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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CDRIVER-3628] Non TXT/SRV records returned by res_nsearch are not filtered out</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-3628</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;Similar to &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2789&quot; title=&quot;Occasional crash with mongodb+srv URI on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2789&quot;&gt;&lt;del&gt;CDRIVER-2789&lt;/del&gt;&lt;/a&gt;, I observed that CNAME records could be returned by res_nsearch. I discovered this by accident when testing SRV polling but forgetting to override my DNS. Connecting to this URI:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongodb+srv://server.mongodb.com/?tls=true&amp;amp;tlsinsecure=true&amp;amp;heartbeatFrequencyMS=1000&amp;amp;directConnection=false&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Will attempt to do SRV and TXT lookup on &lt;tt&gt;_mongodb._tcp.server.mongodb.com&lt;/tt&gt;. This gave a strange error, looking like it was applying malformed text to the URI&apos;s options. When debugging it seems that the CNAME records returned were being applied as SRV / TXT records. Even querying with &lt;tt&gt;dig&lt;/tt&gt; shows that CNAME records are returned when SRV / TXT is requested:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ dig -t txt _mongodb._tcp.server.mongodb.com&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;;; ANSWER SECTION:&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;_mongodb._tcp.server.mongodb.com. 3600 IN CNAME	glb.mongodb.com.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This may be a misconfigured DNS server, but we should handle that gracefully. Let&apos;s apply the same fix of &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2789&quot; title=&quot;Occasional crash with mongodb+srv URI on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2789&quot;&gt;&lt;del&gt;CDRIVER-2789&lt;/del&gt;&lt;/a&gt; to the libresolv implementation of seedlist discovery and filter out non matching records.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1318392">CDRIVER-3628</key>
            <summary>Non TXT/SRV records returned by res_nsearch are not filtered out</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Apr 2020 22:52:52 +0000</created>
                <updated>Sat, 28 Oct 2023 11:28:47 +0000</updated>
                            <resolved>Thu, 7 May 2020 01:09:55 +0000</resolved>
                                                    <fixVersion>1.17.0-beta2</fixVersion>
                    <fixVersion>1.17.0</fixVersion>
                                    <component>network</component>
                    <component>uri</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3106171" author="xgen-internal-githook" created="Mon, 25 May 2020 21:14:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@mongodb.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3614&quot; title=&quot;SRV polling does not monitor newly found servers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3614&quot;&gt;&lt;del&gt;CDRIVER-3614&lt;/del&gt;&lt;/a&gt; fix SRV polling&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Reconcile hosts found in SRV polling with topology description.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3628&quot; title=&quot;Non TXT/SRV records returned by res_nsearch are not filtered out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3628&quot;&gt;&lt;del&gt;CDRIVER-3628&lt;/del&gt;&lt;/a&gt; do not process unmatched records returned by res_nsearch&lt;/li&gt;
	&lt;li&gt;Do not modify topology-&amp;gt;uri after topology_new(), since it is read&lt;br/&gt;
  from other threads outside of topology-&amp;gt;mutex.&lt;/li&gt;
	&lt;li&gt;Simplify _mongoc_client_get_rr. Do not modify an input URI.&lt;br/&gt;
  return a host list and string for found SRV / TXT records.&lt;br/&gt;
Branch: r1.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/40f095f05d5c50723f6821688aea7a684044cdc4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/40f095f05d5c50723f6821688aea7a684044cdc4&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="3072961" author="xgen-internal-githook" created="Wed, 6 May 2020 23:06:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@mongodb.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3614&quot; title=&quot;SRV polling does not monitor newly found servers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3614&quot;&gt;&lt;del&gt;CDRIVER-3614&lt;/del&gt;&lt;/a&gt; fix SRV polling&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Reconcile hosts found in SRV polling with topology description.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3628&quot; title=&quot;Non TXT/SRV records returned by res_nsearch are not filtered out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3628&quot;&gt;&lt;del&gt;CDRIVER-3628&lt;/del&gt;&lt;/a&gt; do not process unmatched records returned by res_nsearch&lt;/li&gt;
	&lt;li&gt;Do not modify topology-&amp;gt;uri after topology_new(), since it is read&lt;br/&gt;
  from other threads outside of topology-&amp;gt;mutex.&lt;/li&gt;
	&lt;li&gt;Simplify _mongoc_client_get_rr. Do not modify an input URI.&lt;br/&gt;
  return a host list and string for found SRV / TXT records.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/2fac166210c2449dcc29f97470ffc6fdf9ccf358&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/2fac166210c2449dcc29f97470ffc6fdf9ccf358&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="584564">CDRIVER-2789</issuekey>
        </issuelink>
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