/*
* netopen.c -- functions to make tcp/udp connections
*
* Chet Ramey
* chet@ins.CWRU.Edu
*/
/* Copyright (C) 1987-2002 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 3 of the License, 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. If not, see .
*/
#include
#if defined (HAVE_NETWORK)
#if defined (HAVE_UNISTD_H)
# include
#endif
#include
#include
#if defined (HAVE_SYS_SOCKET_H)
# include
#endif
#if defined (HAVE_NETINET_IN_H)
# include
#endif
#if defined (HAVE_NETDB_H)
# include
#endif
#if defined (HAVE_ARPA_INET_H)
# include
#endif
#include
#include
#include
#include
#include
#ifndef errno
extern int errno;
#endif
#if !defined (HAVE_INET_ATON)
extern int inet_aton __P((const char *, struct in_addr *));
#endif
#ifndef HAVE_GETADDRINFO
static int _getaddr __P((char *, struct in_addr *));
static int _getserv __P((char *, int, unsigned short *));
static int _netopen4 __P((char *, char *, int));
#else /* HAVE_GETADDRINFO */
static int _netopen6 __P((char *, char *, int));
#endif
static int _netopen __P((char *, char *, int));
#ifndef HAVE_GETADDRINFO
/* 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 (host[0] >= '0' && host[0] <= '9')
{
/* 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, proto, pp)
char *serv;
int proto;
unsigned short *pp;
{
intmax_t l;
unsigned short s;
if (legal_number (serv, &l))
{
s = (unsigned short)(l & 0xFFFF);
if (s != l)
return (0);
s = htons (s);
if (pp)
*pp = s;
return 1;
}
else
#if defined (HAVE_GETSERVBYNAME)
{
struct servent *se;
se = getservbyname (serv, (proto == 't') ? "tcp" : "udp");
if (se == 0)
return 0;
if (pp)
*pp = se->s_port; /* ports returned in network byte order */
return 1;
}
#else /* !HAVE_GETSERVBYNAME */
return 0;
#endif /* !HAVE_GETSERVBYNAME */
}
/*
* Open a TCP or UDP connection to HOST on port SERV. Uses the
* traditional BSD mechanisms. Returns the connected socket or -1 on error.
*/
static int
_netopen4(host, serv, typ)
char *host, *serv;
int typ;
{
struct in_addr ina;
struct sockaddr_in sin;
unsigned short p;
int s, e;
if (_getaddr(host, &ina) == 0)
{
internal_error (_("%s: host unknown"), host);
errno = EINVAL;
return -1;
}
if (_getserv(serv, typ, &p) == 0)
{
internal_error(_("%s: invalid service"), serv);
errno = EINVAL;
return -1;
}
memset ((char *)&sin, 0, 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)
{
e = errno;
sys_error("connect");
close(s);
errno = e;
return (-1);
}
return(s);
}
#endif /* ! HAVE_GETADDRINFO */
#ifdef HAVE_GETADDRINFO
/*
* Open a TCP or UDP connection to HOST on port SERV. Uses getaddrinfo(3)
* which provides support for IPv6. Returns the connected socket or -1
* on error.
*/
static int
_netopen6 (host, serv, typ)
char *host, *serv;
int typ;
{
int s, e;
struct addrinfo hints, *res, *res0;
int gerr;
memset ((char *)&hints, 0, sizeof (hints));
/* XXX -- if problems with IPv6, set to PF_INET for IPv4 only */
#ifdef DEBUG /* PF_INET is the one that works for me */
hints.ai_family = PF_INET;
#else
hints.ai_family = PF_UNSPEC;
#endif
hints.ai_socktype = (typ == 't') ? SOCK_STREAM : SOCK_DGRAM;
gerr = getaddrinfo (host, serv, &hints, &res0);
if (gerr)
{
if (gerr == EAI_SERVICE)
internal_error ("%s: %s", serv, gai_strerror (gerr));
else
internal_error ("%s: %s", host, gai_strerror (gerr));
errno = EINVAL;
return -1;
}
for (res = res0; res; res = res->ai_next)
{
if ((s = socket (res->ai_family, res->ai_socktype, res->ai_protocol)) < 0)
{
if (res->ai_next)
continue;
sys_error ("socket");
freeaddrinfo (res0);
return -1;
}
if (connect (s, res->ai_addr, res->ai_addrlen) < 0)
{
if (res->ai_next)
{
close (s);
continue;
}
e = errno;
sys_error ("connect");
close (s);
freeaddrinfo (res0);
errno = e;
return -1;
}
freeaddrinfo (res0);
break;
}
return s;
}
#endif /* HAVE_GETADDRINFO */
/*
* Open a TCP or UDP connection to HOST on port SERV. Uses getaddrinfo(3)
* if available, falling back to the traditional BSD mechanisms otherwise.
* Returns the connected socket or -1 on error.
*/
static int
_netopen(host, serv, typ)
char *host, *serv;
int typ;
{
#ifdef HAVE_GETADDRINFO
return (_netopen6 (host, serv, typ));
#else
return (_netopen4 (host, serv, typ));
#endif
}
/*
* 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 = (char *)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 */