minix/lib/ip/getsockopt.c

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#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/tcp.h>
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#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>
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#define DEBUG 0
static int _tcp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);
static int _udp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);
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static void getsockopt_copy(void *return_value, size_t return_len,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);
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int getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
int r;
nwio_tcpopt_t tcpopt;
nwio_udpopt_t udpopt;
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r= ioctl(socket, NWIOGTCPOPT, &tcpopt);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _tcp_getsockopt(socket, level, option_name,
option_value, option_len);
}
r= ioctl(socket, NWIOGUDPOPT, &udpopt);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _udp_getsockopt(socket, level, option_name,
option_value, option_len);
}
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#if DEBUG
fprintf(stderr, "getsockopt: not implemented for fd %d\n", socket);
#endif
errno= ENOTSOCK;
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return -1;
}
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static void getsockopt_copy(void *return_value, size_t return_len,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
/* copy as much data as possible */
if (*option_len < return_len)
memcpy(option_value, return_value, *option_len);
else
memcpy(option_value, return_value, return_len);
/* return length */
*option_len = return_len;
}
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static int _tcp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
int i, r, err;
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if (level == SOL_SOCKET && option_name == SO_REUSEADDR)
{
i = 1; /* Binds to TIME_WAIT sockets never cause errors */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
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if (level == SOL_SOCKET && option_name == SO_KEEPALIVE)
{
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i = 1; /* Keepalive is always on */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
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return 0;
}
if (level == SOL_SOCKET && option_name == SO_ERROR)
{
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r = ioctl(socket, NWIOTCPGERROR, &err);
if (r != 0)
return r;
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getsockopt_copy(&err, sizeof(err), option_value, option_len);
return 0;
}
if (level == SOL_SOCKET && option_name == SO_RCVBUF)
{
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i = 32 * 1024; /* Receive buffer in the current
* implementation
*/
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getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
if (level == SOL_SOCKET && option_name == SO_SNDBUF)
{
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i = 32 * 1024; /* Send buffer in the current implementation */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
if (level == SOL_SOCKET && option_name == SO_TYPE)
{
i = SOCK_STREAM; /* this is a TCP socket */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
if (level == IPPROTO_TCP && option_name == TCP_NODELAY)
{
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i = 0; /* nodelay is always off */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
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#if DEBUG
fprintf(stderr, "_tcp_getsocketopt: level %d, name %d\n",
level, option_name);
#endif
errno= ENOPROTOOPT;
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return -1;
}
static int _udp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
int i;
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if (level == SOL_SOCKET && option_name == SO_TYPE)
{
i = SOCK_DGRAM; /* this is a TCP socket */
getsockopt_copy(&i, sizeof(i), option_value, option_len);
return 0;
}
#if DEBUG
fprintf(stderr, "_udp_getsocketopt: level %d, name %d\n",
level, option_name);
#endif
errno= ENOSYS;
return -1;
}