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/*-
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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 AUTHOR ``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 AUTHOR 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.
*
* $Id$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include "fetch.h"
#include "common.h"
/*** Local data **************************************************************/
/*
* Error messages for resolver errors
*/
static struct fetcherr _netdb_errlist[] = {
{ HOST_NOT_FOUND, "Host not found" },
{ TRY_AGAIN, "Transient resolver failure" },
{ NO_RECOVERY, "Non-recoverable resolver failure" },
{ NO_DATA, "No address record" },
{ -1, "Unknown resolver error" }
};
#define _netdb_errstring(n) _fetch_errstring(_netdb_errlist, n)
#define _netdb_seterr(n) _fetch_seterr(_netdb_errlist, n)
/*** Error-reporting functions ***********************************************/
/*
* Map error code to string
*/
const char *
_fetch_errstring(struct fetcherr *p, int e)
{
while ((p->num != -1) && (p->num != e))
p++;
return p->string;
}
/*
* Set error code
*/
void
_fetch_seterr(struct fetcherr *p, int e)
{
fetchLastErrCode = e;
fetchLastErrText = _fetch_errstring(p, e);
}
/*
* Set error code according to errno
*/
void
_fetch_syserr(void)
{
fetchLastErrCode = errno;
fetchLastErrText = strerror(errno);
}
/*** Network-related utility functions ***************************************/
/*
* Establish a TCP connection to the specified port on the specified host.
*/
int
fetchConnect(char *host, int port)
{
struct sockaddr_in sin;
struct hostent *he;
int sd;
#ifndef NDEBUG
fprintf(stderr, "\033[1m---> %s:%d\033[m\n", host, port);
#endif
/* look up host name */
if ((he = gethostbyname(host)) == NULL) {
_netdb_seterr(h_errno);
return -1;
}
/* set up socket address structure */
bzero(&sin, sizeof(sin));
bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length);
sin.sin_family = he->h_addrtype;
sin.sin_port = htons(port);
/* try to connect */
if ((sd = socket(sin.sin_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
_fetch_syserr();
return -1;
}
if (connect(sd, (struct sockaddr *)&sin, sizeof sin) == -1) {
_fetch_syserr();
close(sd);
return -1;
}
return sd;
}
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