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https://github.com/freebsd/freebsd-src
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Add the userland part of the NET_RT_IFMALIST sysctl MIB. A new function,
getifmaddrs(), is added to retrieve current multicast group memberships. Reviewed by: harti
This commit is contained in:
Bruce M Simpson
parent
1a29c80648
commit
2554d76f85
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=122687
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@ -46,11 +46,20 @@ struct ifaddrs {
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#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
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#endif
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struct ifmaddrs {
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struct ifmaddrs *ifma_next;
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struct sockaddr *ifma_name;
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struct sockaddr *ifma_addr;
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struct sockaddr *ifma_lladdr;
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};
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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extern int getifaddrs(struct ifaddrs **);
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extern void freeifaddrs(struct ifaddrs *);
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extern int getifmaddrs(struct ifmaddrs **);
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extern void freeifmaddrs(struct ifmaddrs *);
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__END_DECLS
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#endif
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@ -6,7 +6,7 @@
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SRCS+= addr2ascii.c ascii2addr.c base64.c ether_addr.c getaddrinfo.c \
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gethostbydns.c gethostbyht.c gethostbynis.c gethostnamadr.c \
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getifaddrs.c getnameinfo.c \
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getifaddrs.c getifmaddrs.c getnameinfo.c \
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getnetbydns.c getnetbyht.c getnetbynis.c getnetnamadr.c \
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getproto.c getprotoent.c getprotoname.c getservbyname.c \
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getservbyport.c getservent.c herror.c hesiod.c inet_addr.c \
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@ -40,7 +40,7 @@ nslexer.c: nslexer.l nsparser.h
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.endif
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MAN+= addr2ascii.3 byteorder.3 ethers.3 getaddrinfo.3 gethostbyname.3 \
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getifaddrs.3 getipnodebyname.3 \
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getifaddrs.3 getifmaddrs.3 getipnodebyname.3 \
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getnameinfo.3 getnetent.3 getprotoent.3 getservent.3 hesiod.3 \
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if_indextoname.3 \
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inet.3 inet_net.3 \
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@ -59,6 +59,7 @@ MLINKS+=gethostbyname.3 endhostent.3 gethostbyname.3 gethostbyaddr.3 \
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gethostbyname.3 herror.3 gethostbyname.3 hstrerror.3 \
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gethostbyname.3 sethostent.3
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MLINKS+=getifaddrs.3 freeifaddrs.3
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MLINKS+=getifmaddrs.3 freeifmaddrs.3
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MLINKS+=getipnodebyname.3 getipnodebyaddr.3 getipnodebyname.3 freehostent.3
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MLINKS+=getnetent.3 endnetent.3 getnetent.3 getnetbyaddr.3 \
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getnetent.3 getnetbyname.3 getnetent.3 setnetent.3
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112
lib/libc/net/getifmaddrs.3
Normal file
112
lib/libc/net/getifmaddrs.3
Normal file
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@ -0,0 +1,112 @@
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.\" $FreeBSD$
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.\"
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.\" Copyright (c) 2003 Bruce M. Simpson. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Bruce M. Simpson ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL Bruce M. Simpson BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.Dd October 12, 1995
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.Dt GETIFMADDRS 3
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.Os
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.Sh NAME
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.Nm getifmaddrs
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.Nd get multicast group memberships
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In ifaddrs.h
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.Ft int
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.Fn getifmaddrs "struct ifmaddrs **ifmap"
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.Ft void
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.Fn freeifmaddrs "struct ifmaddrs *ifmp"
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.Sh DESCRIPTION
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The
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.Fn getifmaddrs
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function stores a reference to a linked list of the multicast memberships
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on the local machine in the memory referenced by
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.Fa ifmap .
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The list consists of
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.Nm ifmaddrs
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structures, as defined in the include file
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.Aq Pa ifaddrs.h .
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The
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.Nm ifmaddrs
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structure contains at least the following entries:
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.Bd -literal
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struct ifmaddrs *ifma_next; /* Pointer to next struct */
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struct sockaddr *ifma_name; /* Interface name (AF_LINK) */
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struct sockaddr *ifma_addr; /* Multicast address */
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struct sockaddr *ifma_lladdr; /* Link-layer translation, if any */
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.Ed
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.Pp
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The
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.Li ifma_next
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field contains a pointer to the next structure on the list.
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This field is
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.Dv NULL
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in last structure on the list.
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.Pp
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The
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.Li ifma_name
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field references an AF_LINK address structure, containing the name of the
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interface where the membership exists.
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.Pp
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The
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.Li ifma_addr
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references the address that this membership is for.
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.Pp
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The
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.Li ifma_lladdr
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field references a link-layer translation for the protocol-level address in
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.Li ifma_addr ,
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if one is set, otherwise it is NULL.
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.Pp
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The data returned by
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.Fn getifmaddrs
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is dynamically allocated and should be freed using
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.Fn freeifmaddrs
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when no longer needed.
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.Sh RETURN VALUES
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.Rv -std getifmaddrs
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.Sh ERRORS
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The
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.Fn getifmaddrs
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may fail and set
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.Va errno
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for any of the errors specified for the library routines
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.Xr malloc 3
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or
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.Xr sysctl 3 .
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.Sh BUGS
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If both
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.Aq Pa net/if.h
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and
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.Aq Pa ifaddrs.h
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are being included,
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.Aq Pa net/if.h
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.Em must
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be included before
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.Aq Pa ifaddrs.h .
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.Sh SEE ALSO
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.Xr sysctl 3 ,
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.Xr networking 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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implementation first appeared in
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.Fx 5.2 .
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207
lib/libc/net/getifmaddrs.c
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207
lib/libc/net/getifmaddrs.c
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@ -0,0 +1,207 @@
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/*
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* Copyright (c) 2003 Bruce M. Simpson.
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bruce M. Simpson.
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* 4. Neither the name of Bruce M. Simpson nor the names of other
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRUCE M. SIMPSON AND AFFILIATES
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRUCE M. SIMPSON OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <string.h>
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#include "un-namespace.h"
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#define SALIGN (sizeof(long) - 1)
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#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
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(SALIGN + 1))
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#define MAX_SYSCTL_TRY 5
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#define RTA_MASKS (RTA_GATEWAY | RTA_IFP | RTA_IFA)
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int
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getifmaddrs(struct ifmaddrs **pif)
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{
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int icnt = 1;
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int dcnt = 0;
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int ntry = 0;
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u_short idx = 0;
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size_t len;
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size_t needed;
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int mib[6];
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int i;
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char *buf;
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char *data;
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char *names;
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char *next;
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char *p;
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struct ifma_msghdr *ifmam;
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struct ifmaddrs *ifa, *ift;
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struct rt_msghdr *rtm;
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struct sockaddr *sa;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0; /* protocol */
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mib[3] = 0; /* wildcard address family */
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mib[4] = NET_RT_IFMALIST;
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mib[5] = 0; /* no flags */
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do {
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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return (-1);
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if ((buf = malloc(needed)) == NULL)
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return (-1);
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
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free(buf);
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return (-1);
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}
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free(buf);
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buf = NULL;
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}
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} while (buf == NULL);
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for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)(void *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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switch (rtm->rtm_type) {
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case RTM_NEWMADDR:
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ifmam = (struct ifma_msghdr *)(void *)rtm;
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if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
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break;
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icnt++;
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p = (char *)(ifmam + 1);
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for (i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifmam->ifmam_addrs &
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(1 << i)) == 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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dcnt += len;
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p += len;
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}
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break;
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}
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}
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data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
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if (data == NULL) {
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free(buf);
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return (-1);
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}
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ifa = (struct ifmaddrs *)(void *)data;
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data += sizeof(struct ifmaddrs) * icnt;
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names = data + dcnt;
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memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
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ift = ifa;
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idx = 0;
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for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)(void *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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switch (rtm->rtm_type) {
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case RTM_NEWMADDR:
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ifmam = (struct ifma_msghdr *)(void *)rtm;
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if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
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break;
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p = (char *)(ifmam + 1);
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for (i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifmam->ifmam_addrs &
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(1 << i)) == 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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switch (i) {
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case RTAX_GATEWAY:
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ift->ifma_lladdr =
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(struct sockaddr *)(void *)data;
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memcpy(data, p, len);
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data += len;
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break;
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case RTAX_IFP:
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ift->ifma_name =
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(struct sockaddr *)(void *)data;
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memcpy(data, p, len);
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data += len;
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break;
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case RTAX_IFA:
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ift->ifma_addr =
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(struct sockaddr *)(void *)data;
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memcpy(data, p, len);
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data += len;
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break;
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default:
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data += len;
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break;
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}
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p += len;
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}
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ift->ifma_next = ift + 1;
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ift = ift->ifma_next;
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break;
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}
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}
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free(buf);
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if (ift > ifa) {
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ift--;
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ift->ifma_next = NULL;
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*pif = ifa;
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} else {
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*pif = NULL;
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free(ifa);
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}
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return (0);
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}
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void
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freeifmaddrs(struct ifmaddrs *ifmp)
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{
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free(ifmp);
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}
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