netcmds.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: stable/11/usr.bin/systat/netcmds.c 331722 2018-03-29 02:50:57Z eadler $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)netcmds.c	8.1 (Berkeley) 6/6/93";
36#endif
37
38/*
39 * Common network command support routines.
40 */
41#include <sys/param.h>
42#include <sys/queue.h>
43#include <sys/socket.h>
44#include <sys/socketvar.h>
45#include <sys/protosw.h>
46
47#include <net/route.h>
48#include <netinet/in.h>
49#include <netinet/in_systm.h>
50#include <netinet/ip.h>
51#include <netinet/in_pcb.h>
52#include <arpa/inet.h>
53
54#include <ctype.h>
55#include <netdb.h>
56#include <stdlib.h>
57#include <string.h>
58
59#include "systat.h"
60#include "extern.h"
61
62#define	streq(a,b)	(strcmp(a,b)==0)
63
64static	struct hitem {
65	struct	in_addr addr;
66	int	onoff;
67} *hosts;
68
69int nports, nhosts, protos;
70
71static void changeitems(const char *, int);
72static int selectproto(const char *);
73static void showprotos(void);
74static int selectport(long, int);
75static void showports(void);
76static int selecthost(struct in_addr *, int);
77static void showhosts(void);
78
79int
80netcmd(const char *cmd, const char *args)
81{
82
83	if (prefix(cmd, "proto")) {
84		if (*args == '\0') {
85			move(CMDLINE, 0);
86			clrtoeol();
87			addstr("which proto?");
88		} else if (!selectproto(args)) {
89			error("%s: Unknown protocol.", args);
90		}
91		return (1);
92	}
93	if (prefix(cmd, "ignore") || prefix(cmd, "display")) {
94		changeitems(args, prefix(cmd, "display"));
95		return (1);
96	}
97	if (prefix(cmd, "reset")) {
98		selectproto(0);
99		selecthost(0, 0);
100		selectport(-1, 0);
101		return (1);
102	}
103	if (prefix(cmd, "show")) {
104		move(CMDLINE, 0); clrtoeol();
105		if (*args == '\0') {
106			showprotos();
107			showhosts();
108			showports();
109			return (1);
110		}
111		if (prefix(args, "protos"))
112			showprotos();
113		else if (prefix(args, "hosts"))
114			showhosts();
115		else if (prefix(args, "ports"))
116			showports();
117		else
118			addstr("show what?");
119		return (1);
120	}
121	return (0);
122}
123
124static void
125changeitems(const char *args, int onoff)
126{
127	char *cp, *tmpstr, *tmpstr1;
128	struct servent *sp;
129	struct hostent *hp;
130	struct in_addr in;
131
132	tmpstr = tmpstr1 = strdup(args);
133	cp = strchr(tmpstr1, '\n');
134	if (cp)
135		*cp = '\0';
136	for (;;tmpstr1 = cp) {
137		for (cp = tmpstr1; *cp && isspace(*cp); cp++)
138			;
139		tmpstr1 = cp;
140		for (; *cp && !isspace(*cp); cp++)
141			;
142		if (*cp)
143			*cp++ = '\0';
144		if (cp - tmpstr1 == 0)
145			break;
146		sp = getservbyname(tmpstr1,
147		    protos == TCP ? "tcp" : protos == UDP ? "udp" : 0);
148		if (sp) {
149			selectport(sp->s_port, onoff);
150			continue;
151		}
152		hp = gethostbyname(tmpstr1);
153		if (hp == NULL) {
154			in.s_addr = inet_addr(tmpstr1);
155			if (in.s_addr == INADDR_NONE) {
156				error("%s: unknown host or port", tmpstr1);
157				continue;
158			}
159		} else
160			in = *(struct in_addr *)hp->h_addr;
161		selecthost(&in, onoff);
162	}
163	free(tmpstr);
164}
165
166static int
167selectproto(const char *proto)
168{
169
170	if (proto == NULL || streq(proto, "all"))
171		protos = TCP | UDP;
172	else if (streq(proto, "tcp"))
173		protos = TCP;
174	else if (streq(proto, "udp"))
175		protos = UDP;
176	else
177		return (0);
178
179	return (protos);
180}
181
182static void
183showprotos(void)
184{
185
186	if ((protos&TCP) == 0)
187		addch('!');
188	addstr("tcp ");
189	if ((protos&UDP) == 0)
190		addch('!');
191	addstr("udp ");
192}
193
194static	struct pitem {
195	long	port;
196	int	onoff;
197} *ports;
198
199static int
200selectport(long port, int onoff)
201{
202	struct pitem *p;
203
204	if (port == -1) {
205		if (ports == NULL)
206			return (0);
207		free((char *)ports), ports = 0;
208		nports = 0;
209		return (1);
210	}
211	for (p = ports; p < ports + nports; p++)
212		if (p->port == port) {
213			p->onoff = onoff;
214			return (0);
215		}
216	if (nports == 0)
217		ports = (struct pitem *)malloc(sizeof (*p));
218	else
219		ports = (struct pitem *)realloc(ports, (nports+1)*sizeof (*p));
220	p = &ports[nports++];
221	p->port = port;
222	p->onoff = onoff;
223	return (1);
224}
225
226int
227checkport(struct inpcb *inp)
228{
229	struct pitem *p;
230
231	if (ports)
232	for (p = ports; p < ports+nports; p++)
233		if (p->port == inp->inp_lport || p->port == inp->inp_fport)
234			return (p->onoff);
235	return (1);
236}
237
238static void
239showports(void)
240{
241	struct pitem *p;
242	struct servent *sp;
243
244	for (p = ports; p < ports+nports; p++) {
245		sp = getservbyport(p->port,
246		    protos == (TCP|UDP) ? 0 : protos == TCP ? "tcp" : "udp");
247		if (!p->onoff)
248			addch('!');
249		if (sp)
250			printw("%s ", sp->s_name);
251		else
252			printw("%d ", p->port);
253	}
254}
255
256static int
257selecthost(struct in_addr *in, int onoff)
258{
259	struct hitem *p;
260
261	if (in == NULL) {
262		if (hosts == NULL)
263			return (0);
264		free((char *)hosts), hosts = 0;
265		nhosts = 0;
266		return (1);
267	}
268	for (p = hosts; p < hosts+nhosts; p++)
269		if (p->addr.s_addr == in->s_addr) {
270			p->onoff = onoff;
271			return (0);
272		}
273	if (nhosts == 0)
274		hosts = (struct hitem *)malloc(sizeof (*p));
275	else
276		hosts = (struct hitem *)realloc(hosts, (nhosts+1)*sizeof (*p));
277	p = &hosts[nhosts++];
278	p->addr = *in;
279	p->onoff = onoff;
280	return (1);
281}
282
283int
284checkhost(struct inpcb *inp)
285{
286	struct hitem *p;
287
288	if (hosts)
289	for (p = hosts; p < hosts+nhosts; p++)
290		if (p->addr.s_addr == inp->inp_laddr.s_addr ||
291		    p->addr.s_addr == inp->inp_faddr.s_addr)
292			return (p->onoff);
293	return (1);
294}
295
296static void
297showhosts(void)
298{
299	struct hitem *p;
300	struct hostent *hp;
301
302	for (p = hosts; p < hosts+nhosts; p++) {
303		hp = gethostbyaddr((char *)&p->addr, sizeof (p->addr), AF_INET);
304		if (!p->onoff)
305			addch('!');
306		printw("%s ", hp ? hp->h_name : (char *)inet_ntoa(p->addr));
307	}
308}
309