773 lines
18 KiB
C
773 lines
18 KiB
C
/* $NetBSD: tftp.c,v 1.36 2016/09/03 06:00:32 dholland Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: tftp.c,v 1.36 2016/09/03 06:00:32 dholland Exp $");
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#endif
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#endif /* not lint */
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/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
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/*
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* TFTP User Program -- Protocol Machines
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/tftp.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <netdb.h>
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#include "extern.h"
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#include "tftpsubs.h"
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extern jmp_buf toplevel;
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char ackbuf[PKTSIZE];
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int timeout;
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jmp_buf timeoutbuf;
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static void nak(int, struct sockaddr *);
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static int makerequest(int, const char *, struct tftphdr *, const char *, off_t);
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static void printstats(const char *, unsigned long);
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static void startclock(void);
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static void stopclock(void);
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static __dead void timer(int);
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static void tpacket(const char *, struct tftphdr *, int);
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static int cmpport(struct sockaddr *, struct sockaddr *);
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static void get_options(struct tftphdr *, int);
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static int tftp_igmp_join(void);
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static void tftp_igmp_leave(int);
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static void
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get_options(struct tftphdr *ap, int size)
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{
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unsigned long val;
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char *opt, *endp, *nextopt, *valp;
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int l;
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size -= 2; /* skip over opcode */
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opt = ap->th_stuff;
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endp = opt + size - 1;
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*endp = '\0';
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while (opt < endp) {
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int ismulticast;
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l = strlen(opt) + 1;
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valp = opt + l;
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ismulticast = !strcasecmp(opt, "multicast");
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if (valp < endp) {
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val = strtoul(valp, NULL, 10);
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l = strlen(valp) + 1;
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nextopt = valp + l;
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if (!ismulticast) {
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if (val == ULONG_MAX && errno == ERANGE) {
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/* Report illegal value */
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opt = nextopt;
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continue;
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}
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}
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} else {
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/* Badly formed OACK */
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break;
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}
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if (strcmp(opt, "tsize") == 0) {
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/* cool, but we'll ignore it */
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} else if (strcmp(opt, "timeout") == 0) {
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if (val >= 1 && val <= 255) {
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rexmtval = val;
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} else {
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/* Report error? */
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}
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} else if (strcmp(opt, "blksize") == 0) {
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if (val >= 8 && val <= MAXSEGSIZE) {
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blksize = val;
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} else {
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/* Report error? */
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}
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} else if (ismulticast) {
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char multicast[24];
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char *pmulticast;
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char *addr;
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strlcpy(multicast, valp, sizeof(multicast));
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pmulticast = multicast;
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addr = strsep(&pmulticast, ",");
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if (pmulticast == NULL)
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continue; /* Report error? */
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mcport = atoi(strsep(&pmulticast, ","));
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if (pmulticast == NULL)
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continue; /* Report error? */
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mcmasterslave = atoi(pmulticast);
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mcaddr = inet_addr(addr);
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if (mcaddr == INADDR_NONE)
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continue; /* Report error? */
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} else {
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/* unknown option */
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}
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opt = nextopt;
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}
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}
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static int
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tftp_igmp_join(void)
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{
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struct ip_mreq req;
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struct sockaddr_in s;
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int fd, rv;
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memset(&req, 0, sizeof(struct ip_mreq));
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req.imr_multiaddr.s_addr = mcaddr;
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req.imr_interface.s_addr = INADDR_ANY;
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fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (fd < 0) {
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perror("socket");
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return fd;
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}
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memset(&s, 0, sizeof(struct sockaddr_in));
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s.sin_family = AF_INET;
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s.sin_port = htons(mcport);
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s.sin_len = sizeof(struct sockaddr_in);
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rv = bind(fd, (struct sockaddr *)&s, sizeof(struct sockaddr_in));
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if (rv < 0) {
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perror("bind");
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close(fd);
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return rv;
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}
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rv = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req,
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sizeof(struct ip_mreq));
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if (rv < 0) {
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perror("setsockopt");
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close(fd);
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return rv;
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}
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return fd;
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}
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static void
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tftp_igmp_leave(int fd)
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{
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struct ip_mreq req;
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int rv;
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memset(&req, 0, sizeof(struct ip_mreq));
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req.imr_multiaddr.s_addr = mcaddr;
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req.imr_interface.s_addr = INADDR_ANY;
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rv = setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &req,
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sizeof(struct ip_mreq));
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if (rv < 0)
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perror("setsockopt");
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close(fd);
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return;
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}
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/*
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* Send the requested file.
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*/
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void
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sendfile(int fd, const char *name, const char *mode)
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{
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struct tftphdr *ap; /* data and ack packets */
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struct tftphdr *dp;
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int j, n;
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volatile unsigned int block;
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volatile int size, convert;
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volatile unsigned long amount;
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struct sockaddr_storage from;
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struct stat sbuf;
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volatile off_t filesize = 0;
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socklen_t fromlen;
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FILE *file;
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struct sockaddr_storage peer;
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struct sockaddr_storage serv; /* valid server port number */
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startclock(); /* start stat's clock */
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dp = r_init(); /* reset fillbuf/read-ahead code */
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ap = (struct tftphdr *)(void *)ackbuf;
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if (tsize) {
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if (fstat(fd, &sbuf) == 0) {
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filesize = sbuf.st_size;
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} else {
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filesize = -1ULL;
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}
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}
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file = fdopen(fd, "r");
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convert = !strcmp(mode, "netascii");
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block = 0;
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amount = 0;
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(void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len);
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(void)memset(&serv, 0, sizeof(serv));
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(void)signal(SIGALRM, timer);
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do {
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if (block == 0)
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size = makerequest(WRQ, name, dp, mode, filesize) - 4;
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else {
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/* size = read(fd, dp->th_data, SEGSIZE); */
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size = readit(file, &dp, blksize, convert);
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if (size < 0) {
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nak(errno + 100, (struct sockaddr *)(void *)&peer);
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break;
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}
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dp->th_opcode = htons((u_short)DATA);
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dp->th_block = htons((u_short)block);
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}
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timeout = 0;
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(void) setjmp(timeoutbuf);
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send_data:
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if (trace)
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tpacket("sent", dp, size + 4);
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n = sendto(f, dp, (socklen_t)(size + 4), 0,
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(struct sockaddr *)(void *)&peer, (socklen_t)peer.ss_len);
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if (n != size + 4) {
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warn("sendto");
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goto abort;
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}
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if (block)
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read_ahead(file, blksize, convert);
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for ( ; ; ) {
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(void)alarm(rexmtval);
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do {
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int curf;
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fromlen = sizeof(from);
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if (mcaddr != INADDR_NONE)
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curf = mf;
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else
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curf = f;
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n = recvfrom(curf, ackbuf, sizeof(ackbuf), 0,
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(struct sockaddr *)(void *)&from, &fromlen);
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} while (n <= 0);
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(void)alarm(0);
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if (n < 0) {
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warn("recvfrom");
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goto abort;
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}
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if (!serv.ss_family)
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serv = from;
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else if (!cmpport((struct sockaddr *)(void *)&serv,
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(struct sockaddr *)(void *)&from)) {
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warn("server port mismatch");
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goto abort;
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}
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peer = from;
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if (trace)
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tpacket("received", ap, n);
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/* should verify packet came from server */
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ap->th_opcode = ntohs(ap->th_opcode);
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if (ap->th_opcode == ERROR) {
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(void)printf("Error code %d: %s\n", ap->th_code,
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ap->th_msg);
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goto abort;
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}
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if (ap->th_opcode == ACK) {
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ap->th_block = ntohs(ap->th_block);
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if (ap->th_block == 0) {
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/*
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* If the extended options are enabled,
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* the server just refused 'em all.
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* The only one that _really_
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* matters is blksize, but we'll
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* clear timeout and mcaddr, too.
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*/
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blksize = def_blksize;
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rexmtval = def_rexmtval;
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mcaddr = INADDR_NONE;
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}
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if (ap->th_block == block) {
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break;
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}
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/* On an error, try to synchronize
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* both sides.
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*/
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j = synchnet(f, blksize+4);
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if (j && trace) {
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(void)printf("discarded %d packets\n",
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j);
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}
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if (ap->th_block == (block-1)) {
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goto send_data;
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}
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}
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if (ap->th_opcode == OACK) {
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if (block == 0) {
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blksize = def_blksize;
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rexmtval = def_rexmtval;
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mcaddr = INADDR_NONE;
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get_options(ap, n);
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break;
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}
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}
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}
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if (block > 0)
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amount += size;
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block++;
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} while ((size_t)size == blksize || block == 1);
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abort:
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(void)fclose(file);
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stopclock();
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if (amount > 0)
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printstats("Sent", amount);
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}
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/*
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* Receive a file.
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*/
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void
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recvfile(int fd, const char *name, const char *mode)
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{
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struct tftphdr *ap;
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struct tftphdr *dp;
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int j, n;
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volatile int oack = 0;
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volatile unsigned int block;
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volatile int size, firsttrip;
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volatile unsigned long amount;
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struct sockaddr_storage from;
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socklen_t fromlen;
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volatile size_t readlen;
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FILE *file;
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volatile int convert; /* true if converting crlf -> lf */
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struct sockaddr_storage peer;
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struct sockaddr_storage serv; /* valid server port number */
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startclock();
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dp = w_init();
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ap = (struct tftphdr *)(void *)ackbuf;
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file = fdopen(fd, "w");
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convert = !strcmp(mode, "netascii");
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block = 1;
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firsttrip = 1;
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amount = 0;
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(void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len);
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(void)memset(&serv, 0, sizeof(serv));
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(void)signal(SIGALRM, timer);
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do {
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if (firsttrip) {
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size = makerequest(RRQ, name, ap, mode, (off_t)0);
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readlen = PKTSIZE;
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firsttrip = 0;
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} else {
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ap->th_opcode = htons((u_short)ACK);
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ap->th_block = htons((u_short)(block));
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readlen = blksize+4;
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size = 4;
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block++;
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}
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timeout = 0;
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(void) setjmp(timeoutbuf);
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send_ack:
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if (trace)
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tpacket("sent", ap, size);
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if (sendto(f, ackbuf, (socklen_t)size, 0,
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(struct sockaddr *)(void *)&peer,
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(socklen_t)peer.ss_len) != size) {
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(void)alarm(0);
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warn("sendto");
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goto abort;
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}
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skip_ack:
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if (write_behind(file, convert) == -1)
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goto abort;
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for ( ; ; ) {
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(void)alarm(rexmtval);
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do {
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int readfd;
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if (mf > 0)
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readfd = mf;
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else
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readfd = f;
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fromlen = sizeof(from);
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n = recvfrom(readfd, dp, readlen, 0,
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(struct sockaddr *)(void *)&from, &fromlen);
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} while (n <= 0);
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(void)alarm(0);
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if (n < 0) {
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warn("recvfrom");
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goto abort;
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}
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if (!serv.ss_family)
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serv = from;
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else if (!cmpport((struct sockaddr *)(void *)&serv,
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(struct sockaddr *)(void *)&from)) {
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warn("server port mismatch");
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goto abort;
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}
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peer = from;
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if (trace)
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tpacket("received", dp, n);
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/* should verify client address */
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dp->th_opcode = ntohs(dp->th_opcode);
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if (dp->th_opcode == ERROR) {
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(void)printf("Error code %d: %s\n", dp->th_code,
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dp->th_msg);
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goto abort;
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}
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if (dp->th_opcode == DATA) {
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dp->th_block = ntohs(dp->th_block);
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if (dp->th_block == 1 && !oack) {
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/* no OACK, revert to defaults */
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blksize = def_blksize;
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rexmtval = def_rexmtval;
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}
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if (dp->th_block == block) {
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break; /* have next packet */
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}
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/* On an error, try to synchronize
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* both sides.
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*/
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j = synchnet(f, blksize);
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if (j && trace) {
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(void)printf("discarded %d packets\n", j);
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}
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if (dp->th_block == (block-1)) {
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goto send_ack; /* resend ack */
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}
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}
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if (dp->th_opcode == OACK) {
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if (block == 1) {
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oack = 1;
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blksize = def_blksize;
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rexmtval = def_rexmtval;
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get_options(dp, n);
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ap->th_opcode = htons(ACK);
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ap->th_block = 0;
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readlen = blksize+4;
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size = 4;
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if (mcaddr != INADDR_NONE) {
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mf = tftp_igmp_join();
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if (mf < 0)
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goto abort;
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if (mcmasterslave == 0)
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goto skip_ack;
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}
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goto send_ack;
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}
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}
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}
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/* size = write(fd, dp->th_data, n - 4); */
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size = writeit(file, &dp, n - 4, convert);
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if (size < 0) {
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nak(errno + 100, (struct sockaddr *)(void *)&peer);
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break;
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}
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amount += size;
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} while ((size_t)size == blksize);
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abort: /* ok to ack, since user */
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ap->th_opcode = htons((u_short)ACK); /* has seen err msg */
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ap->th_block = htons((u_short)block);
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if (mcaddr != INADDR_NONE && mf >= 0) {
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tftp_igmp_leave(mf);
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mf = -1;
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}
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(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)(void *)&peer,
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(socklen_t)peer.ss_len);
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/*
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* flush last buffer
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* We do not check for failure because last buffer
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* can be empty, thus returning an error.
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* XXX maybe we should fix 'write_behind' instead.
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*/
|
|
(void)write_behind(file, convert);
|
|
(void)fclose(file);
|
|
stopclock();
|
|
if (amount > 0)
|
|
printstats("Received", amount);
|
|
}
|
|
|
|
static int
|
|
makerequest(int request, const char *name, struct tftphdr *tp, const char *mode,
|
|
off_t filesize)
|
|
{
|
|
char *cp;
|
|
|
|
tp->th_opcode = htons((u_short)request);
|
|
#ifndef __SVR4
|
|
cp = tp->th_stuff;
|
|
#else
|
|
cp = (void *)&tp->th_stuff;
|
|
#endif
|
|
(void)strcpy(cp, name);
|
|
cp += strlen(name);
|
|
*cp++ = '\0';
|
|
(void)strcpy(cp, mode);
|
|
cp += strlen(mode);
|
|
*cp++ = '\0';
|
|
if (tsize) {
|
|
(void)strcpy(cp, "tsize");
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
(void)sprintf(cp, "%lu", (unsigned long) filesize);
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
}
|
|
if (tout) {
|
|
(void)strcpy(cp, "timeout");
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
(void)sprintf(cp, "%d", rexmtval);
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
}
|
|
if (blksize != SEGSIZE) {
|
|
(void)strcpy(cp, "blksize");
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
(void)sprintf(cp, "%zd", blksize);
|
|
cp += strlen(cp);
|
|
*cp++ = '\0';
|
|
}
|
|
return (cp - (char *)(void *)tp);
|
|
}
|
|
|
|
const 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, "Option negotiation failed" },
|
|
{ -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.
|
|
*/
|
|
static void
|
|
nak(int error, struct sockaddr *peer)
|
|
{
|
|
const struct errmsg *pe;
|
|
struct tftphdr *tp;
|
|
int length;
|
|
size_t msglen;
|
|
|
|
tp = (struct tftphdr *)(void *)ackbuf;
|
|
tp->th_opcode = htons((u_short)ERROR);
|
|
msglen = sizeof(ackbuf) - (&tp->th_msg[0] - ackbuf);
|
|
for (pe = errmsgs; pe->e_code >= 0; pe++)
|
|
if (pe->e_code == error)
|
|
break;
|
|
if (pe->e_code < 0) {
|
|
tp->th_code = EUNDEF;
|
|
(void)strlcpy(tp->th_msg, strerror(error - 100), msglen);
|
|
} else {
|
|
tp->th_code = htons((u_short)error);
|
|
(void)strlcpy(tp->th_msg, pe->e_msg, msglen);
|
|
}
|
|
length = strlen(tp->th_msg);
|
|
msglen = &tp->th_msg[length + 1] - ackbuf;
|
|
if (trace)
|
|
tpacket("sent", tp, (int)msglen);
|
|
if ((size_t)sendto(f, ackbuf, msglen, 0, peer, (socklen_t)peer->sa_len) != msglen)
|
|
warn("nak");
|
|
}
|
|
|
|
static void
|
|
tpacket(const char *s, struct tftphdr *tp, int n)
|
|
{
|
|
static const char *opcodes[] =
|
|
{ "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR", "OACK" };
|
|
char *cp, *file, *endp, *opt = NULL;
|
|
const char *spc;
|
|
u_short op = ntohs(tp->th_opcode);
|
|
int i, o;
|
|
|
|
if (op < RRQ || op > OACK)
|
|
(void)printf("%s opcode=%x ", s, op);
|
|
else
|
|
(void)printf("%s %s ", s, opcodes[op]);
|
|
switch (op) {
|
|
|
|
case RRQ:
|
|
case WRQ:
|
|
n -= 2;
|
|
#ifndef __SVR4
|
|
cp = tp->th_stuff;
|
|
#else
|
|
cp = (void *) &tp->th_stuff;
|
|
#endif
|
|
endp = cp + n - 1;
|
|
if (*endp != '\0') { /* Shouldn't happen, but... */
|
|
*endp = '\0';
|
|
}
|
|
file = cp;
|
|
cp = strchr(cp, '\0') + 1;
|
|
(void)printf("<file=%s, mode=%s", file, cp);
|
|
cp = strchr(cp, '\0') + 1;
|
|
o = 0;
|
|
while (cp < endp) {
|
|
i = strlen(cp) + 1;
|
|
if (o) {
|
|
(void)printf(", %s=%s", opt, cp);
|
|
} else {
|
|
opt = cp;
|
|
}
|
|
o = (o+1) % 2;
|
|
cp += i;
|
|
}
|
|
(void)printf(">\n");
|
|
break;
|
|
|
|
case DATA:
|
|
(void)printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4);
|
|
break;
|
|
|
|
case ACK:
|
|
(void)printf("<block=%d>\n", ntohs(tp->th_block));
|
|
break;
|
|
|
|
case ERROR:
|
|
(void)printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg);
|
|
break;
|
|
|
|
case OACK:
|
|
o = 0;
|
|
n -= 2;
|
|
cp = tp->th_stuff;
|
|
endp = cp + n - 1;
|
|
if (*endp != '\0') { /* Shouldn't happen, but... */
|
|
*endp = '\0';
|
|
}
|
|
(void)printf("<");
|
|
spc = "";
|
|
while (cp < endp) {
|
|
i = strlen(cp) + 1;
|
|
if (o) {
|
|
(void)printf("%s%s=%s", spc, opt, cp);
|
|
spc = ", ";
|
|
} else {
|
|
opt = cp;
|
|
}
|
|
o = (o+1) % 2;
|
|
cp += i;
|
|
}
|
|
(void)printf(">\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
struct timeval tstart;
|
|
struct timeval tstop;
|
|
|
|
static void
|
|
startclock(void)
|
|
{
|
|
|
|
(void)gettimeofday(&tstart, NULL);
|
|
}
|
|
|
|
static void
|
|
stopclock(void)
|
|
{
|
|
|
|
(void)gettimeofday(&tstop, NULL);
|
|
}
|
|
|
|
static void
|
|
printstats(const char *direction, unsigned long amount)
|
|
{
|
|
double delta;
|
|
|
|
/* compute delta in 1/10's second units */
|
|
delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) -
|
|
((tstart.tv_sec*10.)+(tstart.tv_usec/100000));
|
|
delta = delta/10.; /* back to seconds */
|
|
(void)printf("%s %ld bytes in %.1f seconds", direction, amount, delta);
|
|
if (verbose)
|
|
(void)printf(" [%.0f bits/sec]", (amount*8.)/delta);
|
|
(void)putchar('\n');
|
|
}
|
|
|
|
static void
|
|
/*ARGSUSED*/
|
|
timer(int sig)
|
|
{
|
|
|
|
timeout += rexmtval;
|
|
if (timeout >= maxtimeout) {
|
|
(void)printf("Transfer timed out.");
|
|
longjmp(toplevel, -1);
|
|
}
|
|
longjmp(timeoutbuf, 1);
|
|
}
|
|
|
|
static int
|
|
cmpport(struct sockaddr *sa, struct sockaddr *sb)
|
|
{
|
|
char a[NI_MAXSERV], b[NI_MAXSERV];
|
|
|
|
if (getnameinfo(sa, (socklen_t)sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV))
|
|
return 0;
|
|
if (getnameinfo(sb, (socklen_t)sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV))
|
|
return 0;
|
|
if (strcmp(a, b) != 0)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|