1 a596b957 2022-07-14 tracey /*
  2 a596b957 2022-07-14 tracey  * Copyright (c) 2020-2022 Tracey Emery <tracey@traceyemery.net>
  3 a596b957 2022-07-14 tracey  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
  4 a596b957 2022-07-14 tracey  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
  5 a596b957 2022-07-14 tracey  *
  6 a596b957 2022-07-14 tracey  * Permission to use, copy, modify, and distribute this software for any
  7 a596b957 2022-07-14 tracey  * purpose with or without fee is hereby granted, provided that the above
  8 a596b957 2022-07-14 tracey  * copyright notice and this permission notice appear in all copies.
  9 a596b957 2022-07-14 tracey  *
 10 a596b957 2022-07-14 tracey  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11 a596b957 2022-07-14 tracey  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12 a596b957 2022-07-14 tracey  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13 a596b957 2022-07-14 tracey  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14 a596b957 2022-07-14 tracey  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15 a596b957 2022-07-14 tracey  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16 a596b957 2022-07-14 tracey  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17 a596b957 2022-07-14 tracey  */
 18 a596b957 2022-07-14 tracey 
 19 a596b957 2022-07-14 tracey #include <arpa/inet.h>
 20 a596b957 2022-07-14 tracey #include <sys/queue.h>
 21 a596b957 2022-07-14 tracey #include <sys/socket.h>
 22 a596b957 2022-07-14 tracey #include <sys/types.h>
 23 311b7e33 2022-08-01 op #include <sys/uio.h>
 24 a596b957 2022-07-14 tracey 
 25 a596b957 2022-07-14 tracey #include <errno.h>
 26 a596b957 2022-07-14 tracey #include <event.h>
 27 a596b957 2022-07-14 tracey #include <imsg.h>
 28 01498c42 2022-08-19 op #include <stdarg.h>
 29 a596b957 2022-07-14 tracey #include <stdlib.h>
 30 a596b957 2022-07-14 tracey #include <stdio.h>
 31 a596b957 2022-07-14 tracey #include <string.h>
 32 a596b957 2022-07-14 tracey #include <time.h>
 33 a596b957 2022-07-14 tracey #include <unistd.h>
 34 a596b957 2022-07-14 tracey 
 35 a596b957 2022-07-14 tracey #include "got_error.h"
 36 df2d3cd2 2023-03-11 op #include "got_reference.h"
 37 a596b957 2022-07-14 tracey 
 38 a596b957 2022-07-14 tracey #include "proc.h"
 39 a596b957 2022-07-14 tracey #include "gotwebd.h"
 40 ed619ca0 2022-12-14 op #include "tmpl.h"
 41 a596b957 2022-07-14 tracey 
 42 a596b957 2022-07-14 tracey size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 43 a596b957 2022-07-14 tracey void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 44 a596b957 2022-07-14 tracey 	    uint16_t);
 45 a596b957 2022-07-14 tracey void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 46 3ff00ead 2022-08-09 op int	 fcgi_send_response(struct request *, int, const void *, size_t);
 47 a596b957 2022-07-14 tracey 
 48 a596b957 2022-07-14 tracey void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 49 a596b957 2022-07-14 tracey void	 dump_fcgi_begin_request_body(const char *,
 50 a596b957 2022-07-14 tracey 	    struct fcgi_begin_request_body *);
 51 a596b957 2022-07-14 tracey void	 dump_fcgi_end_request_body(const char *,
 52 a596b957 2022-07-14 tracey 	    struct fcgi_end_request_body *);
 53 a596b957 2022-07-14 tracey 
 54 a596b957 2022-07-14 tracey extern int	 cgi_inflight;
 55 a596b957 2022-07-14 tracey extern volatile int client_cnt;
 56 a596b957 2022-07-14 tracey 
 57 a596b957 2022-07-14 tracey void
 58 a596b957 2022-07-14 tracey fcgi_request(int fd, short events, void *arg)
 59 a596b957 2022-07-14 tracey {
 60 a596b957 2022-07-14 tracey 	struct request *c = arg;
 61 a596b957 2022-07-14 tracey 	ssize_t n;
 62 a596b957 2022-07-14 tracey 	size_t parsed = 0;
 63 a596b957 2022-07-14 tracey 
 64 a596b957 2022-07-14 tracey 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 65 a596b957 2022-07-14 tracey 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 66 a596b957 2022-07-14 tracey 
 67 a596b957 2022-07-14 tracey 	switch (n) {
 68 a596b957 2022-07-14 tracey 	case -1:
 69 a596b957 2022-07-14 tracey 		switch (errno) {
 70 a596b957 2022-07-14 tracey 		case EINTR:
 71 a596b957 2022-07-14 tracey 		case EAGAIN:
 72 a596b957 2022-07-14 tracey 			return;
 73 a596b957 2022-07-14 tracey 		default:
 74 a596b957 2022-07-14 tracey 			goto fail;
 75 a596b957 2022-07-14 tracey 		}
 76 a596b957 2022-07-14 tracey 		break;
 77 a596b957 2022-07-14 tracey 
 78 a596b957 2022-07-14 tracey 	case 0:
 79 a596b957 2022-07-14 tracey 		log_debug("closed connection");
 80 a596b957 2022-07-14 tracey 		goto fail;
 81 a596b957 2022-07-14 tracey 	default:
 82 a596b957 2022-07-14 tracey 		break;
 83 a596b957 2022-07-14 tracey 	}
 84 a596b957 2022-07-14 tracey 
 85 a596b957 2022-07-14 tracey 	c->buf_len += n;
 86 a596b957 2022-07-14 tracey 
 87 a596b957 2022-07-14 tracey 	/*
 88 a596b957 2022-07-14 tracey 	 * Parse the records as they are received. Per the FastCGI
 89 a596b957 2022-07-14 tracey 	 * specification, the server need only receive the FastCGI
 90 a596b957 2022-07-14 tracey 	 * parameter records in full; it is free to begin execution
 91 a596b957 2022-07-14 tracey 	 * at that point, which is what happens here.
 92 a596b957 2022-07-14 tracey 	 */
 93 a596b957 2022-07-14 tracey 	do {
 94 a596b957 2022-07-14 tracey 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 95 a596b957 2022-07-14 tracey 		if (parsed != 0) {
 96 a596b957 2022-07-14 tracey 			c->buf_pos += parsed;
 97 a596b957 2022-07-14 tracey 			c->buf_len -= parsed;
 98 a596b957 2022-07-14 tracey 		}
 99 a596b957 2022-07-14 tracey 
100 5add7f42 2023-03-10 op 		/* drop the parsed record */
101 5add7f42 2023-03-10 op 		if (parsed != 0 && c->buf_len > 0) {
102 a596b957 2022-07-14 tracey 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
103 a596b957 2022-07-14 tracey 			c->buf_pos = 0;
104 a596b957 2022-07-14 tracey 		}
105 5add7f42 2023-03-10 op 	} while (parsed > 0 && c->buf_len > 0);
106 5add7f42 2023-03-10 op 
107 a596b957 2022-07-14 tracey 	return;
108 a596b957 2022-07-14 tracey fail:
109 a596b957 2022-07-14 tracey 	fcgi_cleanup_request(c);
110 a596b957 2022-07-14 tracey }
111 a596b957 2022-07-14 tracey 
112 a596b957 2022-07-14 tracey size_t
113 a596b957 2022-07-14 tracey fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
114 a596b957 2022-07-14 tracey {
115 a596b957 2022-07-14 tracey 	struct fcgi_record_header *h;
116 a596b957 2022-07-14 tracey 
117 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header))
118 a596b957 2022-07-14 tracey 		 return 0;
119 a596b957 2022-07-14 tracey 
120 a596b957 2022-07-14 tracey 	h = (struct fcgi_record_header*) buf;
121 a596b957 2022-07-14 tracey 
122 a596b957 2022-07-14 tracey 	dump_fcgi_record("", h);
123 a596b957 2022-07-14 tracey 
124 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
125 a596b957 2022-07-14 tracey 	    + h->padding_len)
126 a596b957 2022-07-14 tracey 		 return 0;
127 a596b957 2022-07-14 tracey 
128 a596b957 2022-07-14 tracey 	if (h->version != 1)
129 a596b957 2022-07-14 tracey 		log_warn("wrong version");
130 a596b957 2022-07-14 tracey 
131 a596b957 2022-07-14 tracey 	switch (h->type) {
132 a596b957 2022-07-14 tracey 	case FCGI_BEGIN_REQUEST:
133 a596b957 2022-07-14 tracey 		fcgi_parse_begin_request(buf +
134 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_record_header),
135 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
136 a596b957 2022-07-14 tracey 		break;
137 a596b957 2022-07-14 tracey 	case FCGI_PARAMS:
138 a596b957 2022-07-14 tracey 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
139 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
140 a596b957 2022-07-14 tracey 		break;
141 a596b957 2022-07-14 tracey 	case FCGI_STDIN:
142 a596b957 2022-07-14 tracey 	case FCGI_ABORT_REQUEST:
143 3ff00ead 2022-08-09 op 		if (c->sock->client_status != CLIENT_DISCONNECT &&
144 3ff00ead 2022-08-09 op 		    c->outbuf_len != 0) {
145 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
146 3ff00ead 2022-08-09 op 			    c->outbuf_len);
147 3ff00ead 2022-08-09 op 		}
148 3ff00ead 2022-08-09 op 
149 a596b957 2022-07-14 tracey 		fcgi_create_end_record(c);
150 a596b957 2022-07-14 tracey 		fcgi_cleanup_request(c);
151 a596b957 2022-07-14 tracey 		return 0;
152 a596b957 2022-07-14 tracey 	default:
153 a596b957 2022-07-14 tracey 		log_warn("unimplemented type %d", h->type);
154 a596b957 2022-07-14 tracey 		break;
155 a596b957 2022-07-14 tracey 	}
156 a596b957 2022-07-14 tracey 
157 a596b957 2022-07-14 tracey 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
158 a596b957 2022-07-14 tracey 	    + h->padding_len);
159 a596b957 2022-07-14 tracey }
160 a596b957 2022-07-14 tracey 
161 a596b957 2022-07-14 tracey void
162 a596b957 2022-07-14 tracey fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
163 a596b957 2022-07-14 tracey     struct request *c, uint16_t id)
164 a596b957 2022-07-14 tracey {
165 a596b957 2022-07-14 tracey 	/* XXX -- FCGI_CANT_MPX_CONN */
166 a596b957 2022-07-14 tracey 	if (c->request_started) {
167 a596b957 2022-07-14 tracey 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
168 a596b957 2022-07-14 tracey 		return;
169 a596b957 2022-07-14 tracey 	}
170 a596b957 2022-07-14 tracey 
171 a596b957 2022-07-14 tracey 	if (n != sizeof(struct fcgi_begin_request_body)) {
172 a596b957 2022-07-14 tracey 		log_warn("wrong size %d != %lu", n,
173 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_begin_request_body));
174 a596b957 2022-07-14 tracey 		return;
175 a596b957 2022-07-14 tracey 	}
176 a596b957 2022-07-14 tracey 
177 a596b957 2022-07-14 tracey 	c->request_started = 1;
178 a596b957 2022-07-14 tracey 	c->id = id;
179 a596b957 2022-07-14 tracey }
180 a596b957 2022-07-14 tracey 
181 a596b957 2022-07-14 tracey void
182 a596b957 2022-07-14 tracey fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
183 a596b957 2022-07-14 tracey {
184 a596b957 2022-07-14 tracey 	uint32_t name_len, val_len;
185 c8af7691 2023-06-22 op 	uint8_t *val;
186 a596b957 2022-07-14 tracey 
187 a596b957 2022-07-14 tracey 	if (!c->request_started) {
188 a596b957 2022-07-14 tracey 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
189 a596b957 2022-07-14 tracey 		return;
190 a596b957 2022-07-14 tracey 	}
191 a596b957 2022-07-14 tracey 
192 a596b957 2022-07-14 tracey 	if (c->id != id) {
193 a596b957 2022-07-14 tracey 		log_warn("unexpected id, ignoring");
194 a596b957 2022-07-14 tracey 		return;
195 a596b957 2022-07-14 tracey 	}
196 a596b957 2022-07-14 tracey 
197 a596b957 2022-07-14 tracey 	if (n == 0) {
198 a596b957 2022-07-14 tracey 		gotweb_process_request(c);
199 a596b957 2022-07-14 tracey 		return;
200 a596b957 2022-07-14 tracey 	}
201 a596b957 2022-07-14 tracey 
202 a596b957 2022-07-14 tracey 	while (n > 0) {
203 a596b957 2022-07-14 tracey 		if (buf[0] >> 7 == 0) {
204 a596b957 2022-07-14 tracey 			name_len = buf[0];
205 a596b957 2022-07-14 tracey 			n--;
206 a596b957 2022-07-14 tracey 			buf++;
207 a596b957 2022-07-14 tracey 		} else {
208 a596b957 2022-07-14 tracey 			if (n > 3) {
209 a596b957 2022-07-14 tracey 				name_len = ((buf[0] & 0x7f) << 24) +
210 a596b957 2022-07-14 tracey 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
211 a596b957 2022-07-14 tracey 				n -= 4;
212 a596b957 2022-07-14 tracey 				buf += 4;
213 a596b957 2022-07-14 tracey 			} else
214 a596b957 2022-07-14 tracey 				return;
215 a596b957 2022-07-14 tracey 		}
216 a596b957 2022-07-14 tracey 
217 40a95f4f 2022-09-01 op 		if (n == 0)
218 a596b957 2022-07-14 tracey 			return;
219 a596b957 2022-07-14 tracey 
220 40a95f4f 2022-09-01 op 		if (buf[0] >> 7 == 0) {
221 40a95f4f 2022-09-01 op 			val_len = buf[0];
222 40a95f4f 2022-09-01 op 			n--;
223 40a95f4f 2022-09-01 op 			buf++;
224 40a95f4f 2022-09-01 op 		} else {
225 40a95f4f 2022-09-01 op 			if (n > 3) {
226 40a95f4f 2022-09-01 op 				val_len = ((buf[0] & 0x7f) << 24) +
227 40a95f4f 2022-09-01 op 					(buf[1] << 16) + (buf[2] << 8) +
228 40a95f4f 2022-09-01 op 					buf[3];
229 40a95f4f 2022-09-01 op 				n -= 4;
230 40a95f4f 2022-09-01 op 				buf += 4;
231 40a95f4f 2022-09-01 op 			} else
232 40a95f4f 2022-09-01 op 				return;
233 a596b957 2022-07-14 tracey 		}
234 a596b957 2022-07-14 tracey 
235 40a95f4f 2022-09-01 op 		if (n < name_len + val_len)
236 a596b957 2022-07-14 tracey 			return;
237 a596b957 2022-07-14 tracey 
238 40a95f4f 2022-09-01 op 		val = buf + name_len;
239 a596b957 2022-07-14 tracey 
240 40a95f4f 2022-09-01 op 		if (c->querystring[0] == '\0' &&
241 40a95f4f 2022-09-01 op 		    val_len < MAX_QUERYSTRING &&
242 40a95f4f 2022-09-01 op 		    name_len == 12 &&
243 40a95f4f 2022-09-01 op 		    strncmp(buf, "QUERY_STRING", 12) == 0) {
244 40a95f4f 2022-09-01 op 			memcpy(c->querystring, val, val_len);
245 a596b957 2022-07-14 tracey 			c->querystring[val_len] = '\0';
246 a596b957 2022-07-14 tracey 		}
247 a596b957 2022-07-14 tracey 
248 d19d9fce 2022-12-20 op 		if (c->document_uri[0] == '\0' &&
249 d19d9fce 2022-12-20 op 		    val_len < MAX_DOCUMENT_URI &&
250 d19d9fce 2022-12-20 op 		    name_len == 12 &&
251 d19d9fce 2022-12-20 op 		    strncmp(buf, "DOCUMENT_URI", 12) == 0) {
252 d19d9fce 2022-12-20 op 			memcpy(c->document_uri, val, val_len);
253 d19d9fce 2022-12-20 op 			c->document_uri[val_len] = '\0';
254 a596b957 2022-07-14 tracey 		}
255 40a95f4f 2022-09-01 op 
256 40a95f4f 2022-09-01 op 		if (c->server_name[0] == '\0' &&
257 40a95f4f 2022-09-01 op 		    val_len < MAX_SERVER_NAME &&
258 40a95f4f 2022-09-01 op 		    name_len == 11 &&
259 40a95f4f 2022-09-01 op 		    strncmp(buf, "SERVER_NAME", 11) == 0) {
260 40a95f4f 2022-09-01 op 			memcpy(c->server_name, val, val_len);
261 a596b957 2022-07-14 tracey 			c->server_name[val_len] = '\0';
262 a596b957 2022-07-14 tracey 		}
263 1abb18e1 2022-12-20 op 
264 1abb18e1 2022-12-20 op 		if (name_len == 5 &&
265 1abb18e1 2022-12-20 op 		    strncmp(buf, "HTTPS", 5) == 0)
266 1abb18e1 2022-12-20 op 			c->https = 1;
267 a596b957 2022-07-14 tracey 
268 40a95f4f 2022-09-01 op 		buf += name_len + val_len;
269 40a95f4f 2022-09-01 op 		n -= name_len - val_len;
270 a596b957 2022-07-14 tracey 	}
271 a596b957 2022-07-14 tracey }
272 a596b957 2022-07-14 tracey 
273 a596b957 2022-07-14 tracey void
274 a596b957 2022-07-14 tracey fcgi_timeout(int fd, short events, void *arg)
275 a596b957 2022-07-14 tracey {
276 a596b957 2022-07-14 tracey 	fcgi_cleanup_request((struct request*) arg);
277 01498c42 2022-08-19 op }
278 01498c42 2022-08-19 op 
279 01498c42 2022-08-19 op int
280 ed619ca0 2022-12-14 op fcgi_puts(struct template *tp, const char *str)
281 ed619ca0 2022-12-14 op {
282 ed619ca0 2022-12-14 op 	if (str == NULL)
283 ed619ca0 2022-12-14 op 		return 0;
284 ed619ca0 2022-12-14 op 	return fcgi_gen_binary_response(tp->tp_arg, str, strlen(str));
285 ed619ca0 2022-12-14 op }
286 ed619ca0 2022-12-14 op 
287 ed619ca0 2022-12-14 op int
288 ed619ca0 2022-12-14 op fcgi_putc(struct template *tp, int ch)
289 ed619ca0 2022-12-14 op {
290 ed619ca0 2022-12-14 op 	uint8_t c = ch;
291 ed619ca0 2022-12-14 op 	return fcgi_gen_binary_response(tp->tp_arg, &c, 1);
292 ed619ca0 2022-12-14 op }
293 ed619ca0 2022-12-14 op 
294 ed619ca0 2022-12-14 op int
295 8d02314f 2022-09-07 op fcgi_vprintf(struct request *c, const char *fmt, va_list ap)
296 01498c42 2022-08-19 op {
297 01498c42 2022-08-19 op 	char *str;
298 01498c42 2022-08-19 op 	int r;
299 01498c42 2022-08-19 op 
300 01498c42 2022-08-19 op 	r = vasprintf(&str, fmt, ap);
301 01498c42 2022-08-19 op 	if (r == -1) {
302 01498c42 2022-08-19 op 		log_warn("%s: asprintf", __func__);
303 01498c42 2022-08-19 op 		return -1;
304 01498c42 2022-08-19 op 	}
305 01498c42 2022-08-19 op 
306 01498c42 2022-08-19 op 	r = fcgi_gen_binary_response(c, str, r);
307 01498c42 2022-08-19 op 	free(str);
308 01498c42 2022-08-19 op 	return r;
309 a596b957 2022-07-14 tracey }
310 a596b957 2022-07-14 tracey 
311 a596b957 2022-07-14 tracey int
312 8d02314f 2022-09-07 op fcgi_printf(struct request *c, const char *fmt, ...)
313 8d02314f 2022-09-07 op {
314 8d02314f 2022-09-07 op 	va_list ap;
315 8d02314f 2022-09-07 op 	int r;
316 8d02314f 2022-09-07 op 
317 8d02314f 2022-09-07 op 	va_start(ap, fmt);
318 8d02314f 2022-09-07 op 	r = fcgi_vprintf(c, fmt, ap);
319 8d02314f 2022-09-07 op 	va_end(ap);
320 8d02314f 2022-09-07 op 
321 8d02314f 2022-09-07 op 	return r;
322 8d02314f 2022-09-07 op }
323 8d02314f 2022-09-07 op 
324 8d02314f 2022-09-07 op int
325 a596b957 2022-07-14 tracey fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
326 a596b957 2022-07-14 tracey {
327 3ff00ead 2022-08-09 op 	int r;
328 3ff00ead 2022-08-09 op 
329 a596b957 2022-07-14 tracey 	if (c->sock->client_status == CLIENT_DISCONNECT)
330 a596b957 2022-07-14 tracey 		return -1;
331 a596b957 2022-07-14 tracey 
332 9dd0e5e9 2022-07-28 op 	if (data == NULL || len == 0)
333 a596b957 2022-07-14 tracey 		return 0;
334 a596b957 2022-07-14 tracey 
335 3ff00ead 2022-08-09 op 	/*
336 3ff00ead 2022-08-09 op 	 * special case: send big replies -like blobs- directly
337 3ff00ead 2022-08-09 op 	 * without copying.
338 3ff00ead 2022-08-09 op 	 */
339 3ff00ead 2022-08-09 op 	if (len > sizeof(c->outbuf)) {
340 3ff00ead 2022-08-09 op 		if (c->outbuf_len > 0) {
341 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT,
342 3ff00ead 2022-08-09 op 			    c->outbuf, c->outbuf_len);
343 3ff00ead 2022-08-09 op 			c->outbuf_len = 0;
344 3ff00ead 2022-08-09 op 		}
345 3ff00ead 2022-08-09 op 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
346 3ff00ead 2022-08-09 op 	}
347 3ff00ead 2022-08-09 op 
348 3ff00ead 2022-08-09 op 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
349 3ff00ead 2022-08-09 op 		memcpy(c->outbuf + c->outbuf_len, data, len);
350 3ff00ead 2022-08-09 op 		c->outbuf_len += len;
351 3ff00ead 2022-08-09 op 		return 0;
352 3ff00ead 2022-08-09 op 	}
353 3ff00ead 2022-08-09 op 
354 3ff00ead 2022-08-09 op 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
355 3ff00ead 2022-08-09 op 	if (r == -1)
356 3ff00ead 2022-08-09 op 		return -1;
357 3ff00ead 2022-08-09 op 
358 3ff00ead 2022-08-09 op 	memcpy(c->outbuf, data, len);
359 3ff00ead 2022-08-09 op 	c->outbuf_len = len;
360 a596b957 2022-07-14 tracey 	return 0;
361 a596b957 2022-07-14 tracey }
362 a596b957 2022-07-14 tracey 
363 3ff00ead 2022-08-09 op static int
364 311b7e33 2022-08-01 op send_response(struct request *c, int type, const uint8_t *data,
365 311b7e33 2022-08-01 op     size_t len)
366 a596b957 2022-07-14 tracey {
367 311b7e33 2022-08-01 op 	static const uint8_t padding[FCGI_PADDING_SIZE];
368 311b7e33 2022-08-01 op 	struct fcgi_record_header header;
369 311b7e33 2022-08-01 op 	struct iovec iov[3];
370 a596b957 2022-07-14 tracey 	struct timespec ts;
371 cb8b8986 2022-07-28 op 	ssize_t nw;
372 311b7e33 2022-08-01 op 	size_t padded_len, tot;
373 311b7e33 2022-08-01 op 	int i, err = 0, th = 2000;
374 a596b957 2022-07-14 tracey 
375 a596b957 2022-07-14 tracey 	ts.tv_sec = 0;
376 a596b957 2022-07-14 tracey 	ts.tv_nsec = 50;
377 a596b957 2022-07-14 tracey 
378 311b7e33 2022-08-01 op 	memset(&header, 0, sizeof(header));
379 311b7e33 2022-08-01 op 	header.version = 1;
380 311b7e33 2022-08-01 op 	header.type = type;
381 311b7e33 2022-08-01 op 	header.id = htons(c->id);
382 311b7e33 2022-08-01 op 	header.content_len = htons(len);
383 a596b957 2022-07-14 tracey 
384 a596b957 2022-07-14 tracey 	/* The FastCGI spec suggests to align the output buffer */
385 311b7e33 2022-08-01 op 	tot = sizeof(header) + len;
386 311b7e33 2022-08-01 op 	padded_len = FCGI_ALIGN(tot);
387 311b7e33 2022-08-01 op 	if (padded_len > tot) {
388 311b7e33 2022-08-01 op 		header.padding_len = padded_len - tot;
389 311b7e33 2022-08-01 op 		tot += header.padding_len;
390 a596b957 2022-07-14 tracey 	}
391 a596b957 2022-07-14 tracey 
392 311b7e33 2022-08-01 op 	iov[0].iov_base = &header;
393 311b7e33 2022-08-01 op 	iov[0].iov_len = sizeof(header);
394 a596b957 2022-07-14 tracey 
395 311b7e33 2022-08-01 op 	iov[1].iov_base = (void *)data;
396 311b7e33 2022-08-01 op 	iov[1].iov_len = len;
397 311b7e33 2022-08-01 op 
398 311b7e33 2022-08-01 op 	iov[2].iov_base = (void *)padding;
399 311b7e33 2022-08-01 op 	iov[2].iov_len = header.padding_len;
400 311b7e33 2022-08-01 op 
401 311b7e33 2022-08-01 op 	dump_fcgi_record("resp ", &header);
402 311b7e33 2022-08-01 op 
403 a596b957 2022-07-14 tracey 	/*
404 a596b957 2022-07-14 tracey 	 * XXX: add some simple write heuristics here
405 a596b957 2022-07-14 tracey 	 * On slower VMs, spotty connections, etc., we don't want to go right to
406 a596b957 2022-07-14 tracey 	 * disconnect. Let's at least try to write the data a few times before
407 a596b957 2022-07-14 tracey 	 * giving up.
408 a596b957 2022-07-14 tracey 	 */
409 311b7e33 2022-08-01 op 	while (tot > 0) {
410 311b7e33 2022-08-01 op 		nw = writev(c->fd, iov, nitems(iov));
411 cb8b8986 2022-07-28 op 		if (nw == 0) {
412 cb8b8986 2022-07-28 op 			c->sock->client_status = CLIENT_DISCONNECT;
413 cb8b8986 2022-07-28 op 			break;
414 cb8b8986 2022-07-28 op 		}
415 cb8b8986 2022-07-28 op 		if (nw == -1) {
416 cb8b8986 2022-07-28 op 			err++;
417 cb8b8986 2022-07-28 op 			if (errno == EAGAIN && err < th) {
418 cb8b8986 2022-07-28 op 				nanosleep(&ts, NULL);
419 cb8b8986 2022-07-28 op 				continue;
420 cb8b8986 2022-07-28 op 			}
421 8a078d7f 2023-05-17 op 			log_debug("%s: write failure: %s", __func__,
422 8a078d7f 2023-05-17 op 			    strerror(errno));
423 a596b957 2022-07-14 tracey 			c->sock->client_status = CLIENT_DISCONNECT;
424 3ff00ead 2022-08-09 op 			return -1;
425 a596b957 2022-07-14 tracey 		}
426 cb8b8986 2022-07-28 op 
427 311b7e33 2022-08-01 op 		if (nw != tot)
428 311b7e33 2022-08-01 op 			log_debug("%s: partial write: %zu vs %zu", __func__,
429 311b7e33 2022-08-01 op 			    nw, tot);
430 311b7e33 2022-08-01 op 
431 311b7e33 2022-08-01 op 		tot -= nw;
432 311b7e33 2022-08-01 op 		for (i = 0; i < nitems(iov); ++i) {
433 311b7e33 2022-08-01 op 			if (nw < iov[i].iov_len) {
434 311b7e33 2022-08-01 op 				iov[i].iov_base += nw;
435 311b7e33 2022-08-01 op 				iov[i].iov_len -= nw;
436 311b7e33 2022-08-01 op 				break;
437 311b7e33 2022-08-01 op 			}
438 311b7e33 2022-08-01 op 			nw -= iov[i].iov_len;
439 311b7e33 2022-08-01 op 			iov[i].iov_len = 0;
440 311b7e33 2022-08-01 op 		}
441 a596b957 2022-07-14 tracey 	}
442 3ff00ead 2022-08-09 op 
443 3ff00ead 2022-08-09 op 	return 0;
444 311b7e33 2022-08-01 op }
445 a596b957 2022-07-14 tracey 
446 3ff00ead 2022-08-09 op int
447 311b7e33 2022-08-01 op fcgi_send_response(struct request *c, int type, const void *data,
448 311b7e33 2022-08-01 op     size_t len)
449 311b7e33 2022-08-01 op {
450 3ff00ead 2022-08-09 op 	if (c->sock->client_status == CLIENT_DISCONNECT)
451 3ff00ead 2022-08-09 op 		return -1;
452 3ff00ead 2022-08-09 op 
453 311b7e33 2022-08-01 op 	while (len > FCGI_CONTENT_SIZE) {
454 3ff00ead 2022-08-09 op 		if (send_response(c, type, data, len) == -1)
455 3ff00ead 2022-08-09 op 			return -1;
456 311b7e33 2022-08-01 op 
457 311b7e33 2022-08-01 op 		data += FCGI_CONTENT_SIZE;
458 311b7e33 2022-08-01 op 		len -= FCGI_CONTENT_SIZE;
459 311b7e33 2022-08-01 op 	}
460 311b7e33 2022-08-01 op 
461 311b7e33 2022-08-01 op 	if (len == 0)
462 3ff00ead 2022-08-09 op 		return 0;
463 311b7e33 2022-08-01 op 
464 3ff00ead 2022-08-09 op 	return send_response(c, type, data, len);
465 a596b957 2022-07-14 tracey }
466 a596b957 2022-07-14 tracey 
467 a596b957 2022-07-14 tracey void
468 a596b957 2022-07-14 tracey fcgi_create_end_record(struct request *c)
469 a596b957 2022-07-14 tracey {
470 311b7e33 2022-08-01 op 	struct fcgi_end_request_body end_request;
471 a596b957 2022-07-14 tracey 
472 311b7e33 2022-08-01 op 	memset(&end_request, 0, sizeof(end_request));
473 311b7e33 2022-08-01 op 	end_request.app_status = htonl(0); /* script status */
474 311b7e33 2022-08-01 op 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
475 311b7e33 2022-08-01 op 
476 311b7e33 2022-08-01 op 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
477 311b7e33 2022-08-01 op 	    sizeof(end_request));
478 a596b957 2022-07-14 tracey }
479 a596b957 2022-07-14 tracey 
480 a596b957 2022-07-14 tracey void
481 a596b957 2022-07-14 tracey fcgi_cleanup_request(struct request *c)
482 a596b957 2022-07-14 tracey {
483 a596b957 2022-07-14 tracey 	cgi_inflight--;
484 a596b957 2022-07-14 tracey 	client_cnt--;
485 a596b957 2022-07-14 tracey 
486 a596b957 2022-07-14 tracey 	evtimer_del(&c->tmo);
487 a596b957 2022-07-14 tracey 	if (event_initialized(&c->ev))
488 a596b957 2022-07-14 tracey 		event_del(&c->ev);
489 a596b957 2022-07-14 tracey 
490 a596b957 2022-07-14 tracey 	close(c->fd);
491 ed619ca0 2022-12-14 op 	template_free(c->tp);
492 5add7f42 2023-03-10 op 	if (c->t != NULL)
493 5add7f42 2023-03-10 op 		gotweb_free_transport(c->t);
494 a596b957 2022-07-14 tracey 	free(c);
495 a596b957 2022-07-14 tracey }
496 a596b957 2022-07-14 tracey 
497 a596b957 2022-07-14 tracey void
498 a596b957 2022-07-14 tracey dump_fcgi_record(const char *p, struct fcgi_record_header *h)
499 a596b957 2022-07-14 tracey {
500 a596b957 2022-07-14 tracey 	dump_fcgi_record_header(p, h);
501 a596b957 2022-07-14 tracey 
502 a596b957 2022-07-14 tracey 	if (h->type == FCGI_BEGIN_REQUEST)
503 a596b957 2022-07-14 tracey 		dump_fcgi_begin_request_body(p,
504 a596b957 2022-07-14 tracey 		    (struct fcgi_begin_request_body *)(h + 1));
505 a596b957 2022-07-14 tracey 	else if (h->type == FCGI_END_REQUEST)
506 a596b957 2022-07-14 tracey 		dump_fcgi_end_request_body(p,
507 a596b957 2022-07-14 tracey 		    (struct fcgi_end_request_body *)(h + 1));
508 a596b957 2022-07-14 tracey }
509 a596b957 2022-07-14 tracey 
510 a596b957 2022-07-14 tracey void
511 a596b957 2022-07-14 tracey dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
512 a596b957 2022-07-14 tracey {
513 a596b957 2022-07-14 tracey 	log_debug("%sversion:         %d", p, h->version);
514 a596b957 2022-07-14 tracey 	log_debug("%stype:            %d", p, h->type);
515 a596b957 2022-07-14 tracey 	log_debug("%srequestId:       %d", p, ntohs(h->id));
516 a596b957 2022-07-14 tracey 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
517 a596b957 2022-07-14 tracey 	log_debug("%spaddingLength:   %d", p, h->padding_len);
518 a596b957 2022-07-14 tracey 	log_debug("%sreserved:        %d", p, h->reserved);
519 a596b957 2022-07-14 tracey }
520 a596b957 2022-07-14 tracey 
521 a596b957 2022-07-14 tracey void
522 a596b957 2022-07-14 tracey dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
523 a596b957 2022-07-14 tracey {
524 a596b957 2022-07-14 tracey 	log_debug("%srole             %d", p, ntohs(b->role));
525 a596b957 2022-07-14 tracey 	log_debug("%sflags            %d", p, b->flags);
526 a596b957 2022-07-14 tracey }
527 a596b957 2022-07-14 tracey 
528 a596b957 2022-07-14 tracey void
529 a596b957 2022-07-14 tracey dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
530 a596b957 2022-07-14 tracey {
531 a596b957 2022-07-14 tracey 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
532 a596b957 2022-07-14 tracey 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
533 a596b957 2022-07-14 tracey }