135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*-
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* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <netdb.h>
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#include <string.h>
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#include <unistd.h>
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#include "fetch.h"
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#include "common.h"
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/*** Local data **************************************************************/
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/*
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* Error messages for resolver errors
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*/
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static struct fetcherr _netdb_errlist[] = {
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{ HOST_NOT_FOUND, "Host not found" },
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{ TRY_AGAIN, "Transient resolver failure" },
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{ NO_RECOVERY, "Non-recoverable resolver failure" },
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{ NO_DATA, "No address record" },
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{ -1, "Unknown resolver error" }
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};
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#define _netdb_errstring(n) _fetch_errstring(_netdb_errlist, n)
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#define _netdb_seterr(n) _fetch_seterr(_netdb_errlist, n)
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/*** Error-reporting functions ***********************************************/
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/*
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* Map error code to string
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*/
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const char *
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_fetch_errstring(struct fetcherr *p, int e)
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{
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while ((p->num != -1) && (p->num != e))
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p++;
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return p->string;
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}
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/*
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* Set error code
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*/
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void
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_fetch_seterr(struct fetcherr *p, int e)
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{
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fetchLastErrCode = e;
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fetchLastErrText = _fetch_errstring(p, e);
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}
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/*
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* Set error code according to errno
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*/
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void
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_fetch_syserr(void)
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{
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fetchLastErrCode = errno;
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fetchLastErrText = strerror(errno);
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}
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/*** Network-related utility functions ***************************************/
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/*
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* Establish a TCP connection to the specified port on the specified host.
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*/
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int
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fetchConnect(char *host, int port)
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{
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struct sockaddr_in sin;
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struct hostent *he;
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int sd;
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#ifndef NDEBUG
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fprintf(stderr, "\033[1m---> %s:%d\033[m\n", host, port);
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#endif
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/* look up host name */
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if ((he = gethostbyname(host)) == NULL) {
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_netdb_seterr(h_errno);
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return -1;
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}
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/* set up socket address structure */
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bzero(&sin, sizeof(sin));
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bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length);
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sin.sin_family = he->h_addrtype;
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sin.sin_port = htons(port);
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/* try to connect */
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if ((sd = socket(sin.sin_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
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_fetch_syserr();
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return -1;
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}
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if (connect(sd, (struct sockaddr *)&sin, sizeof sin) == -1) {
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_fetch_syserr();
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close(sd);
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return -1;
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}
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return sd;
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}
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