/*
- * swift implementation of syscall API
+ * Linked list management for sockets
*
- * Simulates the classic socket syscalls (socket, bind, send, recv).
- * Implementation uses raw sockets (AF_INET, SOCK_RAW).
- *
- * Subsequently, implementation is to be ported into kernel space and
- * the interface is going to be offered by the Linux syscall API.
- *
- * Heavily inspired by GLIBC's <sys/socket.h>
- * (/usr/include/sys/socket.h).
+ * Use sock_list structure to store information about sockets. Use functions
+ * to add, remove, find and update information in list.
*
* 2011, Razvan Deaconescu, razvan.deaconescu@cs.pub.ro
*/
#include <unistd.h>
#include <errno.h>
-#include "include/swift_types.h"
-#include "include/swift_list.h"
+#include "swift_types.h"
+#include "socket_manager.h"
#include "debug.h"
+#include "util.h"
+
+enum sock_bind_state {
+ STATE_NOTBOUND,
+ STATE_BOUND
+};
+
+/* socket management structure */
+struct sock_list {
+ int s;
+ struct sockaddr addr;
+ enum sock_bind_state bind_state;
+ struct sock_list *next;
+ struct sock_list *prev;
+};
+
+/* socket management list head */
+static struct sock_list sock_list_head = {
+ .next = &sock_list_head,
+ .prev = &sock_list_head
+};
/*
- * Add new socket to list. Called by sw_socket "syscall".
+ * Find socket in socket management list.
*/
-struct sock_list *list_add_socket(int s)
+static struct sock_list *list_get_link(int s)
{
- struct sock_list *ptr = malloc(sizeof(*ptr));
- if (ptr == NULL)
- return NULL;
+ struct sock_list *ptr;
- ptr->next = &sock_list_head;
- ptr->prev = sock_list_head.prev;
- sock_list_head.prev->next = ptr;
- sock_list_head.prev = ptr;
- ptr->s = s;
+ for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
+ if (ptr->s == s)
+ return ptr;
- return ptr;
+ return NULL;
}
/*
- * Bind socket to given address. Called by sw_bind "syscall".
+ * Find socket in socket management list by address.
*/
-struct sock_list *list_update_socket_address(int s, __CONST_SOCKADDR_ARG addr)
+static struct sock_list *list_get_link_by_address(const struct sockaddr *addr)
{
- struct sock_list *ptr;
+ 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));
- ptr->bind_state = STATE_BOUND;
- return ptr;
- }
+ for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
+ if (memcmp(addr, &ptr->addr, sizeof(*addr)) == 0)
+ return ptr;
- return NULL;
+ return NULL;
}
/*
- * Get list element containing socket s. Called by sw_send* "syscalls".
+ * Unlink socket from list. Called by sm_del.
*/
-struct sock_list *list_elem_from_socket(int s)
+static void list_unlink(struct sock_list *ptr)
{
- struct sock_list *ptr;
+ ptr->next->prev = ptr->prev;
+ ptr->prev->next = ptr->next;
+ ptr->next = ptr;
+ ptr->prev = ptr;
+}
- for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
- if (ptr->s == s)
- return ptr;
+/*
+ * Link socket to list. Add socket to tail of list.
+ */
- return NULL;
+static void list_link(struct sock_list *ptr)
+{
+ ptr->next = &sock_list_head;
+ ptr->prev = sock_list_head.prev;
+ sock_list_head.prev->next = ptr;
+ sock_list_head.prev = ptr;
}
/*
- * Get list element containing address addr. Called by sw_bind "syscall".
+ * Add new socket to list. Called by sw_socket "syscall".
*/
-struct sock_list *list_elem_from_address(__CONST_SOCKADDR_ARG addr)
+int sm_add(int s)
{
- struct sock_list *ptr;
-
- for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next) {
- dprintf("socket address to be checked\n");
- if (ptr->bind_state == STATE_NOTBOUND)
- continue;
- dprintf("bound socket address to be checked\n");
- if (memcmp(&ptr->addr, addr, sizeof(addr)) == 0)
- return ptr;
- }
-
- return NULL;
+ struct sock_list *ptr = malloc(sizeof(*ptr));
+ if (ptr == NULL)
+ return -1;
+
+ ptr->s = s;
+ list_link(ptr);
+
+ return 0;
}
/*
- * Unlink socket from list. Called by list_remove_socket.
+ * Bind socket to given address. Called by sw_bind "syscall".
*/
-static struct sock_list *list_unlink_socket(int s)
+
+int sm_update_address(int s, const struct sockaddr *addr)
{
- 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;
+ struct sock_list *ptr;
+
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return -1;
+
+ memcpy(&ptr->addr, addr, sizeof(ptr->addr));
+
+ return 0;
}
/*
* Remove socket from list. Called by sw_close "syscall".
*/
-int list_remove_socket(int s)
+int sm_del(int s)
{
- struct sock_list *ptr;
+ struct sock_list *ptr;
+
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return -1;
- ptr = list_unlink_socket(s);
- if (ptr == NULL)
- return -1;
+ list_unlink(ptr);
+ free(ptr);
- free(ptr);
- return 0;
+ return 0;
}
/*
* Check if a socket is bound.
*/
-int list_socket_is_bound(int s)
+
+int sm_is_bound(int s)
+{
+ struct sock_list *ptr;
+
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return 0;
+
+ if (ptr->bind_state == STATE_BOUND)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Mark socket as bound.
+ */
+
+int sm_mark_bound(int s)
+{
+ struct sock_list *ptr;
+
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return -1;
+
+ ptr->bind_state = STATE_BOUND;
+
+ return 0;
+}
+
+/*
+ * Mark socket as unbound.
+ */
+
+int sm_mark_unbound(int s)
+{
+ struct sock_list *ptr;
+
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return -1;
+
+ ptr->bind_state = STATE_NOTBOUND;
+
+ return 0;
+}
+
+/*
+ * Check if adress is asociated with a given socket.
+ */
+
+int sm_address_exists(const struct sockaddr *addr)
+{
+ struct sock_list *ptr;
+
+ ptr = list_get_link_by_address(addr);
+ if (ptr == NULL)
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Find socket address.
+ */
+
+struct sockaddr *sm_get_address(int s)
{
- struct sock_list *ptr;
+ struct sock_list *ptr;
- for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
- if (ptr->s == s) {
- if (ptr->bind_state == STATE_BOUND)
- return 1;
- break;
- }
+ ptr = list_get_link(s);
+ if (ptr == NULL)
+ return NULL;
- return 0;
+ return &ptr->addr;
}
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