netstat.c revision 1.7
1 /* $NetBSD: netstat.c,v 1.7 1997/07/21 07:05:06 mrg 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 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: netstat.c,v 1.7 1997/07/21 07:05:06 mrg Exp $"); 42 #endif /* not lint */ 43 44 /* 45 * netstat 46 */ 47 #include <sys/param.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/mbuf.h> 51 #include <sys/protosw.h> 52 53 #include <netinet/in.h> 54 55 #include <arpa/inet.h> 56 #include <net/route.h> 57 58 #include <netinet/in_systm.h> 59 #include <netinet/ip.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_icmp.h> 62 #include <netinet/icmp_var.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/tcp.h> 65 #include <netinet/tcpip.h> 66 #include <netinet/tcp_seq.h> 67 #define TCPSTATES 68 #include <netinet/tcp_fsm.h> 69 #include <netinet/tcp_timer.h> 70 #include <netinet/tcp_var.h> 71 #include <netinet/tcp_debug.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 75 #include <netdb.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <nlist.h> 79 #include <paths.h> 80 #include "systat.h" 81 #include "extern.h" 82 83 static void enter __P((struct inpcb *, struct socket *, int, char *)); 84 static char *inetname __P((struct in_addr)); 85 static void inetprint __P((struct in_addr *, int, char *)); 86 87 #define streq(a,b) (strcmp(a,b)==0) 88 89 WINDOW * 90 opennetstat() 91 { 92 sethostent(1); 93 setnetent(1); 94 return (subwin(stdscr, LINES-5-1, 0, 5, 0)); 95 } 96 97 struct netinfo { 98 struct netinfo *ni_forw, *ni_prev; 99 short ni_line; /* line on screen */ 100 short ni_seen; /* 0 when not present in list */ 101 short ni_flags; 102 #define NIF_LACHG 0x1 /* local address changed */ 103 #define NIF_FACHG 0x2 /* foreign address changed */ 104 short ni_state; /* tcp state */ 105 char *ni_proto; /* protocol */ 106 struct in_addr ni_laddr; /* local address */ 107 long ni_lport; /* local port */ 108 struct in_addr ni_faddr; /* foreign address */ 109 long ni_fport; /* foreign port */ 110 long ni_rcvcc; /* rcv buffer character count */ 111 long ni_sndcc; /* snd buffer character count */ 112 }; 113 114 static struct { 115 struct netinfo *ni_forw, *ni_prev; 116 } netcb; 117 118 static int aflag = 0; 119 static int nflag = 0; 120 static int lastrow = 1; 121 static void enter __P((struct inpcb *, struct socket *, int, char *)); 122 static void inetprint __P((struct in_addr *, int, char *)); 123 static char *inetname __P((struct in_addr)); 124 125 void 126 closenetstat(w) 127 WINDOW *w; 128 { 129 register struct netinfo *p; 130 131 endhostent(); 132 endnetent(); 133 p = (struct netinfo *)netcb.ni_forw; 134 while (p != (struct netinfo *)&netcb) { 135 if (p->ni_line != -1) 136 lastrow--; 137 p->ni_line = -1; 138 p = p->ni_forw; 139 } 140 if (w != NULL) { 141 wclear(w); 142 wrefresh(w); 143 delwin(w); 144 } 145 } 146 147 static struct nlist namelist[] = { 148 #define X_TCBTABLE 0 149 { "_tcbtable" }, 150 #define X_UDBTABLE 1 151 { "_udbtable" }, 152 { "" }, 153 }; 154 155 int 156 initnetstat() 157 { 158 if (kvm_nlist(kd, namelist)) { 159 nlisterr(namelist); 160 return(0); 161 } 162 if (namelist[X_TCBTABLE].n_value == 0) { 163 error("No symbols in namelist"); 164 return(0); 165 } 166 netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb; 167 protos = TCP|UDP; 168 return(1); 169 } 170 171 void 172 fetchnetstat() 173 { 174 struct inpcbtable pcbtable; 175 register struct inpcb *head, *prev, *next; 176 register struct netinfo *p; 177 struct inpcb inpcb; 178 struct socket sockb; 179 struct tcpcb tcpcb; 180 void *off; 181 int istcp; 182 183 if (namelist[X_TCBTABLE].n_value == 0) 184 return; 185 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) 186 p->ni_seen = 0; 187 if (protos&TCP) { 188 off = NPTR(X_TCBTABLE); 189 istcp = 1; 190 } 191 else if (protos&UDP) { 192 off = NPTR(X_UDBTABLE); 193 istcp = 0; 194 } 195 else { 196 error("No protocols to display"); 197 return; 198 } 199 again: 200 KREAD(off, &pcbtable, sizeof (struct inpcbtable)); 201 prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue; 202 next = pcbtable.inpt_queue.cqh_first; 203 while (next != head) { 204 KREAD(next, &inpcb, sizeof (inpcb)); 205 if (inpcb.inp_queue.cqe_prev != prev) { 206 printf("prev = %p, head = %p, next = %p, inpcb...prev = %p\n", prev, head, next, inpcb.inp_queue.cqe_prev); 207 p = netcb.ni_forw; 208 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) 209 p->ni_seen = 1; 210 error("Kernel state in transition"); 211 return; 212 } 213 prev = next; 214 next = inpcb.inp_queue.cqe_next; 215 216 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 217 continue; 218 if (nhosts && !checkhost(&inpcb)) 219 continue; 220 if (nports && !checkport(&inpcb)) 221 continue; 222 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 223 if (istcp) { 224 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 225 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 226 } else 227 enter(&inpcb, &sockb, 0, "udp"); 228 } 229 if (istcp && (protos&UDP)) { 230 istcp = 0; 231 off = NPTR(X_UDBTABLE); 232 goto again; 233 } 234 } 235 236 static void 237 enter(inp, so, state, proto) 238 struct inpcb *inp; 239 struct socket *so; 240 int state; 241 char *proto; 242 { 243 register struct netinfo *p; 244 245 /* 246 * Only take exact matches, any sockets with 247 * previously unbound addresses will be deleted 248 * below in the display routine because they 249 * will appear as ``not seen'' in the kernel 250 * data structures. 251 */ 252 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 253 if (!streq(proto, p->ni_proto)) 254 continue; 255 if (p->ni_lport != inp->inp_lport || 256 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 257 continue; 258 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 259 p->ni_fport == inp->inp_fport) 260 break; 261 } 262 if (p == (struct netinfo *)&netcb) { 263 if ((p = malloc(sizeof(*p))) == NULL) { 264 error("Out of memory"); 265 return; 266 } 267 p->ni_prev = (struct netinfo *)&netcb; 268 p->ni_forw = netcb.ni_forw; 269 netcb.ni_forw->ni_prev = p; 270 netcb.ni_forw = p; 271 p->ni_line = -1; 272 p->ni_laddr = inp->inp_laddr; 273 p->ni_lport = inp->inp_lport; 274 p->ni_faddr = inp->inp_faddr; 275 p->ni_fport = inp->inp_fport; 276 p->ni_proto = proto; 277 p->ni_flags = NIF_LACHG|NIF_FACHG; 278 } 279 p->ni_rcvcc = so->so_rcv.sb_cc; 280 p->ni_sndcc = so->so_snd.sb_cc; 281 p->ni_state = state; 282 p->ni_seen = 1; 283 } 284 285 /* column locations */ 286 #define LADDR 0 287 #define FADDR LADDR+23 288 #define PROTO FADDR+23 289 #define RCVCC PROTO+6 290 #define SNDCC RCVCC+7 291 #define STATE SNDCC+7 292 293 294 void 295 labelnetstat() 296 { 297 if (namelist[X_TCBTABLE].n_type == 0) 298 return; 299 wmove(wnd, 0, 0); wclrtobot(wnd); 300 mvwaddstr(wnd, 0, LADDR, "Local Address"); 301 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 302 mvwaddstr(wnd, 0, PROTO, "Proto"); 303 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 304 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 305 mvwaddstr(wnd, 0, STATE, "(state)"); 306 } 307 308 void 309 shownetstat() 310 { 311 register struct netinfo *p, *q; 312 313 /* 314 * First, delete any connections that have gone 315 * away and adjust the position of connections 316 * below to reflect the deleted line. 317 */ 318 p = netcb.ni_forw; 319 while (p != (struct netinfo *)&netcb) { 320 if (p->ni_line == -1 || p->ni_seen) { 321 p = p->ni_forw; 322 continue; 323 } 324 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 325 q = netcb.ni_forw; 326 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 327 if (q != p && q->ni_line > p->ni_line) { 328 q->ni_line--; 329 /* this shouldn't be necessary */ 330 q->ni_flags |= NIF_LACHG|NIF_FACHG; 331 } 332 lastrow--; 333 q = p->ni_forw; 334 p->ni_prev->ni_forw = p->ni_forw; 335 p->ni_forw->ni_prev = p->ni_prev; 336 free(p); 337 p = q; 338 } 339 /* 340 * Update existing connections and add new ones. 341 */ 342 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 343 if (p->ni_line == -1) { 344 /* 345 * Add a new entry if possible. 346 */ 347 if (lastrow > getmaxy(wnd)) 348 continue; 349 p->ni_line = lastrow++; 350 p->ni_flags |= NIF_LACHG|NIF_FACHG; 351 } 352 if (p->ni_flags & NIF_LACHG) { 353 wmove(wnd, p->ni_line, LADDR); 354 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 355 p->ni_flags &= ~NIF_LACHG; 356 } 357 if (p->ni_flags & NIF_FACHG) { 358 wmove(wnd, p->ni_line, FADDR); 359 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 360 p->ni_flags &= ~NIF_FACHG; 361 } 362 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 363 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 364 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 365 if (streq(p->ni_proto, "tcp")) 366 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 367 mvwprintw(wnd, p->ni_line, STATE, "%d", 368 p->ni_state); 369 else 370 mvwaddstr(wnd, p->ni_line, STATE, 371 tcpstates[p->ni_state]); 372 wclrtoeol(wnd); 373 } 374 if (lastrow < getmaxy(wnd)) { 375 wmove(wnd, lastrow, 0); wclrtobot(wnd); 376 wmove(wnd, getmaxy(wnd), 0); wdeleteln(wnd); /* XXX */ 377 } 378 } 379 380 /* 381 * Pretty print an Internet address (net address + port). 382 * If the nflag was specified, use numbers instead of names. 383 */ 384 static void 385 inetprint(in, port, proto) 386 struct in_addr *in; 387 int port; 388 char *proto; 389 { 390 struct servent *sp = 0; 391 char line[80], *cp; 392 393 sprintf(line, "%.*s.", 16, inetname(*in)); 394 cp = index(line, '\0'); 395 if (!nflag && port) 396 sp = getservbyport(port, proto); 397 if (sp || port == 0) 398 sprintf(cp, "%.8s", sp ? sp->s_name : "*"); 399 else 400 sprintf(cp, "%d", ntohs((u_short)port)); 401 /* pad to full column to clear any garbage */ 402 cp = index(line, '\0'); 403 while (cp - line < 22) 404 *cp++ = ' '; 405 *cp = '\0'; 406 waddstr(wnd, line); 407 } 408 409 /* 410 * Construct an Internet address representation. 411 * If the nflag has been supplied, give 412 * numeric value, otherwise try for symbolic name. 413 */ 414 static char * 415 inetname(in) 416 struct in_addr in; 417 { 418 char *cp = 0; 419 static char line[50]; 420 struct hostent *hp; 421 struct netent *np; 422 423 if (!nflag && in.s_addr != INADDR_ANY) { 424 int net = inet_netof(in); 425 int lna = inet_lnaof(in); 426 427 if (lna == INADDR_ANY) { 428 np = getnetbyaddr(net, AF_INET); 429 if (np) 430 cp = np->n_name; 431 } 432 if (cp == 0) { 433 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 434 if (hp) 435 cp = hp->h_name; 436 } 437 } 438 if (in.s_addr == INADDR_ANY) 439 strcpy(line, "*"); 440 else if (cp) 441 strcpy(line, cp); 442 else { 443 in.s_addr = ntohl(in.s_addr); 444 #define C(x) ((x) & 0xff) 445 sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), 446 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 447 } 448 return (line); 449 } 450 451 int 452 cmdnetstat(cmd, args) 453 char *cmd, *args; 454 { 455 register struct netinfo *p; 456 457 if (prefix(cmd, "all")) { 458 aflag = !aflag; 459 goto fixup; 460 } 461 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 462 int new; 463 464 new = prefix(cmd, "numbers"); 465 if (new == nflag) 466 return (1); 467 p = netcb.ni_forw; 468 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 469 if (p->ni_line == -1) 470 continue; 471 p->ni_flags |= NIF_LACHG|NIF_FACHG; 472 } 473 nflag = new; 474 wclear(wnd); 475 labelnetstat(); 476 goto redisplay; 477 } 478 if (!netcmd(cmd, args)) 479 return (0); 480 fixup: 481 fetchnetstat(); 482 redisplay: 483 shownetstat(); 484 refresh(); 485 return (1); 486 } 487
Indexes created Tue Sep 23 14:10:03 GMT 2025