NetBSD-5.0.2/usr.bin/systat/netstat.c
/* $NetBSD: netstat.c,v 1.28 2006/10/22 16:43:24 christos Exp $ */
/*-
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: netstat.c,v 1.28 2006/10/22 16:43:24 christos Exp $");
#endif /* not lint */
/*
* netstat
*/
#include <sys/param.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <netinet/in.h>
#include <arpa/inet.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>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#endif
#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 "systat.h"
#include "extern.h"
static void fetchnetstat4(void *, int);
static void enter(struct inpcb *, struct socket *, int, const char *);
static const char *inetname(struct in_addr);
static void inetprint(struct in_addr *, int, const char *);
#ifdef INET6
static void fetchnetstat6(void *, int);
static void enter6(struct in6pcb *, struct socket *, int, const char *);
static const char *inet6name(struct in6_addr *);
static void inet6print(struct in6_addr *, int, const char *);
#endif
#define streq(a,b) (strcmp(a,b)==0)
struct netinfo {
struct netinfo *ni_forw, *ni_prev;
int ni_family;
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 */
const char *ni_proto; /* protocol */
struct in_addr ni_laddr; /* local address */
#ifdef INET6
struct in6_addr ni_laddr6; /* local address */
#endif
long ni_lport; /* local port */
struct in_addr ni_faddr; /* foreign address */
#ifdef INET6
struct in6_addr ni_faddr6; /* foreign address */
#endif
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;
struct netinfo *nhead;
static int aflag = 0;
int nflag = 0;
static int lastrow = 1;
WINDOW *
opennetstat(void)
{
sethostent(1);
setnetent(1);
return (subwin(stdscr, -1, 0, 5, 0));
}
void
closenetstat(WINDOW *w)
{
struct netinfo *p;
endhostent();
endnetent();
p = netcb.ni_forw;
while (p != nhead) {
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_TCBTABLE 0
{ .n_name = "_tcbtable" },
#define X_UDBTABLE 1
{ .n_name = "_udbtable" },
{ .n_name = NULL },
};
int
initnetstat(void)
{
int n;
n = kvm_nlist(kd, namelist);
if (n < 0) {
nlisterr(namelist);
return(0);
} else if (n == sizeof(namelist) / sizeof(namelist[0]) - 1) {
error("No symbols in namelist");
return(0);
}
nhead = (struct netinfo *)(void *)&netcb;
netcb.ni_forw = netcb.ni_prev = nhead;
protos = TCP|UDP;
return(1);
}
void
fetchnetstat(void)
{
struct netinfo *p;
if (namelist[X_TCBTABLE].n_value == 0)
return;
for (p = netcb.ni_forw; p != nhead; p = p->ni_forw)
p->ni_seen = 0;
if ((protos & (TCP | UDP)) == 0) {
error("No protocols to display");
return;
}
if ((protos & TCP) && namelist[X_TCBTABLE].n_type)
fetchnetstat4(NPTR(X_TCBTABLE), 1);
if ((protos & UDP) && namelist[X_UDBTABLE].n_type)
fetchnetstat4(NPTR(X_UDBTABLE), 0);
#ifdef INET6
if ((protos & TCP) && namelist[X_TCBTABLE].n_type)
fetchnetstat6(NPTR(X_TCBTABLE), 1);
if ((protos & UDP) && namelist[X_UDBTABLE].n_type)
fetchnetstat6(NPTR(X_UDBTABLE), 0);
#endif
}
static void
fetchnetstat4(void *off, int istcp)
{
struct inpcbtable pcbtable;
struct inpcb *head, *prev, *next;
struct netinfo *p;
struct inpcb inpcb;
struct socket sockb;
struct tcpcb tcpcb;
KREAD(off, &pcbtable, sizeof pcbtable);
prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue;
next = (struct inpcb *)pcbtable.inpt_queue.cqh_first;
while (next != head) {
KREAD(next, &inpcb, sizeof (inpcb));
if ((struct inpcb *)inpcb.inp_queue.cqe_prev != prev) {
for (p = netcb.ni_forw; p != nhead; p = p->ni_forw)
p->ni_seen = 1;
error("Kernel state in transition");
return;
}
prev = next;
next = (struct inpcb *)inpcb.inp_queue.cqe_next;
if (inpcb.inp_af != AF_INET)
continue;
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");
}
}
#ifdef INET6
static void
fetchnetstat6(void *off, int istcp)
{
struct inpcbtable pcbtable;
struct in6pcb *head6, *prev6, *next6;
struct netinfo *p;
struct socket sockb;
struct tcpcb tcpcb;
struct in6pcb in6pcb;
KREAD(off, &pcbtable, sizeof pcbtable);
prev6 = head6 = (struct in6pcb *)&((struct inpcbtable *)off)->inpt_queue;
next6 = (struct in6pcb *)pcbtable.inpt_queue.cqh_first;
while (next6 != head6) {
KREAD(next6, &in6pcb, sizeof (in6pcb));
if ((struct in6pcb *)in6pcb.in6p_queue.cqe_prev != prev6) {
for (p = netcb.ni_forw; p != nhead; p = p->ni_forw)
p->ni_seen = 1;
error("Kernel state in transition");
return;
}
prev6 = next6;
next6 = (struct in6pcb *)in6pcb.in6p_queue.cqe_next;
if (in6pcb.in6p_af != AF_INET6)
continue;
if (!aflag && IN6_IS_ADDR_UNSPECIFIED(&in6pcb.in6p_laddr))
continue;
if (nhosts && !checkhost6(&in6pcb))
continue;
if (nports && !checkport6(&in6pcb))
continue;
KREAD(in6pcb.in6p_socket, &sockb, sizeof (sockb));
if (istcp) {
KREAD(in6pcb.in6p_ppcb, &tcpcb, sizeof (tcpcb));
enter6(&in6pcb, &sockb, tcpcb.t_state, "tcp");
} else
enter6(&in6pcb, &sockb, 0, "udp");
}
}
#endif /*INET6*/
static void
enter(struct inpcb *inp, struct socket *so, int state, const char *proto)
{
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 != nhead; p = p->ni_forw) {
if (p->ni_family != AF_INET)
continue;
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 == nhead) {
if ((p = malloc(sizeof(*p))) == NULL) {
error("Out of memory");
return;
}
p->ni_prev = nhead;
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_family = AF_INET;
}
p->ni_rcvcc = so->so_rcv.sb_cc;
p->ni_sndcc = so->so_snd.sb_cc;
p->ni_state = state;
p->ni_seen = 1;
}
#ifdef INET6
static void
enter6(struct in6pcb *in6p, struct socket *so, int state, const char *proto)
{
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 != nhead; p = p->ni_forw) {
if (p->ni_family != AF_INET6)
continue;
if (!streq(proto, p->ni_proto))
continue;
if (p->ni_lport != in6p->in6p_lport ||
!IN6_ARE_ADDR_EQUAL(&p->ni_laddr6, &in6p->in6p_laddr))
continue;
if (IN6_ARE_ADDR_EQUAL(&p->ni_faddr6, &in6p->in6p_faddr) &&
p->ni_fport == in6p->in6p_fport)
break;
}
if (p == nhead) {
if ((p = malloc(sizeof(*p))) == NULL) {
error("Out of memory");
return;
}
p->ni_prev = nhead;
p->ni_forw = netcb.ni_forw;
netcb.ni_forw->ni_prev = p;
netcb.ni_forw = p;
p->ni_line = -1;
p->ni_laddr6 = in6p->in6p_laddr;
p->ni_lport = in6p->in6p_lport;
p->ni_faddr6 = in6p->in6p_faddr;
p->ni_fport = in6p->in6p_fport;
p->ni_proto = proto;
p->ni_flags = NIF_LACHG | NIF_FACHG;
p->ni_family = AF_INET6;
}
p->ni_rcvcc = so->so_rcv.sb_cc;
p->ni_sndcc = so->so_snd.sb_cc;
p->ni_state = state;
p->ni_seen = 1;
}
#endif
/* 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(void)
{
struct netinfo *p;
if (namelist[X_TCBTABLE].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)");
for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) {
if (p->ni_line == -1)
continue;
p->ni_flags |= NIF_LACHG | NIF_FACHG;
}
}
void
shownetstat(void)
{
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 != nhead) {
if (p->ni_line == -1 || p->ni_seen) {
p = p->ni_forw;
continue;
}
wmove(wnd, p->ni_line, 0);
wdeleteln(wnd);
for (q = netcb.ni_forw; q != nhead; 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 != nhead; p = p->ni_forw) {
if (p->ni_line == -1) {
/*
* Add a new entry if possible.
*/
if (lastrow > getmaxy(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);
switch (p->ni_family) {
case AF_INET:
inetprint(&p->ni_laddr, p->ni_lport,
p->ni_proto);
break;
#ifdef INET6
case AF_INET6:
inet6print(&p->ni_laddr6, p->ni_lport,
p->ni_proto);
break;
#endif
}
p->ni_flags &= ~NIF_LACHG;
}
if (p->ni_flags & NIF_FACHG) {
wmove(wnd, p->ni_line, FADDR);
switch (p->ni_family) {
case AF_INET:
inetprint(&p->ni_faddr, p->ni_fport,
p->ni_proto);
break;
#ifdef INET6
case AF_INET6:
inet6print(&p->ni_faddr6, p->ni_fport,
p->ni_proto);
break;
#endif
}
p->ni_flags &= ~NIF_FACHG;
}
mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
#ifdef INET6
if (p->ni_family == AF_INET6)
waddstr(wnd, "6");
#endif
mvwprintw(wnd, p->ni_line, RCVCC, "%6ld", p->ni_rcvcc);
mvwprintw(wnd, p->ni_line, SNDCC, "%6ld", 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 < getmaxy(wnd)) {
wmove(wnd, lastrow, 0); wclrtobot(wnd);
wmove(wnd, getmaxy(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(struct in_addr *in, int port, const char *proto)
{
struct servent *sp = 0;
char line[80], *cp;
(void)snprintf(line, sizeof line, "%.*s.", 16, inetname(*in));
cp = strchr(line, '\0');
if (!nflag && port)
sp = getservbyport(port, proto);
if (sp || port == 0)
(void)snprintf(cp, line + sizeof line - cp, "%.8s",
sp ? sp->s_name : "*");
else
(void)snprintf(cp, line + sizeof line - cp, "%d",
ntohs((u_short)port));
/* pad to full column to clear any garbage */
cp = strchr(line, '\0');
while (cp - line < 22)
*cp++ = ' ';
*cp = '\0';
waddstr(wnd, line);
}
#ifdef INET6
static void
inet6print(struct in6_addr *in6, int port, const char *proto)
{
struct servent *sp = 0;
char line[80], *cp;
(void)snprintf(line, sizeof line, "%.*s.", 16, inet6name(in6));
cp = strchr(line, '\0');
if (!nflag && port)
sp = getservbyport(port, proto);
if (sp || port == 0)
(void)snprintf(cp, line + sizeof line - cp, "%.8s",
sp ? sp->s_name : "*");
else
(void)snprintf(cp, line + sizeof line - cp, "%d",
ntohs((u_short)port));
/* pad to full column to clear any garbage */
cp = strchr(line, '\0');
while (cp - line < 22)
*cp++ = ' ';
*cp = '\0';
waddstr(wnd, line);
}
#endif
/*
* Construct an Internet address representation.
* If the nflag has been supplied, give
* numeric value, otherwise try for symbolic name.
*/
static const char *
inetname(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)
strlcpy(line, "*", sizeof(line));
else if (cp)
strlcpy(line, cp, sizeof(line));
else {
in.s_addr = ntohl(in.s_addr);
#define C(x) ((x) & 0xff)
(void)snprintf(line, sizeof line, "%u.%u.%u.%u",
C(in.s_addr >> 24), C(in.s_addr >> 16),
C(in.s_addr >> 8), C(in.s_addr));
#undef C
}
return (line);
}
#ifdef INET6
static const char *
inet6name(struct in6_addr *in6)
{
static char line[NI_MAXHOST];
struct sockaddr_in6 sin6;
int flags;
if (nflag)
flags = NI_NUMERICHOST;
else
flags = 0;
if (IN6_IS_ADDR_UNSPECIFIED(in6))
return "*";
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *in6;
if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
line, sizeof(line), NULL, 0, flags) == 0)
return line;
return "?";
}
#endif
/* please note: there are also some netstat commands in netcmds.c */
void
netstat_all(char *args)
{
aflag = !aflag;
fetchnetstat();
shownetstat();
refresh();
}
void
netstat_names(char *args)
{
if (nflag == 0)
return;
nflag = 0;
wclear(wnd);
labelnetstat();
shownetstat();
refresh();
}
void
netstat_numbers(char *args)
{
if (nflag != 0)
return;
nflag = 1;
wclear(wnd);
labelnetstat();
shownetstat();
refresh();
}