usr.bin/sockstat/sockstat.c

   1 /*-
   2  * Copyright (c) 2005 Joerg Sonnenberger <joerg@bec.de>.  All rights reserved.
   3  * Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
   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  *    in this position and unchanged.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/usr.bin/sockstat/sockstat.c,v 1.12 2004/12/06 09:28:05 ru Exp $
  30  * $DragonFly: src/usr.bin/sockstat/sockstat.c,v 1.7 2007/02/01 10:33:26 corecode Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/socketvar.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/file.h>
  38 #include <sys/user.h>
  39
  40 #include <sys/un.h>
  41 #include <sys/unpcb.h>
  42
  43 #include <net/route.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/in_pcb.h>
  47 #include <netinet/tcp.h>
  48 #include <netinet/tcp_seq.h>
  49 #include <netinet/tcp_var.h>
  50 #include <arpa/inet.h>
  51
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <kinfo.h>
  56 #include <netdb.h>
  57 #include <pwd.h>
  58 #include <stdarg.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 static int       opt_4;         /* Show IPv4 sockets */
  65 static int       opt_6;         /* Show IPv6 sockets */
  66 static int       opt_c;         /* Show connected sockets */
  67 static int       opt_l;         /* Show listening sockets */
  68 static int       opt_u;         /* Show Unix domain sockets */
  69 static int       opt_v;         /* Verbose mode */
  70
  71 static int      *ports;
  72
  73 #define INT_BIT (sizeof(int)*CHAR_BIT)
  74 #define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
  75 #define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
  76
  77 struct sock {
  78         void *socket;
  79         void *pcb;
  80         int vflag;
  81         int family;
  82         int proto;
  83         const char *protoname;
  84         struct sockaddr_storage laddr;
  85         struct sockaddr_storage faddr;
  86         struct sock *next;
  87 };
  88
  89 #define HASHSIZE 1009
  90 static struct sock *sockhash[HASHSIZE];
  91
  92 static struct kinfo_file *xfiles;
  93 static int nxfiles;
  94
  95 static int
  96 xprintf(const char *fmt, ...)
  97 {
  98         va_list ap;
  99         int len;
 100
 101         va_start(ap, fmt);
 102         len = vprintf(fmt, ap);
 103         va_end(ap);
 104         if (len < 0)
 105                 err(1, "printf()");
 106         return (len);
 107 }
 108
 109 static void
 110 parse_ports(const char *portspec)
 111 {
 112         const char *p, *q;
 113         int port, end;
 114
 115         if (ports == NULL)
 116                 if ((ports = calloc(65536 / INT_BIT, sizeof(int))) == NULL)
 117                         err(1, "calloc()");
 118         p = portspec;
 119         while (*p != '\0') {
 120                 if (!isdigit(*p))
 121                         errx(1, "syntax error in port range");
 122                 for (q = p; *q != '\0' && isdigit(*q); ++q)
 123                         /* nothing */ ;
 124                 for (port = 0; p < q; ++p)
 125                         port = port * 10 + (*p - '0');
 126                 if (port < 0 || port > 65535)
 127                         errx(1, "invalid port number");
 128                 SET_PORT(port);
 129                 switch (*p) {
 130                 case '-':
 131                         ++p;
 132                         break;
 133                 case ',':
 134                         ++p;
 135                         /* fall through */
 136                 case '\0':
 137                 default:
 138                         continue;
 139                 }
 140                 for (q = p; *q != '\0' && isdigit(*q); ++q)
 141                         /* nothing */ ;
 142                 for (end = 0; p < q; ++p)
 143                         end = end * 10 + (*p - '0');
 144                 if (end < port || end > 65535)
 145                         errx(1, "invalid port number");
 146                 while (port++ < end)
 147                         SET_PORT(port);
 148                 if (*p == ',')
 149                         ++p;
 150         }
 151 }
 152
 153 static void
 154 sockaddr(struct sockaddr_storage *sa, int af, void *addr, int port)
 155 {
 156         struct sockaddr_in *sin4;
 157         struct sockaddr_in6 *sin6;
 158
 159         bzero(sa, sizeof *sa);
 160         switch (af) {
 161         case AF_INET:
 162                 sin4 = (struct sockaddr_in *)sa;
 163                 sin4->sin_len = sizeof *sin4;
 164                 sin4->sin_family = af;
 165                 sin4->sin_port = port;
 166                 sin4->sin_addr = *(struct in_addr *)addr;
 167                 break;
 168         case AF_INET6:
 169                 sin6 = (struct sockaddr_in6 *)sa;
 170                 sin6->sin6_len = sizeof *sin6;
 171                 sin6->sin6_family = af;
 172                 sin6->sin6_port = port;
 173                 sin6->sin6_addr = *(struct in6_addr *)addr;
 174                 break;
 175         default:
 176                 abort();
 177         }
 178 }
 179
 180 static void
 181 gather_inet(int proto)
 182 {
 183         void *so_begin, *so_end;
 184         struct xinpcb *xip;
 185         struct xtcpcb *xtp;
 186         struct inpcb *inp;
 187         struct xsocket *so;
 188         struct sock *sock;
 189         const char *varname, *protoname;
 190         size_t len;
 191         void *buf;
 192         int hash, vflag;
 193
 194         vflag = 0;
 195         if (opt_4)
 196                 vflag |= INP_IPV4;
 197         if (opt_6)
 198                 vflag |= INP_IPV6;
 199
 200         switch (proto) {
 201         case IPPROTO_TCP:
 202                 varname = "net.inet.tcp.pcblist";
 203                 protoname = "tcp";
 204                 break;
 205         case IPPROTO_UDP:
 206                 varname = "net.inet.udp.pcblist";
 207                 protoname = "udp";
 208                 break;
 209         case IPPROTO_DIVERT:
 210                 varname = "net.inet.divert.pcblist";
 211                 protoname = "div";
 212                 break;
 213         default:
 214                 abort();
 215         }
 216
 217         buf = NULL;
 218         len = 0;
 219
 220         if (sysctlbyname(varname, NULL, &len, NULL, 0)) {
 221                 if (errno == ENOENT)
 222                         goto out;
 223                 err(1, "fetching %s", varname);
 224         }
 225         if ((buf = malloc(len)) == NULL)
 226                 err(1, "malloc()");
 227         if (sysctlbyname(varname, buf, &len, NULL, 0)) {
 228                 if (errno == ENOENT)
 229                         goto out;
 230                 err(1, "fetching %s", varname);
 231         }
 232
 233         so_begin = buf;
 234         so_end = (uint8_t *)buf + len;
 235
 236         for (so_begin = buf, so_end = (uint8_t *)so_begin + len;
 237              (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
 238              (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
 239              so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
 240                 switch (proto) {
 241                 case IPPROTO_TCP:
 242                         xtp = (struct xtcpcb *)so_begin;
 243                         if (xtp->xt_len != sizeof *xtp) {
 244                                 warnx("struct xtcpcb size mismatch");
 245                                 goto out;
 246                         }
 247                         inp = &xtp->xt_inp;
 248                         so = &xtp->xt_socket;
 249                         break;
 250                 case IPPROTO_UDP:
 251                 case IPPROTO_DIVERT:
 252                         xip = (struct xinpcb *)so_begin;
 253                         if (xip->xi_len != sizeof *xip) {
 254                                 warnx("struct xinpcb size mismatch");
 255                                 goto out;
 256                         }
 257                         inp = &xip->xi_inp;
 258                         so = &xip->xi_socket;
 259                         break;
 260                 default:
 261                         abort();
 262                 }
 263                 if ((inp->inp_vflag & vflag) == 0)
 264                         continue;
 265                 if (inp->inp_vflag & INP_IPV4) {
 266                         if ((inp->inp_fport == 0 && !opt_l) ||
 267                             (inp->inp_fport != 0 && !opt_c))
 268                                 continue;
 269                 } else if (inp->inp_vflag & INP_IPV6) {
 270                         if ((inp->in6p_fport == 0 && !opt_l) ||
 271                             (inp->in6p_fport != 0 && !opt_c))
 272                                 continue;
 273                 } else {
 274                         if (opt_v)
 275                                 warnx("invalid vflag 0x%x", inp->inp_vflag);
 276                         continue;
 277                 }
 278                 if ((sock = calloc(1, sizeof *sock)) == NULL)
 279                         err(1, "malloc()");
 280                 sock->socket = so->xso_so;
 281                 sock->proto = proto;
 282                 if (inp->inp_vflag & INP_IPV4) {
 283                         sock->family = AF_INET;
 284                         sockaddr(&sock->laddr, sock->family,
 285                             &inp->inp_laddr, inp->inp_lport);
 286                         sockaddr(&sock->faddr, sock->family,
 287                             &inp->inp_faddr, inp->inp_fport);
 288                 } else if (inp->inp_vflag & INP_IPV6) {
 289                         sock->family = AF_INET6;
 290                         sockaddr(&sock->laddr, sock->family,
 291                             &inp->in6p_laddr, inp->in6p_lport);
 292                         sockaddr(&sock->faddr, sock->family,
 293                             &inp->in6p_faddr, inp->in6p_fport);
 294                 }
 295                 sock->vflag = inp->inp_vflag;
 296                 sock->protoname = protoname;
 297                 hash = (int)((uintptr_t)sock->socket % HASHSIZE);
 298                 sock->next = sockhash[hash];
 299                 sockhash[hash] = sock;
 300         }
 301 out:
 302         free(buf);
 303 }
 304
 305 static void
 306 gather_unix(int proto)
 307 {
 308         void *so_begin, *so_end;
 309         struct xunpcb *xup;
 310         struct sock *sock;
 311         const char *varname, *protoname;
 312         size_t len;
 313         void *buf;
 314         int hash;
 315
 316         switch (proto) {
 317         case SOCK_STREAM:
 318                 varname = "net.local.stream.pcblist";
 319                 protoname = "stream";
 320                 break;
 321         case SOCK_DGRAM:
 322                 varname = "net.local.dgram.pcblist";
 323                 protoname = "dgram";
 324                 break;
 325         default:
 326                 abort();
 327         }
 328
 329         buf = NULL;
 330         len = 0;
 331
 332         if (sysctlbyname(varname, NULL, &len, NULL, 0))
 333                 err(1, "fetching %s", varname);
 334
 335         if ((buf = malloc(len)) == NULL)
 336                 err(1, "malloc()");
 337         if (sysctlbyname(varname, buf, &len, NULL, 0))
 338                 err(1, "fetching %s", varname);
 339
 340         for (so_begin = buf, so_end = (uint8_t *)buf + len;
 341              (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
 342              (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
 343              so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
 344                 xup = so_begin;
 345                 if (xup->xu_len != sizeof *xup) {
 346                         warnx("struct xunpcb size mismatch");
 347                         goto out;
 348                 }
 349                 if ((xup->xu_unp.unp_conn == NULL && !opt_l) ||
 350                     (xup->xu_unp.unp_conn != NULL && !opt_c))
 351                         continue;
 352                 if ((sock = calloc(1, sizeof *sock)) == NULL)
 353                         err(1, "malloc()");
 354                 sock->socket = xup->xu_socket.xso_so;
 355                 sock->pcb = xup->xu_unpp;
 356                 sock->proto = proto;
 357                 sock->family = AF_UNIX;
 358                 sock->protoname = protoname;
 359                 if (xup->xu_unp.unp_addr != NULL)
 360                         sock->laddr =
 361                             *(struct sockaddr_storage *)(void *)&xup->xu_addr;
 362                 else if (xup->xu_unp.unp_conn != NULL)
 363                         *(void **)&sock->faddr = xup->xu_unp.unp_conn;
 364                 hash = (int)((uintptr_t)sock->socket % HASHSIZE);
 365                 sock->next = sockhash[hash];
 366                 sockhash[hash] = sock;
 367         }
 368 out:
 369         free(buf);
 370 }
 371
 372 static void
 373 getfiles(void)
 374 {
 375         if (kinfo_get_files(&xfiles, &nxfiles))
 376                 err(1, "kinfo_get_files");
 377 }
 378
 379 static int
 380 printaddr(int af, struct sockaddr_storage *ss)
 381 {
 382         char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
 383         struct sockaddr_un *sun;
 384         void *addr;
 385         int off, port;
 386
 387         switch (af) {
 388         case AF_INET:
 389                 addr = &((struct sockaddr_in *)ss)->sin_addr;
 390                 if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
 391                         addrstr[0] = '*';
 392                 port = ntohs(((struct sockaddr_in *)ss)->sin_port);
 393                 break;
 394         case AF_INET6:
 395                 addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
 396                 if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
 397                         addrstr[0] = '*';
 398                 port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
 399                 break;
 400         case AF_UNIX:
 401                 sun = (struct sockaddr_un *)ss;
 402                 off = (int)((char *)&sun->sun_path - (char *)sun);
 403                 return (xprintf("%.*s", sun->sun_len - off, sun->sun_path));
 404         default:
 405                 abort();
 406         }
 407         if (addrstr[0] == '\0')
 408                 inet_ntop(af, addr, addrstr, sizeof addrstr);
 409         if (port == 0)
 410                 return xprintf("%s:*", addrstr);
 411         else
 412                 return xprintf("%s:%d", addrstr, port);
 413 }
 414
 415 static const char *
 416 getprocname(pid_t pid)
 417 {
 418         static struct kinfo_proc proc;
 419         size_t len;
 420         int mib[4];
 421
 422         mib[0] = CTL_KERN;
 423         mib[1] = KERN_PROC;
 424         mib[2] = KERN_PROC_PID;
 425         mib[3] = (int)pid;
 426         len = sizeof proc;
 427         if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
 428                 warn("sysctl()");
 429                 return ("??");
 430         }
 431         return (proc.kp_comm);
 432 }
 433
 434 static int
 435 check_ports(struct sock *s)
 436 {
 437         int port;
 438
 439         if (ports == NULL)
 440                 return (1);
 441         if ((s->family != AF_INET) && (s->family != AF_INET6))
 442                 return (1);
 443         if (s->family == AF_INET)
 444                 port = ntohs(((struct sockaddr_in *)(&s->laddr))->sin_port);
 445         else
 446                 port = ntohs(((struct sockaddr_in6 *)(&s->laddr))->sin6_port);
 447         if (CHK_PORT(port))
 448                 return (1);
 449         if (s->family == AF_INET)
 450                 port = ntohs(((struct sockaddr_in *)(&s->faddr))->sin_port);
 451         else
 452                 port = ntohs(((struct sockaddr_in6 *)(&s->faddr))->sin6_port);
 453         if (CHK_PORT(port))
 454                 return (1);
 455         return (0);
 456 }
 457
 458 static void
 459 display(void)
 460 {
 461         struct passwd *pwd;
 462         struct kinfo_file *xf;
 463         struct sock *s;
 464         void *p;
 465         int hash, n, pos;
 466
 467         printf("%-8s %-10s %-5s %-2s %-6s %-21s %-21s\n",
 468             "USER", "COMMAND", "PID", "FD", "PROTO",
 469             "LOCAL ADDRESS", "FOREIGN ADDRESS");
 470         setpassent(1);
 471         for (xf = xfiles, n = 0; n < nxfiles; ++n, ++xf) {
 472                 if (xf->f_data == NULL)
 473                         continue;
 474                 hash = (int)((uintptr_t)xf->f_data % HASHSIZE);
 475                 for (s = sockhash[hash]; s != NULL; s = s->next)
 476                         if ((void *)s->socket == xf->f_data)
 477                                 break;
 478                 if (s == NULL)
 479                         continue;
 480                 if (!check_ports(s))
 481                         continue;
 482                 pos = 0;
 483                 if ((pwd = getpwuid(xf->f_uid)) == NULL)
 484                         pos += xprintf("%lu", (u_long)xf->f_uid);
 485                 else
 486                         pos += xprintf("%s", pwd->pw_name);
 487                 while (pos < 9)
 488                         pos += xprintf(" ");
 489                 pos += xprintf("%.10s", getprocname(xf->f_pid));
 490                 while (pos < 20)
 491                         pos += xprintf(" ");
 492                 pos += xprintf("%lu", (u_long)xf->f_pid);
 493                 while (pos < 26)
 494                         pos += xprintf(" ");
 495                 pos += xprintf("%d", xf->f_fd);
 496                 while (pos < 29)
 497                         pos += xprintf(" ");
 498                 pos += xprintf("%s", s->protoname);
 499                 if (s->vflag & INP_IPV4)
 500                         pos += xprintf("4");
 501                 if (s->vflag & INP_IPV6)
 502                         pos += xprintf("6");
 503                 while (pos < 36)
 504                         pos += xprintf(" ");
 505                 switch (s->family) {
 506                 case AF_INET:
 507                 case AF_INET6:
 508                         pos += printaddr(s->family, &s->laddr);
 509                         while (pos < 57)
 510                                 pos += xprintf(" ");
 511                         pos += xprintf(" ");
 512                         pos += printaddr(s->family, &s->faddr);
 513                         break;
 514                 case AF_UNIX:
 515                         /* server */
 516                         if (s->laddr.ss_len > 0) {
 517                                 pos += printaddr(s->family, &s->laddr);
 518                                 break;
 519                         }
 520                         /* client */
 521                         p = *(void **)&s->faddr;
 522                         if (p == NULL) {
 523                                 pos += xprintf("(not connected)");
 524                                 break;
 525                         }
 526                         pos += xprintf("-> ");
 527                         for (hash = 0; hash < HASHSIZE; ++hash) {
 528                                 for (s = sockhash[hash]; s != NULL; s = s->next)
 529                                         if (s->pcb == p)
 530                                                 break;
 531                                 if (s != NULL)
 532                                         break;
 533                         }
 534                         if (s == NULL || s->laddr.ss_len == 0)
 535                                 pos += xprintf("??");
 536                         else
 537                                 pos += printaddr(s->family, &s->laddr);
 538                         break;
 539                 default:
 540                         abort();
 541                 }
 542                 xprintf("\n");
 543         }
 544 }
 545
 546 static void
 547 usage(void)
 548 {
 549         fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
 550         exit(1);
 551 }
 552
 553 int
 554 main(int argc, char *argv[])
 555 {
 556         int o;
 557
 558         while ((o = getopt(argc, argv, "46clp:uv")) != -1)
 559                 switch (o) {
 560                 case '4':
 561                         opt_4 = 1;
 562                         break;
 563                 case '6':
 564                         opt_6 = 1;
 565                         break;
 566                 case 'c':
 567                         opt_c = 1;
 568                         break;
 569                 case 'l':
 570                         opt_l = 1;
 571                         break;
 572                 case 'p':
 573                         parse_ports(optarg);
 574                         break;
 575                 case 'u':
 576                         opt_u = 1;
 577                         break;
 578                 case 'v':
 579                         ++opt_v;
 580                         break;
 581                 default:
 582                         usage();
 583                 }
 584
 585         argc -= optind;
 586         argv += optind;
 587
 588         if (argc > 0)
 589                 usage();
 590
 591         if (!opt_4 && !opt_6 && !opt_u)
 592                 opt_4 = opt_6 = opt_u = 1;
 593         if (!opt_c && !opt_l)
 594                 opt_c = opt_l = 1;
 595
 596         if (opt_4 || opt_6) {
 597                 gather_inet(IPPROTO_TCP);
 598                 gather_inet(IPPROTO_UDP);
 599                 gather_inet(IPPROTO_DIVERT);
 600         }
 601         if (opt_u) {
 602                 gather_unix(SOCK_STREAM);
 603                 gather_unix(SOCK_DGRAM);
 604         }
 605         getfiles();
 606         display();
 607
 608         exit(0);
 609 }