/* $NetBSD: ftp.c,v 1.178 2024/10/04 18:06:53 christos Exp $ */
/*-
* Copyright (c) 1996-2021 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1985, 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
/*
* Copyright (C) 1997 and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)ftp.c 8.6 (Berkeley) 10/27/94";
#else
__RCSID("$NetBSD: ftp.c,v 1.178 2024/10/04 18:06:53 christos Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <arpa/ftp.h>
#include <arpa/telnet.h>
#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdarg.h>
#include "ftp_var.h"
static volatile sig_atomic_t abrtflag;
static volatile sig_atomic_t timeoutflag;
static sigjmp_buf ptabort;
static int ptabflg;
static int ptflag = 0;
static char pasv[BUFSIZ]; /* passive port for proxy data connection */
size_t ftp_buflen = FTPBUFLEN;
static int empty(FILE *, FILE *, int);
__dead static void abort_squared(int);
struct sockinet {
union sockunion {
struct sockaddr_in su_sin;
#ifdef INET6
struct sockaddr_in6 su_sin6;
#endif
} si_su;
#if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
int si_len;
#endif
};
#if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
# define su_len si_len
#else
# define su_len si_su.su_sin.sin_len
#endif
#define su_family si_su.su_sin.sin_family
#define su_port si_su.su_sin.sin_port
static struct sockinet myctladdr, hisctladdr, data_addr;
char *
hookup(const char *host, const char *port)
{
int s = -1, error;
struct addrinfo hints, *res, *res0;
static char hostnamebuf[MAXHOSTNAMELEN];
socklen_t len;
int on = 1;
memset((char *)&hisctladdr, 0, sizeof (hisctladdr));
memset((char *)&myctladdr, 0, sizeof (myctladdr));
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
error = getaddrinfo(host, port, &hints, &res0);
if (error) {
warnx("Can't lookup `%s:%s': %s", host, port,
(error == EAI_SYSTEM) ? strerror(errno)
: gai_strerror(error));
code = -1;
return (0);
}
if (res0->ai_canonname)
(void)strlcpy(hostnamebuf, res0->ai_canonname,
sizeof(hostnamebuf));
else
(void)strlcpy(hostnamebuf, host, sizeof(hostnamebuf));
hostname = hostnamebuf;
for (res = res0; res; res = res->ai_next) {
char hname[NI_MAXHOST], sname[NI_MAXSERV];
ai_unmapped(res);
if (getnameinfo(res->ai_addr, res->ai_addrlen,
hname, sizeof(hname), sname, sizeof(sname),
NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
strlcpy(hname, "?", sizeof(hname));
strlcpy(sname, "?", sizeof(sname));
}
if (verbose && res0->ai_next) {
/* if we have multiple possibilities */
#ifdef INET6
if(res->ai_family == AF_INET6) {
fprintf(ttyout, "Trying [%s]:%s ...\n", hname,
sname);
} else {
#endif
fprintf(ttyout, "Trying %s:%s ...\n", hname,
sname);
#ifdef INET6
}
#endif
}
s = socket(res->ai_family, SOCK_STREAM, res->ai_protocol);
if (s < 0) {
warn("Can't create socket for connection to `%s:%s'",
hname, sname);
continue;
}
if (ftp_connect(s, res->ai_addr, res->ai_addrlen,
verbose || !res->ai_next) < 0) {
close(s);
s = -1;
continue;
}
/* finally we got one */
break;
}
if (s < 0) {
warnx("Can't connect to `%s:%s'", host, port);
code = -1;
freeaddrinfo(res0);
return 0;
}
memcpy(&hisctladdr.si_su, res->ai_addr, res->ai_addrlen);
hisctladdr.su_len = res->ai_addrlen;
freeaddrinfo(res0);
res0 = res = NULL;
len = hisctladdr.su_len;
if (getsockname(s, (struct sockaddr *)(void *)&myctladdr.si_su, &len) == -1) {
warn("Can't determine my address of connection to `%s:%s'",
host, port);
code = -1;
goto bad;
}
myctladdr.su_len = len;
#ifdef IPTOS_LOWDELAY
if (hisctladdr.su_family == AF_INET) {
int tos = IPTOS_LOWDELAY;
if (setsockopt(s, IPPROTO_IP, IP_TOS,
(void *)&tos, sizeof(tos)) == -1) {
DWARN("setsockopt %s (ignored)",
"IPTOS_LOWDELAY");
}
}
#endif
cin = fdopen(s, "r");
cout = fdopen(s, "w");
if (cin == NULL || cout == NULL) {
warnx("Can't fdopen socket");
if (cin)
(void)fclose(cin);
if (cout)
(void)fclose(cout);
code = -1;
goto bad;
}
if (verbose)
fprintf(ttyout, "Connected to %s.\n", hostname);
if (getreply(0) > 2) { /* read startup message from server */
if (cin)
(void)fclose(cin);
if (cout)
(void)fclose(cout);
code = -1;
goto bad;
}
if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)", "SO_KEEPALIVE");
}
if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)", "SO_OOBINLINE");
}
return (hostname);
bad:
(void)close(s);
return (NULL);
}
void
cmdabort(int notused __unused)
{
int oerrno = errno;
sigint_raised = 1;
alarmtimer(0);
if (fromatty)
write(fileno(ttyout), "\n", 1);
abrtflag++;
if (ptflag)
siglongjmp(ptabort, 1);
errno = oerrno;
}
void
cmdtimeout(int notused __unused)
{
int oerrno = errno;
alarmtimer(0);
if (fromatty)
write(fileno(ttyout), "\n", 1);
timeoutflag++;
if (ptflag)
siglongjmp(ptabort, 1);
errno = oerrno;
}
static int
issighandler(sigfunc func)
{
return (func != SIG_IGN &&
func != SIG_DFL &&
#ifdef SIG_HOLD
func != SIG_HOLD &&
#endif
func != SIG_ERR);
}
/*VARARGS*/
int
command(const char *fmt, ...)
{
va_list ap;
int r;
sigfunc oldsigint;
#ifndef NO_DEBUG
if (ftp_debug) {
fputs("---> ", ttyout);
va_start(ap, fmt);
if (strncmp("PASS ", fmt, 5) == 0)
fputs("PASS XXXX", ttyout);
else if (strncmp("ACCT ", fmt, 5) == 0)
fputs("ACCT XXXX", ttyout);
else
vfprintf(ttyout, fmt, ap);
va_end(ap);
putc('\n', ttyout);
}
#endif
if (cout == NULL) {
warnx("No control connection for command");
code = -1;
return (0);
}
abrtflag = 0;
oldsigint = xsignal(SIGINT, cmdabort);
va_start(ap, fmt);
vfprintf(cout, fmt, ap);
va_end(ap);
fputs("\r\n", cout);
(void)fflush(cout);
cpend = 1;
r = getreply(!strcmp(fmt, "QUIT"));
if (abrtflag && issighandler(oldsigint)) {
(*oldsigint)(SIGINT);
}
(void)xsignal(SIGINT, oldsigint);
return (r);
}
static const char *m421[] = {
"remote server timed out. Connection closed",
"user interrupt. Connection closed",
"remote server has closed connection",
};
int
getreply(int expecteof)
{
char current_line[BUFSIZ]; /* last line of previous reply */
int c, n, lineno;
int dig;
int originalcode = 0, continuation = 0;
sigfunc oldsigint, oldsigalrm;
int pflag = 0;
char *cp, *pt = pasv;
abrtflag = 0;
timeoutflag = 0;
oldsigint = xsignal(SIGINT, cmdabort);
oldsigalrm = xsignal(SIGALRM, cmdtimeout);
for (lineno = 0 ;; lineno++) {
dig = n = code = 0;
cp = current_line;
while (alarmtimer(quit_time ? quit_time : 60),
((c = getc(cin)) != '\n')) {
if (c == IAC) { /* handle telnet commands */
switch (c = getc(cin)) {
case WILL:
case WONT:
c = getc(cin);
fprintf(cout, "%c%c%c", IAC, DONT, c);
(void)fflush(cout);
break;
case DO:
case DONT:
c = getc(cin);
fprintf(cout, "%c%c%c", IAC, WONT, c);
(void)fflush(cout);
break;
default:
break;
}
continue;
}
dig++;
if (c == EOF) {
/*
* these will get trashed by pswitch()
* in lostpeer()
*/
int reply_timeoutflag = timeoutflag;
int reply_abrtflag = abrtflag;
alarmtimer(0);
if (expecteof && feof(cin)) {
(void)xsignal(SIGINT, oldsigint);
(void)xsignal(SIGALRM, oldsigalrm);
code = 221;
return (0);
}
cpend = 0;
lostpeer(0);
if (verbose) {
size_t midx;
if (reply_timeoutflag)
midx = 0;
else if (reply_abrtflag)
midx = 1;
else
midx = 2;
(void)fprintf(ttyout,
"421 Service not available, %s.\n", m421[midx]);
(void)fflush(ttyout);
}
code = 421;
(void)xsignal(SIGINT, oldsigint);
(void)xsignal(SIGALRM, oldsigalrm);
return (4);
}
if (c != '\r' && (verbose > 0 ||
((verbose > -1 && n == '5' && dig > 4) &&
(((!n && c < '5') || (n && n < '5'))
|| !retry_connect)))) {
if (proxflag &&
(dig == 1 || (dig == 5 && verbose == 0)))
fprintf(ttyout, "%s:", hostname);
(void)putc(c, ttyout);
}
if (dig < 4 && isdigit(c))
code = code * 10 + (c - '0');
if (!pflag && (code == 227 || code == 228))
pflag = 1;
else if (!pflag && code == 229)
pflag = 100;
if (dig > 4 && pflag == 1 && isdigit(c))
pflag = 2;
if (pflag == 2) {
if (c != '\r' && c != ')') {
if (pt < &pasv[sizeof(pasv) - 1])
*pt++ = c;
} else {
*pt = '\0';
pflag = 3;
}
}
if (pflag == 100 && c == '(')
pflag = 2;
if (dig == 4 && c == '-') {
if (continuation)
code = 0;
continuation++;
}
if (n == 0)
n = c;
if (cp < ¤t_line[sizeof(current_line) - 1])
*cp++ = c;
}
if (verbose > 0 || ((verbose > -1 && n == '5') &&
(n < '5' || !retry_connect))) {
(void)putc(c, ttyout);
(void)fflush(ttyout);
}
if (cp[-1] == '\r')
cp[-1] = '\0';
*cp = '\0';
if (lineno == 0)
(void)strlcpy(reply_string, current_line,
sizeof(reply_string));
if (lineno > 0 && code == 0 && reply_callback != NULL)
(*reply_callback)(current_line);
if (continuation && code != originalcode) {
if (originalcode == 0)
originalcode = code;
continue;
}
if (n != '1')
cpend = 0;
alarmtimer(0);
(void)xsignal(SIGINT, oldsigint);
(void)xsignal(SIGALRM, oldsigalrm);
if (code == 421 || originalcode == 421)
lostpeer(0);
if (abrtflag && oldsigint != cmdabort &&
issighandler(oldsigint)) {
(*oldsigint)(SIGINT);
}
if (timeoutflag && oldsigalrm != cmdtimeout &&
issighandler(oldsigalrm)) {
(*oldsigalrm)(SIGINT);
}
return (n - '0');
}
}
static int
empty(FILE *ecin, FILE *din, int sec)
{
int nr, nfd;
struct pollfd pfd[2];
nfd = 0;
if (ecin) {
pfd[nfd].fd = fileno(ecin);
pfd[nfd++].events = POLLIN;
}
if (din) {
pfd[nfd].fd = fileno(din);
pfd[nfd++].events = POLLIN;
}
if ((nr = ftp_poll(pfd, nfd, sec * 1000)) <= 0)
return nr;
nr = 0;
nfd = 0;
if (ecin)
nr |= (pfd[nfd++].revents & POLLIN) ? 1 : 0;
if (din)
nr |= (pfd[nfd++].revents & POLLIN) ? 2 : 0;
return nr;
}
static sigjmp_buf xferabort;
__dead static void
abortxfer(int notused __unused)
{
char msgbuf[100];
size_t len;
sigint_raised = 1;
alarmtimer(0);
mflag = 0;
abrtflag = 0;
switch (direction[0]) {
case 'r':
strlcpy(msgbuf, "\nreceive", sizeof(msgbuf));
break;
case 's':
strlcpy(msgbuf, "\nsend", sizeof(msgbuf));
break;
default:
errx(1, "abortxfer: unknown direction `%s'", direction);
}
len = strlcat(msgbuf, " aborted. Waiting for remote to finish abort.\n",
sizeof(msgbuf));
write(fileno(ttyout), msgbuf, len);
siglongjmp(xferabort, 1);
}
/*
* Read data from infd & write to outfd, using buf/bufsize as the temporary
* buffer, dealing with short reads or writes.
* If rate_limit != 0, rate-limit the transfer.
* If hash_interval != 0, fputc('c', ttyout) every hash_interval bytes.
* Updates global variables: bytes.
* Returns 0 if ok, 1 if there was a read error, 2 if there was a write error.
* In the case of error, errno contains the appropriate error code.
*/
static int
copy_bytes(int infd, int outfd, char *buf, size_t bufsize,
int rate_limit, int hash_interval)
{
volatile off_t hashc;
ssize_t inc, outc;
char *bufp;
struct timeval tvthen, tvnow, tvdiff;
off_t bufrem, bufchunk;
int serr;
hashc = hash_interval;
if (rate_limit)
bufchunk = rate_limit;
else
bufchunk = bufsize;
for (;;) {
if (rate_limit) {
(void)gettimeofday(&tvthen, NULL);
}
errno = 0;
inc = outc = 0;
/* copy bufchunk at a time */
bufrem = bufchunk;
while (bufrem > 0) {
inc = read(infd, buf, MIN((off_t)bufsize, bufrem));
if (inc < 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
goto copy_done;
} else if (inc == 0) {
goto copy_done;
}
bytes += inc;
bufrem -= inc;
bufp = buf;
while (inc > 0) {
outc = write(outfd, bufp, inc);
if (outc < 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
goto copy_done;
}
inc -= outc;
bufp += outc;
}
if (hash_interval) {
while (bytes >= hashc) {
(void)putc('#', ttyout);
hashc += hash_interval;
}
(void)fflush(ttyout);
}
}
if (rate_limit) { /* rate limited; wait if necessary */
for (;;) {
(void)gettimeofday(&tvnow, NULL);
timersub(&tvnow, &tvthen, &tvdiff);
if (tvdiff.tv_sec > 0)
break;
usleep(1000000 - tvdiff.tv_usec);
}
}
}
copy_done:
serr = errno;
if (hash_interval && bytes > 0) {
if (bytes < hash_interval)
(void)putc('#', ttyout);
(void)putc('\n', ttyout);
(void)fflush(ttyout);
}
errno = serr;
if (inc == -1)
return 1;
if (outc == -1)
return 2;
return 0;
}
void
sendrequest(const char *cmd, const char *local, const char *remote,
int printnames)
{
struct stat st;
int c;
FILE *volatile fin;
FILE *volatile dout;
int (*volatile closefunc)(FILE *);
sigfunc volatile oldintr;
sigfunc volatile oldpipe;
off_t volatile hashbytes;
int hash_interval;
const char *lmode;
static size_t bufsize;
static char *buf;
int oprogress;
hashbytes = mark;
direction = "sent";
dout = NULL;
bytes = 0;
filesize = -1;
oprogress = progress;
if (verbose && printnames) {
if (*local != '-')
fprintf(ttyout, "local: %s ", local);
if (remote)
fprintf(ttyout, "remote: %s\n", remote);
}
if (proxy) {
proxtrans(cmd, local, remote);
return;
}
if (curtype != type)
changetype(type, 0);
closefunc = NULL;
oldintr = SIG_ERR;
oldpipe = SIG_ERR;
lmode = "w";
if (sigsetjmp(xferabort, 1)) {
while (cpend)
(void)getreply(0);
code = -1;
goto cleanupsend;
}
(void)xsignal(SIGQUIT, psummary);
oldintr = xsignal(SIGINT, abortxfer);
if (strcmp(local, "-") == 0) {
fin = stdin;
progress = 0;
} else if (*local == '|') {
oldpipe = xsignal(SIGPIPE, SIG_IGN);
fin = popen(local + 1, "r");
if (fin == NULL) {
warn("Can't execute `%s'", local + 1);
code = -1;
goto cleanupsend;
}
progress = 0;
closefunc = pclose;
} else {
fin = fopen(local, "r");
if (fin == NULL) {
warn("Can't open `%s'", local);
code = -1;
goto cleanupsend;
}
closefunc = fclose;
if (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) {
fprintf(ttyout, "%s: not a plain file.\n", local);
code = -1;
goto cleanupsend;
}
filesize = st.st_size;
}
if (initconn()) {
code = -1;
goto cleanupsend;
}
if (sigsetjmp(xferabort, 1))
goto abort;
if (restart_point &&
(strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) {
off_t rc;
rc = -1;
switch (curtype) {
case TYPE_A:
rc = fseeko(fin, restart_point, SEEK_SET);
break;
case TYPE_I:
case TYPE_L:
rc = lseek(fileno(fin), restart_point, SEEK_SET);
break;
}
if (rc < 0) {
warn("Can't seek to restart `%s'", local);
goto cleanupsend;
}
if (command("REST " LLF, (LLT)restart_point) != CONTINUE)
goto cleanupsend;
lmode = "r+";
}
if (remote) {
if (command("%s %s", cmd, remote) != PRELIM)
goto cleanupsend;
} else {
if (command("%s", cmd) != PRELIM)
goto cleanupsend;
}
dirchange = 1;
dout = dataconn(lmode);
if (dout == NULL)
goto abort;
assert(sndbuf_size > 0);
if ((size_t)sndbuf_size > bufsize) {
if (buf)
(void)free(buf);
bufsize = sndbuf_size;
buf = ftp_malloc(bufsize);
}
progressmeter(-1);
if (oldpipe == SIG_ERR) {
oldpipe = xsignal(SIGPIPE, SIG_IGN);
}
hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0;
switch (curtype) {
case TYPE_I:
case TYPE_L:
c = copy_bytes(fileno(fin), fileno(dout), buf, bufsize,
rate_put, hash_interval);
if (c == 1) {
warn("Reading `%s'", local);
} else if (c == 2) {
if (errno != EPIPE)
warn("Writing to network");
bytes = -1;
}
break;
case TYPE_A:
while ((c = getc(fin)) != EOF) {
if (c == '\n') {
while (hash_interval && bytes >= hashbytes) {
(void)putc('#', ttyout);
(void)fflush(ttyout);
hashbytes += mark;
}
if (ferror(dout))
break;
(void)putc('\r', dout);
bytes++;
}
(void)putc(c, dout);
bytes++;
#if 0 /* this violates RFC 959 */
if (c == '\r') {
(void)putc('\0', dout);
bytes++;
}
#endif
}
if (hash_interval) {
if (bytes < hashbytes)
(void)putc('#', ttyout);
(void)putc('\n', ttyout);
}
if (ferror(fin))
warn("Reading `%s'", local);
if (ferror(dout)) {
if (errno != EPIPE)
warn("Writing to network");
bytes = -1;
}
break;
}
progressmeter(1);
if (closefunc != NULL) {
(*closefunc)(fin);
fin = NULL;
}
(void)fclose(dout);
dout = NULL;
(void)getreply(0);
if (bytes > 0)
ptransfer(0);
goto cleanupsend;
abort:
(void)xsignal(SIGINT, oldintr);
oldintr = SIG_ERR;
if (!cpend) {
code = -1;
goto cleanupsend;
}
if (data >= 0) {
(void)close(data);
data = -1;
}
if (dout) {
(void)fclose(dout);
dout = NULL;
}
(void)getreply(0);
code = -1;
if (bytes > 0)
ptransfer(0);
cleanupsend:
if (oldintr != SIG_ERR)
(void)xsignal(SIGINT, oldintr);
if (oldpipe != SIG_ERR)
(void)xsignal(SIGPIPE, oldpipe);
if (data >= 0) {
(void)close(data);
data = -1;
}
if (closefunc != NULL && fin != NULL)
(*closefunc)(fin);
if (dout)
(void)fclose(dout);
progress = oprogress;
restart_point = 0;
bytes = 0;
}
void
recvrequest(const char *cmd, char *volatile local, const char *remote,
const char *lmode, int printnames, int ignorespecial)
{
FILE *volatile fout;
FILE *volatile din;
int (*volatile closefunc)(FILE *);
sigfunc volatile oldintr;
sigfunc volatile oldpipe;
int c, d;
int volatile is_retr;
int volatile tcrflag;
int volatile bare_lfs;
static size_t bufsize;
static char *buf;
off_t volatile hashbytes;
int hash_interval;
struct stat st;
time_t mtime;
struct timeval tval[2];
int oprogress;
int opreserve;
fout = NULL;
din = NULL;
hashbytes = mark;
direction = "received";
bytes = 0;
bare_lfs = 0;
filesize = -1;
oprogress = progress;
opreserve = preserve;
is_retr = (strcmp(cmd, "RETR") == 0);
if (is_retr && verbose && printnames) {
if (ignorespecial || *local != '-')
fprintf(ttyout, "local: %s ", local);
if (remote)
fprintf(ttyout, "remote: %s\n", remote);
}
if (proxy && is_retr) {
proxtrans(cmd, local, remote);
return;
}
closefunc = NULL;
oldintr = SIG_ERR;
oldpipe = SIG_ERR;
tcrflag = !crflag && is_retr;
if (sigsetjmp(xferabort, 1)) {
while (cpend)
(void)getreply(0);
code = -1;
goto cleanuprecv;
}
(void)xsignal(SIGQUIT, psummary);
oldintr = xsignal(SIGINT, abortxfer);
if (ignorespecial || (strcmp(local, "-") && *local != '|')) {
if (access(local, W_OK) < 0) {
char *dir = strrchr(local, '/');
if (errno != ENOENT && errno != EACCES) {
warn("Can't access `%s'", local);
code = -1;
goto cleanuprecv;
}
if (dir != NULL)
*dir = 0;
d = access(dir == local ? "/" :
dir ? local : ".", W_OK);
if (dir != NULL)
*dir = '/';
if (d < 0) {
warn("Can't access `%s'", local);
code = -1;
goto cleanuprecv;
}
if (!runique && errno == EACCES &&
chmod(local, (S_IRUSR|S_IWUSR)) < 0) {
warn("Can't chmod `%s'", local);
code = -1;
goto cleanuprecv;
}
if (runique && errno == EACCES &&
(local = gunique(local)) == NULL) {
code = -1;
goto cleanuprecv;
}
}
else if (runique && (local = gunique(local)) == NULL) {
code = -1;
goto cleanuprecv;
}
}
if (!is_retr) {
if (curtype != TYPE_A)
changetype(TYPE_A, 0);
} else {
if (curtype != type)
changetype(type, 0);
filesize = remotesize(remote, 0);
if (code == 421 || code == -1)
goto cleanuprecv;
}
if (initconn()) {
code = -1;
goto cleanuprecv;
}
if (sigsetjmp(xferabort, 1))
goto abort;
if (is_retr && restart_point &&
command("REST " LLF, (LLT) restart_point) != CONTINUE)
goto cleanuprecv;
if (! EMPTYSTRING(remote)) {
if (command("%s %s", cmd, remote) != PRELIM)
goto cleanuprecv;
} else {
if (command("%s", cmd) != PRELIM)
goto cleanuprecv;
}
din = dataconn("r");
if (din == NULL)
goto abort;
if (!ignorespecial && strcmp(local, "-") == 0) {
fout = stdout;
progress = 0;
preserve = 0;
} else if (!ignorespecial && *local == '|') {
oldpipe = xsignal(SIGPIPE, SIG_IGN);
fout = popen(local + 1, "w");
if (fout == NULL) {
warn("Can't execute `%s'", local+1);
goto abort;
}
progress = 0;
preserve = 0;
closefunc = pclose;
} else {
fout = fopen(local, lmode);
if (fout == NULL) {
warn("Can't open `%s'", local);
goto abort;
}
closefunc = fclose;
}
if (fstat(fileno(fout), &st) != -1 && !S_ISREG(st.st_mode)) {
progress = 0;
preserve = 0;
}
assert(rcvbuf_size > 0);
if ((size_t)rcvbuf_size > bufsize) {
if (buf)
(void)free(buf);
bufsize = rcvbuf_size;
buf = ftp_malloc(bufsize);
}
progressmeter(-1);
hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0;
switch (curtype) {
case TYPE_I:
case TYPE_L:
if (is_retr && restart_point &&
lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
warn("Can't seek to restart `%s'", local);
goto cleanuprecv;
}
c = copy_bytes(fileno(din), fileno(fout), buf, bufsize,
rate_get, hash_interval);
if (c == 1) {
if (errno != EPIPE)
warn("Reading from network");
bytes = -1;
} else if (c == 2) {
warn("Writing `%s'", local);
}
break;
case TYPE_A:
if (is_retr && restart_point) {
int ch;
off_t i;
if (fseeko(fout, (off_t)0, SEEK_SET) < 0)
goto done;
for (i = 0; i++ < restart_point;) {
if ((ch = getc(fout)) == EOF)
goto done;
if (ch == '\n')
i++;
}
if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) {
done:
warn("Can't seek to restart `%s'", local);
goto cleanuprecv;
}
}
while ((c = getc(din)) != EOF) {
if (c == '\n')
bare_lfs++;
while (c == '\r') {
while (hash_interval && bytes >= hashbytes) {
(void)putc('#', ttyout);
(void)fflush(ttyout);
hashbytes += mark;
}
bytes++;
if ((c = getc(din)) != '\n' || tcrflag) {
if (ferror(fout))
goto break2;
(void)putc('\r', fout);
if (c == '\0') {
bytes++;
goto contin2;
}
if (c == EOF)
goto contin2;
}
}
(void)putc(c, fout);
bytes++;
contin2: ;
}
break2:
if (hash_interval) {
if (bytes < hashbytes)
(void)putc('#', ttyout);
(void)putc('\n', ttyout);
}
if (ferror(din)) {
if (errno != EPIPE)
warn("Reading from network");
bytes = -1;
}
if (ferror(fout))
warn("Writing `%s'", local);
break;
}
progressmeter(1);
if (closefunc != NULL) {
(*closefunc)(fout);
fout = NULL;
}
(void)fclose(din);
din = NULL;
(void)getreply(0);
if (bare_lfs) {
fprintf(ttyout,
"WARNING! %d bare linefeeds received in ASCII mode.\n",
bare_lfs);
fputs("File may not have transferred correctly.\n", ttyout);
}
if (bytes >= 0 && is_retr) {
if (bytes > 0)
ptransfer(0);
if (preserve && (closefunc == fclose)) {
mtime = remotemodtime(remote, 0);
if (mtime != -1) {
(void)gettimeofday(&tval[0], NULL);
tval[1].tv_sec = mtime;
tval[1].tv_usec = 0;
if (utimes(local, tval) == -1) {
fprintf(ttyout,
"Can't change modification time on %s to %s",
local,
rfc2822time(localtime(&mtime)));
}
}
}
}
goto cleanuprecv;
abort:
/*
* abort using RFC 959 recommended IP,SYNC sequence
*/
if (! sigsetjmp(xferabort, 1)) {
/* this is the first call */
(void)xsignal(SIGINT, abort_squared);
if (!cpend) {
code = -1;
goto cleanuprecv;
}
abort_remote(din);
}
code = -1;
if (bytes > 0)
ptransfer(0);
cleanuprecv:
if (oldintr != SIG_ERR)
(void)xsignal(SIGINT, oldintr);
if (oldpipe != SIG_ERR)
(void)xsignal(SIGPIPE, oldpipe);
if (data >= 0) {
(void)close(data);
data = -1;
}
if (closefunc != NULL && fout != NULL)
(*closefunc)(fout);
if (din)
(void)fclose(din);
progress = oprogress;
preserve = opreserve;
bytes = 0;
}
/*
* Need to start a listen on the data channel before we send the command,
* otherwise the server's connect may fail.
*/
int
initconn(void)
{
char *p, *a;
int result, tmpno = 0;
int on = 1;
int error;
unsigned int addr[16], port[2];
unsigned int af, hal, pal;
socklen_t len;
const char *pasvcmd = NULL;
int overbose;
#ifdef INET6
#ifndef NO_DEBUG
if (myctladdr.su_family == AF_INET6 && ftp_debug &&
(IN6_IS_ADDR_LINKLOCAL(&myctladdr.si_su.su_sin6.sin6_addr) ||
IN6_IS_ADDR_SITELOCAL(&myctladdr.si_su.su_sin6.sin6_addr))) {
warnx("Use of scoped addresses can be troublesome");
}
#endif
#endif
reinit:
if (passivemode) {
data_addr = myctladdr;
data = socket(data_addr.su_family, SOCK_STREAM, 0);
if (data < 0) {
warn("Can't create socket for data connection");
return (1);
}
if ((options & SO_DEBUG) &&
setsockopt(data, SOL_SOCKET, SO_DEBUG,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)", "SO_DEBUG");
}
result = COMPLETE + 1;
switch (data_addr.su_family) {
case AF_INET:
if (epsv4 && !epsv4bad) {
pasvcmd = "EPSV";
overbose = verbose;
if (ftp_debug == 0)
verbose = -1;
result = command("EPSV");
verbose = overbose;
if (verbose > 0 &&
(result == COMPLETE || !connected))
fprintf(ttyout, "%s\n", reply_string);
if (!connected)
return (1);
/*
* this code is to be friendly with broken
* BSDI ftpd
*/
if (code / 10 == 22 && code != 229) {
fputs(
"wrong server: return code must be 229\n",
ttyout);
result = COMPLETE + 1;
}
if (result != COMPLETE) {
epsv4bad = 1;
DPRINTF("disabling epsv4 for this "
"connection\n");
}
}
if (result != COMPLETE) {
pasvcmd = "PASV";
result = command("PASV");
if (!connected)
return (1);
}
break;
#ifdef INET6
case AF_INET6:
if (epsv6 && !epsv6bad) {
pasvcmd = "EPSV";
overbose = verbose;
if (ftp_debug == 0)
verbose = -1;
result = command("EPSV");
verbose = overbose;
if (verbose > 0 &&
(result == COMPLETE || !connected))
fprintf(ttyout, "%s\n", reply_string);
if (!connected)
return (1);
/*
* this code is to be friendly with
* broken BSDI ftpd
*/
if (code / 10 == 22 && code != 229) {
fputs(
"wrong server: return code must be 229\n",
ttyout);
result = COMPLETE + 1;
}
if (result != COMPLETE) {
epsv6bad = 1;
DPRINTF("disabling epsv6 for this "
"connection\n");
}
}
if (result != COMPLETE) {
pasvcmd = "LPSV";
result = command("LPSV");
}
if (!connected)
return (1);
break;
#endif
default:
result = COMPLETE + 1;
break;
}
if (result != COMPLETE) {
if (activefallback) {
(void)close(data);
data = -1;
passivemode = 0;
#if 0
activefallback = 0;
#endif
goto reinit;
}
fputs("Passive mode refused.\n", ttyout);
goto bad;
}
#define pack2(var, off) \
(((var[(off) + 0] & 0xff) << 8) | ((var[(off) + 1] & 0xff) << 0))
#define pack4(var, off) \
(((var[(off) + 0] & 0xff) << 24) | ((var[(off) + 1] & 0xff) << 16) | \
((var[(off) + 2] & 0xff) << 8) | ((var[(off) + 3] & 0xff) << 0))
#define UC(b) (((int)b)&0xff)
/*
* What we've got at this point is a string of comma separated
* one-byte unsigned integer values, separated by commas.
*/
if (strcmp(pasvcmd, "PASV") == 0) {
if (data_addr.su_family != AF_INET) {
fputs(
"Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
goto bad;
}
if (code / 10 == 22 && code != 227) {
fputs("wrong server: return code must be 227\n",
ttyout);
goto bad;
}
error = sscanf(pasv, "%u,%u,%u,%u,%u,%u",
&addr[0], &addr[1], &addr[2], &addr[3],
&port[0], &port[1]);
if (error != 6) {
fputs(
"Passive mode address scan failure. Shouldn't happen!\n", ttyout);
goto bad;
}
memset(&data_addr, 0, sizeof(data_addr));
data_addr.su_family = AF_INET;
data_addr.su_len = sizeof(struct sockaddr_in);
data_addr.si_su.su_sin.sin_addr.s_addr =
htonl(pack4(addr, 0));
data_addr.su_port = htons(pack2(port, 0));
if (data_addr.si_su.su_sin.sin_addr.s_addr !=
hisctladdr.si_su.su_sin.sin_addr.s_addr) {
fputs("Passive mode address mismatch.\n",
ttyout);
goto bad;
}
} else if (strcmp(pasvcmd, "LPSV") == 0) {
if (code / 10 == 22 && code != 228) {
fputs("wrong server: return code must be 228\n",
ttyout);
goto bad;
}
switch (data_addr.su_family) {
case AF_INET:
error = sscanf(pasv,
"%u,%u,%u,%u,%u,%u,%u,%u,%u",
&af, &hal,
&addr[0], &addr[1], &addr[2], &addr[3],
&pal, &port[0], &port[1]);
if (error != 9) {
fputs(
"Passive mode address scan failure. Shouldn't happen!\n", ttyout);
goto bad;
}
if (af != 4 || hal != 4 || pal != 2) {
fputs(
"Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
goto bad;
}
memset(&data_addr, 0, sizeof(data_addr));
data_addr.su_family = AF_INET;
data_addr.su_len = sizeof(struct sockaddr_in);
data_addr.si_su.su_sin.sin_addr.s_addr =
htonl(pack4(addr, 0));
data_addr.su_port = htons(pack2(port, 0));
if (data_addr.si_su.su_sin.sin_addr.s_addr !=
hisctladdr.si_su.su_sin.sin_addr.s_addr) {
fputs("Passive mode address mismatch.\n",
ttyout);
goto bad;
}
break;
#ifdef INET6
case AF_INET6:
error = sscanf(pasv,
"%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u",
&af, &hal,
&addr[0], &addr[1], &addr[2], &addr[3],
&addr[4], &addr[5], &addr[6], &addr[7],
&addr[8], &addr[9], &addr[10],
&addr[11], &addr[12], &addr[13],
&addr[14], &addr[15],
&pal, &port[0], &port[1]);
if (error != 21) {
fputs(
"Passive mode address scan failure. Shouldn't happen!\n", ttyout);
goto bad;
}
if (af != 6 || hal != 16 || pal != 2) {
fputs(
"Passive mode AF mismatch. Shouldn't happen!\n", ttyout);
goto bad;
}
memset(&data_addr, 0, sizeof(data_addr));
data_addr.su_family = AF_INET6;
data_addr.su_len = sizeof(struct sockaddr_in6);
{
size_t i;
for (i = 0; i < sizeof(struct in6_addr); i++) {
data_addr.si_su.su_sin6.sin6_addr.s6_addr[i] =
UC(addr[i]);
}
}
data_addr.su_port = htons(pack2(port, 0));
if (memcmp(
&data_addr.si_su.su_sin6.sin6_addr,
&hisctladdr.si_su.su_sin6.sin6_addr,
sizeof(data_addr.si_su.su_sin6.sin6_addr))) {
fputs("Passive mode address mismatch.\n",
ttyout);
goto bad;
}
break;
#endif
default:
fputs("Unknown passive mode AF.\n", ttyout);
goto bad;
}
} else if (strcmp(pasvcmd, "EPSV") == 0) {
char delim[4];
port[0] = 0;
if (code / 10 == 22 && code != 229) {
fputs("wrong server: return code must be 229\n",
ttyout);
goto bad;
}
if (sscanf(pasv, "%c%c%c%d%c", &delim[0],
&delim[1], &delim[2], &port[1],
&delim[3]) != 5) {
fputs("parse error!\n", ttyout);
goto bad;
}
if (delim[0] != delim[1] || delim[0] != delim[2]
|| delim[0] != delim[3]) {
fputs("parse error!\n", ttyout);
goto bad;
}
data_addr = hisctladdr;
data_addr.su_port = htons(port[1]);
} else
goto bad;
if (ftp_connect(data, (struct sockaddr *)(void *)&data_addr.si_su,
data_addr.su_len, 1) < 0) {
if (activefallback) {
(void)close(data);
data = -1;
passivemode = 0;
#if 0
activefallback = 0;
#endif
goto reinit;
}
goto bad;
}
#ifdef IPTOS_THROUGHPUT
if (data_addr.su_family == AF_INET) {
on = IPTOS_THROUGHPUT;
if (setsockopt(data, IPPROTO_IP, IP_TOS,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)",
"IPTOS_THROUGHPUT");
}
}
#endif
return (0);
}
noport:
data_addr = myctladdr;
if (sendport)
data_addr.su_port = 0; /* let system pick one */
if (data != -1)
(void)close(data);
data = socket(data_addr.su_family, SOCK_STREAM, 0);
if (data < 0) {
warn("Can't create socket for data connection");
if (tmpno)
sendport = 1;
return (1);
}
if (!sendport)
if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR,
(void *)&on, sizeof(on)) == -1) {
warn("Can't set SO_REUSEADDR on data connection");
goto bad;
}
if (bind(data, (struct sockaddr *)(void *)&data_addr.si_su,
data_addr.su_len) < 0) {
warn("Can't bind for data connection");
goto bad;
}
if ((options & SO_DEBUG) &&
setsockopt(data, SOL_SOCKET, SO_DEBUG,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)", "SO_DEBUG");
}
len = sizeof(data_addr.si_su);
memset((char *)&data_addr, 0, sizeof (data_addr));
if (getsockname(data, (struct sockaddr *)(void *)&data_addr.si_su, &len) == -1) {
warn("Can't determine my address of data connection");
goto bad;
}
data_addr.su_len = len;
if (ftp_listen(data, 1) < 0)
warn("Can't listen to data connection");
if (sendport) {
char hname[NI_MAXHOST], sname[NI_MAXSERV];
struct sockinet tmp;
switch (data_addr.su_family) {
case AF_INET:
if (!epsv4 || epsv4bad) {
result = COMPLETE + 1;
break;
}
#ifdef INET6
/* FALLTHROUGH */
case AF_INET6:
if (!epsv6 || epsv6bad) {
result = COMPLETE + 1;
break;
}
#endif
af = (data_addr.su_family == AF_INET) ? 1 : 2;
tmp = data_addr;
#ifdef INET6
if (tmp.su_family == AF_INET6)
tmp.si_su.su_sin6.sin6_scope_id = 0;
#endif
if (getnameinfo((struct sockaddr *)(void *)&tmp.si_su,
tmp.su_len, hname, sizeof(hname), sname,
sizeof(sname), NI_NUMERICHOST | NI_NUMERICSERV)) {
result = ERROR;
} else {
overbose = verbose;
if (ftp_debug == 0)
verbose = -1;
result = command("EPRT |%u|%s|%s|", af, hname,
sname);
verbose = overbose;
if (verbose > 0 &&
(result == COMPLETE || !connected))
fprintf(ttyout, "%s\n", reply_string);
if (!connected)
return (1);
if (result != COMPLETE) {
epsv4bad = 1;
DPRINTF("disabling epsv4 for this "
"connection\n");
}
}
break;
default:
result = COMPLETE + 1;
break;
}
if (result == COMPLETE)
goto skip_port;
switch (data_addr.su_family) {
case AF_INET:
a = (char *)&data_addr.si_su.su_sin.sin_addr;
p = (char *)&data_addr.su_port;
result = command("PORT %d,%d,%d,%d,%d,%d",
UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
UC(p[0]), UC(p[1]));
break;
#ifdef INET6
case AF_INET6: {
uint8_t ua[sizeof(data_addr.si_su.su_sin6.sin6_addr)];
uint8_t up[sizeof(data_addr.su_port)];
memcpy(ua, &data_addr.si_su.su_sin6.sin6_addr,
sizeof(ua));
memcpy(up, &data_addr.su_port, sizeof(up));
result = command(
"LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
6, 16,
ua[0], ua[1], ua[2], ua[3],
ua[4], ua[5], ua[6], ua[7],
ua[8], ua[9], ua[10], ua[11],
ua[12], ua[13], ua[14], ua[15],
2,
up[0], up[1]);
break;
}
#endif
default:
result = COMPLETE + 1; /* xxx */
}
if (!connected)
return (1);
skip_port:
if (result == ERROR && sendport == -1) {
sendport = 0;
tmpno = 1;
goto noport;
}
return (result != COMPLETE);
}
if (tmpno)
sendport = 1;
#ifdef IPTOS_THROUGHPUT
if (data_addr.su_family == AF_INET) {
on = IPTOS_THROUGHPUT;
if (setsockopt(data, IPPROTO_IP, IP_TOS,
(void *)&on, sizeof(on)) == -1) {
DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT");
}
}
#endif
return (0);
bad:
(void)close(data);
data = -1;
if (tmpno)
sendport = 1;
return (1);
}
FILE *
dataconn(const char *lmode)
{
struct sockinet from;
int s, flags, rv, timeout;
struct timeval endtime, now, td;
struct pollfd pfd[1];
socklen_t fromlen;
if (passivemode) /* passive data connection */
return (fdopen(data, lmode));
/* active mode data connection */
if ((flags = fcntl(data, F_GETFL, 0)) == -1)
goto dataconn_failed; /* get current socket flags */
if (fcntl(data, F_SETFL, flags | O_NONBLOCK) == -1)
goto dataconn_failed; /* set non-blocking connect */
/* NOTE: we now must restore socket flags on successful exit */
/* limit time waiting on listening socket */
pfd[0].fd = data;
pfd[0].events = POLLIN;
(void)gettimeofday(&endtime, NULL); /* determine end time */
endtime.tv_sec += (quit_time > 0) ? quit_time: 60;
/* without -q, default to 60s */
do {
(void)gettimeofday(&now, NULL);
timersub(&endtime, &now, &td);
timeout = (int)(td.tv_sec * 1000 + td.tv_usec / 1000);
if (timeout < 0)
timeout = 0;
rv = ftp_poll(pfd, 1, timeout);
/* loop until poll !EINTR && !EAGAIN */
} while (rv == -1 && (errno == EINTR || errno == EAGAIN));
if (rv == -1) {
warn("Can't poll waiting before accept");
goto dataconn_failed;
}
if (rv == 0) {
warnx("Poll timeout waiting before accept");
goto dataconn_failed;
}
/* (non-blocking) accept the connection */
fromlen = myctladdr.su_len;
do {
s = accept(data, (struct sockaddr *)(void *)&from.si_su, &fromlen);
/* loop until accept !EINTR && !EAGAIN */
} while (s == -1 && (errno == EINTR || errno == EAGAIN));
if (s == -1) {
warn("Can't accept data connection");
goto dataconn_failed;
}
(void)close(data);
data = s;
if (fcntl(data, F_SETFL, flags) == -1) /* restore socket flags */
goto dataconn_failed;
#ifdef IPTOS_THROUGHPUT
if (from.su_family == AF_INET) {
int tos = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS,
(void *)&tos, sizeof(tos)) == -1) {
DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT");
}
}
#endif
return (fdopen(data, lmode));
dataconn_failed:
(void)close(data);
data = -1;
return (NULL);
}
void
psabort(int notused __unused)
{
int oerrno = errno;
sigint_raised = 1;
alarmtimer(0);
abrtflag++;
errno = oerrno;
}
void
pswitch(int flag)
{
sigfunc oldintr;
static struct comvars {
int connect;
char name[MAXHOSTNAMELEN];
struct sockinet mctl;
struct sockinet hctl;
FILE *in;
FILE *out;
int tpe;
int curtpe;
int cpnd;
int sunqe;
int runqe;
int mcse;
int ntflg;
char nti[17];
char nto[17];
int mapflg;
char mi[MAXPATHLEN];
char mo[MAXPATHLEN];
} proxstruct, tmpstruct;
struct comvars *ip, *op;
abrtflag = 0;
oldintr = xsignal(SIGINT, psabort);
if (flag) {
if (proxy)
return;
ip = &tmpstruct;
op = &proxstruct;
proxy++;
} else {
if (!proxy)
return;
ip = &proxstruct;
op = &tmpstruct;
proxy = 0;
}
ip->connect = connected;
connected = op->connect;
if (hostname)
(void)strlcpy(ip->name, hostname, sizeof(ip->name));
else
ip->name[0] = '\0';
hostname = op->name;
ip->hctl = hisctladdr;
hisctladdr = op->hctl;
ip->mctl = myctladdr;
myctladdr = op->mctl;
ip->in = cin;
cin = op->in;
ip->out = cout;
cout = op->out;
ip->tpe = type;
type = op->tpe;
ip->curtpe = curtype;
curtype = op->curtpe;
ip->cpnd = cpend;
cpend = op->cpnd;
ip->sunqe = sunique;
sunique = op->sunqe;
ip->runqe = runique;
runique = op->runqe;
ip->mcse = mcase;
mcase = op->mcse;
ip->ntflg = ntflag;
ntflag = op->ntflg;
(void)strlcpy(ip->nti, ntin, sizeof(ip->nti));
(void)strlcpy(ntin, op->nti, sizeof(ntin));
(void)strlcpy(ip->nto, ntout, sizeof(ip->nto));
(void)strlcpy(ntout, op->nto, sizeof(ntout));
ip->mapflg = mapflag;
mapflag = op->mapflg;
(void)strlcpy(ip->mi, mapin, sizeof(ip->mi));
(void)strlcpy(mapin, op->mi, sizeof(mapin));
(void)strlcpy(ip->mo, mapout, sizeof(ip->mo));
(void)strlcpy(mapout, op->mo, sizeof(mapout));
(void)xsignal(SIGINT, oldintr);
if (abrtflag) {
abrtflag = 0;
(*oldintr)(SIGINT);
}
}
__dead static void
abortpt(int notused __unused)
{
sigint_raised = 1;
alarmtimer(0);
if (fromatty)
write(fileno(ttyout), "\n", 1);
ptabflg++;
mflag = 0;
abrtflag = 0;
siglongjmp(ptabort, 1);
}
void
proxtrans(const char *cmd, const char *local, const char *remote)
{
sigfunc volatile oldintr;
int prox_type, nfnd;
int volatile secndflag;
const char *volatile cmd2;
oldintr = SIG_ERR;
secndflag = 0;
if (strcmp(cmd, "RETR"))
cmd2 = "RETR";
else
cmd2 = runique ? "STOU" : "STOR";
if ((prox_type = type) == 0) {
if (unix_server && unix_proxy)
prox_type = TYPE_I;
else
prox_type = TYPE_A;
}
if (curtype != prox_type)
changetype(prox_type, 1);
if (command("PASV") != COMPLETE) {
fputs("proxy server does not support third party transfers.\n",
ttyout);
return;
}
pswitch(0);
if (!connected) {
fputs("No primary connection.\n", ttyout);
pswitch(1);
code = -1;
return;
}
if (curtype != prox_type)
changetype(prox_type, 1);
if (command("PORT %s", pasv) != COMPLETE) {
pswitch(1);
return;
}
if (sigsetjmp(ptabort, 1))
goto abort;
oldintr = xsignal(SIGINT, abortpt);
if ((restart_point &&
(command("REST " LLF, (LLT) restart_point) != CONTINUE))
|| (command("%s %s", cmd, remote) != PRELIM)) {
(void)xsignal(SIGINT, oldintr);
pswitch(1);
return;
}
sleep(2);
pswitch(1);
secndflag++;
if ((restart_point &&
(command("REST " LLF, (LLT) restart_point) != CONTINUE))
|| (command("%s %s", cmd2, local) != PRELIM))
goto abort;
ptflag++;
(void)getreply(0);
pswitch(0);
(void)getreply(0);
(void)xsignal(SIGINT, oldintr);
pswitch(1);
ptflag = 0;
fprintf(ttyout, "local: %s remote: %s\n", local, remote);
return;
abort:
if (sigsetjmp(xferabort, 1)) {
(void)xsignal(SIGINT, oldintr);
return;
}
(void)xsignal(SIGINT, abort_squared);
ptflag = 0;
if (strcmp(cmd, "RETR") && !proxy)
pswitch(1);
else if (!strcmp(cmd, "RETR") && proxy)
pswitch(0);
if (!cpend && !secndflag) { /* only here if cmd = "STOR" (proxy=1) */
if (command("%s %s", cmd2, local) != PRELIM) {
pswitch(0);
if (cpend)
abort_remote(NULL);
}
pswitch(1);
if (ptabflg)
code = -1;
(void)xsignal(SIGINT, oldintr);
return;
}
if (cpend)
abort_remote(NULL);
pswitch(!proxy);
if (!cpend && !secndflag) { /* only if cmd = "RETR" (proxy=1) */
if (command("%s %s", cmd2, local) != PRELIM) {
pswitch(0);
if (cpend)
abort_remote(NULL);
pswitch(1);
if (ptabflg)
code = -1;
(void)xsignal(SIGINT, oldintr);
return;
}
}
if (cpend)
abort_remote(NULL);
pswitch(!proxy);
if (cpend) {
if ((nfnd = empty(cin, NULL, 10)) <= 0) {
if (nfnd < 0)
warn("Error aborting proxy command");
if (ptabflg)
code = -1;
lostpeer(0);
}
(void)getreply(0);
(void)getreply(0);
}
if (proxy)
pswitch(0);
pswitch(1);
if (ptabflg)
code = -1;
(void)xsignal(SIGINT, oldintr);
}
void
reset(int argc, char *argv[])
{
int nfnd = 1;
if (argc == 0 && argv != NULL) {
UPRINTF("usage: %s\n", argv[0]);
code = -1;
return;
}
while (nfnd > 0) {
if ((nfnd = empty(cin, NULL, 0)) < 0) {
warn("Error resetting connection");
code = -1;
lostpeer(0);
} else if (nfnd)
(void)getreply(0);
}
}
char *
gunique(char *local)
{
static char new[MAXPATHLEN];
char *cp = strrchr(local, '/');
int d, count = 0;
size_t len;
char ext = '1';
if (cp)
*cp = '\0';
d = access(cp == local ? "/" : cp ? local : ".", W_OK);
if (cp)
*cp = '/';
if (d < 0) {
warn("Can't access `%s'", local);
return (NULL);
}
len = strlcpy(new, local, sizeof(new));
cp = &new[len];
*cp++ = '.';
while (!d) {
if (++count == 100) {
fputs("runique: can't find unique file name.\n",
ttyout);
return (NULL);
}
*cp++ = ext;
*cp = '\0';
if (ext == '9')
ext = '0';
else
ext++;
if ((d = access(new, F_OK)) < 0)
break;
if (ext != '0')
cp--;
else if (*(cp - 2) == '.')
*(cp - 1) = '1';
else {
*(cp - 2) = *(cp - 2) + 1;
cp--;
}
}
return (new);
}
/*
* abort_squared --
* aborts abort_remote(). lostpeer() is called because if the user is
* too impatient to wait or there's another problem then ftp really
* needs to get back to a known state.
*/
static void
abort_squared(int signo)
{
char msgbuf[100];
size_t len;
sigint_raised = 1;
alarmtimer(0);
len = strlcpy(msgbuf, "\nremote abort aborted; closing connection.\n",
sizeof(msgbuf));
write(fileno(ttyout), msgbuf, len);
lostpeer(signo);
siglongjmp(xferabort, 1);
}
void
abort_remote(FILE *din)
{
unsigned char buf[BUFSIZ];
int nfnd;
if (cout == NULL) {
warnx("Lost control connection for abort");
if (ptabflg)
code = -1;
lostpeer(0);
return;
}
/*
* send IAC in urgent mode instead of DM because 4.3BSD places oob mark
* after urgent byte rather than before as is protocol now
*/
buf[0] = IAC;
buf[1] = IP;
buf[2] = IAC;
if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
warn("Can't send abort message");
fprintf(cout, "%cABOR\r\n", DM);
(void)fflush(cout);
if ((nfnd = empty(cin, din, 10)) <= 0) {
if (nfnd < 0)
warn("Can't send abort message");
if (ptabflg)
code = -1;
lostpeer(0);
}
if (din && (nfnd & 2)) {
while (read(fileno(din), buf, BUFSIZ) > 0)
continue;
}
if (getreply(0) == ERROR && code == 552) {
/* 552 needed for nic style abort */
(void)getreply(0);
}
(void)getreply(0);
}
/*
* Ensure that ai->ai_addr is NOT an IPv4 mapped address.
* IPv4 mapped address complicates too many things in FTP
* protocol handling, as FTP protocol is defined differently
* between IPv4 and IPv6.
*
* This may not be the best way to handle this situation,
* since the semantics of IPv4 mapped address is defined in
* the kernel. There are configurations where we should use
* IPv4 mapped address as native IPv6 address, not as
* "an IPv6 address that embeds IPv4 address" (namely, SIIT).
*
* More complete solution would be to have an additional
* getsockopt to grab "real" peername/sockname. "real"
* peername/sockname will be AF_INET if IPv4 mapped address
* is used to embed IPv4 address, and will be AF_INET6 if
* we use it as native. What a mess!
*/
void
ai_unmapped(struct addrinfo *ai)
{
#ifdef INET6
struct sockaddr_in6 *sin6;
struct sockaddr_in sin;
socklen_t len;
if (ai->ai_family != AF_INET6)
return;
if (ai->ai_addrlen != sizeof(struct sockaddr_in6) ||
sizeof(sin) > ai->ai_addrlen)
return;
sin6 = (struct sockaddr_in6 *)(void *)ai->ai_addr;
if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
len = sizeof(struct sockaddr_in);
memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
sizeof(sin.sin_addr));
sin.sin_port = sin6->sin6_port;
ai->ai_family = AF_INET;
#if defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN)
sin.sin_len = len;
#endif
memcpy(ai->ai_addr, &sin, len);
ai->ai_addrlen = len;
#endif
}
#ifdef NO_USAGE
void
xusage(void)
{
fputs("Usage error\n", ttyout);
}
#endif
