1 // vim: ts=4 sw=4 noet:
3 --------------------------------------------------------------------------------
4 Copyright (c) 2018-2019 AT&T Intellectual Property.
6 Licensed under the Apache License, Version 2.0 (the "License");
7 you may not use this file except in compliance with the License.
8 You may obtain a copy of the License at
10 http://www.apache.org/licenses/LICENSE-2.0
12 Unless required by applicable law or agreed to in writing, software
13 distributed under the License is distributed on an "AS IS" BASIS,
14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 See the License for the specific language governing permissions and
16 limitations under the License.
17 --------------------------------------------------------------------------------
21 Mnemonic: mc_listener.c
22 Abstract: This application (management campaign listener) will listen for
23 RMR based messages and write the payloads into FIFOs which
24 correspond to the message type.
27 /var/lib/mc/listener -- directory for FIFOs
30 -d <path> FIFO directory (default is /tmp/mcl/fifos)
31 -p <port> The port to set RMR listener on (default is 4560)
32 -r <seconds> The frequency that count reports are written to
33 stderr. 0 == 0ff; default is 60.
36 RMR based environment variables which might be needed:
37 RMR_SEED_RT -- path to the static routing table
38 RMR_RTG_SVC -- port to listen for RTG connections
41 Author: E. Scott Daniels
54 //---- support -----------------------------------------------------------------------------
56 static void bad_arg( char* what ) {
57 fprintf( stderr, "[ERR] option is unrecognised or isn't followed by meaningful data: %s\n", what );
60 static void usage( char* argv0 ) {
61 fprintf( stderr, "usage: %s [-d fifo-dir] [-e] [-p listen-port] [-q | -r report-freq]\n", argv0 );
62 fprintf( stderr, " -e enable extended header in buffers written to FIFOs\n" );
65 //------------------------------------------------------------------------------------------
66 int main( int argc, char** argv ) {
67 void* ctx; // the mc listener library context
68 char* dname = "/tmp/mcl/fifos"; // default directory where we open fifos
69 char* port = "4560"; // default rmr port
70 char* siphon_dir = "/tmp/mci/siphon"; // where siphon files are placed
71 int siphon = 0; // percentage of messages to siphone off
72 int report_freq = 60; // report stats every n seconds
73 int pidx = 1; // parameter index
75 int long_hdrs = 0; // -e sets and causes extended headers to be written
77 while( pidx < argc && argv[pidx][0] == '-' ) { // simple argument parsing (-x or -x value)
78 switch( argv[pidx][1] ) {
81 dname = strdup( argv[pidx+1] );
84 bad_arg( argv[pidx] );
95 port = strdup( argv[pidx+1] );
98 bad_arg( argv[pidx] );
108 if( pidx+1 < argc ) {
109 report_freq = atoi( argv[pidx+1] );
112 bad_arg( argv[pidx] );
124 bad_arg( argv[pidx] );
137 ctx = mcl_mk_context( dname ); // initialise the library context
139 fprintf( stderr, "[FAIL] couldn't initialise the mc listener environment\n" );
142 mcl_set_sigh(); // set signal handler(s)
144 mcl_start_listening( ctx, port, MCL_NOWAIT ); // start the listener, no waiting for rt since we don't send
145 mcl_fifo_fanout( ctx, report_freq, long_hdrs ); // listen and fanout messages to fifo; report to stdout every ~2sec
147 fprintf( stderr, "[INFO] mc listener is finished.\n" );