minix/lib/libc/sys/getpeername.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <errno.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <sys/ioctl.h>
   9 #include <sys/socket.h>
  10 #include <netinet/in.h>
  11
  12 #include <net/gen/in.h>
  13 #include <net/gen/tcp.h>
  14 #include <net/gen/tcp_io.h>
  15 #include <net/gen/udp.h>
  16 #include <net/gen/udp_io.h>
  17 #include <sys/un.h>
  18
  19 static int _tcp_getpeername(int sock, struct sockaddr *__restrict address,
  20         socklen_t *__restrict address_len, nwio_tcpconf_t *tcpconfp);
  21
  22 static int _udp_getpeername(int sock, struct sockaddr *__restrict address,
  23         socklen_t *__restrict address_len, nwio_udpopt_t *tcpconfp);
  24
  25 static int _uds_getpeername(int sock, struct sockaddr *__restrict address,
  26         socklen_t *__restrict address_len, struct sockaddr_un *uds_addr);
  27
  28 /*
  29  * Get the remote address of a socket.
  30  */
  31 static int
  32 __getpeername(int fd, struct sockaddr * __restrict address,
  33         socklen_t * __restrict address_len)
  34 {
  35         message m;
  36
  37         if (address_len == NULL) {
  38                 errno = EFAULT;
  39                 return -1;
  40         }
  41
  42         memset(&m, 0, sizeof(m));
  43         m.m_lc_vfs_sockaddr.fd = fd;
  44         m.m_lc_vfs_sockaddr.addr = (vir_bytes)address;
  45         m.m_lc_vfs_sockaddr.addr_len = *address_len;
  46
  47         if (_syscall(VFS_PROC_NR, VFS_GETPEERNAME, &m) < 0)
  48                 return -1;
  49
  50         *address_len = m.m_vfs_lc_socklen.len;
  51         return 0;
  52 }
  53
  54 int getpeername(int sock, struct sockaddr *__restrict address,
  55         socklen_t *__restrict address_len)
  56 {
  57         int r;
  58         nwio_tcpconf_t tcpconf;
  59         nwio_udpopt_t udpopt;
  60         struct sockaddr_un uds_addr;
  61
  62         r = __getpeername(sock, address, address_len);
  63         if (r != -1 || (errno != ENOTSOCK && errno != ENOSYS))
  64                 return r;
  65
  66         r= ioctl(sock, NWIOGTCPCONF, &tcpconf);
  67         if (r != -1 || errno != ENOTTY)
  68         {
  69                 if (r == -1)
  70                 {
  71                         /* Bad file descriptor */
  72                         return -1;
  73                 }
  74                 return _tcp_getpeername(sock, address, address_len,
  75                         &tcpconf);
  76         }
  77
  78         r= ioctl(sock, NWIOGUDPOPT, &udpopt);
  79         if (r != -1 || errno != ENOTTY)
  80         {
  81                 if (r == -1)
  82                 {
  83                         /* Bad file descriptor */
  84                         return -1;
  85                 }
  86                 return _udp_getpeername(sock, address, address_len,
  87                         &udpopt);
  88         }
  89
  90         r= ioctl(sock, NWIOGUDSPADDR, &uds_addr);
  91         if (r != -1 || errno != ENOTTY)
  92         {
  93                 if (r == -1)
  94                 {
  95                         /* Bad file descriptor */
  96                         return -1;
  97                 }
  98                 return _uds_getpeername(sock, address, address_len,
  99                         &uds_addr);
 100         }
 101
 102         errno = ENOTSOCK;
 103         return -1;
 104 }
 105
 106 static int _tcp_getpeername(int sock, struct sockaddr *__restrict address,
 107         socklen_t *__restrict address_len, nwio_tcpconf_t *tcpconfp)
 108 {
 109         socklen_t len;
 110         struct sockaddr_in sin;
 111
 112         if (tcpconfp->nwtc_remaddr == 0 ||
 113                 tcpconfp->nwtc_remport == 0)
 114         {
 115                 errno= ENOTCONN;
 116                 return -1;
 117         }
 118
 119         memset(&sin, '\0', sizeof(sin));
 120         sin.sin_family= AF_INET;
 121         sin.sin_addr.s_addr= tcpconfp->nwtc_remaddr;
 122         sin.sin_port= tcpconfp->nwtc_remport;
 123         sin.sin_len = sizeof(sin);
 124
 125         len= *address_len;
 126         if (len > sizeof(sin))
 127                 len= sizeof(sin);
 128         memcpy(address, &sin, len);
 129         *address_len= len;
 130
 131         return 0;
 132 }
 133
 134 static int _udp_getpeername(int sock, struct sockaddr *__restrict address,
 135         socklen_t *__restrict address_len, nwio_udpopt_t *udpopt)
 136 {
 137         socklen_t len;
 138         struct sockaddr_in sin;
 139
 140         if (udpopt->nwuo_remaddr == 0 ||
 141                 udpopt->nwuo_remport == 0)
 142         {
 143                 errno= ENOTCONN;
 144                 return -1;
 145         }
 146
 147         memset(&sin, '\0', sizeof(sin));
 148         sin.sin_family= AF_INET;
 149         sin.sin_addr.s_addr= udpopt->nwuo_remaddr;
 150         sin.sin_port= udpopt->nwuo_remport;
 151         sin.sin_len = sizeof(sin);
 152
 153         len= *address_len;
 154         if (len > sizeof(sin))
 155                 len= sizeof(sin);
 156         memcpy(address, &sin, len);
 157         *address_len= len;
 158
 159         return 0;
 160 }
 161
 162 static int _uds_getpeername(int sock, struct sockaddr *__restrict address,
 163         socklen_t *__restrict address_len, struct sockaddr_un *uds_addr)
 164 {
 165         socklen_t len;
 166
 167         if (uds_addr->sun_family != AF_UNIX)
 168         {
 169                 errno= ENOTCONN;
 170                 return -1;
 171         }
 172
 173         len= *address_len;
 174         if (len > sizeof(struct sockaddr_un))
 175                 len = sizeof(struct sockaddr_un);
 176
 177         memcpy(address, uds_addr, len);
 178         *address_len= len;
 179
 180         return 0;
 181 }