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