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src/libexec/ftpd/ftpd.c

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/* $OpenBSD: ftpd.c,v 1.234 2024/05/09 08:35:03 florian Exp $ */
/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */
/*
* Copyright (C) 1997 and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* FTP server.
*/
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#define FTP_NAMES
#include <arpa/ftp.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>
#include <bsd_auth.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <limits.h>
#include <login_cap.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <vis.h>
#include <unistd.h>
#include <utmp.h>
#include <poll.h>
#include "pathnames.h"
#include "monitor.h"
#include "extern.h"
extern off_t restart_point;
extern char cbuf[];
union sockunion ctrl_addr;
union sockunion data_source;
union sockunion data_dest;
union sockunion his_addr;
union sockunion pasv_addr;
sigset_t allsigs;
int daemon_mode = 0;
int data;
int logged_in;
struct passwd *pw;
int debug = 0;
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 anon_ok = 1;
int anon_only = 0;
unsigned int minuid = 1000;
int multihome = 0;
int guest;
int stats;
int statfd = -1;
int portcheck = 1;
int dochroot;
int type;
int form;
int stru; /* avoid C keyword */
int mode;
int doutmp = 0; /* update utmp file */
int nowtmp = 0; /* do not update wtmp file */
int usedefault = 1; /* for data transfers */
int pdata = -1; /* for passive mode */
int family = AF_UNSPEC;
volatile sig_atomic_t transflag;
off_t file_size;
off_t byte_count;
mode_t defumask = S_IWGRP|S_IWOTH; /* default umask value */
int umaskchange = 1; /* allow user to change umask value. */
char tmpline[7];
char hostname[HOST_NAME_MAX+1];
char remotehost[HOST_NAME_MAX+1];
char dhostname[HOST_NAME_MAX+1];
char *guestpw;
char ttyline[20];
static struct utmp utmp; /* for utmp */
static login_cap_t *lc;
static auth_session_t *as;
static volatile sig_atomic_t recvurg;
int epsvall = 0;
/*
* 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;
char proctitle[BUFSIZ]; /* initial part of title */
#define LOGCMD(cmd, file) \
if (logging > 1) \
syslog(LOG_INFO,"%s %s%s", cmd, \
*(file) == '/' ? "" : curdir(), file);
#define LOGCMD2(cmd, file1, file2) \
if (logging > 1) \
syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
*(file1) == '/' ? "" : curdir(), file1, \
*(file2) == '/' ? "" : curdir(), file2);
#define LOGBYTES(cmd, file, cnt) \
if (logging > 1) { \
if ((cnt) == -1) \
syslog(LOG_INFO,"%s %s%s", cmd, \
*(file) == '/' ? "" : curdir(), file); \
else \
syslog(LOG_INFO, "%s %s%s = %lld bytes", \
cmd, (*(file) == '/') ? "" : curdir(), file, \
(long long)(cnt)); \
}
static void ack(const char *);
static void sigurg(int);
static void myoob(void);
static int checkuser(char *, const char *);
static FILE *dataconn(const char *, off_t, char *);
static void dolog(struct sockaddr *);
static char *copy_dir(char *, struct passwd *);
static char *curdir(void);
static void end_login(void);
static FILE *getdatasock(char *);
static int guniquefd(const char *, char **);
static void lostconn(int);
static void sigquit(int);
static int receive_data(FILE *, FILE *);
static void replydirname(const char *, const char *);
static int send_data(FILE *, FILE *, off_t, off_t, int);
static struct passwd *
sgetpwnam(const char *, struct passwd *);
static void reapchild(int);
static void usage(void);
void logxfer(const char *, off_t, time_t);
void set_slave_signals(void);
static char *
curdir(void)
{
static char path[PATH_MAX+1]; /* path + '/' */
if (getcwd(path, sizeof(path)-1) == NULL)
return ("");
if (path[1] != '\0') /* special case for root dir. */
strlcat(path, "/", sizeof path);
/* For guest account, skip / since it's chrooted */
return (guest ? path+1 : path);
}
char *argstr = "AdDhnlm:MSt:T:u:PUvW46";
static void
usage(void)
{
syslog(LOG_ERR,
"usage: ftpd [-46ADdlMnPSUW] [-m minuid] [-T maxtimeout] "
"[-t timeout] [-u mask]");
exit(2);
}
int
main(int argc, char *argv[])
{
socklen_t addrlen;
int ch, on = 1, tos;
char line[LINE_MAX];
FILE *fp;
struct hostent *hp;
struct sigaction sa;
int error = 0;
const char *errstr;
tzset(); /* in case no timezone database in ~ftp */
sigfillset(&allsigs); /* used to block signals while root */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
while ((ch = getopt(argc, argv, argstr)) != -1) {
switch (ch) {
case 'A':
anon_only = 1;
break;
case 'd':
case 'v': /* deprecated */
debug = 1;
break;
case 'D':
daemon_mode = 1;
break;
case 'P':
portcheck = 0;
break;
case 'h': /* deprecated */
break;
case 'l':
logging++; /* > 1 == extra logging */
break;
case 'm':
minuid = strtonum(optarg, 0, UINT_MAX, &errstr);
if (errstr) {
syslog(LOG_ERR,
"%s is a bad value for -m, aborting",
optarg);
exit(2);
}
break;
case 'M':
multihome = 1;
break;
case 'n':
anon_ok = 0;
break;
case 'S':
stats = 1;
break;
case 't':
timeout = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr) {
syslog(LOG_ERR,
"%s is a bad value for -t, aborting",
optarg);
exit(2);
}
if (maxtimeout < timeout)
maxtimeout = timeout;
break;
case 'T':
maxtimeout = strtonum(optarg, 0, INT_MAX,
&errstr);
if (errstr) {
syslog(LOG_ERR,
"%s is a bad value for -T, aborting",
optarg);
exit(2);
}
if (timeout > maxtimeout)
timeout = maxtimeout;
break;
case 'u':
{
long val = 0;
char *p;
umaskchange = 0;
val = strtol(optarg, &p, 8);
if (*optarg == '\0' || *p != '\0' || val < 0 ||
(val & ~ACCESSPERMS)) {
syslog(LOG_ERR,
"%s is a bad value for -u, aborting",
optarg);
exit(2);
}
defumask = val;
break;
}
case 'U':
doutmp = 1;
break;
case 'W':
nowtmp = 1;
break;
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
default:
usage();
break;
}
}
if (nowtmp && doutmp) {
syslog(LOG_ERR, "options 'U' and 'W' are mutually exclusive");
exit(1);
}
(void) freopen(_PATH_DEVNULL, "w", stderr);
/*
* 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_FTP);
if (getpwnam(FTPD_PRIVSEP_USER) == NULL) {
syslog(LOG_ERR, "privilege separation user %s not found",
FTPD_PRIVSEP_USER);
exit(1);
}
endpwent();
if (daemon_mode) {
int *fds, fd;
struct pollfd *pfds;
struct addrinfo hints, *res, *res0;
nfds_t n, i;
/*
* Detach from parent.
*/
if (daemon(1, 1) == -1) {
syslog(LOG_ERR, "failed to become a daemon");
exit(1);
}
sa.sa_handler = reapchild;
(void) sigaction(SIGCHLD, &sa, NULL);
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(NULL, "ftp", &hints, &res0);
if (error) {
syslog(LOG_ERR, "%s", gai_strerror(error));
exit(1);
}
n = 0;
for (res = res0; res; res = res->ai_next)
n++;
fds = calloc(n, sizeof(int));
pfds = calloc(n, sizeof(struct pollfd));
if (!fds || !pfds) {
syslog(LOG_ERR, "%s", strerror(errno));
exit(1);
}
/*
* Open sockets, bind it to the FTP port, and start
* listening.
*/
n = 0;
for (res = res0; res; res = res->ai_next) {
fds[n] = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (fds[n] == -1)
continue;
if (setsockopt(fds[n], SOL_SOCKET, SO_KEEPALIVE,
&on, sizeof(on)) == -1) {
close(fds[n]);
fds[n] = -1;
continue;
}
if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on)) == -1) {
close(fds[n]);
fds[n] = -1;
continue;
}
if (bind(fds[n], res->ai_addr, res->ai_addrlen) == -1) {
close(fds[n]);
fds[n] = -1;
continue;
}
if (listen(fds[n], 32) == -1) {
close(fds[n]);
fds[n] = -1;
continue;
}
pfds[n].fd = fds[n];
pfds[n].events = POLLIN;
n++;
}
freeaddrinfo(res0);
if (n == 0) {
syslog(LOG_ERR, "could not open control socket");
exit(1);
}
/*
* Loop forever accepting connection requests and forking off
* children to handle them.
*/
while (1) {
if (poll(pfds, n, INFTIM) == -1) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "poll: %m");
exit(1);
}
for (i = 0; i < n; i++)
if (pfds[i].revents & POLLIN) {
addrlen = sizeof(his_addr);
fd = accept(pfds[i].fd,
(struct sockaddr *)&his_addr,
&addrlen);
if (fd != -1) {
if (fork() == 0)
goto child;
close(fd);
}
}
}
child:
/* child */
(void)dup2(fd, STDIN_FILENO);
(void)dup2(fd, STDOUT_FILENO);
for (i = 0; i < n; i++)
close(fds[i]);
} else {
addrlen = sizeof(his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr,
&addrlen) == -1) {
/* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */
exit(1);
}
}
/* set this here so klogin can use it... */
(void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid());
set_slave_signals();
addrlen = sizeof(ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) == -1) {
syslog(LOG_ERR, "getsockname: %m");
exit(1);
}
if (his_addr.su_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) {
syslog(LOG_WARNING,
"Connection from IPv4 mapped address is not supported.");
reply(530, "System not available.");
exit(1);
}
tos = IPTOS_LOWDELAY;
switch (his_addr.su_family) {
case AF_INET:
if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos,
sizeof(int)) == -1)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
break;
case AF_INET6:
if (setsockopt(0, IPPROTO_IPV6, IPV6_TCLASS, &tos,
sizeof(int)) == -1)
syslog(LOG_WARNING, "setsockopt (IPV6_TCLASS): %m");
break;
}
data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
/* Try to handle urgent data inline */
if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) == -1)
syslog(LOG_ERR, "setsockopt: %m");
dolog((struct sockaddr *)&his_addr);
/*
* Set up default state
*/
data = -1;
type = TYPE_A;
form = FORM_N;
stru = STRU_F;
mode = MODE_S;
tmpline[0] = '\0';
/* If logins are disabled, print out the message. */
if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL) {
line[strcspn(line, "\n")] = '\0';
lreply(530, "%s", line);
}
(void) fclose(fp);
reply(530, "System not available.");
exit(0);
}
if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL) {
line[strcspn(line, "\n")] = '\0';
lreply(220, "%s", line);
}
(void) fclose(fp);
/* reply(220,) must follow */
}
(void) gethostname(hostname, sizeof(hostname));
/* Make sure hostname is fully qualified. */
hp = gethostbyname(hostname);
if (hp != NULL)
strlcpy(hostname, hp->h_name, sizeof(hostname));
if (multihome) {
error = getnameinfo((struct sockaddr *)&ctrl_addr,
ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0);
}
if (error != 0)
reply(220, "FTP server ready.");
else
reply(220, "%s FTP server ready.",
(multihome ? dhostname : hostname));
monitor_init();
for (;;)
(void) yyparse();
/* NOTREACHED */
}
/*
* Signal handlers.
*/
static void
lostconn(int signo)
{
struct syslog_data sdata = SYSLOG_DATA_INIT;
sdata.log_fac = LOG_FTP;
if (debug)
syslog_r(LOG_DEBUG, &sdata, "lost connection");
dologout(1);
}
static void
sigquit(int signo)
{
struct syslog_data sdata = SYSLOG_DATA_INIT;
sdata.log_fac = LOG_FTP;
syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]);
dologout(1);
}
/*
* 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).
*/
static struct passwd *
sgetpwnam(const char *name, struct passwd *pw)
{
static struct passwd *save;
struct passwd *old;
if (pw == NULL && (pw = getpwnam(name)) == NULL)
return (NULL);
old = save;
save = pw_dup(pw);
if (save == NULL) {
perror_reply(421, "Local resource failure: malloc");
dologout(1);
/* NOTREACHED */
}
if (old) {
explicit_bzero(old->pw_passwd, strlen(old->pw_passwd));
free(old);
}
return (save);
}
static int login_attempts; /* number of failed login attempts */
static int askpasswd; /* had user command, ask for passwd */
static char curname[LOGIN_NAME_MAX]; /* current USER name */
/*
* 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.
*/
void
user(char *name)
{
char *cp, *shell, *style, *host;
char *class = NULL;
if (logged_in) {
kill_slave("user already logged in");
end_login();
}
/* Close session from previous user if there was one. */
if (as) {
auth_close(as);
as = NULL;
}
if (lc) {
login_close(lc);
lc = NULL;
}
if ((style = strchr(name, ':')) != NULL)
*style++ = 0;
guest = 0;
askpasswd = 0;
host = multihome ? dhostname : hostname;
if (anon_ok &&
(strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) {
if (checkuser(_PATH_FTPUSERS, "ftp") ||
checkuser(_PATH_FTPUSERS, "anonymous"))
reply(530, "User %s access denied.", name);
else if ((pw = sgetpwnam("ftp", NULL)) != NULL) {
if ((lc = login_getclass(pw->pw_class)) == NULL ||
(as = auth_open()) == NULL ||
auth_setpwd(as, pw) != 0 ||
auth_setoption(as, "FTPD_HOST", host) < 0) {
if (as) {
auth_close(as);
as = NULL;
}
if (lc) {
login_close(lc);
lc = NULL;
}
reply(421, "Local resource failure");
return;
}
guest = 1;
askpasswd = 1;
reply(331,
"Guest login ok, send your email address as password.");
} else
reply(530, "User %s unknown.", name);
if (!askpasswd && logging)
syslog(LOG_NOTICE,
"ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
return;
}
shell = _PATH_BSHELL;
if ((pw = sgetpwnam(name, NULL))) {
class = pw->pw_class;
if (pw->pw_shell != NULL && *pw->pw_shell != '\0')
shell = pw->pw_shell;
while ((cp = getusershell()) != NULL)
if (strcmp(cp, shell) == 0)
break;
shell = cp;
endusershell();
}
/* Get login class; if invalid style treat like unknown user. */
lc = login_getclass(class);
if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) {
login_close(lc);
lc = NULL;
pw = NULL;
}
/* Do pre-authentication setup. */
if (lc && ((as = auth_open()) == NULL ||
(pw != NULL && auth_setpwd(as, pw) != 0) ||
auth_setitem(as, AUTHV_STYLE, style) < 0 ||
auth_setitem(as, AUTHV_NAME, name) < 0 ||
auth_setitem(as, AUTHV_CLASS, class) < 0 ||
auth_setoption(as, "login", "yes") < 0 ||
auth_setoption(as, "notickets", "yes") < 0 ||
auth_setoption(as, "FTPD_HOST", host) < 0)) {
if (as) {
auth_close(as);
as = NULL;
}
login_close(lc);
lc = NULL;
reply(421, "Local resource failure");
return;
}
if (logging)
strlcpy(curname, name, sizeof(curname));
dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) ||
checkuser(_PATH_FTPCHROOT, name);
if (anon_only && !dochroot) {
reply(530, "User %s access denied.", name);
return;
}
if (pw) {
if (pw->pw_uid < minuid) {
reply(530, "User %s access denied.", name);
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED FROM %s, %s (UID))",
remotehost, name);
return;
}
if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) {
reply(530, "User %s access denied.", name);
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED FROM %s, %s",
remotehost, name);
pw = NULL;
return;
}
}
if (as != NULL && (cp = auth_challenge(as)) != NULL)
reply(331, "%s", cp);
else
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 "fname"
*/
static int
checkuser(char *fname, const char *name)
{
FILE *fp;
int found = 0;
char *p, line[BUFSIZ];
if ((fp = fopen(fname, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL)
if ((p = strchr(line, '\n')) != NULL) {
*p = '\0';
if (line[0] == '#')
continue;
if (strcmp(line, name) == 0) {
found = 1;
break;
}
}
(void) fclose(fp);
}
return (found);
}
/*
* Terminate login as previous user, if any, resetting state;
* used when USER command is given or login fails.
*/
static void
end_login(void)
{
sigprocmask (SIG_BLOCK, &allsigs, NULL);
if (logged_in) {
if (!nowtmp)
ftpdlogwtmp(ttyline, "", "");
if (doutmp)
ftpd_logout(utmp.ut_line);
}
reply(530, "Please reconnect to work as another user");
_exit(0);
}
enum auth_ret
pass(char *passwd)
{
int authok;
unsigned int flags;
FILE *fp;
static char homedir[PATH_MAX];
char *motd, *dir, rootdir[PATH_MAX];
size_t sz_pw_dir;
if (logged_in || askpasswd == 0) {
reply(503, "Login with USER first.");
return (AUTH_FAILED);
}
askpasswd = 0;
if (!guest) { /* "ftp" is only account allowed no password */
authok = 0;
if (pw == NULL || pw->pw_passwd[0] == '\0') {
useconds_t us;
/* Sleep between 1 and 3 seconds to emulate a crypt. */
us = arc4random_uniform(3000000);
usleep(us);
if (as != NULL) {
auth_close(as);
as = NULL;
}
} else {
authok = auth_userresponse(as, passwd, 0);
as = NULL;
}
if (authok == 0) {
reply(530, "Login incorrect.");
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN FAILED FROM %s, %s",
remotehost, curname);
pw = NULL;
if (login_attempts++ >= 5) {
syslog(LOG_NOTICE,
"repeated login failures from %s",
remotehost);
kill_slave("repeated login failures");
_exit(0);
}
return (AUTH_FAILED);
}
} else if (lc != NULL) {
/* Save anonymous' password. */
free(guestpw);
guestpw = strdup(passwd);
if (guestpw == NULL) {
kill_slave("out of mem");
fatal("Out of memory.");
}
authok = auth_approval(as, lc, pw->pw_name, "ftp");
auth_close(as);
as = NULL;
if (authok == 0) {
syslog(LOG_INFO|LOG_AUTH,
"FTP LOGIN FAILED (HOST) as %s: approval failure.",
pw->pw_name);
reply(530, "Approval failure.");
kill_slave("approval failure");
_exit(0);
}
} else {
syslog(LOG_INFO|LOG_AUTH,
"FTP LOGIN CLASS %s MISSING for %s: approval failure.",
pw->pw_class, pw->pw_name);
reply(530, "Permission denied.");
kill_slave("permission denied");
_exit(0);
}
if (monitor_post_auth() == 1) {
/* Post-auth monitor process */
logged_in = 1;
return (AUTH_MONITOR);
}
login_attempts = 0; /* this time successful */
/* set umask via setusercontext() unless -u flag was given. */
flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES;
if (umaskchange)
flags |= LOGIN_SETUMASK;
else
(void) umask(defumask);
if (setusercontext(lc, pw, 0, flags) != 0) {
perror_reply(421, "Local resource failure: setusercontext");
syslog(LOG_NOTICE, "setusercontext: %m");
dologout(1);
/* NOTREACHED */
}
/* open wtmp before chroot */
if (!nowtmp)
ftpdlogwtmp(ttyline, pw->pw_name, remotehost);
/* open utmp before chroot */
if (doutmp) {
memset(&utmp, 0, sizeof(utmp));
(void)time(&utmp.ut_time);
(void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name));
(void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host));
(void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line));
ftpd_login(&utmp);
}
/* open stats file before chroot */
if (guest && (stats == 1) && (statfd < 0))
if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) == -1)
stats = 0;
logged_in = 1;
if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) {
char *newdir;
newdir = copy_dir(dir, pw);
if (newdir == NULL) {
perror_reply(421, "Local resource failure: malloc");
dologout(1);
/* NOTREACHED */
}
pw->pw_dir = newdir;
pw = sgetpwnam(NULL, pw);
free(dir);
free(newdir);
}
/* make sure pw->pw_dir is big enough to hold "/" */
sz_pw_dir = strlen(pw->pw_dir) + 1;
if (sz_pw_dir < 2) {
pw->pw_dir = "/";
pw = sgetpwnam(NULL, pw);
sz_pw_dir = 2;
}
if (guest || dochroot) {
if (multihome && guest) {
struct stat ts;
/* Compute root directory. */
snprintf(rootdir, sizeof(rootdir), "%s/%s",
pw->pw_dir, dhostname);
if (stat(rootdir, &ts) == -1) {
snprintf(rootdir, sizeof(rootdir), "%s/%s",
pw->pw_dir, hostname);
}
} else
strlcpy(rootdir, pw->pw_dir, sizeof(rootdir));
}
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(rootdir) == -1 || chdir("/") == -1) {
reply(550, "Can't set guest privileges.");
goto bad;
}
strlcpy(pw->pw_dir, "/", sz_pw_dir);
if (setenv("HOME", "/", 1) == -1) {
reply(550, "Can't setup environment.");
goto bad;
}
} else if (dochroot) {
if (chroot(rootdir) == -1 || chdir("/") == -1) {
reply(550, "Can't change root.");
goto bad;
}
strlcpy(pw->pw_dir, "/", sz_pw_dir);
if (setenv("HOME", "/", 1) == -1) {
reply(550, "Can't setup environment.");
goto bad;
}
} else if (chdir(pw->pw_dir) == -1) {
if (chdir("/") == -1) {
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 (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
reply(550, "Can't set gid.");
goto bad;
}
if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
reply(550, "Can't set uid.");
goto bad;
}
sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
/*
* Set home directory so that use of ~ (tilde) works correctly.
*/
if (getcwd(homedir, PATH_MAX) != NULL) {
if (setenv("HOME", homedir, 1) == -1) {
reply(550, "Can't setup environment.");
goto bad;
}
}
/*
* Display a login message, if it exists.
* N.B. reply(230,) must follow the message.
*/
motd = login_getcapstr(lc, "welcome", NULL, NULL);
if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) {
char line[LINE_MAX];
while (fgets(line, sizeof(line), fp) != NULL) {
line[strcspn(line, "\n")] = '\0';
lreply(230, "%s", line);
}
(void) fclose(fp);
}
free(motd);
if (guest) {
reply(230, "Guest login ok, access restrictions apply.");
snprintf(proctitle, sizeof(proctitle),
"%s: anonymous/%.*s", remotehost,
(int)(sizeof(proctitle) - sizeof(remotehost) -
sizeof(": anonymous/")), passwd);
setproctitle("%s", proctitle);
if (logging)
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
remotehost, passwd);
} else {
reply(230, "User %s logged in.", pw->pw_name);
snprintf(proctitle, sizeof(proctitle),
"%s: %s", remotehost, pw->pw_name);
setproctitle("%s", proctitle);
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
remotehost, pw->pw_name);
}
login_close(lc);
lc = NULL;
return (AUTH_SLAVE);
bad:
/* Forget all about it... */
login_close(lc);
lc = NULL;
end_login();
return (AUTH_FAILED);
}
void
retrieve(enum ret_cmd cmd, const char *name)
{
FILE *fin, *dout;
struct stat st;
pid_t pid;
time_t start;
if (cmd == RET_FILE) {
fin = fopen(name, "r");
st.st_size = 0;
} else {
fin = ftpd_ls(name, &pid);
st.st_size = -1;
st.st_blksize = BUFSIZ;
}
if (fin == NULL) {
if (errno != 0) {
perror_reply(550, name);
if (cmd == RET_FILE) {
LOGCMD("get", name);
}
}
return;
}
byte_count = -1;
if (cmd == RET_FILE &&
(fstat(fileno(fin), &st) == -1 || !S_ISREG(st.st_mode))) {
reply(550, "%s: not a plain file.", name);
goto done;
}
if (restart_point) {
if (type == TYPE_A) {
off_t i, n;
int c;
n = restart_point;
i = 0;
while (i++ < n) {
if ((c = getc(fin)) == EOF) {
if (ferror(fin)) {
perror_reply(550, name);
goto done;
} else
break;
}
if (c == '\n')
i++;
}
} else if (lseek(fileno(fin), restart_point, SEEK_SET) == -1) {
perror_reply(550, name);
goto done;
}
}
dout = dataconn(name, st.st_size, "w");
if (dout == NULL)
goto done;
time(&start);
send_data(fin, dout, st.st_blksize, st.st_size,
(restart_point == 0 && cmd == RET_FILE && S_ISREG(st.st_mode)));
if ((cmd == RET_FILE) && stats)
logxfer(name, byte_count, start);
(void) fclose(dout);
data = -1;
done:
if (pdata >= 0)
(void) close(pdata);
pdata = -1;
if (cmd == RET_FILE) {
LOGBYTES("get", name, byte_count);
fclose(fin);
} else {
ftpd_pclose(fin, pid);
}
}
void
store(const char *name, const char *mode, int unique)
{
FILE *fout, *din;
int (*closefunc)(FILE *);
struct stat st;
int fd;
if (restart_point && *mode != 'a')
mode = "r+";
if (unique && stat(name, &st) == 0) {
char *nam;
fd = guniquefd(name, &nam);
if (fd == -1) {
LOGCMD(*mode == 'w' ? "put" : "append", name);
return;
}
name = nam;
fout = fdopen(fd, mode);
} else
fout = fopen(name, mode);
closefunc = fclose;
if (fout == NULL) {
perror_reply(553, name);
LOGCMD(*mode == 'w' ? "put" : "append", name);
return;
}
byte_count = -1;
if (restart_point) {
if (type == TYPE_A) {
off_t i, n;
int c;
n = restart_point;
i = 0;
while (i++ < n) {
if ((c = getc(fout)) == EOF) {
if (ferror(fout)) {
perror_reply(550, name);
goto done;
} else
break;
}
if (c == '\n')
i++;
}
/*
* We must do this seek to "current" position
* because we are changing from reading to
* writing.
*/
if (fseek(fout, 0, SEEK_CUR) == -1) {
perror_reply(550, name);
goto done;
}
} else if (lseek(fileno(fout), restart_point, SEEK_SET) == -1) {
perror_reply(550, name);
goto done;
}
}
din = dataconn(name, -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:
LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
(*closefunc)(fout);
}
static FILE *
getdatasock(char *mode)
{
int opt, s, t, tries;
if (data >= 0)
return (fdopen(data, mode));
sigprocmask (SIG_BLOCK, &allsigs, NULL);
s = monitor_socket(ctrl_addr.su_family);
if (s < 0)
goto bad;
opt = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
&opt, sizeof(opt)) == -1)
goto bad;
/* anchor socket to avoid multi-homing problems */
data_source = ctrl_addr;
data_source.su_port = htons(20); /* ftp-data port */
for (tries = 1; ; tries++) {
if (monitor_bind(s, (struct sockaddr *)&data_source,
data_source.su_len) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep((unsigned int)tries);
}
sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
opt = IPTOS_THROUGHPUT;
switch (ctrl_addr.su_family) {
case AF_INET:
if (setsockopt(s, IPPROTO_IP, IP_TOS, &opt,
sizeof(opt)) == -1)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
break;
case AF_INET6:
if (setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &opt,
sizeof(opt)) == -1)
syslog(LOG_WARNING, "setsockopt (IPV6_TCLASS): %m");
break;
}
/*
* Turn off push flag to keep sender TCP from sending short packets
* at the boundaries of each write(). Should probably do a SO_SNDBUF
* to set the send buffer size as well, but that may not be desirable
* in heavy-load situations.
*/
opt = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &opt, sizeof(opt)) == -1)
syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m");
opt = 65536;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &opt, sizeof(opt)) == -1)
syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m");
return (fdopen(s, mode));
bad:
/* Return the real value of errno (close may change it) */
t = errno;
sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
if (s >= 0)
(void) close(s);
errno = t;
return (NULL);
}
static FILE *
dataconn(const char *name, off_t size, char *mode)
{
char sizebuf[32];
FILE *file = NULL;
int retry = 0;
in_port_t *p;
u_char *fa, *ha;
size_t alen;
int error;
file_size = size;
byte_count = 0;
if (size != -1) {
(void) snprintf(sizebuf, sizeof(sizebuf), " (%lld bytes)",
(long long)size);
} else
sizebuf[0] = '\0';
if (pdata >= 0) {
union sockunion from;
int s;
socklen_t fromlen = sizeof(from);
(void) alarm ((unsigned) timeout);
s = accept(pdata, (struct sockaddr *)&from, &fromlen);
(void) alarm (0);
if (s == -1) {
reply(425, "Can't open data connection.");
(void) close(pdata);
pdata = -1;
return (NULL);
}
switch (from.su_family) {
case AF_INET:
p = (in_port_t *)&from.su_sin.sin_port;
fa = (u_char *)&from.su_sin.sin_addr;
ha = (u_char *)&his_addr.su_sin.sin_addr;
alen = sizeof(struct in_addr);
break;
case AF_INET6:
p = (in_port_t *)&from.su_sin6.sin6_port;
fa = (u_char *)&from.su_sin6.sin6_addr;
ha = (u_char *)&his_addr.su_sin6.sin6_addr;
alen = sizeof(struct in6_addr);
break;
default:
reply(425, "Can't build data connection: "
"unknown address family");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
if (from.su_family != his_addr.su_family ||
ntohs(*p) < IPPORT_RESERVED) {
reply(425, "Can't build data connection: "
"address family or port error");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
if (portcheck && memcmp(fa, ha, alen) != 0) {
reply(425, "Can't build data connection: "
"illegal port number");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
(void) close(pdata);
pdata = s;
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;
do {
if (file != NULL)
(void) fclose(file);
file = getdatasock(mode);
if (file == NULL) {
char hbuf[HOST_NAME_MAX+1], pbuf[10];
error = getnameinfo((struct sockaddr *)&data_source,
data_source.su_len, hbuf, sizeof(hbuf), pbuf,
sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV);
if (error != 0)
reply(425, "Can't create data socket: %s.",
strerror(errno));
else
reply(425,
"Can't create data socket (%s,%s): %s.",
hbuf, pbuf, strerror(errno));
return (NULL);
}
/*
* attempt to connect to reserved port on client machine;
* this looks like an attack
*/
switch (data_dest.su_family) {
case AF_INET:
p = (in_port_t *)&data_dest.su_sin.sin_port;
fa = (u_char *)&data_dest.su_sin.sin_addr;
ha = (u_char *)&his_addr.su_sin.sin_addr;
alen = sizeof(struct in_addr);
break;
case AF_INET6:
p = (in_port_t *)&data_dest.su_sin6.sin6_port;
fa = (u_char *)&data_dest.su_sin6.sin6_addr;
ha = (u_char *)&his_addr.su_sin6.sin6_addr;
alen = sizeof(struct in6_addr);
break;
default:
reply(425, "Can't build data connection: "
"unknown address family");
(void) fclose(file);
pdata = -1;
return (NULL);
}
if (data_dest.su_family != his_addr.su_family ||
ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */
reply(425, "Can't build data connection: "
"address family or port error");
(void) fclose(file);
return NULL;
}
if (portcheck && memcmp(fa, ha, alen) != 0) {
reply(435, "Can't build data connection: "
"illegal port number");
(void) fclose(file);
return NULL;
}
if (connect(fileno(file), (struct sockaddr *)&data_dest,
data_dest.su_len) == 0) {
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
data = fileno(file);
return (file);
}
if (errno != EADDRINUSE)
break;
sleep((unsigned) swaitint);
retry += swaitint;
} while (retry <= swaitmax);
perror_reply(425, "Can't build data connection");
(void) fclose(file);
return (NULL);
}
/*
* Transfer 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.
*/
static int
send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg)
{
int c, cnt, filefd, netfd;
char *buf, *bp;
size_t len;
transflag++;
switch (type) {
case TYPE_A:
while ((c = getc(instr)) != EOF) {
if (recvurg)
goto got_oob;
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(0);
case TYPE_I:
case TYPE_L:
/*
* isreg is only set if we are not doing restart and we
* are sending a regular file
*/
netfd = fileno(outstr);
filefd = fileno(instr);
if (isreg && filesize < 16 * 1024 * 1024) {
size_t fsize = (size_t)filesize;
if (fsize == 0) {
transflag = 0;
reply(226, "Transfer complete.");
return(0);
}
buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 0);
if (buf == MAP_FAILED) {
syslog(LOG_WARNING, "mmap(%llu): %m",
(unsigned long long)fsize);
goto oldway;
}
bp = buf;
len = fsize;
do {
cnt = write(netfd, bp, len);
if (recvurg) {
munmap(buf, fsize);
goto got_oob;
}
len -= cnt;
bp += cnt;
if (cnt > 0)
byte_count += cnt;
} while(cnt > 0 && len > 0);
transflag = 0;
munmap(buf, fsize);
if (cnt < 0)
goto data_err;
reply(226, "Transfer complete.");
return(0);
}
oldway:
if ((buf = malloc((size_t)blksize)) == NULL) {
transflag = 0;
perror_reply(451, "Local resource failure: malloc");
return(-1);
}
while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 &&
write(netfd, buf, cnt) == cnt)
byte_count += cnt;
transflag = 0;
(void)free(buf);
if (cnt != 0) {
if (cnt == -1)
goto file_err;
goto data_err;
}
reply(226, "Transfer complete.");
return(0);
default:
transflag = 0;
reply(550, "Unimplemented TYPE %d in send_data", type);
return(-1);
}
data_err:
transflag = 0;
reply(426, "Data connection");
return(-1);
file_err:
transflag = 0;
reply(551, "Error on input file");
return(-1);
got_oob:
myoob();
recvurg = 0;
transflag = 0;
return(-1);
}
/*
* 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.
*/
static int
receive_data(FILE *instr, FILE *outstr)
{
int c;
int cnt;
char buf[BUFSIZ];
struct sigaction sa, sa_saved;
volatile int bare_lfs = 0;
transflag++;
switch (type) {
case TYPE_I:
case TYPE_L:
memset(&sa, 0, sizeof(sa));
sigfillset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = lostconn;
(void) sigaction(SIGALRM, &sa, &sa_saved);
do {
(void) alarm ((unsigned) timeout);
cnt = read(fileno(instr), buf, sizeof(buf));
(void) alarm (0);
if (recvurg)
goto got_oob;
if (cnt > 0) {
if (write(fileno(outstr), buf, cnt) != cnt)
goto file_err;
byte_count += cnt;
}
} while (cnt > 0);
(void) sigaction(SIGALRM, &sa_saved, NULL);
if (cnt == -1)
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) {
if (recvurg)
goto got_oob;
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(226,
"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;
reply(426, "Data Connection");
return (-1);
file_err:
transflag = 0;
reply(452, "Error writing file");
return (-1);
got_oob:
myoob();
recvurg = 0;
transflag = 0;
return (-1);
}
void
statfilecmd(const char *filename)
{
FILE *fin;
int c;
int atstart;
pid_t pid;
fin = ftpd_ls(filename, &pid);
if (fin == NULL) {
reply(451, "Local resource failure");
return;
}
lreply(211, "status of %s:", filename);
atstart = 1;
while ((c = getc(fin)) != EOF) {
if (c == '\n') {
if (ferror(stdout)){
perror_reply(421, "control connection");
(void) ftpd_pclose(fin, pid);
dologout(1);
/* NOTREACHED */
}
if (ferror(fin)) {
perror_reply(551, filename);
(void) ftpd_pclose(fin, pid);
return;
}
(void) putc('\r', stdout);
}
if (atstart && isdigit(c))
(void) putc(' ', stdout);
(void) putc(c, stdout);
atstart = (c == '\n');
}
(void) ftpd_pclose(fin, pid);
reply(211, "End of Status");
}
void
statcmd(void)
{
union sockunion *su;
u_char *a, *p;
char hbuf[HOST_NAME_MAX+1];
int ispassive;
int error;
lreply(211, "%s FTP server status:", hostname);
error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST);
printf(" Connected to %s", remotehost);
if (error == 0 && strcmp(remotehost, hbuf) != 0)
printf(" (%s)", hbuf);
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)
printf(" 8");
printf("; STRUcture: %s; transfer MODE: %s\r\n",
strunames[stru], modenames[mode]);
ispassive = 0;
if (data != -1)
printf(" Data connection open\r\n");
else if (pdata != -1) {
printf(" in Passive mode\r\n");
su = (union sockunion *)&pasv_addr;
ispassive++;
goto printaddr;
} else if (usedefault == 0) {
size_t alen, i;
int af;
su = (union sockunion *)&data_dest;
printaddr:
/* PASV/PORT */
if (su->su_family == AF_INET) {
if (ispassive)
printf("211- PASV ");
else
printf("211- PORT ");
a = (u_char *)&su->su_sin.sin_addr;
p = (u_char *)&su->su_sin.sin_port;
printf("(%u,%u,%u,%u,%u,%u)\r\n",
a[0], a[1], a[2], a[3],
p[0], p[1]);
}
/* LPSV/LPRT */
alen = 0;
switch (su->su_family) {
case AF_INET:
a = (u_char *)&su->su_sin.sin_addr;
p = (u_char *)&su->su_sin.sin_port;
alen = sizeof(su->su_sin.sin_addr);
af = 4;
break;
case AF_INET6:
a = (u_char *)&su->su_sin6.sin6_addr;
p = (u_char *)&su->su_sin6.sin6_port;
alen = sizeof(su->su_sin6.sin6_addr);
af = 6;
break;
default:
af = 0;
break;
}
if (af) {
if (ispassive)
printf("211- LPSV ");
else
printf("211- LPRT ");
printf("(%u,%llu", af, (unsigned long long)alen);
for (i = 0; i < alen; i++)
printf(",%u", a[i]);
printf(",%u,%u,%u)\r\n", 2, p[0], p[1]);
}
/* EPRT/EPSV */
switch (su->su_family) {
case AF_INET:
af = 1;
break;
case AF_INET6:
af = 2;
break;
default:
af = 0;
break;
}
if (af) {
char pbuf[10];
union sockunion tmp = *su;
if (tmp.su_family == AF_INET6)
tmp.su_sin6.sin6_scope_id = 0;
if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
if (ispassive)
printf("211- EPSV ");
else
printf("211- EPRT ");
printf("(|%u|%s|%s|)\r\n",
af, hbuf, pbuf);
}
}
} else
printf(" No data connection\r\n");
reply(211, "End of status");
}
void
fatal(const char *s)
{
reply(451, "Error in server: %s", s);
reply(221, "Closing connection due to server error.");
dologout(0);
/* NOTREACHED */
}
void
reply(int n, const char *fmt, ...)
{
char *buf, *p, *next;
int rval;
va_list ap;
va_start(ap, fmt);
rval = vasprintf(&buf, fmt, ap);
va_end(ap);
if (rval == -1 || buf == NULL) {
printf("421 Local resource failure: malloc\r\n");
fflush(stdout);
dologout(1);
}
next = buf;
while ((p = strsep(&next, "\n\r"))) {
printf("%d%s %s\r\n", n, (next != NULL) ? "-" : "", p);
if (debug)
syslog(LOG_DEBUG, "<--- %d%s %s", n,
(next != NULL) ? "-" : "", p);
}
(void)fflush(stdout);
free(buf);
}
void
reply_r(int n, const char *fmt, ...)
{
char *p, *next;
char msg[BUFSIZ];
char buf[BUFSIZ];
va_list ap;
struct syslog_data sdata = SYSLOG_DATA_INIT;
sdata.log_fac = LOG_FTP;
va_start(ap, fmt);
vsnprintf(msg, sizeof(msg), fmt, ap);
va_end(ap);
next = msg;
while ((p = strsep(&next, "\n\r"))) {
snprintf(buf, sizeof(buf), "%d%s %s\r\n", n,
(next != NULL) ? "-" : "", p);
write(STDOUT_FILENO, buf, strlen(buf));
if (debug) {
buf[strlen(buf) - 2] = '\0';
syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf);
}
}
}
void
lreply(int n, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
(void)printf("%d- ", n);
(void)vprintf(fmt, ap);
va_end(ap);
(void)printf("\r\n");
(void)fflush(stdout);
if (debug) {
va_start(ap, fmt);
syslog(LOG_DEBUG, "<--- %d- ", n);
vsyslog(LOG_DEBUG, fmt, ap);
va_end(ap);
}
}
static void
ack(const char *s)
{
reply(250, "%s command successful.", s);
}
void
nack(const char *s)
{
reply(502, "%s command not implemented.", s);
}
void
yyerror(char *s)
{
cbuf[strcspn(cbuf, "\n")] = '\0';
reply(500, "'%s': command not understood.", cbuf);
}
void
delete(const char *name)
{
struct stat st;
LOGCMD("delete", name);
if (stat(name, &st) == -1) {
perror_reply(550, name);
return;
}
if ((st.st_mode&S_IFMT) == S_IFDIR) {
if (rmdir(name) == -1) {
perror_reply(550, name);
return;
}
goto done;
}
if (unlink(name) == -1) {
perror_reply(550, name);
return;
}
done:
ack("DELE");
}
void
cwd(char *path)
{
FILE *message;
if (chdir(path) == -1)
perror_reply(550, path);
else {
if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) {
char line[LINE_MAX];
while (fgets(line, sizeof(line), message) != NULL) {
line[strcspn(line, "\n")] = '\0';
lreply(250, "%s", line);
}
(void) fclose(message);
}
ack("CWD");
}
}
void
replydirname(const char *name, const char *message)
{
char *p, *ep;
char npath[PATH_MAX * 2];
p = npath;
ep = &npath[sizeof(npath) - 1];
while (*name) {
if (*name == '"') {
if (ep - p < 2)
break;
*p++ = *name++;
*p++ = '"';
} else {
if (ep - p < 1)
break;
*p++ = *name++;
}
}
*p = '\0';
reply(257, "\"%s\" %s", npath, message);
}
void
makedir(const char *name)
{
LOGCMD("mkdir", name);
if (mkdir(name, 0777) == -1)
perror_reply(550, name);
else
replydirname(name, "directory created.");
}
void
removedir(const char *name)
{
LOGCMD("rmdir", name);
if (rmdir(name) == -1)
perror_reply(550, name);
else
ack("RMD");
}
void
pwd(void)
{
char path[PATH_MAX];
if (getcwd(path, sizeof(path)) == NULL)
perror_reply(550, "Can't get current directory");
else
replydirname(path, "is current directory.");
}
char *
renamefrom(char *name)
{
struct stat st;
if (stat(name, &st) == -1) {
perror_reply(550, name);
return (NULL);
}
reply(350, "File exists, ready for destination name");
return (name);
}
void
renamecmd(const char *from, const char *to)
{
LOGCMD2("rename", from, to);
if (rename(from, to) == -1)
perror_reply(550, "rename");
else
ack("RNTO");
}
static void
dolog(struct sockaddr *sa)
{
char hbuf[sizeof(remotehost)];
if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0)
(void) strlcpy(remotehost, hbuf, sizeof(remotehost));
else
(void) strlcpy(remotehost, "unknown", sizeof(remotehost));
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
setproctitle("%s", proctitle);
if (logging) {
int error;
error = getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf),
NULL, 0, NI_NUMERICHOST);
syslog(LOG_INFO, "connection from %s [%s]", remotehost,
error ? gai_strerror(error) : hbuf);
}
}
/*
* Record logout in wtmp file and exit with supplied status.
* NOTE: because this is called from signal handlers it cannot
* use stdio (or call other functions that use stdio).
*/
void
dologout(int status)
{
transflag = 0;
if (logged_in) {
sigprocmask(SIG_BLOCK, &allsigs, NULL);
if (!nowtmp)
ftpdlogwtmp(ttyline, "", "");
if (doutmp)
ftpd_logout(utmp.ut_line);
}
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
static void
sigurg(int signo)
{
recvurg = 1;
}
static void
myoob(void)
{
char *cp;
int ret;
/* only process if transfer occurring */
if (!transflag)
return;
cp = tmpline;
ret = get_line(cp, sizeof(tmpline)-1);
if (ret == -1) {
reply(221, "You could at least say goodbye.");
dologout(0);
} else if (ret == -2) {
/* Ignore truncated command */
return;
}
upper(cp);
if (strcmp(cp, "ABOR\r\n") == 0) {
tmpline[0] = '\0';
reply(426, "Transfer aborted. Data connection closed.");
reply(226, "Abort successful");
}
if (strcmp(cp, "STAT\r\n") == 0) {
tmpline[0] = '\0';
if (file_size != -1)
reply(213, "Status: %lld of %lld bytes transferred",
(long long)byte_count, (long long)file_size);
else
reply(213, "Status: %lld bytes transferred",
(long long)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.
*/
void
passive(void)
{
socklen_t len;
int on = 1;
u_char *p, *a;
if (pw == NULL) {
reply(530, "Please login with USER and PASS");
return;
}
if (pdata >= 0)
close(pdata);
/*
* XXX
* At this point, it would be nice to have an algorithm that
* inserted a growing delay in an attack scenario. Such a thing
* would look like continual passive sockets being opened, but
* nothing serious being done with them. They're not used to
* move data; the entire attempt is just to use tcp FIN_WAIT
* resources.
*/
pdata = socket(AF_INET, SOCK_STREAM, 0);
if (pdata == -1) {
perror_reply(425, "Can't open passive connection");
return;
}
if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE,
&on, sizeof(on)) == -1)
goto pasv_error;
on = IP_PORTRANGE_HIGH;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
&on, sizeof(on)) == -1)
goto pasv_error;
pasv_addr = ctrl_addr;
pasv_addr.su_sin.sin_port = 0;
if (bind(pdata, (struct sockaddr *)&pasv_addr,
pasv_addr.su_len) == -1)
goto pasv_error;
len = sizeof(pasv_addr);
if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) == -1)
goto pasv_error;
if (listen(pdata, 1) == -1)
goto pasv_error;
a = (u_char *)&pasv_addr.su_sin.sin_addr;
p = (u_char *)&pasv_addr.su_sin.sin_port;
reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0],
a[1], a[2], a[3], p[0], p[1]);
return;
pasv_error:
perror_reply(425, "Can't open passive connection");
(void) close(pdata);
pdata = -1;
return;
}
int
epsvproto2af(int proto)
{
switch (proto) {
case 1: return AF_INET;
case 2: return AF_INET6;
default: return -1;
}
}
int
af2epsvproto(int af)
{
switch (af) {
case AF_INET: return 1;
case AF_INET6: return 2;
default: return -1;
}
}
/*
* 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...)
* 229 Entering Extended Passive Mode (|||port|)
*/
void
long_passive(const char *cmd, int pf)
{
socklen_t len;
int on = 1;
u_char *p, *a;
if (!logged_in) {
syslog(LOG_NOTICE, "long passive but not logged in");
reply(503, "Login with USER first.");
return;
}
if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) {
/*
* XXX
* only EPRT/EPSV ready clients will understand this
*/
if (strcmp(cmd, "EPSV") != 0)
reply(501, "Network protocol mismatch"); /*XXX*/
else
epsv_protounsupp("Network protocol mismatch");
return;
}
if (pdata >= 0)
close(pdata);
/*
* XXX
* At this point, it would be nice to have an algorithm that
* inserted a growing delay in an attack scenario. Such a thing
* would look like continual passive sockets being opened, but
* nothing serious being done with them. They not used to move
* data; the entire attempt is just to use tcp FIN_WAIT
* resources.
*/
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (pdata == -1) {
perror_reply(425, "Can't open passive connection");
return;
}
if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE,
&on, sizeof(on)) == -1)
goto pasv_error;
switch (ctrl_addr.su_family) {
case AF_INET:
on = IP_PORTRANGE_HIGH;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
&on, sizeof(on)) == -1)
goto pasv_error;
break;
case AF_INET6:
on = IPV6_PORTRANGE_HIGH;
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
&on, sizeof(on)) == -1)
goto pasv_error;
break;
}
pasv_addr = ctrl_addr;
pasv_addr.su_port = 0;
if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) == -1)
goto pasv_error;
len = pasv_addr.su_len;
if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) == -1)
goto pasv_error;
if (listen(pdata, 1) == -1)
goto pasv_error;
p = (u_char *)&pasv_addr.su_port;
if (strcmp(cmd, "LPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
a = (u_char *)&pasv_addr.su_sin.sin_addr;
reply(228,
"Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)",
4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]);
return;
case AF_INET6:
a = (u_char *)&pasv_addr.su_sin6.sin6_addr;
reply(228,
"Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,"
"%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)",
6, 16, a[0], a[1], a[2], a[3], a[4],
a[5], a[6], a[7], a[8], a[9], a[10],
a[11], a[12], a[13], a[14], a[15],
2, p[0], p[1]);
return;
}
} else if (strcmp(cmd, "EPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
case AF_INET6:
reply(229, "Entering Extended Passive Mode (|||%u|)",
ntohs(pasv_addr.su_port));
return;
}
} else {
/* more proper error code? */
}
pasv_error:
perror_reply(425, "Can't open passive connection");
(void) close(pdata);
pdata = -1;
return;
}
/*
* EPRT |proto|addr|port|
*/
int
extended_port(const char *arg)
{
char *tmp = NULL;
char *result[3];
char *p, *q;
char delim;
struct addrinfo hints;
struct addrinfo *res = NULL;
int i;
unsigned long proto;
if (epsvall) {
reply(501, "EPRT disallowed after EPSV ALL");
return -1;
}
usedefault = 0;
if (pdata >= 0) {
(void) close(pdata);
pdata = -1;
}
tmp = strdup(arg);
if (!tmp) {
fatal("not enough core.");
/*NOTREACHED*/
}
p = tmp;
delim = p[0];
p++;
memset(result, 0, sizeof(result));
for (i = 0; i < 3; i++) {
q = strchr(p, delim);
if (!q || *q != delim)
goto parsefail;
*q++ = '\0';
result[i] = p;
p = q;
}
/* some more sanity check */
p = NULL;
(void)strtoul(result[2], &p, 10);
if (!*result[2] || *p)
goto protounsupp;
p = NULL;
proto = strtoul(result[0], &p, 10);
if (!*result[0] || *p)
goto protounsupp;
memset(&hints, 0, sizeof(hints));
hints.ai_family = epsvproto2af((int)proto);
if (hints.ai_family < 0)
goto protounsupp;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST; /*no DNS*/
if (getaddrinfo(result[1], result[2], &hints, &res))
goto parsefail;
if (res->ai_next)
goto parsefail;
if (sizeof(data_dest) < res->ai_addrlen)
goto parsefail;
memcpy(&data_dest, res->ai_addr, res->ai_addrlen);
if (his_addr.su_family == AF_INET6 &&
data_dest.su_family == AF_INET6) {
/* XXX more sanity checks! */
data_dest.su_sin6.sin6_scope_id =
his_addr.su_sin6.sin6_scope_id;
}
if (pdata >= 0) {
(void) close(pdata);
pdata = -1;
}
reply(200, "EPRT command successful.");
free(tmp);
if (res)
freeaddrinfo(res);
return 0;
parsefail:
reply(500, "Invalid argument, rejected.");
usedefault = 1;
free(tmp);
if (res)
freeaddrinfo(res);
return -1;
protounsupp:
epsv_protounsupp("Protocol not supported");
usedefault = 1;
free(tmp);
if (res)
freeaddrinfo(res);
return -1;
}
/*
* 522 Protocol not supported (proto,...)
* as we assume address family for control and data connections are the same,
* we do not return the list of address families we support - instead, we
* return the address family of the control connection.
*/
void
epsv_protounsupp(const char *message)
{
int proto;
proto = af2epsvproto(ctrl_addr.su_family);
if (proto < 0)
reply(501, "%s", message); /*XXX*/
else
reply(522, "%s, use (%d)", message, proto);
}
/*
* Generate unique name for file with basename "local".
* The file named "local" is already known to exist.
* Generates failure reply on error.
*/
static int
guniquefd(const char *local, char **nam)
{
static char new[PATH_MAX];
struct stat st;
size_t len;
int count, fd;
char *cp;
cp = strrchr(local, '/');
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) == -1) {
perror_reply(553, cp ? local : ".");
return (-1);
}
if (cp)
*cp = '/';
len = strlcpy(new, local, sizeof(new));
if (len+2+1 >= sizeof(new)-1)
return (-1);
cp = new + len;
*cp++ = '.';
for (count = 1; count < 100; count++) {
(void)snprintf(cp, sizeof(new) - (cp - new), "%d", count);
fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666);
if (fd == -1)
continue;
if (nam)
*nam = new;
return (fd);
}
reply(452, "Unique file name cannot be created.");
return (-1);
}
/*
* Format and send reply containing system error number.
*/
void
perror_reply(int code, const char *string)
{
reply(code, "%s: %s.", string, strerror(errno));
}
static char *onefile[] = {
"",
0
};
void
send_file_list(char *whichf)
{
struct stat st;
DIR *dirp = NULL;
struct dirent *dir;
FILE *dout = NULL;
char **dirlist;
char *dirname;
int simple = 0;
volatile int freeglob = 0;
glob_t gl;
size_t prefixlen;
if (strpbrk(whichf, "~{[*?") != NULL) {
memset(&gl, 0, sizeof(gl));
freeglob = 1;
if (glob(whichf,
GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT,
0, &gl)) {
reply(550, "not found");
goto out;
} else if (gl.gl_pathc == 0) {
errno = ENOENT;
perror_reply(550, whichf);
goto out;
}
dirlist = gl.gl_pathv;
} else {
onefile[0] = whichf;
dirlist = onefile;
simple = 1;
}
while ((dirname = *dirlist++)) {
if (stat(dirname, &st) == -1) {
/*
* If user typed "ls -l", etc, and the client
* used NLST, do what the user meant.
*/
if (dirname[0] == '-' && *dirlist == NULL &&
transflag == 0) {
retrieve(RET_FILE, dirname);
goto out;
}
perror_reply(550, whichf);
if (dout != NULL) {
(void) fclose(dout);
transflag = 0;
data = -1;
pdata = -1;
}
goto out;
}
if (S_ISREG(st.st_mode)) {
if (dout == NULL) {
dout = dataconn("file list", -1, "w");
if (dout == NULL)
goto out;
transflag++;
}
fprintf(dout, "%s%s\n", dirname,
type == TYPE_A ? "\r" : "");
byte_count += strlen(dirname) + 1;
continue;
} else if (!S_ISDIR(st.st_mode))
continue;
if ((dirp = opendir(dirname)) == NULL)
continue;
if (dirname[0] == '.' && dirname[1] == '\0')
prefixlen = 0;
else
prefixlen = strlen(dirname) + 1;
while ((dir = readdir(dirp)) != NULL) {
if (recvurg) {
myoob();
recvurg = 0;
transflag = 0;
goto out;
}
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
continue;
if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
dir->d_namlen == 2)
continue;
/*
* We have to do a stat to insure it's
* not a directory or special file.
*/
if (simple ||
(fstatat(dirfd(dirp), dir->d_name, &st, 0) == 0 &&
S_ISREG(st.st_mode))) {
if (dout == NULL) {
dout = dataconn("file list", -1, "w");
if (dout == NULL)
goto out;
transflag++;
}
if (prefixlen) {
fprintf(dout, "%s/", dirname);
byte_count += prefixlen;
}
fprintf(dout, "%s%s\n", dir->d_name,
type == TYPE_A ? "\r" : "");
byte_count += dir->d_namlen + 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);
else {
if (pdata >= 0)
close(pdata);
}
data = -1;
pdata = -1;
out:
if (freeglob) {
freeglob = 0;
globfree(&gl);
}
}
static void
reapchild(int signo)
{
int save_errno = errno;
int rval;
do {
rval = waitpid(-1, NULL, WNOHANG);
} while (rval > 0 || (rval == -1 && errno == EINTR));
errno = save_errno;
}
void
logxfer(const char *name, off_t size, time_t start)
{
char buf[400 + (HOST_NAME_MAX+1)*4 + PATH_MAX*4];
char dir[PATH_MAX], path[PATH_MAX], rpath[PATH_MAX];
char vremotehost[(HOST_NAME_MAX+1)*4], vpath[PATH_MAX*4];
char *vpw;
time_t now;
int len;
if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) {
char *cnow;
time(&now);
cnow = ctime(&now);
vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1);
if (vpw == NULL)
return;
snprintf(path, sizeof(path), "%s/%s", dir, name);
if (realpath(path, rpath) == NULL)
strlcpy(rpath, path, sizeof(rpath));
strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH);
strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH);
strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH);
len = snprintf(buf, sizeof(buf),
"%.24s %lld %s %lld %s %c %s %c %c %s ftp %d %s %s\n",
cnow ? cnow : "?",
(long long)(now - start + (now == start)),
vremotehost, (long long)size, vpath,
((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */,
'o', ((guest) ? 'a' : 'r'),
vpw, 0 /* none yet */,
((guest) ? "*" : pw->pw_name), dhostname);
free(vpw);
if (len < 0 || len >= sizeof(buf)) {
if ((len = strlen(buf)) == 0)
return; /* should not happen */
buf[len - 1] = '\n';
}
write(statfd, buf, len);
}
}
void
set_slave_signals(void)
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
(void) sigaction(SIGCHLD, &sa, NULL);
sa.sa_handler = sigurg;
sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
(void) sigaction(SIGURG, &sa, NULL);
sigfillset(&sa.sa_mask); /* block all signals in handler */
sa.sa_flags = SA_RESTART;
sa.sa_handler = sigquit;
(void) sigaction(SIGHUP, &sa, NULL);
(void) sigaction(SIGINT, &sa, NULL);
(void) sigaction(SIGQUIT, &sa, NULL);
(void) sigaction(SIGTERM, &sa, NULL);
sa.sa_handler = lostconn;
(void) sigaction(SIGPIPE, &sa, NULL);
sa.sa_handler = toolong;
(void) sigaction(SIGALRM, &sa, NULL);
if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
syslog(LOG_ERR, "fcntl F_SETOWN: %m");
}
/*
* Allocate space and return a copy of the specified dir.
* If 'dir' begins with a tilde (~), expand it.
*/
char *
copy_dir(char *dir, struct passwd *pw)
{
char *cp;
char *newdir;
char *user = NULL;
/* Nothing to expand */
if (dir[0] != '~')
return (strdup(dir));
/* "dir" is of form ~user/some/dir, lookup user. */
if (dir[1] != '/' && dir[1] != '\0') {
if ((cp = strchr(dir + 1, '/')) == NULL)
cp = dir + strlen(dir);
if ((user = malloc((size_t)(cp - dir))) == NULL)
return (NULL);
strlcpy(user, dir + 1, (size_t)(cp - dir));
/* Only do lookup if it is a different user. */
if (strcmp(user, pw->pw_name) != 0) {
if ((pw = getpwnam(user)) == NULL) {
/* No such user, interpret literally */
free(user);
return(strdup(dir));
}
}
free(user);
}
/*
* If there is no directory separator (/) then it is just pw_dir.
* Otherwise, replace ~foo with pw_dir.
*/
if ((cp = strchr(dir + 1, '/')) == NULL) {
newdir = strdup(pw->pw_dir);
} else {
if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1)
return (NULL);
}
return(newdir);
}
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