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/* apt-watch-slave: the slave run as superuser (from su)
*
* Expects argv[1] to be an fd on which arguments are passed.
*
* Copyright 2004 Daniel Burrows
* Copyright 2011 John Lightsey
*
*/
#include <stdio.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/cachefile.h>
#include <apt-pkg/clean.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/depcache.h>
#include <apt-pkg/error.h>
#include <apt-pkg/init.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/pkgsystem.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/sourcelist.h>
#include <apt-pkg/strutl.h>
#include <dirent.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <utime.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_LIBFAM
#include <fam.h>
#endif
#include <string>
#include "apt-watch-common.h"
#include "fileutl.h"
using namespace std;
pkgCacheFile *cache=NULL;
#ifdef HAVE_LIBFAM
FAMConnection famconn;
bool fam_available;
#endif
/** Stores the location of the system lists.
*/
string syslistdir;
/** Stores the location of the system archive directory.
*/
string sysarchivedir;
/** The time of the last change to the system package cache.
*
* We reload 60 seconds after the last change (to avoid constant
* reloads when the user is installing or removing packages)
*
* As a special case, this is 0 if there is no pending reload.
*/
time_t last_cache_change=0;
/** How long to wait before reloading the cache. */
const int RELOAD_DELAY=60;
/** The fd which is used to send messages to the auth helper. */
int to_authhelper_fd=-1;
/** The fd which is used to receive messages from the auth helper. */
int from_authhelper_fd=-1;
static void setup_archive_dir(int outfd);
static void setup_list_dir(int outfd);
static void write_progress_update(int fd, string Op, float Percent, bool MajorChange);
// Sends messages to the given fd for overall progress, compressed by 1/2.
//
// Do anything on Fail?
class slaveAcquireStatus:public pkgAcquireStatus
{
bool needed_media_change;
int fd;
public:
slaveAcquireStatus(int _fd):needed_media_change(false), fd(_fd) {}
// This should never happen for an update, but be robust if it does.
//
// TODO: support this.
bool MediaChange(string Media, string drive)
{
needed_media_change=true;
return true;
}
#if 0
// This code should be used in the parent to query if I find that
// this can actually happen:
{
GtkWidget *dlg=gtk_message_dialog_new(NULL,
GTK_DIALOG_MODAL,
GTK_MESSAGE_INFO,
GTK_BUTTONS_OK,
"Please insert the disk labeled \"%s\" into the drive %s",
Media.c_str(), drive.c_str());
gtk_window_set_position(GTK_WINDOW(dlg), GTK_WIN_POS_CENTER);
gtk_label_set_line_wrap(GTK_LABEL((GTK_MESSAGE_DIALOG(dlg))->label),
TRUE);
gtk_dialog_run(GTK_DIALOG(dlg));
gtk_destroy(dlg);
return true;
}
#endif
void update_progress()
{
if(fd!=-1)
{
float Percent;
if(TotalBytes+TotalItems>0)
Percent=0.5*((100.0*(CurrentBytes+CurrentItems)))/(TotalBytes+TotalItems);
else
Percent=0;
char buf[512];
if(TotalBytes==0)
snprintf(buf, sizeof(buf),
"%ld/%ld items",
CurrentItems, TotalItems);
else
snprintf(buf, sizeof(buf),
"%sb/%sb",
SizeToStr(CurrentBytes).c_str(), SizeToStr(TotalBytes).c_str());
string output=buf;
if(CurrentCPS>0)
{
unsigned long ETA = (unsigned long)((TotalBytes - CurrentBytes)/CurrentCPS);
output=output+"; "+TimeToStr(ETA)+" remaining";
}
write_progress_update(fd, output.c_str(), Percent, false);
}
}
bool Pulse(pkgAcquire *Owner)
{
bool cancelled=false;
pkgAcquireStatus::Pulse(Owner);
// check for a cancel message.
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
struct timeval tm;
tm.tv_sec=0;
tm.tv_usec=0;
select(1, &readfds, NULL, NULL, &tm);
if(FD_ISSET(0, &readfds))
{
unsigned char msgid;
// assume EOF
if(read(0, &msgid, sizeof(msgid))==sizeof(msgid) &&
msgid!=APPLET_CMD_ABORT_DOWNLOAD)
{
write_msg(1, APPLET_REPLY_FATALERROR, "Protocol error: received non-abort message during a download.");
exit(-1);
}
cancelled=true;
}
if(needed_media_change)
_error->Error("A media change was necessary and was not performed. Please send a feature request for media change support.");
update_progress();
return !needed_media_change && !cancelled;
}
void IMSHit(pkgAcquire::ItemDesc&) {update_progress();}
void Fetch(pkgAcquire::ItemDesc&) {update_progress();}
void Done(pkgAcquire::ItemDesc&) {update_progress();}
void Fail(pkgAcquire::ItemDesc&) {update_progress();}
void Start() {update_progress();}
void Stop()
{
if(fd!=-1)
{
unsigned char msgtype=APPLET_REPLY_PROGRESS_DONE;
write(fd, &msgtype, sizeof(msgtype));
}
}
};
class my_cleaner:public pkgArchiveCleaner
{
protected:
virtual void Erase(const char *file,
string pkg,
string ver,
struct stat &stat)
{
unlink(file);
}
};
static void do_autoclean()
{
if(_config->FindDir("Dir::Cache::archives")!=syslistdir)
{
my_cleaner cleaner;
cleaner.Go(_config->FindDir("Dir::Cache::archives"), *cache);
cleaner.Go(_config->FindDir("Dir::Cache::archives")+"partial/", *cache);
}
}
static void write_progress_update(int fd, string Op, float Percent, bool MajorChange)
{
unsigned char msgid=APPLET_REPLY_PROGRESS_UPDATE;
write(fd, &msgid, sizeof(msgid));
write_string(fd, Op);
write(fd, &Percent, sizeof(Percent));
write(fd, &MajorChange, sizeof(MajorChange));
}
class SlaveProgress:public OpProgress
{
int fd;
// HACK: How much of the space between 0 and 100 to reserve for a
// PREVIOUS process when sending messages to the parent.
//
// This is a very special-purpose tweak to better support showing
// the update progress.
float reserve;
public:
SlaveProgress(int _fd,
float _reserve=0):fd(_fd), reserve(_reserve) {}
protected:
void Update()
{
if(CheckChange(0.2))
{
float ActualPercent=Percent*(1-reserve)+reserve;
write_progress_update(fd, Op, ActualPercent, MajorChange);
}
}
public:
void Done()
{
unsigned char msgid=APPLET_REPLY_PROGRESS_DONE;
write(fd, &msgid, sizeof(msgid));
}
};
static void dump_errors(unsigned char msgid, int fd)
{
string errs="";
while(!_error->empty())
{
string msg;
if(_error->PopMessage(msg))
{
if(errs.empty())
errs=msg;
else
errs=errs+"\n"+msg;
}
}
if(!errs.empty())
write_msg(fd, msgid, errs);
}
/** Copy the global lists to our private list directory. */
void copy_lists()
{
string mylistdir=_config->FindDir("Dir::State::Lists");
if(mylistdir != syslistdir)
copy_newer_recursive(syslistdir, mylistdir);
}
/** Tests whether a particular version is security-related.
*
* \return \b true iff the given package version comes from security.d.o
*/
static bool version_is_security(const pkgCache::VerIterator &ver)
{
for(pkgCache::VerFileIterator F=ver.FileList(); !F.end(); ++F)
if(string(F.File().Site())=="security.debian.org")
return true;
return false;
}
/** Tests whether a package's candidate version is security-related.
* (convenience around the above)
*/
static bool upgrade_is_security(const pkgCache::PkgIterator &pkg)
{
return !pkg.end() &&
version_is_security((*cache)[pkg].CandidateVerIter(*cache));
}
/** Checks what sort of upgrades are available.
*
* \return 0 if no upgrades, 1 for non-security upgrades, 2 for
* security upgrades
*/
static unsigned int upgrade_status()
{
bool upgrades_exist=false;
for(pkgCache::PkgIterator i=(*cache)->PkgBegin(); !i.end(); ++i)
if(!i.CurrentVer().end() && (*cache)[i].Upgradable())
{
upgrades_exist=true;
if(upgrade_is_security(i))
return 2;
}
return upgrades_exist?1:0;
}
static void write_cmd_reply(int outfd)
{
unsigned char msgid;
switch(upgrade_status())
{
case 0: msgid=APPLET_REPLY_CMD_COMPLETE_NOUPGRADES; break;
case 1: msgid=APPLET_REPLY_CMD_COMPLETE_UPGRADES; break;
case 2: msgid=APPLET_REPLY_CMD_COMPLETE_SECURITY_UPGRADES; break;
default: msgid=APPLET_REPLY_CMD_COMPLETE_NOUPGRADES; break;
}
write_msgid(outfd, msgid);
}
static void write_init_reply(int outfd)
{
unsigned char msgid;
switch(upgrade_status())
{
case 0: msgid=APPLET_REPLY_INIT_OK_NOUPGRADES; break;
case 1: msgid=APPLET_REPLY_INIT_OK_UPGRADES; break;
case 2: msgid=APPLET_REPLY_INIT_OK_SECURITY_UPGRADES; break;
default: msgid=APPLET_REPLY_INIT_OK_NOUPGRADES; break;
}
write_msgid(outfd, msgid);
}
static void do_update(int outfd)
{
setup_list_dir(outfd);
setup_archive_dir(outfd);
SlaveProgress progress(outfd);
copy_lists();
slaveAcquireStatus log(outfd);
pkgSourceList sources;
if(sources.ReadMainList()==false || _error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
FileFd lock;
lock.Fd(GetLock(_config->FindDir("Dir::State::Lists")+"lock"));
if(_error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
pkgAcquire fetcher;
if (!fetcher.Setup(&log, ""))
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
if(!sources.GetIndexes(&fetcher))
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
if(fetcher.Run()==pkgAcquire::Failed)
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
cache->Close();
if(!cache->Open(&progress, false))
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
if(!fetcher.Clean(_config->FindDir("Dir::State::lists")) ||
!fetcher.Clean(_config->FindDir("Dir::State::lists")+"partial/"))
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
if(_error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
do_autoclean();
if(_error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
else
{
write_cmd_reply(outfd);
// Cancel any pending reload.
last_cache_change=0;
}
}
static void do_reload(int outfd)
{
setup_list_dir(outfd);
setup_archive_dir(outfd);
SlaveProgress progress(outfd);
copy_lists();
cache->Close();
if(!cache->Open(&progress, false))
dump_errors(APPLET_REPLY_FATALERROR, outfd);
else
write_cmd_reply(outfd);
// Cancel any pending reload.
last_cache_change=0;
}
static void do_su(int cmdfd, int outfd)
{
bool run_xterm=0;
read(cmdfd, &run_xterm, sizeof(run_xterm));
char *cmdchstr=read_string(cmdfd);
if(cmdchstr==NULL)
{
write_msg(outfd, APPLET_REPLY_AUTH_FAIL, "Protocol error: can't read the string which should be sent.");
free(cmdchstr);
return;
}
string cmd=cmdchstr;
//free(cmdchstr);
// Abort if we already have an auth helper running.
//
// NOTE: this is not terribly robust; it means that if the auth
// helper stalls, we get stuck and can't execute a new one. It might
// be worthwhile to have a back-and-forth with the UI about whether to
// kill off the helper...except that we probably (?) can't do that. hm.
if(to_authhelper_fd!=-1)
return;
// Fork off the helper.
int slavetohelper[2];
int helpertoslave[2];
if(pipe(slavetohelper)!=0 ||
pipe(helpertoslave)!=0)
{
write_errno(outfd, APPLET_REPLY_AUTH_FAIL, "Couldn't open pipe to child process: %s");
return;
}
switch(fork())
{
case 0:
{
char authhelper[]=LIBEXECDIR "/apt-watch-auth-helper";
close(cmdfd);
close(outfd);
// Close the appropriate ends of the pipe
close(slavetohelper[1]);
close(helpertoslave[0]);
dup2(slavetohelper[0], 0);
dup2(helpertoslave[1], 1);
close(slavetohelper[0]);
close(helpertoslave[1]);
if(run_xterm)
execl(authhelper, authhelper, "-x", cmd.c_str(), NULL);
else
execl(authhelper, authhelper, cmd.c_str(), NULL);
write_errno(helpertoslave[1], APPLET_REPLY_AUTH_FAIL, "Unable to execute \""+string(authhelper)+"\": %s");
exit(-1);
}
case -1:
close(slavetohelper[0]);
close(slavetohelper[1]);
close(helpertoslave[0]);
close(helpertoslave[1]);
write_errno(cmdfd, APPLET_REPLY_AUTH_FAIL, "Unable to fork: %s");
return;
default:
close(slavetohelper[0]);
close(helpertoslave[1]);
to_authhelper_fd=slavetohelper[1];
from_authhelper_fd=helpertoslave[0];
break;
}
}
static void do_auth_reply(int cmdfd, int outfd)
{
char *s=read_string(cmdfd);
if(!s)
write_msg(outfd, APPLET_REPLY_AUTH_ERRORMSG, "Protocol error reading the command to execute.");
else if(to_authhelper_fd!=-1)
write_string(to_authhelper_fd, s);
free(s);
}
static bool candidate_in_system_cache(pkgCache::PkgIterator &pkg)
{
// This ASS U ME s that apt-pkg places things in
// [Dir::Cache::archives]/name_version_arch.deb . See
// acquire_item.cc:376 (from apt 0.5.4)
pkgCache::VerIterator candver=(*cache)[pkg].CandidateVerIter(*cache);
if(candver.end())
// hm
return true;
string fn=sysarchivedir +
QuoteString(candver.ParentPkg().Name(),"_:") + '_' +
QuoteString(candver.VerStr(),"_:") + '_' +
QuoteString(candver.Arch(),"_:.") + ".deb";
return access(fn.c_str(), F_OK)==0;
}
static void do_download(int cmdfd, int outfd)
{
setup_archive_dir(outfd);
bool download_all;
read(cmdfd, &download_all, sizeof(download_all));
slaveAcquireStatus log(outfd);
pkgAcquire fetcher;
if (!fetcher.Setup(&log, ""))
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
pkgSourceList sources;
pkgRecords records(*cache);
if(sources.ReadMainList()==false || _error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
FileFd lock;
lock.Fd(GetLock(_config->FindDir("Dir::State::Lists")+"lock"));
if(_error->PendingError())
{
dump_errors(APPLET_REPLY_FATALERROR, outfd);
return;
}
// A pox on undocumented APIs!
//
// The way this works is: the fetchers store *references* to their
// final filenames in this array. In order to have them do the
// Right Thing (ie, default behavior), I need to generate a lot of
// *distinct* strings here.
vector<string *> filenames;
// Download every upgradable file; include files that are depended upon.
// Mark first without autoinst
for(pkgCache::PkgIterator pkg=(*cache)->PkgBegin(); !pkg.end(); ++pkg)
if(!pkg.CurrentVer().end() && (*cache)[pkg].Upgradable() &&
(download_all || upgrade_is_security(pkg)))
(*cache)->MarkInstall(pkg);
// Next with.
for(pkgCache::PkgIterator pkg=(*cache)->PkgBegin(); !pkg.end(); ++pkg)
if(!pkg.CurrentVer().end() && (*cache)[pkg].Upgradable() &&
(download_all || upgrade_is_security(pkg)))
(*cache)->MarkInstall(pkg, true);
// TODO: exclude files whose .deb already exists in the system directory.
// TODO: exclude held files.
for(pkgCache::PkgIterator pkg=(*cache)->PkgBegin(); !pkg.end(); ++pkg)
if((*cache)[pkg].Install() &&
!candidate_in_system_cache(pkg))
{
filenames.push_back(new string());
new pkgAcqArchive(&fetcher, &sources, &records,
(*cache)[pkg].CandidateVerIter(*cache),
*(filenames.back()));
}
fetcher.Run();
while(!filenames.empty())
{
delete filenames.back();
filenames.pop_back();
}
// Nothing else to do right now: if the update failed, that's
// Someone Else's Problem.
if(_error->PendingError())
dump_errors(APPLET_REPLY_FATALERROR, outfd);
write_msgid(outfd, APPLET_REPLY_DOWNLOAD_COMPLETE);
}
const char *HOME;
/** If the archive directory is not writable, put archives in
* ~/.apt-watch/archives.
*/
static void setup_archive_dir(int outfd)
{
if(sysarchivedir=="")
sysarchivedir=_config->FindDir("Dir::Cache::archives");
if(access(sysarchivedir.c_str(), R_OK|W_OK|X_OK)!=0)
{
if(!HOME)
{
write_msg(outfd, APPLET_REPLY_FATALERROR,
"The HOME directory is not set, can't create a private cache directory.");
exit(-1);
}
string myarchivedir=string(HOME)+"/.apt-watch/archives";
if(access(myarchivedir.c_str(), F_OK)!=0)
mkdir(myarchivedir.c_str(), 0755);
string partial=myarchivedir+"/partial";
if(access(partial.c_str(), F_OK)!=0)
mkdir(partial.c_str(), 0755);
_config->Set("Dir::Cache::archives", myarchivedir.c_str());
}
}
/** If the list directory is not writable, put lists in
* ~/.apt-watch/lists.
*/
static void setup_list_dir(int outfd)
{
if(syslistdir=="")
syslistdir=_config->FindDir("Dir::State::lists");
if(access(syslistdir.c_str(), R_OK|W_OK|X_OK)!=0)
{
if(!HOME)
{
write_msg(outfd, APPLET_REPLY_FATALERROR,
"The HOME directory variable is not set, can't create a private list directory.");
exit(-1);
}
string mylistdir=string(HOME)+"/.apt-watch/lists";
if(access(mylistdir.c_str(), F_OK)!=0)
mkdir(mylistdir.c_str(), 0755);
string partial=mylistdir+"/partial";
if(access(partial.c_str(), F_OK)!=0)
mkdir(partial.c_str(), 0755);
_config->Set("Dir::State::lists", mylistdir);
}
}
static void shutdown_auth_helper()
{
int Status = 0;
close(to_authhelper_fd);
close(from_authhelper_fd);
to_authhelper_fd=-1;
from_authhelper_fd=-1;
// reap any dead children
while (waitpid(-1, &Status, WNOHANG) > 0)
;
}
/** Returns \b true to terminate the program successfully. */
bool slave_handle_input(int cmdfd, int outfd)
{
unsigned char c;
if(read(cmdfd, &c, sizeof(c))<(int) sizeof(c))
{
// assume we should terminate.
return true;
}
else
switch(c)
{
case APPLET_CMD_UPDATE:
do_update(outfd);
break;
case APPLET_CMD_RELOAD:
do_reload(outfd);
break;
case APPLET_CMD_SU:
do_su(cmdfd, outfd);
break;
case APPLET_CMD_AUTHREPLY:
do_auth_reply(cmdfd, outfd);
break;
case APPLET_CMD_AUTHCANCEL:
shutdown_auth_helper();
break;
case APPLET_CMD_DOWNLOAD:
do_download(cmdfd, outfd);
break;
default:
{
char s[1024];
snprintf(s, sizeof(s)-1, "Bad command ID %d", c);
write_msg(outfd, APPLET_REPLY_FATALERROR, s);
}
break;
}
return false;
}
static void slave_handle_auth_input(int outfd)
{
unsigned char c;
if(from_authhelper_fd==-1)
{
write_msg(outfd, APPLET_REPLY_AUTH_FAIL, "Internal error: I want to read an authentication message but the pipe is closed.");
return;
}
if(read(from_authhelper_fd, &c, sizeof(c))<(int) sizeof(c))
shutdown_auth_helper();
else
// Any APPLET_REPLY_AUTH* command is possible.
//
// We just forward them to our parent. We do NOT splice the pipe
// with our parent's pipe: while it is an idea, atomic write()s
// are not currently used, which could cause problems.
switch(c)
{
// These all pass a single string as an argument.
case APPLET_REPLY_AUTH_PROMPT_NOECHO:
case APPLET_REPLY_AUTH_PROMPT_ECHO:
case APPLET_REPLY_AUTH_ERRORMSG:
case APPLET_REPLY_AUTH_INFO:
case APPLET_REPLY_AUTH_FAIL:
{
char *s=read_string(from_authhelper_fd);
if(s==NULL)
{
write_errno(outfd, APPLET_REPLY_AUTH_FAIL, "Couldn't read a message from the authentication helper: %s");
shutdown_auth_helper();
}
else
write_msg(outfd, c, s);
free(s);
break;
}
case APPLET_REPLY_AUTH_OK:
write_msgid(outfd, c);
break;
case APPLET_REPLY_AUTH_FINISHED:
write_msgid(outfd, c);
shutdown_auth_helper();
break;
default:
write_msg(outfd, APPLET_REPLY_AUTH_FAIL, "Garbled reply from the authentication helper.");
shutdown_auth_helper();
break;
}
}
#ifdef HAVE_LIBFAM
void slave_handle_fam()
{
FAMEvent ev;
while(FAMPending(&famconn))
{
FAMNextEvent(&famconn, &ev);
// Ignore lockfiles.
if(strcmp(ev.filename, "lock")==0)
continue;
switch(ev.code)
{
case FAMChanged:
case FAMDeleted:
case FAMCreated:
last_cache_change=time(0);
break;
default:
// Drop other events on the floor.
break;
}
}
}
#endif
int slave_main(int cmdfd, int outfd)
{
// eternal loop.
while(1)
{
fd_set readfds;
int res;
int highest=-1;
int famfd=fam_available?FAMCONNECTION_GETFD(&famconn):-1;
struct timeval tm;
FD_ZERO(&readfds);
FD_SET(cmdfd, &readfds);
highest=max(highest, cmdfd);
#ifdef HAVE_LIBFAM
if(fam_available)
{
FD_SET(famfd, &readfds);
highest=max(highest, famfd);
}
#endif
if(from_authhelper_fd!=-1)
{
FD_SET(from_authhelper_fd, &readfds);
highest=max(highest, from_authhelper_fd);
}
// See how long to select for.
if(last_cache_change==0)
res=select(highest+1, &readfds, NULL, NULL, NULL);
else
{
time_t curtime=time(0);
if(last_cache_change+RELOAD_DELAY<curtime)
tm.tv_sec=0;
else
tm.tv_sec=last_cache_change+RELOAD_DELAY-curtime;
tm.tv_usec=0;
res=select(highest+1, &readfds, NULL, NULL, &tm);
}
if(FD_ISSET(cmdfd, &readfds))
if(slave_handle_input(cmdfd, outfd))
return 0;
#ifdef HAVE_LIBFAM
if(fam_available && FD_ISSET(famfd, &readfds))
slave_handle_fam();
#endif
if(from_authhelper_fd!=-1 && FD_ISSET(from_authhelper_fd, &readfds))
slave_handle_auth_input(outfd);
// A slightly quirky way of doing this: if a reload is overdue,
// we send a message to the applet requesting a reload command.
// This roundabout approach is used in order to avoid any
// potential race conditions (if a reload is inappropriate, the
// applet will just drop the message on the floor -- the only
// reason it can be inappropriate is if a reload or update is
// already "under progress" -- meaning that we haven't read the
// message requesting it yet).
if(last_cache_change>0 &&
time(0)>last_cache_change &&
time(0)-last_cache_change>=RELOAD_DELAY)
{
unsigned char msgtype=APPLET_REPLY_REQUEST_RELOAD;
write(outfd, &msgtype, 1);
last_cache_change=0;
}
}
}
int main(int argc, char **argv)
{
int cmdfd=0;
int outfd=1;
int my_version=PROTOCOL_VERSION;
int other_version;
HOME=getenv("HOME");
signal(SIGPIPE, SIG_IGN);
write(outfd, &my_version, sizeof(my_version));
read(cmdfd, &other_version, sizeof(other_version));
// Compatibility logic goes here.
if(my_version>other_version)
{
write_msg(outfd, APPLET_REPLY_FATALERROR, "Can't start the monitor: it speaks too new a version of the protocol.");
return -1;
}
// Handle the SUID case
if(getuid()!=0 && geteuid()==0)
{
clearenv();
}
else if(getuid()!=geteuid())
{
write_msg(outfd, APPLET_REPLY_AUTH_FAIL, "The SUID bit of the slave is set, but it is not SUID root; don't know what to do.");
return -1;
}
else
{
// "dummy" authentication OK. (? -- just get rid of this here now?)
unsigned char msg=APPLET_REPLY_AUTH_OK;
write(1, &msg, sizeof(msg));
if(HOME)
{
// Make a private directory for later use
string mydir=string(HOME)+"/.apt-watch";
if(access(mydir.c_str(), F_OK)!=0)
mkdir(mydir.c_str(), 0755);
}
}
if(pkgInitConfig(*_config))
pkgInitSystem(*_config, _system);
if(_error->PendingError())
{
dump_errors(APPLET_REPLY_INIT_FAILED, outfd);
return -1;
}
setup_list_dir(outfd);
setup_archive_dir(outfd);
cache=new pkgCacheFile;
SlaveProgress progress(outfd);
if(!cache->Open(&progress, false) || _error->PendingError())
{
dump_errors(APPLET_REPLY_INIT_FAILED, outfd);
return -1;
}
write_init_reply(outfd);
#ifdef HAVE_LIBFAM
// If opening the FAM connection fails, just don't bother.
// TODO/FIXME: periodically reload the cache in that case.
if(FAMOpen(&famconn)==0)
{
FAMRequest fr;
FAMMonitorDirectory(&famconn, syslistdir.c_str(), &fr, NULL);
FAMMonitorDirectory(&famconn, (syslistdir+"/partial").c_str(),
&fr, NULL);
FAMMonitorDirectory(&famconn, _config->FindDir("Dir::Etc").c_str(),
&fr, NULL);
FAMMonitorFile(&famconn, _config->FindFile("Dir::State::status").c_str(),
&fr, NULL);
fam_available=true;
}
else
fprintf(stderr, "Unable to initialize FAM.\n");
#endif
int rval=slave_main(cmdfd, outfd);
#ifdef HAVE_LIBFAM
FAMClose(&famconn);
#endif
return rval;
}
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