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/*
* netopen.c -- functions to make tcp/udp connections
*
* Chet Ramey
* chet@ins.CWRU.Edu
*/
/* Copyright (C) 1987,1991 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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.
Bash 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 Bash; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <config.h>
#if defined (HAVE_NETWORK)
#include <stdio.h>
#include <sys/types.h>
#if defined (HAVE_SYS_SOCKET_H)
# include <sys/socket.h>
#endif
#if defined (HAVE_NETINET_IN_H)
# include <netinet/in.h>
#endif
#if defined (HAVE_NETDB_H)
# include <netdb.h>
#endif
#if defined (HAVE_ARPA_INET_H)
# include <arpa/inet.h>
#endif
#include <bashansi.h>
#include <ctype.h>
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#if !defined (HAVE_INET_ATON)
extern int inet_aton ();
#endif
extern char *xmalloc ();
/* Stuff the internet address corresponding to HOST into AP, in network
byte order. Return 1 on success, 0 on failure. */
static int
_getaddr (host, ap)
char *host;
struct in_addr *ap;
{
struct hostent *h;
int r;
r = 0;
if (isdigit (host[0]))
{
/* If the first character is a digit, guess that it's an
Internet address and return immediately if inet_aton succeeds. */
r = inet_aton (host, ap);
if (r)
return r;
}
#if !defined (HAVE_GETHOSTBYNAME)
return 0;
#else
h = gethostbyname (host);
if (h && h->h_addr)
{
bcopy(h->h_addr, (char *)ap, h->h_length);
return 1;
}
#endif
return 0;
}
/* Return 1 if SERV is a valid port number and stuff the converted value into
PP in network byte order. */
static int
_getserv (serv, pp)
char *serv;
unsigned short *pp;
{
long l;
unsigned short s;
if (legal_number (serv, &l))
{
if (l > 65535)
return 0;
s = (unsigned short)(l & 0xFFFF);
s = htons (s);
if (pp)
*pp = s;
return 1;
}
else
return 0;
}
static int
_netopen(host, serv, typ)
char *host, *serv;
int typ;
{
struct in_addr ina;
struct sockaddr_in sin;
unsigned short p;
int s;
char **cp;
if (_getaddr(host, &ina) == 0)
{
internal_error ("%s: host unknown", host);
return -1;
}
if (_getserv(serv, &p) == 0)
{
internal_error("%s: invalid service", serv);
return -1;
}
bzero ((char *)&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = p;
sin.sin_addr = ina;
s = socket(AF_INET, (typ == 't') ? SOCK_STREAM : SOCK_DGRAM, 0);
if (s < 0)
{
sys_error ("socket");
return (-1);
}
if (connect (s, (struct sockaddr *)&sin, sizeof (sin)) < 0)
{
sys_error("connect");
close(s);
return (-1);
}
return(s);
}
/*
* Open a TCP or UDP connection given a path like `/dev/tcp/host/port' to
* host `host' on port `port' and return the connected socket.
*/
int
netopen (path)
char *path;
{
char *np, *s, *t;
int fd;
np = xmalloc (strlen (path) + 1);
strcpy (np, path);
s = np + 9;
t = strchr (s, '/');
if (t == 0)
{
internal_error ("%s: bad network path specification", path);
return -1;
}
*t++ = '\0';
fd = _netopen (s, t, path[5]);
free (np);
return fd;
}
#if 0
/*
* Open a TCP connection to host `host' on the port defined for service
* `serv' and return the connected socket.
*/
int
tcpopen (host, serv)
char *host, *serv;
{
return (_netopen (host, serv, 't'));
}
/*
* Open a UDP connection to host `host' on the port defined for service
* `serv' and return the connected socket.
*/
int
udpopen (host, serv)
char *host, *serv;
{
return _netopen (host, serv, 'u');
}
#endif
#else /* !HAVE_NETWORK */
int
netopen (path)
char *path;
{
internal_error ("network operations not supported");
return -1;
}
#endif /* !HAVE_NETWORK */
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