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This commit is contained in:
Ugen J.S. Antsilevich 1995-02-27 19:48:19 +00:00
parent 0739a0dc6e
commit c120979990
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6775
2 changed files with 47 additions and 13 deletions
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6
usr.sbin/watch/watch.8
View File

@ -9,9 +9,9 @@
.Nd snoop on another tty line
.Sh SYNOPSYS
.Nm watch
.Op Fl ciot
.Op Fl ciotW
.Ar tty
.\" watch [-ciot] [<tty name>]
.\" watch [-ciotW] [<tty name>]
.Sh DESCRIPTION
.Nm Watch
allows the superuser to examine all data coming through a specified tty.
@ -45,6 +45,8 @@ For more info see
.Xr snp 4 .
.It Fl t
Print the date and time when observation of a given tty is started.
.It Fl W
Allow write access to observed tty.
.It Ar tty
Tty may be specified as an tty-style device, such as a pseudo tty device,
a virtual console, or a serial line, etc.

54
usr.sbin/watch/watch.c
View File

@ -17,6 +17,7 @@
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
@ -31,6 +32,7 @@
#define MSG_OFLOW "Snoop stopped due to overflow. Reconnecting."
#define MSG_CLOSED "Snoop stopped due to tty close. Reconnecting."
#define MSG_CHANGE "Snoop device change by user request."
#define MSG_NOWRITE "Snoop device change due to write failure."
#define DEV_NAME_LEN 1024 /* for /dev/ttyXX++ */
@ -44,6 +46,7 @@ int opt_reconn_close = 0;
int opt_reconn_oflow = 0;
int opt_interactive = 1;
int opt_timestamp = 0;
int opt_write = 0;
char dev_name[DEV_NAME_LEN];
int snp_io;
@ -112,12 +115,18 @@ fatal(buf)
int
open_snp()
{
char *snp = "/dev/snpX";
char snp[] = {"/dev/snpX"};
char c;
int f;
int f, mode;
if (opt_write)
mode = O_RDWR;
else
mode = O_RDONLY;
for (c = '0'; c <= '9'; c++) {
snp[8] = c;
if ((f = open(snp, O_RDONLY)) < 0)
if ((f = open(snp, mode)) < 0)
continue;
return f;
}
@ -139,7 +148,7 @@ cleanup()
void
show_usage()
{
printf("watch -[ciot] [tty name]\n");
printf("watch -[ciotW] [tty name]\n");
exit(1);
}
@ -199,10 +208,13 @@ set_dev(name)
struct stat sb;
if (strlen(name) > 5 && !strncmp(name, "/dev/", 5))
strcpy(buf, &(name[5]));
else
strcpy(buf, name);
else {
if (strlen(name) == 2)
sprintf(buf, "/dev/tty%s", name);
else
sprintf(buf, "/dev/%s", name);
}
if (stat(buf, &sb) < 0)
fatal("Bad device name.");
@ -238,6 +250,7 @@ ask_dev(dev_name, msg)
set_tty();
}
#define READB_LEN 5
void
main(ac, av)
@ -246,7 +259,7 @@ main(ac, av)
{
int res, nread, b_size = MIN_SIZE;
extern int optind;
char ch, *buf;
char ch, *buf, chb[READB_LEN];
fd_set fd_s;
if (getuid() != 0)
@ -258,8 +271,11 @@ main(ac, av)
opt_interactive = 0;
while ((ch = getopt(ac, av, "ciot")) != EOF)
while ((ch = getopt(ac, av, "Wciot")) != EOF)
switch (ch) {
case 'W':
opt_write = 1;
break;
case 'c':
opt_reconn_close = 1;
break;
@ -304,16 +320,32 @@ main(ac, av)
FD_SET(snp_io, &fd_s);
res = select(snp_io + 1, &fd_s, NULL, NULL, NULL);
if (opt_interactive && FD_ISSET(std_in, &fd_s)) {
switch (ch = getchar()) {
if ((res = ioctl(std_in, FIONREAD, &nread)) != 0)
fatal("ioctl() failed.");
if (nread > READB_LEN)
nread = READB_LEN;
if (read(std_in,chb,nread)!=nread)
fatal("read (stdin) failed.");
switch (chb[0]) {
case CHR_CLEAR:
clear();
break;
case CHR_SWITCH:
/* detach_snp(); */
detach_snp();
ask_dev(dev_name, MSG_CHANGE);
set_dev(dev_name);
break;
default:
if (opt_write) {
if (write(snp_io,chb,nread) != nread) {
detach_snp();
ask_dev(dev_name, MSG_NOWRITE);
set_dev(dev_name);
}
}
}
}
if (!FD_ISSET(snp_io, &fd_s))