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 source tree.
  15 */
  16//config:config NETSTAT
  17//config:       bool "netstat (10 kb)"
  18//config:       default y
  19//config:       select PLATFORM_LINUX
  20//config:       help
  21//config:       netstat prints information about the Linux networking subsystem.
  22//config:
  23//config:config FEATURE_NETSTAT_WIDE
  24//config:       bool "Enable wide output"
  25//config:       default y
  26//config:       depends on NETSTAT
  27//config:       help
  28//config:       Add support for wide columns. Useful when displaying IPv6 addresses
  29//config:       (-W option).
  30//config:
  31//config:config FEATURE_NETSTAT_PRG
  32//config:       bool "Enable PID/Program name output"
  33//config:       default y
  34//config:       depends on NETSTAT
  35//config:       help
  36//config:       Add support for -p flag to print out PID and program name.
  37//config:       +700 bytes of code.
  38
  39//applet:IF_NETSTAT(APPLET(netstat, BB_DIR_BIN, BB_SUID_DROP))
  40
  41//kbuild:lib-$(CONFIG_NETSTAT) += netstat.o
  42
  43#include "libbb.h"
  44#include "inet_common.h"
  45
  46//usage:#define netstat_trivial_usage
  47//usage:       "[-"IF_ROUTE("r")"al] [-tuwx] [-en"IF_FEATURE_NETSTAT_WIDE("W")IF_FEATURE_NETSTAT_PRG("p")"]"
  48//usage:#define netstat_full_usage "\n\n"
  49//usage:       "Display networking information\n"
  50//usage:        IF_ROUTE(
  51//usage:     "\n        -r      Routing table"
  52//usage:        )
  53//usage:     "\n        -a      All sockets"
  54//usage:     "\n        -l      Listening sockets"
  55//usage:     "\n                Else: connected sockets"
  56//usage:     "\n        -t      TCP sockets"
  57//usage:     "\n        -u      UDP sockets"
  58//usage:     "\n        -w      Raw sockets"
  59//usage:     "\n        -x      Unix sockets"
  60//usage:     "\n                Else: all socket types"
  61//usage:     "\n        -e      Other/more information"
  62//usage:     "\n        -n      Don't resolve names"
  63//usage:        IF_FEATURE_NETSTAT_WIDE(
  64//usage:     "\n        -W      Wide display"
  65//usage:        )
  66//usage:        IF_FEATURE_NETSTAT_PRG(
  67//usage:     "\n        -p      Show PID/program name for sockets"
  68//usage:        )
  69
  70#define NETSTAT_OPTS "laentuwx" \
  71        IF_ROUTE(               "r") \
  72        IF_FEATURE_NETSTAT_WIDE("W") \
  73        IF_FEATURE_NETSTAT_PRG( "p")
  74
  75enum {
  76        OPT_sock_listen = 1 << 0, // l
  77        OPT_sock_all    = 1 << 1, // a
  78        OPT_extended    = 1 << 2, // e
  79        OPT_noresolve   = 1 << 3, // n
  80        OPT_sock_tcp    = 1 << 4, // t
  81        OPT_sock_udp    = 1 << 5, // u
  82        OPT_sock_raw    = 1 << 6, // w
  83        OPT_sock_unix   = 1 << 7, // x
  84        OPTBIT_x        = 7,
  85        IF_ROUTE(               OPTBIT_ROUTE,)
  86        IF_FEATURE_NETSTAT_WIDE(OPTBIT_WIDE ,)
  87        IF_FEATURE_NETSTAT_PRG( OPTBIT_PRG  ,)
  88        OPT_route       = IF_ROUTE(               (1 << OPTBIT_ROUTE)) + 0, // r
  89        OPT_wide        = IF_FEATURE_NETSTAT_WIDE((1 << OPTBIT_WIDE )) + 0, // W
  90        OPT_prg         = IF_FEATURE_NETSTAT_PRG( (1 << OPTBIT_PRG  )) + 0, // p
  91};
  92
  93#define NETSTAT_CONNECTED 0x01
  94#define NETSTAT_LISTENING 0x02
  95#define NETSTAT_NUMERIC   0x04
  96/* Must match getopt32 option string */
  97#define NETSTAT_TCP       0x10
  98#define NETSTAT_UDP       0x20
  99#define NETSTAT_RAW       0x40
 100#define NETSTAT_UNIX      0x80
 101#define NETSTAT_ALLPROTO  (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW|NETSTAT_UNIX)
 102
 103
 104enum {
 105        TCP_ESTABLISHED = 1,
 106        TCP_SYN_SENT,
 107        TCP_SYN_RECV,
 108        TCP_FIN_WAIT1,
 109        TCP_FIN_WAIT2,
 110        TCP_TIME_WAIT,
 111        TCP_CLOSE,
 112        TCP_CLOSE_WAIT,
 113        TCP_LAST_ACK,
 114        TCP_LISTEN,
 115        TCP_CLOSING, /* now a valid state */
 116};
 117
 118static const char *const tcp_state[] = {
 119        "",
 120        "ESTABLISHED",
 121        "SYN_SENT",
 122        "SYN_RECV",
 123        "FIN_WAIT1",
 124        "FIN_WAIT2",
 125        "TIME_WAIT",
 126        "CLOSE",
 127        "CLOSE_WAIT",
 128        "LAST_ACK",
 129        "LISTEN",
 130        "CLOSING"
 131};
 132
 133typedef enum {
 134        SS_FREE = 0,     /* not allocated                */
 135        SS_UNCONNECTED,  /* unconnected to any socket    */
 136        SS_CONNECTING,   /* in process of connecting     */
 137        SS_CONNECTED,    /* connected to socket          */
 138        SS_DISCONNECTING /* in process of disconnecting  */
 139} socket_state;
 140
 141#define SO_ACCEPTCON (1<<16)  /* performed a listen           */
 142#define SO_WAITDATA  (1<<17)  /* wait data to read            */
 143#define SO_NOSPACE   (1<<18)  /* no space to write            */
 144
 145#define ADDR_NORMAL_WIDTH        23
 146/* When there are IPv6 connections the IPv6 addresses will be
 147 * truncated to none-recognition. The '-W' option makes the
 148 * address columns wide enough to accommodate for longest possible
 149 * IPv6 addresses, i.e. addresses of the form
 150 * xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd
 151 */
 152#define ADDR_WIDE                51  /* INET6_ADDRSTRLEN + 5 for the port number */
 153#if ENABLE_FEATURE_NETSTAT_WIDE
 154# define FMT_NET_CONN_DATA       "%s   %6lu %6lu %-*s %-*s %-12s"
 155# define FMT_NET_CONN_HEADER     "\nProto Recv-Q Send-Q %-*s %-*s State       %s\n"
 156#else
 157# define FMT_NET_CONN_DATA       "%s   %6lu %6lu %-23s %-23s %-12s"
 158# define FMT_NET_CONN_HEADER     "\nProto Recv-Q Send-Q %-23s %-23s State       %s\n"
 159#endif
 160
 161#define PROGNAME_WIDTH     20
 162#define PROGNAME_WIDTH_STR "20"
 163/* PROGNAME_WIDTH chars: 12345678901234567890 */
 164#define PROGNAME_BANNER "PID/Program name    "
 165
 166struct prg_node {
 167        struct prg_node *next;
 168        long inode;
 169        char name[PROGNAME_WIDTH];
 170};
 171
 172#define PRG_HASH_SIZE 211
 173
 174struct globals {
 175        smallint flags;
 176#if ENABLE_FEATURE_NETSTAT_PRG
 177        smallint prg_cache_loaded;
 178        struct prg_node *prg_hash[PRG_HASH_SIZE];
 179#endif
 180#if ENABLE_FEATURE_NETSTAT_PRG
 181        const char *progname_banner;
 182#endif
 183#if ENABLE_FEATURE_NETSTAT_WIDE
 184        unsigned addr_width;
 185#endif
 186};
 187#define G (*ptr_to_globals)
 188#define flags            (G.flags           )
 189#define prg_cache_loaded (G.prg_cache_loaded)
 190#define prg_hash         (G.prg_hash        )
 191#if ENABLE_FEATURE_NETSTAT_PRG
 192# define progname_banner (G.progname_banner )
 193#else
 194# define progname_banner ""
 195#endif
 196#define INIT_G() do { \
 197        SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 198        flags = NETSTAT_CONNECTED | NETSTAT_ALLPROTO; \
 199} while (0)
 200
 201
 202#if ENABLE_FEATURE_NETSTAT_PRG
 203
 204/* Deliberately truncating long to unsigned *int* */
 205#define PRG_HASHIT(x) ((unsigned)(x) % PRG_HASH_SIZE)
 206
 207static void prg_cache_add(long inode, char *name)
 208{
 209        unsigned hi = PRG_HASHIT(inode);
 210        struct prg_node **pnp, *pn;
 211
 212        prg_cache_loaded = 2;
 213        for (pnp = prg_hash + hi; (pn = *pnp) != NULL; pnp = &pn->next) {
 214                if (pn->inode == inode) {
 215                        /* Some warning should be appropriate here
 216                         * as we got multiple processes for one i-node */
 217                        return;
 218                }
 219        }
 220        *pnp = xzalloc(sizeof(struct prg_node));
 221        pn = *pnp;
 222        pn->inode = inode;
 223        safe_strncpy(pn->name, name, PROGNAME_WIDTH);
 224}
 225
 226static const char *prg_cache_get(long inode)
 227{
 228        unsigned hi = PRG_HASHIT(inode);
 229        struct prg_node *pn;
 230
 231        for (pn = prg_hash[hi]; pn; pn = pn->next)
 232                if (pn->inode == inode)
 233                        return pn->name;
 234        return "-";
 235}
 236
 237#if ENABLE_FEATURE_CLEAN_UP
 238static void prg_cache_clear(void)
 239{
 240        struct prg_node **pnp, *pn;
 241
 242        for (pnp = prg_hash; pnp < prg_hash + PRG_HASH_SIZE; pnp++) {
 243                while ((pn = *pnp) != NULL) {
 244                        *pnp = pn->next;
 245                        free(pn);
 246                }
 247        }
 248}
 249#else
 250#define prg_cache_clear() ((void)0)
 251#endif
 252
 253static long extract_socket_inode(const char *lname)
 254{
 255        long inode = -1;
 256
 257        if (is_prefixed_with(lname, "socket:[")) {
 258                /* "socket:[12345]", extract the "12345" as inode */
 259                inode = bb_strtoul(lname + sizeof("socket:[")-1, (char**)&lname, 0);
 260                if (*lname != ']')
 261                        inode = -1;
 262        } else if (is_prefixed_with(lname, "[0000]:")) {
 263                /* "[0000]:12345", extract the "12345" as inode */
 264                inode = bb_strtoul(lname + sizeof("[0000]:")-1, NULL, 0);
 265                if (errno) /* not NUL terminated? */
 266                        inode = -1;
 267        }
 268
 269#if 0 /* bb_strtol returns all-ones bit pattern on ERANGE anyway */
 270        if (errno == ERANGE)
 271                inode = -1;
 272#endif
 273        return inode;
 274}
 275
 276static int FAST_FUNC add_to_prg_cache_if_socket(const char *fileName,
 277                struct stat *statbuf UNUSED_PARAM,
 278                void *pid_slash_progname,
 279                int depth UNUSED_PARAM)
 280{
 281        char *linkname;
 282        long inode;
 283
 284        linkname = xmalloc_readlink(fileName);
 285        if (linkname != NULL) {
 286                inode = extract_socket_inode(linkname);
 287                free(linkname);
 288                if (inode >= 0)
 289                        prg_cache_add(inode, (char *)pid_slash_progname);
 290        }
 291        return TRUE;
 292}
 293
 294static int FAST_FUNC dir_act(const char *fileName,
 295                struct stat *statbuf UNUSED_PARAM,
 296                void *userData UNUSED_PARAM,
 297                int depth)
 298{
 299        const char *pid;
 300        char *pid_slash_progname;
 301        char proc_pid_fname[sizeof("/proc/%u/cmdline") + sizeof(long)*3];
 302        char cmdline_buf[512];
 303        int n, len;
 304
 305        if (depth == 0) /* "/proc" itself */
 306                return TRUE; /* continue looking one level below /proc */
 307
 308        pid = fileName + sizeof("/proc/")-1; /* point after "/proc/" */
 309        if (!isdigit(pid[0])) /* skip /proc entries which aren't processes */
 310                return SKIP;
 311
 312        len = snprintf(proc_pid_fname, sizeof(proc_pid_fname), "%s/cmdline", fileName);
 313        n = open_read_close(proc_pid_fname, cmdline_buf, sizeof(cmdline_buf) - 1);
 314        if (n < 0)
 315                return FALSE;
 316        cmdline_buf[n] = '\0';
 317
 318        /* go through all files in /proc/PID/fd and check whether they are sockets */
 319        strcpy(proc_pid_fname + len - (sizeof("cmdline")-1), "fd");
 320        pid_slash_progname = concat_path_file(pid, bb_basename(cmdline_buf)); /* "PID/argv0" */
 321        n = recursive_action(proc_pid_fname,
 322                        ACTION_RECURSE | ACTION_QUIET,
 323                        add_to_prg_cache_if_socket,
 324                        NULL,
 325                        (void *)pid_slash_progname,
 326                        0);
 327        free(pid_slash_progname);
 328
 329        if (!n)
 330                return FALSE; /* signal permissions error to caller */
 331
 332        return SKIP; /* caller should not recurse further into this dir */
 333}
 334
 335static void prg_cache_load(void)
 336{
 337        int load_ok;
 338
 339        prg_cache_loaded = 1;
 340        load_ok = recursive_action("/proc", ACTION_RECURSE | ACTION_QUIET,
 341                                NULL, dir_act, NULL, 0);
 342        if (load_ok)
 343                return;
 344
 345        if (prg_cache_loaded == 1)
 346                bb_error_msg("can't scan /proc - are you root?");
 347        else
 348                bb_error_msg("showing only processes with your user ID");
 349}
 350
 351#else
 352
 353#define prg_cache_clear()       ((void)0)
 354
 355#endif //ENABLE_FEATURE_NETSTAT_PRG
 356
 357
 358#if ENABLE_FEATURE_IPV6
 359static void build_ipv6_addr(char* local_addr, struct sockaddr_in6* localaddr)
 360{
 361        char addr6[INET6_ADDRSTRLEN];
 362        struct in6_addr in6;
 363
 364        sscanf(local_addr, "%08X%08X%08X%08X",
 365                   &in6.s6_addr32[0], &in6.s6_addr32[1],
 366                   &in6.s6_addr32[2], &in6.s6_addr32[3]);
 367        inet_ntop(AF_INET6, &in6, addr6, sizeof(addr6));
 368        inet_pton(AF_INET6, addr6, &localaddr->sin6_addr);
 369
 370        localaddr->sin6_family = AF_INET6;
 371}
 372#endif
 373
 374static void build_ipv4_addr(char* local_addr, struct sockaddr_in* localaddr)
 375{
 376        sscanf(local_addr, "%X", &localaddr->sin_addr.s_addr);
 377        localaddr->sin_family = AF_INET;
 378}
 379
 380static const char *get_sname(int port, const char *proto, int numeric)
 381{
 382        if (!port)
 383                return "*";
 384        if (!numeric) {
 385                struct servent *se = getservbyport(port, proto);
 386                if (se)
 387                        return se->s_name;
 388        }
 389        /* hummm, we may return static buffer here!! */
 390        return itoa(ntohs(port));
 391}
 392
 393static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
 394{
 395        char *host, *host_port;
 396
 397        /* Code which used "*" for INADDR_ANY is removed: it's ambiguous
 398         * in IPv6, while "0.0.0.0" is not. */
 399
 400        host = NULL;
 401        if (!numeric)
 402                host = xmalloc_sockaddr2host_noport(addr);
 403        if (!host)
 404                host = xmalloc_sockaddr2dotted_noport(addr);
 405
 406        host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
 407        free(host);
 408        return host_port;
 409}
 410
 411struct inet_params {
 412        int local_port, rem_port, state, uid;
 413        union {
 414                struct sockaddr     sa;
 415                struct sockaddr_in  sin;
 416#if ENABLE_FEATURE_IPV6
 417                struct sockaddr_in6 sin6;
 418#endif
 419        } localaddr, remaddr;
 420        unsigned long rxq, txq, inode;
 421};
 422
 423static int scan_inet_proc_line(struct inet_params *param, char *line)
 424{
 425        int num;
 426        /* IPv6 /proc files use 32-char hex representation
 427         * of IPv6 address, followed by :PORT_IN_HEX
 428         */
 429        char local_addr[33], rem_addr[33]; /* 32 + 1 for NUL */
 430
 431        num = sscanf(line,
 432                        "%*d: %32[0-9A-Fa-f]:%X "
 433                        "%32[0-9A-Fa-f]:%X %X "
 434                        "%lX:%lX %*X:%*X "
 435                        "%*X %d %*d %lu ",
 436                        local_addr, &param->local_port,
 437                        rem_addr, &param->rem_port, &param->state,
 438                        &param->txq, &param->rxq,
 439                        &param->uid, &param->inode);
 440        if (num < 9) {
 441                return 1; /* error */
 442        }
 443
 444        if (strlen(local_addr) > 8) {
 445#if ENABLE_FEATURE_IPV6
 446                build_ipv6_addr(local_addr, &param->localaddr.sin6);
 447                build_ipv6_addr(rem_addr, &param->remaddr.sin6);
 448#endif
 449        } else {
 450                build_ipv4_addr(local_addr, &param->localaddr.sin);
 451                build_ipv4_addr(rem_addr, &param->remaddr.sin);
 452        }
 453        return 0;
 454}
 455
 456static void print_inet_line(struct inet_params *param,
 457                const char *state_str, const char *proto, int is_connected)
 458{
 459        if ((is_connected && (flags & NETSTAT_CONNECTED))
 460         || (!is_connected && (flags & NETSTAT_LISTENING))
 461        ) {
 462                char *l = ip_port_str(
 463                                &param->localaddr.sa, param->local_port,
 464                                proto, flags & NETSTAT_NUMERIC);
 465                char *r = ip_port_str(
 466                                &param->remaddr.sa, param->rem_port,
 467                                proto, flags & NETSTAT_NUMERIC);
 468                printf(FMT_NET_CONN_DATA,
 469                        proto, param->rxq, param->txq,
 470                        IF_FEATURE_NETSTAT_WIDE(G.addr_width,) l,
 471                        IF_FEATURE_NETSTAT_WIDE(G.addr_width,) r,
 472                        state_str);
 473#if ENABLE_FEATURE_NETSTAT_PRG
 474                if (option_mask32 & OPT_prg)
 475                        printf("%."PROGNAME_WIDTH_STR"s", prg_cache_get(param->inode));
 476#endif
 477                bb_putchar('\n');
 478                free(l);
 479                free(r);
 480        }
 481}
 482
 483static int FAST_FUNC tcp_do_one(char *line)
 484{
 485        struct inet_params param;
 486
 487        memset(&param, 0, sizeof(param));
 488        if (scan_inet_proc_line(&param, line))
 489                return 1;
 490
 491        print_inet_line(&param, tcp_state[param.state], "tcp", param.rem_port);
 492        return 0;
 493}
 494
 495#if ENABLE_FEATURE_IPV6
 496# define NOT_NULL_ADDR(A) ( \
 497        ( (A.sa.sa_family == AF_INET6) \
 498          && (A.sin6.sin6_addr.s6_addr32[0] | A.sin6.sin6_addr.s6_addr32[1] | \
 499              A.sin6.sin6_addr.s6_addr32[2] | A.sin6.sin6_addr.s6_addr32[3])  \
 500        ) || ( \
 501          (A.sa.sa_family == AF_INET) \
 502          && A.sin.sin_addr.s_addr != 0 \
 503        ) \
 504)
 505#else
 506# define NOT_NULL_ADDR(A) (A.sin.sin_addr.s_addr)
 507#endif
 508
 509static int FAST_FUNC udp_do_one(char *line)
 510{
 511        int have_remaddr;
 512        const char *state_str;
 513        struct inet_params param;
 514
 515        memset(&param, 0, sizeof(param)); /* otherwise we display garbage IPv6 scope_ids */
 516        if (scan_inet_proc_line(&param, line))
 517                return 1;
 518
 519        state_str = "UNKNOWN";
 520        switch (param.state) {
 521        case TCP_ESTABLISHED:
 522                state_str = "ESTABLISHED";
 523                break;
 524        case TCP_CLOSE:
 525                state_str = "";
 526                break;
 527        }
 528
 529        have_remaddr = NOT_NULL_ADDR(param.remaddr);
 530        print_inet_line(&param, state_str, "udp", have_remaddr);
 531        return 0;
 532}
 533
 534static int FAST_FUNC raw_do_one(char *line)
 535{
 536        int have_remaddr;
 537        struct inet_params param;
 538
 539        if (scan_inet_proc_line(&param, line))
 540                return 1;
 541
 542        have_remaddr = NOT_NULL_ADDR(param.remaddr);
 543        print_inet_line(&param, itoa(param.state), "raw", have_remaddr);
 544        return 0;
 545}
 546
 547static int FAST_FUNC unix_do_one(char *line)
 548{
 549        unsigned long refcnt, proto, unix_flags;
 550        unsigned long inode;
 551        int type, state;
 552        int num, path_ofs;
 553        const char *ss_proto, *ss_state, *ss_type;
 554        char ss_flags[32];
 555
 556        /* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
 557         * Other users report long lines filled by NUL bytes.
 558         * (those ^@ are NUL bytes too). We see them as empty lines. */
 559        if (!line[0])
 560                return 0;
 561
 562        path_ofs = 0; /* paranoia */
 563        num = sscanf(line, "%*p: %lX %lX %lX %X %X %lu %n",
 564                        &refcnt, &proto, &unix_flags, &type, &state, &inode, &path_ofs);
 565        if (num < 6) {
 566                return 1; /* error */
 567        }
 568        if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) != (NETSTAT_LISTENING|NETSTAT_CONNECTED)) {
 569                if ((state == SS_UNCONNECTED) && (unix_flags & SO_ACCEPTCON)) {
 570                        if (!(flags & NETSTAT_LISTENING))
 571                                return 0;
 572                } else {
 573                        if (!(flags & NETSTAT_CONNECTED))
 574                                return 0;
 575                }
 576        }
 577
 578        switch (proto) {
 579                case 0:
 580                        ss_proto = "unix";
 581                        break;
 582                default:
 583                        ss_proto = "??";
 584        }
 585
 586        switch (type) {
 587                case SOCK_STREAM:
 588                        ss_type = "STREAM";
 589                        break;
 590                case SOCK_DGRAM:
 591                        ss_type = "DGRAM";
 592                        break;
 593                case SOCK_RAW:
 594                        ss_type = "RAW";
 595                        break;
 596                case SOCK_RDM:
 597                        ss_type = "RDM";
 598                        break;
 599                case SOCK_SEQPACKET:
 600                        ss_type = "SEQPACKET";
 601                        break;
 602                default:
 603                        ss_type = "UNKNOWN";
 604        }
 605
 606        switch (state) {
 607                case SS_FREE:
 608                        ss_state = "FREE";
 609                        break;
 610                case SS_UNCONNECTED:
 611                        /*
 612                         * Unconnected sockets may be listening
 613                         * for something.
 614                         */
 615                        if (unix_flags & SO_ACCEPTCON) {
 616                                ss_state = "LISTENING";
 617                        } else {
 618                                ss_state = "";
 619                        }
 620                        break;
 621                case SS_CONNECTING:
 622                        ss_state = "CONNECTING";
 623                        break;
 624                case SS_CONNECTED:
 625                        ss_state = "CONNECTED";
 626                        break;
 627                case SS_DISCONNECTING:
 628                        ss_state = "DISCONNECTING";
 629                        break;
 630                default:
 631                        ss_state = "UNKNOWN";
 632        }
 633
 634        strcpy(ss_flags, "[ ");
 635        if (unix_flags & SO_ACCEPTCON)
 636                strcat(ss_flags, "ACC ");
 637        if (unix_flags & SO_WAITDATA)
 638                strcat(ss_flags, "W ");
 639        if (unix_flags & SO_NOSPACE)
 640                strcat(ss_flags, "N ");
 641        strcat(ss_flags, "]");
 642
 643        printf("%-5s %-6lu %-11s %-10s %-13s %6lu ",
 644                ss_proto, refcnt, ss_flags, ss_type, ss_state, inode
 645                );
 646
 647#if ENABLE_FEATURE_NETSTAT_PRG
 648        if (option_mask32 & OPT_prg)
 649                printf("%-"PROGNAME_WIDTH_STR"s", prg_cache_get(inode));
 650#endif
 651
 652        /* TODO: currently we stop at first NUL byte. Is it a problem? */
 653        line += path_ofs;
 654        chomp(line);
 655        while (*line)
 656                fputc_printable(*line++, stdout);
 657        bb_putchar('\n');
 658        return 0;
 659}
 660
 661static void do_info(const char *file, int FAST_FUNC (*proc)(char *))
 662{
 663        int lnr;
 664        FILE *procinfo;
 665        char *buffer;
 666
 667        /* _stdin is just to save "r" param */
 668        procinfo = fopen_or_warn_stdin(file);
 669        if (procinfo == NULL) {
 670                return;
 671        }
 672        lnr = 0;
 673        /* Why xmalloc_fgets_str? because it doesn't stop on NULs */
 674        while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
 675                /* line 0 is skipped */
 676                if (lnr && proc(buffer))
 677                        bb_error_msg("%s: bogus data on line %d", file, lnr + 1);
 678                lnr++;
 679                free(buffer);
 680        }
 681        fclose(procinfo);
 682}
 683
 684int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 685int netstat_main(int argc UNUSED_PARAM, char **argv)
 686{
 687        unsigned opt;
 688
 689        INIT_G();
 690
 691        /* Option string must match NETSTAT_xxx constants */
 692        opt = getopt32(argv, NETSTAT_OPTS);
 693        if (opt & OPT_sock_listen) { // -l
 694                flags &= ~NETSTAT_CONNECTED;
 695                flags |= NETSTAT_LISTENING;
 696        }
 697        if (opt & OPT_sock_all) flags |= NETSTAT_LISTENING | NETSTAT_CONNECTED; // -a
 698        //if (opt & OPT_extended) // -e
 699        if (opt & OPT_noresolve) flags |= NETSTAT_NUMERIC; // -n
 700        //if (opt & OPT_sock_tcp) // -t: NETSTAT_TCP
 701        //if (opt & OPT_sock_udp) // -u: NETSTAT_UDP
 702        //if (opt & OPT_sock_raw) // -w: NETSTAT_RAW
 703        //if (opt & OPT_sock_unix) // -x: NETSTAT_UNIX
 704#if ENABLE_ROUTE
 705        if (opt & OPT_route) { // -r
 706                bb_displayroutes(flags & NETSTAT_NUMERIC, !(opt & OPT_extended));
 707                return 0;
 708        }
 709#endif
 710#if ENABLE_FEATURE_NETSTAT_WIDE
 711        G.addr_width = ADDR_NORMAL_WIDTH;
 712        if (opt & OPT_wide) { // -W
 713                G.addr_width = ADDR_WIDE;
 714        }
 715#endif
 716#if ENABLE_FEATURE_NETSTAT_PRG
 717        progname_banner = "";
 718        if (opt & OPT_prg) { // -p
 719                progname_banner = PROGNAME_BANNER;
 720                prg_cache_load();
 721        }
 722#endif
 723
 724        opt &= NETSTAT_ALLPROTO;
 725        if (opt) {
 726                flags &= ~NETSTAT_ALLPROTO;
 727                flags |= opt;
 728        }
 729        if (flags & (NETSTAT_TCP|NETSTAT_UDP|NETSTAT_RAW)) {
 730                printf("Active Internet connections "); /* xxx */
 731
 732                if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
 733                        printf("(servers and established)");
 734                else if (flags & NETSTAT_LISTENING)
 735                        printf("(only servers)");
 736                else
 737                        printf("(w/o servers)");
 738                printf(FMT_NET_CONN_HEADER,
 739                                IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Local Address",
 740                                IF_FEATURE_NETSTAT_WIDE(G.addr_width,) "Foreign Address",
 741                                progname_banner
 742                );
 743        }
 744        if (flags & NETSTAT_TCP) {
 745                do_info("/proc/net/tcp", tcp_do_one);
 746#if ENABLE_FEATURE_IPV6
 747                do_info("/proc/net/tcp6", tcp_do_one);
 748#endif
 749        }
 750        if (flags & NETSTAT_UDP) {
 751                do_info("/proc/net/udp", udp_do_one);
 752#if ENABLE_FEATURE_IPV6
 753                do_info("/proc/net/udp6", udp_do_one);
 754#endif
 755        }
 756        if (flags & NETSTAT_RAW) {
 757                do_info("/proc/net/raw", raw_do_one);
 758#if ENABLE_FEATURE_IPV6
 759                do_info("/proc/net/raw6", raw_do_one);
 760#endif
 761        }
 762        if (flags & NETSTAT_UNIX) {
 763                printf("Active UNIX domain sockets ");
 764                if ((flags & (NETSTAT_LISTENING|NETSTAT_CONNECTED)) == (NETSTAT_LISTENING|NETSTAT_CONNECTED))
 765                        printf("(servers and established)");
 766                else if (flags & NETSTAT_LISTENING)
 767                        printf("(only servers)");
 768                else
 769                        printf("(w/o servers)");
 770                printf("\nProto RefCnt Flags       Type       State         I-Node %sPath\n", progname_banner);
 771                do_info("/proc/net/unix", unix_do_one);
 772        }
 773        prg_cache_clear();
 774        return 0;
 775}
 776