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/* Server lookup
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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.
The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <ftpconn.h>
/* Split the server-specification string SERVER into its components: a
hostname (returned in HOST), username (USER), and password (PASSWD). */
static error_t
split_server_name (const char *server, char **host, char **user, char **passwd)
{
size_t plim;
const char *p = server, *sep;
*host = 0;
*user = 0;
*passwd = 0;
/* Extract the hostname; syntax is either `HOST:...', `...@HOST', or just
HOST if there are no user parameters specified. */
sep = strrchr (p, '@');
if (sep)
/* ...@HOST */
{
*host = strdup (sep + 1);
if (! *host)
return ENOMEM;
plim = sep - server;
}
else
{
sep = strchr (server, ':');
if (sep)
/* HOST:... */
{
*host = strndup (server, sep - server);
if (! *host)
return ENOMEM;
p = sep + 1;
plim = strlen (p);
}
else
/* Just HOST */
{
*host = strdup (server);
if (! *host)
return ENOMEM;
return 0;
}
}
/* Now P...P+PLIM contains any user parameters for HOST. */
sep = memchr (p, ':', plim);
if (sep)
/* USERNAME:PASSWD */
{
*user = strndup (p, sep - p);
*passwd = strndup (sep + 1, plim - (sep + 1 - p));
if (!*user || !*passwd)
{
if (*user)
free (*user);
if (*passwd)
free (*passwd);
free (*host);
return ENOMEM;
}
}
else
/* Just USERNAME */
{
*user = strndup (p, plim);
if (! *user)
free (*user);
}
return 0;
}
/* */
error_t
lookup_server (const char *server, struct ftp_conn_params **params, int *h_err)
{
char hostent_data[2048]; /* XXX what size should this be???? */
struct hostent _he, *he;
char *host, *user, *passwd;
error_t err = split_server_name (server, &host, &user, &passwd);
if (err)
return err;
/* We didn't find a pre-existing host entry. Make a new one. Note that
since we don't lock anything while making up our new structure, another
thread could have inserted a duplicate entry for the same host name, but
this isn't really a problem, just annoying. */
if (gethostbyname_r (host, &_he, hostent_data, sizeof hostent_data,
&he, h_err) == 0)
{
*params = malloc (sizeof (struct ftp_conn_params));
if (! *params)
err = ENOMEM;
else
{
(*params)->addr = malloc (he->h_length);
if (! (*params)->addr)
{
free (*params);
err = ENOMEM;
}
else
{
bcopy (he->h_addr_list[0], (*params)->addr, he->h_length);
(*params)->addr_len = he->h_length;
(*params)->addr_type = he->h_addrtype;
(*params)->user = user;
(*params)->pass = passwd;
(*params)->acct = 0;
}
}
}
else
err = EINVAL;
free (host);
if (err)
{
free (user);
free (passwd);
}
return err;
}
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