mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
28a0841bf5
Because different platforms have different levels of support for IPv6, different kinds of sockaddr variants, and some have getaddrinfo et al while others don't, we could end up with a mess if ifdefs, duplicate code and other maintainance nightmares. Instead, we're introducing wrappers around the common form for socket communication: BIO_ADDR, closely related to struct sockaddr and some of its variants. BIO_ADDRINFO, closely related to struct addrinfo. With that comes support routines, both convenient creators and accessors, plus a few utility functions: BIO_parse_hostserv, takes a string of the form host:service and splits it into host and service. It checks for * in both parts, and converts any [ipv6-address] syntax to ust the IPv6 address. BIO_lookup, looks up information on a host. All routines handle IPv4 (AF_INET) and IPv6 (AF_INET6) addresses, and there is support for local sockets (AF_UNIX) as well. Reviewed-by: Kurt Roeckx <kurt@openssl.org>
110 lines
4.3 KiB
Plaintext
110 lines
4.3 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BIO_ADDR, BIO_ADDR_new, BIO_ADDR_free, BIO_ADDR_rawmake,
|
|
BIO_ADDR_family, BIO_ADDR_rawaddress, BIO_ADDR_rawport,
|
|
BIO_ADDR_hostname_string, BIO_ADDR_service_string,
|
|
BIO_ADDR_path_string - BIO_ADDR routines
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <sys/types.h>
|
|
#include <openssl/bio.h>
|
|
|
|
typedef union bio_addr_st BIO_ADDR;
|
|
|
|
BIO_ADDR *BIO_ADDR_new(void);
|
|
void BIO_ADDR_free(BIO_ADDR *);
|
|
int BIO_ADDR_rawmake(BIO_ADDR *ap, int family,
|
|
const void *where, size_t wherelen, unsigned short port);
|
|
int BIO_ADDR_family(const BIO_ADDR *ap);
|
|
int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l);
|
|
unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap);
|
|
char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric);
|
|
char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric);
|
|
char *BIO_ADDR_path_string(const BIO_ADDR *ap);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The B<BIO_ADDR> type is a wrapper around all types of socket
|
|
addresses that OpenSSL deals with, currently transparently
|
|
supporting AF_INET, AF_INET6 and AF_UNIX according to what's
|
|
available on the platform at hand.
|
|
|
|
BIO_ADDR_new() creates a new unfilled B<BIO_ADDR>, to be used
|
|
with routines that will fill it with information, such as
|
|
BIO_accept_ex().
|
|
|
|
BIO_ADDR_free() frees a B<BIO_ADDR> created with BIO_ADDR_new().
|
|
|
|
BIO_ADDR_rawmake() takes a protocol B<family>, an byte array of
|
|
size B<wherelen> with an address in network byte order pointed at
|
|
by B<where> and a port number in network byte order in B<port> (except
|
|
for the B<AF_UNIX> protocol family, where B<port> is meaningless and
|
|
therefore ignored) and populates the given B<BIO_ADDR> with them.
|
|
In case this creates a B<AF_UNIX> B<BIO_ADDR>, B<wherelen> is expected
|
|
to be the length of the path string (not including the terminating
|
|
NUL, such as the result of a call to strlen()).
|
|
I<Read on about the addresses in L</RAW ADDRESSES> below>.
|
|
|
|
BIO_ADDR_family() returns the protocol family of the given
|
|
B<BIO_ADDR>. The possible non-error results are one of the
|
|
constants AF_INET, AF_INET6 and AF_UNIX.
|
|
|
|
BIO_ADDR_rawaddress() will write the raw address of the given
|
|
B<BIO_ADDR> in the area pointed at by B<p> if B<p> is non-NULL,
|
|
and will set B<*l> to be the amount of bytes the raw address
|
|
takes up if B<l> is non-NULL.
|
|
A technique to only find out the size of the address is a call
|
|
with B<p> set to B<NULL>. The raw address will be in network byte
|
|
order, most significant byte first.
|
|
In case this is a B<AF_UNIX> B<BIO_ADDR>, B<l> gets the length of the
|
|
path string (not including the terminating NUL, such as the result of
|
|
a call to strlen()).
|
|
I<Read on about the addresses in L</RAW ADDRESSES> below>.
|
|
|
|
BIO_ADDR_rawport() returns the raw port of the given B<BIO_ADDR>.
|
|
The raw port will be in network byte order.
|
|
|
|
BIO_ADDR_hostname_string() returns a character string with the
|
|
hostname of the given B<BIO_ADDR>. If B<numeric> is 1, the string
|
|
will contain the numerical form of the address. This only works for
|
|
B<BIO_ADDR> of the protocol families AF_INET and AF_INET6. The
|
|
returned string has been allocated on the heap and must be freed
|
|
with OPENSSL_free().
|
|
|
|
BIO_ADDR_service_string() returns a character string with the
|
|
service name of the port of the given B<BIO_ADDR>. If B<numeric>
|
|
is 1, the string will contain the port number. This only works
|
|
for B<BIO_ADDR> of the protocol families AF_INET and AF_INET6. The
|
|
returned string has been allocated on the heap and must be freed
|
|
with OPENSSL_free().
|
|
|
|
BIO_ADDR_path_string() returns a character string with the path
|
|
of the given B<BIO_ADDR>. This only works for B<BIO_ADDR> of the
|
|
protocol family AF_UNIX. The returned string has been allocated
|
|
on the heap and must be freed with OPENSSL_free().
|
|
|
|
=head1 RAW ADDRESSES
|
|
|
|
Both BIO_ADDR_rawmake() and BIO_ADDR_rawaddress() take a pointer to a
|
|
network byte order address of a specific site. Internally, those are
|
|
treated as a pointer to B<struct in_addr> (for B<AF_INET>), B<struct
|
|
in6_addr> (for B<AF_INET6>) or B<char *> (for B<AF_UNIX>), all
|
|
depending on the protocol family the address is for.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
The string producing functions BIO_ADDR_hostname_string(),
|
|
BIO_ADDR_service_string() and BIO_ADDR_path_string() will
|
|
return B<NULL> on error and leave an error indication on the
|
|
OpenSSL error stack.
|
|
|
|
All other functions described here return 0 or B<NULL> when the
|
|
information they should return isn't available.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<BIO_connect(3)>, L<BIO_s_connect(3)>
|