120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#undef NDEBUG
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.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_recvfrom(int socket, void *_RESTRICT buffer, size_t length,
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int flags, struct sockaddr *_RESTRICT address,
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socklen_t *_RESTRICT address_len, nwio_udpopt_t *udpoptp);
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ssize_t recvfrom(int socket, void *_RESTRICT buffer, size_t length,
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int flags, struct sockaddr *_RESTRICT address,
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socklen_t *_RESTRICT address_len)
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{
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int r;
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nwio_udpopt_t udpopt;
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fprintf(stderr, "recvfrom: for fd %d\n", socket);
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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_recvfrom(socket, buffer, length, flags,
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address, address_len, &udpopt);
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}
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#if DEBUG
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fprintf(stderr, "recvfrom: not implemented for fd %d\n", socket);
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#endif
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errno= ENOSYS;
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assert(0);
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return -1;
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}
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static ssize_t _udp_recvfrom(int socket, void *_RESTRICT buffer, size_t length,
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int flags, struct sockaddr *_RESTRICT address,
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socklen_t *_RESTRICT address_len, nwio_udpopt_t *udpoptp)
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{
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int r, t_errno;
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size_t buflen, len;
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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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struct sockaddr_in sin;
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if (flags)
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{
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#if DEBUG
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fprintf(stderr, "recvfrom(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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{
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#if DEBUG
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fprintf(stderr,
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"recvfrom(udp): NWUO_RWDATONLY 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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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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r= read(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 >= sizeof(*io_hdrp));
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length= r-sizeof(*io_hdrp);
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io_hdrp= buf;
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memcpy(buffer, &io_hdrp[1], length);
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if (address != NULL)
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{
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sin.sin_family= AF_INET;
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sin.sin_addr.s_addr= io_hdrp->uih_src_addr;
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sin.sin_port= io_hdrp->uih_src_port;
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len= *address_len;
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if (len > sizeof(sin))
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len= sizeof(sin);
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memcpy(address, &sin, len);
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*address_len= sizeof(sin);
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}
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free(buf);
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return length;
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}
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