336
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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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>
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10 #include <ngx_mail.h>
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11 #include <ngx_mail_imap_module.h>
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12
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13
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14 static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf);
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15 static char *ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent,
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16 void *child);
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17
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18
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19 static ngx_str_t ngx_mail_imap_default_capabilities[] = {
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20 ngx_string("IMAP4"),
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21 ngx_string("IMAP4rev1"),
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22 ngx_string("UIDPLUS"),
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23 ngx_null_string
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24 };
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25
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26
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27 static ngx_conf_bitmask_t ngx_mail_imap_auth_methods[] = {
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28 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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29 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
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30 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
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31 { ngx_null_string, 0 }
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32 };
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33
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34
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35 static ngx_str_t ngx_mail_imap_auth_methods_names[] = {
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36 ngx_string("AUTH=PLAIN"),
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37 ngx_string("AUTH=LOGIN"),
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38 ngx_null_string, /* APOP */
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39 ngx_string("AUTH=CRAM-MD5"),
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40 ngx_null_string /* NONE */
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336
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41 };
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42
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43
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44 static ngx_mail_protocol_t ngx_mail_imap_protocol = {
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45 ngx_string("imap"),
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46 { 143, 993, 0, 0 },
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47 NGX_MAIL_IMAP_PROTOCOL,
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48
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49 ngx_mail_imap_init_session,
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50 ngx_mail_imap_init_protocol,
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51 ngx_mail_imap_parse_command,
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52 ngx_mail_imap_auth_state,
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53
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54 ngx_string("* BAD internal server error" CRLF)
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55 };
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56
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57
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58 static ngx_command_t ngx_mail_imap_commands[] = {
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59
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60 { ngx_string("imap_client_buffer"),
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61 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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62 ngx_conf_set_size_slot,
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63 NGX_MAIL_SRV_CONF_OFFSET,
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64 offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size),
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65 NULL },
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66
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67 { ngx_string("imap_capabilities"),
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68 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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69 ngx_mail_capabilities,
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70 NGX_MAIL_SRV_CONF_OFFSET,
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71 offsetof(ngx_mail_imap_srv_conf_t, capabilities),
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72 NULL },
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73
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74 { ngx_string("imap_auth"),
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75 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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76 ngx_conf_set_bitmask_slot,
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77 NGX_MAIL_SRV_CONF_OFFSET,
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78 offsetof(ngx_mail_imap_srv_conf_t, auth_methods),
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79 &ngx_mail_imap_auth_methods },
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80
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81 ngx_null_command
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82 };
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83
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84
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85 static ngx_mail_module_t ngx_mail_imap_module_ctx = {
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86 &ngx_mail_imap_protocol, /* protocol */
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87
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88 NULL, /* create main configuration */
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89 NULL, /* init main configuration */
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90
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91 ngx_mail_imap_create_srv_conf, /* create server configuration */
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92 ngx_mail_imap_merge_srv_conf /* merge server configuration */
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93 };
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94
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95
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96 ngx_module_t ngx_mail_imap_module = {
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97 NGX_MODULE_V1,
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98 &ngx_mail_imap_module_ctx, /* module context */
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99 ngx_mail_imap_commands, /* module directives */
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100 NGX_MAIL_MODULE, /* module type */
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101 NULL, /* init master */
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102 NULL, /* init module */
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103 NULL, /* init process */
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104 NULL, /* init thread */
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105 NULL, /* exit thread */
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106 NULL, /* exit process */
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107 NULL, /* exit master */
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108 NGX_MODULE_V1_PADDING
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109 };
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110
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111
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112 static void *
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113 ngx_mail_imap_create_srv_conf(ngx_conf_t *cf)
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114 {
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115 ngx_mail_imap_srv_conf_t *iscf;
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116
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117 iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t));
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118 if (iscf == NULL) {
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119 return NULL;
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120 }
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121
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122 iscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
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123
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124 if (ngx_array_init(&iscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
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125 != NGX_OK)
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126 {
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127 return NULL;
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128 }
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129
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130 return iscf;
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131 }
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132
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133
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134 static char *
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135 ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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136 {
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137 ngx_mail_imap_srv_conf_t *prev = parent;
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138 ngx_mail_imap_srv_conf_t *conf = child;
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139
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140 u_char *p, *auth;
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141 size_t size;
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142 ngx_str_t *c, *d;
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143 ngx_uint_t i, m;
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144
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145 ngx_conf_merge_size_value(conf->client_buffer_size,
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146 prev->client_buffer_size,
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147 (size_t) ngx_pagesize);
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148
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149 ngx_conf_merge_bitmask_value(conf->auth_methods,
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150 prev->auth_methods,
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151 (NGX_CONF_BITMASK_SET
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152 |NGX_MAIL_AUTH_PLAIN_ENABLED));
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153
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154
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155 if (conf->capabilities.nelts == 0) {
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156 conf->capabilities = prev->capabilities;
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157 }
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158
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159 if (conf->capabilities.nelts == 0) {
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160
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161 for (d = ngx_mail_imap_default_capabilities; d->len; d++) {
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162 c = ngx_array_push(&conf->capabilities);
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163 if (c == NULL) {
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164 return NGX_CONF_ERROR;
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165 }
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166
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167 *c = *d;
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168 }
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169 }
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170
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171 size = sizeof("* CAPABILITY" CRLF) - 1;
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172
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173 c = conf->capabilities.elts;
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174 for (i = 0; i < conf->capabilities.nelts; i++) {
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175 size += 1 + c[i].len;
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176 }
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177
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178 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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179 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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180 m <<= 1, i++)
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181 {
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182 if (m & conf->auth_methods) {
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183 size += 1 + ngx_mail_imap_auth_methods_names[i].len;
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184 }
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185 }
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186
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187 p = ngx_pnalloc(cf->pool, size);
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188 if (p == NULL) {
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189 return NGX_CONF_ERROR;
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190 }
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191
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192 conf->capability.len = size;
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193 conf->capability.data = p;
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194
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195 p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 1);
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196
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197 for (i = 0; i < conf->capabilities.nelts; i++) {
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198 *p++ = ' ';
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199 p = ngx_cpymem(p, c[i].data, c[i].len);
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200 }
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201
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202 auth = p;
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203
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204 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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205 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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206 m <<= 1, i++)
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207 {
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208 if (m & conf->auth_methods) {
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209 *p++ = ' ';
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210 p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data,
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211 ngx_mail_imap_auth_methods_names[i].len);
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212 }
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213 }
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214
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215 *p++ = CR; *p = LF;
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216
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217
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218 size += sizeof(" STARTTLS") - 1;
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219
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220 p = ngx_pnalloc(cf->pool, size);
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221 if (p == NULL) {
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 conf->starttls_capability.len = size;
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226 conf->starttls_capability.data = p;
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227
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228 p = ngx_cpymem(p, conf->capability.data,
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229 conf->capability.len - (sizeof(CRLF) - 1));
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230 p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1);
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231 *p++ = CR; *p = LF;
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232
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233
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234 size = (auth - conf->capability.data) + sizeof(CRLF) - 1
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235 + sizeof(" STARTTLS LOGINDISABLED") - 1;
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236
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237 p = ngx_pnalloc(cf->pool, size);
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238 if (p == NULL) {
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239 return NGX_CONF_ERROR;
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240 }
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241
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242 conf->starttls_only_capability.len = size;
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243 conf->starttls_only_capability.data = p;
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244
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245 p = ngx_cpymem(p, conf->capability.data,
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246 auth - conf->capability.data);
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247 p = ngx_cpymem(p, " STARTTLS LOGINDISABLED",
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248 sizeof(" STARTTLS LOGINDISABLED") - 1);
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249 *p++ = CR; *p = LF;
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250
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251 return NGX_CONF_OK;
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252 }
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