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7713
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1
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2 /*
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3 * Copyright (C) Pavel Pautov
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_stream.h>
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11
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12
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13 typedef struct {
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14 ngx_int_t index;
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15 ngx_stream_set_variable_pt set_handler;
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16 uintptr_t data;
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17 ngx_stream_complex_value_t value;
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18 } ngx_stream_set_cmd_t;
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19
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20
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21 typedef struct {
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22 ngx_array_t commands;
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23 } ngx_stream_set_srv_conf_t;
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24
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25
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26 static ngx_int_t ngx_stream_set_handler(ngx_stream_session_t *s);
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27 static ngx_int_t ngx_stream_set_var(ngx_stream_session_t *s,
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28 ngx_stream_variable_value_t *v, uintptr_t data);
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29 static ngx_int_t ngx_stream_set_init(ngx_conf_t *cf);
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30 static void *ngx_stream_set_create_srv_conf(ngx_conf_t *cf);
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31 static char *ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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32
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33
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34 static ngx_command_t ngx_stream_set_commands[] = {
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35
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36 { ngx_string("set"),
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37 NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2,
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38 ngx_stream_set,
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39 NGX_STREAM_SRV_CONF_OFFSET,
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40 0,
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41 NULL },
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42
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43 ngx_null_command
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44 };
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45
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46
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47 static ngx_stream_module_t ngx_stream_set_module_ctx = {
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48 NULL, /* preconfiguration */
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49 ngx_stream_set_init, /* postconfiguration */
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50
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51 NULL, /* create main configuration */
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52 NULL, /* init main configuration */
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53
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54 ngx_stream_set_create_srv_conf, /* create server configuration */
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55 NULL /* merge server configuration */
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56 };
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57
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58
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59 ngx_module_t ngx_stream_set_module = {
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60 NGX_MODULE_V1,
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61 &ngx_stream_set_module_ctx, /* module context */
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62 ngx_stream_set_commands, /* module directives */
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63 NGX_STREAM_MODULE, /* module type */
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64 NULL, /* init master */
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65 NULL, /* init module */
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66 NULL, /* init process */
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67 NULL, /* init thread */
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68 NULL, /* exit thread */
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69 NULL, /* exit process */
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70 NULL, /* exit master */
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71 NGX_MODULE_V1_PADDING
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72 };
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73
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74
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75 static ngx_int_t
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76 ngx_stream_set_handler(ngx_stream_session_t *s)
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77 {
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78 ngx_str_t str;
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79 ngx_uint_t i;
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80 ngx_stream_set_cmd_t *cmds;
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81 ngx_stream_set_srv_conf_t *scf;
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82 ngx_stream_variable_value_t vv;
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83
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84 scf = ngx_stream_get_module_srv_conf(s, ngx_stream_set_module);
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85 cmds = scf->commands.elts;
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86 vv = ngx_stream_variable_null_value;
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87
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88 for (i = 0; i < scf->commands.nelts; i++) {
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89 if (ngx_stream_complex_value(s, &cmds[i].value, &str) != NGX_OK) {
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90 return NGX_ERROR;
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91 }
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92
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93 if (cmds[i].set_handler != NULL) {
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94 vv.len = str.len;
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95 vv.data = str.data;
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96 cmds[i].set_handler(s, &vv, cmds[i].data);
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97
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98 } else {
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99 s->variables[cmds[i].index].len = str.len;
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100 s->variables[cmds[i].index].valid = 1;
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101 s->variables[cmds[i].index].no_cacheable = 0;
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102 s->variables[cmds[i].index].not_found = 0;
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103 s->variables[cmds[i].index].data = str.data;
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104 }
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105 }
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106
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107 return NGX_DECLINED;
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108 }
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109
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110
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111 static ngx_int_t
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112 ngx_stream_set_var(ngx_stream_session_t *s, ngx_stream_variable_value_t *v,
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113 uintptr_t data)
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114 {
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115 *v = ngx_stream_variable_null_value;
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116
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117 return NGX_OK;
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118 }
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119
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120
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121 static ngx_int_t
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122 ngx_stream_set_init(ngx_conf_t *cf)
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123 {
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124 ngx_stream_handler_pt *h;
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125 ngx_stream_core_main_conf_t *cmcf;
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126
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127 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
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128
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129 h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers);
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130 if (h == NULL) {
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131 return NGX_ERROR;
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132 }
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133
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134 *h = ngx_stream_set_handler;
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135
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136 return NGX_OK;
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137 }
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138
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139
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140 static void *
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141 ngx_stream_set_create_srv_conf(ngx_conf_t *cf)
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142 {
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143 ngx_stream_set_srv_conf_t *conf;
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144
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145 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_set_srv_conf_t));
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146 if (conf == NULL) {
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147 return NULL;
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148 }
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149
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150 /*
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151 * set by ngx_pcalloc():
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152 *
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153 * conf->commands = { NULL };
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154 */
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155
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156 return conf;
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157 }
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158
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159
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160 static char *
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161 ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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162 {
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163 ngx_stream_set_srv_conf_t *scf = conf;
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164
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165 ngx_str_t *args;
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166 ngx_int_t index;
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167 ngx_stream_set_cmd_t *set_cmd;
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168 ngx_stream_variable_t *v;
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169 ngx_stream_compile_complex_value_t ccv;
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170
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171 args = cf->args->elts;
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172
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173 if (args[1].data[0] != '$') {
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174 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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175 "invalid variable name \"%V\"", &args[1]);
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176 return NGX_CONF_ERROR;
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177 }
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178
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179 args[1].len--;
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180 args[1].data++;
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181
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182 v = ngx_stream_add_variable(cf, &args[1],
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183 NGX_STREAM_VAR_CHANGEABLE|NGX_STREAM_VAR_WEAK);
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184 if (v == NULL) {
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185 return NGX_CONF_ERROR;
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186 }
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187
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188 index = ngx_stream_get_variable_index(cf, &args[1]);
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189 if (index == NGX_ERROR) {
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190 return NGX_CONF_ERROR;
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191 }
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192
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193 if (v->get_handler == NULL) {
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194 v->get_handler = ngx_stream_set_var;
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195 }
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196
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197 if (scf->commands.elts == NULL) {
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198 if (ngx_array_init(&scf->commands, cf->pool, 1,
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199 sizeof(ngx_stream_set_cmd_t))
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200 != NGX_OK)
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201 {
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202 return NGX_CONF_ERROR;
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203 }
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204 }
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205
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206 set_cmd = ngx_array_push(&scf->commands);
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207 if (set_cmd == NULL) {
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208 return NGX_CONF_ERROR;
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209 }
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210
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211 set_cmd->index = index;
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212 set_cmd->set_handler = v->set_handler;
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213 set_cmd->data = v->data;
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214
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215 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
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216
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217 ccv.cf = cf;
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218 ccv.value = &args[2];
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219 ccv.complex_value = &set_cmd->value;
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220
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221 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 return NGX_CONF_OK;
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226 }
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