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NetBSD/libexec/ftpd/ftpd.c

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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, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
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[] = "from: @(#)ftpd.c 5.40 (Berkeley) 7/2/91";*/
static char rcsid[] = "$Id: ftpd.c,v 1.4 1994/03/30 02:50:29 cgd Exp $";
#endif /* not lint */
/*
* FTP server.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.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 <signal.h>
#include <dirent.h>
#include <fcntl.h>
#include <time.h>
#include <pwd.h>
#include <setjmp.h>
#include <netdb.h>
#include <errno.h>
#include <syslog.h>
#include <varargs.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "pathnames.h"
/*
* File containing login names
* NOT to be used on this machine.
* Commonly used to disallow uucp.
*/
extern int errno;
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();
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 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];
#if defined(KERBEROS)
int notickets = 1;
char *krbtkfile_env = NULL;
#endif
/*
* 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 */
int swaitmax = SWAITMAX;
int swaitint = SWAITINT;
void lostconn(), 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;
/*
* LOG_NDELAY sets up the logging connection immediately,
* necessary for anonymous ftp's that chroot and can't do it later.
*/
openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
addrlen = sizeof (his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
exit(1);
}
addrlen = sizeof (ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
exit(1);
}
#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 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 'v':
debug = 1;
break;
case 'd':
debug = 1;
break;
case 'l':
logging = 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));
reply(220, "%s FTP server (%s) ready.", hostname, version);
(void) setjmp(errcatch);
for (;;)
(void) yyparse();
/* NOTREACHED */
}
void
lostconn()
{
if (debug)
syslog(LOG_DEBUG, "lost connection");
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 guest 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 (guest) {
reply(530, "Can't change user from guest login.");
return;
}
end_login();
}
guest = 0;
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
if (checkuser("ftp") || checkuser("anonymous"))
reply(530, "User %s access denied.", name);
else if ((pw = sgetpwnam("ftp")) != NULL) {
guest = 1;
askpasswd = 1;
reply(331, "Guest login ok, send ident as password.");
} else
reply(530, "User %s unknown.", name);
return;
}
if (pw = sgetpwnam(name)) {
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 FROM %s, %s",
remotehost, name);
pw = (struct passwd *) NULL;
return;
}
}
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 = index(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;
guest = 0;
}
pass(passwd)
char *passwd;
{
int rval;
if (logged_in || askpasswd == 0) {
reply(503, "Login with USER first.");
return;
}
askpasswd = 0;
if (!guest) { /* "ftp" is only account allowed no password */
if (pw == NULL)
rval = 1; /* failure below */
else
#if defined(KERBEROS)
rval = klogin(pw, "", hostname, passwd);
if (rval == 1)
#endif
/* the strcmp does not catch null passwords! */
if (pw == NULL || *pw->pw_passwd == '\0')
rval = 1; /* failure */
else
rval = strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")),
pw->pw_passwd);
/*
* If rval == 1, the user failed the authentication check
* above. If rval == 0, either Kerberos or local authentication
* succeeded.
*/
if (rval) {
reply(530, "Login incorrect.");
pw = NULL;
if (login_attempts++ >= 5) {
syslog(LOG_NOTICE,
"repeated login failures from %s",
remotehost);
exit(0);
}
return;
}
}
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 (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 (guest) {
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",
remotehost, passwd);
} else {
reply(230, "User %s logged in.", pw->pw_name);
#ifdef SETPROCTITLE
sprintf(proctitle, "%s: %s", remotehost, pw->pw_name);
setproctitle(proctitle);
#endif /* SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s, %s",
remotehost, pw->pw_name);
}
home = pw->pw_dir; /* home dir for globbing */
(void) umask(defumask);
return;
bad:
/* Forget all about it... */
end_login();
}
retrieve(cmd, name)
char *cmd, *name;
{
FILE *fin, *dout;
struct stat st;
int (*closefunc)();
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);
data = -1;
pdata = -1;
done:
(*closefunc)(fin);
}
store(name, mode, unique)
char *name, *mode;
int unique;
{
FILE *fout, *din;
struct stat st;
int (*closefunc)();
char *gunique();
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);
data = -1;
pdata = -1;
done:
(*closefunc)(fout);
}
FILE *
getdatasock(mode)
char *mode;
{
int s, on = 1, tries;
if (data >= 0)
return (fdopen(data, mode));
(void) seteuid((uid_t)0);
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
goto bad;
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;
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 (guest)
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;
{
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;
{
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 = index(cbuf,'\n'))
*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
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);
time_t t, time();
extern char *ctime();
if (hp)
(void) strncpy(remotehost, hp->h_name, sizeof (remotehost));
else
(void) strncpy(remotehost, inet_ntoa(sin->sin_addr),
sizeof (remotehost));
#ifdef SETPROCTITLE
sprintf(proctitle, "%s: connected", remotehost);
setproctitle(proctitle);
#endif /* SETPROCTITLE */
if (logging) {
t = time((time_t *) 0);
syslog(LOG_INFO, "connection from %s at %s",
remotehost, ctime(&t));
}
}
/*
* 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 defined(KERBEROS)
if (!notickets && krbtkfile_env)
unlink(krbtkfile_env);
#endif
}
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
void
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 = rindex(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 dirent *dir;
FILE *dout = NULL;
register char **dirlist, *dirname;
int simple = 0;
char *strpbrk();
if (strpbrk(whichfiles, "~{[*?") != NULL) {
extern char **ftpglob(), *globerr;
globerr = NULL;
dirlist = ftpglob(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++) {
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_name[0] == '.' && dir->d_name[1] == '.' &&
dir->d_namlen == 2)
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++)
if (ch != '\n' && ch != '\r')
*p++ = ch;
while (p < LastArgv)
*p++ = ' ';
}
#endif /* SETPROCTITLE */
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