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 a596b957 2022-07-14 tracey 
 37 a596b957 2022-07-14 tracey #include "proc.h"
 38 a596b957 2022-07-14 tracey #include "gotwebd.h"
 39 a596b957 2022-07-14 tracey 
 40 a596b957 2022-07-14 tracey size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 41 a596b957 2022-07-14 tracey void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 42 a596b957 2022-07-14 tracey 	    uint16_t);
 43 a596b957 2022-07-14 tracey void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 44 3ff00ead 2022-08-09 op int	 fcgi_send_response(struct request *, int, const void *, size_t);
 45 a596b957 2022-07-14 tracey 
 46 a596b957 2022-07-14 tracey void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 47 a596b957 2022-07-14 tracey void	 dump_fcgi_begin_request_body(const char *,
 48 a596b957 2022-07-14 tracey 	    struct fcgi_begin_request_body *);
 49 a596b957 2022-07-14 tracey void	 dump_fcgi_end_request_body(const char *,
 50 a596b957 2022-07-14 tracey 	    struct fcgi_end_request_body *);
 51 a596b957 2022-07-14 tracey 
 52 a596b957 2022-07-14 tracey extern int	 cgi_inflight;
 53 a596b957 2022-07-14 tracey extern volatile int client_cnt;
 54 a596b957 2022-07-14 tracey 
 55 a596b957 2022-07-14 tracey void
 56 a596b957 2022-07-14 tracey fcgi_request(int fd, short events, void *arg)
 57 a596b957 2022-07-14 tracey {
 58 a596b957 2022-07-14 tracey 	struct request *c = arg;
 59 a596b957 2022-07-14 tracey 	ssize_t n;
 60 a596b957 2022-07-14 tracey 	size_t parsed = 0;
 61 a596b957 2022-07-14 tracey 
 62 a596b957 2022-07-14 tracey 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 63 a596b957 2022-07-14 tracey 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 64 a596b957 2022-07-14 tracey 
 65 a596b957 2022-07-14 tracey 	switch (n) {
 66 a596b957 2022-07-14 tracey 	case -1:
 67 a596b957 2022-07-14 tracey 		switch (errno) {
 68 a596b957 2022-07-14 tracey 		case EINTR:
 69 a596b957 2022-07-14 tracey 		case EAGAIN:
 70 a596b957 2022-07-14 tracey 			return;
 71 a596b957 2022-07-14 tracey 		default:
 72 a596b957 2022-07-14 tracey 			goto fail;
 73 a596b957 2022-07-14 tracey 		}
 74 a596b957 2022-07-14 tracey 		break;
 75 a596b957 2022-07-14 tracey 
 76 a596b957 2022-07-14 tracey 	case 0:
 77 a596b957 2022-07-14 tracey 		log_debug("closed connection");
 78 a596b957 2022-07-14 tracey 		goto fail;
 79 a596b957 2022-07-14 tracey 	default:
 80 a596b957 2022-07-14 tracey 		break;
 81 a596b957 2022-07-14 tracey 	}
 82 a596b957 2022-07-14 tracey 
 83 a596b957 2022-07-14 tracey 	c->buf_len += n;
 84 a596b957 2022-07-14 tracey 
 85 a596b957 2022-07-14 tracey 	/*
 86 a596b957 2022-07-14 tracey 	 * Parse the records as they are received. Per the FastCGI
 87 a596b957 2022-07-14 tracey 	 * specification, the server need only receive the FastCGI
 88 a596b957 2022-07-14 tracey 	 * parameter records in full; it is free to begin execution
 89 a596b957 2022-07-14 tracey 	 * at that point, which is what happens here.
 90 a596b957 2022-07-14 tracey 	 */
 91 a596b957 2022-07-14 tracey 	do {
 92 a596b957 2022-07-14 tracey 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 93 a596b957 2022-07-14 tracey 		if (parsed != 0) {
 94 a596b957 2022-07-14 tracey 			c->buf_pos += parsed;
 95 a596b957 2022-07-14 tracey 			c->buf_len -= parsed;
 96 a596b957 2022-07-14 tracey 		}
 97 a596b957 2022-07-14 tracey 	} while (parsed > 0 && c->buf_len > 0);
 98 a596b957 2022-07-14 tracey 
 99 a596b957 2022-07-14 tracey 	/* Make space for further reads */
100 a596b957 2022-07-14 tracey 	if (parsed != 0)
101 a596b957 2022-07-14 tracey 		if (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 a596b957 2022-07-14 tracey 	return;
106 a596b957 2022-07-14 tracey fail:
107 a596b957 2022-07-14 tracey 	fcgi_cleanup_request(c);
108 a596b957 2022-07-14 tracey }
109 a596b957 2022-07-14 tracey 
110 a596b957 2022-07-14 tracey size_t
111 a596b957 2022-07-14 tracey fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
112 a596b957 2022-07-14 tracey {
113 a596b957 2022-07-14 tracey 	struct fcgi_record_header *h;
114 a596b957 2022-07-14 tracey 
115 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header))
116 a596b957 2022-07-14 tracey 		 return 0;
117 a596b957 2022-07-14 tracey 
118 a596b957 2022-07-14 tracey 	h = (struct fcgi_record_header*) buf;
119 a596b957 2022-07-14 tracey 
120 a596b957 2022-07-14 tracey 	dump_fcgi_record("", h);
121 a596b957 2022-07-14 tracey 
122 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
123 a596b957 2022-07-14 tracey 	    + h->padding_len)
124 a596b957 2022-07-14 tracey 		 return 0;
125 a596b957 2022-07-14 tracey 
126 a596b957 2022-07-14 tracey 	if (h->version != 1)
127 a596b957 2022-07-14 tracey 		log_warn("wrong version");
128 a596b957 2022-07-14 tracey 
129 a596b957 2022-07-14 tracey 	switch (h->type) {
130 a596b957 2022-07-14 tracey 	case FCGI_BEGIN_REQUEST:
131 a596b957 2022-07-14 tracey 		fcgi_parse_begin_request(buf +
132 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_record_header),
133 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
134 a596b957 2022-07-14 tracey 		break;
135 a596b957 2022-07-14 tracey 	case FCGI_PARAMS:
136 a596b957 2022-07-14 tracey 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
137 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
138 a596b957 2022-07-14 tracey 		break;
139 a596b957 2022-07-14 tracey 	case FCGI_STDIN:
140 a596b957 2022-07-14 tracey 	case FCGI_ABORT_REQUEST:
141 3ff00ead 2022-08-09 op 		if (c->sock->client_status != CLIENT_DISCONNECT &&
142 3ff00ead 2022-08-09 op 		    c->outbuf_len != 0) {
143 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
144 3ff00ead 2022-08-09 op 			    c->outbuf_len);
145 3ff00ead 2022-08-09 op 		}
146 3ff00ead 2022-08-09 op 
147 a596b957 2022-07-14 tracey 		fcgi_create_end_record(c);
148 a596b957 2022-07-14 tracey 		fcgi_cleanup_request(c);
149 a596b957 2022-07-14 tracey 		return 0;
150 a596b957 2022-07-14 tracey 	default:
151 a596b957 2022-07-14 tracey 		log_warn("unimplemented type %d", h->type);
152 a596b957 2022-07-14 tracey 		break;
153 a596b957 2022-07-14 tracey 	}
154 a596b957 2022-07-14 tracey 
155 a596b957 2022-07-14 tracey 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
156 a596b957 2022-07-14 tracey 	    + h->padding_len);
157 a596b957 2022-07-14 tracey }
158 a596b957 2022-07-14 tracey 
159 a596b957 2022-07-14 tracey void
160 a596b957 2022-07-14 tracey fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
161 a596b957 2022-07-14 tracey     struct request *c, uint16_t id)
162 a596b957 2022-07-14 tracey {
163 a596b957 2022-07-14 tracey 	/* XXX -- FCGI_CANT_MPX_CONN */
164 a596b957 2022-07-14 tracey 	if (c->request_started) {
165 a596b957 2022-07-14 tracey 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
166 a596b957 2022-07-14 tracey 		return;
167 a596b957 2022-07-14 tracey 	}
168 a596b957 2022-07-14 tracey 
169 a596b957 2022-07-14 tracey 	if (n != sizeof(struct fcgi_begin_request_body)) {
170 a596b957 2022-07-14 tracey 		log_warn("wrong size %d != %lu", n,
171 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_begin_request_body));
172 a596b957 2022-07-14 tracey 		return;
173 a596b957 2022-07-14 tracey 	}
174 a596b957 2022-07-14 tracey 
175 a596b957 2022-07-14 tracey 	c->request_started = 1;
176 a596b957 2022-07-14 tracey 	c->id = id;
177 a596b957 2022-07-14 tracey }
178 a596b957 2022-07-14 tracey 
179 a596b957 2022-07-14 tracey void
180 a596b957 2022-07-14 tracey fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
181 a596b957 2022-07-14 tracey {
182 a596b957 2022-07-14 tracey 	uint32_t name_len, val_len;
183 40a95f4f 2022-09-01 op 	uint8_t *sd, *val;
184 a596b957 2022-07-14 tracey 
185 a596b957 2022-07-14 tracey 	if (!c->request_started) {
186 a596b957 2022-07-14 tracey 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
187 a596b957 2022-07-14 tracey 		return;
188 a596b957 2022-07-14 tracey 	}
189 a596b957 2022-07-14 tracey 
190 a596b957 2022-07-14 tracey 	if (c->id != id) {
191 a596b957 2022-07-14 tracey 		log_warn("unexpected id, ignoring");
192 a596b957 2022-07-14 tracey 		return;
193 a596b957 2022-07-14 tracey 	}
194 a596b957 2022-07-14 tracey 
195 a596b957 2022-07-14 tracey 	if (n == 0) {
196 a596b957 2022-07-14 tracey 		gotweb_process_request(c);
197 a596b957 2022-07-14 tracey 		return;
198 a596b957 2022-07-14 tracey 	}
199 a596b957 2022-07-14 tracey 
200 a596b957 2022-07-14 tracey 	while (n > 0) {
201 a596b957 2022-07-14 tracey 		if (buf[0] >> 7 == 0) {
202 a596b957 2022-07-14 tracey 			name_len = buf[0];
203 a596b957 2022-07-14 tracey 			n--;
204 a596b957 2022-07-14 tracey 			buf++;
205 a596b957 2022-07-14 tracey 		} else {
206 a596b957 2022-07-14 tracey 			if (n > 3) {
207 a596b957 2022-07-14 tracey 				name_len = ((buf[0] & 0x7f) << 24) +
208 a596b957 2022-07-14 tracey 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
209 a596b957 2022-07-14 tracey 				n -= 4;
210 a596b957 2022-07-14 tracey 				buf += 4;
211 a596b957 2022-07-14 tracey 			} else
212 a596b957 2022-07-14 tracey 				return;
213 a596b957 2022-07-14 tracey 		}
214 a596b957 2022-07-14 tracey 
215 40a95f4f 2022-09-01 op 		if (n == 0)
216 a596b957 2022-07-14 tracey 			return;
217 a596b957 2022-07-14 tracey 
218 40a95f4f 2022-09-01 op 		if (buf[0] >> 7 == 0) {
219 40a95f4f 2022-09-01 op 			val_len = buf[0];
220 40a95f4f 2022-09-01 op 			n--;
221 40a95f4f 2022-09-01 op 			buf++;
222 40a95f4f 2022-09-01 op 		} else {
223 40a95f4f 2022-09-01 op 			if (n > 3) {
224 40a95f4f 2022-09-01 op 				val_len = ((buf[0] & 0x7f) << 24) +
225 40a95f4f 2022-09-01 op 					(buf[1] << 16) + (buf[2] << 8) +
226 40a95f4f 2022-09-01 op 					buf[3];
227 40a95f4f 2022-09-01 op 				n -= 4;
228 40a95f4f 2022-09-01 op 				buf += 4;
229 40a95f4f 2022-09-01 op 			} else
230 40a95f4f 2022-09-01 op 				return;
231 a596b957 2022-07-14 tracey 		}
232 a596b957 2022-07-14 tracey 
233 40a95f4f 2022-09-01 op 		if (n < name_len + val_len)
234 a596b957 2022-07-14 tracey 			return;
235 a596b957 2022-07-14 tracey 
236 40a95f4f 2022-09-01 op 		val = buf + name_len;
237 a596b957 2022-07-14 tracey 
238 40a95f4f 2022-09-01 op 		if (c->querystring[0] == '\0' &&
239 40a95f4f 2022-09-01 op 		    val_len < MAX_QUERYSTRING &&
240 40a95f4f 2022-09-01 op 		    name_len == 12 &&
241 40a95f4f 2022-09-01 op 		    strncmp(buf, "QUERY_STRING", 12) == 0) {
242 40a95f4f 2022-09-01 op 			memcpy(c->querystring, val, val_len);
243 a596b957 2022-07-14 tracey 			c->querystring[val_len] = '\0';
244 a596b957 2022-07-14 tracey 		}
245 a596b957 2022-07-14 tracey 
246 40a95f4f 2022-09-01 op 		if (c->http_host[0] == '\0' &&
247 40a95f4f 2022-09-01 op 		    val_len < GOTWEBD_MAXTEXT &&
248 40a95f4f 2022-09-01 op 		    name_len == 9 &&
249 40a95f4f 2022-09-01 op 		    strncmp(buf, "HTTP_HOST", 9) == 0) {
250 40a95f4f 2022-09-01 op 			memcpy(c->http_host, val, val_len);
251 40a95f4f 2022-09-01 op 			c->http_host[val_len] = '\0';
252 40a95f4f 2022-09-01 op 
253 a596b957 2022-07-14 tracey 			/*
254 a596b957 2022-07-14 tracey 			 * lazily get subdomain
255 a596b957 2022-07-14 tracey 			 * will only get domain if no subdomain exists
256 a596b957 2022-07-14 tracey 			 * this can still work if gotweb server name is the same
257 a596b957 2022-07-14 tracey 			 */
258 40a95f4f 2022-09-01 op 			sd = strchr(c->http_host, '.');
259 a596b957 2022-07-14 tracey 			if (sd)
260 a596b957 2022-07-14 tracey 				*sd = '\0';
261 a596b957 2022-07-14 tracey 		}
262 40a95f4f 2022-09-01 op 
263 40a95f4f 2022-09-01 op 		if (c->script_name[0] == '\0' &&
264 40a95f4f 2022-09-01 op 		    val_len < MAX_SCRIPT_NAME &&
265 40a95f4f 2022-09-01 op 		    name_len == 11 &&
266 40a95f4f 2022-09-01 op 		    strncmp(buf, "SCRIPT_NAME", 11) == 0) {
267 40a95f4f 2022-09-01 op 			memcpy(c->script_name, val, val_len);
268 95a4a5a1 2022-08-30 op 			c->script_name[val_len] = '\0';
269 a596b957 2022-07-14 tracey 		}
270 40a95f4f 2022-09-01 op 
271 40a95f4f 2022-09-01 op 		if (c->server_name[0] == '\0' &&
272 40a95f4f 2022-09-01 op 		    val_len < MAX_SERVER_NAME &&
273 40a95f4f 2022-09-01 op 		    name_len == 11 &&
274 40a95f4f 2022-09-01 op 		    strncmp(buf, "SERVER_NAME", 11) == 0) {
275 40a95f4f 2022-09-01 op 			memcpy(c->server_name, val, val_len);
276 a596b957 2022-07-14 tracey 			c->server_name[val_len] = '\0';
277 a596b957 2022-07-14 tracey 		}
278 a596b957 2022-07-14 tracey 
279 40a95f4f 2022-09-01 op 		buf += name_len + val_len;
280 40a95f4f 2022-09-01 op 		n -= name_len - val_len;
281 a596b957 2022-07-14 tracey 	}
282 a596b957 2022-07-14 tracey }
283 a596b957 2022-07-14 tracey 
284 a596b957 2022-07-14 tracey void
285 a596b957 2022-07-14 tracey fcgi_timeout(int fd, short events, void *arg)
286 a596b957 2022-07-14 tracey {
287 a596b957 2022-07-14 tracey 	fcgi_cleanup_request((struct request*) arg);
288 01498c42 2022-08-19 op }
289 01498c42 2022-08-19 op 
290 01498c42 2022-08-19 op int
291 01498c42 2022-08-19 op fcgi_printf(struct request *c, const char *fmt, ...)
292 01498c42 2022-08-19 op {
293 01498c42 2022-08-19 op 	va_list ap;
294 01498c42 2022-08-19 op 	char *str;
295 01498c42 2022-08-19 op 	int r;
296 01498c42 2022-08-19 op 
297 01498c42 2022-08-19 op 	va_start(ap, fmt);
298 01498c42 2022-08-19 op 	r = vasprintf(&str, fmt, ap);
299 01498c42 2022-08-19 op 	va_end(ap);
300 01498c42 2022-08-19 op 
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 a596b957 2022-07-14 tracey fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
313 a596b957 2022-07-14 tracey {
314 3ff00ead 2022-08-09 op 	int r;
315 3ff00ead 2022-08-09 op 
316 a596b957 2022-07-14 tracey 	if (c->sock->client_status == CLIENT_DISCONNECT)
317 a596b957 2022-07-14 tracey 		return -1;
318 a596b957 2022-07-14 tracey 
319 9dd0e5e9 2022-07-28 op 	if (data == NULL || len == 0)
320 a596b957 2022-07-14 tracey 		return 0;
321 a596b957 2022-07-14 tracey 
322 3ff00ead 2022-08-09 op 	/*
323 3ff00ead 2022-08-09 op 	 * special case: send big replies -like blobs- directly
324 3ff00ead 2022-08-09 op 	 * without copying.
325 3ff00ead 2022-08-09 op 	 */
326 3ff00ead 2022-08-09 op 	if (len > sizeof(c->outbuf)) {
327 3ff00ead 2022-08-09 op 		if (c->outbuf_len > 0) {
328 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT,
329 3ff00ead 2022-08-09 op 			    c->outbuf, c->outbuf_len);
330 3ff00ead 2022-08-09 op 			c->outbuf_len = 0;
331 3ff00ead 2022-08-09 op 		}
332 3ff00ead 2022-08-09 op 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
333 3ff00ead 2022-08-09 op 	}
334 3ff00ead 2022-08-09 op 
335 3ff00ead 2022-08-09 op 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
336 3ff00ead 2022-08-09 op 		memcpy(c->outbuf + c->outbuf_len, data, len);
337 3ff00ead 2022-08-09 op 		c->outbuf_len += len;
338 3ff00ead 2022-08-09 op 		return 0;
339 3ff00ead 2022-08-09 op 	}
340 3ff00ead 2022-08-09 op 
341 3ff00ead 2022-08-09 op 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
342 3ff00ead 2022-08-09 op 	if (r == -1)
343 3ff00ead 2022-08-09 op 		return -1;
344 3ff00ead 2022-08-09 op 
345 3ff00ead 2022-08-09 op 	memcpy(c->outbuf, data, len);
346 3ff00ead 2022-08-09 op 	c->outbuf_len = len;
347 a596b957 2022-07-14 tracey 	return 0;
348 a596b957 2022-07-14 tracey }
349 a596b957 2022-07-14 tracey 
350 3ff00ead 2022-08-09 op static int
351 311b7e33 2022-08-01 op send_response(struct request *c, int type, const uint8_t *data,
352 311b7e33 2022-08-01 op     size_t len)
353 a596b957 2022-07-14 tracey {
354 311b7e33 2022-08-01 op 	static const uint8_t padding[FCGI_PADDING_SIZE];
355 311b7e33 2022-08-01 op 	struct fcgi_record_header header;
356 311b7e33 2022-08-01 op 	struct iovec iov[3];
357 a596b957 2022-07-14 tracey 	struct timespec ts;
358 cb8b8986 2022-07-28 op 	ssize_t nw;
359 311b7e33 2022-08-01 op 	size_t padded_len, tot;
360 311b7e33 2022-08-01 op 	int i, err = 0, th = 2000;
361 a596b957 2022-07-14 tracey 
362 a596b957 2022-07-14 tracey 	ts.tv_sec = 0;
363 a596b957 2022-07-14 tracey 	ts.tv_nsec = 50;
364 a596b957 2022-07-14 tracey 
365 311b7e33 2022-08-01 op 	memset(&header, 0, sizeof(header));
366 311b7e33 2022-08-01 op 	header.version = 1;
367 311b7e33 2022-08-01 op 	header.type = type;
368 311b7e33 2022-08-01 op 	header.id = htons(c->id);
369 311b7e33 2022-08-01 op 	header.content_len = htons(len);
370 a596b957 2022-07-14 tracey 
371 a596b957 2022-07-14 tracey 	/* The FastCGI spec suggests to align the output buffer */
372 311b7e33 2022-08-01 op 	tot = sizeof(header) + len;
373 311b7e33 2022-08-01 op 	padded_len = FCGI_ALIGN(tot);
374 311b7e33 2022-08-01 op 	if (padded_len > tot) {
375 311b7e33 2022-08-01 op 		header.padding_len = padded_len - tot;
376 311b7e33 2022-08-01 op 		tot += header.padding_len;
377 a596b957 2022-07-14 tracey 	}
378 a596b957 2022-07-14 tracey 
379 311b7e33 2022-08-01 op 	iov[0].iov_base = &header;
380 311b7e33 2022-08-01 op 	iov[0].iov_len = sizeof(header);
381 a596b957 2022-07-14 tracey 
382 311b7e33 2022-08-01 op 	iov[1].iov_base = (void *)data;
383 311b7e33 2022-08-01 op 	iov[1].iov_len = len;
384 311b7e33 2022-08-01 op 
385 311b7e33 2022-08-01 op 	iov[2].iov_base = (void *)padding;
386 311b7e33 2022-08-01 op 	iov[2].iov_len = header.padding_len;
387 311b7e33 2022-08-01 op 
388 311b7e33 2022-08-01 op 	dump_fcgi_record("resp ", &header);
389 311b7e33 2022-08-01 op 
390 a596b957 2022-07-14 tracey 	/*
391 a596b957 2022-07-14 tracey 	 * XXX: add some simple write heuristics here
392 a596b957 2022-07-14 tracey 	 * On slower VMs, spotty connections, etc., we don't want to go right to
393 a596b957 2022-07-14 tracey 	 * disconnect. Let's at least try to write the data a few times before
394 a596b957 2022-07-14 tracey 	 * giving up.
395 a596b957 2022-07-14 tracey 	 */
396 311b7e33 2022-08-01 op 	while (tot > 0) {
397 311b7e33 2022-08-01 op 		nw = writev(c->fd, iov, nitems(iov));
398 cb8b8986 2022-07-28 op 		if (nw == 0) {
399 cb8b8986 2022-07-28 op 			c->sock->client_status = CLIENT_DISCONNECT;
400 cb8b8986 2022-07-28 op 			break;
401 cb8b8986 2022-07-28 op 		}
402 cb8b8986 2022-07-28 op 		if (nw == -1) {
403 cb8b8986 2022-07-28 op 			err++;
404 cb8b8986 2022-07-28 op 			if (errno == EAGAIN && err < th) {
405 cb8b8986 2022-07-28 op 				nanosleep(&ts, NULL);
406 cb8b8986 2022-07-28 op 				continue;
407 cb8b8986 2022-07-28 op 			}
408 b43fa49a 2022-07-28 op 			log_warn("%s: write failure", __func__);
409 a596b957 2022-07-14 tracey 			c->sock->client_status = CLIENT_DISCONNECT;
410 3ff00ead 2022-08-09 op 			return -1;
411 a596b957 2022-07-14 tracey 		}
412 cb8b8986 2022-07-28 op 
413 311b7e33 2022-08-01 op 		if (nw != tot)
414 311b7e33 2022-08-01 op 			log_debug("%s: partial write: %zu vs %zu", __func__,
415 311b7e33 2022-08-01 op 			    nw, tot);
416 311b7e33 2022-08-01 op 
417 311b7e33 2022-08-01 op 		tot -= nw;
418 311b7e33 2022-08-01 op 		for (i = 0; i < nitems(iov); ++i) {
419 311b7e33 2022-08-01 op 			if (nw < iov[i].iov_len) {
420 311b7e33 2022-08-01 op 				iov[i].iov_base += nw;
421 311b7e33 2022-08-01 op 				iov[i].iov_len -= nw;
422 311b7e33 2022-08-01 op 				break;
423 311b7e33 2022-08-01 op 			}
424 311b7e33 2022-08-01 op 			nw -= iov[i].iov_len;
425 311b7e33 2022-08-01 op 			iov[i].iov_len = 0;
426 311b7e33 2022-08-01 op 		}
427 a596b957 2022-07-14 tracey 	}
428 3ff00ead 2022-08-09 op 
429 3ff00ead 2022-08-09 op 	return 0;
430 311b7e33 2022-08-01 op }
431 a596b957 2022-07-14 tracey 
432 3ff00ead 2022-08-09 op int
433 311b7e33 2022-08-01 op fcgi_send_response(struct request *c, int type, const void *data,
434 311b7e33 2022-08-01 op     size_t len)
435 311b7e33 2022-08-01 op {
436 3ff00ead 2022-08-09 op 	if (c->sock->client_status == CLIENT_DISCONNECT)
437 3ff00ead 2022-08-09 op 		return -1;
438 3ff00ead 2022-08-09 op 
439 311b7e33 2022-08-01 op 	while (len > FCGI_CONTENT_SIZE) {
440 3ff00ead 2022-08-09 op 		if (send_response(c, type, data, len) == -1)
441 3ff00ead 2022-08-09 op 			return -1;
442 311b7e33 2022-08-01 op 
443 311b7e33 2022-08-01 op 		data += FCGI_CONTENT_SIZE;
444 311b7e33 2022-08-01 op 		len -= FCGI_CONTENT_SIZE;
445 311b7e33 2022-08-01 op 	}
446 311b7e33 2022-08-01 op 
447 311b7e33 2022-08-01 op 	if (len == 0)
448 3ff00ead 2022-08-09 op 		return 0;
449 311b7e33 2022-08-01 op 
450 3ff00ead 2022-08-09 op 	return send_response(c, type, data, len);
451 a596b957 2022-07-14 tracey }
452 a596b957 2022-07-14 tracey 
453 a596b957 2022-07-14 tracey void
454 a596b957 2022-07-14 tracey fcgi_create_end_record(struct request *c)
455 a596b957 2022-07-14 tracey {
456 311b7e33 2022-08-01 op 	struct fcgi_end_request_body end_request;
457 a596b957 2022-07-14 tracey 
458 311b7e33 2022-08-01 op 	memset(&end_request, 0, sizeof(end_request));
459 311b7e33 2022-08-01 op 	end_request.app_status = htonl(0); /* script status */
460 311b7e33 2022-08-01 op 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
461 311b7e33 2022-08-01 op 
462 311b7e33 2022-08-01 op 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
463 311b7e33 2022-08-01 op 	    sizeof(end_request));
464 a596b957 2022-07-14 tracey }
465 a596b957 2022-07-14 tracey 
466 a596b957 2022-07-14 tracey void
467 a596b957 2022-07-14 tracey fcgi_cleanup_request(struct request *c)
468 a596b957 2022-07-14 tracey {
469 a596b957 2022-07-14 tracey 	cgi_inflight--;
470 a596b957 2022-07-14 tracey 	client_cnt--;
471 a596b957 2022-07-14 tracey 
472 a596b957 2022-07-14 tracey 	evtimer_del(&c->tmo);
473 a596b957 2022-07-14 tracey 	if (event_initialized(&c->ev))
474 a596b957 2022-07-14 tracey 		event_del(&c->ev);
475 a596b957 2022-07-14 tracey 
476 a596b957 2022-07-14 tracey 	close(c->fd);
477 a596b957 2022-07-14 tracey 	gotweb_free_transport(c->t);
478 a596b957 2022-07-14 tracey 	free(c);
479 a596b957 2022-07-14 tracey }
480 a596b957 2022-07-14 tracey 
481 a596b957 2022-07-14 tracey void
482 a596b957 2022-07-14 tracey dump_fcgi_record(const char *p, struct fcgi_record_header *h)
483 a596b957 2022-07-14 tracey {
484 a596b957 2022-07-14 tracey 	dump_fcgi_record_header(p, h);
485 a596b957 2022-07-14 tracey 
486 a596b957 2022-07-14 tracey 	if (h->type == FCGI_BEGIN_REQUEST)
487 a596b957 2022-07-14 tracey 		dump_fcgi_begin_request_body(p,
488 a596b957 2022-07-14 tracey 		    (struct fcgi_begin_request_body *)(h + 1));
489 a596b957 2022-07-14 tracey 	else if (h->type == FCGI_END_REQUEST)
490 a596b957 2022-07-14 tracey 		dump_fcgi_end_request_body(p,
491 a596b957 2022-07-14 tracey 		    (struct fcgi_end_request_body *)(h + 1));
492 a596b957 2022-07-14 tracey }
493 a596b957 2022-07-14 tracey 
494 a596b957 2022-07-14 tracey void
495 a596b957 2022-07-14 tracey dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
496 a596b957 2022-07-14 tracey {
497 a596b957 2022-07-14 tracey 	log_debug("%sversion:         %d", p, h->version);
498 a596b957 2022-07-14 tracey 	log_debug("%stype:            %d", p, h->type);
499 a596b957 2022-07-14 tracey 	log_debug("%srequestId:       %d", p, ntohs(h->id));
500 a596b957 2022-07-14 tracey 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
501 a596b957 2022-07-14 tracey 	log_debug("%spaddingLength:   %d", p, h->padding_len);
502 a596b957 2022-07-14 tracey 	log_debug("%sreserved:        %d", p, h->reserved);
503 a596b957 2022-07-14 tracey }
504 a596b957 2022-07-14 tracey 
505 a596b957 2022-07-14 tracey void
506 a596b957 2022-07-14 tracey dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
507 a596b957 2022-07-14 tracey {
508 a596b957 2022-07-14 tracey 	log_debug("%srole             %d", p, ntohs(b->role));
509 a596b957 2022-07-14 tracey 	log_debug("%sflags            %d", p, b->flags);
510 a596b957 2022-07-14 tracey }
511 a596b957 2022-07-14 tracey 
512 a596b957 2022-07-14 tracey void
513 a596b957 2022-07-14 tracey dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
514 a596b957 2022-07-14 tracey {
515 a596b957 2022-07-14 tracey 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
516 a596b957 2022-07-14 tracey 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
517 a596b957 2022-07-14 tracey }