1 /* 2 * uhttpd - Tiny single-threaded httpd 3 * 4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org> 5 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <arpa/inet.h> 21 #include <libubox/blobmsg.h> 22 #include "uhttpd.h" 23 24 #define __headers \ 25 __header(accept, accept) \ 26 __header(accept_charset, accept-charset) \ 27 __header(accept_encoding, accept-encoding) \ 28 __header(accept_language, accept-language) \ 29 __header(authorization, authorization) \ 30 __header(connection, connection) \ 31 __header(cookie, cookie) \ 32 __header(host, host) \ 33 __header(origin, origin) \ 34 __header(referer, referer) \ 35 __header(user_agent, user-agent) \ 36 __header(content_type, content-type) \ 37 __header(content_length, content-length) \ 38 __header(x_http_method_override, x-http-method-override) \ 39 __header(http_auth_user, http-auth-user) \ 40 __header(http_auth_pass, http-auth-pass) 41 42 #undef __header 43 #define __header __enum_header 44 enum client_hdr { 45 __headers 46 __HDR_MAX, 47 }; 48 49 #undef __header 50 #define __header __blobmsg_header 51 static const struct blobmsg_policy hdr_policy[__HDR_MAX] = { 52 __headers 53 }; 54 55 static const struct { 56 const char *name; 57 int idx; 58 } proc_header_env[] = { 59 { "HTTP_ACCEPT", HDR_accept }, 60 { "HTTP_ACCEPT_CHARSET", HDR_accept_charset }, 61 { "HTTP_ACCEPT_ENCODING", HDR_accept_encoding }, 62 { "HTTP_ACCEPT_LANGUAGE", HDR_accept_language }, 63 { "HTTP_AUTHORIZATION", HDR_authorization }, 64 { "HTTP_CONNECTION", HDR_connection }, 65 { "HTTP_COOKIE", HDR_cookie }, 66 { "HTTP_HOST", HDR_host }, 67 { "HTTP_ORIGIN", HDR_origin }, 68 { "HTTP_REFERER", HDR_referer }, 69 { "HTTP_USER_AGENT", HDR_user_agent }, 70 { "HTTP_X_HTTP_METHOD_OVERRIDE", HDR_x_http_method_override }, 71 { "HTTP_AUTH_USER", HDR_http_auth_user }, 72 { "HTTP_AUTH_PASS", HDR_http_auth_pass }, 73 { "CONTENT_TYPE", HDR_content_type }, 74 { "CONTENT_LENGTH", HDR_content_length }, 75 }; 76 77 enum extra_vars { 78 /* no update needed */ 79 _VAR_GW, 80 _VAR_SOFTWARE, 81 82 /* updated by uh_get_process_vars */ 83 VAR_SCRIPT_NAME, 84 VAR_SCRIPT_FILE, 85 VAR_DOCROOT, 86 VAR_QUERY, 87 VAR_REQUEST, 88 VAR_PROTO, 89 VAR_METHOD, 90 VAR_PATH_INFO, 91 VAR_USER, 92 VAR_HTTPS, 93 VAR_REDIRECT, 94 VAR_SERVER_NAME, 95 VAR_SERVER_ADDR, 96 VAR_SERVER_PORT, 97 VAR_REMOTE_NAME, 98 VAR_REMOTE_ADDR, 99 VAR_REMOTE_PORT, 100 101 __VAR_MAX, 102 }; 103 104 static char local_addr[INET6_ADDRSTRLEN], remote_addr[INET6_ADDRSTRLEN]; 105 static char local_port[6], remote_port[6]; 106 static char redirect_status[4]; 107 108 static struct env_var extra_vars[] = { 109 [_VAR_GW] = { "GATEWAY_INTERFACE", "CGI/1.1" }, 110 [_VAR_SOFTWARE] = { "SERVER_SOFTWARE", "uhttpd" }, 111 [VAR_SCRIPT_NAME] = { "SCRIPT_NAME" }, 112 [VAR_SCRIPT_FILE] = { "SCRIPT_FILENAME" }, 113 [VAR_DOCROOT] = { "DOCUMENT_ROOT" }, 114 [VAR_QUERY] = { "QUERY_STRING" }, 115 [VAR_REQUEST] = { "REQUEST_URI" }, 116 [VAR_PROTO] = { "SERVER_PROTOCOL" }, 117 [VAR_METHOD] = { "REQUEST_METHOD" }, 118 [VAR_PATH_INFO] = { "PATH_INFO" }, 119 [VAR_USER] = { "REMOTE_USER" }, 120 [VAR_HTTPS] = { "HTTPS" }, 121 [VAR_REDIRECT] = { "REDIRECT_STATUS", redirect_status }, 122 [VAR_SERVER_NAME] = { "SERVER_NAME", local_addr }, 123 [VAR_SERVER_ADDR] = { "SERVER_ADDR", local_addr }, 124 [VAR_SERVER_PORT] = { "SERVER_PORT", local_port }, 125 [VAR_REMOTE_NAME] = { "REMOTE_HOST", remote_addr }, 126 [VAR_REMOTE_ADDR] = { "REMOTE_ADDR", remote_addr }, 127 [VAR_REMOTE_PORT] = { "REMOTE_PORT", remote_port }, 128 }; 129 130 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi) 131 { 132 struct http_request *req = &cl->request; 133 struct blob_attr *data = cl->hdr.head; 134 struct env_var *vars = (void *) uh_buf; 135 struct blob_attr *tb[__HDR_MAX]; 136 const char *url; 137 int len; 138 int i; 139 140 url = blobmsg_data(blob_data(cl->hdr.head)); 141 len = ARRAY_SIZE(proc_header_env); 142 len += ARRAY_SIZE(extra_vars); 143 len *= sizeof(struct env_var); 144 145 BUILD_BUG_ON(sizeof(uh_buf) < len); 146 147 extra_vars[VAR_SCRIPT_NAME].value = pi->name; 148 extra_vars[VAR_SCRIPT_FILE].value = pi->phys; 149 extra_vars[VAR_DOCROOT].value = pi->root; 150 extra_vars[VAR_QUERY].value = pi->query ? pi->query : ""; 151 extra_vars[VAR_REQUEST].value = url; 152 extra_vars[VAR_PROTO].value = http_versions[req->version]; 153 extra_vars[VAR_METHOD].value = http_methods[req->method]; 154 extra_vars[VAR_PATH_INFO].value = pi->info; 155 extra_vars[VAR_USER].value = req->realm ? req->realm->user : NULL; 156 extra_vars[VAR_HTTPS].value = cl->tls ? "on" : NULL; 157 158 snprintf(redirect_status, sizeof(redirect_status), 159 "%d", req->redirect_status); 160 inet_ntop(cl->srv_addr.family, &cl->srv_addr.in, local_addr, sizeof(local_addr)); 161 snprintf(local_port, sizeof(local_port), "%d", cl->srv_addr.port); 162 inet_ntop(cl->peer_addr.family, &cl->peer_addr.in, remote_addr, sizeof(remote_addr)); 163 snprintf(remote_port, sizeof(remote_port), "%d", cl->peer_addr.port); 164 165 blobmsg_parse(hdr_policy, __HDR_MAX, tb, blob_data(data), blob_len(data)); 166 for (i = 0; i < ARRAY_SIZE(proc_header_env); i++) { 167 struct blob_attr *cur; 168 169 cur = tb[proc_header_env[i].idx]; 170 vars[i].name = proc_header_env[i].name; 171 vars[i].value = cur ? blobmsg_data(cur) : NULL; 172 } 173 174 memcpy(&vars[i], extra_vars, sizeof(extra_vars)); 175 i += ARRAY_SIZE(extra_vars); 176 vars[i].name = NULL; 177 vars[i].value = NULL; 178 179 return vars; 180 } 181 182 static void proc_close_fds(struct client *cl) 183 { 184 struct dispatch_proc *p = &cl->dispatch.proc; 185 186 close(p->r.sfd.fd.fd); 187 if (p->wrfd.fd >= 0) 188 close(p->wrfd.fd); 189 } 190 191 static void proc_handle_close(struct relay *r, int ret) 192 { 193 if (r->header_cb) { 194 uh_client_error(r->cl, 502, "Bad Gateway", 195 "The process did not produce any response"); 196 return; 197 } 198 199 uh_request_done(r->cl); 200 } 201 202 static void proc_handle_header(struct relay *r, const char *name, const char *val) 203 { 204 static char status_buf[64]; 205 struct client *cl = r->cl; 206 char *sep; 207 char buf[4]; 208 209 if (!strcmp(name, "Status")) { 210 sep = strchr(val, ' '); 211 if (sep != val + 3) 212 return; 213 214 memcpy(buf, val, 3); 215 buf[3] = 0; 216 snprintf(status_buf, sizeof(status_buf), "%s", sep + 1); 217 cl->dispatch.proc.status_msg = status_buf; 218 cl->dispatch.proc.status_code = atoi(buf); 219 return; 220 } 221 222 blobmsg_add_string(&cl->dispatch.proc.hdr, name, val); 223 } 224 225 static void proc_handle_header_end(struct relay *r) 226 { 227 struct client *cl = r->cl; 228 struct blob_attr *cur; 229 int rem; 230 231 uh_http_header(cl, cl->dispatch.proc.status_code, cl->dispatch.proc.status_msg); 232 blob_for_each_attr(cur, cl->dispatch.proc.hdr.head, rem) 233 ustream_printf(cl->us, "%s: %s\r\n", blobmsg_name(cur), 234 blobmsg_get_string(cur)); 235 236 ustream_printf(cl->us, "\r\n"); 237 238 if (cl->request.method == UH_HTTP_MSG_HEAD) 239 r->skip_data = true; 240 } 241 242 static void proc_write_close(struct client *cl) 243 { 244 struct dispatch_proc *p = &cl->dispatch.proc; 245 246 if (p->wrfd.fd < 0) 247 return; 248 249 uloop_fd_delete(&p->wrfd); 250 close(p->wrfd.fd); 251 p->wrfd.fd = -1; 252 } 253 254 static void proc_free(struct client *cl) 255 { 256 struct dispatch_proc *p = &cl->dispatch.proc; 257 258 uloop_timeout_cancel(&p->timeout); 259 blob_buf_free(&p->hdr); 260 proc_write_close(cl); 261 uh_relay_free(&p->r); 262 } 263 264 static void proc_write_cb(struct uloop_fd *fd, unsigned int events) 265 { 266 struct client *cl = container_of(fd, struct client, dispatch.proc.wrfd); 267 268 client_poll_post_data(cl); 269 } 270 271 static void proc_relay_write_cb(struct client *cl) 272 { 273 struct dispatch_proc *p = &cl->dispatch.proc; 274 275 if (ustream_pending_data(cl->us, true)) 276 return; 277 278 ustream_set_read_blocked(&p->r.sfd.stream, false); 279 p->r.sfd.stream.notify_read(&p->r.sfd.stream, 0); 280 } 281 282 static int proc_data_send(struct client *cl, const char *data, int len) 283 { 284 struct dispatch_proc *p = &cl->dispatch.proc; 285 int retlen = 0; 286 int ret; 287 288 while (len) { 289 ret = write(p->wrfd.fd, data, len); 290 291 if (ret < 0) { 292 if (errno == EINTR) 293 continue; 294 295 if (errno == EAGAIN || errno == EWOULDBLOCK) 296 break; 297 298 /* consume all data */ 299 ret = len; 300 } 301 302 if (!ret) 303 break; 304 305 retlen += ret; 306 len -= ret; 307 data += ret; 308 } 309 310 if (len) 311 uloop_fd_add(&p->wrfd, ULOOP_WRITE); 312 else 313 uloop_fd_delete(&p->wrfd); 314 315 return retlen; 316 } 317 318 static void proc_timeout_cb(struct uloop_timeout *timeout) 319 { 320 struct dispatch_proc *proc = container_of(timeout, struct dispatch_proc, timeout); 321 struct client *cl = container_of(proc, struct client, dispatch.proc); 322 323 uh_relay_kill(cl, &proc->r); 324 } 325 326 bool uh_create_process(struct client *cl, struct path_info *pi, char *url, 327 void (*cb)(struct client *cl, struct path_info *pi, char *url)) 328 { 329 struct dispatch *d = &cl->dispatch; 330 struct dispatch_proc *proc = &d->proc; 331 int rfd[2], wfd[2]; 332 int pid; 333 334 blob_buf_init(&proc->hdr, 0); 335 proc->status_code = 200; 336 proc->status_msg = "OK"; 337 338 if (pipe(rfd)) 339 return false; 340 341 if (pipe(wfd)) 342 goto close_rfd; 343 344 pid = fork(); 345 if (pid < 0) 346 goto close_wfd; 347 348 if (!pid) { 349 close(0); 350 close(1); 351 352 dup2(rfd[1], 1); 353 dup2(wfd[0], 0); 354 355 close(rfd[0]); 356 close(rfd[1]); 357 close(wfd[0]); 358 close(wfd[1]); 359 360 uh_close_fds(); 361 cb(cl, pi, url); 362 exit(0); 363 } 364 365 close(rfd[1]); 366 close(wfd[0]); 367 368 proc->wrfd.fd = wfd[1]; 369 uh_relay_open(cl, &proc->r, rfd[0], pid); 370 371 d->free = proc_free; 372 d->close_fds = proc_close_fds; 373 d->data_send = proc_data_send; 374 d->data_done = proc_write_close; 375 d->write_cb = proc_relay_write_cb; 376 proc->r.header_cb = proc_handle_header; 377 proc->r.header_end = proc_handle_header_end; 378 proc->r.close = proc_handle_close; 379 proc->wrfd.cb = proc_write_cb; 380 proc->timeout.cb = proc_timeout_cb; 381 if (conf.script_timeout > 0) 382 uloop_timeout_set(&proc->timeout, conf.script_timeout * 1000); 383 384 return true; 385 386 close_wfd: 387 close(wfd[0]); 388 close(wfd[1]); 389 close_rfd: 390 close(rfd[0]); 391 close(rfd[1]); 392 393 return false; 394 } 395
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