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/*
* Copyright (c) 1985, 1988, 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1985, 1988, 1990 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)ftpd.c 5.37 (Berkeley) 6/27/90";
#endif /* not lint */
/*
* FTP server.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <sys/dir.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#define FTP_NAMES
#include <arpa/ftp.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>
#include <ctype.h>
#include <stdio.h>
#include <signal.h>
#include <pwd.h>
#include <setjmp.h>
#include <netdb.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <varargs.h>
#include "pathnames.h"
#include "extensions.h"
/*
* File containing login names
* NOT to be used on this machine.
* Commonly used to disallow uucp.
*/
extern int errno;
extern char *ctime();
extern char *crypt();
extern char version[];
extern char *home; /* pointer to home directory for glob */
extern FILE *ftpd_popen(), *fopen(), *freopen();
extern int ftpd_pclose(), fclose();
extern char *getline(), *realpath();
extern char cbuf[];
extern off_t restart_point;
struct sockaddr_in ctrl_addr;
struct sockaddr_in data_source;
struct sockaddr_in data_dest;
struct sockaddr_in his_addr;
struct sockaddr_in pasv_addr;
int data;
jmp_buf errcatch, urgcatch;
int logged_in;
struct passwd *pw;
int debug;
int timeout = 900; /* timeout after 15 minutes of inactivity */
int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
int logging;
int cmdlogging;
int anonymous;
int guest;
int type;
int form;
int stru; /* avoid C keyword */
int mode;
int usedefault = 1; /* for data transfers */
int pdata = -1; /* for passive mode */
int transflag;
off_t file_size;
off_t byte_count;
#if !defined(CMASK) || CMASK == 0
#undef CMASK
#define CMASK 027
#endif
int defumask = CMASK; /* default umask value */
char tmpline[7];
char hostname[MAXHOSTNAMELEN];
char remotehost[MAXHOSTNAMELEN];
char remoteaddr[MAXHOSTNAMELEN];
/* Access control and logging passwords */
int use_accessfile = 1;
char guestpw[MAXHOSTNAMELEN];
char privatepw[MAXHOSTNAMELEN];
int nameserved;
extern char authuser[];
extern int authenticated;
/* File transfer logging */
int xferlog = 0;
int log_outbound_xfers = 0;
int log_incoming_xfers = 0;
/* Allow use of lreply(); this is here since some older FTP clients don't
* support continuation messages. In violation of the RFCs... */
int dolreplies = 1;
/* Spontaneous reply text. To be sent along with next reply to user */
char *autospout = NULL;
int autospout_free = 0;
/* allowed on-the-fly file manipulations (compress, tar) */
int mangleopts = 0;
/* number of login failures before attempts are logged and FTP *EXITS* */
int lgi_failure_threshold = 5;
/*
* Timeout intervals for retrying connections
* to hosts that don't accept PORT cmds. This
* is a kludge, but given the problems with TCP...
*/
#define SWAITMAX 90 /* wait at most 90 seconds */
#define SWAITINT 5 /* interval between retries */
#define S_ISDIR(m) (((m)&S_IFMT) == S_IFDIR)
#define S_ISREG(m) (((m)&S_IFMT) == S_IFREG)
int swaitmax = SWAITMAX;
int swaitint = SWAITINT;
int lostconn();
int myoob();
FILE *getdatasock(), *dataconn();
#ifdef SETPROCTITLE
char **Argv = NULL; /* pointer to argument vector */
char *LastArgv = NULL; /* end of argv */
char proctitle[BUFSIZ]; /* initial part of title */
#endif /* SETPROCTITLE */
main(argc, argv, envp)
int argc;
char *argv[];
char **envp;
{
int addrlen, on = 1, tos;
char *cp;
addrlen = sizeof (his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
#ifndef DEBUG
exit(1);
#endif
}
addrlen = sizeof (ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
#ifndef DEBUG
exit(1);
#endif
}
#ifdef IP_TOS
tos = IPTOS_LOWDELAY;
if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif
data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
debug = 0;
#ifdef LOG_DAEMON
openlog("ftpd", LOG_PID, LOG_DAEMON);
#else
openlog("ftpd", LOG_PID);
#endif
#ifdef SETPROCTITLE
/*
* Save start and extent of argv for setproctitle.
*/
Argv = argv;
while (*envp)
envp++;
LastArgv = envp[-1] + strlen(envp[-1]);
#endif /* SETPROCTITLE */
argc--, argv++;
while (argc > 0 && *argv[0] == '-') {
for (cp = &argv[0][1]; *cp; cp++) switch (*cp) {
case 'a':
use_accessfile = 1;
break;
case 'A':
use_accessfile = 0;
break;
case 'v':
debug = 1;
break;
case 'd':
debug = 1;
break;
case 'l':
logging = 1;
break;
case 'L':
cmdlogging = 1;
break;
case 'i':
log_incoming_xfers = 1;
break;
case 'o':
log_outbound_xfers = 1;
break;
case 't':
timeout = atoi(++cp);
if (maxtimeout < timeout)
maxtimeout = timeout;
goto nextopt;
case 'T':
maxtimeout = atoi(++cp);
if (timeout > maxtimeout)
timeout = maxtimeout;
goto nextopt;
case 'u':
{
int val = 0;
while (*++cp && *cp >= '0' && *cp <= '9')
val = val*8 + *cp - '0';
if (*cp)
fprintf(stderr, "ftpd: Bad value for -u\n");
else
defumask = val;
goto nextopt;
}
default:
fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n",
*cp);
break;
}
nextopt:
argc--, argv++;
}
(void) freopen(_PATH_DEVNULL, "w", stderr);
(void) signal(SIGPIPE, lostconn);
(void) signal(SIGCHLD, SIG_IGN);
if ((int)signal(SIGURG, myoob) < 0)
syslog(LOG_ERR, "signal: %m");
/* Try to handle urgent data inline */
#ifdef SO_OOBINLINE
if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR, "setsockopt: %m");
#endif
#ifdef F_SETOWN
if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
syslog(LOG_ERR, "fcntl F_SETOWN: %m");
#endif
dolog(&his_addr);
/*
* Set up default state
*/
data = -1;
type = TYPE_A;
form = FORM_N;
stru = STRU_F;
mode = MODE_S;
tmpline[0] = '\0';
(void) gethostname(hostname, sizeof (hostname));
access_init();
authenticate();
if (is_shutdown(1) != 0) {
syslog(LOG_INFO, "connection refused (server shut down) from %s [%s]",
remotehost, remoteaddr);
reply(500, "%s FTP server shut down -- please try again later.",
hostname);
exit(0);
}
show_banner(220);
reply(220, "%s FTP server (%s) ready.", hostname, version);
(void) setjmp(errcatch);
for (;;)
(void) yyparse();
/* NOTREACHED */
}
lostconn()
{
if (debug)
syslog(LOG_DEBUG, "lost connection to %s [%s]", remotehost, remoteaddr);
dologout(-1);
}
static char ttyline[20];
/*
* Helper function for sgetpwnam().
*/
char *
sgetsave(s)
char *s;
{
char *new = malloc((unsigned) strlen(s) + 1);
if (new == NULL) {
perror_reply(421, "Local resource failure: malloc");
dologout(1);
/* NOTREACHED */
}
(void) strcpy(new, s);
return (new);
}
/*
* Save the result of a getpwnam. Used for USER command, since
* the data returned must not be clobbered by any other command
* (e.g., globbing).
*/
struct passwd *
sgetpwnam(name)
char *name;
{
static struct passwd save;
register struct passwd *p;
char *sgetsave();
if ((p = getpwnam(name)) == NULL)
return (p);
if (save.pw_name) {
free(save.pw_name);
free(save.pw_passwd);
free(save.pw_gecos);
free(save.pw_dir);
free(save.pw_shell);
}
save = *p;
save.pw_name = sgetsave(p->pw_name);
save.pw_passwd = sgetsave(p->pw_passwd);
save.pw_gecos = sgetsave(p->pw_gecos);
save.pw_dir = sgetsave(p->pw_dir);
save.pw_shell = sgetsave(p->pw_shell);
return (&save);
}
int login_attempts; /* number of failed login attempts */
int askpasswd; /* had user command, ask for passwd */
/*
* USER command.
* Sets global passwd pointer pw if named account exists and is
* acceptable; sets askpasswd if a PASS command is expected. If logged in
* previously, need to reset state. If name is "ftp" or "anonymous", the
* name is not in _PATH_FTPUSERS, and ftp account exists, set anonymous
* and pw, then just return. If account doesn't exist, ask for passwd
* anyway. Otherwise, check user requesting login privileges. Disallow
* anyone who does not have a standard shell as returned by
* getusershell(). Disallow anyone mentioned in the file _PATH_FTPUSERS
* to allow people such as root and uucp to be avoided.
*/
user(name)
char *name;
{
register char *cp;
char *shell;
char *getusershell();
if (logged_in) {
if (anonymous || guest) {
reply(530, "Can't change user from guest login.");
return;
}
end_login();
}
if (!strcasecmp(name, "ftp") || !strcasecmp(name, "anonymous")) {
if (checkuser("ftp") || checkuser("anonymous")) {
reply(530, "User %s access denied.", name);
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED (ftp in /etc/ftpusers) FROM %s [%s], %s",
remotehost, remoteaddr, name);
} else if ((pw = sgetpwnam("ftp")) != NULL) {
anonymous = 1; /* for the access_ok call */
if (access_ok(530)) {
askpasswd = 1;
acl_setfunctions(anonymous);
reply(331, "Guest login ok, send e-mail address as password.");
} else {
reply(530, "User %s access denied.", name);
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED (access denied) FROM %s [%s], %s",
remotehost, remoteaddr, name);
anonymous = 0;
}
} else {
reply(530, "User %s unknown.", name);
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED (ftp not in /etc/passwd) FROM %s [%s], %s",
remotehost, remoteaddr, name);
}
return;
}
if ((pw = sgetpwnam(name)) != NULL) {
if ((shell = pw->pw_shell) == NULL || *shell == 0)
shell = _PATH_BSHELL;
while ((cp = getusershell()) != NULL)
if (strcmp(cp, shell) == 0)
break;
endusershell();
if (cp == NULL || checkuser(name)) {
reply(530, "User %s access denied.", name);
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED (bad shell) FROM %s [%s], %s",
remotehost, remoteaddr, name);
pw = (struct passwd *) NULL;
return;
}
}
/* if user is a member of any of the guestgroups, cause a chroot() */
guest = acl_guestgroup(pw);
if (!access_ok(530)) {
reply(530, "User %s access denied.", name);
syslog(LOG_NOTICE, "FTP LOGIN REFUSED (access denied) FROM %s [%s], %s",
remotehost, remoteaddr, name);
return;
} else acl_setfunctions(anonymous);
reply(331, "Password required for %s.", name);
askpasswd = 1;
/*
* Delay before reading passwd after first failed
* attempt to slow down passwd-guessing programs.
*/
if (login_attempts)
sleep((unsigned) login_attempts);
}
/*
* Check if a user is in the file _PATH_FTPUSERS
*/
checkuser(name)
char *name;
{
register FILE *fd;
register char *p;
char line[BUFSIZ];
if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) {
while (fgets(line, sizeof(line), fd) != NULL)
if ((p = strchr(line, '\n')) != NULL) {
*p = '\0';
if (line[0] == '#')
continue;
if (strcmp(line, name) == 0)
return (1);
}
(void) fclose(fd);
}
return (0);
}
/*
* Terminate login as previous user, if any, resetting state;
* used when USER command is given or login fails.
*/
end_login()
{
(void) seteuid((uid_t)0);
if (logged_in)
logwtmp(ttyline, "", "");
pw = NULL;
logged_in = 0;
anonymous = 0;
guest = 0;
}
pass(passwd)
char *passwd;
{
char *xpasswd, *salt;
if (logged_in || askpasswd == 0) {
reply(503, "Login with USER first.");
return;
}
askpasswd = 0;
/* Disable lreply() if the first character of the password is '-' since
* some hosts don't understand continuation messages and hang...
*/
if (*passwd == '-') dolreplies = 0; else dolreplies = 1;
if (!anonymous) { /* "ftp" is only account allowed no password */
if (*passwd == '-') passwd++;
*guestpw = NULL;
if (pw == NULL)
salt = "xx";
else
salt = pw->pw_passwd;
xpasswd = crypt(passwd, salt);
/* The strcmp does not catch null passwords! */
if (pw == NULL || *pw->pw_passwd == '\0' ||
strcmp(xpasswd, pw->pw_passwd)) {
reply(530, "Login incorrect.");
pw = NULL;
if (++login_attempts >= lgi_failure_threshold) {
syslog(LOG_NOTICE, "repeated login failures from %s [%s]",
remotehost, remoteaddr);
exit(0);
}
return;
}
} else {
char *pwin, *pwout = guestpw;
if (!*passwd) {
strcpy(guestpw, "[none_given]");
} else {
int cnt = sizeof(guestpw) - 2;
for (pwin = passwd; *pwin && cnt--; pwin++)
if (!isgraph(*pwin))
*pwout++ = '_';
else
*pwout++ = *pwin;
}
}
/* if autogroup command applies to user's class change pw->pw_gid */
if (anonymous)
(void) acl_autogroup(pw, anonymous);
login_attempts = 0; /* this time successful */
(void) setegid((gid_t)pw->pw_gid);
(void) initgroups(pw->pw_name, pw->pw_gid);
/* open wtmp before chroot */
(void) sprintf(ttyline, "ftp%d", getpid());
logwtmp(ttyline, pw->pw_name, remotehost);
logged_in = 1;
/* if logging is enabled, open logfile before chroot */
if (log_outbound_xfers || log_incoming_xfers)
xferlog = open(_PATH_XFERLOG, O_WRONLY|O_APPEND|O_CREAT, 0660);
if (anonymous || guest) {
/*
* We MUST do a chdir() after the chroot. Otherwise
* the old current directory will be accessible as "."
* outside the new root!
*/
if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
reply(550, "Can't set guest privileges.");
goto bad;
}
} else {
if (chdir(pw->pw_dir) < 0) {
if (chdir("/") < 0) {
reply(530, "User %s: can't change directory to %s.",
pw->pw_name, pw->pw_dir);
goto bad;
} else
lreply(230, "No directory! Logging in with home=/");
}
}
if (seteuid((uid_t)pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
if (anonymous) {
if (!strchr(passwd, '@')) {
lreply(230,
"Next time please use your e-mail address as your password");
lreply(230, " for example: %s@%s",
authenticated ? authuser : "joe", remotehost);
}
show_message(230, LOGIN);
show_readme(230, LOGIN);
(void) is_shutdown(0); /* display any shutdown messages now */
reply(230, "Guest login ok, access restrictions apply.");
#ifdef SETPROCTITLE
sprintf(proctitle, "%s: anonymous/%.*s", remotehost,
sizeof(proctitle) - sizeof(remotehost) -
sizeof(": anonymous/"), passwd);
setproctitle(proctitle);
#endif /* SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s [%s], %s",
remotehost, remoteaddr, passwd);
} else {
reply(230, "User %s logged in.%s", pw->pw_name, guest ?
" Access restrictions apply." : "");
#ifdef SETPROCTITLE
sprintf(proctitle, "%s: %s", remotehost, pw->pw_name);
setproctitle(proctitle);
#endif /* SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s [%s], %s",
remotehost, remoteaddr, pw->pw_name);
}
home = pw->pw_dir; /* home dir for globbing */
(void) umask(defumask);
return;
bad:
/* Forget all about it... */
xferlog = 0;
end_login();
}
char *
opt_string(options)
int options;
{
static char buf[100];
char *ptr = buf;
if ((options & O_COMPRESS) != NULL) *ptr++ = 'C';
if ((options & O_TAR) != NULL) *ptr++ = 'T';
if ((options & O_UNCOMPRESS) != NULL) *ptr++ = 'U';
if (options == 0) *ptr++ = '_';
*ptr++ = '\0';
return(buf);
}
retrieve(cmd, name)
char *cmd, *name;
{
FILE *fin, *dout;
struct stat st, junk;
int (*closefunc)() = NULL;
int options = 0;
time_t start_time = time(NULL);
static char *logname;
char namebuf[MAXPATHLEN];
#include "conversions.h"
if (!cmd && stat(name, &st)) {
char fnbuf[MAXPATHLEN], *ptr;
do {
if (!(mangleopts & O_COMPRESS) && (cvtptr->options & O_COMPRESS))
continue;
if (!(mangleopts & O_UNCOMPRESS)&&(cvtptr->options & O_UNCOMPRESS))
continue;
if (!(mangleopts & O_TAR) && (cvtptr->options & O_TAR))
continue;
if (cvtptr->postfix) {
int pfxlen = strlen(cvtptr->postfix);
int namelen = strlen(name);
if (namelen <= pfxlen) continue;
(void) strcpy(fnbuf, name);
if (strcmp(fnbuf + namelen - pfxlen, cvtptr->postfix)) continue;
*(fnbuf + namelen - pfxlen) = (char) NULL;
if (stat(fnbuf, &st)) continue;
}
if (cvtptr->stripfix) {
(void) strcpy(fnbuf, name);
(void) strcat(fnbuf, cvtptr->stripfix);
if (stat(fnbuf, &st)) continue;
}
if (S_ISDIR(st.st_mode)) {
if (!(cvtptr->types & T_DIR)) {
(void) reply(550, "Cannot %s directories.", cvtptr->name);
return;
}
if (cvtptr->options & O_TAR) {
strcpy(namebuf, fnbuf);
strcat(namebuf, "/.notar");
if (!stat(namebuf, &junk)) {
(void) reply(550,
"Sorry, you may not TAR that directory.");
return;
}
}
}
if (S_ISREG(st.st_mode) && !(cvtptr->types & T_REG)) {
(void) reply(550, "Cannot %s plain files.", cvtptr->name);
return;
}
if (!S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode)) {
(void) reply(550, "Cannot %s special files.", cvtptr->name);
return;
}
if (!(cvtptr->types & T_ASCII) && deny_badasciixfer(550,""))
return;
logname = fnbuf;
options |= cvtptr->options;
strcpy(namebuf, cvtptr->external_cmd);
if ((ptr = strchr(namebuf, ' ')) != NULL)
*ptr = '\0';
if (stat(namebuf, &st) != NULL) {
syslog(LOG_ERR, "external command %s not found",
namebuf);
(void) reply(550,
"Local error: conversion program not found. Cannot %s file.",
cvtptr->name);
return;
}
(void) retrieve(cvtptr->external_cmd, fnbuf);
goto dolog;
} while ((++cvtptr)->name);
} else logname = (char *) NULL;
if (cmd == 0) {
fin = fopen(name, "r"), closefunc = fclose;
st.st_size = 0;
} else {
char line[BUFSIZ];
(void) sprintf(line, cmd, name), name = line;
fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
st.st_size = -1;
st.st_blksize = BUFSIZ;
}
if (fin == NULL) {
if (errno != 0)
perror_reply(550, name);
return;
}
if (cmd == 0 &&
(fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) {
reply(550, "%s: not a plain file.", name);
goto done;
}
if (restart_point) {
if (type == TYPE_A) {
register int i, n, c;
n = restart_point;
i = 0;
while (i++ < n) {
if ((c=getc(fin)) == EOF) {
perror_reply(550, name);
goto done;
}
if (c == '\n')
i++;
}
} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
perror_reply(550, name);
goto done;
}
}
dout = dataconn(name, st.st_size, "w");
if (dout == NULL)
goto done;
send_data(fin, dout, st.st_blksize);
(void) fclose(dout);
dolog:
if (log_outbound_xfers && xferlog && (cmd == 0)) {
char msg[MAXPATHLEN];
int xfertime = time(NULL) - start_time;
int curtime = time(NULL);
int loop;
if (!xfertime) xfertime++;
realpath(logname ? logname : name, namebuf);
for (loop = 0; namebuf[loop]; loop++)
if (isspace(namebuf[loop]) || iscntrl(namebuf[loop]))
namebuf[loop] = '_';
sprintf(msg, "%.24s %d %s %d %s %c %s %c %c %s ftp %d %s\n",
ctime(&start_time),
xfertime,
remotehost,
byte_count,
namebuf,
(type == TYPE_A) ? 'a' : 'b',
opt_string(options),
'o',
anonymous ? 'a' : 'r',
anonymous ? guestpw : pw->pw_name,
authenticated,
authenticated ? authuser : "*"
);
write(xferlog, msg, strlen(msg));
}
data = -1;
pdata = -1;
done:
if (closefunc) (*closefunc)(fin);
}
store(name, mode, unique)
char *name, *mode;
int unique;
{
FILE *fout, *din;
struct stat st;
int (*closefunc)();
char *gunique();
time_t start_time = time(NULL);
if (unique && stat(name, &st) == 0 &&
(name = gunique(name)) == NULL)
return;
if (restart_point)
mode = "r+w";
fout = fopen(name, mode);
closefunc = fclose;
if (fout == NULL) {
perror_reply(553, name);
return;
}
if (restart_point) {
if (type == TYPE_A) {
register int i, n, c;
n = restart_point;
i = 0;
while (i++ < n) {
if ((c=getc(fout)) == EOF) {
perror_reply(550, name);
goto done;
}
if (c == '\n')
i++;
}
/*
* We must do this seek to "current" position
* because we are changing from reading to
* writing.
*/
if (fseek(fout, 0L, L_INCR) < 0) {
perror_reply(550, name);
goto done;
}
} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
perror_reply(550, name);
goto done;
}
}
din = dataconn(name, (off_t)-1, "r");
if (din == NULL)
goto done;
if (receive_data(din, fout) == 0) {
if (unique)
reply(226, "Transfer complete (unique file name:%s).",
name);
else
reply(226, "Transfer complete.");
}
(void) fclose(din);
dolog:
if (log_incoming_xfers && xferlog) {
char namebuf[MAXPATHLEN],
msg[MAXPATHLEN];
int xfertime = time(NULL) - start_time;
int loop;
if (!xfertime) xfertime++;
realpath(name, namebuf);
for (loop = 0; namebuf[loop]; loop++)
if (isspace(namebuf[loop]) || iscntrl(namebuf[loop]))
namebuf[loop] = '_';
sprintf(msg, "%.24s %d %s %d %s %c %s %c %c %s ftp %d %s\n",
ctime(&start_time),
xfertime,
remotehost,
byte_count,
namebuf,
(type == TYPE_A) ? 'a' : 'b',
opt_string(0),
'i',
anonymous ? 'a' : 'r',
anonymous ? guestpw : pw->pw_name,
authenticated,
authenticated ? authuser : "*"
);
write(xferlog, msg, strlen(msg));
}
data = -1;
pdata = -1;
done:
(*closefunc)(fout);
}
FILE *
getdatasock(mode)
char *mode;
{
int s, on = 1, tries;
if (data >= 0)
return (fdopen(data, mode));
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return (NULL);
(void) seteuid((uid_t)0);
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(char *) &on, sizeof (on)) < 0)
goto bad;
/* anchor socket to avoid multi-homing problems */
data_source.sin_family = AF_INET;
data_source.sin_addr = ctrl_addr.sin_addr;
for (tries = 1; ; tries++) {
if (bind(s, (struct sockaddr *)&data_source,
sizeof (data_source)) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep(tries);
}
(void) seteuid((uid_t)pw->pw_uid);
#ifdef IP_TOS
on = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif
return (fdopen(s, mode));
bad:
(void) seteuid((uid_t)pw->pw_uid);
(void) close(s);
return (NULL);
}
FILE *
dataconn(name, size, mode)
char *name;
off_t size;
char *mode;
{
char sizebuf[32];
FILE *file;
int retry = 0, tos;
file_size = size;
byte_count = 0;
if (size != (off_t) -1)
(void) sprintf (sizebuf, " (%ld bytes)", size);
else
(void) strcpy(sizebuf, "");
if (pdata >= 0) {
struct sockaddr_in from;
int s, fromlen = sizeof(from);
s = accept(pdata, (struct sockaddr *)&from, &fromlen);
if (s < 0) {
reply(425, "Can't open data connection.");
(void) close(pdata);
pdata = -1;
return(NULL);
}
(void) close(pdata);
pdata = s;
#ifdef IP_TOS
tos = IPTOS_LOWDELAY;
(void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos,
sizeof(int));
#endif
reply(150, "Opening %s mode data connection for %s%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return(fdopen(pdata, mode));
}
if (data >= 0) {
reply(125, "Using existing data connection for %s%s.",
name, sizebuf);
usedefault = 1;
return (fdopen(data, mode));
}
if (usedefault)
data_dest = his_addr;
usedefault = 1;
file = getdatasock(mode);
if (file == NULL) {
reply(425, "Can't create data socket (%s,%d): %s.",
inet_ntoa(data_source.sin_addr),
ntohs(data_source.sin_port), strerror(errno));
return (NULL);
}
data = fileno(file);
while (connect(data, (struct sockaddr *)&data_dest,
sizeof (data_dest)) < 0) {
if (errno == EADDRINUSE && retry < swaitmax) {
sleep((unsigned) swaitint);
retry += swaitint;
continue;
}
perror_reply(425, "Can't build data connection");
(void) fclose(file);
data = -1;
return (NULL);
}
reply(150, "Opening %s mode data connection for %s%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (file);
}
/*
* Tranfer the contents of "instr" to
* "outstr" peer using the appropriate
* encapsulation of the data subject
* to Mode, Structure, and Type.
*
* NB: Form isn't handled.
*/
send_data(instr, outstr, blksize)
FILE *instr, *outstr;
off_t blksize;
{
register int c, cnt, outcnt;
register char *buf;
int netfd, filefd;
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return;
}
switch (type) {
case TYPE_A:
while ((c = getc(instr)) != EOF) {
byte_count++;
if (c == '\n') {
if (ferror(outstr))
goto data_err;
(void) putc('\r', outstr);
}
(void) putc(c, outstr);
}
fflush(outstr);
transflag = 0;
if (ferror(instr))
goto file_err;
if (ferror(outstr))
goto data_err;
reply(226, "Transfer complete.");
return;
case TYPE_I:
case TYPE_L:
if ((buf = malloc((u_int)blksize)) == NULL) {
transflag = 0;
perror_reply(451, "Local resource failure: malloc");
return;
}
netfd = fileno(outstr);
filefd = fileno(instr);
while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
write(netfd, buf, cnt) == cnt)
byte_count += cnt;
transflag = 0;
(void)free(buf);
if (cnt != 0) {
if (cnt < 0)
goto file_err;
goto data_err;
}
reply(226, "Transfer complete.");
return;
default:
transflag = 0;
reply(550, "Unimplemented TYPE %d in send_data", type);
return;
}
data_err:
transflag = 0;
perror_reply(426, "Data connection");
return;
file_err:
transflag = 0;
perror_reply(551, "Error on input file");
}
/*
* Transfer data from peer to
* "outstr" using the appropriate
* encapulation of the data subject
* to Mode, Structure, and Type.
*
* N.B.: Form isn't handled.
*/
receive_data(instr, outstr)
FILE *instr, *outstr;
{
register int c;
int cnt, bare_lfs = 0;
char buf[BUFSIZ];
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return (-1);
}
switch (type) {
case TYPE_I:
case TYPE_L:
while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) {
if (write(fileno(outstr), buf, cnt) != cnt)
goto file_err;
byte_count += cnt;
}
if (cnt < 0)
goto data_err;
transflag = 0;
return (0);
case TYPE_E:
reply(553, "TYPE E not implemented.");
transflag = 0;
return (-1);
case TYPE_A:
while ((c = getc(instr)) != EOF) {
byte_count++;
if (c == '\n')
bare_lfs++;
while (c == '\r') {
if (ferror(outstr))
goto data_err;
if ((c = getc(instr)) != '\n') {
(void) putc ('\r', outstr);
if (c == '\0' || c == EOF)
goto contin2;
}
}
(void) putc(c, outstr);
contin2: ;
}
fflush(outstr);
if (ferror(instr))
goto data_err;
if (ferror(outstr))
goto file_err;
transflag = 0;
if (bare_lfs) {
lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs);
printf(" File may not have transferred correctly.\r\n");
}
return (0);
default:
reply(550, "Unimplemented TYPE %d in receive_data", type);
transflag = 0;
return (-1);
}
data_err:
transflag = 0;
perror_reply(426, "Data Connection");
return (-1);
file_err:
transflag = 0;
perror_reply(452, "Error writing file");
return (-1);
}
statfilecmd(filename)
char *filename;
{
char line[BUFSIZ];
FILE *fin;
int c;
(void) sprintf(line, "/bin/ls -lgA %s", filename);
fin = ftpd_popen(line, "r");
lreply(211, "status of %s:", filename);
while ((c = getc(fin)) != EOF) {
if (c == '\n') {
if (ferror(stdout)){
perror_reply(421, "control connection");
(void) ftpd_pclose(fin);
dologout(1);
/* NOTREACHED */
}
if (ferror(fin)) {
perror_reply(551, filename);
(void) ftpd_pclose(fin);
return;
}
(void) putc('\r', stdout);
}
(void) putc(c, stdout);
}
(void) ftpd_pclose(fin);
reply(211, "End of Status");
}
statcmd()
{
struct sockaddr_in *sin;
u_char *a, *p;
lreply(211, "%s FTP server status:", hostname, version);
printf(" %s\r\n", version);
printf(" Connected to %s", remotehost);
if (!isdigit(remotehost[0]))
printf(" (%s)", inet_ntoa(his_addr.sin_addr));
printf("\r\n");
if (logged_in) {
if (anonymous)
printf(" Logged in anonymously\r\n");
else
printf(" Logged in as %s\r\n", pw->pw_name);
} else if (askpasswd)
printf(" Waiting for password\r\n");
else
printf(" Waiting for user name\r\n");
printf(" TYPE: %s", typenames[type]);
if (type == TYPE_A || type == TYPE_E)
printf(", FORM: %s", formnames[form]);
if (type == TYPE_L)
#if NBBY == 8
printf(" %d", NBBY);
#else
printf(" %d", bytesize); /* need definition! */
#endif
printf("; STRUcture: %s; transfer MODE: %s\r\n",
strunames[stru], modenames[mode]);
if (data != -1)
printf(" Data connection open\r\n");
else if (pdata != -1) {
printf(" in Passive mode");
sin = &pasv_addr;
goto printaddr;
} else if (usedefault == 0) {
printf(" PORT");
sin = &data_dest;
printaddr:
a = (u_char *) &sin->sin_addr;
p = (u_char *) &sin->sin_port;
#define UC(b) (((int) b) & 0xff)
printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
#undef UC
} else
printf(" No data connection\r\n");
reply(211, "End of status");
}
fatal(s)
char *s;
{
reply(451, "Error in server: %s\n", s);
reply(221, "Closing connection due to server error.");
dologout(0);
/* NOTREACHED */
}
/* VARARGS2 */
reply(n, fmt, p0, p1, p2, p3, p4, p5)
int n;
char *fmt;
{
if (autospout != NULL) {
char *ptr = autospout;
printf("%d-", n);
while (*ptr) {
if (*ptr == '\n') {
printf("\r\n");
if (*(++ptr))
printf("%d-", n);
} else {
putchar(*ptr++);
}
}
if (*(--ptr) != '\n')
printf("\r\n");
if (autospout_free) {
(void) free(autospout);
autospout_free = 0;
}
autospout = 0;
}
printf("%d ", n);
printf(fmt, p0, p1, p2, p3, p4, p5);
printf("\r\n");
(void)fflush(stdout);
if (debug) {
syslog(LOG_DEBUG, "<--- %d ", n);
syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5);
}
}
/* VARARGS2 */
lreply(n, fmt, p0, p1, p2, p3, p4, p5)
int n;
char *fmt;
{
if (!dolreplies) return;
printf("%d-", n);
printf(fmt, p0, p1, p2, p3, p4, p5);
printf("\r\n");
(void)fflush(stdout);
if (debug) {
syslog(LOG_DEBUG, "<--- %d- ", n);
syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5);
}
}
ack(s)
char *s;
{
reply(250, "%s command successful.", s);
}
nack(s)
char *s;
{
reply(502, "%s command not implemented.", s);
}
/* ARGSUSED */
yyerror(s)
char *s;
{
char *cp;
if ((cp = strchr(cbuf,'\n')) != NULL)
*cp = '\0';
reply(500, "'%s': command not understood.", cbuf);
}
delete(name)
char *name;
{
struct stat st;
if (stat(name, &st) < 0) {
perror_reply(550, name);
return;
}
if ((st.st_mode&S_IFMT) == S_IFDIR) {
if (rmdir(name) < 0) {
perror_reply(550, name);
return;
}
goto done;
}
if (unlink(name) < 0) {
perror_reply(550, name);
return;
}
done:
ack("DELE");
}
cwd(path)
char *path;
{
if (chdir(path) < 0)
perror_reply(550, path);
else {
show_message(250, CWD);
show_readme(250, CWD);
ack("CWD");
}
}
makedir(name)
char *name;
{
if (mkdir(name, 0777) < 0)
perror_reply(550, name);
else
reply(257, "MKD command successful.");
}
removedir(name)
char *name;
{
if (rmdir(name) < 0)
perror_reply(550, name);
else
ack("RMD");
}
pwd()
{
char path[MAXPATHLEN + 1];
extern char *getwd();
if (getwd(path) == (char *)NULL)
reply(550, "%s.", path);
else
reply(257, "\"%s\" is current directory.", path);
}
char *
renamefrom(name)
char *name;
{
struct stat st;
if (stat(name, &st) < 0) {
perror_reply(550, name);
return ((char *)0);
}
reply(350, "File exists, ready for destination name");
return (name);
}
renamecmd(from, to)
char *from, *to;
{
if (rename(from, to) < 0)
perror_reply(550, "rename");
else
ack("RNTO");
}
dolog(sin)
struct sockaddr_in *sin;
{
struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof (struct in_addr), AF_INET);
(void) strncpy(remoteaddr, inet_ntoa(sin->sin_addr), sizeof (remoteaddr));
if (hp) {
nameserved = 1;
(void) strncpy(remotehost, hp->h_name, sizeof (remotehost));
} else {
nameserved = 0;
(void) strncpy(remotehost, remoteaddr, sizeof (remotehost));
}
#ifdef SETPROCTITLE
sprintf(proctitle, "%s: connected", remotehost);
setproctitle(proctitle);
#endif /* SETPROCTITLE */
if (logging) syslog(LOG_INFO, "connection from %s [%s]", remotehost,
remoteaddr);
}
/*
* Record logout in wtmp file
* and exit with supplied status.
*/
dologout(status)
int status;
{
if (logged_in) {
(void) seteuid((uid_t)0);
logwtmp(ttyline, "", "");
}
if (xferlog) close(xferlog);
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
myoob()
{
char *cp;
/* only process if transfer occurring */
if (!transflag)
return;
cp = tmpline;
if (getline(cp, 7, stdin) == NULL) {
reply(221, "You could at least say goodbye.");
dologout(0);
}
upper(cp);
if (strcmp(cp, "ABOR\r\n") == 0) {
tmpline[0] = '\0';
reply(426, "Transfer aborted. Data connection closed.");
reply(226, "Abort successful");
longjmp(urgcatch, 1);
}
if (strcmp(cp, "STAT\r\n") == 0) {
if (file_size != (off_t) -1)
reply(213, "Status: %lu of %lu bytes transferred",
byte_count, file_size);
else
reply(213, "Status: %lu bytes transferred", byte_count);
}
}
/*
* Note: a response of 425 is not mentioned as a possible response to
* the PASV command in RFC959. However, it has been blessed as
* a legitimate response by Jon Postel in a telephone conversation
* with Rick Adams on 25 Jan 89.
*/
passive()
{
int len;
register char *p, *a;
pdata = socket(AF_INET, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
pasv_addr = ctrl_addr;
pasv_addr.sin_port = 0;
(void) seteuid((uid_t)0);
if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
(void) seteuid((uid_t)pw->pw_uid);
goto pasv_error;
}
(void) seteuid((uid_t)pw->pw_uid);
len = sizeof(pasv_addr);
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
goto pasv_error;
if (listen(pdata, 1) < 0)
goto pasv_error;
a = (char *) &pasv_addr.sin_addr;
p = (char *) &pasv_addr.sin_port;
#define UC(b) (((int) b) & 0xff)
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
return;
pasv_error:
(void) close(pdata);
pdata = -1;
perror_reply(425, "Can't open passive connection");
return;
}
/*
* Generate unique name for file with basename "local".
* The file named "local" is already known to exist.
* Generates failure reply on error.
*/
char *
gunique(local)
char *local;
{
static char new[MAXPATHLEN];
struct stat st;
char *cp = strrchr(local, '/');
int count = 0;
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) < 0) {
perror_reply(553, cp ? local : ".");
return((char *) 0);
}
if (cp)
*cp = '/';
(void) strcpy(new, local);
cp = new + strlen(new);
*cp++ = '.';
for (count = 1; count < 100; count++) {
(void) sprintf(cp, "%d", count);
if (stat(new, &st) < 0)
return(new);
}
reply(452, "Unique file name cannot be created.");
return((char *) 0);
}
/*
* Format and send reply containing system error number.
*/
perror_reply(code, string)
int code;
char *string;
{
reply(code, "%s: %s.", string, strerror(errno));
}
static char *onefile[] = {
"",
0
};
send_file_list(whichfiles)
char *whichfiles;
{
struct stat st;
DIR *dirp = NULL;
struct direct *dir;
FILE *dout = NULL;
register char **dirlist, *dirname;
int simple = 0;
char *strpbrk();
if (strpbrk(whichfiles, "~{[*?") != NULL) {
extern char **glob(), *globerr;
globerr = NULL;
dirlist = glob(whichfiles);
if (globerr != NULL) {
reply(550, globerr);
return;
} else if (dirlist == NULL) {
errno = ENOENT;
perror_reply(550, whichfiles);
return;
}
} else {
onefile[0] = whichfiles;
dirlist = onefile;
simple = 1;
}
if (setjmp(urgcatch)) {
transflag = 0;
return;
}
while ((dirname = *dirlist++) != NULL) {
if (stat(dirname, &st) < 0) {
/*
* If user typed "ls -l", etc, and the client
* used NLST, do what the user meant.
*/
if (dirname[0] == '-' && *dirlist == NULL && transflag == 0) {
retrieve("/bin/ls %s", dirname);
return;
}
perror_reply(550, whichfiles);
if (dout != NULL) {
(void) fclose(dout);
transflag = 0;
data = -1;
pdata = -1;
}
return;
}
if ((st.st_mode&S_IFMT) == S_IFREG) {
if (dout == NULL) {
dout = dataconn("file list", (off_t)-1, "w");
if (dout == NULL)
return;
transflag++;
}
fprintf(dout, "%s%s\n", dirname,
type == TYPE_A ? "\r" : "");
byte_count += strlen(dirname) + 1;
continue;
} else if ((st.st_mode&S_IFMT) != S_IFDIR)
continue;
if ((dirp = opendir(dirname)) == NULL)
continue;
while ((dir = readdir(dirp)) != NULL) {
char nbuf[MAXPATHLEN];
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
continue;
if (dir->d_namlen == 2 && dir->d_name[0] == '.' &&
dir->d_name[1] == '.')
continue;
sprintf(nbuf, "%s/%s", dirname, dir->d_name);
/*
* We have to do a stat to insure it's
* not a directory or special file.
*/
if (simple || (stat(nbuf, &st) == 0 &&
(st.st_mode&S_IFMT) == S_IFREG)) {
if (dout == NULL) {
dout = dataconn("file list", (off_t)-1,
"w");
if (dout == NULL)
return;
transflag++;
}
if (nbuf[0] == '.' && nbuf[1] == '/')
fprintf(dout, "%s%s\n", &nbuf[2],
type == TYPE_A ? "\r" : "");
else
fprintf(dout, "%s%s\n", nbuf,
type == TYPE_A ? "\r" : "");
byte_count += strlen(nbuf) + 1;
}
}
(void) closedir(dirp);
}
if (dout == NULL)
reply(550, "No files found.");
else if (ferror(dout) != 0)
perror_reply(550, "Data connection");
else
reply(226, "Transfer complete.");
transflag = 0;
if (dout != NULL)
(void) fclose(dout);
data = -1;
pdata = -1;
}
#ifdef SETPROCTITLE
/*
* clobber argv so ps will show what we're doing.
* (stolen from sendmail)
* warning, since this is usually started from inetd.conf, it
* often doesn't have much of an environment or arglist to overwrite.
*/
/*VARARGS1*/
setproctitle(fmt, a, b, c)
char *fmt;
{
register char *p, *bp, ch;
register int i;
char buf[BUFSIZ];
(void) sprintf(buf, fmt, a, b, c);
/* make ps print our process name */
p = Argv[0];
*p++ = '-';
i = strlen(buf);
if (i > LastArgv - p - 2) {
i = LastArgv - p - 2;
buf[i] = '\0';
}
bp = buf;
while ((ch = *bp++) != (char) NULL)
if (ch != '\n' && ch != '\r')
*p++ = ch;
while (p < LastArgv)
*p++ = ' ';
}
#endif /* SETPROCTITLE */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.