arpd-uid.patch

   1 --- ./arpd.c.orig       Tue Aug 21 13:26:27 2001
   2 +++ ./arpd.c    Fri Aug 24 12:28:12 2001
   3 @@ -21,6 +21,7 @@
   4  #include <sys/socket.h>
   5  #include <netinet/in.h>
   6  #include <arpa/inet.h>
   7 +#include <pwd.h>
   8
   9  #ifdef DEBUG
  10  static void arpd_print(char*, struct arpd_request*);
  11 @@ -28,10 +29,25 @@
  12  #define arpd_print(x,y)
  13  #endif
  14
  15 -/* these shouldn't change for ipv4 */
  16 +/* these shouldn't change for ipv4     */
  17  #define ARPD_TRIEWIDTH 256
  18  #define ARPD_TRIEDEPTH 16
  19
  20 +/* usage string                                */
  21 +static char* usage=
  22 +"ARP daemon - version 1.0.2 - PLD modified
  23 +Usage: arpd -u user
  24 +-u             user, which you want to run this deamon
  25 +
  26 +The user you will take must have RW access to /dev/arpd.
  27 +If you don't know what to choice take root.
  28 +
  29 +";
  30 +
  31 +void show_usage() {
  32 +       fprintf(stdout,usage);
  33 +}
  34 +
  35  union arpd_triedef
  36  {
  37         union arpd_triedef * hash;
  38 @@ -54,7 +70,34 @@
  39         struct arpd_request req;
  40         struct arpd_request *rep;
  41
  42 +       char* cmd = NULL;
  43 +       unsigned int uid_num = 0;
  44 +       struct passwd *pw;
  45 +       char *account;
  46 +
  47 +if ((argc != 3)) {
  48 +       fprintf(stdout,"Invalid option.\n");
  49 +       show_usage();
  50 +       exit(1);
  51 +       }
  52 +else {
  53  #ifndef DEBUG
  54 +       cmd = argv[1];
  55 +
  56 +       if (strcasecmp(cmd, "-u") == 0) {
  57 +               account=argv[2];
  58 +               pw=getpwnam(account);
  59 +               if (!pw) {
  60 +                       fprintf(stderr,"Unknown account.\n");
  61 +                       exit(1);
  62 +               }
  63 +               uid_num=pw->pw_uid;
  64 +       }
  65 +       else {
  66 +               fprintf(stderr,"Invalid option.\n");
  67 +               show_usage();
  68 +               exit(1);
  69 +       }
  70         if (fork())
  71                 exit(0);
  72
  73 @@ -72,14 +115,19 @@
  74                 if (fd > 2)
  75                         close(fd);
  76         }
  77 -       setsid();
  78 +       /* setsid(); */
  79 +
  80  #endif
  81
  82         openlog ("arpd", LOG_PID | LOG_CONS, LOG_DAEMON);
  83
  84 -       syslog(LOG_NOTICE, "Initializing, version %s\n", ARPD_VERSION);
  85 +       syslog(LOG_NOTICE, "Initializing, modified version %s\n", ARPD_VERSION);
  86
  87         fd = open("/dev/arpd", O_RDWR);
  88 +
  89 +       /* Set proper UID */
  90 +       setuid(uid_num);
  91 +
  92         if (fd < 0) {
  93                 syslog(LOG_CRIT, "cannot open /dev/arpd: %m");
  94                 exit(-1);
  95 @@ -136,6 +184,7 @@
  96         }
  97
  98         return 0;
  99 +       }
 100  }
 101
 102  static void arpd_update (struct arpd_request * entry)