da80d2d49d
another process already has /dev/snp0 open, the snp(4) will return EBUSY, in which case watch will try to open /dev/snp1..9. Currently watch does not check errno to see if the failure was a result of EBUSY. This results in watch making futile attempts to open snp0..snp9 even though devices may not exist or the caller does not have permissions to access the device. In addition to this, it attempts to setup the screen for snooping even though it may not ever get an snp device. So this patch does two things 1) Checks errno for EBUSY, if open(2) fails for another reason print that reason and exit. 2) setup the terminal for snooping after the snp descriptor has been obtained. Approved by: bmilekic (mentor)
447 lines
8.9 KiB
C
447 lines
8.9 KiB
C
/*
|
|
* Copyright (c) 1995 Ugen J.S.Antsilevich
|
|
*
|
|
* Redistribution and use in source forms, with and without modification,
|
|
* are permitted provided that this entire comment appears intact.
|
|
*
|
|
* Redistribution in binary form may occur without any restrictions.
|
|
* Obviously, it would be nice if you gave credit where credit is due
|
|
* but requiring it would be too onerous.
|
|
*
|
|
* This software is provided ``AS IS'' without any warranties of any kind.
|
|
*
|
|
* Snoop stuff.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/snoop.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/linker.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <locale.h>
|
|
#include <paths.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sysexits.h>
|
|
#include <termcap.h>
|
|
#include <termios.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#define MSG_INIT "Snoop started."
|
|
#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++ */
|
|
#define MIN_SIZE 256
|
|
|
|
#define CHR_SWITCH 24 /* Ctrl+X */
|
|
#define CHR_CLEAR 23 /* Ctrl+V */
|
|
|
|
static void clear(void);
|
|
static void timestamp(const char *);
|
|
static void set_tty(void);
|
|
static void unset_tty(void);
|
|
static void fatal(int, const char *);
|
|
static int open_snp(void);
|
|
static void cleanup(int);
|
|
static void usage(void) __dead2;
|
|
static void setup_scr(void);
|
|
static void attach_snp(void);
|
|
static void detach_snp(void);
|
|
static void set_dev(const char *);
|
|
static void ask_dev(char *, const char *);
|
|
|
|
int opt_reconn_close = 0;
|
|
int opt_reconn_oflow = 0;
|
|
int opt_interactive = 1;
|
|
int opt_timestamp = 0;
|
|
int opt_write = 0;
|
|
int opt_no_switch = 0;
|
|
const char *opt_snpdev;
|
|
|
|
char dev_name[DEV_NAME_LEN];
|
|
int snp_io;
|
|
dev_t snp_tty;
|
|
int std_in = 0, std_out = 1;
|
|
|
|
|
|
int clear_ok = 0;
|
|
struct termios otty;
|
|
char tbuf[1024], gbuf[1024];
|
|
|
|
|
|
static void
|
|
clear(void)
|
|
{
|
|
if (clear_ok)
|
|
tputs(gbuf, 1, putchar);
|
|
fflush(stdout);
|
|
}
|
|
|
|
static void
|
|
timestamp(const char *buf)
|
|
{
|
|
time_t t;
|
|
char btmp[1024];
|
|
clear();
|
|
printf("\n---------------------------------------------\n");
|
|
t = time(NULL);
|
|
strftime(btmp, 1024, "Time: %d %b %H:%M", localtime(&t));
|
|
printf("%s\n", btmp);
|
|
printf("%s\n", buf);
|
|
printf("---------------------------------------------\n");
|
|
fflush(stdout);
|
|
}
|
|
|
|
static void
|
|
set_tty(void)
|
|
{
|
|
struct termios ntty;
|
|
|
|
tcgetattr (std_in, &otty);
|
|
ntty = otty;
|
|
ntty.c_lflag &= ~ICANON; /* disable canonical operation */
|
|
ntty.c_lflag &= ~ECHO;
|
|
#ifdef FLUSHO
|
|
ntty.c_lflag &= ~FLUSHO;
|
|
#endif
|
|
#ifdef PENDIN
|
|
ntty.c_lflag &= ~PENDIN;
|
|
#endif
|
|
#ifdef IEXTEN
|
|
ntty.c_lflag &= ~IEXTEN;
|
|
#endif
|
|
ntty.c_cc[VMIN] = 1; /* minimum of one character */
|
|
ntty.c_cc[VTIME] = 0; /* timeout value */
|
|
|
|
ntty.c_cc[VINTR] = 07; /* ^G */
|
|
ntty.c_cc[VQUIT] = 07; /* ^G */
|
|
tcsetattr (std_in, TCSANOW, &ntty);
|
|
}
|
|
|
|
static void
|
|
unset_tty(void)
|
|
{
|
|
tcsetattr (std_in, TCSANOW, &otty);
|
|
}
|
|
|
|
|
|
static void
|
|
fatal(int error, const char *buf)
|
|
{
|
|
unset_tty();
|
|
if (buf)
|
|
errx(error, "fatal: %s", buf);
|
|
else
|
|
exit(error);
|
|
}
|
|
|
|
static int
|
|
open_snp(void)
|
|
{
|
|
char snp[] = {_PATH_DEV "snpX"};
|
|
char c;
|
|
int f, mode, pos;
|
|
|
|
pos = strlen(snp) - 1;
|
|
if (opt_write)
|
|
mode = O_RDWR;
|
|
else
|
|
mode = O_RDONLY;
|
|
|
|
if (opt_snpdev == NULL)
|
|
for (c = '0'; c <= '9'; c++) {
|
|
snp[pos] = c;
|
|
if ((f = open(snp, mode)) < 0) {
|
|
if (errno == EBUSY)
|
|
continue;
|
|
err(1, "open %s", snp);
|
|
}
|
|
return f;
|
|
}
|
|
else
|
|
if ((f = open(opt_snpdev, mode)) != -1)
|
|
return (f);
|
|
fatal(EX_OSFILE, "cannot open snoop device");
|
|
return (0);
|
|
}
|
|
|
|
|
|
static void
|
|
cleanup(int signo __unused)
|
|
{
|
|
if (opt_timestamp)
|
|
timestamp("Logging Exited.");
|
|
close(snp_io);
|
|
unset_tty();
|
|
exit(EX_OK);
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "usage: watch [-ciotnW] [tty name]\n");
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
static void
|
|
setup_scr(void)
|
|
{
|
|
char *cbuf = gbuf, *term;
|
|
if (!opt_interactive)
|
|
return;
|
|
if ((term = getenv("TERM")))
|
|
if (tgetent(tbuf, term) == 1)
|
|
if (tgetstr("cl", &cbuf))
|
|
clear_ok = 1;
|
|
set_tty();
|
|
clear();
|
|
}
|
|
|
|
static void
|
|
detach_snp(void)
|
|
{
|
|
dev_t dev;
|
|
|
|
dev = NODEV;
|
|
ioctl(snp_io, SNPSTTY, &dev);
|
|
}
|
|
|
|
static void
|
|
attach_snp(void)
|
|
{
|
|
if (ioctl(snp_io, SNPSTTY, &snp_tty) != 0)
|
|
fatal(EX_UNAVAILABLE, "cannot attach to tty");
|
|
if (opt_timestamp)
|
|
timestamp("Logging Started.");
|
|
}
|
|
|
|
|
|
static void
|
|
set_dev(const char *name)
|
|
{
|
|
char buf[DEV_NAME_LEN];
|
|
struct stat sb;
|
|
|
|
if (strlen(name) > 5 && !strncmp(name, _PATH_DEV, sizeof _PATH_DEV - 1)) {
|
|
snprintf(buf, sizeof buf, "%s", name);
|
|
} else {
|
|
if (strlen(name) == 2)
|
|
sprintf(buf, "%s%s", _PATH_TTY, name);
|
|
else
|
|
sprintf(buf, "%s%s", _PATH_DEV, name);
|
|
}
|
|
|
|
if (*name == '\0' || stat(buf, &sb) < 0)
|
|
fatal(EX_DATAERR, "bad device name");
|
|
|
|
if ((sb.st_mode & S_IFMT) != S_IFCHR)
|
|
fatal(EX_DATAERR, "must be a character device");
|
|
|
|
snp_tty = sb.st_rdev;
|
|
attach_snp();
|
|
}
|
|
|
|
void
|
|
ask_dev(char *dbuf, const char *msg)
|
|
{
|
|
char buf[DEV_NAME_LEN];
|
|
int len;
|
|
|
|
clear();
|
|
unset_tty();
|
|
|
|
if (msg)
|
|
printf("%s\n", msg);
|
|
if (dbuf)
|
|
printf("Enter device name [%s]:", dbuf);
|
|
else
|
|
printf("Enter device name:");
|
|
|
|
if (fgets(buf, DEV_NAME_LEN - 1, stdin)) {
|
|
len = strlen(buf);
|
|
if (buf[len - 1] == '\n')
|
|
buf[len - 1] = '\0';
|
|
if (buf[0] != '\0' && buf[0] != ' ')
|
|
strcpy(dbuf, buf);
|
|
}
|
|
set_tty();
|
|
}
|
|
|
|
#define READB_LEN 5
|
|
|
|
int
|
|
main(int ac, char *av[])
|
|
{
|
|
int ch, res, rv, nread;
|
|
size_t b_size = MIN_SIZE;
|
|
char *buf, chb[READB_LEN];
|
|
fd_set fd_s;
|
|
|
|
(void) setlocale(LC_TIME, "");
|
|
|
|
if (isatty(std_out))
|
|
opt_interactive = 1;
|
|
else
|
|
opt_interactive = 0;
|
|
|
|
|
|
while ((ch = getopt(ac, av, "Wciotnf:")) != -1)
|
|
switch (ch) {
|
|
case 'W':
|
|
opt_write = 1;
|
|
break;
|
|
case 'c':
|
|
opt_reconn_close = 1;
|
|
break;
|
|
case 'i':
|
|
opt_interactive = 1;
|
|
break;
|
|
case 'o':
|
|
opt_reconn_oflow = 1;
|
|
break;
|
|
case 't':
|
|
opt_timestamp = 1;
|
|
break;
|
|
case 'n':
|
|
opt_no_switch = 1;
|
|
break;
|
|
case 'f':
|
|
opt_snpdev = optarg;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
if (modfind("snp") == -1)
|
|
if (kldload("snp") == -1 || modfind("snp") == -1)
|
|
warn("snp module not available");
|
|
|
|
signal(SIGINT, cleanup);
|
|
|
|
snp_io = open_snp();
|
|
setup_scr();
|
|
|
|
if (*(av += optind) == NULL) {
|
|
if (opt_interactive && !opt_no_switch)
|
|
ask_dev(dev_name, MSG_INIT);
|
|
else
|
|
fatal(EX_DATAERR, "no device name given");
|
|
} else
|
|
strncpy(dev_name, *av, DEV_NAME_LEN);
|
|
|
|
set_dev(dev_name);
|
|
|
|
if (!(buf = (char *) malloc(b_size)))
|
|
fatal(EX_UNAVAILABLE, "malloc failed");
|
|
|
|
FD_ZERO(&fd_s);
|
|
|
|
while (1) {
|
|
if (opt_interactive)
|
|
FD_SET(std_in, &fd_s);
|
|
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)) {
|
|
|
|
if ((res = ioctl(std_in, FIONREAD, &nread)) != 0)
|
|
fatal(EX_OSERR, "ioctl(FIONREAD)");
|
|
if (nread > READB_LEN)
|
|
nread = READB_LEN;
|
|
rv = read(std_in, chb, nread);
|
|
if (rv == -1 || rv != nread)
|
|
fatal(EX_IOERR, "read (stdin) failed");
|
|
|
|
switch (chb[0]) {
|
|
case CHR_CLEAR:
|
|
clear();
|
|
break;
|
|
case CHR_SWITCH:
|
|
if (!opt_no_switch) {
|
|
detach_snp();
|
|
ask_dev(dev_name, MSG_CHANGE);
|
|
set_dev(dev_name);
|
|
break;
|
|
}
|
|
default:
|
|
if (opt_write) {
|
|
rv = write(snp_io, chb, nread);
|
|
if (rv == -1 || rv != nread) {
|
|
detach_snp();
|
|
if (opt_no_switch)
|
|
fatal(EX_IOERR,
|
|
"write failed");
|
|
ask_dev(dev_name, MSG_NOWRITE);
|
|
set_dev(dev_name);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
if (!FD_ISSET(snp_io, &fd_s))
|
|
continue;
|
|
|
|
if ((res = ioctl(snp_io, FIONREAD, &nread)) != 0)
|
|
fatal(EX_OSERR, "ioctl(FIONREAD)");
|
|
|
|
switch (nread) {
|
|
case SNP_OFLOW:
|
|
if (opt_reconn_oflow)
|
|
attach_snp();
|
|
else if (opt_interactive && !opt_no_switch) {
|
|
ask_dev(dev_name, MSG_OFLOW);
|
|
set_dev(dev_name);
|
|
} else
|
|
cleanup(-1);
|
|
break;
|
|
case SNP_DETACH:
|
|
case SNP_TTYCLOSE:
|
|
if (opt_reconn_close)
|
|
attach_snp();
|
|
else if (opt_interactive && !opt_no_switch) {
|
|
ask_dev(dev_name, MSG_CLOSED);
|
|
set_dev(dev_name);
|
|
} else
|
|
cleanup(-1);
|
|
break;
|
|
default:
|
|
if (nread < (b_size / 2) && (b_size / 2) > MIN_SIZE) {
|
|
free(buf);
|
|
if (!(buf = (char *) malloc(b_size / 2)))
|
|
fatal(EX_UNAVAILABLE, "malloc failed");
|
|
b_size = b_size / 2;
|
|
}
|
|
if (nread > b_size) {
|
|
b_size = (nread % 2) ? (nread + 1) : (nread);
|
|
free(buf);
|
|
if (!(buf = (char *) malloc(b_size)))
|
|
fatal(EX_UNAVAILABLE, "malloc failed");
|
|
}
|
|
rv = read(snp_io, buf, nread);
|
|
if (rv == -1 || rv != nread)
|
|
fatal(EX_IOERR, "read failed");
|
|
rv = write(std_out, buf, nread);
|
|
if (rv == -1 || rv != nread)
|
|
fatal(EX_IOERR, "write failed");
|
|
}
|
|
} /* While */
|
|
return(0);
|
|
}
|
|
|