source: MondoRescue/branches/stable/mindi-busybox/miscutils/crontab.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 12 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 6.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * CRONTAB
4 *
5 * usually setuid root, -c option only works if getuid() == geteuid()
6 *
7 * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
8 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
9 *
10 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
11 */
12
13#include "libbb.h"
14
15#ifndef CRONTABS
16#define CRONTABS        "/var/spool/cron/crontabs"
17#endif
18#ifndef TMPDIR
19#define TMPDIR          "/var/spool/cron"
20#endif
21#ifndef CRONUPDATE
22#define CRONUPDATE      "cron.update"
23#endif
24#ifndef PATH_VI
25#define PATH_VI         "/bin/vi"   /* location of vi */
26#endif
27
28static const char *CDir = CRONTABS;
29
30static void EditFile(const char *user, const char *file);
31static int GetReplaceStream(const char *user, const char *file);
32static int ChangeUser(const char *user, short dochdir);
33
34int crontab_main(int ac, char **av);
35int crontab_main(int ac, char **av)
36{
37    enum { NONE, EDIT, LIST, REPLACE, DELETE } option = NONE;
38    const struct passwd *pas;
39    const char *repFile = NULL;
40    int repFd = 0;
41    int i;
42    char caller[256];           /* user that ran program */
43    char buf[1024];
44    int UserId;
45
46    UserId = getuid();
47    pas = getpwuid(UserId);
48    if (pas == NULL)
49        bb_perror_msg_and_die("getpwuid");
50
51    safe_strncpy(caller, pas->pw_name, sizeof(caller));
52
53    i = 1;
54    if (ac > 1) {
55        if (LONE_DASH(av[1])) {
56            option = REPLACE;
57            ++i;
58        } else if (av[1][0] != '-') {
59            option = REPLACE;
60            ++i;
61            repFile = av[1];
62        }
63    }
64
65    for (; i < ac; ++i) {
66        char *ptr = av[i];
67
68        if (*ptr != '-')
69            break;
70        ptr += 2;
71
72        switch (ptr[-1]) {
73        case 'l':
74            if (ptr[-1] == 'l')
75                option = LIST;
76            /* fall through */
77        case 'e':
78            if (ptr[-1] == 'e')
79                option = EDIT;
80            /* fall through */
81        case 'd':
82            if (ptr[-1] == 'd')
83                option = DELETE;
84            /* fall through */
85        case 'u':
86            if (i + 1 < ac && av[i+1][0] != '-') {
87                ++i;
88                if (getuid() == geteuid()) {
89                    pas = getpwnam(av[i]);
90                    if (pas) {
91                        UserId = pas->pw_uid;
92                    } else {
93                        bb_error_msg_and_die("user %s unknown", av[i]);
94                    }
95                } else {
96                    bb_error_msg_and_die("only the superuser may specify a user");
97                }
98            }
99            break;
100        case 'c':
101            if (getuid() == geteuid()) {
102                CDir = (*ptr) ? ptr : av[++i];
103            } else {
104                bb_error_msg_and_die("-c option: superuser only");
105            }
106            break;
107        default:
108            i = ac;
109            break;
110        }
111    }
112    if (i != ac || option == NONE)
113        bb_show_usage();
114
115    /*
116     * Get password entry
117     */
118
119    pas = getpwuid(UserId);
120    if (pas == NULL)
121        bb_perror_msg_and_die("getpwuid");
122
123    /*
124     * If there is a replacement file, obtain a secure descriptor to it.
125     */
126
127    if (repFile) {
128        repFd = GetReplaceStream(caller, repFile);
129        if (repFd < 0)
130            bb_error_msg_and_die("cannot read replacement file");
131    }
132
133    /*
134     * Change directory to our crontab directory
135     */
136
137    xchdir(CDir);
138
139    /*
140     * Handle options as appropriate
141     */
142
143    switch (option) {
144    case LIST:
145        {
146            FILE *fi;
147
148            fi = fopen(pas->pw_name, "r");
149            if (fi) {
150                while (fgets(buf, sizeof(buf), fi) != NULL)
151                    fputs(buf, stdout);
152                fclose(fi);
153            } else {
154                bb_error_msg("no crontab for %s", pas->pw_name);
155            }
156        }
157        break;
158    case EDIT:
159        {
160/* FIXME: messy code here! we have file copying helpers for this! */
161            FILE *fi;
162            int fd;
163            int n;
164            char tmp[128];
165
166            snprintf(tmp, sizeof(tmp), TMPDIR "/crontab.%d", getpid());
167            fd = xopen3(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600);
168/* race, use fchown */
169            chown(tmp, getuid(), getgid());
170            fi = fopen(pas->pw_name, "r");
171            if (fi) {
172                while ((n = fread(buf, 1, sizeof(buf), fi)) > 0)
173                    full_write(fd, buf, n);
174            }
175            EditFile(caller, tmp);
176            remove(tmp);
177            lseek(fd, 0L, SEEK_SET);
178            repFd = fd;
179        }
180        option = REPLACE;
181        /* fall through */
182    case REPLACE:
183        {
184/* same here */
185            char path[1024];
186            int fd;
187            int n;
188
189            snprintf(path, sizeof(path), "%s.new", pas->pw_name);
190            fd = open(path, O_CREAT|O_TRUNC|O_APPEND|O_WRONLY, 0600);
191            if (fd >= 0) {
192                while ((n = read(repFd, buf, sizeof(buf))) > 0) {
193                    full_write(fd, buf, n);
194                }
195                close(fd);
196                rename(path, pas->pw_name);
197            } else {
198                bb_error_msg("cannot create %s/%s", CDir, path);
199            }
200            close(repFd);
201        }
202        break;
203    case DELETE:
204        remove(pas->pw_name);
205        break;
206    case NONE:
207    default:
208        break;
209    }
210
211    /*
212     *  Bump notification file.  Handle window where crond picks file up
213     *  before we can write our entry out.
214     */
215
216    if (option == REPLACE || option == DELETE) {
217        FILE *fo;
218        struct stat st;
219
220        while ((fo = fopen(CRONUPDATE, "a"))) {
221            fprintf(fo, "%s\n", pas->pw_name);
222            fflush(fo);
223            if (fstat(fileno(fo), &st) != 0 || st.st_nlink != 0) {
224                fclose(fo);
225                break;
226            }
227            fclose(fo);
228            /* loop */
229        }
230        if (fo == NULL) {
231            bb_error_msg("cannot append to %s/%s", CDir, CRONUPDATE);
232        }
233    }
234    return 0;
235}
236
237static int GetReplaceStream(const char *user, const char *file)
238{
239    int filedes[2];
240    int pid;
241    int fd;
242    int n;
243    char buf[1024];
244
245    if (pipe(filedes) < 0) {
246        perror("pipe");
247        return -1;
248    }
249    pid = fork();
250    if (pid < 0) {
251        perror("fork");
252        return -1;
253    }
254    if (pid > 0) {
255        /*
256         * PARENT
257         */
258
259        close(filedes[1]);
260        if (read(filedes[0], buf, 1) != 1) {
261            close(filedes[0]);
262            filedes[0] = -1;
263        }
264        return filedes[0];
265    }
266
267    /*
268     * CHILD
269     */
270
271    close(filedes[0]);
272
273    if (ChangeUser(user, 0) < 0)
274        exit(0);
275
276    xfunc_error_retval = 0;
277    fd = xopen(file, O_RDONLY);
278    buf[0] = 0;
279    write(filedes[1], buf, 1);
280    while ((n = read(fd, buf, sizeof(buf))) > 0) {
281        write(filedes[1], buf, n);
282    }
283    exit(0);
284}
285
286static void EditFile(const char *user, const char *file)
287{
288    int pid = fork();
289
290    if (pid == 0) {
291        /*
292         * CHILD - change user and run editor
293         */
294        const char *ptr;
295
296        if (ChangeUser(user, 1) < 0)
297            exit(0);
298        ptr = getenv("VISUAL");
299        if (ptr == NULL)
300            ptr = getenv("EDITOR");
301        if (ptr == NULL)
302            ptr = PATH_VI;
303
304        ptr = xasprintf("%s %s", ptr, file);
305        execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", ptr, NULL);
306        bb_perror_msg_and_die("exec");
307    }
308    if (pid < 0) {
309        /*
310         * PARENT - failure
311         */
312        bb_perror_msg_and_die("fork");
313    }
314    wait4(pid, NULL, 0, NULL);
315}
316
317static int ChangeUser(const char *user, short dochdir)
318{
319    struct passwd *pas;
320
321    /*
322     * Obtain password entry and change privileges
323     */
324
325    pas = getpwnam(user);
326    if (pas == NULL) {
327        bb_perror_msg_and_die("failed to get uid for %s", user);
328    }
329    setenv("USER", pas->pw_name, 1);
330    setenv("HOME", pas->pw_dir, 1);
331    setenv("SHELL", DEFAULT_SHELL, 1);
332
333    /*
334     * Change running state to the user in question
335     */
336    change_identity(pas);
337
338    if (dochdir) {
339        if (chdir(pas->pw_dir) < 0) {
340            bb_perror_msg("chdir(%s) by %s failed", pas->pw_dir, user);
341            xchdir(TMPDIR);
342        }
343    }
344    return pas->pw_uid;
345}
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