netstat.c revision 1.3
1 /* $NetBSD: netstat.c,v 1.3 1995/06/18 23:53:07 cgd 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 1.3 1995/06/18 23:53:07 cgd 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_TCBTABLE 0 145 { "_tcbtable" }, 146 #define X_UDBTABLE 1 147 { "_udbtable" }, 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_TCBTABLE].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 struct inpcbtable pcbtable; 171 register struct inpcb *head, *prev, *next; 172 register struct netinfo *p; 173 struct inpcb inpcb; 174 struct socket sockb; 175 struct tcpcb tcpcb; 176 void *off; 177 int istcp; 178 179 if (namelist[X_TCBTABLE].n_value == 0) 180 return; 181 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) 182 p->ni_seen = 0; 183 if (protos&TCP) { 184 off = NPTR(X_TCBTABLE); 185 istcp = 1; 186 } 187 else if (protos&UDP) { 188 off = NPTR(X_UDBTABLE); 189 istcp = 0; 190 } 191 else { 192 error("No protocols to display"); 193 return; 194 } 195 again: 196 KREAD(off, &pcbtable, sizeof (struct inpcbtable)); 197 prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue; 198 next = pcbtable.inpt_queue.cqh_first; 199 while (next != head) { 200 KREAD(next, &inpcb, sizeof (inpcb)); 201 if (inpcb.inp_queue.cqe_prev != prev) { 202 printf("prev = %x, head = %x, next = %x, inpcb...prev = %x\n", prev, head, next, inpcb.inp_queue.cqe_prev); 203 p = netcb.ni_forw; 204 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) 205 p->ni_seen = 1; 206 error("Kernel state in transition"); 207 return; 208 } 209 prev = next; 210 next = inpcb.inp_queue.cqe_next; 211 212 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 213 continue; 214 if (nhosts && !checkhost(&inpcb)) 215 continue; 216 if (nports && !checkport(&inpcb)) 217 continue; 218 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 219 if (istcp) { 220 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 221 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 222 } else 223 enter(&inpcb, &sockb, 0, "udp"); 224 } 225 if (istcp && (protos&UDP)) { 226 istcp = 0; 227 off = NPTR(X_UDBTABLE); 228 goto again; 229 } 230 } 231 232 static void 233 enter(inp, so, state, proto) 234 register struct inpcb *inp; 235 register struct socket *so; 236 int state; 237 char *proto; 238 { 239 register struct netinfo *p; 240 241 /* 242 * Only take exact matches, any sockets with 243 * previously unbound addresses will be deleted 244 * below in the display routine because they 245 * will appear as ``not seen'' in the kernel 246 * data structures. 247 */ 248 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 249 if (!streq(proto, p->ni_proto)) 250 continue; 251 if (p->ni_lport != inp->inp_lport || 252 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 253 continue; 254 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 255 p->ni_fport == inp->inp_fport) 256 break; 257 } 258 if (p == (struct netinfo *)&netcb) { 259 if ((p = malloc(sizeof(*p))) == NULL) { 260 error("Out of memory"); 261 return; 262 } 263 p->ni_prev = (struct netinfo *)&netcb; 264 p->ni_forw = netcb.ni_forw; 265 netcb.ni_forw->ni_prev = p; 266 netcb.ni_forw = p; 267 p->ni_line = -1; 268 p->ni_laddr = inp->inp_laddr; 269 p->ni_lport = inp->inp_lport; 270 p->ni_faddr = inp->inp_faddr; 271 p->ni_fport = inp->inp_fport; 272 p->ni_proto = proto; 273 p->ni_flags = NIF_LACHG|NIF_FACHG; 274 } 275 p->ni_rcvcc = so->so_rcv.sb_cc; 276 p->ni_sndcc = so->so_snd.sb_cc; 277 p->ni_state = state; 278 p->ni_seen = 1; 279 } 280 281 /* column locations */ 282 #define LADDR 0 283 #define FADDR LADDR+23 284 #define PROTO FADDR+23 285 #define RCVCC PROTO+6 286 #define SNDCC RCVCC+7 287 #define STATE SNDCC+7 288 289 290 void 291 labelnetstat() 292 { 293 if (namelist[X_TCBTABLE].n_type == 0) 294 return; 295 wmove(wnd, 0, 0); wclrtobot(wnd); 296 mvwaddstr(wnd, 0, LADDR, "Local Address"); 297 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 298 mvwaddstr(wnd, 0, PROTO, "Proto"); 299 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 300 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 301 mvwaddstr(wnd, 0, STATE, "(state)"); 302 } 303 304 void 305 shownetstat() 306 { 307 register struct netinfo *p, *q; 308 309 /* 310 * First, delete any connections that have gone 311 * away and adjust the position of connections 312 * below to reflect the deleted line. 313 */ 314 p = netcb.ni_forw; 315 while (p != (struct netinfo *)&netcb) { 316 if (p->ni_line == -1 || p->ni_seen) { 317 p = p->ni_forw; 318 continue; 319 } 320 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 321 q = netcb.ni_forw; 322 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 323 if (q != p && q->ni_line > p->ni_line) { 324 q->ni_line--; 325 /* this shouldn't be necessary */ 326 q->ni_flags |= NIF_LACHG|NIF_FACHG; 327 } 328 lastrow--; 329 q = p->ni_forw; 330 p->ni_prev->ni_forw = p->ni_forw; 331 p->ni_forw->ni_prev = p->ni_prev; 332 free(p); 333 p = q; 334 } 335 /* 336 * Update existing connections and add new ones. 337 */ 338 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 339 if (p->ni_line == -1) { 340 /* 341 * Add a new entry if possible. 342 */ 343 if (lastrow > YMAX(wnd)) 344 continue; 345 p->ni_line = lastrow++; 346 p->ni_flags |= NIF_LACHG|NIF_FACHG; 347 } 348 if (p->ni_flags & NIF_LACHG) { 349 wmove(wnd, p->ni_line, LADDR); 350 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 351 p->ni_flags &= ~NIF_LACHG; 352 } 353 if (p->ni_flags & NIF_FACHG) { 354 wmove(wnd, p->ni_line, FADDR); 355 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 356 p->ni_flags &= ~NIF_FACHG; 357 } 358 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 359 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 360 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 361 if (streq(p->ni_proto, "tcp")) 362 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 363 mvwprintw(wnd, p->ni_line, STATE, "%d", 364 p->ni_state); 365 else 366 mvwaddstr(wnd, p->ni_line, STATE, 367 tcpstates[p->ni_state]); 368 wclrtoeol(wnd); 369 } 370 if (lastrow < YMAX(wnd)) { 371 wmove(wnd, lastrow, 0); wclrtobot(wnd); 372 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */ 373 } 374 } 375 376 /* 377 * Pretty print an Internet address (net address + port). 378 * If the nflag was specified, use numbers instead of names. 379 */ 380 static void 381 inetprint(in, port, proto) 382 register struct in_addr *in; 383 int port; 384 char *proto; 385 { 386 struct servent *sp = 0; 387 char line[80], *cp, *index(); 388 389 sprintf(line, "%.*s.", 16, inetname(*in)); 390 cp = index(line, '\0'); 391 if (!nflag && port) 392 sp = getservbyport(port, proto); 393 if (sp || port == 0) 394 sprintf(cp, "%.8s", sp ? sp->s_name : "*"); 395 else 396 sprintf(cp, "%d", ntohs((u_short)port)); 397 /* pad to full column to clear any garbage */ 398 cp = index(line, '\0'); 399 while (cp - line < 22) 400 *cp++ = ' '; 401 *cp = '\0'; 402 waddstr(wnd, line); 403 } 404 405 /* 406 * Construct an Internet address representation. 407 * If the nflag has been supplied, give 408 * numeric value, otherwise try for symbolic name. 409 */ 410 static char * 411 inetname(in) 412 struct in_addr in; 413 { 414 char *cp = 0; 415 static char line[50]; 416 struct hostent *hp; 417 struct netent *np; 418 419 if (!nflag && in.s_addr != INADDR_ANY) { 420 int net = inet_netof(in); 421 int lna = inet_lnaof(in); 422 423 if (lna == INADDR_ANY) { 424 np = getnetbyaddr(net, AF_INET); 425 if (np) 426 cp = np->n_name; 427 } 428 if (cp == 0) { 429 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 430 if (hp) 431 cp = hp->h_name; 432 } 433 } 434 if (in.s_addr == INADDR_ANY) 435 strcpy(line, "*"); 436 else if (cp) 437 strcpy(line, cp); 438 else { 439 in.s_addr = ntohl(in.s_addr); 440 #define C(x) ((x) & 0xff) 441 sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), 442 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 443 } 444 return (line); 445 } 446 447 int 448 cmdnetstat(cmd, args) 449 char *cmd, *args; 450 { 451 register struct netinfo *p; 452 453 if (prefix(cmd, "all")) { 454 aflag = !aflag; 455 goto fixup; 456 } 457 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 458 int new; 459 460 new = prefix(cmd, "numbers"); 461 if (new == nflag) 462 return (1); 463 p = netcb.ni_forw; 464 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 465 if (p->ni_line == -1) 466 continue; 467 p->ni_flags |= NIF_LACHG|NIF_FACHG; 468 } 469 nflag = new; 470 goto redisplay; 471 } 472 if (!netcmd(cmd, args)) 473 return (0); 474 fixup: 475 fetchnetstat(); 476 redisplay: 477 shownetstat(); 478 refresh(); 479 return (1); 480 } 481
Indexes created Mon Sep 22 13:09:51 GMT 2025