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 #define _KERNEL_STRUCTURES
  34 #include <sys/param.h>
  35 #include <sys/socket.h>
  36 #include <sys/socketvar.h>
  37 #include <sys/sysctl.h>
  38 #include <sys/file.h>
  39 #include <sys/user.h>
  40
  41 #include <sys/un.h>
  42 #include <sys/unpcb.h>
  43
  44 #include <net/route.h>
  45
  46 #include <netinet/in.h>
  47 #include <netinet/in_pcb.h>
  48 #include <netinet/tcp.h>
  49 #include <netinet/tcp_seq.h>
  50 #include <netinet/tcp_var.h>
  51 #include <arpa/inet.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <kinfo.h>
  57 #include <netdb.h>
  58 #include <pwd.h>
  59 #include <stdarg.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 static int       opt_4;         /* Show IPv4 sockets */
  66 static int       opt_6;         /* Show IPv6 sockets */
  67 static int       opt_c;         /* Show connected sockets */
  68 static int       opt_l;         /* Show listening sockets */
  69 static int       opt_u;         /* Show Unix domain sockets */
  70 static int       opt_v;         /* Verbose mode */
  71
  72 static int      *ports;
  73
  74 #define INT_BIT (sizeof(int)*CHAR_BIT)
  75 #define SET_PORT(p) do { ports[p / INT_BIT] |= 1 << (p % INT_BIT); } while (0)
  76 #define CHK_PORT(p) (ports[p / INT_BIT] & (1 << (p % INT_BIT)))
  77
  78 struct sock {
  79         void *socket;
  80         void *pcb;
  81         int vflag;
  82         int family;
  83         int proto;
  84         const char *protoname;
  85         struct sockaddr_storage laddr;
  86         struct sockaddr_storage faddr;
  87         struct sock *next;
  88 };
  89
  90 #define HASHSIZE 1009
  91 static struct sock *sockhash[HASHSIZE];
  92
  93 static struct kinfo_file *xfiles;
  94 static size_t nxfiles;
  95
  96 static int
  97 xprintf(const char *fmt, ...)
  98 {
  99         va_list ap;
 100         int len;
 101
 102         va_start(ap, fmt);
 103         len = vprintf(fmt, ap);
 104         va_end(ap);
 105         if (len < 0)
 106                 err(1, "printf()");
 107         return (len);
 108 }
 109
 110 static void
 111 parse_ports(const char *portspec)
 112 {
 113         const char *p, *q;
 114         int port, end;
 115
 116         if (ports == NULL)
 117                 if ((ports = calloc(65536 / INT_BIT, sizeof(int))) == NULL)
 118                         err(1, "calloc()");
 119         p = portspec;
 120         while (*p != '\0') {
 121                 if (!isdigit(*p))
 122                         errx(1, "syntax error in port range");
 123                 for (q = p; *q != '\0' && isdigit(*q); ++q)
 124                         /* nothing */ ;
 125                 for (port = 0; p < q; ++p)
 126                         port = port * 10 + (*p - '0');
 127                 if (port < 0 || port > 65535)
 128                         errx(1, "invalid port number");
 129                 SET_PORT(port);
 130                 switch (*p) {
 131                 case '-':
 132                         ++p;
 133                         break;
 134                 case ',':
 135                         ++p;
 136                         /* fall through */
 137                 case '\0':
 138                 default:
 139                         continue;
 140                 }
 141                 for (q = p; *q != '\0' && isdigit(*q); ++q)
 142                         /* nothing */ ;
 143                 for (end = 0; p < q; ++p)
 144                         end = end * 10 + (*p - '0');
 145                 if (end < port || end > 65535)
 146                         errx(1, "invalid port number");
 147                 while (port++ < end)
 148                         SET_PORT(port);
 149                 if (*p == ',')
 150                         ++p;
 151         }
 152 }
 153
 154 static void
 155 sockaddr(struct sockaddr_storage *sa, int af, void *addr, int port)
 156 {
 157         struct sockaddr_in *sin4;
 158         struct sockaddr_in6 *sin6;
 159
 160         bzero(sa, sizeof *sa);
 161         switch (af) {
 162         case AF_INET:
 163                 sin4 = (struct sockaddr_in *)sa;
 164                 sin4->sin_len = sizeof *sin4;
 165                 sin4->sin_family = af;
 166                 sin4->sin_port = port;
 167                 sin4->sin_addr = *(struct in_addr *)addr;
 168                 break;
 169         case AF_INET6:
 170                 sin6 = (struct sockaddr_in6 *)sa;
 171                 sin6->sin6_len = sizeof *sin6;
 172                 sin6->sin6_family = af;
 173                 sin6->sin6_port = port;
 174                 sin6->sin6_addr = *(struct in6_addr *)addr;
 175                 break;
 176         default:
 177                 abort();
 178         }
 179 }
 180
 181 static void
 182 gather_inet(int proto)
 183 {
 184         void *so_begin, *so_end;
 185         struct xinpcb *xip;
 186         struct xtcpcb *xtp;
 187         struct inpcb *inp;
 188         struct xsocket *so;
 189         struct sock *sock;
 190         const char *varname, *protoname;
 191         size_t len;
 192         void *buf;
 193         int hash, vflag;
 194
 195         vflag = 0;
 196         if (opt_4)
 197                 vflag |= INP_IPV4;
 198         if (opt_6)
 199                 vflag |= INP_IPV6;
 200
 201         switch (proto) {
 202         case IPPROTO_TCP:
 203                 varname = "net.inet.tcp.pcblist";
 204                 protoname = "tcp";
 205                 break;
 206         case IPPROTO_UDP:
 207                 varname = "net.inet.udp.pcblist";
 208                 protoname = "udp";
 209                 break;
 210         case IPPROTO_DIVERT:
 211                 varname = "net.inet.divert.pcblist";
 212                 protoname = "div";
 213                 break;
 214         default:
 215                 abort();
 216         }
 217
 218         buf = NULL;
 219         len = 0;
 220
 221         if (sysctlbyname(varname, NULL, &len, NULL, 0)) {
 222                 if (errno == ENOENT)
 223                         goto out;
 224                 err(1, "fetching %s", varname);
 225         }
 226         if ((buf = malloc(len)) == NULL)
 227                 err(1, "malloc()");
 228         if (sysctlbyname(varname, buf, &len, NULL, 0)) {
 229                 if (errno == ENOENT)
 230                         goto out;
 231                 err(1, "fetching %s", varname);
 232         }
 233
 234         so_begin = buf;
 235         so_end = (uint8_t *)buf + len;
 236
 237         for (so_begin = buf, so_end = (uint8_t *)so_begin + len;
 238              (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
 239              (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
 240              so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
 241                 switch (proto) {
 242                 case IPPROTO_TCP:
 243                         xtp = (struct xtcpcb *)so_begin;
 244                         if (xtp->xt_len != sizeof *xtp) {
 245                                 warnx("struct xtcpcb size mismatch");
 246                                 goto out;
 247                         }
 248                         inp = &xtp->xt_inp;
 249                         so = &xtp->xt_socket;
 250                         break;
 251                 case IPPROTO_UDP:
 252                 case IPPROTO_DIVERT:
 253                         xip = (struct xinpcb *)so_begin;
 254                         if (xip->xi_len != sizeof *xip) {
 255                                 warnx("struct xinpcb size mismatch");
 256                                 goto out;
 257                         }
 258                         inp = &xip->xi_inp;
 259                         so = &xip->xi_socket;
 260                         break;
 261                 default:
 262                         abort();
 263                 }
 264                 if ((inp->inp_vflag & vflag) == 0)
 265                         continue;
 266                 if (inp->inp_vflag & INP_IPV4) {
 267                         if ((inp->inp_fport == 0 && !opt_l) ||
 268                             (inp->inp_fport != 0 && !opt_c))
 269                                 continue;
 270                 } else if (inp->inp_vflag & INP_IPV6) {
 271                         if ((inp->in6p_fport == 0 && !opt_l) ||
 272                             (inp->in6p_fport != 0 && !opt_c))
 273                                 continue;
 274                 } else {
 275                         if (opt_v)
 276                                 warnx("invalid vflag 0x%x", inp->inp_vflag);
 277                         continue;
 278                 }
 279                 if ((sock = calloc(1, sizeof *sock)) == NULL)
 280                         err(1, "malloc()");
 281                 sock->socket = so->xso_so;
 282                 sock->proto = proto;
 283                 if (inp->inp_vflag & INP_IPV4) {
 284                         sock->family = AF_INET;
 285                         sockaddr(&sock->laddr, sock->family,
 286                             &inp->inp_laddr, inp->inp_lport);
 287                         sockaddr(&sock->faddr, sock->family,
 288                             &inp->inp_faddr, inp->inp_fport);
 289                 } else if (inp->inp_vflag & INP_IPV6) {
 290                         sock->family = AF_INET6;
 291                         sockaddr(&sock->laddr, sock->family,
 292                             &inp->in6p_laddr, inp->in6p_lport);
 293                         sockaddr(&sock->faddr, sock->family,
 294                             &inp->in6p_faddr, inp->in6p_fport);
 295                 }
 296                 sock->vflag = inp->inp_vflag;
 297                 sock->protoname = protoname;
 298                 hash = (int)((uintptr_t)sock->socket % HASHSIZE);
 299                 sock->next = sockhash[hash];
 300                 sockhash[hash] = sock;
 301         }
 302 out:
 303         free(buf);
 304 }
 305
 306 static void
 307 gather_unix(int proto)
 308 {
 309         void *so_begin, *so_end;
 310         struct xunpcb *xup;
 311         struct sock *sock;
 312         const char *varname, *protoname;
 313         size_t len;
 314         void *buf;
 315         int hash;
 316
 317         switch (proto) {
 318         case SOCK_STREAM:
 319                 varname = "net.local.stream.pcblist";
 320                 protoname = "stream";
 321                 break;
 322         case SOCK_DGRAM:
 323                 varname = "net.local.dgram.pcblist";
 324                 protoname = "dgram";
 325                 break;
 326         default:
 327                 abort();
 328         }
 329
 330         buf = NULL;
 331         len = 0;
 332
 333         if (sysctlbyname(varname, NULL, &len, NULL, 0))
 334                 err(1, "fetching %s", varname);
 335
 336         if ((buf = malloc(len)) == NULL)
 337                 err(1, "malloc()");
 338         if (sysctlbyname(varname, buf, &len, NULL, 0))
 339                 err(1, "fetching %s", varname);
 340
 341         for (so_begin = buf, so_end = (uint8_t *)buf + len;
 342              (uint8_t *)so_begin + sizeof(size_t) < (uint8_t *)so_end &&
 343              (uint8_t *)so_begin + *(size_t *)so_begin <= (uint8_t *)so_end;
 344              so_begin = (uint8_t *)so_begin + *(size_t *)so_begin) {
 345                 xup = so_begin;
 346                 if (xup->xu_len != sizeof *xup) {
 347                         warnx("struct xunpcb size mismatch");
 348                         goto out;
 349                 }
 350                 if ((xup->xu_unp.unp_conn == NULL && !opt_l) ||
 351                     (xup->xu_unp.unp_conn != NULL && !opt_c))
 352                         continue;
 353                 if ((sock = calloc(1, sizeof *sock)) == NULL)
 354                         err(1, "malloc()");
 355                 sock->socket = xup->xu_socket.xso_so;
 356                 sock->pcb = xup->xu_unpp;
 357                 sock->proto = proto;
 358                 sock->family = AF_UNIX;
 359                 sock->protoname = protoname;
 360                 if (xup->xu_unp.unp_addr != NULL)
 361                         sock->laddr =
 362                             *(struct sockaddr_storage *)(void *)&xup->xu_addr;
 363                 else if (xup->xu_unp.unp_conn != NULL)
 364                         *(void **)&sock->faddr = xup->xu_unp.unp_conn;
 365                 hash = (int)((uintptr_t)sock->socket % HASHSIZE);
 366                 sock->next = sockhash[hash];
 367                 sockhash[hash] = sock;
 368         }
 369 out:
 370         free(buf);
 371 }
 372
 373 static void
 374 getfiles(void)
 375 {
 376         if (kinfo_get_files(&xfiles, &nxfiles))
 377                 err(1, "kinfo_get_files");
 378 }
 379
 380 static int
 381 printaddr(int af, struct sockaddr_storage *ss)
 382 {
 383         char addrstr[INET6_ADDRSTRLEN] = { '\0', '\0' };
 384         struct sockaddr_un *sun;
 385         void *addr;
 386         int off, port;
 387
 388         switch (af) {
 389         case AF_INET:
 390                 addr = &((struct sockaddr_in *)ss)->sin_addr;
 391                 if (inet_lnaof(*(struct in_addr *)addr) == INADDR_ANY)
 392                         addrstr[0] = '*';
 393                 port = ntohs(((struct sockaddr_in *)ss)->sin_port);
 394                 break;
 395         case AF_INET6:
 396                 addr = &((struct sockaddr_in6 *)ss)->sin6_addr;
 397                 if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)addr))
 398                         addrstr[0] = '*';
 399                 port = ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
 400                 break;
 401         case AF_UNIX:
 402                 sun = (struct sockaddr_un *)ss;
 403                 off = (int)((char *)&sun->sun_path - (char *)sun);
 404                 return (xprintf("%.*s", sun->sun_len - off, sun->sun_path));
 405         default:
 406                 abort();
 407         }
 408         if (addrstr[0] == '\0')
 409                 inet_ntop(af, addr, addrstr, sizeof addrstr);
 410         if (port == 0)
 411                 return xprintf("%s:*", addrstr);
 412         else
 413                 return xprintf("%s:%d", addrstr, port);
 414 }
 415
 416 static const char *
 417 getprocname(pid_t pid)
 418 {
 419         static struct kinfo_proc proc;
 420         size_t len;
 421         int mib[4];
 422
 423         mib[0] = CTL_KERN;
 424         mib[1] = KERN_PROC;
 425         mib[2] = KERN_PROC_PID;
 426         mib[3] = (int)pid;
 427         len = sizeof proc;
 428         if (sysctl(mib, 4, &proc, &len, NULL, 0) == -1) {
 429                 warn("sysctl()");
 430                 return ("??");
 431         }
 432         return (proc.kp_comm);
 433 }
 434
 435 static int
 436 check_ports(struct sock *s)
 437 {
 438         int port;
 439
 440         if (ports == NULL)
 441                 return (1);
 442         if ((s->family != AF_INET) && (s->family != AF_INET6))
 443                 return (1);
 444         if (s->family == AF_INET)
 445                 port = ntohs(((struct sockaddr_in *)(&s->laddr))->sin_port);
 446         else
 447                 port = ntohs(((struct sockaddr_in6 *)(&s->laddr))->sin6_port);
 448         if (CHK_PORT(port))
 449                 return (1);
 450         if (s->family == AF_INET)
 451                 port = ntohs(((struct sockaddr_in *)(&s->faddr))->sin_port);
 452         else
 453                 port = ntohs(((struct sockaddr_in6 *)(&s->faddr))->sin6_port);
 454         if (CHK_PORT(port))
 455                 return (1);
 456         return (0);
 457 }
 458
 459 static void
 460 display(void)
 461 {
 462         struct passwd *pwd;
 463         struct kinfo_file *xf;
 464         struct sock *s;
 465         void *p;
 466         int hash, n, pos;
 467
 468         printf("%-8s %-10s %-5s %-2s %-6s %-21s %-21s\n",
 469             "USER", "COMMAND", "PID", "FD", "PROTO",
 470             "LOCAL ADDRESS", "FOREIGN ADDRESS");
 471         setpassent(1);
 472         for (xf = xfiles, n = 0; n < nxfiles; ++n, ++xf) {
 473                 if (xf->f_data == NULL)
 474                         continue;
 475                 hash = (int)((uintptr_t)xf->f_data % HASHSIZE);
 476                 for (s = sockhash[hash]; s != NULL; s = s->next)
 477                         if ((void *)s->socket == xf->f_data)
 478                                 break;
 479                 if (s == NULL)
 480                         continue;
 481                 if (!check_ports(s))
 482                         continue;
 483                 pos = 0;
 484                 if ((pwd = getpwuid(xf->f_uid)) == NULL)
 485                         pos += xprintf("%lu", (u_long)xf->f_uid);
 486                 else
 487                         pos += xprintf("%s", pwd->pw_name);
 488                 while (pos < 9)
 489                         pos += xprintf(" ");
 490                 pos += xprintf("%.10s", getprocname(xf->f_pid));
 491                 while (pos < 20)
 492                         pos += xprintf(" ");
 493                 pos += xprintf("%lu", (u_long)xf->f_pid);
 494                 while (pos < 26)
 495                         pos += xprintf(" ");
 496                 pos += xprintf("%d", xf->f_fd);
 497                 while (pos < 29)
 498                         pos += xprintf(" ");
 499                 pos += xprintf("%s", s->protoname);
 500                 if (s->vflag & INP_IPV4)
 501                         pos += xprintf("4");
 502                 if (s->vflag & INP_IPV6)
 503                         pos += xprintf("6");
 504                 while (pos < 36)
 505                         pos += xprintf(" ");
 506                 switch (s->family) {
 507                 case AF_INET:
 508                 case AF_INET6:
 509                         pos += printaddr(s->family, &s->laddr);
 510                         while (pos < 57)
 511                                 pos += xprintf(" ");
 512                         pos += xprintf(" ");
 513                         pos += printaddr(s->family, &s->faddr);
 514                         break;
 515                 case AF_UNIX:
 516                         /* server */
 517                         if (s->laddr.ss_len > 0) {
 518                                 pos += printaddr(s->family, &s->laddr);
 519                                 break;
 520                         }
 521                         /* client */
 522                         p = *(void **)&s->faddr;
 523                         if (p == NULL) {
 524                                 pos += xprintf("(not connected)");
 525                                 break;
 526                         }
 527                         pos += xprintf("-> ");
 528                         for (hash = 0; hash < HASHSIZE; ++hash) {
 529                                 for (s = sockhash[hash]; s != NULL; s = s->next)
 530                                         if (s->pcb == p)
 531                                                 break;
 532                                 if (s != NULL)
 533                                         break;
 534                         }
 535                         if (s == NULL || s->laddr.ss_len == 0)
 536                                 pos += xprintf("??");
 537                         else
 538                                 pos += printaddr(s->family, &s->laddr);
 539                         break;
 540                 default:
 541                         abort();
 542                 }
 543                 xprintf("\n");
 544         }
 545 }
 546
 547 static void
 548 usage(void)
 549 {
 550         fprintf(stderr, "Usage: sockstat [-46clu] [-p ports]\n");
 551         exit(1);
 552 }
 553
 554 int
 555 main(int argc, char *argv[])
 556 {
 557         int o;
 558
 559         while ((o = getopt(argc, argv, "46clp:uv")) != -1)
 560                 switch (o) {
 561                 case '4':
 562                         opt_4 = 1;
 563                         break;
 564                 case '6':
 565                         opt_6 = 1;
 566                         break;
 567                 case 'c':
 568                         opt_c = 1;
 569                         break;
 570                 case 'l':
 571                         opt_l = 1;
 572                         break;
 573                 case 'p':
 574                         parse_ports(optarg);
 575                         break;
 576                 case 'u':
 577                         opt_u = 1;
 578                         break;
 579                 case 'v':
 580                         ++opt_v;
 581                         break;
 582                 default:
 583                         usage();
 584                 }
 585
 586         argc -= optind;
 587         argv += optind;
 588
 589         if (argc > 0)
 590                 usage();
 591
 592         if (!opt_4 && !opt_6 && !opt_u)
 593                 opt_4 = opt_6 = opt_u = 1;
 594         if (!opt_c && !opt_l)
 595                 opt_c = opt_l = 1;
 596
 597         if (opt_4 || opt_6) {
 598                 gather_inet(IPPROTO_TCP);
 599                 gather_inet(IPPROTO_UDP);
 600                 gather_inet(IPPROTO_DIVERT);
 601         }
 602         if (opt_u) {
 603                 gather_unix(SOCK_STREAM);
 604                 gather_unix(SOCK_DGRAM);
 605         }
 606         getfiles();
 607         display();
 608
 609         exit(0);
 610 }