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 
177 a596b957 2022-07-14 tracey 	c->id = id;
178 a596b957 2022-07-14 tracey 	SLIST_INIT(&c->env);
179 a596b957 2022-07-14 tracey 	c->env_count = 0;
180 a596b957 2022-07-14 tracey }
181 a596b957 2022-07-14 tracey 
182 a596b957 2022-07-14 tracey void
183 a596b957 2022-07-14 tracey fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
184 a596b957 2022-07-14 tracey {
185 a596b957 2022-07-14 tracey 	struct env_val *env_entry;
186 a596b957 2022-07-14 tracey 	uint32_t name_len, val_len;
187 a596b957 2022-07-14 tracey 	uint8_t *sd, *dr_buf;
188 a596b957 2022-07-14 tracey 
189 a596b957 2022-07-14 tracey 	if (!c->request_started) {
190 a596b957 2022-07-14 tracey 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
191 a596b957 2022-07-14 tracey 		return;
192 a596b957 2022-07-14 tracey 	}
193 a596b957 2022-07-14 tracey 
194 a596b957 2022-07-14 tracey 	if (c->id != id) {
195 a596b957 2022-07-14 tracey 		log_warn("unexpected id, ignoring");
196 a596b957 2022-07-14 tracey 		return;
197 a596b957 2022-07-14 tracey 	}
198 a596b957 2022-07-14 tracey 
199 a596b957 2022-07-14 tracey 	if (n == 0) {
200 a596b957 2022-07-14 tracey 		gotweb_process_request(c);
201 a596b957 2022-07-14 tracey 		return;
202 a596b957 2022-07-14 tracey 	}
203 a596b957 2022-07-14 tracey 
204 a596b957 2022-07-14 tracey 	while (n > 0) {
205 a596b957 2022-07-14 tracey 		if (buf[0] >> 7 == 0) {
206 a596b957 2022-07-14 tracey 			name_len = buf[0];
207 a596b957 2022-07-14 tracey 			n--;
208 a596b957 2022-07-14 tracey 			buf++;
209 a596b957 2022-07-14 tracey 		} else {
210 a596b957 2022-07-14 tracey 			if (n > 3) {
211 a596b957 2022-07-14 tracey 				name_len = ((buf[0] & 0x7f) << 24) +
212 a596b957 2022-07-14 tracey 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
213 a596b957 2022-07-14 tracey 				n -= 4;
214 a596b957 2022-07-14 tracey 				buf += 4;
215 a596b957 2022-07-14 tracey 			} else
216 a596b957 2022-07-14 tracey 				return;
217 a596b957 2022-07-14 tracey 		}
218 a596b957 2022-07-14 tracey 
219 a596b957 2022-07-14 tracey 		if (n > 0) {
220 a596b957 2022-07-14 tracey 			if (buf[0] >> 7 == 0) {
221 a596b957 2022-07-14 tracey 				val_len = buf[0];
222 a596b957 2022-07-14 tracey 				n--;
223 a596b957 2022-07-14 tracey 				buf++;
224 a596b957 2022-07-14 tracey 			} else {
225 a596b957 2022-07-14 tracey 				if (n > 3) {
226 a596b957 2022-07-14 tracey 					val_len = ((buf[0] & 0x7f) << 24) +
227 a596b957 2022-07-14 tracey 					    (buf[1] << 16) + (buf[2] << 8) +
228 a596b957 2022-07-14 tracey 					     buf[3];
229 a596b957 2022-07-14 tracey 					n -= 4;
230 a596b957 2022-07-14 tracey 					buf += 4;
231 a596b957 2022-07-14 tracey 				} else
232 a596b957 2022-07-14 tracey 					return;
233 a596b957 2022-07-14 tracey 			}
234 a596b957 2022-07-14 tracey 		} else
235 a596b957 2022-07-14 tracey 			return;
236 a596b957 2022-07-14 tracey 
237 a596b957 2022-07-14 tracey 		if (n < name_len + val_len)
238 a596b957 2022-07-14 tracey 			return;
239 a596b957 2022-07-14 tracey 
240 a596b957 2022-07-14 tracey 		if ((env_entry = malloc(sizeof(struct env_val))) == NULL) {
241 a596b957 2022-07-14 tracey 			log_warn("cannot malloc 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 		if ((env_entry->val = calloc(sizeof(char), name_len + val_len +
246 a596b957 2022-07-14 tracey 		    2)) == NULL) {
247 a596b957 2022-07-14 tracey 			log_warn("cannot allocate env_entry->val");
248 a596b957 2022-07-14 tracey 			free(env_entry);
249 a596b957 2022-07-14 tracey 			return;
250 a596b957 2022-07-14 tracey 		}
251 a596b957 2022-07-14 tracey 
252 a596b957 2022-07-14 tracey 		bcopy(buf, env_entry->val, name_len);
253 a596b957 2022-07-14 tracey 		buf += name_len;
254 a596b957 2022-07-14 tracey 		n -= name_len;
255 a596b957 2022-07-14 tracey 
256 a596b957 2022-07-14 tracey 		env_entry->val[name_len] = '\0';
257 a596b957 2022-07-14 tracey 		if (val_len < MAX_QUERYSTRING && strcmp(env_entry->val,
258 a596b957 2022-07-14 tracey 		    "QUERY_STRING") == 0 && c->querystring[0] == '\0') {
259 a596b957 2022-07-14 tracey 			bcopy(buf, c->querystring, val_len);
260 a596b957 2022-07-14 tracey 			c->querystring[val_len] = '\0';
261 a596b957 2022-07-14 tracey 		}
262 a596b957 2022-07-14 tracey 		if (val_len < GOTWEBD_MAXTEXT && strcmp(env_entry->val,
263 a596b957 2022-07-14 tracey 		    "HTTP_HOST") == 0 && c->http_host[0] == '\0') {
264 a596b957 2022-07-14 tracey 
265 a596b957 2022-07-14 tracey 			/*
266 a596b957 2022-07-14 tracey 			 * lazily get subdomain
267 a596b957 2022-07-14 tracey 			 * will only get domain if no subdomain exists
268 a596b957 2022-07-14 tracey 			 * this can still work if gotweb server name is the same
269 a596b957 2022-07-14 tracey 			 */
270 a596b957 2022-07-14 tracey 			sd = strchr(buf, '.');
271 a596b957 2022-07-14 tracey 			if (sd)
272 a596b957 2022-07-14 tracey 				*sd = '\0';
273 a596b957 2022-07-14 tracey 
274 a596b957 2022-07-14 tracey 			bcopy(buf, c->http_host, val_len);
275 a596b957 2022-07-14 tracey 			c->http_host[val_len] = '\0';
276 a596b957 2022-07-14 tracey 		}
277 a596b957 2022-07-14 tracey 		if (val_len < MAX_DOCUMENT_ROOT && strcmp(env_entry->val,
278 a596b957 2022-07-14 tracey 		    "DOCUMENT_ROOT") == 0 && c->document_root[0] == '\0') {
279 a596b957 2022-07-14 tracey 
280 a596b957 2022-07-14 tracey 			/* drop first char, as it's always / */
281 a596b957 2022-07-14 tracey 			dr_buf = &buf[1];
282 a596b957 2022-07-14 tracey 
283 a596b957 2022-07-14 tracey 			bcopy(dr_buf, c->document_root, val_len - 1);
284 a596b957 2022-07-14 tracey 			c->document_root[val_len] = '\0';
285 a596b957 2022-07-14 tracey 		}
286 a596b957 2022-07-14 tracey 		if (val_len < MAX_SERVER_NAME && strcmp(env_entry->val,
287 a596b957 2022-07-14 tracey 		    "SERVER_NAME") == 0 && c->server_name[0] == '\0') {
288 a596b957 2022-07-14 tracey 			/* drop first char, as it's always / */
289 a596b957 2022-07-14 tracey 
290 a596b957 2022-07-14 tracey 			bcopy(buf, c->server_name, val_len);
291 a596b957 2022-07-14 tracey 			c->server_name[val_len] = '\0';
292 a596b957 2022-07-14 tracey 		}
293 a596b957 2022-07-14 tracey 		env_entry->val[name_len] = '=';
294 a596b957 2022-07-14 tracey 
295 a596b957 2022-07-14 tracey 		bcopy(buf, (env_entry->val) + name_len + 1, val_len);
296 a596b957 2022-07-14 tracey 		buf += val_len;
297 a596b957 2022-07-14 tracey 		n -= val_len;
298 a596b957 2022-07-14 tracey 
299 a596b957 2022-07-14 tracey 		SLIST_INSERT_HEAD(&c->env, env_entry, entry);
300 a596b957 2022-07-14 tracey 		log_debug("env[%d], %s", c->env_count, env_entry->val);
301 a596b957 2022-07-14 tracey 		c->env_count++;
302 a596b957 2022-07-14 tracey 	}
303 a596b957 2022-07-14 tracey }
304 a596b957 2022-07-14 tracey 
305 a596b957 2022-07-14 tracey void
306 a596b957 2022-07-14 tracey fcgi_timeout(int fd, short events, void *arg)
307 a596b957 2022-07-14 tracey {
308 a596b957 2022-07-14 tracey 	fcgi_cleanup_request((struct request*) arg);
309 01498c42 2022-08-19 op }
310 01498c42 2022-08-19 op 
311 01498c42 2022-08-19 op int
312 01498c42 2022-08-19 op fcgi_printf(struct request *c, const char *fmt, ...)
313 01498c42 2022-08-19 op {
314 01498c42 2022-08-19 op 	va_list ap;
315 01498c42 2022-08-19 op 	char *str;
316 01498c42 2022-08-19 op 	int r;
317 01498c42 2022-08-19 op 
318 01498c42 2022-08-19 op 	va_start(ap, fmt);
319 01498c42 2022-08-19 op 	r = vasprintf(&str, fmt, ap);
320 01498c42 2022-08-19 op 	va_end(ap);
321 01498c42 2022-08-19 op 
322 01498c42 2022-08-19 op 	if (r == -1) {
323 01498c42 2022-08-19 op 		log_warn("%s: asprintf", __func__);
324 01498c42 2022-08-19 op 		return -1;
325 01498c42 2022-08-19 op 	}
326 01498c42 2022-08-19 op 
327 01498c42 2022-08-19 op 	r = fcgi_gen_binary_response(c, str, r);
328 01498c42 2022-08-19 op 	free(str);
329 01498c42 2022-08-19 op 	return r;
330 a596b957 2022-07-14 tracey }
331 a596b957 2022-07-14 tracey 
332 a596b957 2022-07-14 tracey int
333 a596b957 2022-07-14 tracey fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
334 a596b957 2022-07-14 tracey {
335 3ff00ead 2022-08-09 op 	int r;
336 3ff00ead 2022-08-09 op 
337 a596b957 2022-07-14 tracey 	if (c->sock->client_status == CLIENT_DISCONNECT)
338 a596b957 2022-07-14 tracey 		return -1;
339 a596b957 2022-07-14 tracey 
340 9dd0e5e9 2022-07-28 op 	if (data == NULL || len == 0)
341 a596b957 2022-07-14 tracey 		return 0;
342 a596b957 2022-07-14 tracey 
343 3ff00ead 2022-08-09 op 	/*
344 3ff00ead 2022-08-09 op 	 * special case: send big replies -like blobs- directly
345 3ff00ead 2022-08-09 op 	 * without copying.
346 3ff00ead 2022-08-09 op 	 */
347 3ff00ead 2022-08-09 op 	if (len > sizeof(c->outbuf)) {
348 3ff00ead 2022-08-09 op 		if (c->outbuf_len > 0) {
349 3ff00ead 2022-08-09 op 			fcgi_send_response(c, FCGI_STDOUT,
350 3ff00ead 2022-08-09 op 			    c->outbuf, c->outbuf_len);
351 3ff00ead 2022-08-09 op 			c->outbuf_len = 0;
352 3ff00ead 2022-08-09 op 		}
353 3ff00ead 2022-08-09 op 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
354 3ff00ead 2022-08-09 op 	}
355 3ff00ead 2022-08-09 op 
356 3ff00ead 2022-08-09 op 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
357 3ff00ead 2022-08-09 op 		memcpy(c->outbuf + c->outbuf_len, data, len);
358 3ff00ead 2022-08-09 op 		c->outbuf_len += len;
359 3ff00ead 2022-08-09 op 		return 0;
360 3ff00ead 2022-08-09 op 	}
361 3ff00ead 2022-08-09 op 
362 3ff00ead 2022-08-09 op 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
363 3ff00ead 2022-08-09 op 	if (r == -1)
364 3ff00ead 2022-08-09 op 		return -1;
365 3ff00ead 2022-08-09 op 
366 3ff00ead 2022-08-09 op 	memcpy(c->outbuf, data, len);
367 3ff00ead 2022-08-09 op 	c->outbuf_len = len;
368 a596b957 2022-07-14 tracey 	return 0;
369 a596b957 2022-07-14 tracey }
370 a596b957 2022-07-14 tracey 
371 3ff00ead 2022-08-09 op static int
372 311b7e33 2022-08-01 op send_response(struct request *c, int type, const uint8_t *data,
373 311b7e33 2022-08-01 op     size_t len)
374 a596b957 2022-07-14 tracey {
375 311b7e33 2022-08-01 op 	static const uint8_t padding[FCGI_PADDING_SIZE];
376 311b7e33 2022-08-01 op 	struct fcgi_record_header header;
377 311b7e33 2022-08-01 op 	struct iovec iov[3];
378 a596b957 2022-07-14 tracey 	struct timespec ts;
379 cb8b8986 2022-07-28 op 	ssize_t nw;
380 311b7e33 2022-08-01 op 	size_t padded_len, tot;
381 311b7e33 2022-08-01 op 	int i, err = 0, th = 2000;
382 a596b957 2022-07-14 tracey 
383 a596b957 2022-07-14 tracey 	ts.tv_sec = 0;
384 a596b957 2022-07-14 tracey 	ts.tv_nsec = 50;
385 a596b957 2022-07-14 tracey 
386 311b7e33 2022-08-01 op 	memset(&header, 0, sizeof(header));
387 311b7e33 2022-08-01 op 	header.version = 1;
388 311b7e33 2022-08-01 op 	header.type = type;
389 311b7e33 2022-08-01 op 	header.id = htons(c->id);
390 311b7e33 2022-08-01 op 	header.content_len = htons(len);
391 a596b957 2022-07-14 tracey 
392 a596b957 2022-07-14 tracey 	/* The FastCGI spec suggests to align the output buffer */
393 311b7e33 2022-08-01 op 	tot = sizeof(header) + len;
394 311b7e33 2022-08-01 op 	padded_len = FCGI_ALIGN(tot);
395 311b7e33 2022-08-01 op 	if (padded_len > tot) {
396 311b7e33 2022-08-01 op 		header.padding_len = padded_len - tot;
397 311b7e33 2022-08-01 op 		tot += header.padding_len;
398 a596b957 2022-07-14 tracey 	}
399 a596b957 2022-07-14 tracey 
400 311b7e33 2022-08-01 op 	iov[0].iov_base = &header;
401 311b7e33 2022-08-01 op 	iov[0].iov_len = sizeof(header);
402 a596b957 2022-07-14 tracey 
403 311b7e33 2022-08-01 op 	iov[1].iov_base = (void *)data;
404 311b7e33 2022-08-01 op 	iov[1].iov_len = len;
405 311b7e33 2022-08-01 op 
406 311b7e33 2022-08-01 op 	iov[2].iov_base = (void *)padding;
407 311b7e33 2022-08-01 op 	iov[2].iov_len = header.padding_len;
408 311b7e33 2022-08-01 op 
409 311b7e33 2022-08-01 op 	dump_fcgi_record("resp ", &header);
410 311b7e33 2022-08-01 op 
411 a596b957 2022-07-14 tracey 	/*
412 a596b957 2022-07-14 tracey 	 * XXX: add some simple write heuristics here
413 a596b957 2022-07-14 tracey 	 * On slower VMs, spotty connections, etc., we don't want to go right to
414 a596b957 2022-07-14 tracey 	 * disconnect. Let's at least try to write the data a few times before
415 a596b957 2022-07-14 tracey 	 * giving up.
416 a596b957 2022-07-14 tracey 	 */
417 311b7e33 2022-08-01 op 	while (tot > 0) {
418 311b7e33 2022-08-01 op 		nw = writev(c->fd, iov, nitems(iov));
419 cb8b8986 2022-07-28 op 		if (nw == 0) {
420 cb8b8986 2022-07-28 op 			c->sock->client_status = CLIENT_DISCONNECT;
421 cb8b8986 2022-07-28 op 			break;
422 cb8b8986 2022-07-28 op 		}
423 cb8b8986 2022-07-28 op 		if (nw == -1) {
424 cb8b8986 2022-07-28 op 			err++;
425 cb8b8986 2022-07-28 op 			if (errno == EAGAIN && err < th) {
426 cb8b8986 2022-07-28 op 				nanosleep(&ts, NULL);
427 cb8b8986 2022-07-28 op 				continue;
428 cb8b8986 2022-07-28 op 			}
429 b43fa49a 2022-07-28 op 			log_warn("%s: write failure", __func__);
430 a596b957 2022-07-14 tracey 			c->sock->client_status = CLIENT_DISCONNECT;
431 3ff00ead 2022-08-09 op 			return -1;
432 a596b957 2022-07-14 tracey 		}
433 cb8b8986 2022-07-28 op 
434 311b7e33 2022-08-01 op 		if (nw != tot)
435 311b7e33 2022-08-01 op 			log_debug("%s: partial write: %zu vs %zu", __func__,
436 311b7e33 2022-08-01 op 			    nw, tot);
437 311b7e33 2022-08-01 op 
438 311b7e33 2022-08-01 op 		tot -= nw;
439 311b7e33 2022-08-01 op 		for (i = 0; i < nitems(iov); ++i) {
440 311b7e33 2022-08-01 op 			if (nw < iov[i].iov_len) {
441 311b7e33 2022-08-01 op 				iov[i].iov_base += nw;
442 311b7e33 2022-08-01 op 				iov[i].iov_len -= nw;
443 311b7e33 2022-08-01 op 				break;
444 311b7e33 2022-08-01 op 			}
445 311b7e33 2022-08-01 op 			nw -= iov[i].iov_len;
446 311b7e33 2022-08-01 op 			iov[i].iov_len = 0;
447 311b7e33 2022-08-01 op 		}
448 a596b957 2022-07-14 tracey 	}
449 3ff00ead 2022-08-09 op 
450 3ff00ead 2022-08-09 op 	return 0;
451 311b7e33 2022-08-01 op }
452 a596b957 2022-07-14 tracey 
453 3ff00ead 2022-08-09 op int
454 311b7e33 2022-08-01 op fcgi_send_response(struct request *c, int type, const void *data,
455 311b7e33 2022-08-01 op     size_t len)
456 311b7e33 2022-08-01 op {
457 3ff00ead 2022-08-09 op 	if (c->sock->client_status == CLIENT_DISCONNECT)
458 3ff00ead 2022-08-09 op 		return -1;
459 3ff00ead 2022-08-09 op 
460 311b7e33 2022-08-01 op 	while (len > FCGI_CONTENT_SIZE) {
461 3ff00ead 2022-08-09 op 		if (send_response(c, type, data, len) == -1)
462 3ff00ead 2022-08-09 op 			return -1;
463 311b7e33 2022-08-01 op 
464 311b7e33 2022-08-01 op 		data += FCGI_CONTENT_SIZE;
465 311b7e33 2022-08-01 op 		len -= FCGI_CONTENT_SIZE;
466 311b7e33 2022-08-01 op 	}
467 311b7e33 2022-08-01 op 
468 311b7e33 2022-08-01 op 	if (len == 0)
469 3ff00ead 2022-08-09 op 		return 0;
470 311b7e33 2022-08-01 op 
471 3ff00ead 2022-08-09 op 	return send_response(c, type, data, len);
472 a596b957 2022-07-14 tracey }
473 a596b957 2022-07-14 tracey 
474 a596b957 2022-07-14 tracey void
475 a596b957 2022-07-14 tracey fcgi_create_end_record(struct request *c)
476 a596b957 2022-07-14 tracey {
477 311b7e33 2022-08-01 op 	struct fcgi_end_request_body end_request;
478 a596b957 2022-07-14 tracey 
479 311b7e33 2022-08-01 op 	memset(&end_request, 0, sizeof(end_request));
480 311b7e33 2022-08-01 op 	end_request.app_status = htonl(0); /* script status */
481 311b7e33 2022-08-01 op 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
482 311b7e33 2022-08-01 op 
483 311b7e33 2022-08-01 op 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
484 311b7e33 2022-08-01 op 	    sizeof(end_request));
485 a596b957 2022-07-14 tracey }
486 a596b957 2022-07-14 tracey 
487 a596b957 2022-07-14 tracey void
488 a596b957 2022-07-14 tracey fcgi_cleanup_request(struct request *c)
489 a596b957 2022-07-14 tracey {
490 a596b957 2022-07-14 tracey 	cgi_inflight--;
491 a596b957 2022-07-14 tracey 	client_cnt--;
492 a596b957 2022-07-14 tracey 
493 a596b957 2022-07-14 tracey 	evtimer_del(&c->tmo);
494 a596b957 2022-07-14 tracey 	if (event_initialized(&c->ev))
495 a596b957 2022-07-14 tracey 		event_del(&c->ev);
496 a596b957 2022-07-14 tracey 
497 a596b957 2022-07-14 tracey 	close(c->fd);
498 a596b957 2022-07-14 tracey 	gotweb_free_transport(c->t);
499 a596b957 2022-07-14 tracey 	free(c);
500 a596b957 2022-07-14 tracey }
501 a596b957 2022-07-14 tracey 
502 a596b957 2022-07-14 tracey void
503 a596b957 2022-07-14 tracey dump_fcgi_record(const char *p, struct fcgi_record_header *h)
504 a596b957 2022-07-14 tracey {
505 a596b957 2022-07-14 tracey 	dump_fcgi_record_header(p, h);
506 a596b957 2022-07-14 tracey 
507 a596b957 2022-07-14 tracey 	if (h->type == FCGI_BEGIN_REQUEST)
508 a596b957 2022-07-14 tracey 		dump_fcgi_begin_request_body(p,
509 a596b957 2022-07-14 tracey 		    (struct fcgi_begin_request_body *)(h + 1));
510 a596b957 2022-07-14 tracey 	else if (h->type == FCGI_END_REQUEST)
511 a596b957 2022-07-14 tracey 		dump_fcgi_end_request_body(p,
512 a596b957 2022-07-14 tracey 		    (struct fcgi_end_request_body *)(h + 1));
513 a596b957 2022-07-14 tracey }
514 a596b957 2022-07-14 tracey 
515 a596b957 2022-07-14 tracey void
516 a596b957 2022-07-14 tracey dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
517 a596b957 2022-07-14 tracey {
518 a596b957 2022-07-14 tracey 	log_debug("%sversion:         %d", p, h->version);
519 a596b957 2022-07-14 tracey 	log_debug("%stype:            %d", p, h->type);
520 a596b957 2022-07-14 tracey 	log_debug("%srequestId:       %d", p, ntohs(h->id));
521 a596b957 2022-07-14 tracey 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
522 a596b957 2022-07-14 tracey 	log_debug("%spaddingLength:   %d", p, h->padding_len);
523 a596b957 2022-07-14 tracey 	log_debug("%sreserved:        %d", p, h->reserved);
524 a596b957 2022-07-14 tracey }
525 a596b957 2022-07-14 tracey 
526 a596b957 2022-07-14 tracey void
527 a596b957 2022-07-14 tracey dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
528 a596b957 2022-07-14 tracey {
529 a596b957 2022-07-14 tracey 	log_debug("%srole             %d", p, ntohs(b->role));
530 a596b957 2022-07-14 tracey 	log_debug("%sflags            %d", p, b->flags);
531 a596b957 2022-07-14 tracey }
532 a596b957 2022-07-14 tracey 
533 a596b957 2022-07-14 tracey void
534 a596b957 2022-07-14 tracey dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
535 a596b957 2022-07-14 tracey {
536 a596b957 2022-07-14 tracey 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
537 a596b957 2022-07-14 tracey 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
538 a596b957 2022-07-14 tracey }