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/*
* Copyright (c) 1999-2003 Smithsonian Astrophysical Observatory
*/
/*
*
* tcp.c -- unix tcp connection routines
*
*/
#if HAVE_CONFIG_H
#include <conf.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <xport.h>
#include <tcp.h>
/* the ever-present */
#ifndef SZ_LINE
#define SZ_LINE 1024
#endif
/* name of user environment variable specifying this host */
#ifndef MYHOST
#define MYHOST "XPA_HOST"
#endif
/* other modules can set this variable and the default for various routines
will be "localhost" instead of the DNS-dependent hostname */
int use_localhost=0;
static char myhost[SZ_LINE]; /* hostname to registering access points */
/*
*----------------------------------------------------------------------------
*
*
* Private Routines and Data
*
*
*----------------------------------------------------------------------------
*/
static char ipstr[SZ_LINE];
/*
*----------------------------------------------------------------------------
*
*
* Public Routines
*
*
*----------------------------------------------------------------------------
*/
/*
*--------------------------------------------------------------
*
* Routines: gethost
*
* Purpose: Find the current hostname
*
* Results: 1 on success, 0 for failure
*
*--------------------------------------------------------------
*/
#ifdef ANSI_FUNC
int
gethost (
char *xhost, /* (out) corresponding hostname */
int len /* (in) length of host buffer */
)
#else
int gethost(xhost, len)
char *xhost; /* (out) corresponding hostname */
int len; /* (in) length of host buffer */
#endif
{
char *s=NULL;
struct hostent *hent;
static int init=0;
if( use_localhost == 0 ){
if( init == 0 ){
if( (s=(char *)getenv(MYHOST)) != NULL ){
strncpy(myhost, s, SZ_LINE-1);
} else {
gethostname(myhost, SZ_LINE-1);
}
init++;
}
strncpy(xhost, myhost, len-1);
if( (hent = gethostbyname(xhost)) == NULL ){
return(-1);
}
strncpy(xhost, hent->h_name, len-1);
}
else{
strncpy(xhost, "localhost", len-1);
}
xhost[len-1] = '\0';
return(0);
}
/*
*----------------------------------------------------------------------------
*
* Routine: gethostip
*
* Purpose: Find the IP address corresponding to a hostname
*
* Results: ip (host byte order) on success, 0 if host is unknown
*
*---------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
unsigned int
gethostip (
char *xhost /* (in) Hostname (human readable) */
)
#else
unsigned int gethostip(xhost)
char *xhost; /* (in) Hostname (human readable) */
#endif
{
struct hostent *hostent;
unsigned int ip;
char temp[SZ_LINE];
int saveip=0;
static unsigned int myip=0;
/* null input means current host */
if( (xhost == NULL) || (*xhost == '\0') || !strcmp(xhost, "$host") ){
if( myip != 0 )
return(myip);
saveip = 1;
gethost(temp, SZ_LINE);
}
else if( !strcmp(xhost, "$localhost") ){
strcpy(temp, "localhost");
} else {
strncpy(temp, xhost, SZ_LINE-1);
temp[SZ_LINE-1] = '\0';
}
/* special check */
if( !strcmp(temp, "localhost") || !strcmp(temp, "localhost.localdomain") ){
ip = htonl(0x7F000001);
goto done;
}
/*
* Try looking by address (i.e., host is something like "128.84.253.1").
* Do this first because it's much faster (no trip to the DNS)
*/
if( (int)(ip = inet_addr(temp)) != -1 ){
goto done;
}
/*
* Try looking it up by name. If successful, the IP address is in
* hostent->h_addr_list[0]
*/
if( (hostent = gethostbyname(temp)) != NULL ){
memcpy(&ip, hostent->h_addr_list[0], (size_t)hostent->h_length);
goto done;
}
/* could not convert */
ip = 0;
saveip = 0;
done:
ip = ntohl(ip);
if( saveip ) myip = ip;
return(ip);
}
/*
*----------------------------------------------------------------------------
*
* Routine: getiphost
*
* Purpose: Find the IP address in dot format corresponding to an ip
*
* Results: ip string (in static buffer) or NULL
*
*---------------------------------------------------------------------------
*/
#ifdef ANSI_FUNC
char *
getiphost (unsigned int ip)
#else
char *getiphost(ip)
unsigned int ip;
#endif
{
char *s;
struct sockaddr_in sockbuf;
if( ip == 0x7F000001 ){
strcpy(ipstr, "localhost");
return(ipstr);
}
sockbuf.sin_addr.s_addr = htonl(ip);
s = (char *)inet_ntoa(sockbuf.sin_addr);
if( s != NULL ){
strcpy(ipstr, s);
return(ipstr);
}
else
return(NULL);
}
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