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7071
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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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_http.h>
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11
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12
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13 typedef struct {
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14 ngx_array_t *lengths;
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15 ngx_array_t *values;
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16 ngx_str_t name;
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17
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18 unsigned code:10;
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19 unsigned test_dir:1;
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20 } ngx_http_try_file_t;
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21
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22
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23 typedef struct {
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24 ngx_http_try_file_t *try_files;
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25 } ngx_http_try_files_loc_conf_t;
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26
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27
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28 static ngx_int_t ngx_http_try_files_handler(ngx_http_request_t *r);
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29 static char *ngx_http_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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30 static void *ngx_http_try_files_create_loc_conf(ngx_conf_t *cf);
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31 static ngx_int_t ngx_http_try_files_init(ngx_conf_t *cf);
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32
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33
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34 static ngx_command_t ngx_http_try_files_commands[] = {
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35
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36 { ngx_string("try_files"),
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37 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
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38 ngx_http_try_files,
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39 NGX_HTTP_LOC_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_http_module_t ngx_http_try_files_module_ctx = {
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48 NULL, /* preconfiguration */
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49 ngx_http_try_files_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 NULL, /* create server configuration */
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55 NULL, /* merge server configuration */
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56
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57 ngx_http_try_files_create_loc_conf, /* create location configuration */
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58 NULL /* merge location configuration */
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59 };
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60
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61
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62 ngx_module_t ngx_http_try_files_module = {
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63 NGX_MODULE_V1,
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64 &ngx_http_try_files_module_ctx, /* module context */
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65 ngx_http_try_files_commands, /* module directives */
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66 NGX_HTTP_MODULE, /* module type */
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67 NULL, /* init master */
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68 NULL, /* init module */
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69 NULL, /* init process */
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70 NULL, /* init thread */
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71 NULL, /* exit thread */
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72 NULL, /* exit process */
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73 NULL, /* exit master */
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74 NGX_MODULE_V1_PADDING
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75 };
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76
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77
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78 static ngx_int_t
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79 ngx_http_try_files_handler(ngx_http_request_t *r)
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80 {
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81 size_t len, root, alias, reserve, allocated;
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82 u_char *p, *name;
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83 ngx_str_t path, args;
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84 ngx_uint_t test_dir;
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85 ngx_http_try_file_t *tf;
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86 ngx_open_file_info_t of;
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87 ngx_http_script_code_pt code;
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88 ngx_http_script_engine_t e;
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89 ngx_http_core_loc_conf_t *clcf;
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90 ngx_http_script_len_code_pt lcode;
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91 ngx_http_try_files_loc_conf_t *tlcf;
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92
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93 tlcf = ngx_http_get_module_loc_conf(r, ngx_http_try_files_module);
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94
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95 if (tlcf->try_files == NULL) {
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96 return NGX_DECLINED;
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97 }
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98
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99 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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100 "try files handler");
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101
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102 allocated = 0;
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103 root = 0;
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104 name = NULL;
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105 /* suppress MSVC warning */
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106 path.data = NULL;
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107
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108 tf = tlcf->try_files;
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109
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110 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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111
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112 alias = clcf->alias;
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113
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114 for ( ;; ) {
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115
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116 if (tf->lengths) {
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117 ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
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118
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119 e.ip = tf->lengths->elts;
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120 e.request = r;
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121
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122 /* 1 is for terminating '\0' as in static names */
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123 len = 1;
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124
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125 while (*(uintptr_t *) e.ip) {
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126 lcode = *(ngx_http_script_len_code_pt *) e.ip;
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127 len += lcode(&e);
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128 }
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129
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130 } else {
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131 len = tf->name.len;
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132 }
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133
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134 if (!alias) {
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135 reserve = len > r->uri.len ? len - r->uri.len : 0;
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136
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137 } else if (alias == NGX_MAX_SIZE_T_VALUE) {
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138 reserve = len;
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139
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140 } else {
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141 reserve = len > r->uri.len - alias ? len - (r->uri.len - alias) : 0;
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142 }
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143
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144 if (reserve > allocated || !allocated) {
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145
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146 /* 16 bytes are preallocation */
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147 allocated = reserve + 16;
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148
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149 if (ngx_http_map_uri_to_path(r, &path, &root, allocated) == NULL) {
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150 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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151 }
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152
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153 name = path.data + root;
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154 }
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155
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156 if (tf->values == NULL) {
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157
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158 /* tf->name.len includes the terminating '\0' */
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159
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160 ngx_memcpy(name, tf->name.data, tf->name.len);
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161
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162 path.len = (name + tf->name.len - 1) - path.data;
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163
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164 } else {
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165 e.ip = tf->values->elts;
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166 e.pos = name;
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167 e.flushed = 1;
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168
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169 while (*(uintptr_t *) e.ip) {
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170 code = *(ngx_http_script_code_pt *) e.ip;
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171 code((ngx_http_script_engine_t *) &e);
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172 }
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173
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174 path.len = e.pos - path.data;
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175
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176 *e.pos = '\0';
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177
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178 if (alias && alias != NGX_MAX_SIZE_T_VALUE
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179 && ngx_strncmp(name, r->uri.data, alias) == 0)
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180 {
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181 ngx_memmove(name, name + alias, len - alias);
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182 path.len -= alias;
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183 }
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184 }
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185
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186 test_dir = tf->test_dir;
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187
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188 tf++;
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189
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190 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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191 "trying to use %s: \"%s\" \"%s\"",
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192 test_dir ? "dir" : "file", name, path.data);
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193
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194 if (tf->lengths == NULL && tf->name.len == 0) {
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195
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196 if (tf->code) {
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197 return tf->code;
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198 }
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199
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200 path.len -= root;
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201 path.data += root;
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202
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203 if (path.data[0] == '@') {
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204 (void) ngx_http_named_location(r, &path);
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205
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206 } else {
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207 ngx_http_split_args(r, &path, &args);
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208
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209 (void) ngx_http_internal_redirect(r, &path, &args);
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210 }
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211
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212 ngx_http_finalize_request(r, NGX_DONE);
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213 return NGX_DONE;
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214 }
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215
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216 ngx_memzero(&of, sizeof(ngx_open_file_info_t));
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217
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218 of.read_ahead = clcf->read_ahead;
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219 of.directio = clcf->directio;
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220 of.valid = clcf->open_file_cache_valid;
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221 of.min_uses = clcf->open_file_cache_min_uses;
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222 of.test_only = 1;
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223 of.errors = clcf->open_file_cache_errors;
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224 of.events = clcf->open_file_cache_events;
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225
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226 if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
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227 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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228 }
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229
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230 if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
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231 != NGX_OK)
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232 {
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233 if (of.err == 0) {
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234 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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235 }
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236
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237 if (of.err != NGX_ENOENT
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238 && of.err != NGX_ENOTDIR
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239 && of.err != NGX_ENAMETOOLONG)
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240 {
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241 ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
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242 "%s \"%s\" failed", of.failed, path.data);
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243 }
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244
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245 continue;
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246 }
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247
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248 if (of.is_dir != test_dir) {
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249 continue;
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250 }
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251
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252 path.len -= root;
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253 path.data += root;
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254
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255 if (!alias) {
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256 r->uri = path;
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257
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258 } else if (alias == NGX_MAX_SIZE_T_VALUE) {
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259 if (!test_dir) {
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260 r->uri = path;
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261 r->add_uri_to_alias = 1;
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262 }
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263
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264 } else {
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265 name = r->uri.data;
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266
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267 r->uri.len = alias + path.len;
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268 r->uri.data = ngx_pnalloc(r->pool, r->uri.len);
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269 if (r->uri.data == NULL) {
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270 r->uri.len = 0;
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271 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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272 }
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273
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274 p = ngx_copy(r->uri.data, name, alias);
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275 ngx_memcpy(p, path.data, path.len);
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276 }
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277
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278 ngx_http_set_exten(r);
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279
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280 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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281 "try file uri: \"%V\"", &r->uri);
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282
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283 return NGX_DECLINED;
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284 }
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285
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286 /* not reached */
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287 }
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288
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289
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290 static char *
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291 ngx_http_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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292 {
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293 ngx_http_try_files_loc_conf_t *tlcf = conf;
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294
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295 ngx_str_t *value;
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296 ngx_int_t code;
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297 ngx_uint_t i, n;
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298 ngx_http_try_file_t *tf;
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299 ngx_http_script_compile_t sc;
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300
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301 if (tlcf->try_files) {
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302 return "is duplicate";
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303 }
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304
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305 tf = ngx_pcalloc(cf->pool, cf->args->nelts * sizeof(ngx_http_try_file_t));
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306 if (tf == NULL) {
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307 return NGX_CONF_ERROR;
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308 }
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309
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310 tlcf->try_files = tf;
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311
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312 value = cf->args->elts;
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313
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314 for (i = 0; i < cf->args->nelts - 1; i++) {
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315
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316 tf[i].name = value[i + 1];
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317
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318 if (tf[i].name.len > 0
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319 && tf[i].name.data[tf[i].name.len - 1] == '/'
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320 && i + 2 < cf->args->nelts)
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321 {
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322 tf[i].test_dir = 1;
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323 tf[i].name.len--;
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324 tf[i].name.data[tf[i].name.len] = '\0';
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325 }
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326
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327 n = ngx_http_script_variables_count(&tf[i].name);
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328
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329 if (n) {
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330 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
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331
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332 sc.cf = cf;
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333 sc.source = &tf[i].name;
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334 sc.lengths = &tf[i].lengths;
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335 sc.values = &tf[i].values;
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336 sc.variables = n;
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337 sc.complete_lengths = 1;
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338 sc.complete_values = 1;
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339
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340 if (ngx_http_script_compile(&sc) != NGX_OK) {
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341 return NGX_CONF_ERROR;
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342 }
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343
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344 } else {
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345 /* add trailing '\0' to length */
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346 tf[i].name.len++;
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347 }
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348 }
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349
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350 if (tf[i - 1].name.data[0] == '=') {
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351
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352 code = ngx_atoi(tf[i - 1].name.data + 1, tf[i - 1].name.len - 2);
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353
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354 if (code == NGX_ERROR || code > 999) {
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355 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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356 "invalid code \"%*s\"",
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357 tf[i - 1].name.len - 1, tf[i - 1].name.data);
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358 return NGX_CONF_ERROR;
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359 }
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360
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361 tf[i].code = code;
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362 }
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363
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364 return NGX_CONF_OK;
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365 }
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366
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367
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368 static void *
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369 ngx_http_try_files_create_loc_conf(ngx_conf_t *cf)
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370 {
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371 ngx_http_try_files_loc_conf_t *tlcf;
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372
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373 tlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_try_files_loc_conf_t));
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374 if (tlcf == NULL) {
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375 return NULL;
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376 }
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377
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378 /*
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379 * set by ngx_pcalloc():
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380 *
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381 * tlcf->try_files = NULL;
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382 */
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383
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384 return tlcf;
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385 }
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386
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387
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388 static ngx_int_t
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389 ngx_http_try_files_init(ngx_conf_t *cf)
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390 {
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391 ngx_http_handler_pt *h;
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392 ngx_http_core_main_conf_t *cmcf;
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393
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394 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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395
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396 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PRECONTENT_PHASE].handlers);
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397 if (h == NULL) {
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398 return NGX_ERROR;
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399 }
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400
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401 *h = ngx_http_try_files_handler;
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402
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403 return NGX_OK;
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404 }
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