6695
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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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_stream.h>
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10
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11
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12 typedef struct {
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13 ngx_flag_t enabled;
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14 } ngx_stream_ssl_preread_srv_conf_t;
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15
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16
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17 typedef struct {
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18 size_t left;
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19 size_t size;
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20 u_char *pos;
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21 u_char *dst;
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22 u_char buf[4];
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23 ngx_str_t host;
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24 ngx_log_t *log;
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25 ngx_pool_t *pool;
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26 ngx_uint_t state;
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27 } ngx_stream_ssl_preread_ctx_t;
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28
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29
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30 static ngx_int_t ngx_stream_ssl_preread_handler(ngx_stream_session_t *s);
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31 static ngx_int_t ngx_stream_ssl_preread_parse_record(
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32 ngx_stream_ssl_preread_ctx_t *ctx, u_char *pos, u_char *last);
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33 static ngx_int_t ngx_stream_ssl_preread_server_name_variable(
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34 ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
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35 static ngx_int_t ngx_stream_ssl_preread_add_variables(ngx_conf_t *cf);
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36 static void *ngx_stream_ssl_preread_create_srv_conf(ngx_conf_t *cf);
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37 static char *ngx_stream_ssl_preread_merge_srv_conf(ngx_conf_t *cf, void *parent,
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38 void *child);
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39 static ngx_int_t ngx_stream_ssl_preread_init(ngx_conf_t *cf);
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40
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41
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42 static ngx_command_t ngx_stream_ssl_preread_commands[] = {
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43
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44 { ngx_string("ssl_preread"),
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45 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
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46 ngx_conf_set_flag_slot,
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47 NGX_STREAM_SRV_CONF_OFFSET,
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48 offsetof(ngx_stream_ssl_preread_srv_conf_t, enabled),
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49 NULL },
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50
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51 ngx_null_command
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52 };
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53
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54
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55 static ngx_stream_module_t ngx_stream_ssl_preread_module_ctx = {
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56 ngx_stream_ssl_preread_add_variables, /* preconfiguration */
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57 ngx_stream_ssl_preread_init, /* postconfiguration */
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58
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59 NULL, /* create main configuration */
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60 NULL, /* init main configuration */
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61
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62 ngx_stream_ssl_preread_create_srv_conf, /* create server configuration */
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63 ngx_stream_ssl_preread_merge_srv_conf /* merge server configuration */
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64 };
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65
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66
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67 ngx_module_t ngx_stream_ssl_preread_module = {
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68 NGX_MODULE_V1,
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69 &ngx_stream_ssl_preread_module_ctx, /* module context */
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70 ngx_stream_ssl_preread_commands, /* module directives */
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71 NGX_STREAM_MODULE, /* module type */
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72 NULL, /* init master */
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73 NULL, /* init module */
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74 NULL, /* init process */
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75 NULL, /* init thread */
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76 NULL, /* exit thread */
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77 NULL, /* exit process */
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78 NULL, /* exit master */
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79 NGX_MODULE_V1_PADDING
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80 };
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81
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82
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83 static ngx_stream_variable_t ngx_stream_ssl_preread_vars[] = {
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84
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85 { ngx_string("ssl_preread_server_name"), NULL,
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86 ngx_stream_ssl_preread_server_name_variable, 0, 0, 0 },
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87
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88 { ngx_null_string, NULL, NULL, 0, 0, 0 }
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89 };
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90
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91
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92 static ngx_int_t
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93 ngx_stream_ssl_preread_handler(ngx_stream_session_t *s)
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94 {
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95 u_char *last, *p;
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96 size_t len;
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97 ngx_int_t rc;
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98 ngx_connection_t *c;
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99 ngx_stream_ssl_preread_ctx_t *ctx;
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100 ngx_stream_ssl_preread_srv_conf_t *sscf;
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101
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102 c = s->connection;
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103
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104 ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0, "ssl preread handler");
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105
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106 sscf = ngx_stream_get_module_srv_conf(s, ngx_stream_ssl_preread_module);
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107
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108 if (!sscf->enabled) {
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109 return NGX_DECLINED;
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110 }
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111
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112 if (c->type != SOCK_STREAM) {
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113 return NGX_DECLINED;
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114 }
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115
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116 if (c->buffer == NULL) {
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117 return NGX_AGAIN;
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118 }
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119
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120 ctx = ngx_stream_get_module_ctx(s, ngx_stream_ssl_preread_module);
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121 if (ctx == NULL) {
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122 ctx = ngx_pcalloc(c->pool, sizeof(ngx_stream_ssl_preread_ctx_t));
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123 if (ctx == NULL) {
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124 return NGX_ERROR;
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125 }
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126
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127 ngx_stream_set_ctx(s, ctx, ngx_stream_ssl_preread_module);
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128
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129 ctx->pool = c->pool;
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130 ctx->log = c->log;
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131 ctx->pos = c->buffer->pos;
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132 }
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133
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134 p = ctx->pos;
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135 last = c->buffer->last;
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136
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137 while (last - p >= 5) {
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138
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139 if (p[0] != 0x16) {
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140 ngx_log_debug(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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141 "ssl preread: not a handshake");
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142 return NGX_DECLINED;
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143 }
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144
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145 if (p[1] != 3 || p[2] == 0) {
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146 ngx_log_debug(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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147 "ssl preread: unsupported SSL version");
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148 return NGX_DECLINED;
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149 }
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150
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151 len = (p[3] << 8) + p[4];
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152
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153 /* read the whole record before parsing */
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154 if ((size_t) (last - p) < len + 5) {
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155 break;
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156 }
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157
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158 p += 5;
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159
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160 rc = ngx_stream_ssl_preread_parse_record(ctx, p, p + len);
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161 if (rc != NGX_AGAIN) {
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162 return rc;
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163 }
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164
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165 p += len;
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166 }
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167
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168 ctx->pos = p;
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169
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170 return NGX_AGAIN;
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171 }
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172
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173
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174 static ngx_int_t
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175 ngx_stream_ssl_preread_parse_record(ngx_stream_ssl_preread_ctx_t *ctx,
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176 u_char *pos, u_char *last)
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177 {
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178 size_t left, n, size;
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179 u_char *dst, *p;
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180
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181 enum {
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182 sw_start = 0,
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183 sw_header, /* handshake msg_type, length */
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184 sw_head_tail, /* version, random */
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185 sw_sid_len, /* session_id length */
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186 sw_sid, /* session_id */
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187 sw_cs_len, /* cipher_suites length */
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188 sw_cs, /* cipher_suites */
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189 sw_cm_len, /* compression_methods length */
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190 sw_cm, /* compression_methods */
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191 sw_ext, /* extension */
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192 sw_ext_header, /* extension_type, extension_data length */
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193 sw_sni_len, /* SNI length */
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194 sw_sni_host_head, /* SNI name_type, host_name length */
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195 sw_sni_host /* SNI host_name */
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196 } state;
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197
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198 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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199 "ssl preread: state %ui left %z", ctx->state, ctx->left);
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200
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201 state = ctx->state;
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202 size = ctx->size;
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203 left = ctx->left;
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204 dst = ctx->dst;
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205 p = ctx->buf;
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206
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207 for ( ;; ) {
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208 n = ngx_min((size_t) (last - pos), size);
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209
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210 if (dst) {
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211 dst = ngx_cpymem(dst, pos, n);
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212 }
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213
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214 pos += n;
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215 size -= n;
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216 left -= n;
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217
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218 if (size != 0) {
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219 break;
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220 }
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221
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222 switch (state) {
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223
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224 case sw_start:
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225 state = sw_header;
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226 dst = p;
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227 size = 4;
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228 left = size;
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229 break;
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230
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231 case sw_header:
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232 if (p[0] != 1) {
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233 ngx_log_debug(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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234 "ssl preread: not a client hello");
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235 return NGX_DECLINED;
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236 }
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237
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238 state = sw_head_tail;
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239 dst = NULL;
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240 size = 34;
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241 left = (p[1] << 16) + (p[2] << 8) + p[3];
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242 break;
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243
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244 case sw_head_tail:
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245 state = sw_sid_len;
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246 dst = p;
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247 size = 1;
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248 break;
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249
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250 case sw_sid_len:
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251 state = sw_sid;
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252 dst = NULL;
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253 size = p[0];
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254 break;
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255
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256 case sw_sid:
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257 state = sw_cs_len;
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258 dst = p;
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259 size = 2;
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260 break;
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261
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262 case sw_cs_len:
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263 state = sw_cs;
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264 dst = NULL;
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265 size = (p[0] << 8) + p[1];
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266 break;
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267
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268 case sw_cs:
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269 state = sw_cm_len;
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270 dst = p;
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271 size = 1;
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272 break;
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273
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274 case sw_cm_len:
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275 state = sw_cm;
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276 dst = NULL;
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277 size = p[0];
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278 break;
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279
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280 case sw_cm:
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281 if (left == 0) {
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282 /* no extensions */
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283 return NGX_OK;
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284 }
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285
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286 state = sw_ext;
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287 dst = p;
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288 size = 2;
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289 break;
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290
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291 case sw_ext:
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292 if (left == 0) {
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293 return NGX_OK;
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294 }
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295
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296 state = sw_ext_header;
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297 dst = p;
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298 size = 4;
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299 break;
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300
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301 case sw_ext_header:
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302 if (p[0] == 0 && p[1] == 0) {
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303 /* SNI extension */
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304 state = sw_sni_len;
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305 dst = NULL;
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306 size = 2;
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307 break;
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308 }
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309
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310 state = sw_ext;
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311 dst = NULL;
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312 size = (p[2] << 8) + p[3];
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313 break;
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314
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315 case sw_sni_len:
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316 state = sw_sni_host_head;
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317 dst = p;
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318 size = 3;
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319 break;
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320
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321 case sw_sni_host_head:
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322 if (p[0] != 0) {
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323 ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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324 "ssl preread: SNI hostname type is not DNS");
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325 return NGX_DECLINED;
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326 }
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327
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328 state = sw_sni_host;
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329 size = (p[1] << 8) + p[2];
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330
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331 ctx->host.data = ngx_pnalloc(ctx->pool, size);
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332 if (ctx->host.data == NULL) {
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333 return NGX_ERROR;
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334 }
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335
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336 ctx->host.len = size;
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337 dst = ctx->host.data;
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338 break;
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339
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340 case sw_sni_host:
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341 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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342 "ssl preread: SNI hostname \"%V\"", &ctx->host);
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343 return NGX_OK;
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344 }
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345
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346 if (left < size) {
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347 ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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348 "ssl preread: failed to parse handshake");
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349 return NGX_DECLINED;
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350 }
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351 }
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352
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353 ctx->state = state;
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354 ctx->size = size;
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355 ctx->left = left;
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356 ctx->dst = dst;
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357
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358 return NGX_AGAIN;
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359 }
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360
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361
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362 static ngx_int_t
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363 ngx_stream_ssl_preread_server_name_variable(ngx_stream_session_t *s,
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364 ngx_variable_value_t *v, uintptr_t data)
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365 {
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366 ngx_stream_ssl_preread_ctx_t *ctx;
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367
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368 ctx = ngx_stream_get_module_ctx(s, ngx_stream_ssl_preread_module);
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369
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370 if (ctx == NULL) {
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371 v->not_found = 1;
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372 return NGX_OK;
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373 }
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374
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375 v->valid = 1;
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376 v->no_cacheable = 0;
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377 v->not_found = 0;
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378 v->len = ctx->host.len;
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379 v->data = ctx->host.data;
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380
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381 return NGX_OK;
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382 }
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383
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384
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385 static ngx_int_t
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386 ngx_stream_ssl_preread_add_variables(ngx_conf_t *cf)
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387 {
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388 ngx_stream_variable_t *var, *v;
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389
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390 for (v = ngx_stream_ssl_preread_vars; v->name.len; v++) {
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391 var = ngx_stream_add_variable(cf, &v->name, v->flags);
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392 if (var == NULL) {
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393 return NGX_ERROR;
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394 }
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395
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396 var->get_handler = v->get_handler;
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397 var->data = v->data;
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398 }
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399
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400 return NGX_OK;
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401 }
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402
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403
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404 static void *
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405 ngx_stream_ssl_preread_create_srv_conf(ngx_conf_t *cf)
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406 {
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407 ngx_stream_ssl_preread_srv_conf_t *conf;
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408
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409 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_ssl_preread_srv_conf_t));
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410 if (conf == NULL) {
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411 return NULL;
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412 }
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413
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414 conf->enabled = NGX_CONF_UNSET;
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415
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416 return conf;
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417 }
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418
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419
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420 static char *
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421 ngx_stream_ssl_preread_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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422 {
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423 ngx_stream_ssl_preread_srv_conf_t *prev = parent;
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424 ngx_stream_ssl_preread_srv_conf_t *conf = child;
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425
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426 ngx_conf_merge_value(conf->enabled, prev->enabled, 0);
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427
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428 return NGX_CONF_OK;
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429 }
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430
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431
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432 static ngx_int_t
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433 ngx_stream_ssl_preread_init(ngx_conf_t *cf)
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434 {
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435 ngx_stream_handler_pt *h;
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436 ngx_stream_core_main_conf_t *cmcf;
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437
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438 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
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439
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440 h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREREAD_PHASE].handlers);
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441 if (h == NULL) {
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442 return NGX_ERROR;
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443 }
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444
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445 *h = ngx_stream_ssl_preread_handler;
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446
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447 return NGX_OK;
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448 }
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