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1 /*
2  * $Id: ip_util.c,v 1.1 2004/11/14 07:26:26 paulus Exp $
3  *
4  * Copyright (C) 1995,1996,1997 Lars Fenneberg
5  *
6  * Copyright 1992 Livingston Enterprises, Inc.
7  *
8  * Copyright 1992,1993, 1994,1995 The Regents of the University of Michigan
9  * and Merit Network, Inc. All Rights Reserved
10  *
11  * See the file COPYRIGHT for the respective terms and conditions.
12  * If the file is missing contact me at lf@elemental.net
13  * and I'll send you a copy.
14  *
15  */
16 
17 #include <includes.h>
18 #include <radiusclient.h>
19 
20 /*
21  * Function: rc_get_ipaddr
22  *
23  * Purpose: return an IP address in host long notation from a host
24  *          name or address in dot notation.
25  *
26  * Returns: 0 on failure
27  */
28 
rc_get_ipaddr(char * host)29 UINT4 rc_get_ipaddr (char *host)
30 {
31 	struct hostent *hp;
32 
33 	if (rc_good_ipaddr (host) == 0)
34 	{
35 		return ntohl(inet_addr (host));
36 	}
37 	else if ((hp = gethostbyname (host)) == (struct hostent *) NULL)
38 	{
39 		error("rc_get_ipaddr: couldn't resolve hostname: %s", host);
40 		return ((UINT4) 0);
41 	}
42 	return ntohl((*(UINT4 *) hp->h_addr));
43 }
44 
45 /*
46  * Function: rc_good_ipaddr
47  *
48  * Purpose: check for valid IP address in standard dot notation.
49  *
50  * Returns: 0 on success, -1 when failure
51  *
52  */
53 
rc_good_ipaddr(char * addr)54 int rc_good_ipaddr (char *addr)
55 {
56 	int             dot_count;
57 	int             digit_count;
58 
59 	if (addr == NULL)
60 		return (-1);
61 
62 	dot_count = 0;
63 	digit_count = 0;
64 	while (*addr != '\0' && *addr != ' ')
65 	{
66 		if (*addr == '.')
67 		{
68 			dot_count++;
69 			digit_count = 0;
70 		}
71 		else if (!isdigit (*addr))
72 		{
73 			dot_count = 5;
74 		}
75 		else
76 		{
77 			digit_count++;
78 			if (digit_count > 3)
79 			{
80 				dot_count = 5;
81 			}
82 		}
83 		addr++;
84 	}
85 	if (dot_count != 3)
86 	{
87 		return (-1);
88 	}
89 	else
90 	{
91 		return (0);
92 	}
93 }
94 
95 /*
96  * Function: rc_ip_hostname
97  *
98  * Purpose: Return a printable host name (or IP address in dot notation)
99  *	    for the supplied IP address.
100  *
101  */
102 
rc_ip_hostname(UINT4 h_ipaddr)103 const char *rc_ip_hostname (UINT4 h_ipaddr)
104 {
105 	struct hostent  *hp;
106 	UINT4           n_ipaddr = htonl (h_ipaddr);
107 
108 	if ((hp = gethostbyaddr ((char *) &n_ipaddr, sizeof (struct in_addr),
109 			    AF_INET)) == NULL) {
110 		error("rc_ip_hostname: couldn't look up host by addr: %08lX", h_ipaddr);
111 	}
112 
113 	return ((hp==NULL)?"unknown":hp->h_name);
114 }
115 
116 /*
117  * Function: rc_own_ipaddress
118  *
119  * Purpose: get the IP address of this host in host order
120  *
121  * Returns: IP address on success, 0 on failure
122  *
123  */
124 
rc_own_ipaddress(void)125 UINT4 rc_own_ipaddress(void)
126 {
127 	static UINT4 this_host_ipaddr = 0;
128 
129 	if (!this_host_ipaddr) {
130 		if ((this_host_ipaddr = rc_get_ipaddr (hostname)) == 0) {
131 			error("rc_own_ipaddress: couldn't get own IP address");
132 			return 0;
133 		}
134 	}
135 
136 	return this_host_ipaddr;
137 }
138 
139 /*
140  * Function: rc_own_bind_ipaddress
141  *
142  * Purpose: get the IP address to be used as a source address
143  *          for sending requests in host order
144  *
145  * Returns: IP address
146  *
147  */
148 
rc_own_bind_ipaddress(void)149 UINT4 rc_own_bind_ipaddress(void)
150 {
151 	char *bindaddr;
152 	UINT4 rval = 0;
153 
154 	if ((bindaddr = rc_conf_str("bindaddr")) == NULL ||
155 	    strcmp(rc_conf_str("bindaddr"), "*") == 0) {
156 		rval = INADDR_ANY;
157 	} else {
158 		if ((rval = rc_get_ipaddr(bindaddr)) == 0) {
159 			error("rc_own_bind_ipaddress: couldn't get IP address from bindaddr");
160 			rval = INADDR_ANY;
161 		}
162 	}
163 
164 	return rval;
165 }
166