minix/lib/libc/ip/sendmsg.c

139 lines
2.6 KiB
C

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