Mercurial > dovecot > core-2.2
annotate src/lmtp/lmtp-proxy.c @ 10415:3662241f75f2 HEAD
lmtp proxy fixes.
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 07 Dec 2009 13:34:35 -0500 |
parents | ad3fb3f929fc |
children | abe02cf3bd47 |
rev | line source |
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9832
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1 /* Copyright (c) 2009 Dovecot authors, see the included COPYING file */ |
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2 |
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3 #include "lib.h" |
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4 #include "array.h" |
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5 #include "ioloop.h" |
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6 #include "istream.h" |
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7 #include "istream-tee.h" |
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8 #include "ostream.h" |
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9 #include "lmtp-client.h" |
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10 #include "lmtp-proxy.h" |
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11 |
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12 #define LMTP_MAX_LINE_LEN 1024 |
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13 #define LMTP_PROXY_DATA_INPUT_TIMEOUT_MSECS (1000*60) |
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14 |
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15 struct lmtp_proxy_recipient { |
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16 struct lmtp_proxy_connection *conn; |
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17 const char *address; |
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18 const char *reply; |
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19 |
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20 unsigned int rcpt_to_failed:1; |
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21 unsigned int data_reply_received:1; |
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22 }; |
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23 |
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24 struct lmtp_proxy_connection { |
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25 struct lmtp_proxy *proxy; |
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26 struct lmtp_proxy_settings set; |
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27 |
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28 struct lmtp_client *client; |
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29 struct istream *data_input; |
10415 | 30 |
31 unsigned int finished:1; | |
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32 unsigned int failed:1; |
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33 }; |
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34 |
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35 struct lmtp_proxy { |
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36 pool_t pool; |
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37 const char *mail_from, *my_hostname; |
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38 ARRAY_DEFINE(connections, struct lmtp_proxy_connection *); |
10415 | 39 ARRAY_DEFINE(rcpt_to, struct lmtp_proxy_recipient *); |
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40 unsigned int next_data_reply_idx; |
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41 |
10415 | 42 struct timeout *to, *to_data_idle, *to_finish; |
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43 struct io *io; |
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44 struct istream *data_input, *orig_data_input; |
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45 struct ostream *client_output; |
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46 struct tee_istream *tee_data_input; |
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48 unsigned int max_timeout_msecs; |
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49 |
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50 lmtp_proxy_finish_callback_t *finish_callback; |
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51 void *finish_context; |
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52 |
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53 unsigned int finished:1; |
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54 unsigned int input_timeout:1; |
10415 | 55 unsigned int handling_data_input:1; |
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56 }; |
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57 |
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58 static void lmtp_conn_finish(void *context); |
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59 static void lmtp_proxy_data_input(struct lmtp_proxy *proxy); |
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60 |
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61 struct lmtp_proxy * |
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62 lmtp_proxy_init(const char *my_hostname, struct ostream *client_output) |
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63 { |
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64 struct lmtp_proxy *proxy; |
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65 pool_t pool; |
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66 |
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67 o_stream_ref(client_output); |
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68 |
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69 pool = pool_alloconly_create("lmtp proxy", 1024); |
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70 proxy = p_new(pool, struct lmtp_proxy, 1); |
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71 proxy->pool = pool; |
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72 proxy->my_hostname = p_strdup(pool, my_hostname); |
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73 proxy->client_output = client_output; |
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74 i_array_init(&proxy->rcpt_to, 32); |
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75 i_array_init(&proxy->connections, 32); |
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76 return proxy; |
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77 } |
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78 |
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79 static void lmtp_proxy_connections_deinit(struct lmtp_proxy *proxy) |
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80 { |
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81 struct lmtp_proxy_connection *const *conns; |
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82 |
10406 | 83 array_foreach(&proxy->connections, conns) { |
84 struct lmtp_proxy_connection *conn = *conns; | |
85 | |
86 lmtp_client_deinit(&conn->client); | |
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87 } |
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88 } |
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89 |
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90 void lmtp_proxy_deinit(struct lmtp_proxy **_proxy) |
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91 { |
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92 struct lmtp_proxy *proxy = *_proxy; |
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93 |
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94 *_proxy = NULL; |
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95 |
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96 lmtp_proxy_connections_deinit(proxy); |
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97 if (proxy->data_input != NULL) |
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98 i_stream_unref(&proxy->data_input); |
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99 if (proxy->client_output != NULL) |
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100 o_stream_unref(&proxy->client_output); |
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101 if (proxy->to_data_idle != NULL) |
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102 timeout_remove(&proxy->to_data_idle); |
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103 if (proxy->to != NULL) |
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104 timeout_remove(&proxy->to); |
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105 if (proxy->io != NULL) |
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106 io_remove(&proxy->io); |
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107 array_free(&proxy->rcpt_to); |
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108 array_free(&proxy->connections); |
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109 pool_unref(&proxy->pool); |
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110 } |
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111 |
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112 void lmtp_proxy_mail_from(struct lmtp_proxy *proxy, const char *value) |
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113 { |
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114 proxy->mail_from = p_strdup(proxy->pool, value); |
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115 } |
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116 |
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117 static struct lmtp_proxy_connection * |
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118 lmtp_proxy_get_connection(struct lmtp_proxy *proxy, |
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119 const struct lmtp_proxy_settings *set) |
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120 { |
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121 struct lmtp_proxy_connection *const *conns, *conn; |
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122 |
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123 i_assert(set->timeout_msecs > 0); |
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124 |
10406 | 125 array_foreach(&proxy->connections, conns) { |
126 conn = *conns; | |
127 | |
128 if (conn->set.port == set->port && | |
129 strcmp(conn->set.host, set->host) == 0) | |
130 return conn; | |
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131 } |
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132 |
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133 conn = p_new(proxy->pool, struct lmtp_proxy_connection, 1); |
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134 conn->proxy = proxy; |
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135 conn->set.host = p_strdup(proxy->pool, set->host); |
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136 conn->set.port = set->port; |
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137 conn->set.timeout_msecs = set->timeout_msecs; |
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138 array_append(&proxy->connections, &conn, 1); |
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139 conn->client = lmtp_client_init(proxy->mail_from, proxy->my_hostname, |
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140 lmtp_conn_finish, conn); |
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141 if (lmtp_client_connect_tcp(conn->client, set->protocol, |
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142 conn->set.host, conn->set.port) < 0) |
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143 conn->failed = TRUE; |
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144 |
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145 if (proxy->max_timeout_msecs < set->timeout_msecs) |
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146 proxy->max_timeout_msecs = set->timeout_msecs; |
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147 return conn; |
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148 } |
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149 |
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150 static bool lmtp_proxy_send_data_replies(struct lmtp_proxy *proxy) |
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151 { |
10415 | 152 struct lmtp_proxy_recipient *const *rcpt; |
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153 unsigned int i, count; |
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154 |
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155 o_stream_cork(proxy->client_output); |
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156 rcpt = array_get(&proxy->rcpt_to, &count); |
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157 for (i = proxy->next_data_reply_idx; i < count; i++) { |
10415 | 158 if (!(rcpt[i]->rcpt_to_failed || rcpt[i]->data_reply_received)) |
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159 break; |
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160 o_stream_send_str(proxy->client_output, |
10415 | 161 t_strconcat(rcpt[i]->reply, "\r\n", NULL)); |
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162 } |
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163 o_stream_uncork(proxy->client_output); |
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164 proxy->next_data_reply_idx = i; |
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165 |
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166 return i == count; |
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167 } |
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168 |
10415 | 169 static void lmtp_proxy_finish_timeout(struct lmtp_proxy *proxy) |
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170 { |
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171 i_assert(!proxy->finished); |
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172 |
10415 | 173 timeout_remove(&proxy->to_finish); |
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174 proxy->finished = TRUE; |
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175 proxy->finish_callback(proxy->input_timeout, proxy->finish_context); |
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176 } |
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177 |
10415 | 178 static void lmtp_proxy_finish(struct lmtp_proxy *proxy) |
179 { | |
180 /* do the actual finishing in a timeout handler, since the finish | |
181 callback causes the proxy to be destroyed and the code leading up | |
182 to this function can be called from many different places. it's | |
183 easier this way rather than having all the callers check if the | |
184 proxy was already destroyed. */ | |
185 if (proxy->to_finish == NULL) { | |
186 proxy->to_finish = timeout_add(0, lmtp_proxy_finish_timeout, | |
187 proxy); | |
188 } | |
189 } | |
190 | |
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191 static void lmtp_proxy_try_finish(struct lmtp_proxy *proxy) |
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192 { |
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193 if (lmtp_proxy_send_data_replies(proxy) && |
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194 (proxy->data_input->eof || proxy->data_input->stream_errno != 0 || |
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195 proxy->input_timeout)) |
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196 lmtp_proxy_finish(proxy); |
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197 } |
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198 |
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199 static void lmtp_conn_finish(void *context) |
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200 { |
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201 struct lmtp_proxy_connection *conn = context; |
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202 |
10415 | 203 conn->finished = TRUE; |
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204 if (conn->data_input != NULL) |
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205 i_stream_unref(&conn->data_input); |
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206 lmtp_proxy_try_finish(conn->proxy); |
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207 } |
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208 |
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209 static void lmtp_proxy_fail_all(struct lmtp_proxy *proxy, const char *reason) |
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210 { |
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211 struct lmtp_proxy_connection *const *conns; |
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212 unsigned int i, count; |
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213 const char *line; |
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214 |
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215 conns = array_get(&proxy->connections, &count); |
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216 for (i = 0; i < count; i++) { |
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217 line = t_strdup_printf(ERRSTR_TEMP_REMOTE_FAILURE |
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218 " (%s while waiting for reply to %s)", reason, |
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219 lmtp_client_state_to_string(conns[i]->client)); |
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220 lmtp_client_fail(conns[i]->client, line); |
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221 } |
10415 | 222 |
223 if (proxy->to_finish == NULL) { | |
224 /* we still have some DATA input to read */ | |
225 if (proxy->io == NULL) { | |
226 proxy->io = io_add(i_stream_get_fd(proxy->data_input), | |
227 IO_READ, | |
228 lmtp_proxy_data_input, proxy); | |
229 } | |
230 } | |
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231 } |
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232 |
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233 static void lmtp_proxy_data_input_timeout(struct lmtp_proxy *proxy) |
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234 { |
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235 struct lmtp_proxy_connection *const *conns; |
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236 unsigned int i, count; |
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237 |
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238 proxy->input_timeout = TRUE; |
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239 i_stream_close(proxy->orig_data_input); |
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240 |
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241 conns = array_get(&proxy->connections, &count); |
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242 for (i = 0; i < count; i++) { |
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243 lmtp_client_fail(conns[i]->client, ERRSTR_TEMP_REMOTE_FAILURE |
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244 " (timeout in DATA input)"); |
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245 } |
10415 | 246 if (proxy->to_finish == NULL) { |
247 /* we had earlier failed all clients already and were just | |
248 waiting for DATA input to finish, but DATA input also failed | |
249 with a timeout. */ | |
250 lmtp_proxy_finish(proxy); | |
251 } | |
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252 } |
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253 |
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254 static void |
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255 lmtp_proxy_conn_rcpt_to(bool success, const char *reply, void *context) |
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256 { |
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257 struct lmtp_proxy_recipient *rcpt = context; |
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258 struct lmtp_proxy_connection *conn = rcpt->conn; |
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259 |
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260 i_assert(rcpt->reply == NULL); |
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261 |
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262 rcpt->reply = p_strdup(conn->proxy->pool, reply); |
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263 rcpt->rcpt_to_failed = !success; |
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264 } |
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265 |
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266 static void |
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267 lmtp_proxy_conn_data(bool success ATTR_UNUSED, const char *reply, void *context) |
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268 { |
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269 struct lmtp_proxy_recipient *rcpt = context; |
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270 struct lmtp_proxy_connection *conn = rcpt->conn; |
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271 |
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272 i_assert(!rcpt->rcpt_to_failed); |
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273 i_assert(rcpt->reply != NULL); |
10396 | 274 |
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275 rcpt->reply = p_strdup(conn->proxy->pool, reply); |
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276 rcpt->data_reply_received = TRUE; |
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277 } |
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278 |
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279 int lmtp_proxy_add_rcpt(struct lmtp_proxy *proxy, const char *address, |
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280 const struct lmtp_proxy_settings *set) |
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281 { |
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282 struct lmtp_proxy_connection *conn; |
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283 struct lmtp_proxy_recipient *rcpt; |
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284 |
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285 conn = lmtp_proxy_get_connection(proxy, set); |
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286 if (conn->failed) |
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287 return -1; |
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288 |
10415 | 289 rcpt = p_new(proxy->pool, struct lmtp_proxy_recipient, 1); |
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290 rcpt->conn = conn; |
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291 rcpt->address = p_strdup(proxy->pool, address); |
10415 | 292 array_append(&proxy->rcpt_to, &rcpt, 1); |
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293 |
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294 lmtp_client_add_rcpt(conn->client, address, lmtp_proxy_conn_rcpt_to, |
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295 lmtp_proxy_conn_data, rcpt); |
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296 return 0; |
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297 } |
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298 |
10415 | 299 static size_t lmtp_proxy_find_lowest_offset(struct lmtp_proxy *proxy) |
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300 { |
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301 struct lmtp_proxy_connection *const *conns; |
10415 | 302 uoff_t min_offset = (uoff_t)-1; |
303 | |
304 array_foreach(&proxy->connections, conns) { | |
305 struct lmtp_proxy_connection *conn = *conns; | |
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306 |
10415 | 307 if (conn->data_input != NULL && |
308 min_offset > conn->data_input->v_offset) | |
309 min_offset = conn->data_input->v_offset; | |
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310 } |
10415 | 311 return min_offset; |
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312 } |
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313 |
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314 static bool lmtp_proxy_disconnect_hanging_output(struct lmtp_proxy *proxy) |
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315 { |
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316 struct lmtp_proxy_connection *const *conns; |
10415 | 317 uoff_t min_offset; |
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318 |
10415 | 319 min_offset = lmtp_proxy_find_lowest_offset(proxy); |
320 if (min_offset == (uoff_t)-1) | |
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321 return FALSE; |
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322 |
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323 /* disconnect all connections that are keeping us from reading |
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324 more input. */ |
10415 | 325 array_foreach(&proxy->connections, conns) { |
326 struct lmtp_proxy_connection *conn = *conns; | |
327 | |
328 if (conn->data_input != NULL && | |
329 conn->data_input->v_offset == min_offset) { | |
330 lmtp_client_fail(conn->client, | |
10396 | 331 ERRSTR_TEMP_REMOTE_FAILURE |
332 " (DATA output timeout)"); | |
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333 } |
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334 } |
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335 return TRUE; |
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336 } |
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337 |
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338 static void lmtp_proxy_output_timeout(struct lmtp_proxy *proxy) |
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339 { |
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340 timeout_remove(&proxy->to); |
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341 |
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342 /* drop the connection with the most unread data */ |
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343 if (lmtp_proxy_disconnect_hanging_output(proxy)) |
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344 lmtp_proxy_data_input(proxy); |
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345 else { |
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346 /* no such connection, so we've already sent everything but |
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347 some servers aren't replying to us. disconnect all of |
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348 them. */ |
10415 | 349 i_assert(proxy->data_input->eof); |
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350 lmtp_proxy_fail_all(proxy, "timeout"); |
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351 } |
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352 } |
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353 |
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354 static void lmtp_proxy_wait_for_output(struct lmtp_proxy *proxy) |
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355 { |
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356 if (proxy->io != NULL) |
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357 io_remove(&proxy->io); |
10415 | 358 if (proxy->to == NULL) { |
359 proxy->to = timeout_add(proxy->max_timeout_msecs, | |
360 lmtp_proxy_output_timeout, proxy); | |
361 } | |
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362 } |
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363 |
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364 static bool lmtp_proxy_data_read(struct lmtp_proxy *proxy) |
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365 { |
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366 size_t size; |
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367 |
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368 timeout_reset(proxy->to_data_idle); |
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369 |
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370 switch (i_stream_read(proxy->data_input)) { |
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371 case 0: |
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372 if (!tee_i_stream_child_is_waiting(proxy->data_input)) { |
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373 /* nothing new read */ |
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374 if (proxy->io != NULL) |
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375 return FALSE; |
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376 proxy->io = io_add(i_stream_get_fd(proxy->data_input), |
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377 IO_READ, |
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378 lmtp_proxy_data_input, proxy); |
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379 return FALSE; |
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380 } |
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381 /* fall through */ |
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382 case -2: |
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383 /* buffer full. someone's stalling. */ |
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384 lmtp_proxy_wait_for_output(proxy); |
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385 return FALSE; |
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386 case -1: |
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387 if (proxy->data_input->stream_errno != 0) |
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388 lmtp_proxy_fail_all(proxy, "disconnect"); |
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389 else { |
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390 /* finished reading data input. now we'll just have to |
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391 wait for replies. */ |
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392 lmtp_proxy_wait_for_output(proxy); |
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393 /* if all RCPT TOs failed, we can finish now */ |
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394 lmtp_proxy_try_finish(proxy); |
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lmtp client, proxy: Several bugfixes.
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395 } |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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396 return FALSE; |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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397 default: |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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398 /* something was read */ |
10415 | 399 if (proxy->to != NULL) |
400 timeout_remove(&proxy->to); | |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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401 (void)i_stream_get_data(proxy->data_input, &size); |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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402 i_stream_skip(proxy->data_input, size); |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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403 return TRUE; |
3a16bec9c961
lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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404 } |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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405 } |
3a16bec9c961
lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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406 |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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407 static void lmtp_proxy_data_input(struct lmtp_proxy *proxy) |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
Timo Sirainen <tss@iki.fi>
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408 { |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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409 struct lmtp_proxy_connection *const *conns; |
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410 |
10415 | 411 i_assert(!proxy->handling_data_input); |
412 | |
413 proxy->handling_data_input = TRUE; | |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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414 do { |
10415 | 415 array_foreach(&proxy->connections, conns) |
10406 | 416 lmtp_client_send_more((*conns)->client); |
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lmtp client, proxy: Several bugfixes.
Timo Sirainen <tss@iki.fi>
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417 } while (lmtp_proxy_data_read(proxy)); |
10415 | 418 proxy->handling_data_input = FALSE; |
419 } | |
420 | |
421 static void lmtp_proxy_more_data_sent(void *context) | |
422 { | |
423 struct lmtp_proxy *proxy = context; | |
424 | |
425 if (proxy->to != NULL && !proxy->handling_data_input) { | |
426 /* some tee child is blocking others. it might have been this | |
427 one, so see if we can continue. */ | |
428 lmtp_proxy_data_input(proxy); | |
429 } | |
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430 } |
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431 |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
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432 void lmtp_proxy_start(struct lmtp_proxy *proxy, struct istream *data_input, |
10288
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lmtp proxy: Add Received: header.
Timo Sirainen <tss@iki.fi>
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433 const char *header, |
10400
96152031f5d9
lmtp proxy: More error handling fixes.
Timo Sirainen <tss@iki.fi>
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434 lmtp_proxy_finish_callback_t *callback, void *context) |
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435 { |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
Timo Sirainen <tss@iki.fi>
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436 struct lmtp_proxy_connection *const *conns; |
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437 |
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Timo Sirainen <tss@iki.fi>
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438 proxy->finish_callback = callback; |
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439 proxy->finish_context = context; |
10400
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lmtp proxy: More error handling fixes.
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440 proxy->orig_data_input = data_input; |
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441 proxy->tee_data_input = tee_i_stream_create(data_input); |
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442 proxy->data_input = tee_i_stream_create_child(proxy->tee_data_input); |
10284
2ad1ad1e1083
lmtp proxy: Added data input timeout.
Timo Sirainen <tss@iki.fi>
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10278
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443 proxy->to_data_idle = timeout_add(LMTP_PROXY_DATA_INPUT_TIMEOUT_MSECS, |
2ad1ad1e1083
lmtp proxy: Added data input timeout.
Timo Sirainen <tss@iki.fi>
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444 lmtp_proxy_data_input_timeout, proxy); |
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lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
Timo Sirainen <tss@iki.fi>
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445 |
10406 | 446 array_foreach(&proxy->connections, conns) { |
447 struct lmtp_proxy_connection *conn = *conns; | |
448 | |
10415 | 449 if (conn->finished) { |
450 /* this connection had already failed */ | |
451 continue; | |
452 } | |
453 | |
454 lmtp_client_set_data_output_callback(conn->client, | |
455 lmtp_proxy_more_data_sent, | |
456 proxy); | |
457 | |
10406 | 458 conn->data_input = |
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Timo Sirainen <tss@iki.fi>
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459 tee_i_stream_create_child(proxy->tee_data_input); |
10406 | 460 lmtp_client_set_data_header(conn->client, header); |
461 lmtp_client_send(conn->client, conn->data_input); | |
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462 } |
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463 |
3a16bec9c961
lmtp: Added initial support for proxying mails to other LMTP/SMTP servers.
Timo Sirainen <tss@iki.fi>
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464 lmtp_proxy_data_input(proxy); |
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465 } |