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https://github.com/rsyslog/rsyslog.git
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c780d062c6
Simplify large-scale configs by auto-discovering receivers via DNS SRV records. This reduces per-host configuration and helps enterprise and container setups where target pools change over time. Impact: new param `targetSrv`; config now errors on conflicts or empty SRV answers; feature depends on resolver support. Before: omfwd required a static host/port list via `target`/`port`. After: `targetSrv` resolves `_syslog._udp|_tcp.<domain>` to build the target pool, honoring RFC 2782 priority/weight and reusing existing pool/load-balance logic. Technically, add action param `targetSrv` (mutually exclusive with `target`). During action init, perform SRV query via resolver (`res_nquery`, `ns_initparse`) and translate answers into host/port pairs. Preserve priority; randomly order same-priority entries using weights. If explicit ports were set, warn and ignore when `targetSrv` is used. Link rsyslogd with libresolv when available; configure checks for headers and `ns_initparse`. Provide clear error paths (config check fails) for missing support or empty SRV response. Docs cover usage and env overrides `RSYSLOG_DNS_SERVER`/`RSYSLOG_DNS_PORT`. Tests add a minimal UDP DNS server and cases for TCP/UDP success and error paths. Fixes: https://github.com/rsyslog/rsyslog/issues/6314 With the help of AI Agent: ChatGPT Codex
55 lines
1.4 KiB
Bash
Executable File
55 lines
1.4 KiB
Bash
Executable File
#!/bin/bash
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## @brief Validate SRV error handling and mutual exclusivity for omfwd targetSrv.
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. ${srcdir:=.}/diag.sh init
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check_command_available python3
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DNS_RECORDS="$RSYSLOG_DYNNAME.srv.json"
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DNS_PORT_FILE="$RSYSLOG_DYNNAME.dns_port"
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cat >"$DNS_RECORDS" <<EOFJSON
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{
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"SRV": {},
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"A": {}
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}
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EOFJSON
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python3 "$srcdir/dns_srv_mock.py" --port 0 --port-file "$DNS_PORT_FILE" --records "$DNS_RECORDS" &
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DNS_PID=$!
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wait_file_exists "$DNS_PORT_FILE"
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DNS_PORT=$(cat "$DNS_PORT_FILE")
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export RSYSLOG_DNS_SERVER=127.0.0.1
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export RSYSLOG_DNS_PORT="$DNS_PORT"
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export RES_OPTIONS="attempts:1 timeout:1"
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trap 'kill $DNS_PID 2>/dev/null; rm -f "$DNS_PORT_FILE" "$DNS_RECORDS"' EXIT
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# missing SRV records should fail config check
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generate_conf
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add_conf '
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module(load="builtin:omfwd")
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action(type="omfwd" targetSrv="nosrv.test" protocol="tcp")
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'
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if rsyslogd_config_check; then
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echo "Expected configuration failure when SRV lookup has no answers"
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exit 1
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fi
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# conflicting parameters should also fail
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generate_conf
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add_conf '
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module(load="builtin:omfwd")
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action(type="omfwd" targetSrv="nosrv.test" target="127.0.0.1" protocol="tcp")
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'
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if rsyslogd_config_check; then
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echo "Expected configuration failure when target and targetSrv are combined"
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exit 1
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fi
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kill $DNS_PID 2>/dev/null
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rm -f "$DNS_PORT_FILE" "$DNS_RECORDS"
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unset RSYSLOG_DNS_SERVER RSYSLOG_DNS_PORT
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unset RES_OPTIONS
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trap - EXIT
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exit_test
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