124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
#undef NDEBUG
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/gen/in.h>
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#include <net/gen/udp.h>
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#include <net/gen/udp_hdr.h>
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#include <net/gen/udp_io.h>
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#define DEBUG 0
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static ssize_t _udp_sendto(int socket, const void *message, size_t length,
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int flags, const struct sockaddr *dest_addr, socklen_t dest_len,
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nwio_udpopt_t *udpoptp);
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ssize_t sendto(int socket, const void *message, size_t length, int flags,
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const struct sockaddr *dest_addr, socklen_t dest_len)
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{
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int r;
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nwio_udpopt_t udpopt;
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r= ioctl(socket, NWIOGUDPOPT, &udpopt);
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if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
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{
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if (r == -1)
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return r;
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return _udp_sendto(socket, message, length, flags,
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dest_addr, dest_len, &udpopt);
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}
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#if DEBUG
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fprintf(stderr, "sendto: not implemented for fd %d\n", socket);
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#endif
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errno= ENOSYS;
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return -1;
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}
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static ssize_t _udp_sendto(int socket, const void *message, size_t length,
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int flags, const struct sockaddr *dest_addr, socklen_t dest_len,
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nwio_udpopt_t *udpoptp)
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{
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int r, t_errno;
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size_t buflen;
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void *buf;
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struct sockaddr_in *sinp;
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udp_io_hdr_t *io_hdrp;
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if (flags)
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{
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#if DEBUG
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fprintf(stderr, "sendto(udp): flags not implemented\n");
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#endif
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errno= ENOSYS;
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return -1;
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}
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if (udpoptp->nwuo_flags & NWUO_RWDATONLY)
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return write(socket, message, length);
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if ((udpoptp->nwuo_flags & NWUO_RP_ANY) ||
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(udpoptp->nwuo_flags & NWUO_RA_ANY))
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{
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/* Check destination address */
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if (dest_len < sizeof(*sinp))
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{
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errno= EINVAL;
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return -1;
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}
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sinp= (struct sockaddr_in *)dest_addr;
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if (sinp->sin_family != AF_INET)
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{
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errno= EAFNOSUPPORT;
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return -1;
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}
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}
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buflen= sizeof(*io_hdrp) + length;
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if (buflen < length)
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{
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/* Overflow */
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errno= EMSGSIZE;
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return -1;
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}
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buf= malloc(buflen);
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if (buf == NULL)
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return -1;
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io_hdrp= buf;
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io_hdrp->uih_src_addr= 0; /* Unused */
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io_hdrp->uih_src_port= 0; /* Will cause error if NWUO_LP_ANY */
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if (udpoptp->nwuo_flags & NWUO_RA_ANY)
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io_hdrp->uih_dst_addr= sinp->sin_addr.s_addr;
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else
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io_hdrp->uih_dst_addr= 0;
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if (udpoptp->nwuo_flags & NWUO_RP_ANY)
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io_hdrp->uih_dst_port= sinp->sin_port;
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else
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io_hdrp->uih_dst_port= 0;
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io_hdrp->uih_ip_opt_len= 0;
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io_hdrp->uih_data_len= 0;
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memcpy(&io_hdrp[1], message, length);
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r= write(socket, buf, buflen);
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if (r == -1)
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{
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t_errno= errno;
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free(buf);
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errno= t_errno;
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return -1;
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}
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assert(r == buflen);
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free(buf);
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return length;
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}
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