mirror of
https://github.com/xcat2/xNBA.git
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743 lines
16 KiB
C
743 lines
16 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1983 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)tftpd.c 5.8 (Berkeley) 6/18/88";
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#endif /* not lint */
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/*
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* Trivial file transfer protocol server.
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*
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* This version includes many modifications by Jim Guyton <guyton@rand-unix>
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*
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* Further modifications by Markus Gutschke <gutschk@math.uni-muenster.de>
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* - RFC1782 option parsing
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* - RFC1783 extended blocksize
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* - "-c" option for changing the root directory
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* - "-d" option for debugging output
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/tftp.h>
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#include <alloca.h>
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#include <string.h>
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#include <signal.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <setjmp.h>
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#include <syslog.h>
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#define TIMEOUT 5
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#ifndef OACK
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#define OACK 06
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#endif
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#ifndef EOPTNEG
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#define EOPTNEG 8
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#endif
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extern int errno;
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struct sockaddr_in sin = { AF_INET };
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int peer;
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int rexmtval = TIMEOUT;
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int maxtimeout = 5*TIMEOUT;
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#define PKTSIZE (1432+4) /* SEGSIZE+4 */
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int segsize = SEGSIZE;
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char buf[PKTSIZE];
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char ackbuf[PKTSIZE];
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struct sockaddr_in from;
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int fromlen;
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char *rootdir = NULL;
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int debug = 0;
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struct filters {
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struct filters *next;
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char *fname;
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} *filters = NULL;
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int isfilter = 0;
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main(argc, argv)
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char *argv[];
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{
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register struct tftphdr *tp;
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register int n;
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int on = 1;
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extern int optind;
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extern char *optarg;
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openlog(argv[0], LOG_PID, LOG_DAEMON);
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while ((n = getopt(argc, argv, "c:dr:")) >= 0) {
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switch (n) {
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case 'c':
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if (rootdir)
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goto usage;
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rootdir = optarg;
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break;
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case 'd':
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debug++;
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break;
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case 'r': {
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struct filters *fp = (void *)
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malloc(sizeof(struct filters) +
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strlen(optarg) + 1);
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fp->next = filters;
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fp->fname = (char *)(fp + 1);
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strcpy(fp->fname, optarg);
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filters = fp;
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break; }
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default:
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usage:
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syslog(LOG_ERR, "Usage: %s [-c chroot] "
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"[-r readfilter] [-d]\n",
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argv[0]);
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exit(1);
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}
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}
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if (argc-optind != 0)
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goto usage;
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ioctl(0, FIONBIO, &on);
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/* if (ioctl(0, FIONBIO, &on) < 0) {
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syslog(LOG_ERR, "ioctl(FIONBIO): %m\n");
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exit(1);
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}
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*/
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fromlen = sizeof (from);
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n = recvfrom(0, buf, segsize+4, 0,
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(struct sockaddr *)&from, &fromlen);
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if (n < 0) {
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syslog(LOG_ERR, "recvfrom: %m\n");
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exit(1);
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}
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/*
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* Now that we have read the message out of the UDP
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* socket, we fork and exit. Thus, inetd will go back
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* to listening to the tftp port, and the next request
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* to come in will start up a new instance of tftpd.
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*
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* We do this so that inetd can run tftpd in "wait" mode.
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* The problem with tftpd running in "nowait" mode is that
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* inetd may get one or more successful "selects" on the
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* tftp port before we do our receive, so more than one
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* instance of tftpd may be started up. Worse, if tftpd
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* break before doing the above "recvfrom", inetd would
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* spawn endless instances, clogging the system.
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*/
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{
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int pid;
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int i, j;
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for (i = 1; i < 20; i++) {
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pid = fork();
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if (pid < 0) {
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sleep(i);
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/*
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* flush out to most recently sent request.
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*
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* This may drop some request, but those
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* will be resent by the clients when
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* they timeout. The positive effect of
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* this flush is to (try to) prevent more
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* than one tftpd being started up to service
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* a single request from a single client.
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*/
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j = sizeof from;
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i = recvfrom(0, buf, segsize+4, 0,
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(struct sockaddr *)&from, &j);
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if (i > 0) {
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n = i;
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fromlen = j;
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}
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} else {
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break;
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}
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}
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if (pid < 0) {
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syslog(LOG_ERR, "fork: %m\n");
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exit(1);
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} else if (pid != 0) {
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exit(0);
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}
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}
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from.sin_family = AF_INET;
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alarm(0);
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close(0);
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close(1);
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peer = socket(AF_INET, SOCK_DGRAM, 0);
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if (peer < 0) {
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syslog(LOG_ERR, "socket: %m\n");
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exit(1);
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}
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if (bind(peer, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
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syslog(LOG_ERR, "bind: %m\n");
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exit(1);
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}
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if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
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syslog(LOG_ERR, "connect: %m\n");
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exit(1);
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}
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tp = (struct tftphdr *)buf;
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tp->th_opcode = ntohs(tp->th_opcode);
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if (tp->th_opcode == RRQ || tp->th_opcode == WRQ)
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tftp(tp, n);
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exit(1);
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}
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int validate_access();
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int sendfile(), recvfile();
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struct formats {
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char *f_mode;
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int (*f_validate)();
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int (*f_send)();
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int (*f_recv)();
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int f_convert;
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} formats[] = {
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{ "netascii", validate_access, sendfile, recvfile, 1 },
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{ "octet", validate_access, sendfile, recvfile, 0 },
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#ifdef notdef
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{ "mail", validate_user, sendmail, recvmail, 1 },
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#endif
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{ 0 }
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};
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int set_blksize();
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struct options {
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char *o_opt;
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int (*o_fnc)();
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} options[] = {
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{ "blksize", set_blksize },
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{ 0 }
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};
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/*
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* Set a non-standard block size (c.f. RFC1783)
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*/
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set_blksize(val, ret)
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char *val;
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char **ret;
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{
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static char b_ret[5];
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int sz = atoi(val);
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if (sz < 8) {
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if (debug)
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syslog(LOG_ERR, "Requested packetsize %d < 8\n", sz);
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return(0);
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} else if (sz > PKTSIZE-4) {
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if (debug)
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syslog(LOG_INFO, "Requested packetsize %d > %d\n",
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sz, PKTSIZE-4);
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sz = PKTSIZE-4;
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} else if (debug)
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syslog(LOG_INFO, "Adjusted packetsize to %d octets\n", sz);
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segsize = sz;
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sprintf(*ret = b_ret, "%d", sz);
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return(1);
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}
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/*
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* Parse RFC1782 style options
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*/
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do_opt(opt, val, ap)
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char *opt;
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char *val;
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char **ap;
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{
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struct options *po;
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char *ret;
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for (po = options; po->o_opt; po++)
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if (strcasecmp(po->o_opt, opt) == 0) {
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if (po->o_fnc(val, &ret)) {
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if (*ap + strlen(opt) + strlen(ret) + 2 >=
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ackbuf + sizeof(ackbuf)) {
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if (debug)
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syslog(LOG_ERR,
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"Ackbuf overflow\n");
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nak(ENOSPACE);
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exit(1);
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}
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*ap = strrchr(strcpy(strrchr(strcpy(*ap, opt),
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'\000')+1, val),
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'\000')+1;
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} else {
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nak(EOPTNEG);
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exit(1);
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}
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break;
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}
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if (debug && !po->o_opt)
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syslog(LOG_WARNING, "Unhandled option: %d = %d\n", opt, val);
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return;
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}
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/*
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* Handle initial connection protocol.
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*/
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tftp(tp, size)
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struct tftphdr *tp;
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int size;
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{
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register char *cp;
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int argn = 0, ecode;
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register struct formats *pf;
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char *filename, *mode;
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char *val, *opt;
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char *ap = ackbuf+2;
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int isopts;
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((struct tftphdr *)ackbuf)->th_opcode = ntohs(OACK);
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filename = cp = tp->th_stuff;
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again:
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while (cp < buf + size) {
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if (*cp == '\0')
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break;
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cp++;
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}
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if (*cp != '\0') {
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if (debug)
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syslog(LOG_WARNING, "Received illegal request\n");
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nak(EBADOP);
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exit(1);
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}
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if (!argn++) {
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mode = ++cp;
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goto again;
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} else {
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if (debug && argn == 3)
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syslog(LOG_INFO, "Found RFC1782 style options\n");
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*(argn & 1 ? &val : &opt) = ++cp;
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if (argn & 1)
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do_opt(opt, val, &ap);
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if (cp < buf + size && *cp != '\000')
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goto again;
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}
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for (cp = mode; *cp; cp++)
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if (isupper(*cp))
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*cp = tolower(*cp);
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for (pf = formats; pf->f_mode; pf++)
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if (strcmp(pf->f_mode, mode) == 0)
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break;
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if (pf->f_mode == 0) {
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if (debug)
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syslog(LOG_WARNING, "Unknown data format: %s\n", mode);
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nak(EBADOP);
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exit(1);
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}
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if (rootdir) {
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cp = alloca(strlen(rootdir) + strlen(filename) + 1);
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if (cp == NULL) {
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nak(100+ENOMEM);
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exit(1);
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}
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if (*filename != '/') {
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if (debug)
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syslog(LOG_ERR,
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"Filename has to be absolute: %s\n",
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filename);
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nak(EACCESS);
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exit(1);
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}
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filename = strcat(strcpy(cp, rootdir), filename);
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}
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ecode = (*pf->f_validate)(filename, tp->th_opcode);
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if (ecode) {
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nak(ecode, ERROR);
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exit(1);
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}
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isopts = ap != (ackbuf+2);
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(tp->th_opcode == WRQ ? *pf->f_recv : *pf->f_send)
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(pf, isopts ? ackbuf : NULL, isopts ? ap-ackbuf : 0);
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exit(0);
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}
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|
|
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FILE *file;
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/*
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* Validate file access. Since we
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* have no uid or gid, for now require
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* file to exist and be publicly
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* readable/writable.
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* Note also, full path name must be
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* given as we have no login directory.
|
|
*/
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validate_access(filename, mode)
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char *filename;
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int mode;
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{
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struct stat stbuf;
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int fd;
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char *cp;
|
|
|
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isfilter = 0;
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if (mode == RRQ) {
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struct filters *fp = filters;
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for (; fp; fp = fp->next) {
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if (!strcmp(fp->fname,
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filename +
|
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(rootdir ? strlen(rootdir) : 0))) {
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if (debug)
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syslog(LOG_INFO, "Opening input "
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"filter: %s\n", filename);
|
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if ((file = popen(filename, "r")) == NULL) {
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syslog(LOG_ERR, "Failed to open input "
|
|
"filter\n");
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return (EACCESS); }
|
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fd = fileno(file);
|
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isfilter = 1;
|
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return (0);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (*filename != '/') {
|
|
if (debug)
|
|
syslog(LOG_ERR, "Filename has to be absolute: %s\n",
|
|
filename);
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return (EACCESS);
|
|
}
|
|
for (cp = filename; *cp; cp++)
|
|
if (*cp == '~' || *cp == '$' ||
|
|
(*cp == '/' && cp[1] == '.' && cp[2] == '.')) {
|
|
if (debug)
|
|
syslog(LOG_ERR, "Illegal filename: %s\n",
|
|
filename);
|
|
return (EACCESS);
|
|
}
|
|
if (debug)
|
|
syslog(LOG_INFO, "Validating \"%s\" for %sing\n",
|
|
filename, mode == RRQ ? "read" : "writ");
|
|
if (stat(filename, &stbuf) < 0)
|
|
return (errno == ENOENT ? ENOTFOUND : EACCESS);
|
|
if (mode == RRQ) {
|
|
if ((stbuf.st_mode&(S_IREAD >> 6)) == 0)
|
|
return (EACCESS);
|
|
} else {
|
|
if ((stbuf.st_mode&(S_IWRITE >> 6)) == 0)
|
|
return (EACCESS);
|
|
}
|
|
fd = open(filename, mode == RRQ ? 0 : 1);
|
|
if (fd < 0)
|
|
return (errno + 100);
|
|
file = fdopen(fd, (mode == RRQ)? "r":"w");
|
|
if (file == NULL) {
|
|
return errno+100;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int timeout;
|
|
jmp_buf timeoutbuf;
|
|
|
|
void timer(int sig)
|
|
{
|
|
|
|
timeout += rexmtval;
|
|
if (timeout >= maxtimeout) {
|
|
if (debug)
|
|
syslog(LOG_WARNING, "Timeout!\n");
|
|
exit(1);
|
|
}
|
|
longjmp(timeoutbuf, 1);
|
|
}
|
|
|
|
/*
|
|
* Send the requested file.
|
|
*/
|
|
sendfile(pf, oap, oacklen)
|
|
struct formats *pf;
|
|
struct tftphdr *oap;
|
|
int oacklen;
|
|
{
|
|
struct tftphdr *dp, *r_init();
|
|
register struct tftphdr *ap; /* ack packet */
|
|
register int size, n;
|
|
u_short block = 1;
|
|
|
|
signal(SIGALRM, timer);
|
|
|
|
ap = (struct tftphdr *)ackbuf;
|
|
|
|
if (oap) {
|
|
timeout = 0;
|
|
(void) setjmp(timeoutbuf);
|
|
oack:
|
|
if (send(peer, oap, oacklen, 0) != oacklen) {
|
|
syslog(LOG_ERR, "tftpd: write: %m\n");
|
|
goto abort;
|
|
}
|
|
for ( ; ; ) {
|
|
alarm(rexmtval);
|
|
n = recv(peer, ackbuf, sizeof (ackbuf), 0);
|
|
alarm(0);
|
|
if (n < 0) {
|
|
syslog(LOG_ERR, "tftpd: read: %m\n");
|
|
goto abort;
|
|
}
|
|
ap->th_opcode = ntohs((u_short)ap->th_opcode);
|
|
ap->th_block = ntohs(ap->th_block);
|
|
|
|
if (ap->th_opcode == ERROR) {
|
|
if (debug)
|
|
syslog(LOG_ERR, "Client does not "
|
|
"accept options\n");
|
|
goto abort; }
|
|
|
|
if (ap->th_opcode == ACK) {
|
|
if (ap->th_block == 0) {
|
|
if (debug)
|
|
syslog(LOG_DEBUG,
|
|
"RFC1782 option "
|
|
"negotiation "
|
|
"succeeded\n");
|
|
break;
|
|
}
|
|
/* Re-synchronize with the other side */
|
|
(void) synchnet(peer);
|
|
goto oack;
|
|
}
|
|
}
|
|
}
|
|
|
|
dp = r_init();
|
|
do {
|
|
size = readit(file, &dp, pf->f_convert);
|
|
if (size < 0) {
|
|
nak(errno + 100);
|
|
goto abort;
|
|
}
|
|
dp->th_opcode = htons((u_short)DATA);
|
|
dp->th_block = htons(block);
|
|
timeout = 0;
|
|
(void) setjmp(timeoutbuf);
|
|
|
|
send_data:
|
|
if (send(peer, dp, size + 4, 0) != size + 4) {
|
|
syslog(LOG_ERR, "tftpd: write: %m\n");
|
|
goto abort;
|
|
}
|
|
read_ahead(file, pf->f_convert);
|
|
for ( ; ; ) {
|
|
alarm(rexmtval); /* read the ack */
|
|
n = recv(peer, ackbuf, sizeof (ackbuf), 0);
|
|
alarm(0);
|
|
if (n < 0) {
|
|
syslog(LOG_ERR, "tftpd: read: %m\n");
|
|
goto abort;
|
|
}
|
|
ap->th_opcode = ntohs((u_short)ap->th_opcode);
|
|
ap->th_block = ntohs(ap->th_block);
|
|
|
|
if (ap->th_opcode == ERROR)
|
|
goto abort;
|
|
|
|
if (ap->th_opcode == ACK) {
|
|
if (ap->th_block == block) {
|
|
break;
|
|
}
|
|
/* Re-synchronize with the other side */
|
|
(void) synchnet(peer);
|
|
if (ap->th_block == (block -1)) {
|
|
goto send_data;
|
|
}
|
|
}
|
|
|
|
}
|
|
block++;
|
|
} while (size == segsize);
|
|
abort:
|
|
if (isfilter)
|
|
pclose(file);
|
|
else
|
|
(void) fclose(file);
|
|
isfilter = 0;
|
|
}
|
|
|
|
void justquit(int sig)
|
|
{
|
|
exit(0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Receive a file.
|
|
*/
|
|
recvfile(pf, oap, oacklen)
|
|
struct formats *pf;
|
|
struct tftphdr *oap;
|
|
int oacklen;
|
|
{
|
|
struct tftphdr *dp, *w_init();
|
|
register struct tftphdr *ap; /* ack buffer */
|
|
register int acksize, n, size;
|
|
u_short block = 0;
|
|
|
|
signal(SIGALRM, timer);
|
|
dp = w_init();
|
|
do {
|
|
timeout = 0;
|
|
|
|
if (!block++ && oap) {
|
|
ap = (struct tftphdr *)oap;
|
|
acksize = oacklen;
|
|
} else {
|
|
ap = (struct tftphdr *)ackbuf;
|
|
ap->th_opcode = htons((u_short)ACK);
|
|
ap->th_block = htons(block-1);
|
|
acksize = 4;
|
|
}
|
|
(void) setjmp(timeoutbuf);
|
|
send_ack:
|
|
if (send(peer, (char *)ap, acksize, 0) != acksize) {
|
|
syslog(LOG_ERR, "tftpd: write: %m\n");
|
|
goto abort;
|
|
}
|
|
write_behind(file, pf->f_convert);
|
|
for ( ; ; ) {
|
|
alarm(rexmtval);
|
|
n = recv(peer, dp, segsize+4, 0);
|
|
alarm(0);
|
|
if (n < 0) { /* really? */
|
|
syslog(LOG_ERR, "tftpd: read: %m\n");
|
|
goto abort;
|
|
}
|
|
dp->th_opcode = ntohs((u_short)dp->th_opcode);
|
|
dp->th_block = ntohs(dp->th_block);
|
|
if (dp->th_opcode == ERROR)
|
|
goto abort;
|
|
if (dp->th_opcode == DATA) {
|
|
if (dp->th_block == block) {
|
|
break; /* normal */
|
|
}
|
|
/* Re-synchronize with the other side */
|
|
(void) synchnet(peer);
|
|
if (dp->th_block == (block-1))
|
|
goto send_ack; /* rexmit */
|
|
}
|
|
}
|
|
/* size = write(file, dp->th_data, n - 4); */
|
|
size = writeit(file, &dp, n - 4, pf->f_convert);
|
|
if (size != (n-4)) { /* ahem */
|
|
if (size < 0) nak(errno + 100);
|
|
else nak(ENOSPACE);
|
|
goto abort;
|
|
}
|
|
} while (size == segsize);
|
|
write_behind(file, pf->f_convert);
|
|
if (isfilter)
|
|
pclose(file);
|
|
else
|
|
(void) fclose(file); /* close data file */
|
|
isfilter = 0;
|
|
|
|
ap = (struct tftphdr *)ackbuf;
|
|
ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
|
|
ap->th_block = htons(block);
|
|
(void) send(peer, ackbuf, 4, 0);
|
|
|
|
signal(SIGALRM, justquit); /* just quit on timeout */
|
|
alarm(rexmtval);
|
|
n = recv(peer, buf, segsize, 0); /* normally times out and quits */
|
|
alarm(0);
|
|
if (n >= 4 && /* if read some data */
|
|
dp->th_opcode == DATA && /* and got a data block */
|
|
block == dp->th_block) { /* then my last ack was lost */
|
|
(void) send(peer, ackbuf, 4, 0); /* resend final ack */
|
|
}
|
|
abort:
|
|
return;
|
|
}
|
|
|
|
struct errmsg {
|
|
int e_code;
|
|
const char *e_msg;
|
|
} errmsgs[] = {
|
|
{ EUNDEF, "Undefined error code" },
|
|
{ ENOTFOUND, "File not found" },
|
|
{ EACCESS, "Access violation" },
|
|
{ ENOSPACE, "Disk full or allocation exceeded" },
|
|
{ EBADOP, "Illegal TFTP operation" },
|
|
{ EBADID, "Unknown transfer ID" },
|
|
{ EEXISTS, "File already exists" },
|
|
{ ENOUSER, "No such user" },
|
|
{ EOPTNEG, "Failure to negotiate RFC1782 options" },
|
|
{ -1, 0 }
|
|
};
|
|
|
|
/*
|
|
* Send a nak packet (error message).
|
|
* Error code passed in is one of the
|
|
* standard TFTP codes, or a UNIX errno
|
|
* offset by 100.
|
|
*/
|
|
nak(error)
|
|
int error;
|
|
{
|
|
register struct tftphdr *tp;
|
|
int length;
|
|
register struct errmsg *pe;
|
|
/* extern char *sys_errlist[]; */
|
|
|
|
tp = (struct tftphdr *)buf;
|
|
tp->th_opcode = htons((u_short)ERROR);
|
|
tp->th_code = htons((u_short)error);
|
|
for (pe = errmsgs; pe->e_code >= 0; pe++)
|
|
if (pe->e_code == error)
|
|
break;
|
|
if (pe->e_code < 0) {
|
|
pe->e_msg = sys_errlist[error -100];
|
|
tp->th_code = EUNDEF; /* set 'undef' errorcode */
|
|
}
|
|
strcpy(tp->th_msg, pe->e_msg);
|
|
length = strlen(pe->e_msg);
|
|
tp->th_msg[length] = '\0';
|
|
length += 5;
|
|
if (debug)
|
|
syslog(LOG_ERR, "Negative acknowledge: %s\n", tp->th_msg);
|
|
if (send(peer, buf, length, 0) != length)
|
|
syslog(LOG_ERR, "nak: %m\n");
|
|
}
|