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HardenedBSD/usr.bin/netstat/main.c
Doug Rabson 182e8ae26d netstat(1): teach netstat to attach to jails 
Add -j <jail> flag to netstat(1) to allow access to network information
from a jail.

MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D41446
2023-08-16 14:05:13 +01:00

945 lines
21 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1983, 1988, 1993
* 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.
*/
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1983, 1988, 1993\n\
Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)main.c 8.4 (Berkeley) 3/1/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/file.h>
#ifdef JAIL
#include <sys/jail.h>
#endif
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#ifdef NETGRAPH
#include <netgraph/ng_socket.h>
#endif
#include <ctype.h>
#include <err.h>
#include <errno.h>
#ifdef JAIL
#include <jail.h>
#endif
#include <kvm.h>
#include <limits.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include "netstat.h"
#include "nl_defs.h"
#include <libxo/xo.h>
static struct protox {
int pr_index; /* index into nlist of cb head */
int pr_sindex; /* index into nlist of stat block */
u_char pr_wanted; /* 1 if wanted, 0 otherwise */
void (*pr_cblocks)(u_long, const char *, int, int);
/* control blocks printing routine */
void (*pr_stats)(u_long, const char *, int, int);
/* statistics printing routine */
void (*pr_istats)(char *); /* per/if statistics printing routine */
const char *pr_name; /* well-known name */
int pr_usesysctl; /* non-zero if we use sysctl, not kvm */
int pr_protocol;
} protox[] = {
{ -1 , N_TCPSTAT, 1, protopr,
tcp_stats, NULL, "tcp", 1, IPPROTO_TCP },
{ -1 , N_UDPSTAT, 1, protopr,
udp_stats, NULL, "udp", 1, IPPROTO_UDP },
#ifdef SCTP
{ -1, N_SCTPSTAT, 1, sctp_protopr,
sctp_stats, NULL, "sctp", 1, IPPROTO_SCTP },
#endif
#ifdef SDP
{ -1, -1, 1, protopr,
NULL, NULL, "sdp", 1, IPPROTO_TCP },
#endif
{ -1 , -1, 1, protopr,
divert_stats, NULL, "divert", 1, 0 },
{ -1 , N_IPSTAT, 1, protopr,
ip_stats, NULL, "ip", 1, IPPROTO_RAW },
{ -1 , N_ICMPSTAT, 1, protopr,
icmp_stats, NULL, "icmp", 1, IPPROTO_ICMP },
{ -1 , N_IGMPSTAT, 1, protopr,
igmp_stats, NULL, "igmp", 1, IPPROTO_IGMP },
#ifdef IPSEC
{ -1, N_IPSEC4STAT, 1, NULL, /* keep as compat */
ipsec_stats, NULL, "ipsec", 1, 0},
{ -1, N_AHSTAT, 1, NULL,
ah_stats, NULL, "ah", 1, 0},
{ -1, N_ESPSTAT, 1, NULL,
esp_stats, NULL, "esp", 1, 0},
{ -1, N_IPCOMPSTAT, 1, NULL,
ipcomp_stats, NULL, "ipcomp", 1, 0},
#endif
{ -1 , N_PIMSTAT, 1, protopr,
pim_stats, NULL, "pim", 1, IPPROTO_PIM },
{ -1, N_CARPSTATS, 1, NULL,
carp_stats, NULL, "carp", 1, 0 },
#ifdef PF
{ -1, N_PFSYNCSTATS, 1, NULL,
pfsync_stats, NULL, "pfsync", 1, 0 },
#endif
{ -1, N_ARPSTAT, 1, NULL,
arp_stats, NULL, "arp", 1, 0 },
{ -1, -1, 0, NULL,
NULL, NULL, NULL, 0, 0 }
};
#ifdef INET6
static struct protox ip6protox[] = {
{ -1 , N_TCPSTAT, 1, protopr,
tcp_stats, NULL, "tcp", 1, IPPROTO_TCP },
{ -1 , N_UDPSTAT, 1, protopr,
udp_stats, NULL, "udp", 1, IPPROTO_UDP },
{ -1 , N_IP6STAT, 1, protopr,
ip6_stats, ip6_ifstats, "ip6", 1, IPPROTO_RAW },
{ -1 , N_ICMP6STAT, 1, protopr,
icmp6_stats, icmp6_ifstats, "icmp6", 1, IPPROTO_ICMPV6 },
#ifdef SDP
{ -1, -1, 1, protopr,
NULL, NULL, "sdp", 1, IPPROTO_TCP },
#endif
#ifdef IPSEC
{ -1, N_IPSEC6STAT, 1, NULL,
ipsec_stats, NULL, "ipsec6", 1, 0 },
#endif
#ifdef notyet
{ -1, N_PIM6STAT, 1, NULL,
pim6_stats, NULL, "pim6", 1, 0 },
#endif
{ -1, N_RIP6STAT, 1, NULL,
rip6_stats, NULL, "rip6", 1, 0 },
{ -1, -1, 0, NULL,
NULL, NULL, NULL, 0, 0 }
};
#endif /*INET6*/
#ifdef IPSEC
static struct protox pfkeyprotox[] = {
{ -1, N_PFKEYSTAT, 1, NULL,
pfkey_stats, NULL, "pfkey", 0, 0 },
{ -1, -1, 0, NULL,
NULL, NULL, NULL, 0, 0 }
};
#endif
#ifdef NETGRAPH
static struct protox netgraphprotox[] = {
{ N_NGSOCKLIST, -1, 1, netgraphprotopr,
NULL, NULL, "ctrl", 0, 0 },
{ N_NGSOCKLIST, -1, 1, netgraphprotopr,
NULL, NULL, "data", 0, 0 },
{ -1, -1, 0, NULL,
NULL, NULL, NULL, 0, 0 }
};
#endif
static struct protox *protoprotox[] = {
protox,
#ifdef INET6
ip6protox,
#endif
#ifdef IPSEC
pfkeyprotox,
#endif
NULL };
static void printproto(struct protox *, const char *, bool *);
static void usage(void) __dead2;
static struct protox *name2protox(const char *);
static struct protox *knownname(const char *);
static int kresolve_list(struct nlist *_nl);
static kvm_t *kvmd;
static char *nlistf = NULL, *memf = NULL;
int Aflag; /* show addresses of protocol control block */
int aflag; /* show all sockets (including servers) */
static int Bflag; /* show information about bpf consumers */
int bflag; /* show i/f total bytes in/out */
int cflag; /* show TCP congestion control stack */
int Cflag; /* show congestion control algo and vars */
int dflag; /* show i/f dropped packets */
int gflag; /* show group (multicast) routing or stats */
int hflag; /* show counters in human readable format */
int iflag; /* show interfaces */
int Lflag; /* show size of listen queues */
int mflag; /* show memory stats */
int noutputs = 0; /* how much outputs before we exit */
int numeric_addr; /* show addresses numerically */
int numeric_port; /* show ports numerically */
int Oflag; /* show nhgrp objects*/
int oflag; /* show nexthop objects*/
int Pflag; /* show TCP log ID */
static int pflag; /* show given protocol */
static int Qflag; /* show netisr information */
int rflag; /* show routing tables (or routing stats) */
int Rflag; /* show flow / RSS statistics */
int sflag; /* show protocol statistics */
int Wflag; /* wide display */
int Tflag; /* TCP Information */
int xflag; /* extra information, includes all socket buffer info */
int zflag; /* zero stats */
int interval; /* repeat interval for i/f stats */
char *interface; /* desired i/f for stats, or NULL for all i/fs */
int unit; /* unit number for above */
#ifdef JAIL
char *jail_name; /* desired jail to operate in */
#endif
static int af; /* address family */
int live; /* true if we are examining a live system */
int
main(int argc, char *argv[])
{
struct protox *tp = NULL; /* for printing cblocks & stats */
int ch;
int fib = -1;
char *endptr;
bool first = true;
#ifdef JAIL
int jid;
#endif
af = AF_UNSPEC;
argc = xo_parse_args(argc, argv);
if (argc < 0)
exit(EXIT_FAILURE);
while ((ch = getopt(argc, argv, "46AaBbCcdF:f:ghI:ij:LlM:mN:nOoPp:Qq:RrSTsuWw:xz"))
!= -1)
switch(ch) {
case '4':
#ifdef INET
af = AF_INET;
#else
errx(1, "IPv4 support is not compiled in");
#endif
break;
case '6':
#ifdef INET6
af = AF_INET6;
#else
errx(1, "IPv6 support is not compiled in");
#endif
break;
case 'A':
Aflag = 1;
break;
case 'a':
aflag = 1;
break;
case 'B':
Bflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'C':
Cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'F':
fib = strtol(optarg, &endptr, 0);
if (*endptr != '\0' ||
(fib == 0 && (errno == EINVAL || errno == ERANGE)))
xo_errx(1, "%s: invalid fib", optarg);
break;
case 'f':
if (strcmp(optarg, "inet") == 0)
af = AF_INET;
#ifdef INET6
else if (strcmp(optarg, "inet6") == 0)
af = AF_INET6;
#endif
#ifdef IPSEC
else if (strcmp(optarg, "pfkey") == 0)
af = PF_KEY;
#endif
else if (strcmp(optarg, "unix") == 0 ||
strcmp(optarg, "local") == 0)
af = AF_UNIX;
#ifdef NETGRAPH
else if (strcmp(optarg, "ng") == 0
|| strcmp(optarg, "netgraph") == 0)
af = AF_NETGRAPH;
#endif
else if (strcmp(optarg, "link") == 0)
af = AF_LINK;
else {
xo_errx(1, "%s: unknown address family",
optarg);
}
break;
case 'g':
gflag = 1;
break;
case 'h':
hflag = 1;
break;
case 'I': {
char *cp;
iflag = 1;
for (cp = interface = optarg; isalpha(*cp); cp++)
continue;
unit = atoi(cp);
break;
}
case 'i':
iflag = 1;
break;
case 'j':
#ifdef JAIL
if (optarg == NULL)
usage();
jail_name = optarg;
#else
errx(1, "Jail support is not compiled in");
#endif
break;
case 'L':
Lflag = 1;
break;
case 'M':
memf = optarg;
break;
case 'm':
mflag = 1;
break;
case 'N':
nlistf = optarg;
break;
case 'n':
numeric_addr = numeric_port = 1;
break;
case 'o':
oflag = 1;
break;
case 'O':
Oflag = 1;
break;
case 'P':
Pflag = 1;
break;
case 'p':
if ((tp = name2protox(optarg)) == NULL) {
xo_errx(1, "%s: unknown or uninstrumented "
"protocol", optarg);
}
pflag = 1;
break;
case 'Q':
Qflag = 1;
break;
case 'q':
noutputs = atoi(optarg);
if (noutputs != 0)
noutputs++;
break;
case 'r':
rflag = 1;
break;
case 'R':
Rflag = 1;
break;
case 's':
++sflag;
break;
case 'S':
numeric_addr = 1;
break;
case 'u':
af = AF_UNIX;
break;
case 'W':
case 'l':
Wflag = 1;
break;
case 'w':
interval = atoi(optarg);
iflag = 1;
break;
case 'T':
Tflag = 1;
break;
case 'x':
xflag = 1;
break;
case 'z':
zflag = 1;
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;
#define BACKWARD_COMPATIBILITY
#ifdef BACKWARD_COMPATIBILITY
if (*argv) {
if (isdigit(**argv)) {
interval = atoi(*argv);
if (interval <= 0)
usage();
++argv;
iflag = 1;
}
if (*argv) {
nlistf = *argv;
if (*++argv)
memf = *argv;
}
}
#endif
#ifdef JAIL
if (jail_name != NULL) {
jid = jail_getid(jail_name);
if (jid == -1)
errx(1, "Jail not found");
if (jail_attach(jid) != 0)
errx(1, "Cannot attach to jail");
}
#endif
/*
* Discard setgid privileges if not the running kernel so that bad
* guys can't print interesting stuff from kernel memory.
*/
live = (nlistf == NULL && memf == NULL);
if (!live) {
if (setgid(getgid()) != 0)
xo_err(-1, "setgid");
/* Load all necessary kvm symbols */
kresolve_list(nl);
}
if (xflag && Tflag)
xo_errx(1, "-x and -T are incompatible, pick one.");
if (Bflag) {
if (!live)
usage();
bpf_stats(interface);
xo_finish();
exit(0);
}
if (mflag) {
if (!live) {
if (kread(0, NULL, 0) == 0)
mbpr(kvmd, nl[N_SFSTAT].n_value);
} else
mbpr(NULL, 0);
xo_finish();
exit(0);
}
if (Qflag) {
if (!live) {
if (kread(0, NULL, 0) == 0)
netisr_stats();
} else
netisr_stats();
xo_finish();
exit(0);
}
#if 0
/*
* Keep file descriptors open to avoid overhead
* of open/close on each call to get* routines.
*/
sethostent(1);
setnetent(1);
#else
/*
* This does not make sense any more with DNS being default over
* the files. Doing a setXXXXent(1) causes a tcp connection to be
* used for the queries, which is slower.
*/
#endif
if (iflag && !sflag) {
xo_open_container("statistics");
intpr(NULL, af);
xo_close_container("statistics");
xo_finish();
exit(0);
}
if (rflag) {
xo_open_container("statistics");
if (sflag) {
if (live) {
kresolve_list(nl);
}
rt_stats();
} else
routepr(fib, af);
xo_close_container("statistics");
xo_finish();
exit(0);
}
if (oflag) {
xo_open_container("statistics");
nhops_print(fib, af);
xo_close_container("statistics");
xo_finish();
exit(0);
}
if (Oflag) {
xo_open_container("statistics");
nhgrp_print(fib, af);
xo_close_container("statistics");
xo_finish();
exit(0);
}
if (gflag) {
xo_open_container("statistics");
if (sflag) {
if (af == AF_INET || af == AF_UNSPEC)
mrt_stats();
#ifdef INET6
if (af == AF_INET6 || af == AF_UNSPEC)
mrt6_stats();
#endif
} else {
if (af == AF_INET || af == AF_UNSPEC)
mroutepr();
#ifdef INET6
if (af == AF_INET6 || af == AF_UNSPEC)
mroute6pr();
#endif
}
xo_close_container("statistics");
xo_finish();
exit(0);
}
if (tp) {
xo_open_container("statistics");
printproto(tp, tp->pr_name, &first);
if (!first)
xo_close_list("socket");
xo_close_container("statistics");
xo_finish();
exit(0);
}
xo_open_container("statistics");
if (af == AF_INET || af == AF_UNSPEC)
for (tp = protox; tp->pr_name; tp++)
printproto(tp, tp->pr_name, &first);
#ifdef INET6
if (af == AF_INET6 || af == AF_UNSPEC)
for (tp = ip6protox; tp->pr_name; tp++)
printproto(tp, tp->pr_name, &first);
#endif /*INET6*/
#ifdef IPSEC
if (af == PF_KEY || af == AF_UNSPEC)
for (tp = pfkeyprotox; tp->pr_name; tp++)
printproto(tp, tp->pr_name, &first);
#endif /*IPSEC*/
#ifdef NETGRAPH
if (af == AF_NETGRAPH || af == AF_UNSPEC)
for (tp = netgraphprotox; tp->pr_name; tp++)
printproto(tp, tp->pr_name, &first);
#endif /* NETGRAPH */
if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
unixpr(nl[N_UNP_COUNT].n_value, nl[N_UNP_GENCNT].n_value,
nl[N_UNP_DHEAD].n_value, nl[N_UNP_SHEAD].n_value,
nl[N_UNP_SPHEAD].n_value, &first);
if (!first)
xo_close_list("socket");
xo_close_container("statistics");
xo_finish();
exit(0);
}
static int
fetch_stats_internal(const char *sysctlname, u_long off, void *stats,
size_t len, kreadfn_t kreadfn, int zero)
{
int error;
if (live) {
memset(stats, 0, len);
if (zero)
error = sysctlbyname(sysctlname, NULL, NULL, stats,
len);
else
error = sysctlbyname(sysctlname, stats, &len, NULL, 0);
if (error == -1 && errno != ENOENT)
xo_warn("sysctl %s", sysctlname);
} else {
if (off == 0)
return (1);
error = kreadfn(off, stats, len);
}
return (error);
}
int
fetch_stats(const char *sysctlname, u_long off, void *stats,
size_t len, kreadfn_t kreadfn)
{
return (fetch_stats_internal(sysctlname, off, stats, len, kreadfn,
zflag));
}
int
fetch_stats_ro(const char *sysctlname, u_long off, void *stats,
size_t len, kreadfn_t kreadfn)
{
return (fetch_stats_internal(sysctlname, off, stats, len, kreadfn, 0));
}
/*
* Print out protocol statistics or control blocks (per sflag).
* If the interface was not specifically requested, and the symbol
* is not in the namelist, ignore this one.
*/
static void
printproto(struct protox *tp, const char *name, bool *first)
{
void (*pr)(u_long, const char *, int, int);
u_long off;
bool doingdblocks = false;
if (sflag) {
if (iflag) {
if (tp->pr_istats)
intpr(tp->pr_istats, af);
else if (pflag)
xo_message("%s: no per-interface stats routine",
tp->pr_name);
return;
} else {
pr = tp->pr_stats;
if (!pr) {
if (pflag)
xo_message("%s: no stats routine",
tp->pr_name);
return;
}
if (tp->pr_usesysctl && live)
off = 0;
else if (tp->pr_sindex < 0) {
if (pflag)
xo_message("%s: stats routine doesn't "
"work on cores", tp->pr_name);
return;
} else
off = nl[tp->pr_sindex].n_value;
}
} else {
doingdblocks = true;
pr = tp->pr_cblocks;
if (!pr) {
if (pflag)
xo_message("%s: no PCB routine", tp->pr_name);
return;
}
if (tp->pr_usesysctl && live)
off = 0;
else if (tp->pr_index < 0) {
if (pflag)
xo_message("%s: PCB routine doesn't work on "
"cores", tp->pr_name);
return;
} else
off = nl[tp->pr_index].n_value;
}
if (pr != NULL && (off || (live && tp->pr_usesysctl) ||
af != AF_UNSPEC)) {
if (doingdblocks && *first) {
xo_open_list("socket");
*first = false;
}
(*pr)(off, name, af, tp->pr_protocol);
}
}
static int
kvmd_init(void)
{
char errbuf[_POSIX2_LINE_MAX];
if (kvmd != NULL)
return (0);
kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
if (setgid(getgid()) != 0)
xo_err(-1, "setgid");
if (kvmd == NULL) {
xo_warnx("kvm not available: %s", errbuf);
return (-1);
}
return (0);
}
/*
* Resolve symbol list, return 0 on success.
*/
static int
kresolve_list(struct nlist *_nl)
{
if ((kvmd == NULL) && (kvmd_init() != 0))
return (-1);
if (_nl[0].n_type != 0)
return (0);
if (kvm_nlist(kvmd, _nl) < 0) {
if (nlistf)
xo_errx(1, "%s: kvm_nlist: %s", nlistf,
kvm_geterr(kvmd));
else
xo_errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
}
return (0);
}
/*
* Wrapper of kvm_dpcpu_setcpu().
*/
void
kset_dpcpu(u_int cpuid)
{
if ((kvmd == NULL) && (kvmd_init() != 0))
xo_errx(-1, "%s: kvm is not available", __func__);
if (kvm_dpcpu_setcpu(kvmd, cpuid) < 0)
xo_errx(-1, "%s: kvm_dpcpu_setcpu(%u): %s", __func__,
cpuid, kvm_geterr(kvmd));
return;
}
/*
* Read kernel memory, return 0 on success.
*/
int
kread(u_long addr, void *buf, size_t size)
{
if (kvmd_init() < 0)
return (-1);
if (!buf)
return (0);
if (kvm_read(kvmd, addr, buf, size) != (ssize_t)size) {
xo_warnx("%s", kvm_geterr(kvmd));
return (-1);
}
return (0);
}
/*
* Read single counter(9).
*/
uint64_t
kread_counter(u_long addr)
{
if (kvmd_init() < 0)
return (-1);
return (kvm_counter_u64_fetch(kvmd, addr));
}
/*
* Read an array of N counters in kernel memory into array of N uint64_t's.
*/
int
kread_counters(u_long addr, void *buf, size_t size)
{
uint64_t *c;
u_long *counters;
size_t i, n;
if (kvmd_init() < 0)
return (-1);
if (size % sizeof(uint64_t) != 0) {
xo_warnx("kread_counters: invalid counter set size");
return (-1);
}
n = size / sizeof(uint64_t);
if ((counters = malloc(n * sizeof(u_long))) == NULL)
xo_err(-1, "malloc");
if (kread(addr, counters, n * sizeof(u_long)) < 0) {
free(counters);
return (-1);
}
c = buf;
for (i = 0; i < n; i++)
c[i] = kvm_counter_u64_fetch(kvmd, counters[i]);
free(counters);
return (0);
}
const char *
plural(uintmax_t n)
{
return (n != 1 ? "s" : "");
}
const char *
plurales(uintmax_t n)
{
return (n != 1 ? "es" : "");
}
const char *
pluralies(uintmax_t n)
{
return (n != 1 ? "ies" : "y");
}
/*
* Find the protox for the given "well-known" name.
*/
static struct protox *
knownname(const char *name)
{
struct protox **tpp, *tp;
for (tpp = protoprotox; *tpp; tpp++)
for (tp = *tpp; tp->pr_name; tp++)
if (strcmp(tp->pr_name, name) == 0)
return (tp);
return (NULL);
}
/*
* Find the protox corresponding to name.
*/
static struct protox *
name2protox(const char *name)
{
struct protox *tp;
char **alias; /* alias from p->aliases */
struct protoent *p;
/*
* Try to find the name in the list of "well-known" names. If that
* fails, check if name is an alias for an Internet protocol.
*/
if ((tp = knownname(name)) != NULL)
return (tp);
setprotoent(1); /* make protocol lookup cheaper */
while ((p = getprotoent()) != NULL) {
/* assert: name not same as p->name */
for (alias = p->p_aliases; *alias; alias++)
if (strcmp(name, *alias) == 0) {
endprotoent();
return (knownname(p->p_name));
}
}
endprotoent();
return (NULL);
}
static void
usage(void)
{
(void)xo_error("%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: netstat [-j jail] [-46AaCcLnRSTWx] [-f protocol_family | -p protocol]\n"
" [-M core] [-N system]",
" netstat [-j jail] -i | -I interface [-46abdhnW] [-f address_family]\n"
" [-M core] [-N system]",
" netstat [-j jail] -w wait [-I interface] [-46d] [-M core] [-N system]\n"
" [-q howmany]",
" netstat [-j jail] -s [-46sz] [-f protocol_family | -p protocol]\n"
" [-M core] [-N system]",
" netstat [-j jail] -i | -I interface -s [-46s]\n"
" [-f protocol_family | -p protocol] [-M core] [-N system]",
" netstat [-j jail] -m [-M core] [-N system]",
" netstat [-j jail] -B [-z] [-I interface]",
" netstat [-j jail] -r [-46AnW] [-F fibnum] [-f address_family]\n"
" [-M core] [-N system]",
" netstat [-j jail] -rs [-s] [-M core] [-N system]",
" netstat [-j jail] -g [-46W] [-f address_family] [-M core] [-N system]",
" netstat [-j jail] -gs [-46s] [-f address_family] [-M core] [-N system]",
" netstat [-j jail] -Q");
xo_finish();
exit(1);
}
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