minix/lib/libc/ip/sendto.c

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#undef NDEBUG
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
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#include <net/gen/udp.h>
#include <net/gen/udp_hdr.h>
#include <net/gen/udp_io.h>
#define DEBUG 0
static ssize_t _tcp_sendto(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len);
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static ssize_t _udp_sendto(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len,
nwio_udpopt_t *udpoptp);
static ssize_t _uds_sendto_conn(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len);
static ssize_t _uds_sendto_dgram(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len);
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ssize_t sendto(int socket, const void *message, size_t length, int flags,
const struct sockaddr *dest_addr, socklen_t dest_len)
{
int r;
nwio_tcpopt_t tcpopt;
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nwio_udpopt_t udpopt;
struct sockaddr_un uds_addr;
int uds_sotype = -1;
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r= ioctl(socket, NWIOGTCPOPT, &tcpopt);
if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
{
if (r == -1)
return r;
return _tcp_sendto(socket, message, length, flags,
dest_addr, dest_len);
}
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r= ioctl(socket, NWIOGUDPOPT, &udpopt);
if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
{
if (r == -1)
return r;
return _udp_sendto(socket, message, length, flags,
dest_addr, dest_len, &udpopt);
}
r= ioctl(socket, NWIOGUDSSOTYPE, &uds_sotype);
if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
{
if (r == -1) {
return r;
}
if (uds_sotype == SOCK_DGRAM) {
return _uds_sendto_dgram(socket, message,
length, flags,dest_addr, dest_len);
} else {
return _uds_sendto_conn(socket, message,
length, flags, dest_addr, dest_len);
}
}
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#if DEBUG
fprintf(stderr, "sendto: not implemented for fd %d\n", socket);
#endif
errno= ENOSYS;
return -1;
}
static ssize_t _tcp_sendto(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len)
{
if (flags != 0) {
#if DEBUG
fprintf(stderr, "sendto(tcp): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
/* Silently ignore destination, if given. */
return write(socket, message, length);
}
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static ssize_t _udp_sendto(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len,
nwio_udpopt_t *udpoptp)
{
int r, t_errno;
size_t buflen;
void *buf;
struct sockaddr_in *sinp;
udp_io_hdr_t *io_hdrp;
if (flags)
{
#if DEBUG
fprintf(stderr, "sendto(udp): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
if (udpoptp->nwuo_flags & NWUO_RWDATONLY)
return write(socket, message, length);
if ((udpoptp->nwuo_flags & NWUO_RP_ANY) ||
(udpoptp->nwuo_flags & NWUO_RA_ANY))
{
if (!dest_addr)
{
errno= ENOTCONN;
return -1;
}
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/* Check destination address */
if (dest_len < sizeof(*sinp))
{
errno= EINVAL;
return -1;
}
sinp= (struct sockaddr_in *)dest_addr;
if (sinp->sin_family != AF_INET)
{
errno= EAFNOSUPPORT;
return -1;
}
}
buflen= sizeof(*io_hdrp) + length;
if (buflen < length)
{
/* Overflow */
errno= EMSGSIZE;
return -1;
}
buf= malloc(buflen);
if (buf == NULL)
return -1;
io_hdrp= buf;
io_hdrp->uih_src_addr= 0; /* Unused */
io_hdrp->uih_src_port= 0; /* Will cause error if NWUO_LP_ANY */
if (udpoptp->nwuo_flags & NWUO_RA_ANY)
io_hdrp->uih_dst_addr= sinp->sin_addr.s_addr;
else
io_hdrp->uih_dst_addr= 0;
if (udpoptp->nwuo_flags & NWUO_RP_ANY)
io_hdrp->uih_dst_port= sinp->sin_port;
else
io_hdrp->uih_dst_port= 0;
io_hdrp->uih_ip_opt_len= 0;
io_hdrp->uih_data_len= 0;
memcpy(&io_hdrp[1], message, length);
r= write(socket, buf, buflen);
if (r == -1)
{
t_errno= errno;
free(buf);
errno= t_errno;
return -1;
}
assert(r == buflen);
free(buf);
return length;
}
static ssize_t _uds_sendto_conn(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len)
{
/* for connection oriented unix domain sockets (SOCK_STREAM /
* SOCK_SEQPACKET)
*/
if (flags != 0) {
#if DEBUG
fprintf(stderr, "sendto(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
/* Silently ignore destination, if given. */
return write(socket, message, length);
}
static ssize_t _uds_sendto_dgram(int socket, const void *message, size_t length,
int flags, const struct sockaddr *dest_addr, socklen_t dest_len)
{
int r;
/* for connectionless unix domain sockets (SOCK_DGRAM) */
if (flags != 0) {
#if DEBUG
fprintf(stderr, "sendto(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
if (dest_addr == NULL) {
errno = EFAULT;
return -1;
}
/* set the target address */
r= ioctl(socket, NWIOSUDSTADDR, (void *) dest_addr);
if (r == -1) {
return r;
}
/* do the send */
return write(socket, message, length);
}