ss.c

linux下 ss -i 可显示rto.
how to display tcp rto

http://linuxaleph.blogspot.com/2013/07/how-to-display-tcp-rto.html
   1 /*
   2  * ss.c        "sockstat", socket statistics
   3  *
   4  *        This program is free software; you can redistribute it and/or
   5  *        modify it under the terms of the GNU General Public License
   6  *        as published by the Free Software Foundation; either version
   7  *        2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:    Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  */
  11 
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <syslog.h>
  16 #include <fcntl.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/socket.h>
  19 #include <sys/uio.h>
  20 #include <netinet/in.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <netdb.h>
  24 #include <arpa/inet.h>
  25 #include <resolv.h>
  26 #include <dirent.h>
  27 #include <fnmatch.h>
  28 #include <getopt.h>
  29 
  30 #include "utils.h"
  31 #include "rt_names.h"
  32 #include "ll_map.h"
  33 #include "libnetlink.h"
  34 #include "SNAPSHOT.h"
  35 
  36 #include <netinet/tcp.h>
  37 #include <linux/inet_diag.h>
  38 
  39 int resolve_hosts = 0;
  40 int resolve_services = 1;
  41 int preferred_family = AF_UNSPEC;
  42 int show_options = 0;
  43 int show_details = 0;
  44 int show_users = 0;
  45 int show_mem = 0;
  46 int show_tcpinfo = 0;
  47 
  48 int netid_width;
  49 int state_width;
  50 int addrp_width;
  51 int addr_width;
  52 int serv_width;
  53 int screen_width;
  54 
  55 static const char *TCP_PROTO = "tcp";
  56 static const char *UDP_PROTO = "udp";
  57 static const char *RAW_PROTO = "raw";
  58 static const char *dg_proto = NULL;
  59 
  60 enum
  61 {
  62     TCP_DB,
  63     DCCP_DB,
  64     UDP_DB,
  65     RAW_DB,
  66     UNIX_DG_DB,
  67     UNIX_ST_DB,
  68     PACKET_DG_DB,
  69     PACKET_R_DB,
  70     NETLINK_DB,
  71     MAX_DB
  72 };
  73 
  74 #define PACKET_DBM ((1<<PACKET_DG_DB)|(1<<PACKET_R_DB))
  75 #define UNIX_DBM ((1<<UNIX_DG_DB)|(1<<UNIX_ST_DB))
  76 #define ALL_DB ((1<<MAX_DB)-1)
  77 
  78 enum {
  79     SS_UNKNOWN,
  80     SS_ESTABLISHED,
  81     SS_SYN_SENT,
  82     SS_SYN_RECV,
  83     SS_FIN_WAIT1,
  84     SS_FIN_WAIT2,
  85     SS_TIME_WAIT,
  86     SS_CLOSE,
  87     SS_CLOSE_WAIT,
  88     SS_LAST_ACK,
  89     SS_LISTEN,
  90     SS_CLOSING,
  91     SS_MAX
  92 };
  93 
  94 #define SS_ALL ((1<<SS_MAX)-1)
  95 
  96 #include "ssfilter.h"
  97 
  98 struct filter
  99 {
 100     int dbs;
 101     int states;
 102     int families;
 103     struct ssfilter *f;
 104 };
 105 
 106 struct filter default_filter = {
 107     .dbs    =  (1<<TCP_DB),
 108     .states = SS_ALL & ~((1<<SS_LISTEN)|(1<<SS_CLOSE)|(1<<SS_TIME_WAIT)|(1<<SS_SYN_RECV)),
 109     .families= (1<<AF_INET)|(1<<AF_INET6),
 110 };
 111 
 112 struct filter current_filter;
 113 
 114 static FILE *generic_proc_open(const char *env, const char *name)
 115 {
 116     const char *p = getenv(env);
 117     char store[128];
 118 
 119     if (!p) {
 120         p = getenv("PROC_ROOT") ? : "/proc";
 121         snprintf(store, sizeof(store)-1, "%s/%s", p, name);
 122         p = store;
 123     }
 124 
 125     return fopen(p, "r");
 126 }
 127 
 128 static FILE *net_tcp_open(void)
 129 {
 130     return generic_proc_open("PROC_NET_TCP", "net/tcp");
 131 }
 132 
 133 static FILE *net_tcp6_open(void)
 134 {
 135     return generic_proc_open("PROC_NET_TCP6", "net/tcp6");
 136 }
 137 
 138 static FILE *net_udp_open(void)
 139 {
 140     return generic_proc_open("PROC_NET_UDP", "net/udp");
 141 }
 142 
 143 static FILE *net_udp6_open(void)
 144 {
 145     return generic_proc_open("PROC_NET_UDP6", "net/udp6");
 146 }
 147 
 148 static FILE *net_raw_open(void)
 149 {
 150     return generic_proc_open("PROC_NET_RAW", "net/raw");
 151 }
 152 
 153 static FILE *net_raw6_open(void)
 154 {
 155     return generic_proc_open("PROC_NET_RAW6", "net/raw6");
 156 }
 157 
 158 static FILE *net_unix_open(void)
 159 {
 160     return generic_proc_open("PROC_NET_UNIX", "net/unix");
 161 }
 162 
 163 static FILE *net_packet_open(void)
 164 {
 165     return generic_proc_open("PROC_NET_PACKET", "net/packet");
 166 }
 167 
 168 static FILE *net_netlink_open(void)
 169 {
 170     return generic_proc_open("PROC_NET_NETLINK", "net/netlink");
 171 }
 172 
 173 static FILE *slabinfo_open(void)
 174 {
 175     return generic_proc_open("PROC_SLABINFO", "slabinfo");
 176 }
 177 
 178 static FILE *net_sockstat_open(void)
 179 {
 180     return generic_proc_open("PROC_NET_SOCKSTAT", "net/sockstat");
 181 }
 182 
 183 static FILE *net_sockstat6_open(void)
 184 {
 185     return generic_proc_open("PROC_NET_SOCKSTAT6", "net/sockstat6");
 186 }
 187 
 188 static FILE *net_snmp_open(void)
 189 {
 190     return generic_proc_open("PROC_NET_SNMP", "net/snmp");
 191 }
 192 
 193 static FILE *ephemeral_ports_open(void)
 194 {
 195     return generic_proc_open("PROC_IP_LOCAL_PORT_RANGE", "sys/net/ipv4/ip_local_port_range");
 196 }
 197 
 198 struct user_ent {
 199     struct user_ent    *next;
 200     unsigned int    ino;
 201     int        pid;
 202     int        fd;
 203     char        process[0];
 204 };
 205 
 206 #define USER_ENT_HASH_SIZE    256
 207 struct user_ent *user_ent_hash[USER_ENT_HASH_SIZE];
 208 
 209 static int user_ent_hashfn(unsigned int ino)
 210 {
 211     int val = (ino >> 24) ^ (ino >> 16) ^ (ino >> 8) ^ ino;
 212 
 213     return val & (USER_ENT_HASH_SIZE - 1);
 214 }
 215 
 216 static void user_ent_add(unsigned int ino, const char *process, int pid, int fd)
 217 {
 218     struct user_ent *p, **pp;
 219     int str_len;
 220 
 221     str_len = strlen(process) + 1;
 222     p = malloc(sizeof(struct user_ent) + str_len);
 223     if (!p)
 224         abort();
 225     p->next = NULL;
 226     p->ino = ino;
 227     p->pid = pid;
 228     p->fd = fd;
 229     strcpy(p->process, process);
 230 
 231     pp = &user_ent_hash[user_ent_hashfn(ino)];
 232     p->next = *pp;
 233     *pp = p;
 234 }
 235 
 236 static void user_ent_hash_build(void)
 237 {
 238     const char *root = getenv("PROC_ROOT") ? : "/proc/";
 239     struct dirent *d;
 240     char name[1024];
 241     int nameoff;
 242     DIR *dir;
 243 
 244     strcpy(name, root);
 245     if (strlen(name) == 0 || name[strlen(name)-1] != '/')
 246         strcat(name, "/");
 247 
 248     nameoff = strlen(name);
 249 
 250     dir = opendir(name);
 251     if (!dir)
 252         return;
 253 
 254     while ((d = readdir(dir)) != NULL) {
 255         struct dirent *d1;
 256         char process[16];
 257         int pid, pos;
 258         DIR *dir1;
 259         char crap;
 260 
 261         if (sscanf(d->d_name, "%d%c", &pid, &crap) != 1)
 262             continue;
 263 
 264         sprintf(name + nameoff, "%d/fd/", pid);
 265         pos = strlen(name);
 266         if ((dir1 = opendir(name)) == NULL)
 267             continue;
 268 
 269         process[0] = '';
 270 
 271         while ((d1 = readdir(dir1)) != NULL) {
 272             const char *pattern = "socket:[";
 273             unsigned int ino;
 274             char lnk[64];
 275             int fd;
 276 
 277             if (sscanf(d1->d_name, "%d%c", &fd, &crap) != 1)
 278                 continue;
 279 
 280             sprintf(name+pos, "%d", fd);
 281             if (readlink(name, lnk, sizeof(lnk)-1) < 0 ||
 282                 strncmp(lnk, pattern, strlen(pattern)))
 283                 continue;
 284 
 285             sscanf(lnk, "socket:[%u]", &ino);
 286 
 287             if (process[0] == '') {
 288                 char tmp[1024];
 289                 FILE *fp;
 290 
 291                 snprintf(tmp, sizeof(tmp), "%s/%d/stat", root, pid);
 292                 if ((fp = fopen(tmp, "r")) != NULL) {
 293                     fscanf(fp, "%*d (%[^)])", process);
 294                     fclose(fp);
 295                 }
 296             }
 297 
 298             user_ent_add(ino, process, pid, fd);
 299         }
 300         closedir(dir1);
 301     }
 302     closedir(dir);
 303 }
 304 
 305 int find_users(unsigned ino, char *buf, int buflen)
 306 {
 307     struct user_ent *p;
 308     int cnt = 0;
 309     char *ptr;
 310 
 311     if (!ino)
 312         return 0;
 313 
 314     p = user_ent_hash[user_ent_hashfn(ino)];
 315     ptr = buf;
 316     while (p) {
 317         if (p->ino != ino)
 318             goto next;
 319 
 320         if (ptr - buf >= buflen - 1)
 321             break;
 322 
 323         snprintf(ptr, buflen - (ptr - buf),
 324              "("%s",%d,%d),",
 325              p->process, p->pid, p->fd);
 326         ptr += strlen(ptr);
 327         cnt++;
 328 
 329     next:
 330         p = p->next;
 331     }
 332 
 333     if (ptr != buf)
 334         ptr[-1] = '';
 335 
 336     return cnt;
 337 }
 338 
 339 /* Get stats from slab */
 340 
 341 struct slabstat
 342 {
 343     int socks;
 344     int tcp_ports;
 345     int tcp_tws;
 346     int tcp_syns;
 347     int skbs;
 348 };
 349 
 350 struct slabstat slabstat;
 351 
 352 static const char *slabstat_ids[] =
 353 {
 354     "sock",
 355     "tcp_bind_bucket",
 356     "tcp_tw_bucket",
 357     "tcp_open_request",
 358     "skbuff_head_cache",
 359 };
 360 
 361 int get_slabstat(struct slabstat *s)
 362 {
 363     char buf[256];
 364     FILE *fp;
 365     int cnt;
 366 
 367     memset(s, 0, sizeof(*s));
 368 
 369     fp = slabinfo_open();
 370     if (!fp)
 371         return -1;
 372 
 373     cnt = sizeof(*s)/sizeof(int);
 374 
 375     fgets(buf, sizeof(buf), fp);
 376     while(fgets(buf, sizeof(buf), fp) != NULL) {
 377         int i;
 378         for (i=0; i<sizeof(slabstat_ids)/sizeof(slabstat_ids[0]); i++) {
 379             if (memcmp(buf, slabstat_ids[i], strlen(slabstat_ids[i])) == 0) {
 380                 sscanf(buf, "%*s%d", ((int *)s) + i);
 381                 cnt--;
 382                 break;
 383             }
 384         }
 385         if (cnt <= 0)
 386             break;
 387     }
 388 
 389     fclose(fp);
 390     return 0;
 391 }
 392 
 393 static const char *sstate_name[] = {
 394     "UNKNOWN",
 395     [TCP_ESTABLISHED] = "ESTAB",
 396     [TCP_SYN_SENT] = "SYN-SENT",
 397     [TCP_SYN_RECV] = "SYN-RECV",
 398     [TCP_FIN_WAIT1] = "FIN-WAIT-1",
 399     [TCP_FIN_WAIT2] = "FIN-WAIT-2",
 400     [TCP_TIME_WAIT] = "TIME-WAIT",
 401     [TCP_CLOSE] = "UNCONN",
 402     [TCP_CLOSE_WAIT] = "CLOSE-WAIT",
 403     [TCP_LAST_ACK] = "LAST-ACK",
 404     [TCP_LISTEN] =     "LISTEN",
 405     [TCP_CLOSING] = "CLOSING",
 406 };
 407 
 408 static const char *sstate_namel[] = {
 409     "UNKNOWN",
 410     [TCP_ESTABLISHED] = "established",
 411     [TCP_SYN_SENT] = "syn-sent",
 412     [TCP_SYN_RECV] = "syn-recv",
 413     [TCP_FIN_WAIT1] = "fin-wait-1",
 414     [TCP_FIN_WAIT2] = "fin-wait-2",
 415     [TCP_TIME_WAIT] = "time-wait",
 416     [TCP_CLOSE] = "unconnected",
 417     [TCP_CLOSE_WAIT] = "close-wait",
 418     [TCP_LAST_ACK] = "last-ack",
 419     [TCP_LISTEN] =     "listening",
 420     [TCP_CLOSING] = "closing",
 421 };
 422 
 423 struct tcpstat
 424 {
 425     inet_prefix    local;
 426     inet_prefix    remote;
 427     int        lport;
 428     int        rport;
 429     int        state;
 430     int        rq, wq;
 431     int        timer;
 432     int        timeout;
 433     int        retrs;
 434     unsigned    ino;
 435     int        probes;
 436     unsigned    uid;
 437     int        refcnt;
 438     unsigned long long sk;
 439     int        rto, ato, qack, cwnd, ssthresh;
 440 };
 441 
 442 static const char *tmr_name[] = {
 443     "off",
 444     "on",
 445     "keepalive",
 446     "timewait",
 447     "persist",
 448     "unknown"
 449 };
 450 
 451 const char *print_ms_timer(int timeout)
 452 {
 453     static char buf[64];
 454     int secs, msecs, minutes;
 455     if (timeout < 0)
 456         timeout = 0;
 457     secs = timeout/1000;
 458     minutes = secs/60;
 459     secs = secs%60;
 460     msecs = timeout%1000;
 461     buf[0] = 0;
 462     if (minutes) {
 463         msecs = 0;
 464         snprintf(buf, sizeof(buf)-16, "%dmin", minutes);
 465         if (minutes > 9)
 466             secs = 0;
 467     }
 468     if (secs) {
 469         if (secs > 9)
 470             msecs = 0;
 471         sprintf(buf+strlen(buf), "%d%s", secs, msecs ? "." : "sec");
 472     }
 473     if (msecs)
 474         sprintf(buf+strlen(buf), "%03dms", msecs);
 475     return buf;
 476 }
 477 
 478 const char *print_hz_timer(int timeout)
 479 {
 480     int hz = get_user_hz();
 481     return print_ms_timer(((timeout*1000) + hz-1)/hz);
 482 }
 483 
 484 struct scache
 485 {
 486     struct scache *next;
 487     int port;
 488     char *name;
 489     const char *proto;
 490 };
 491 
 492 struct scache *rlist;
 493 
 494 void init_service_resolver(void)
 495 {
 496     char buf[128];
 497     FILE *fp = popen("/usr/sbin/rpcinfo -p 2>/dev/null", "r");
 498     if (fp) {
 499         fgets(buf, sizeof(buf), fp);
 500         while (fgets(buf, sizeof(buf), fp) != NULL) {
 501             unsigned int progn, port;
 502             char proto[128], prog[128];
 503             if (sscanf(buf, "%u %*d %s %u %s", &progn, proto,
 504                    &port, prog+4) == 4) {
 505                 struct scache *c = malloc(sizeof(*c));
 506                 if (c) {
 507                     c->port = port;
 508                     memcpy(prog, "rpc.", 4);
 509                     c->name = strdup(prog);
 510                     if (strcmp(proto, TCP_PROTO) == 0)
 511                         c->proto = TCP_PROTO;
 512                     else if (strcmp(proto, UDP_PROTO) == 0)
 513                         c->proto = UDP_PROTO;
 514                     else
 515                         c->proto = NULL;
 516                     c->next = rlist;
 517                     rlist = c;
 518                 }
 519             }
 520         }
 521         pclose(fp);
 522     }
 523 }
 524 
 525 static int ip_local_port_min, ip_local_port_max;
 526 
 527 /* Even do not try default linux ephemeral port ranges:
 528  * default /etc/services contains so much of useless crap
 529  * wouldbe "allocated" to this area that resolution
 530  * is really harmful. I shrug each time when seeing
 531  * "socks" or "cfinger" in dumps.
 532  */
 533 static int is_ephemeral(int port)
 534 {
 535     if (!ip_local_port_min) {
 536         FILE *f = ephemeral_ports_open();
 537         if (f) {
 538             fscanf(f, "%d %d",
 539                    &ip_local_port_min, &ip_local_port_max);
 540             fclose(f);
 541         } else {
 542             ip_local_port_min = 1024;
 543             ip_local_port_max = 4999;
 544         }
 545     }
 546 
 547     return (port >= ip_local_port_min && port<= ip_local_port_max);
 548 }
 549 
 550 
 551 const char *__resolve_service(int port)
 552 {
 553     struct scache *c;
 554 
 555     for (c = rlist; c; c = c->next) {
 556         if (c->port == port && c->proto == dg_proto)
 557             return c->name;
 558     }
 559 
 560     if (!is_ephemeral(port)) {
 561         static int notfirst;
 562         struct servent *se;
 563         if (!notfirst) {
 564             setservent(1);
 565             notfirst = 1;
 566         }
 567         se = getservbyport(htons(port), dg_proto);
 568         if (se)
 569             return se->s_name;
 570     }
 571 
 572     return NULL;
 573 }
 574 
 575 
 576 const char *resolve_service(int port)
 577 {
 578     static char buf[128];
 579     static struct scache cache[256];
 580 
 581     if (port == 0) {
 582         buf[0] = '*';
 583         buf[1] = 0;
 584         return buf;
 585     }
 586 
 587     if (resolve_services) {
 588         if (dg_proto == RAW_PROTO) {
 589             return inet_proto_n2a(port, buf, sizeof(buf));
 590         } else {
 591             struct scache *c;
 592             const char *res;
 593             int hash = (port^(((unsigned long)dg_proto)>>2))&255;
 594 
 595             for (c = &cache[hash]; c; c = c->next) {
 596                 if (c->port == port &&
 597                     c->proto == dg_proto) {
 598                     if (c->name)
 599                         return c->name;
 600                     goto do_numeric;
 601                 }
 602             }
 603 
 604             if ((res = __resolve_service(port)) != NULL) {
 605                 if ((c = malloc(sizeof(*c))) == NULL)
 606                     goto do_numeric;
 607             } else {
 608                 c = &cache[hash];
 609                 if (c->name)
 610                     free(c->name);
 611             }
 612             c->port = port;
 613             c->name = NULL;
 614             c->proto = dg_proto;
 615             if (res) {
 616                 c->name = strdup(res);
 617                 c->next = cache[hash].next;
 618                 cache[hash].next = c;
 619             }
 620             if (c->name)
 621                 return c->name;
 622         }
 623     }
 624 
 625     do_numeric:
 626     sprintf(buf, "%u", port);
 627     return buf;
 628 }
 629 
 630 void formatted_print(const inet_prefix *a, int port)
 631 {
 632     char buf[1024];
 633     const char *ap = buf;
 634     int est_len;
 635 
 636     est_len = addr_width;
 637 
 638     if (a->family == AF_INET) {
 639         if (a->data[0] == 0) {
 640             buf[0] = '*';
 641             buf[1] = 0;
 642         } else {
 643             ap = format_host(AF_INET, 4, a->data, buf, sizeof(buf));
 644         }
 645     } else {
 646         ap = format_host(a->family, 16, a->data, buf, sizeof(buf));
 647         est_len = strlen(ap);
 648         if (est_len <= addr_width)
 649             est_len = addr_width;
 650         else
 651             est_len = addr_width + ((est_len-addr_width+3)/4)*4;
 652     }
 653     printf("%*s:%-*s ", est_len, ap, serv_width, resolve_service(port));
 654 }
 655 
 656 struct aafilter
 657 {
 658     inet_prefix    addr;
 659     int        port;
 660     struct aafilter *next;
 661 };
 662 
 663 int inet2_addr_match(const inet_prefix *a, const inet_prefix *p, int plen)
 664 {
 665     if (!inet_addr_match(a, p, plen))
 666         return 0;
 667 
 668     /* Cursed "v4 mapped" addresses: v4 mapped socket matches
 669      * pure IPv4 rule, but v4-mapped rule selects only v4-mapped
 670      * sockets. Fair? */
 671     if (p->family == AF_INET && a->family == AF_INET6) {
 672         if (a->data[0] == 0 && a->data[1] == 0 &&
 673             a->data[2] == htonl(0xffff)) {
 674             inet_prefix tmp = *a;
 675             tmp.data[0] = a->data[3];
 676             return inet_addr_match(&tmp, p, plen);
 677         }
 678     }
 679     return 1;
 680 }
 681 
 682 int unix_match(const inet_prefix *a, const inet_prefix *p)
 683 {
 684     char *addr, *pattern;
 685     memcpy(&addr, a->data, sizeof(addr));
 686     memcpy(&pattern, p->data, sizeof(pattern));
 687     if (pattern == NULL)
 688         return 1;
 689     if (addr == NULL)
 690         addr = "";
 691     return !fnmatch(pattern, addr, 0);
 692 }
 693 
 694 int run_ssfilter(struct ssfilter *f, struct tcpstat *s)
 695 {
 696     switch (f->type) {
 697         case SSF_S_AUTO:
 698     {
 699                 static int low, high=65535;
 700 
 701         if (s->local.family == AF_UNIX) {
 702             char *p;
 703             memcpy(&p, s->local.data, sizeof(p));
 704             return p == NULL || (p[0] == '@' && strlen(p) == 6 &&
 705                          strspn(p+1, "0123456789abcdef") == 5);
 706         }
 707         if (s->local.family == AF_PACKET)
 708             return s->lport == 0 && s->local.data == 0;
 709         if (s->local.family == AF_NETLINK)
 710             return s->lport < 0;
 711 
 712                 if (!low) {
 713             FILE *fp = ephemeral_ports_open();
 714             if (fp) {
 715                 fscanf(fp, "%d%d", &low, &high);
 716                 fclose(fp);
 717             }
 718         }
 719         return s->lport >= low && s->lport <= high;
 720     }
 721         case SSF_DCOND:
 722     {
 723         struct aafilter *a = (void*)f->pred;
 724         if (a->addr.family == AF_UNIX)
 725             return unix_match(&s->remote, &a->addr);
 726         if (a->port != -1 && a->port != s->rport)
 727             return 0;
 728         if (a->addr.bitlen) {
 729             do {
 730                 if (!inet2_addr_match(&s->remote, &a->addr, a->addr.bitlen))
 731                     return 1;
 732             } while ((a = a->next) != NULL);
 733             return 0;
 734         }
 735         return 1;
 736     }
 737         case SSF_SCOND:
 738     {
 739         struct aafilter *a = (void*)f->pred;
 740         if (a->addr.family == AF_UNIX)
 741             return unix_match(&s->local, &a->addr);
 742         if (a->port != -1 && a->port != s->lport)
 743             return 0;
 744         if (a->addr.bitlen) {
 745             do {
 746                 if (!inet2_addr_match(&s->local, &a->addr, a->addr.bitlen))
 747                     return 1;
 748             } while ((a = a->next) != NULL);
 749             return 0;
 750         }
 751         return 1;
 752     }
 753         case SSF_D_GE:
 754     {
 755         struct aafilter *a = (void*)f->pred;
 756         return s->rport >= a->port;
 757     }
 758         case SSF_D_LE:
 759     {
 760         struct aafilter *a = (void*)f->pred;
 761         return s->rport <= a->port;
 762     }
 763         case SSF_S_GE:
 764     {
 765         struct aafilter *a = (void*)f->pred;
 766         return s->lport >= a->port;
 767     }
 768         case SSF_S_LE:
 769     {
 770         struct aafilter *a = (void*)f->pred;
 771         return s->lport <= a->port;
 772     }
 773 
 774         /* Yup. It is recursion. Sorry. */
 775         case SSF_AND:
 776         return run_ssfilter(f->pred, s) && run_ssfilter(f->post, s);
 777         case SSF_OR:
 778         return run_ssfilter(f->pred, s) || run_ssfilter(f->post, s);
 779         case SSF_NOT:
 780         return !run_ssfilter(f->pred, s);
 781         default:
 782         abort();
 783     }
 784 }
 785 
 786 /* Relocate external jumps by reloc. */
 787 static void ssfilter_patch(char *a, int len, int reloc)
 788 {
 789     while (len > 0) {
 790         struct inet_diag_bc_op *op = (struct inet_diag_bc_op*)a;
 791         if (op->no == len+4)
 792             op->no += reloc;
 793         len -= op->yes;
 794         a += op->yes;
 795     }
 796     if (len < 0)
 797         abort();
 798 }
 799 
 800 static int ssfilter_bytecompile(struct ssfilter *f, char **bytecode)
 801 {
 802     switch (f->type) {
 803         case SSF_S_AUTO:
 804     {
 805         if (!(*bytecode=malloc(4))) abort();
 806         ((struct inet_diag_bc_op*)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_AUTO, 4, 8 };
 807         return 4;
 808     }
 809         case SSF_DCOND:
 810         case SSF_SCOND:
 811     {
 812         struct aafilter *a = (void*)f->pred;
 813         struct aafilter *b;
 814         char *ptr;
 815         int  code = (f->type == SSF_DCOND ? INET_DIAG_BC_D_COND : INET_DIAG_BC_S_COND);
 816         int len = 0;
 817 
 818         for (b=a; b; b=b->next) {
 819             len += 4 + sizeof(struct inet_diag_hostcond);
 820             if (a->addr.family == AF_INET6)
 821                 len += 16;
 822             else
 823                 len += 4;
 824             if (b->next)
 825                 len += 4;
 826         }
 827         if (!(ptr = malloc(len))) abort();
 828         *bytecode = ptr;
 829         for (b=a; b; b=b->next) {
 830             struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)ptr;
 831             int alen = (a->addr.family == AF_INET6 ? 16 : 4);
 832             int oplen = alen + 4 + sizeof(struct inet_diag_hostcond);
 833             struct inet_diag_hostcond *cond = (struct inet_diag_hostcond*)(ptr+4);
 834 
 835             *op = (struct inet_diag_bc_op){ code, oplen, oplen+4 };
 836             cond->family = a->addr.family;
 837             cond->port = a->port;
 838             cond->prefix_len = a->addr.bitlen;
 839             memcpy(cond->addr, a->addr.data, alen);
 840             ptr += oplen;
 841             if (b->next) {
 842                 op = (struct inet_diag_bc_op *)ptr;
 843                 *op = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, len - (ptr-*bytecode)};
 844                 ptr += 4;
 845             }
 846         }
 847         return ptr - *bytecode;
 848     }
 849         case SSF_D_GE:
 850     {
 851         struct aafilter *x = (void*)f->pred;
 852         if (!(*bytecode=malloc(8))) abort();
 853         ((struct inet_diag_bc_op*)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_D_GE, 8, 12 };
 854         ((struct inet_diag_bc_op*)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
 855         return 8;
 856     }
 857         case SSF_D_LE:
 858     {
 859         struct aafilter *x = (void*)f->pred;
 860         if (!(*bytecode=malloc(8))) abort();
 861         ((struct inet_diag_bc_op*)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_D_LE, 8, 12 };
 862         ((struct inet_diag_bc_op*)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
 863         return 8;
 864     }
 865         case SSF_S_GE:
 866     {
 867         struct aafilter *x = (void*)f->pred;
 868         if (!(*bytecode=malloc(8))) abort();
 869         ((struct inet_diag_bc_op*)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_S_GE, 8, 12 };
 870         ((struct inet_diag_bc_op*)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
 871         return 8;
 872     }
 873         case SSF_S_LE:
 874     {
 875         struct aafilter *x = (void*)f->pred;
 876         if (!(*bytecode=malloc(8))) abort();
 877         ((struct inet_diag_bc_op*)*bytecode)[0] = (struct inet_diag_bc_op){ INET_DIAG_BC_S_LE, 8, 12 };
 878         ((struct inet_diag_bc_op*)*bytecode)[1] = (struct inet_diag_bc_op){ 0, 0, x->port };
 879         return 8;
 880     }
 881 
 882         case SSF_AND:
 883     {
 884         char *a1, *a2, *a, l1, l2;
 885         l1 = ssfilter_bytecompile(f->pred, &a1);
 886         l2 = ssfilter_bytecompile(f->post, &a2);
 887         if (!(a = malloc(l1+l2))) abort();
 888         memcpy(a, a1, l1);
 889         memcpy(a+l1, a2, l2);
 890         free(a1); free(a2);
 891         ssfilter_patch(a, l1, l2);
 892         *bytecode = a;
 893         return l1+l2;
 894     }
 895         case SSF_OR:
 896     {
 897         char *a1, *a2, *a, l1, l2;
 898         l1 = ssfilter_bytecompile(f->pred, &a1);
 899         l2 = ssfilter_bytecompile(f->post, &a2);
 900         if (!(a = malloc(l1+l2+4))) abort();
 901         memcpy(a, a1, l1);
 902         memcpy(a+l1+4, a2, l2);
 903         free(a1); free(a2);
 904         *(struct inet_diag_bc_op*)(a+l1) = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, l2+4 };
 905         *bytecode = a;
 906         return l1+l2+4;
 907     }
 908         case SSF_NOT:
 909     {
 910         char *a1, *a, l1;
 911         l1 = ssfilter_bytecompile(f->pred, &a1);
 912         if (!(a = malloc(l1+4))) abort();
 913         memcpy(a, a1, l1);
 914         free(a1);
 915         *(struct inet_diag_bc_op*)(a+l1) = (struct inet_diag_bc_op){ INET_DIAG_BC_JMP, 4, 8 };
 916         *bytecode = a;
 917         return l1+4;
 918     }
 919         default:
 920         abort();
 921     }
 922 }
 923 
 924 static int remember_he(struct aafilter *a, struct hostent *he)
 925 {
 926     char **ptr = he->h_addr_list;
 927     int cnt = 0;
 928     int len;
 929 
 930     if (he->h_addrtype == AF_INET)
 931         len = 4;
 932     else if (he->h_addrtype == AF_INET6)
 933         len = 16;
 934     else
 935         return 0;
 936 
 937     while (*ptr) {
 938         struct aafilter *b = a;
 939         if (a->addr.bitlen) {
 940             if ((b = malloc(sizeof(*b))) == NULL)
 941                 return cnt;
 942             *b = *a;
 943             b->next = a->next;
 944             a->next = b;
 945         }
 946         memcpy(b->addr.data, *ptr, len);
 947         b->addr.bytelen = len;
 948         b->addr.bitlen = len*8;
 949         b->addr.family = he->h_addrtype;
 950         ptr++;
 951         cnt++;
 952     }
 953     return cnt;
 954 }
 955 
 956 static int get_dns_host(struct aafilter *a, const char *addr, int fam)
 957 {
 958     static int notfirst;
 959     int cnt = 0;
 960     struct hostent *he;
 961 
 962     a->addr.bitlen = 0;
 963     if (!notfirst) {
 964         sethostent(1);
 965         notfirst = 1;
 966     }
 967     he = gethostbyname2(addr, fam == AF_UNSPEC ? AF_INET : fam);
 968     if (he)
 969         cnt = remember_he(a, he);
 970     if (fam == AF_UNSPEC) {
 971         he = gethostbyname2(addr, AF_INET6);
 972         if (he)
 973             cnt += remember_he(a, he);
 974     }
 975     return !cnt;
 976 }
 977 
 978 static int xll_initted = 0;
 979 
 980 static void xll_init(void)
 981 {
 982     struct rtnl_handle rth;
 983     rtnl_open(&rth, 0);
 984     ll_init_map(&rth);
 985     rtnl_close(&rth);
 986     xll_initted = 1;
 987 }
 988 
 989 static const char *xll_index_to_name(int index)
 990 {
 991     if (!xll_initted)
 992         xll_init();
 993     return ll_index_to_name(index);
 994 }
 995 
 996 static int xll_name_to_index(const char *dev)
 997 {
 998     if (!xll_initted)
 999         xll_init();
1000     return ll_name_to_index(dev);
1001 }
1002 
1003 void *parse_hostcond(char *addr)
1004 {
1005     char *port = NULL;
1006     struct aafilter a;
1007     struct aafilter *res;
1008     int fam = preferred_family;
1009 
1010     memset(&a, 0, sizeof(a));
1011     a.port = -1;
1012 
1013     if (fam == AF_UNIX || strncmp(addr, "unix:", 5) == 0) {
1014         char *p;
1015         a.addr.family = AF_UNIX;
1016         if (strncmp(addr, "unix:", 5) == 0)
1017             addr+=5;
1018         p = strdup(addr);
1019         a.addr.bitlen = 8*strlen(p);
1020         memcpy(a.addr.data, &p, sizeof(p));
1021         goto out;
1022     }
1023 
1024     if (fam == AF_PACKET || strncmp(addr, "link:", 5) == 0) {
1025         a.addr.family = AF_PACKET;
1026         a.addr.bitlen = 0;
1027         if (strncmp(addr, "link:", 5) == 0)
1028             addr+=5;
1029         port = strchr(addr, ':');
1030         if (port) {
1031             *port = 0;
1032             if (port[1] && strcmp(port+1, "*")) {
1033                 if (get_integer(&a.port, port+1, 0)) {
1034                     if ((a.port = xll_name_to_index(port+1)) <= 0)
1035                         return NULL;
1036                 }
1037             }
1038         }
1039         if (addr[0] && strcmp(addr, "*")) {
1040             unsigned short tmp;
1041             a.addr.bitlen = 32;
1042             if (ll_proto_a2n(&tmp, addr))
1043                 return NULL;
1044             a.addr.data[0] = ntohs(tmp);
1045         }
1046         goto out;
1047     }
1048 
1049     if (fam == AF_NETLINK || strncmp(addr, "netlink:", 8) == 0) {
1050         a.addr.family = AF_NETLINK;
1051         a.addr.bitlen = 0;
1052         if (strncmp(addr, "netlink:", 8) == 0)
1053             addr+=8;
1054         port = strchr(addr, ':');
1055         if (port) {
1056             *port = 0;
1057             if (port[1] && strcmp(port+1, "*")) {
1058                 if (get_integer(&a.port, port+1, 0)) {
1059                     if (strcmp(port+1, "kernel") == 0)
1060                         a.port = 0;
1061                     else
1062                         return NULL;
1063                 }
1064             }
1065         }
1066         if (addr[0] && strcmp(addr, "*")) {
1067             a.addr.bitlen = 32;
1068             if (get_u32(a.addr.data, addr, 0)) {
1069                 if (strcmp(addr, "rtnl") == 0)
1070                     a.addr.data[0] = 0;
1071                 else if (strcmp(addr, "fw") == 0)
1072                     a.addr.data[0] = 3;
1073                 else if (strcmp(addr, "tcpdiag") == 0)
1074                     a.addr.data[0] = 4;
1075                 else
1076                     return NULL;
1077             }
1078         }
1079         goto out;
1080     }
1081 
1082     if (strncmp(addr, "inet:", 5) == 0) {
1083         addr += 5;
1084         fam = AF_INET;
1085     } else if (strncmp(addr, "inet6:", 6) == 0) {
1086         addr += 6;
1087         fam = AF_INET6;
1088     }
1089 
1090     /* URL-like literal [] */
1091     if (addr[0] == '[') {
1092         addr++;
1093         if ((port = strchr(addr, ']')) == NULL)
1094             return NULL;
1095         *port++ = 0;
1096     } else if (addr[0] == '*') {
1097         port = addr+1;
1098     } else {
1099         port = strrchr(strchr(addr, '/') ? : addr, ':');
1100     }
1101     if (port && *port) {
1102         if (*port != ':')
1103             return NULL;
1104         *port++ = 0;
1105         if (*port && *port != '*') {
1106             if (get_integer(&a.port, port, 0)) {
1107                 struct servent *se1 = NULL;
1108                 struct servent *se2 = NULL;
1109                 if (current_filter.dbs&(1<<UDP_DB))
1110                     se1 = getservbyname(port, UDP_PROTO);
1111                 if (current_filter.dbs&(1<<TCP_DB))
1112                     se2 = getservbyname(port, TCP_PROTO);
1113                 if (se1 && se2 && se1->s_port != se2->s_port) {
1114                     fprintf(stderr, "Error: ambiguous port "%s".
", port);
1115                     return NULL;
1116                 }
1117                 if (!se1)
1118                     se1 = se2;
1119                 if (se1) {
1120                     a.port = ntohs(se1->s_port);
1121                 } else {
1122                     struct scache *s;
1123                     for (s = rlist; s; s = s->next) {
1124                         if ((s->proto == UDP_PROTO &&
1125                              (current_filter.dbs&(1<<UDP_DB))) ||
1126                             (s->proto == TCP_PROTO &&
1127                              (current_filter.dbs&(1<<TCP_DB)))) {
1128                             if (s->name && strcmp(s->name, port) == 0) {
1129                                 if (a.port > 0 && a.port != s->port) {
1130                                     fprintf(stderr, "Error: ambiguous port "%s".
", port);
1131                                     return NULL;
1132                                 }
1133                                 a.port = s->port;
1134                             }
1135                         }
1136                     }
1137                     if (a.port <= 0) {
1138                         fprintf(stderr, "Error: "%s" does not look like a port.
", port);
1139                         return NULL;
1140                     }
1141                 }
1142             }
1143         }
1144     }
1145     if (addr && *addr && *addr != '*') {
1146         if (get_prefix_1(&a.addr, addr, fam)) {
1147             if (get_dns_host(&a, addr, fam)) {
1148                 fprintf(stderr, "Error: an inet prefix is expected rather than "%s".
", addr);
1149                 return NULL;
1150             }
1151         }
1152     }
1153 
1154     out:
1155     res = malloc(sizeof(*res));
1156     if (res)
1157         memcpy(res, &a, sizeof(a));
1158     return res;
1159 }
1160 
1161 static int tcp_show_line(char *line, const struct filter *f, int family)
1162 {
1163     struct tcpstat s;
1164     char *loc, *rem, *data;
1165     char opt[256];
1166     int n;
1167     char *p;
1168 
1169     if ((p = strchr(line, ':')) == NULL)
1170         return -1;
1171     loc = p+2;
1172 
1173     if ((p = strchr(loc, ':')) == NULL)
1174         return -1;
1175     p[5] = 0;
1176     rem = p+6;
1177 
1178     if ((p = strchr(rem, ':')) == NULL)
1179         return -1;
1180     p[5] = 0;
1181     data = p+6;
1182 
1183     do {
1184         int state = (data[1] >= 'A') ? (data[1] - 'A' + 10) : (data[1] - '0');
1185 
1186         if (!(f->states & (1<<state)))
1187             return 0;
1188     } while (0);
1189 
1190     s.local.family = s.remote.family = family;
1191     if (family == AF_INET) {
1192         sscanf(loc, "%x:%x", s.local.data, (unsigned*)&s.lport);
1193         sscanf(rem, "%x:%x", s.remote.data, (unsigned*)&s.rport);
1194         s.local.bytelen = s.remote.bytelen = 4;
1195     } else {
1196         sscanf(loc, "%08x%08x%08x%08x:%x",
1197                s.local.data,
1198                s.local.data+1,
1199                s.local.data+2,
1200                s.local.data+3,
1201                &s.lport);
1202         sscanf(rem, "%08x%08x%08x%08x:%x",
1203                s.remote.data,
1204                s.remote.data+1,
1205                s.remote.data+2,
1206                s.remote.data+3,
1207                &s.rport);
1208         s.local.bytelen = s.remote.bytelen = 16;
1209     }
1210 
1211     if (f->f && run_ssfilter(f->f, &s) == 0)
1212         return 0;
1213 
1214     opt[0] = 0;
1215     n = sscanf(data, "%x %x:%x %x:%x %x %d %d %u %d %llx %d %d %d %d %d %[^
]
",
1216            &s.state, &s.wq, &s.rq,
1217            &s.timer, &s.timeout, &s.retrs, &s.uid, &s.probes, &s.ino,
1218            &s.refcnt, &s.sk, &s.rto, &s.ato, &s.qack,
1219            &s.cwnd, &s.ssthresh, opt);
1220 
1221     if (n < 17)
1222         opt[0] = 0;
1223 
1224     if (n < 12) {
1225         s.rto = 0;
1226         s.cwnd = 2;
1227         s.ssthresh = -1;
1228         s.ato = s.qack = 0;
1229     }
1230 
1231     if (netid_width)
1232         printf("%-*s ", netid_width, "tcp");
1233     if (state_width)
1234         printf("%-*s ", state_width, sstate_name[s.state]);
1235 
1236     printf("%-6d %-6d ", s.rq, s.wq);
1237 
1238     formatted_print(&s.local, s.lport);
1239     formatted_print(&s.remote, s.rport);
1240 
1241     if (show_options) {
1242         if (s.timer) {
1243             if (s.timer > 4)
1244                 s.timer = 5;
1245             printf(" timer:(%s,%s,%d)",
1246                    tmr_name[s.timer],
1247                    print_hz_timer(s.timeout),
1248                    s.timer != 1 ? s.probes : s.retrs);
1249         }
1250     }
1251     if (show_tcpinfo) {
1252         int hz = get_user_hz();
1253         if (s.rto && s.rto != 3*hz)
1254             printf(" rto:%g", (double)s.rto/hz);
1255         if (s.ato)
1256             printf(" ato:%g", (double)s.ato/hz);
1257         if (s.cwnd != 2)
1258             printf(" cwnd:%d", s.cwnd);
1259         if (s.ssthresh != -1)
1260             printf(" ssthresh:%d", s.ssthresh);
1261         if (s.qack/2)
1262             printf(" qack:%d", s.qack/2);
1263         if (s.qack&1)
1264             printf(" bidir");
1265     }
1266     if (show_users) {
1267         char ubuf[4096];
1268         if (find_users(s.ino, ubuf, sizeof(ubuf)) > 0)
1269             printf(" users:(%s)", ubuf);
1270     }
1271     if (show_details) {
1272         if (s.uid)
1273             printf(" uid:%u", (unsigned)s.uid);
1274         printf(" ino:%u", s.ino);
1275         printf(" sk:%llx", s.sk);
1276         if (opt[0])
1277             printf(" opt:"%s"", opt);
1278     }
1279     printf("
");
1280 
1281     return 0;
1282 }
1283 
1284 static int generic_record_read(FILE *fp,
1285                    int (*worker)(char*, const struct filter *, int),
1286                    const struct filter *f, int fam)
1287 {
1288     char line[256];
1289 
1290     /* skip header */
1291     if (fgets(line, sizeof(line), fp) == NULL)
1292         goto outerr;
1293 
1294     while (fgets(line, sizeof(line), fp) != NULL) {
1295         int n = strlen(line);
1296         if (n == 0 || line[n-1] != '
') {
1297             errno = -EINVAL;
1298             return -1;
1299         }
1300         line[n-1] = 0;
1301 
1302         if (worker(line, f, fam) < 0)
1303             return 0;
1304     }
1305 outerr:
1306 
1307     return ferror(fp) ? -1 : 0;
1308 }
1309 
1310 static char *sprint_bw(char *buf, double bw)
1311 {
1312     if (bw > 1000000.)
1313         sprintf(buf,"%.1fM", bw / 1000000.);
1314     else if (bw > 1000.)
1315         sprintf(buf,"%.1fK", bw / 1000.);
1316     else
1317         sprintf(buf, "%g", bw);
1318 
1319     return buf;
1320 }
1321 
1322 static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r)
1323 {
1324     struct rtattr * tb[INET_DIAG_MAX+1];
1325     char b1[64];
1326     double rtt = 0;
1327 
1328     parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr*)(r+1),
1329              nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
1330 
1331     if (tb[INET_DIAG_MEMINFO]) {
1332         const struct inet_diag_meminfo *minfo
1333             = RTA_DATA(tb[INET_DIAG_MEMINFO]);
1334         printf(" mem:(r%u,w%u,f%u,t%u)",
1335                minfo->idiag_rmem,
1336                minfo->idiag_wmem,
1337                minfo->idiag_fmem,
1338                minfo->idiag_tmem);
1339     }
1340 
1341     if (tb[INET_DIAG_INFO]) {
1342         struct tcp_info *info;
1343         int len = RTA_PAYLOAD(tb[INET_DIAG_INFO]);
1344 
1345         /* workaround for older kernels with less fields */
1346         if (len < sizeof(*info)) {
1347             info = alloca(sizeof(*info));
1348             memset(info, 0, sizeof(*info));
1349             memcpy(info, RTA_DATA(tb[INET_DIAG_INFO]), len);
1350         } else
1351             info = RTA_DATA(tb[INET_DIAG_INFO]);
1352 
1353         if (show_options) {
1354             if (info->tcpi_options & TCPI_OPT_TIMESTAMPS)
1355                 printf(" ts");
1356             if (info->tcpi_options & TCPI_OPT_SACK)
1357                 printf(" sack");
1358             if (info->tcpi_options & TCPI_OPT_ECN)
1359                 printf(" ecn");
1360         }
1361 
1362         if (tb[INET_DIAG_CONG])
1363             printf(" %s", (char *) RTA_DATA(tb[INET_DIAG_CONG]));
1364 
1365         if (info->tcpi_options & TCPI_OPT_WSCALE)
1366             printf(" wscale:%d,%d", info->tcpi_snd_wscale,
1367                    info->tcpi_rcv_wscale);
1368         if (info->tcpi_rto && info->tcpi_rto != 3000000)
1369             printf(" rto:%g", (double)info->tcpi_rto/1000);
1370         if (info->tcpi_rtt)
1371             printf(" rtt:%g/%g", (double)info->tcpi_rtt/1000,
1372                    (double)info->tcpi_rttvar/1000);
1373         if (info->tcpi_ato)
1374             printf(" ato:%g", (double)info->tcpi_ato/1000);
1375         if (info->tcpi_snd_cwnd != 2)
1376             printf(" cwnd:%d", info->tcpi_snd_cwnd);
1377         if (info->tcpi_snd_ssthresh < 0xFFFF)
1378             printf(" ssthresh:%d", info->tcpi_snd_ssthresh);
1379 
1380         rtt = (double) info->tcpi_rtt;
1381         if (tb[INET_DIAG_VEGASINFO]) {
1382             const struct tcpvegas_info *vinfo
1383                 = RTA_DATA(tb[INET_DIAG_VEGASINFO]);
1384 
1385             if (vinfo->tcpv_enabled &&
1386                 vinfo->tcpv_rtt && vinfo->tcpv_rtt != 0x7fffffff)
1387                 rtt =  vinfo->tcpv_rtt;
1388         }
1389 
1390         if (rtt > 0 && info->tcpi_snd_mss && info->tcpi_snd_cwnd) {
1391             printf(" send %sbps",
1392                    sprint_bw(b1, (double) info->tcpi_snd_cwnd *
1393                      (double) info->tcpi_snd_mss * 8000000.
1394                      / rtt));
1395         }
1396 
1397         if (info->tcpi_rcv_rtt)
1398             printf(" rcv_rtt:%g", (double) info->tcpi_rcv_rtt/1000);
1399         if (info->tcpi_rcv_space)
1400             printf(" rcv_space:%d", info->tcpi_rcv_space);
1401 
1402     }
1403 }
1404 
1405 static int tcp_show_sock(struct nlmsghdr *nlh, struct filter *f)
1406 {
1407     struct inet_diag_msg *r = NLMSG_DATA(nlh);
1408     struct tcpstat s;
1409 
1410     s.state = r->idiag_state;
1411     s.local.family = s.remote.family = r->idiag_family;
1412     s.lport = ntohs(r->id.idiag_sport);
1413     s.rport = ntohs(r->id.idiag_dport);
1414     if (s.local.family == AF_INET) {
1415         s.local.bytelen = s.remote.bytelen = 4;
1416     } else {
1417         s.local.bytelen = s.remote.bytelen = 16;
1418     }
1419     memcpy(s.local.data, r->id.idiag_src, s.local.bytelen);
1420     memcpy(s.remote.data, r->id.idiag_dst, s.local.bytelen);
1421 
1422     if (f && f->f && run_ssfilter(f->f, &s) == 0)
1423         return 0;
1424 
1425     if (netid_width)
1426         printf("%-*s ", netid_width, "tcp");
1427     if (state_width)
1428         printf("%-*s ", state_width, sstate_name[s.state]);
1429 
1430     printf("%-6d %-6d ", r->idiag_rqueue, r->idiag_wqueue);
1431 
1432     formatted_print(&s.local, s.lport);
1433     formatted_print(&s.remote, s.rport);
1434 
1435     if (show_options) {
1436         if (r->idiag_timer) {
1437             if (r->idiag_timer > 4)
1438                 r->idiag_timer = 5;
1439             printf(" timer:(%s,%s,%d)",
1440                    tmr_name[r->idiag_timer],
1441                    print_ms_timer(r->idiag_expires),
1442                    r->idiag_retrans);
1443         }
1444     }
1445     if (show_users) {
1446         char ubuf[4096];
1447         if (find_users(r->idiag_inode, ubuf, sizeof(ubuf)) > 0)
1448             printf(" users:(%s)", ubuf);
1449     }
1450     if (show_details) {
1451         if (r->idiag_uid)
1452             printf(" uid:%u", (unsigned)r->idiag_uid);
1453         printf(" ino:%u", r->idiag_inode);
1454         printf(" sk:");
1455         if (r->id.idiag_cookie[1] != 0)
1456             printf("%08x", r->id.idiag_cookie[1]);
1457          printf("%08x", r->id.idiag_cookie[0]);
1458     }
1459     if (show_mem || show_tcpinfo) {
1460         printf("
	");
1461         tcp_show_info(nlh, r);
1462     }
1463 
1464     printf("
");
1465 
1466     return 0;
1467 }
1468 
1469 static int tcp_show_netlink(struct filter *f, FILE *dump_fp, int socktype)
1470 {
1471     int fd;
1472     struct sockaddr_nl nladdr;
1473     struct {
1474         struct nlmsghdr nlh;
1475         struct inet_diag_req r;
1476     } req;
1477     char    *bc = NULL;
1478     int    bclen;
1479     struct msghdr msg;
1480     struct rtattr rta;
1481     char    buf[8192];
1482     struct iovec iov[3];
1483 
1484     if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG)) < 0)
1485         return -1;
1486 
1487     memset(&nladdr, 0, sizeof(nladdr));
1488     nladdr.nl_family = AF_NETLINK;
1489 
1490     req.nlh.nlmsg_len = sizeof(req);
1491     req.nlh.nlmsg_type = socktype;
1492     req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
1493     req.nlh.nlmsg_pid = 0;
1494     req.nlh.nlmsg_seq = 123456;
1495     memset(&req.r, 0, sizeof(req.r));
1496     req.r.idiag_family = AF_INET;
1497     req.r.idiag_states = f->states;
1498     if (show_mem)
1499         req.r.idiag_ext |= (1<<(INET_DIAG_MEMINFO-1));
1500 
1501     if (show_tcpinfo) {
1502         req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
1503         req.r.idiag_ext |= (1<<(INET_DIAG_VEGASINFO-1));
1504         req.r.idiag_ext |= (1<<(INET_DIAG_CONG-1));
1505     }
1506 
1507     iov[0] = (struct iovec){
1508         .iov_base = &req,
1509         .iov_len = sizeof(req)
1510     };
1511     if (f->f) {
1512         bclen = ssfilter_bytecompile(f->f, &bc);
1513         rta.rta_type = INET_DIAG_REQ_BYTECODE;
1514         rta.rta_len = RTA_LENGTH(bclen);
1515         iov[1] = (struct iovec){ &rta, sizeof(rta) };
1516         iov[2] = (struct iovec){ bc, bclen };
1517         req.nlh.nlmsg_len += RTA_LENGTH(bclen);
1518     }
1519 
1520     msg = (struct msghdr) {
1521         .msg_name = (void*)&nladdr,
1522         .msg_namelen = sizeof(nladdr),
1523         .msg_iov = iov,
1524         .msg_iovlen = f->f ? 3 : 1,
1525     };
1526 
1527     if (sendmsg(fd, &msg, 0) < 0)
1528         return -1;
1529 
1530     iov[0] = (struct iovec){
1531         .iov_base = buf,
1532         .iov_len = sizeof(buf)
1533     };
1534 
1535     while (1) {
1536         int status;
1537         struct nlmsghdr *h;
1538 
1539         msg = (struct msghdr) {
1540             (void*)&nladdr, sizeof(nladdr),
1541             iov,    1,
1542             NULL,    0,
1543             0
1544         };
1545 
1546         status = recvmsg(fd, &msg, 0);
1547 
1548         if (status < 0) {
1549             if (errno == EINTR)
1550                 continue;
1551             perror("OVERRUN");
1552             continue;
1553         }
1554         if (status == 0) {
1555             fprintf(stderr, "EOF on netlink
");
1556             return 0;
1557         }
1558 
1559         if (dump_fp)
1560             fwrite(buf, 1, NLMSG_ALIGN(status), dump_fp);
1561 
1562         h = (struct nlmsghdr*)buf;
1563         while (NLMSG_OK(h, status)) {
1564             int err;
1565             struct inet_diag_msg *r = NLMSG_DATA(h);
1566 
1567             if (/*h->nlmsg_pid != rth->local.nl_pid ||*/
1568                 h->nlmsg_seq != 123456)
1569                 goto skip_it;
1570 
1571             if (h->nlmsg_type == NLMSG_DONE)
1572                 return 0;
1573             if (h->nlmsg_type == NLMSG_ERROR) {
1574                 struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
1575                 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
1576                     fprintf(stderr, "ERROR truncated
");
1577                 } else {
1578                     errno = -err->error;
1579                     perror("TCPDIAG answers");
1580                 }
1581                 return 0;
1582             }
1583             if (!dump_fp) {
1584                 if (!(f->families & (1<<r->idiag_family))) {
1585                     h = NLMSG_NEXT(h, status);
1586                     continue;
1587                 }
1588                 err = tcp_show_sock(h, NULL);
1589                 if (err < 0)
1590                     return err;
1591             }
1592 
1593 skip_it:
1594             h = NLMSG_NEXT(h, status);
1595         }
1596         if (msg.msg_flags & MSG_TRUNC) {
1597             fprintf(stderr, "Message truncated
");
1598             continue;
1599         }
1600         if (status) {
1601             fprintf(stderr, "!!!Remnant of size %d
", status);
1602             exit(1);
1603         }
1604     }
1605     return 0;
1606 }
1607 
1608 static int tcp_show_netlink_file(struct filter *f)
1609 {
1610     FILE    *fp;
1611     char    buf[8192];
1612 
1613     if ((fp = fopen(getenv("TCPDIAG_FILE"), "r")) == NULL) {
1614         perror("fopen($TCPDIAG_FILE)");
1615         return -1;
1616     }
1617 
1618     while (1) {
1619         int status, err;
1620         struct nlmsghdr *h = (struct nlmsghdr*)buf;
1621 
1622         status = fread(buf, 1, sizeof(*h), fp);
1623         if (status < 0) {
1624             perror("Reading header from $TCPDIAG_FILE");
1625             return -1;
1626         }
1627         if (status != sizeof(*h)) {
1628             perror("Unexpected EOF reading $TCPDIAG_FILE");
1629             return -1;
1630         }
1631 
1632         status = fread(h+1, 1, NLMSG_ALIGN(h->nlmsg_len-sizeof(*h)), fp);
1633 
1634         if (status < 0) {
1635             perror("Reading $TCPDIAG_FILE");
1636             return -1;
1637         }
1638         if (status + sizeof(*h) < h->nlmsg_len) {
1639             perror("Unexpected EOF reading $TCPDIAG_FILE");
1640             return -1;
1641         }
1642 
1643         /* The only legal exit point */
1644         if (h->nlmsg_type == NLMSG_DONE)
1645             return 0;
1646 
1647         if (h->nlmsg_type == NLMSG_ERROR) {
1648             struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
1649             if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
1650                 fprintf(stderr, "ERROR truncated
");
1651             } else {
1652                 errno = -err->error;
1653                 perror("TCPDIAG answered");
1654             }
1655             return -1;
1656         }
1657 
1658         err = tcp_show_sock(h, f);
1659         if (err < 0)
1660             return err;
1661     }
1662 }
1663 
1664 static int tcp_show(struct filter *f, int socktype)
1665 {
1666     FILE *fp = NULL;
1667     char *buf = NULL;
1668     int bufsize = 64*1024;
1669 
1670     dg_proto = TCP_PROTO;
1671 
1672     if (getenv("TCPDIAG_FILE"))
1673         return tcp_show_netlink_file(f);
1674 
1675     if (!getenv("PROC_NET_TCP") && !getenv("PROC_ROOT")
1676         && tcp_show_netlink(f, NULL, socktype) == 0)
1677         return 0;
1678 
1679     /* Sigh... We have to parse /proc/net/tcp... */
1680 
1681 
1682     /* Estimate amount of sockets and try to allocate
1683      * huge buffer to read all the table at one read.
1684      * Limit it by 16MB though. The assumption is: as soon as
1685      * kernel was able to hold information about N connections,
1686      * it is able to give us some memory for snapshot.
1687      */
1688     if (1) {
1689         int guess = slabstat.socks+slabstat.tcp_syns;
1690         if (f->states&(1<<SS_TIME_WAIT))
1691             guess += slabstat.tcp_tws;
1692         if (guess > (16*1024*1024)/128)
1693             guess = (16*1024*1024)/128;
1694         guess *= 128;
1695         if (guess > bufsize)
1696             bufsize = guess;
1697     }
1698     while (bufsize >= 64*1024) {
1699         if ((buf = malloc(bufsize)) != NULL)
1700             break;
1701         bufsize /= 2;
1702     }
1703     if (buf == NULL) {
1704         errno = ENOMEM;
1705         return -1;
1706     }
1707 
1708     if (f->families & (1<<AF_INET)) {
1709         if ((fp = net_tcp_open()) == NULL)
1710             goto outerr;
1711 
1712         setbuffer(fp, buf, bufsize);
1713         if (generic_record_read(fp, tcp_show_line, f, AF_INET))
1714             goto outerr;
1715         fclose(fp);
1716     }
1717 
1718     if ((f->families & (1<<AF_INET6)) &&
1719         (fp = net_tcp6_open()) != NULL) {
1720         setbuffer(fp, buf, bufsize);
1721         if (generic_record_read(fp, tcp_show_line, f, AF_INET6))
1722             goto outerr;
1723         fclose(fp);
1724     }
1725 
1726     free(buf);
1727     return 0;
1728 
1729 outerr:
1730     do {
1731         int saved_errno = errno;
1732         if (buf)
1733             free(buf);
1734         if (fp)
1735             fclose(fp);
1736         errno = saved_errno;
1737         return -1;
1738     } while (0);
1739 }
1740 
1741 
1742 int dgram_show_line(char *line, const struct filter *f, int family)
1743 {
1744     struct tcpstat s;
1745     char *loc, *rem, *data;
1746     char opt[256];
1747     int n;
1748     char *p;
1749 
1750     if ((p = strchr(line, ':')) == NULL)
1751         return -1;
1752     loc = p+2;
1753 
1754     if ((p = strchr(loc, ':')) == NULL)
1755         return -1;
1756     p[5] = 0;
1757     rem = p+6;
1758 
1759     if ((p = strchr(rem, ':')) == NULL)
1760         return -1;
1761     p[5] = 0;
1762     data = p+6;
1763 
1764     do {
1765         int state = (data[1] >= 'A') ? (data[1] - 'A' + 10) : (data[1] - '0');
1766 
1767         if (!(f->states & (1<<state)))
1768             return 0;
1769     } while (0);
1770 
1771     s.local.family = s.remote.family = family;
1772     if (family == AF_INET) {
1773         sscanf(loc, "%x:%x", s.local.data, (unsigned*)&s.lport);
1774         sscanf(rem, "%x:%x", s.remote.data, (unsigned*)&s.rport);
1775         s.local.bytelen = s.remote.bytelen = 4;
1776     } else {
1777         sscanf(loc, "%08x%08x%08x%08x:%x",
1778                s.local.data,
1779                s.local.data+1,
1780                s.local.data+2,
1781                s.local.data+3,
1782                &s.lport);
1783         sscanf(rem, "%08x%08x%08x%08x:%x",
1784                s.remote.data,
1785                s.remote.data+1,
1786                s.remote.data+2,
1787                s.remote.data+3,
1788                &s.rport);
1789         s.local.bytelen = s.remote.bytelen = 16;
1790     }
1791 
1792     if (f->f && run_ssfilter(f->f, &s) == 0)
1793         return 0;
1794 
1795     opt[0] = 0;
1796     n = sscanf(data, "%x %x:%x %*x:%*x %*x %d %*d %u %d %llx %[^
]
",
1797            &s.state, &s.wq, &s.rq,
1798            &s.uid, &s.ino,
1799            &s.refcnt, &s.sk, opt);
1800 
1801     if (n < 9)
1802         opt[0] = 0;
1803 
1804     if (netid_width)
1805         printf("%-*s ", netid_width, dg_proto);
1806     if (state_width)
1807         printf("%-*s ", state_width, sstate_name[s.state]);
1808 
1809     printf("%-6d %-6d ", s.rq, s.wq);
1810 
1811     formatted_print(&s.local, s.lport);
1812     formatted_print(&s.remote, s.rport);
1813 
1814     if (show_users) {
1815         char ubuf[4096];
1816         if (find_users(s.ino, ubuf, sizeof(ubuf)) > 0)
1817             printf(" users:(%s)", ubuf);
1818     }
1819 
1820     if (show_details) {
1821         if (s.uid)
1822             printf(" uid=%u", (unsigned)s.uid);
1823         printf(" ino=%u", s.ino);
1824         printf(" sk=%llx", s.sk);
1825         if (opt[0])
1826             printf(" opt:"%s"", opt);
1827     }
1828     printf("
");
1829 
1830     return 0;
1831 }
1832 
1833 
1834 int udp_show(struct filter *f)
1835 {
1836     FILE *fp = NULL;
1837 
1838     dg_proto = UDP_PROTO;
1839 
1840     if (f->families&(1<<AF_INET)) {
1841         if ((fp = net_udp_open()) == NULL)
1842             goto outerr;
1843         if (generic_record_read(fp, dgram_show_line, f, AF_INET))
1844             goto outerr;
1845         fclose(fp);
1846     }
1847 
1848     if ((f->families&(1<<AF_INET6)) &&
1849         (fp = net_udp6_open()) != NULL) {
1850         if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
1851             goto outerr;
1852         fclose(fp);
1853     }
1854     return 0;
1855 
1856 outerr:
1857     do {
1858         int saved_errno = errno;
1859         if (fp)
1860             fclose(fp);
1861         errno = saved_errno;
1862         return -1;
1863     } while (0);
1864 }
1865 
1866 int raw_show(struct filter *f)
1867 {
1868     FILE *fp = NULL;
1869 
1870     dg_proto = RAW_PROTO;
1871 
1872     if (f->families&(1<<AF_INET)) {
1873         if ((fp = net_raw_open()) == NULL)
1874             goto outerr;
1875         if (generic_record_read(fp, dgram_show_line, f, AF_INET))
1876             goto outerr;
1877         fclose(fp);
1878     }
1879 
1880     if ((f->families&(1<<AF_INET6)) &&
1881         (fp = net_raw6_open()) != NULL) {
1882         if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
1883             goto outerr;
1884         fclose(fp);
1885     }
1886     return 0;
1887 
1888 outerr:
1889     do {
1890         int saved_errno = errno;
1891         if (fp)
1892             fclose(fp);
1893         errno = saved_errno;
1894         return -1;
1895     } while (0);
1896 }
1897 
1898 
1899 struct unixstat
1900 {
1901     struct unixstat *next;
1902     int ino;
1903     int peer;
1904     int rq;
1905     int wq;
1906     int state;
1907     int type;
1908     char *name;
1909 };
1910 
1911 
1912 
1913 int unix_state_map[] = { SS_CLOSE, SS_SYN_SENT,
1914              SS_ESTABLISHED, SS_CLOSING };
1915 
1916 
1917 #define MAX_UNIX_REMEMBER (1024*1024/sizeof(struct unixstat))
1918 
1919 void unix_list_free(struct unixstat *list)
1920 {
1921     while (list) {
1922         struct unixstat *s = list;
1923         list = list->next;
1924         if (s->name)
1925             free(s->name);
1926         free(s);
1927     }
1928 }
1929 
1930 void unix_list_print(struct unixstat *list, struct filter *f)
1931 {
1932     struct unixstat *s;
1933     char *peer;
1934 
1935     for (s = list; s; s = s->next) {
1936         if (!(f->states & (1<<s->state)))
1937             continue;
1938         if (s->type == SOCK_STREAM && !(f->dbs&(1<<UNIX_ST_DB)))
1939             continue;
1940         if (s->type == SOCK_DGRAM && !(f->dbs&(1<<UNIX_DG_DB)))
1941             continue;
1942 
1943         peer = "*";
1944         if (s->peer) {
1945             struct unixstat *p;
1946             for (p = list; p; p = p->next) {
1947                 if (s->peer == p->ino)
1948                     break;
1949             }
1950             if (!p) {
1951                 peer = "?";
1952             } else {
1953                 peer = p->name ? : "*";
1954             }
1955         }
1956 
1957         if (f->f) {
1958             struct tcpstat tst;
1959             tst.local.family = AF_UNIX;
1960             tst.remote.family = AF_UNIX;
1961             memcpy(tst.local.data, &s->name, sizeof(s->name));
1962             if (strcmp(peer, "*") == 0)
1963                 memset(tst.remote.data, 0, sizeof(peer));
1964             else
1965                 memcpy(tst.remote.data, &peer, sizeof(peer));
1966             if (run_ssfilter(f->f, &tst) == 0)
1967                 continue;
1968         }
1969 
1970         if (netid_width)
1971             printf("%-*s ", netid_width,
1972                    s->type == SOCK_STREAM ? "u_str" : "u_dgr");
1973         if (state_width)
1974             printf("%-*s ", state_width, sstate_name[s->state]);
1975         printf("%-6d %-6d ", s->rq, s->wq);
1976         printf("%*s %-*d %*s %-*d",
1977                addr_width, s->name ? : "*", serv_width, s->ino,
1978                addr_width, peer, serv_width, s->peer);
1979         if (show_users) {
1980             char ubuf[4096];
1981             if (find_users(s->ino, ubuf, sizeof(ubuf)) > 0)
1982                 printf(" users:(%s)", ubuf);
1983         }
1984         printf("
");
1985     }
1986 }
1987 
1988 int unix_show(struct filter *f)
1989 {
1990     FILE *fp;
1991     char buf[256];
1992     char name[128];
1993     int  newformat = 0;
1994     int  cnt;
1995     struct unixstat *list = NULL;
1996 
1997     if ((fp = net_unix_open()) == NULL)
1998         return -1;
1999     fgets(buf, sizeof(buf)-1, fp);
2000 
2001     if (memcmp(buf, "Peer", 4) == 0)
2002         newformat = 1;
2003     cnt = 0;
2004 
2005     while (fgets(buf, sizeof(buf)-1, fp)) {
2006         struct unixstat *u, **insp;
2007         int flags;
2008 
2009         if (!(u = malloc(sizeof(*u))))
2010             break;
2011         u->name = NULL;
2012 
2013         if (sscanf(buf, "%x: %x %x %x %x %x %d %s",
2014                &u->peer, &u->rq, &u->wq, &flags, &u->type,
2015                &u->state, &u->ino, name) < 8)
2016             name[0] = 0;
2017 
2018         if (flags&(1<<16)) {
2019             u->state = SS_LISTEN;
2020         } else {
2021             u->state = unix_state_map[u->state-1];
2022             if (u->type == SOCK_DGRAM &&
2023                 u->state == SS_CLOSE &&
2024                 u->peer)
2025                 u->state = SS_ESTABLISHED;
2026         }
2027 
2028         if (!newformat) {
2029             u->peer = 0;
2030             u->rq = 0;
2031             u->wq = 0;
2032         }
2033 
2034         insp = &list;
2035         while (*insp) {
2036             if (u->type < (*insp)->type ||
2037                 (u->type == (*insp)->type &&
2038                  u->ino < (*insp)->ino))
2039                 break;
2040             insp = &(*insp)->next;
2041         }
2042         u->next = *insp;
2043         *insp = u;
2044 
2045         if (name[0]) {
2046             if ((u->name = malloc(strlen(name)+1)) == NULL)
2047                 break;
2048             strcpy(u->name, name);
2049         }
2050         if (++cnt > MAX_UNIX_REMEMBER) {
2051             unix_list_print(list, f);
2052             unix_list_free(list);
2053             list = NULL;
2054             cnt = 0;
2055         }
2056     }
2057 
2058     if (list) {
2059         unix_list_print(list, f);
2060         unix_list_free(list);
2061         list = NULL;
2062         cnt = 0;
2063     }
2064 
2065     return 0;
2066 }
2067 
2068 
2069 int packet_show(struct filter *f)
2070 {
2071     FILE *fp;
2072     char buf[256];
2073     int type;
2074     int prot;
2075     int iface;
2076     int state;
2077     int rq;
2078     int uid;
2079     int ino;
2080     unsigned long long sk;
2081 
2082     if (!(f->states & (1<<SS_CLOSE)))
2083         return 0;
2084 
2085     if ((fp = net_packet_open()) == NULL)
2086         return -1;
2087     fgets(buf, sizeof(buf)-1, fp);
2088 
2089     while (fgets(buf, sizeof(buf)-1, fp)) {
2090         sscanf(buf, "%llx %*d %d %x %d %d %u %u %u",
2091                &sk,
2092                &type, &prot, &iface, &state,
2093                &rq, &uid, &ino);
2094 
2095         if (type == SOCK_RAW && !(f->dbs&(1<<PACKET_R_DB)))
2096             continue;
2097         if (type == SOCK_DGRAM && !(f->dbs&(1<<PACKET_DG_DB)))
2098             continue;
2099         if (f->f) {
2100             struct tcpstat tst;
2101             tst.local.family = AF_PACKET;
2102             tst.remote.family = AF_PACKET;
2103             tst.rport = 0;
2104             tst.lport = iface;
2105             tst.local.data[0] = prot;
2106             tst.remote.data[0] = 0;
2107             if (run_ssfilter(f->f, &tst) == 0)
2108                 continue;
2109         }
2110 
2111         if (netid_width)
2112             printf("%-*s ", netid_width,
2113                    type == SOCK_RAW ? "p_raw" : "p_dgr");
2114         if (state_width)
2115             printf("%-*s ", state_width, "UNCONN");
2116         printf("%-6d %-6d ", rq, 0);
2117         if (prot == 3) {
2118             printf("%*s:", addr_width, "*");
2119         } else {
2120             char tb[16];
2121             printf("%*s:", addr_width,
2122                    ll_proto_n2a(htons(prot), tb, sizeof(tb)));
2123         }
2124         if (iface == 0) {
2125             printf("%-*s ", serv_width, "*");
2126         } else {
2127             printf("%-*s ", serv_width, xll_index_to_name(iface));
2128         }
2129         printf("%*s*%-*s",
2130                addr_width, "", serv_width, "");
2131 
2132         if (show_users) {
2133             char ubuf[4096];
2134             if (find_users(ino, ubuf, sizeof(ubuf)) > 0)
2135                 printf(" users:(%s)", ubuf);
2136         }
2137         if (show_details) {
2138             printf(" ino=%u uid=%u sk=%llx", ino, uid, sk);
2139         }
2140         printf("
");
2141     }
2142 
2143     return 0;
2144 }
2145 
2146 int netlink_show(struct filter *f)
2147 {
2148     FILE *fp;
2149     char buf[256];
2150     int prot, pid;
2151     unsigned groups;
2152     int rq, wq, rc;
2153     unsigned long long sk, cb;
2154 
2155     if (!(f->states & (1<<SS_CLOSE)))
2156         return 0;
2157 
2158     if ((fp = net_netlink_open()) == NULL)
2159         return -1;
2160     fgets(buf, sizeof(buf)-1, fp);
2161 
2162     while (fgets(buf, sizeof(buf)-1, fp)) {
2163         sscanf(buf, "%llx %d %d %x %d %d %llx %d",
2164                &sk,
2165                &prot, &pid, &groups, &rq, &wq, &cb, &rc);
2166 
2167         if (f->f) {
2168             struct tcpstat tst;
2169             tst.local.family = AF_NETLINK;
2170             tst.remote.family = AF_NETLINK;
2171             tst.rport = -1;
2172             tst.lport = pid;
2173             tst.local.data[0] = prot;
2174             tst.remote.data[0] = 0;
2175             if (run_ssfilter(f->f, &tst) == 0)
2176                 continue;
2177         }
2178 
2179         if (netid_width)
2180             printf("%-*s ", netid_width, "nl");
2181         if (state_width)
2182             printf("%-*s ", state_width, "UNCONN");
2183         printf("%-6d %-6d ", rq, wq);
2184         if (resolve_services && prot == 0)
2185             printf("%*s:", addr_width, "rtnl");
2186         else if (resolve_services && prot == 3)
2187             printf("%*s:", addr_width, "fw");
2188         else if (resolve_services && prot == 4)
2189             printf("%*s:", addr_width, "tcpdiag");
2190         else
2191             printf("%*d:", addr_width, prot);
2192         if (pid == -1) {
2193             printf("%-*s ", serv_width, "*");
2194         } else if (resolve_services) {
2195             int done = 0;
2196             if (!pid) {
2197                 done = 1;
2198                 printf("%-*s ", serv_width, "kernel");
2199             } else if (pid > 0) {
2200                 char procname[64];
2201                 FILE *fp;
2202                 sprintf(procname, "%s/%d/stat",
2203                     getenv("PROC_ROOT") ? : "/proc", pid);
2204                 if ((fp = fopen(procname, "r")) != NULL) {
2205                     if (fscanf(fp, "%*d (%[^)])", procname) == 1) {
2206                         sprintf(procname+strlen(procname), "/%d", pid);
2207                         printf("%-*s ", serv_width, procname);
2208                         done = 1;
2209                     }
2210                     fclose(fp);
2211                 }
2212             }
2213             if (!done)
2214                 printf("%-*d ", serv_width, pid);
2215         } else {
2216             printf("%-*d ", serv_width, pid);
2217         }
2218         printf("%*s*%-*s",
2219                addr_width, "", serv_width, "");
2220 
2221         if (show_details) {
2222             printf(" sk=%llx cb=%llx groups=0x%08x", sk, cb, groups);
2223         }
2224         printf("
");
2225     }
2226 
2227     return 0;
2228 }
2229 
2230 struct snmpstat
2231 {
2232     int tcp_estab;
2233 };
2234 
2235 int get_snmp_int(char *proto, char *key, int *result)
2236 {
2237     char buf[1024];
2238     FILE *fp;
2239     int protolen = strlen(proto);
2240     int keylen = strlen(key);
2241 
2242     *result = 0;
2243 
2244     if ((fp = net_snmp_open()) == NULL)
2245         return -1;
2246 
2247     while (fgets(buf, sizeof(buf), fp) != NULL) {
2248         char *p = buf;
2249         int  pos = 0;
2250         if (memcmp(buf, proto, protolen))
2251             continue;
2252         while ((p = strchr(p, ' ')) != NULL) {
2253             pos++;
2254             p++;
2255             if (memcmp(p, key, keylen) == 0 &&
2256                 (p[keylen] == ' ' || p[keylen] == '
'))
2257                 break;
2258         }
2259         if (fgets(buf, sizeof(buf), fp) == NULL)
2260             break;
2261         if (memcmp(buf, proto, protolen))
2262             break;
2263         p = buf;
2264         while ((p = strchr(p, ' ')) != NULL) {
2265             p++;
2266             if (--pos == 0) {
2267                 sscanf(p, "%d", result);
2268                 fclose(fp);
2269                 return 0;
2270             }
2271         }
2272     }
2273 
2274     fclose(fp);
2275     errno = ESRCH;
2276     return -1;
2277 }
2278 
2279 
2280 /* Get stats from sockstat */
2281 
2282 struct sockstat
2283 {
2284     int socks;
2285     int tcp_mem;
2286     int tcp_total;
2287     int tcp_orphans;
2288     int tcp_tws;
2289     int tcp4_hashed;
2290     int udp4;
2291     int raw4;
2292     int frag4;
2293     int frag4_mem;
2294     int tcp6_hashed;
2295     int udp6;
2296     int raw6;
2297     int frag6;
2298     int frag6_mem;
2299 };
2300 
2301 static void get_sockstat_line(char *line, struct sockstat *s)
2302 {
2303     char id[256], rem[256];
2304 
2305     if (sscanf(line, "%[^ ] %[^
]
", id, rem) != 2)
2306         return;
2307 
2308     if (strcmp(id, "sockets:") == 0)
2309         sscanf(rem, "%*s%d", &s->socks);
2310     else if (strcmp(id, "UDP:") == 0)
2311         sscanf(rem, "%*s%d", &s->udp4);
2312     else if (strcmp(id, "UDP6:") == 0)
2313         sscanf(rem, "%*s%d", &s->udp6);
2314     else if (strcmp(id, "RAW:") == 0)
2315         sscanf(rem, "%*s%d", &s->raw4);
2316     else if (strcmp(id, "RAW6:") == 0)
2317         sscanf(rem, "%*s%d", &s->raw6);
2318     else if (strcmp(id, "TCP6:") == 0)
2319         sscanf(rem, "%*s%d", &s->tcp6_hashed);
2320     else if (strcmp(id, "FRAG:") == 0)
2321         sscanf(rem, "%*s%d%*s%d", &s->frag4, &s->frag4_mem);
2322     else if (strcmp(id, "FRAG6:") == 0)
2323         sscanf(rem, "%*s%d%*s%d", &s->frag6, &s->frag6_mem);
2324     else if (strcmp(id, "TCP:") == 0)
2325         sscanf(rem, "%*s%d%*s%d%*s%d%*s%d%*s%d",
2326                &s->tcp4_hashed,
2327                &s->tcp_orphans, &s->tcp_tws, &s->tcp_total, &s->tcp_mem);
2328 }
2329 
2330 int get_sockstat(struct sockstat *s)
2331 {
2332     char buf[256];
2333     FILE *fp;
2334 
2335     memset(s, 0, sizeof(*s));
2336 
2337     if ((fp = net_sockstat_open()) == NULL)
2338         return -1;
2339     while(fgets(buf, sizeof(buf), fp) != NULL)
2340         get_sockstat_line(buf, s);
2341     fclose(fp);
2342 
2343     if ((fp = net_sockstat6_open()) == NULL)
2344         return 0;
2345     while(fgets(buf, sizeof(buf), fp) != NULL)
2346         get_sockstat_line(buf, s);
2347     fclose(fp);
2348 
2349     return 0;
2350 }
2351 
2352 int print_summary(void)
2353 {
2354     struct sockstat s;
2355     struct snmpstat sn;
2356 
2357     if (get_sockstat(&s) < 0)
2358         perror("ss: get_sockstat");
2359     if (get_snmp_int("Tcp:", "CurrEstab", &sn.tcp_estab) < 0)
2360         perror("ss: get_snmpstat");
2361 
2362     printf("Total: %d (kernel %d)
", s.socks, slabstat.socks);
2363 
2364     printf("TCP:   %d (estab %d, closed %d, orphaned %d, synrecv %d, timewait %d/%d), ports %d
",
2365            s.tcp_total + slabstat.tcp_syns + s.tcp_tws,
2366            sn.tcp_estab,
2367            s.tcp_total - (s.tcp4_hashed+s.tcp6_hashed-s.tcp_tws),
2368            s.tcp_orphans,
2369            slabstat.tcp_syns,
2370            s.tcp_tws, slabstat.tcp_tws,
2371            slabstat.tcp_ports
2372            );
2373 
2374     printf("
");
2375     printf("Transport Total     IP        IPv6
");
2376     printf("*      %-9d %-9s %-9s
", slabstat.socks, "-", "-");
2377     printf("RAW      %-9d %-9d %-9d
", s.raw4+s.raw6, s.raw4, s.raw6);
2378     printf("UDP      %-9d %-9d %-9d
", s.udp4+s.udp6, s.udp4, s.udp6);
2379     printf("TCP      %-9d %-9d %-9d
", s.tcp4_hashed+s.tcp6_hashed, s.tcp4_hashed, s.tcp6_hashed);
2380     printf("INET      %-9d %-9d %-9d
",
2381            s.raw4+s.udp4+s.tcp4_hashed+
2382            s.raw6+s.udp6+s.tcp6_hashed,
2383            s.raw4+s.udp4+s.tcp4_hashed,
2384            s.raw6+s.udp6+s.tcp6_hashed);
2385     printf("FRAG      %-9d %-9d %-9d
", s.frag4+s.frag6, s.frag4, s.frag6);
2386 
2387     printf("
");
2388 
2389     return 0;
2390 }
2391 
2392 static void _usage(FILE *dest)
2393 {
2394     fprintf(dest,
2395 "Usage: ss [ OPTIONS ]
"
2396 "       ss [ OPTIONS ] [ FILTER ]
"
2397 "   -h, --help        this message
"
2398 "   -V, --version    output version information
"
2399 "   -n, --numeric    don't resolve service names
"
2400 "   -r, --resolve       resolve host names
"
2401 "   -a, --all        display all sockets
"
2402 "   -l, --listening    display listening sockets
"
2403 "   -o, --options       show timer information
"
2404 "   -e, --extended      show detailed socket information
"
2405 "   -m, --memory        show socket memory usage
"
2406 "   -p, --processes    show process using socket
"
2407 "   -i, --info        show internal TCP information
"
2408 "   -s, --summary    show socket usage summary
"
2409 "
"
2410 "   -4, --ipv4          display only IP version 4 sockets
"
2411 "   -6, --ipv6          display only IP version 6 sockets
"
2412 "   -0, --packet    display PACKET sockets
"
2413 "   -t, --tcp        display only TCP sockets
"
2414 "   -u, --udp        display only UDP sockets
"
2415 "   -d, --dccp        display only DCCP sockets
"
2416 "   -w, --raw        display only RAW sockets
"
2417 "   -x, --unix        display only Unix domain sockets
"
2418 "   -f, --family=FAMILY display sockets of type FAMILY
"
2419 "
"
2420 "   -A, --query=QUERY, --socket=QUERY
"
2421 "       QUERY := {all|inet|tcp|udp|raw|unix|packet|netlink}[,QUERY]
"
2422 "
"
2423 "   -D, --diag=FILE     Dump raw information about TCP sockets to FILE
"
2424 "   -F, --filter=FILE   read filter information from FILE
"
2425 "       FILTER := [ state TCP-STATE ] [ EXPRESSION ]
"
2426         );
2427 }
2428 
2429 static void help(void) __attribute__((noreturn));
2430 static void help(void)
2431 {
2432     _usage(stdout);
2433     exit(0);
2434 }
2435 
2436 static void usage(void) __attribute__((noreturn));
2437 static void usage(void)
2438 {
2439     _usage(stderr);
2440     exit(-1);
2441 }
2442 
2443 
2444 int scan_state(const char *state)
2445 {
2446     int i;
2447     if (strcasecmp(state, "close") == 0 ||
2448         strcasecmp(state, "closed") == 0)
2449         return (1<<SS_CLOSE);
2450     if (strcasecmp(state, "syn-rcv") == 0)
2451         return (1<<SS_SYN_RECV);
2452     if (strcasecmp(state, "established") == 0)
2453         return (1<<SS_ESTABLISHED);
2454     if (strcasecmp(state, "all") == 0)
2455         return SS_ALL;
2456     if (strcasecmp(state, "connected") == 0)
2457         return SS_ALL & ~((1<<SS_CLOSE)|(1<<SS_LISTEN));
2458     if (strcasecmp(state, "synchronized") == 0)
2459         return SS_ALL & ~((1<<SS_CLOSE)|(1<<SS_LISTEN)|(1<<SS_SYN_SENT));
2460     if (strcasecmp(state, "bucket") == 0)
2461         return (1<<SS_SYN_RECV)|(1<<SS_TIME_WAIT);
2462     if (strcasecmp(state, "big") == 0)
2463         return SS_ALL & ~((1<<SS_SYN_RECV)|(1<<SS_TIME_WAIT));
2464     for (i=0; i<SS_MAX; i++) {
2465         if (strcasecmp(state, sstate_namel[i]) == 0)
2466             return (1<<i);
2467     }
2468     return 0;
2469 }
2470 
2471 static const struct option long_opts[] = {
2472     { "numeric", 0, 0, 'n' },
2473     { "resolve", 0, 0, 'r' },
2474     { "options", 0, 0, 'o' },
2475     { "extended", 0, 0, 'e' },
2476     { "memory", 0, 0, 'm' },
2477     { "info", 0, 0, 'i' },
2478     { "processes", 0, 0, 'p' },
2479     { "dccp", 0, 0, 'd' },
2480     { "tcp", 0, 0, 't' },
2481     { "udp", 0, 0, 'u' },
2482     { "raw", 0, 0, 'w' },
2483     { "unix", 0, 0, 'x' },
2484     { "all", 0, 0, 'a' },
2485     { "listening", 0, 0, 'l' },
2486     { "ipv4", 0, 0, '4' },
2487     { "ipv6", 0, 0, '6' },
2488     { "packet", 0, 0, '0' },
2489     { "family", 1, 0, 'f' },
2490     { "socket", 1, 0, 'A' },
2491     { "query", 1, 0, 'A' },
2492     { "summary", 0, 0, 's' },
2493     { "diag", 1, 0, 'D' },
2494     { "filter", 1, 0, 'F' },
2495     { "version", 0, 0, 'V' },
2496     { "help", 0, 0, 'h' },
2497     { 0 }
2498 
2499 };
2500 
2501 int main(int argc, char *argv[])
2502 {
2503     int do_default = 1;
2504     int saw_states = 0;
2505     int saw_query = 0;
2506     int do_summary = 0;
2507     const char *dump_tcpdiag = NULL;
2508     FILE *filter_fp = NULL;
2509     int ch;
2510 
2511     memset(&current_filter, 0, sizeof(current_filter));
2512 
2513     current_filter.states = default_filter.states;
2514 
2515     while ((ch = getopt_long(argc, argv, "dhaletuwxnro460spf:miA:D:F:vV",
2516                  long_opts, NULL)) != EOF) {
2517         switch(ch) {
2518         case 'n':
2519             resolve_services = 0;
2520             break;
2521         case 'r':
2522             resolve_hosts = 1;
2523             break;
2524         case 'o':
2525             show_options = 1;
2526             break;
2527         case 'e':
2528             show_options = 1;
2529             show_details++;
2530             break;
2531         case 'm':
2532             show_mem = 1;
2533             break;
2534         case 'i':
2535             show_tcpinfo = 1;
2536             break;
2537         case 'p':
2538             show_users++;
2539             user_ent_hash_build();
2540             break;
2541         case 'd':
2542             current_filter.dbs |= (1<<DCCP_DB);
2543             do_default = 0;
2544             break;
2545         case 't':
2546             current_filter.dbs |= (1<<TCP_DB);
2547             do_default = 0;
2548             break;
2549         case 'u':
2550             current_filter.dbs |= (1<<UDP_DB);
2551             do_default = 0;
2552             break;
2553         case 'w':
2554             current_filter.dbs |= (1<<RAW_DB);
2555             do_default = 0;
2556             break;
2557         case 'x':
2558             current_filter.dbs |= UNIX_DBM;
2559             do_default = 0;
2560             break;
2561         case 'a':
2562             current_filter.states = SS_ALL;
2563             break;
2564         case 'l':
2565             current_filter.states = (1<<SS_LISTEN);
2566             break;
2567         case '4':
2568             preferred_family = AF_INET;
2569             break;
2570         case '6':
2571             preferred_family = AF_INET6;
2572             break;
2573         case '0':
2574             preferred_family = AF_PACKET;
2575             break;
2576         case 'f':
2577             if (strcmp(optarg, "inet") == 0)
2578                 preferred_family = AF_INET;
2579             else if (strcmp(optarg, "inet6") == 0)
2580                 preferred_family = AF_INET6;
2581             else if (strcmp(optarg, "link") == 0)
2582                 preferred_family = AF_PACKET;
2583             else if (strcmp(optarg, "unix") == 0)
2584                 preferred_family = AF_UNIX;
2585             else if (strcmp(optarg, "netlink") == 0)
2586                 preferred_family = AF_NETLINK;
2587             else if (strcmp(optarg, "help") == 0)
2588                 help();
2589             else {
2590                 fprintf(stderr, "ss: "%s" is invalid family
", optarg);
2591                 usage();
2592             }
2593             break;
2594         case 'A':
2595         {
2596             char *p, *p1;
2597             if (!saw_query) {
2598                 current_filter.dbs = 0;
2599                 saw_query = 1;
2600                 do_default = 0;
2601             }
2602             p = p1 = optarg;
2603             do {
2604                 if ((p1 = strchr(p, ',')) != NULL)
2605                     *p1 = 0;
2606                 if (strcmp(p, "all") == 0) {
2607                     current_filter.dbs = ALL_DB;
2608                 } else if (strcmp(p, "inet") == 0) {
2609                     current_filter.dbs |= (1<<TCP_DB)|(1<<DCCP_DB)|(1<<UDP_DB)|(1<<RAW_DB);
2610                 } else if (strcmp(p, "udp") == 0) {
2611                     current_filter.dbs |= (1<<UDP_DB);
2612                 } else if (strcmp(p, "dccp") == 0) {
2613                     current_filter.dbs |= (1<<DCCP_DB);
2614                 } else if (strcmp(p, "tcp") == 0) {
2615                     current_filter.dbs |= (1<<TCP_DB);
2616                 } else if (strcmp(p, "raw") == 0) {
2617                     current_filter.dbs |= (1<<RAW_DB);
2618                 } else if (strcmp(p, "unix") == 0) {
2619                     current_filter.dbs |= UNIX_DBM;
2620                 } else if (strcasecmp(p, "unix_stream") == 0 ||
2621                        strcmp(p, "u_str") == 0) {
2622                     current_filter.dbs |= (1<<UNIX_ST_DB);
2623                 } else if (strcasecmp(p, "unix_dgram") == 0 ||
2624                        strcmp(p, "u_dgr") == 0) {
2625                     current_filter.dbs |= (1<<UNIX_DG_DB);
2626                 } else if (strcmp(p, "packet") == 0) {
2627                     current_filter.dbs |= PACKET_DBM;
2628                 } else if (strcmp(p, "packet_raw") == 0 ||
2629                        strcmp(p, "p_raw") == 0) {
2630                     current_filter.dbs |= (1<<PACKET_R_DB);
2631                 } else if (strcmp(p, "packet_dgram") == 0 ||
2632                        strcmp(p, "p_dgr") == 0) {
2633                     current_filter.dbs |= (1<<PACKET_DG_DB);
2634                 } else if (strcmp(p, "netlink") == 0) {
2635                     current_filter.dbs |= (1<<NETLINK_DB);
2636                 } else {
2637                     fprintf(stderr, "ss: "%s" is illegal socket table id
", p);
2638                     usage();
2639                 }
2640                 p = p1 + 1;
2641             } while (p1);
2642             break;
2643         }
2644         case 's':
2645             do_summary = 1;
2646             break;
2647         case 'D':
2648             dump_tcpdiag = optarg;
2649             break;
2650         case 'F':
2651             if (filter_fp) {
2652                 fprintf(stderr, "More than one filter file
");
2653                 exit(-1);
2654             }
2655             if (optarg[0] == '-')
2656                 filter_fp = stdin;
2657             else
2658                 filter_fp = fopen(optarg, "r");
2659             if (!filter_fp) {
2660                 perror("fopen filter file");
2661                 exit(-1);
2662             }
2663             break;
2664         case 'v':
2665         case 'V':
2666             printf("ss utility, iproute2-ss%s
", SNAPSHOT);
2667             exit(0);
2668         case 'h':
2669         case '?':
2670             help();
2671         default:
2672             usage();
2673         }
2674     }
2675 
2676     argc -= optind;
2677     argv += optind;
2678 
2679     get_slabstat(&slabstat);
2680 
2681     if (do_summary) {
2682         print_summary();
2683         if (do_default && argc == 0)
2684             exit(0);
2685     }
2686 
2687     if (do_default)
2688         current_filter.dbs = default_filter.dbs;
2689 
2690     if (preferred_family == AF_UNSPEC) {
2691         if (!(current_filter.dbs&~UNIX_DBM))
2692             preferred_family = AF_UNIX;
2693         else if (!(current_filter.dbs&~PACKET_DBM))
2694             preferred_family = AF_PACKET;
2695         else if (!(current_filter.dbs&~(1<<NETLINK_DB)))
2696             preferred_family = AF_NETLINK;
2697     }
2698 
2699     if (preferred_family != AF_UNSPEC) {
2700         int mask2;
2701         if (preferred_family == AF_INET ||
2702             preferred_family == AF_INET6) {
2703             mask2= current_filter.dbs;
2704         } else if (preferred_family == AF_PACKET) {
2705             mask2 = PACKET_DBM;
2706         } else if (preferred_family == AF_UNIX) {
2707             mask2 = UNIX_DBM;
2708         } else if (preferred_family == AF_NETLINK) {
2709             mask2 = (1<<NETLINK_DB);
2710         } else {
2711             mask2 = 0;
2712         }
2713 
2714         if (do_default)
2715             current_filter.dbs = mask2;
2716         else
2717             current_filter.dbs &= mask2;
2718         current_filter.families = (1<<preferred_family);
2719     } else {
2720         if (!do_default)
2721             current_filter.families = ~0;
2722         else
2723             current_filter.families = default_filter.families;
2724     }
2725     if (current_filter.dbs == 0) {
2726         fprintf(stderr, "ss: no socket tables to show with such filter.
");
2727         exit(0);
2728     }
2729     if (current_filter.families == 0) {
2730         fprintf(stderr, "ss: no families to show with such filter.
");
2731         exit(0);
2732     }
2733 
2734     if (resolve_services && resolve_hosts &&
2735         (current_filter.dbs&(UNIX_DBM|(1<<TCP_DB)|(1<<UDP_DB)|(1<<DCCP_DB))))
2736         init_service_resolver();
2737 
2738     /* Now parse filter... */
2739     if (argc == 0 && filter_fp) {
2740         if (ssfilter_parse(&current_filter.f, 0, NULL, filter_fp))
2741             usage();
2742     }
2743 
2744     while (argc > 0) {
2745         if (strcmp(*argv, "state") == 0) {
2746             NEXT_ARG();
2747             if (!saw_states)
2748                 current_filter.states = 0;
2749             current_filter.states |= scan_state(*argv);
2750             saw_states = 1;
2751         } else if (strcmp(*argv, "exclude") == 0 ||
2752                strcmp(*argv, "excl") == 0) {
2753             NEXT_ARG();
2754             if (!saw_states)
2755                 current_filter.states = SS_ALL;
2756             current_filter.states &= ~scan_state(*argv);
2757             saw_states = 1;
2758         } else {
2759             if (ssfilter_parse(&current_filter.f, argc, argv, filter_fp))
2760                 usage();
2761             break;
2762         }
2763         argc--; argv++;
2764     }
2765 
2766     if (current_filter.states == 0) {
2767         fprintf(stderr, "ss: no socket states to show with such filter.
");
2768         exit(0);
2769     }
2770 
2771     if (dump_tcpdiag) {
2772         FILE *dump_fp = stdout;
2773         if (!(current_filter.dbs & (1<<TCP_DB))) {
2774             fprintf(stderr, "ss: tcpdiag dump requested and no tcp in filter.
");
2775             exit(0);
2776         }
2777         if (dump_tcpdiag[0] != '-') {
2778             dump_fp = fopen(dump_tcpdiag, "w");
2779             if (!dump_tcpdiag) {
2780                 perror("fopen dump file");
2781                 exit(-1);
2782             }
2783         }
2784         tcp_show_netlink(&current_filter, dump_fp, TCPDIAG_GETSOCK);
2785         fflush(dump_fp);
2786         exit(0);
2787     }
2788 
2789     netid_width = 0;
2790     if (current_filter.dbs&(current_filter.dbs-1))
2791         netid_width = 5;
2792 
2793     state_width = 0;
2794     if (current_filter.states&(current_filter.states-1))
2795         state_width = 10;
2796 
2797     screen_width = 80;
2798     if (isatty(STDOUT_FILENO)) {
2799         struct winsize w;
2800 
2801         if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1) {
2802             if (w.ws_col > 0)
2803                 screen_width = w.ws_col;
2804         }
2805     }
2806 
2807     addrp_width = screen_width;
2808     addrp_width -= netid_width+1;
2809     addrp_width -= state_width+1;
2810     addrp_width -= 14;
2811 
2812     if (addrp_width&1) {
2813         if (netid_width)
2814             netid_width++;
2815         else if (state_width)
2816             state_width++;
2817     }
2818 
2819     addrp_width /= 2;
2820     addrp_width--;
2821 
2822     serv_width = resolve_services ? 7 : 5;
2823 
2824     if (addrp_width < 15+serv_width+1)
2825         addrp_width = 15+serv_width+1;
2826 
2827     addr_width = addrp_width - serv_width - 1;
2828 
2829     if (netid_width)
2830         printf("%-*s ", netid_width, "Netid");
2831     if (state_width)
2832         printf("%-*s ", state_width, "State");
2833     printf("%-6s %-6s ", "Recv-Q", "Send-Q");
2834 
2835     printf("%*s:%-*s %*s:%-*s
",
2836            addr_width, "Local Address", serv_width, "Port",
2837            addr_width, "Peer Address", serv_width, "Port");
2838 
2839     fflush(stdout);
2840 
2841     if (current_filter.dbs & (1<<NETLINK_DB))
2842         netlink_show(&current_filter);
2843     if (current_filter.dbs & PACKET_DBM)
2844         packet_show(&current_filter);
2845     if (current_filter.dbs & UNIX_DBM)
2846         unix_show(&current_filter);
2847     if (current_filter.dbs & (1<<RAW_DB))
2848         raw_show(&current_filter);
2849     if (current_filter.dbs & (1<<UDP_DB))
2850         udp_show(&current_filter);
2851     if (current_filter.dbs & (1<<TCP_DB))
2852         tcp_show(&current_filter, TCPDIAG_GETSOCK);
2853     if (current_filter.dbs & (1<<DCCP_DB))
2854         tcp_show(&current_filter, DCCPDIAG_GETSOCK);
2855     return 0;
2856 }
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原文地址：https://www.cnblogs.com/forcheryl/p/4078986.html