lib/ip/getpeername.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <sys/ioctl.h>
   5 #include <sys/socket.h>
   6 #include <netinet/in.h>
   7
   8 #include <net/gen/in.h>
   9 #include <net/gen/tcp.h>
  10 #include <net/gen/tcp_io.h>
  11 #include <net/gen/udp.h>
  12 #include <net/gen/udp_io.h>
  13
  14 #define DEBUG 0
  15
  16 static int _tcp_getpeername(int socket, struct sockaddr *_RESTRICT address,
  17         socklen_t *_RESTRICT address_len, nwio_tcpconf_t *tcpconfp);
  18
  19 int getpeername(int socket, struct sockaddr *_RESTRICT address,
  20         socklen_t *_RESTRICT address_len)
  21 {
  22         int r;
  23         nwio_tcpconf_t tcpconf;
  24
  25         r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
  26         if (r != -1 || errno != ENOTTY)
  27         {
  28                 if (r == -1)
  29                 {
  30                         /* Bad file descriptor */
  31                         return -1;
  32                 }
  33                 return _tcp_getpeername(socket, address, address_len,
  34                         &tcpconf);
  35         }
  36
  37 #if DEBUG
  38         fprintf(stderr, "getpeername: not implemented for fd %d\n", socket);
  39 #endif
  40         errno= ENOSYS;
  41         return -1;
  42 }
  43
  44 static int _tcp_getpeername(int socket, struct sockaddr *_RESTRICT address,
  45         socklen_t *_RESTRICT address_len, nwio_tcpconf_t *tcpconfp)
  46 {
  47         socklen_t len;
  48         struct sockaddr_in sin;
  49
  50         if (tcpconfp->nwtc_remaddr == 0 ||
  51                 tcpconfp->nwtc_remport == 0)
  52         {
  53                 errno= ENOTCONN;
  54                 return -1;
  55         }
  56
  57         memset(&sin, '\0', sizeof(sin));
  58         sin.sin_family= AF_INET;
  59         sin.sin_addr.s_addr= tcpconfp->nwtc_remaddr;
  60         sin.sin_port= tcpconfp->nwtc_remport;
  61
  62         len= *address_len;
  63         if (len > sizeof(sin))
  64                 len= sizeof(sin);
  65         memcpy(address, &sin, len);
  66         *address_len= len;
  67
  68         return 0;
  69 }
  70