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Diffstat (limited to 'usr.sbin/lpr/lpd/lpd.c')
-rw-r--r--usr.sbin/lpr/lpd/lpd.c511
1 files changed, 511 insertions, 0 deletions
diff --git a/usr.sbin/lpr/lpd/lpd.c b/usr.sbin/lpr/lpd/lpd.c
new file mode 100644
index 00000000000..f06efdce8d9
--- /dev/null
+++ b/usr.sbin/lpr/lpd/lpd.c
@@ -0,0 +1,511 @@
+/*
+ * Copyright (c) 1983, 1993, 1994
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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
+static char copyright[] =
+"@(#) Copyright (c) 1983, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)lpd.c 8.4 (Berkeley) 4/17/94";
+#endif /* not lint */
+
+/*
+ * lpd -- line printer daemon.
+ *
+ * Listen for a connection and perform the requested operation.
+ * Operations are:
+ * \1printer\n
+ * check the queue for jobs and print any found.
+ * \2printer\n
+ * receive a job from another machine and queue it.
+ * \3printer [users ...] [jobs ...]\n
+ * return the current state of the queue (short form).
+ * \4printer [users ...] [jobs ...]\n
+ * return the current state of the queue (long form).
+ * \5printer person [users ...] [jobs ...]\n
+ * remove jobs from the queue.
+ *
+ * Strategy to maintain protected spooling area:
+ * 1. Spooling area is writable only by daemon and spooling group
+ * 2. lpr runs setuid root and setgrp spooling group; it uses
+ * root to access any file it wants (verifying things before
+ * with an access call) and group id to know how it should
+ * set up ownership of files in the spooling area.
+ * 3. Files in spooling area are owned by root, group spooling
+ * group, with mode 660.
+ * 4. lpd, lpq and lprm run setuid daemon and setgrp spooling group to
+ * access files and printer. Users can't get to anything
+ * w/o help of lpq and lprm programs.
+ */
+
+#include <sys/param.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+
+#include <netdb.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "lp.h"
+#include "lp.local.h"
+#include "pathnames.h"
+#include "extern.h"
+
+int lflag; /* log requests flag */
+int from_remote; /* from remote socket */
+
+static void reapchild __P((int));
+static void mcleanup __P((int));
+static void doit __P((void));
+static void startup __P((void));
+static void chkhost __P((struct sockaddr_in *));
+
+uid_t uid, euid;
+
+int
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ int f, funix, finet, options, fromlen;
+ fd_set defreadfds;
+ struct sockaddr_un un, fromunix;
+ struct sockaddr_in sin, frominet;
+ int omask, lfd;
+
+ euid = geteuid(); /* these shouldn't be different */
+ uid = getuid();
+ options = 0;
+ gethostname(host, sizeof(host));
+ name = argv[0];
+
+ while (--argc > 0) {
+ argv++;
+ if (argv[0][0] == '-')
+ switch (argv[0][1]) {
+ case 'd':
+ options |= SO_DEBUG;
+ break;
+ case 'l':
+ lflag++;
+ break;
+ }
+ }
+
+#ifndef DEBUG
+ /*
+ * Set up standard environment by detaching from the parent.
+ */
+ daemon(0, 0);
+#endif
+
+ openlog("lpd", LOG_PID, LOG_LPR);
+ syslog(LOG_INFO, "restarted");
+ (void) umask(0);
+ lfd = open(_PATH_MASTERLOCK, O_WRONLY|O_CREAT, 0644);
+ if (lfd < 0) {
+ syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
+ exit(1);
+ }
+ if (flock(lfd, LOCK_EX|LOCK_NB) < 0) {
+ if (errno == EWOULDBLOCK) /* active deamon present */
+ exit(0);
+ syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
+ exit(1);
+ }
+ ftruncate(lfd, 0);
+ /*
+ * write process id for others to know
+ */
+ sprintf(line, "%u\n", getpid());
+ f = strlen(line);
+ if (write(lfd, line, f) != f) {
+ syslog(LOG_ERR, "%s: %m", _PATH_MASTERLOCK);
+ exit(1);
+ }
+ signal(SIGCHLD, reapchild);
+ /*
+ * Restart all the printers.
+ */
+ startup();
+ (void) unlink(_PATH_SOCKETNAME);
+ funix = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (funix < 0) {
+ syslog(LOG_ERR, "socket: %m");
+ exit(1);
+ }
+#define mask(s) (1 << ((s) - 1))
+ omask = sigblock(mask(SIGHUP)|mask(SIGINT)|mask(SIGQUIT)|mask(SIGTERM));
+ signal(SIGHUP, mcleanup);
+ signal(SIGINT, mcleanup);
+ signal(SIGQUIT, mcleanup);
+ signal(SIGTERM, mcleanup);
+ memset(&un, 0, sizeof(un));
+ un.sun_family = AF_UNIX;
+ strcpy(un.sun_path, _PATH_SOCKETNAME);
+#ifndef SUN_LEN
+#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
+#endif
+ if (bind(funix, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
+ syslog(LOG_ERR, "ubind: %m");
+ exit(1);
+ }
+ sigsetmask(omask);
+ FD_ZERO(&defreadfds);
+ FD_SET(funix, &defreadfds);
+ listen(funix, 5);
+ finet = socket(AF_INET, SOCK_STREAM, 0);
+ if (finet >= 0) {
+ struct servent *sp;
+
+ if (options & SO_DEBUG)
+ if (setsockopt(finet, SOL_SOCKET, SO_DEBUG, 0, 0) < 0) {
+ syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
+ mcleanup(0);
+ }
+ sp = getservbyname("printer", "tcp");
+ if (sp == NULL) {
+ syslog(LOG_ERR, "printer/tcp: unknown service");
+ mcleanup(0);
+ }
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_port = sp->s_port;
+ if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+ syslog(LOG_ERR, "bind: %m");
+ mcleanup(0);
+ }
+ FD_SET(finet, &defreadfds);
+ listen(finet, 5);
+ }
+ /*
+ * Main loop: accept, do a request, continue.
+ */
+ memset(&frominet, 0, sizeof(frominet));
+ memset(&fromunix, 0, sizeof(fromunix));
+ for (;;) {
+ int domain, nfds, s;
+ fd_set readfds;
+
+ FD_COPY(&defreadfds, &readfds);
+ nfds = select(20, &readfds, 0, 0, 0);
+ if (nfds <= 0) {
+ if (nfds < 0 && errno != EINTR)
+ syslog(LOG_WARNING, "select: %m");
+ continue;
+ }
+ if (FD_ISSET(funix, &readfds)) {
+ domain = AF_UNIX, fromlen = sizeof(fromunix);
+ s = accept(funix,
+ (struct sockaddr *)&fromunix, &fromlen);
+ } else /* if (FD_ISSET(finet, &readfds)) */ {
+ domain = AF_INET, fromlen = sizeof(frominet);
+ s = accept(finet,
+ (struct sockaddr *)&frominet, &fromlen);
+ }
+ if (s < 0) {
+ if (errno != EINTR)
+ syslog(LOG_WARNING, "accept: %m");
+ continue;
+ }
+ if (fork() == 0) {
+ signal(SIGCHLD, SIG_IGN);
+ signal(SIGHUP, SIG_IGN);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGTERM, SIG_IGN);
+ (void) close(funix);
+ (void) close(finet);
+ dup2(s, 1);
+ (void) close(s);
+ if (domain == AF_INET) {
+ from_remote = 1;
+ chkhost(&frominet);
+ } else
+ from_remote = 0;
+ doit();
+ exit(0);
+ }
+ (void) close(s);
+ }
+}
+
+static void
+reapchild(signo)
+ int signo;
+{
+ union wait status;
+
+ while (wait3((int *)&status, WNOHANG, 0) > 0)
+ ;
+}
+
+static void
+mcleanup(signo)
+ int signo;
+{
+ if (lflag)
+ syslog(LOG_INFO, "exiting");
+ unlink(_PATH_SOCKETNAME);
+ exit(0);
+}
+
+/*
+ * Stuff for handling job specifications
+ */
+char *user[MAXUSERS]; /* users to process */
+int users; /* # of users in user array */
+int requ[MAXREQUESTS]; /* job number of spool entries */
+int requests; /* # of spool requests */
+char *person; /* name of person doing lprm */
+
+char fromb[MAXHOSTNAMELEN]; /* buffer for client's machine name */
+char cbuf[BUFSIZ]; /* command line buffer */
+char *cmdnames[] = {
+ "null",
+ "printjob",
+ "recvjob",
+ "displayq short",
+ "displayq long",
+ "rmjob"
+};
+
+static void
+doit()
+{
+ register char *cp;
+ register int n;
+
+ for (;;) {
+ cp = cbuf;
+ do {
+ if (cp >= &cbuf[sizeof(cbuf) - 1])
+ fatal("Command line too long");
+ if ((n = read(1, cp, 1)) != 1) {
+ if (n < 0)
+ fatal("Lost connection");
+ return;
+ }
+ } while (*cp++ != '\n');
+ *--cp = '\0';
+ cp = cbuf;
+ if (lflag) {
+ if (*cp >= '\1' && *cp <= '\5')
+ syslog(LOG_INFO, "%s requests %s %s",
+ from, cmdnames[*cp], cp+1);
+ else
+ syslog(LOG_INFO, "bad request (%d) from %s",
+ *cp, from);
+ }
+ switch (*cp++) {
+ case '\1': /* check the queue and print any jobs there */
+ printer = cp;
+ printjob();
+ break;
+ case '\2': /* receive files to be queued */
+ if (!from_remote) {
+ syslog(LOG_INFO, "illegal request (%d)", *cp);
+ exit(1);
+ }
+ printer = cp;
+ recvjob();
+ break;
+ case '\3': /* display the queue (short form) */
+ case '\4': /* display the queue (long form) */
+ printer = cp;
+ while (*cp) {
+ if (*cp != ' ') {
+ cp++;
+ continue;
+ }
+ *cp++ = '\0';
+ while (isspace(*cp))
+ cp++;
+ if (*cp == '\0')
+ break;
+ if (isdigit(*cp)) {
+ if (requests >= MAXREQUESTS)
+ fatal("Too many requests");
+ requ[requests++] = atoi(cp);
+ } else {
+ if (users >= MAXUSERS)
+ fatal("Too many users");
+ user[users++] = cp;
+ }
+ }
+ displayq(cbuf[0] - '\3');
+ exit(0);
+ case '\5': /* remove a job from the queue */
+ if (!from_remote) {
+ syslog(LOG_INFO, "illegal request (%d)", *cp);
+ exit(1);
+ }
+ printer = cp;
+ while (*cp && *cp != ' ')
+ cp++;
+ if (!*cp)
+ break;
+ *cp++ = '\0';
+ person = cp;
+ while (*cp) {
+ if (*cp != ' ') {
+ cp++;
+ continue;
+ }
+ *cp++ = '\0';
+ while (isspace(*cp))
+ cp++;
+ if (*cp == '\0')
+ break;
+ if (isdigit(*cp)) {
+ if (requests >= MAXREQUESTS)
+ fatal("Too many requests");
+ requ[requests++] = atoi(cp);
+ } else {
+ if (users >= MAXUSERS)
+ fatal("Too many users");
+ user[users++] = cp;
+ }
+ }
+ rmjob();
+ break;
+ }
+ fatal("Illegal service request");
+ }
+}
+
+/*
+ * Make a pass through the printcap database and start printing any
+ * files left from the last time the machine went down.
+ */
+static void
+startup()
+{
+ char *buf;
+ register char *cp;
+ int pid;
+
+ /*
+ * Restart the daemons.
+ */
+ while (cgetnext(&buf, printcapdb) > 0) {
+ for (cp = buf; *cp; cp++)
+ if (*cp == '|' || *cp == ':') {
+ *cp = '\0';
+ break;
+ }
+ if ((pid = fork()) < 0) {
+ syslog(LOG_WARNING, "startup: cannot fork");
+ mcleanup(0);
+ }
+ if (!pid) {
+ printer = buf;
+ cgetclose();
+ printjob();
+ }
+ }
+}
+
+#define DUMMY ":nobody::"
+
+/*
+ * Check to see if the from host has access to the line printer.
+ */
+static void
+chkhost(f)
+ struct sockaddr_in *f;
+{
+ register struct hostent *hp;
+ register FILE *hostf;
+ int first = 1;
+ extern char *inet_ntoa();
+
+ f->sin_port = ntohs(f->sin_port);
+ if (f->sin_family != AF_INET || f->sin_port >= IPPORT_RESERVED)
+ fatal("Malformed from address");
+
+ /* Need real hostname for temporary filenames */
+ hp = gethostbyaddr((char *)&f->sin_addr,
+ sizeof(struct in_addr), f->sin_family);
+ if (hp == NULL)
+ fatal("Host name for your address (%s) unknown",
+ inet_ntoa(f->sin_addr));
+
+ (void) strncpy(fromb, hp->h_name, sizeof(fromb));
+ from[sizeof(fromb) - 1] = '\0';
+ from = fromb;
+
+ hostf = fopen(_PATH_HOSTSEQUIV, "r");
+again:
+ if (hostf) {
+ if (__ivaliduser(hostf, f->sin_addr.s_addr,
+ DUMMY, DUMMY) == 0) {
+ (void) fclose(hostf);
+ return;
+ }
+ (void) fclose(hostf);
+ }
+ if (first == 1) {
+ first = 0;
+ hostf = fopen(_PATH_HOSTSLPD, "r");
+ goto again;
+ }
+ fatal("Your host does not have line printer access");
+ /*NOTREACHED*/
+}
+
+
+
+
+
+
+
+
+
+
+
+
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