Index: head/include/netdb.h =================================================================== --- head/include/netdb.h (revision 303427) +++ head/include/netdb.h (revision 303428) @@ -1,306 +1,304 @@ /*- * Copyright (c) 1980, 1983, 1988, 1993 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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. * * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. * - * --Copyright-- */ /* * @(#)netdb.h 8.1 (Berkeley) 6/2/93 * From: Id: netdb.h,v 8.9 1996/11/19 08:39:29 vixie Exp $ * $FreeBSD$ */ #ifndef _NETDB_H_ #define _NETDB_H_ #include #include #ifndef _IN_ADDR_T_DECLARED typedef __uint32_t in_addr_t; #define _IN_ADDR_T_DECLARED #endif #ifndef _IN_PORT_T_DECLARED typedef __uint16_t in_port_t; #define _IN_PORT_T_DECLARED #endif #ifndef _SIZE_T_DECLARED typedef __size_t size_t; #define _SIZE_T_DECLARED #endif #ifndef _SOCKLEN_T_DECLARED typedef __socklen_t socklen_t; #define _SOCKLEN_T_DECLARED #endif #ifndef _UINT32_T_DECLARED typedef __uint32_t uint32_t; #define _UINT32_T_DECLARED #endif #ifndef _PATH_HEQUIV # define _PATH_HEQUIV "/etc/hosts.equiv" #endif #define _PATH_HOSTS "/etc/hosts" #define _PATH_NETWORKS "/etc/networks" #define _PATH_PROTOCOLS "/etc/protocols" #define _PATH_SERVICES "/etc/services" #define _PATH_SERVICES_DB "/var/db/services.db" #define h_errno (*__h_errno()) /* * Structures returned by network data base library. All addresses are * supplied in host order, and returned in network order (suitable for * use in system calls). */ struct hostent { char *h_name; /* official name of host */ char **h_aliases; /* alias list */ int h_addrtype; /* host address type */ int h_length; /* length of address */ char **h_addr_list; /* list of addresses from name server */ #define h_addr h_addr_list[0] /* address, for backward compatibility */ }; struct netent { char *n_name; /* official name of net */ char **n_aliases; /* alias list */ int n_addrtype; /* net address type */ uint32_t n_net; /* network # */ }; struct servent { char *s_name; /* official service name */ char **s_aliases; /* alias list */ int s_port; /* port # */ char *s_proto; /* protocol to use */ }; struct protoent { char *p_name; /* official protocol name */ char **p_aliases; /* alias list */ int p_proto; /* protocol # */ }; struct addrinfo { int ai_flags; /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */ int ai_family; /* AF_xxx */ int ai_socktype; /* SOCK_xxx */ int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */ socklen_t ai_addrlen; /* length of ai_addr */ char *ai_canonname; /* canonical name for hostname */ struct sockaddr *ai_addr; /* binary address */ struct addrinfo *ai_next; /* next structure in linked list */ }; #define IPPORT_RESERVED 1024 /* * Error return codes from gethostbyname() and gethostbyaddr() * (left in h_errno). */ #define NETDB_INTERNAL -1 /* see errno */ #define NETDB_SUCCESS 0 /* no problem */ #define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */ #define TRY_AGAIN 2 /* Non-Authoritative Host not found, or SERVERFAIL */ #define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */ #define NO_DATA 4 /* Valid name, no data record of requested type */ #define NO_ADDRESS NO_DATA /* no address, look for MX record */ /* * Error return codes from getaddrinfo() */ #if 0 /* obsoleted */ #define EAI_ADDRFAMILY 1 /* address family for hostname not supported */ #endif #define EAI_AGAIN 2 /* temporary failure in name resolution */ #define EAI_BADFLAGS 3 /* invalid value for ai_flags */ #define EAI_FAIL 4 /* non-recoverable failure in name resolution */ #define EAI_FAMILY 5 /* ai_family not supported */ #define EAI_MEMORY 6 /* memory allocation failure */ #if 0 /* obsoleted */ #define EAI_NODATA 7 /* no address associated with hostname */ #endif #define EAI_NONAME 8 /* hostname nor servname provided, or not known */ #define EAI_SERVICE 9 /* servname not supported for ai_socktype */ #define EAI_SOCKTYPE 10 /* ai_socktype not supported */ #define EAI_SYSTEM 11 /* system error returned in errno */ #define EAI_BADHINTS 12 /* invalid value for hints */ #define EAI_PROTOCOL 13 /* resolved protocol is unknown */ #define EAI_OVERFLOW 14 /* argument buffer overflow */ #define EAI_MAX 15 /* * Flag values for getaddrinfo() */ #define AI_PASSIVE 0x00000001 /* get address to use bind() */ #define AI_CANONNAME 0x00000002 /* fill ai_canonname */ #define AI_NUMERICHOST 0x00000004 /* prevent host name resolution */ #define AI_NUMERICSERV 0x00000008 /* prevent service name resolution */ /* valid flags for addrinfo (not a standard def, apps should not use it) */ #define AI_MASK \ (AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST | AI_NUMERICSERV | \ AI_ADDRCONFIG | AI_ALL | AI_V4MAPPED) #define AI_ALL 0x00000100 /* IPv6 and IPv4-mapped (with AI_V4MAPPED) */ #define AI_V4MAPPED_CFG 0x00000200 /* accept IPv4-mapped if kernel supports */ #define AI_ADDRCONFIG 0x00000400 /* only if any address is assigned */ #define AI_V4MAPPED 0x00000800 /* accept IPv4-mapped IPv6 address */ /* special recommended flags for getipnodebyname */ #define AI_DEFAULT (AI_V4MAPPED_CFG | AI_ADDRCONFIG) /* * Constants for getnameinfo() */ #define NI_MAXHOST 1025 #define NI_MAXSERV 32 /* * Flag values for getnameinfo() */ #define NI_NOFQDN 0x00000001 #define NI_NUMERICHOST 0x00000002 #define NI_NAMEREQD 0x00000004 #define NI_NUMERICSERV 0x00000008 #define NI_DGRAM 0x00000010 -#if 0 /* obsolete */ -#define NI_WITHSCOPEID 0x00000020 -#endif +#define NI_NUMERICSCOPE 0x00000020 /* * Scope delimit character */ #define SCOPE_DELIMITER '%' __BEGIN_DECLS void endhostent(void); void endnetent(void); void endprotoent(void); void endservent(void); #if __BSD_VISIBLE || (__POSIX_VISIBLE && __POSIX_VISIBLE <= 200112) struct hostent *gethostbyaddr(const void *, socklen_t, int); struct hostent *gethostbyname(const char *); #endif struct hostent *gethostent(void); struct netent *getnetbyaddr(uint32_t, int); struct netent *getnetbyname(const char *); struct netent *getnetent(void); struct protoent *getprotobyname(const char *); struct protoent *getprotobynumber(int); struct protoent *getprotoent(void); struct servent *getservbyname(const char *, const char *); struct servent *getservbyport(int, const char *); struct servent *getservent(void); void sethostent(int); /* void sethostfile(const char *); */ void setnetent(int); void setprotoent(int); int getaddrinfo(const char *, const char *, const struct addrinfo *, struct addrinfo **); int getnameinfo(const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); void freeaddrinfo(struct addrinfo *); const char *gai_strerror(int); void setservent(int); #if __BSD_VISIBLE void endnetgrent(void); void freehostent(struct hostent *); int gethostbyaddr_r(const void *, socklen_t, int, struct hostent *, char *, size_t, struct hostent **, int *); int gethostbyname_r(const char *, struct hostent *, char *, size_t, struct hostent **, int *); struct hostent *gethostbyname2(const char *, int); int gethostbyname2_r(const char *, int, struct hostent *, char *, size_t, struct hostent **, int *); int gethostent_r(struct hostent *, char *, size_t, struct hostent **, int *); struct hostent *getipnodebyaddr(const void *, size_t, int, int *); struct hostent *getipnodebyname(const char *, int, int, int *); int getnetbyaddr_r(uint32_t, int, struct netent *, char *, size_t, struct netent**, int *); int getnetbyname_r(const char *, struct netent *, char *, size_t, struct netent **, int *); int getnetent_r(struct netent *, char *, size_t, struct netent **, int *); int getnetgrent(char **, char **, char **); int getnetgrent_r(char **, char **, char **, char *, size_t); int getprotobyname_r(const char *, struct protoent *, char *, size_t, struct protoent **); int getprotobynumber_r(int, struct protoent *, char *, size_t, struct protoent **); int getprotoent_r(struct protoent *, char *, size_t, struct protoent **); int getservbyname_r(const char *, const char *, struct servent *, char *, size_t, struct servent **); int getservbyport_r(int, const char *, struct servent *, char *, size_t, struct servent **); int getservent_r(struct servent *, char *, size_t, struct servent **); void herror(const char *); const char *hstrerror(int); int innetgr(const char *, const char *, const char *, const char *); void setnetgrent(const char *); #endif /* * PRIVATE functions specific to the FreeBSD implementation */ /* DO NOT USE THESE, THEY ARE SUBJECT TO CHANGE AND ARE NOT PORTABLE!!! */ int * __h_errno(void); __END_DECLS #endif /* !_NETDB_H_ */ Index: head/lib/libc/net/getnameinfo.3 =================================================================== --- head/lib/libc/net/getnameinfo.3 (revision 303427) +++ head/lib/libc/net/getnameinfo.3 (revision 303428) @@ -1,296 +1,298 @@ .\" $KAME: getnameinfo.3,v 1.37 2005/01/05 03:23:05 itojun Exp $ .\" $OpenBSD: getnameinfo.3,v 1.36 2004/12/21 09:48:20 jmc Exp $ .\" .\" Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") .\" Copyright (C) 2000, 2001 Internet Software Consortium. .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH .\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY .\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, .\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM .\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE .\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR .\" PERFORMANCE OF THIS SOFTWARE. .\" .\" $FreeBSD$ .\" -.Dd September 20, 2015 +.Dd July 28, 2016 .Dt GETNAMEINFO 3 .Os .Sh NAME .Nm getnameinfo .Nd socket address structure to hostname and service name .Sh SYNOPSIS .In sys/types.h .In sys/socket.h .In netdb.h .Ft int .Fo getnameinfo .Fa "const struct sockaddr *sa" "socklen_t salen" "char *host" .Fa "size_t hostlen" "char *serv" "size_t servlen" "int flags" .Fc .Sh DESCRIPTION The .Fn getnameinfo function is used to convert a .Li sockaddr structure to a pair of host name and service strings. It is a replacement for and provides more flexibility than the .Xr gethostbyaddr 3 and .Xr getservbyport 3 functions and is the converse of the .Xr getaddrinfo 3 function. .Pp If a link-layer address or UNIX-domain address is passed to .Fn getnameinfo , its ASCII representation will be stored in .Fa host . The string pointed to by .Fa serv will be set to the empty string if non-NULL; .Fa flags will always be ignored. For a link-layer address, this can be used as a replacement of the legacy .Xr link_ntoa 3 function. .Pp The .Li sockaddr structure .Fa sa should point to either a .Li sockaddr_in , .Li sockaddr_in6 , .Li sockaddr_dl , or .Li sockaddr_un structure .Po for IPv4 , IPv6, link-layer, or UNIX-domain respectively .Pc that is .Fa salen bytes long. .Pp The host and service names associated with .Fa sa are stored in .Fa host and .Fa serv which have length parameters .Fa hostlen and .Fa servlen . The maximum value for .Fa hostlen is .Dv NI_MAXHOST and the maximum value for .Fa servlen is .Dv NI_MAXSERV , as defined by .Aq Pa netdb.h . If a length parameter is zero, no string will be stored. Otherwise, enough space must be provided to store the host name or service string plus a byte for the NUL terminator. .Pp The .Fa flags argument is formed by .Tn OR Ns 'ing the following values: -.Bl -tag -width "NI_NUMERICHOSTXX" +.Bl -tag -width "NI_NUMERICSCOPEXX" .It Dv NI_NOFQDN A fully qualified domain name is not required for local hosts. The local part of the fully qualified domain name is returned instead. .It Dv NI_NUMERICHOST Return the address in numeric form, as if calling .Xr inet_ntop 3 , instead of a host name. .It Dv NI_NAMEREQD A name is required. If the host name cannot be found in DNS and this flag is set, a non-zero error code is returned. If the host name is not found and the flag is not set, the address is returned in numeric form. .It NI_NUMERICSERV The service name is returned as a digit string representing the port number. +.It NI_NUMERICSCOPE +The scope identifier is returned as a digit string. .It NI_DGRAM Specifies that the service being looked up is a datagram service, and causes .Xr getservbyport 3 to be called with a second argument of .Dq udp instead of its default of .Dq tcp . This is required for the few ports (512\-514) that have different services for .Tn UDP and .Tn TCP . .El .Pp This implementation allows numeric IPv6 address notation with scope identifier, as documented in chapter 11 of RFC 4007. IPv6 link-local address will appear as a string like .Dq Li fe80::1%ne0 . Refer to .Xr getaddrinfo 3 for more information. .Sh RETURN VALUES .Fn getnameinfo returns zero on success or one of the error codes listed in .Xr gai_strerror 3 if an error occurs. .Sh EXAMPLES The following code tries to get a numeric host name, and service name, for a given socket address. Observe that there is no hardcoded reference to a particular address family. .Bd -literal -offset indent struct sockaddr *sa; /* input */ char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV)) { errx(1, "could not get numeric hostname"); /* NOTREACHED */ } printf("host=%s, serv=%s\en", hbuf, sbuf); .Ed .Pp The following version checks if the socket address has a reverse address mapping: .Bd -literal -offset indent struct sockaddr *sa; /* input */ char hbuf[NI_MAXHOST]; if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, NI_NAMEREQD)) { errx(1, "could not resolve hostname"); /* NOTREACHED */ } printf("host=%s\en", hbuf); .Ed .Sh SEE ALSO .Xr gai_strerror 3 , .Xr getaddrinfo 3 , .Xr gethostbyaddr 3 , .Xr getservbyport 3 , .Xr inet_ntop 3 , .Xr link_ntoa 3 , .Xr resolver 3 , .Xr inet 4 , .Xr inet6 4 , .Xr unix 4 , .Xr hosts 5 , .Xr resolv.conf 5 , .Xr services 5 , .Xr hostname 7 , .Xr named 8 .Rs .%A R. Gilligan .%A S. Thomson .%A J. Bound .%A J. McCann .%A W. Stevens .%T Basic Socket Interface Extensions for IPv6 .%R RFC 3493 .%D February 2003 .Re .Rs .%A S. Deering .%A B. Haberman .%A T. Jinmei .%A E. Nordmark .%A B. Zill .%T "IPv6 Scoped Address Architecture" .%R RFC 4007 .%D March 2005 .Re .Rs .%A Craig Metz .%T Protocol Independence Using the Sockets API .%B "Proceedings of the freenix track: 2000 USENIX annual technical conference" .%D June 2000 .Re .Sh STANDARDS The .Fn getnameinfo function is defined by the .St -p1003.1-2004 specification and documented in .Tn "RFC 3493" , .Dq Basic Socket Interface Extensions for IPv6 . .Sh CAVEATS .Fn getnameinfo can return both numeric and FQDN forms of the address specified in .Fa sa . There is no return value that indicates whether the string returned in .Fa host is a result of binary to numeric-text translation (like .Xr inet_ntop 3 ) , or is the result of a DNS reverse lookup. Because of this, malicious parties could set up a PTR record as follows: .Bd -literal -offset indent 1.0.0.127.in-addr.arpa. IN PTR 10.1.1.1 .Ed .Pp and trick the caller of .Fn getnameinfo into believing that .Fa sa is .Li 10.1.1.1 when it is actually .Li 127.0.0.1 . .Pp To prevent such attacks, the use of .Dv NI_NAMEREQD is recommended when the result of .Fn getnameinfo is used for access control purposes: .Bd -literal -offset indent struct sockaddr *sa; socklen_t salen; char addr[NI_MAXHOST]; struct addrinfo hints, *res; int error; error = getnameinfo(sa, salen, addr, sizeof(addr), NULL, 0, NI_NAMEREQD); if (error == 0) { memset(&hints, 0, sizeof(hints)); hints.ai_socktype = SOCK_DGRAM; /*dummy*/ hints.ai_flags = AI_NUMERICHOST; if (getaddrinfo(addr, "0", &hints, &res) == 0) { /* malicious PTR record */ freeaddrinfo(res); printf("bogus PTR record\en"); return -1; } /* addr is FQDN as a result of PTR lookup */ } else { /* addr is numeric string */ error = getnameinfo(sa, salen, addr, sizeof(addr), NULL, 0, NI_NUMERICHOST); } .Ed .\".Pp .\".Ox .\"intentionally uses a different .\".Dv NI_MAXHOST .\"value from what .\".Tn "RFC 2553" .\"suggests, to avoid buffer length handling mistakes. Index: head/lib/libc/net/getnameinfo.c =================================================================== --- head/lib/libc/net/getnameinfo.c (revision 303427) +++ head/lib/libc/net/getnameinfo.c (revision 303428) @@ -1,531 +1,529 @@ /* $KAME: getnameinfo.c,v 1.61 2002/06/27 09:25:47 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * Copyright (c) 2000 Ben Harris. * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static const struct afd *find_afd(int); static int getnameinfo_inet(const struct afd *, const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); #ifdef INET6 static int ip6_parsenumeric(const struct sockaddr *, const char *, char *, size_t, int); static int ip6_sa2str(const struct sockaddr_in6 *, char *, size_t, int); #endif static int getnameinfo_link(const struct afd *, const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); static int hexname(const u_int8_t *, size_t, char *, size_t); static int getnameinfo_un(const struct afd *, const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); static const struct afd { int a_af; size_t a_addrlen; socklen_t a_socklen; int a_off; int (*a_func)(const struct afd *, const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); } afdl [] = { #ifdef INET6 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), offsetof(struct sockaddr_in6, sin6_addr), getnameinfo_inet}, #endif {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), offsetof(struct sockaddr_in, sin_addr), getnameinfo_inet}, #define sizeofmember(type, member) (sizeof(((type *)0)->member)) {PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path), sizeof(struct sockaddr_un), offsetof(struct sockaddr_un, sun_path), getnameinfo_un}, {PF_LINK, sizeofmember(struct sockaddr_dl, sdl_data), sizeof(struct sockaddr_dl), offsetof(struct sockaddr_dl, sdl_data), getnameinfo_link}, {0, 0, 0}, }; int getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) { const struct afd *afd; if (sa == NULL) return (EAI_FAIL); afd = find_afd(sa->sa_family); if (afd == NULL) return (EAI_FAMILY); switch (sa->sa_family) { case PF_LOCAL: /* * PF_LOCAL uses variable sa->sa_len depending on the * content length of sun_path. Require 1 byte in * sun_path at least. */ if (salen > afd->a_socklen || salen <= afd->a_socklen - sizeofmember(struct sockaddr_un, sun_path)) return (EAI_FAIL); break; case PF_LINK: if (salen <= afd->a_socklen - sizeofmember(struct sockaddr_dl, sdl_data)) return (EAI_FAIL); break; default: if (salen != afd->a_socklen) return (EAI_FAIL); break; } return ((*afd->a_func)(afd, sa, salen, host, hostlen, serv, servlen, flags)); } static const struct afd * find_afd(int af) { const struct afd *afd; if (af == PF_UNSPEC) return (NULL); for (afd = &afdl[0]; afd->a_af > 0; afd++) { if (afd->a_af == af) return (afd); } return (NULL); } static int getnameinfo_inet(const struct afd *afd, const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) { struct servent *sp; struct hostent *hp; u_short port; const char *addr; u_int32_t v4a; int h_error; char numserv[512]; char numaddr[512]; /* network byte order */ port = ((const struct sockaddr_in *)sa)->sin_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 INET6 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 INET6 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; } } else { hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error); if (hp) { #if 0 /* * commented out, since "for local host" is not * implemented here - see RFC2553 p30 */ if (flags & NI_NOFQDN) { char *p; p = strchr(hp->h_name, '.'); if (p) *p = '\0'; } #endif if (strlen(hp->h_name) + 1 > hostlen) { freehostent(hp); return EAI_MEMORY; } strlcpy(host, hp->h_name, hostlen); freehostent(hp); } else { if (flags & NI_NAMEREQD) return EAI_NONAME; switch(afd->a_af) { #ifdef INET6 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, host, hostlen) == NULL) return EAI_SYSTEM; break; } } } return(0); } #ifdef INET6 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_OVERFLOW; strlcpy(host, numaddr, hostlen); if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) { char zonebuf[MAXHOSTNAMELEN]; int zonelen; zonelen = ip6_sa2str( (const struct sockaddr_in6 *)(const void *)sa, zonebuf, sizeof(zonebuf), flags); if (zonelen < 0) return EAI_OVERFLOW; if (zonelen + 1 + numaddrlen + 1 > hostlen) return EAI_OVERFLOW; /* construct */ memcpy(host + numaddrlen + 1, zonebuf, (size_t)zonelen); host[numaddrlen] = SCOPE_DELIMITER; host[numaddrlen + 1 + zonelen] = '\0'; } return 0; } /* ARGSUSED */ static int ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf, size_t bufsiz, int flags) { unsigned int ifindex; const struct in6_addr *a6; int n; ifindex = (unsigned int)sa6->sin6_scope_id; a6 = &sa6->sin6_addr; -#ifdef NI_NUMERICSCOPE if ((flags & NI_NUMERICSCOPE) != 0) { n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id); if (n < 0 || n >= bufsiz) return -1; else return n; } -#endif /* if_indextoname() does not take buffer size. not a good api... */ if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) || IN6_IS_ADDR_MC_NODELOCAL(a6)) && bufsiz >= IF_NAMESIZE) { char *p = if_indextoname(ifindex, buf); if (p) { return(strlen(p)); } } /* last resort */ n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id); if (n < 0 || (size_t)n >= bufsiz) return -1; else return n; } #endif /* INET6 */ /* * getnameinfo_link(): * Format a link-layer address into a printable format, paying attention to * the interface type. */ /* ARGSUSED */ static int getnameinfo_link(const struct afd *afd, const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) { const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)(const void *)sa; const struct fw_hwaddr *iha; int n; if (serv != NULL && servlen > 0) *serv = '\0'; if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 && sdl->sdl_slen == 0) { n = snprintf(host, hostlen, "link#%d", sdl->sdl_index); if (n >= hostlen) { *host = '\0'; return (EAI_MEMORY); } return (0); } if (sdl->sdl_nlen > 0 && sdl->sdl_alen == 0) { n = sdl->sdl_nlen; if (n >= hostlen) { *host = '\0'; return (EAI_MEMORY); } memcpy(host, sdl->sdl_data, sdl->sdl_nlen); host[n] = '\0'; return (0); } switch (sdl->sdl_type) { case IFT_IEEE1394: if (sdl->sdl_alen < sizeof(iha->sender_unique_ID_hi) + sizeof(iha->sender_unique_ID_lo)) return EAI_FAMILY; iha = (const struct fw_hwaddr *)(const void *)LLADDR(sdl); return hexname((const u_int8_t *)&iha->sender_unique_ID_hi, sizeof(iha->sender_unique_ID_hi) + sizeof(iha->sender_unique_ID_lo), host, hostlen); /* * The following have zero-length addresses. * IFT_ATM (net/if_atmsubr.c) * IFT_GIF (net/if_gif.c) * IFT_LOOP (net/if_loop.c) * IFT_PPP (net/if_ppp.c, net/if_spppsubr.c) * IFT_SLIP (net/if_sl.c, net/if_strip.c) * IFT_STF (net/if_stf.c) * IFT_L2VLAN (net/if_vlan.c) * IFT_BRIDGE (net/if_bridge.h> */ /* * The following use IPv4 addresses as link-layer addresses: * IFT_OTHER (net/if_gre.c) * IFT_OTHER (netinet/ip_ipip.c) */ /* default below is believed correct for all these. */ case IFT_ARCNET: case IFT_ETHER: case IFT_FDDI: case IFT_HIPPI: case IFT_ISO88025: default: return hexname((u_int8_t *)LLADDR(sdl), (size_t)sdl->sdl_alen, host, hostlen); } } static int hexname(const u_int8_t *cp, size_t len, char *host, size_t hostlen) { int i, n; char *outp = host; *outp = '\0'; for (i = 0; i < len; i++) { n = snprintf(outp, hostlen, "%s%02x", i ? ":" : "", cp[i]); if (n < 0 || n >= hostlen) { *host = '\0'; return EAI_MEMORY; } outp += n; hostlen -= n; } return 0; } /* * getnameinfo_un(): * Format a UNIX IPC domain address (pathname). */ /* ARGSUSED */ static int getnameinfo_un(const struct afd *afd, const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) { size_t pathlen; if (serv != NULL && servlen > 0) *serv = '\0'; if (host != NULL && hostlen > 0) { pathlen = sa->sa_len - afd->a_off; if (pathlen + 1 > hostlen) { *host = '\0'; return (EAI_MEMORY); } strlcpy(host, (const char *)sa + afd->a_off, pathlen + 1); } return (0); }