Annotation of src/usr.bin/systat/netstat.c, Revision 1.13
1.13 ! itojun 1: /* $OpenBSD: netstat.c,v 1.12 2000/01/05 11:04:22 itojun Exp $ */
1.1 deraadt 2: /* $NetBSD: netstat.c,v 1.3 1995/06/18 23:53:07 cgd Exp $ */
3:
4: /*-
5: * Copyright (c) 1980, 1992, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93";
40: #endif
1.13 ! itojun 41: static char rcsid[] = "$OpenBSD: netstat.c,v 1.12 2000/01/05 11:04:22 itojun Exp $";
1.1 deraadt 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: #include <net/route.h>
55: #include <netinet/in_systm.h>
56: #include <netinet/ip.h>
57: #include <netinet/in_pcb.h>
58: #include <netinet/ip_icmp.h>
59: #include <netinet/icmp_var.h>
60: #include <netinet/ip_var.h>
61: #include <netinet/tcp.h>
62: #include <netinet/tcpip.h>
63: #include <netinet/tcp_seq.h>
64: #define TCPSTATES
65: #include <netinet/tcp_fsm.h>
66: #include <netinet/tcp_timer.h>
67: #include <netinet/tcp_var.h>
68: #include <netinet/tcp_debug.h>
69: #include <netinet/udp.h>
70: #include <netinet/udp_var.h>
1.7 millert 71: #include <arpa/inet.h>
1.1 deraadt 72:
73: #include <netdb.h>
74: #include <stdlib.h>
75: #include <string.h>
76: #include <nlist.h>
77: #include <paths.h>
78: #include "systat.h"
79: #include "extern.h"
80:
81: static void enter __P((struct inpcb *, struct socket *, int, char *));
1.12 itojun 82: static const char *inetname __P((struct in_addr));
1.1 deraadt 83: static void inetprint __P((struct in_addr *, int, char *));
1.12 itojun 84: #ifdef INET6
85: static const char *inet6name __P((struct in6_addr *));
86: static void inet6print __P((struct in6_addr *, int, char *));
87: #endif
1.1 deraadt 88:
89: #define streq(a,b) (strcmp(a,b)==0)
1.2 mickey 90: #define YMAX(w) ((w)->_maxy-1)
1.1 deraadt 91:
92: WINDOW *
93: opennetstat()
94: {
95: sethostent(1);
96: setnetent(1);
97: return (subwin(stdscr, LINES-5-1, 0, 5, 0));
98: }
99:
100: struct netinfo {
1.11 angelos 101: struct netinfo *nif_forw, *nif_prev;
1.12 itojun 102: int nif_family;
1.11 angelos 103: short nif_line; /* line on screen */
104: short nif_seen; /* 0 when not present in list */
105: short nif_flags;
1.1 deraadt 106: #define NIF_LACHG 0x1 /* local address changed */
107: #define NIF_FACHG 0x2 /* foreign address changed */
1.11 angelos 108: short nif_state; /* tcp state */
109: char *nif_proto; /* protocol */
110: struct in_addr nif_laddr; /* local address */
1.12 itojun 111: #ifdef INET6
112: struct in6_addr nif_laddr6; /* local address */
113: #endif
1.11 angelos 114: long nif_lport; /* local port */
115: struct in_addr nif_faddr; /* foreign address */
1.12 itojun 116: #ifdef INET6
117: struct in6_addr nif_faddr6; /* foreign address */
118: #endif
1.11 angelos 119: long nif_fport; /* foreign port */
120: long nif_rcvcc; /* rcv buffer character count */
121: long nif_sndcc; /* snd buffer character count */
1.1 deraadt 122: };
123:
124: static struct {
1.11 angelos 125: struct netinfo *nif_forw, *nif_prev;
1.1 deraadt 126: } netcb;
127:
128: static int aflag = 0;
129: static int nflag = 0;
130: static int lastrow = 1;
131:
132: void
133: closenetstat(w)
134: WINDOW *w;
135: {
136: register struct netinfo *p;
137:
138: endhostent();
139: endnetent();
1.11 angelos 140: p = (struct netinfo *)netcb.nif_forw;
1.1 deraadt 141: while (p != (struct netinfo *)&netcb) {
1.11 angelos 142: if (p->nif_line != -1)
1.1 deraadt 143: lastrow--;
1.11 angelos 144: p->nif_line = -1;
145: p = p->nif_forw;
1.1 deraadt 146: }
147: if (w != NULL) {
148: wclear(w);
149: wrefresh(w);
150: delwin(w);
151: }
152: }
153:
154: static struct nlist namelist[] = {
155: #define X_TCBTABLE 0
156: { "_tcbtable" },
157: #define X_UDBTABLE 1
158: { "_udbtable" },
159: { "" },
160: };
161:
162: int
163: initnetstat()
164: {
165: if (kvm_nlist(kd, namelist)) {
166: nlisterr(namelist);
167: return(0);
168: }
169: if (namelist[X_TCBTABLE].n_value == 0) {
170: error("No symbols in namelist");
171: return(0);
172: }
1.11 angelos 173: netcb.nif_forw = netcb.nif_prev = (struct netinfo *)&netcb;
1.1 deraadt 174: protos = TCP|UDP;
175: return(1);
176: }
177:
178: void
179: fetchnetstat()
180: {
181: struct inpcbtable pcbtable;
182: register struct inpcb *head, *prev, *next;
183: register struct netinfo *p;
184: struct inpcb inpcb;
185: struct socket sockb;
186: struct tcpcb tcpcb;
187: void *off;
188: int istcp;
189:
190: if (namelist[X_TCBTABLE].n_value == 0)
191: return;
1.11 angelos 192: for (p = netcb.nif_forw; p != (struct netinfo *)&netcb; p = p->nif_forw)
193: p->nif_seen = 0;
1.1 deraadt 194: if (protos&TCP) {
195: off = NPTR(X_TCBTABLE);
196: istcp = 1;
197: }
198: else if (protos&UDP) {
199: off = NPTR(X_UDBTABLE);
200: istcp = 0;
201: }
202: else {
203: error("No protocols to display");
204: return;
205: }
206: again:
207: KREAD(off, &pcbtable, sizeof (struct inpcbtable));
208: prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue;
209: next = pcbtable.inpt_queue.cqh_first;
210: while (next != head) {
211: KREAD(next, &inpcb, sizeof (inpcb));
212: if (inpcb.inp_queue.cqe_prev != prev) {
213: printf("prev = %x, head = %x, next = %x, inpcb...prev = %x\n", prev, head, next, inpcb.inp_queue.cqe_prev);
1.11 angelos 214: p = netcb.nif_forw;
215: for (; p != (struct netinfo *)&netcb; p = p->nif_forw)
216: p->nif_seen = 1;
1.1 deraadt 217: error("Kernel state in transition");
218: return;
219: }
220: prev = next;
221: next = inpcb.inp_queue.cqe_next;
222:
1.12 itojun 223: #ifndef INET6
224: if (inpcb.inp_flags & INP_IPV6)
1.1 deraadt 225: continue;
1.12 itojun 226: #endif
227:
228: if (!aflag) {
229: if (!(inpcb.inp_flags & INP_IPV6)
230: && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
231: continue;
232: #ifdef INET6
233: if ((inpcb.inp_flags & INP_IPV6)
234: && IN6_IS_ADDR_UNSPECIFIED(&inpcb.inp_laddr6))
235: continue;
236: #endif
237: }
1.1 deraadt 238: if (nhosts && !checkhost(&inpcb))
239: continue;
240: if (nports && !checkport(&inpcb))
241: continue;
242: KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
243: if (istcp) {
244: KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
245: enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
246: } else
247: enter(&inpcb, &sockb, 0, "udp");
248: }
249: if (istcp && (protos&UDP)) {
250: istcp = 0;
251: off = NPTR(X_UDBTABLE);
252: goto again;
253: }
254: }
255:
256: static void
257: enter(inp, so, state, proto)
258: register struct inpcb *inp;
259: register struct socket *so;
260: int state;
261: char *proto;
262: {
263: register struct netinfo *p;
264:
265: /*
266: * Only take exact matches, any sockets with
267: * previously unbound addresses will be deleted
268: * below in the display routine because they
269: * will appear as ``not seen'' in the kernel
270: * data structures.
271: */
1.12 itojun 272: for (p = netcb.nif_forw; p != (struct netinfo *)&netcb; p = p->nif_forw) {
273: #ifdef INET6
274: if (p->nif_family == AF_INET && (inp->inp_flags & INP_IPV6))
275: continue;
276: if (p->nif_family == AF_INET6 && !(inp->inp_flags & INP_IPV6))
277: continue;
278: #endif
1.11 angelos 279: if (!streq(proto, p->nif_proto))
1.1 deraadt 280: continue;
1.12 itojun 281: if (p->nif_family == AF_INET) {
282: if (p->nif_lport != inp->inp_lport ||
283: p->nif_laddr.s_addr != inp->inp_laddr.s_addr)
284: continue;
285: if (p->nif_faddr.s_addr == inp->inp_faddr.s_addr &&
286: p->nif_fport == inp->inp_fport)
287: break;
288:
289: }
290: #ifdef INET6
291: else if (p->nif_family == AF_INET6) {
292: if (p->nif_lport != inp->inp_lport ||
293: !IN6_ARE_ADDR_EQUAL(&p->nif_laddr6, &inp->inp_laddr6))
294: continue;
1.13 ! itojun 295: if (IN6_ARE_ADDR_EQUAL(&p->nif_faddr6, &inp->inp_faddr6) &&
1.12 itojun 296: p->nif_fport == inp->inp_fport)
297: break;
298: }
299: #endif
300: else
1.1 deraadt 301: continue;
302: }
303: if (p == (struct netinfo *)&netcb) {
304: if ((p = malloc(sizeof(*p))) == NULL) {
305: error("Out of memory");
306: return;
307: }
1.11 angelos 308: p->nif_prev = (struct netinfo *)&netcb;
309: p->nif_forw = netcb.nif_forw;
310: netcb.nif_forw->nif_prev = p;
311: netcb.nif_forw = p;
312: p->nif_line = -1;
313: p->nif_lport = inp->inp_lport;
314: p->nif_fport = inp->inp_fport;
315: p->nif_proto = proto;
316: p->nif_flags = NIF_LACHG|NIF_FACHG;
1.12 itojun 317: #ifdef INET6
318: if (inp->inp_flags & INP_IPV6) {
319: p->nif_laddr6 = inp->inp_laddr6;
320: p->nif_faddr6 = inp->inp_faddr6;
321: p->nif_family = AF_INET6;
322: }
323: else
324: #endif
325: {
326: p->nif_laddr = inp->inp_laddr;
327: p->nif_faddr = inp->inp_faddr;
328: p->nif_family = AF_INET;
329: }
1.11 angelos 330: }
331: p->nif_rcvcc = so->so_rcv.sb_cc;
332: p->nif_sndcc = so->so_snd.sb_cc;
333: p->nif_state = state;
334: p->nif_seen = 1;
1.1 deraadt 335: }
336:
337: /* column locations */
338: #define LADDR 0
339: #define FADDR LADDR+23
340: #define PROTO FADDR+23
341: #define RCVCC PROTO+6
342: #define SNDCC RCVCC+7
343: #define STATE SNDCC+7
344:
345:
346: void
347: labelnetstat()
348: {
349: if (namelist[X_TCBTABLE].n_type == 0)
350: return;
351: wmove(wnd, 0, 0); wclrtobot(wnd);
352: mvwaddstr(wnd, 0, LADDR, "Local Address");
353: mvwaddstr(wnd, 0, FADDR, "Foreign Address");
354: mvwaddstr(wnd, 0, PROTO, "Proto");
355: mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
356: mvwaddstr(wnd, 0, SNDCC, "Send-Q");
357: mvwaddstr(wnd, 0, STATE, "(state)");
358: }
359:
360: void
361: shownetstat()
362: {
363: register struct netinfo *p, *q;
364:
365: /*
366: * First, delete any connections that have gone
367: * away and adjust the position of connections
368: * below to reflect the deleted line.
369: */
1.11 angelos 370: p = netcb.nif_forw;
1.1 deraadt 371: while (p != (struct netinfo *)&netcb) {
1.11 angelos 372: if (p->nif_line == -1 || p->nif_seen) {
373: p = p->nif_forw;
1.1 deraadt 374: continue;
375: }
1.11 angelos 376: wmove(wnd, p->nif_line, 0); wdeleteln(wnd);
377: q = netcb.nif_forw;
378: for (; q != (struct netinfo *)&netcb; q = q->nif_forw)
379: if (q != p && q->nif_line > p->nif_line) {
380: q->nif_line--;
1.1 deraadt 381: /* this shouldn't be necessary */
1.11 angelos 382: q->nif_flags |= NIF_LACHG|NIF_FACHG;
1.1 deraadt 383: }
384: lastrow--;
1.11 angelos 385: q = p->nif_forw;
386: p->nif_prev->nif_forw = p->nif_forw;
387: p->nif_forw->nif_prev = p->nif_prev;
1.1 deraadt 388: free(p);
389: p = q;
390: }
391: /*
392: * Update existing connections and add new ones.
393: */
1.12 itojun 394: for (p = netcb.nif_forw; p != (struct netinfo *)&netcb; p = p->nif_forw) {
1.11 angelos 395: if (p->nif_line == -1) {
1.1 deraadt 396: /*
397: * Add a new entry if possible.
398: */
399: if (lastrow > YMAX(wnd))
400: continue;
1.11 angelos 401: p->nif_line = lastrow++;
402: p->nif_flags |= NIF_LACHG|NIF_FACHG;
1.1 deraadt 403: }
1.11 angelos 404: if (p->nif_flags & NIF_LACHG) {
405: wmove(wnd, p->nif_line, LADDR);
1.12 itojun 406: switch (p->nif_family) {
407: case AF_INET:
408: inetprint(&p->nif_laddr, p->nif_lport,
409: p->nif_proto);
410: break;
411: #ifdef INET6
412: case AF_INET6:
413: inet6print(&p->nif_laddr6, p->nif_lport,
414: p->nif_proto);
415: break;
416: #endif
417: }
1.11 angelos 418: p->nif_flags &= ~NIF_LACHG;
1.1 deraadt 419: }
1.11 angelos 420: if (p->nif_flags & NIF_FACHG) {
421: wmove(wnd, p->nif_line, FADDR);
1.12 itojun 422: switch (p->nif_family) {
423: case AF_INET:
424: inetprint(&p->nif_faddr, p->nif_fport,
425: p->nif_proto);
426: break;
427: #ifdef INET6
428: case AF_INET6:
429: inet6print(&p->nif_faddr6, p->nif_fport,
430: p->nif_proto);
431: break;
432: #endif
433: }
1.11 angelos 434: p->nif_flags &= ~NIF_FACHG;
1.1 deraadt 435: }
1.11 angelos 436: mvwaddstr(wnd, p->nif_line, PROTO, p->nif_proto);
1.12 itojun 437: #ifdef INET6
438: if (p->nif_family == AF_INET6)
439: waddstr(wnd, "6");
440: #endif
1.11 angelos 441: mvwprintw(wnd, p->nif_line, RCVCC, "%6d", p->nif_rcvcc);
442: mvwprintw(wnd, p->nif_line, SNDCC, "%6d", p->nif_sndcc);
443: if (streq(p->nif_proto, "tcp"))
444: if (p->nif_state < 0 || p->nif_state >= TCP_NSTATES)
445: mvwprintw(wnd, p->nif_line, STATE, "%d",
446: p->nif_state);
1.1 deraadt 447: else
1.11 angelos 448: mvwaddstr(wnd, p->nif_line, STATE,
449: tcpstates[p->nif_state]);
1.1 deraadt 450: wclrtoeol(wnd);
451: }
452: if (lastrow < YMAX(wnd)) {
453: wmove(wnd, lastrow, 0); wclrtobot(wnd);
454: wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */
455: }
456: }
457:
458: /*
459: * Pretty print an Internet address (net address + port).
460: * If the nflag was specified, use numbers instead of names.
461: */
462: static void
463: inetprint(in, port, proto)
464: register struct in_addr *in;
465: int port;
466: char *proto;
467: {
468: struct servent *sp = 0;
1.6 millert 469: char line[80], *cp;
1.1 deraadt 470:
1.8 deraadt 471: snprintf(line, sizeof line, "%.*s.", 16, inetname(*in));
1.6 millert 472: cp = strchr(line, '\0');
1.1 deraadt 473: if (!nflag && port)
474: sp = getservbyport(port, proto);
475: if (sp || port == 0)
1.8 deraadt 476: snprintf(cp, sizeof line - strlen(cp), "%.8s",
477: sp ? sp->s_name : "*");
1.1 deraadt 478: else
1.8 deraadt 479: snprintf(cp, sizeof line - strlen(cp), "%d",
480: ntohs((u_short)port));
1.1 deraadt 481: /* pad to full column to clear any garbage */
1.6 millert 482: cp = strchr(line, '\0');
1.10 deraadt 483: while (cp - line < 22 && cp - line < sizeof line-1)
1.1 deraadt 484: *cp++ = ' ';
485: *cp = '\0';
486: waddstr(wnd, line);
487: }
488:
1.12 itojun 489: #ifdef INET6
490: static void
491: inet6print(in6, port, proto)
492: register struct in6_addr *in6;
493: int port;
494: char *proto;
495: {
496: struct servent *sp = 0;
497: char line[80], *cp;
498:
499: snprintf(line, sizeof line, "%.*s.", 16, inet6name(in6));
500: cp = strchr(line, '\0');
501: if (!nflag && port)
502: sp = getservbyport(port, proto);
503: if (sp || port == 0)
504: snprintf(cp, sizeof line - strlen(cp), "%.8s",
505: sp ? sp->s_name : "*");
506: else
507: snprintf(cp, sizeof line - strlen(cp), "%d",
508: ntohs((u_short)port));
509: /* pad to full column to clear any garbage */
510: cp = strchr(line, '\0');
511: while (cp - line < 22 && cp - line < sizeof line-1)
512: *cp++ = ' ';
513: *cp = '\0';
514: waddstr(wnd, line);
515: }
516: #endif
517:
1.1 deraadt 518: /*
519: * Construct an Internet address representation.
520: * If the nflag has been supplied, give
521: * numeric value, otherwise try for symbolic name.
522: */
1.12 itojun 523: static const char *
1.1 deraadt 524: inetname(in)
525: struct in_addr in;
526: {
527: char *cp = 0;
528: static char line[50];
529: struct hostent *hp;
530: struct netent *np;
531:
532: if (!nflag && in.s_addr != INADDR_ANY) {
533: int net = inet_netof(in);
534: int lna = inet_lnaof(in);
535:
536: if (lna == INADDR_ANY) {
537: np = getnetbyaddr(net, AF_INET);
538: if (np)
539: cp = np->n_name;
540: }
541: if (cp == 0) {
542: hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
543: if (hp)
544: cp = hp->h_name;
545: }
546: }
1.9 deraadt 547: if (in.s_addr == INADDR_ANY) {
548: strncpy(line, "*", sizeof line-1);
549: line[sizeof line-1] = '\0';
550: } else if (cp) {
551: strncpy(line, cp, sizeof line-1);
552: line[sizeof line-1] = '\0';
553: } else {
1.1 deraadt 554: in.s_addr = ntohl(in.s_addr);
555: #define C(x) ((x) & 0xff)
1.8 deraadt 556: snprintf(line, sizeof line, "%u.%u.%u.%u", C(in.s_addr >> 24),
1.1 deraadt 557: C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
558: }
559: return (line);
560: }
1.12 itojun 561:
562: #ifdef INET6
563: static const char *
564: inet6name(in6)
565: struct in6_addr *in6;
566: {
567: static char line[NI_MAXHOST];
568: struct sockaddr_in6 sin6;
569: int flags;
570:
571: if (nflag)
572: flags = NI_NUMERICHOST;
573: else
574: flags = 0;
575: if (IN6_IS_ADDR_UNSPECIFIED(in6))
576: return "*";
577: memset(&sin6, 0, sizeof(sin6));
578: sin6.sin6_family = AF_INET6;
579: sin6.sin6_len = sizeof(struct sockaddr_in6);
580: sin6.sin6_addr = *in6;
581: if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
582: line, sizeof(line), NULL, 0, flags) == 0)
583: return line;
584: return "?";
585: }
586: #endif
1.1 deraadt 587:
588: int
589: cmdnetstat(cmd, args)
590: char *cmd, *args;
591: {
592: register struct netinfo *p;
593:
594: if (prefix(cmd, "all")) {
595: aflag = !aflag;
596: goto fixup;
597: }
598: if (prefix(cmd, "numbers") || prefix(cmd, "names")) {
599: int new;
600:
601: new = prefix(cmd, "numbers");
602: if (new == nflag)
603: return (1);
1.11 angelos 604: p = netcb.nif_forw;
605: for (; p != (struct netinfo *)&netcb; p = p->nif_forw) {
606: if (p->nif_line == -1)
1.1 deraadt 607: continue;
1.11 angelos 608: p->nif_flags |= NIF_LACHG|NIF_FACHG;
1.1 deraadt 609: }
610: nflag = new;
1.4 deraadt 611: wclear(wnd);
612: labelnetstat();
1.1 deraadt 613: goto redisplay;
614: }
615: if (!netcmd(cmd, args))
616: return (0);
617: fixup:
618: fetchnetstat();
619: redisplay:
620: shownetstat();
621: refresh();
622: return (1);
623: }
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