meta-openembedded: net-snmp: systemd support

Backported systemd-related commits from net-snmp's master branch (full
description in the systemd-support.patch file).

.service files slightly adapted from Fedora's.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

4 files changed, 1654 insertions, 2 deletions

diff --git a/meta-oe/recipes-extended/net-snmp/files/snmpd.service b/meta-oe/recipes-extended/net-snmp/files/snmpd.service
new file mode 100644
index 0000000..10a1eb2
--- /dev/null
+++ b/meta-oe/recipes-extended/net-snmp/files/snmpd.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Simple Network Management Protocol (SNMP) Daemon.
+After=syslog.target network.target
+
+[Service]
+Type=notify
+Environment=OPTIONS="-LS0-6d"
+EnvironmentFile=-/etc/default/snmpd
+ExecStart=/usr/sbin/snmpd $OPTIONS -f
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=multi-user.target
diff --git a/meta-oe/recipes-extended/net-snmp/files/snmptrapd.service b/meta-oe/recipes-extended/net-snmp/files/snmptrapd.service
new file mode 100644
index 0000000..951f9f2
--- /dev/null
+++ b/meta-oe/recipes-extended/net-snmp/files/snmptrapd.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Simple Network Management Protocol (SNMP) Trap Daemon.
+After=syslog.target network.target
+
+[Service]
+Type=notify
+Environment=OPTIONS="-Lsd"
+EnvironmentFile=-/etc/default/snmptrapd
+ExecStart=/usr/sbin/snmptrapd $OPTIONS -f
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=multi-user.target
diff --git a/meta-oe/recipes-extended/net-snmp/files/systemd-support.patch b/meta-oe/recipes-extended/net-snmp/files/systemd-support.patch
new file mode 100644
index 0000000..18955f2
--- /dev/null
+++ b/meta-oe/recipes-extended/net-snmp/files/systemd-support.patch
@@ -0,0 +1,1616 @@
+Systemd support backported from the master branch as of 23/04/2012 (post 5.7.1, pre 5.8).
+
+The following commits have been cherry-picked:
+
+19499c3c90bf9d7b2b9e5d08baa26cc6bba28a11
+fef6cddfdb94da1a6b1fb768af62918b80f11fd3
+0641e43c694c485cbbffef0556efc4641bd3ff50
+76530a89f1c8bbd0b63acce63e10d5d4812a1a16 (conflict resolved)
+bf108d7f1354f6276fc43c129963f2c49b9fc242
+74412748067c685e1d8ab6ed3bcc3ca9c2774844
+86132e3f1e6ef7b4e0b96d8fa24e37c81b71b0e0
+63557cf8986a33dba1d4429b583a901361052c4f
+
+Upstream-Status: Backport
+
+diff --git a/README.systemd b/README.systemd
+new file mode 100644
+index 0000000..f731851
+--- /dev/null
++++ b/README.systemd
+@@ -0,0 +1,41 @@
++README.systemd
++--------------
++Net-SNMP provides two daemons, which support systemd system manager. 
++See http://www.freedesktop.org/wiki/Software/systemd to learn how
++systemd works. Both socket activation and notification is supported by these
++daemons.
++
++To enable systemd support, the sources must be compiled with
++--with-systemd configure option.
++
++snmpd - The SNMP agent
++----------------------
++Socket activation od snmpd daemon is implemented, but it's discouraged.
++The reason is simple - snmpd not only listens and processes SNMP requests
++from network, but also gathers system statistics counters, sends traps and
++communicates with subagents. It even opens few netlink sockets.
++
++In other words, snmpd should run from system start to properly work.
++This can be done in two ways:
++1) either as snmpd service unit with 'Type=notification' and without a socket
++   unit
++2) or as snmpd service unit with 'Type=simple', appropriate socket socket unit
++   and the snmpd service enabled. This way systemd creates the snmpd listening
++   socket early during boot and passes the sockets to snmpd slightly later
++   (but still during machine boot). This way systemd can paralelize start of
++   services, which depend on snmpd. Admins must adjust the socket file manually,
++   depending if the snmpd support AgentX, IPv6, SMUX etc.
++
++snmpd should be started with '-f' command line parameter to disable forking -
++systemd does that for us automatically.
++
++
++snmptrapd - The trap processing daemon
++--------------------------------------
++snmptrapd supports full socket activation and also notification (if needed).
++Both 'Type=simple' (with appropriate socket unit) and 'Type=notify' services
++will work. Again, '-f' parameter should be provided on snmptrapd command line.
++
++If integration with SNMP agent using AgentX protocol is enabled, snmptrapd should
++start during boot and not after first SNMP trap arrives. Same rules as for snmpd
++applies then.
+\ No newline at end of file
+diff --git a/agent/snmpd.c b/agent/snmpd.c
+index b177d5b..08bdfc7 100644
+--- a/agent/snmpd.c
++++ b/agent/snmpd.c
+@@ -164,6 +164,10 @@ typedef long    fd_mask;
+ 
+ #endif
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ netsnmp_feature_want(logging_file)
+ netsnmp_feature_want(logging_stdio)
+ netsnmp_feature_want(logging_syslog)
+@@ -441,18 +445,28 @@ main(int argc, char *argv[])
+     int             agent_mode = -1;
+     char           *pid_file = NULL;
+     char            option_compatability[] = "-Le";
++#ifndef WIN32
++    int             prepared_sockets = 0;
++#endif
+ #if HAVE_GETPID
+     int fd;
+     FILE           *PID;
+ #endif
+ 
+ #ifndef WIN32
++#ifndef NETSNMP_NO_SYSYSTEMD
++    /* check if systemd has sockets for us and don't close them */
++    prepared_sockets = netsnmp_sd_listen_fds(0);
++#endif /* NETSNMP_NO_SYSYSTEMD */
++
+     /*
+      * close all non-standard file descriptors we may have
+      * inherited from the shell.
+      */
+-    for (i = getdtablesize() - 1; i > 2; --i) {
+-        (void) close(i);
++    if (!prepared_sockets) {
++        for (i = getdtablesize() - 1; i > 2; --i) {
++            (void) close(i);
++        }
+     }
+ #endif /* #WIN32 */
+     
+@@ -1100,6 +1114,19 @@ main(int argc, char *argv[])
+     netsnmp_addrcache_initialise();
+ 
+     /*
++     * Let systemd know we're up.
++     */
++#ifndef NETSNMP_NO_SYSTEMD
++    netsnmp_sd_notify(1, "READY=1\n");
++    if (prepared_sockets)
++        /*
++         * Clear the environment variable, we already processed all the sockets
++         * by now.
++         */
++        netsnmp_sd_listen_fds(1);
++#endif
++
++    /*
+      * Forever monitor the dest_port for incoming PDUs.  
+      */
+     DEBUGMSGTL(("snmpd/main", "We're up.  Starting to process data.\n"));
+diff --git a/apps/snmptrapd.c b/apps/snmptrapd.c
+index 1a52080..0857ae1 100644
+--- a/apps/snmptrapd.c
++++ b/apps/snmptrapd.c
+@@ -125,6 +125,10 @@ SOFTWARE.
+ 
+ #include <net-snmp/net-snmp-features.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ #ifndef BSD4_3
+ #define BSD4_2
+ #endif
+@@ -655,15 +659,24 @@ main(int argc, char *argv[])
+     int             agentx_subagent = 1;
+ #endif
+     netsnmp_trapd_handler *traph;
++#ifndef WIN32
++    int             prepared_sockets = 0;
++#endif
+ 
+ 
+ #ifndef WIN32
++#ifndef NETSNMP_NO_SYSTEMD
++    /* check if systemd has sockets for us and don't close them */
++    prepared_sockets = netsnmp_sd_listen_fds(0);
++#endif
+     /*
+      * close all non-standard file descriptors we may have
+      * inherited from the shell.
+      */
+-    for (i = getdtablesize() - 1; i > 2; --i) {
+-        (void) close(i);
++    if (!prepared_sockets) {
++        for (i = getdtablesize() - 1; i > 2; --i) {
++            (void) close(i);
++        }
+     }
+ #endif /* #WIN32 */
+     
+@@ -1311,6 +1324,19 @@ main(int argc, char *argv[])
+ #endif
+ #endif
+ 
++    /*
++     * Let systemd know we're up.
++     */
++#ifndef NETSNMP_NO_SYSTEMD
++    netsnmp_sd_notify(1, "READY=1\n");
++    if (prepared_sockets)
++        /*
++         * Clear the environment variable, we already processed all the sockets
++         * by now.
++         */
++        netsnmp_sd_listen_fds(1);
++#endif
++
+ #ifdef WIN32SERVICE
+     trapd_status = SNMPTRAPD_RUNNING;
+ #endif
+diff --git a/configure.d/config_modules_lib b/configure.d/config_modules_lib
+index b6609c1..5849072 100644
+--- a/configure.d/config_modules_lib
++++ b/configure.d/config_modules_lib
+@@ -53,6 +53,14 @@ if test "x$PARTIALTARGETOS" = "xmingw32" -o "x$PARTIALTARGETOS" = "xmingw32msvc"
+   other_ftobjs_list="$other_ftobjs_list winpipe.ft"
+ fi
+ 
++# Linux systemd
++if test "x$with_systemd" == "xyes"; then
++  other_src_list="$other_src_list sd-daemon.c"
++  other_objs_list="$other_objs_list sd-daemon.o"
++  other_lobjs_list="$other_lobjs_list sd-daemon.lo"
++  other_ftobjs_list="$other_ftobjs_list sd-daemon.ft"
++fi
++
+ AC_SUBST(other_src_list)
+ AC_SUBST(other_objs_list)
+ AC_SUBST(other_lobjs_list)
+diff --git a/configure.d/config_project_with_enable b/configure.d/config_project_with_enable
+index 8b46ad2..59d6d5c 100644
+--- a/configure.d/config_project_with_enable
++++ b/configure.d/config_project_with_enable
+@@ -689,6 +689,15 @@ if test "x$with_dummy_values" != "xyes"; then
+      data for])
+ fi
+ 
++NETSNMP_ARG_WITH(systemd,
++[  --with-systemd                 Provide systemd support. See README.systemd
++                                  for details.])
++# Define unless specifically suppressed (i.e., option defaults to false).
++if test "x$with_systemd" != "xyes"; then
++  AC_DEFINE(NETSNMP_NO_SYSTEMD, 1,
++    [If you don't want to integrate with systemd.])
++fi
++
+ NETSNMP_ARG_ENABLE(set-support,
+ [  --disable-set-support           Do not allow SNMP set requests.])
+ if test "x$enable_set_support" = "xno"; then
+diff --git a/dist/snmpd.service b/dist/snmpd.service
+new file mode 100644
+index 0000000..31391e5
+--- /dev/null
++++ b/dist/snmpd.service
+@@ -0,0 +1,18 @@
++#
++# SNMP agent service file for systemd
++#
++#
++# The service should be enabled, i.e. snmpd should start during machine boot.
++# Socket activation shall not be used. See README.systemd for details.
++
++[Unit]
++Description=Simple Network Management Protocol (SNMP) daemon.
++After=syslog.target network.target
++
++[Service]
++# Type=notify is also supported. It should be set when snmpd.socket is not used.
++Type=simple
++ExecStart=/usr/sbin/snmpd -f
++
++[Install]
++WantedBy=multi-user.target
+diff --git a/dist/snmpd.socket b/dist/snmpd.socket
+new file mode 100644
+index 0000000..7f3a2d9
+--- /dev/null
++++ b/dist/snmpd.socket
+@@ -0,0 +1,17 @@
++[Unit]
++Description=Socket listening for SNMP and AgentX messages
++
++[Socket]
++ListenDatagram=0.0.0.0:161
++# Uncomment other listening addresses as needed - TCP, UDP6, TCP6.
++# It must match listening addresses/ports defined in snmpd.service
++# or snmpd.conf.
++# ListenStream=0.0.0.0:161
++# ListenDatagram=[::]:161
++# ListenStream=[::]:161
++#
++# Uncomment AgentX socket if snmpd.conf enables AgentX protocol.
++# ListenStream=/var/agentx/master
++
++[Install]
++WantedBy=sockets.target
+diff --git a/dist/snmptrapd.service b/dist/snmptrapd.service
+new file mode 100644
+index 0000000..e88a5b4
+--- /dev/null
++++ b/dist/snmptrapd.service
+@@ -0,0 +1,16 @@
++#
++# SNMP trap-processing service file for systemd
++#
++
++[Unit]
++Description=Simple Network Management Protocol (SNMP) Trap daemon.
++After=syslog.target network.target
++
++[Service]
++# Type=notify is also supported. It should be set when snmptrapd.socket is not
++# used.
++Type=simple
++ExecStart=/usr/sbin/snmptrapd -f
++
++[Install]
++WantedBy=multi-user.target
+diff --git a/dist/snmptrapd.socket b/dist/snmptrapd.socket
+new file mode 100644
+index 0000000..0fc8a7c
+--- /dev/null
++++ b/dist/snmptrapd.socket
+@@ -0,0 +1,14 @@
++[Unit]
++Description=Socket listening for SNMP trap messages
++
++[Socket]
++ListenDatagram=0.0.0.0:162
++# Uncomment other listening addresses as needed - TCP, UDP6, TCP6.
++# It must match listening addresses/ports defined in snmptrapd.service
++# or snmptrapd.conf.
++# ListenStream=0.0.0.0:162
++# ListenDatagram=[::]:162
++# ListenStream=[::]:162
++
++[Install]
++WantedBy=sockets.target
+diff --git a/include/net-snmp/library/sd-daemon.h b/include/net-snmp/library/sd-daemon.h
+new file mode 100644
+index 0000000..85274c9
+--- /dev/null
++++ b/include/net-snmp/library/sd-daemon.h
+@@ -0,0 +1,290 @@
++/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
++
++#ifndef SNMPD_SD_DAEMON_H
++#define SNMPD_SD_DAEMON_H
++
++/***
++  Copyright 2010 Lennart Poettering
++
++  Permission is hereby granted, free of charge, to any person
++  obtaining a copy of this software and associated documentation files
++  (the "Software"), to deal in the Software without restriction,
++  including without limitation the rights to use, copy, modify, merge,
++  publish, distribute, sublicense, and/or sell copies of the Software,
++  and to permit persons to whom the Software is furnished to do so,
++  subject to the following conditions:
++
++  The above copyright notice and this permission notice shall be
++  included in all copies or substantial portions of the Software.
++
++  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
++  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
++  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
++  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
++  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
++  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
++  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
++  SOFTWARE.
++***/
++
++#ifdef HAVE_SYS_TYPES_H
++#include <sys/types.h>
++#endif
++#ifdef HAVE_INTTYPES_H
++#include <inttypes.h>
++#endif
++
++#ifdef __cplusplus
++extern "C" {
++#endif
++
++/*
++  Reference implementation of a few systemd related interfaces for
++  writing daemons. These interfaces are trivial to implement. To
++  simplify porting we provide this reference implementation.
++  Applications are welcome to reimplement the algorithms described
++  here if they do not want to include these two source files.
++
++  The following functionality is provided:
++
++  - Support for logging with log levels on stderr
++  - File descriptor passing for socket-based activation
++  - Daemon startup and status notification
++  - Detection of systemd boots
++
++  You may compile this with -DDISABLE_SYSTEMD to disable systemd
++  support. This makes all those calls NOPs that are directly related to
++  systemd (i.e. only sd_is_xxx() will stay useful).
++
++  Since this is drop-in code we don't want any of our symbols to be
++  exported in any case. Hence we declare hidden visibility for all of
++  them.
++
++  You may find an up-to-date version of these source files online:
++
++  http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.h
++  http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.c
++
++  This should compile on non-Linux systems, too, but with the
++  exception of the sd_is_xxx() calls all functions will become NOPs.
++
++  See sd-daemon(7) for more information.
++*/
++
++#ifndef _sd_printf_attr_
++#if __GNUC__ >= 4
++#define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
++#else
++#define _sd_printf_attr_(a,b)
++#endif
++#endif
++
++/*
++  Log levels for usage on stderr:
++
++          fprintf(stderr, SD_NOTICE "Hello World!\n");
++
++  This is similar to printk() usage in the kernel.
++*/
++#define SD_EMERG   "<0>"  /* system is unusable */
++#define SD_ALERT   "<1>"  /* action must be taken immediately */
++#define SD_CRIT    "<2>"  /* critical conditions */
++#define SD_ERR     "<3>"  /* error conditions */
++#define SD_WARNING "<4>"  /* warning conditions */
++#define SD_NOTICE  "<5>"  /* normal but significant condition */
++#define SD_INFO    "<6>"  /* informational */
++#define SD_DEBUG   "<7>"  /* debug-level messages */
++
++/* The first passed file descriptor is fd 3 */
++#define SD_LISTEN_FDS_START 3
++
++/*
++  Returns how many file descriptors have been passed, or a negative
++  errno code on failure. Optionally, removes the $LISTEN_FDS and
++  $LISTEN_PID file descriptors from the environment (recommended, but
++  problematic in threaded environments). If r is the return value of
++  this function you'll find the file descriptors passed as fds
++  SD_LISTEN_FDS_START to SD_LISTEN_FDS_START+r-1. Returns a negative
++  errno style error code on failure. This function call ensures that
++  the FD_CLOEXEC flag is set for the passed file descriptors, to make
++  sure they are not passed on to child processes. If FD_CLOEXEC shall
++  not be set, the caller needs to unset it after this call for all file
++  descriptors that are used.
++
++  See sd_listen_fds(3) for more information.
++*/
++int netsnmp_sd_listen_fds(int unset_environment);
++
++/*
++  Helper call for identifying a passed file descriptor. Returns 1 if
++  the file descriptor is a FIFO in the file system stored under the
++  specified path, 0 otherwise. If path is NULL a path name check will
++  not be done and the call only verifies if the file descriptor
++  refers to a FIFO. Returns a negative errno style error code on
++  failure.
++
++  See sd_is_fifo(3) for more information.
++*/
++int netsnmp_sd_is_fifo(int fd, const char *path);
++
++/*
++  Helper call for identifying a passed file descriptor. Returns 1 if
++  the file descriptor is a special character device on the file
++  system stored under the specified path, 0 otherwise.
++  If path is NULL a path name check will not be done and the call
++  only verifies if the file descriptor refers to a special character.
++  Returns a negative errno style error code on failure.
++
++  See sd_is_special(3) for more information.
++*/
++int netsnmp_sd_is_special(int fd, const char *path);
++
++/*
++  Helper call for identifying a passed file descriptor. Returns 1 if
++  the file descriptor is a socket of the specified family (AF_INET,
++  ...) and type (SOCK_DGRAM, SOCK_STREAM, ...), 0 otherwise. If
++  family is 0 a socket family check will not be done. If type is 0 a
++  socket type check will not be done and the call only verifies if
++  the file descriptor refers to a socket. If listening is > 0 it is
++  verified that the socket is in listening mode. (i.e. listen() has
++  been called) If listening is == 0 it is verified that the socket is
++  not in listening mode. If listening is < 0 no listening mode check
++  is done. Returns a negative errno style error code on failure.
++
++  See sd_is_socket(3) for more information.
++*/
++int netsnmp_sd_is_socket(int fd, int family, int type, int listening);
++
++/*
++  Helper call for identifying a passed file descriptor. Returns 1 if
++  the file descriptor is an Internet socket, of the specified family
++  (either AF_INET or AF_INET6) and the specified type (SOCK_DGRAM,
++  SOCK_STREAM, ...), 0 otherwise. If version is 0 a protocol version
++  check is not done. If type is 0 a socket type check will not be
++  done. If port is 0 a socket port check will not be done. 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_inet(3) for more information.
++*/
++int netsnmp_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 AF_UNIX socket of the specified type
++  (SOCK_DGRAM, SOCK_STREAM, ...) and path, 0 otherwise. If type is 0
++  a socket type check will not be done. If path is NULL a socket path
++  check will not be done. For normal AF_UNIX sockets set length to
++  0. For abstract namespace sockets set length to the length of the
++  socket name (including the initial 0 byte), and pass the full
++  socket path in path (including the initial 0 byte). 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_unix(3) for more information.
++*/
++int netsnmp_sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);
++
++/*
++  Informs systemd about changed daemon state. This takes a number of
++  newline separated environment-style variable assignments in a
++  string. The following variables are known:
++
++     READY=1      Tells systemd that daemon startup is finished (only
++                  relevant for services of Type=notify). The passed
++                  argument is a boolean "1" or "0". Since there is
++                  little value in signaling non-readiness the only
++                  value daemons should send is "READY=1".
++
++     STATUS=...   Passes a single-line status string back to systemd
++                  that describes the daemon state. This is free-from
++                  and can be used for various purposes: general state
++                  feedback, fsck-like programs could pass completion
++                  percentages and failing programs could pass a human
++                  readable error message. Example: "STATUS=Completed
++                  66% of file system check..."
++
++     ERRNO=...    If a daemon fails, the errno-style error code,
++                  formatted as string. Example: "ERRNO=2" for ENOENT.
++
++     BUSERROR=... If a daemon fails, the D-Bus error-style error
++                  code. Example: "BUSERROR=org.freedesktop.DBus.Error.TimedOut"
++
++     MAINPID=...  The main pid of a daemon, in case systemd did not
++                  fork off the process itself. Example: "MAINPID=4711"
++
++  Daemons can choose to send additional variables. However, it is
++  recommended to prefix variable names not listed above with X_.
++
++  Returns a negative errno-style error code on failure. Returns > 0
++  if systemd could be notified, 0 if it couldn't possibly because
++  systemd is not running.
++
++  Example: When a daemon finished starting up, it could issue this
++  call to notify systemd about it:
++
++     sd_notify(0, "READY=1");
++
++  See sd_notifyf() for more complete examples.
++
++  See sd_notify(3) for more information.
++*/
++int netsnmp_sd_notify(int unset_environment, const char *state);
++
++/*
++  Similar to sd_notify() but takes a format string.
++
++  Example 1: A daemon could send the following after initialization:
++
++     sd_notifyf(0, "READY=1\n"
++                   "STATUS=Processing requests...\n"
++                   "MAINPID=%lu",
++                   (unsigned long) getpid());
++
++  Example 2: A daemon could send the following shortly before
++  exiting, on failure:
++
++     sd_notifyf(0, "STATUS=Failed to start up: %s\n"
++                   "ERRNO=%i",
++                   strerror(errno),
++                   errno);
++
++  See sd_notifyf(3) for more information.
++*/
++int netsnmp_sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_attr_(2,3);
++
++/*
++  Returns > 0 if the system was booted with systemd. Returns < 0 on
++  error. Returns 0 if the system was not booted with systemd. Note
++  that all of the functions above handle non-systemd boots just
++  fine. You should NOT protect them with a call to this function. Also
++  note that this function checks whether the system, not the user
++  session is controlled by systemd. However the functions above work
++  for both user and system services.
++
++  See sd_booted(3) for more information.
++*/
++int netsnmp_sd_booted(void);
++
++/**
++ * Find an socket with given parameters. See man sd_is_socket_inet for
++ * description of the arguments.
++ *
++ * Returns the file descriptor if it is found, 0 otherwise.
++ */
++int netsnmp_sd_find_inet_socket(int family, int type, int listening, int port);
++
++/**
++ * Find an unix socket with given parameters. See man sd_is_socket_unix for
++ * description of the arguments.
++ *
++ * Returns the file descriptor if it is found, 0 otherwise.
++ */
++int
++netsnmp_sd_find_unix_socket(int type, int listening, const char *path);
++
++#ifdef __cplusplus
++}
++#endif
++
++#endif /* SNMPD_SD_DAEMON_H */
+diff --git a/snmplib/sd-daemon.c b/snmplib/sd-daemon.c
+new file mode 100644
+index 0000000..42dba29
+--- /dev/null
++++ b/snmplib/sd-daemon.c
+@@ -0,0 +1,532 @@
++/*
++ * Systemd integration parts.
++ *
++ * Most of this file is directly copied from systemd sources.
++ * Changes:
++ * - all functions were renamed to have netsnmp_ prefix
++ * - includes were  changed to match Net-SNMP style.
++ * - removed gcc export macros
++ * - removed POSIX message queues
++ */
++
++#include <net-snmp/net-snmp-config.h>
++#include <net-snmp/net-snmp-features.h>
++#include <net-snmp/types.h>
++#include <net-snmp/library/snmp_debug.h>
++
++#ifndef NETSNMP_NO_SYSTEMD
++
++/***
++  Copyright 2010 Lennart Poettering
++
++  Permission is hereby granted, free of charge, to any person
++  obtaining a copy of this software and associated documentation files
++  (the "Software"), to deal in the Software without restriction,
++  including without limitation the rights to use, copy, modify, merge,
++  publish, distribute, sublicense, and/or sell copies of the Software,
++  and to permit persons to whom the Software is furnished to do so,
++  subject to the following conditions:
++
++  The above copyright notice and this permission notice shall be
++  included in all copies or substantial portions of the Software.
++
++  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
++  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
++  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
++  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
++  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
++  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
++  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
++  SOFTWARE.
++***/
++
++#ifndef _GNU_SOURCE
++#define _GNU_SOURCE
++#endif
++
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <sys/socket.h>
++#include <sys/un.h>
++#include <sys/fcntl.h>
++#include <netinet/in.h>
++#include <stdlib.h>
++#include <errno.h>
++#include <unistd.h>
++#include <string.h>
++#include <stdarg.h>
++#include <stdio.h>
++#include <stddef.h>
++#include <limits.h>
++
++#include <net-snmp/library/sd-daemon.h>
++
++int netsnmp_sd_listen_fds(int unset_environment) {
++
++        int r, fd;
++        const char *e;
++        char *p = NULL;
++        unsigned long l;
++
++        if (!(e = getenv("LISTEN_PID"))) {
++                r = 0;
++                goto finish;
++        }
++
++        errno = 0;
++        l = strtoul(e, &p, 10);
++
++        if (errno != 0) {
++                r = -errno;
++                goto finish;
++        }
++
++        if (!p || *p || l <= 0) {
++                r = -EINVAL;
++                goto finish;
++        }
++
++        /* Is this for us? */
++        if (getpid() != (pid_t) l) {
++                r = 0;
++                goto finish;
++        }
++
++        if (!(e = getenv("LISTEN_FDS"))) {
++                r = 0;
++                goto finish;
++        }
++
++        errno = 0;
++        l = strtoul(e, &p, 10);
++
++        if (errno != 0) {
++                r = -errno;
++                goto finish;
++        }
++
++        if (!p || *p) {
++                r = -EINVAL;
++                goto finish;
++        }
++
++        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
++                int flags;
++
++                if ((flags = fcntl(fd, F_GETFD)) < 0) {
++                        r = -errno;
++                        goto finish;
++                }
++
++                if (flags & FD_CLOEXEC)
++                        continue;
++
++                if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
++                        r = -errno;
++                        goto finish;
++                }
++        }
++
++        r = (int) l;
++
++finish:
++        if (unset_environment) {
++                unsetenv("LISTEN_PID");
++                unsetenv("LISTEN_FDS");
++        }
++
++        return r;
++}
++
++int netsnmp_sd_is_fifo(int fd, const char *path) {
++        struct stat st_fd;
++
++        if (fd < 0)
++                return -EINVAL;
++
++        memset(&st_fd, 0, sizeof(st_fd));
++        if (fstat(fd, &st_fd) < 0)
++                return -errno;
++
++        if (!S_ISFIFO(st_fd.st_mode))
++                return 0;
++
++        if (path) {
++                struct stat st_path;
++
++                memset(&st_path, 0, sizeof(st_path));
++                if (stat(path, &st_path) < 0) {
++
++                        if (errno == ENOENT || errno == ENOTDIR)
++                                return 0;
++
++                        return -errno;
++                }
++
++                return
++                        st_path.st_dev == st_fd.st_dev &&
++                        st_path.st_ino == st_fd.st_ino;
++        }
++
++        return 1;
++}
++
++int netsnmp_sd_is_special(int fd, const char *path) {
++        struct stat st_fd;
++
++        if (fd < 0)
++                return -EINVAL;
++
++        if (fstat(fd, &st_fd) < 0)
++                return -errno;
++
++        if (!S_ISREG(st_fd.st_mode) && !S_ISCHR(st_fd.st_mode))
++                return 0;
++
++        if (path) {
++                struct stat st_path;
++
++                if (stat(path, &st_path) < 0) {
++
++                        if (errno == ENOENT || errno == ENOTDIR)
++                                return 0;
++
++                        return -errno;
++                }
++
++                if (S_ISREG(st_fd.st_mode) && S_ISREG(st_path.st_mode))
++                        return
++                                st_path.st_dev == st_fd.st_dev &&
++                                st_path.st_ino == st_fd.st_ino;
++                else if (S_ISCHR(st_fd.st_mode) && S_ISCHR(st_path.st_mode))
++                        return st_path.st_rdev == st_fd.st_rdev;
++                else
++                        return 0;
++        }
++
++        return 1;
++}
++
++static int sd_is_socket_internal(int fd, int type, int listening) {
++        struct stat st_fd;
++
++        if (fd < 0 || type < 0)
++                return -EINVAL;
++
++        if (fstat(fd, &st_fd) < 0)
++                return -errno;
++
++        if (!S_ISSOCK(st_fd.st_mode))
++                return 0;
++
++        if (type != 0) {
++                int other_type = 0;
++                socklen_t l = sizeof(other_type);
++
++                if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
++                        return -errno;
++
++                if (l != sizeof(other_type))
++                        return -EINVAL;
++
++                if (other_type != type)
++                        return 0;
++        }
++
++        if (listening >= 0) {
++                int accepting = 0;
++                socklen_t l = sizeof(accepting);
++
++                if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
++                        return -errno;
++
++                if (l != sizeof(accepting))
++                        return -EINVAL;
++
++                if (!accepting != !listening)
++                        return 0;
++        }
++
++        return 1;
++}
++
++union sockaddr_union {
++        struct sockaddr sa;
++        struct sockaddr_in in4;
++        struct sockaddr_in6 in6;
++        struct sockaddr_un un;
++        struct sockaddr_storage storage;
++};
++
++int netsnmp_sd_is_socket(int fd, int family, int type, int listening) {
++        int r;
++
++        if (family < 0)
++                return -EINVAL;
++
++        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
++                return r;
++
++        if (family > 0) {
++                union sockaddr_union sockaddr;
++                socklen_t l;
++
++                memset(&sockaddr, 0, sizeof(sockaddr));
++                l = sizeof(sockaddr);
++
++                if (getsockname(fd, &sockaddr.sa, &l) < 0)
++                        return -errno;
++
++                if (l < sizeof(sa_family_t))
++                        return -EINVAL;
++
++                return sockaddr.sa.sa_family == family;
++        }
++
++        return 1;
++}
++
++int netsnmp_sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
++        union sockaddr_union sockaddr;
++        socklen_t l;
++        int r;
++
++        if (family != 0 && family != AF_INET && family != AF_INET6)
++                return -EINVAL;
++
++        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
++                return r;
++
++        memset(&sockaddr, 0, sizeof(sockaddr));
++        l = sizeof(sockaddr);
++
++        if (getsockname(fd, &sockaddr.sa, &l) < 0)
++                return -errno;
++
++        if (l < sizeof(sa_family_t))
++                return -EINVAL;
++
++        if (sockaddr.sa.sa_family != AF_INET &&
++            sockaddr.sa.sa_family != AF_INET6)
++                return 0;
++
++        if (family > 0)
++                if (sockaddr.sa.sa_family != family)
++                        return 0;
++
++        if (port > 0) {
++                if (sockaddr.sa.sa_family == AF_INET) {
++                        if (l < sizeof(struct sockaddr_in))
++                                return -EINVAL;
++
++                        return htons(port) == sockaddr.in4.sin_port;
++                } else {
++                        if (l < sizeof(struct sockaddr_in6))
++                                return -EINVAL;
++
++                        return htons(port) == sockaddr.in6.sin6_port;
++                }
++        }
++
++        return 1;
++}
++
++int netsnmp_sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
++        union sockaddr_union sockaddr;
++        socklen_t l;
++        int r;
++
++        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
++                return r;
++
++        memset(&sockaddr, 0, sizeof(sockaddr));
++        l = sizeof(sockaddr);
++
++        if (getsockname(fd, &sockaddr.sa, &l) < 0)
++                return -errno;
++
++        if (l < sizeof(sa_family_t))
++                return -EINVAL;
++
++        if (sockaddr.sa.sa_family != AF_UNIX)
++                return 0;
++
++        if (path) {
++                if (length <= 0)
++                        length = strlen(path);
++
++                if (length <= 0)
++                        /* Unnamed socket */
++                        return l == offsetof(struct sockaddr_un, sun_path);
++
++                if (path[0])
++                        /* Normal path socket */
++                        return
++                                (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) &&
++                                memcmp(path, sockaddr.un.sun_path, length+1) == 0;
++                else
++                        /* Abstract namespace socket */
++                        return
++                                (l == offsetof(struct sockaddr_un, sun_path) + length) &&
++                                memcmp(path, sockaddr.un.sun_path, length) == 0;
++        }
++
++        return 1;
++}
++
++int netsnmp_sd_notify(int unset_environment, const char *state) {
++        int fd = -1, r;
++        struct msghdr msghdr;
++        struct iovec iovec;
++        union sockaddr_union sockaddr;
++        const char *e;
++
++        if (!state) {
++                r = -EINVAL;
++                goto finish;
++        }
++
++        if (!(e = getenv("NOTIFY_SOCKET")))
++                return 0;
++
++        /* Must be an abstract socket, or an absolute path */
++        if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
++                r = -EINVAL;
++                goto finish;
++        }
++
++        if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
++                r = -errno;
++                goto finish;
++        }
++
++        memset(&sockaddr, 0, sizeof(sockaddr));
++        sockaddr.sa.sa_family = AF_UNIX;
++        strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
++
++        if (sockaddr.un.sun_path[0] == '@')
++                sockaddr.un.sun_path[0] = 0;
++
++        memset(&iovec, 0, sizeof(iovec));
++        iovec.iov_base = (char *)state;
++        iovec.iov_len = strlen(state);
++
++        memset(&msghdr, 0, sizeof(msghdr));
++        msghdr.msg_name = &sockaddr;
++        msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
++
++        if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
++                msghdr.msg_namelen = sizeof(struct sockaddr_un);
++
++        msghdr.msg_iov = &iovec;
++        msghdr.msg_iovlen = 1;
++
++        if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
++                r = -errno;
++                goto finish;
++        }
++
++        r = 1;
++
++finish:
++        if (unset_environment)
++                unsetenv("NOTIFY_SOCKET");
++
++        if (fd >= 0)
++                close(fd);
++
++        return r;
++}
++
++int netsnmp_sd_notifyf(int unset_environment, const char *format, ...) {
++        va_list ap;
++        char *p = NULL;
++        int r;
++
++        va_start(ap, format);
++        r = vasprintf(&p, format, ap);
++        va_end(ap);
++
++        if (r < 0 || !p)
++                return -ENOMEM;
++
++        r = netsnmp_sd_notify(unset_environment, p);
++        free(p);
++
++        return r;
++}
++
++int netsnmp_sd_booted(void) {
++        struct stat a, b;
++
++        /* We simply test whether the systemd cgroup hierarchy is
++         * mounted */
++
++        if (lstat("/sys/fs/cgroup", &a) < 0)
++                return 0;
++
++        if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
++                return 0;
++
++        return a.st_dev != b.st_dev;
++}
++
++/* End of original sd-daemon.c from systemd sources */
++
++int
++netsnmp_sd_find_inet_socket(int family, int type, int listening, int port)
++{
++    int count, fd;
++
++    count = netsnmp_sd_listen_fds(0);
++    if (count <= 0) {
++        DEBUGMSGTL(("systemd:find_inet_socket", "No LISTEN_FDS found.\n"));
++        return 0;
++    }
++    DEBUGMSGTL(("systemd:find_inet_socket", "LISTEN_FDS reports %d sockets.\n",
++            count));
++
++    for (fd = 3; fd < 3+count; fd++) {
++        int rc = netsnmp_sd_is_socket_inet(fd, family, type, listening, port);
++        if (rc < 0)
++            DEBUGMSGTL(("systemd:find_inet_socket",
++                    "sd_is_socket_inet error: %d\n", rc));
++        if (rc > 0) {
++            DEBUGMSGTL(("systemd:find_inet_socket",
++                    "Found the socket in LISTEN_FDS\n"));
++            return fd;
++        }
++    }
++    DEBUGMSGTL(("systemd:find_inet_socket", "Socket not found in LISTEN_FDS\n"));
++    return 0;
++}
++
++int
++netsnmp_sd_find_unix_socket(int type, int listening, const char *path)
++{
++    int count, fd;
++
++    count = netsnmp_sd_listen_fds(0);
++    if (count <= 0) {
++        DEBUGMSGTL(("systemd:find_unix_socket", "No LISTEN_FDS found.\n"));
++        return 0;
++    }
++    DEBUGMSGTL(("systemd:find_unix_socket", "LISTEN_FDS reports %d sockets.\n",
++            count));
++
++    for (fd = 3; fd < 3+count; fd++) {
++        int rc = netsnmp_sd_is_socket_unix(fd, type, listening, path, 0);
++        if (rc < 0)
++            DEBUGMSGTL(("systemd:find_unix_socket",
++                    "netsnmp_sd_is_socket_unix error: %d\n", rc));
++        if (rc > 0) {
++            DEBUGMSGTL(("systemd:find_unix_socket",
++                    "Found the socket in LISTEN_FDS\n"));
++            return fd;
++        }
++    }
++    DEBUGMSGTL(("systemd:find_unix_socket", "Socket not found in LISTEN_FDS\n"));
++    return 0;
++}
++
++#endif /* ! NETSNMP_NO_SYSTEMD */
+diff --git a/snmplib/transports/snmpTCPDomain.c b/snmplib/transports/snmpTCPDomain.c
+index b8bdba4..ab7f3a1 100644
+--- a/snmplib/transports/snmpTCPDomain.c
++++ b/snmplib/transports/snmpTCPDomain.c
+@@ -43,6 +43,10 @@
+ #include <net-snmp/library/snmpTCPBaseDomain.h>
+ #include <net-snmp/library/tools.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ /*
+  * needs to be in sync with the definitions in snmplib/snmpUDPDomain.c
+  * and perl/agent/agent.xs
+@@ -149,6 +153,7 @@ netsnmp_tcp_transport(struct sockaddr_in *addr, int local)
+     netsnmp_transport *t = NULL;
+     netsnmp_udp_addr_pair *addr_pair = NULL;
+     int rc = 0;
++    int socket_initialized = 0;
+ 
+ #ifdef NETSNMP_NO_LISTEN_SUPPORT
+     if (local)
+@@ -178,7 +183,19 @@ netsnmp_tcp_transport(struct sockaddr_in *addr, int local)
+     t->domain_length =
+         sizeof(netsnmp_snmpTCPDomain) / sizeof(netsnmp_snmpTCPDomain[0]);
+ 
+-    t->sock = socket(PF_INET, SOCK_STREAM, 0);
++#ifndef NETSNMP_NO_SYSTEMD
++    /*
++     * Maybe the socket was already provided by systemd...
++     */
++    if (local) {
++        t->sock = netsnmp_sd_find_inet_socket(PF_INET, SOCK_STREAM, 1,
++                ntohs(addr->sin_port));
++        if (t->sock)
++            socket_initialized = 1;
++    }
++#endif
++    if (!socket_initialized)
++        t->sock = socket(PF_INET, SOCK_STREAM, 0);
+     if (t->sock < 0) {
+         netsnmp_transport_free(t);
+         return NULL;
+@@ -215,11 +232,13 @@ netsnmp_tcp_transport(struct sockaddr_in *addr, int local)
+         setsockopt(t->sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt,
+ 		   sizeof(opt));
+ 
+-        rc = bind(t->sock, (struct sockaddr *)addr, sizeof(struct sockaddr));
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = bind(t->sock, (struct sockaddr *)addr, sizeof(struct sockaddr));
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+ 
+         /*
+@@ -235,12 +254,13 @@ netsnmp_tcp_transport(struct sockaddr_in *addr, int local)
+         /*
+          * Now sit here and wait for connections to arrive.  
+          */
+-
+-        rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+         
+         /*
+diff --git a/snmplib/transports/snmpTCPIPv6Domain.c b/snmplib/transports/snmpTCPIPv6Domain.c
+index 3c96856..305a861 100644
+--- a/snmplib/transports/snmpTCPIPv6Domain.c
++++ b/snmplib/transports/snmpTCPIPv6Domain.c
+@@ -49,6 +49,10 @@
+ #include <net-snmp/library/snmpTCPBaseDomain.h>
+ #include <net-snmp/library/tools.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ #include "inet_ntop.h"
+ 
+ oid netsnmp_TCPIPv6Domain[] = { TRANSPORT_DOMAIN_TCP_IPV6 };
+@@ -140,6 +144,8 @@ netsnmp_tcp6_transport(struct sockaddr_in6 *addr, int local)
+ {
+     netsnmp_transport *t = NULL;
+     int             rc = 0;
++    char           *str = NULL;
++    int             socket_initialized = 0;
+ 
+ #ifdef NETSNMP_NO_LISTEN_SUPPORT
+     if (local)
+@@ -174,7 +180,19 @@ netsnmp_tcp6_transport(struct sockaddr_in6 *addr, int local)
+     t->domain = netsnmp_TCPIPv6Domain;
+     t->domain_length = sizeof(netsnmp_TCPIPv6Domain) / sizeof(oid);
+ 
+-    t->sock = socket(PF_INET6, SOCK_STREAM, 0);
++#ifndef NETSNMP_NO_SYSTEMD
++    /*
++     * Maybe the socket was already provided by systemd...
++     */
++    if (local) {
++        t->sock = netsnmp_sd_find_inet_socket(PF_INET6, SOCK_STREAM, 1,
++                ntohs(addr->sin6_port));
++        if (t->sock)
++            socket_initialized = 1;
++    }
++#endif
++    if (!socket_initialized)
++        t->sock = socket(PF_INET6, SOCK_STREAM, 0);
+     if (t->sock < 0) {
+         netsnmp_transport_free(t);
+         return NULL;
+@@ -220,12 +238,14 @@ netsnmp_tcp6_transport(struct sockaddr_in6 *addr, int local)
+ 
+         setsockopt(t->sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt));
+ 
+-        rc = bind(t->sock, (struct sockaddr *) addr,
+-		  sizeof(struct sockaddr_in6));
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = bind(t->sock, (struct sockaddr *) addr,
++                    sizeof(struct sockaddr_in6));
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+ 
+         /*
+@@ -242,11 +262,13 @@ netsnmp_tcp6_transport(struct sockaddr_in6 *addr, int local)
+          * Now sit here and wait for connections to arrive.  
+          */
+ 
+-        rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+         
+         /*
+diff --git a/snmplib/transports/snmpUDPIPv4BaseDomain.c b/snmplib/transports/snmpUDPIPv4BaseDomain.c
+index c67427b..428e6d6 100644
+--- a/snmplib/transports/snmpUDPIPv4BaseDomain.c
++++ b/snmplib/transports/snmpUDPIPv4BaseDomain.c
+@@ -40,6 +40,10 @@
+ 
+ #include <net-snmp/library/snmpSocketBaseDomain.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ #if (defined(linux) && defined(IP_PKTINFO)) \
+     || defined(IP_RECVDSTADDR) && HAVE_STRUCT_MSGHDR_MSG_CONTROL \
+                                && HAVE_STRUCT_MSGHDR_MSG_FLAGS
+@@ -67,6 +71,7 @@ netsnmp_udpipv4base_transport(struct sockaddr_in *addr, int local)
+     char           *client_socket = NULL;
+     netsnmp_indexed_addr_pair addr_pair;
+     socklen_t       local_addr_len;
++    int             socket_initialized = 0;
+ 
+ #ifdef NETSNMP_NO_LISTEN_SUPPORT
+     if (local)
+@@ -91,7 +96,19 @@ netsnmp_udpipv4base_transport(struct sockaddr_in *addr, int local)
+         free(str);
+     }
+ 
+-    t->sock = socket(PF_INET, SOCK_DGRAM, 0);
++#ifndef NETSNMP_NO_SYSTEMD
++    /*
++     * Maybe the socket was already provided by systemd...
++     */
++    if (local) {
++        t->sock = netsnmp_sd_find_inet_socket(PF_INET, SOCK_DGRAM, -1,
++                ntohs(addr->sin_port));
++        if (t->sock)
++            socket_initialized = 1;
++    }
++#endif
++    if (!socket_initialized)
++        t->sock = socket(PF_INET, SOCK_DGRAM, 0);
+     DEBUGMSGTL(("UDPBase", "openned socket %d as local=%d\n", t->sock, local)); 
+     if (t->sock < 0) {
+         netsnmp_transport_free(t);
+@@ -141,12 +158,14 @@ netsnmp_udpipv4base_transport(struct sockaddr_in *addr, int local)
+             DEBUGMSGTL(("netsnmp_udp", "set IP_RECVDSTADDR\n"));
+         }
+ #endif
+-        rc = bind(t->sock, (struct sockaddr *) addr,
+-                  sizeof(struct sockaddr));
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = bind(t->sock, (struct sockaddr *) addr,
++                    sizeof(struct sockaddr));
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+         t->data = NULL;
+         t->data_length = 0;
+diff --git a/snmplib/transports/snmpUDPIPv6Domain.c b/snmplib/transports/snmpUDPIPv6Domain.c
+index b3eaae4..35b617f 100644
+--- a/snmplib/transports/snmpUDPIPv6Domain.c
++++ b/snmplib/transports/snmpUDPIPv6Domain.c
+@@ -67,6 +67,10 @@ static const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+ #include <net-snmp/library/snmpSocketBaseDomain.h>
+ #include <net-snmp/library/tools.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ #include "inet_ntop.h"
+ #include "inet_pton.h"
+ 
+@@ -190,6 +194,8 @@ netsnmp_udp6_transport(struct sockaddr_in6 *addr, int local)
+ {
+     netsnmp_transport *t = NULL;
+     int             rc = 0;
++    char           *str = NULL;
++    int             socket_initialized = 0;
+ 
+ #ifdef NETSNMP_NO_LISTEN_SUPPORT
+     if (local)
+@@ -217,7 +223,19 @@ netsnmp_udp6_transport(struct sockaddr_in6 *addr, int local)
+     t->domain_length =
+         sizeof(netsnmp_UDPIPv6Domain) / sizeof(netsnmp_UDPIPv6Domain[0]);
+ 
+-    t->sock = socket(PF_INET6, SOCK_DGRAM, 0);
++#ifndef NETSNMP_NO_SYSTEMD
++    /*
++     * Maybe the socket was already provided by systemd...
++     */
++    if (local) {
++        t->sock = netsnmp_sd_find_inet_socket(PF_INET6, SOCK_DGRAM, -1,
++                ntohs(addr->sin6_port));
++        if (t->sock)
++            socket_initialized = 1;
++    }
++#endif
++    if (!socket_initialized)
++        t->sock = socket(PF_INET6, SOCK_DGRAM, 0);
+     if (t->sock < 0) {
+         netsnmp_transport_free(t);
+         return NULL;
+@@ -242,13 +260,14 @@ netsnmp_udp6_transport(struct sockaddr_in6 *addr, int local)
+ 	  } 
+ 	}
+ #endif
+-
+-        rc = bind(t->sock, (struct sockaddr *) addr,
+-		  sizeof(struct sockaddr_in6));
+-        if (rc != 0) {
+-            netsnmp_socketbase_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = bind(t->sock, (struct sockaddr *) addr,
++                    sizeof(struct sockaddr_in6));
++            if (rc != 0) {
++                netsnmp_socketbase_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+         t->local = (unsigned char*)malloc(18);
+         if (t->local == NULL) {
+diff --git a/snmplib/transports/snmpUnixDomain.c b/snmplib/transports/snmpUnixDomain.c
+index 674dc2b..9f3d3cb 100644
+--- a/snmplib/transports/snmpUnixDomain.c
++++ b/snmplib/transports/snmpUnixDomain.c
+@@ -37,6 +37,10 @@
+ #include <net-snmp/library/system.h> /* mkdirhier */
+ #include <net-snmp/library/tools.h>
+ 
++#ifndef NETSNMP_NO_SYSTEMD
++#include <net-snmp/library/sd-daemon.h>
++#endif
++
+ netsnmp_feature_child_of(transport_unix_socket_all, transport_all)
+ netsnmp_feature_child_of(unix_socket_paths, transport_unix_socket_all)
+ 
+@@ -295,6 +299,8 @@ netsnmp_unix_transport(struct sockaddr_un *addr, int local)
+     netsnmp_transport *t = NULL;
+     sockaddr_un_pair *sup = NULL;
+     int             rc = 0;
++    char           *string = NULL;
++    int             socket_initialized = 0;
+ 
+ #ifdef NETSNMP_NO_LISTEN_SUPPORT
+     /* SPECIAL CIRCUMSTANCE: We still want AgentX to be able to operate,
+@@ -333,7 +339,18 @@ netsnmp_unix_transport(struct sockaddr_un *addr, int local)
+     t->data_length = sizeof(sockaddr_un_pair);
+     sup = (sockaddr_un_pair *) t->data;
+ 
+-    t->sock = socket(PF_UNIX, SOCK_STREAM, 0);
++#ifndef NETSNMP_NO_SYSTEMD
++    /*
++     * Maybe the socket was already provided by systemd...
++     */
++    if (local) {
++        t->sock = netsnmp_sd_find_unix_socket(SOCK_STREAM, 1, addr->sun_path);
++        if (t->sock)
++            socket_initialized = 1;
++    }
++#endif
++    if (!socket_initialized)
++        t->sock = socket(PF_UNIX, SOCK_STREAM, 0);
+     if (t->sock < 0) {
+         netsnmp_transport_free(t);
+         return NULL;
+@@ -357,25 +374,26 @@ netsnmp_unix_transport(struct sockaddr_un *addr, int local)
+ 
+         t->flags |= NETSNMP_TRANSPORT_FLAG_LISTEN;
+ 
+-        unlink(addr->sun_path);
+-        rc = bind(t->sock, (struct sockaddr *) addr, SUN_LEN(addr));
+-
+-        if (rc != 0 && errno == ENOENT && create_path) {
+-            rc = mkdirhier(addr->sun_path, create_mode, 1);
++        if (!socket_initialized) {
++            unlink(addr->sun_path);
++            rc = bind(t->sock, (struct sockaddr *) addr, SUN_LEN(addr));
++            if (rc != 0 && errno == ENOENT && create_path) {
++                rc = mkdirhier(addr->sun_path, create_mode, 1);
++                if (rc != 0) {
++                    netsnmp_unix_close(t);
++                    netsnmp_transport_free(t);
++                    return NULL;
++                }
++                rc = bind(t->sock, (struct sockaddr *) addr, SUN_LEN(addr));
++            }
+             if (rc != 0) {
++                DEBUGMSGTL(("netsnmp_unix_transport",
++                        "couldn't bind \"%s\", errno %d (%s)\n",
++                        addr->sun_path, errno, strerror(errno)));
+                 netsnmp_unix_close(t);
+                 netsnmp_transport_free(t);
+                 return NULL;
+             }
+-            rc = bind(t->sock, (struct sockaddr *) addr, SUN_LEN(addr));
+-        }
+-        if (rc != 0) {
+-            DEBUGMSGTL(("netsnmp_unix_transport",
+-                        "couldn't bind \"%s\", errno %d (%s)\n",
+-                        addr->sun_path, errno, strerror(errno)));
+-            netsnmp_unix_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
+         }
+ 
+         /*
+@@ -391,16 +409,17 @@ netsnmp_unix_transport(struct sockaddr_un *addr, int local)
+          * Now sit here and listen for connections to arrive.
+          */
+ 
+-        rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
+-        if (rc != 0) {
+-            DEBUGMSGTL(("netsnmp_unix_transport",
+-                        "couldn't listen to \"%s\", errno %d (%s)\n",
+-                        addr->sun_path, errno, strerror(errno)));
+-            netsnmp_unix_close(t);
+-            netsnmp_transport_free(t);
+-            return NULL;
++        if (!socket_initialized) {
++            rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN);
++            if (rc != 0) {
++                DEBUGMSGTL(("netsnmp_unix_transport",
++                            "couldn't listen to \"%s\", errno %d (%s)\n",
++                            addr->sun_path, errno, strerror(errno)));
++                netsnmp_unix_close(t);
++                netsnmp_transport_free(t);
++                return NULL;
++            }
+         }
+-
+     } else {
+         t->remote = (u_char *)malloc(strlen(addr->sun_path));
+         if (t->remote == NULL) {
+diff --git a/win32/libsnmp/Makefile.in b/win32/libsnmp/Makefile.in
+index 98d83c8..dd5689b 100644
+--- a/win32/libsnmp/Makefile.in
++++ b/win32/libsnmp/Makefile.in
+@@ -42,6 +42,7 @@ LIB32_OBJS= \
+ 	"$(INTDIR)\read_config.obj" \
+ 	"$(INTDIR)\readdir.obj" \
+ 	"$(INTDIR)\scapi.obj" \
++	"$(INTDIR)\sd-daemon.obj" \
+ 	"$(INTDIR)\snmp-tc.obj" \
+ 	"$(INTDIR)\snmp.obj" \
+ 	"$(INTDIR)\snmpCallbackDomain.obj" \
+@@ -307,6 +308,12 @@ SOURCE=..\..\snmplib\scapi.c
+ 	$(CPP) $(CPP_PROJ) $(SOURCE)
+ 
+ 
++SOURCE=..\..\snmplib\sd-daemon.c
++
++"$(INTDIR)\sd-daemon.obj" : $(SOURCE) "$(INTDIR)"
++	$(CPP) $(CPP_PROJ) $(SOURCE)
++
++
+ SOURCE="..\..\snmplib\snmp-tc.c"
+ 
+ "$(INTDIR)\snmp-tc.obj" : $(SOURCE) "$(INTDIR)"
+diff --git a/win32/net-snmp/net-snmp-config.h b/win32/net-snmp/net-snmp-config.h
+index 7791ee0..1eccf42 100644
+--- a/win32/net-snmp/net-snmp-config.h
++++ b/win32/net-snmp/net-snmp-config.h
+@@ -1705,6 +1705,8 @@ enum {
+ #define DMALLOC_FUNC_CHECK
+ #endif
+ 
++#define NETSNMP_NO_SYSTEMD
++
+ /* #undef NETSNMP_ENABLE_LOCAL_SMUX */
+ 
+ /* define if agentx transport is to use domain sockets only */
+diff --git a/win32/net-snmp/net-snmp-config.h.in b/win32/net-snmp/net-snmp-config.h.in
+index 5215865..1607bfa 100644
+--- a/win32/net-snmp/net-snmp-config.h.in
++++ b/win32/net-snmp/net-snmp-config.h.in
+@@ -1705,6 +1705,8 @@ enum {
+ #define DMALLOC_FUNC_CHECK
+ #endif
+ 
++#define NETSNMP_NO_SYSTEMD
++
+ /* #undef NETSNMP_ENABLE_LOCAL_SMUX */
+ 
+ /* define if agentx transport is to use domain sockets only */
diff --git a/meta-oe/recipes-extended/net-snmp/net-snmp_5.7.1.bb b/meta-oe/recipes-extended/net-snmp/net-snmp_5.7.1.bb
index 9cbc5a8..b2a9786 100644
--- a/meta-oe/recipes-extended/net-snmp/net-snmp_5.7.1.bb
+++ b/meta-oe/recipes-extended/net-snmp/net-snmp_5.7.1.bb
@@ -1,17 +1,25 @@
 require net-snmp.inc
-PR = "${INC_PR}.2"
+inherit systemd
+
+PR = "${INC_PR}.3"
 LIC_FILES_CHKSUM = "file://README;beginline=3;endline=8;md5=7f7f00ba639ac8e8deb5a622ea24634e"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/net-snmp/net-snmp-${PV}.tar.gz \
         file://sync-with-5.7-branch.patch \
         file://libnl-3-support.patch \
+        file://systemd-support.patch \
+        file://snmpd.service \
+        file://snmptrapd.service \
         file://init \
         file://snmpd.conf \
         file://snmptrapd.conf"
 
-EXTRA_OECONF += "--disable-embedded-perl --with-perl-modules=no"
+EXTRA_OECONF += "--disable-embedded-perl --with-perl-modules=no --with-systemd "
 EXTRA_OEMAKE = "INSTALL_PREFIX=${D}"
 
+SYSTEMD_PACKAGES = "${PN}-server-systemd"
+SYSTEMD_SERVICE_${PN}-server-systemd = "snmpd.service snmptrapd.service"
+
 do_configure_prepend() {
         gnu-configize -f
         # We better change sources and re-autoconf here, but
@@ -26,3 +34,5 @@ CCACHE = ""
 
 SRC_URI[md5sum] = "c95d08fd5d93df0c11a2e1bdf0e01e0b"
 SRC_URI[sha256sum] = "7c71c9650c65b715356547e20ca2dbe6313944278af8cc19c32a5337f46b181f"
+
+RDEPENDS_${PN}-server-systemd = "${PN}-server"