1)
 368 {
 369         tprints("[");
 370         printfd(tcp, i0);
 371         tprints(", ");
 372         printfd(tcp, i1);
 373         tprints("]");
 374 }
 375
 376 static void
 377 decode_pair_fd(struct tcb *const tcp, const kernel_ulong_t addr)
 378 {
 379         int pair[2];
 380
 381         if (umove_or_printaddr(tcp, addr, &pair))
 382                 return;
 383
 384         printpair_fd(tcp, pair[0], pair[1]);
 385 }
 386
 387 static int
 388 do_pipe(struct tcb *tcp, int flags_arg)
 389 {
 390         if (exiting(tcp)) {
 391                 decode_pair_fd(tcp, tcp->u_arg[0]);
 392                 if (flags_arg >= 0) {
 393                         tprints(", ");
 394                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
 395                 }
 396         }
 397         return 0;
 398 }
 399
 400 SYS_FUNC(pipe)
 401 {
 402 #if HAVE_ARCH_GETRVAL2
 403         if (exiting(tcp) && !syserror(tcp))
 404                 printpair_fd(tcp, tcp->u_rval, getrval2(tcp));
 405         return 0;
 406 #else
 407         return do_pipe(tcp, -1);
 408 #endif
 409 }
 410
 411 SYS_FUNC(pipe2)
 412 {
 413         return do_pipe(tcp, 1);
 414 }
 415
 416 SYS_FUNC(socketpair)
 417 {
 418         if (entering(tcp)) {
 419                 printxval(addrfams, tcp->u_arg[0], "AF_???");
 420                 tprints(", ");
 421                 tprint_sock_type(tcp->u_arg[1]);
 422                 tprintf(", %" PRI_klu, tcp->u_arg[2]);
 423         } else {
 424                 tprints(", ");
 425                 decode_pair_fd(tcp, tcp->u_arg[3]);
 426         }
 427         return 0;
 428 }
 429
 430 #include "xlat/sock_options.h"
 431 #include "xlat/getsock_options.h"
 432 #include "xlat/setsock_options.h"
 433 #include "xlat/sock_ip_options.h"
 434 #include "xlat/getsock_ip_options.h"
 435 #include "xlat/setsock_ip_options.h"
 436 #include "xlat/sock_ipv6_options.h"
 437 #include "xlat/getsock_ipv6_options.h"
 438 #include "xlat/setsock_ipv6_options.h"
 439 #include "xlat/sock_ipx_options.h"
 440 #include "xlat/sock_netlink_options.h"
 441 #include "xlat/sock_packet_options.h"
 442 #include "xlat/sock_raw_options.h"
 443 #include "xlat/sock_sctp_options.h"
 444 #include "xlat/sock_tcp_options.h"
 445 #include "xlat/sock_udp_options.h"
 446 #include "xlat/sock_irda_options.h"
 447 #include "xlat/sock_llc_options.h"
 448 #include "xlat/sock_dccp_options.h"
 449 #include "xlat/sock_tipc_options.h"
 450 #include "xlat/sock_rxrpc_options.h"
 451 #include "xlat/sock_pppol2tp_options.h"
 452 #include "xlat/sock_bluetooth_options.h"
 453 #include "xlat/sock_pnp_options.h"
 454 #include "xlat/sock_rds_options.h"
 455 #include "xlat/sock_iucv_options.h"
 456 #include "xlat/sock_caif_options.h"
 457 #include "xlat/sock_alg_options.h"
 458 #include "xlat/sock_nfcllcp_options.h"
 459 #include "xlat/sock_kcm_options.h"
 460 #include "xlat/sock_tls_options.h"
 461
 462 static void
 463 print_sockopt_fd_level_name(struct tcb *tcp, int fd, unsigned int level,
 464                             unsigned int name, bool is_getsockopt)
 465 {
 466         printfd(tcp, fd);
 467         tprints(", ");
 468         printxval_search(socketlayers, level, "SOL_??");
 469         tprints(", ");
 470
 471         switch (level) {
 472         case SOL_SOCKET:
 473                 printxvals(name, "SO_???", sock_options,
 474                            is_getsockopt ? getsock_options :
 475                                            setsock_options, NULL);
 476                 break;
 477         case SOL_IP:
 478                 printxvals(name, "IP_???", sock_ip_options,
 479                            is_getsockopt ? getsock_ip_options :
 480                                            setsock_ip_options, NULL);
 481                 break;
 482         case SOL_IPV6:
 483                 printxvals(name, "IPV6_???", sock_ipv6_options,
 484                            is_getsockopt ? getsock_ipv6_options :
 485                                            setsock_ipv6_options, NULL);
 486                 break;
 487         case SOL_IPX:
 488                 printxval(sock_ipx_options, name, "IPX_???");
 489                 break;
 490         case SOL_PACKET:
 491                 printxval(sock_packet_options, name, "PACKET_???");
 492                 break;
 493         case SOL_TCP:
 494                 printxval_index(sock_tcp_options, name, "TCP_???");
 495                 break;
 496         case SOL_SCTP:
 497                 printxval(sock_sctp_options, name, "SCTP_???");
 498                 break;
 499         case SOL_RAW:
 500                 printxval(sock_raw_options, name, "RAW_???");
 501                 break;
 502         case SOL_NETLINK:
 503                 printxval(sock_netlink_options, name, "NETLINK_???");
 504                 break;
 505         case SOL_UDP:
 506                 printxval(sock_udp_options, name, "UDP_???");
 507                 break;
 508         case SOL_IRDA:
 509                 printxval_index(sock_irda_options, name, "IRLMP_???");
 510                 break;
 511         case SOL_LLC:
 512                 printxval_index(sock_llc_options, name, "LLC_OPT_???");
 513                 break;
 514         case SOL_DCCP:
 515                 printxval_search(sock_dccp_options, name, "DCCP_SOCKOPT_???");
 516                 break;
 517         case SOL_TIPC:
 518                 printxval_search(sock_tipc_options, name, "TIPC_???");
 519                 break;
 520         case SOL_RXRPC:
 521                 printxval_index(sock_rxrpc_options, name, "RXRPC_???");
 522                 break;
 523         case SOL_PPPOL2TP:
 524                 printxval_index(sock_pppol2tp_options, name, "PPPOL2TP_SO_???");
 525                 break;
 526         case SOL_BLUETOOTH:
 527                 printxval_search(sock_bluetooth_options, name, "BT_???");
 528                 break;
 529         case SOL_PNPIPE:
 530                 printxval(sock_pnp_options, name, "PNPIPE_???");
 531                 break;
 532         case SOL_RDS:
 533                 printxval_search(sock_rds_options, name, "RDS_???");
 534                 break;
 535         case SOL_IUCV:
 536                 printxval(sock_iucv_options, name, "SO_???");
 537                 break;
 538         case SOL_CAIF:
 539                 printxval(sock_caif_options, name, "CAIFSO_???");
 540                 break;
 541         case SOL_ALG:
 542                 printxval_index(sock_alg_options, name, "ALG_???");
 543                 break;
 544         case SOL_NFC:
 545                 printxval_index(sock_nfcllcp_options, name, "NFC_LLCP_???");
 546                 break;
 547         case SOL_KCM:
 548                 printxval(sock_kcm_options, name, "KCM_???");
 549                 break;
 550         case SOL_TLS:
 551                 printxval(sock_tls_options, name, "TLS_???");
 552                 break;
 553
 554                 /* Other SOL_* protocol levels still need work. */
 555
 556         default:
 557                 tprintf("%u", name);
 558         }
 559
 560         tprints(", ");
 561 }
 562
 563 static void
 564 print_get_linger(struct tcb *const tcp, const kernel_ulong_t addr,
 565                  unsigned int len)
 566 {
 567         struct linger linger;
 568
 569         /*
 570          * The kernel cannot return len > sizeof(linger) because struct linger
 571          * cannot change, but extra safety won't harm either.
 572          */
 573         if (len > sizeof(linger))
 574                 len = sizeof(linger);
 575         if (umoven_or_printaddr(tcp, addr, len, &linger))
 576                 return;
 577
 578         if (len < sizeof(linger.l_onoff)) {
 579                 tprints("{l_onoff=");
 580                 print_quoted_string((void *) &linger.l_onoff,
 581                                     len, QUOTE_FORCE_HEX);
 582         } else {
 583                 PRINT_FIELD_D("{", linger, l_onoff);
 584
 585                 if (len > offsetof(struct linger, l_linger)) {
 586                         len -= offsetof(struct linger, l_linger);
 587                         if (len < sizeof(linger.l_linger)) {
 588                                 tprints(", l_linger=");
 589                                 print_quoted_string((void *) &linger.l_linger,
 590                                                     len, QUOTE_FORCE_HEX);
 591                         } else {
 592                                 PRINT_FIELD_D(", ", linger, l_linger);
 593                         }
 594                 }
 595         }
 596         tprints("}");
 597 }
 598
 599 static void
 600 print_get_ucred(struct tcb *const tcp, const kernel_ulong_t addr,
 601                 unsigned int len)
 602 {
 603         struct ucred uc;
 604
 605         /*
 606          * The kernel is very unlikely to return len > sizeof(uc)
 607          * because struct ucred is very unlikely to change,
 608          * but extra safety won't harm either.
 609          */
 610         if (len > sizeof(uc))
 611                 len = sizeof(uc);
 612
 613         if (umoven_or_printaddr(tcp, addr, len, &uc))
 614                 return;
 615
 616         if (len < sizeof(uc.pid)) {
 617                 tprints("{pid=");
 618                 print_quoted_string((void *) &uc.pid,
 619                                     len, QUOTE_FORCE_HEX);
 620         } else {
 621                 PRINT_FIELD_D("{", uc, pid);
 622
 623                 if (len > offsetof(struct ucred, uid)) {
 624                         len -= offsetof(struct ucred, uid);
 625                         if (len < sizeof(uc.uid)) {
 626                                 tprints(", uid=");
 627                                 print_quoted_string((void *) &uc.uid,
 628                                                     len, QUOTE_FORCE_HEX);
 629                         } else {
 630                                 PRINT_FIELD_UID(", ", uc, uid);
 631
 632                                 if (len > offsetof(struct ucred, gid) -
 633                                           offsetof(struct ucred, uid)) {
 634                                         len -= offsetof(struct ucred, gid) -
 635                                                offsetof(struct ucred, uid);
 636                                         if (len < sizeof(uc.gid)) {
 637                                                 tprints(", gid=");
 638                                                 print_quoted_string((void *) &uc.gid,
 639                                                                     len,
 640                                                                     QUOTE_FORCE_HEX);
 641                                         } else {
 642                                                 PRINT_FIELD_UID(", ", uc, gid);
 643                                         }
 644                                 }
 645                         }
 646                 }
 647         }
 648         tprints("}");
 649 }
 650
 651 #ifdef PACKET_STATISTICS
 652 static void
 653 print_tpacket_stats(struct tcb *const tcp, const kernel_ulong_t addr,
 654                     unsigned int len)
 655 {
 656         struct tp_stats {
 657                 unsigned int tp_packets, tp_drops, tp_freeze_q_cnt;
 658         } stats;
 659
 660         /*
 661          * The kernel may return len > sizeof(stats) if the kernel structure
 662          * grew as it happened when tpacket_stats_v3 was introduced.
 663          */
 664         if (len > sizeof(stats))
 665                 len = sizeof(stats);
 666
 667         if (umoven_or_printaddr(tcp, addr, len, &stats))
 668                 return;
 669
 670         if (len < sizeof(stats.tp_packets)) {
 671                 tprints("{tp_packets=");
 672                 print_quoted_string((void *) &stats.tp_packets,
 673                                     len, QUOTE_FORCE_HEX);
 674         } else {
 675                 PRINT_FIELD_U("{", stats, tp_packets);
 676
 677                 if (len > offsetof(struct tp_stats, tp_drops)) {
 678                         len -= offsetof(struct tp_stats, tp_drops);
 679                         if (len < sizeof(stats.tp_drops)) {
 680                                 tprints(", tp_drops=");
 681                                 print_quoted_string((void *) &stats.tp_drops,
 682                                                     len, QUOTE_FORCE_HEX);
 683                         } else {
 684                                 PRINT_FIELD_U(", ", stats, tp_drops);
 685
 686                                 if (len > offsetof(struct tp_stats, tp_freeze_q_cnt) -
 687                                           offsetof(struct tp_stats, tp_drops)) {
 688                                         len -= offsetof(struct tp_stats, tp_freeze_q_cnt) -
 689                                                offsetof(struct tp_stats, tp_drops);
 690                                         if (len < sizeof(stats.tp_freeze_q_cnt)) {
 691                                                 tprints(", tp_freeze_q_cnt=");
 692                                                 print_quoted_string((void *) &stats.tp_freeze_q_cnt,
 693                                                                     len,
 694                                                                     QUOTE_FORCE_HEX);
 695                                         } else {
 696                                                 PRINT_FIELD_U(", ", stats, tp_freeze_q_cnt);
 697                                         }
 698                                 }
 699                         }
 700                 }
 701         }
 702         tprints("}");
 703 }
 704 #endif /* PACKET_STATISTICS */
 705
 706 #include "xlat/icmpfilterflags.h"
 707
 708 static void
 709 print_icmp_filter(struct tcb *const tcp, const kernel_ulong_t addr, int len)
 710 {
 711         struct icmp_filter filter = {};
 712
 713         if (len > (int) sizeof(filter))
 714                 len = sizeof(filter);
 715         else if (len <= 0) {
 716                 printaddr(addr);
 717                 return;
 718         }
 719
 720         if (umoven_or_printaddr(tcp, addr, len, &filter))
 721                 return;
 722
 723         tprints("~(");
 724         printflags(icmpfilterflags, ~filter.data, "ICMP_???");
 725         tprints(")");
 726 }
 727
 728 static bool
 729 print_uint32(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 730 {
 731         tprintf("%u", *(uint32_t *) elem_buf);
 732
 733         return true;
 734 }
 735
 736 static void
 737 print_getsockopt(struct tcb *const tcp, const unsigned int level,
 738                  const unsigned int name, const kernel_ulong_t addr,
 739                  const int ulen, const int rlen)
 740 {
 741         if (ulen <= 0 || rlen <= 0) {
 742                 /*
 743                  * As the kernel neither accepts nor returns a negative
 744                  * length in case of successful getsockopt syscall
 745                  * invocation, negative values must have been forged
 746                  * by userspace.
 747                  */
 748                 printaddr(addr);
 749                 return;
 750         }
 751
 752         if (addr && verbose(tcp))
 753         switch (level) {
 754         case SOL_SOCKET:
 755                 switch (name) {
 756                 case SO_LINGER:
 757                         print_get_linger(tcp, addr, rlen);
 758                         return;
 759                 case SO_PEERCRED:
 760                         print_get_ucred(tcp, addr, rlen);
 761                         return;
 762                 case SO_ATTACH_FILTER:
 763                         /*
 764                          * The length returned by the kernel in case of
 765                          * successful getsockopt syscall invocation is struct
 766                          * sock_fprog.len that has type unsigned short,
 767                          * anything else must have been forged by userspace.
 768                          */
 769                         if ((unsigned short) rlen == (unsigned int) rlen)
 770                                 print_sock_fprog(tcp, addr, rlen);
 771                         else
 772                                 printaddr(addr);
 773                         return;
 774                 }
 775                 break;
 776
 777         case SOL_PACKET:
 778                 switch (name) {
 779 #ifdef PACKET_STATISTICS
 780                 case PACKET_STATISTICS:
 781                         print_tpacket_stats(tcp, addr, rlen);
 782                         return;
 783 #endif
 784                 }
 785                 break;
 786
 787         case SOL_RAW:
 788                 switch (name) {
 789                 case ICMP_FILTER:
 790                         print_icmp_filter(tcp, addr, rlen);
 791                         return;
 792                 }
 793                 break;
 794
 795         case SOL_NETLINK:
 796                 switch (name) {
 797                 case NETLINK_LIST_MEMBERSHIPS: {
 798                         uint32_t buf;
 799                         print_array(tcp, addr, MIN(ulen, rlen) / sizeof(buf),
 800                                     &buf, sizeof(buf),
 801                                     tfetch_mem, print_uint32, 0);
 802                         break;
 803                         }
 804                 default:
 805                         printnum_int(tcp, addr, "%d");
 806                         break;
 807                 }
 808                 return;
 809         }
 810
 811         /* default arg printing */
 812
 813         if (verbose(tcp)) {
 814                 if (rlen == sizeof(int)) {
 815                         printnum_int(tcp, addr, "%d");
 816                 } else {
 817                         printstrn(tcp, addr, rlen);
 818                 }
 819         } else {
 820                 printaddr(addr);
 821         }
 822 }
 823
 824 SYS_FUNC(getsockopt)
 825 {
 826         int ulen, rlen;
 827
 828         if (entering(tcp)) {
 829                 print_sockopt_fd_level_name(tcp, tcp->u_arg[0],
 830                                             tcp->u_arg[1], tcp->u_arg[2], true);
 831
 832                 if (verbose(tcp) && tcp->u_arg[4]
 833                     && umove(tcp, tcp->u_arg[4], &ulen) == 0) {
 834                         set_tcb_priv_ulong(tcp, ulen);
 835                         return 0;
 836                 } else {
 837                         printaddr(tcp->u_arg[3]);
 838                         tprints(", ");
 839                         printaddr(tcp->u_arg[4]);
 840                         return RVAL_DECODED;
 841                 }
 842         } else {
 843                 ulen = get_tcb_priv_ulong(tcp);
 844
 845                 if (syserror(tcp) || umove(tcp, tcp->u_arg[4], &rlen) < 0) {
 846                         printaddr(tcp->u_arg[3]);
 847                         tprintf(", [%d]", ulen);
 848                 } else {
 849                         print_getsockopt(tcp, tcp->u_arg[1], tcp->u_arg[2],
 850                                          tcp->u_arg[3], ulen, rlen);
 851                         if (ulen != rlen)
 852                                 tprintf(", [%d->%d]", ulen, rlen);
 853                         else
 854                                 tprintf(", [%d]", rlen);
 855                 }
 856         }
 857         return 0;
 858 }
 859
 860 static void
 861 print_set_linger(struct tcb *const tcp, const kernel_ulong_t addr,
 862                  const int len)
 863 {
 864         struct linger linger;
 865
 866         if (len < (int) sizeof(linger)) {
 867                 printaddr(addr);
 868         } else if (!umove_or_printaddr(tcp, addr, &linger)) {
 869                 PRINT_FIELD_D("{", linger, l_onoff);
 870                 PRINT_FIELD_D(", ", linger, l_linger);
 871                 tprints("}");
 872         }
 873 }
 874
 875 #ifdef IP_ADD_MEMBERSHIP
 876 static void
 877 print_mreq(struct tcb *const tcp, const kernel_ulong_t addr,
 878            const int len)
 879 {
 880         struct ip_mreq mreq;
 881
 882         if (len < (int) sizeof(mreq)) {
 883                 printaddr(addr);
 884         } else if (!umove_or_printaddr(tcp, addr, &mreq)) {
 885                 PRINT_FIELD_INET4_ADDR("{", mreq, imr_multiaddr);
 886                 PRINT_FIELD_INET4_ADDR(", ", mreq, imr_interface);
 887                 tprints("}");
 888         }
 889 }
 890 #endif /* IP_ADD_MEMBERSHIP */
 891
 892 #ifdef IPV6_ADD_MEMBERSHIP
 893 static void
 894 print_mreq6(struct tcb *const tcp, const kernel_ulong_t addr,
 895             const int len)
 896 {
 897         struct ipv6_mreq mreq;
 898
 899         if (len < (int) sizeof(mreq)) {
 900                 printaddr(addr);
 901         } else if (!umove_or_printaddr(tcp, addr, &mreq)) {
 902                 PRINT_FIELD_INET_ADDR("{", mreq, ipv6mr_multiaddr, AF_INET6);
 903                 PRINT_FIELD_IFINDEX(", ", mreq, ipv6mr_interface);
 904                 tprints("}");
 905         }
 906 }
 907 #endif /* IPV6_ADD_MEMBERSHIP */
 908
 909 #ifdef PACKET_RX_RING
 910 static void
 911 print_tpacket_req(struct tcb *const tcp, const kernel_ulong_t addr, const int len)
 912 {
 913         struct tpacket_req req;
 914
 915         if (len != sizeof(req) ||
 916             umove(tcp, addr, &req) < 0) {
 917                 printaddr(addr);
 918         } else {
 919                 PRINT_FIELD_U("{", req, tp_block_size);
 920                 PRINT_FIELD_U(", ", req, tp_block_nr);
 921                 PRINT_FIELD_U(", ", req, tp_frame_size);
 922                 PRINT_FIELD_U(", ", req, tp_frame_nr);
 923                 tprints("}");
 924         }
 925 }
 926 #endif /* PACKET_RX_RING */
 927
 928 #ifdef PACKET_ADD_MEMBERSHIP
 929 # include "xlat/packet_mreq_type.h"
 930
 931 static void
 932 print_packet_mreq(struct tcb *const tcp, const kernel_ulong_t addr, const int len)
 933 {
 934         struct packet_mreq mreq;
 935
 936         if (len != sizeof(mreq) ||
 937             umove(tcp, addr, &mreq) < 0) {
 938                 printaddr(addr);
 939         } else {
 940                 unsigned int i;
 941
 942                 PRINT_FIELD_IFINDEX("{", mreq, mr_ifindex);
 943                 PRINT_FIELD_XVAL(", ", mreq, mr_type, packet_mreq_type,
 944                                  "PACKET_MR_???");
 945                 PRINT_FIELD_U(", ", mreq, mr_alen);
 946                 tprints(", mr_address=");
 947                 if (mreq.mr_alen > ARRAY_SIZE(mreq.mr_address))
 948                         mreq.mr_alen = ARRAY_SIZE(mreq.mr_address);
 949                 for (i = 0; i < mreq.mr_alen; ++i)
 950                         tprintf("%02x", mreq.mr_address[i]);
 951                 tprints("}");
 952         }
 953 }
 954 #endif /* PACKET_ADD_MEMBERSHIP */
 955
 956 static void
 957 print_setsockopt(struct tcb *const tcp, const unsigned int level,
 958                  const unsigned int name, const kernel_ulong_t addr,
 959                  const int len)
 960 {
 961         if (addr && verbose(tcp))
 962         switch (level) {
 963         case SOL_SOCKET:
 964                 switch (name) {
 965                 case SO_LINGER:
 966                         print_set_linger(tcp, addr, len);
 967                         return;
 968                 case SO_ATTACH_FILTER:
 969                 case SO_ATTACH_REUSEPORT_CBPF:
 970                         if ((unsigned int) len == get_sock_fprog_size())
 971                                 decode_sock_fprog(tcp, addr);
 972                         else
 973                                 printaddr(addr);
 974                         return;
 975                 }
 976                 break;
 977
 978         case SOL_IP:
 979                 switch (name) {
 980 #ifdef IP_ADD_MEMBERSHIP
 981                 case IP_ADD_MEMBERSHIP:
 982                 case IP_DROP_MEMBERSHIP:
 983                         print_mreq(tcp, addr, len);
 984                         return;
 985 #endif /* IP_ADD_MEMBERSHIP */
 986 #ifdef MCAST_JOIN_GROUP
 987                 case MCAST_JOIN_GROUP:
 988                 case MCAST_LEAVE_GROUP:
 989                         print_group_req(tcp, addr, len);
 990                         return;
 991 #endif /* MCAST_JOIN_GROUP */
 992                 }
 993                 break;
 994
 995         case SOL_IPV6:
 996                 switch (name) {
 997 #ifdef IPV6_ADD_MEMBERSHIP
 998                 case IPV6_ADD_MEMBERSHIP:
 999                 case IPV6_DROP_MEMBERSHIP:
1000 # ifdef IPV6_JOIN_ANYCAST
1001                 case IPV6_JOIN_ANYCAST:
1002 # endif
1003 # ifdef IPV6_LEAVE_ANYCAST
1004                 case IPV6_LEAVE_ANYCAST:
1005 # endif
1006                         print_mreq6(tcp, addr, len);
1007                         return;
1008 #endif /* IPV6_ADD_MEMBERSHIP */
1009 #ifdef MCAST_JOIN_GROUP
1010                 case MCAST_JOIN_GROUP:
1011                 case MCAST_LEAVE_GROUP:
1012                         print_group_req(tcp, addr, len);
1013                         return;
1014 #endif /* MCAST_JOIN_GROUP */
1015                 }
1016                 break;
1017
1018         case SOL_PACKET:
1019                 switch (name) {
1020 #ifdef PACKET_RX_RING
1021                 case PACKET_RX_RING:
1022 # ifdef PACKET_TX_RING
1023                 case PACKET_TX_RING:
1024 # endif
1025                         print_tpacket_req(tcp, addr, len);
1026                         return;
1027 #endif /* PACKET_RX_RING */
1028 #ifdef PACKET_ADD_MEMBERSHIP
1029                 case PACKET_ADD_MEMBERSHIP:
1030                 case PACKET_DROP_MEMBERSHIP:
1031                         print_packet_mreq(tcp, addr, len);
1032                         return;
1033 #endif /* PACKET_ADD_MEMBERSHIP */
1034                 }
1035                 break;
1036
1037         case SOL_RAW:
1038                 switch (name) {
1039                 case ICMP_FILTER:
1040                         print_icmp_filter(tcp, addr, len);
1041                         return;
1042                 }
1043                 break;
1044
1045         case SOL_NETLINK:
1046                 if (len < (int) sizeof(int))
1047                         printaddr(addr);
1048                 else
1049                         printnum_int(tcp, addr, "%d");
1050                 return;
1051         }
1052
1053         /* default arg printing */
1054
1055         if (verbose(tcp)) {
1056                 if (len == sizeof(int)) {
1057                         printnum_int(tcp, addr, "%d");
1058                 } else {
1059                         printstrn(tcp, addr, len);
1060                 }
1061         } else {
1062                 printaddr(addr);
1063         }
1064 }
1065
1066 SYS_FUNC(setsockopt)
1067 {
1068         print_sockopt_fd_level_name(tcp, tcp->u_arg[0],
1069                                     tcp->u_arg[1], tcp->u_arg[2], false);
1070         print_setsockopt(tcp, tcp->u_arg[1], tcp->u_arg[2],
1071                          tcp->u_arg[3], tcp->u_arg[4]);
1072         tprintf(", %d", (int) tcp->u_arg[4]);
1073
1074         return RVAL_DECODED;
1075 }