Mercurial > dovecot > core-2.2

annotate src/pop3/client.c @ 1056:a9b499b2611e HEAD

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Disconnect after too many bad commands. We also crashed if there were no mails in mailbox.
author Timo Sirainen <tss@iki.fi>
date Thu, 30 Jan 2003 20:05:33 +0200
parents 28f606ada24a
children d805c2f1d6a9
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1 /* Copyright (C) 2002 Timo Sirainen */
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2
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3 #include "common.h"
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4 #include "ioloop.h"
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5 #include "network.h"
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6 #include "istream.h"
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7 #include "ostream.h"
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8 #include "mail-storage.h"
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9 #include "commands.h"
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10
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11 #include <stdlib.h>
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12
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13 /* max. length of input command line (spec says 512) */
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14 #define MAX_INBUF_SIZE 2048
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15
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16 /* If we can't send a buffer in a minute, disconnect the client */
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17 #define CLIENT_OUTPUT_TIMEOUT (60*1000)
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18
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19 /* Disconnect client when it sends too many bad commands in a row */
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20 #define CLIENT_MAX_BAD_COMMANDS 20
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21
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22 /* Disconnect client after idling this many seconds */
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23 #define CLIENT_IDLE_TIMEOUT (60*30)
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24
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25 extern struct mail_storage_callbacks mail_storage_callbacks;
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26
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27 static struct client *my_client; /* we don't need more than one currently */
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28 static struct timeout *to_idle;
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29
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30 static void client_input(void *context);
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31
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32 static void client_output_timeout(void *context)
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33 {
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34 struct client *client = context;
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35
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36 i_stream_close(client->input);
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37 o_stream_close(client->output);
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38 }
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39
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40 static int init_mailbox(struct client *client)
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41 {
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42 struct mail_fetch_context *ctx;
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43 struct mail *mail;
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44 struct mailbox_status status;
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45 const char *messageset;
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46 int i, all_found, failed;
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47
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48 if (!client->mailbox->get_status(client->mailbox,
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49 STATUS_MESSAGES | STATUS_UIDVALIDITY,
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50 &status)) {
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51 client_send_storage_error(client);
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52 return FALSE;
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53 }
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54
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55 client->messages_count = status.messages;
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56 client->uidvalidity = status.uidvalidity;
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57
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58 if (client->messages_count == 0)
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59 return TRUE;
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60
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61 client->message_sizes = i_new(uoff_t, client->messages_count);
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62 messageset = t_strdup_printf("1:%u", client->messages_count);
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63 for (i = 0; i < 2; i++) {
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64 ctx = client->mailbox->fetch_init(client->mailbox,
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65 MAIL_FETCH_SIZE,
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66 NULL, messageset, FALSE);
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67 if (ctx == NULL) {
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68 client_send_storage_error(client);
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69 return FALSE;
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70 }
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71
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72 client->total_size = 0;
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73 failed = FALSE;
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74 while ((mail = client->mailbox->fetch_next(ctx)) != NULL) {
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75 uoff_t size = mail->get_size(mail);
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76
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77 if (size == (uoff_t)-1) {
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78 failed = TRUE;
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79 break;
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80 }
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81 client->total_size += size;
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82
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83 i_assert(mail->seq <= client->messages_count);
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84 client->message_sizes[mail->seq-1] = size;
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85 }
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86
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87 if (!client->mailbox->fetch_deinit(ctx, &all_found)) {
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88 client_send_storage_error(client);
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89 return FALSE;
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90 }
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91
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92 if (!failed && all_found)
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93 return TRUE;
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94
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95 /* well, sync and try again */
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96 if (!client->mailbox->sync(client->mailbox, TRUE)) {
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97 client_send_storage_error(client);
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98 return FALSE;
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99 }
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100 }
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101
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102 client_send_line(client, "-ERR Couldn't sync mailbox.");
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103 return FALSE;
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104 }
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105
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106 struct client *client_create(int hin, int hout, struct mailbox *mailbox)
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107 {
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108 struct client *client;
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109
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110 client = i_new(struct client, 1);
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111 client->input = i_stream_create_file(hin, default_pool,
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112 MAX_INBUF_SIZE, FALSE);
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113 client->output = o_stream_create_file(hout, default_pool, 4096,
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114 IO_PRIORITY_DEFAULT, FALSE);
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115
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116 /* set timeout for sending data */
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117 o_stream_set_blocking(client->output, CLIENT_OUTPUT_TIMEOUT,
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118 client_output_timeout, client);
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119
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120 client->io = io_add(hin, IO_READ, client_input, client);
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121 client->last_input = ioloop_time;
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122
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123 client->storage = mailbox->storage;
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124 client->mailbox = mailbox;
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125
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126 mailbox->storage->set_callbacks(mailbox->storage,
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127 &mail_storage_callbacks, client);
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128
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129 i_assert(my_client == NULL);
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130 my_client = client;
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131
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132 if (!init_mailbox(client)) {
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133 client_destroy(client);
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134 client = NULL;
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135 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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136
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diff changeset
137 return client;
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138 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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diff changeset
139
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diff changeset
140 void client_destroy(struct client *client)
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parents:
diff changeset
141 {
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diff changeset
142 o_stream_flush(client->output);
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Timo Sirainen <tss@iki.fi>
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diff changeset
143
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144 if (client->mailbox != NULL)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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145 client->mailbox->close(client->mailbox);
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diff changeset
146 mail_storage_destroy(client->storage);
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diff changeset
147
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diff changeset
148 i_free(client->message_sizes);
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149 i_free(client->deleted_bitmask);
1043
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150
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diff changeset
151 io_remove(client->io);
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diff changeset
152
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153 i_stream_unref(client->input);
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154 o_stream_unref(client->output);
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155
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diff changeset
156 i_free(client);
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diff changeset
157
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158 /* quit the program */
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159 my_client = NULL;
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Timo Sirainen <tss@iki.fi>
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diff changeset
160 io_loop_stop(ioloop);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
161 }
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diff changeset
162
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diff changeset
163 void client_disconnect(struct client *client)
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parents:
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164 {
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165 o_stream_flush(client->output);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
166
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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167 i_stream_close(client->input);
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168 o_stream_close(client->output);
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Timo Sirainen <tss@iki.fi>
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169 }
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170
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171 void client_send_line(struct client *client, const char *fmt, ...)
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Timo Sirainen <tss@iki.fi>
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172 {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
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173 va_list va;
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Timo Sirainen <tss@iki.fi>
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174
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
175 if (client->output->closed)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
176 return;
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
177
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Timo Sirainen <tss@iki.fi>
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diff changeset
178 va_start(va, fmt);
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Timo Sirainen <tss@iki.fi>
parents:
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179 (void)o_stream_send_str(client->output, t_strdup_vprintf(fmt, va));
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180 (void)o_stream_send(client->output, "\r\n", 2);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
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181 va_end(va);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
182 }
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183
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diff changeset
184 void client_send_storage_error(struct client *client)
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
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diff changeset
185 {
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
Timo Sirainen <tss@iki.fi>
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diff changeset
186 const char *error;
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
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diff changeset
187
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
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diff changeset
188 error = client->storage->get_last_error(client->storage, NULL);
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
Timo Sirainen <tss@iki.fi>
parents: 1043
diff changeset
189 client_send_line(client, "-ERR %s", error);
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
Timo Sirainen <tss@iki.fi>
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diff changeset
190 }
50d258907c99 Read the sizes of all messages to memory at startup. More failsafe and
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diff changeset
191
1043
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diff changeset
192 static void client_input(void *context)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
193 {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
194 struct client *client = context;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
195 char *line, *args;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
196
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parents:
diff changeset
197 client->last_input = ioloop_time;
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parents:
diff changeset
198
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
199 switch (i_stream_read(client->input)) {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
200 case -1:
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
201 /* disconnected */
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
202 client_destroy(client);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
203 return;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
204 case -2:
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
205 /* line too long, kill it */
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
206 client_send_line(client, "-ERR Input line too long.");
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
207 client_destroy(client);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
208 return;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
209 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
210
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
211 o_stream_cork(client->output);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
212 while (!client->output->closed &&
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
213 (line = i_stream_next_line(client->input)) != NULL) {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
214 args = strchr(line, ' ');
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
215 if (args == NULL)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
216 args = "";
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
217 else
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
218 *args++ = '\0';
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
219
1056
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
220 if (client_command_execute(client, line, args))
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
221 client->bad_counter = 0;
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
222 else if (++client->bad_counter > CLIENT_MAX_BAD_COMMANDS) {
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
223 client_send_line(client, "-ERR Too many bad commands.");
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
224 client_disconnect(client);
a9b499b2611e Disconnect after too many bad commands. We also crashed if there were no
Timo Sirainen <tss@iki.fi>
parents: 1053
diff changeset
225 }
1043
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parents:
diff changeset
226 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
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parents:
diff changeset
227 o_stream_flush(client->output);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
228
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
229 if (client->output->closed)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
230 client_destroy(client);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
231 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
232
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
233 static void idle_timeout(void *context __attr_unused__)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
234 {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
235 if (my_client == NULL)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
236 return;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
237
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
238 if (ioloop_time - my_client->last_input >= CLIENT_IDLE_TIMEOUT) {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
239 client_send_line(my_client,
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
240 "-ERR Disconnected for inactivity.");
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
241 client_destroy(my_client);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
242 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
243 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
244
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
245 void clients_init(void)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
246 {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
247 my_client = NULL;
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
248 to_idle = timeout_add(10000, idle_timeout, NULL);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
249 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
250
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
251 void clients_deinit(void)
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
252 {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
253 if (my_client != NULL) {
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
254 client_send_line(my_client, "-ERR Server shutting down.");
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
255 client_destroy(my_client);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
256 }
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
257
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
258 timeout_remove(to_idle);
cacabd33c68a Initial code for POP3 server. RETR isn't working right yet, there's some
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
259 }