140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
#undef NDEBUG
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#include <errno.h>
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#include <net/ioctl.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#define DEBUG 0
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static ssize_t _uds_sendmsg_conn(int socket, const struct msghdr *msg,
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int flags);
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static ssize_t _uds_sendmsg_dgram(int socket, const struct msghdr *msg,
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int flags);
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ssize_t sendmsg(int socket, const struct msghdr *msg, int flags)
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{
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int r;
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int uds_sotype;
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if (msg == NULL) {
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errno= EFAULT;
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return -1;
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}
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r= ioctl(socket, NWIOGUDSSOTYPE, &uds_sotype);
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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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}
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if (uds_sotype == SOCK_DGRAM) {
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return _uds_sendmsg_dgram(socket, msg, flags);
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} else {
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return _uds_sendmsg_conn(socket, msg, flags);
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}
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}
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#if DEBUG
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fprintf(stderr, "sendmsg: 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 _uds_sendmsg_conn(int socket, const struct msghdr *msg,
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int flags)
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{
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if (flags != 0) {
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#if DEBUG
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fprintf(stderr, "sendmsg(uds): 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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/* Silently ignore destination, if given. */
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return writev(socket, msg->msg_iov, msg->msg_iovlen);
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}
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static ssize_t _uds_sendmsg_dgram(int socket, const struct msghdr *msg,
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int flags)
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{
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char real_sun_path[PATH_MAX+1];
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char *realpath_result;
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char *dest_addr;
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int null_found;
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int i, r;
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if (flags != 0) {
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#if DEBUG
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fprintf(stderr, "sendmsg(uds): 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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dest_addr = msg->msg_name;
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if (dest_addr == NULL) {
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errno= EFAULT;
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return -1;
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}
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/* sun_family is always supposed to be AF_UNIX */
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if (((struct sockaddr_un *) dest_addr)->sun_family != AF_UNIX) {
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errno = EAFNOSUPPORT;
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return -1;
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}
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/* an empty path is not supported */
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if (((struct sockaddr_un *) dest_addr)->sun_path[0] == '\0') {
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errno = ENOENT;
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return -1;
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}
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/* the path must be a null terminated string for realpath to work */
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for (null_found = i = 0;
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i < sizeof(((struct sockaddr_un *) dest_addr)->sun_path); i++) {
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if (((struct sockaddr_un *) dest_addr)->sun_path[i] == '\0') {
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null_found = 1;
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break;
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}
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}
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if (!null_found) {
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errno = EINVAL;
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return -1;
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}
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realpath_result = realpath(
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((struct sockaddr_un *) dest_addr)->sun_path, real_sun_path);
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if (realpath_result == NULL) {
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return -1;
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}
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if (strlen(real_sun_path) >= UNIX_PATH_MAX) {
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errno = ENAMETOOLONG;
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return -1;
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}
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/* set the target address */
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r= ioctl(socket, NWIOSUDSTADDR, (void *) dest_addr);
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if (r == -1) {
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return r;
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}
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/* do the send */
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return writev(socket, msg->msg_iov, msg->msg_iovlen);
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}
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