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When -n is specified, don't attempt to turn hostnames found in utmp

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into addresses as we have no idea what address family they belong to.

When -n is not specified, resolve IPv6 as well as IPv4 addresses found
in the host field of utmp.  Use realhostname_sa() to resolve addresses
(the old code was wrong).

Rename ``x'' to ``x_suffix'' to avoid confusion.

Hard code the host column width to 16 (against the imminent increase
of UT_HOSTSIZE in utmp.h).
This commit is contained in:
Brian Somers 2001-07-26 19:20:13 +00:00
parent 13cf67f317
commit 5b718312b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=80407
3 changed files with 42 additions and 43 deletions
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4
usr.bin/w/Makefile
View File

@ -4,8 +4,8 @@
PROG= w
SRCS= fmt.c pr_time.c proc_compare.c w.c
MAN= w.1 uptime.1
DPADD= ${LIBKVM}
LDADD= -lkvm
DPADD= ${LIBKVM} ${LIBUTIL}
LDADD= -lkvm -lutil
#BINGRP= kmem
#BINMODE=2555
LINKS= ${BINDIR}/w ${BINDIR}/uptime

4
usr.bin/w/w.1
View File

@ -78,9 +78,9 @@ Extract the name list from the specified system instead of the
default
.Dq /kernel .
.It Fl n
Show network addresses as numbers (normally
Don't attempt to resolve network addresses (normally
.Nm
interprets addresses and attempts to display them symbolically).
interprets addresses and attempts to display them as names).
.El
.Pp
If one or more

77
usr.bin/w/w.c
View File

@ -72,6 +72,7 @@ static const char rcsid[] =
#include <fcntl.h>
#include <kvm.h>
#include <langinfo.h>
#include <libutil.h>
#include <limits.h>
#include <locale.h>
#include <netdb.h>
@ -104,7 +105,6 @@ int sortidle; /* sort by idle time */
int use_ampm; /* use AM/PM time */
int use_comma; /* use comma as floats separator */
char **sel_users; /* login array of particular users selected */
char domain[MAXHOSTNAMELEN];
/*
* One of these per active utmp entry.
@ -121,6 +121,9 @@ struct entry {
#define debugproc(p) *((struct kinfo_proc **)&(p)->ki_spare[0])
/* W_DISPHOSTSIZE should not be greater than UT_HOSTSIZE */
#define W_DISPHOSTSIZE 16
static void pr_header __P((time_t *, int));
static struct stat *ttystat __P((char *, int));
static void usage __P((int));
@ -141,8 +144,10 @@ main(argc, argv)
u_long l;
time_t touched;
int ch, i, nentries, nusers, wcmd, longidle, dropgid;
char *memf, *nlistf, *p, *x;
char *memf, *nlistf, *p, *x_suffix;
char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
char fn[MAXHOSTNAMELEN];
char *dot;
(void)setlocale(LC_ALL, "");
use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
@ -276,12 +281,12 @@ main(argc, argv)
#define HEADER_FROM "FROM"
#define HEADER_LOGIN_IDLE "LOGIN@ IDLE "
#define HEADER_WHAT "WHAT\n"
#define WUSED (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
#define WUSED (UT_NAMESIZE + UT_LINESIZE + W_DISPHOSTSIZE + \
sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */
(void)printf("%-*.*s %-*.*s %-*.*s %s",
UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
HEADER_LOGIN_IDLE HEADER_WHAT);
}
@ -351,49 +356,43 @@ main(argc, argv)
}
}
if (!nflag) {
if (gethostname(domain, sizeof(domain) - 1) < 0 ||
(p = strchr(domain, '.')) == NULL)
domain[0] = '\0';
else {
domain[sizeof(domain) - 1] = '\0';
memmove(domain, p, strlen(p) + 1);
}
}
for (ep = ehead; ep != NULL; ep = ep->next) {
char host_buf[UT_HOSTSIZE + 1];
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *)&ss;
struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
int isaddr;
host_buf[UT_HOSTSIZE] = '\0';
strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
p = *host_buf ? host_buf : "-";
if ((x = strchr(p, ':')) != NULL)
*x++ = '\0';
if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
(hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
if (domain[0] != '\0') {
p = hp->h_name;
p += strlen(hp->h_name);
p -= strlen(domain);
if (p > hp->h_name &&
strcasecmp(p, domain) == 0)
*p = '\0';
}
p = hp->h_name;
if ((x_suffix = strrchr(p, ':')) != NULL) {
if ((dot = strchr(x_suffix, '.')) != NULL &&
strchr(dot+1, '.') == NULL)
*x_suffix++ = '\0';
else
x_suffix = NULL;
}
if (nflag && *p && strcmp(p, "-") &&
inet_addr(p) == INADDR_NONE) {
hp = gethostbyname(p);
if (hp != NULL) {
struct in_addr in;
memmove(&in, hp->h_addr, sizeof(in));
p = inet_ntoa(in);
if (!nflag) {
/* Attempt to change an IP address into a name */
isaddr = 0;
memset(&ss, '\0', sizeof(ss));
if (inet_pton(AF_INET6, p, &sin6->sin6_addr) == 1) {
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
isaddr = 1;
} else if (inet_pton(AF_INET, p, &sin->sin_addr) == 1) {
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
isaddr = 1;
}
if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
sa->sa_len) == HOSTNAME_FOUND)
p = fn;
}
if (x) {
(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
if (x_suffix) {
(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
p = buf;
}
if (dflag) {
@ -414,7 +413,7 @@ main(argc, argv)
strncmp(ep->utmp.ut_line, "tty", 3) &&
strncmp(ep->utmp.ut_line, "cua", 3) ?
ep->utmp.ut_line : ep->utmp.ut_line + 3,
UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
pr_attime(&ep->utmp.ut_time, &now);
longidle = pr_idle(ep->idle);
(void)printf("%.*s\n", argwidth - longidle, ep->args);