Most of the beginners would wonder how the known services work. Well this post will give an overview of one of the well-written services in C , the FTP application. I thought that there is no need to re-invent the wheel and use this code as is from Apple's open source initiative.The code is written in C.
I am providing the code only for the main file which contains FTP specific functions.
The rest of the supporting files including the Makefile can be downloaded from here.Disclaimer : This code is taken from Apple Opensource . I don't want Apple to sue me ;)
/*ftp.c*/
/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
* Reserved. This file contains Original Code and/or Modifications of
* Original Code as defined in and that are subject to the Apple Public
* Source License Version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. Please obtain a copy of the
* License at http://www.apple.com/publicsource and read it before using
* this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License."
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* 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. 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.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/file.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 <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include "ftp_var.h"
extern int h_errno;
struct sockaddr_in hisctladdr;
struct sockaddr_in data_addr;
int data = -1;
int abrtflag = 0;
jmp_buf ptabort;
int ptabflg;
int ptflag = 0;
struct sockaddr_in myctladdr;
off_t restart_point = 0;
FILE *cin, *cout;
char *
hookup(host, port)
char *host;
int port;
{
struct hostent *hp = 0;
int s, len, tos;
static char hostnamebuf[80];
memset((char *)&hisctladdr, 0, sizeof (hisctladdr));
hisctladdr.sin_addr.s_addr = inet_addr(host);
if (hisctladdr.sin_addr.s_addr != -1) {
hisctladdr.sin_family = AF_INET;
(void) strncpy(hostnamebuf, host, sizeof(hostnamebuf));
} else {
hp = gethostbyname(host);
if (hp == NULL) {
warnx("%s: %s", host, hstrerror(h_errno));
code = -1;
return ((char *) 0);
}
hisctladdr.sin_family = hp->h_addrtype;
memmove((caddr_t)&hisctladdr.sin_addr,
hp->h_addr_list[0], hp->h_length);
(void) strncpy(hostnamebuf, hp->h_name, sizeof(hostnamebuf));
}
hostname = hostnamebuf;
s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
if (s < 0) {
warn("socket");
code = -1;
return (0);
}
hisctladdr.sin_port = port;
while (connect(s, (struct sockaddr *)&hisctladdr, sizeof (hisctladdr)) < 0) {
if (hp && hp->h_addr_list[1]) {
int oerrno = errno;
char *ia;
ia = inet_ntoa(hisctladdr.sin_addr);
errno = oerrno;
warn("connect to address %s", ia);
hp->h_addr_list++;
memmove((caddr_t)&hisctladdr.sin_addr,
hp->h_addr_list[0], hp->h_length);
fprintf(stdout, "Trying %s...\n",
inet_ntoa(hisctladdr.sin_addr));
(void) close(s);
s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
if (s < 0) {
warn("socket");
code = -1;
return (0);
}
continue;
}
warn("connect");
code = -1;
goto bad;
}
len = sizeof (myctladdr);
if (getsockname(s, (struct sockaddr *)&myctladdr, &len) < 0) {
warn("getsockname");
code = -1;
goto bad;
}
#ifdef IP_TOS
tos = IPTOS_LOWDELAY;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
warn("setsockopt TOS (ignored)");
#endif
cin = fdopen(s, "r");
cout = fdopen(s, "w");
if (cin == NULL || cout == NULL) {
warnx("fdopen failed.");
if (cin)
(void) fclose(cin);
if (cout)
(void) fclose(cout);
code = -1;
goto bad;
}
if (verbose)
printf("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;
}
#ifdef SO_OOBINLINE
{
int on = 1;
if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on))
< 0 && debug) {
warn("setsockopt");
}
}
#endif /* SO_OOBINLINE */
return (hostname);
bad:
(void) close(s);
return ((char *)0);
}
int
login(host)
char *host;
{
char tmp[80];
char *user, *pass, *acct;
int n, aflag = 0;
user = pass = acct = 0;
if (ruserpass(host, &user, &pass, &acct) < 0) {
code = -1;
return (0);
}
while (user == NULL) {
char *myname = getlogin();
if (myname == NULL) {
struct passwd *pp = getpwuid(getuid());
if (pp != NULL)
myname = pp->pw_name;
}
if (myname)
printf("Name (%s:%s): ", host, myname);
else
printf("Name (%s): ", host);
(void) fgets(tmp, sizeof(tmp) - 1, stdin);
tmp[strlen(tmp) - 1] = '\0';
if (*tmp == '\0')
user = myname;
else
user = tmp;
}
n = command("USER %s", user);
if (n == CONTINUE) {
if (pass == NULL)
pass = getpass("Password:");
n = command("PASS %s", pass);
}
if (n == CONTINUE) {
aflag++;
acct = getpass("Account:");
n = command("ACCT %s", acct);
}
if (n != COMPLETE) {
warnx("Login failed.");
return (0);
}
if (!aflag && acct != NULL)
(void) command("ACCT %s", acct);
if (proxy)
return (1);
for (n = 0; n < macnum; ++n) {
if (!strcmp("init", macros[n].mac_name)) {
(void) strcpy(line, "$init");
makeargv();
domacro(margc, margv);
break;
}
}
return (1);
}
void
cmdabort()
{
printf("\n");
(void) fflush(stdout);
abrtflag++;
if (ptflag)
longjmp(ptabort,1);
}
int command(const char *fmt, ...)
{
va_list ap;
int r;
sig_t oldintr;
abrtflag = 0;
if (debug) {
printf("---> ");
va_start(ap, fmt);
if (strncmp("PASS ", fmt, 5) == 0)
printf("PASS XXXX");
else
vfprintf(stdout, fmt, ap);
va_end(ap);
printf("\n");
(void) fflush(stdout);
}
if (cout == NULL) {
warn("No control connection for command");
code = -1;
return (0);
}
oldintr = signal(SIGINT, cmdabort);
va_start(ap, fmt);
vfprintf(cout, fmt, ap);
va_end(ap);
fprintf(cout, "\r\n");
(void) fflush(cout);
cpend = 1;
r = getreply(!strcmp(fmt, "QUIT"));
if (abrtflag && oldintr != SIG_IGN)
(*oldintr)(SIGINT);
(void) signal(SIGINT, oldintr);
return (r);
}
char reply_string[BUFSIZ]; /* last line of previous reply */
int
getreply(expecteof)
int expecteof;
{
int c, n;
int dig;
int originalcode = 0, continuation = 0;
sig_t oldintr;
int pflag = 0;
char *cp, *pt = pasv;
oldintr = signal(SIGINT, cmdabort);
for (;;) {
dig = n = code = 0;
cp = reply_string;
while ((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) {
if (expecteof) {
(void) signal(SIGINT,oldintr);
code = 221;
return (0);
}
lostpeer();
if (verbose) {
printf("421 Service not available, remote server has closed connection\n");
(void) fflush(stdout);
}
code = 421;
return (4);
}
if (c != '\r' && (verbose > 0 ||
(verbose > -1 && n == '5' && dig > 4))) {
if (proxflag &&
(dig == 1 || dig == 5 && verbose == 0))
printf("%s:",hostname);
(void) putchar(c);
}
if (dig < 4 && isdigit(c))
code = code * 10 + (c - '0');
if (!pflag && code == 227)
pflag = 1;
if (dig > 4 && pflag == 1 && isdigit(c))
pflag = 2;
if (pflag == 2) {
if (c != '\r' && c != ')')
*pt++ = c;
else {
*pt = '\0';
pflag = 3;
}
}
if (dig == 4 && c == '-') {
if (continuation)
code = 0;
continuation++;
}
if (n == 0)
n = c;
if (cp < &reply_string[sizeof(reply_string) - 1])
*cp++ = c;
}
if (verbose > 0 || verbose > -1 && n == '5') {
(void) putchar(c);
(void) fflush (stdout);
}
if (continuation && code != originalcode) {
if (originalcode == 0)
originalcode = code;
continue;
}
*cp = '\0';
if (n != '1')
cpend = 0;
(void) signal(SIGINT,oldintr);
if (code == 421 || originalcode == 421)
lostpeer();
if (abrtflag && oldintr != cmdabort && oldintr != SIG_IGN)
(*oldintr)(SIGINT);
return (n - '0');
}
}
int
empty(mask, sec)
struct fd_set *mask;
int sec;
{
struct timeval t;
t.tv_sec = (long) sec;
t.tv_usec = 0;
return (select(32, mask, (struct fd_set *) 0, (struct fd_set *) 0, &t));
}
jmp_buf sendabort;
void
abortsend()
{
mflag = 0;
abrtflag = 0;
printf("\nsend aborted\nwaiting for remote to finish abort\n");
(void) fflush(stdout);
longjmp(sendabort, 1);
}
#define HASHBYTES 1024
void
sendrequest(cmd, local, remote, printnames)
char *cmd, *local, *remote;
int printnames;
{
struct stat st;
struct timeval start, stop;
int c, d;
FILE *fin, *dout = 0, *popen();
int (*closefunc) __P((FILE *));
sig_t oldintr, oldintp;
long bytes = 0, hashbytes = HASHBYTES;
char *lmode, buf[BUFSIZ], *bufp;
if (verbose && printnames) {
if (local && *local != '-')
printf("local: %s ", local);
if (remote)
printf("remote: %s\n", remote);
}
if (proxy) {
proxtrans(cmd, local, remote);
return;
}
if (curtype != type)
changetype(type, 0);
closefunc = NULL;
oldintr = NULL;
oldintp = NULL;
lmode = "w";
if (setjmp(sendabort)) {
while (cpend) {
(void) getreply(0);
}
if (data >= 0) {
(void) close(data);
data = -1;
}
if (oldintr)
(void) signal(SIGINT,oldintr);
if (oldintp)
(void) signal(SIGPIPE,oldintp);
code = -1;
return;
}
oldintr = signal(SIGINT, abortsend);
if (strcmp(local, "-") == 0)
fin = stdin;
else if (*local == '|') {
oldintp = signal(SIGPIPE,SIG_IGN);
fin = popen(local + 1, "r");
if (fin == NULL) {
warn("%s", local + 1);
(void) signal(SIGINT, oldintr);
(void) signal(SIGPIPE, oldintp);
code = -1;
return;
}
closefunc = pclose;
} else {
fin = fopen(local, "r");
if (fin == NULL) {
warn("local: %s", local);
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
closefunc = fclose;
if (fstat(fileno(fin), &st) < 0 ||
(st.st_mode&S_IFMT) != S_IFREG) {
fprintf(stdout, "%s: not a plain file.\n", local);
(void) signal(SIGINT, oldintr);
fclose(fin);
code = -1;
return;
}
}
if (initconn()) {
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
code = -1;
if (closefunc != NULL)
(*closefunc)(fin);
return;
}
if (setjmp(sendabort))
goto abort;
if (restart_point &&
(strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) {
int rc;
switch (curtype) {
case TYPE_A:
rc = fseek(fin, (long) restart_point, SEEK_SET);
break;
case TYPE_I:
case TYPE_L:
rc = lseek(fileno(fin), restart_point, SEEK_SET);
break;
}
if (rc < 0) {
warn("local: %s", local);
restart_point = 0;
if (closefunc != NULL)
(*closefunc)(fin);
return;
}
if (command("REST %ld", (long) restart_point)
!= CONTINUE) {
restart_point = 0;
if (closefunc != NULL)
(*closefunc)(fin);
return;
}
restart_point = 0;
lmode = "r+w";
}
if (remote) {
if (command("%s %s", cmd, remote) != PRELIM) {
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
if (closefunc != NULL)
(*closefunc)(fin);
return;
}
} else
if (command("%s", cmd) != PRELIM) {
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
if (closefunc != NULL)
(*closefunc)(fin);
return;
}
dout = dataconn(lmode);
if (dout == NULL)
goto abort;
(void) gettimeofday(&start, (struct timezone *)0);
oldintp = signal(SIGPIPE, SIG_IGN);
switch (curtype) {
case TYPE_I:
case TYPE_L:
errno = d = 0;
while ((c = read(fileno(fin), buf, sizeof (buf))) > 0) {
bytes += c;
for (bufp = buf; c > 0; c -= d, bufp += d)
if ((d = write(fileno(dout), bufp, c)) <= 0)
break;
if (hash) {
while (bytes >= hashbytes) {
(void) putchar('#');
hashbytes += HASHBYTES;
}
(void) fflush(stdout);
}
}
if (hash && bytes > 0) {
if (bytes < HASHBYTES)
(void) putchar('#');
(void) putchar('\n');
(void) fflush(stdout);
}
if (c < 0)
warn("local: %s", local);
if (d < 0) {
if (errno != EPIPE)
warn("netout");
bytes = -1;
}
break;
case TYPE_A:
while ((c = getc(fin)) != EOF) {
if (c == '\n') {
while (hash && (bytes >= hashbytes)) {
(void) putchar('#');
(void) fflush(stdout);
hashbytes += HASHBYTES;
}
if (ferror(dout))
break;
(void) putc('\r', dout);
bytes++;
}
(void) putc(c, dout);
bytes++;
/* if (c == '\r') { */
/* (void) putc('\0', dout); // this violates rfc */
/* bytes++; */
/* } */
}
if (hash) {
if (bytes < hashbytes)
(void) putchar('#');
(void) putchar('\n');
(void) fflush(stdout);
}
if (ferror(fin))
warn("local: %s", local);
if (ferror(dout)) {
if (errno != EPIPE)
warn("netout");
bytes = -1;
}
break;
}
if (closefunc != NULL)
(*closefunc)(fin);
(void) fclose(dout);
(void) gettimeofday(&stop, (struct timezone *)0);
(void) getreply(0);
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
if (bytes > 0)
ptransfer("sent", bytes, &start, &stop);
return;
abort:
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
if (!cpend) {
code = -1;
return;
}
if (data >= 0) {
(void) close(data);
data = -1;
}
if (dout)
(void) fclose(dout);
(void) getreply(0);
code = -1;
if (closefunc != NULL && fin != NULL)
(*closefunc)(fin);
(void) gettimeofday(&stop, (struct timezone *)0);
if (bytes > 0)
ptransfer("sent", bytes, &start, &stop);
}
jmp_buf recvabort;
void
abortrecv()
{
mflag = 0;
abrtflag = 0;
printf("\nreceive aborted\nwaiting for remote to finish abort\n");
(void) fflush(stdout);
longjmp(recvabort, 1);
}
void
recvrequest(cmd, local, remote, lmode, printnames)
char *cmd, *local, *remote, *lmode;
int printnames;
{
FILE *fout, *din = 0;
int (*closefunc) __P((FILE *));
sig_t oldintr, oldintp;
int c, d, is_retr, tcrflag, bare_lfs = 0;
static int bufsize;
static char *buf;
long bytes = 0, hashbytes = HASHBYTES;
struct timeval start, stop;
struct stat st;
is_retr = strcmp(cmd, "RETR") == 0;
if (is_retr && verbose && printnames) {
if (local && *local != '-')
printf("local: %s ", local);
if (remote)
printf("remote: %s\n", remote);
}
if (proxy && is_retr) {
proxtrans(cmd, local, remote);
return;
}
closefunc = NULL;
oldintr = NULL;
oldintp = NULL;
tcrflag = !crflag && is_retr;
if (setjmp(recvabort)) {
while (cpend) {
(void) getreply(0);
}
if (data >= 0) {
(void) close(data);
data = -1;
}
if (oldintr)
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
oldintr = signal(SIGINT, abortrecv);
if (strcmp(local, "-") && *local != '|') {
if (access(local, 2) < 0) {
char *dir = strrchr(local, '/');
if (errno != ENOENT && errno != EACCES) {
warn("local: %s", local);
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
if (dir != NULL)
*dir = 0;
d = access(dir ? local : ".", 2);
if (dir != NULL)
*dir = '/';
if (d < 0) {
warn("local: %s", local);
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
if (!runique && errno == EACCES &&
chmod(local, 0600) < 0) {
warn("local: %s", local);
(void) signal(SIGINT, oldintr);
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
if (runique && errno == EACCES &&
(local = gunique(local)) == NULL) {
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
}
else if (runique && (local = gunique(local)) == NULL) {
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
}
if (!is_retr) {
if (curtype != TYPE_A)
changetype(TYPE_A, 0);
} else if (curtype != type)
changetype(type, 0);
if (initconn()) {
(void) signal(SIGINT, oldintr);
code = -1;
return;
}
if (setjmp(recvabort))
goto abort;
if (is_retr && restart_point &&
command("REST %ld", (long) restart_point) != CONTINUE)
return;
if (remote) {
if (command("%s %s", cmd, remote) != PRELIM) {
(void) signal(SIGINT, oldintr);
return;
}
} else {
if (command("%s", cmd) != PRELIM) {
(void) signal(SIGINT, oldintr);
return;
}
}
din = dataconn("r");
if (din == NULL)
goto abort;
if (strcmp(local, "-") == 0)
fout = stdout;
else if (*local == '|') {
oldintp = signal(SIGPIPE, SIG_IGN);
fout = popen(local + 1, "w");
if (fout == NULL) {
warn("%s", local+1);
goto abort;
}
closefunc = pclose;
} else {
fout = fopen(local, lmode);
if (fout == NULL) {
warn("local: %s", local);
goto abort;
}
closefunc = fclose;
}
if (fstat(fileno(fout), &st) < 0 || st.st_blksize == 0)
st.st_blksize = BUFSIZ;
if (st.st_blksize > bufsize) {
if (buf)
(void) free(buf);
buf = malloc((unsigned)st.st_blksize);
if (buf == NULL) {
warn("malloc");
bufsize = 0;
goto abort;
}
bufsize = st.st_blksize;
}
(void) gettimeofday(&start, (struct timezone *)0);
switch (curtype) {
case TYPE_I:
case TYPE_L:
if (restart_point &&
lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
warn("local: %s", local);
if (closefunc != NULL)
(*closefunc)(fout);
return;
}
errno = d = 0;
while ((c = read(fileno(din), buf, bufsize)) > 0) {
if ((d = write(fileno(fout), buf, c)) != c)
break;
bytes += c;
if (hash) {
while (bytes >= hashbytes) {
(void) putchar('#');
hashbytes += HASHBYTES;
}
(void) fflush(stdout);
}
}
if (hash && bytes > 0) {
if (bytes < HASHBYTES)
(void) putchar('#');
(void) putchar('\n');
(void) fflush(stdout);
}
if (c < 0) {
if (errno != EPIPE)
warn("netin");
bytes = -1;
}
if (d < c) {
if (d < 0)
warn("local: %s", local);
else
warnx("%s: short write", local);
}
break;
case TYPE_A:
if (restart_point) {
int i, n, ch;
if (fseek(fout, 0L, SEEK_SET) < 0)
goto done;
n = restart_point;
for (i = 0; i++ < n;) {
if ((ch = getc(fout)) == EOF)
goto done;
if (ch == '\n')
i++;
}
if (fseek(fout, 0L, SEEK_CUR) < 0) {
done:
warn("local: %s", local);
if (closefunc != NULL)
(*closefunc)(fout);
return;
}
}
while ((c = getc(din)) != EOF) {
if (c == '\n')
bare_lfs++;
while (c == '\r') {
while (hash && (bytes >= hashbytes)) {
(void) putchar('#');
(void) fflush(stdout);
hashbytes += HASHBYTES;
}
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 (bare_lfs) {
printf("WARNING! %d bare linefeeds received in ASCII mode\n", bare_lfs);
printf("File may not have transferred correctly.\n");
}
if (hash) {
if (bytes < hashbytes)
(void) putchar('#');
(void) putchar('\n');
(void) fflush(stdout);
}
if (ferror(din)) {
if (errno != EPIPE)
warn("netin");
bytes = -1;
}
if (ferror(fout))
warn("local: %s", local);
break;
}
if (closefunc != NULL)
(*closefunc)(fout);
(void) signal(SIGINT, oldintr);
if (oldintp)
(void) signal(SIGPIPE, oldintp);
(void) fclose(din);
(void) gettimeofday(&stop, (struct timezone *)0);
(void) getreply(0);
if (bytes > 0 && is_retr)
ptransfer("received", bytes, &start, &stop);
return;
abort:
/* abort using RFC959 recommended IP,SYNC sequence */
if (oldintp)
(void) signal(SIGPIPE, oldintr);
(void) signal(SIGINT, SIG_IGN);
if (!cpend) {
code = -1;
(void) signal(SIGINT, oldintr);
return;
}
abort_remote(din);
code = -1;
if (data >= 0) {
(void) close(data);
data = -1;
}
if (closefunc != NULL && fout != NULL)
(*closefunc)(fout);
if (din)
(void) fclose(din);
(void) gettimeofday(&stop, (struct timezone *)0);
if (bytes > 0)
ptransfer("received", bytes, &start, &stop);
(void) signal(SIGINT, oldintr);
}
/*
* Need to start a listen on the data channel before we send the command,
* otherwise the server's connect may fail.
*/
int
initconn()
{
char *p, *a;
int result, len, tmpno = 0;
int on = 1;
int a0, a1, a2, a3, p0, p1;
if (passivemode) {
data = socket(AF_INET, SOCK_STREAM, 0);
if (data < 0) {
perror("ftp: socket");
return(1);
}
if ((options & SO_DEBUG) &&
setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on,
sizeof (on)) < 0)
perror("ftp: setsockopt (ignored)");
if (command("PASV") != COMPLETE) {
printf("Passive mode refused.\n");
goto bad;
}
/*
* What we've got at this point is a string of comma
* separated one-byte unsigned integer values.
* The first four are the an IP address. The fifth is
* the MSB of the port number, the sixth is the LSB.
* From that we'll prepare a sockaddr_in.
*/
if (sscanf(pasv,"%d,%d,%d,%d,%d,%d",
&a0, &a1, &a2, &a3, &p0, &p1) != 6) {
printf("Passive mode address scan failure. "
"Shouldn't happen!\n");
goto bad;
}
bzero(&data_addr, sizeof(data_addr));
data_addr.sin_family = AF_INET;
a = (char *)&data_addr.sin_addr.s_addr;
a[0] = a0 & 0xff;
a[1] = a1 & 0xff;
a[2] = a2 & 0xff;
a[3] = a3 & 0xff;
p = (char *)&data_addr.sin_port;
p[0] = p0 & 0xff;
p[1] = p1 & 0xff;
if (connect(data, (struct sockaddr *)&data_addr,
sizeof(data_addr)) < 0) {
perror("ftp: connect");
goto bad;
}
#ifdef IP_TOS
on = IPTOS_THROUGHPUT;
if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on,
sizeof(int)) < 0)
perror("ftp: setsockopt TOS (ignored)");
#endif
return(0);
}
noport:
data_addr = myctladdr;
if (sendport)
data_addr.sin_port = 0; /* let system pick one */
if (data != -1)
(void) close(data);
data = socket(AF_INET, SOCK_STREAM, 0);
if (data < 0) {
warn("socket");
if (tmpno)
sendport = 1;
return (1);
}
if (!sendport)
if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof (on)) < 0) {
warn("setsockopt (reuse address)");
goto bad;
}
if (bind(data, (struct sockaddr *)&data_addr, sizeof (data_addr)) < 0) {
warn("bind");
goto bad;
}
if (options & SO_DEBUG &&
setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof (on)) < 0)
warn("setsockopt (ignored)");
len = sizeof (data_addr);
if (getsockname(data, (struct sockaddr *)&data_addr, &len) < 0) {
warn("getsockname");
goto bad;
}
if (listen(data, 1) < 0)
warn("listen");
if (sendport) {
a = (char *)&data_addr.sin_addr;
p = (char *)&data_addr.sin_port;
#define UC(b) (((int)b)&0xff)
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]));
if (result == ERROR && sendport == -1) {
sendport = 0;
tmpno = 1;
goto noport;
}
return (result != COMPLETE);
}
if (tmpno)
sendport = 1;
#ifdef IP_TOS
on = IPTOS_THROUGHPUT;
if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
warn("setsockopt TOS (ignored)");
#endif
return (0);
bad:
(void) close(data), data = -1;
if (tmpno)
sendport = 1;
return (1);
}
FILE *
dataconn(lmode)
char *lmode;
{
struct sockaddr_in from;
int s, fromlen = sizeof (from), tos;
if (passivemode)
return (fdopen(data, lmode));
s = accept(data, (struct sockaddr *) &from, &fromlen);
if (s < 0) {
warn("accept");
(void) close(data), data = -1;
return (NULL);
}
(void) close(data);
data = s;
#ifdef IP_TOS
tos = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
warn("setsockopt TOS (ignored)");
#endif
return (fdopen(data, lmode));
}
void
ptransfer(direction, bytes, t0, t1)
char *direction;
long bytes;
struct timeval *t0, *t1;
{
struct timeval td;
float s;
long bs;
if (verbose) {
tvsub(&td, t1, t0);
s = td.tv_sec + (td.tv_usec / 1000000.);
#define nz(x) ((x) == 0 ? 1 : (x))
bs = bytes / nz(s);
printf("%ld bytes %s in %.3g seconds (%ld bytes/s)\n",
bytes, direction, s, bs);
}
}
/*
void
tvadd(tsum, t0)
struct timeval *tsum, *t0;
{
tsum->tv_sec += t0->tv_sec;
tsum->tv_usec += t0->tv_usec;
if (tsum->tv_usec > 1000000)
tsum->tv_sec++, tsum->tv_usec -= 1000000;
}
*/
void
tvsub(tdiff, t1, t0)
struct timeval *tdiff, *t1, *t0;
{
tdiff->tv_sec = t1->tv_sec - t0->tv_sec;
tdiff->tv_usec = t1->tv_usec - t0->tv_usec;
if (tdiff->tv_usec < 0)
tdiff->tv_sec--, tdiff->tv_usec += 1000000;
}
void
psabort()
{
abrtflag++;
}
void
pswitch(flag)
int flag;
{
sig_t oldintr;
static struct comvars {
int connect;
char name[MAXHOSTNAMELEN];
struct sockaddr_in mctl;
struct sockaddr_in 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 = signal(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) strncpy(ip->name, hostname, sizeof(ip->name) - 1);
ip->name[strlen(ip->name)] = '\0';
} 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) strncpy(ip->nti, ntin, 16);
(ip->nti)[strlen(ip->nti)] = '\0';
(void) strcpy(ntin, op->nti);
(void) strncpy(ip->nto, ntout, 16);
(ip->nto)[strlen(ip->nto)] = '\0';
(void) strcpy(ntout, op->nto);
ip->mapflg = mapflag;
mapflag = op->mapflg;
(void) strncpy(ip->mi, mapin, MAXPATHLEN - 1);
(ip->mi)[strlen(ip->mi)] = '\0';
(void) strcpy(mapin, op->mi);
(void) strncpy(ip->mo, mapout, MAXPATHLEN - 1);
(ip->mo)[strlen(ip->mo)] = '\0';
(void) strcpy(mapout, op->mo);
(void) signal(SIGINT, oldintr);
if (abrtflag) {
abrtflag = 0;
(*oldintr)(SIGINT);
}
}
void
abortpt()
{
printf("\n");
(void) fflush(stdout);
ptabflg++;
mflag = 0;
abrtflag = 0;
longjmp(ptabort, 1);
}
void
proxtrans(cmd, local, remote)
char *cmd, *local, *remote;
{
sig_t oldintr;
int secndflag = 0, prox_type, nfnd;
char *cmd2;
struct fd_set mask;
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) {
printf("proxy server does not support third party transfers.\n");
return;
}
pswitch(0);
if (!connected) {
printf("No primary connection\n");
pswitch(1);
code = -1;
return;
}
if (curtype != prox_type)
changetype(prox_type, 1);
if (command("PORT %s", pasv) != COMPLETE) {
pswitch(1);
return;
}
if (setjmp(ptabort))
goto abort;
oldintr = signal(SIGINT, abortpt);
if (command("%s %s", cmd, remote) != PRELIM) {
(void) signal(SIGINT, oldintr);
pswitch(1);
return;
}
sleep(2);
pswitch(1);
secndflag++;
if (command("%s %s", cmd2, local) != PRELIM)
goto abort;
ptflag++;
(void) getreply(0);
pswitch(0);
(void) getreply(0);
(void) signal(SIGINT, oldintr);
pswitch(1);
ptflag = 0;
printf("local: %s remote: %s\n", local, remote);
return;
abort:
(void) signal(SIGINT, SIG_IGN);
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((FILE *) NULL);
}
pswitch(1);
if (ptabflg)
code = -1;
(void) signal(SIGINT, oldintr);
return;
}
if (cpend)
abort_remote((FILE *) 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((FILE *) NULL);
pswitch(1);
if (ptabflg)
code = -1;
(void) signal(SIGINT, oldintr);
return;
}
}
if (cpend)
abort_remote((FILE *) NULL);
pswitch(!proxy);
if (cpend) {
FD_ZERO(&mask);
FD_SET(fileno(cin), &mask);
if ((nfnd = empty(&mask, 10)) <= 0) {
if (nfnd < 0) {
warn("abort");
}
if (ptabflg)
code = -1;
lostpeer();
}
(void) getreply(0);
(void) getreply(0);
}
if (proxy)
pswitch(0);
pswitch(1);
if (ptabflg)
code = -1;
(void) signal(SIGINT, oldintr);
}
void
reset(argc, argv)
int argc;
char *argv[];
{
struct fd_set mask;
int nfnd = 1;
FD_ZERO(&mask);
while (nfnd > 0) {
FD_SET(fileno(cin), &mask);
if ((nfnd = empty(&mask,0)) < 0) {
warn("reset");
code = -1;
lostpeer();
}
else if (nfnd) {
(void) getreply(0);
}
}
}
char *
gunique(local)
char *local;
{
static char new[MAXPATHLEN];
char *cp = strrchr(local, '/');
int d, count=0;
char ext = '1';
if (cp)
*cp = '\0';
d = access(cp ? local : ".", 2);
if (cp)
*cp = '/';
if (d < 0) {
warn("local: %s", local);
return ((char *) 0);
}
(void) strcpy(new, local);
cp = new + strlen(new);
*cp++ = '.';
while (!d) {
if (++count == 100) {
printf("runique: can't find unique file name.\n");
return ((char *) 0);
}
*cp++ = ext;
*cp = '\0';
if (ext == '9')
ext = '0';
else
ext++;
if ((d = access(new, 0)) < 0)
break;
if (ext != '0')
cp--;
else if (*(cp - 2) == '.')
*(cp - 1) = '1';
else {
*(cp - 2) = *(cp - 2) + 1;
cp--;
}
}
return (new);
}
void
abort_remote(din)
FILE *din;
{
char buf[BUFSIZ];
int nfnd;
struct fd_set mask;
/*
* send IAC in urgent mode instead of DM because 4.3BSD places oob mark
* after urgent byte rather than before as is protocol now
*/
sprintf(buf, "%c%c%c", IAC, IP, IAC);
if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
warn("abort");
fprintf(cout,"%cABOR\r\n", DM);
(void) fflush(cout);
FD_ZERO(&mask);
FD_SET(fileno(cin), &mask);
if (din) {
FD_SET(fileno(din), &mask);
}
if ((nfnd = empty(&mask, 10)) <= 0) {
if (nfnd < 0) {
warn("abort");
}
if (ptabflg)
code = -1;
lostpeer();
}
if (din && FD_ISSET(fileno(din), &mask)) {
while (read(fileno(din), buf, BUFSIZ) > 0)
/* LOOP */;
}
if (getreply(0) == ERROR && code == 552) {
/* 552 needed for nic style abort */
(void) getreply(0);
}
(void) getreply(0);
}
