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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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0
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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
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11
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656
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12 typedef struct {
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13 ngx_flag_t pcre_jit;
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14 } ngx_regex_conf_t;
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15
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16
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52
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17 static void * ngx_libc_cdecl ngx_regex_malloc(size_t size);
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18 static void ngx_libc_cdecl ngx_regex_free(void *p);
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660
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19 #if (NGX_HAVE_PCRE_JIT)
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20 static void ngx_pcre_free_studies(void *data);
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21 #endif
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0
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22
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656
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23 static ngx_int_t ngx_regex_module_init(ngx_cycle_t *cycle);
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24
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25 static void *ngx_regex_create_conf(ngx_cycle_t *cycle);
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26 static char *ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf);
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27
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28 static char *ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data);
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29 static ngx_conf_post_t ngx_regex_pcre_jit_post = { ngx_regex_pcre_jit };
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30
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31
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32 static ngx_command_t ngx_regex_commands[] = {
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33
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34 { ngx_string("pcre_jit"),
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35 NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
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36 ngx_conf_set_flag_slot,
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37 0,
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38 offsetof(ngx_regex_conf_t, pcre_jit),
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39 &ngx_regex_pcre_jit_post },
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40
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41 ngx_null_command
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42 };
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43
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44
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45 static ngx_core_module_t ngx_regex_module_ctx = {
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46 ngx_string("regex"),
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47 ngx_regex_create_conf,
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48 ngx_regex_init_conf
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49 };
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50
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51
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52 ngx_module_t ngx_regex_module = {
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53 NGX_MODULE_V1,
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54 &ngx_regex_module_ctx, /* module context */
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55 ngx_regex_commands, /* module directives */
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56 NGX_CORE_MODULE, /* module type */
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57 NULL, /* init master */
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58 ngx_regex_module_init, /* init module */
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59 NULL, /* init process */
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60 NULL, /* init thread */
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61 NULL, /* exit thread */
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62 NULL, /* exit process */
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63 NULL, /* exit master */
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64 NGX_MODULE_V1_PADDING
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65 };
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66
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0
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67
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68 static ngx_pool_t *ngx_pcre_pool;
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656
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69 static ngx_list_t *ngx_pcre_studies;
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0
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70
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71
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52
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72 void
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73 ngx_regex_init(void)
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0
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74 {
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75 pcre_malloc = ngx_regex_malloc;
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76 pcre_free = ngx_regex_free;
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77 }
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78
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79
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546
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80 static ngx_inline void
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81 ngx_regex_malloc_init(ngx_pool_t *pool)
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0
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82 {
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83 #if (NGX_THREADS)
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84 ngx_core_tls_t *tls;
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85
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86 if (ngx_threaded) {
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87 tls = ngx_thread_get_tls(ngx_core_tls_key);
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88 tls->pool = pool;
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546
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89 return;
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0
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90 }
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91
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550
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92 #endif
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0
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93
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94 ngx_pcre_pool = pool;
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546
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95 }
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0
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96
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546
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97
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98 static ngx_inline void
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99 ngx_regex_malloc_done(void)
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100 {
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101 #if (NGX_THREADS)
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102 ngx_core_tls_t *tls;
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103
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104 if (ngx_threaded) {
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105 tls = ngx_thread_get_tls(ngx_core_tls_key);
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106 tls->pool = NULL;
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107 return;
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108 }
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109
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550
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110 #endif
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546
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111
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112 ngx_pcre_pool = NULL;
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113 }
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114
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115
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116 ngx_int_t
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117 ngx_regex_compile(ngx_regex_compile_t *rc)
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118 {
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656
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119 int n, erroff;
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120 char *p;
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121 pcre *re;
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122 const char *errstr;
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123 ngx_regex_elt_t *elt;
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546
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124
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125 ngx_regex_malloc_init(rc->pool);
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126
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127 re = pcre_compile((const char *) rc->pattern.data, (int) rc->options,
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0
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128 &errstr, &erroff, NULL);
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129
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546
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130 /* ensure that there is no current pool */
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131 ngx_regex_malloc_done();
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132
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0
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133 if (re == NULL) {
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546
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134 if ((size_t) erroff == rc->pattern.len) {
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135 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
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136 "pcre_compile() failed: %s in \"%V\"",
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137 errstr, &rc->pattern)
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138 - rc->err.data;
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139
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0
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140 } else {
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546
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141 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
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142 "pcre_compile() failed: %s in \"%V\" at \"%s\"",
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143 errstr, &rc->pattern, rc->pattern.data + erroff)
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144 - rc->err.data;
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0
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145 }
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546
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146
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147 return NGX_ERROR;
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148 }
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149
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656
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150 rc->regex = ngx_pcalloc(rc->pool, sizeof(ngx_regex_t));
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151 if (rc->regex == NULL) {
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152 return NGX_ERROR;
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153 }
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154
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676
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155 rc->regex->code = re;
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656
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156
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157 /* do not study at runtime */
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158
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159 if (ngx_pcre_studies != NULL) {
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160 elt = ngx_list_push(ngx_pcre_studies);
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161 if (elt == NULL) {
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162 return NGX_ERROR;
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163 }
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164
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165 elt->regex = rc->regex;
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166 elt->name = rc->pattern.data;
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167 }
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546
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168
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169 n = pcre_fullinfo(re, NULL, PCRE_INFO_CAPTURECOUNT, &rc->captures);
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170 if (n < 0) {
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171 p = "pcre_fullinfo(\"%V\", PCRE_INFO_CAPTURECOUNT) failed: %d";
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172 goto failed;
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173 }
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174
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175 if (rc->captures == 0) {
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176 return NGX_OK;
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0
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177 }
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178
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546
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179 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &rc->named_captures);
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180 if (n < 0) {
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181 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMECOUNT) failed: %d";
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182 goto failed;
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183 }
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184
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185 if (rc->named_captures == 0) {
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186 return NGX_OK;
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187 }
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0
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188
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546
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189 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &rc->name_size);
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190 if (n < 0) {
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191 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMEENTRYSIZE) failed: %d";
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192 goto failed;
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0
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193 }
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546
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194
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195 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &rc->names);
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196 if (n < 0) {
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197 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMETABLE) failed: %d";
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198 goto failed;
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199 }
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0
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200
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546
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201 return NGX_OK;
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202
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203 failed:
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204
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205 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len, p, &rc->pattern, n)
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206 - rc->err.data;
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207 return NGX_OK;
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0
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208 }
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209
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210
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52
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211 ngx_int_t
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358
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212 ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
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213 {
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214 ngx_int_t n;
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215 ngx_uint_t i;
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216 ngx_regex_elt_t *re;
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217
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218 re = a->elts;
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219
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220 for (i = 0; i < a->nelts; i++) {
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221
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222 n = ngx_regex_exec(re[i].regex, s, NULL, 0);
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223
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224 if (n == NGX_REGEX_NO_MATCHED) {
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225 continue;
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226 }
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227
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228 if (n < 0) {
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229 ngx_log_error(NGX_LOG_ALERT, log, 0,
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546
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230 ngx_regex_exec_n " failed: %i on \"%V\" using \"%s\"",
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358
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231 n, s, re[i].name);
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232 return NGX_ERROR;
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233 }
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234
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235 /* match */
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236
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237 return NGX_OK;
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238 }
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239
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240 return NGX_DECLINED;
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241 }
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242
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243
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52
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244 static void * ngx_libc_cdecl
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245 ngx_regex_malloc(size_t size)
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0
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246 {
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247 ngx_pool_t *pool;
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248 #if (NGX_THREADS)
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249 ngx_core_tls_t *tls;
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250
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251 if (ngx_threaded) {
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252 tls = ngx_thread_get_tls(ngx_core_tls_key);
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253 pool = tls->pool;
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546
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254
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0
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255 } else {
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256 pool = ngx_pcre_pool;
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257 }
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546
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258
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0
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259 #else
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546
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260
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0
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261 pool = ngx_pcre_pool;
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546
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262
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0
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263 #endif
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264
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265 if (pool) {
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382
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266 return ngx_palloc(pool, size);
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0
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267 }
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268
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269 return NULL;
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270 }
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271
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272
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52
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273 static void ngx_libc_cdecl
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274 ngx_regex_free(void *p)
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0
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275 {
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276 return;
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277 }
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656
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278
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279
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660
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280 #if (NGX_HAVE_PCRE_JIT)
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281
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282 static void
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283 ngx_pcre_free_studies(void *data)
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284 {
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285 ngx_list_t *studies = data;
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286
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287 ngx_uint_t i;
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288 ngx_list_part_t *part;
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289 ngx_regex_elt_t *elts;
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290
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291 part = &studies->part;
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292 elts = part->elts;
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293
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294 for (i = 0 ; /* void */ ; i++) {
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295
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296 if (i >= part->nelts) {
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297 if (part->next == NULL) {
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298 break;
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299 }
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300
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301 part = part->next;
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302 elts = part->elts;
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303 i = 0;
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304 }
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305
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306 if (elts[i].regex->extra != NULL) {
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307 pcre_free_study(elts[i].regex->extra);
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308 }
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309 }
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310 }
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311
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312 #endif
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313
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314
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656
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315 static ngx_int_t
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316 ngx_regex_module_init(ngx_cycle_t *cycle)
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317 {
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318 int opt;
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319 const char *errstr;
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320 ngx_uint_t i;
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321 ngx_list_part_t *part;
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322 ngx_regex_elt_t *elts;
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323
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324 opt = 0;
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325
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326 #if (NGX_HAVE_PCRE_JIT)
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327 {
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660
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328 ngx_regex_conf_t *rcf;
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329 ngx_pool_cleanup_t *cln;
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656
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330
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331 rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module);
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332
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333 if (rcf->pcre_jit) {
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334 opt = PCRE_STUDY_JIT_COMPILE;
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660
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335
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336 /*
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337 * The PCRE JIT compiler uses mmap for its executable codes, so we
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338 * have to explicitly call the pcre_free_study() function to free
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339 * this memory.
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340 */
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341
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342 cln = ngx_pool_cleanup_add(cycle->pool, 0);
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343 if (cln == NULL) {
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344 return NGX_ERROR;
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345 }
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346
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347 cln->handler = ngx_pcre_free_studies;
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348 cln->data = ngx_pcre_studies;
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656
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349 }
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350 }
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351 #endif
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352
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353 ngx_regex_malloc_init(cycle->pool);
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354
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355 part = &ngx_pcre_studies->part;
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356 elts = part->elts;
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357
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358 for (i = 0 ; /* void */ ; i++) {
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359
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360 if (i >= part->nelts) {
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361 if (part->next == NULL) {
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362 break;
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363 }
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364
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365 part = part->next;
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366 elts = part->elts;
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367 i = 0;
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368 }
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369
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676
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370 elts[i].regex->extra = pcre_study(elts[i].regex->code, opt, &errstr);
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656
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371
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372 if (errstr != NULL) {
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373 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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374 "pcre_study() failed: %s in \"%s\"",
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375 errstr, elts[i].name);
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376 }
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377
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378 #if (NGX_HAVE_PCRE_JIT)
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379 if (opt & PCRE_STUDY_JIT_COMPILE) {
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380 int jit, n;
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381
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382 jit = 0;
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676
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383 n = pcre_fullinfo(elts[i].regex->code, elts[i].regex->extra,
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656
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384 PCRE_INFO_JIT, &jit);
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385
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386 if (n != 0 || jit != 1) {
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387 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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388 "JIT compiler does not support pattern: \"%s\"",
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389 elts[i].name);
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390 }
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391 }
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392 #endif
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393 }
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394
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395 ngx_regex_malloc_done();
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396
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397 ngx_pcre_studies = NULL;
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398
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399 return NGX_OK;
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400 }
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401
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402
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403 static void *
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404 ngx_regex_create_conf(ngx_cycle_t *cycle)
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405 {
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406 ngx_regex_conf_t *rcf;
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407
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408 rcf = ngx_pcalloc(cycle->pool, sizeof(ngx_regex_conf_t));
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409 if (rcf == NULL) {
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410 return NULL;
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411 }
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412
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413 rcf->pcre_jit = NGX_CONF_UNSET;
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414
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415 ngx_pcre_studies = ngx_list_create(cycle->pool, 8, sizeof(ngx_regex_elt_t));
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416 if (ngx_pcre_studies == NULL) {
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417 return NULL;
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418 }
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419
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420 return rcf;
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421 }
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422
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423
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424 static char *
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425 ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf)
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426 {
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427 ngx_regex_conf_t *rcf = conf;
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428
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429 ngx_conf_init_value(rcf->pcre_jit, 0);
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430
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431 return NGX_CONF_OK;
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432 }
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433
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434
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435 static char *
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436 ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data)
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437 {
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438 ngx_flag_t *fp = data;
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439
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440 if (*fp == 0) {
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441 return NGX_CONF_OK;
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442 }
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443
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444 #if (NGX_HAVE_PCRE_JIT)
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445 {
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446 int jit, r;
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447
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448 jit = 0;
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449 r = pcre_config(PCRE_CONFIG_JIT, &jit);
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450
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451 if (r != 0 || jit != 1) {
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452 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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453 "PCRE library does not support JIT");
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454 *fp = 0;
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455 }
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456 }
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457 #else
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458 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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660
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459 "nginx was built without PCRE JIT support");
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656
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460 *fp = 0;
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461 #endif
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462
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463 return NGX_CONF_OK;
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464 }
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