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https://git.FreeBSD.org/src.git
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Add PF_LOCAL support in getaddrinfo(3) and getnameinfo(3):
- In a PF_LOCAL address, "hostname" must begins with '/' and "servname" is always NULL. All of ai_flags are ignored. - PF_UNSPEC matches PF_LOCAL. EAI_SERVICE is not returned to make AF-independent programming easier; "servname" is always ignored in PF_LOCAL. In practice, PF_INET* and PF_LOCAL are mutually-exclusive because a hostname which begins with '/' is invalid in PF_INET*. No domain name resolution is performed for a PF_LOCAL address. Differential Revision: https://reviews.freebsd.org/D3634
This commit is contained in:
Hiroki Sato
parent
fb0e28f0e1
commit
bb957021d7
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=287999
@ -18,7 +18,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 14, 2013
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.Dd September 20, 2015
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.Dt GETADDRINFO 3
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.Os
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.Sh NAME
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@ -40,7 +40,6 @@
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The
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.Fn getaddrinfo
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function is used to get a list of
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.Tn IP
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addresses and port numbers for host
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.Fa hostname
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and service
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@ -59,7 +58,9 @@ arguments are either pointers to NUL-terminated strings or the null pointer.
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An acceptable value for
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.Fa hostname
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is either a valid host name or a numeric host address string consisting
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of a dotted decimal IPv4 address or an IPv6 address.
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of a dotted decimal IPv4 address,
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an IPv6 address,
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or a UNIX-domain address.
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The
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.Fa servname
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is either a decimal port number or a service name listed in
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@ -105,6 +106,7 @@ operating system.
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Denotes the type of socket that is wanted:
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.Dv SOCK_STREAM ,
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.Dv SOCK_DGRAM ,
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.Dv SOCK_SEQPACKET ,
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or
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.Dv SOCK_RAW .
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When
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@ -112,9 +114,11 @@ When
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is zero the caller will accept any socket type.
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.It Fa ai_protocol
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Indicates which transport protocol is desired,
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.Dv IPPROTO_UDP
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.Dv IPPROTO_UDP ,
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.Dv IPPROTO_TCP ,
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.Dv IPPROTO_SCTP ,
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or
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.Dv IPPROTO_TCP .
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.Dv IPPROTO_UDPLITE .
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If
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.Fa ai_protocol
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is zero the caller will accept any protocol.
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@ -131,6 +135,9 @@ or be the bitwise-inclusive OR of one or more of the values
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.Dv AI_NUMERICSERV
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and
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.Dv AI_PASSIVE .
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For a UNIX-domain address,
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.Fa ai_flags
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is ignored.
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.Bl -tag -width "AI_CANONNAMEXX"
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.It Dv AI_ADDRCONFIG
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If the
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@ -419,6 +426,9 @@ freeaddrinfo(res0);
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.Xr getnameinfo 3 ,
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.Xr getservbyname 3 ,
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.Xr resolver 3 ,
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.Xr inet 4 ,
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.Xr inet6 4 ,
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.Xr unix 4 ,
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.Xr hosts 5 ,
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.Xr resolv.conf 5 ,
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.Xr services 5 ,
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@ -137,13 +137,20 @@ static const struct afd {
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offsetof(struct sockaddr_in6, sin6_addr),
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in6_addrany, in6_loopback, 1},
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#define N_INET 1
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#define N_LOCAL 2
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#else
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#define N_INET 0
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#define N_LOCAL 1
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#endif
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{PF_INET, sizeof(struct in_addr),
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sizeof(struct sockaddr_in),
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offsetof(struct sockaddr_in, sin_addr),
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in_addrany, in_loopback, 0},
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#define sizeofmember(type, member) (sizeof(((type *)0)->member))
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{PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
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sizeof(struct sockaddr_un),
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offsetof(struct sockaddr_un, sun_path),
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NULL, NULL, 0},
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{0, 0, 0, 0, NULL, NULL, 0},
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};
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@ -152,29 +159,47 @@ struct explore {
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int e_socktype;
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int e_protocol;
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int e_wild;
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#define WILD_AF(ex) ((ex)->e_wild & 0x01)
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#define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
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#define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
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#define AF_ANY 0x01
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#define SOCKTYPE_ANY 0x02
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#define PROTOCOL_ANY 0x04
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#define WILD_AF(ex) ((ex)->e_wild & AF_ANY)
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#define WILD_SOCKTYPE(ex) ((ex)->e_wild & SOCKTYPE_ANY)
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#define WILD_PROTOCOL(ex) ((ex)->e_wild & PROTOCOL_ANY)
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};
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static const struct explore explore[] = {
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#if 0
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{ PF_LOCAL, ANY, ANY, 0x01 },
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#endif
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{ PF_LOCAL, SOCK_DGRAM, ANY,
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AF_ANY | PROTOCOL_ANY },
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{ PF_LOCAL, SOCK_STREAM, ANY,
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AF_ANY | PROTOCOL_ANY },
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{ PF_LOCAL, SOCK_SEQPACKET, ANY,
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AF_ANY | PROTOCOL_ANY },
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#ifdef INET6
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{ PF_INET6, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
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{ PF_INET6, SOCK_STREAM, IPPROTO_TCP, 0x07 },
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{ PF_INET6, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
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{ PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
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{ PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
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{ PF_INET6, SOCK_RAW, ANY, 0x05 },
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{ PF_INET6, SOCK_DGRAM, IPPROTO_UDP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET6, SOCK_STREAM, IPPROTO_TCP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET6, SOCK_STREAM, IPPROTO_SCTP,
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AF_ANY | SOCKTYPE_ANY },
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{ PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE,
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AF_ANY | SOCKTYPE_ANY },
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{ PF_INET6, SOCK_RAW, ANY,
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AF_ANY | PROTOCOL_ANY },
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#endif
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{ PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
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{ PF_INET, SOCK_STREAM, IPPROTO_TCP, 0x07 },
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{ PF_INET, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
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{ PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
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{ PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
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{ PF_INET, SOCK_RAW, ANY, 0x05 },
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{ PF_INET, SOCK_DGRAM, IPPROTO_UDP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET, SOCK_STREAM, IPPROTO_TCP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET, SOCK_STREAM, IPPROTO_SCTP,
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AF_ANY | SOCKTYPE_ANY },
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{ PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP,
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AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
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{ PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE,
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AF_ANY | SOCKTYPE_ANY },
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{ PF_INET, SOCK_RAW, ANY,
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AF_ANY | PROTOCOL_ANY },
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{ -1, 0, 0, 0 },
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};
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@ -408,6 +433,7 @@ getaddrinfo(const char *hostname, const char *servname,
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ERR(EAI_BADFLAGS);
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switch (hints->ai_family) {
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case PF_UNSPEC:
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case PF_LOCAL:
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case PF_INET:
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#ifdef INET6
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case PF_INET6:
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@ -1130,6 +1156,9 @@ explore_null(const struct addrinfo *pai, const char *servname,
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*res = NULL;
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ai = NULL;
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if (pai->ai_family == PF_LOCAL)
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return (0);
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/*
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* filter out AFs that are not supported by the kernel
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* XXX errno?
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@ -1172,8 +1201,11 @@ explore_numeric(const struct addrinfo *pai, const char *hostname,
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const struct afd *afd;
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struct addrinfo *ai;
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int error;
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char pton[PTON_MAX];
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char pton[PTON_MAX], path[PATH_MAX], *p;
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#ifdef CTASSERT
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CTASSERT(sizeofmember(struct sockaddr_un, sun_path) <= PATH_MAX);
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#endif
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*res = NULL;
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ai = NULL;
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@ -1182,6 +1214,15 @@ explore_numeric(const struct addrinfo *pai, const char *hostname,
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return 0;
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switch (afd->a_af) {
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case AF_LOCAL:
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if (hostname[0] != '/')
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ERR(EAI_NONAME);
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if (strlen(hostname) > afd->a_addrlen)
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ERR(EAI_MEMORY);
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/* NUL-termination does not need to be guaranteed. */
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strncpy(path, hostname, afd->a_addrlen);
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p = &path[0];
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break;
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case AF_INET:
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/*
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* RFC3493 requires getaddrinfo() to accept AF_INET formats
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@ -1192,15 +1233,17 @@ explore_numeric(const struct addrinfo *pai, const char *hostname,
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*/
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if (inet_aton(hostname, (struct in_addr *)pton) != 1)
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return 0;
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p = pton;
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break;
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default:
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if (inet_pton(afd->a_af, hostname, pton) != 1)
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return 0;
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p = pton;
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break;
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}
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if (pai->ai_family == afd->a_af) {
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GET_AI(ai, afd, pton);
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GET_AI(ai, afd, p);
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GET_PORT(ai, servname);
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if ((pai->ai_flags & AI_CANONNAME)) {
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/*
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@ -1320,6 +1363,12 @@ get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
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memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
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ai->ai_addr->sa_len = afd->a_socklen;
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ai->ai_addrlen = afd->a_socklen;
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if (ai->ai_family == PF_LOCAL) {
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size_t n = strnlen(addr, afd->a_addrlen);
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ai->ai_addrlen -= afd->a_addrlen - n;
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ai->ai_addr->sa_len -= afd->a_addrlen - n;
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}
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ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
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p = (char *)(void *)(ai->ai_addr);
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memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
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@ -1378,6 +1427,9 @@ get_port(struct addrinfo *ai, const char *servname, int matchonly)
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if (servname == NULL)
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return 0;
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switch (ai->ai_family) {
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case AF_LOCAL:
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/* AF_LOCAL ignores servname silently. */
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return (0);
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case AF_INET:
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#ifdef AF_INET6
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case AF_INET6:
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@ -18,7 +18,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 14, 2013
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.Dd September 20, 2015
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.Dt GETNAMEINFO 3
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.Os
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.Sh NAME
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@ -47,7 +47,7 @@ functions and is the converse of the
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.Xr getaddrinfo 3
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function.
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.Pp
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If a link-layer address is passed to
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If a link-layer address or UNIX-domain address is passed to
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.Fn getnameinfo ,
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its ASCII representation will be stored in
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.Fa host .
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@ -56,7 +56,8 @@ The string pointed to by
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will be set to the empty string if non-NULL;
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.Fa flags
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will always be ignored.
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This is intended as a replacement for the legacy
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For a link-layer address,
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this can be used as a replacement of the legacy
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.Xr link_ntoa 3
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function.
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.Pp
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@ -66,10 +67,17 @@ structure
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.Fa sa
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should point to either a
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.Li sockaddr_in ,
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.Li sockaddr_in6
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.Li sockaddr_in6 ,
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.Li sockaddr_dl ,
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or
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.Li sockaddr_dl
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structure (for IPv4, IPv6 or link-layer respectively) that is
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.Li sockaddr_un
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structure
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.Po for IPv4 ,
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IPv6,
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link-layer,
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or UNIX-domain respectively
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.Pc
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that is
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.Fa salen
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bytes long.
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.Pp
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@ -182,6 +190,9 @@ printf("host=%s\en", hbuf);
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.Xr inet_ntop 3 ,
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.Xr link_ntoa 3 ,
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.Xr resolver 3 ,
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.Xr inet 4 ,
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.Xr inet6 4 ,
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.Xr unix 4 ,
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.Xr hosts 5 ,
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.Xr resolv.conf 5 ,
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.Xr services 5 ,
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@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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@ -62,67 +63,102 @@ __FBSDID("$FreeBSD$");
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#include <stddef.h>
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#include <errno.h>
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static int getnameinfo_inet(const struct sockaddr *, socklen_t, char *,
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static const struct afd *find_afd(int);
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static int getnameinfo_inet(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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#ifdef INET6
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static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
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size_t, int);
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static int ip6_sa2str(const struct sockaddr_in6 *, char *, size_t, int);
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#endif
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static int getnameinfo_link(const struct sockaddr *, socklen_t, char *,
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static int getnameinfo_link(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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static int hexname(const u_int8_t *, size_t, char *, size_t);
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static int getnameinfo_un(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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static int hexname(const u_int8_t *, size_t, char *, size_t);
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int
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getnameinfo(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen, char *serv, size_t servlen,
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int flags)
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{
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if (sa == NULL)
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return (EAI_FAIL);
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switch (sa->sa_family) {
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case AF_INET:
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#ifdef INET6
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case AF_INET6:
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#endif
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return getnameinfo_inet(sa, salen, host, hostlen, serv,
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servlen, flags);
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case AF_LINK:
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return getnameinfo_link(sa, salen, host, hostlen, serv,
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servlen, flags);
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default:
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return EAI_FAMILY;
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}
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}
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static const struct afd {
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int a_af;
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size_t a_addrlen;
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socklen_t a_socklen;
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int a_off;
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int (*a_func)(const struct afd *,
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const struct sockaddr *, socklen_t, char *,
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size_t, char *, size_t, int);
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} afdl [] = {
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#ifdef INET6
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{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
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offsetof(struct sockaddr_in6, sin6_addr)},
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offsetof(struct sockaddr_in6, sin6_addr),
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getnameinfo_inet},
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#endif
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{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
|
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offsetof(struct sockaddr_in, sin_addr)},
|
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offsetof(struct sockaddr_in, sin_addr),
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getnameinfo_inet},
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#define sizeofmember(type, member) (sizeof(((type *)0)->member))
|
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{PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
|
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sizeof(struct sockaddr_un),
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offsetof(struct sockaddr_un, sun_path),
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getnameinfo_un},
|
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{PF_LINK, sizeofmember(struct sockaddr_dl, sdl_data),
|
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sizeof(struct sockaddr_dl),
|
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offsetof(struct sockaddr_dl, sdl_data),
|
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getnameinfo_link},
|
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{0, 0, 0},
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};
|
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|
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struct sockinet {
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u_char si_len;
|
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u_char si_family;
|
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u_short si_port;
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};
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|
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static int
|
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getnameinfo_inet(const struct sockaddr *sa, socklen_t salen,
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int
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getnameinfo(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen, char *serv, size_t servlen,
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int flags)
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{
|
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const struct afd *afd;
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if (sa == NULL)
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return (EAI_FAIL);
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afd = find_afd(sa->sa_family);
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if (afd == NULL)
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return (EAI_FAMILY);
|
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if (sa->sa_family == PF_LOCAL) {
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/*
|
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* PF_LOCAL uses variable sa->sa_len depending on the
|
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* content length of sun_path. Require 1 byte in
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* sun_path at least.
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*/
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if (salen > afd->a_socklen ||
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salen <= afd->a_socklen -
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sizeofmember(struct sockaddr_un, sun_path))
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return (EAI_FAIL);
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} else if (salen != afd->a_socklen)
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return (EAI_FAIL);
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return ((*afd->a_func)(afd, sa, salen, host, hostlen,
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serv, servlen, flags));
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}
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||||
|
||||
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;
|
||||
@ -132,18 +168,8 @@ getnameinfo_inet(const struct sockaddr *sa, socklen_t salen,
|
||||
char numserv[512];
|
||||
char numaddr[512];
|
||||
|
||||
for (afd = &afdl[0]; afd->a_af > 0; afd++) {
|
||||
if (afd->a_af == sa->sa_family)
|
||||
break;
|
||||
}
|
||||
if (afd->a_af == 0)
|
||||
return (EAI_FAMILY);
|
||||
|
||||
if (salen != afd->a_socklen)
|
||||
return EAI_FAIL;
|
||||
|
||||
/* network byte order */
|
||||
port = ((const struct sockinet *)sa)->si_port;
|
||||
port = ((const struct sockaddr_in *)sa)->sin_port;
|
||||
addr = (const char *)sa + afd->a_off;
|
||||
|
||||
if (serv == NULL || servlen == 0) {
|
||||
@ -377,7 +403,8 @@ ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf, size_t bufsiz, int flags)
|
||||
*/
|
||||
/* ARGSUSED */
|
||||
static int
|
||||
getnameinfo_link(const struct sockaddr *sa, socklen_t salen,
|
||||
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 =
|
||||
@ -465,3 +492,30 @@ hexname(const u_int8_t *cp, size_t len, char *host, size_t hostlen)
|
||||
}
|
||||
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);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user