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