125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
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/*
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* generic/dpSock.c --
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*
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* This file implements the socket code for various channel drivers.
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* In other words, platforms that support Berkeley sockets can use routines
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* in this module as part of their platform specific driver.
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* This code is supported by the routines in the file dpSock.c in the
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* platform directories (i.e., win/dpSock.c, unix/dpSock.c, mac/dpSock.c)
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* which handle platform-specific error translation and other non-portable
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* functions.
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*
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* Copyright (c) 1995-1996 Cornell University.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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*/
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#include "generic/dpInt.h"
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#include "generic/dpPort.h"
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/*
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*--------------------------------------------------------------
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*
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* DpHostToIpAddr --
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*
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* Find the IP address corresponding to a hostname.
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*
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* Results:
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* 1 on success, 0 if host is unknown
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*
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* Side effects:
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* None
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*
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*--------------------------------------------------------------
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*/
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int
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DpHostToIpAddr (host, ipAddrPtr)
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char *host; /* (in) Hostname (human readable) */
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int *ipAddrPtr; /* (out) IP address of host */
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{
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struct hostent *hostent;
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if (strcmp (host, "localhost") == 0) {
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*ipAddrPtr = 0x7F000001;
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return 1;
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}
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/*
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* Gotta watch this one -- on NT, gethostbyname on "" goes out
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* to lunch
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*/
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if ((host == NULL) || (host[0] == 0)) {
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return 0;
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}
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/*
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* Try looking host up by address (i.e., host is something
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* like "128.84.253.1"). Since the value is returned in
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* network byte order, we change it to host byte order.
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* We do this first because it's much faster (doesn't require
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* a trip to the DNS).
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*/
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*ipAddrPtr = inet_addr(host);
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if (*ipAddrPtr != DP_INADDR_NONE) {
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*ipAddrPtr = ntohl(*ipAddrPtr);
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return 1;
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}
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/*
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* Looking up the host by address failed. Try looking it up by
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* name. If successful, the IP address is in network byte order
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* in hostent->h_addr_list[0]
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*/
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hostent = gethostbyname(host);
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if (hostent != NULL) {
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memcpy ((char *)ipAddrPtr,
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(char *) hostent->h_addr_list[0],
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(size_t) hostent->h_length);
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*ipAddrPtr = ntohl(*ipAddrPtr);
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return 1;
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}
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/*
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* Total failure
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*/
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return 0;
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}
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/*
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*--------------------------------------------------------------
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*
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* DpIpAddrToHost --
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*
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* Find the hostname corresponding to an IP address
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*
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* Results:
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* 1 on success, 0 for failure
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*
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* Side effects:
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* None
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*
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*--------------------------------------------------------------
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*/
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int
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DpIpAddrToHost (ipAddr, hostPtr)
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int ipAddr; /* (in) IP addr */
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char *hostPtr; /* (out) Corresponding hostname */
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{
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struct hostent *hEnt;
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if (ipAddr == 0x7F000001) {
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strcpy(hostPtr, "localhost");
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} else {
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hEnt = gethostbyaddr((char *)&ipAddr, sizeof(int), AF_INET);
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if (hEnt == NULL) {
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return 0;
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}
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strcpy(hostPtr, hEnt->h_name);
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}
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return 1;
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}
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