netstat.c revision 1.6
1 /* $NetBSD: netstat.c,v 1.6 1997/05/24 00:48:28 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 1.6 1997/05/24 00:48:28 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 85 WINDOW * 86 opennetstat() 87 { 88 sethostent(1); 89 setnetent(1); 90 return (subwin(stdscr, LINES-5-1, 0, 5, 0)); 91 } 92 93 struct netinfo { 94 struct netinfo *ni_forw, *ni_prev; 95 short ni_line; /* line on screen */ 96 short ni_seen; /* 0 when not present in list */ 97 short ni_flags; 98 #define NIF_LACHG 0x1 /* local address changed */ 99 #define NIF_FACHG 0x2 /* foreign address changed */ 100 short ni_state; /* tcp state */ 101 char *ni_proto; /* protocol */ 102 struct in_addr ni_laddr; /* local address */ 103 long ni_lport; /* local port */ 104 struct in_addr ni_faddr; /* foreign address */ 105 long ni_fport; /* foreign port */ 106 long ni_rcvcc; /* rcv buffer character count */ 107 long ni_sndcc; /* snd buffer character count */ 108 }; 109 110 static struct { 111 struct netinfo *ni_forw, *ni_prev; 112 } netcb; 113 114 static int aflag = 0; 115 static int nflag = 0; 116 static int lastrow = 1; 117 static void enter(), inetprint(); 118 static char *inetname(); 119 120 void 121 closenetstat(w) 122 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 static struct nlist namelist[] = { 143 #define X_TCBTABLE 0 144 { "_tcbtable" }, 145 #define X_UDBTABLE 1 146 { "_udbtable" }, 147 { "" }, 148 }; 149 150 int 151 initnetstat() 152 { 153 if (kvm_nlist(kd, namelist)) { 154 nlisterr(namelist); 155 return(0); 156 } 157 if (namelist[X_TCBTABLE].n_value == 0) { 158 error("No symbols in namelist"); 159 return(0); 160 } 161 netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb; 162 protos = TCP|UDP; 163 return(1); 164 } 165 166 void 167 fetchnetstat() 168 { 169 struct inpcbtable pcbtable; 170 register struct inpcb *head, *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_TCBTABLE].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_TCBTABLE); 184 istcp = 1; 185 } 186 else if (protos&UDP) { 187 off = NPTR(X_UDBTABLE); 188 istcp = 0; 189 } 190 else { 191 error("No protocols to display"); 192 return; 193 } 194 again: 195 KREAD(off, &pcbtable, sizeof (struct inpcbtable)); 196 prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue; 197 next = pcbtable.inpt_queue.cqh_first; 198 while (next != head) { 199 KREAD(next, &inpcb, sizeof (inpcb)); 200 if (inpcb.inp_queue.cqe_prev != prev) { 201 printf("prev = %x, head = %x, next = %x, inpcb...prev = %x\n", prev, head, next, inpcb.inp_queue.cqe_prev); 202 p = netcb.ni_forw; 203 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) 204 p->ni_seen = 1; 205 error("Kernel state in transition"); 206 return; 207 } 208 prev = next; 209 next = inpcb.inp_queue.cqe_next; 210 211 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 212 continue; 213 if (nhosts && !checkhost(&inpcb)) 214 continue; 215 if (nports && !checkport(&inpcb)) 216 continue; 217 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 218 if (istcp) { 219 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 220 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 221 } else 222 enter(&inpcb, &sockb, 0, "udp"); 223 } 224 if (istcp && (protos&UDP)) { 225 istcp = 0; 226 off = NPTR(X_UDBTABLE); 227 goto again; 228 } 229 } 230 231 static void 232 enter(inp, so, state, proto) 233 register struct inpcb *inp; 234 register struct socket *so; 235 int state; 236 char *proto; 237 { 238 register struct netinfo *p; 239 240 /* 241 * Only take exact matches, any sockets with 242 * previously unbound addresses will be deleted 243 * below in the display routine because they 244 * will appear as ``not seen'' in the kernel 245 * data structures. 246 */ 247 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 248 if (!streq(proto, p->ni_proto)) 249 continue; 250 if (p->ni_lport != inp->inp_lport || 251 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 252 continue; 253 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 254 p->ni_fport == inp->inp_fport) 255 break; 256 } 257 if (p == (struct netinfo *)&netcb) { 258 if ((p = malloc(sizeof(*p))) == NULL) { 259 error("Out of memory"); 260 return; 261 } 262 p->ni_prev = (struct netinfo *)&netcb; 263 p->ni_forw = netcb.ni_forw; 264 netcb.ni_forw->ni_prev = p; 265 netcb.ni_forw = p; 266 p->ni_line = -1; 267 p->ni_laddr = inp->inp_laddr; 268 p->ni_lport = inp->inp_lport; 269 p->ni_faddr = inp->inp_faddr; 270 p->ni_fport = inp->inp_fport; 271 p->ni_proto = proto; 272 p->ni_flags = NIF_LACHG|NIF_FACHG; 273 } 274 p->ni_rcvcc = so->so_rcv.sb_cc; 275 p->ni_sndcc = so->so_snd.sb_cc; 276 p->ni_state = state; 277 p->ni_seen = 1; 278 } 279 280 /* column locations */ 281 #define LADDR 0 282 #define FADDR LADDR+23 283 #define PROTO FADDR+23 284 #define RCVCC PROTO+6 285 #define SNDCC RCVCC+7 286 #define STATE SNDCC+7 287 288 289 void 290 labelnetstat() 291 { 292 if (namelist[X_TCBTABLE].n_type == 0) 293 return; 294 wmove(wnd, 0, 0); wclrtobot(wnd); 295 mvwaddstr(wnd, 0, LADDR, "Local Address"); 296 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 297 mvwaddstr(wnd, 0, PROTO, "Proto"); 298 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 299 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 300 mvwaddstr(wnd, 0, STATE, "(state)"); 301 } 302 303 void 304 shownetstat() 305 { 306 register struct netinfo *p, *q; 307 308 /* 309 * First, delete any connections that have gone 310 * away and adjust the position of connections 311 * below to reflect the deleted line. 312 */ 313 p = netcb.ni_forw; 314 while (p != (struct netinfo *)&netcb) { 315 if (p->ni_line == -1 || p->ni_seen) { 316 p = p->ni_forw; 317 continue; 318 } 319 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 320 q = netcb.ni_forw; 321 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 322 if (q != p && q->ni_line > p->ni_line) { 323 q->ni_line--; 324 /* this shouldn't be necessary */ 325 q->ni_flags |= NIF_LACHG|NIF_FACHG; 326 } 327 lastrow--; 328 q = p->ni_forw; 329 p->ni_prev->ni_forw = p->ni_forw; 330 p->ni_forw->ni_prev = p->ni_prev; 331 free(p); 332 p = q; 333 } 334 /* 335 * Update existing connections and add new ones. 336 */ 337 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 338 if (p->ni_line == -1) { 339 /* 340 * Add a new entry if possible. 341 */ 342 if (lastrow > getmaxy(wnd)) 343 continue; 344 p->ni_line = lastrow++; 345 p->ni_flags |= NIF_LACHG|NIF_FACHG; 346 } 347 if (p->ni_flags & NIF_LACHG) { 348 wmove(wnd, p->ni_line, LADDR); 349 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 350 p->ni_flags &= ~NIF_LACHG; 351 } 352 if (p->ni_flags & NIF_FACHG) { 353 wmove(wnd, p->ni_line, FADDR); 354 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 355 p->ni_flags &= ~NIF_FACHG; 356 } 357 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 358 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 359 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 360 if (streq(p->ni_proto, "tcp")) 361 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 362 mvwprintw(wnd, p->ni_line, STATE, "%d", 363 p->ni_state); 364 else 365 mvwaddstr(wnd, p->ni_line, STATE, 366 tcpstates[p->ni_state]); 367 wclrtoeol(wnd); 368 } 369 if (lastrow < getmaxy(wnd)) { 370 wmove(wnd, lastrow, 0); wclrtobot(wnd); 371 wmove(wnd, getmaxy(wnd), 0); wdeleteln(wnd); /* XXX */ 372 } 373 } 374 375 /* 376 * Pretty print an Internet address (net address + port). 377 * If the nflag was specified, use numbers instead of names. 378 */ 379 static void 380 inetprint(in, port, proto) 381 register struct in_addr *in; 382 int port; 383 char *proto; 384 { 385 struct servent *sp = 0; 386 char line[80], *cp, *index(); 387 388 sprintf(line, "%.*s.", 16, inetname(*in)); 389 cp = index(line, '\0'); 390 if (!nflag && port) 391 sp = getservbyport(port, proto); 392 if (sp || port == 0) 393 sprintf(cp, "%.8s", sp ? sp->s_name : "*"); 394 else 395 sprintf(cp, "%d", ntohs((u_short)port)); 396 /* pad to full column to clear any garbage */ 397 cp = index(line, '\0'); 398 while (cp - line < 22) 399 *cp++ = ' '; 400 *cp = '\0'; 401 waddstr(wnd, line); 402 } 403 404 /* 405 * Construct an Internet address representation. 406 * If the nflag has been supplied, give 407 * numeric value, otherwise try for symbolic name. 408 */ 409 static char * 410 inetname(in) 411 struct in_addr in; 412 { 413 char *cp = 0; 414 static char line[50]; 415 struct hostent *hp; 416 struct netent *np; 417 418 if (!nflag && in.s_addr != INADDR_ANY) { 419 int net = inet_netof(in); 420 int lna = inet_lnaof(in); 421 422 if (lna == INADDR_ANY) { 423 np = getnetbyaddr(net, AF_INET); 424 if (np) 425 cp = np->n_name; 426 } 427 if (cp == 0) { 428 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 429 if (hp) 430 cp = hp->h_name; 431 } 432 } 433 if (in.s_addr == INADDR_ANY) 434 strcpy(line, "*"); 435 else if (cp) 436 strcpy(line, cp); 437 else { 438 in.s_addr = ntohl(in.s_addr); 439 #define C(x) ((x) & 0xff) 440 sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), 441 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 442 } 443 return (line); 444 } 445 446 int 447 cmdnetstat(cmd, args) 448 char *cmd, *args; 449 { 450 register struct netinfo *p; 451 452 if (prefix(cmd, "all")) { 453 aflag = !aflag; 454 goto fixup; 455 } 456 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 457 int new; 458 459 new = prefix(cmd, "numbers"); 460 if (new == nflag) 461 return (1); 462 p = netcb.ni_forw; 463 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 464 if (p->ni_line == -1) 465 continue; 466 p->ni_flags |= NIF_LACHG|NIF_FACHG; 467 } 468 nflag = new; 469 wclear(wnd); 470 labelnetstat(); 471 goto redisplay; 472 } 473 if (!netcmd(cmd, args)) 474 return (0); 475 fixup: 476 fetchnetstat(); 477 redisplay: 478 shownetstat(); 479 refresh(); 480 return (1); 481 } 482
Indexes created Mon Sep 22 10:09:38 GMT 2025