server_fcgi.c revision 1.74
1/* $OpenBSD: server_fcgi.c,v 1.74 2017/01/21 11:32:04 guenther Exp $ */ 2 3/* 4 * Copyright (c) 2014 Florian Obser <florian@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19#include <sys/types.h> 20#include <sys/time.h> 21#include <sys/socket.h> 22#include <sys/un.h> 23 24#include <netinet/in.h> 25#include <arpa/inet.h> 26 27#include <limits.h> 28#include <errno.h> 29#include <stdlib.h> 30#include <string.h> 31#include <stdio.h> 32#include <time.h> 33#include <ctype.h> 34#include <event.h> 35#include <unistd.h> 36 37#include "httpd.h" 38#include "http.h" 39 40#define FCGI_PADDING_SIZE 255 41#define FCGI_RECORD_SIZE \ 42 (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE) 43 44#define FCGI_BEGIN_REQUEST 1 45#define FCGI_ABORT_REQUEST 2 46#define FCGI_END_REQUEST 3 47#define FCGI_PARAMS 4 48#define FCGI_STDIN 5 49#define FCGI_STDOUT 6 50#define FCGI_STDERR 7 51#define FCGI_DATA 8 52#define FCGI_GET_VALUES 9 53#define FCGI_GET_VALUES_RESULT 10 54#define FCGI_UNKNOWN_TYPE 11 55#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE) 56 57#define FCGI_RESPONDER 1 58 59struct fcgi_record_header { 60 uint8_t version; 61 uint8_t type; 62 uint16_t id; 63 uint16_t content_len; 64 uint8_t padding_len; 65 uint8_t reserved; 66} __packed; 67 68struct fcgi_begin_request_body { 69 uint16_t role; 70 uint8_t flags; 71 uint8_t reserved[5]; 72} __packed; 73 74struct server_fcgi_param { 75 int total_len; 76 uint8_t buf[FCGI_RECORD_SIZE]; 77}; 78 79int server_fcgi_header(struct client *, unsigned int); 80void server_fcgi_read(struct bufferevent *, void *); 81int server_fcgi_writeheader(struct client *, struct kv *, void *); 82int server_fcgi_writechunk(struct client *); 83int server_fcgi_getheaders(struct client *); 84int fcgi_add_param(struct server_fcgi_param *, const char *, const char *, 85 struct client *); 86 87int 88server_fcgi(struct httpd *env, struct client *clt) 89{ 90 struct server_fcgi_param param; 91 struct server_config *srv_conf = clt->clt_srv_conf; 92 struct http_descriptor *desc = clt->clt_descreq; 93 struct fcgi_record_header *h; 94 struct fcgi_begin_request_body *begin; 95 char hbuf[HOST_NAME_MAX+1]; 96 size_t scriptlen; 97 int pathlen; 98 int fd = -1, ret; 99 const char *stripped, *p, *alias, *errstr = NULL; 100 char *str, *script = NULL; 101 102 if (srv_conf->socket[0] == ':') { 103 struct sockaddr_storage ss; 104 in_port_t port; 105 106 p = srv_conf->socket + 1; 107 108 port = strtonum(p, 0, 0xffff, &errstr); 109 if (errstr != NULL) { 110 log_warn("%s: strtonum %s, %s", __func__, p, errstr); 111 goto fail; 112 } 113 memset(&ss, 0, sizeof(ss)); 114 ss.ss_family = AF_INET; 115 ((struct sockaddr_in *) 116 &ss)->sin_addr.s_addr = htonl(INADDR_LOOPBACK); 117 port = htons(port); 118 119 if ((fd = server_socket_connect(&ss, port, srv_conf)) == -1) 120 goto fail; 121 } else { 122 struct sockaddr_un sun; 123 124 if ((fd = socket(AF_UNIX, 125 SOCK_STREAM | SOCK_NONBLOCK, 0)) == -1) 126 goto fail; 127 128 memset(&sun, 0, sizeof(sun)); 129 sun.sun_family = AF_UNIX; 130 if (strlcpy(sun.sun_path, srv_conf->socket, 131 sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) { 132 errstr = "socket path to long"; 133 goto fail; 134 } 135 136 if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) 137 goto fail; 138 } 139 140 memset(hbuf, 0, sizeof(hbuf)); 141 clt->clt_fcgi.state = FCGI_READ_HEADER; 142 clt->clt_fcgi.toread = sizeof(struct fcgi_record_header); 143 clt->clt_fcgi.status = 200; 144 clt->clt_fcgi.headersdone = 0; 145 146 if (clt->clt_srvevb != NULL) 147 evbuffer_free(clt->clt_srvevb); 148 149 clt->clt_srvevb = evbuffer_new(); 150 if (clt->clt_srvevb == NULL) { 151 errstr = "failed to allocate evbuffer"; 152 goto fail; 153 } 154 155 close(clt->clt_fd); 156 clt->clt_fd = fd; 157 158 if (clt->clt_srvbev != NULL) 159 bufferevent_free(clt->clt_srvbev); 160 161 clt->clt_srvbev_throttled = 0; 162 clt->clt_srvbev = bufferevent_new(fd, server_fcgi_read, 163 NULL, server_file_error, clt); 164 if (clt->clt_srvbev == NULL) { 165 errstr = "failed to allocate fcgi buffer event"; 166 goto fail; 167 } 168 169 memset(¶m, 0, sizeof(param)); 170 171 h = (struct fcgi_record_header *)¶m.buf; 172 h->version = 1; 173 h->type = FCGI_BEGIN_REQUEST; 174 h->id = htons(1); 175 h->content_len = htons(sizeof(struct fcgi_begin_request_body)); 176 h->padding_len = 0; 177 178 begin = (struct fcgi_begin_request_body *)¶m.buf[sizeof(struct 179 fcgi_record_header)]; 180 begin->role = htons(FCGI_RESPONDER); 181 182 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 183 sizeof(struct fcgi_record_header) + 184 sizeof(struct fcgi_begin_request_body)) == -1) { 185 errstr = "failed to write to evbuffer"; 186 goto fail; 187 } 188 189 h->type = FCGI_PARAMS; 190 h->content_len = param.total_len = 0; 191 192 alias = desc->http_path_alias != NULL 193 ? desc->http_path_alias 194 : desc->http_path; 195 196 stripped = server_root_strip(alias, srv_conf->strip); 197 if ((pathlen = asprintf(&script, "%s%s", srv_conf->root, stripped)) 198 == -1) { 199 errstr = "failed to get script name"; 200 goto fail; 201 } 202 203 scriptlen = path_info(script); 204 /* 205 * no part of root should show up in PATH_INFO. 206 * therefore scriptlen should be >= strlen(root) 207 */ 208 if (scriptlen < strlen(srv_conf->root)) 209 scriptlen = strlen(srv_conf->root); 210 if ((int)scriptlen < pathlen) { 211 if (fcgi_add_param(¶m, "PATH_INFO", 212 script + scriptlen, clt) == -1) { 213 errstr = "failed to encode param"; 214 goto fail; 215 } 216 script[scriptlen] = '\0'; 217 } else { 218 /* RFC 3875 mandates that PATH_INFO is empty if not set */ 219 if (fcgi_add_param(¶m, "PATH_INFO", "", clt) == -1) { 220 errstr = "failed to encode param"; 221 goto fail; 222 } 223 } 224 225 /* 226 * calculate length of http SCRIPT_NAME: 227 * add length of stripped prefix, 228 * subtract length of prepended local root 229 */ 230 scriptlen += (stripped - alias) - strlen(srv_conf->root); 231 if ((str = strndup(alias, scriptlen)) == NULL) 232 goto fail; 233 ret = fcgi_add_param(¶m, "SCRIPT_NAME", str, clt); 234 free(str); 235 if (ret == -1) { 236 errstr = "failed to encode param"; 237 goto fail; 238 } 239 if (fcgi_add_param(¶m, "SCRIPT_FILENAME", script, clt) == -1) { 240 errstr = "failed to encode param"; 241 goto fail; 242 } 243 244 if (desc->http_query) { 245 if (fcgi_add_param(¶m, "QUERY_STRING", desc->http_query, 246 clt) == -1) { 247 errstr = "failed to encode param"; 248 goto fail; 249 } 250 } else if (fcgi_add_param(¶m, "QUERY_STRING", "", clt) == -1) { 251 errstr = "failed to encode param"; 252 goto fail; 253 } 254 255 if (fcgi_add_param(¶m, "DOCUMENT_ROOT", srv_conf->root, 256 clt) == -1) { 257 errstr = "failed to encode param"; 258 goto fail; 259 } 260 if (fcgi_add_param(¶m, "DOCUMENT_URI", alias, 261 clt) == -1) { 262 errstr = "failed to encode param"; 263 goto fail; 264 } 265 if (fcgi_add_param(¶m, "GATEWAY_INTERFACE", "CGI/1.1", 266 clt) == -1) { 267 errstr = "failed to encode param"; 268 goto fail; 269 } 270 271 if (srv_conf->flags & SRVFLAG_AUTH) { 272 if (fcgi_add_param(¶m, "REMOTE_USER", 273 clt->clt_remote_user, clt) == -1) { 274 errstr = "failed to encode param"; 275 goto fail; 276 } 277 } 278 279 /* Add HTTP_* headers */ 280 if (server_headers(clt, desc, server_fcgi_writeheader, ¶m) == -1) { 281 errstr = "failed to encode param"; 282 goto fail; 283 } 284 285 if (srv_conf->flags & SRVFLAG_TLS) 286 if (fcgi_add_param(¶m, "HTTPS", "on", clt) == -1) { 287 errstr = "failed to encode param"; 288 goto fail; 289 } 290 291 (void)print_host(&clt->clt_ss, hbuf, sizeof(hbuf)); 292 if (fcgi_add_param(¶m, "REMOTE_ADDR", hbuf, clt) == -1) { 293 errstr = "failed to encode param"; 294 goto fail; 295 } 296 297 (void)snprintf(hbuf, sizeof(hbuf), "%d", ntohs(clt->clt_port)); 298 if (fcgi_add_param(¶m, "REMOTE_PORT", hbuf, clt) == -1) { 299 errstr = "failed to encode param"; 300 goto fail; 301 } 302 303 if (fcgi_add_param(¶m, "REQUEST_METHOD", 304 server_httpmethod_byid(desc->http_method), clt) == -1) { 305 errstr = "failed to encode param"; 306 goto fail; 307 } 308 309 if (!desc->http_query) { 310 if (fcgi_add_param(¶m, "REQUEST_URI", desc->http_path, 311 clt) == -1) { 312 errstr = "failed to encode param"; 313 goto fail; 314 } 315 } else { 316 if (asprintf(&str, "%s?%s", desc->http_path, 317 desc->http_query) == -1) { 318 errstr = "failed to encode param"; 319 goto fail; 320 } 321 ret = fcgi_add_param(¶m, "REQUEST_URI", str, clt); 322 free(str); 323 if (ret == -1) { 324 errstr = "failed to encode param"; 325 goto fail; 326 } 327 } 328 329 (void)print_host(&clt->clt_srv_ss, hbuf, sizeof(hbuf)); 330 if (fcgi_add_param(¶m, "SERVER_ADDR", hbuf, clt) == -1) { 331 errstr = "failed to encode param"; 332 goto fail; 333 } 334 335 (void)snprintf(hbuf, sizeof(hbuf), "%d", 336 ntohs(server_socket_getport(&clt->clt_srv_ss))); 337 if (fcgi_add_param(¶m, "SERVER_PORT", hbuf, clt) == -1) { 338 errstr = "failed to encode param"; 339 goto fail; 340 } 341 342 if (fcgi_add_param(¶m, "SERVER_NAME", srv_conf->name, 343 clt) == -1) { 344 errstr = "failed to encode param"; 345 goto fail; 346 } 347 348 if (fcgi_add_param(¶m, "SERVER_PROTOCOL", desc->http_version, 349 clt) == -1) { 350 errstr = "failed to encode param"; 351 goto fail; 352 } 353 354 if (fcgi_add_param(¶m, "SERVER_SOFTWARE", HTTPD_SERVERNAME, 355 clt) == -1) { 356 errstr = "failed to encode param"; 357 goto fail; 358 } 359 360 if (param.total_len != 0) { /* send last params record */ 361 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 362 sizeof(struct fcgi_record_header) + 363 ntohs(h->content_len)) == -1) { 364 errstr = "failed to write to client evbuffer"; 365 goto fail; 366 } 367 } 368 369 /* send "no more params" message */ 370 h->content_len = 0; 371 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 372 sizeof(struct fcgi_record_header)) == -1) { 373 errstr = "failed to write to client evbuffer"; 374 goto fail; 375 } 376 377 bufferevent_settimeout(clt->clt_srvbev, 378 srv_conf->timeout.tv_sec, srv_conf->timeout.tv_sec); 379 bufferevent_enable(clt->clt_srvbev, EV_READ|EV_WRITE); 380 if (clt->clt_toread != 0) { 381 server_read_httpcontent(clt->clt_bev, clt); 382 bufferevent_enable(clt->clt_bev, EV_READ); 383 } else { 384 bufferevent_disable(clt->clt_bev, EV_READ); 385 fcgi_add_stdin(clt, NULL); 386 } 387 388 if (strcmp(desc->http_version, "HTTP/1.1") == 0) { 389 clt->clt_fcgi.chunked = 1; 390 } else { 391 /* HTTP/1.0 does not support chunked encoding */ 392 clt->clt_fcgi.chunked = 0; 393 clt->clt_persist = 0; 394 } 395 clt->clt_fcgi.end = 0; 396 clt->clt_done = 0; 397 398 free(script); 399 return (0); 400 fail: 401 free(script); 402 if (errstr == NULL) 403 errstr = strerror(errno); 404 if (fd != -1 && clt->clt_fd != fd) 405 close(fd); 406 server_abort_http(clt, 500, errstr); 407 return (-1); 408} 409 410int 411fcgi_add_stdin(struct client *clt, struct evbuffer *evbuf) 412{ 413 struct fcgi_record_header h; 414 415 memset(&h, 0, sizeof(h)); 416 h.version = 1; 417 h.type = FCGI_STDIN; 418 h.id = htons(1); 419 h.padding_len = 0; 420 421 if (evbuf == NULL) { 422 h.content_len = 0; 423 return bufferevent_write(clt->clt_srvbev, &h, 424 sizeof(struct fcgi_record_header)); 425 } else { 426 h.content_len = htons(EVBUFFER_LENGTH(evbuf)); 427 if (bufferevent_write(clt->clt_srvbev, &h, 428 sizeof(struct fcgi_record_header)) == -1) 429 return -1; 430 return bufferevent_write_buffer(clt->clt_srvbev, evbuf); 431 } 432 return (0); 433} 434 435int 436fcgi_add_param(struct server_fcgi_param *p, const char *key, 437 const char *val, struct client *clt) 438{ 439 struct fcgi_record_header *h; 440 int len = 0; 441 int key_len = strlen(key); 442 int val_len = strlen(val); 443 uint8_t *param; 444 445 len += key_len + val_len; 446 len += key_len > 127 ? 4 : 1; 447 len += val_len > 127 ? 4 : 1; 448 449 DPRINTF("%s: %s[%d] => %s[%d], total_len: %d", __func__, key, key_len, 450 val, val_len, p->total_len); 451 452 if (len > FCGI_CONTENT_SIZE) 453 return (-1); 454 455 if (p->total_len + len > FCGI_CONTENT_SIZE) { 456 if (bufferevent_write(clt->clt_srvbev, p->buf, 457 sizeof(struct fcgi_record_header) + p->total_len) == -1) 458 return (-1); 459 p->total_len = 0; 460 } 461 462 h = (struct fcgi_record_header *)p->buf; 463 param = p->buf + sizeof(*h) + p->total_len; 464 465 if (key_len > 127) { 466 *param++ = ((key_len >> 24) & 0xff) | 0x80; 467 *param++ = ((key_len >> 16) & 0xff); 468 *param++ = ((key_len >> 8) & 0xff); 469 *param++ = (key_len & 0xff); 470 } else 471 *param++ = key_len; 472 473 if (val_len > 127) { 474 *param++ = ((val_len >> 24) & 0xff) | 0x80; 475 *param++ = ((val_len >> 16) & 0xff); 476 *param++ = ((val_len >> 8) & 0xff); 477 *param++ = (val_len & 0xff); 478 } else 479 *param++ = val_len; 480 481 memcpy(param, key, key_len); 482 param += key_len; 483 memcpy(param, val, val_len); 484 485 p->total_len += len; 486 487 h->content_len = htons(p->total_len); 488 return (0); 489} 490 491void 492server_fcgi_read(struct bufferevent *bev, void *arg) 493{ 494 uint8_t buf[FCGI_RECORD_SIZE]; 495 struct client *clt = (struct client *) arg; 496 struct fcgi_record_header *h; 497 size_t len; 498 char *ptr; 499 500 do { 501 len = bufferevent_read(bev, buf, clt->clt_fcgi.toread); 502 if (evbuffer_add(clt->clt_srvevb, buf, len) == -1) { 503 server_abort_http(clt, 500, "short write"); 504 return; 505 } 506 clt->clt_fcgi.toread -= len; 507 DPRINTF("%s: len: %lu toread: %d state: %d type: %d", 508 __func__, len, clt->clt_fcgi.toread, 509 clt->clt_fcgi.state, clt->clt_fcgi.type); 510 511 if (clt->clt_fcgi.toread != 0) 512 return; 513 514 switch (clt->clt_fcgi.state) { 515 case FCGI_READ_HEADER: 516 clt->clt_fcgi.state = FCGI_READ_CONTENT; 517 h = (struct fcgi_record_header *) 518 EVBUFFER_DATA(clt->clt_srvevb); 519 DPRINTF("%s: record header: version %d type %d id %d " 520 "content len %d padding %d", __func__, 521 h->version, h->type, ntohs(h->id), 522 ntohs(h->content_len), h->padding_len); 523 clt->clt_fcgi.type = h->type; 524 clt->clt_fcgi.toread = ntohs(h->content_len); 525 clt->clt_fcgi.padding_len = h->padding_len; 526 evbuffer_drain(clt->clt_srvevb, 527 EVBUFFER_LENGTH(clt->clt_srvevb)); 528 if (clt->clt_fcgi.toread != 0) 529 break; 530 else if (clt->clt_fcgi.type == FCGI_STDOUT && 531 !clt->clt_chunk) { 532 server_abort_http(clt, 500, "empty stdout"); 533 return; 534 } 535 536 /* fallthrough if content_len == 0 */ 537 case FCGI_READ_CONTENT: 538 switch (clt->clt_fcgi.type) { 539 case FCGI_STDERR: 540 if (EVBUFFER_LENGTH(clt->clt_srvevb) > 0 && 541 (ptr = get_string( 542 EVBUFFER_DATA(clt->clt_srvevb), 543 EVBUFFER_LENGTH(clt->clt_srvevb))) 544 != NULL) { 545 server_sendlog(clt->clt_srv_conf, 546 IMSG_LOG_ERROR, "%s", ptr); 547 free(ptr); 548 } 549 break; 550 case FCGI_STDOUT: 551 ++clt->clt_chunk; 552 if (!clt->clt_fcgi.headersdone) { 553 clt->clt_fcgi.headersdone = 554 server_fcgi_getheaders(clt); 555 if (clt->clt_fcgi.headersdone) { 556 if (server_fcgi_header(clt, 557 clt->clt_fcgi.status) 558 == -1) { 559 server_abort_http(clt, 560 500, 561 "malformed fcgi " 562 "headers"); 563 return; 564 } 565 } 566 if (!EVBUFFER_LENGTH(clt->clt_srvevb)) 567 break; 568 } 569 /* FALLTHROUGH */ 570 case FCGI_END_REQUEST: 571 if (server_fcgi_writechunk(clt) == -1) { 572 server_abort_http(clt, 500, 573 "encoding error"); 574 return; 575 } 576 break; 577 } 578 evbuffer_drain(clt->clt_srvevb, 579 EVBUFFER_LENGTH(clt->clt_srvevb)); 580 if (!clt->clt_fcgi.padding_len) { 581 clt->clt_fcgi.state = FCGI_READ_HEADER; 582 clt->clt_fcgi.toread = 583 sizeof(struct fcgi_record_header); 584 } else { 585 clt->clt_fcgi.state = FCGI_READ_PADDING; 586 clt->clt_fcgi.toread = 587 clt->clt_fcgi.padding_len; 588 } 589 break; 590 case FCGI_READ_PADDING: 591 evbuffer_drain(clt->clt_srvevb, 592 EVBUFFER_LENGTH(clt->clt_srvevb)); 593 clt->clt_fcgi.state = FCGI_READ_HEADER; 594 clt->clt_fcgi.toread = 595 sizeof(struct fcgi_record_header); 596 break; 597 } 598 } while (len > 0); 599} 600 601int 602server_fcgi_header(struct client *clt, unsigned int code) 603{ 604 struct server_config *srv_conf = clt->clt_srv_conf; 605 struct http_descriptor *desc = clt->clt_descreq; 606 struct http_descriptor *resp = clt->clt_descresp; 607 const char *error; 608 char tmbuf[32]; 609 struct kv *kv, *cl, key; 610 611 if (desc == NULL || (error = server_httperror_byid(code)) == NULL) 612 return (-1); 613 614 if (server_log_http(clt, code, 0) == -1) 615 return (-1); 616 617 /* Add error codes */ 618 if (kv_setkey(&resp->http_pathquery, "%u", code) == -1 || 619 kv_set(&resp->http_pathquery, "%s", error) == -1) 620 return (-1); 621 622 /* Add headers */ 623 if (kv_add(&resp->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 624 return (-1); 625 626 /* Set chunked encoding */ 627 if (clt->clt_fcgi.chunked) { 628 /* XXX Should we keep and handle Content-Length instead? */ 629 key.kv_key = "Content-Length"; 630 if ((kv = kv_find(&resp->http_headers, &key)) != NULL) 631 kv_delete(&resp->http_headers, kv); 632 633 /* 634 * XXX What if the FastCGI added some kind of Transfer-Encoding? 635 * XXX like gzip, deflate or even "chunked"? 636 */ 637 if (kv_add(&resp->http_headers, 638 "Transfer-Encoding", "chunked") == NULL) 639 return (-1); 640 } 641 642 /* Is it a persistent connection? */ 643 if (clt->clt_persist) { 644 if (kv_add(&resp->http_headers, 645 "Connection", "keep-alive") == NULL) 646 return (-1); 647 } else if (kv_add(&resp->http_headers, "Connection", "close") == NULL) 648 return (-1); 649 650 /* HSTS header */ 651 if (srv_conf->flags & SRVFLAG_SERVER_HSTS) { 652 if ((cl = 653 kv_add(&resp->http_headers, "Strict-Transport-Security", 654 NULL)) == NULL || 655 kv_set(cl, "max-age=%d%s%s", srv_conf->hsts_max_age, 656 srv_conf->hsts_flags & HSTSFLAG_SUBDOMAINS ? 657 "; includeSubDomains" : "", 658 srv_conf->hsts_flags & HSTSFLAG_PRELOAD ? 659 "; preload" : "") == -1) 660 return (-1); 661 } 662 663 /* Date header is mandatory and should be added as late as possible */ 664 if (server_http_time(time(NULL), tmbuf, sizeof(tmbuf)) <= 0 || 665 kv_add(&resp->http_headers, "Date", tmbuf) == NULL) 666 return (-1); 667 668 /* Write initial header (fcgi might append more) */ 669 if (server_writeresponse_http(clt) == -1 || 670 server_bufferevent_print(clt, "\r\n") == -1 || 671 server_headers(clt, resp, server_writeheader_http, NULL) == -1 || 672 server_bufferevent_print(clt, "\r\n") == -1) 673 return (-1); 674 675 return (0); 676} 677 678int 679server_fcgi_writeheader(struct client *clt, struct kv *hdr, void *arg) 680{ 681 struct server_fcgi_param *param = arg; 682 char *val, *name, *p; 683 const char *key; 684 int ret; 685 686 if (hdr->kv_flags & KV_FLAG_INVALID) 687 return (0); 688 689 /* The key might have been updated in the parent */ 690 if (hdr->kv_parent != NULL && hdr->kv_parent->kv_key != NULL) 691 key = hdr->kv_parent->kv_key; 692 else 693 key = hdr->kv_key; 694 695 val = hdr->kv_value; 696 697 if (strcasecmp(key, "Content-Length") == 0 || 698 strcasecmp(key, "Content-Type") == 0) { 699 if ((name = strdup(key)) == NULL) 700 return (-1); 701 } else { 702 if (asprintf(&name, "HTTP_%s", key) == -1) 703 return (-1); 704 } 705 706 /* 707 * RFC 7230 defines a header field-name as a "token" and a "token" 708 * is defined as one or more characters for which isalpha or 709 * isdigit is true plus a list of additional characters. 710 * According to RFC 3875 a CGI environment variable is created 711 * by converting all letters to upper case and replacing '-' 712 * with '_'. 713 */ 714 for (p = name; *p != '\0'; p++) { 715 if (isalpha((unsigned char)*p)) 716 *p = toupper((unsigned char)*p); 717 else if (!(*p == '!' || *p == '#' || *p == '$' || *p == '%' || 718 *p == '&' || *p == '\'' || *p == '*' || *p == '+' || 719 *p == '.' || *p == '^' || *p == '_' || *p == '`' || 720 *p == '|' || *p == '~' || isdigit((unsigned char)*p))) 721 *p = '_'; 722 } 723 724 ret = fcgi_add_param(param, name, val, clt); 725 free(name); 726 727 return (ret); 728} 729 730int 731server_fcgi_writechunk(struct client *clt) 732{ 733 struct evbuffer *evb = clt->clt_srvevb; 734 size_t len; 735 736 if (clt->clt_fcgi.type == FCGI_END_REQUEST) { 737 len = 0; 738 } else 739 len = EVBUFFER_LENGTH(evb); 740 741 if (clt->clt_fcgi.chunked) { 742 /* If len is 0, make sure to write the end marker only once */ 743 if (len == 0 && clt->clt_fcgi.end++) 744 return (0); 745 if (server_bufferevent_printf(clt, "%zx\r\n", len) == -1 || 746 server_bufferevent_write_chunk(clt, evb, len) == -1 || 747 server_bufferevent_print(clt, "\r\n") == -1) 748 return (-1); 749 } else if (len) 750 return (server_bufferevent_write_buffer(clt, evb)); 751 752 return (0); 753} 754 755int 756server_fcgi_getheaders(struct client *clt) 757{ 758 struct http_descriptor *resp = clt->clt_descresp; 759 struct evbuffer *evb = clt->clt_srvevb; 760 int code, ret; 761 char *line, *key, *value; 762 const char *errstr; 763 764 while ((line = evbuffer_getline(evb)) != NULL && *line != '\0') { 765 key = line; 766 767 if ((value = strchr(key, ':')) == NULL) 768 break; 769 770 *value++ = '\0'; 771 value += strspn(value, " \t"); 772 773 DPRINTF("%s: %s: %s", __func__, key, value); 774 775 if (strcasecmp("Status", key) == 0) { 776 value[strcspn(value, " \t")] = '\0'; 777 code = (int)strtonum(value, 100, 600, &errstr); 778 if (errstr != NULL || server_httperror_byid( 779 code) == NULL) 780 code = 200; 781 clt->clt_fcgi.status = code; 782 } else { 783 (void)kv_add(&resp->http_headers, key, value); 784 } 785 free(line); 786 } 787 788 ret = (line != NULL && *line == '\0'); 789 790 free(line); 791 return ret; 792} 793