dhcp-release-by-ifup.patch

   1 --- dhcp-3.0.5/client/dhclient.c.release        2007-03-30 15:30:14.000000000 -0400
   2 +++ dhcp-3.0.5/client/dhclient.c        2007-03-30 15:29:58.000000000 -0400
   3 @@ -366,9 +366,81 @@
   4                                 }
   5                         }
   6                         fclose(pidfd);
   7 +               } else {
   8 +                       /* handle release for interfaces requested with Red Hat
   9 +                        * /sbin/ifup - pidfile will be /var/run/dhclient-$interface.pid
  10 +                        */
  11 +
  12 +                       if ((path_dhclient_pid == NULL) || (*path_dhclient_pid == '\0'))
  13 +                               path_dhclient_pid = "/var/run/dhclient.pid";
  14 +
  15 +                       char *new_path_dhclient_pid;
  16 +                       struct interface_info *ip;
  17 +                       int pdp_len = strlen(path_dhclient_pid), pfx, dpfx;
  18 +
  19 +                       /* find append point: beginning of any trailing '.pid'
  20 +                        * or '-$IF.pid' */
  21 +                       for (pfx=pdp_len; (pfx >= 0) && (path_dhclient_pid[pfx] != '.') && (path_dhclient_pid[pfx] != '/'); pfx--);
  22 +                               if (pfx == -1)
  23 +                                       pfx = pdp_len;
  24 +
  25 +                       if (path_dhclient_pid[pfx] == '/')
  26 +                               pfx += 1;
  27 +
  28 +                       for (dpfx=pfx; (dpfx >= 0) && (path_dhclient_pid[dpfx] != '-') && (path_dhclient_pid[dpfx] != '/'); dpfx--);
  29 +                               if ((dpfx > -1) && (path_dhclient_pid[dpfx] != '/'))
  30 +                                       pfx = dpfx;
  31 +
  32 +                       for (ip = interfaces; ip; ip = ip->next) {
  33 +                               if (interfaces_requested && (ip->flags & (INTERFACE_REQUESTED)) && (ip->name != NULL)) {
  34 +                                       int n_len = strlen(ip->name);
  35 +
  36 +                                       new_path_dhclient_pid = (char*) malloc(pfx + n_len + 6);
  37 +                                       strncpy(new_path_dhclient_pid, path_dhclient_pid, pfx);
  38 +                                       sprintf(new_path_dhclient_pid + pfx, "-%s.pid", ip->name);
  39 +
  40 +                                       if ((pidfd = fopen(new_path_dhclient_pid, "r")) != NULL) {
  41 +                                               e = fscanf(pidfd, "%ld\n", &temp);
  42 +                                               oldpid = (pid_t)temp;
  43 +
  44 +                                               if (e != 0 && e != EOF) {
  45 +                                                       if (oldpid) {
  46 +                                                               if (kill(oldpid, SIGTERM) == 0)
  47 +                                                                       unlink(path_dhclient_pid);
  48 +                                                       }
  49 +                                               }
  50 +
  51 +                                               fclose(pidfd);
  52 +                                       }
  53 +
  54 +                                       free(new_path_dhclient_pid);
  55 +                               }
  56 +                       }
  57 +               }
  58 +       } else {
  59 +               FILE *pidfp = NULL;
  60 +               long temp = 0;
  61 +               pid_t dhcpid = 0;
  62 +               int dhc_running = 0;
  63 +               char procfn[256] = "";
  64 +
  65 +               if ((pidfp = fopen(path_dhclient_pid, "r")) != NULL) {
  66 +                       if ((fscanf(pidfp, "%ld", &temp)==1) && ((dhcpid=(pid_t)temp) > 0)) {
  67 +                               snprintf(procfn,256,"/proc/%u",dhcpid);
  68 +                               dhc_running = (access(procfn, F_OK) == 0);
  69 +                       }
  70 +
  71 +                       fclose(pidfp);
  72 +               }
  73 +
  74 +               if (dhc_running) {
  75 +                       log_fatal("dhclient(%u) is already running - exiting. ", dhcpid);
  76 +                       return(1);
  77                 }
  78         }
  79
  80 +       write_client_pid_file();
  81 +
  82         if (!quiet) {
  83                 log_info ("%s %s", message, DHCP_VERSION);
  84                 log_info (copyright);