Added SNMP Support (#469)

* Added SNMP

* Update Readme.md

* Update layers.json

* Update layers.json

* Revert "Update layers.json"

This reverts commit a8c8b51.

* Revert "Update layers.json"

This reverts commit c795eaa.

* Update layers.json

* Apply suggestions from code review

---------

Co-authored-by: Tobias Nyholm <[email protected]>

Author: dnl4

Readme.md

@@ -86,6 +86,7 @@ functions:
 | Relay            | `${bref-extra:relay-php-81}`           |
 | Scout APM        | `${bref-extra:scoutapm-php-81}`        |
 | Scrypt           | `${bref-extra:scrypt-php-81}`          |
+| SNMP             | `${bref-extra:snmp-php-81}`            |
 | SPX              | `${bref-extra:spx-php-81}`             |
 | SSH2             | `${bref-extra:ssh2-php-81}`            |
 | Swoole           | `${bref-extra:swoole-php-81}`          |

layers/snmp/Dockerfile

@@ -0,0 +1,26 @@
+ARG PHP_VERSION
+ARG BREF_VERSION
+FROM bref/build-php-$PHP_VERSION:$BREF_VERSION AS ext
+
+RUN LD_LIBRARY_PATH=/lib:/lib64 yum -y install amazon-linux-extras
+RUN LD_LIBRARY_PATH=/lib:/lib64 amazon-linux-extras install epel -y
+RUN LD_LIBRARY_PATH=/lib:/lib64 yum -y update
+RUN LD_LIBRARY_PATH=/lib:/lib64 yum -y install net-snmp net-snmp-{devel,utils}
+
+WORKDIR ${PHP_BUILD_DIR}/ext/snmp
+RUN phpize
+RUN ./configure --with-libdir=lib64 --disable-static --with-sn
+RUN make -j `nproc` && make install
+
+RUN cp `php-config --extension-dir`/snmp.so /tmp/snmp.so
+RUN echo 'extension=snmp.so' > /tmp/ext.ini
+
+RUN php /bref/lib-copy/copy-dependencies.php /tmp/snmp.so /tmp/extension-libs
+
+# Build the final image with just the files we need
+FROM scratch
+
+# Copy things we installed to the final image
+COPY --from=ext /tmp/snmp.so /opt/bref/extensions/snmp.so
+COPY --from=ext /tmp/ext.ini /opt/bref/etc/php/conf.d/ext-snmp.ini
+COPY --from=ext /tmp/extension-libs /opt/lib

layers/snmp/config.json

@@ -0,0 +1,6 @@
+{
+    "php": [
+        "81",
+        "82"
+    ]
+}

layers/snmp/test.php

@@ -0,0 +1,8 @@
+<?php
+
+if (!function_exists($func = 'snmp2_real_walk')) {
+    echo sprintf('FAIL: Function "%s" does not exist.', $func).PHP_EOL;
+    exit(1);
+}
+
+exit(0);