2 * swift implementation of syscall API
4 * Simulates the classic socket syscalls (socket, bind, send, recv).
5 * Implementation uses raw sockets (AF_INET, SOCK_RAW).
7 * Subsequently, implementation is to be ported into kernel space and
8 * the interface is going to be offered by the Linux syscall API.
10 * Heavily inspired by GLIBC's <sys/socket.h>
11 * (/usr/include/sys/socket.h).
13 * 2011, Razvan Deaconescu, razvan.deaconescu@cs.pub.ro
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
25 #include "swift_types.h"
26 #include "swift_list.h"
31 * Add new socket to list. Called by sw_socket "syscall".
34 struct sock_list *list_add_socket(int s)
36 struct sock_list *ptr = malloc(sizeof(*ptr));
40 ptr->next = &sock_list_head;
41 ptr->prev = sock_list_head.prev;
42 sock_list_head.prev->next = ptr;
43 sock_list_head.prev = ptr;
50 * Bind socket to given address. Called by sw_bind "syscall".
53 struct sock_list *list_update_socket_address(int s, __CONST_SOCKADDR_ARG addr)
55 struct sock_list *ptr;
57 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
59 memcpy(&ptr->addr, addr, sizeof(ptr->addr));
60 ptr->bind_state = STATE_BOUND;
68 * Get list element containing socket s. Called by sw_send* "syscalls".
71 struct sock_list *list_elem_from_socket(int s)
73 struct sock_list *ptr;
75 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
83 * Get list element containing address addr. Called by sw_bind "syscall".
86 struct sock_list *list_elem_from_address(__CONST_SOCKADDR_ARG addr)
88 struct sock_list *ptr;
90 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next) {
91 dprintf("socket address to be checked\n");
92 if (ptr->bind_state == STATE_NOTBOUND)
94 dprintf("bound socket address to be checked\n");
95 if (memcmp(&ptr->addr, addr, sizeof(addr)) == 0)
103 * Unlink socket from list. Called by list_remove_socket.
105 static struct sock_list *list_unlink_socket(int s)
107 struct sock_list *ptr;
109 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
111 ptr->next->prev = ptr->prev;
112 ptr->prev->next = ptr->next;
122 * Remove socket from list. Called by sw_close "syscall".
125 int list_remove_socket(int s)
127 struct sock_list *ptr;
129 ptr = list_unlink_socket(s);
138 * Check if a socket is bound.
140 int list_socket_is_bound(int s)
142 struct sock_list *ptr;
144 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
146 if (ptr->bind_state == STATE_BOUND)