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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/* Copyright (c) 2011-2013 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "ioloop.h"
#include "llist.h"
#include "global-memory.h"
#include "stats-settings.h"
#include "mail-stats.h"
#include "mail-session.h"
#include "mail-command.h"
#define MAIL_COMMAND_TIMEOUT_SECS (60*15)
/* commands are sorted by their last_update timestamp, oldest first */
struct mail_command *stable_mail_commands_head;
struct mail_command *stable_mail_commands_tail;
static size_t mail_command_memsize(const struct mail_command *cmd)
{
return sizeof(*cmd) + strlen(cmd->name) + 1 + strlen(cmd->args) + 1;
}
static struct mail_command *
mail_command_find(struct mail_session *session, unsigned int id)
{
struct mail_command *cmd;
i_assert(id != 0);
if (id > session->highest_cmd_id) {
/* fast path for new commands */
return NULL;
}
for (cmd = session->commands; cmd != NULL; cmd = cmd->session_next) {
if (cmd->id == id)
return cmd;
}
/* expired */
return NULL;
}
static struct mail_command *
mail_command_add(struct mail_session *session, const char *name,
const char *args)
{
struct mail_command *cmd;
cmd = i_new(struct mail_command, 1);
cmd->refcount = 1; /* unrefed at "done" */
cmd->session = session;
cmd->name = i_strdup(name);
cmd->args = i_strdup(args);
cmd->last_update = ioloop_timeval;
DLLIST2_APPEND_FULL(&stable_mail_commands_head,
&stable_mail_commands_tail, cmd,
stable_prev, stable_next);
DLLIST_PREPEND_FULL(&session->commands, cmd,
session_prev, session_next);
mail_session_ref(cmd->session);
global_memory_alloc(mail_command_memsize(cmd));
return cmd;
}
static void mail_command_free(struct mail_command *cmd)
{
i_assert(cmd->refcount == 0);
global_memory_free(mail_command_memsize(cmd));
DLLIST2_REMOVE_FULL(&stable_mail_commands_head,
&stable_mail_commands_tail, cmd,
stable_prev, stable_next);
DLLIST_REMOVE_FULL(&cmd->session->commands, cmd,
session_prev, session_next);
mail_session_unref(&cmd->session);
i_free(cmd->name);
i_free(cmd->args);
i_free(cmd);
}
void mail_command_ref(struct mail_command *cmd)
{
cmd->refcount++;
}
void mail_command_unref(struct mail_command **_cmd)
{
struct mail_command *cmd = *_cmd;
i_assert(cmd->refcount > 0);
cmd->refcount--;
*_cmd = NULL;
}
int mail_command_update_parse(const char *const *args, const char **error_r)
{
struct mail_session *session;
struct mail_command *cmd;
struct mail_stats stats, diff_stats;
const char *error;
unsigned int i, cmd_id;
bool done = FALSE, continued = FALSE;
/* <session guid> <cmd id> [d] <name> <args> [key=value ..]
<session guid> <cmd id> c[d] [key=value ..] */
if (str_array_length(args) < 3) {
*error_r = "UPDATE-CMD: Too few parameters";
return -1;
}
if (mail_session_get(args[0], &session, error_r) < 0)
return -1;
if (str_to_uint(args[1], &cmd_id) < 0 || cmd_id == 0) {
*error_r = "UPDATE-CMD: Invalid command id";
return -1;
}
for (i = 0; args[2][i] != '\0'; i++) {
switch (args[2][i]) {
case 'd':
done = TRUE;
break;
case 'c':
continued = TRUE;
break;
default:
*error_r = "UPDATE-CMD: Invalid flags parameter";
return -1;
}
}
cmd = mail_command_find(session, cmd_id);
if (!continued) {
/* new command */
if (cmd != NULL) {
*error_r = "UPDATE-CMD: Duplicate new command id";
return -1;
}
if (str_array_length(args) < 5) {
*error_r = "UPDATE-CMD: Too few parameters";
return -1;
}
cmd = mail_command_add(session, args[3], args[4]);
cmd->id = cmd_id;
session->highest_cmd_id =
I_MAX(session->highest_cmd_id, cmd_id);
session->num_cmds++;
session->user->num_cmds++;
session->user->domain->num_cmds++;
if (session->ip != NULL)
session->ip->num_cmds++;
args += 5;
} else {
if (cmd == NULL) {
/* already expired command, ignore */
i_warning("UPDATE-CMD: Already expired");
return 0;
}
args += 3;
cmd->last_update = ioloop_timeval;
}
if (mail_stats_parse(args, &stats, error_r) < 0) {
*error_r = t_strconcat("UPDATE-CMD: ", *error_r, NULL);
return -1;
}
if (!mail_stats_diff(&cmd->stats, &stats, &diff_stats, &error)) {
*error_r = t_strconcat("UPDATE-CMD: stats shrank: ",
error, NULL);
return -1;
}
mail_stats_add(&cmd->stats, &diff_stats);
if (done) {
cmd->id = 0;
mail_command_unref(&cmd);
}
mail_session_refresh(session, NULL);
return 0;
}
static bool mail_command_is_timed_out(struct mail_command *cmd)
{
/* some commands like IDLE can run forever */
return ioloop_time - cmd->last_update.tv_sec >
MAIL_COMMAND_TIMEOUT_SECS;
}
void mail_commands_free_memory(void)
{
unsigned int diff;
while (stable_mail_commands_head != NULL) {
struct mail_command *cmd = stable_mail_commands_head;
if (cmd->refcount == 0)
i_assert(cmd->id == 0);
else if (cmd->refcount == 1 &&
(cmd->session->disconnected ||
mail_command_is_timed_out(cmd))) {
/* session was probably lost */
mail_command_unref(&cmd);
} else {
break;
}
mail_command_free(stable_mail_commands_head);
if (global_used_memory < stats_settings->memory_limit ||
stable_mail_commands_head == NULL)
break;
diff = ioloop_time - stable_mail_commands_head->last_update.tv_sec;
if (diff < stats_settings->command_min_time)
break;
}
}
void mail_commands_init(void)
{
}
void mail_commands_deinit(void)
{
while (stable_mail_commands_head != NULL) {
struct mail_command *cmd = stable_mail_commands_head;
if (cmd->id != 0)
mail_command_unref(&cmd);
mail_command_free(stable_mail_commands_head);
}
}
|