Hi all, I am using perl and Perl/Tk do develop a small software installer which
uses DHCP,FTP and TFTP, it works fine but a great enhencement of this software
could be the implementation of a progress bar with 3 differents colors to show
the progression of the the 3 services used(DHCP,FTP,TFTP),How can I do this?
I am under windows 98 and use cygwin environemnt (a port of GNu tools over
Windows).U can see a attachment the tftp that i use.
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/* Many bug fixes are from Jim Guyton <guyton@rand-unix> */
/*
* TFTP User Program -- Protocol Machines
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <netinet/in.h>
#include <arpa/tftp.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#include "tftpsubs.h"
#ifndef HAVE_ERRNO_DECL
extern int errno;
#endif
#ifndef HAVE_STRERROR_DECL
extern const char *strerror __P ((int));
#endif
extern struct sockaddr_in peeraddr; /* filled in by main */
extern int f; /* the opened socket */
extern int trace;
extern int verbose;
extern int rexmtval;
extern int maxtimeout;
#define PKTSIZE SEGSIZE+4
char ackbuf[PKTSIZE];
int timeout;
jmp_buf timeoutbuf;
static void nak __P((int));
static int makerequest __P((int, const char *, struct tftphdr *, const char *));
static void printstats __P((const char *, unsigned long));
static void startclock __P((void));
static void stopclock __P((void));
static void timer __P((int));
static void tpacket __P((const char *, struct tftphdr *, int));
/*
* Send the requested file.
*/
void
sendfile(fd, name, mode)
int fd;
char *name;
char *mode;
{
register struct tftphdr *ap; /* data and ack packets */
struct tftphdr *r_init(), *dp;
register int n;
volatile int block, size, convert;
volatile unsigned long amount;
struct sockaddr_in from;
int fromlen;
FILE *file;
startclock(); /* start stat's clock */
dp = r_init(); /* reset fillbuf/read-ahead code */
ap = (struct tftphdr *)ackbuf;
#ifdef __CYGWIN__
file = fdopen(fd, "rb");
#else
file = fdopen(fd, "r");
#endif
convert = !strcmp(mode, "netascii");
block = 0;
amount = 0;
signal(SIGALRM, timer);
do {
if (block == 0)
size = makerequest(WRQ, name, dp, mode) - 4;
else {
/* size = read(fd, dp->th_data, SEGSIZE); */
size = readit(file, &dp, convert);
if (size < 0) {
nak(errno + 100);
break;
}
dp->th_opcode = htons((u_short)DATA);
dp->th_block = htons((u_short)block);
}
timeout = 0;
(void) setjmp(timeoutbuf);
send_data:
if (trace)
tpacket("sent", dp, size + 4);
n = sendto(f, (const char *)dp, size + 4, 0,
(struct sockaddr *)&peeraddr, sizeof(peeraddr));
if (n != size + 4) {
perror("tftp: sendto");
goto abort;
}
read_ahead(file, convert);
for ( ; ; ) {
alarm(rexmtval);
do {
fromlen = sizeof(from);
n = recvfrom(f, ackbuf, sizeof(ackbuf), 0,
(struct sockaddr *)&from, &fromlen);
} while (n <= 0);
alarm(0);
if (n < 0) {
perror("tftp: recvfrom");
goto abort;
}
peeraddr.sin_port = from.sin_port; /* added */
if (trace)
tpacket("received", ap, n);
/* should verify packet came from server */
ap->th_opcode = ntohs(ap->th_opcode);
ap->th_block = ntohs(ap->th_block);
if (ap->th_opcode == ERROR) {
printf("Error code %d: %s\n", ap->th_code,
ap->th_msg);
goto abort;
}
if (ap->th_opcode == ACK) {
int j;
if (ap->th_block == block) {
break;
}
/* On an error, try to synchronize
* both sides.
*/
j = synchnet(f);
if (j && trace) {
printf("discarded %d packets\n",
j);
}
if (ap->th_block == (block-1)) {
goto send_data;
}
}
}
if (block > 0)
amount += size;
block++;
} while (size == SEGSIZE || block == 1);
abort:
fclose(file);
stopclock();
if (amount > 0)
printstats("Sent", amount);
}
/*
* Receive a file.
*/
void
recvfile(fd, name, mode)
int fd;
char *name;
char *mode;
{
register struct tftphdr *ap;
struct tftphdr *dp, *w_init();
register int n;
volatile int block, size, firsttrip;
volatile unsigned long amount;
struct sockaddr_in from;
int fromlen;
FILE *file;
volatile int convert; /* true if converting crlf -> lf */
startclock();
dp = w_init();
ap = (struct tftphdr *)ackbuf;
#ifdef __CYGWIN__
file = fdopen(fd, "wb");
#else
file = fdopen(fd, "w");
#endif
convert = !strcmp(mode, "netascii");
block = 1;
firsttrip = 1;
amount = 0;
signal(SIGALRM, timer);
do {
if (firsttrip) {
size = makerequest(RRQ, name, ap, mode);
firsttrip = 0;
} else {
ap->th_opcode = htons((u_short)ACK);
ap->th_block = htons((u_short)(block));
size = 4;
block++;
}
timeout = 0;
(void) setjmp(timeoutbuf);
send_ack:
if (trace)
tpacket("sent", ap, size);
if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peeraddr,
sizeof(peeraddr)) != size) {
alarm(0);
perror("tftp: sendto");
goto abort;
}
write_behind(file, convert);
for ( ; ; ) {
alarm(rexmtval);
do {
fromlen = sizeof(from);
n = recvfrom(f, (char *)dp, PKTSIZE, 0,
(struct sockaddr *)&from, &fromlen);
} while (n <= 0);
alarm(0);
if (n < 0) {
perror("tftp: recvfrom");
goto abort;
}
peeraddr.sin_port = from.sin_port; /* added */
if (trace)
tpacket("received", dp, n);
/* should verify client address */
dp->th_opcode = ntohs(dp->th_opcode);
dp->th_block = ntohs(dp->th_block);
if (dp->th_opcode == ERROR) {
printf("Error code %d: %s\n", dp->th_code,
dp->th_msg);
goto abort;
}
if (dp->th_opcode == DATA) {
int j;
if (dp->th_block == block) {
break; /* have next packet */
}
/* On an error, try to synchronize
* both sides.
*/
j = synchnet(f);
if (j && trace) {
printf("discarded %d packets\n", j);
}
if (dp->th_block == (block-1)) {
goto send_ack; /* resend ack */
}
}
}
/* size = write(fd, dp->th_data, n - 4); */
size = writeit(file, &dp, n - 4, convert);
if (size < 0) {
nak(errno + 100);
break;
}
amount += size;
} while (size == SEGSIZE);
abort: /* ok to ack, since user */
ap->th_opcode = htons((u_short)ACK); /* has seen err msg */
ap->th_block = htons((u_short)block);
(void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peeraddr,
sizeof(peeraddr));
write_behind(file, convert); /* flush last buffer */
fclose(file);
stopclock();
if (amount > 0)
printstats("Received", amount);
}
static int
makerequest(request, name, tp, mode)
int request;
const char *name;
struct tftphdr *tp;
const char *mode;
{
register char *cp;
tp->th_opcode = htons((u_short)request);
cp = tp->th_stuff;
strcpy(cp, name);
cp += strlen(name);
*cp++ = '\0';
strcpy(cp, mode);
cp += strlen(mode);
*cp++ = '\0';
return (cp - (char *)tp);
}
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" },
{ -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(error)
int error;
{
register struct errmsg *pe;
register struct tftphdr *tp;
int length;
tp = (struct tftphdr *)ackbuf;
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 = strerror(error - 100);
tp->th_code = EUNDEF;
}
strcpy(tp->th_msg, pe->e_msg);
length = strlen(pe->e_msg) + 4;
if (trace)
tpacket("sent", tp, length);
if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&peeraddr,
sizeof(peeraddr)) != length)
perror("nak");
}
static void
tpacket(s, tp, n)
const char *s;
struct tftphdr *tp;
int n;
{
static char *opcodes[] =
{ "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" };
register char *cp, *file;
u_short op = ntohs(tp->th_opcode);
if (op < RRQ || op > ERROR)
printf("%s opcode=%x ", s, op);
else
printf("%s %s ", s, opcodes[op]);
switch (op) {
case RRQ:
case WRQ:
n -= 2;
file = cp = tp->th_stuff;
cp = strchr (cp, '\0');
printf("<file=%s, mode=%s>\n", file, cp + 1);
break;
case DATA:
printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4);
break;
case ACK:
printf("<block=%d>\n", ntohs(tp->th_block));
break;
case ERROR:
printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg);
break;
}
}
struct timeval tstart;
struct timeval tstop;
static void
startclock()
{
(void)gettimeofday(&tstart, NULL);
}
static void
stopclock()
{
(void)gettimeofday(&tstop, NULL);
}
static void
printstats(direction, amount)
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 */
printf("%s %d bytes in %.1f seconds", direction, amount, delta);
if (verbose)
printf(" [%.0f bits/sec]", (amount*8.)/delta);
putchar('\n');
}
static void
timer(sig)
int sig;
{
timeout += rexmtval;
if (timeout >= maxtimeout) {
printf("Transfer timed out.\n");
longjmp(toplevel, -1);
}
longjmp(timeoutbuf, 1);
}
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
#endif /* not lint */
/*
* Trivial file transfer protocol server.
*
* This version includes many modifications by Jim Guyton
* <guyton@rand-unix>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/param.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/tftp.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <netdb.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tftpsubs.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef HAVE_STRERROR_DECL
extern const char *strerror __P ((int));
#endif
#define TIMEOUT 5
#ifndef LOG_FTP
#define LOG_FTP LOG_DAEMON /* Use generic facility. */
#endif
int peer;
int rexmtval = TIMEOUT;
int maxtimeout = 5*TIMEOUT;
#define PKTSIZE SEGSIZE+4
char buf[PKTSIZE];
char ackbuf[PKTSIZE];
struct sockaddr_in from;
int fromlen;
void tftp __P((struct tftphdr *, int));
/*
* Null-terminated directory prefix list for absolute pathname requests and
* search list for relative pathname requests.
*
* MAXDIRS should be at least as large as the number of arguments that
* inetd allows (currently 20).
*/
#define MAXDIRS 20
static struct dirlist {
char *name;
int len;
} dirs[MAXDIRS+1];
static int suppress_naks;
static int logging;
static const char *errtomsg __P((int));
static void nak __P((int));
static const char *verifyhost __P((struct sockaddr_in *));
int
main(argc, argv)
int argc;
char *argv[];
{
register struct tftphdr *tp;
register int n;
int ch, on;
struct sockaddr_in sin;
openlog("tftpd", LOG_PID, LOG_FTP);
while ((ch = getopt(argc, argv, "ln")) != EOF) {
switch (ch) {
case 'l':
logging = 1;
break;
case 'n':
suppress_naks = 1;
break;
default:
syslog(LOG_WARNING, "ignoring unknown option -%c", ch);
}
}
if (optind < argc) {
struct dirlist *dirp;
/* Get list of directory prefixes. Skip relative pathnames. */
for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
optind++) {
if (argv[optind][0] == '/') {
dirp->name = argv[optind];
dirp->len = strlen(dirp->name);
dirp++;
}
}
}
on = 1;
if (ioctl(0, FIONBIO, &on) < 0) {
syslog(LOG_ERR, "ioctl(FIONBIO): %m\n");
exit(1);
}
fromlen = sizeof (from);
n = recvfrom(0, buf, sizeof (buf), 0,
(struct sockaddr *)&from, &fromlen);
if (n < 0) {
syslog(LOG_ERR, "recvfrom: %m\n");
exit(1);
}
/*
* Now that we have read the message out of the UDP
* socket, we fork and exit. Thus, inetd will go back
* to listening to the tftp port, and the next request
* to come in will start up a new instance of tftpd.
*
* We do this so that inetd can run tftpd in "wait" mode.
* The problem with tftpd running in "nowait" mode is that
* inetd may get one or more successful "selects" on the
* tftp port before we do our receive, so more than one
* instance of tftpd may be started up. Worse, if tftpd
* break before doing the above "recvfrom", inetd would
* spawn endless instances, clogging the system.
*/
{
int pid;
int i, j;
for (i = 1; i < 20; i++) {
pid = fork();
if (pid < 0) {
sleep(i);
/*
* flush out to most recently sent request.
*
* This may drop some request, but those
* will be resent by the clients when
* they timeout. The positive effect of
* this flush is to (try to) prevent more
* than one tftpd being started up to service
* a single request from a single client.
*/
j = sizeof from;
i = recvfrom(0, buf, sizeof (buf), 0,
(struct sockaddr *)&from, &j);
if (i > 0) {
n = i;
fromlen = j;
}
} else {
break;
}
}
if (pid < 0) {
syslog(LOG_ERR, "fork: %m\n");
exit(1);
} else if (pid != 0) {
exit(0);
}
}
from.sin_family = AF_INET;
alarm(0);
close(0);
close(1);
peer = socket(AF_INET, SOCK_DGRAM, 0);
if (peer < 0) {
syslog(LOG_ERR, "socket: %m\n");
exit(1);
}
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
if (bind(peer, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
syslog(LOG_ERR, "bind: %m\n");
exit(1);
}
if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
syslog(LOG_ERR, "connect: %m\n");
exit(1);
}
tp = (struct tftphdr *)buf;
tp->th_opcode = ntohs(tp->th_opcode);
if (tp->th_opcode == RRQ || tp->th_opcode == WRQ)
tftp(tp, n);
exit(1);
}
struct formats;
int validate_access __P((char **, int));
void sendfile __P((struct formats *));
void recvfile __P((struct formats *));
struct formats {
char *f_mode;
int (*f_validate) __P((char **, int));
void (*f_send) __P((struct formats *));
void (*f_recv) __P((struct formats *));
int f_convert;
} formats[] = {
{ "netascii", validate_access, sendfile, recvfile, 1 },
{ "octet", validate_access, sendfile, recvfile, 0 },
#ifdef notdef
{ "mail", validate_user, sendmail, recvmail, 1 },
#endif
{ 0 }
};
/*
* Handle initial connection protocol.
*/
void
tftp(tp, size)
struct tftphdr *tp;
int size;
{
register char *cp;
int first = 1, ecode;
register struct formats *pf;
char *filename, *mode;
filename = cp = tp->th_stuff;
again:
while (cp < buf + size) {
if (*cp == '\0')
break;
cp++;
}
if (*cp != '\0') {
nak(EBADOP);
exit(1);
}
if (first) {
mode = ++cp;
first = 0;
goto again;
}
for (cp = mode; *cp; cp++)
if (isupper(*cp))
*cp = tolower(*cp);
for (pf = formats; pf->f_mode; pf++)
if (strcmp(pf->f_mode, mode) == 0)
break;
if (pf->f_mode == 0) {
nak(EBADOP);
exit(1);
}
ecode = (*pf->f_validate)(&filename, tp->th_opcode);
if (logging) {
syslog(LOG_INFO, "%s: %s request for %s: %s",
verifyhost(&from),
tp->th_opcode == WRQ ? "write" : "read",
filename, errtomsg(ecode));
}
if (ecode) {
/*
* Avoid storms of naks to a RRQ broadcast for a relative
* bootfile pathname from a diskless Sun.
*/
if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
exit(0);
nak(ecode);
exit(1);
}
if (tp->th_opcode == WRQ)
(*pf->f_recv)(pf);
else
(*pf->f_send)(pf);
exit(0);
}
FILE *file;
/*
* Validate file access. Since we
* have no uid or gid, for now require
* file to exist and be publicly
* readable/writable.
* If we were invoked with arguments
* from inetd then the file must also be
* in one of the given directory prefixes.
* Note also, full path name must be
* given as we have no login directory.
*/
int
validate_access(filep, mode)
char **filep;
int mode;
{
struct stat stbuf;
int fd;
struct dirlist *dirp;
static char *pathname = 0;
char *filename = *filep;
/*
* Prevent tricksters from getting around the directory restrictions
*/
if (strstr(filename, "/../"))
return (EACCESS);
if (*filename == '/') {
/*
* Allow the request if it's in one of the approved locations.
* Special case: check the null prefix ("/") by looking
* for length = 1 and relying on the arg. processing that
* it's a /.
*/
for (dirp = dirs; dirp->name != NULL; dirp++) {
if (dirp->len == 1 ||
(!strncmp(filename, dirp->name, dirp->len) &&
filename[dirp->len] == '/'))
break;
}
/* If directory list is empty, allow access to any file */
if (dirp->name == NULL && dirp != dirs)
return (EACCESS);
if (stat(filename, &stbuf) < 0)
return (errno == ENOENT ? ENOTFOUND : EACCESS);
if ((stbuf.st_mode & S_IFMT) != S_IFREG)
return (ENOTFOUND);
if (mode == RRQ) {
if ((stbuf.st_mode & S_IROTH) == 0)
return (EACCESS);
} else {
if ((stbuf.st_mode & S_IWOTH) == 0)
return (EACCESS);
}
} else {
int err;
/*
* Relative file name: search the approved locations for it.
* Don't allow write requests or ones that avoid directory
* restrictions.
*/
if (mode != RRQ || !strncmp(filename, "../", 3))
return (EACCESS);
/*
* If the file exists in one of the directories and isn't
* readable, continue looking. However, change the error code
* to give an indication that the file exists.
*/
err = ENOTFOUND;
for (dirp = dirs; dirp->name != NULL; dirp++) {
if (pathname)
free (pathname);
pathname = malloc (strlen (dirp->name)
+ 1 + strlen (filename) + 1);
if (! pathname)
return ENOMEM;
sprintf(pathname, "%s/%s", dirp->name, filename);
if (stat(pathname, &stbuf) == 0 &&
(stbuf.st_mode & S_IFMT) == S_IFREG) {
if ((stbuf.st_mode & S_IROTH) != 0) {
break;
}
err = EACCESS;
}
}
if (dirp->name == NULL)
return (err);
*filep = filename = pathname;
}
fd = open(filename, (mode == RRQ ? O_RDONLY : (O_WRONLY | O_TRUNC))
| O_BINARY);
if (fd < 0)
return (errno + 100);
#ifdef __CYGWIN__
file = fdopen(fd, (mode == RRQ)? "rb":"wb");
#else
file = fdopen(fd, (mode == RRQ)? "r":"w");
#endif
if (file == NULL) {
return errno+100;
}
return (0);
}
int timeout;
jmp_buf timeoutbuf;
void
timer(sig)
int sig;
{
timeout += rexmtval;
if (timeout >= maxtimeout)
exit(1);
longjmp(timeoutbuf, 1);
}
/*
* Send the requested file.
*/
void
sendfile(pf)
struct formats *pf;
{
struct tftphdr *dp, *r_init();
register struct tftphdr *ap; /* ack packet */
register int size, n;
volatile int block;
signal(SIGALRM, timer);
dp = r_init();
ap = (struct tftphdr *)ackbuf;
block = 1;
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((u_short)block);
timeout = 0;
(void)setjmp(timeoutbuf);
send_data:
if (send(peer, (const char *)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((u_short)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:
(void) fclose(file);
}
void
justquit(sig)
int sig;
{
exit(0);
}
/*
* Receive a file.
*/
void
recvfile(pf)
struct formats *pf;
{
struct tftphdr *dp, *w_init();
register struct tftphdr *ap; /* ack buffer */
register int n, size;
volatile int block;
signal(SIGALRM, timer);
dp = w_init();
ap = (struct tftphdr *)ackbuf;
block = 0;
do {
timeout = 0;
ap->th_opcode = htons((u_short)ACK);
ap->th_block = htons((u_short)block);
block++;
(void) setjmp(timeoutbuf);
send_ack:
if (send(peer, ackbuf, 4, 0) != 4) {
syslog(LOG_ERR, "tftpd: write: %m\n");
goto abort;
}
write_behind(file, pf->f_convert);
for ( ; ; ) {
alarm(rexmtval);
n = recv(peer, (char *)dp, PKTSIZE, 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((u_short)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);
(void) fclose(file); /* close data file */
ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
ap->th_block = htons((u_short)(block));
(void) send(peer, ackbuf, 4, 0);
signal(SIGALRM, justquit); /* just quit on timeout */
alarm(rexmtval);
n = recv(peer, buf, sizeof (buf), 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" },
{ -1, 0 }
};
static const char *
errtomsg(error)
int error;
{
static char buf[20];
register struct errmsg *pe;
if (error == 0)
return "success";
for (pe = errmsgs; pe->e_code >= 0; pe++)
if (pe->e_code == error)
return pe->e_msg;
sprintf(buf, "error %d", error);
return buf;
}
/*
* 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(error)
int error;
{
register struct tftphdr *tp;
int length;
register struct errmsg *pe;
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 = strerror(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 (send(peer, buf, length, 0) != length)
syslog(LOG_ERR, "nak: %m\n");
}
static const char *
verifyhost(fromp)
struct sockaddr_in *fromp;
{
struct hostent *hp;
hp = gethostbyaddr((char *)&fromp->sin_addr, sizeof (fromp->sin_addr),
fromp->sin_family);
if (hp)
return hp->h_name;
else
return inet_ntoa(fromp->sin_addr);
}
