Home | History | Annotate | Line # | Download | only in systat
netstat.c revision 1.2 
      1 /*	$NetBSD: netstat.c,v 1.2 1995/01/20 08:52:05 jtc 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 1.2 1995/01/20 08:52:05 jtc 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_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 *prev, *next;
    171 	register struct netinfo *p;
    172 	struct inpcb inpcb;
    173 	struct socket sockb;
    174 	struct tcpcb tcpcb;
    175 	void *off;
    176 	int istcp;
    177 
    178 	if (namelist[X_TCB].n_value == 0)
    179 		return;
    180 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
    181 		p->ni_seen = 0;
    182 	if (protos&TCP) {
    183 		off = NPTR(X_TCB);
    184 		istcp = 1;
    185 	}
    186 	else if (protos&UDP) {
    187 		off = NPTR(X_UDB);
    188 		istcp = 0;
    189 	}
    190 	else {
    191 		error("No protocols to display");
    192 		return;
    193 	}
    194 again:
    195 	KREAD(off, &inpcb, sizeof (struct inpcb));
    196 	prev = off;
    197 	for (; inpcb.inp_next != off; prev = next) {
    198 		next = inpcb.inp_next;
    199 		KREAD(next, &inpcb, sizeof (inpcb));
    200 		if (inpcb.inp_prev != prev) {
    201 			p = netcb.ni_forw;
    202 			for (; p != (struct netinfo *)&netcb; p = p->ni_forw)
    203 				p->ni_seen = 1;
    204 			error("Kernel state in transition");
    205 			return;
    206 		}
    207 		if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
    208 			continue;
    209 		if (nhosts && !checkhost(&inpcb))
    210 			continue;
    211 		if (nports && !checkport(&inpcb))
    212 			continue;
    213 		KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
    214 		if (istcp) {
    215 			KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
    216 			enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
    217 		} else
    218 			enter(&inpcb, &sockb, 0, "udp");
    219 	}
    220 	if (istcp && (protos&UDP)) {
    221 		istcp = 0;
    222 		off = NPTR(X_UDB);
    223 		goto again;
    224 	}
    225 }
    226 
    227 static void
    228 enter(inp, so, state, proto)
    229 	register struct inpcb *inp;
    230 	register struct socket *so;
    231 	int state;
    232 	char *proto;
    233 {
    234 	register struct netinfo *p;
    235 
    236 	/*
    237 	 * Only take exact matches, any sockets with
    238 	 * previously unbound addresses will be deleted
    239 	 * below in the display routine because they
    240 	 * will appear as ``not seen'' in the kernel
    241 	 * data structures.
    242 	 */
    243 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
    244 		if (!streq(proto, p->ni_proto))
    245 			continue;
    246 		if (p->ni_lport != inp->inp_lport ||
    247 		    p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
    248 			continue;
    249 		if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
    250 		    p->ni_fport == inp->inp_fport)
    251 			break;
    252 	}
    253 	if (p == (struct netinfo *)&netcb) {
    254 		if ((p = malloc(sizeof(*p))) == NULL) {
    255 			error("Out of memory");
    256 			return;
    257 		}
    258 		p->ni_prev = (struct netinfo *)&netcb;
    259 		p->ni_forw = netcb.ni_forw;
    260 		netcb.ni_forw->ni_prev = p;
    261 		netcb.ni_forw = p;
    262 		p->ni_line = -1;
    263 		p->ni_laddr = inp->inp_laddr;
    264 		p->ni_lport = inp->inp_lport;
    265 		p->ni_faddr = inp->inp_faddr;
    266 		p->ni_fport = inp->inp_fport;
    267 		p->ni_proto = proto;
    268 		p->ni_flags = NIF_LACHG|NIF_FACHG;
    269 	}
    270 	p->ni_rcvcc = so->so_rcv.sb_cc;
    271 	p->ni_sndcc = so->so_snd.sb_cc;
    272 	p->ni_state = state;
    273 	p->ni_seen = 1;
    274 }
    275 
    276 /* column locations */
    277 #define	LADDR	0
    278 #define	FADDR	LADDR+23
    279 #define	PROTO	FADDR+23
    280 #define	RCVCC	PROTO+6
    281 #define	SNDCC	RCVCC+7
    282 #define	STATE	SNDCC+7
    283 
    284 
    285 void
    286 labelnetstat()
    287 {
    288 	if (namelist[X_TCB].n_type == 0)
    289 		return;
    290 	wmove(wnd, 0, 0); wclrtobot(wnd);
    291 	mvwaddstr(wnd, 0, LADDR, "Local Address");
    292 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
    293 	mvwaddstr(wnd, 0, PROTO, "Proto");
    294 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
    295 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
    296 	mvwaddstr(wnd, 0, STATE, "(state)");
    297 }
    298 
    299 void
    300 shownetstat()
    301 {
    302 	register struct netinfo *p, *q;
    303 
    304 	/*
    305 	 * First, delete any connections that have gone
    306 	 * away and adjust the position of connections
    307 	 * below to reflect the deleted line.
    308 	 */
    309 	p = netcb.ni_forw;
    310 	while (p != (struct netinfo *)&netcb) {
    311 		if (p->ni_line == -1 || p->ni_seen) {
    312 			p = p->ni_forw;
    313 			continue;
    314 		}
    315 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
    316 		q = netcb.ni_forw;
    317 		for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
    318 			if (q != p && q->ni_line > p->ni_line) {
    319 				q->ni_line--;
    320 				/* this shouldn't be necessary */
    321 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
    322 			}
    323 		lastrow--;
    324 		q = p->ni_forw;
    325 		p->ni_prev->ni_forw = p->ni_forw;
    326 		p->ni_forw->ni_prev = p->ni_prev;
    327 		free(p);
    328 		p = q;
    329 	}
    330 	/*
    331 	 * Update existing connections and add new ones.
    332 	 */
    333 	for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
    334 		if (p->ni_line == -1) {
    335 			/*
    336 			 * Add a new entry if possible.
    337 			 */
    338 			if (lastrow > YMAX(wnd))
    339 				continue;
    340 			p->ni_line = lastrow++;
    341 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
    342 		}
    343 		if (p->ni_flags & NIF_LACHG) {
    344 			wmove(wnd, p->ni_line, LADDR);
    345 			inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
    346 			p->ni_flags &= ~NIF_LACHG;
    347 		}
    348 		if (p->ni_flags & NIF_FACHG) {
    349 			wmove(wnd, p->ni_line, FADDR);
    350 			inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
    351 			p->ni_flags &= ~NIF_FACHG;
    352 		}
    353 		mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
    354 		mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
    355 		mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
    356 		if (streq(p->ni_proto, "tcp"))
    357 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
    358 				mvwprintw(wnd, p->ni_line, STATE, "%d",
    359 				    p->ni_state);
    360 			else
    361 				mvwaddstr(wnd, p->ni_line, STATE,
    362 				    tcpstates[p->ni_state]);
    363 		wclrtoeol(wnd);
    364 	}
    365 	if (lastrow < YMAX(wnd)) {
    366 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
    367 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
    368 	}
    369 }
    370 
    371 /*
    372  * Pretty print an Internet address (net address + port).
    373  * If the nflag was specified, use numbers instead of names.
    374  */
    375 static void
    376 inetprint(in, port, proto)
    377 	register struct in_addr *in;
    378 	int port;
    379 	char *proto;
    380 {
    381 	struct servent *sp = 0;
    382 	char line[80], *cp, *index();
    383 
    384 	sprintf(line, "%.*s.", 16, inetname(*in));
    385 	cp = index(line, '\0');
    386 	if (!nflag && port)
    387 		sp = getservbyport(port, proto);
    388 	if (sp || port == 0)
    389 		sprintf(cp, "%.8s", sp ? sp->s_name : "*");
    390 	else
    391 		sprintf(cp, "%d", ntohs((u_short)port));
    392 	/* pad to full column to clear any garbage */
    393 	cp = index(line, '\0');
    394 	while (cp - line < 22)
    395 		*cp++ = ' ';
    396 	*cp = '\0';
    397 	waddstr(wnd, line);
    398 }
    399 
    400 /*
    401  * Construct an Internet address representation.
    402  * If the nflag has been supplied, give
    403  * numeric value, otherwise try for symbolic name.
    404  */
    405 static char *
    406 inetname(in)
    407 	struct in_addr in;
    408 {
    409 	char *cp = 0;
    410 	static char line[50];
    411 	struct hostent *hp;
    412 	struct netent *np;
    413 
    414 	if (!nflag && in.s_addr != INADDR_ANY) {
    415 		int net = inet_netof(in);
    416 		int lna = inet_lnaof(in);
    417 
    418 		if (lna == INADDR_ANY) {
    419 			np = getnetbyaddr(net, AF_INET);
    420 			if (np)
    421 				cp = np->n_name;
    422 		}
    423 		if (cp == 0) {
    424 			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
    425 			if (hp)
    426 				cp = hp->h_name;
    427 		}
    428 	}
    429 	if (in.s_addr == INADDR_ANY)
    430 		strcpy(line, "*");
    431 	else if (cp)
    432 		strcpy(line, cp);
    433 	else {
    434 		in.s_addr = ntohl(in.s_addr);
    435 #define C(x)	((x) & 0xff)
    436 		sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
    437 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
    438 	}
    439 	return (line);
    440 }
    441 
    442 int
    443 cmdnetstat(cmd, args)
    444 	char *cmd, *args;
    445 {
    446 	register struct netinfo *p;
    447 
    448 	if (prefix(cmd, "all")) {
    449 		aflag = !aflag;
    450 		goto fixup;
    451 	}
    452 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
    453 		int new;
    454 
    455 		new = prefix(cmd, "numbers");
    456 		if (new == nflag)
    457 			return (1);
    458 		p = netcb.ni_forw;
    459 		for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
    460 			if (p->ni_line == -1)
    461 				continue;
    462 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
    463 		}
    464 		nflag = new;
    465 		goto redisplay;
    466 	}
    467 	if (!netcmd(cmd, args))
    468 		return (0);
    469 fixup:
    470 	fetchnetstat();
    471 redisplay:
    472 	shownetstat();
    473 	refresh();
    474 	return (1);
    475 }
    476