Refactor main()
- Add arg.h and fix usage Given slock is suid we don't want to have half-measures in place to parse the arguments in case the code is changed in the future with somebody not paying enough attention. Also, fix the usage string output to be more consistent across the suckless toolbase and make it reflect the manpage entry. - Comments Use proper block comments and add/change them where necessary to help in studying the code. - Error messages Consistently prepend them with "slock:" and fix wording and do a proper cleanup before quitting (XCloseDisplay and free the locks), making the die() semantics consistent with st's. - getpwuid() error reporting Properly present an error message if getpwuid() fails. - fork() error reporting Properly present an error message if fork() fails. If we cannot close the connection within the fork context we abort the operation and report an error. - execvp() error handling If execvp fails, we cannot call die() afterwards as this implies calling exit(). We must use _exit() to prevent the libc from doing now "illegal" cleanup-work.
This commit is contained in:
FRIGN
Markus Teich
parent
a7afade170
commit
3bb868e408
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@ -0,0 +1,65 @@
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/*
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* Copy me if you can.
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* by 20h
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*/
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#ifndef ARG_H__
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#define ARG_H__
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extern char *argv0;
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/* use main(int argc, char *argv[]) */
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#define ARGBEGIN for (argv0 = *argv, argv++, argc--;\
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argv[0] && argv[0][0] == '-'\
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&& argv[0][1];\
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argc--, argv++) {\
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char argc_;\
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char **argv_;\
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int brk_;\
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if (argv[0][1] == '-' && argv[0][2] == '\0') {\
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argv++;\
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argc--;\
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break;\
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}\
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for (brk_ = 0, argv[0]++, argv_ = argv;\
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argv[0][0] && !brk_;\
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argv[0]++) {\
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if (argv_ != argv)\
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break;\
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argc_ = argv[0][0];\
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switch (argc_)
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/* Handles obsolete -NUM syntax */
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#define ARGNUM case '0':\
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case '1':\
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case '2':\
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case '3':\
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case '4':\
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case '5':\
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case '6':\
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case '7':\
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case '8':\
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case '9'
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#define ARGEND }\
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}
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#define ARGC() argc_
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#define ARGNUMF() (brk_ = 1, estrtonum(argv[0], 0, INT_MAX))
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#define EARGF(x) ((argv[0][1] == '\0' && argv[1] == NULL)?\
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((x), abort(), (char *)0) :\
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(brk_ = 1, (argv[0][1] != '\0')?\
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(&argv[0][1]) :\
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(argc--, argv++, argv[0])))
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#define ARGF() ((argv[0][1] == '\0' && argv[1] == NULL)?\
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(char *)0 :\
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(brk_ = 1, (argv[0][1] != '\0')?\
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(&argv[0][1]) :\
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(argc--, argv++, argv[0])))
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#define LNGARG() &argv[0][0]
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#endif
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85
slock.c
85
slock.c
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@ -23,8 +23,11 @@
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#include <bsd_auth.h>
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#endif
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#include "arg.h"
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#include "util.h"
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char *argv0;
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enum {
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INIT,
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INPUT,
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@ -54,7 +57,6 @@ die(const char *errstr, ...)
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{
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va_list ap;
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fputs("slock: ", stderr);
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va_start(ap, errstr);
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vfprintf(stderr, errstr, ap);
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va_end(ap);
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@ -280,8 +282,7 @@ lockscreen(Display *dpy, int screen)
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static void
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usage(void)
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{
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fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
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exit(1);
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die("usage: slock [-v | cmd [arg ...]]\n");
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}
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int
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@ -290,64 +291,86 @@ main(int argc, char **argv) {
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const char *pws;
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#endif
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Display *dpy;
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int screen;
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int s, nlocks;
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if ((argc >= 2) && !strcmp("-v", argv[1]))
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die("version %s, © 2006-2016 slock engineers\n", VERSION);
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/* treat first argument starting with a '-' as option */
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if ((argc >= 2) && argv[1][0] == '-')
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ARGBEGIN {
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case 'v':
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fprintf(stderr, "slock-"VERSION"\n");
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return 0;
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default:
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usage();
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} ARGEND
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#ifdef __linux__
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dontkillme();
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#endif
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if (!getpwuid(getuid()))
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die("no passwd entry for you\n");
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/* Check if the current user has a password entry */
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errno = 0;
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if (!getpwuid(getuid())) {
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if (errno == 0)
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die("slock: no password entry for current user\n");
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else
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die("slock: getpwuid: %s\n", strerror(errno));
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}
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#ifndef HAVE_BSD_AUTH
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pws = getpw();
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#endif
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if (!(dpy = XOpenDisplay(0)))
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die("cannot open display\n");
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if (!(dpy = XOpenDisplay(NULL)))
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die("slock: cannot open display\n");
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/* check for Xrandr support */
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rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
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/* Get the number of screens in display "dpy" and blank them all. */
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/* get number of screens in display "dpy" and blank them */
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nscreens = ScreenCount(dpy);
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if (!(locks = malloc(sizeof(Lock*) * nscreens)))
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die("Out of memory.\n");
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int nlocks = 0;
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for (screen = 0; screen < nscreens; screen++) {
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if ((locks[screen] = lockscreen(dpy, screen)) != NULL)
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if (!(locks = malloc(sizeof(Lock *) * nscreens))) {
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XCloseDisplay(dpy);
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die("slock: out of memory\n");
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}
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for (nlocks = 0, s = 0; s < nscreens; s++) {
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if ((locks[s] = lockscreen(dpy, s)) != NULL)
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nlocks++;
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}
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XSync(dpy, False);
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XSync(dpy, 0);
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/* Did we actually manage to lock something? */
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if (nlocks == 0) { /* nothing to protect */
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/* did we actually manage to lock anything? */
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if (nlocks == 0) {
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/* nothing to protect */
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free(locks);
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XCloseDisplay(dpy);
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return 1;
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}
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if (argc >= 2 && fork() == 0) {
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if (dpy)
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close(ConnectionNumber(dpy));
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execvp(argv[1], argv+1);
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die("execvp %s failed: %s\n", argv[1], strerror(errno));
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/* run post-lock command */
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if (argc > 0) {
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switch (fork()) {
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case -1:
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free(locks);
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XCloseDisplay(dpy);
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die("slock: fork failed: %s\n", strerror(errno));
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case 0:
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if (close(ConnectionNumber(dpy)) < 0)
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die("slock: close: %s\n", strerror(errno));
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execvp(argv[0], argv);
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fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
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strerror(errno));
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_exit(1);
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}
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}
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/* Everything is now blank. Now wait for the correct password. */
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/* everything is now blank. Wait for the correct password */
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#ifdef HAVE_BSD_AUTH
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readpw(dpy);
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#else
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readpw(dpy, pws);
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#endif
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/* Password ok, unlock everything and quit. */
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for (screen = 0; screen < nscreens; screen++)
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unlockscreen(dpy, locks[screen]);
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/* password ok, unlock everything and quit */
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for (s = 0; s < nscreens; s++)
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unlockscreen(dpy, locks[s]);
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free(locks);
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XCloseDisplay(dpy);
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