Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_handler.c @ 1481:b58ce1cf66da
smtp_client_buffer and smtp_greeting_delay
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 Sep 2007 13:58:49 +0000 |
parents | a231e37a19ab |
children | 4606dce4f416 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
1136 | 10 #include <ngx_mail.h> |
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12 |
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13 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev); |
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14 |
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15 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c); |
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16 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
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17 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c); |
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18 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s, |
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19 ngx_connection_t *c); |
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20 |
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21 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s, |
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22 ngx_connection_t *c, char *err); |
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23 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, |
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24 ngx_connection_t *c, char *err); |
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25 |
527 | 26 |
1136 | 27 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF; |
28 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF; | |
29 static u_char smtp_next[] = "334 " CRLF; | |
30 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF; | |
31 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF; | |
32 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF; | |
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33 static u_char smtp_invalid_pipelining[] = |
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34 "503 5.5.0 Improper use of SMTP command pipelining" CRLF; |
1136 | 35 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF; |
36 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF; | |
37 | |
521 | 38 |
39 void | |
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40 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
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41 { |
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42 ngx_msec_t timeout; |
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43 ngx_mail_core_srv_conf_t *cscf; |
641 | 44 |
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45 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
541 | 46 |
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47 if (cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) { |
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48 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
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49 ngx_mail_session_internal_server_error(s); |
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50 return; |
641 | 51 } |
52 } | |
53 | |
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54 if (s->buffer == NULL) { |
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55 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) |
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56 == NGX_ERROR) |
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57 { |
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58 ngx_mail_session_internal_server_error(s); |
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59 return; |
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60 } |
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61 |
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62 s->buffer = ngx_create_temp_buf(c->pool, cscf->smtp_client_buffer_size); |
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63 if (s->buffer == NULL) { |
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64 ngx_mail_session_internal_server_error(s); |
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65 return; |
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66 } |
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67 } |
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68 |
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69 timeout = cscf->smtp_greeting_delay ? cscf->smtp_greeting_delay: |
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70 cscf->timeout; |
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71 ngx_add_timer(c->read, timeout); |
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72 |
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73 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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74 ngx_mail_close_connection(c); |
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75 } |
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76 |
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77 if (cscf->smtp_greeting_delay) { |
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78 c->read->handler = ngx_mail_smtp_invalid_pipelining; |
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79 return; |
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80 } |
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81 |
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82 c->read->handler = ngx_mail_smtp_init_protocol; |
583 | 83 |
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84 s->out = cscf->smtp_greeting; |
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85 |
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86 ngx_mail_send(c->write); |
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87 } |
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88 |
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89 |
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90 static void |
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91 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev) |
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92 { |
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93 ngx_connection_t *c; |
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94 ngx_mail_session_t *s; |
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95 ngx_mail_core_srv_conf_t *cscf; |
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96 |
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97 c = rev->data; |
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98 s = c->data; |
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99 |
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100 c->log->action = "in delay pipelining state"; |
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101 |
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102 if (rev->timedout) { |
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103 |
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104 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting"); |
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105 |
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106 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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107 |
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108 c->read->handler = ngx_mail_smtp_init_protocol; |
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109 |
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110 ngx_add_timer(c->read, cscf->timeout); |
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111 |
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112 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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113 ngx_mail_close_connection(c); |
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114 return; |
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115 } |
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116 |
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117 s->out = cscf->smtp_greeting; |
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118 |
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119 } else { |
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120 |
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121 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining"); |
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122 |
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123 if (ngx_mail_smtp_discard_command(s, c, |
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124 "client was rejected before greeting: \"%V\"") |
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125 != NGX_OK) |
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126 { |
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127 return; |
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128 } |
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129 |
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130 s->out.len = sizeof(smtp_invalid_pipelining) - 1; |
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131 s->out.data = smtp_invalid_pipelining; |
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132 } |
539 | 133 |
1136 | 134 ngx_mail_send(c->write); |
539 | 135 } |
136 | |
137 | |
138 void | |
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139 ngx_mail_smtp_init_protocol(ngx_event_t *rev) |
539 | 140 { |
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141 ngx_connection_t *c; |
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142 ngx_mail_session_t *s; |
417
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143 |
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144 c = rev->data; |
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145 |
541 | 146 c->log->action = "in auth state"; |
147 | |
423
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148 if (rev->timedout) { |
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149 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 150 c->timedout = 1; |
1136 | 151 ngx_mail_close_connection(c); |
423
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152 return; |
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153 } |
420
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154 |
539 | 155 s = c->data; |
521 | 156 |
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157 s->mail_state = ngx_smtp_start; |
1477 | 158 c->read->handler = ngx_mail_smtp_auth_state; |
1136 | 159 |
1477 | 160 ngx_mail_smtp_auth_state(rev); |
521 | 161 } |
162 | |
163 | |
527 | 164 void |
1477 | 165 ngx_mail_smtp_auth_state(ngx_event_t *rev) |
420
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166 { |
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167 ngx_int_t rc; |
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168 ngx_connection_t *c; |
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169 ngx_mail_session_t *s; |
420
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170 |
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171 c = rev->data; |
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172 s = c->data; |
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173 |
1136 | 174 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state"); |
421
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175 |
423
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176 if (rev->timedout) { |
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177 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 178 c->timedout = 1; |
1136 | 179 ngx_mail_close_connection(c); |
423
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180 return; |
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181 } |
420
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182 |
539 | 183 if (s->out.len) { |
1136 | 184 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy"); |
539 | 185 s->blocked = 1; |
186 return; | |
187 } | |
188 | |
189 s->blocked = 0; | |
190 | |
1136 | 191 rc = ngx_mail_read_command(s); |
420
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192 |
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193 if (rc == NGX_AGAIN || rc == NGX_ERROR) { |
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194 return; |
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195 } |
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196 |
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197 s->out.len = sizeof(smtp_ok) - 1; |
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198 s->out.data = smtp_ok; |
421
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199 |
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200 if (rc == NGX_OK) { |
1136 | 201 switch (s->mail_state) { |
421
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202 |
1136 | 203 case ngx_smtp_start: |
421
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204 |
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205 switch (s->command) { |
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206 |
1136 | 207 case NGX_SMTP_HELO: |
208 case NGX_SMTP_EHLO: | |
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209 rc = ngx_mail_smtp_helo(s, c); |
809 | 210 break; |
211 | |
1136 | 212 case NGX_SMTP_AUTH: |
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213 rc = ngx_mail_smtp_auth(s, c); |
800 | 214 break; |
215 | |
1136 | 216 case NGX_SMTP_QUIT: |
539 | 217 s->quit = 1; |
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218 s->out.len = sizeof(smtp_bye) - 1; |
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219 s->out.data = smtp_bye; |
527 | 220 break; |
221 | |
1136 | 222 case NGX_SMTP_MAIL: |
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223 rc = ngx_mail_smtp_mail(s, c); |
583 | 224 break; |
225 | |
1136 | 226 case NGX_SMTP_NOOP: |
227 case NGX_SMTP_RSET: | |
421
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228 break; |
1322 | 229 |
230 case NGX_SMTP_STARTTLS: | |
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231 rc = ngx_mail_smtp_starttls(s, c); |
1322 | 232 break; |
233 | |
234 default: | |
235 rc = NGX_MAIL_PARSE_INVALID_COMMAND; | |
236 break; | |
421
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237 } |
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238 |
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239 break; |
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240 |
1136 | 241 case ngx_smtp_auth_login_username: |
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242 rc = ngx_mail_auth_login_username(s, c); |
809 | 243 |
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244 s->out.len = sizeof(smtp_password) - 1; |
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245 s->out.data = smtp_password; |
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246 s->mail_state = ngx_smtp_auth_login_password; |
809 | 247 break; |
248 | |
1136 | 249 case ngx_smtp_auth_login_password: |
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250 rc = ngx_mail_auth_login_password(s, c); |
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251 break; |
809 | 252 |
1136 | 253 case ngx_smtp_auth_plain: |
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254 rc = ngx_mail_auth_plain(s, c, 0); |
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255 break; |
809 | 256 |
1136 | 257 case ngx_smtp_auth_cram_md5: |
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258 rc = ngx_mail_auth_cram_md5(s, c); |
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259 break; |
421
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260 } |
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261 } |
420
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262 |
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263 switch (rc) { |
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264 |
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265 case NGX_DONE: |
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266 ngx_mail_auth(s); |
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267 return; |
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268 |
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269 case NGX_ERROR: |
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270 ngx_mail_session_internal_server_error(s); |
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271 return; |
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272 |
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273 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 274 s->mail_state = ngx_smtp_start; |
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275 s->state = 0; |
420
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276 |
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277 s->out.len = sizeof(smtp_invalid_command) - 1; |
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278 s->out.data = smtp_invalid_command; |
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279 |
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280 /* fall through */ |
539 | 281 |
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282 case NGX_OK: |
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283 s->args.nelts = 0; |
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284 s->buffer->pos = s->buffer->start; |
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285 s->buffer->last = s->buffer->start; |
810 | 286 |
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287 if (s->state) { |
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288 s->arg_start = s->buffer->start; |
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289 } |
539 | 290 |
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291 ngx_mail_send(c->write); |
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292 } |
417
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293 } |
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294 |
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295 |
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296 static ngx_int_t |
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297 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c) |
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298 { |
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299 ngx_str_t *arg; |
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300 ngx_mail_core_srv_conf_t *cscf; |
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301 #if (NGX_MAIL_SSL) |
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302 ngx_mail_ssl_conf_t *sslcf; |
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303 #endif |
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304 |
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305 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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306 |
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307 if (s->args.nelts != 1) { |
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308 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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309 s->out.data = smtp_invalid_argument; |
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310 s->state = 0; |
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311 return NGX_OK; |
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312 } |
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313 |
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314 arg = s->args.elts; |
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315 |
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316 s->smtp_helo.len = arg[0].len; |
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317 |
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318 s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len); |
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319 if (s->smtp_helo.data == NULL) { |
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320 return NGX_ERROR; |
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321 } |
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322 |
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323 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len); |
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324 |
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325 if (s->command == NGX_SMTP_HELO) { |
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326 s->out = cscf->smtp_server_name; |
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327 |
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328 } else { |
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329 s->esmtp = 1; |
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330 |
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331 #if (NGX_MAIL_SSL) |
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332 |
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333 if (c->ssl == NULL) { |
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334 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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335 |
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336 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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337 s->out = cscf->smtp_starttls_capability; |
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338 return NGX_OK; |
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339 } |
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340 |
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341 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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342 s->out = cscf->smtp_starttls_only_capability; |
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343 return NGX_OK; |
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344 } |
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345 } |
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346 #endif |
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347 |
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348 s->out = cscf->smtp_capability; |
420
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349 } |
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350 |
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351 return NGX_OK; |
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352 } |
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353 |
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354 |
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355 static ngx_int_t |
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356 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
525 | 357 { |
1479 | 358 ngx_int_t rc; |
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359 ngx_mail_core_srv_conf_t *cscf; |
525 | 360 |
1479 | 361 #if (NGX_MAIL_SSL) |
362 if (ngx_mail_starttls_only(s, c)) { | |
363 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 364 } |
365 #endif | |
366 | |
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367 if (s->args.nelts == 0) { |
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368 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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369 s->out.data = smtp_invalid_argument; |
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370 s->state = 0; |
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371 return NGX_OK; |
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372 } |
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373 |
1479 | 374 rc = ngx_mail_auth_parse(s, c); |
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375 |
1479 | 376 switch (rc) { |
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377 |
1479 | 378 case NGX_MAIL_AUTH_LOGIN: |
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379 |
1479 | 380 s->out.len = sizeof(smtp_username) - 1; |
381 s->out.data = smtp_username; | |
382 s->mail_state = ngx_smtp_auth_login_username; | |
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383 |
1479 | 384 return NGX_OK; |
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385 |
1479 | 386 case NGX_MAIL_AUTH_PLAIN: |
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387 |
1479 | 388 s->out.len = sizeof(smtp_next) - 1; |
389 s->out.data = smtp_next; | |
390 s->mail_state = ngx_smtp_auth_plain; | |
543 | 391 |
1479 | 392 return NGX_OK; |
393 | |
394 case NGX_MAIL_AUTH_CRAM_MD5: | |
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395 |
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396 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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397 |
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398 if (!(cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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399 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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400 } |
479 | 401 |
1479 | 402 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) { |
403 s->mail_state = ngx_smtp_auth_cram_md5; | |
404 return NGX_OK; | |
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405 } |
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406 |
1479 | 407 return NGX_ERROR; |
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408 } |
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409 |
1479 | 410 return rc; |
417
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411 } |
539 | 412 |
413 | |
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414 static ngx_int_t |
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415 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 416 { |
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417 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\""); |
577 | 418 |
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419 s->out.len = sizeof(smtp_auth_required) - 1; |
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420 s->out.data = smtp_auth_required; |
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421 |
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422 return NGX_OK; |
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423 } |
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424 |
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425 |
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426 static ngx_int_t |
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427 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c) |
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428 { |
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429 #if (NGX_MAIL_SSL) |
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430 ngx_mail_ssl_conf_t *sslcf; |
541 | 431 |
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432 if (c->ssl == NULL) { |
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433 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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434 if (sslcf->starttls) { |
541 | 435 |
1476
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436 /* |
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437 * RFC3207 requires us to discard any knowledge |
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438 * obtained from client before STARTTLS. |
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439 */ |
541 | 440 |
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441 s->smtp_helo.len = 0; |
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442 s->smtp_helo.data = NULL; |
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443 |
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444 c->read->handler = ngx_mail_starttls_handler; |
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445 return NGX_OK; |
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446 } |
541 | 447 } |
448 | |
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449 #endif |
541 | 450 |
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451 return NGX_MAIL_PARSE_INVALID_COMMAND; |
541 | 452 } |
1481
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453 |
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454 |
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455 static ngx_int_t |
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456 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c, |
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457 char *err) |
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458 { |
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459 ssize_t n; |
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460 |
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461 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last); |
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462 |
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463 if (n == NGX_ERROR || n == 0) { |
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464 ngx_mail_close_connection(c); |
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465 return NGX_ERROR; |
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466 } |
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467 |
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468 if (n > 0) { |
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469 s->buffer->last += n; |
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470 } |
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471 |
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472 if (n == NGX_AGAIN) { |
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473 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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474 ngx_mail_session_internal_server_error(s); |
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475 return NGX_ERROR; |
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476 } |
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477 |
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478 return NGX_AGAIN; |
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479 } |
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480 |
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481 ngx_mail_smtp_log_rejected_command(s, c, err); |
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482 |
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483 s->buffer->pos = s->buffer->start; |
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484 s->buffer->last = s->buffer->start; |
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485 |
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486 return NGX_OK; |
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487 } |
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488 |
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489 |
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490 static void |
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491 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c, |
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492 char *err) |
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493 { |
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494 u_char ch; |
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495 ngx_str_t cmd; |
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496 ngx_uint_t i; |
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497 |
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498 if (c->log->log_level < NGX_LOG_INFO) { |
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499 return; |
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500 } |
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501 |
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502 cmd.len = s->buffer->last - s->buffer->start; |
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503 cmd.data = s->buffer->start; |
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504 |
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505 for (i = 0; i < cmd.len; i++) { |
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506 ch = cmd.data[i]; |
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507 |
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508 if (ch != CR && ch != LF) { |
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509 continue; |
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510 } |
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|
511 |
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512 cmd.data[i] = ' '; |
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513 } |
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514 |
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515 while (i) { |
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516 if (cmd.data[i - 1] != ' ') { |
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517 break; |
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|
518 } |
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|
519 |
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520 i--; |
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|
521 } |
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|
522 |
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523 cmd.len = i; |
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524 |
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525 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd); |
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526 } |