ref: b86a12149ade500326a238753c31b6e0178d3b5b
dir: /sys/src/cmd/screenlock.c/
/* screenlock - lock a terminal */
#include <u.h>
#include <libc.h>
#include <libsec.h>
#include <draw.h>
#include <thread.h>
#include <auth.h>
char pic[] = "/lib/bunny.bit";
int vgactl;
int debug;
int doblank;
int chatty = 0;
char user[256];
void
blankscreen(int blank)
{
if(vgactl < 0)
return;
seek(vgactl, 0, 0);
if(fprint(vgactl, blank? "blank": "unblank") < 0)
fprint(2, "blankscreen: can't blank: %r\n");
}
void
error(char *fmt, ...)
{
Fmt f;
char buf[64];
va_list arg;
fmtfdinit(&f, 1, buf, sizeof buf);
fmtprint(&f, "screenlock: ");
va_start(arg, fmt);
fmtvprint(&f, fmt, arg);
va_end(arg);
fmtprint(&f, "\n");
fmtfdflush(&f);
threadexitsall("fatal error");
}
void
usage(void)
{
fprint(2, "usage: %s\n", argv0);
exits("usage");
}
void
readfile(char *name, char *buf, int nbuf, int addnul)
{
int fd;
fd = open(name, OREAD);
if(fd == -1)
error("%s - can't open: %r", name);
nbuf = read(fd, buf, nbuf-addnul);
close(fd);
if(nbuf == -1)
error("%s - can't can't read: %r", name);
if(addnul)
buf[nbuf] = '\0';
}
void
readline(char *buf, int nbuf)
{
char c;
int i;
i = 0;
while(i < nbuf-1)
if(read(0, &c, 1) != 1 || c == '\04' || c == '\177'){
i = 0;
break;
} else if(c == '\n')
break;
else if(c == '\b' && i > 0)
--i;
else if(c == ('u' & 037))
i = 0;
else
buf[i++] = c;
buf[i] = '\0';
}
void
checkpassword(void)
{
int fd, consctl, must;
char buf[256];
AuthInfo *ai;
static int opened;
must = 1;
if(!opened){
fd = open("/dev/cons", OREAD);
if(fd == -1)
error("can't open cons: %r");
dup(fd, 0);
close(fd);
fd = open("/dev/cons", OWRITE);
if(fd == -1)
error("can't open cons: %r");
dup(fd, 1);
dup(1, 2);
close(fd);
consctl = open("/dev/consctl", OWRITE);
if(consctl == -1)
error("can't open consctl: %r");
if(write(consctl, "rawon", 5) != 5)
error("can't turn off echo\n");
opened = 1;
}
for(;;){
if(chatty || !must)
fprint(2, "%s's screenlock password: ", user);
memset(buf, 0, sizeof buf);
readline(buf, sizeof buf);
blankscreen(0);
if(chatty || !must)
fprint(2, "\n");
if(buf[0] == '\0' || buf[0] == '\04'){
if(must)
continue;
error("no password typed");
}
/* authenticate */
ai = auth_userpasswd(user, buf);
if(ai != nil && ai->cap != nil)
break;
auth_freeAI(ai);
if(chatty || !must)
fprint(2, "password mismatch\n");
doblank = 1;
}
memset(buf, 0, sizeof buf);
blankscreen(0);
}
void
blanker(void *)
{
int tics;
tics = 0;
for(;;){
if(doblank > 0){
doblank = 0;
tics = 10;
}
if(tics > 0 && --tics == 0)
blankscreen(1);
sleep(1000);
}
}
void
grabmouse(void*)
{
int fd, x, y;
char ibuf[256], obuf[256];
if(debug)
return;
fd = open("/dev/mouse", ORDWR);
if(fd < 0)
error("can't open /dev/mouse: %r");
snprint(obuf, sizeof obuf, "m %d %d",
screen->r.min.x + Dx(screen->r)/2,
screen->r.min.y + Dy(screen->r)/2);
while(read(fd, ibuf, sizeof ibuf) > 0){
ibuf[12] = 0;
ibuf[24] = 0;
x = atoi(ibuf+1);
y = atoi(ibuf+13);
if(x != screen->r.min.x + Dx(screen->r)/2 ||
y != screen->r.min.y + Dy(screen->r)/2){
fprint(fd, "%s", obuf);
doblank = 1;
}
}
}
/* lay down text at `p' */
static void
screenstring(Point p, char *s)
{
string(screen, p, screen->display->white, ZP, font, s);
flushimage(display, 1);
}
void
lockscreen(void)
{
enum { Nfld = 5, Fldlen = 12, Cursorlen = 2*4 + 2*2*16, };
char *s;
char buf[Nfld*Fldlen], *flds[Nfld], newcmd[128], cbuf[Cursorlen];
int fd, dx, dy;
Image *i;
Point p;
Rectangle r;
Tm *tm;
fd = open("/dev/screen", OREAD);
if(fd < 0)
error("can't open /dev/screen: %r");
if(read(fd, buf, Nfld*Fldlen) != Nfld*Fldlen)
error("can't read /dev/screen: %r");
close(fd);
buf[sizeof buf-1] = 0;
if(tokenize(buf, flds, Nfld) != Nfld)
error("can't tokenize /dev/screen header");
snprint(newcmd, sizeof newcmd, "-r %s %s %d %d",
flds[1], flds[2], atoi(flds[3]) - 1, atoi(flds[4]) - 1);
newwindow(newcmd);
if (initdraw(nil, nil, "screenlock") < 0)
sysfatal("initdraw failed");
if(display == nil)
error("no display");
/* screen is now open and covered. grab mouse and hold on tight */
procrfork(grabmouse, nil, 4096, RFFDG);
procrfork(blanker, nil, 4096, RFFDG);
fd = open(pic, OREAD);
if(fd > 0){
i = readimage(display, fd, 0);
if(i){
r = screen->r;
p = Pt(r.max.x / 2, r.max.y * 2 / 3);
dx = (Dx(screen->r) - Dx(i->r)) / 2;
r.min.x += dx;
r.max.x -= dx;
dy = (Dy(screen->r) - Dy(i->r)) / 2;
r.min.y += dy;
r.max.y -= dy;
draw(screen, screen->r, display->black, nil, ZP);
draw(screen, r, i, nil, i->r.min);
flushimage(display, 1);
}
close(fd);
/* identify the user on screen, centered */
tm = localtime(time(0));
s = smprint("user %s at %d:%02.2d", getuser(), tm->hour, tm->min);
p = subpt(p, Pt(stringwidth(font, "m") * strlen(s) / 2, 0));
screenstring(p, s);
}
/* clear the cursor */
fd = open("/dev/cursor", OWRITE);
if(fd > 0){
memset(cbuf, 0, sizeof cbuf);
write(fd, cbuf, sizeof cbuf);
/* leave it open */
}
}
void
threadmain(int argc, char *argv[])
{
readfile("#c/user", user, sizeof user, 1);
if((vgactl = open("/dev/vgactl", OWRITE)) < 0)
vgactl = open("#v/vgactl", OWRITE);
ARGBEGIN{
case 'd':
debug++;
break;
default:
usage();
}ARGEND
if(argc != 0)
usage();
doblank = 1;
lockscreen();
checkpassword();
threadexitsall(nil);
}