Annotation of src/usr.bin/systat/netstat.c, Revision 1.32
1.32 ! canacar 1: /* $OpenBSD: netstat.c,v 1.31 2008/06/12 22:26:01 canacar 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.
1.24 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * netstat
35: */
36: #include <sys/param.h>
37: #include <sys/socket.h>
38: #include <sys/socketvar.h>
39: #include <sys/mbuf.h>
40: #include <sys/protosw.h>
41:
42: #include <netinet/in.h>
43: #include <net/route.h>
44: #include <netinet/in_systm.h>
45: #include <netinet/ip.h>
46: #include <netinet/in_pcb.h>
47: #include <netinet/ip_icmp.h>
48: #include <netinet/icmp_var.h>
49: #include <netinet/ip_var.h>
50: #include <netinet/tcp.h>
51: #include <netinet/tcpip.h>
52: #include <netinet/tcp_seq.h>
53: #define TCPSTATES
54: #include <netinet/tcp_fsm.h>
55: #include <netinet/tcp_timer.h>
56: #include <netinet/tcp_var.h>
57: #include <netinet/tcp_debug.h>
58: #include <netinet/udp.h>
59: #include <netinet/udp_var.h>
1.7 millert 60: #include <arpa/inet.h>
1.1 deraadt 61:
62: #include <netdb.h>
63: #include <stdlib.h>
64: #include <string.h>
1.16 pvalchev 65: #include <err.h>
1.1 deraadt 66: #include <nlist.h>
67: #include <paths.h>
68: #include "systat.h"
1.31 canacar 69: #include "engine.h"
70:
71: struct netinfo {
72: union {
73: struct in_addr nif_laddr; /* local address */
74: struct in6_addr nif_laddr6; /* local address */
75: } l;
76: union {
77: struct in_addr nif_faddr; /* foreign address */
78: struct in6_addr nif_faddr6; /* foreign address */
79: } f;
80: char *nif_proto; /* protocol */
81: long nif_rcvcc; /* rcv buffer character count */
82: long nif_sndcc; /* snd buffer character count */
83: short nif_lport; /* local port */
84: short nif_fport; /* foreign port */
85: short nif_state; /* tcp state */
86: short nif_family;
87: };
88:
89: #define nif_laddr l.nif_laddr
90: #define nif_laddr6 l.nif_laddr6
91: #define nif_faddr f.nif_faddr
92: #define nif_faddr6 f.nif_faddr6
1.1 deraadt 93:
1.21 millert 94: static void enter(struct inpcb *, struct socket *, int, char *);
95: static const char *inetname(struct in_addr);
1.31 canacar 96: static void inetprint(struct in_addr *, int, char *, field_def *);
1.21 millert 97: static const char *inet6name(struct in6_addr *);
1.31 canacar 98: static void inet6print(struct in6_addr *, int, char *, field_def *);
99: static void shownetstat(struct netinfo *p);
100:
101: void print_ns(void);
102: int read_ns(void);
103: int select_ns(void);
104: int ns_keyboard_callback(int);
1.1 deraadt 105:
106: #define streq(a,b) (strcmp(a,b)==0)
107:
1.31 canacar 108: static int aflag = 0;
109:
110: static struct nlist namelist[] = {
111: #define X_TCBTABLE 0 /* no sysctl */
112: { "_tcbtable" },
113: #define X_UDBTABLE 1 /* no sysctl */
114: { "_udbtable" },
115: { "" },
116: };
117: #define ADD_ALLOC 1000
118:
119:
120: int protos;
121:
122: struct netinfo *netinfos = NULL;
123: size_t num_ns = 0;
124: static size_t num_alloc = 0;
125:
126:
127: field_def fields_ns[] = {
128: {"LOCAL ADDRESS", 20, 45, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
129: {"FOREIGN ADDRESS", 20, 45, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
130: {"PROTO", 4, 9, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
131: {"RECV-Q", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
132: {"SEND-Q", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
133: {"STATE", 5, 11, 6, FLD_ALIGN_LEFT, -1, 0, 0, 0},
134: };
135:
136: #define FIELD_ADDR(x) (&fields_ns[x])
137:
138: #define FLD_NS_LOCAL FIELD_ADDR(0)
139: #define FLD_NS_FOREIGN FIELD_ADDR(1)
140: #define FLD_NS_PROTO FIELD_ADDR(2)
141: #define FLD_NS_RECV_Q FIELD_ADDR(3)
142: #define FLD_NS_SEND_Q FIELD_ADDR(4)
143: #define FLD_NS_STATE FIELD_ADDR(5)
144:
145: /* Define views */
146: field_def *view_ns_0[] = {
147: FLD_NS_LOCAL, FLD_NS_FOREIGN, FLD_NS_PROTO,
148: FLD_NS_RECV_Q, FLD_NS_SEND_Q, FLD_NS_STATE, NULL
149: };
150:
151: /* Define view managers */
152: struct view_manager netstat_mgr = {
153: "Netstat", select_ns, read_ns, NULL, print_header,
154: print_ns, ns_keyboard_callback, NULL, NULL
155: };
1.1 deraadt 156:
1.31 canacar 157: field_view views_ns[] = {
158: {view_ns_0, "netstat", '0', &netstat_mgr},
159: {NULL, NULL, 0, NULL}
1.1 deraadt 160: };
161:
162:
163:
1.31 canacar 164:
165: struct netinfo *
166: next_ns(void)
167: {
168: if (num_alloc <= num_ns) {
169: struct netinfo *ni;
170: size_t a = num_alloc + ADD_ALLOC;
171: if (a < num_alloc)
172: return NULL;
173: ni = realloc(netinfos, a * sizeof(*ni));
174: if (ni == NULL)
175: return NULL;
176: netinfos = ni;
177: num_alloc = a;
178: }
179:
180: return &netinfos[num_ns++];
181: }
182:
183: static void
184: enter(struct inpcb *inp, struct socket *so, int state, char *proto)
1.1 deraadt 185: {
1.17 mpech 186: struct netinfo *p;
1.1 deraadt 187:
1.31 canacar 188: p = next_ns();
189: if (p == NULL) {
190: error("Out of Memory!");
191: return;
1.1 deraadt 192: }
1.31 canacar 193:
194: p->nif_lport = inp->inp_lport;
195: p->nif_fport = inp->inp_fport;
196: p->nif_proto = proto;
197:
198: if (inp->inp_flags & INP_IPV6) {
199: p->nif_laddr6 = inp->inp_laddr6;
200: p->nif_faddr6 = inp->inp_faddr6;
201: p->nif_family = AF_INET6;
202: } else {
203: p->nif_laddr = inp->inp_laddr;
204: p->nif_faddr = inp->inp_faddr;
205: p->nif_family = AF_INET;
206: }
207:
208: p->nif_rcvcc = so->so_rcv.sb_cc;
209: p->nif_sndcc = so->so_snd.sb_cc;
210: p->nif_state = state;
1.1 deraadt 211: }
212:
1.31 canacar 213:
214: /* netstat callback functions */
1.1 deraadt 215:
216: int
1.31 canacar 217: select_ns(void)
1.1 deraadt 218: {
1.31 canacar 219: static int init = 0;
220: if (kd == NULL) {
221: num_disp = 1;
222: return (0);
223: }
1.14 ericj 224:
1.31 canacar 225: if (!init) {
226: sethostent(1);
227: setnetent(1);
228: init = 1;
1.1 deraadt 229: }
1.31 canacar 230:
231: num_disp = num_ns;
232: return (0);
1.1 deraadt 233: }
234:
1.31 canacar 235: int
236: read_ns(void)
1.1 deraadt 237: {
238: struct inpcbtable pcbtable;
1.17 mpech 239: struct inpcb *head, *prev, *next;
1.1 deraadt 240: struct inpcb inpcb;
241: struct socket sockb;
242: struct tcpcb tcpcb;
243: void *off;
244: int istcp;
245:
1.31 canacar 246: if (kd == NULL) {
247: return (0);
248: }
249:
250: num_ns = 0;
251:
1.1 deraadt 252: if (namelist[X_TCBTABLE].n_value == 0)
1.31 canacar 253: return 0;
254:
255: if (protos & TCP) {
1.20 deraadt 256: off = NPTR(X_TCBTABLE);
1.1 deraadt 257: istcp = 1;
1.31 canacar 258: } else if (protos & UDP) {
1.20 deraadt 259: off = NPTR(X_UDBTABLE);
1.1 deraadt 260: istcp = 0;
1.20 deraadt 261: } else {
1.1 deraadt 262: error("No protocols to display");
1.31 canacar 263: return 0;
1.1 deraadt 264: }
1.31 canacar 265:
1.1 deraadt 266: again:
267: KREAD(off, &pcbtable, sizeof (struct inpcbtable));
1.31 canacar 268:
1.1 deraadt 269: prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue;
1.28 otto 270: next = CIRCLEQ_FIRST(&pcbtable.inpt_queue);
1.31 canacar 271:
1.1 deraadt 272: while (next != head) {
273: KREAD(next, &inpcb, sizeof (inpcb));
1.28 otto 274: if (CIRCLEQ_PREV(&inpcb, inp_queue) != prev) {
1.1 deraadt 275: error("Kernel state in transition");
1.31 canacar 276: return 0;
1.1 deraadt 277: }
278: prev = next;
1.28 otto 279: next = CIRCLEQ_NEXT(&inpcb, inp_queue);
1.12 itojun 280:
281: if (!aflag) {
1.20 deraadt 282: if (!(inpcb.inp_flags & INP_IPV6) &&
283: inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
1.12 itojun 284: continue;
1.20 deraadt 285: if ((inpcb.inp_flags & INP_IPV6) &&
286: IN6_IS_ADDR_UNSPECIFIED(&inpcb.inp_laddr6))
1.12 itojun 287: continue;
288: }
1.1 deraadt 289: KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
290: if (istcp) {
291: KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
292: enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
293: } else
294: enter(&inpcb, &sockb, 0, "udp");
295: }
1.31 canacar 296: if (istcp && (protos & UDP)) {
1.1 deraadt 297: istcp = 0;
298: off = NPTR(X_UDBTABLE);
299: goto again;
300: }
1.31 canacar 301:
302: num_disp = num_ns;
303: return 0;
1.1 deraadt 304: }
305:
1.31 canacar 306: void
307: print_ns(void)
1.1 deraadt 308: {
1.31 canacar 309: int n, count = 0;
1.1 deraadt 310:
1.31 canacar 311: if (kd == NULL) {
312: print_fld_str(FLD_NS_LOCAL, "Failed to initialize KVM!");
313: print_fld_str(FLD_NS_FOREIGN, "Failed to initialize KVM!");
314: end_line();
315: return;
1.1 deraadt 316: }
1.31 canacar 317:
318: for (n = dispstart; n < num_disp; n++) {
319: shownetstat(netinfos + n);
320: count++;
321: if (maxprint > 0 && count >= maxprint)
322: break;
1.11 angelos 323: }
1.1 deraadt 324: }
325:
326:
1.31 canacar 327: int
328: initnetstat(void)
329: {
330: field_view *v;
331: int ret;
1.1 deraadt 332:
1.31 canacar 333: if (kd) {
334: if ((ret = kvm_nlist(kd, namelist)) == -1)
335: errx(1, "%s", kvm_geterr(kd));
336: else if (ret)
337: nlisterr(namelist);
338:
339: if (namelist[X_TCBTABLE].n_value == 0) {
340: error("No symbols in namelist");
341: return(0);
342: }
343: }
344: protos = TCP|UDP;
345:
346: for (v = views_ns; v->name != NULL; v++)
347: add_view(v);
348:
349: return(1);
1.1 deraadt 350: }
351:
1.31 canacar 352: static void
353: shownetstat(struct netinfo *p)
1.1 deraadt 354: {
1.31 canacar 355: switch (p->nif_family) {
356: case AF_INET:
357: inetprint(&p->nif_laddr, p->nif_lport,
358: p->nif_proto, FLD_NS_LOCAL);
359: inetprint(&p->nif_faddr, p->nif_fport,
360: p->nif_proto, FLD_NS_FOREIGN);
361: break;
362: case AF_INET6:
363: inet6print(&p->nif_laddr6, p->nif_lport,
364: p->nif_proto, FLD_NS_LOCAL);
365: inet6print(&p->nif_faddr6, p->nif_fport,
366: p->nif_proto, FLD_NS_FOREIGN);
367: break;
368: }
369:
370: tb_start();
371: tbprintf("%s", p->nif_proto);
372: if (p->nif_family == AF_INET6)
373: tbprintf("6");
374:
375: print_fld_tb(FLD_NS_PROTO);
376:
377: print_fld_size(FLD_NS_RECV_Q, p->nif_rcvcc);
378: print_fld_size(FLD_NS_SEND_Q, p->nif_sndcc);
379:
380: if (streq(p->nif_proto, "tcp")) {
381: if (p->nif_state < 0 || p->nif_state >= TCP_NSTATES)
382: print_fld_uint(FLD_NS_STATE, p->nif_state);
383: else
384: print_fld_str(FLD_NS_STATE, tcpstates[p->nif_state]);
1.1 deraadt 385: }
1.31 canacar 386: end_line();
1.1 deraadt 387: }
388:
389: /*
390: * Pretty print an Internet address (net address + port).
391: * If the nflag was specified, use numbers instead of names.
392: */
393: static void
1.31 canacar 394: inetprint(struct in_addr *in, int port, char *proto, field_def *fld)
1.1 deraadt 395: {
396: struct servent *sp = 0;
397:
1.31 canacar 398: tb_start();
399: tbprintf("%s", inetname(*in));
400:
1.1 deraadt 401: if (!nflag && port)
402: sp = getservbyport(port, proto);
403: if (sp || port == 0)
1.31 canacar 404: tbprintf(":%s", sp ? sp->s_name : "*");
1.1 deraadt 405: else
1.31 canacar 406: tbprintf(":%d", ntohs((u_short)port));
407:
408: print_fld_tb(fld);
1.1 deraadt 409: }
410:
1.12 itojun 411: static void
1.31 canacar 412: inet6print(struct in6_addr *in6, int port, char *proto, field_def *fld)
1.12 itojun 413: {
414: struct servent *sp = 0;
415:
1.31 canacar 416: tb_start();
417:
418: tbprintf("%s", inet6name(in6));
1.12 itojun 419: if (!nflag && port)
420: sp = getservbyport(port, proto);
421: if (sp || port == 0)
1.31 canacar 422: tbprintf(":%s", sp ? sp->s_name : "*");
1.12 itojun 423: else
1.31 canacar 424: tbprintf(":%d", ntohs((u_short)port));
1.12 itojun 425:
1.31 canacar 426: print_fld_tb(fld);
1.1 deraadt 427: }
1.12 itojun 428:
429: static const char *
1.22 deraadt 430: inet6name(struct in6_addr *in6)
1.12 itojun 431: {
432: static char line[NI_MAXHOST];
433: struct sockaddr_in6 sin6;
434: int flags;
435:
1.25 itojun 436: flags = nflag ? NI_NUMERICHOST : 0;
1.12 itojun 437: if (IN6_IS_ADDR_UNSPECIFIED(in6))
438: return "*";
439: memset(&sin6, 0, sizeof(sin6));
440: sin6.sin6_family = AF_INET6;
441: sin6.sin6_len = sizeof(struct sockaddr_in6);
442: sin6.sin6_addr = *in6;
443: if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
1.20 deraadt 444: line, sizeof(line), NULL, 0, flags) == 0)
1.12 itojun 445: return line;
446: return "?";
447: }
1.1 deraadt 448:
1.31 canacar 449: static const char *
450: inetname(struct in_addr in)
451: {
452: static char line[NI_MAXHOST];
1.32 ! canacar 453: struct sockaddr_in si;
1.31 canacar 454: int flags, e;
455:
456: flags = nflag ? NI_NUMERICHOST : 0;
457: if (in.s_addr == INADDR_ANY)
458: return "*";
459:
1.32 ! canacar 460: memset(&si, 0, sizeof(si));
! 461: si.sin_family = AF_INET;
! 462: si.sin_len = sizeof(struct sockaddr_in);
! 463: si.sin_addr = in;
1.31 canacar 464:
1.32 ! canacar 465: e = getnameinfo((struct sockaddr *)&si, si.sin_len,
1.31 canacar 466: line, sizeof(line), NULL, 0, flags);
467:
468: if (e == 0)
469: return line;
470:
471: error("Lookup: %s", gai_strerror(e));
472:
473: return "?";
474: }
475:
476: int
477: kvm_ckread(void *a, void *b, size_t l)
478: {
479: if (kvm_read(kd, (u_long)a, b, l) != l) {
480: if (verbose)
481: error("error reading kmem at %x\n", a);
482: return (0);
483: } else
484: return (1);
485: }
486:
487:
1.1 deraadt 488: int
1.31 canacar 489: ns_keyboard_callback(int ch)
1.1 deraadt 490: {
1.31 canacar 491: switch (ch) {
492: case 'n':
493: nflag = !nflag;
494: gotsig_alarm = 1;
495: break;
496: case 't':
497: protos ^= TCP;
498: gotsig_alarm = 1;
499: break;
500: case 'u':
501: protos ^= UDP;
502: gotsig_alarm = 1;
503: break;
504: default:
505: return keyboard_callback(ch);
506: };
1.1 deraadt 507:
1.31 canacar 508: return 1;
1.1 deraadt 509: }
1.31 canacar 510:
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