lib/libc/ip/accept.c

   1 #include <errno.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/socket.h>
   8
   9 #include <net/netlib.h>
  10 #include <net/gen/in.h>
  11 #include <net/gen/tcp.h>
  12 #include <net/gen/tcp_io.h>
  13 #include <net/gen/udp.h>
  14 #include <net/gen/udp_io.h>
  15
  16 #define DEBUG 0
  17
  18 static int _tcp_accept(int socket, struct sockaddr *_RESTRICT address,
  19         socklen_t *_RESTRICT address_len);
  20
  21 int accept(int socket, struct sockaddr *_RESTRICT address,
  22         socklen_t *_RESTRICT address_len)
  23 {
  24         int r;
  25         nwio_udpopt_t udpopt;
  26
  27         r= _tcp_accept(socket, address, address_len);
  28         if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
  29                 return r;
  30
  31         /* Unfortunately, we have to return EOPNOTSUPP for a socket that
  32          * does not support accept (such as a UDP socket) and ENOTSOCK for
  33          * filedescriptors that do not refer to a socket.
  34          */
  35         r= ioctl(socket, NWIOGUDPOPT, &udpopt);
  36         if (r == 0)
  37         {
  38                 /* UDP socket */
  39                 errno= EOPNOTSUPP;
  40                 return -1;
  41         }
  42         if ((errno == ENOTTY || errno == EBADIOCTL))
  43         {
  44                 errno= ENOTSOCK;
  45                 return -1;
  46         }
  47
  48         return r;
  49 }
  50
  51 static int _tcp_accept(int socket, struct sockaddr *_RESTRICT address,
  52         socklen_t *_RESTRICT address_len)
  53 {
  54         int r, s1, t_errno;
  55         tcp_cookie_t cookie;
  56
  57         s1= open(TCP_DEVICE, O_RDWR);
  58         if (s1 == -1)
  59                 return s1;
  60         r= ioctl(s1, NWIOGTCPCOOKIE, &cookie);
  61         if (r == -1)
  62         {
  63                 t_errno= errno;
  64                 close(s1);
  65                 errno= t_errno;
  66                 return -1;
  67         }
  68         r= ioctl(socket, NWIOTCPACCEPTTO, &cookie);
  69         if (r == -1)
  70         {
  71                 t_errno= errno;
  72                 close(s1);
  73                 errno= t_errno;
  74                 return -1;
  75         }
  76         if (address != NULL)
  77                 getpeername(s1, address, address_len);
  78         return s1;
  79 }