Mercurial > hg > nginx-quic
annotate src/http/ngx_http_copy_filter_module.c @ 4487:a786c85e8268
Disable symlinks: don't allow creating or truncating a file via a symlink in
the last path component if "if_not_owner" parameter is used.
To prevent race condition we have to open a file before checking its owner and
there's no way to change access flags for already opened file descriptor, so
we disable symlinks for the last path component at all if flags allow creating
or truncating the file.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Tue, 21 Feb 2012 15:04:41 +0000 |
parents | 30eff7580d0c |
children | 586969d972b9 |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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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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12 |
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13 typedef struct { |
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14 ngx_bufs_t bufs; |
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15 } ngx_http_copy_filter_conf_t; |
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16 |
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17 |
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18 #if (NGX_HAVE_FILE_AIO) |
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19 static void ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, |
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20 ngx_file_t *file); |
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21 static void ngx_http_copy_aio_event_handler(ngx_event_t *ev); |
3065 | 22 #if (NGX_HAVE_AIO_SENDFILE) |
23 static void ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev); | |
24 #endif | |
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25 #endif |
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26 |
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27 static void *ngx_http_copy_filter_create_conf(ngx_conf_t *cf); |
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28 static char *ngx_http_copy_filter_merge_conf(ngx_conf_t *cf, |
501 | 29 void *parent, void *child); |
681 | 30 static ngx_int_t ngx_http_copy_filter_init(ngx_conf_t *cf); |
10
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31 |
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32 |
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33 static ngx_command_t ngx_http_copy_filter_commands[] = { |
10
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34 |
501 | 35 { ngx_string("output_buffers"), |
36 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, | |
37 ngx_conf_set_bufs_slot, | |
38 NGX_HTTP_LOC_CONF_OFFSET, | |
39 offsetof(ngx_http_copy_filter_conf_t, bufs), | |
40 NULL }, | |
10
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41 |
501 | 42 ngx_null_command |
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43 }; |
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44 |
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45 |
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46 static ngx_http_module_t ngx_http_copy_filter_module_ctx = { |
509 | 47 NULL, /* preconfiguration */ |
681 | 48 ngx_http_copy_filter_init, /* postconfiguration */ |
177
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49 |
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50 NULL, /* create main configuration */ |
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51 NULL, /* init main configuration */ |
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52 |
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53 NULL, /* create server configuration */ |
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54 NULL, /* merge server configuration */ |
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55 |
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56 ngx_http_copy_filter_create_conf, /* create location configuration */ |
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57 ngx_http_copy_filter_merge_conf /* merge location configuration */ |
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58 }; |
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59 |
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60 |
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61 ngx_module_t ngx_http_copy_filter_module = { |
509 | 62 NGX_MODULE_V1, |
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63 &ngx_http_copy_filter_module_ctx, /* module context */ |
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64 ngx_http_copy_filter_commands, /* module directives */ |
96
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65 NGX_HTTP_MODULE, /* module type */ |
541 | 66 NULL, /* init master */ |
681 | 67 NULL, /* init module */ |
541 | 68 NULL, /* init process */ |
69 NULL, /* init thread */ | |
70 NULL, /* exit thread */ | |
71 NULL, /* exit process */ | |
72 NULL, /* exit master */ | |
73 NGX_MODULE_V1_PADDING | |
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74 }; |
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75 |
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76 |
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77 static ngx_http_output_body_filter_pt ngx_http_next_filter; |
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78 |
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79 |
501 | 80 static ngx_int_t |
81 ngx_http_copy_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
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82 { |
583 | 83 ngx_int_t rc; |
84 ngx_connection_t *c; | |
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85 ngx_output_chain_ctx_t *ctx; |
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86 ngx_http_core_loc_conf_t *clcf; |
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87 ngx_http_copy_filter_conf_t *conf; |
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88 |
583 | 89 c = r->connection; |
90 | |
91 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
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92 "http copy filter: \"%V?%V\"", &r->uri, &r->args); |
509 | 93 |
94 ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module); | |
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95 |
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96 if (ctx == NULL) { |
501 | 97 ctx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)); |
98 if (ctx == NULL) { | |
99 return NGX_ERROR; | |
100 } | |
101 | |
102 ngx_http_set_ctx(r, ctx, ngx_http_copy_filter_module); | |
60
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103 |
3053 | 104 conf = ngx_http_get_module_loc_conf(r, ngx_http_copy_filter_module); |
105 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); | |
106 | |
583 | 107 ctx->sendfile = c->sendfile; |
513 | 108 ctx->need_in_memory = r->main_filter_need_in_memory |
109 || r->filter_need_in_memory; | |
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110 ctx->need_in_temp = r->filter_need_temporary; |
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111 |
3053 | 112 ctx->alignment = clcf->directio_alignment; |
113 | |
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114 ctx->pool = r->pool; |
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115 ctx->bufs = conf->bufs; |
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116 ctx->tag = (ngx_buf_tag_t) &ngx_http_copy_filter_module; |
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117 |
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118 ctx->output_filter = (ngx_output_chain_filter_pt) ngx_http_next_filter; |
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119 ctx->filter_ctx = r; |
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120 |
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121 #if (NGX_HAVE_FILE_AIO) |
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122 if (ngx_file_aio) { |
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123 if (clcf->aio) { |
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124 ctx->aio_handler = ngx_http_copy_aio_handler; |
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125 } |
3065 | 126 #if (NGX_HAVE_AIO_SENDFILE) |
127 c->aio_sendfile = (clcf->aio == NGX_HTTP_AIO_SENDFILE); | |
128 #endif | |
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129 } |
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130 #endif |
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131 |
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132 if (in && in->buf && ngx_buf_size(in->buf)) { |
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133 r->request_output = 1; |
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134 } |
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135 } |
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136 |
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137 #if (NGX_HAVE_FILE_AIO) |
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138 ctx->aio = r->aio; |
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139 #endif |
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140 |
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141 for ( ;; ) { |
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142 rc = ngx_output_chain(ctx, in); |
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144 if (ctx->in == NULL) { |
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145 r->buffered &= ~NGX_HTTP_COPY_BUFFERED; |
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146 |
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147 } else { |
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148 r->buffered |= NGX_HTTP_COPY_BUFFERED; |
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149 } |
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150 |
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151 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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152 "http copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args); |
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154 #if (NGX_HAVE_FILE_AIO && NGX_HAVE_AIO_SENDFILE) |
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156 if (c->busy_sendfile) { |
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157 ssize_t n; |
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158 off_t offset; |
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159 ngx_file_t *file; |
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160 ngx_http_ephemeral_t *e; |
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162 if (r->aio) { |
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163 c->busy_sendfile = NULL; |
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164 return rc; |
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165 } |
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166 |
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167 file = c->busy_sendfile->file; |
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168 offset = c->busy_sendfile->file_pos; |
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169 |
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170 if (file->aio) { |
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171 c->aio_sendfile = (offset != file->aio->last_offset); |
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172 file->aio->last_offset = offset; |
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174 if (c->aio_sendfile == 0) { |
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175 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
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176 "sendfile(%V) returned busy again", |
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177 &file->name); |
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178 } |
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179 } |
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180 |
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181 c->busy_sendfile = NULL; |
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182 e = (ngx_http_ephemeral_t *) &r->uri_start; |
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183 |
3085 | 184 n = ngx_file_aio_read(file, &e->aio_preload, 1, offset, r->pool); |
3065 | 185 |
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186 if (n > 0) { |
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187 in = NULL; |
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188 continue; |
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189 } |
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190 |
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191 rc = n; |
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192 |
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193 if (rc == NGX_AGAIN) { |
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194 file->aio->data = r; |
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195 file->aio->handler = ngx_http_copy_aio_sendfile_event_handler; |
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196 |
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197 r->main->blocked++; |
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198 r->aio = 1; |
3065 | 199 } |
200 } | |
201 #endif | |
202 | |
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203 return rc; |
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204 } |
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205 } |
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206 |
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207 |
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208 #if (NGX_HAVE_FILE_AIO) |
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209 |
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210 static void |
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211 ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, ngx_file_t *file) |
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212 { |
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213 ngx_http_request_t *r; |
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214 |
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215 r = ctx->filter_ctx; |
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216 |
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217 file->aio->data = r; |
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218 file->aio->handler = ngx_http_copy_aio_event_handler; |
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219 |
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220 r->main->blocked++; |
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221 r->aio = 1; |
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222 ctx->aio = 1; |
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223 } |
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224 |
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225 |
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226 static void |
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227 ngx_http_copy_aio_event_handler(ngx_event_t *ev) |
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228 { |
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229 ngx_event_aio_t *aio; |
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230 ngx_http_request_t *r; |
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231 |
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232 aio = ev->data; |
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233 r = aio->data; |
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234 |
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235 r->main->blocked--; |
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236 r->aio = 0; |
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237 |
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238 r->connection->write->handler(r->connection->write); |
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239 } |
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240 |
3065 | 241 |
242 #if (NGX_HAVE_AIO_SENDFILE) | |
243 | |
244 static void | |
245 ngx_http_copy_aio_sendfile_event_handler(ngx_event_t *ev) | |
246 { | |
247 ngx_event_aio_t *aio; | |
248 ngx_http_request_t *r; | |
249 | |
250 aio = ev->data; | |
251 r = aio->data; | |
252 | |
253 r->main->blocked--; | |
254 r->aio = 0; | |
255 ev->complete = 0; | |
256 | |
257 r->connection->write->handler(r->connection->write); | |
258 } | |
259 | |
260 #endif | |
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261 #endif |
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262 |
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263 |
501 | 264 static void * |
265 ngx_http_copy_filter_create_conf(ngx_conf_t *cf) | |
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266 { |
334
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267 ngx_http_copy_filter_conf_t *conf; |
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268 |
501 | 269 conf = ngx_palloc(cf->pool, sizeof(ngx_http_copy_filter_conf_t)); |
270 if (conf == NULL) { | |
271 return NULL; | |
272 } | |
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273 |
141
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274 conf->bufs.num = 0; |
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275 |
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276 return conf; |
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277 } |
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278 |
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279 |
501 | 280 static char * |
281 ngx_http_copy_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
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282 { |
334
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283 ngx_http_copy_filter_conf_t *prev = parent; |
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284 ngx_http_copy_filter_conf_t *conf = child; |
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285 |
160
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286 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 1, 32768); |
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287 |
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288 return NULL; |
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289 } |
334
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290 |
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291 |
501 | 292 static ngx_int_t |
681 | 293 ngx_http_copy_filter_init(ngx_conf_t *cf) |
334
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294 { |
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nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
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295 ngx_http_next_filter = ngx_http_top_body_filter; |
af451db3fe99
nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
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296 ngx_http_top_body_filter = ngx_http_copy_filter; |
af451db3fe99
nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
|
297 |
af451db3fe99
nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
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298 return NGX_OK; |
af451db3fe99
nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
|
299 } |
af451db3fe99
nginx-0.0.3-2004-05-12-09:37:55 import
Igor Sysoev <igor@sysoev.ru>
parents:
327
diff
changeset
|
300 |