diff options
Diffstat (limited to 'src/rc/broadcast.c')
| -rw-r--r-- | src/rc/broadcast.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/src/rc/broadcast.c b/src/rc/broadcast.c deleted file mode 100644 index 402a9fb9..00000000 --- a/src/rc/broadcast.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * broadcast.c - * broadcast a message to every logged in user - */ - -/* - * Copyright 2018 Sony Interactive Entertainment Inc. - * - * This file is part of OpenRC. It is subject to the license terms in - * the LICENSE file found in the top-level directory of this - * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE - * This file may not be copied, modified, propagated, or distributed - * except according to the terms contained in the LICENSE file. - */ -#include <ctype.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/sysmacros.h> -#include <limits.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <unistd.h> -#include <stdio.h> -#include <utmp.h> -#include <utmpx.h> -#include <pwd.h> -#include <fcntl.h> -#include <signal.h> -#include <setjmp.h> -#include <paths.h> -#include <sys/utsname.h> - -#include "broadcast.h" -#include "helpers.h" - -#ifndef _PATH_DEV -# define _PATH_DEV "/dev/" -#endif - -static sigjmp_buf jbuf; - -/* - * Alarm handler - */ -/*ARGSUSED*/ -# ifdef __GNUC__ -static void handler(int arg __attribute__((unused))) -# else -static void handler(int arg) -# endif -{ - siglongjmp(jbuf, 1); -} - -static void getuidtty(char **userp, char **ttyp) -{ - struct passwd *pwd; - uid_t uid; - char *tty; - static char uidbuf[32]; - char *ttynm = NULL; - - uid = getuid(); - if ((pwd = getpwuid(uid)) != NULL) { - uidbuf[0] = 0; - strncat(uidbuf, pwd->pw_name, sizeof(uidbuf) - 1); - } else { - if (uid) - sprintf(uidbuf, "uid %d", (int) uid); - else - sprintf(uidbuf, "root"); - } - - if ((tty = ttyname(0)) != NULL) { - const size_t plen = strlen(_PATH_DEV); - if (strncmp(tty, _PATH_DEV, plen) == 0) { - tty += plen; - if (tty[0] == '/') - tty++; - } - xasprintf(&ttynm, "(%s) ", tty); - } - - *userp = uidbuf; - *ttyp = ttynm; -} - -/* - * Check whether the given filename looks like a tty device. - */ -static int file_isatty(const char *fname) -{ - struct stat st; - int major; - - if (stat(fname, &st) < 0) - return 0; - - if (st.st_nlink != 1 || !S_ISCHR(st.st_mode)) - return 0; - - /* - * It would be an impossible task to list all major/minors - * of tty devices here, so we just exclude the obvious - * majors of which just opening has side-effects: - * printers and tapes. - */ - major = major(st.st_dev); - if (major == 1 || major == 2 || major == 6 || major == 9 || - major == 12 || major == 16 || major == 21 || major == 27 || - major == 37 || major == 96 || major == 97 || major == 206 || - major == 230) - return 0; - return 1; -} - -/* - * broadcast function. - * - * NB: Not multithread safe. - */ -void broadcast(char *text) -{ - char *tty; - char *user; - struct utsname name; - time_t t; - char *date; - char *p; - char *line = NULL; - struct sigaction sa; - int flags; - char *term = NULL; - struct utmpx *utmp; - /* - * These are set across the sigsetjmp call, so they can't be stored on - * the stack, otherwise they might be clobbered. - */ - static int fd; - static FILE *tp; - - getuidtty(&user, &tty); - - /* - * Get and report current hostname, to make it easier to find out - * which machine is being shut down. - */ - uname(&name); - - /* Get the time */ - time(&t); - date = ctime(&t); - p = strchr(date, '\n'); - if (p) - *p = 0; - - xasprintf(&line, "\007\r\nBroadcast message from %s@%s %s(%s):\r\n\r\n", - user, name.nodename, tty, date); - free(tty); - - /* - * Fork to avoid hanging in a write() - */ - if (fork() != 0) - return; - - memset(&sa, 0, sizeof(sa)); - sa.sa_handler = handler; - sigemptyset(&sa.sa_mask); - sigaction(SIGALRM, &sa, NULL); - - setutxent(); - - while ((utmp = getutxent()) != NULL) { - if (utmp->ut_type != USER_PROCESS || utmp->ut_user[0] == 0) - continue; - if (strncmp(utmp->ut_line, _PATH_DEV, strlen(_PATH_DEV)) == 0) - xasprintf(&term, "%s", utmp->ut_line); - else - xasprintf(&term, "%s%s", _PATH_DEV, utmp->ut_line); - if (strstr(term, "/../")) { - free(term); - continue; - } - - /* - * Open it non-delay - */ - if (sigsetjmp(jbuf, 1) == 0) { - alarm(2); - flags = O_WRONLY|O_NDELAY|O_NOCTTY; - if (file_isatty(term) && (fd = open(term, flags)) >= 0) { - if (isatty(fd) && (tp = fdopen(fd, "w")) != NULL) { - fputs(line, tp); - fputs(text, tp); - fflush(tp); - } - } - } - alarm(0); - if (fd >= 0) - close(fd); - if (tp != NULL) - fclose(tp); - free(term); - } - endutxent(); - free(line); - exit(0); -} |