diff options
Diffstat (limited to 'usr.bin/at/at.c')
-rw-r--r-- | usr.bin/at/at.c | 562 |
1 files changed, 0 insertions, 562 deletions
diff --git a/usr.bin/at/at.c b/usr.bin/at/at.c deleted file mode 100644 index 53959e3..0000000 --- a/usr.bin/at/at.c +++ /dev/null @@ -1,562 +0,0 @@ -/* - * at.c : Put file into atrun queue - * Copyright (C) 1993 Thomas Koenig - * - * Atrun & Atq modifications - * Copyright (C) 1993 David Parsons - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. The name of the author(s) may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#define _USE_BSD 1 - -/* System Headers */ -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <ctype.h> -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <pwd.h> -#include <signal.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <unistd.h> - -/* Local headers */ -#include "at.h" -#include "panic.h" -#include "parsetime.h" -#include "pathnames.h" -#define MAIN -#include "privs.h" - -/* Macros */ -#define ALARMC 10 /* Number of seconds to wait for timeout */ - -#define SIZE 255 -#define TIMESIZE 50 - -/* File scope variables */ -static char rcsid[] = "$Id: at.c,v 1.2 1993/12/06 04:10:42 cgd Exp $"; -char *no_export[] = -{ - "TERM", "TERMCAP", "DISPLAY", "_" -}; -static send_mail = 0; - -/* External variables */ -extern char **environ; -int fcreated; -char *namep; -char atfile[FILENAME_MAX]; - -char *atinput = (char *) 0; /* where to get input from */ -char atqueue = 0; /* which queue to examine for jobs (atq) */ -char atverify = 0; /* verify time instead of queuing job */ - -/* Function declarations */ -static void sigc __P((int signo)); -static void alarmc __P((int signo)); -static char *cwdname __P((void)); -static void writefile __P((time_t runtimer, char queue)); -static void list_jobs __P((void)); - -/* Signal catching functions */ - -static void -sigc(signo) - int signo; -{ -/* If the user presses ^C, remove the spool file and exit - */ - if (fcreated) { - PRIV_START - unlink(atfile); - PRIV_END - } - - exit(EXIT_FAILURE); -} - -static void -alarmc(signo) - int signo; -{ -/* Time out after some seconds - */ - panic("File locking timed out"); -} - -/* Local functions */ - -static char * -cwdname() -{ -/* Read in the current directory; the name will be overwritten on - * subsequent calls. - */ - static char *ptr = NULL; - static size_t size = SIZE; - - if (ptr == NULL) - ptr = (char *) malloc(size); - - while (1) { - if (ptr == NULL) - panic("Out of memory"); - - if (getcwd(ptr, size - 1) != NULL) - return ptr; - - if (errno != ERANGE) - perr("Cannot get directory"); - - free(ptr); - size += SIZE; - ptr = (char *) malloc(size); - } -} - -static void -writefile(runtimer, queue) - time_t runtimer; - char queue; -{ - /* - * This does most of the work if at or batch are invoked for - * writing a job. - */ - int i; - char *ap, *ppos, *mailname; - struct passwd *pass_entry; - struct stat statbuf; - int fdes, lockdes, fd2; - FILE *fp, *fpin; - struct sigaction act; - char **atenv; - int ch; - mode_t cmask; - struct flock lock; - - /* - * Install the signal handler for SIGINT; terminate after removing the - * spool file if necessary - */ - act.sa_handler = sigc; - sigemptyset(&(act.sa_mask)); - act.sa_flags = 0; - - sigaction(SIGINT, &act, NULL); - - strcpy(atfile, _PATH_ATJOBS); - ppos = atfile + strlen(_PATH_ATJOBS); - - /* - * Loop over all possible file names for running something at this - * particular time, see if a file is there; the first empty slot at - * any particular time is used. Lock the file _PATH_LOCKFILE first - * to make sure we're alone when doing this. - */ - - PRIV_START - - if ((lockdes = open(_PATH_LOCKFILE, O_WRONLY | O_CREAT, 0600)) < 0) - perr2("Cannot open lockfile ", _PATH_LOCKFILE); - - lock.l_type = F_WRLCK; - lock.l_whence = SEEK_SET; - lock.l_start = 0; - lock.l_len = 0; - - act.sa_handler = alarmc; - sigemptyset(&(act.sa_mask)); - act.sa_flags = 0; - - /* - * Set an alarm so a timeout occurs after ALARMC seconds, in case - * something is seriously broken. - */ - sigaction(SIGALRM, &act, NULL); - alarm(ALARMC); - fcntl(lockdes, F_SETLKW, &lock); - alarm(0); - - for (i = 0; i < AT_MAXJOBS; i++) { - sprintf(ppos, "%c%8lx.%3x", queue, - (unsigned long) (runtimer / 60), i); - for (ap = ppos; *ap != '\0'; ap++) - if (*ap == ' ') - *ap = '0'; - - if (stat(atfile, &statbuf) != 0) { - if (errno == ENOENT) - break; - else - perr2("Cannot access ", _PATH_ATJOBS); - } - } /* for */ - - if (i >= AT_MAXJOBS) - panic("Too many jobs already"); - - /* - * Create the file. The x bit is only going to be set after it has - * been completely written out, to make sure it is not executed in - * the meantime. To make sure they do not get deleted, turn off - * their r bit. Yes, this is a kluge. - */ - cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR); - if ((fdes = creat(atfile, O_WRONLY)) == -1) - perr("Cannot create atjob file"); - - if ((fd2 = dup(fdes)) < 0) - perr("Error in dup() of job file"); - - if (fchown(fd2, real_uid, -1) != 0) - perr("Cannot give away file"); - - PRIV_END - - /* - * We no longer need suid root; now we just need to be able to - * write to the directory, if necessary. - */ - - REDUCE_PRIV(0); - - /* - * We've successfully created the file; let's set the flag so it - * gets removed in case of an interrupt or error. - */ - fcreated = 1; - - /* Now we can release the lock, so other people can access it */ - lock.l_type = F_UNLCK; - lock.l_whence = SEEK_SET; - lock.l_start = 0; - lock.l_len = 0; - fcntl(lockdes, F_SETLKW, &lock); - close(lockdes); - - if ((fp = fdopen(fdes, "w")) == NULL) - panic("Cannot reopen atjob file"); - - /* - * Get the userid to mail to, first by trying getlogin(), which - * reads /etc/utmp, then from LOGNAME, finally from getpwuid(). - */ - mailname = getlogin(); - if (mailname == NULL) - mailname = getenv("LOGNAME"); - - if ((mailname == NULL) || (mailname[0] == '\0') - || (strlen(mailname) > 8)) { - pass_entry = getpwuid(getuid()); - if (pass_entry != NULL) - mailname = pass_entry->pw_name; - } - - if (atinput != (char *) NULL) { - fpin = freopen(atinput, "r", stdin); - if (fpin == NULL) - perr("Cannot open input file"); - } - fprintf(fp, "#! /bin/sh\n# mail %8s %d\n", mailname, send_mail); - - /* Write out the umask at the time of invocation */ - fprintf(fp, "umask %lo\n", (unsigned long) cmask); - - /* - * Write out the environment. Anything that may look like a special - * character to the shell is quoted, except for \n, which is done - * with a pair of "'s. Dont't export the no_export list (such as - * TERM or DISPLAY) because we don't want these. - */ - for (atenv = environ; *atenv != NULL; atenv++) { - int export = 1; - char *eqp; - - eqp = strchr(*atenv, '='); - if (ap == NULL) - eqp = *atenv; - else { - int i; - - for (i = 0;i < sizeof(no_export) / - sizeof(no_export[0]); i++) { - export = export - && (strncmp(*atenv, no_export[i], - (size_t) (eqp - *atenv)) != 0); - } - eqp++; - } - - if (export) { - fwrite(*atenv, sizeof(char), eqp - *atenv, fp); - for (ap = eqp; *ap != '\0'; ap++) { - if (*ap == '\n') - fprintf(fp, "\"\n\""); - else { - if (!isalnum(*ap)) - fputc('\\', fp); - - fputc(*ap, fp); - } - } - fputs("; export ", fp); - fwrite(*atenv, sizeof(char), eqp - *atenv - 1, fp); - fputc('\n', fp); - - } - } - /* - * Cd to the directory at the time and write out all the commands - * the user supplies from stdin. - */ - fprintf(fp, "cd %s\n", cwdname()); - - while ((ch = getchar()) != EOF) - fputc(ch, fp); - - fprintf(fp, "\n"); - if (ferror(fp)) - panic("Output error"); - - if (ferror(stdin)) - panic("Input error"); - - fclose(fp); - - /* - * Set the x bit so that we're ready to start executing - */ - if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0) - perr("Cannot give away file"); - - close(fd2); - fprintf(stderr, "Job %s will be executed using /bin/sh\n", ppos); -} - -static void -list_jobs() -{ - /* - * List all a user's jobs in the queue, by looping through - * _PATH_ATJOBS, or everybody's if we are root - */ - struct passwd *pw; - DIR *spool; - struct dirent *dirent; - struct stat buf; - struct tm runtime; - unsigned long ctm; - char queue; - time_t runtimer; - char timestr[TIMESIZE]; - int first = 1; - - PRIV_START - - if (chdir(_PATH_ATJOBS) != 0) - perr2("Cannot change to ", _PATH_ATJOBS); - - if ((spool = opendir(".")) == NULL) - perr2("Cannot open ", _PATH_ATJOBS); - - /* Loop over every file in the directory */ - while ((dirent = readdir(spool)) != NULL) { - if (stat(dirent->d_name, &buf) != 0) - perr2("Cannot stat in ", _PATH_ATJOBS); - - /* - * See it's a regular file and has its x bit turned on and - * is the user's - */ - if (!S_ISREG(buf.st_mode) - || ((buf.st_uid != real_uid) && !(real_uid == 0)) - || !(S_IXUSR & buf.st_mode || atverify)) - continue; - - if (sscanf(dirent->d_name, "%c%8lx", &queue, &ctm) != 2) - continue; - - if (atqueue && (queue != atqueue)) - continue; - - runtimer = 60 * (time_t) ctm; - runtime = *localtime(&runtimer); - strftime(timestr, TIMESIZE, "%X %x", &runtime); - if (first) { - printf("Date\t\t\tOwner\tQueue\tJob#\n"); - first = 0; - } - pw = getpwuid(buf.st_uid); - - printf("%s\t%s\t%c%s\t%s\n", - timestr, - pw ? pw->pw_name : "???", - queue, - (S_IXUSR & buf.st_mode) ? "" : "(done)", - dirent->d_name); - } - PRIV_END -} - -static void -delete_jobs(argc, argv) - int argc; - char **argv; -{ - /* Delete every argument (job - ID) given */ - int i; - struct stat buf; - - PRIV_START - - if (chdir(_PATH_ATJOBS) != 0) - perr2("Cannot change to ", _PATH_ATJOBS); - - for (i = optind; i < argc; i++) { - if (stat(argv[i], &buf) != 0) - perr(argv[i]); - if ((buf.st_uid != real_uid) && !(real_uid == 0)) { - fprintf(stderr, "%s: Not owner\n", argv[i]); - exit(EXIT_FAILURE); - } - if (unlink(argv[i]) != 0) - perr(argv[i]); - } - PRIV_END -} /* delete_jobs */ - -/* Global functions */ - -int -main(argc, argv) - int argc; - char **argv; -{ - int c; - char queue = 'a'; - char *pgm; - - enum { - ATQ, ATRM, AT, BATCH - }; /* what program we want to run */ - int program = AT; /* our default program */ - char *options = "q:f:mv"; /* default options for at */ - time_t timer; - - RELINQUISH_PRIVS - - /* Eat any leading paths */ - if ((pgm = strrchr(argv[0], '/')) == NULL) - pgm = argv[0]; - else - pgm++; - - namep = pgm; - - /* find out what this program is supposed to do */ - if (strcmp(pgm, "atq") == 0) { - program = ATQ; - options = "q:v"; - } else if (strcmp(pgm, "atrm") == 0) { - program = ATRM; - options = ""; - } else if (strcmp(pgm, "batch") == 0) { - program = BATCH; - options = "f:mv"; - } - - /* process whatever options we can process */ - opterr = 1; - while ((c = getopt(argc, argv, options)) != EOF) - switch (c) { - case 'v': /* verify time settings */ - atverify = 1; - break; - - case 'm': /* send mail when job is complete */ - send_mail = 1; - break; - - case 'f': - atinput = optarg; - break; - - case 'q': /* specify queue */ - if (strlen(optarg) > 1) - usage(); - - atqueue = queue = *optarg; - if ((!islower(queue)) || (queue > 'l')) - usage(); - break; - - default: - usage(); - break; - } - /* end of options eating */ - - /* select our program */ - switch (program) { - case ATQ: - - REDUCE_PRIV(0); - - list_jobs(); - break; - - case ATRM: - - REDUCE_PRIV(0); - - delete_jobs(argc, argv); - break; - - case AT: - timer = parsetime(argc, argv); - if (atverify) { - struct tm *tm = localtime(&timer); - - fprintf(stderr, "%s\n", asctime(tm)); - } - writefile(timer, queue); - break; - - case BATCH: - writefile(time(NULL), 'b'); - break; - - default: - panic("Internal error"); - break; - } - exit(EXIT_SUCCESS); -} |