2 * Copyright (c) 2020-2022 Tracey Emery <tracey@traceyemery.net>
3 * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
4 * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
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.
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.
19 #include <arpa/inet.h>
20 #include <sys/queue.h>
21 #include <sys/socket.h>
22 #include <sys/types.h>
35 #include "got_error.h"
40 size_t fcgi_parse_record(uint8_t *, size_t, struct request *);
41 void fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
43 void fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
44 int fcgi_send_response(struct request *, int, const void *, size_t);
46 void dump_fcgi_record_header(const char *, struct fcgi_record_header *);
47 void dump_fcgi_begin_request_body(const char *,
48 struct fcgi_begin_request_body *);
49 void dump_fcgi_end_request_body(const char *,
50 struct fcgi_end_request_body *);
52 extern int cgi_inflight;
53 extern volatile int client_cnt;
56 fcgi_request(int fd, short events, void *arg)
58 struct request *c = arg;
62 n = read(fd, c->buf + c->buf_pos + c->buf_len,
63 FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
77 log_debug("closed connection");
86 * Parse the records as they are received. Per the FastCGI
87 * specification, the server need only receive the FastCGI
88 * parameter records in full; it is free to begin execution
89 * at that point, which is what happens here.
92 parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
97 } while (parsed > 0 && c->buf_len > 0);
99 /* Make space for further reads */
101 if (c->buf_len > 0) {
102 bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
107 fcgi_cleanup_request(c);
111 fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
113 struct fcgi_record_header *h;
115 if (n < sizeof(struct fcgi_record_header))
118 h = (struct fcgi_record_header*) buf;
120 dump_fcgi_record("", h);
122 if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
127 log_warn("wrong version");
130 case FCGI_BEGIN_REQUEST:
131 fcgi_parse_begin_request(buf +
132 sizeof(struct fcgi_record_header),
133 ntohs(h->content_len), c, ntohs(h->id));
136 fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
137 ntohs(h->content_len), c, ntohs(h->id));
140 case FCGI_ABORT_REQUEST:
141 if (c->sock->client_status != CLIENT_DISCONNECT &&
142 c->outbuf_len != 0) {
143 fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
147 fcgi_create_end_record(c);
148 fcgi_cleanup_request(c);
151 log_warn("unimplemented type %d", h->type);
155 return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
160 fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
161 struct request *c, uint16_t id)
163 /* XXX -- FCGI_CANT_MPX_CONN */
164 if (c->request_started) {
165 log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
169 if (n != sizeof(struct fcgi_begin_request_body)) {
170 log_warn("wrong size %d != %lu", n,
171 sizeof(struct fcgi_begin_request_body));
175 c->request_started = 1;
180 fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
182 uint32_t name_len, val_len;
185 if (!c->request_started) {
186 log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
191 log_warn("unexpected id, ignoring");
196 gotweb_process_request(c);
201 if (buf[0] >> 7 == 0) {
207 name_len = ((buf[0] & 0x7f) << 24) +
208 (buf[1] << 16) + (buf[2] << 8) + buf[3];
218 if (buf[0] >> 7 == 0) {
224 val_len = ((buf[0] & 0x7f) << 24) +
225 (buf[1] << 16) + (buf[2] << 8) +
233 if (n < name_len + val_len)
236 val = buf + name_len;
238 if (c->querystring[0] == '\0' &&
239 val_len < MAX_QUERYSTRING &&
241 strncmp(buf, "QUERY_STRING", 12) == 0) {
242 memcpy(c->querystring, val, val_len);
243 c->querystring[val_len] = '\0';
246 if (c->http_host[0] == '\0' &&
247 val_len < GOTWEBD_MAXTEXT &&
249 strncmp(buf, "HTTP_HOST", 9) == 0) {
250 memcpy(c->http_host, val, val_len);
251 c->http_host[val_len] = '\0';
254 * lazily get subdomain
255 * will only get domain if no subdomain exists
256 * this can still work if gotweb server name is the same
258 sd = strchr(c->http_host, '.');
263 if (c->script_name[0] == '\0' &&
264 val_len < MAX_SCRIPT_NAME &&
266 strncmp(buf, "SCRIPT_NAME", 11) == 0) {
267 memcpy(c->script_name, val, val_len);
268 c->script_name[val_len] = '\0';
271 if (c->server_name[0] == '\0' &&
272 val_len < MAX_SERVER_NAME &&
274 strncmp(buf, "SERVER_NAME", 11) == 0) {
275 memcpy(c->server_name, val, val_len);
276 c->server_name[val_len] = '\0';
279 buf += name_len + val_len;
280 n -= name_len - val_len;
285 fcgi_timeout(int fd, short events, void *arg)
287 fcgi_cleanup_request((struct request*) arg);
291 fcgi_printf(struct request *c, const char *fmt, ...)
298 r = vasprintf(&str, fmt, ap);
302 log_warn("%s: asprintf", __func__);
306 r = fcgi_gen_binary_response(c, str, r);
312 fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
316 if (c->sock->client_status == CLIENT_DISCONNECT)
319 if (data == NULL || len == 0)
323 * special case: send big replies -like blobs- directly
326 if (len > sizeof(c->outbuf)) {
327 if (c->outbuf_len > 0) {
328 fcgi_send_response(c, FCGI_STDOUT,
329 c->outbuf, c->outbuf_len);
332 return fcgi_send_response(c, FCGI_STDOUT, data, len);
335 if (len < sizeof(c->outbuf) - c->outbuf_len) {
336 memcpy(c->outbuf + c->outbuf_len, data, len);
337 c->outbuf_len += len;
341 r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
345 memcpy(c->outbuf, data, len);
351 send_response(struct request *c, int type, const uint8_t *data,
354 static const uint8_t padding[FCGI_PADDING_SIZE];
355 struct fcgi_record_header header;
359 size_t padded_len, tot;
360 int i, err = 0, th = 2000;
365 memset(&header, 0, sizeof(header));
368 header.id = htons(c->id);
369 header.content_len = htons(len);
371 /* The FastCGI spec suggests to align the output buffer */
372 tot = sizeof(header) + len;
373 padded_len = FCGI_ALIGN(tot);
374 if (padded_len > tot) {
375 header.padding_len = padded_len - tot;
376 tot += header.padding_len;
379 iov[0].iov_base = &header;
380 iov[0].iov_len = sizeof(header);
382 iov[1].iov_base = (void *)data;
383 iov[1].iov_len = len;
385 iov[2].iov_base = (void *)padding;
386 iov[2].iov_len = header.padding_len;
388 dump_fcgi_record("resp ", &header);
391 * XXX: add some simple write heuristics here
392 * On slower VMs, spotty connections, etc., we don't want to go right to
393 * disconnect. Let's at least try to write the data a few times before
397 nw = writev(c->fd, iov, nitems(iov));
399 c->sock->client_status = CLIENT_DISCONNECT;
404 if (errno == EAGAIN && err < th) {
405 nanosleep(&ts, NULL);
408 log_warn("%s: write failure", __func__);
409 c->sock->client_status = CLIENT_DISCONNECT;
414 log_debug("%s: partial write: %zu vs %zu", __func__,
418 for (i = 0; i < nitems(iov); ++i) {
419 if (nw < iov[i].iov_len) {
420 iov[i].iov_base += nw;
421 iov[i].iov_len -= nw;
424 nw -= iov[i].iov_len;
433 fcgi_send_response(struct request *c, int type, const void *data,
436 if (c->sock->client_status == CLIENT_DISCONNECT)
439 while (len > FCGI_CONTENT_SIZE) {
440 if (send_response(c, type, data, len) == -1)
443 data += FCGI_CONTENT_SIZE;
444 len -= FCGI_CONTENT_SIZE;
450 return send_response(c, type, data, len);
454 fcgi_create_end_record(struct request *c)
456 struct fcgi_end_request_body end_request;
458 memset(&end_request, 0, sizeof(end_request));
459 end_request.app_status = htonl(0); /* script status */
460 end_request.protocol_status = FCGI_REQUEST_COMPLETE;
462 fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
463 sizeof(end_request));
467 fcgi_cleanup_request(struct request *c)
472 evtimer_del(&c->tmo);
473 if (event_initialized(&c->ev))
477 gotweb_free_transport(c->t);
482 dump_fcgi_record(const char *p, struct fcgi_record_header *h)
484 dump_fcgi_record_header(p, h);
486 if (h->type == FCGI_BEGIN_REQUEST)
487 dump_fcgi_begin_request_body(p,
488 (struct fcgi_begin_request_body *)(h + 1));
489 else if (h->type == FCGI_END_REQUEST)
490 dump_fcgi_end_request_body(p,
491 (struct fcgi_end_request_body *)(h + 1));
495 dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
497 log_debug("%sversion: %d", p, h->version);
498 log_debug("%stype: %d", p, h->type);
499 log_debug("%srequestId: %d", p, ntohs(h->id));
500 log_debug("%scontentLength: %d", p, ntohs(h->content_len));
501 log_debug("%spaddingLength: %d", p, h->padding_len);
502 log_debug("%sreserved: %d", p, h->reserved);
506 dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
508 log_debug("%srole %d", p, ntohs(b->role));
509 log_debug("%sflags %d", p, b->flags);
513 dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
515 log_debug("%sappStatus: %d", p, ntohl(b->app_status));
516 log_debug("%sprotocolStatus: %d", p, b->protocol_status);