1 /* $NetBSD: netstat.c,v 1.2 1995/01/20 08:52:05 jtc Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93"; 39 #endif 40 static char rcsid[] = "$NetBSD: netstat.c,v 1.2 1995/01/20 08:52:05 jtc Exp $"; 41 #endif /* not lint */ 42 43 /* 44 * netstat 45 */ 46 #include <sys/param.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/mbuf.h> 50 #include <sys/protosw.h> 51 52 #include <netinet/in.h> 53 #include <net/route.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 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 <netdb.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <nlist.h> 75 #include <paths.h> 76 #include "systat.h" 77 #include "extern.h" 78 79 static void enter __P((struct inpcb *, struct socket *, int, char *)); 80 static char *inetname __P((struct in_addr)); 81 static void inetprint __P((struct in_addr *, int, char *)); 82 83 #define streq(a,b) (strcmp(a,b)==0) 84 #define YMAX(w) ((w)->maxy-1) 85 86 WINDOW * 87 opennetstat() 88 { 89 sethostent(1); 90 setnetent(1); 91 return (subwin(stdscr, LINES-5-1, 0, 5, 0)); 92 } 93 94 struct netinfo { 95 struct netinfo *ni_forw, *ni_prev; 96 short ni_line; /* line on screen */ 97 short ni_seen; /* 0 when not present in list */ 98 short ni_flags; 99 #define NIF_LACHG 0x1 /* local address changed */ 100 #define NIF_FACHG 0x2 /* foreign address changed */ 101 short ni_state; /* tcp state */ 102 char *ni_proto; /* protocol */ 103 struct in_addr ni_laddr; /* local address */ 104 long ni_lport; /* local port */ 105 struct in_addr ni_faddr; /* foreign address */ 106 long ni_fport; /* foreign port */ 107 long ni_rcvcc; /* rcv buffer character count */ 108 long ni_sndcc; /* snd buffer character count */ 109 }; 110 111 static struct { 112 struct netinfo *ni_forw, *ni_prev; 113 } netcb; 114 115 static int aflag = 0; 116 static int nflag = 0; 117 static int lastrow = 1; 118 static void enter(), inetprint(); 119 static char *inetname(); 120 121 void 122 closenetstat(w) 123 WINDOW *w; 124 { 125 register struct netinfo *p; 126 127 endhostent(); 128 endnetent(); 129 p = (struct netinfo *)netcb.ni_forw; 130 while (p != (struct netinfo *)&netcb) { 131 if (p->ni_line != -1) 132 lastrow--; 133 p->ni_line = -1; 134 p = p->ni_forw; 135 } 136 if (w != NULL) { 137 wclear(w); 138 wrefresh(w); 139 delwin(w); 140 } 141 } 142 143 static struct nlist namelist[] = { 144 #define X_TCB 0 145 { "_tcb" }, 146 #define X_UDB 1 147 { "_udb" }, 148 { "" }, 149 }; 150 151 int 152 initnetstat() 153 { 154 if (kvm_nlist(kd, namelist)) { 155 nlisterr(namelist); 156 return(0); 157 } 158 if (namelist[X_TCB].n_value == 0) { 159 error("No symbols in namelist"); 160 return(0); 161 } 162 netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb; 163 protos = TCP|UDP; 164 return(1); 165 } 166 167 void 168 fetchnetstat() 169 { 170 register struct inpcb *prev, *next; 171 register struct netinfo *p; 172 struct inpcb inpcb; 173 struct socket sockb; 174 struct tcpcb tcpcb; 175 void *off; 176 int istcp; 177 178 if (namelist[X_TCB].n_value == 0) 179 return; 180 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) 181 p->ni_seen = 0; 182 if (protos&TCP) { 183 off = NPTR(X_TCB); 184 istcp = 1; 185 } 186 else if (protos&UDP) { 187 off = NPTR(X_UDB); 188 istcp = 0; 189 } 190 else { 191 error("No protocols to display"); 192 return; 193 } 194 again: 195 KREAD(off, &inpcb, sizeof (struct inpcb)); 196 prev = off; 197 for (; inpcb.inp_next != off; prev = next) { 198 next = inpcb.inp_next; 199 KREAD(next, &inpcb, sizeof (inpcb)); 200 if (inpcb.inp_prev != prev) { 201 p = netcb.ni_forw; 202 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) 203 p->ni_seen = 1; 204 error("Kernel state in transition"); 205 return; 206 } 207 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 208 continue; 209 if (nhosts && !checkhost(&inpcb)) 210 continue; 211 if (nports && !checkport(&inpcb)) 212 continue; 213 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 214 if (istcp) { 215 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 216 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 217 } else 218 enter(&inpcb, &sockb, 0, "udp"); 219 } 220 if (istcp && (protos&UDP)) { 221 istcp = 0; 222 off = NPTR(X_UDB); 223 goto again; 224 } 225 } 226 227 static void 228 enter(inp, so, state, proto) 229 register struct inpcb *inp; 230 register struct socket *so; 231 int state; 232 char *proto; 233 { 234 register struct netinfo *p; 235 236 /* 237 * Only take exact matches, any sockets with 238 * previously unbound addresses will be deleted 239 * below in the display routine because they 240 * will appear as ``not seen'' in the kernel 241 * data structures. 242 */ 243 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 244 if (!streq(proto, p->ni_proto)) 245 continue; 246 if (p->ni_lport != inp->inp_lport || 247 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 248 continue; 249 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 250 p->ni_fport == inp->inp_fport) 251 break; 252 } 253 if (p == (struct netinfo *)&netcb) { 254 if ((p = malloc(sizeof(*p))) == NULL) { 255 error("Out of memory"); 256 return; 257 } 258 p->ni_prev = (struct netinfo *)&netcb; 259 p->ni_forw = netcb.ni_forw; 260 netcb.ni_forw->ni_prev = p; 261 netcb.ni_forw = p; 262 p->ni_line = -1; 263 p->ni_laddr = inp->inp_laddr; 264 p->ni_lport = inp->inp_lport; 265 p->ni_faddr = inp->inp_faddr; 266 p->ni_fport = inp->inp_fport; 267 p->ni_proto = proto; 268 p->ni_flags = NIF_LACHG|NIF_FACHG; 269 } 270 p->ni_rcvcc = so->so_rcv.sb_cc; 271 p->ni_sndcc = so->so_snd.sb_cc; 272 p->ni_state = state; 273 p->ni_seen = 1; 274 } 275 276 /* column locations */ 277 #define LADDR 0 278 #define FADDR LADDR+23 279 #define PROTO FADDR+23 280 #define RCVCC PROTO+6 281 #define SNDCC RCVCC+7 282 #define STATE SNDCC+7 283 284 285 void 286 labelnetstat() 287 { 288 if (namelist[X_TCB].n_type == 0) 289 return; 290 wmove(wnd, 0, 0); wclrtobot(wnd); 291 mvwaddstr(wnd, 0, LADDR, "Local Address"); 292 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 293 mvwaddstr(wnd, 0, PROTO, "Proto"); 294 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 295 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 296 mvwaddstr(wnd, 0, STATE, "(state)"); 297 } 298 299 void 300 shownetstat() 301 { 302 register struct netinfo *p, *q; 303 304 /* 305 * First, delete any connections that have gone 306 * away and adjust the position of connections 307 * below to reflect the deleted line. 308 */ 309 p = netcb.ni_forw; 310 while (p != (struct netinfo *)&netcb) { 311 if (p->ni_line == -1 || p->ni_seen) { 312 p = p->ni_forw; 313 continue; 314 } 315 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 316 q = netcb.ni_forw; 317 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 318 if (q != p && q->ni_line > p->ni_line) { 319 q->ni_line--; 320 /* this shouldn't be necessary */ 321 q->ni_flags |= NIF_LACHG|NIF_FACHG; 322 } 323 lastrow--; 324 q = p->ni_forw; 325 p->ni_prev->ni_forw = p->ni_forw; 326 p->ni_forw->ni_prev = p->ni_prev; 327 free(p); 328 p = q; 329 } 330 /* 331 * Update existing connections and add new ones. 332 */ 333 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 334 if (p->ni_line == -1) { 335 /* 336 * Add a new entry if possible. 337 */ 338 if (lastrow > YMAX(wnd)) 339 continue; 340 p->ni_line = lastrow++; 341 p->ni_flags |= NIF_LACHG|NIF_FACHG; 342 } 343 if (p->ni_flags & NIF_LACHG) { 344 wmove(wnd, p->ni_line, LADDR); 345 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 346 p->ni_flags &= ~NIF_LACHG; 347 } 348 if (p->ni_flags & NIF_FACHG) { 349 wmove(wnd, p->ni_line, FADDR); 350 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 351 p->ni_flags &= ~NIF_FACHG; 352 } 353 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 354 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 355 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 356 if (streq(p->ni_proto, "tcp")) 357 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 358 mvwprintw(wnd, p->ni_line, STATE, "%d", 359 p->ni_state); 360 else 361 mvwaddstr(wnd, p->ni_line, STATE, 362 tcpstates[p->ni_state]); 363 wclrtoeol(wnd); 364 } 365 if (lastrow < YMAX(wnd)) { 366 wmove(wnd, lastrow, 0); wclrtobot(wnd); 367 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */ 368 } 369 } 370 371 /* 372 * Pretty print an Internet address (net address + port). 373 * If the nflag was specified, use numbers instead of names. 374 */ 375 static void 376 inetprint(in, port, proto) 377 register struct in_addr *in; 378 int port; 379 char *proto; 380 { 381 struct servent *sp = 0; 382 char line[80], *cp, *index(); 383 384 sprintf(line, "%.*s.", 16, inetname(*in)); 385 cp = index(line, '\0'); 386 if (!nflag && port) 387 sp = getservbyport(port, proto); 388 if (sp || port == 0) 389 sprintf(cp, "%.8s", sp ? sp->s_name : "*"); 390 else 391 sprintf(cp, "%d", ntohs((u_short)port)); 392 /* pad to full column to clear any garbage */ 393 cp = index(line, '\0'); 394 while (cp - line < 22) 395 *cp++ = ' '; 396 *cp = '\0'; 397 waddstr(wnd, line); 398 } 399 400 /* 401 * Construct an Internet address representation. 402 * If the nflag has been supplied, give 403 * numeric value, otherwise try for symbolic name. 404 */ 405 static char * 406 inetname(in) 407 struct in_addr in; 408 { 409 char *cp = 0; 410 static char line[50]; 411 struct hostent *hp; 412 struct netent *np; 413 414 if (!nflag && in.s_addr != INADDR_ANY) { 415 int net = inet_netof(in); 416 int lna = inet_lnaof(in); 417 418 if (lna == INADDR_ANY) { 419 np = getnetbyaddr(net, AF_INET); 420 if (np) 421 cp = np->n_name; 422 } 423 if (cp == 0) { 424 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 425 if (hp) 426 cp = hp->h_name; 427 } 428 } 429 if (in.s_addr == INADDR_ANY) 430 strcpy(line, "*"); 431 else if (cp) 432 strcpy(line, cp); 433 else { 434 in.s_addr = ntohl(in.s_addr); 435 #define C(x) ((x) & 0xff) 436 sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), 437 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 438 } 439 return (line); 440 } 441 442 int 443 cmdnetstat(cmd, args) 444 char *cmd, *args; 445 { 446 register struct netinfo *p; 447 448 if (prefix(cmd, "all")) { 449 aflag = !aflag; 450 goto fixup; 451 } 452 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 453 int new; 454 455 new = prefix(cmd, "numbers"); 456 if (new == nflag) 457 return (1); 458 p = netcb.ni_forw; 459 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 460 if (p->ni_line == -1) 461 continue; 462 p->ni_flags |= NIF_LACHG|NIF_FACHG; 463 } 464 nflag = new; 465 goto redisplay; 466 } 467 if (!netcmd(cmd, args)) 468 return (0); 469 fixup: 470 fetchnetstat(); 471 redisplay: 472 shownetstat(); 473 refresh(); 474 return (1); 475 } 476