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1.1 root 1: .NH
2: Other X Server Functions
3: .XS
4: Other X Server Functions
5: .XE
6: .NH 2
7: Access Control
8: .PP
9: .IN "Access Control"
10: .IN "Internet Addresses"
11: .IN "DECnet Addresses"
12: .IN "Authentication"
13: X does not provide any protection on a per-window basis.
14: If you find out the resource id of a resource, you can manipulate it.
15: To provide some minimal level of protection, however,
16: connections are only permitted from machines you trust.
17: This is adequate on single user workstations, but obviously
18: breaks down on timesharing machines.
19: In the long run, it is expected that X will use a real network
20: authentication server, so we have only minimal facilities for the
21: time being.
22: Both DECnet and TCP domains are possible to use.
23: .PP
24: .IN "Default Protection"
25: On a VAX, the initial set of hosts allowed to open connections consists
26: .IN "File" "/etc/X?.hosts"
27: of:
28: .sp
29: \(bu the host the window system is running on
30: \(bu each host listed in \fI/etc/X?.hosts\fP, where `?' is the number of the
31: display.
32: .sp
33: This file should consist of host names separated by newlines.
34: DECnet nodes must terminate in ``::'' to distinguish them from internet hosts.
35: .FD
36: .IN "Definitions" "XAddHost"
37: .IN "XAddHost"
38: .IN "File" "<sys/socket.h>"
39: #include <sys/socket.h>
40: XAddHost (host)
41: struct in_addr *host; /* network address */
42: .FN
43: Add the specified host to the list of hosts allowed to open connections
44: to this display.
45: The display hardware must be on the same host as the program issuing the
46: command.
47: .FD
48: .IN "Definitions" "XAddNode"
49: .IN "XAddNode"
50: .IN "File" "<netdnet/dn.h>"
51: #include <netdnet/dn.h>
52: XAddNode (node)
53: struct dn_naddr *node; /* network address */
54: .FN
55: Add the specified DECnet node to the list of nodes allowed to open connections
56: to this display.
57: The display hardware must be on the same host as the program issuing the
58: command.
59: .FD
60: .IN "Definitions" "XRemoveHost"
61: .IN "XRemoveHost"
62: .IN "File" "<sys/socket.h>"
63: #include <sys/socket.h>
64: XRemoveHost (host)
65: struct in_addr *host; /* network address */
66: .FN
67: Remove the specified host from the list of hosts allowed to open
68: connections to the display.
69: The display hardware must be on the same host as the
70: client process.
71: If you remove your machine from the access list, no new connections
72: can be made.
73: There is no way back from this call short of logout!
74: .FD
75: .IN "Definitions" "XRemoveNode"
76: .IN "XRemoveNode"
77: .IN "File" "<netdnet/dn.h>"
78: #include <netdnet/dn.h>
79: XRemoveNode (node)
80: struct dn_naddr *node; /* network address */
81: .FN
82: Remove the specified DECnet node from the list of nodes allowed to open
83: connections to the display.
84: The display hardware must be on the same node as the
85: client process.
86: If you remove your machine from the access list, no new connections
87: can be made.
88: There is no way back from this call short of logout!
89: .FD
90: .IN "Definitions" "XGetHosts"
91: .IN "XGetHosts"
92: .IN "File" "<sys/socket.h>"
93: #include <sys/socket.h>
94: struct in_addr *XGetHosts (nhosts)
95: int *nhosts; /* RETURN */
96: .FN
97: Returns the current list of hosts allowed to open connections.
98: This allows a program to find out what machines can make connections.
99: Space is allocated and function returns a pointer to an array of hosts in the list.
100: The number of hosts are returned in the \fInhosts\fP argument.
101: This memory should be freed when no longer in use.
102: .FD
103: .IN "Definitions" "XGetNodes"
104: .IN "XGetNodes"
105: .IN "File" "<netdnet/dn.h>"
106: #include <netdnet/dn.h>
107: struct dn_naddr *XGetNodes (nnodes)
108: int *nnodes; /* RETURN */
109: .FN
110: Returns the current list of DECnet nodes allowed to open connections.
111: This allows a program to find out what machines can make connections.
112: Space is allocated and function returns a pointer to an array of hosts in the list.
113: The number of nodes are returned in the \fInodes\fP argument.
114: This memory should be freed when no longer in use.
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