/*
- * swift implementation of syscall API>
+ * swift implementation of syscall API
*
* Simulates the classic socket syscalls (socket, bind, send, recv).
* Implementation uses raw sockets (AF_INET, SOCK_RAW).
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
+#include <unistd.h>
+#include <errno.h>
-#include "swift_types.h"
-#include "swift_raw.h"
-
-/* socket management structure */
-struct sock_list {
- int s;
- struct sockaddr_sw addr;
- struct sock_list *next;
- struct sock_list *prev;
-};
-
-static struct sock_list sock_list_head = {
- .next = &sock_list_head,
- .prev = &sock_list_head
-};
-
-static struct sock_list *list_add_socket(int s)
-{
- struct sock_list *ptr = malloc(sizeof(*ptr));
- if (ptr == NULL)
- return NULL;
-
- ptr->next = &sock_list_head;
- ptr->prev = sock_list_head.prev;
- sock_list_head.prev->next = ptr;
- sock_list_head.prev = ptr;
-
- return ptr;
-}
-
-static struct sock_list *list_update_socket_address(int s, struct sockaddr_sw *addr)
-{
- struct sock_list *ptr;
-
- for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
- if (ptr->s == s) {
- memcpy(&ptr->addr, addr, sizeof(ptr->addr));
- return ptr;
- }
-
- return NULL;
-}
-
-static struct sock_list *list_unlink_socket(int s)
-{
- struct sock_list *ptr;
-
- for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
- if (ptr->s == s) {
- ptr->next->prev = ptr->prev;
- ptr->prev->next = ptr->next;
- ptr->next = ptr;
- ptr->prev = ptr;
- return ptr;
- }
-
- return NULL;
-}
+#include "include/swift_types.h"
+#include "include/swift_raw.h"
+#include "include/swift_list.h"
/*
* Create a new socket of type TYPE in domain DOMAIN, using
*
* swift: PROTOCOL is IPPROTO_SWIFT. Ignore TYPE.
*/
-int sw_socket (int __domain, int __type, int __protocol)
+int sw_socket(int __domain, int __type, int __protocol)
{
int s;
+ struct sock_list *list;
+
+ if (__domain != PF_INET || __type != SOCK_DGRAM || __protocol != IPPROTO_SWIFT) {
+ errno = EINVAL;
+ goto sock_err;
+ }
+
+ s = socket(PF_INET, SOCK_RAW, IPPROTO_SWIFT);
+ if (s < 0) {
+ goto sock_err;
+ }
- s = socket(__domain, SOCK_RAW, IPPROTO_SWIFT);
+ list = list_add_socket(s);
+ if (list == NULL) {
+ errno = ENOMEM;
+ goto list_add_err;
+ }
+
+ /* Socket is not bound. */
+ list->bind_state = STATE_NOTBOUND;
return s;
+
+list_add_err:
+ close(s);
+sock_err:
+ return -1;
}
/*
*
* swift: ADDR is of type struct sockaddr_sw.
*/
-int sw_bind (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len)
+int sw_bind(int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len)
{
- /* TODO */
+ struct sock_list *list;
+ int rc;
+
+ rc = list_socket_is_bound(__fd);
+ if (rc == 1) {
+ errno = EINVAL;
+ goto socket_bound_err;
+ }
+
+ /* Check whether address is already in use. */
+ list = list_elem_from_address(__addr);
+ if (list != NULL) {
+ errno = EADDRINUSE;
+ goto list_elem_err;
+ }
+
+ /* Update __fd entry in socket management list. */
+ list = list_update_socket_address(__fd, __addr);
+ if (list == NULL) {
+ errno = EBADF;
+ goto list_update_err;
+ }
return 0;
+
+socket_bound_err:
+list_update_err:
+list_elem_err:
+ return -1;
}
/* Put the local address of FD into *ADDR and its length in *LEN. */
-int sw_getsockname (int __fd, __SOCKADDR_ARG __addr,
+int sw_getsockname(int __fd, __SOCKADDR_ARG __addr,
socklen_t *__restrict __len)
{
- /* TODO */
+ struct sock_list *list;
+
+ /* Find socket in management structure. */
+ list = list_elem_from_socket(__fd);
+ if (list == NULL) {
+ errno = EBADF;
+ goto list_elem_err;
+ }
+
+ memcpy(__addr, &list->addr, sizeof(list->addr));
+ *__len = sizeof(list->addr);
return 0;
+
+list_elem_err:
+ return -1;
}
/*
* This function is a cancellation point and therefore not marked with
* __THROW.
*/
-ssize_t sw_sendto (int __fd, __const void *__buf, size_t __n,
+ssize_t sw_sendto(int __fd, __const void *__buf, size_t __n,
int __flags, __CONST_SOCKADDR_ARG __addr,
socklen_t __addr_len)
{
ssize_t bytes_sent;
-
- /* TODO */
-
- return bytes_sent;
+ struct sock_list *list;
+ struct iovec __iov[1];
+ struct msghdr __msgh;
+ struct sockaddr_sw *__sw_addr = (struct sockaddr_sw *) __addr;
+
+ list = list_elem_from_socket(__fd);
+ if (list != NULL && list->bind_state == STATE_NOTBOUND) {
+ errno = EAFNOSUPPORT;
+ goto sock_err;
+ }
+
+ {
+ char str[INET_ADDRSTRLEN];
+
+ inet_ntop(AF_INET, &(__sw_addr->sin_addr), str, INET_ADDRSTRLEN);
+ printf("=== ADDR: %s ===\n", str);
+ }
+
+ /* Specify the components of the message in an "iovec". */
+ __iov[0].iov_base = (void *) __buf;
+ __iov[0].iov_len = __n;
+
+ /* The message header contains parameters for sendmsg. */
+ __msgh.msg_name = (caddr_t) __addr;
+ __msgh.msg_namelen = sizeof(__addr);
+ __msgh.msg_iov = __iov;
+ __msgh.msg_iovlen = 1;
+ __msgh.msg_control = NULL; /* irrelevant to AF_INET */
+ __msgh.msg_controllen = 0; /* irrelevant to AF_INET */
+
+ return sendmsg(__fd, &__msgh, 0);
+
+sock_err:
+ return -1;
}
/*
* This function is a cancellation point and therefore not marked with
* __THROW.
*/
-ssize_t sw_recvfrom (int __fd, void *__restrict __buf, size_t __n,
+ssize_t sw_recvfrom(int __fd, void *__restrict __buf, size_t __n,
int __flags, __SOCKADDR_ARG __addr,
socklen_t *__restrict __addr_len)
{
ssize_t bytes_recv;
-
+ struct sock_list *list;
+ struct iovec __iov[1];
+ struct msghdr __msgh;
+ struct sockaddr_sw *__sw_addr = (struct sockaddr_sw *) __addr;
+
+ list = list_elem_from_socket(__fd);
+ if (list != NULL && list->bind_state == STATE_NOTBOUND) {
+ errno = EAFNOSUPPORT;
+ goto sock_err;
+ }
+
/* TODO */
- return bytes_recv;
+ return recvmsg(__fd, &__msgh, 0);
+
+sock_err:
+ return -1;
}
/*
* This function is a cancellation point and therefore not marked with
* __THROW.
*/
-ssize_t sw_sendmsg (int __fd, __const struct msghdr *__message,
+ssize_t sw_sendmsg(int __fd, __const struct msghdr *__message,
int __flags)
{
ssize_t bytes_sent;
/* TODO */
-
- return bytes_sent;
+
+ return sendmsg(__fd, __message, __flags);
}
/*
* This function is a cancellation point and therefore not marked with
* __THROW.
*/
-ssize_t sw_recvmsg (int __fd, struct msghdr *__message, int __flags)
+ssize_t sw_recvmsg(int __fd, struct msghdr *__message, int __flags)
{
ssize_t bytes_recv;
/* TODO */
- return bytes_recv;
+ return recvmsg(__fd, __message, __flags);
}
/*
* LEVEL into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the
* value's actual length. Returns 0 on success, -1 for errors.
*/
-int sw_getsockopt (int __fd, int __level, int __optname,
+int sw_getsockopt(int __fd, int __level, int __optname,
void *__restrict __optval,
socklen_t *__restrict __optlen)
{
* to *OPTVAL (which is OPTLEN bytes long).
* Returns 0 on success, -1 for errors.
*/
-
-int sw_setsockopt (int __fd, int __level, int __optname,
+int sw_setsockopt(int __fd, int __level, int __optname,
__const void *__optval, socklen_t __optlen)
{
/* Call classical interface of setsockopt(2). */
}
/*
- * Shut down all or part of the connection open on socket FD.
- * HOW determines what to shut down:
- * SHUT_RD = No more receptions;
- * SHUT_WR = No more transmissions;
- * SHUT_RDWR = No more receptions or transmissions.
+ * Close file descriptor for socket FD.
* Returns 0 on success, -1 for errors.
*/
-int sw_shutdown (int __fd, int __how)
+int sw_close(int __fd)
{
- /* Call classical interface of shutdown(2). */
- return shutdown(__fd, __how);
+ int rc;
+
+ /* Remove socket from socket management structure. */
+ rc = list_remove_socket(__fd);
+ if (rc < 0) {
+ errno = EBADF;
+ goto list_unlink_err;
+ }
+
+ /* Call classical interface of close(2). */
+ return close(__fd);
+
+list_unlink_err:
+ return -1;
}