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/*
* Copyright (c) 2013-2014 Red Hat.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <signal.h>
#include "pmapi.h"
#include "impl.h"
static int quiet;
static char *mechanism;
static char *options;
static unsigned discoveryFlags;
static int override(int, pmOptions *);
#ifndef IS_MINGW
static void
handleInterrupt(int sig)
{
discoveryFlags |= PM_SERVICE_DISCOVERY_INTERRUPTED;
}
static void
setupSignals(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &handleInterrupt;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGHUP);
sigaddset(&sa.sa_mask, SIGPIPE);
sigaddset(&sa.sa_mask, SIGINT);
sigaddset(&sa.sa_mask, SIGTERM);
sigaddset(&sa.sa_mask, SIGXFSZ);
sigaddset(&sa.sa_mask, SIGXCPU);
sa.sa_flags = SA_RESTART;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGPIPE, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGXFSZ, &sa, NULL);
sigaction(SIGXCPU, &sa, NULL);
}
#else
#define setupSignals() do { } while (0)
#endif
static const char *services[] = {
PM_SERVER_SERVICE_SPEC,
PM_SERVER_PROXY_SPEC,
PM_SERVER_WEBD_SPEC,
};
static pmLongOptions longopts[] = {
PMAPI_OPTIONS_HEADER("Discovery options"),
PMOPT_DEBUG,
{ "mechanism", 1, 'm', "NAME", "set the discovery method to use [avahi|probe=<subnet>|all]" },
{ "resolve", 0, 'r', 0, "resolve addresses" },
{ "service", 1, 's', "NAME", "discover services [pmcd|pmproxy|pmwebd|...|all]" },
{ "timeout", 1, 't', "N.N", "timeout in seconds" },
PMAPI_OPTIONS_HEADER("Reporting options"),
{ "quiet", 0, 'q', 0, "quiet mode, do not write to stdout" },
PMOPT_HELP,
PMAPI_OPTIONS_END
};
static pmOptions opts = {
.short_options = "D:m:rs:t:q?",
.long_options = longopts,
.override = override,
};
static int
override(int opt, pmOptions *opts)
{
(void)opts;
return (opt == 's' || opt == 't');
}
static int
addOption(const char *option, const char *arg)
{
size_t existingLen, optionLen, argLen;
size_t commaLen, equalLen;
/* The existing length and space for a comma. */
if (options == NULL) {
existingLen = 0;
commaLen = 0;
}
else {
existingLen = strlen(options);
commaLen = 1;
}
/*
* Additional space needed.
* We need space for the new option name and an optional argument,
* separated by an '='.
*/
optionLen = strlen(option);
if (arg != NULL) {
equalLen = 1;
argLen = strlen(arg);
}
else {
equalLen = 0;
argLen = 0;
}
/* Make room for the existing options plus the new option */
options = realloc(options, existingLen + commaLen + optionLen + equalLen + argLen);
if (options == NULL)
return -ENOMEM;
/* Add the new option. */
sprintf(options + existingLen, "%s%s%s%s",
commaLen != 0 ? "," : "", option,
equalLen != 0 ? "=" : "",
argLen != 0 ? arg : "");
return 0;
}
static int
discovery(const char *spec)
{
int i, sts;
char **urls;
sts = __pmDiscoverServicesWithOptions(spec, mechanism, options,
&discoveryFlags, &urls);
if (sts < 0) {
fprintf(stderr, "%s: service %s discovery failure: %s\n",
pmProgname, spec, pmErrStr(sts));
return 2;
}
if (sts == 0) {
if (!quiet)
printf("No %s servers discovered\n", spec);
return 1;
}
if (!quiet) {
printf("Discovered %s servers:\n", spec);
for (i = 0; i < sts; ++i)
printf(" %s\n", urls[i]);
}
free(urls);
return 0;
}
int
main(int argc, char **argv)
{
char *service = NULL;
int c, sts, total;
/*
* Set up a handler to catch routine signals, to allow for
* interruption of the discovery process.
*/
setupSignals();
while ((c = pmGetOptions(argc, argv, &opts)) != EOF) {
switch (c) {
case 'm': /* discovery mechanism */
if (strcmp(opts.optarg, "all") == 0)
mechanism = NULL;
else
mechanism = opts.optarg;
break;
case 'q': /* no stdout messages */
quiet = 1;
break;
case 'r': /* resolve addresses */
discoveryFlags |= PM_SERVICE_DISCOVERY_RESOLVE;
break;
case 's': /* local services */
if (strcmp(opts.optarg, "all") == 0)
service = NULL;
else
service = opts.optarg;
break;
case 't': /* timeout */
addOption("timeout", opts.optarg);
break;
default:
opts.errors++;
break;
}
}
if (opts.optind != argc)
opts.errors++;
if (opts.errors) {
pmUsageMessage(&opts);
exit(1);
}
if (service)
return discovery(service);
for (c = sts = total = 0; c < sizeof(services)/sizeof(services[0]); c++) {
if ((discoveryFlags & PM_SERVICE_DISCOVERY_INTERRUPTED) != 0)
break;
sts |= discovery(services[c]);
total += (sts != 0);
}
/*
* Exit status indicates total failure - success indicates
* something (any service, any mechanism) was discovered.
*/
return total == sizeof(services)/sizeof(services[0]) ? sts : 0;
}
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