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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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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
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10
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656
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11 typedef struct {
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12 ngx_flag_t pcre_jit;
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13 } ngx_regex_conf_t;
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14
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15
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52
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16 static void * ngx_libc_cdecl ngx_regex_malloc(size_t size);
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17 static void ngx_libc_cdecl ngx_regex_free(void *p);
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0
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18
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656
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19 static ngx_int_t ngx_regex_module_init(ngx_cycle_t *cycle);
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20
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21 static void *ngx_regex_create_conf(ngx_cycle_t *cycle);
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22 static char *ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf);
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23
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24 static char *ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data);
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25 static ngx_conf_post_t ngx_regex_pcre_jit_post = { ngx_regex_pcre_jit };
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26
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27
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28 static ngx_command_t ngx_regex_commands[] = {
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29
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30 { ngx_string("pcre_jit"),
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31 NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
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32 ngx_conf_set_flag_slot,
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33 0,
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34 offsetof(ngx_regex_conf_t, pcre_jit),
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35 &ngx_regex_pcre_jit_post },
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36
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37 ngx_null_command
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38 };
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39
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40
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41 static ngx_core_module_t ngx_regex_module_ctx = {
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42 ngx_string("regex"),
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43 ngx_regex_create_conf,
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44 ngx_regex_init_conf
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45 };
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46
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47
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48 ngx_module_t ngx_regex_module = {
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49 NGX_MODULE_V1,
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50 &ngx_regex_module_ctx, /* module context */
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51 ngx_regex_commands, /* module directives */
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52 NGX_CORE_MODULE, /* module type */
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53 NULL, /* init master */
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54 ngx_regex_module_init, /* init module */
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55 NULL, /* init process */
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56 NULL, /* init thread */
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57 NULL, /* exit thread */
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58 NULL, /* exit process */
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59 NULL, /* exit master */
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60 NGX_MODULE_V1_PADDING
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61 };
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62
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0
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63
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64 static ngx_pool_t *ngx_pcre_pool;
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656
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65 static ngx_list_t *ngx_pcre_studies;
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0
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66
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67
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52
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68 void
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69 ngx_regex_init(void)
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0
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70 {
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71 pcre_malloc = ngx_regex_malloc;
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72 pcre_free = ngx_regex_free;
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73 }
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74
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75
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546
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76 static ngx_inline void
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77 ngx_regex_malloc_init(ngx_pool_t *pool)
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0
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78 {
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79 #if (NGX_THREADS)
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80 ngx_core_tls_t *tls;
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81
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82 if (ngx_threaded) {
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83 tls = ngx_thread_get_tls(ngx_core_tls_key);
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84 tls->pool = pool;
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546
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85 return;
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0
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86 }
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87
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550
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88 #endif
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0
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89
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90 ngx_pcre_pool = pool;
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546
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91 }
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0
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92
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546
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93
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94 static ngx_inline void
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95 ngx_regex_malloc_done(void)
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96 {
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97 #if (NGX_THREADS)
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98 ngx_core_tls_t *tls;
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99
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100 if (ngx_threaded) {
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101 tls = ngx_thread_get_tls(ngx_core_tls_key);
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102 tls->pool = NULL;
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103 return;
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104 }
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105
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550
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106 #endif
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546
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107
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108 ngx_pcre_pool = NULL;
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109 }
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110
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111
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112 ngx_int_t
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113 ngx_regex_compile(ngx_regex_compile_t *rc)
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114 {
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656
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115 int n, erroff;
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116 char *p;
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117 pcre *re;
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118 const char *errstr;
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119 ngx_regex_elt_t *elt;
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546
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120
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121 ngx_regex_malloc_init(rc->pool);
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122
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123 re = pcre_compile((const char *) rc->pattern.data, (int) rc->options,
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0
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124 &errstr, &erroff, NULL);
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125
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546
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126 /* ensure that there is no current pool */
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127 ngx_regex_malloc_done();
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128
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0
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129 if (re == NULL) {
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546
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130 if ((size_t) erroff == rc->pattern.len) {
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131 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
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132 "pcre_compile() failed: %s in \"%V\"",
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133 errstr, &rc->pattern)
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134 - rc->err.data;
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135
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0
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136 } else {
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546
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137 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
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138 "pcre_compile() failed: %s in \"%V\" at \"%s\"",
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139 errstr, &rc->pattern, rc->pattern.data + erroff)
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140 - rc->err.data;
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0
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141 }
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546
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142
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143 return NGX_ERROR;
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144 }
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145
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656
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146 rc->regex = ngx_pcalloc(rc->pool, sizeof(ngx_regex_t));
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147 if (rc->regex == NULL) {
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148 return NGX_ERROR;
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149 }
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150
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151 rc->regex->pcre = re;
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152
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153 /* do not study at runtime */
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154
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155 if (ngx_pcre_studies != NULL) {
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156 elt = ngx_list_push(ngx_pcre_studies);
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157 if (elt == NULL) {
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158 return NGX_ERROR;
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159 }
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160
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161 elt->regex = rc->regex;
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162 elt->name = rc->pattern.data;
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163 }
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546
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164
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165 n = pcre_fullinfo(re, NULL, PCRE_INFO_CAPTURECOUNT, &rc->captures);
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166 if (n < 0) {
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167 p = "pcre_fullinfo(\"%V\", PCRE_INFO_CAPTURECOUNT) failed: %d";
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168 goto failed;
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169 }
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170
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171 if (rc->captures == 0) {
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172 return NGX_OK;
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0
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173 }
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174
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546
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175 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &rc->named_captures);
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176 if (n < 0) {
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177 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMECOUNT) failed: %d";
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178 goto failed;
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179 }
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180
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181 if (rc->named_captures == 0) {
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182 return NGX_OK;
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183 }
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0
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184
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546
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185 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &rc->name_size);
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186 if (n < 0) {
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187 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMEENTRYSIZE) failed: %d";
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188 goto failed;
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0
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189 }
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546
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190
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191 n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &rc->names);
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192 if (n < 0) {
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193 p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMETABLE) failed: %d";
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194 goto failed;
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195 }
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0
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196
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546
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197 return NGX_OK;
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198
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199 failed:
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200
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201 rc->err.len = ngx_snprintf(rc->err.data, rc->err.len, p, &rc->pattern, n)
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202 - rc->err.data;
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203 return NGX_OK;
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0
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204 }
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205
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206
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52
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207 ngx_int_t
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358
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208 ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
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209 {
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210 ngx_int_t n;
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211 ngx_uint_t i;
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212 ngx_regex_elt_t *re;
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213
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214 re = a->elts;
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215
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216 for (i = 0; i < a->nelts; i++) {
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217
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218 n = ngx_regex_exec(re[i].regex, s, NULL, 0);
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219
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220 if (n == NGX_REGEX_NO_MATCHED) {
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221 continue;
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222 }
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223
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224 if (n < 0) {
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225 ngx_log_error(NGX_LOG_ALERT, log, 0,
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546
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226 ngx_regex_exec_n " failed: %i on \"%V\" using \"%s\"",
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358
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227 n, s, re[i].name);
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228 return NGX_ERROR;
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229 }
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230
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231 /* match */
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232
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233 return NGX_OK;
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234 }
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235
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236 return NGX_DECLINED;
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237 }
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238
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239
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52
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240 static void * ngx_libc_cdecl
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241 ngx_regex_malloc(size_t size)
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0
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242 {
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243 ngx_pool_t *pool;
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244 #if (NGX_THREADS)
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245 ngx_core_tls_t *tls;
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246
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247 if (ngx_threaded) {
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248 tls = ngx_thread_get_tls(ngx_core_tls_key);
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249 pool = tls->pool;
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546
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250
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0
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251 } else {
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252 pool = ngx_pcre_pool;
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253 }
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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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546
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256
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0
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257 pool = ngx_pcre_pool;
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546
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258
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0
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259 #endif
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260
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261 if (pool) {
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382
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262 return ngx_palloc(pool, size);
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0
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263 }
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264
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265 return NULL;
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266 }
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267
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268
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52
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269 static void ngx_libc_cdecl
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270 ngx_regex_free(void *p)
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0
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271 {
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272 return;
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273 }
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656
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274
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275
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276 static ngx_int_t
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277 ngx_regex_module_init(ngx_cycle_t *cycle)
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278 {
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279 int opt;
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280 const char *errstr;
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281 ngx_uint_t i;
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282 ngx_list_part_t *part;
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283 ngx_regex_elt_t *elts;
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284
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285 opt = 0;
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286
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287 #if (NGX_HAVE_PCRE_JIT)
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288 {
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289 ngx_regex_conf_t *rcf;
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290
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291 rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module);
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292
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293 if (rcf->pcre_jit) {
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294 opt = PCRE_STUDY_JIT_COMPILE;
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295 }
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296 }
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297 #endif
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298
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299 ngx_regex_malloc_init(cycle->pool);
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300
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301 part = &ngx_pcre_studies->part;
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302 elts = part->elts;
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303
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304 for (i = 0 ; /* void */ ; i++) {
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305
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306 if (i >= part->nelts) {
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307 if (part->next == NULL) {
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308 break;
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309 }
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310
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311 part = part->next;
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312 elts = part->elts;
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313 i = 0;
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314 }
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315
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316 elts[i].regex->extra = pcre_study(elts[i].regex->pcre, opt, &errstr);
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317
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318 if (errstr != NULL) {
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319 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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320 "pcre_study() failed: %s in \"%s\"",
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321 errstr, elts[i].name);
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322 }
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323
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324 #if (NGX_HAVE_PCRE_JIT)
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325 if (opt & PCRE_STUDY_JIT_COMPILE) {
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326 int jit, n;
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327
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328 jit = 0;
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329 n = pcre_fullinfo(elts[i].regex->pcre, elts[i].regex->extra,
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330 PCRE_INFO_JIT, &jit);
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331
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332 if (n != 0 || jit != 1) {
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333 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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334 "JIT compiler does not support pattern: \"%s\"",
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335 elts[i].name);
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336 }
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337 }
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338 #endif
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339 }
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340
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341 ngx_regex_malloc_done();
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342
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343 ngx_pcre_studies = NULL;
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344
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345 return NGX_OK;
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346 }
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347
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348
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349 static void *
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350 ngx_regex_create_conf(ngx_cycle_t *cycle)
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351 {
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352 ngx_regex_conf_t *rcf;
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353
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354 rcf = ngx_pcalloc(cycle->pool, sizeof(ngx_regex_conf_t));
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355 if (rcf == NULL) {
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356 return NULL;
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357 }
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358
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359 rcf->pcre_jit = NGX_CONF_UNSET;
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360
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361 ngx_pcre_studies = ngx_list_create(cycle->pool, 8, sizeof(ngx_regex_elt_t));
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362 if (ngx_pcre_studies == NULL) {
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363 return NULL;
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364 }
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365
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366 return rcf;
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367 }
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368
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369
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370 static char *
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371 ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf)
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372 {
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373 ngx_regex_conf_t *rcf = conf;
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374
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375 ngx_conf_init_value(rcf->pcre_jit, 0);
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376
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377 return NGX_CONF_OK;
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378 }
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379
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380
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381 static char *
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382 ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data)
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383 {
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384 ngx_flag_t *fp = data;
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385
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386 if (*fp == 0) {
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387 return NGX_CONF_OK;
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388 }
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389
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390 #if (NGX_HAVE_PCRE_JIT)
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391 {
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392 int jit, r;
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393
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394 jit = 0;
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395 r = pcre_config(PCRE_CONFIG_JIT, &jit);
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396
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397 if (r != 0 || jit != 1) {
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398 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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399 "PCRE library does not support JIT");
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400 *fp = 0;
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401 }
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402 }
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403 #else
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404 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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405 "nginx was build without PCRE JIT support");
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406 *fp = 0;
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407 #endif
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408
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409 return NGX_CONF_OK;
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410 }
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