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