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, 10 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
#	User	Rev	Content
1	adx	30	/*
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