/* $OpenBSD: rmjob.c,v 1.17 2007/04/07 21:12:12 stevesk Exp $ */ /* $NetBSD: rmjob.c,v 1.16 2000/04/16 14:43:58 mrg Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. 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. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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, WHETHER 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. */ #ifndef lint #if 0 static const char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95"; #else static const char rcsid[] = "$OpenBSD: rmjob.c,v 1.17 2007/04/07 21:12:12 stevesk Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include "lp.h" #include "lp.local.h" #include "pathnames.h" /* * rmjob - remove the specified jobs from the queue. */ /* * 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 */ static char root[] = "root"; static int all = 0; /* eliminate all files (root only) */ static int cur_daemon; /* daemon's pid */ static char current[NAME_MAX]; /* active control file name */ static void do_unlink(char *); static void alarmer(int); static int lockchk(char *); void rmjob(void) { int i, nitems; int assasinated = 0; struct dirent **files; char *cp; if ((i = cgetent(&bp, printcapdb, printer)) == -2) fatal("can't open printer description file"); else if (i == -1) fatal("unknown printer"); else if (i == -3) fatal("potential reference loop detected in printcap file"); if (cgetstr(bp, DEFLP, &LP) < 0) LP = _PATH_DEFDEVLP; if (cgetstr(bp, "rp", &RP) < 0) RP = DEFLP; if (cgetstr(bp, "sd", &SD) < 0) SD = _PATH_DEFSPOOL; if (cgetstr(bp,"lo", &LO) < 0) LO = DEFLOCK; cgetstr(bp, "rm", &RM); if ((cp = checkremote()) != NULL) printf("Warning: %s\n", cp); /* * 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; } PRIV_START; if (chdir(SD) < 0) fatal("cannot chdir to spool directory"); if ((nitems = scandir(".", &files, iscf, NULL)) < 0) fatal("cannot access spool directory"); PRIV_END; if (nitems) { /* * Check for an active printer daemon. If one is running * and it is reading our file, kill it, then remove stuff. * Lastly, restart the daemon if it is not (or no longer) * running. */ if (lockchk(LO) && chk(current)) { PRIV_START; assasinated = kill(cur_daemon, SIGINT) == 0; PRIV_END; if (!assasinated) fatal("cannot kill printer daemon"); } /* * process the files */ for (i = 0; i < nitems; i++) process(files[i]->d_name); } rmremote(); /* * Restart the printer daemon if it was killed */ if (assasinated && !startdaemon(printer)) fatal("cannot restart printer daemon"); 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. */ static int lockchk(char *s) { FILE *fp = NULL; int fd, i, n; /* NOTE: lock file is owned by root, not the user. */ PRIV_START; fd = safe_open(s, O_RDONLY|O_NOFOLLOW, 0); PRIV_END; if (fd < 0 || (fp = fdopen(fd, "r")) == NULL) { if (fd >= 0) close(fd); 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 && errno != EPERM) { (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. */ void process(char *file) { FILE *cfp = NULL; int fd; if (!chk(file)) return; PRIV_START; fd = safe_open(file, O_RDONLY|O_NOFOLLOW, 0); PRIV_END; if (fd < 0 || (cfp = fdopen(fd, "r")) == NULL) { if (fd >= 0) close(fd); fatal("cannot open %s", file); } while (getline(cfp)) { switch (line[0]) { case 'U': /* unlink associated files */ if (strchr(line+1, '/') || strncmp(line+1, "df", 2)) break; do_unlink(line+1); } } (void)fclose(cfp); do_unlink(file); } static void do_unlink(char *file) { int ret; if (from != host) printf("%s: ", host); PRIV_START; ret = unlink(file); PRIV_END; printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); } /* * Do the dirty work in checking */ int chk(char *file) { int *r, n, fd; char **u, *cp; FILE *cfp = NULL; /* * 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. */ PRIV_START; fd = safe_open(file, O_RDONLY|O_NOFOLLOW, 0); PRIV_END; if (fd < 0 || (cfp = fdopen(fd, "r")) == NULL) { if (fd >= 0) close(fd); 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. */ int isowner(char *owner, char *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. */ void rmremote(void) { char *cp; int i, rem; size_t n; char buf[BUFSIZ]; if (!remote) 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); /* the trailing space will be replaced with a newline later */ n = snprintf(buf, sizeof(buf), "\5%s %s ", RP, all ? "-all" : person); if (n == -1 || n >= sizeof(buf)) goto bad; cp = buf + n; for (i = 0; i < users; i++) { n = strlcpy(cp, user[i], sizeof(buf) - (cp - buf + 1)); if (n >= sizeof(buf) - (cp - buf + 1)) goto bad; cp += n; *cp++ = ' '; } *cp = '\0'; for (i = 0; i < requests; i++) { n = snprintf(cp, sizeof(buf) - (cp - buf), "%d ", requ[i]); if (n == -1 || n >= sizeof(buf) - (cp - buf)) goto bad; cp += n; } cp[-1] = '\n'; /* replace space with newline, leave the NUL */ rem = getport(RM, 0); if (rem < 0) { if (from != host) printf("%s: ", host); printf("connection to %s is down\n", RM); } else { struct sigaction osa, nsa; memset(&nsa, 0, sizeof(nsa)); nsa.sa_handler = alarmer; sigemptyset(&nsa.sa_mask); nsa.sa_flags = 0; (void)sigaction(SIGALRM, &nsa, &osa); alarm(wait_time); 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); alarm(0); (void)sigaction(SIGALRM, &osa, NULL); (void)close(rem); } return; bad: printf("remote buffer too large\n"); return; } static void alarmer(int s) { /* nothing */ } /* * Return 1 if the filename begins with 'cf' */ int iscf(struct dirent *d) { return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); }