4.4BSD/usr/src/usr.bin/systat/netstat.c
/*-
* Copyright (c) 1980, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* netstat
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <netinet/in.h>
#include <net/route.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_seq.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_debug.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <nlist.h>
#include <paths.h>
#include "systat.h"
#include "extern.h"
static void enter __P((struct inpcb *, struct socket *, int, char *));
static char *inetname __P((struct in_addr));
static void inetprint __P((struct in_addr *, int, char *));
#define streq(a,b) (strcmp(a,b)==0)
#define YMAX(w) ((w)->maxy-1)
WINDOW *
opennetstat()
{
sethostent(1);
setnetent(1);
return (subwin(stdscr, LINES-5-1, 0, 5, 0));
}
struct netinfo {
struct netinfo *ni_forw, *ni_prev;
short ni_line; /* line on screen */
short ni_seen; /* 0 when not present in list */
short ni_flags;
#define NIF_LACHG 0x1 /* local address changed */
#define NIF_FACHG 0x2 /* foreign address changed */
short ni_state; /* tcp state */
char *ni_proto; /* protocol */
struct in_addr ni_laddr; /* local address */
long ni_lport; /* local port */
struct in_addr ni_faddr; /* foreign address */
long ni_fport; /* foreign port */
long ni_rcvcc; /* rcv buffer character count */
long ni_sndcc; /* snd buffer character count */
};
static struct {
struct netinfo *ni_forw, *ni_prev;
} netcb;
static int aflag = 0;
static int nflag = 0;
static int lastrow = 1;
static void enter(), inetprint();
static char *inetname();
void
closenetstat(w)
WINDOW *w;
{
register struct netinfo *p;
endhostent();
endnetent();
p = (struct netinfo *)netcb.ni_forw;
while (p != (struct netinfo *)&netcb) {
if (p->ni_line != -1)
lastrow--;
p->ni_line = -1;
p = p->ni_forw;
}
if (w != NULL) {
wclear(w);
wrefresh(w);
delwin(w);
}
}
static struct nlist namelist[] = {
#define X_TCB 0
{ "_tcb" },
#define X_UDB 1
{ "_udb" },
{ "" },
};
int
initnetstat()
{
if (kvm_nlist(kd, namelist)) {
nlisterr(namelist);
return(0);
}
if (namelist[X_TCB].n_value == 0) {
error("No symbols in namelist");
return(0);
}
netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
protos = TCP|UDP;
return(1);
}
void
fetchnetstat()
{
register struct inpcb *prev, *next;
register struct netinfo *p;
struct inpcb inpcb;
struct socket sockb;
struct tcpcb tcpcb;
void *off;
int istcp;
if (namelist[X_TCB].n_value == 0)
return;
for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
p->ni_seen = 0;
if (protos&TCP) {
off = NPTR(X_TCB);
istcp = 1;
}
else if (protos&UDP) {
off = NPTR(X_UDB);
istcp = 0;
}
else {
error("No protocols to display");
return;
}
again:
KREAD(off, &inpcb, sizeof (struct inpcb));
prev = off;
for (; inpcb.inp_next != off; prev = next) {
next = inpcb.inp_next;
KREAD(next, &inpcb, sizeof (inpcb));
if (inpcb.inp_prev != prev) {
p = netcb.ni_forw;
for (; p != (struct netinfo *)&netcb; p = p->ni_forw)
p->ni_seen = 1;
error("Kernel state in transition");
return;
}
if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
continue;
if (nhosts && !checkhost(&inpcb))
continue;
if (nports && !checkport(&inpcb))
continue;
KREAD(inpcb.inp_socket, &sockb, sizeof (sockb));
if (istcp) {
KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
enter(&inpcb, &sockb, tcpcb.t_state, "tcp");
} else
enter(&inpcb, &sockb, 0, "udp");
}
if (istcp && (protos&UDP)) {
istcp = 0;
off = NPTR(X_UDB);
goto again;
}
}
static void
enter(inp, so, state, proto)
register struct inpcb *inp;
register struct socket *so;
int state;
char *proto;
{
register struct netinfo *p;
/*
* Only take exact matches, any sockets with
* previously unbound addresses will be deleted
* below in the display routine because they
* will appear as ``not seen'' in the kernel
* data structures.
*/
for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
if (!streq(proto, p->ni_proto))
continue;
if (p->ni_lport != inp->inp_lport ||
p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
continue;
if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
p->ni_fport == inp->inp_fport)
break;
}
if (p == (struct netinfo *)&netcb) {
if ((p = malloc(sizeof(*p))) == NULL) {
error("Out of memory");
return;
}
p->ni_prev = (struct netinfo *)&netcb;
p->ni_forw = netcb.ni_forw;
netcb.ni_forw->ni_prev = p;
netcb.ni_forw = p;
p->ni_line = -1;
p->ni_laddr = inp->inp_laddr;
p->ni_lport = inp->inp_lport;
p->ni_faddr = inp->inp_faddr;
p->ni_fport = inp->inp_fport;
p->ni_proto = proto;
p->ni_flags = NIF_LACHG|NIF_FACHG;
}
p->ni_rcvcc = so->so_rcv.sb_cc;
p->ni_sndcc = so->so_snd.sb_cc;
p->ni_state = state;
p->ni_seen = 1;
}
/* column locations */
#define LADDR 0
#define FADDR LADDR+23
#define PROTO FADDR+23
#define RCVCC PROTO+6
#define SNDCC RCVCC+7
#define STATE SNDCC+7
void
labelnetstat()
{
if (namelist[X_TCB].n_type == 0)
return;
wmove(wnd, 0, 0); wclrtobot(wnd);
mvwaddstr(wnd, 0, LADDR, "Local Address");
mvwaddstr(wnd, 0, FADDR, "Foreign Address");
mvwaddstr(wnd, 0, PROTO, "Proto");
mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
mvwaddstr(wnd, 0, SNDCC, "Send-Q");
mvwaddstr(wnd, 0, STATE, "(state)");
}
void
shownetstat()
{
register struct netinfo *p, *q;
/*
* First, delete any connections that have gone
* away and adjust the position of connections
* below to reflect the deleted line.
*/
p = netcb.ni_forw;
while (p != (struct netinfo *)&netcb) {
if (p->ni_line == -1 || p->ni_seen) {
p = p->ni_forw;
continue;
}
wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
q = netcb.ni_forw;
for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
if (q != p && q->ni_line > p->ni_line) {
q->ni_line--;
/* this shouldn't be necessary */
q->ni_flags |= NIF_LACHG|NIF_FACHG;
}
lastrow--;
q = p->ni_forw;
p->ni_prev->ni_forw = p->ni_forw;
p->ni_forw->ni_prev = p->ni_prev;
free(p);
p = q;
}
/*
* Update existing connections and add new ones.
*/
for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
if (p->ni_line == -1) {
/*
* Add a new entry if possible.
*/
if (lastrow > YMAX(wnd))
continue;
p->ni_line = lastrow++;
p->ni_flags |= NIF_LACHG|NIF_FACHG;
}
if (p->ni_flags & NIF_LACHG) {
wmove(wnd, p->ni_line, LADDR);
inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
p->ni_flags &= ~NIF_LACHG;
}
if (p->ni_flags & NIF_FACHG) {
wmove(wnd, p->ni_line, FADDR);
inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
p->ni_flags &= ~NIF_FACHG;
}
mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
if (streq(p->ni_proto, "tcp"))
if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
mvwprintw(wnd, p->ni_line, STATE, "%d",
p->ni_state);
else
mvwaddstr(wnd, p->ni_line, STATE,
tcpstates[p->ni_state]);
wclrtoeol(wnd);
}
if (lastrow < YMAX(wnd)) {
wmove(wnd, lastrow, 0); wclrtobot(wnd);
wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd); /* XXX */
}
}
/*
* Pretty print an Internet address (net address + port).
* If the nflag was specified, use numbers instead of names.
*/
static void
inetprint(in, port, proto)
register struct in_addr *in;
int port;
char *proto;
{
struct servent *sp = 0;
char line[80], *cp, *index();
sprintf(line, "%.*s.", 16, inetname(*in));
cp = index(line, '\0');
if (!nflag && port)
sp = getservbyport(port, proto);
if (sp || port == 0)
sprintf(cp, "%.8s", sp ? sp->s_name : "*");
else
sprintf(cp, "%d", ntohs((u_short)port));
/* pad to full column to clear any garbage */
cp = index(line, '\0');
while (cp - line < 22)
*cp++ = ' ';
*cp = '\0';
waddstr(wnd, line);
}
/*
* Construct an Internet address representation.
* If the nflag has been supplied, give
* numeric value, otherwise try for symbolic name.
*/
static char *
inetname(in)
struct in_addr in;
{
char *cp = 0;
static char line[50];
struct hostent *hp;
struct netent *np;
if (!nflag && in.s_addr != INADDR_ANY) {
int net = inet_netof(in);
int lna = inet_lnaof(in);
if (lna == INADDR_ANY) {
np = getnetbyaddr(net, AF_INET);
if (np)
cp = np->n_name;
}
if (cp == 0) {
hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
if (hp)
cp = hp->h_name;
}
}
if (in.s_addr == INADDR_ANY)
strcpy(line, "*");
else if (cp)
strcpy(line, cp);
else {
in.s_addr = ntohl(in.s_addr);
#define C(x) ((x) & 0xff)
sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
}
return (line);
}
int
cmdnetstat(cmd, args)
char *cmd, *args;
{
register struct netinfo *p;
if (prefix(cmd, "all")) {
aflag = !aflag;
goto fixup;
}
if (prefix(cmd, "numbers") || prefix(cmd, "names")) {
int new;
new = prefix(cmd, "numbers");
if (new == nflag)
return (1);
p = netcb.ni_forw;
for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
if (p->ni_line == -1)
continue;
p->ni_flags |= NIF_LACHG|NIF_FACHG;
}
nflag = new;
goto redisplay;
}
if (!netcmd(cmd, args))
return (0);
fixup:
fetchnetstat();
redisplay:
shownetstat();
refresh();
return (1);
}