1 /*- 2 * Copyright (c) 1980, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)netstat.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $ 35 * $DragonFly: src/usr.bin/systat/netstat.c,v 1.9 2007/05/31 11:38:36 hasso Exp $ 36 */ 37 38 /* 39 * netstat 40 */ 41 #include <sys/param.h> 42 #include <sys/queue.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/protosw.h> 46 #include <sys/sysctl.h> 47 48 #include <netinet/in.h> 49 #include <arpa/inet.h> 50 #include <net/route.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #ifdef INET6 54 #include <netinet/ip6.h> 55 #endif 56 #include <netinet/in_pcb.h> 57 #include <netinet/ip_icmp.h> 58 #include <netinet/icmp_var.h> 59 #include <netinet/ip_var.h> 60 #include <netinet/tcp.h> 61 #include <netinet/tcpip.h> 62 #include <netinet/tcp_seq.h> 63 #define TCPSTATES 64 #include <netinet/tcp_fsm.h> 65 #include <netinet/tcp_timer.h> 66 #include <netinet/tcp_var.h> 67 #include <netinet/tcp_debug.h> 68 #include <netinet/udp.h> 69 #include <netinet/udp_var.h> 70 71 #include <err.h> 72 #include <errno.h> 73 #include <netdb.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <nlist.h> 77 #include <paths.h> 78 #include "systat.h" 79 #include "extern.h" 80 81 static void enter(struct inpcb *, struct xsocket *, int, const char *); 82 static char *inetname(struct in_addr); 83 static void inetprint(struct in_addr *, int, const char *); 84 85 #define streq(a,b) (strcmp(a,b)==0) 86 #define YMAX(w) ((w)->_maxy-1) 87 88 WINDOW * 89 opennetstat(void) 90 { 91 sethostent(1); 92 setnetent(1); 93 return (subwin(stdscr, LINES-5-1, 0, 5, 0)); 94 } 95 96 struct netinfo { 97 struct netinfo *ni_forw, *ni_prev; 98 short ni_line; /* line on screen */ 99 short ni_seen; /* 0 when not present in list */ 100 short ni_flags; 101 #define NIF_LACHG 0x1 /* local address changed */ 102 #define NIF_FACHG 0x2 /* foreign address changed */ 103 short ni_state; /* tcp state */ 104 const char *ni_proto; /* protocol */ 105 struct in_addr ni_laddr; /* local address */ 106 long ni_lport; /* local port */ 107 struct in_addr ni_faddr; /* foreign address */ 108 long ni_fport; /* foreign port */ 109 long ni_rcvcc; /* rcv buffer character count */ 110 long ni_sndcc; /* snd buffer character count */ 111 }; 112 113 static struct { 114 struct netinfo *ni_forw, *ni_prev; 115 } netcb; 116 117 static int aflag = 0; 118 static int nflag = 0; 119 static int lastrow = 1; 120 121 void 122 closenetstat(WINDOW *w) 123 { 124 register struct netinfo *p; 125 126 endhostent(); 127 endnetent(); 128 p = (struct netinfo *)netcb.ni_forw; 129 while (p != (struct netinfo *)&netcb) { 130 if (p->ni_line != -1) 131 lastrow--; 132 p->ni_line = -1; 133 p = p->ni_forw; 134 } 135 if (w != NULL) { 136 wclear(w); 137 wrefresh(w); 138 delwin(w); 139 } 140 } 141 142 int 143 initnetstat(void) 144 { 145 netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb; 146 protos = TCP|UDP; 147 return(1); 148 } 149 150 static void 151 enter_tcp(void *xig) 152 { 153 struct xtcpcb *xtcp = (struct xtcpcb *)xig; 154 struct xsocket *xso; 155 int state; 156 157 if (xtcp->xt_len < sizeof(*xtcp)) 158 return; 159 xso = &xtcp->xt_socket; 160 state = xtcp->xt_tp.t_state; 161 enter(&xtcp->xt_inp, xso, state, "tcp"); 162 } 163 164 static void 165 enter_udp(void *xig) 166 { 167 struct xinpcb *xinp = (struct xinpcb *)xig; 168 struct xsocket *xso; 169 170 if (xinp->xi_len < sizeof(*xinp)) 171 return; 172 xso = &xinp->xi_socket; 173 enter(&xinp->xi_inp, xso, 0, "udp"); 174 } 175 176 static void 177 fetchnetstat_proto(void (*enter_proto)(void *), 178 const char *mibvar) 179 { 180 char *buf, *buf2; 181 size_t i, len, elem_len; 182 183 if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) { 184 if (errno != ENOENT) 185 warn("sysctl: %s", mibvar); 186 return; 187 } 188 if ((buf = malloc(len)) == NULL) { 189 warn("malloc %lu bytes", (u_long)len); 190 return; 191 } 192 if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) { 193 warn("sysctl: %s", mibvar); 194 free(buf); 195 return; 196 } 197 198 /* 199 * XXX this is better with a single PCB type 200 */ 201 if (len == 0) { 202 free(buf); 203 return; 204 } 205 if (len < sizeof(size_t)) { 206 warnx("sysctl: short read"); 207 free(buf); 208 return; 209 } 210 elem_len = *(size_t *)buf; 211 len /= elem_len; 212 buf2 = buf; 213 for (i = 0; i < len; i++, buf2 += elem_len) { 214 if (*(size_t *)(buf2) != elem_len) { 215 warn("sysctl: inconsistent PCB len"); 216 free(buf); 217 return; 218 } 219 enter_proto(buf2); 220 } 221 free(buf); 222 } 223 224 void 225 fetchnetstat(void) 226 { 227 register struct netinfo *p; 228 229 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) 230 p->ni_seen = 0; 231 if (protos & TCP) 232 fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist"); 233 if (protos & UDP) 234 fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist"); 235 } 236 237 static void 238 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto) 239 { 240 register struct netinfo *p; 241 242 if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY) 243 return; 244 if (nhosts && !checkhost(inp)) 245 return; 246 if (nports && !checkport(inp)) 247 return; 248 /* 249 * pcblist may return non-ipv4 sockets, but at the moment 250 * -netstat code doesn't support other than ipv4. 251 */ 252 if ((inp->inp_vflag & INP_IPV4) == 0) 253 return; 254 /* 255 * Only take exact matches, any sockets with 256 * previously unbound addresses will be deleted 257 * below in the display routine because they 258 * will appear as ``not seen'' in the kernel 259 * data structures. 260 */ 261 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 262 if (!streq(proto, p->ni_proto)) 263 continue; 264 if (p->ni_lport != inp->inp_lport || 265 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 266 continue; 267 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 268 p->ni_fport == inp->inp_fport) 269 break; 270 } 271 if (p == (struct netinfo *)&netcb) { 272 if ((p = malloc(sizeof(*p))) == NULL) { 273 error("Out of memory"); 274 return; 275 } 276 p->ni_prev = (struct netinfo *)&netcb; 277 p->ni_forw = netcb.ni_forw; 278 netcb.ni_forw->ni_prev = p; 279 netcb.ni_forw = p; 280 p->ni_line = -1; 281 p->ni_laddr = inp->inp_laddr; 282 p->ni_lport = inp->inp_lport; 283 p->ni_faddr = inp->inp_faddr; 284 p->ni_fport = inp->inp_fport; 285 p->ni_proto = proto; 286 p->ni_flags = NIF_LACHG|NIF_FACHG; 287 } 288 p->ni_rcvcc = so->so_rcv.sb_cc; 289 p->ni_sndcc = so->so_snd.sb_cc; 290 p->ni_state = state; 291 p->ni_seen = 1; 292 } 293 294 /* column locations */ 295 #define LADDR 0 296 #define FADDR LADDR+22 297 #define CPUID FADDR+22 298 #define PROTO CPUID+4 299 #define RCVCC PROTO+6 300 #define SNDCC RCVCC+7 301 #define STATE SNDCC+7 302 303 304 void 305 labelnetstat(void) 306 { 307 wmove(wnd, 0, 0); wclrtobot(wnd); 308 mvwaddstr(wnd, 0, LADDR, "Local Address"); 309 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 310 mvwaddstr(wnd, 0, PROTO, "Proto"); 311 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 312 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 313 mvwaddstr(wnd, 0, STATE, "(state)"); 314 } 315 316 void 317 shownetstat(void) 318 { 319 register struct netinfo *p, *q; 320 321 /* 322 * First, delete any connections that have gone 323 * away and adjust the position of connections 324 * below to reflect the deleted line. 325 */ 326 p = netcb.ni_forw; 327 while (p != (struct netinfo *)&netcb) { 328 if (p->ni_line == -1 || p->ni_seen) { 329 p = p->ni_forw; 330 continue; 331 } 332 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 333 q = netcb.ni_forw; 334 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 335 if (q != p && q->ni_line > p->ni_line) { 336 q->ni_line--; 337 /* this shouldn't be necessary */ 338 q->ni_flags |= NIF_LACHG|NIF_FACHG; 339 } 340 lastrow--; 341 q = p->ni_forw; 342 p->ni_prev->ni_forw = p->ni_forw; 343 p->ni_forw->ni_prev = p->ni_prev; 344 free(p); 345 p = q; 346 } 347 /* 348 * Update existing connections and add new ones. 349 */ 350 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 351 if (p->ni_line == -1) { 352 /* 353 * Add a new entry if possible. 354 */ 355 if (lastrow > YMAX(wnd)) 356 continue; 357 p->ni_line = lastrow++; 358 p->ni_flags |= NIF_LACHG|NIF_FACHG; 359 } 360 if (p->ni_flags & NIF_LACHG) { 361 wmove(wnd, p->ni_line, LADDR); 362 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 363 p->ni_flags &= ~NIF_LACHG; 364 } 365 if (p->ni_flags & NIF_FACHG) { 366 wmove(wnd, p->ni_line, FADDR); 367 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 368 p->ni_flags &= ~NIF_FACHG; 369 } 370 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 371 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 372 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 373 if (streq(p->ni_proto, "tcp")) 374 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 375 mvwprintw(wnd, p->ni_line, STATE, "%d", 376 p->ni_state); 377 else 378 mvwaddstr(wnd, p->ni_line, STATE, 379 tcpstates[p->ni_state]); 380 wclrtoeol(wnd); 381 } 382 if (lastrow < YMAX(wnd)) { 383 wmove(wnd, lastrow, 0); wclrtobot(wnd); 384 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */ 385 } 386 } 387 388 /* 389 * Pretty print an Internet address (net address + port). 390 * If the nflag was specified, use numbers instead of names. 391 */ 392 static void 393 inetprint(register struct in_addr *in, int port, const char *proto) 394 { 395 struct servent *sp = 0; 396 char line[80], *cp; 397 398 snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in)); 399 cp = strchr(line, '\0'); 400 if (!nflag && port) 401 sp = getservbyport(port, proto); 402 if (sp || port == 0) 403 snprintf(cp, sizeof(line) - (cp - line), "%.8s", 404 sp ? sp->s_name : "*"); 405 else 406 snprintf(cp, sizeof(line) - (cp - line), "%d", 407 ntohs((u_short)port)); 408 /* pad to full column to clear any garbage */ 409 cp = strchr(line, '\0'); 410 while (cp - line < 22) 411 *cp++ = ' '; 412 line[22] = '\0'; 413 waddstr(wnd, line); 414 } 415 416 /* 417 * Construct an Internet address representation. 418 * If the nflag has been supplied, give 419 * numeric value, otherwise try for symbolic name. 420 */ 421 static char * 422 inetname(struct in_addr in) 423 { 424 char *cp = 0; 425 static char line[50]; 426 struct hostent *hp; 427 struct netent *np; 428 429 if (!nflag && in.s_addr != INADDR_ANY) { 430 int net = inet_netof(in); 431 int lna = inet_lnaof(in); 432 433 if (lna == INADDR_ANY) { 434 np = getnetbyaddr(net, AF_INET); 435 if (np) 436 cp = np->n_name; 437 } 438 if (cp == 0) { 439 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 440 if (hp) 441 cp = hp->h_name; 442 } 443 } 444 if (in.s_addr == INADDR_ANY) 445 strcpy(line, "*"); 446 else if (cp) 447 snprintf(line, sizeof(line), "%s", cp); 448 else { 449 in.s_addr = ntohl(in.s_addr); 450 #define C(x) ((x) & 0xff) 451 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24), 452 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 453 } 454 return (line); 455 } 456 457 int 458 cmdnetstat(char *cmd, char *args) 459 { 460 register struct netinfo *p; 461 462 if (prefix(cmd, "all")) { 463 aflag = !aflag; 464 goto fixup; 465 } 466 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 467 int new; 468 469 new = prefix(cmd, "numbers"); 470 if (new == nflag) 471 return (1); 472 p = netcb.ni_forw; 473 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 474 if (p->ni_line == -1) 475 continue; 476 p->ni_flags |= NIF_LACHG|NIF_FACHG; 477 } 478 nflag = new; 479 goto redisplay; 480 } 481 if (!netcmd(cmd, args)) 482 return (0); 483 fixup: 484 fetchnetstat(); 485 redisplay: 486 shownetstat(); 487 refresh(); 488 return (1); 489 } 490