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ftp.c
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ftp.c
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/*
$NiH: ftp.c,v 1.84 2004/03/08 12:22:05 dillo Exp $
ftp.c -- ftp protocol functions
Copyright (C) 1996-2002 Dieter Baron
This file is part of cftp, a fullscreen ftp client
The author can be contacted at <[email protected]>
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. The name of the author may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "directory.h"
#include "display.h"
#include "sockets.h"
#include "ftp.h"
#include "readdir.h"
#include "options.h"
#include "util.h"
#include "bindings.h"
#include "status.h"
#include "signals.h"
char *ftp_lcwd;
char *ftp_pcwd;
char ftp_curmode; /* current transfer mode (' ' for unknown) */
char *ftp_last_resp;
static char *_ftp_host, *_ftp_port, *_ftp_user, *_ftp_pass;
/* host, port, user, passwd (for reconnect) */
static int _ftp_anon; /* whether we're using anonymous ftp */
struct ftp_hist *ftp_history; /* command/response history */
struct ftp_hist *ftp_hist_last; /* tail of history */
int ftp_hist_cursize; /* size of history (for dynamic growth) */
static int _ftp_keptresp;
static int ftp_dosnames; /* server sends directory names in
DOS format */
char **ftp_response;
long ftp_response_size;
FILE *conin, *conout; /* control connection to server */
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
static struct sockaddr_storage _ftp_addr;
#else
static struct sockaddr _ftp_addr;
#endif
struct sockaddr *ftp_addr = (struct sockaddr *)&_ftp_addr;
/* local ip address (for port commands) */
struct _ftp_transfer_stats {
off_t got, start, size;
int secs, stall_sec;
int ncur, ccur;
off_t *cur;
};
static int ftp_abort(FILE *fin);
static FILE *ftp_accept(int fd, char *mode);
static int ftp_gethostaddr(int fd);
static int ftp_mode(char m);
static int ftp_port(void);
static int ftp_put(char *fmt, ...);
static int ftp_resp(void);
static void ftp_unresp(int resp);
static int _ftp_ascii2host(char *buf, char *buf2, int n, int *trail_cr);
static int _ftp_host2ascii(char *buf, char *buf2, int n, int *trail_cr);
static void _ftp_transfer_stats_init(struct _ftp_transfer_stats *tr,
off_t start, off_t size, int ncur);
static void _ftp_transfer_stats_cleanup(struct _ftp_transfer_stats *tr);
static void _ftp_update_transfer(struct _ftp_transfer_stats *tr, off_t got,
int secs);
void
ftp_init(void)
{
ftp_lcwd = ftp_pcwd = NULL;
ftp_curmode = ' ';
_ftp_anon = 0;
ftp_last_resp = NULL;
_ftp_host = _ftp_user = _ftp_port = _ftp_pass = NULL;
ftp_history = NULL;
_ftp_keptresp = -1;
ftp_dosnames = -1;
ftp_response = NULL;
ftp_response_size = 0;
conin = conout = NULL;
}
int
rftp_open(char *host, char *port, char *user, char *pass)
{
int fd, resp;
if (host) {
free(_ftp_host);
_ftp_host = strdup(host);
free(_ftp_port);
if (port && strcmp(port, "ftp") != 0)
_ftp_port = strdup(port);
else
_ftp_port = NULL;
}
if ((fd=sopen(_ftp_host, _ftp_port ? _ftp_port : "ftp", AF_UNSPEC)) == -1)
return -1;
if (ftp_gethostaddr(fd) == -1) {
close(fd);
return -1;
}
conin = fdopen(fd, "r");
conout = fdopen(fd, "w");
if (!conin || !conout) {
close(fd);
return -1;
}
if ((resp=ftp_resp()) == 120)
resp = ftp_resp();
if (resp != 220) {
close(fd);
return -1;
}
ftp_remember_user(user, pass);
return 0;
}
int
rftp_login(char *user, char *pass)
{
int resp;
char *b;
int free_pass;
status.host = mkhoststr(0, 0);
ftp_put("user %s", _ftp_user);
resp = ftp_resp();
if (resp == 331) {
free_pass = 0;
if (_ftp_pass)
pass = _ftp_pass;
else {
if (_ftp_anon) {
free_pass = 1;
pass = get_anon_passwd();
}
else {
b = (char *)malloc(strlen(status.host)+14);
sprintf(b, "Password (%s): ", status.host);
if (disp_active) {
pass = read_string(b, 0);
free_pass = 1;
}
else
pass = getpass(b);
free(b);
}
}
ftp_put("pass %s", pass);
resp = ftp_resp();
if (free_pass)
free(pass);
}
if (resp != 230)
return -1;
free(status.remote.path);
status.remote.path = NULL;
status_do(bs_none);
return 0;
}
int
rftp_site(char *cmd)
{
ftp_put("%s", cmd);
return ftp_resp();
}
int
ftp_reconnect(void)
{
if (_ftp_host == NULL)
return -1;
ftp_close();
disp_status(DISP_INFO, "connecting. . .");
if (ftp_open(NULL, NULL, NULL, NULL) == -1) {
/* Error printed in ftp_open or sopen. */
return -1;
}
if (ftp_login(NULL, NULL) == -1) {
/* ftp response is error message */
return -1;
}
status.remote.path = strdup(ftp_lcwd);
status_do(bs_remote);
ftp_pcwd = NULL;
ftp_curmode = ' ';
return 0;
}
int
rftp_close(void)
{
int err = 0;
if (conin == NULL)
return 0;
ftp_put("quit");
if (ftp_resp() != 221)
err = 1;
if (conin)
fclose(conin);
if (conout)
fclose(conout);
conin = conout = NULL;
return err;
}
directory *
rftp_list(char *path)
{
directory *dir;
int fd, resp;
FILE *f;
if (ftp_mode('a') == -1 || ftp_cwd(path) == -1)
return NULL;
if ((fd=ftp_port()) == -1)
return NULL;
ftp_put("list");
if ((resp=ftp_resp()) != 150 && resp != 125) {
close(fd);
dir = (directory *)malloc(sizeof(directory));
dir->line = (direntry *)malloc(sizeof(direntry));
dir->path = strdup(path);
dir->len = 0;
dir->cur = dir->top = 0;
dir->size = sizeof(struct direntry);
dir->line->line = strdup("");
dir->line->type = 'x';
dir->line->name = strdup("");
dir->line->link = NULL;
return dir;
}
if ((f=ftp_accept(fd, "r")) == NULL)
return NULL;
dir = read_dir(f);
if (dir)
dir->path = strdup(path);
fclose(f);
ftp_resp();
return dir;
}
directory *
ftp_cd(char *wd, int force)
{
directory *dir;
char *nwd;
nwd = canonical(wd, NULL);
dir = get_dir(nwd, force);
if (dir != NULL) {
free(ftp_lcwd);
ftp_lcwd = nwd;
free(status.remote.path);
status.remote.path = strdup(ftp_lcwd);
status_do(bs_remote);
}
else
free(nwd);
return dir;
}
void *
rftp_retr(char *file, int mode, off_t *startp, off_t *sizep)
{
int fd, resp;
char *dir, *name, *can, *p;
FILE *fin;
can = canonical(file, NULL);
dir = xdirname(can);
name = noalloc_basename(can);
if (ftp_mode(mode) == -1 || ftp_cwd(dir) == -1)
return NULL;
if ((fd=ftp_port()) == -1)
return NULL;
if (startp && *startp > 0) {
ftp_put("rest %lld", *startp);
if (ftp_resp() != 350)
*startp = 0;
}
ftp_put("retr %s", name);
if ((resp=ftp_resp()) != 150 && resp != 125) {
close(fd);
return NULL;
}
if (sizep) {
/* XXX: check how other servers format 150s */
if (strcmp(ftp_last_resp+strlen(ftp_last_resp)-8, " bytes).") == 0) {
if ((p=strrchr(ftp_last_resp, '(')) != NULL)
*sizep = strtoll(p+1, NULL, 10);
}
else
*sizep = -1;
}
if ((fin=ftp_accept(fd, "r")) == NULL) {
close(fd);
return NULL;
}
return fin;
}
void *
rftp_stor(char *file, int mode)
{
int fd, resp;
char *dir, *name, *can;
FILE *fin;
can = canonical(file, NULL);
dir = xdirname(can);
name = noalloc_basename(can);
if (ftp_mode(mode) == -1 || ftp_cwd(dir) == -1)
return NULL;
if ((fd=ftp_port()) == -1)
return NULL;
ftp_put("stor %s", name);
if ((resp=ftp_resp()) != 150 && resp != 125) {
close(fd);
return NULL;
}
if ((fin=ftp_accept(fd, "w")) == NULL) {
close(fd);
return NULL;
}
return fin;
}
int
rftp_fclose(void *f)
{
int err, resp;
err = fclose(f);
if (((resp=ftp_resp()) != 226 && resp != 250))
return -1;
return err;
}
int
rftp_mkdir(char *path)
{
ftp_put("mkd %s", path);
if (ftp_resp() != 257)
return -1;
return 0;
}
int
rftp_rmdir(char *path)
{
ftp_put("rmd %s", path);
if (ftp_resp() != 250)
return -1;
return 0;
}
int
rftp_deidle(void)
{
ftp_put("noop");
if (ftp_resp() != 200)
return -1;
return 0;
}
char *
rftp_pwd(void)
{
char *s, *e, *dir;
ftp_put("pwd");
if (ftp_resp() != 257)
return NULL;
if ((s=strchr(ftp_last_resp, '"')) == NULL
|| (e=strchr(s+1, '"')) == NULL)
return NULL;
if ((dir=(char *)malloc(e-s+1)) == NULL)
return NULL;
strncpy(dir, s+1, e-s-1);
dir[e-s-1] = '\0';
if (ftp_dosnames == -1) {
if ((isalpha(dir[0]) && dir[1] == ':' && dir[2] == '\\'))
ftp_dosnames = 1;
else if (dir[0] == '\\')
ftp_dosnames = 2;
else
ftp_dosnames = 0;
}
if (ftp_dosnames == 1 || ftp_dosnames == 2) {
if (ftp_dosnames == 1) {
strncpy(dir+1, s+1, e-s-1);
dir[e-s] = '\0';
dir[0] = '/';
}
for (s=dir; *s; s++)
if (*s == '\\')
*s = '/';
}
free(ftp_pcwd);
ftp_pcwd = strdup(dir);
return dir;
}
char *
ftp_gets(FILE *f)
{
char buf[8192], *line;
int l, l2;
if (fgets(buf, 8192, f) == NULL)
return NULL;
line = strdup(buf);
l = strlen(line);
while (line[l-1] != '\n') {
if (fgets(buf, 8192, f) == NULL) {
free(line);
return NULL;
}
l2 = strlen(buf);
if ((line=realloc(line, l+l2+1)) == NULL) {
disp_status(DISP_ERROR, "malloc failure");
return NULL;
}
strcpy(line+l, buf);
l += l2;
}
if (line[l-2] == '\r')
line[l-2] = '\0';
else
line[l-1] = '\0';
return line;
}
static int
ftp_put(char *fmt, ...)
{
char buf[8192];
va_list argp;
if (conout == NULL) {
disp_status(DISP_ERROR, "not connected");
return -1;
}
va_start(argp, fmt);
vsprintf(buf, fmt, argp);
va_end(argp);
if (strncmp(buf, "pass ", 5) == 0 && _ftp_anon == 0)
disp_status(DISP_PROTO, "-> pass ********");
else
disp_status(DISP_PROTO, "-> %s", buf);
fprintf(conout, "%s\r\n", buf);
if (fflush(conout) || ferror(conout)) {
disp_status(DISP_ERROR, "error writing to server: %s",
strerror(errno));
return -1;
}
return 0;
}
static int
ftp_abort(FILE *fin)
{
int resp;
char buf[4096];
fd_set ready;
struct timeval poll;
/* check wether abort is necessary (no data on control connection) */
poll.tv_sec = poll.tv_usec = 0;
FD_ZERO(&ready);
FD_SET(fileno(conin), &ready);
/* XXX: error ignored */
if (select(fileno(conin)+1, &ready, NULL, NULL, &poll) == 1)
return 0;
/* do abort */
disp_status(DISP_PROTO, "-> <attention>");
if (send(fileno(conout), "\377\364\377" /* IAC IP IAC */, 3,
MSG_OOB) != 3) {
disp_status(DISP_ERROR, "cannot send attention: %s",
strerror(errno));
return -1;
}
if (fputc('\362' /* DM */, conout) == EOF) {
disp_status(DISP_ERROR, "cannot send attention: %s",
strerror(errno));
return -1;
}
ftp_put("abor");
/* XXX: what about uploads? */
/* read remaining bytes from data connection */
while (fread(buf, 4096, 1, fin) > 0)
;
/* hanlde server response */
resp = ftp_resp();
if (resp == 226 || resp == 250) {
ftp_unresp(226);
sleep(1);
/* check wether 226 is for us */
poll.tv_sec = poll.tv_usec = 0;
FD_ZERO(&ready);
FD_SET(fileno(conin), &ready);
/* XXX: error ignored */
if (select(fileno(conin)+1, &ready, NULL, NULL, &poll) == 1)
ftp_resp();
return 0;
}
else if (resp == 426) {
resp = ftp_resp();
ftp_unresp(426);
disp_status(DISP_STATUS, "426 Transfer aborted.");
return (resp == 226 || resp == 250);
}
else
return 1;
}
static int
ftp_resp(void)
{
char *line;
int resp;
if (_ftp_keptresp != -1) {
resp = _ftp_keptresp;
_ftp_keptresp = -1;
return resp;
}
if (conin == NULL) {
disp_status(DISP_ERROR, "not connected");
return -1;
}
clearerr(conin);
if ((line=ftp_gets(conin)) == NULL) {
if (ferror(conin))
disp_status(DISP_ERROR, "read error from server: %s",
strerror(errno));
else
disp_status(DISP_ERROR, "connection to server lost");
return -1;
}
/* XXX: DISP_PROTO should be used for first line */
resp = atoi(line);
disp_status(DISP_STATUS, "%s", line);
free(ftp_last_resp);
ftp_last_resp = strdup(line);
while (!(isdigit(line[0]) && isdigit(line[1]) &&
isdigit(line[2]) && line[3] == ' ')) {
disp_status(DISP_HIST, "%s", line);
if ((line=ftp_gets(conin)) == NULL) {
disp_status(DISP_ERROR, "read error from server: %s",
strerror(errno));
return -1;
}
}
disp_status(DISP_HIST, "%s", line);
return resp;
}
static void
ftp_unresp(int resp)
{
_ftp_keptresp = resp;
}
static int
ftp_port(void)
{
int fd, port, val, i, delim;
int len;
unsigned int iaddr;
unsigned char addr[4];
char baddr[16], bport[6], *s, *e;
char *saddr, *sport;
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
struct sockaddr_storage sa;
#else
struct sockaddr sa;
#endif
struct sockaddr_in *sin;
if (!opt_pasv) {
sin = (struct sockaddr_in *)ftp_addr;
len = sizeof(sa);
if ((fd=spassive(ftp_addr->sa_family,
(struct sockaddr *)&sa, &len)) == -1)
return -1;
port = htons(((struct sockaddr_in *)&sa)->sin_port);
if (ftp_addr->sa_family == AF_INET) {
iaddr = htonl(sin->sin_addr.s_addr);
ftp_put("port %d,%d,%d,%d,%d,%d",
(iaddr>>24) & 0xff, (iaddr>>16) & 0xff,
(iaddr>>8) & 0xff, iaddr & 0xff,
(port>>8) & 0xff, port & 0xff);
}
else {
ftp_put("eprt |%d|%s|%d|",
/* proto no */ 2,
sockaddr_ntop(ftp_addr), port);
}
if (ftp_resp() != 200) {
close(fd);
return -1;
}
}
else {
if (ftp_addr->sa_family == AF_INET) {
ftp_put("pasv");
if (ftp_resp() != 227)
return -1;
if ((s=strchr(ftp_last_resp, ',')) == NULL)
return -1;
while (isdigit(*(--s)))
;
s++;
for (i=0; i<4; i++) {
val = strtol(s, &e, 10);
if (val < 0 || val > 255 || *e != ',')
return -1;
addr[i] = val;
s = e+1;
}
port = strtol(s, &e, 10);
if (port < 0 || port > 255 || *e != ',')
return -1;
s = e+1;
val = strtol(s, &e, 10);
if (val < 0 || val > 255)
return -1;
port = port*256+val;
sprintf(baddr, "%d.%d.%d.%d",
addr[0], addr[1], addr[2], addr[3]);
sprintf(bport, "%d", port);
saddr = baddr;
sport = bport;
}
else { /* inet 6 passive */
ftp_put("epsv");
if (ftp_resp() != 229)
return -1;
if ((s=strchr(ftp_last_resp, '(')) == NULL)
return -1;
delim = s[1];
if ((e=strchr(s+2, delim)) == NULL
|| (e=strchr(e+1, delim)) == NULL)
return -1;
s = e+1;
if ((e=strchr(s, delim)) == NULL)
return -1;
if (e-s>5)
return -1;
strncpy(bport, s, e-s);
bport[e-s] = '\0';
sport = bport;
saddr = _ftp_host;
}
fd = sopen(saddr, sport, ftp_addr->sa_family);
}
return fd;
}
static FILE *
ftp_accept(int fd, char *mode)
{
int len, ns;
struct sockaddr addr;
if (!opt_pasv) {
len = sizeof(addr);
if ((ns=accept(fd, &addr, &len)) == -1)
return NULL;
close(fd);
fd = ns;
}
fcntl(fd, F_SETFD, 1); /* XXX: error check */
return fdopen(fd, mode);
}
static int
ftp_mode(char m)
{
if (m == ftp_curmode)
return 0;
ftp_put("type %c", toupper(m));
if (ftp_resp() != 200)
return -1;
ftp_curmode = m;
return 0;
}
int
rftp_cwd(char *path)
{
char *s;
int off;
if (ftp_pcwd && strcmp(path, ftp_pcwd) == 0)
return 0;
if (ftp_dosnames == 1 || ftp_dosnames == 2) {
off = (ftp_dosnames == 1) ? 1 : 0;
for (s=path+off; *s; s++)
if (*s == '/')
*s = '\\';
ftp_put("cwd %s", path+off);
for (s=path+off; *s; s++)
if (*s == '\\')
*s = '/';
}
else
ftp_put("cwd %s", path);
if (ftp_resp() != 250)
return -1;
if (ftp_dosnames == -1) {
if ((s=strchr(ftp_last_resp, '"')) != NULL
&& strchr(s+1, '"') != NULL) {
if (isalpha(s[1]) && s[2] == ':' && s[3] == '\\')
ftp_dosnames = 1;
else if (s[1] == '\\')
ftp_dosnames = 2;
else
ftp_dosnames = 0;
}
else
ftp_dosnames = 0;
}
free(ftp_pcwd);
ftp_pcwd = strdup(path);
return 0;
}
int
ftp_cat(void *fin, void *fout, off_t start, off_t size, int upload)
{
char buf[4096], buf2[8192], *p;
int nread, nwritten, err, trail_cr, errno_copy;
enum { ERR_NONE, ERR_FIN, ERR_FOUT } error_cause;
int old_alarm;
off_t got;
struct itimerval itv;
struct _ftp_transfer_stats trstat;
int do_read;
int (*fn_read)(void *, size_t, void *);
int (*fn_write)(void *, size_t, void *);
int (*fn_eof)(void *);
got = start;
signal(SIGINT, sig_remember);
_ftp_transfer_stats_init(&trstat, start, size, 3);
old_alarm = sig_alarm = sig_intr = 0;
itv.it_value.tv_sec = itv.it_interval.tv_sec = 1;
itv.it_value.tv_usec = itv.it_interval.tv_usec = 0;
setitimer(ITIMER_REAL, &itv, NULL);
/* XXX: error check */
if (upload) {
/* fout is to server */
if (ftp_xfer_start(fout) < 0)
return -1;
fn_read = rftp_xfer_read;
fn_eof = rftp_xfer_eof;
fn_write = ftp_xfer_write;
rftp_xfer_start(fin);
}
else {
/* fin is from server */
if (ftp_xfer_start(fin) < 0)
return -1;
fn_read = ftp_xfer_read;
fn_eof = ftp_xfer_eof;
fn_write = rftp_xfer_write;
rftp_xfer_start(fout);
}
error_cause = ERR_NONE;
trail_cr = 0;
do_read = 1;