utempter-utmp-cleanup.patch

   1 diff -urN utempter-0.5.3.org/Makefile utempter-0.5.3/Makefile
   2 --- utempter-0.5.3.org/Makefile 2003-12-18 23:33:32.081092612 +0100
   3 +++ utempter-0.5.3/Makefile     2003-12-18 23:34:17.941588864 +0100
   4 @@ -11,12 +11,12 @@
   5
   6  CFLAGS = -Wall $(RPM_OPT_FLAGS)
   7
   8 -TARGETS = $(NAME) utmp $(SHAREDLIB)
   9 +TARGETS = $(NAME) utmp $(SHAREDLIB) utmp-cleanup
  10
  11  all:   $(TARGETS)
  12
  13  clean:
  14 -       rm -f *.so utempter utmp *.os
  15 +       rm -f *.so utempter utmp *.os utmp-cleanup
  16
  17  %.os : %.c
  18         $(CC) -c $(CFLAGS) -fPIC $< -o $@
  19 @@ -26,6 +26,7 @@
  20         mkdir -p $(RPM_BUILD_ROOT)/$(LIBDIR)
  21         mkdir -p $(RPM_BUILD_ROOT)/usr/include
  22         install -m 4755 utempter $(RPM_BUILD_ROOT)/usr/sbin
  23 +       install -m 755 utmp-cleanup $(RPM_BUILD_ROOT)/usr/sbin
  24         install -m 644 utempter.h $(RPM_BUILD_ROOT)/usr/include
  25         install -m 644 $(SHAREDLIB) $(RPM_BUILD_ROOT)/$(LIBDIR)/$(SHAREDLIB).$(VERSION)
  26         ln -sf $(SHAREDLIB).$(VERSION) $(RPM_BUILD_ROOT)/$(LIBDIR)/$(SHAREDLIB)
  27 diff -urN utempter-0.5.3.org/utmp-cleanup.c utempter-0.5.3/utmp-cleanup.c
  28 --- utempter-0.5.3.org/utmp-cleanup.c   1970-01-01 01:00:00.000000000 +0100
  29 +++ utempter-0.5.3/utmp-cleanup.c       2003-12-18 23:33:51.996966369 +0100
  30 @@ -0,0 +1,69 @@
  31 +#include <unistd.h>
  32 +#include <fcntl.h>
  33 +#include <stdio.h>
  34 +#include <utmp.h>
  35 +#include <sys/stat.h>
  36 +#include <sys/types.h>
  37 +#include <pwd.h>
  38 +
  39 +int check_entry(struct utmp * ut)
  40 +{
  41 +char buf[100];
  42 +struct stat st;
  43 +struct passwd * pwd;
  44 +int s;
  45 +
  46 +pwd=getpwnam(ut->ut_user);
  47 +       if(!pwd)return 1;
  48 +
  49 +snprintf(buf,100,"/proc/%d/",ut->ut_pid);
  50 +s=stat(buf,&st);
  51 +       if(s)return 2;
  52 +
  53 +       if(st.st_uid!=pwd->pw_uid && st.st_uid!=0)return 3;
  54 +return 0;
  55 +}
  56 +
  57 +char * msgs[]={"","Nonexistent user","Dead process","Owner mismatch"};
  58 +
  59 +int main(int ac, char ** av)
  60 +{
  61 +int clean=1;
  62 +int justcheck=0;
  63 +int fd;
  64 +char * file="/var/run/utmpx";
  65 +       if(ac>1)file=av[1];
  66 +fd=open(file,O_RDWR,0);
  67 +       if(fd<0){
  68 +       fd=open(file,O_RDONLY,0);
  69 +       justcheck=1;
  70 +       printf("Warning: opening %s read-only\n",file);
  71 +       }
  72 +
  73 +       if(fd<0){
  74 +       perror("open"); exit(1);
  75 +       }
  76 +
  77 +       while(1){
  78 +       struct utmp ut;
  79 +       int r=read(fd,&ut,sizeof(ut));
  80 +               if(r!=sizeof(ut))break;
  81 +
  82 +               if(ut.ut_type==USER_PROCESS){
  83 +               int i;
  84 +                       if((i=check_entry(&ut))){
  85 +                       clean=0;
  86 +                       printf("%s: %d (%s)\n",msgs[i],ut.ut_pid,ut.ut_name);
  87 +                       if(justcheck)continue;
  88 +                       lseek(fd,-sizeof(ut),SEEK_CUR);
  89 +                       bzero(&ut,sizeof(ut));
  90 +                       ut.ut_type=DEAD_PROCESS;
  91 +                       write(fd,&ut,sizeof(ut));
  92 +                       }
  93 +               }
  94 +
  95 +       }
  96 +
  97 +       if(clean)printf("%s is clean\n",file);
  98 +return 0;
  99 +}