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 ed619ca0 2022-12-14 op #include "tmpl.h"
 40 a596b957 2022-07-14 tracey 
 41 a596b957 2022-07-14 tracey size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 42 a596b957 2022-07-14 tracey void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 43 a596b957 2022-07-14 tracey 	    uint16_t);
 44 a596b957 2022-07-14 tracey void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 45 3ff00ead 2022-08-09 op int	 fcgi_send_response(struct request *, int, const void *, size_t);
 46 a596b957 2022-07-14 tracey 
 47 a596b957 2022-07-14 tracey void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 48 a596b957 2022-07-14 tracey void	 dump_fcgi_begin_request_body(const char *,
 49 a596b957 2022-07-14 tracey 	    struct fcgi_begin_request_body *);
 50 a596b957 2022-07-14 tracey void	 dump_fcgi_end_request_body(const char *,
 51 a596b957 2022-07-14 tracey 	    struct fcgi_end_request_body *);
 52 a596b957 2022-07-14 tracey 
 53 a596b957 2022-07-14 tracey extern int	 cgi_inflight;
 54 a596b957 2022-07-14 tracey extern volatile int client_cnt;
 55 a596b957 2022-07-14 tracey 
 56 a596b957 2022-07-14 tracey void
 57 a596b957 2022-07-14 tracey fcgi_request(int fd, short events, void *arg)
 58 a596b957 2022-07-14 tracey {
 59 a596b957 2022-07-14 tracey 	struct request *c = arg;
 60 a596b957 2022-07-14 tracey 	ssize_t n;
 61 a596b957 2022-07-14 tracey 	size_t parsed = 0;
 62 a596b957 2022-07-14 tracey 
 63 a596b957 2022-07-14 tracey 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 64 a596b957 2022-07-14 tracey 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 65 a596b957 2022-07-14 tracey 
 66 a596b957 2022-07-14 tracey 	switch (n) {
 67 a596b957 2022-07-14 tracey 	case -1:
 68 a596b957 2022-07-14 tracey 		switch (errno) {
 69 a596b957 2022-07-14 tracey 		case EINTR:
 70 a596b957 2022-07-14 tracey 		case EAGAIN:
 71 a596b957 2022-07-14 tracey 			return;
 72 a596b957 2022-07-14 tracey 		default:
 73 a596b957 2022-07-14 tracey 			goto fail;
 74 a596b957 2022-07-14 tracey 		}
 75 a596b957 2022-07-14 tracey 		break;
 76 a596b957 2022-07-14 tracey 
 77 a596b957 2022-07-14 tracey 	case 0:
 78 a596b957 2022-07-14 tracey 		log_debug("closed connection");
 79 a596b957 2022-07-14 tracey 		goto fail;
 80 a596b957 2022-07-14 tracey 	default:
 81 a596b957 2022-07-14 tracey 		break;
 82 a596b957 2022-07-14 tracey 	}
 83 a596b957 2022-07-14 tracey 
 84 a596b957 2022-07-14 tracey 	c->buf_len += n;
 85 a596b957 2022-07-14 tracey 
 86 a596b957 2022-07-14 tracey 	/*
 87 a596b957 2022-07-14 tracey 	 * Parse the records as they are received. Per the FastCGI
 88 a596b957 2022-07-14 tracey 	 * specification, the server need only receive the FastCGI
 89 a596b957 2022-07-14 tracey 	 * parameter records in full; it is free to begin execution
 90 a596b957 2022-07-14 tracey 	 * at that point, which is what happens here.
 91 a596b957 2022-07-14 tracey 	 */
 92 a596b957 2022-07-14 tracey 	do {
 93 a596b957 2022-07-14 tracey 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 94 a596b957 2022-07-14 tracey 		if (parsed != 0) {
 95 a596b957 2022-07-14 tracey 			c->buf_pos += parsed;
 96 a596b957 2022-07-14 tracey 			c->buf_len -= parsed;
 97 a596b957 2022-07-14 tracey 		}
 98 a596b957 2022-07-14 tracey 	} while (parsed > 0 && c->buf_len > 0);
 99 a596b957 2022-07-14 tracey 
100 a596b957 2022-07-14 tracey 	/* Make space for further reads */
101 a596b957 2022-07-14 tracey 	if (parsed != 0)
102 a596b957 2022-07-14 tracey 		if (c->buf_len > 0) {
103 a596b957 2022-07-14 tracey 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
104 a596b957 2022-07-14 tracey 			c->buf_pos = 0;
105 a596b957 2022-07-14 tracey 		}
106 a596b957 2022-07-14 tracey 	return;
107 a596b957 2022-07-14 tracey fail:
108 a596b957 2022-07-14 tracey 	fcgi_cleanup_request(c);
109 a596b957 2022-07-14 tracey }
110 a596b957 2022-07-14 tracey 
111 a596b957 2022-07-14 tracey size_t
112 a596b957 2022-07-14 tracey fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
113 a596b957 2022-07-14 tracey {
114 a596b957 2022-07-14 tracey 	struct fcgi_record_header *h;
115 a596b957 2022-07-14 tracey 
116 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header))
117 a596b957 2022-07-14 tracey 		 return 0;
118 a596b957 2022-07-14 tracey 
119 a596b957 2022-07-14 tracey 	h = (struct fcgi_record_header*) buf;
120 a596b957 2022-07-14 tracey 
121 a596b957 2022-07-14 tracey 	dump_fcgi_record("", h);
122 a596b957 2022-07-14 tracey 
123 a596b957 2022-07-14 tracey 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
124 a596b957 2022-07-14 tracey 	    + h->padding_len)
125 a596b957 2022-07-14 tracey 		 return 0;
126 a596b957 2022-07-14 tracey 
127 a596b957 2022-07-14 tracey 	if (h->version != 1)
128 a596b957 2022-07-14 tracey 		log_warn("wrong version");
129 a596b957 2022-07-14 tracey 
130 a596b957 2022-07-14 tracey 	switch (h->type) {
131 a596b957 2022-07-14 tracey 	case FCGI_BEGIN_REQUEST:
132 a596b957 2022-07-14 tracey 		fcgi_parse_begin_request(buf +
133 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_record_header),
134 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
135 a596b957 2022-07-14 tracey 		break;
136 a596b957 2022-07-14 tracey 	case FCGI_PARAMS:
137 a596b957 2022-07-14 tracey 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
138 a596b957 2022-07-14 tracey 		    ntohs(h->content_len), c, ntohs(h->id));
139 a596b957 2022-07-14 tracey 		break;
140 a596b957 2022-07-14 tracey 	case FCGI_STDIN:
141 a596b957 2022-07-14 tracey 	case FCGI_ABORT_REQUEST:
142 3ff00ead 2022-08-09 op 		if (c->sock->client_status != CLIENT_DISCONNECT &&
143 3ff00ead 2022-08-09 op 		    c->outbuf_len != 0) {
144 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
145 3ff00ead 2022-08-09 op 			    c->outbuf_len);
146 3ff00ead 2022-08-09 op 		}
147 3ff00ead 2022-08-09 op 
148 a596b957 2022-07-14 tracey 		fcgi_create_end_record(c);
149 a596b957 2022-07-14 tracey 		fcgi_cleanup_request(c);
150 a596b957 2022-07-14 tracey 		return 0;
151 a596b957 2022-07-14 tracey 	default:
152 a596b957 2022-07-14 tracey 		log_warn("unimplemented type %d", h->type);
153 a596b957 2022-07-14 tracey 		break;
154 a596b957 2022-07-14 tracey 	}
155 a596b957 2022-07-14 tracey 
156 a596b957 2022-07-14 tracey 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
157 a596b957 2022-07-14 tracey 	    + h->padding_len);
158 a596b957 2022-07-14 tracey }
159 a596b957 2022-07-14 tracey 
160 a596b957 2022-07-14 tracey void
161 a596b957 2022-07-14 tracey fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
162 a596b957 2022-07-14 tracey     struct request *c, uint16_t id)
163 a596b957 2022-07-14 tracey {
164 a596b957 2022-07-14 tracey 	/* XXX -- FCGI_CANT_MPX_CONN */
165 a596b957 2022-07-14 tracey 	if (c->request_started) {
166 a596b957 2022-07-14 tracey 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
167 a596b957 2022-07-14 tracey 		return;
168 a596b957 2022-07-14 tracey 	}
169 a596b957 2022-07-14 tracey 
170 a596b957 2022-07-14 tracey 	if (n != sizeof(struct fcgi_begin_request_body)) {
171 a596b957 2022-07-14 tracey 		log_warn("wrong size %d != %lu", n,
172 a596b957 2022-07-14 tracey 		    sizeof(struct fcgi_begin_request_body));
173 a596b957 2022-07-14 tracey 		return;
174 a596b957 2022-07-14 tracey 	}
175 a596b957 2022-07-14 tracey 
176 a596b957 2022-07-14 tracey 	c->request_started = 1;
177 a596b957 2022-07-14 tracey 	c->id = id;
178 a596b957 2022-07-14 tracey }
179 a596b957 2022-07-14 tracey 
180 a596b957 2022-07-14 tracey void
181 a596b957 2022-07-14 tracey fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
182 a596b957 2022-07-14 tracey {
183 a596b957 2022-07-14 tracey 	uint32_t name_len, val_len;
184 40a95f4f 2022-09-01 op 	uint8_t *sd, *val;
185 a596b957 2022-07-14 tracey 
186 a596b957 2022-07-14 tracey 	if (!c->request_started) {
187 a596b957 2022-07-14 tracey 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
188 a596b957 2022-07-14 tracey 		return;
189 a596b957 2022-07-14 tracey 	}
190 a596b957 2022-07-14 tracey 
191 a596b957 2022-07-14 tracey 	if (c->id != id) {
192 a596b957 2022-07-14 tracey 		log_warn("unexpected id, ignoring");
193 a596b957 2022-07-14 tracey 		return;
194 a596b957 2022-07-14 tracey 	}
195 a596b957 2022-07-14 tracey 
196 a596b957 2022-07-14 tracey 	if (n == 0) {
197 a596b957 2022-07-14 tracey 		gotweb_process_request(c);
198 a596b957 2022-07-14 tracey 		return;
199 a596b957 2022-07-14 tracey 	}
200 a596b957 2022-07-14 tracey 
201 a596b957 2022-07-14 tracey 	while (n > 0) {
202 a596b957 2022-07-14 tracey 		if (buf[0] >> 7 == 0) {
203 a596b957 2022-07-14 tracey 			name_len = buf[0];
204 a596b957 2022-07-14 tracey 			n--;
205 a596b957 2022-07-14 tracey 			buf++;
206 a596b957 2022-07-14 tracey 		} else {
207 a596b957 2022-07-14 tracey 			if (n > 3) {
208 a596b957 2022-07-14 tracey 				name_len = ((buf[0] & 0x7f) << 24) +
209 a596b957 2022-07-14 tracey 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
210 a596b957 2022-07-14 tracey 				n -= 4;
211 a596b957 2022-07-14 tracey 				buf += 4;
212 a596b957 2022-07-14 tracey 			} else
213 a596b957 2022-07-14 tracey 				return;
214 a596b957 2022-07-14 tracey 		}
215 a596b957 2022-07-14 tracey 
216 40a95f4f 2022-09-01 op 		if (n == 0)
217 a596b957 2022-07-14 tracey 			return;
218 a596b957 2022-07-14 tracey 
219 40a95f4f 2022-09-01 op 		if (buf[0] >> 7 == 0) {
220 40a95f4f 2022-09-01 op 			val_len = buf[0];
221 40a95f4f 2022-09-01 op 			n--;
222 40a95f4f 2022-09-01 op 			buf++;
223 40a95f4f 2022-09-01 op 		} else {
224 40a95f4f 2022-09-01 op 			if (n > 3) {
225 40a95f4f 2022-09-01 op 				val_len = ((buf[0] & 0x7f) << 24) +
226 40a95f4f 2022-09-01 op 					(buf[1] << 16) + (buf[2] << 8) +
227 40a95f4f 2022-09-01 op 					buf[3];
228 40a95f4f 2022-09-01 op 				n -= 4;
229 40a95f4f 2022-09-01 op 				buf += 4;
230 40a95f4f 2022-09-01 op 			} else
231 40a95f4f 2022-09-01 op 				return;
232 a596b957 2022-07-14 tracey 		}
233 a596b957 2022-07-14 tracey 
234 40a95f4f 2022-09-01 op 		if (n < name_len + val_len)
235 a596b957 2022-07-14 tracey 			return;
236 a596b957 2022-07-14 tracey 
237 40a95f4f 2022-09-01 op 		val = buf + name_len;
238 a596b957 2022-07-14 tracey 
239 40a95f4f 2022-09-01 op 		if (c->querystring[0] == '\0' &&
240 40a95f4f 2022-09-01 op 		    val_len < MAX_QUERYSTRING &&
241 40a95f4f 2022-09-01 op 		    name_len == 12 &&
242 40a95f4f 2022-09-01 op 		    strncmp(buf, "QUERY_STRING", 12) == 0) {
243 40a95f4f 2022-09-01 op 			memcpy(c->querystring, val, val_len);
244 a596b957 2022-07-14 tracey 			c->querystring[val_len] = '\0';
245 a596b957 2022-07-14 tracey 		}
246 a596b957 2022-07-14 tracey 
247 40a95f4f 2022-09-01 op 		if (c->http_host[0] == '\0' &&
248 40a95f4f 2022-09-01 op 		    val_len < GOTWEBD_MAXTEXT &&
249 40a95f4f 2022-09-01 op 		    name_len == 9 &&
250 40a95f4f 2022-09-01 op 		    strncmp(buf, "HTTP_HOST", 9) == 0) {
251 40a95f4f 2022-09-01 op 			memcpy(c->http_host, val, val_len);
252 40a95f4f 2022-09-01 op 			c->http_host[val_len] = '\0';
253 40a95f4f 2022-09-01 op 
254 a596b957 2022-07-14 tracey 			/*
255 a596b957 2022-07-14 tracey 			 * lazily get subdomain
256 a596b957 2022-07-14 tracey 			 * will only get domain if no subdomain exists
257 a596b957 2022-07-14 tracey 			 * this can still work if gotweb server name is the same
258 a596b957 2022-07-14 tracey 			 */
259 40a95f4f 2022-09-01 op 			sd = strchr(c->http_host, '.');
260 a596b957 2022-07-14 tracey 			if (sd)
261 a596b957 2022-07-14 tracey 				*sd = '\0';
262 a596b957 2022-07-14 tracey 		}
263 40a95f4f 2022-09-01 op 
264 d19d9fce 2022-12-20 op 		if (c->document_uri[0] == '\0' &&
265 d19d9fce 2022-12-20 op 		    val_len < MAX_DOCUMENT_URI &&
266 d19d9fce 2022-12-20 op 		    name_len == 12 &&
267 d19d9fce 2022-12-20 op 		    strncmp(buf, "DOCUMENT_URI", 12) == 0) {
268 d19d9fce 2022-12-20 op 			memcpy(c->document_uri, val, val_len);
269 d19d9fce 2022-12-20 op 			c->document_uri[val_len] = '\0';
270 a596b957 2022-07-14 tracey 		}
271 40a95f4f 2022-09-01 op 
272 40a95f4f 2022-09-01 op 		if (c->server_name[0] == '\0' &&
273 40a95f4f 2022-09-01 op 		    val_len < MAX_SERVER_NAME &&
274 40a95f4f 2022-09-01 op 		    name_len == 11 &&
275 40a95f4f 2022-09-01 op 		    strncmp(buf, "SERVER_NAME", 11) == 0) {
276 40a95f4f 2022-09-01 op 			memcpy(c->server_name, val, val_len);
277 a596b957 2022-07-14 tracey 			c->server_name[val_len] = '\0';
278 a596b957 2022-07-14 tracey 		}
279 1abb18e1 2022-12-20 op 
280 1abb18e1 2022-12-20 op 		if (name_len == 5 &&
281 1abb18e1 2022-12-20 op 		    strncmp(buf, "HTTPS", 5) == 0)
282 1abb18e1 2022-12-20 op 			c->https = 1;
283 a596b957 2022-07-14 tracey 
284 40a95f4f 2022-09-01 op 		buf += name_len + val_len;
285 40a95f4f 2022-09-01 op 		n -= name_len - val_len;
286 a596b957 2022-07-14 tracey 	}
287 a596b957 2022-07-14 tracey }
288 a596b957 2022-07-14 tracey 
289 a596b957 2022-07-14 tracey void
290 a596b957 2022-07-14 tracey fcgi_timeout(int fd, short events, void *arg)
291 a596b957 2022-07-14 tracey {
292 a596b957 2022-07-14 tracey 	fcgi_cleanup_request((struct request*) arg);
293 01498c42 2022-08-19 op }
294 01498c42 2022-08-19 op 
295 01498c42 2022-08-19 op int
296 ed619ca0 2022-12-14 op fcgi_puts(struct template *tp, const char *str)
297 ed619ca0 2022-12-14 op {
298 ed619ca0 2022-12-14 op 	if (str == NULL)
299 ed619ca0 2022-12-14 op 		return 0;
300 ed619ca0 2022-12-14 op 	return fcgi_gen_binary_response(tp->tp_arg, str, strlen(str));
301 ed619ca0 2022-12-14 op }
302 ed619ca0 2022-12-14 op 
303 ed619ca0 2022-12-14 op int
304 ed619ca0 2022-12-14 op fcgi_putc(struct template *tp, int ch)
305 ed619ca0 2022-12-14 op {
306 ed619ca0 2022-12-14 op 	uint8_t c = ch;
307 ed619ca0 2022-12-14 op 	return fcgi_gen_binary_response(tp->tp_arg, &c, 1);
308 ed619ca0 2022-12-14 op }
309 ed619ca0 2022-12-14 op 
310 ed619ca0 2022-12-14 op int
311 8d02314f 2022-09-07 op fcgi_vprintf(struct request *c, const char *fmt, va_list ap)
312 01498c42 2022-08-19 op {
313 01498c42 2022-08-19 op 	char *str;
314 01498c42 2022-08-19 op 	int r;
315 01498c42 2022-08-19 op 
316 01498c42 2022-08-19 op 	r = vasprintf(&str, fmt, ap);
317 01498c42 2022-08-19 op 	if (r == -1) {
318 01498c42 2022-08-19 op 		log_warn("%s: asprintf", __func__);
319 01498c42 2022-08-19 op 		return -1;
320 01498c42 2022-08-19 op 	}
321 01498c42 2022-08-19 op 
322 01498c42 2022-08-19 op 	r = fcgi_gen_binary_response(c, str, r);
323 01498c42 2022-08-19 op 	free(str);
324 01498c42 2022-08-19 op 	return r;
325 a596b957 2022-07-14 tracey }
326 a596b957 2022-07-14 tracey 
327 a596b957 2022-07-14 tracey int
328 8d02314f 2022-09-07 op fcgi_printf(struct request *c, const char *fmt, ...)
329 8d02314f 2022-09-07 op {
330 8d02314f 2022-09-07 op 	va_list ap;
331 8d02314f 2022-09-07 op 	int r;
332 8d02314f 2022-09-07 op 
333 8d02314f 2022-09-07 op 	va_start(ap, fmt);
334 8d02314f 2022-09-07 op 	r = fcgi_vprintf(c, fmt, ap);
335 8d02314f 2022-09-07 op 	va_end(ap);
336 8d02314f 2022-09-07 op 
337 8d02314f 2022-09-07 op 	return r;
338 8d02314f 2022-09-07 op }
339 8d02314f 2022-09-07 op 
340 8d02314f 2022-09-07 op int
341 a596b957 2022-07-14 tracey fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
342 a596b957 2022-07-14 tracey {
343 3ff00ead 2022-08-09 op 	int r;
344 3ff00ead 2022-08-09 op 
345 a596b957 2022-07-14 tracey 	if (c->sock->client_status == CLIENT_DISCONNECT)
346 a596b957 2022-07-14 tracey 		return -1;
347 a596b957 2022-07-14 tracey 
348 9dd0e5e9 2022-07-28 op 	if (data == NULL || len == 0)
349 a596b957 2022-07-14 tracey 		return 0;
350 a596b957 2022-07-14 tracey 
351 3ff00ead 2022-08-09 op 	/*
352 3ff00ead 2022-08-09 op 	 * special case: send big replies -like blobs- directly
353 3ff00ead 2022-08-09 op 	 * without copying.
354 3ff00ead 2022-08-09 op 	 */
355 3ff00ead 2022-08-09 op 	if (len > sizeof(c->outbuf)) {
356 3ff00ead 2022-08-09 op 		if (c->outbuf_len > 0) {
357 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT,
358 3ff00ead 2022-08-09 op 			    c->outbuf, c->outbuf_len);
359 3ff00ead 2022-08-09 op 			c->outbuf_len = 0;
360 3ff00ead 2022-08-09 op 		}
361 3ff00ead 2022-08-09 op 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
362 3ff00ead 2022-08-09 op 	}
363 3ff00ead 2022-08-09 op 
364 3ff00ead 2022-08-09 op 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
365 3ff00ead 2022-08-09 op 		memcpy(c->outbuf + c->outbuf_len, data, len);
366 3ff00ead 2022-08-09 op 		c->outbuf_len += len;
367 3ff00ead 2022-08-09 op 		return 0;
368 3ff00ead 2022-08-09 op 	}
369 3ff00ead 2022-08-09 op 
370 3ff00ead 2022-08-09 op 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
371 3ff00ead 2022-08-09 op 	if (r == -1)
372 3ff00ead 2022-08-09 op 		return -1;
373 3ff00ead 2022-08-09 op 
374 3ff00ead 2022-08-09 op 	memcpy(c->outbuf, data, len);
375 3ff00ead 2022-08-09 op 	c->outbuf_len = len;
376 a596b957 2022-07-14 tracey 	return 0;
377 a596b957 2022-07-14 tracey }
378 a596b957 2022-07-14 tracey 
379 3ff00ead 2022-08-09 op static int
380 311b7e33 2022-08-01 op send_response(struct request *c, int type, const uint8_t *data,
381 311b7e33 2022-08-01 op     size_t len)
382 a596b957 2022-07-14 tracey {
383 311b7e33 2022-08-01 op 	static const uint8_t padding[FCGI_PADDING_SIZE];
384 311b7e33 2022-08-01 op 	struct fcgi_record_header header;
385 311b7e33 2022-08-01 op 	struct iovec iov[3];
386 a596b957 2022-07-14 tracey 	struct timespec ts;
387 cb8b8986 2022-07-28 op 	ssize_t nw;
388 311b7e33 2022-08-01 op 	size_t padded_len, tot;
389 311b7e33 2022-08-01 op 	int i, err = 0, th = 2000;
390 a596b957 2022-07-14 tracey 
391 a596b957 2022-07-14 tracey 	ts.tv_sec = 0;
392 a596b957 2022-07-14 tracey 	ts.tv_nsec = 50;
393 a596b957 2022-07-14 tracey 
394 311b7e33 2022-08-01 op 	memset(&header, 0, sizeof(header));
395 311b7e33 2022-08-01 op 	header.version = 1;
396 311b7e33 2022-08-01 op 	header.type = type;
397 311b7e33 2022-08-01 op 	header.id = htons(c->id);
398 311b7e33 2022-08-01 op 	header.content_len = htons(len);
399 a596b957 2022-07-14 tracey 
400 a596b957 2022-07-14 tracey 	/* The FastCGI spec suggests to align the output buffer */
401 311b7e33 2022-08-01 op 	tot = sizeof(header) + len;
402 311b7e33 2022-08-01 op 	padded_len = FCGI_ALIGN(tot);
403 311b7e33 2022-08-01 op 	if (padded_len > tot) {
404 311b7e33 2022-08-01 op 		header.padding_len = padded_len - tot;
405 311b7e33 2022-08-01 op 		tot += header.padding_len;
406 a596b957 2022-07-14 tracey 	}
407 a596b957 2022-07-14 tracey 
408 311b7e33 2022-08-01 op 	iov[0].iov_base = &header;
409 311b7e33 2022-08-01 op 	iov[0].iov_len = sizeof(header);
410 a596b957 2022-07-14 tracey 
411 311b7e33 2022-08-01 op 	iov[1].iov_base = (void *)data;
412 311b7e33 2022-08-01 op 	iov[1].iov_len = len;
413 311b7e33 2022-08-01 op 
414 311b7e33 2022-08-01 op 	iov[2].iov_base = (void *)padding;
415 311b7e33 2022-08-01 op 	iov[2].iov_len = header.padding_len;
416 311b7e33 2022-08-01 op 
417 311b7e33 2022-08-01 op 	dump_fcgi_record("resp ", &header);
418 311b7e33 2022-08-01 op 
419 a596b957 2022-07-14 tracey 	/*
420 a596b957 2022-07-14 tracey 	 * XXX: add some simple write heuristics here
421 a596b957 2022-07-14 tracey 	 * On slower VMs, spotty connections, etc., we don't want to go right to
422 a596b957 2022-07-14 tracey 	 * disconnect. Let's at least try to write the data a few times before
423 a596b957 2022-07-14 tracey 	 * giving up.
424 a596b957 2022-07-14 tracey 	 */
425 311b7e33 2022-08-01 op 	while (tot > 0) {
426 311b7e33 2022-08-01 op 		nw = writev(c->fd, iov, nitems(iov));
427 cb8b8986 2022-07-28 op 		if (nw == 0) {
428 cb8b8986 2022-07-28 op 			c->sock->client_status = CLIENT_DISCONNECT;
429 cb8b8986 2022-07-28 op 			break;
430 cb8b8986 2022-07-28 op 		}
431 cb8b8986 2022-07-28 op 		if (nw == -1) {
432 cb8b8986 2022-07-28 op 			err++;
433 cb8b8986 2022-07-28 op 			if (errno == EAGAIN && err < th) {
434 cb8b8986 2022-07-28 op 				nanosleep(&ts, NULL);
435 cb8b8986 2022-07-28 op 				continue;
436 cb8b8986 2022-07-28 op 			}
437 b43fa49a 2022-07-28 op 			log_warn("%s: write failure", __func__);
438 a596b957 2022-07-14 tracey 			c->sock->client_status = CLIENT_DISCONNECT;
439 3ff00ead 2022-08-09 op 			return -1;
440 a596b957 2022-07-14 tracey 		}
441 cb8b8986 2022-07-28 op 
442 311b7e33 2022-08-01 op 		if (nw != tot)
443 311b7e33 2022-08-01 op 			log_debug("%s: partial write: %zu vs %zu", __func__,
444 311b7e33 2022-08-01 op 			    nw, tot);
445 311b7e33 2022-08-01 op 
446 311b7e33 2022-08-01 op 		tot -= nw;
447 311b7e33 2022-08-01 op 		for (i = 0; i < nitems(iov); ++i) {
448 311b7e33 2022-08-01 op 			if (nw < iov[i].iov_len) {
449 311b7e33 2022-08-01 op 				iov[i].iov_base += nw;
450 311b7e33 2022-08-01 op 				iov[i].iov_len -= nw;
451 311b7e33 2022-08-01 op 				break;
452 311b7e33 2022-08-01 op 			}
453 311b7e33 2022-08-01 op 			nw -= iov[i].iov_len;
454 311b7e33 2022-08-01 op 			iov[i].iov_len = 0;
455 311b7e33 2022-08-01 op 		}
456 a596b957 2022-07-14 tracey 	}
457 3ff00ead 2022-08-09 op 
458 3ff00ead 2022-08-09 op 	return 0;
459 311b7e33 2022-08-01 op }
460 a596b957 2022-07-14 tracey 
461 3ff00ead 2022-08-09 op int
462 311b7e33 2022-08-01 op fcgi_send_response(struct request *c, int type, const void *data,
463 311b7e33 2022-08-01 op     size_t len)
464 311b7e33 2022-08-01 op {
465 3ff00ead 2022-08-09 op 	if (c->sock->client_status == CLIENT_DISCONNECT)
466 3ff00ead 2022-08-09 op 		return -1;
467 3ff00ead 2022-08-09 op 
468 311b7e33 2022-08-01 op 	while (len > FCGI_CONTENT_SIZE) {
469 3ff00ead 2022-08-09 op 		if (send_response(c, type, data, len) == -1)
470 3ff00ead 2022-08-09 op 			return -1;
471 311b7e33 2022-08-01 op 
472 311b7e33 2022-08-01 op 		data += FCGI_CONTENT_SIZE;
473 311b7e33 2022-08-01 op 		len -= FCGI_CONTENT_SIZE;
474 311b7e33 2022-08-01 op 	}
475 311b7e33 2022-08-01 op 
476 311b7e33 2022-08-01 op 	if (len == 0)
477 3ff00ead 2022-08-09 op 		return 0;
478 311b7e33 2022-08-01 op 
479 3ff00ead 2022-08-09 op 	return send_response(c, type, data, len);
480 a596b957 2022-07-14 tracey }
481 a596b957 2022-07-14 tracey 
482 a596b957 2022-07-14 tracey void
483 a596b957 2022-07-14 tracey fcgi_create_end_record(struct request *c)
484 a596b957 2022-07-14 tracey {
485 311b7e33 2022-08-01 op 	struct fcgi_end_request_body end_request;
486 a596b957 2022-07-14 tracey 
487 311b7e33 2022-08-01 op 	memset(&end_request, 0, sizeof(end_request));
488 311b7e33 2022-08-01 op 	end_request.app_status = htonl(0); /* script status */
489 311b7e33 2022-08-01 op 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
490 311b7e33 2022-08-01 op 
491 311b7e33 2022-08-01 op 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
492 311b7e33 2022-08-01 op 	    sizeof(end_request));
493 a596b957 2022-07-14 tracey }
494 a596b957 2022-07-14 tracey 
495 a596b957 2022-07-14 tracey void
496 a596b957 2022-07-14 tracey fcgi_cleanup_request(struct request *c)
497 a596b957 2022-07-14 tracey {
498 a596b957 2022-07-14 tracey 	cgi_inflight--;
499 a596b957 2022-07-14 tracey 	client_cnt--;
500 a596b957 2022-07-14 tracey 
501 a596b957 2022-07-14 tracey 	evtimer_del(&c->tmo);
502 a596b957 2022-07-14 tracey 	if (event_initialized(&c->ev))
503 a596b957 2022-07-14 tracey 		event_del(&c->ev);
504 a596b957 2022-07-14 tracey 
505 a596b957 2022-07-14 tracey 	close(c->fd);
506 ed619ca0 2022-12-14 op 	template_free(c->tp);
507 a596b957 2022-07-14 tracey 	gotweb_free_transport(c->t);
508 a596b957 2022-07-14 tracey 	free(c);
509 a596b957 2022-07-14 tracey }
510 a596b957 2022-07-14 tracey 
511 a596b957 2022-07-14 tracey void
512 a596b957 2022-07-14 tracey dump_fcgi_record(const char *p, struct fcgi_record_header *h)
513 a596b957 2022-07-14 tracey {
514 a596b957 2022-07-14 tracey 	dump_fcgi_record_header(p, h);
515 a596b957 2022-07-14 tracey 
516 a596b957 2022-07-14 tracey 	if (h->type == FCGI_BEGIN_REQUEST)
517 a596b957 2022-07-14 tracey 		dump_fcgi_begin_request_body(p,
518 a596b957 2022-07-14 tracey 		    (struct fcgi_begin_request_body *)(h + 1));
519 a596b957 2022-07-14 tracey 	else if (h->type == FCGI_END_REQUEST)
520 a596b957 2022-07-14 tracey 		dump_fcgi_end_request_body(p,
521 a596b957 2022-07-14 tracey 		    (struct fcgi_end_request_body *)(h + 1));
522 a596b957 2022-07-14 tracey }
523 a596b957 2022-07-14 tracey 
524 a596b957 2022-07-14 tracey void
525 a596b957 2022-07-14 tracey dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
526 a596b957 2022-07-14 tracey {
527 a596b957 2022-07-14 tracey 	log_debug("%sversion:         %d", p, h->version);
528 a596b957 2022-07-14 tracey 	log_debug("%stype:            %d", p, h->type);
529 a596b957 2022-07-14 tracey 	log_debug("%srequestId:       %d", p, ntohs(h->id));
530 a596b957 2022-07-14 tracey 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
531 a596b957 2022-07-14 tracey 	log_debug("%spaddingLength:   %d", p, h->padding_len);
532 a596b957 2022-07-14 tracey 	log_debug("%sreserved:        %d", p, h->reserved);
533 a596b957 2022-07-14 tracey }
534 a596b957 2022-07-14 tracey 
535 a596b957 2022-07-14 tracey void
536 a596b957 2022-07-14 tracey dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
537 a596b957 2022-07-14 tracey {
538 a596b957 2022-07-14 tracey 	log_debug("%srole             %d", p, ntohs(b->role));
539 a596b957 2022-07-14 tracey 	log_debug("%sflags            %d", p, b->flags);
540 a596b957 2022-07-14 tracey }
541 a596b957 2022-07-14 tracey 
542 a596b957 2022-07-14 tracey void
543 a596b957 2022-07-14 tracey dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
544 a596b957 2022-07-14 tracey {
545 a596b957 2022-07-14 tracey 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
546 a596b957 2022-07-14 tracey 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
547 a596b957 2022-07-14 tracey }