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Add sd_is_socket_sockaddr (#4885)

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Fixes #1188.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-12-14 05:51:26 -05:00 committed by Lennart Poettering
parent 80d8b5bc1f
commit f6f372d2f4
5 changed files with 106 additions and 1 deletions
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5
Makefile-man.am
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@ -403,6 +403,7 @@ MANPAGES_ALIAS += \
man/sd_is_mq.3 \
man/sd_is_socket.3 \
man/sd_is_socket_inet.3 \
man/sd_is_socket_sockaddr.3 \
man/sd_is_socket_unix.3 \
man/sd_is_special.3 \
man/sd_journal.3 \
@ -757,6 +758,7 @@ man/sd_id128_t.3: man/sd-id128.3
man/sd_is_mq.3: man/sd_is_fifo.3
man/sd_is_socket.3: man/sd_is_fifo.3
man/sd_is_socket_inet.3: man/sd_is_fifo.3
man/sd_is_socket_sockaddr.3: man/sd_is_fifo.3
man/sd_is_socket_unix.3: man/sd_is_fifo.3
man/sd_is_special.3: man/sd_is_fifo.3
man/sd_journal.3: man/sd_journal_open.3
@ -1551,6 +1553,9 @@ man/sd_is_socket.html: man/sd_is_fifo.html
man/sd_is_socket_inet.html: man/sd_is_fifo.html
$(html-alias)
man/sd_is_socket_sockaddr.html: man/sd_is_fifo.html
$(html-alias)
man/sd_is_socket_unix.html: man/sd_is_fifo.html
$(html-alias)

30
man/sd_is_fifo.xml
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@ -48,6 +48,7 @@
<refname>sd_is_socket</refname>
<refname>sd_is_socket_inet</refname>
<refname>sd_is_socket_unix</refname>
<refname>sd_is_socket_sockaddr</refname>
<refname>sd_is_mq</refname>
<refname>sd_is_special</refname>
<refpurpose>Check the type of a file descriptor</refpurpose>
@ -80,6 +81,15 @@
<paramdef>uint16_t <parameter>port</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int <function>sd_is_socket_sockaddr</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
<paramdef>int <parameter>type</parameter></paramdef>
<paramdef>const struct sockaddr *<parameter>addr</parameter></paramdef>
<paramdef>unsigned <parameter>addr_len</parameter></paramdef>
<paramdef>int <parameter>listening</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int <function>sd_is_socket_unix</function></funcdef>
<paramdef>int <parameter>fd</parameter></paramdef>
@ -139,6 +149,18 @@
<constant>AF_UNSPEC</constant>, <constant>AF_INET</constant>, or
<constant>AF_INET6</constant>.</para>
<para><function>sd_is_socket_sockaddr()</function> is similar to
<function>sd_is_socket_inet()</function>, but checks if the socket is bound to the
address specified by <parameter>addr</parameter>. The
<structfield>family</structfield> specified by <parameter>addr</parameter> must be
either <constant>AF_INET</constant> or <constant>AF_INET6</constant> and
<parameter>addr_len</parameter> must be large enough for that family. If
<parameter>addr</parameter> specifies a non-zero port, it is also checked if the
socket is bound to this port. In addition, for IPv6, if <parameter>addr</parameter>
specifies non-zero <structfield>sin6_flowinfo</structfield> or
<structfield>sin6_scope_id</structfield>, it is checked if the socket has the same
values.</para>
<para><function>sd_is_socket_unix()</function> is similar to
<function>sd_is_socket()</function> but optionally checks the
<constant>AF_UNIX</constant> path the socket is bound to, unless
@ -193,7 +215,13 @@
<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>ip</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>ipv6</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fifo</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mq_overview</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
</para>
</refsect1>

1
src/libsystemd/libsystemd.sym
View File

@ -515,4 +515,5 @@ global:
LIBSYSTEMD_233 {
global:
sd_id128_get_machine_app_specific;
sd_is_socket_sockaddr;
} LIBSYSTEMD_232;

58
src/libsystemd/sd-daemon/sd-daemon.c
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@ -322,6 +322,64 @@ _public_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint
return 1;
}
_public_ int sd_is_socket_sockaddr(int fd, int type, const struct sockaddr* addr, unsigned addr_len, int listening) {
union sockaddr_union sockaddr = {};
socklen_t l = sizeof(sockaddr);
int r;
assert_return(fd >= 0, -EBADF);
assert_return(addr, -EINVAL);
assert_return(addr_len >= sizeof(sa_family_t), -ENOBUFS);
assert_return(IN_SET(addr->sa_family, AF_INET, AF_INET6), -EPFNOSUPPORT);
r = sd_is_socket_internal(fd, type, listening);
if (r <= 0)
return r;
if (getsockname(fd, &sockaddr.sa, &l) < 0)
return -errno;
if (l < sizeof(sa_family_t))
return -EINVAL;
if (sockaddr.sa.sa_family != addr->sa_family)
return 0;
if (sockaddr.sa.sa_family == AF_INET) {
const struct sockaddr_in *in = (const struct sockaddr_in *) addr;
if (l < sizeof(struct sockaddr_in) || addr_len < sizeof(struct sockaddr_in))
return -EINVAL;
if (in->sin_port != 0 &&
sockaddr.in.sin_port != in->sin_port)
return false;
return sockaddr.in.sin_addr.s_addr == in->sin_addr.s_addr;
} else {
const struct sockaddr_in6 *in = (const struct sockaddr_in6 *) addr;
if (l < sizeof(struct sockaddr_in6) || addr_len < sizeof(struct sockaddr_in6))
return -EINVAL;
if (in->sin6_port != 0 &&
sockaddr.in6.sin6_port != in->sin6_port)
return false;
if (in->sin6_flowinfo != 0 &&
sockaddr.in6.sin6_flowinfo != in->sin6_flowinfo)
return false;
if (in->sin6_scope_id != 0 &&
sockaddr.in6.sin6_scope_id != in->sin6_scope_id)
return false;
return memcmp(sockaddr.in6.sin6_addr.s6_addr, in->sin6_addr.s6_addr,
sizeof(in->sin6_addr.s6_addr)) == 0;
}
}
_public_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
union sockaddr_union sockaddr = {};
socklen_t l = sizeof(sockaddr);

13
src/systemd/sd-daemon.h
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@ -22,6 +22,7 @@
#include <inttypes.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "_sd-common.h"
@ -130,6 +131,18 @@ int sd_is_socket(int fd, int family, int type, int listening);
*/
int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port);
/*
Helper call for identifying a passed file descriptor. Returns 1 if the
file descriptor is an Internet socket of the specified type
(SOCK_DGRAM, SOCK_STREAM, ...), and if the address of the socket is
the same as the address specified by addr. The listening flag is used
the same way as in sd_is_socket(). Returns a negative errno style
error code on failure.
See sd_is_socket_sockaddr(3) for more information.
*/
int sd_is_socket_sockaddr(int fd, int type, const struct sockaddr* addr, unsigned addr_len, int listening);
/*
Helper call for identifying a passed file descriptor. Returns 1 if
the file descriptor is an AF_UNIX socket of the specified type