crontab.c revision 184780
169408Sache/* Copyright 1988,1990,1993,1994 by Paul Vixie 259243Sobrien * All rights reserved 359243Sobrien * 459243Sobrien * Distribute freely, except: don't remove my name from the source or 559243Sobrien * documentation (don't take credit for my work), mark your changes (don't 659243Sobrien * get me blamed for your possible bugs), don't alter or remove this 759243Sobrien * notice. May be sold if buildable source is provided to buyer. No 859243Sobrien * warrantee of any kind, express or implied, is included with this 959243Sobrien * software; use at your own risk, responsibility for damages (if any) to 1059243Sobrien * anyone resulting from the use of this software rests entirely with the 1159243Sobrien * user. 1259243Sobrien * 1359243Sobrien * Send bug reports, bug fixes, enhancements, requests, flames, etc., and 1459243Sobrien * I'll try to keep a version up to date. I can be reached as follows: 1559243Sobrien * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul 1659243Sobrien * From Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp 1759243Sobrien */ 1859243Sobrien 1959243Sobrien#if !defined(lint) && !defined(LINT) 2059243Sobrienstatic const char rcsid[] = 2159243Sobrien "$FreeBSD: head/usr.sbin/cron/crontab/crontab.c 184780 2008-11-09 07:34:11Z matteo $"; 2259243Sobrien#endif 2359243Sobrien 2459243Sobrien/* crontab - install and manage per-user crontab files 2559243Sobrien * vix 02may87 [RCS has the rest of the log] 2659243Sobrien * vix 26jan87 [original] 2759243Sobrien */ 2859243Sobrien 2959243Sobrien#define MAIN_PROGRAM 3059243Sobrien 3159243Sobrien#include "cron.h" 3259243Sobrien#include <errno.h> 3359243Sobrien#include <fcntl.h> 3459243Sobrien#include <md5.h> 3559243Sobrien#include <paths.h> 3659243Sobrien#include <sys/file.h> 3759243Sobrien#include <sys/stat.h> 3859243Sobrien#ifdef USE_UTIMES 3959243Sobrien# include <sys/time.h> 4069408Sache#else 4159243Sobrien# include <time.h> 4269408Sache# include <utime.h> 4359243Sobrien#endif 4459243Sobrien#if defined(POSIX) 4559243Sobrien# include <locale.h> 4659243Sobrien#endif 4759243Sobrien 4859243Sobrien#define MD5_SIZE 33 4959243Sobrien#define NHEADER_LINES 3 5059243Sobrien 5159243Sobrien 5259243Sobrienenum opt_t { opt_unknown, opt_list, opt_delete, opt_edit, opt_replace }; 5359243Sobrien 5469408Sache#if DEBUGGING 5569408Sachestatic char *Options[] = { "???", "list", "delete", "edit", "replace" }; 5669408Sache#endif 5769408Sache 5859243Sobrien 5959243Sobrienstatic PID_T Pid; 6059243Sobrienstatic char User[MAX_UNAME], RealUser[MAX_UNAME]; 6159243Sobrienstatic char Filename[MAX_FNAME]; 6259243Sobrienstatic FILE *NewCrontab; 6359243Sobrienstatic int CheckErrorCount; 6459243Sobrienstatic enum opt_t Option; 6559243Sobrienstatic struct passwd *pw; 6659243Sobrienstatic char *tmp_path; 6759243Sobrienstatic void list_cmd(void), 6859243Sobrien delete_cmd(void), 6959243Sobrien edit_cmd(void), 7059243Sobrien poke_daemon(void), 7159243Sobrien check_error(char *), 7259243Sobrien parse_args(int c, char *v[]); 7359243Sobrienstatic int replace_cmd(void); 7459243Sobrien 7559243Sobrien 7659243Sobrienstatic void 7759243Sobrienusage(msg) 7859243Sobrien char *msg; 7959243Sobrien{ 8059243Sobrien fprintf(stderr, "crontab: usage error: %s\n", msg); 8159243Sobrien fprintf(stderr, "%s\n%s\n", 8259243Sobrien "usage: crontab [-u user] file", 8359243Sobrien " crontab [-u user] { -e | -l | -r }"); 8459243Sobrien exit(ERROR_EXIT); 8559243Sobrien} 8659243Sobrien 8759243Sobrien 8859243Sobrienint 8969408Sachemain(argc, argv) 9059243Sobrien int argc; 9169408Sache char *argv[]; 9259243Sobrien{ 9359243Sobrien int exitstatus; 9459243Sobrien 9559243Sobrien Pid = getpid(); 9659243Sobrien ProgramName = argv[0]; 9759243Sobrien 9859243Sobrien#if defined(POSIX) 9959243Sobrien setlocale(LC_ALL, ""); 10059243Sobrien#endif 10159243Sobrien 10259243Sobrien#if defined(BSD) 10359243Sobrien setlinebuf(stderr); 10459243Sobrien#endif 10559243Sobrien parse_args(argc, argv); /* sets many globals, opens a file */ 10659243Sobrien set_cron_uid(); 10759243Sobrien set_cron_cwd(); 10859243Sobrien if (!allowed(User)) { 10959243Sobrien warnx("you (%s) are not allowed to use this program", User); 11059243Sobrien log_it(RealUser, Pid, "AUTH", "crontab command not allowed"); 11159243Sobrien exit(ERROR_EXIT); 11259243Sobrien } 11359243Sobrien exitstatus = OK_EXIT; 11459243Sobrien switch (Option) { 11559243Sobrien case opt_list: list_cmd(); 11659243Sobrien break; 11759243Sobrien case opt_delete: delete_cmd(); 11859243Sobrien break; 11959243Sobrien case opt_edit: edit_cmd(); 12059243Sobrien break; 12159243Sobrien case opt_replace: if (replace_cmd() < 0) 12259243Sobrien exitstatus = ERROR_EXIT; 12359243Sobrien break; 12459243Sobrien case opt_unknown: 12559243Sobrien break; 12659243Sobrien } 12759243Sobrien exit(exitstatus); 12859243Sobrien /*NOTREACHED*/ 12959243Sobrien} 13059243Sobrien 13159243Sobrien 13259243Sobrienstatic void 13359243Sobrienparse_args(argc, argv) 13459243Sobrien int argc; 13559243Sobrien char *argv[]; 13659243Sobrien{ 13759243Sobrien int argch; 13859243Sobrien char resolved_path[PATH_MAX]; 13959243Sobrien 14059243Sobrien if (!(pw = getpwuid(getuid()))) 14159243Sobrien errx(ERROR_EXIT, "your UID isn't in the passwd file, bailing out"); 14259243Sobrien bzero(pw->pw_passwd, strlen(pw->pw_passwd)); 14359243Sobrien (void) strncpy(User, pw->pw_name, (sizeof User)-1); 14459243Sobrien User[(sizeof User)-1] = '\0'; 14559243Sobrien strcpy(RealUser, User); 14659243Sobrien Filename[0] = '\0'; 14759243Sobrien Option = opt_unknown; 14859243Sobrien while ((argch = getopt(argc, argv, "u:lerx:")) != -1) { 14959243Sobrien switch (argch) { 15059243Sobrien case 'x': 15159243Sobrien if (!set_debug_flags(optarg)) 15259243Sobrien usage("bad debug option"); 15359243Sobrien break; 15459243Sobrien case 'u': 15559243Sobrien if (getuid() != ROOT_UID) 15659243Sobrien errx(ERROR_EXIT, "must be privileged to use -u"); 15759243Sobrien if (!(pw = getpwnam(optarg))) 15859243Sobrien errx(ERROR_EXIT, "user `%s' unknown", optarg); 15959243Sobrien bzero(pw->pw_passwd, strlen(pw->pw_passwd)); 16059243Sobrien (void) strncpy(User, pw->pw_name, (sizeof User)-1); 16159243Sobrien User[(sizeof User)-1] = '\0'; 16259243Sobrien break; 16359243Sobrien case 'l': 16459243Sobrien if (Option != opt_unknown) 16559243Sobrien usage("only one operation permitted"); 16659243Sobrien Option = opt_list; 16759243Sobrien break; 16859243Sobrien case 'r': 16959243Sobrien if (Option != opt_unknown) 17059243Sobrien usage("only one operation permitted"); 17159243Sobrien Option = opt_delete; 17259243Sobrien break; 17359243Sobrien case 'e': 17459243Sobrien if (Option != opt_unknown) 17559243Sobrien usage("only one operation permitted"); 17659243Sobrien Option = opt_edit; 17759243Sobrien break; 17859243Sobrien default: 17959243Sobrien usage("unrecognized option"); 18059243Sobrien } 18159243Sobrien } 18259243Sobrien 18359243Sobrien endpwent(); 18459243Sobrien 18559243Sobrien if (Option != opt_unknown) { 18659243Sobrien if (argv[optind] != NULL) { 18759243Sobrien usage("no arguments permitted after this option"); 18859243Sobrien } 18959243Sobrien } else { 19059243Sobrien if (argv[optind] != NULL) { 19159243Sobrien Option = opt_replace; 19259243Sobrien (void) strncpy (Filename, argv[optind], (sizeof Filename)-1); 19359243Sobrien Filename[(sizeof Filename)-1] = '\0'; 19459243Sobrien 19559243Sobrien } else { 19659243Sobrien usage("file name must be specified for replace"); 19759243Sobrien } 19859243Sobrien } 19959243Sobrien 20059243Sobrien if (Option == opt_replace) { 20159243Sobrien /* we have to open the file here because we're going to 20259243Sobrien * chdir(2) into /var/cron before we get around to 20359243Sobrien * reading the file. 20459243Sobrien */ 20559243Sobrien if (!strcmp(Filename, "-")) { 20659243Sobrien NewCrontab = stdin; 20759243Sobrien } else if (realpath(Filename, resolved_path) != NULL && 20859243Sobrien !strcmp(resolved_path, SYSCRONTAB)) { 20959243Sobrien err(ERROR_EXIT, SYSCRONTAB " must be edited manually"); 21059243Sobrien } else { 21159243Sobrien /* relinquish the setuid status of the binary during 21259243Sobrien * the open, lest nonroot users read files they should 21359243Sobrien * not be able to read. we can't use access() here 21459243Sobrien * since there's a race condition. thanks go out to 21559243Sobrien * Arnt Gulbrandsen <agulbra@pvv.unit.no> for spotting 21659243Sobrien * the race. 21759243Sobrien */ 21859243Sobrien 21959243Sobrien if (swap_uids() < OK) 22059243Sobrien err(ERROR_EXIT, "swapping uids"); 22159243Sobrien if (!(NewCrontab = fopen(Filename, "r"))) 22259243Sobrien err(ERROR_EXIT, "%s", Filename); 22359243Sobrien if (swap_uids() < OK) 22459243Sobrien err(ERROR_EXIT, "swapping uids back"); 22559243Sobrien } 22659243Sobrien } 22759243Sobrien 22859243Sobrien Debug(DMISC, ("user=%s, file=%s, option=%s\n", 22959243Sobrien User, Filename, Options[(int)Option])) 23059243Sobrien} 23159243Sobrien 23259243Sobrienstatic void 23359243Sobriencopy_file(FILE *in, FILE *out) { 23459243Sobrien int x, ch; 23559243Sobrien 23659243Sobrien Set_LineNum(1) 23759243Sobrien /* ignore the top few comments since we probably put them there. 23859243Sobrien */ 23959243Sobrien for (x = 0; x < NHEADER_LINES; x++) { 24069408Sache ch = get_char(in); 24159243Sobrien if (EOF == ch) 24259243Sobrien break; 24359243Sobrien if ('#' != ch) { 24459243Sobrien putc(ch, out); 24559243Sobrien break; 24659243Sobrien } 24759243Sobrien while (EOF != (ch = get_char(in))) 24859243Sobrien if (ch == '\n') 24959243Sobrien break; 25069408Sache if (EOF == ch) 25159243Sobrien break; 25269408Sache } 25359243Sobrien 25459243Sobrien /* copy the rest of the crontab (if any) to the output file. 25559243Sobrien */ 25659243Sobrien if (EOF != ch) 25759243Sobrien while (EOF != (ch = get_char(in))) 25859243Sobrien putc(ch, out); 25959243Sobrien} 26059243Sobrien 26159243Sobrienstatic void 26259243Sobrienlist_cmd() { 26359243Sobrien char n[MAX_FNAME]; 26459243Sobrien FILE *f; 26559243Sobrien 26659243Sobrien log_it(RealUser, Pid, "LIST", User); 26759243Sobrien (void) snprintf(n, sizeof(n), CRON_TAB(User)); 26859243Sobrien if (!(f = fopen(n, "r"))) { 26959243Sobrien if (errno == ENOENT) 27059243Sobrien errx(ERROR_EXIT, "no crontab for %s", User); 27159243Sobrien else 27259243Sobrien err(ERROR_EXIT, "%s", n); 27359243Sobrien } 27459243Sobrien 27559243Sobrien /* file is open. copy to stdout, close. 27659243Sobrien */ 27759243Sobrien copy_file(f, stdout); 27859243Sobrien fclose(f); 27959243Sobrien} 28059243Sobrien 28159243Sobrien 28259243Sobrienstatic void 28359243Sobriendelete_cmd() { 28459243Sobrien char n[MAX_FNAME]; 28559243Sobrien int ch, first; 28659243Sobrien 28759243Sobrien if (isatty(STDIN_FILENO)) { 28859243Sobrien (void)fprintf(stderr, "remove crontab for %s? ", User); 28959243Sobrien first = ch = getchar(); 29059243Sobrien while (ch != '\n' && ch != EOF) 29159243Sobrien ch = getchar(); 29259243Sobrien if (first != 'y' && first != 'Y') 29359243Sobrien return; 29459243Sobrien } 29559243Sobrien 29659243Sobrien log_it(RealUser, Pid, "DELETE", User); 29759243Sobrien (void) snprintf(n, sizeof(n), CRON_TAB(User)); 29859243Sobrien if (unlink(n)) { 29959243Sobrien if (errno == ENOENT) 30059243Sobrien errx(ERROR_EXIT, "no crontab for %s", User); 30159243Sobrien else 30259243Sobrien err(ERROR_EXIT, "%s", n); 30359243Sobrien } 30459243Sobrien poke_daemon(); 30559243Sobrien} 30659243Sobrien 30759243Sobrien 30859243Sobrienstatic void 30959243Sobriencheck_error(msg) 31059243Sobrien char *msg; 31159243Sobrien{ 31259243Sobrien CheckErrorCount++; 31359243Sobrien fprintf(stderr, "\"%s\":%d: %s\n", Filename, LineNumber-1, msg); 31459243Sobrien} 31559243Sobrien 31659243Sobrien 31759243Sobrienstatic void 31859243Sobrienedit_cmd() { 31959243Sobrien char n[MAX_FNAME], q[MAX_TEMPSTR], *editor; 32059243Sobrien FILE *f; 32159243Sobrien int t; 32259243Sobrien struct stat statbuf, fsbuf; 32359243Sobrien WAIT_T waiter; 32459243Sobrien PID_T pid, xpid; 32559243Sobrien mode_t um; 32659243Sobrien int syntax_error = 0; 32759243Sobrien char orig_md5[MD5_SIZE]; 32859243Sobrien char new_md5[MD5_SIZE]; 32959243Sobrien 33059243Sobrien log_it(RealUser, Pid, "BEGIN EDIT", User); 33159243Sobrien (void) snprintf(n, sizeof(n), CRON_TAB(User)); 33259243Sobrien if (!(f = fopen(n, "r"))) { 33359243Sobrien if (errno != ENOENT) 33459243Sobrien err(ERROR_EXIT, "%s", n); 33559243Sobrien warnx("no crontab for %s - using an empty one", User); 33659243Sobrien if (!(f = fopen(_PATH_DEVNULL, "r"))) 33759243Sobrien err(ERROR_EXIT, _PATH_DEVNULL); 33859243Sobrien } 33959243Sobrien 34059243Sobrien um = umask(077); 34159243Sobrien (void) snprintf(Filename, sizeof(Filename), "/tmp/crontab.XXXXXXXXXX"); 34259243Sobrien if ((t = mkstemp(Filename)) == -1) { 34359243Sobrien warn("%s", Filename); 34459243Sobrien (void) umask(um); 34559243Sobrien goto fatal; 34659243Sobrien } 34759243Sobrien (void) umask(um); 34859243Sobrien#ifdef HAS_FCHOWN 34959243Sobrien if (fchown(t, getuid(), getgid()) < 0) { 35059243Sobrien#else 35159243Sobrien if (chown(Filename, getuid(), getgid()) < 0) { 35259243Sobrien#endif 35359243Sobrien warn("fchown"); 35459243Sobrien goto fatal; 35559243Sobrien } 35659243Sobrien if (!(NewCrontab = fdopen(t, "r+"))) { 35759243Sobrien warn("fdopen"); 35859243Sobrien goto fatal; 35959243Sobrien } 36059243Sobrien 36159243Sobrien copy_file(f, NewCrontab); 36259243Sobrien fclose(f); 36359243Sobrien if (fflush(NewCrontab)) 36459243Sobrien err(ERROR_EXIT, "%s", Filename); 36559243Sobrien if (fstat(t, &fsbuf) < 0) { 36659243Sobrien warn("unable to fstat temp file"); 36759243Sobrien goto fatal; 36859243Sobrien } 36959243Sobrien again: 37059243Sobrien if (stat(Filename, &statbuf) < 0) { 37159243Sobrien warn("stat"); 37259243Sobrien fatal: unlink(Filename); 37359243Sobrien exit(ERROR_EXIT); 37459243Sobrien } 37559243Sobrien if (statbuf.st_dev != fsbuf.st_dev || statbuf.st_ino != fsbuf.st_ino) 37659243Sobrien errx(ERROR_EXIT, "temp file must be edited in place"); 37759243Sobrien if (MD5File(Filename, orig_md5) == NULL) { 37859243Sobrien warn("MD5"); 37959243Sobrien goto fatal; 38059243Sobrien } 38159243Sobrien 38259243Sobrien if ((!(editor = getenv("VISUAL"))) 38359243Sobrien && (!(editor = getenv("EDITOR"))) 38459243Sobrien ) { 38559243Sobrien editor = EDITOR; 38659243Sobrien } 38759243Sobrien 38859243Sobrien /* we still have the file open. editors will generally rewrite the 38959243Sobrien * original file rather than renaming/unlinking it and starting a 39059243Sobrien * new one; even backup files are supposed to be made by copying 39159243Sobrien * rather than by renaming. if some editor does not support this, 39259243Sobrien * then don't use it. the security problems are more severe if we 39359243Sobrien * close and reopen the file around the edit. 39459243Sobrien */ 39559243Sobrien 39659243Sobrien switch (pid = fork()) { 39759243Sobrien case -1: 39859243Sobrien warn("fork"); 39959243Sobrien goto fatal; 40059243Sobrien case 0: 40159243Sobrien /* child */ 40259243Sobrien if (setuid(getuid()) < 0) 40359243Sobrien err(ERROR_EXIT, "setuid(getuid())"); 40459243Sobrien if (chdir("/tmp") < 0) 40559243Sobrien err(ERROR_EXIT, "chdir(/tmp)"); 40659243Sobrien if (strlen(editor) + strlen(Filename) + 2 >= MAX_TEMPSTR) 40759243Sobrien errx(ERROR_EXIT, "editor or filename too long"); 40859243Sobrien execlp(editor, editor, Filename, (char *)NULL); 40959243Sobrien err(ERROR_EXIT, "%s", editor); 41059243Sobrien /*NOTREACHED*/ 41159243Sobrien default: 41259243Sobrien /* parent */ 41359243Sobrien break; 41459243Sobrien } 41559243Sobrien 41659243Sobrien /* parent */ 41759243Sobrien { 41859243Sobrien void (*f[4])(); 41959243Sobrien f[0] = signal(SIGHUP, SIG_IGN); 42059243Sobrien f[1] = signal(SIGINT, SIG_IGN); 42159243Sobrien f[2] = signal(SIGTERM, SIG_IGN); 42259243Sobrien xpid = wait(&waiter); 42359243Sobrien signal(SIGHUP, f[0]); 42459243Sobrien signal(SIGINT, f[1]); 42559243Sobrien signal(SIGTERM, f[2]); 42659243Sobrien } 42759243Sobrien if (xpid != pid) { 42859243Sobrien warnx("wrong PID (%d != %d) from \"%s\"", xpid, pid, editor); 42959243Sobrien goto fatal; 43059243Sobrien } 43159243Sobrien if (WIFEXITED(waiter) && WEXITSTATUS(waiter)) { 43259243Sobrien warnx("\"%s\" exited with status %d", editor, WEXITSTATUS(waiter)); 43359243Sobrien goto fatal; 43459243Sobrien } 43559243Sobrien if (WIFSIGNALED(waiter)) { 43659243Sobrien warnx("\"%s\" killed; signal %d (%score dumped)", 43759243Sobrien editor, WTERMSIG(waiter), WCOREDUMP(waiter) ?"" :"no "); 43859243Sobrien goto fatal; 43959243Sobrien } 44059243Sobrien if (stat(Filename, &statbuf) < 0) { 44159243Sobrien warn("stat"); 44259243Sobrien goto fatal; 44359243Sobrien } 44459243Sobrien if (statbuf.st_dev != fsbuf.st_dev || statbuf.st_ino != fsbuf.st_ino) 44559243Sobrien errx(ERROR_EXIT, "temp file must be edited in place"); 44659243Sobrien if (MD5File(Filename, new_md5) == NULL) { 44759243Sobrien warn("MD5"); 44859243Sobrien goto fatal; 44959243Sobrien } 45059243Sobrien if (strcmp(orig_md5, new_md5) == 0 && !syntax_error) { 45159243Sobrien warnx("no changes made to crontab"); 45259243Sobrien goto remove; 45359243Sobrien } 45459243Sobrien warnx("installing new crontab"); 45559243Sobrien switch (replace_cmd()) { 45659243Sobrien case 0: /* Success */ 45759243Sobrien break; 45859243Sobrien case -1: /* Syntax error */ 45959243Sobrien for (;;) { 46059243Sobrien printf("Do you want to retry the same edit? "); 46159243Sobrien fflush(stdout); 46259243Sobrien q[0] = '\0'; 46359243Sobrien (void) fgets(q, sizeof q, stdin); 46459243Sobrien switch (islower(q[0]) ? q[0] : tolower(q[0])) { 46559243Sobrien case 'y': 46659243Sobrien syntax_error = 1; 46759243Sobrien goto again; 46859243Sobrien case 'n': 46959243Sobrien goto abandon; 47059243Sobrien default: 47159243Sobrien fprintf(stderr, "Enter Y or N\n"); 47259243Sobrien } 47359243Sobrien } 47459243Sobrien /*NOTREACHED*/ 47559243Sobrien case -2: /* Install error */ 47659243Sobrien abandon: 47759243Sobrien warnx("edits left in %s", Filename); 47859243Sobrien goto done; 47959243Sobrien default: 48059243Sobrien warnx("panic: bad switch() in replace_cmd()"); 48159243Sobrien goto fatal; 48259243Sobrien } 48359243Sobrien remove: 48459243Sobrien unlink(Filename); 48559243Sobrien done: 48659243Sobrien log_it(RealUser, Pid, "END EDIT", User); 48759243Sobrien} 48859243Sobrien 48959243Sobrien 49059243Sobrienvoid 49159243Sobrienstatic remove_tmp(int sig) 49259243Sobrien{ 49359243Sobrien if (tmp_path) { 49459243Sobrien unlink(tmp_path); 49559243Sobrien } 49659243Sobrien exit(ERROR_EXIT); 49759243Sobrien} 49859243Sobrien 49959243Sobrien 50059243Sobrien/* returns 0 on success 50159243Sobrien * -1 on syntax error 50259243Sobrien * -2 on install error 50359243Sobrien */ 50459243Sobrienstatic int 50559243Sobrienreplace_cmd() { 50659243Sobrien char n[MAX_FNAME], envstr[MAX_ENVSTR], tn[MAX_FNAME]; 50759243Sobrien FILE *tmp; 50859243Sobrien int ch, eof; 50969408Sache entry *e; 51059243Sobrien time_t now = time(NULL); 51159243Sobrien char **envp = env_init(); 51259243Sobrien void (*f[3])(); 51359243Sobrien 51459243Sobrien if (envp == NULL) { 51559243Sobrien warnx("cannot allocate memory"); 51659243Sobrien return (-2); 51759243Sobrien } 51859243Sobrien 51959243Sobrien (void) snprintf(n, sizeof(n), "tmp.%d", Pid); 52059243Sobrien (void) snprintf(tn, sizeof(n), CRON_TAB(n)); 52159243Sobrien 52259243Sobrien /* Set up to remove the temp file if interrupted by a signal. */ 52359243Sobrien f[0] = signal(SIGHUP, remove_tmp); 52459243Sobrien f[1] = signal(SIGINT, remove_tmp); 52559243Sobrien f[2] = signal(SIGTERM, remove_tmp); 52659243Sobrien tmp_path = tn; 52759243Sobrien 52859243Sobrien if (!(tmp = fopen(tn, "w+"))) { 52959243Sobrien warn("%s", tn); 53059243Sobrien return (-2); 53159243Sobrien } 53259243Sobrien 53359243Sobrien /* write a signature at the top of the file. 53469408Sache * 53569408Sache * VERY IMPORTANT: make sure NHEADER_LINES agrees with this code. 53659243Sobrien */ 53759243Sobrien fprintf(tmp, "# DO NOT EDIT THIS FILE - edit the master and reinstall.\n"); 53859243Sobrien fprintf(tmp, "# (%s installed on %-24.24s)\n", Filename, ctime(&now)); 53959243Sobrien fprintf(tmp, "# (Cron version -- %s)\n", rcsid); 54059243Sobrien 54159243Sobrien /* copy the crontab to the tmp 54259243Sobrien */ 54359243Sobrien rewind(NewCrontab); 54459243Sobrien Set_LineNum(1) 54559243Sobrien while (EOF != (ch = get_char(NewCrontab))) 54659243Sobrien putc(ch, tmp); 54759243Sobrien ftruncate(fileno(tmp), ftell(tmp)); 54859243Sobrien fflush(tmp); rewind(tmp); 54959243Sobrien 55059243Sobrien if (ferror(tmp)) { 55159243Sobrien warnx("error while writing new crontab to %s", tn); 55259243Sobrien fclose(tmp); unlink(tn); 55359243Sobrien return (-2); 55459243Sobrien } 55559243Sobrien 55659243Sobrien /* check the syntax of the file being installed. 55759243Sobrien */ 55859243Sobrien 55959243Sobrien /* BUG: was reporting errors after the EOF if there were any errors 56059243Sobrien * in the file proper -- kludged it by stopping after first error. 56169408Sache * vix 31mar87 56259243Sobrien */ 56359243Sobrien Set_LineNum(1 - NHEADER_LINES) 56459243Sobrien CheckErrorCount = 0; eof = FALSE; 56559243Sobrien while (!CheckErrorCount && !eof) { 56659243Sobrien switch (load_env(envstr, tmp)) { 56759243Sobrien case ERR: 56859243Sobrien eof = TRUE; 56959243Sobrien break; 57059243Sobrien case FALSE: 57159243Sobrien e = load_entry(tmp, check_error, pw, envp); 57259243Sobrien if (e) 57369408Sache free(e); 57459243Sobrien break; 57559243Sobrien case TRUE: 57659243Sobrien break; 57759243Sobrien } 57859243Sobrien } 57959243Sobrien 58059243Sobrien if (CheckErrorCount != 0) { 58159243Sobrien warnx("errors in crontab file, can't install"); 58259243Sobrien fclose(tmp); unlink(tn); 58359243Sobrien return (-1); 58459243Sobrien } 58559243Sobrien 58659243Sobrien#ifdef HAS_FCHOWN 58759243Sobrien if (fchown(fileno(tmp), ROOT_UID, -1) < OK) 58859243Sobrien#else 58959243Sobrien if (chown(tn, ROOT_UID, -1) < OK) 59059243Sobrien#endif 59159243Sobrien { 59259243Sobrien warn("chown"); 59359243Sobrien fclose(tmp); unlink(tn); 59459243Sobrien return (-2); 59559243Sobrien } 59659243Sobrien 59759243Sobrien#ifdef HAS_FCHMOD 59859243Sobrien if (fchmod(fileno(tmp), 0600) < OK) 59959243Sobrien#else 60059243Sobrien if (chmod(tn, 0600) < OK) 60159243Sobrien#endif 60259243Sobrien { 60359243Sobrien warn("chown"); 60459243Sobrien fclose(tmp); unlink(tn); 60559243Sobrien return (-2); 60659243Sobrien } 60759243Sobrien 60859243Sobrien if (fclose(tmp) == EOF) { 60959243Sobrien warn("fclose"); 61059243Sobrien unlink(tn); 61159243Sobrien return (-2); 61259243Sobrien } 61359243Sobrien 61459243Sobrien (void) snprintf(n, sizeof(n), CRON_TAB(User)); 61559243Sobrien if (rename(tn, n)) { 61659243Sobrien warn("error renaming %s to %s", tn, n); 61759243Sobrien unlink(tn); 61859243Sobrien return (-2); 61959243Sobrien } 62059243Sobrien 62159243Sobrien /* Restore the default signal handlers. */ 62259243Sobrien tmp_path = NULL; 62359243Sobrien signal(SIGHUP, f[0]); 62459243Sobrien signal(SIGINT, f[1]); 62559243Sobrien signal(SIGTERM, f[2]); 62659243Sobrien 62759243Sobrien log_it(RealUser, Pid, "REPLACE", User); 62859243Sobrien 62959243Sobrien poke_daemon(); 63059243Sobrien 63159243Sobrien return (0); 63259243Sobrien} 63359243Sobrien 63459243Sobrien 63559243Sobrienstatic void 63659243Sobrienpoke_daemon() { 63759243Sobrien#ifdef USE_UTIMES 63859243Sobrien struct timeval tvs[2]; 63959243Sobrien struct timezone tz; 64059243Sobrien 64159243Sobrien (void) gettimeofday(&tvs[0], &tz); 64259243Sobrien tvs[1] = tvs[0]; 64359243Sobrien if (utimes(SPOOL_DIR, tvs) < OK) { 64459243Sobrien warn("can't update mtime on spooldir %s", SPOOL_DIR); 64559243Sobrien return; 64659243Sobrien } 64759243Sobrien#else 64859243Sobrien if (utime(SPOOL_DIR, NULL) < OK) { 64959243Sobrien warn("can't update mtime on spooldir %s", SPOOL_DIR); 65059243Sobrien return; 65159243Sobrien } 65259243Sobrien#endif /*USE_UTIMES*/ 65359243Sobrien} 65459243Sobrien