ircd-hybrid/src/irc_getnameinfo.c

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Issues to be discussed:
 * - Thread safe-ness must be checked
 * - RFC2553 says that we should raise error on short buffer.  X/Open says
 *   we need to truncate the result.  We obey RFC2553 (and X/Open should be
 *   modified).  ipngwg rough consensus seems to follow RFC2553.
 * - What is "local" in NI_FQDN?
 * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
 * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
 *   sin6_scope_id is filled - standardization status?
 *   XXX breaks backward compat for code that expects no scopeid.
 *   beware on merge.
 */

#include "stdinc.h"

#include "irc_getnameinfo.h"
#include "irc_string.h"

/*  $Id: irc_getnameinfo.c,v 7.12 2003/12/20 23:01:57 metalrock Exp $ */

static const struct afd {
  int a_af;
  int a_addrlen;
  socklen_t a_socklen;
  int a_off;
} afdl [] = {
#ifdef IPV6
    {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
             offsetof(struct sockaddr_in6, sin6_addr)},
#endif
    {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
            offsetof(struct sockaddr_in, sin_addr)},
    {0, 0, 0, 0},
};

struct sockinet
{
  unsigned char si_len;
  unsigned char si_family;
  unsigned short si_port;
};

#ifdef IPV6
static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
    size_t, int);
#endif

int
irc_getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
                size_t hostlen, char *serv, size_t servlen, int flags)
{
  const struct afd *afd;
  struct servent *sp;
  unsigned short port;
  int family, i;
  const char *addr;
  u_int32_t v4a;
  char numserv[512];
  char numaddr[512];

  if (sa == NULL)
    return EAI_FAIL;

/*      if (sa->sa_len != salen)
                return EAI_FAIL;
*/
        family = sa->sa_family;
        for (i = 0; afdl[i].a_af; i++)
                if (afdl[i].a_af == family) {
                        afd = &afdl[i];
                        goto found;
                }
        return EAI_FAMILY;

 found:
        if (salen != afd->a_socklen)
                return EAI_FAIL;

        /* network byte order */
        port = ((const struct sockinet *)sa)->si_port;
        addr = (const char *)sa + afd->a_off;

        if (serv == NULL || servlen == 0) {
                /*
                 * do nothing in this case.
                 * in case you are wondering if "&&" is more correct than
                 * "||" here: rfc2553bis-03 says that serv == NULL OR
                 * servlen == 0 means that the caller does not want the result.
                 */
        } else {
                if (flags & NI_NUMERICSERV)
                        sp = NULL;
                else {
                        sp = getservbyport(port,
                                (flags & NI_DGRAM) ? "udp" : "tcp");
                }
                if (sp) {
                        if (strlen(sp->s_name) + 1 > servlen)
                                return EAI_MEMORY;
                        strlcpy(serv, sp->s_name, servlen);
                } else {
                        snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
                        if (strlen(numserv) + 1 > servlen)
                                return EAI_MEMORY;
                        strlcpy(serv, numserv, servlen);
                }
        }

        switch (sa->sa_family) {
        case AF_INET:
                v4a = (u_int32_t)
                    ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
                if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
                        flags |= NI_NUMERICHOST;
                v4a >>= IN_CLASSA_NSHIFT;
                if (v4a == 0)
                        flags |= NI_NUMERICHOST;                        
                break;
#ifdef IPV6
        case AF_INET6:
            {
                const struct sockaddr_in6 *sin6;
                sin6 = (const struct sockaddr_in6 *)sa;
                switch (sin6->sin6_addr.s6_addr[0]) {
                case 0x00:
                        if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
                                ;
                        else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
                                ;
                        else
                                flags |= NI_NUMERICHOST;
                        break;
                default:
                        if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                flags |= NI_NUMERICHOST;
                        }
                        else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
                                flags |= NI_NUMERICHOST;
                        break;
                }
            }
                break;
#endif
        }
        if (host == NULL || hostlen == 0) {
                /*
                 * do nothing in this case.
                 * in case you are wondering if "&&" is more correct than
                 * "||" here: rfc2553bis-03 says that host == NULL or
                 * hostlen == 0 means that the caller does not want the result.
                 */
        } else if (flags & NI_NUMERICHOST) {
                size_t numaddrlen;

                /* NUMERICHOST and NAMEREQD conflicts with each other */
                if (flags & NI_NAMEREQD)
                        return EAI_NONAME;

                switch(afd->a_af) {
#ifdef IPV6
                case AF_INET6:
                {
                        int error;

                        if ((error = ip6_parsenumeric(sa, addr, host,
                                                      hostlen, flags)) != 0)
                                return(error);
                        break;
                }
#endif
                default:
                        if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
                            == NULL)
                                return EAI_SYSTEM;
                        numaddrlen = strlen(numaddr);
                        if (numaddrlen + 1 > hostlen) /* don't forget terminator */
                                return EAI_MEMORY;
                        strlcpy(host, numaddr, hostlen);
                        break;
                }
        }
        return(0);
}

#ifdef IPV6
static int
ip6_parsenumeric(const struct sockaddr *sa, const char *addr,
                 char *host, size_t hostlen, int flags)
{
  size_t numaddrlen;
  char numaddr[512];

  if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
    return(EAI_SYSTEM);

  numaddrlen = strlen(numaddr);

  if (numaddrlen + 1 > hostlen) /* don't forget terminator */
    return(EAI_MEMORY);

  if (*numaddr == ':')
  {
    *host = '0';
    strlcpy(host+1, numaddr, hostlen-1);
  }
  else
    strlcpy(host, numaddr, hostlen);

  return(0);
}
#endif
Revision:	30
Committed:	Sun Oct 2 20:03:27 2005 UTC (20 years, 9 months ago) by adx
Content type:	text/x-csrc
File size:	6635 byte(s)
Log Message:	- imported sources - can be moved later according to the directory/branching scheme, but we need the svn up
#	Content
1	/*
2	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3	* All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 3. Neither the name of the project nor the names of its contributors
14	* may be used to endorse or promote products derived from this software
15	* without specific prior written permission.
16	*
17	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27	* SUCH DAMAGE.
28	*/
29
30	/*
31	* Issues to be discussed:
32	* - Thread safe-ness must be checked
33	* - RFC2553 says that we should raise error on short buffer. X/Open says
34	* we need to truncate the result. We obey RFC2553 (and X/Open should be
35	* modified). ipngwg rough consensus seems to follow RFC2553.
36	* - What is "local" in NI_FQDN?
37	* - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
38	* - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
39	* sin6_scope_id is filled - standardization status?
40	* XXX breaks backward compat for code that expects no scopeid.
41	* beware on merge.
42	*/
43
44	#include "stdinc.h"
45
46	#include "irc_getnameinfo.h"
47	#include "irc_string.h"
48
49	/* $Id: irc_getnameinfo.c,v 7.12 2003/12/20 23:01:57 metalrock Exp $ */
50
51	static const struct afd {
52	int a_af;
53	int a_addrlen;
54	socklen_t a_socklen;
55	int a_off;
56	} afdl [] = {
57	#ifdef IPV6
58	{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
59	offsetof(struct sockaddr_in6, sin6_addr)},
60	#endif
61	{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
62	offsetof(struct sockaddr_in, sin_addr)},
63	{0, 0, 0, 0},
64	};
65
66	struct sockinet
67	{
68	unsigned char si_len;
69	unsigned char si_family;
70	unsigned short si_port;
71	};
72
73	#ifdef IPV6
74	static int ip6_parsenumeric(const struct sockaddr , const char , char *,
75	size_t, int);
76	#endif
77
78	int
79	irc_getnameinfo(const struct sockaddr sa, socklen_t salen, char host,
80	size_t hostlen, char *serv, size_t servlen, int flags)
81	{
82	const struct afd *afd;
83	struct servent *sp;
84	unsigned short port;
85	int family, i;
86	const char *addr;
87	u_int32_t v4a;
88	char numserv[512];
89	char numaddr[512];
90
91	if (sa == NULL)
92	return EAI_FAIL;
93
94	/* if (sa->sa_len != salen)
95	return EAI_FAIL;
96	*/
97	family = sa->sa_family;
98	for (i = 0; afdl[i].a_af; i++)
99	if (afdl[i].a_af == family) {
100	afd = &afdl[i];
101	goto found;
102	}
103	return EAI_FAMILY;
104
105	found:
106	if (salen != afd->a_socklen)
107	return EAI_FAIL;
108
109	/* network byte order */
110	port = ((const struct sockinet *)sa)->si_port;
111	addr = (const char *)sa + afd->a_off;
112
113	if (serv == NULL \|\| servlen == 0) {
114	/*
115	* do nothing in this case.
116	* in case you are wondering if "&&" is more correct than
117	* "\|\|" here: rfc2553bis-03 says that serv == NULL OR
118	* servlen == 0 means that the caller does not want the result.
119	*/
120	} else {
121	if (flags & NI_NUMERICSERV)
122	sp = NULL;
123	else {
124	sp = getservbyport(port,
125	(flags & NI_DGRAM) ? "udp" : "tcp");
126	}
127	if (sp) {
128	if (strlen(sp->s_name) + 1 > servlen)
129	return EAI_MEMORY;
130	strlcpy(serv, sp->s_name, servlen);
131	} else {
132	snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
133	if (strlen(numserv) + 1 > servlen)
134	return EAI_MEMORY;
135	strlcpy(serv, numserv, servlen);
136	}
137	}
138
139	switch (sa->sa_family) {
140	case AF_INET:
141	v4a = (u_int32_t)
142	ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
143	if (IN_MULTICAST(v4a) \|\| IN_EXPERIMENTAL(v4a))
144	flags \|= NI_NUMERICHOST;
145	v4a >>= IN_CLASSA_NSHIFT;
146	if (v4a == 0)
147	flags \|= NI_NUMERICHOST;
148	break;
149	#ifdef IPV6
150	case AF_INET6:
151	{
152	const struct sockaddr_in6 *sin6;
153	sin6 = (const struct sockaddr_in6 *)sa;
154	switch (sin6->sin6_addr.s6_addr[0]) {
155	case 0x00:
156	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
157	;
158	else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
159	;
160	else
161	flags \|= NI_NUMERICHOST;
162	break;
163	default:
164	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
165	flags \|= NI_NUMERICHOST;
166	}
167	else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
168	flags \|= NI_NUMERICHOST;
169	break;
170	}
171	}
172	break;
173	#endif
174	}
175	if (host == NULL \|\| hostlen == 0) {
176	/*
177	* do nothing in this case.
178	* in case you are wondering if "&&" is more correct than
179	* "\|\|" here: rfc2553bis-03 says that host == NULL or
180	* hostlen == 0 means that the caller does not want the result.
181	*/
182	} else if (flags & NI_NUMERICHOST) {
183	size_t numaddrlen;
184
185	/* NUMERICHOST and NAMEREQD conflicts with each other */
186	if (flags & NI_NAMEREQD)
187	return EAI_NONAME;
188
189	switch(afd->a_af) {
190	#ifdef IPV6
191	case AF_INET6:
192	{
193	int error;
194
195	if ((error = ip6_parsenumeric(sa, addr, host,
196	hostlen, flags)) != 0)
197	return(error);
198	break;
199	}
200	#endif
201	default:
202	if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
203	== NULL)
204	return EAI_SYSTEM;
205	numaddrlen = strlen(numaddr);
206	if (numaddrlen + 1 > hostlen) /* don't forget terminator */
207	return EAI_MEMORY;
208	strlcpy(host, numaddr, hostlen);
209	break;
210	}
211	}
212	return(0);
213	}
214
215	#ifdef IPV6
216	static int
217	ip6_parsenumeric(const struct sockaddr sa, const char addr,
218	char *host, size_t hostlen, int flags)
219	{
220	size_t numaddrlen;
221	char numaddr[512];
222
223	if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
224	return(EAI_SYSTEM);
225
226	numaddrlen = strlen(numaddr);
227
228	if (numaddrlen + 1 > hostlen) /* don't forget terminator */
229	return(EAI_MEMORY);
230
231	if (*numaddr == ':')
232	{
233	*host = '0';
234	strlcpy(host+1, numaddr, hostlen-1);
235	}
236	else
237	strlcpy(host, numaddr, hostlen);
238
239	return(0);
240	}
241	#endif