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/* Connection initiation
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <ftpconn.h>
#include "priv.h"
static error_t
ftp_conn_login (struct ftp_conn *conn)
{
int reply;
error_t err = 0;
const struct ftp_conn_params *p = conn->params;
err = ftp_conn_cmd (conn, "user", p->user ?: "anonymous", &reply, 0);
if (!err && reply == REPLY_NEED_ACCT)
{
char *acct = p->acct;
if (!acct && conn->hooks && conn->hooks->get_login_param)
err = (* conn->hooks->get_login_param) (conn,
FTP_CONN_GET_LOGIN_PARAM_ACCT,
&acct);
if (! err)
err = acct ? ftp_conn_cmd (conn, "acct", acct, &reply, 0) : EACCES;
if (acct && !p->acct)
free (acct);
}
if (!err && reply == REPLY_NEED_PASS)
{
char *pass = p->pass;
if (!pass && conn->hooks && conn->hooks->get_login_param)
err = (* conn->hooks->get_login_param) (conn,
FTP_CONN_GET_LOGIN_PARAM_PASS,
&pass);
if (! err)
{
if (pass)
err = ftp_conn_cmd (conn, "pass", pass, &reply, 0);
else
{
pass = getenv ("USER");
if (! pass)
pass = getenv ("LOGNAME");
if (! pass)
{
struct passwd *pe = getpwuid (getuid ());
pass = pe ? pe->pw_name : "?";
}
/* Append a '@' */
pass = strdup (pass);
if (pass)
pass = realloc (pass, strlen (pass) + 1);
if (pass)
{
strcat (pass, "@");
err = ftp_conn_cmd (conn, "pass", pass, &reply, 0);
}
else
err = ENOMEM;
}
}
if (pass && !p->pass)
free (pass);
}
if (!err && reply != REPLY_LOGIN_OK)
{
if (REPLY_IS_FAILURE (reply))
err = EACCES;
else
err = unexpected_reply (conn, reply, 0, 0);
}
return err;
}
static error_t
ftp_conn_hello (struct ftp_conn *conn)
{
int reply;
error_t err;
do
err = ftp_conn_get_reply (conn, &reply, 0);
while (!err && reply == REPLY_DELAY);
if (err)
return err;
if (reply == REPLY_CLOSED)
return ECONNREFUSED;
if (reply != REPLY_HELLO)
return EGRATUITOUS;
return 0;
}
/* Sets CONN's syshooks to a copy of SYSHOOKS. */
void
ftp_conn_set_syshooks (struct ftp_conn *conn, struct ftp_conn_syshooks *syshooks)
{
conn->syshooks = *syshooks;
}
void
ftp_conn_choose_syshooks (struct ftp_conn *conn, const char *syst)
{
if (!syst || (strncasecmp (syst, "UNIX", 4) == 0 && !isalnum (syst[4])))
ftp_conn_set_syshooks (conn, &ftp_conn_unix_syshooks);
}
/* Sets CONN's syshooks by querying the remote system to see what type it is. */
static error_t
ftp_conn_sysify (struct ftp_conn *conn)
{
int reply;
const char *txt;
error_t err = ftp_conn_cmd (conn, "syst", 0, &reply, &txt);
if (! err)
{
if (reply == REPLY_SYSTYPE ||
reply == REPLY_BAD_CMD || reply == REPLY_UNIMP_CMD || REPLY_NO_LOGIN)
{
if (reply == REPLY_BAD_CMD || reply == REPLY_UNIMP_CMD
|| reply == REPLY_NO_LOGIN)
txt = 0;
if (conn->hooks && conn->hooks->choose_syshooks)
(*conn->hooks->choose_syshooks) (conn, txt);
else
ftp_conn_choose_syshooks (conn, txt);
conn->syshooks_valid = 1;
}
else
err = unexpected_reply (conn, reply, txt, 0);
}
return err;
}
error_t
ftp_conn_open (struct ftp_conn *conn)
{
static int ftp_port = 0;
int csock;
error_t err;
struct sockaddr_in ftp_addr;
if (conn->params->addr_type != AF_INET)
return EAFNOSUPPORT;
if (! ftp_port)
{
struct servent *se = getservbyname ("ftp", "tcp");
if (! se)
return EGRATUITOUS;
ftp_port = se->s_port;
}
if (conn->control >= 0)
{
close (conn->control);
conn->control = -1;
}
memset (&conn->syshooks, 0, sizeof conn->syshooks);
csock = socket (PF_INET, SOCK_STREAM, 0);
if (csock < 0)
return errno;
ftp_addr.sin_len = sizeof ftp_addr;
ftp_addr.sin_family = conn->params->addr_type;
ftp_addr.sin_addr = *(struct in_addr *)conn->params->addr;
ftp_addr.sin_port = ftp_port;
if (connect (csock, (struct sockaddr *)&ftp_addr, sizeof ftp_addr) < 0)
{
err = errno;
close (csock);
return err;
}
conn->control = csock;
err = ftp_conn_hello (conn);
if (!err && conn->hooks && conn->hooks->opened)
(* conn->hooks->opened) (conn);
if (! err)
/* Make any machine-dependent customizations. */
ftp_conn_sysify (conn);
if (! err)
/* login */
err = ftp_conn_login (conn);
if (!err && !conn->syshooks_valid)
/* Try again now. */
err = ftp_conn_sysify (conn);
if (!err && conn->type)
/* Set the connection type. */
{
int reply;
err = ftp_conn_cmd (conn, "type", conn->type, &reply, 0);
if (!err && reply != REPLY_OK)
err = unexpected_reply (conn, reply, 0, 0);
}
if (err)
ftp_conn_close (conn);
return err;
}
void
ftp_conn_close (struct ftp_conn *conn)
{
if (conn->control >= 0)
close (conn->control);
conn->control = -1;
if (conn->hooks && conn->hooks->closed)
(* conn->hooks->closed) (conn);
}
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