LXR busybox/networking/netstat.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini netstat implementation(s) for busybox
   4 * based in part on the netstat implementation from net-tools.
   5 *
   6 * Copyright (C) 2002 by Bart Visscher <magick@linux-fan.com>
   7 *
   8 * 2002-04-20
   9 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  10 *
  11 * 2008-07-10
  12 * optional '-p' flag support ported from net-tools by G. Somlo <somlo@cmu.edu>
  13 *
  14 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  15 */
  16
  17#include "libbb.h"
  18#include "inet_common.h"
  19
  20#define NETSTAT_OPTS "laentuwx" \
  21        USE_ROUTE(               "r") \
  22        USE_FEATURE_NETSTAT_WIDE("W") \
  23        USE_FEATURE_NETSTAT_PRG( "p")
  24
  25enum {
  26        OPTBIT_KEEP_OLD = 7,
  27        USE_ROUTE(               OPTBIT_ROUTE,)
  28        USE_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
  29        USE_FEATURE_NETSTAT_PRG( OPTBIT_PRG  ,)
  30        OPT_sock_listen = 1 << 0, // l
  31        OPT_sock_all    = 1 << 1, // a
  32        OPT_extended    = 1 << 2, // e
  33        OPT_noresolve   = 1 << 3, // n
  34        OPT_sock_tcp    = 1 << 4, // t
  35        OPT_sock_udp    = 1 << 5, // u
  36        OPT_sock_raw    = 1 << 6, // w
  37        OPT_sock_unix   = 1 << 7, // x
  38        OPT_route       = USE_ROUTE(               (1 << OPTBIT_ROUTE)) + 0, // r
  39        OPT_wide        = USE_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
  40        OPT_prg         = USE_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG  )) + 0, // p
  41};
  42
  43#define NETSTAT_CONNECTED 0x01
  44#define NETSTAT_LISTENING 0x02
  45#define NETSTAT_NUMERIC   0x04
  46/* Must match getopt32 option string */
  47#define NETSTAT_TCP       0x10
  48#define NETSTAT_UDP       0x20
  49#define NETSTAT_RAW       0x40
  50#define NETSTAT_UNIX      0x80
  51#define NETSTAT_ALLPROTO  (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
  52
  53
  54enum {
  55        TCP_ESTABLISHED = 1,
  56        TCP_SYN_SENT,
  57        TCP_SYN_RECV,
  58        TCP_FIN_WAIT1,
  59        TCP_FIN_WAIT2,
  60        TCP_TIME_WAIT,
  61        TCP_CLOSE,
  62        TCP_CLOSE_WAIT,
  63        TCP_LAST_ACK,
  64        TCP_LISTEN,
  65        TCP_CLOSING, /* now a valid state */
  66};
  67
  68static const char *const tcp_state[] = {
  69        "",
  70        "ESTABLISHED",
  71        "SYN_SENT",
  72        "SYN_RECV",
  73        "FIN_WAIT1",
  74        "FIN_WAIT2",
  75        "TIME_WAIT",
  76        "CLOSE",
  77        "CLOSE_WAIT",
  78        "LAST_ACK",
  79        "LISTEN",
  80        "CLOSING"
  81};
  82
  83typedef enum {
  84        SS_FREE = 0,     /* not allocated                */
  85        SS_UNCONNECTED,  /* unconnected to any socket    */
  86        SS_CONNECTING,   /* in process of connecting     */
  87        SS_CONNECTED,    /* connected to socket          */
  88        SS_DISCONNECTING /* in process of disconnecting  */
  89} socket_state;
  90
  91#define SO_ACCEPTCON (1<<16)    /* performed a listen           */
  92#define SO_WAITDATA  (1<<17)    /* wait data to read            */
  93#define SO_NOSPACE   (1<<18)    /* no space to write            */
  94
  95/* Standard printout size */
  96#define PRINT_IP_MAX_SIZE           23
  97#define PRINT_NET_CONN              "%s   %6ld %6ld %-23s %-23s %-12s"
  98#define PRINT_NET_CONN_HEADER       "\nProto Recv-Q Send-Q %-23s %-23s State       "
  99
 100/* When there are IPv6 connections the IPv6 addresses will be
 101 * truncated to none-recognition. The '-W' option makes the
 102 * address columns wide enough to accomodate for longest possible
 103 * IPv6 addresses, i.e. addresses of the form
 104 * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
 105 */
 106#define PRINT_IP_MAX_SIZE_WIDE      51  /* INET6_ADDRSTRLEN + 5 for the port number */
 107#define PRINT_NET_CONN_WIDE         "%s   %6ld %6ld %-51s %-51s %-12s"
 108#define PRINT_NET_CONN_HEADER_WIDE  "\nProto Recv-Q Send-Q %-51s %-51s State       "
 109
 110
 111#define PROGNAME_WIDTH     20
 112#define PROGNAME_WIDTH_STR "20"
 113/* PROGNAME_WIDTH chars: 12345678901234567890 */
 114#define PROGNAME_BANNER "PID/Program name    "
 115
 116struct prg_node {
 117        struct prg_node *next;
 118        long inode;
 119        char name[PROGNAME_WIDTH];
 120};
 121
 122#define PRG_HASH_SIZE 211
 123
 124
 125struct globals {
 126        const char *net_conn_line;
 127        smallint flags;
 128#if ENABLE_FEATURE_NETSTAT_PRG
 129        smallint prg_cache_loaded;
 130        struct prg_node *prg_hash[PRG_HASH_SIZE];
 131#endif
 132};
 133#define G (*ptr_to_globals)
 134#define flags            (G.flags           )
 135#define net_conn_line    (G.net_conn_line   )
 136#define prg_hash         (G.prg_hash        )
 137#define prg_cache_loaded (G.prg_cache_loaded)
 138#define INIT_G() do { \
 139        SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 140        flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \
 141        net_conn_line = PRINT_NET_CONN; \
 142} while (0)
 143
 144
 145#if ENABLE_FEATURE_NETSTAT_PRG
 146
 147/* Deliberately truncating long to unsigned *int* */
 148#define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
 149
 150#define print_progname_banner() do { \
 151        if (option_mask32 & OPT_prg) printf(PROGNAME_BANNER); \
 152} while (0)
 153
 154static void prg_cache_add(long inode, char *name)
 155{
 156        unsigned hi = PRG_HASHIT(inode);
 157        struct prg_node **pnp, *pn;
 158
 159        prg_cache_loaded = 2;
 160        for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) {
 161                if (pn->inode == inode) {
 162                        /* Some warning should be appropriate here
 163                           as we got multiple processes for one i-node */
 164                        return;
 165                }
 166        }
 167        *pnp = xzalloc(sizeof(struct prg_node));
 168        pn = *pnp;
 169        pn->inode = inode;
 170        safe_strncpy(pn->name, name, PROGNAME_WIDTH);
 171}
 172
 173static const char *prg_cache_get(long inode)
 174{
 175        unsigned hi = PRG_HASHIT(inode);
 176        struct prg_node *pn;
 177
 178        for (pn = prg_hash[hi]; pn; pn = pn->next)
 179                if (pn->inode == inode)
 180                        return pn->name;
 181        return "-";
 182}
 183
 184#if ENABLE_FEATURE_CLEAN_UP
 185static void prg_cache_clear(void)
 186{
 187        struct prg_node **pnp, *pn;
 188
 189        for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) {
 190                while ((pn = *pnp) != NULL) {
 191                        *pnp = pn->next;
 192                        free(pn);
 193                }
 194        }
 195}
 196#else
 197#define prg_cache_clear() ((void)0)
 198#endif
 199
 200static long extract_socket_inode(const char *lname)
 201{
 202        long inode = -1;
 203
 204        if (strncmp(lname, "socket:[", sizeof("socket:[")-1) == 0) {
 205                /* "socket:[12345]", extract the "12345" as inode */
 206                inode = bb_strtol(lname + sizeof("socket:[")-1, (char**)&lname, 0);
 207                if (*lname != ']')
 208                        inode = -1;
 209        } else if (strncmp(lname, "[0000]:", sizeof("[0000]:")-1) == 0) {
 210                /* "[0000]:12345", extract the "12345" as inode */
 211                inode = bb_strtol(lname + sizeof("[0000]:")-1, NULL, 0);
 212                if (errno) /* not NUL terminated? */
 213                        inode = -1;
 214        }
 215
 216#if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */
 217        if (errno == ERANGE)
 218                inode = -1;
 219#endif
 220        return inode;
 221}
 222
 223static int FAST_FUNC file_act(const char *fileName,
 224                struct stat *statbuf UNUSED_PARAM,
 225                void *userData,
 226                int depth UNUSED_PARAM)
 227{
 228        char *linkname;
 229        long inode;
 230
 231        linkname = xmalloc_readlink(fileName);
 232        if (linkname != NULL) {
 233                inode = extract_socket_inode(linkname);
 234                free(linkname);
 235                if (inode >= 0)
 236                        prg_cache_add(inode, (char *)userData);
 237        }
 238        return TRUE;
 239}
 240
 241static int FAST_FUNC dir_act(const char *fileName,
 242                struct stat *statbuf UNUSED_PARAM,
 243                void *userData UNUSED_PARAM,
 244                int depth)
 245{
 246        const char *shortName;
 247        char *p, *q;
 248        char cmdline_buf[512];
 249        int i;
 250
 251        if (depth == 0) /* "/proc" itself */
 252                return TRUE; /* continue looking one level below /proc */
 253
 254        shortName = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
 255        if (!isdigit(shortName[0])) /* skip /proc entries whic aren't processes */
 256                return SKIP;
 257
 258        p = concat_path_file(fileName, "cmdline"); /* "/proc/PID/cmdline" */
 259        i = open_read_close(p, cmdline_buf, sizeof(cmdline_buf) - 1);
 260        free(p);
 261        if (i < 0)
 262                return FALSE;
 263        cmdline_buf[i] = '\0';
 264        q = concat_path_file(shortName, bb_basename(cmdline_buf)); /* "PID/argv0" */
 265
 266        /* go through all files in /proc/PID/fd */
 267        p = concat_path_file(fileName, "fd");
 268        i = recursive_action(p, ACTION_RECURSE | ACTION_QUIET,
 269                                file_act, NULL, (void *)q, 0);
 270
 271        free(p);
 272        free(q);
 273
 274        if (!i)
 275                return FALSE;   /* signal permissions error to caller */
 276
 277        return SKIP;            /* caller should not recurse further into this dir. */
 278}
 279
 280static void prg_cache_load(void)
 281{
 282        int load_ok;
 283
 284        prg_cache_loaded = 1;
 285        load_ok = recursive_action("/proc", ACTION_RECURSE | ACTION_QUIET,
 286                                NULL, dir_act, NULL, 0);
 287        if (load_ok)
 288                return;
 289
 290        if (prg_cache_loaded == 1)
 291                bb_error_msg("can't scan /proc - are you root?");
 292        else
 293                bb_error_msg("showing only processes with your user ID");
 294}
 295
 296#else
 297
 298#define prg_cache_clear()       ((void)0)
 299#define print_progname_banner() ((void)0)
 300
 301#endif //ENABLE_FEATURE_NETSTAT_PRG
 302
 303
 304#if ENABLE_FEATURE_IPV6
 305static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
 306{
 307        char addr6[INET6_ADDRSTRLEN];
 308        struct in6_addr in6;
 309
 310        sscanf(local_addr, "%08X%08X%08X%08X",
 311                   &in6.s6_addr32[0], &in6.s6_addr32[1],
 312                   &in6.s6_addr32[2], &in6.s6_addr32[3]);
 313        inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
 314        inet_pton(AF_INET6, addr6, (struct sockaddr *) &localaddr->sin6_addr);
 315
 316        localaddr->sin6_family = AF_INET6;
 317}
 318#endif
 319
 320#if ENABLE_FEATURE_IPV6
 321static void build_ipv4_addr(char* local_addr, struct sockaddr_in6* localaddr)
 322#else
 323static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
 324#endif
 325{
 326        sscanf(local_addr, "%X",
 327                   &((struct sockaddr_in *) localaddr)->sin_addr.s_addr);
 328        ((struct sockaddr *) localaddr)->sa_family = AF_INET;
 329}
 330
 331static const char *get_sname(int port, const char *proto, int numeric)
 332{
 333        if (!port)
 334                return "*";
 335        if (!numeric) {
 336                struct servent *se = getservbyport(port, proto);
 337                if (se)
 338                        return se->s_name;
 339        }
 340        /* hummm, we may return static buffer here!! */
 341        return itoa(ntohs(port));
 342}
 343
 344static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
 345{
 346        char *host, *host_port;
 347
 348        /* Code which used "*" for INADDR_ANY is removed: it's ambiguous
 349         * in IPv6, while "0.0.0.0" is not. */
 350
 351        host = numeric ? xmalloc_sockaddr2dotted_noport(addr)
 352                       : xmalloc_sockaddr2host_noport(addr);
 353
 354        host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
 355        free(host);
 356        return host_port;
 357}
 358
 359struct inet_params {
 360        int local_port, rem_port, state, uid;
 361#if ENABLE_FEATURE_IPV6
 362        struct sockaddr_in6 localaddr, remaddr;
 363#else
 364        struct sockaddr_in localaddr, remaddr;
 365#endif
 366        unsigned long rxq, txq, inode;
 367};
 368
 369static int scan_inet_proc_line(struct inet_params *param, char *line)
 370{
 371        int num;
 372        char local_addr[64], rem_addr[64];
 373
 374        num = sscanf(line,
 375                        "%*d: %64[0-9A-Fa-f]:%X "
 376                        "%64[0-9A-Fa-f]:%X %X "
 377                        "%lX:%lX %*X:%*X "
 378                        "%*X %d %*d %ld ",
 379                        local_addr, &param->local_port,
 380                        rem_addr, &param->rem_port, &param->state,
 381                        &param->txq, &param->rxq,
 382                        &param->uid, &param->inode);
 383        if (num < 9) {
 384                return 1; /* error */
 385        }
 386
 387        if (strlen(local_addr) > 8) {
 388#if ENABLE_FEATURE_IPV6
 389                build_ipv6_addr(local_addr, &param->localaddr);
 390                build_ipv6_addr(rem_addr, &param->remaddr);
 391#endif
 392        } else {
 393                build_ipv4_addr(local_addr, &param->localaddr);
 394                build_ipv4_addr(rem_addr, &param->remaddr);
 395        }
 396        return 0;
 397}
 398
 399static void print_inet_line(struct inet_params *param,
 400                const char *state_str, const char *proto, int is_connected)
 401{
 402        if ((is_connected && (flags & NETSTAT_CONNECTED))
 403         || (!is_connected && (flags & NETSTAT_LISTENING))
 404        ) {
 405                char *l = ip_port_str(
 406                                (struct sockaddr *) &param->localaddr, param->local_port,
 407                                proto, flags & NETSTAT_NUMERIC);
 408                char *r = ip_port_str(
 409                                (struct sockaddr *) &param->remaddr, param->rem_port,
 410                                proto, flags & NETSTAT_NUMERIC);
 411                printf(net_conn_line,
 412                        proto, param->rxq, param->txq, l, r, state_str);
 413#if ENABLE_FEATURE_NETSTAT_PRG
 414                if (option_mask32 & OPT_prg)
 415                        printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode));
 416#endif
 417                bb_putchar('\n');
 418                free(l);
 419                free(r);
 420        }
 421}
 422
 423static int FAST_FUNC tcp_do_one(char *line)
 424{
 425        struct inet_params param;
 426
 427        if (scan_inet_proc_line(&param, line))
 428                return 1;
 429
 430        print_inet_line(&param, tcp_state[param.state], "tcp", param.rem_port);
 431        return 0;
 432}
 433
 434#if ENABLE_FEATURE_IPV6
 435# define notnull(A) ( \
 436        ( (A.sin6_family == AF_INET6)                               \
 437          && (A.sin6_addr.s6_addr32[0] | A.sin6_addr.s6_addr32[1] | \
 438              A.sin6_addr.s6_addr32[2] | A.sin6_addr.s6_addr32[3])  \
 439        ) || (                                                      \
 440          (A.sin6_family == AF_INET)                                \
 441          && ((struct sockaddr_in*)&A)->sin_addr.s_addr             \
 442        )                                                           \
 443)
 444#else
 445# define notnull(A) (A.sin_addr.s_addr)
 446#endif
 447
 448static int FAST_FUNC udp_do_one(char *line)
 449{
 450        int have_remaddr;
 451        const char *state_str;
 452        struct inet_params param;
 453
 454        if (scan_inet_proc_line(&param, line))
 455                return 1;
 456
 457        state_str = "UNKNOWN";
 458        switch (param.state) {
 459        case TCP_ESTABLISHED:
 460                state_str = "ESTABLISHED";
 461                break;
 462        case TCP_CLOSE:
 463                state_str = "";
 464                break;
 465        }
 466
 467        have_remaddr = notnull(param.remaddr);
 468        print_inet_line(&param, state_str, "udp", have_remaddr);
 469        return 0;
 470}
 471
 472static int FAST_FUNC raw_do_one(char *line)
 473{
 474        int have_remaddr;
 475        struct inet_params param;
 476
 477        if (scan_inet_proc_line(&param, line))
 478                return 1;
 479
 480        have_remaddr = notnull(param.remaddr);
 481        print_inet_line(&param, itoa(param.state), "raw", have_remaddr);
 482        return 0;
 483}
 484
 485static int FAST_FUNC unix_do_one(char *line)
 486{
 487        unsigned long refcnt, proto, unix_flags;
 488        unsigned long inode;
 489        int type, state;
 490        int num, path_ofs;
 491        const char *ss_proto, *ss_state, *ss_type;
 492        char ss_flags[32];
 493
 494        /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
 495         * Other users report long lines filled by NUL bytes.
 496         * (those ^@ are NUL bytes too). We see them as empty lines. */
 497        if (!line[0])
 498                return 0;
 499
 500        path_ofs = 0; /* paranoia */
 501        num = sscanf(line, "%*p: %lX %lX %lX %X %X %lu %n",
 502                        &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
 503        if (num < 6) {
 504                return 1; /* error */
 505        }
 506        if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
 507                if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
 508                        if (!(flags & NETSTAT_LISTENING))
 509                                return 0;
 510                } else {
 511                        if (!(flags & NETSTAT_CONNECTED))
 512                                return 0;
 513                }
 514        }
 515
 516        switch (proto) {
 517                case 0:
 518                        ss_proto = "unix";
 519                        break;
 520                default:
 521                        ss_proto = "??";
 522        }
 523
 524        switch (type) {
 525                case SOCK_STREAM:
 526                        ss_type = "STREAM";
 527                        break;
 528                case SOCK_DGRAM:
 529                        ss_type = "DGRAM";
 530                        break;
 531                case SOCK_RAW:
 532                        ss_type = "RAW";
 533                        break;
 534                case SOCK_RDM:
 535                        ss_type = "RDM";
 536                        break;
 537                case SOCK_SEQPACKET:
 538                        ss_type = "SEQPACKET";
 539                        break;
 540                default:
 541                        ss_type = "UNKNOWN";
 542        }
 543
 544        switch (state) {
 545                case SS_FREE:
 546                        ss_state = "FREE";
 547                        break;
 548                case SS_UNCONNECTED:
 549                        /*
 550                         * Unconnected sockets may be listening
 551                         * for something.
 552                         */
 553                        if (unix_flags & SO_ACCEPTCON) {
 554                                ss_state = "LISTENING";
 555                        } else {
 556                                ss_state = "";
 557                        }
 558                        break;
 559                case SS_CONNECTING:
 560                        ss_state = "CONNECTING";
 561                        break;
 562                case SS_CONNECTED:
 563                        ss_state = "CONNECTED";
 564                        break;
 565                case SS_DISCONNECTING:
 566                        ss_state = "DISCONNECTING";
 567                        break;
 568                default:
 569                        ss_state = "UNKNOWN";
 570        }
 571
 572        strcpy(ss_flags, "[ ");
 573        if (unix_flags & SO_ACCEPTCON)
 574                strcat(ss_flags, "ACC ");
 575        if (unix_flags & SO_WAITDATA)
 576                strcat(ss_flags, "W ");
 577        if (unix_flags & SO_NOSPACE)
 578                strcat(ss_flags, "N ");
 579        strcat(ss_flags, "]");
 580
 581        printf("%-5s %-6ld %-11s %-10s %-13s %6lu ",
 582                ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
 583                );
 584
 585#if ENABLE_FEATURE_NETSTAT_PRG
 586        if (option_mask32 & OPT_prg)
 587                printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode));
 588#endif
 589
 590        /* TODO: currently we stop at first NUL byte. Is it a problem? */
 591        line += path_ofs;
 592        *strchrnul(line, '\n') = '\0';
 593        while (*line)
 594                fputc_printable(*line++, stdout);
 595        bb_putchar('\n');
 596        return 0;
 597}
 598
 599static void do_info(const char *file, int FAST_FUNC (*proc)(char *))
 600{
 601        int lnr;
 602        FILE *procinfo;
 603        char *buffer;
 604
 605        /* _stdin is just to save "r" param */
 606        procinfo = fopen_or_warn_stdin(file);
 607        if (procinfo == NULL) {
 608                return;
 609        }
 610        lnr = 0;
 611        /* Why xmalloc_fgets_str? because it doesn't stop on NULs */
 612        while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
 613                /* line 0 is skipped */
 614                if (lnr && proc(buffer))
 615                        bb_error_msg("%s: bogus data on line %d", file, lnr + 1);
 616                lnr++;
 617                free(buffer);
 618        }
 619        fclose(procinfo);
 620}
 621
 622int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 623int netstat_main(int argc UNUSED_PARAM, char **argv)
 624{
 625        const char *net_conn_line_header = PRINT_NET_CONN_HEADER;
 626        unsigned opt;
 627
 628        INIT_G();
 629
 630        /* Option string must match NETSTAT_xxx constants */
 631        opt = getopt32(argv, NETSTAT_OPTS);
 632        if (opt & 0x1) { // -l
 633                flags &= ~NETSTAT_CONNECTED;
 634                flags |= NETSTAT_LISTENING;
 635        }
 636        if (opt & 0x2) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
 637        //if (opt & 0x4) // -e
 638        if (opt & 0x8) flags |= NETSTAT_NUMERIC; // -n
 639        //if (opt & 0x10) // -t: NETSTAT_TCP
 640        //if (opt & 0x20) // -u: NETSTAT_UDP
 641        //if (opt & 0x40) // -w: NETSTAT_RAW
 642        //if (opt & 0x80) // -x: NETSTAT_UNIX
 643        if (opt & OPT_route) { // -r
 644#if ENABLE_ROUTE
 645                bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
 646                return 0;
 647#else
 648                bb_show_usage();
 649#endif
 650        }
 651        if (opt & OPT_wide) { // -W
 652                net_conn_line = PRINT_NET_CONN_WIDE;
 653                net_conn_line_header = PRINT_NET_CONN_HEADER_WIDE;
 654        }
 655#if ENABLE_FEATURE_NETSTAT_PRG
 656        if (opt & OPT_prg) { // -p
 657                prg_cache_load();
 658        }
 659#endif
 660
 661        opt &= NETSTAT_ALLPROTO;
 662        if (opt) {
 663                flags &= ~NETSTAT_ALLPROTO;
 664                flags |= opt;
 665        }
 666        if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
 667                printf("Active Internet connections "); /* xxx */
 668
 669                if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
 670                        printf("(servers and established)");
 671                else if (flags & NETSTAT_LISTENING)
 672                        printf("(only servers)");
 673                else
 674                        printf("(w/o servers)");
 675                printf(net_conn_line_header, "Local Address", "Foreign Address");
 676                print_progname_banner();
 677                bb_putchar('\n');
 678        }
 679        if (flags & NETSTAT_TCP) {
 680                do_info("/proc/net/tcp", tcp_do_one);
 681#if ENABLE_FEATURE_IPV6
 682                do_info("/proc/net/tcp6", tcp_do_one);
 683#endif
 684        }
 685        if (flags & NETSTAT_UDP) {
 686                do_info("/proc/net/udp", udp_do_one);
 687#if ENABLE_FEATURE_IPV6
 688                do_info("/proc/net/udp6", udp_do_one);
 689#endif
 690        }
 691        if (flags & NETSTAT_RAW) {
 692                do_info("/proc/net/raw", raw_do_one);
 693#if ENABLE_FEATURE_IPV6
 694                do_info("/proc/net/raw6", raw_do_one);
 695#endif
 696        }
 697        if (flags & NETSTAT_UNIX) {
 698                printf("Active UNIX domain sockets ");
 699                if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
 700                        printf("(servers and established)");
 701                else if (flags & NETSTAT_LISTENING)
 702                        printf("(only servers)");
 703                else
 704                        printf("(w/o servers)");
 705                printf("\nProto RefCnt Flags       Type       State         I-Node ");
 706                print_progname_banner();
 707                printf("Path\n");
 708                do_info("/proc/net/unix", unix_do_one);
 709        }
 710        prg_cache_clear();
 711        return 0;
 712}
 713