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 34 #ifndef lint 35 /* 36 static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93"; 37 */ 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 /* 43 * netstat 44 */ 45 #include <sys/param.h> 46 #include <sys/queue.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 51 #include <netinet/in.h> 52 #include <arpa/inet.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 *next; 171 register struct netinfo *p; 172 struct inpcbhead head; 173 struct inpcb inpcb; 174 struct socket sockb; 175 struct tcpcb tcpcb; 176 void *off; 177 int istcp; 178 179 if (namelist[X_TCB].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_TCB); 185 istcp = 1; 186 } 187 else if (protos&UDP) { 188 off = NPTR(X_UDB); 189 istcp = 0; 190 } 191 else { 192 error("No protocols to display"); 193 return; 194 } 195 again: 196 KREAD(off, &head, sizeof (struct inpcbhead)); 197 for (next = head.lh_first; next != NULL; next = inpcb.inp_list.le_next) { 198 KREAD(next, &inpcb, sizeof (inpcb)); 199 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 200 continue; 201 if (nhosts && !checkhost(&inpcb)) 202 continue; 203 if (nports && !checkport(&inpcb)) 204 continue; 205 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 206 if (istcp) { 207 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 208 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 209 } else 210 enter(&inpcb, &sockb, 0, "udp"); 211 } 212 if (istcp && (protos&UDP)) { 213 istcp = 0; 214 off = NPTR(X_UDB); 215 goto again; 216 } 217 } 218 219 static void 220 enter(inp, so, state, proto) 221 register struct inpcb *inp; 222 register struct socket *so; 223 int state; 224 char *proto; 225 { 226 register struct netinfo *p; 227 228 /* 229 * Only take exact matches, any sockets with 230 * previously unbound addresses will be deleted 231 * below in the display routine because they 232 * will appear as ``not seen'' in the kernel 233 * data structures. 234 */ 235 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 236 if (!streq(proto, p->ni_proto)) 237 continue; 238 if (p->ni_lport != inp->inp_lport || 239 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 240 continue; 241 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 242 p->ni_fport == inp->inp_fport) 243 break; 244 } 245 if (p == (struct netinfo *)&netcb) { 246 if ((p = malloc(sizeof(*p))) == NULL) { 247 error("Out of memory"); 248 return; 249 } 250 p->ni_prev = (struct netinfo *)&netcb; 251 p->ni_forw = netcb.ni_forw; 252 netcb.ni_forw->ni_prev = p; 253 netcb.ni_forw = p; 254 p->ni_line = -1; 255 p->ni_laddr = inp->inp_laddr; 256 p->ni_lport = inp->inp_lport; 257 p->ni_faddr = inp->inp_faddr; 258 p->ni_fport = inp->inp_fport; 259 p->ni_proto = proto; 260 p->ni_flags = NIF_LACHG|NIF_FACHG; 261 } 262 p->ni_rcvcc = so->so_rcv.sb_cc; 263 p->ni_sndcc = so->so_snd.sb_cc; 264 p->ni_state = state; 265 p->ni_seen = 1; 266 } 267 268 /* column locations */ 269 #define LADDR 0 270 #define FADDR LADDR+23 271 #define PROTO FADDR+23 272 #define RCVCC PROTO+6 273 #define SNDCC RCVCC+7 274 #define STATE SNDCC+7 275 276 277 void 278 labelnetstat() 279 { 280 if (namelist[X_TCB].n_type == 0) 281 return; 282 wmove(wnd, 0, 0); wclrtobot(wnd); 283 mvwaddstr(wnd, 0, LADDR, "Local Address"); 284 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 285 mvwaddstr(wnd, 0, PROTO, "Proto"); 286 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 287 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 288 mvwaddstr(wnd, 0, STATE, "(state)"); 289 } 290 291 void 292 shownetstat() 293 { 294 register struct netinfo *p, *q; 295 296 /* 297 * First, delete any connections that have gone 298 * away and adjust the position of connections 299 * below to reflect the deleted line. 300 */ 301 p = netcb.ni_forw; 302 while (p != (struct netinfo *)&netcb) { 303 if (p->ni_line == -1 || p->ni_seen) { 304 p = p->ni_forw; 305 continue; 306 } 307 wmove(wnd, p->ni_line, 0); wdeleteln(wnd); 308 q = netcb.ni_forw; 309 for (; q != (struct netinfo *)&netcb; q = q->ni_forw) 310 if (q != p && q->ni_line > p->ni_line) { 311 q->ni_line--; 312 /* this shouldn't be necessary */ 313 q->ni_flags |= NIF_LACHG|NIF_FACHG; 314 } 315 lastrow--; 316 q = p->ni_forw; 317 p->ni_prev->ni_forw = p->ni_forw; 318 p->ni_forw->ni_prev = p->ni_prev; 319 free(p); 320 p = q; 321 } 322 /* 323 * Update existing connections and add new ones. 324 */ 325 for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) { 326 if (p->ni_line == -1) { 327 /* 328 * Add a new entry if possible. 329 */ 330 if (lastrow > YMAX(wnd)) 331 continue; 332 p->ni_line = lastrow++; 333 p->ni_flags |= NIF_LACHG|NIF_FACHG; 334 } 335 if (p->ni_flags & NIF_LACHG) { 336 wmove(wnd, p->ni_line, LADDR); 337 inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto); 338 p->ni_flags &= ~NIF_LACHG; 339 } 340 if (p->ni_flags & NIF_FACHG) { 341 wmove(wnd, p->ni_line, FADDR); 342 inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto); 343 p->ni_flags &= ~NIF_FACHG; 344 } 345 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 346 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc); 347 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc); 348 if (streq(p->ni_proto, "tcp")) 349 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 350 mvwprintw(wnd, p->ni_line, STATE, "%d", 351 p->ni_state); 352 else 353 mvwaddstr(wnd, p->ni_line, STATE, 354 tcpstates[p->ni_state]); 355 wclrtoeol(wnd); 356 } 357 if (lastrow < YMAX(wnd)) { 358 wmove(wnd, lastrow, 0); wclrtobot(wnd); 359 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */ 360 } 361 } 362 363 /* 364 * Pretty print an Internet address (net address + port). 365 * If the nflag was specified, use numbers instead of names. 366 */ 367 static void 368 inetprint(in, port, proto) 369 register struct in_addr *in; 370 int port; 371 char *proto; 372 { 373 struct servent *sp = 0; 374 char line[80], *cp, *index(); 375 376 snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in)); 377 cp = index(line, '\0'); 378 if (!nflag && port) 379 sp = getservbyport(port, proto); 380 if (sp || port == 0) 381 snprintf(cp, sizeof(line) - (cp - line), "%.8s", 382 sp ? sp->s_name : "*"); 383 else 384 snprintf(cp, sizeof(line) - (cp - line), "%d", 385 ntohs((u_short)port)); 386 /* pad to full column to clear any garbage */ 387 cp = index(line, '\0'); 388 while (cp - line < 22) 389 *cp++ = ' '; 390 line[22] = '\0'; 391 waddstr(wnd, line); 392 } 393 394 /* 395 * Construct an Internet address representation. 396 * If the nflag has been supplied, give 397 * numeric value, otherwise try for symbolic name. 398 */ 399 static char * 400 inetname(in) 401 struct in_addr in; 402 { 403 char *cp = 0; 404 static char line[50]; 405 struct hostent *hp; 406 struct netent *np; 407 408 if (!nflag && in.s_addr != INADDR_ANY) { 409 int net = inet_netof(in); 410 int lna = inet_lnaof(in); 411 412 if (lna == INADDR_ANY) { 413 np = getnetbyaddr(net, AF_INET); 414 if (np) 415 cp = np->n_name; 416 } 417 if (cp == 0) { 418 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 419 if (hp) 420 cp = hp->h_name; 421 } 422 } 423 if (in.s_addr == INADDR_ANY) 424 strcpy(line, "*"); 425 else if (cp) 426 snprintf(line, sizeof(line), "%s", cp); 427 else { 428 in.s_addr = ntohl(in.s_addr); 429 #define C(x) ((x) & 0xff) 430 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24), 431 C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); 432 } 433 return (line); 434 } 435 436 int 437 cmdnetstat(cmd, args) 438 char *cmd, *args; 439 { 440 register struct netinfo *p; 441 442 if (prefix(cmd, "all")) { 443 aflag = !aflag; 444 goto fixup; 445 } 446 if (prefix(cmd, "numbers") || prefix(cmd, "names")) { 447 int new; 448 449 new = prefix(cmd, "numbers"); 450 if (new == nflag) 451 return (1); 452 p = netcb.ni_forw; 453 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) { 454 if (p->ni_line == -1) 455 continue; 456 p->ni_flags |= NIF_LACHG|NIF_FACHG; 457 } 458 nflag = new; 459 goto redisplay; 460 } 461 if (!netcmd(cmd, args)) 462 return (0); 463 fixup: 464 fetchnetstat(); 465 redisplay: 466 shownetstat(); 467 refresh(); 468 return (1); 469 } 470