1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
*
* Various SNAC-related dodads...
*
* outstanding_snacs is a list of aim_snac_t structs. A SNAC should be added
* whenever a new SNAC is sent and it should remain in the list until the
* response for it has been receieved.
*
* cleansnacs() should be called periodically by the client in order
* to facilitate the aging out of unreplied-to SNACs. This can and does
* happen, so it should be handled.
*
*/
#include <aim.h>
/*
* Called from aim_session_init() to initialize the hash.
*/
void aim_initsnachash(aim_session_t *sess)
{
int i;
for (i = 0; i < AIM_SNAC_HASH_SIZE; i++)
sess->snac_hash[i] = NULL;
return;
}
aim_snacid_t aim_cachesnac(aim_session_t *sess, const guint16 family, const guint16 type, const guint16 flags, const void *data, const int datalen)
{
aim_snac_t snac;
snac.id = sess->snacid_next++;
snac.family = family;
snac.type = type;
snac.flags = flags;
if (datalen) {
if (!(snac.data = g_malloc(datalen)))
return 0; /* er... */
memcpy(snac.data, data, datalen);
} else
snac.data = NULL;
return aim_newsnac(sess, &snac);
}
/*
* Clones the passed snac structure and caches it in the
* list/hash.
*/
aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac)
{
aim_snac_t *snac;
int index;
if (!newsnac)
return 0;
if (!(snac = g_malloc(sizeof(aim_snac_t))))
return 0;
memcpy(snac, newsnac, sizeof(aim_snac_t));
snac->issuetime = time(NULL);
index = snac->id % AIM_SNAC_HASH_SIZE;
snac->next = (aim_snac_t *)sess->snac_hash[index];
sess->snac_hash[index] = (void *)snac;
return snac->id;
}
/*
* Finds a snac structure with the passed SNAC ID,
* removes it from the list/hash, and returns a pointer to it.
*
* The returned structure must be freed by the caller.
*
*/
aim_snac_t *aim_remsnac(aim_session_t *sess, aim_snacid_t id)
{
aim_snac_t *cur, **prev;
int index;
index = id % AIM_SNAC_HASH_SIZE;
for (prev = (aim_snac_t **)&sess->snac_hash[index]; (cur = *prev); ) {
if (cur->id == id) {
*prev = cur->next;
return cur;
} else
prev = &cur->next;
}
return cur;
}
/*
* This is for cleaning up old SNACs that either don't get replies or
* a reply was never received for. Garabage collection. Plain and simple.
*
* maxage is the _minimum_ age in seconds to keep SNACs.
*
*/
void aim_cleansnacs(aim_session_t *sess, int maxage)
{
int i;
for (i = 0; i < AIM_SNAC_HASH_SIZE; i++) {
aim_snac_t *cur, **prev;
time_t curtime;
if (!sess->snac_hash[i])
continue;
curtime = time(NULL); /* done here in case we waited for the lock */
for (prev = (aim_snac_t **)&sess->snac_hash[i]; (cur = *prev); ) {
if ((curtime - cur->issuetime) > maxage) {
*prev = cur->next;
/* XXX should we have destructors here? */
g_free(cur->data);
g_free(cur);
} else
prev = &cur->next;
}
}
return;
}
int aim_putsnac(aim_bstream_t *bs, guint16 family, guint16 subtype, guint16 flags, aim_snacid_t snacid)
{
aimbs_put16(bs, family);
aimbs_put16(bs, subtype);
aimbs_put16(bs, flags);
aimbs_put32(bs, snacid);
return 10;
}
|
