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freebsd/usr.bin/netstat/main.c
Jonathan T. Looney 2529f56ed3 Add the "TCP Blackbox Recorder" which we discussed at the developer 
summits at BSDCan and BSDCam in 2017.

The TCP Blackbox Recorder allows you to capture events on a TCP connection
in a ring buffer. It stores metadata with the event. It optionally stores
the TCP header associated with an event (if the event is associated with a
packet) and also optionally stores information on the sockets.

It supports setting a log ID on a TCP connection and using this to correlate
multiple connections that share a common log ID.

You can log connections in different modes. If you are doing a coordinated
test with a particular connection, you may tell the system to put it in
mode 4 (continuous dump). Or, if you just want to monitor for errors, you
can put it in mode 1 (ring buffer) and dump all the ring buffers associated
with the connection ID when we receive an error signal for that connection
ID. You can set a default mode that will be applied to a particular ratio
of incoming connections. You can also manually set a mode using a socket
option.

This commit includes only basic probes. rrs@ has added quite an abundance
of probes in his TCP development work. He plans to commit those soon.

There are user-space programs which we plan to commit as ports. These read
the data from the log device and output pcapng files, and then let you
analyze the data (and metadata) in the pcapng files.

Reviewed by:	gnn (previous version)
Obtained from:	Netflix, Inc.
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D11085
2018-03-22 09:40:08 +00:00

879 lines
20 KiB
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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>
#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>
#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[] = {
{ N_TCBINFO, N_TCPSTAT, 1, protopr,
tcp_stats, NULL, "tcp", 1, IPPROTO_TCP },
{ N_UDBINFO, 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
{ N_DIVCBINFO, -1, 1, protopr,
NULL, NULL, "divert", 1, IPPROTO_DIVERT },
{ N_RIPCBINFO, N_IPSTAT, 1, protopr,
ip_stats, NULL, "ip", 1, IPPROTO_RAW },
{ N_RIPCBINFO, N_ICMPSTAT, 1, protopr,
icmp_stats, NULL, "icmp", 1, IPPROTO_ICMP },
{ N_RIPCBINFO, 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
{ N_RIPCBINFO, 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[] = {
{ N_TCBINFO, N_TCPSTAT, 1, protopr,
tcp_stats, NULL, "tcp", 1, IPPROTO_TCP },
{ N_UDBINFO, N_UDPSTAT, 1, protopr,
udp_stats, NULL, "udp", 1, IPPROTO_UDP },
{ N_RIPCBINFO, N_IP6STAT, 1, protopr,
ip6_stats, ip6_ifstats, "ip6", 1, IPPROTO_RAW },
{ N_RIPCBINFO, 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);
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 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 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 */
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;
af = AF_UNSPEC;
argc = xo_parse_args(argc, argv);
if (argc < 0)
exit(EXIT_FAILURE);
while ((ch = getopt(argc, argv, "46AaBbdF:f:ghI:iLlM:mN:nPp: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 '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 '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 '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
/*
* 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) {
rt_stats();
} else
routepr(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 [-46AaLnRSTWx] [-f protocol_family | -p protocol]\n"
" [-M core] [-N system]",
" netstat -i | -I interface [-46abdhnW] [-f address_family]\n"
" [-M core] [-N system]",
" netstat -w wait [-I interface] [-46d] [-M core] [-N system]\n"
" [-q howmany]",
" netstat -s [-46sz] [-f protocol_family | -p protocol]\n"
" [-M core] [-N system]",
" netstat -i | -I interface -s [-46s]\n"
" [-f protocol_family | -p protocol] [-M core] [-N system]",
" netstat -m [-M core] [-N system]",
" netstat -B [-z] [-I interface]",
" netstat -r [-46AnW] [-F fibnum] [-f address_family]\n"
" [-M core] [-N system]",
" netstat -rs [-s] [-M core] [-N system]",
" netstat -g [-46W] [-f address_family] [-M core] [-N system]",
" netstat -gs [-46s] [-f address_family] [-M core] [-N system]",
" netstat -Q");
xo_finish();
exit(1);
}
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