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- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and that due credit is given
- * to the University of California at Berkeley. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission. This software
- * is provided ``as is'' without express or implied warranty.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)rmjob.c 5.2 (Berkeley) 5/5/88";
- #endif /* not lint */
-
- /*
- * rmjob - remove the specified jobs from the queue.
- */
-
- #include "lp.h"
-
- /*
- * Stuff for handling lprm specifications
- */
- extern char *user[]; /* users to process */
- extern int users; /* # of users in user array */
- extern int requ[]; /* job number of spool entries */
- extern int requests; /* # of spool requests */
- extern char *person; /* name of person doing lprm */
-
- char root[] = "root";
- int all = 0; /* eliminate all files (root only) */
- int cur_daemon; /* daemon's pid */
- char current[40]; /* active control file name */
-
- int iscf();
-
- rmjob()
- {
- register int i, nitems;
- int assasinated = 0;
- struct direct **files;
-
- if ((i = pgetent(line, printer)) < 0)
- fatal("cannot open printer description file");
- else if (i == 0)
- fatal("unknown printer");
- if ((SD = pgetstr("sd", &bp)) == NULL)
- SD = DEFSPOOL;
- if ((LO = pgetstr("lo", &bp)) == NULL)
- LO = DEFLOCK;
- if ((LP = pgetstr("lp", &bp)) == NULL)
- LP = DEFDEVLP;
- if ((RP = pgetstr("rp", &bp)) == NULL)
- RP = DEFLP;
- RM = pgetstr("rm", &bp);
-
- /*
- * If the format was `lprm -' and the user isn't the super-user,
- * then fake things to look like he said `lprm user'.
- */
- if (users < 0) {
- if (getuid() == 0)
- all = 1; /* all files in local queue */
- else {
- user[0] = person;
- users = 1;
- }
- }
- if (!strcmp(person, "-all")) {
- if (from == host)
- fatal("The login name \"-all\" is reserved");
- all = 1; /* all those from 'from' */
- person = root;
- }
-
- if (chdir(SD) < 0)
- fatal("cannot chdir to spool directory");
- if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
- fatal("cannot access spool directory");
-
- if (nitems) {
- /*
- * Check for an active printer daemon (in which case we
- * kill it if it is reading our file) then remove stuff
- * (after which we have to restart the daemon).
- */
- if (lockchk(LO) && chk(current)) {
- assasinated = kill(cur_daemon, SIGINT) == 0;
- if (!assasinated)
- fatal("cannot kill printer daemon");
- }
- /*
- * process the files
- */
- for (i = 0; i < nitems; i++)
- process(files[i]->d_name);
- }
- chkremote();
- /*
- * Restart the printer daemon if it was killed
- */
- if (assasinated && !startdaemon(printer))
- fatal("cannot restart printer daemon\n");
- exit(0);
- }
-
- /*
- * Process a lock file: collect the pid of the active
- * daemon and the file name of the active spool entry.
- * Return boolean indicating existence of a lock file.
- */
- lockchk(s)
- char *s;
- {
- register FILE *fp;
- register int i, n;
-
- if ((fp = fopen(s, "r")) == NULL)
- if (errno == EACCES)
- fatal("can't access lock file");
- else
- return(0);
- if (!getline(fp)) {
- (void) fclose(fp);
- return(0); /* no daemon present */
- }
- cur_daemon = atoi(line);
- if (kill(cur_daemon, 0) < 0) {
- (void) fclose(fp);
- return(0); /* no daemon present */
- }
- for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
- if (i > 5) {
- n = 1;
- break;
- }
- sleep(i);
- }
- current[n-1] = '\0';
- (void) fclose(fp);
- return(1);
- }
-
- /*
- * Process a control file.
- */
- process(file)
- char *file;
- {
- FILE *cfp;
-
- if (!chk(file))
- return;
- if ((cfp = fopen(file, "r")) == NULL)
- fatal("cannot open %s", file);
- while (getline(cfp)) {
- switch (line[0]) {
- case 'U': /* unlink associated files */
- if (from != host)
- printf("%s: ", host);
- printf(unlink(line+1) ? "cannot dequeue %s\n" :
- "%s dequeued\n", line+1);
- }
- }
- (void) fclose(cfp);
- if (from != host)
- printf("%s: ", host);
- printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file);
- }
-
- /*
- * Do the dirty work in checking
- */
- chk(file)
- char *file;
- {
- register int *r, n;
- register char **u, *cp;
- FILE *cfp;
-
- /*
- * Check for valid cf file name (mostly checking current).
- */
- if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
- return(0);
-
- if (all && (from == host || !strcmp(from, file+6)))
- return(1);
-
- /*
- * get the owner's name from the control file.
- */
- if ((cfp = fopen(file, "r")) == NULL)
- return(0);
- while (getline(cfp)) {
- if (line[0] == 'P')
- break;
- }
- (void) fclose(cfp);
- if (line[0] != 'P')
- return(0);
-
- if (users == 0 && requests == 0)
- return(!strcmp(file, current) && isowner(line+1, file));
- /*
- * Check the request list
- */
- for (n = 0, cp = file+3; isdigit(*cp); )
- n = n * 10 + (*cp++ - '0');
- for (r = requ; r < &requ[requests]; r++)
- if (*r == n && isowner(line+1, file))
- return(1);
- /*
- * Check to see if it's in the user list
- */
- for (u = user; u < &user[users]; u++)
- if (!strcmp(*u, line+1) && isowner(line+1, file))
- return(1);
- return(0);
- }
-
- /*
- * If root is removing a file on the local machine, allow it.
- * If root is removing a file from a remote machine, only allow
- * files sent from the remote machine to be removed.
- * Normal users can only remove the file from where it was sent.
- */
- isowner(owner, file)
- char *owner, *file;
- {
- if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
- return(1);
- if (!strcmp(person, owner) && !strcmp(from, file+6))
- return(1);
- if (from != host)
- printf("%s: ", host);
- printf("%s: Permission denied\n", file);
- return(0);
- }
-
- /*
- * Check to see if we are sending files to a remote machine. If we are,
- * then try removing files on the remote machine.
- */
- chkremote()
- {
- register char *cp;
- register int i, rem;
- char buf[BUFSIZ];
-
- if (*LP || RM == NULL)
- return; /* not sending to a remote machine */
-
- /*
- * Flush stdout so the user can see what has been deleted
- * while we wait (possibly) for the connection.
- */
- fflush(stdout);
-
- sprintf(buf, "\5%s %s", RP, all ? "-all" : person);
- cp = buf;
- for (i = 0; i < users; i++) {
- cp += strlen(cp);
- *cp++ = ' ';
- strcpy(cp, user[i]);
- }
- for (i = 0; i < requests; i++) {
- cp += strlen(cp);
- (void) sprintf(cp, " %d", requ[i]);
- }
- strcat(cp, "\n");
- rem = getport(RM);
- if (rem < 0) {
- if (from != host)
- printf("%s: ", host);
- printf("connection to %s is down\n", RM);
- } else {
- i = strlen(buf);
- if (write(rem, buf, i) != i)
- fatal("Lost connection");
- while ((i = read(rem, buf, sizeof(buf))) > 0)
- (void) fwrite(buf, 1, i, stdout);
- (void) close(rem);
- }
- }
-
- /*
- * Return 1 if the filename begins with 'cf'
- */
- iscf(d)
- struct direct *d;
- {
- return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
- }
-