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-rw-r--r--src/process.cc14
1 files changed, 8 insertions, 6 deletions
diff --git a/src/process.cc b/src/process.cc
index 96c874f..6d3b2a2 100644
--- a/src/process.cc
+++ b/src/process.cc
@@ -1,231 +1,233 @@
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <dirent.h>
#include <sys/wait.h>
#include <syslog.h>
#include <errno.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
using namespace std;
#include "process.h"
#include "configuration.h"
static multimap<string,pid_t> procpids;
void process::check() const {
if(!pidfile.empty()) {
signal(0);
}else if(!process_name.empty()) {
if(procpids.empty())
gather_proc_info();
if(procpids.find(process_name)==procpids.end())
throw runtime_error("no such process");
} // XXX: or else?
}
void process::check(const string& id,configuration& config) {
try {
check();
patience = 0;
}catch(exception& e) {
if(patience>60) { // TODO: configurable
patience = 0;
}else{
if(patience<10) { // TODO: configurable
syslog(LOG_NOTICE,"The process '%s' is down, trying to launch.",id.c_str());
do_notify(id,"Starting up",
"The named process seems to be down. Dudki will try\n"
"to revive it by running the specified command.\n",
config);
try {
launch(id,config);
}catch(exception& e) {
syslog(LOG_ERR,"Error trying to launch process '%s': %s",id.c_str(),e.what());
}
}else if(patience==10){ // TODO: configurable like the above
syslog(LOG_NOTICE,"Giving up on process '%s' for a while",id.c_str());
do_notify(id,"Giving up",
"After a number of attempts to relaunch the named process\n"
"It still seems to be down. Dudki is giving up attempts\n"
"to revive the process for a while.\n",
config);
}
patience++;
}
}
}
void process::launch(const string& id,configuration& config) {
uid_t uid = (uid_t)-1;
gid_t gid = (gid_t)-1;
if(!user.empty()) {
struct passwd *ptmp = getpwnam(user.c_str());
if(ptmp) {
uid = ptmp->pw_uid;
gid = ptmp->pw_gid;
}else{
errno=0;
uid = strtol(user.c_str(),NULL,0);
if(errno)
throw runtime_error("Failed to resolve User value to uid");
}
}
if(!group.empty()) {
struct group *gtmp = getgrnam(group.c_str());
if(gtmp) {
gid = gtmp->gr_gid;
}else{
errno = 0;
gid = strtol(group.c_str(),NULL,0);
if(errno)
throw runtime_error("Failed to reslove Group value to gid");
}
}
pid_t p = fork();
if(p<0)
throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to fork()");
if(!p) {
// child
try {
setsid();
- if(user.empty()) {
- if((getgid()!=gid) && setgid(gid))
- throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to setgid()");
- }else{
- if(initgroups(user.c_str(),gid))
- throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to initgroups()");
+ if(!group.empty()) {
+ if(user.empty()) {
+ if((getgid()!=gid) && setgid(gid))
+ throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to setgid()");
+ }else{
+ if(initgroups(user.c_str(),gid))
+ throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to initgroups()");
+ }
}
if(!chroot.empty()) {
if(::chroot(chroot.c_str()))
throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to chroot()");
}
if(!user.empty()) {
if((getuid()!=uid) && setuid(uid))
throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to setuid()");
}
char *argv[] = { "/bin/sh", "-c", (char*)restart_cmd.c_str(), NULL };
close(0); close(1); close(2);
execv("/bin/sh",argv);
}catch(exception& e) {
syslog(LOG_ERR,"Error trying to launch process '%s': %s",id.c_str(),e.what());
}
_exit(-1);
}
// parent
int rv;
if(waitpid(p,&rv,0)<0)
throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to waitpid()");
}
void process::do_notify(const string& id,const string& event,const string& description,configuration& config) {
string the_notify;
if(!notify.empty())
the_notify=notify;
else if(!config.notify.empty())
the_notify=config.notify;
else
return;
try {
string::size_type colon = the_notify.find(':');
if(colon==string::npos)
throw runtime_error("invalid notify action specification");
string nschema = the_notify.substr(0,colon);
string ntarget = the_notify.substr(colon+1);
if(nschema=="mailto") {
notify_mailto(ntarget,id,event,description,config);
}else
throw runtime_error("unrecognized notification schema");
}catch(exception& e) {
syslog(LOG_ERR,"Notification error: %s",e.what());
}
}
void process::notify_mailto(const string& email,const string& id,const string& event,const string& description,configuration& config) {
int files[2];
if(pipe(files))
throw runtime_error("Failed to pipe()");
pid_t pid = vfork();
if(pid==-1) {
close(files[0]);
close(files[1]);
throw runtime_error("Failed to vfork()");
}
if(!pid) {
// child
if(dup2(files[0],0)!=0)
_exit(-1);
close(1);
close(files[0]);
close(files[1]);
execl("/usr/sbin/sendmail","usr/sbin/sendmail","-i",email.c_str(),NULL);
_exit(-1);
}
// parent
close(files[0]);
FILE *mta = fdopen(files[1],"w");
for(headers_t::const_iterator i=mailto_headers.begin();i!=mailto_headers.end();++i) {
fprintf(mta,"%s: %s\n",i->first.c_str(),i->second.c_str());
}
for(headers_t::const_iterator i=config.mailto_headers.begin();i!=config.mailto_headers.end();++i) {
if(mailto_headers.find(i->first)!=mailto_headers.end())
continue;
fprintf(mta,"%s: %s\n",i->first.c_str(),i->second.c_str());
}
fprintf(mta,
"Subject: [%s] %s\n\n"
"%s\n"
"---\n"
"This message was sent automatically by the 'dudki' daemon\n",
id.c_str(), event.c_str(),
description.c_str() );
fclose(mta);
int status;
waitpid(pid,&status,0);
// TODO: check the return code
}
void process::signal(int signum) const {
if(!pidfile.empty()) {
ifstream pids(pidfile.c_str(),ios::in);
if(!pids)
throw runtime_error("no pidfile found");
pid_t pid = 0;
pids >> pid;
pids.close();
if(!pid)
throw runtime_error("no pid in pidfile");
if(kill(pid,signum))
throw runtime_error("failed to signal process");
}else if(!process_name.empty()) {
if(procpids.empty())
gather_proc_info();
pair<multimap<string,pid_t>::const_iterator,multimap<string,pid_t>::const_iterator> range = procpids.equal_range(process_name);
int count = 0;
for(multimap<string,pid_t>::const_iterator i=range.first;i!=range.second;++i) {
pid_t pid = i->second;
if(kill(i->second,signum))
throw runtime_error("failed to signal process");
count++;
}
if(!count)
throw runtime_error("no running instance detected");
}else
throw runtime_error("nothing is known about the process");
}
void process::prepare_herd() {
procpids.clear();
}
void process::unprepare_herd() {
procpids.clear();
}
void process::gather_proc_info() {
vector<pid_t> allpids;
DIR *pd = opendir("/proc");