util.c

   1 /* Misc util functions */
   2
   3 char const *cvs_id_util = "$Id: util.c,v 1.5 2004-11-05 04:55:27 bodea Exp $";
   4
   5 #include <unistd.h>
   6 #include <errno.h>
   7 #include <sched.h>
   8 #include <sys/socket.h>
   9 #include <netinet/in.h>
  10 #include <arpa/inet.h>
  11 #include <string.h>
  12 #include <sys/mman.h>
  13
  14 #include "l2tpns.h"
  15 #ifdef BGP
  16 #include "bgp.h"
  17 #endif
  18
  19 char *inet_toa(unsigned long addr)
  20 {
  21         struct in_addr in;
  22         memcpy(&in, &addr, sizeof(unsigned long));
  23         return inet_ntoa(in);
  24 }
  25
  26 void *shared_malloc(unsigned int size)
  27 {
  28         void * p;
  29         p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
  30
  31         if (p == MAP_FAILED)
  32                 p = NULL;
  33
  34         return p;
  35 }
  36
  37 extern int udpfd, tunfd, snoopfd, ifrfd, cluster_sockfd;
  38 extern int *radfds;
  39
  40 pid_t fork_and_close()
  41 {
  42         pid_t pid = fork();
  43         int i;
  44
  45         if (pid)
  46                 return pid;
  47
  48         if (config->scheduler_fifo)
  49         {
  50                 struct sched_param params = {0};
  51                 params.sched_priority = 0;
  52                 if (sched_setscheduler(0, SCHED_OTHER, &params))
  53                 {
  54                         LOG(0, 0, 0, 0, "Error setting scheduler to OTHER after fork: %s\n", strerror(errno));
  55                         LOG(0, 0, 0, 0, "This is probably really really bad.\n");
  56                 }
  57         }
  58
  59         signal(SIGPIPE, SIG_DFL);
  60         signal(SIGCHLD, SIG_DFL);
  61         signal(SIGHUP, SIG_DFL);
  62         signal(SIGUSR1, SIG_DFL);
  63         signal(SIGQUIT, SIG_DFL);
  64         signal(SIGKILL, SIG_DFL);
  65         signal(SIGALRM, SIG_DFL);
  66         signal(SIGTERM, SIG_DFL);
  67
  68         // Close sockets
  69         if (udpfd) close(udpfd); udpfd = 0;
  70         if (tunfd) close(tunfd); tunfd = 0;
  71         if (snoopfd) close(snoopfd); snoopfd = 0;
  72         for (i = 0; i < config->num_radfds; i++)
  73                 if (radfds[i]) close(radfds[i]);
  74         if (ifrfd) close(ifrfd); ifrfd = 0;
  75         if (cluster_sockfd) close(cluster_sockfd); cluster_sockfd = 0;
  76         if (clifd) close(clifd); clifd = 0;
  77 #ifdef BGP
  78         for (i = 0; i < BGP_NUM_PEERS; i++)
  79                 if (bgp_peers[i].sock != -1)
  80                         close(bgp_peers[i].sock);
  81 #endif /* BGP */
  82
  83         return pid;
  84 }