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/*++
/* NAME
/* find_inet 3
/* SUMMARY
/* inet-domain name services
/* SYNOPSIS
/* #include <find_inet.h>
/*
/* unsigned find_inet_addr(host)
/* const char *host;
/*
/* int find_inet_port(port, proto)
/* const char *port;
/* const char *proto;
/* DESCRIPTION
/* These functions translate network address information from
/* between printable form to the internal the form used by the
/* BSD TCP/IP network software.
/*
/* find_inet_addr() translates a symbolic or numerical hostname.
/* This function is deprecated. Use hostname_to_hostaddr() instead.
/*
/* find_inet_port() translates a symbolic or numerical port name.
/* BUGS
/* find_inet_addr() ignores all but the first address listed for
/* a symbolic hostname.
/* DIAGNOSTICS
/* Lookup and conversion errors are fatal.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
/* Application-specific. */
#include "msg.h"
#include "stringops.h"
#include "find_inet.h"
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
/* find_inet_addr - translate numerical or symbolic host name */
unsigned find_inet_addr(const char *host)
{
struct in_addr addr;
struct hostent *hp;
addr.s_addr = inet_addr(host);
if ((addr.s_addr == INADDR_NONE) || (addr.s_addr == 0)) {
if ((hp = gethostbyname(host)) == 0)
msg_fatal("host not found: %s", host);
if (hp->h_addrtype != AF_INET)
msg_fatal("unexpected address family: %d", hp->h_addrtype);
if (hp->h_length != sizeof(addr))
msg_fatal("unexpected address length %d", hp->h_length);
memcpy((void *) &addr, hp->h_addr, hp->h_length);
}
return (addr.s_addr);
}
/* find_inet_port - translate numerical or symbolic service name */
int find_inet_port(const char *service, const char *protocol)
{
struct servent *sp;
int port;
if (alldig(service) && (port = atoi(service)) != 0) {
if (port < 0 || port > 65535)
msg_fatal("bad port number: %s", service);
return (htons(port));
} else {
if ((sp = getservbyname(service, protocol)) == 0)
msg_fatal("unknown service: %s/%s", service, protocol);
return (sp->s_port);
}
}
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