1 8a35f56c 2022-07-16 thomas /*
  2 8a35f56c 2022-07-16 thomas  * Copyright (c) 2020-2022 Tracey Emery <tracey@traceyemery.net>
  3 8a35f56c 2022-07-16 thomas  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
  4 8a35f56c 2022-07-16 thomas  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
  5 8a35f56c 2022-07-16 thomas  *
  6 8a35f56c 2022-07-16 thomas  * Permission to use, copy, modify, and distribute this software for any
  7 8a35f56c 2022-07-16 thomas  * purpose with or without fee is hereby granted, provided that the above
  8 8a35f56c 2022-07-16 thomas  * copyright notice and this permission notice appear in all copies.
  9 8a35f56c 2022-07-16 thomas  *
 10 8a35f56c 2022-07-16 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11 8a35f56c 2022-07-16 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12 8a35f56c 2022-07-16 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13 8a35f56c 2022-07-16 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14 8a35f56c 2022-07-16 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15 8a35f56c 2022-07-16 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16 8a35f56c 2022-07-16 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17 8a35f56c 2022-07-16 thomas  */
 18 4fccd2fe 2023-03-08 thomas 
 19 4fccd2fe 2023-03-08 thomas #include "got_compat.h"
 20 8a35f56c 2022-07-16 thomas 
 21 8a35f56c 2022-07-16 thomas #include <arpa/inet.h>
 22 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 23 8a35f56c 2022-07-16 thomas #include <sys/socket.h>
 24 8a35f56c 2022-07-16 thomas #include <sys/types.h>
 25 0335d24d 2022-08-06 thomas #include <sys/uio.h>
 26 8a35f56c 2022-07-16 thomas 
 27 8a35f56c 2022-07-16 thomas #include <errno.h>
 28 8a35f56c 2022-07-16 thomas #include <event.h>
 29 79393471 2022-08-27 thomas #include <imsg.h>
 30 79393471 2022-08-27 thomas #include <stdarg.h>
 31 8a35f56c 2022-07-16 thomas #include <stdlib.h>
 32 8a35f56c 2022-07-16 thomas #include <stdio.h>
 33 8a35f56c 2022-07-16 thomas #include <string.h>
 34 8a35f56c 2022-07-16 thomas #include <time.h>
 35 8a35f56c 2022-07-16 thomas #include <unistd.h>
 36 8a35f56c 2022-07-16 thomas 
 37 8a35f56c 2022-07-16 thomas #include "got_error.h"
 38 161663e7 2023-03-11 thomas #include "got_reference.h"
 39 8a35f56c 2022-07-16 thomas 
 40 8a35f56c 2022-07-16 thomas #include "proc.h"
 41 8a35f56c 2022-07-16 thomas #include "gotwebd.h"
 42 e7e5fa49 2022-12-30 thomas #include "tmpl.h"
 43 8a35f56c 2022-07-16 thomas 
 44 8a35f56c 2022-07-16 thomas size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 45 8a35f56c 2022-07-16 thomas void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 46 8a35f56c 2022-07-16 thomas 	    uint16_t);
 47 8a35f56c 2022-07-16 thomas void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 48 e5539f76 2022-08-10 thomas int	 fcgi_send_response(struct request *, int, const void *, size_t);
 49 8a35f56c 2022-07-16 thomas 
 50 8a35f56c 2022-07-16 thomas void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 51 8a35f56c 2022-07-16 thomas void	 dump_fcgi_begin_request_body(const char *,
 52 8a35f56c 2022-07-16 thomas 	    struct fcgi_begin_request_body *);
 53 8a35f56c 2022-07-16 thomas void	 dump_fcgi_end_request_body(const char *,
 54 8a35f56c 2022-07-16 thomas 	    struct fcgi_end_request_body *);
 55 8a35f56c 2022-07-16 thomas 
 56 8a35f56c 2022-07-16 thomas extern int	 cgi_inflight;
 57 8a35f56c 2022-07-16 thomas extern volatile int client_cnt;
 58 8a35f56c 2022-07-16 thomas 
 59 8a35f56c 2022-07-16 thomas void
 60 8a35f56c 2022-07-16 thomas fcgi_request(int fd, short events, void *arg)
 61 8a35f56c 2022-07-16 thomas {
 62 8a35f56c 2022-07-16 thomas 	struct request *c = arg;
 63 8a35f56c 2022-07-16 thomas 	ssize_t n;
 64 8a35f56c 2022-07-16 thomas 	size_t parsed = 0;
 65 8a35f56c 2022-07-16 thomas 
 66 8a35f56c 2022-07-16 thomas 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 67 8a35f56c 2022-07-16 thomas 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 68 8a35f56c 2022-07-16 thomas 
 69 8a35f56c 2022-07-16 thomas 	switch (n) {
 70 8a35f56c 2022-07-16 thomas 	case -1:
 71 8a35f56c 2022-07-16 thomas 		switch (errno) {
 72 8a35f56c 2022-07-16 thomas 		case EINTR:
 73 8a35f56c 2022-07-16 thomas 		case EAGAIN:
 74 8a35f56c 2022-07-16 thomas 			return;
 75 8a35f56c 2022-07-16 thomas 		default:
 76 8a35f56c 2022-07-16 thomas 			goto fail;
 77 8a35f56c 2022-07-16 thomas 		}
 78 8a35f56c 2022-07-16 thomas 		break;
 79 8a35f56c 2022-07-16 thomas 
 80 8a35f56c 2022-07-16 thomas 	case 0:
 81 8a35f56c 2022-07-16 thomas 		log_debug("closed connection");
 82 8a35f56c 2022-07-16 thomas 		goto fail;
 83 8a35f56c 2022-07-16 thomas 	default:
 84 8a35f56c 2022-07-16 thomas 		break;
 85 8a35f56c 2022-07-16 thomas 	}
 86 8a35f56c 2022-07-16 thomas 
 87 8a35f56c 2022-07-16 thomas 	c->buf_len += n;
 88 8a35f56c 2022-07-16 thomas 
 89 8a35f56c 2022-07-16 thomas 	/*
 90 8a35f56c 2022-07-16 thomas 	 * Parse the records as they are received. Per the FastCGI
 91 8a35f56c 2022-07-16 thomas 	 * specification, the server need only receive the FastCGI
 92 8a35f56c 2022-07-16 thomas 	 * parameter records in full; it is free to begin execution
 93 8a35f56c 2022-07-16 thomas 	 * at that point, which is what happens here.
 94 8a35f56c 2022-07-16 thomas 	 */
 95 8a35f56c 2022-07-16 thomas 	do {
 96 8a35f56c 2022-07-16 thomas 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 97 8a35f56c 2022-07-16 thomas 		if (parsed != 0) {
 98 8a35f56c 2022-07-16 thomas 			c->buf_pos += parsed;
 99 8a35f56c 2022-07-16 thomas 			c->buf_len -= parsed;
100 8a35f56c 2022-07-16 thomas 		}
101 8a35f56c 2022-07-16 thomas 
102 2e9bd5cb 2023-03-10 thomas 		/* drop the parsed record */
103 2e9bd5cb 2023-03-10 thomas 		if (parsed != 0 && c->buf_len > 0) {
104 8a35f56c 2022-07-16 thomas 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
105 8a35f56c 2022-07-16 thomas 			c->buf_pos = 0;
106 8a35f56c 2022-07-16 thomas 		}
107 2e9bd5cb 2023-03-10 thomas 	} while (parsed > 0 && c->buf_len > 0);
108 2e9bd5cb 2023-03-10 thomas 
109 8a35f56c 2022-07-16 thomas 	return;
110 8a35f56c 2022-07-16 thomas fail:
111 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request(c);
112 8a35f56c 2022-07-16 thomas }
113 8a35f56c 2022-07-16 thomas 
114 8a35f56c 2022-07-16 thomas size_t
115 8a35f56c 2022-07-16 thomas fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
116 8a35f56c 2022-07-16 thomas {
117 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *h;
118 8a35f56c 2022-07-16 thomas 
119 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header))
120 8a35f56c 2022-07-16 thomas 		 return 0;
121 8a35f56c 2022-07-16 thomas 
122 8a35f56c 2022-07-16 thomas 	h = (struct fcgi_record_header*) buf;
123 8a35f56c 2022-07-16 thomas 
124 8a35f56c 2022-07-16 thomas 	dump_fcgi_record("", h);
125 8a35f56c 2022-07-16 thomas 
126 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
127 8a35f56c 2022-07-16 thomas 	    + h->padding_len)
128 8a35f56c 2022-07-16 thomas 		 return 0;
129 8a35f56c 2022-07-16 thomas 
130 8a35f56c 2022-07-16 thomas 	if (h->version != 1)
131 8a35f56c 2022-07-16 thomas 		log_warn("wrong version");
132 8a35f56c 2022-07-16 thomas 
133 8a35f56c 2022-07-16 thomas 	switch (h->type) {
134 8a35f56c 2022-07-16 thomas 	case FCGI_BEGIN_REQUEST:
135 8a35f56c 2022-07-16 thomas 		fcgi_parse_begin_request(buf +
136 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_record_header),
137 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
138 8a35f56c 2022-07-16 thomas 		break;
139 8a35f56c 2022-07-16 thomas 	case FCGI_PARAMS:
140 8a35f56c 2022-07-16 thomas 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
141 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
142 8a35f56c 2022-07-16 thomas 		break;
143 8a35f56c 2022-07-16 thomas 	case FCGI_STDIN:
144 8a35f56c 2022-07-16 thomas 	case FCGI_ABORT_REQUEST:
145 e5539f76 2022-08-10 thomas 		if (c->sock->client_status != CLIENT_DISCONNECT &&
146 e5539f76 2022-08-10 thomas 		    c->outbuf_len != 0) {
147 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
148 e5539f76 2022-08-10 thomas 			    c->outbuf_len);
149 e5539f76 2022-08-10 thomas 		}
150 e5539f76 2022-08-10 thomas 
151 8a35f56c 2022-07-16 thomas 		fcgi_create_end_record(c);
152 8a35f56c 2022-07-16 thomas 		fcgi_cleanup_request(c);
153 8a35f56c 2022-07-16 thomas 		return 0;
154 8a35f56c 2022-07-16 thomas 	default:
155 8a35f56c 2022-07-16 thomas 		log_warn("unimplemented type %d", h->type);
156 8a35f56c 2022-07-16 thomas 		break;
157 8a35f56c 2022-07-16 thomas 	}
158 8a35f56c 2022-07-16 thomas 
159 8a35f56c 2022-07-16 thomas 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
160 8a35f56c 2022-07-16 thomas 	    + h->padding_len);
161 8a35f56c 2022-07-16 thomas }
162 8a35f56c 2022-07-16 thomas 
163 8a35f56c 2022-07-16 thomas void
164 8a35f56c 2022-07-16 thomas fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
165 8a35f56c 2022-07-16 thomas     struct request *c, uint16_t id)
166 8a35f56c 2022-07-16 thomas {
167 8a35f56c 2022-07-16 thomas 	/* XXX -- FCGI_CANT_MPX_CONN */
168 8a35f56c 2022-07-16 thomas 	if (c->request_started) {
169 8a35f56c 2022-07-16 thomas 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
170 8a35f56c 2022-07-16 thomas 		return;
171 8a35f56c 2022-07-16 thomas 	}
172 8a35f56c 2022-07-16 thomas 
173 8a35f56c 2022-07-16 thomas 	if (n != sizeof(struct fcgi_begin_request_body)) {
174 8a35f56c 2022-07-16 thomas 		log_warn("wrong size %d != %lu", n,
175 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_begin_request_body));
176 8a35f56c 2022-07-16 thomas 		return;
177 8a35f56c 2022-07-16 thomas 	}
178 8a35f56c 2022-07-16 thomas 
179 8a35f56c 2022-07-16 thomas 	c->request_started = 1;
180 8a35f56c 2022-07-16 thomas 	c->id = id;
181 8a35f56c 2022-07-16 thomas }
182 8a35f56c 2022-07-16 thomas 
183 8a35f56c 2022-07-16 thomas void
184 8a35f56c 2022-07-16 thomas fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
185 8a35f56c 2022-07-16 thomas {
186 8a35f56c 2022-07-16 thomas 	uint32_t name_len, val_len;
187 b95d1cf6 2023-06-25 thomas 	uint8_t *val;
188 8a35f56c 2022-07-16 thomas 
189 8a35f56c 2022-07-16 thomas 	if (!c->request_started) {
190 8a35f56c 2022-07-16 thomas 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
191 8a35f56c 2022-07-16 thomas 		return;
192 8a35f56c 2022-07-16 thomas 	}
193 8a35f56c 2022-07-16 thomas 
194 8a35f56c 2022-07-16 thomas 	if (c->id != id) {
195 8a35f56c 2022-07-16 thomas 		log_warn("unexpected id, ignoring");
196 8a35f56c 2022-07-16 thomas 		return;
197 8a35f56c 2022-07-16 thomas 	}
198 8a35f56c 2022-07-16 thomas 
199 8a35f56c 2022-07-16 thomas 	if (n == 0) {
200 8a35f56c 2022-07-16 thomas 		gotweb_process_request(c);
201 8a35f56c 2022-07-16 thomas 		return;
202 8a35f56c 2022-07-16 thomas 	}
203 8a35f56c 2022-07-16 thomas 
204 8a35f56c 2022-07-16 thomas 	while (n > 0) {
205 8a35f56c 2022-07-16 thomas 		if (buf[0] >> 7 == 0) {
206 8a35f56c 2022-07-16 thomas 			name_len = buf[0];
207 8a35f56c 2022-07-16 thomas 			n--;
208 8a35f56c 2022-07-16 thomas 			buf++;
209 8a35f56c 2022-07-16 thomas 		} else {
210 8a35f56c 2022-07-16 thomas 			if (n > 3) {
211 8a35f56c 2022-07-16 thomas 				name_len = ((buf[0] & 0x7f) << 24) +
212 8a35f56c 2022-07-16 thomas 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
213 8a35f56c 2022-07-16 thomas 				n -= 4;
214 8a35f56c 2022-07-16 thomas 				buf += 4;
215 8a35f56c 2022-07-16 thomas 			} else
216 8a35f56c 2022-07-16 thomas 				return;
217 8a35f56c 2022-07-16 thomas 		}
218 8a35f56c 2022-07-16 thomas 
219 4630b4b5 2022-09-01 thomas 		if (n == 0)
220 8a35f56c 2022-07-16 thomas 			return;
221 8a35f56c 2022-07-16 thomas 
222 4630b4b5 2022-09-01 thomas 		if (buf[0] >> 7 == 0) {
223 4630b4b5 2022-09-01 thomas 			val_len = buf[0];
224 4630b4b5 2022-09-01 thomas 			n--;
225 4630b4b5 2022-09-01 thomas 			buf++;
226 4630b4b5 2022-09-01 thomas 		} else {
227 4630b4b5 2022-09-01 thomas 			if (n > 3) {
228 4630b4b5 2022-09-01 thomas 				val_len = ((buf[0] & 0x7f) << 24) +
229 4630b4b5 2022-09-01 thomas 					(buf[1] << 16) + (buf[2] << 8) +
230 4630b4b5 2022-09-01 thomas 					buf[3];
231 4630b4b5 2022-09-01 thomas 				n -= 4;
232 4630b4b5 2022-09-01 thomas 				buf += 4;
233 4630b4b5 2022-09-01 thomas 			} else
234 4630b4b5 2022-09-01 thomas 				return;
235 8a35f56c 2022-07-16 thomas 		}
236 8a35f56c 2022-07-16 thomas 
237 4630b4b5 2022-09-01 thomas 		if (n < name_len + val_len)
238 8a35f56c 2022-07-16 thomas 			return;
239 8a35f56c 2022-07-16 thomas 
240 4630b4b5 2022-09-01 thomas 		val = buf + name_len;
241 8a35f56c 2022-07-16 thomas 
242 4630b4b5 2022-09-01 thomas 		if (c->querystring[0] == '\0' &&
243 4630b4b5 2022-09-01 thomas 		    val_len < MAX_QUERYSTRING &&
244 4630b4b5 2022-09-01 thomas 		    name_len == 12 &&
245 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "QUERY_STRING", 12) == 0) {
246 4630b4b5 2022-09-01 thomas 			memcpy(c->querystring, val, val_len);
247 8a35f56c 2022-07-16 thomas 			c->querystring[val_len] = '\0';
248 8a35f56c 2022-07-16 thomas 		}
249 8a35f56c 2022-07-16 thomas 
250 3191e256 2022-12-30 thomas 		if (c->document_uri[0] == '\0' &&
251 3191e256 2022-12-30 thomas 		    val_len < MAX_DOCUMENT_URI &&
252 3191e256 2022-12-30 thomas 		    name_len == 12 &&
253 3191e256 2022-12-30 thomas 		    strncmp(buf, "DOCUMENT_URI", 12) == 0) {
254 3191e256 2022-12-30 thomas 			memcpy(c->document_uri, val, val_len);
255 3191e256 2022-12-30 thomas 			c->document_uri[val_len] = '\0';
256 8a35f56c 2022-07-16 thomas 		}
257 4630b4b5 2022-09-01 thomas 
258 4630b4b5 2022-09-01 thomas 		if (c->server_name[0] == '\0' &&
259 4630b4b5 2022-09-01 thomas 		    val_len < MAX_SERVER_NAME &&
260 4630b4b5 2022-09-01 thomas 		    name_len == 11 &&
261 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "SERVER_NAME", 11) == 0) {
262 4630b4b5 2022-09-01 thomas 			memcpy(c->server_name, val, val_len);
263 8a35f56c 2022-07-16 thomas 			c->server_name[val_len] = '\0';
264 8a35f56c 2022-07-16 thomas 		}
265 d6795e9f 2022-12-30 thomas 
266 d6795e9f 2022-12-30 thomas 		if (name_len == 5 &&
267 d6795e9f 2022-12-30 thomas 		    strncmp(buf, "HTTPS", 5) == 0)
268 d6795e9f 2022-12-30 thomas 			c->https = 1;
269 8a35f56c 2022-07-16 thomas 
270 4630b4b5 2022-09-01 thomas 		buf += name_len + val_len;
271 4630b4b5 2022-09-01 thomas 		n -= name_len - val_len;
272 8a35f56c 2022-07-16 thomas 	}
273 8a35f56c 2022-07-16 thomas }
274 8a35f56c 2022-07-16 thomas 
275 8a35f56c 2022-07-16 thomas void
276 8a35f56c 2022-07-16 thomas fcgi_timeout(int fd, short events, void *arg)
277 8a35f56c 2022-07-16 thomas {
278 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request((struct request*) arg);
279 8a35f56c 2022-07-16 thomas }
280 8a35f56c 2022-07-16 thomas 
281 8a35f56c 2022-07-16 thomas int
282 e7e5fa49 2022-12-30 thomas fcgi_puts(struct template *tp, const char *str)
283 e7e5fa49 2022-12-30 thomas {
284 e7e5fa49 2022-12-30 thomas 	if (str == NULL)
285 e7e5fa49 2022-12-30 thomas 		return 0;
286 e7e5fa49 2022-12-30 thomas 	return fcgi_gen_binary_response(tp->tp_arg, str, strlen(str));
287 e7e5fa49 2022-12-30 thomas }
288 e7e5fa49 2022-12-30 thomas 
289 e7e5fa49 2022-12-30 thomas int
290 e7e5fa49 2022-12-30 thomas fcgi_putc(struct template *tp, int ch)
291 e7e5fa49 2022-12-30 thomas {
292 e7e5fa49 2022-12-30 thomas 	uint8_t c = ch;
293 e7e5fa49 2022-12-30 thomas 	return fcgi_gen_binary_response(tp->tp_arg, &c, 1);
294 e7e5fa49 2022-12-30 thomas }
295 e7e5fa49 2022-12-30 thomas 
296 e7e5fa49 2022-12-30 thomas int
297 55144267 2022-09-07 thomas fcgi_vprintf(struct request *c, const char *fmt, va_list ap)
298 79393471 2022-08-27 thomas {
299 79393471 2022-08-27 thomas 	char *str;
300 79393471 2022-08-27 thomas 	int r;
301 79393471 2022-08-27 thomas 
302 79393471 2022-08-27 thomas 	r = vasprintf(&str, fmt, ap);
303 79393471 2022-08-27 thomas 	if (r == -1) {
304 79393471 2022-08-27 thomas 		log_warn("%s: asprintf", __func__);
305 79393471 2022-08-27 thomas 		return -1;
306 79393471 2022-08-27 thomas 	}
307 79393471 2022-08-27 thomas 
308 79393471 2022-08-27 thomas 	r = fcgi_gen_binary_response(c, str, r);
309 79393471 2022-08-27 thomas 	free(str);
310 79393471 2022-08-27 thomas 	return r;
311 79393471 2022-08-27 thomas }
312 79393471 2022-08-27 thomas 
313 79393471 2022-08-27 thomas int
314 55144267 2022-09-07 thomas fcgi_printf(struct request *c, const char *fmt, ...)
315 55144267 2022-09-07 thomas {
316 55144267 2022-09-07 thomas 	va_list ap;
317 55144267 2022-09-07 thomas 	int r;
318 55144267 2022-09-07 thomas 
319 55144267 2022-09-07 thomas 	va_start(ap, fmt);
320 55144267 2022-09-07 thomas 	r = fcgi_vprintf(c, fmt, ap);
321 55144267 2022-09-07 thomas 	va_end(ap);
322 55144267 2022-09-07 thomas 
323 55144267 2022-09-07 thomas 	return r;
324 55144267 2022-09-07 thomas }
325 55144267 2022-09-07 thomas 
326 55144267 2022-09-07 thomas int
327 8a35f56c 2022-07-16 thomas fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
328 8a35f56c 2022-07-16 thomas {
329 e5539f76 2022-08-10 thomas 	int r;
330 e5539f76 2022-08-10 thomas 
331 8a35f56c 2022-07-16 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
332 8a35f56c 2022-07-16 thomas 		return -1;
333 8a35f56c 2022-07-16 thomas 
334 0c2c6365 2022-07-28 thomas 	if (data == NULL || len == 0)
335 8a35f56c 2022-07-16 thomas 		return 0;
336 8a35f56c 2022-07-16 thomas 
337 e5539f76 2022-08-10 thomas 	/*
338 e5539f76 2022-08-10 thomas 	 * special case: send big replies -like blobs- directly
339 e5539f76 2022-08-10 thomas 	 * without copying.
340 e5539f76 2022-08-10 thomas 	 */
341 e5539f76 2022-08-10 thomas 	if (len > sizeof(c->outbuf)) {
342 e5539f76 2022-08-10 thomas 		if (c->outbuf_len > 0) {
343 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT,
344 e5539f76 2022-08-10 thomas 			    c->outbuf, c->outbuf_len);
345 e5539f76 2022-08-10 thomas 			c->outbuf_len = 0;
346 e5539f76 2022-08-10 thomas 		}
347 e5539f76 2022-08-10 thomas 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
348 e5539f76 2022-08-10 thomas 	}
349 e5539f76 2022-08-10 thomas 
350 e5539f76 2022-08-10 thomas 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
351 e5539f76 2022-08-10 thomas 		memcpy(c->outbuf + c->outbuf_len, data, len);
352 e5539f76 2022-08-10 thomas 		c->outbuf_len += len;
353 e5539f76 2022-08-10 thomas 		return 0;
354 e5539f76 2022-08-10 thomas 	}
355 e5539f76 2022-08-10 thomas 
356 e5539f76 2022-08-10 thomas 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
357 e5539f76 2022-08-10 thomas 	if (r == -1)
358 e5539f76 2022-08-10 thomas 		return -1;
359 e5539f76 2022-08-10 thomas 
360 e5539f76 2022-08-10 thomas 	memcpy(c->outbuf, data, len);
361 e5539f76 2022-08-10 thomas 	c->outbuf_len = len;
362 8a35f56c 2022-07-16 thomas 	return 0;
363 8a35f56c 2022-07-16 thomas }
364 8a35f56c 2022-07-16 thomas 
365 e5539f76 2022-08-10 thomas static int
366 0335d24d 2022-08-06 thomas send_response(struct request *c, int type, const uint8_t *data,
367 0335d24d 2022-08-06 thomas     size_t len)
368 8a35f56c 2022-07-16 thomas {
369 0335d24d 2022-08-06 thomas 	static const uint8_t padding[FCGI_PADDING_SIZE];
370 0335d24d 2022-08-06 thomas 	struct fcgi_record_header header;
371 0335d24d 2022-08-06 thomas 	struct iovec iov[3];
372 8a35f56c 2022-07-16 thomas 	struct timespec ts;
373 a5a99557 2022-07-29 thomas 	ssize_t nw;
374 0335d24d 2022-08-06 thomas 	size_t padded_len, tot;
375 0335d24d 2022-08-06 thomas 	int i, err = 0, th = 2000;
376 8a35f56c 2022-07-16 thomas 
377 8a35f56c 2022-07-16 thomas 	ts.tv_sec = 0;
378 8a35f56c 2022-07-16 thomas 	ts.tv_nsec = 50;
379 8a35f56c 2022-07-16 thomas 
380 0335d24d 2022-08-06 thomas 	memset(&header, 0, sizeof(header));
381 0335d24d 2022-08-06 thomas 	header.version = 1;
382 0335d24d 2022-08-06 thomas 	header.type = type;
383 0335d24d 2022-08-06 thomas 	header.id = htons(c->id);
384 0335d24d 2022-08-06 thomas 	header.content_len = htons(len);
385 8a35f56c 2022-07-16 thomas 
386 8a35f56c 2022-07-16 thomas 	/* The FastCGI spec suggests to align the output buffer */
387 0335d24d 2022-08-06 thomas 	tot = sizeof(header) + len;
388 0335d24d 2022-08-06 thomas 	padded_len = FCGI_ALIGN(tot);
389 0335d24d 2022-08-06 thomas 	if (padded_len > tot) {
390 0335d24d 2022-08-06 thomas 		header.padding_len = padded_len - tot;
391 0335d24d 2022-08-06 thomas 		tot += header.padding_len;
392 8a35f56c 2022-07-16 thomas 	}
393 8a35f56c 2022-07-16 thomas 
394 0335d24d 2022-08-06 thomas 	iov[0].iov_base = &header;
395 0335d24d 2022-08-06 thomas 	iov[0].iov_len = sizeof(header);
396 8a35f56c 2022-07-16 thomas 
397 0335d24d 2022-08-06 thomas 	iov[1].iov_base = (void *)data;
398 0335d24d 2022-08-06 thomas 	iov[1].iov_len = len;
399 0335d24d 2022-08-06 thomas 
400 0335d24d 2022-08-06 thomas 	iov[2].iov_base = (void *)padding;
401 0335d24d 2022-08-06 thomas 	iov[2].iov_len = header.padding_len;
402 0335d24d 2022-08-06 thomas 
403 0335d24d 2022-08-06 thomas 	dump_fcgi_record("resp ", &header);
404 0335d24d 2022-08-06 thomas 
405 8a35f56c 2022-07-16 thomas 	/*
406 8a35f56c 2022-07-16 thomas 	 * XXX: add some simple write heuristics here
407 8a35f56c 2022-07-16 thomas 	 * On slower VMs, spotty connections, etc., we don't want to go right to
408 8a35f56c 2022-07-16 thomas 	 * disconnect. Let's at least try to write the data a few times before
409 8a35f56c 2022-07-16 thomas 	 * giving up.
410 8a35f56c 2022-07-16 thomas 	 */
411 0335d24d 2022-08-06 thomas 	while (tot > 0) {
412 0335d24d 2022-08-06 thomas 		nw = writev(c->fd, iov, nitems(iov));
413 a5a99557 2022-07-29 thomas 		if (nw == 0) {
414 a5a99557 2022-07-29 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
415 a5a99557 2022-07-29 thomas 			break;
416 a5a99557 2022-07-29 thomas 		}
417 a5a99557 2022-07-29 thomas 		if (nw == -1) {
418 a5a99557 2022-07-29 thomas 			err++;
419 a5a99557 2022-07-29 thomas 			if (errno == EAGAIN && err < th) {
420 a5a99557 2022-07-29 thomas 				nanosleep(&ts, NULL);
421 a5a99557 2022-07-29 thomas 				continue;
422 a5a99557 2022-07-29 thomas 			}
423 aa2aecab 2023-05-25 thomas 			log_debug("%s: write failure: %s", __func__,
424 aa2aecab 2023-05-25 thomas 			    strerror(errno));
425 8a35f56c 2022-07-16 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
426 e5539f76 2022-08-10 thomas 			return -1;
427 8a35f56c 2022-07-16 thomas 		}
428 a5a99557 2022-07-29 thomas 
429 0335d24d 2022-08-06 thomas 		if (nw != tot)
430 0335d24d 2022-08-06 thomas 			log_debug("%s: partial write: %zu vs %zu", __func__,
431 0335d24d 2022-08-06 thomas 			    nw, tot);
432 0335d24d 2022-08-06 thomas 
433 0335d24d 2022-08-06 thomas 		tot -= nw;
434 0335d24d 2022-08-06 thomas 		for (i = 0; i < nitems(iov); ++i) {
435 0335d24d 2022-08-06 thomas 			if (nw < iov[i].iov_len) {
436 0335d24d 2022-08-06 thomas 				iov[i].iov_base += nw;
437 0335d24d 2022-08-06 thomas 				iov[i].iov_len -= nw;
438 0335d24d 2022-08-06 thomas 				break;
439 0335d24d 2022-08-06 thomas 			}
440 0335d24d 2022-08-06 thomas 			nw -= iov[i].iov_len;
441 0335d24d 2022-08-06 thomas 			iov[i].iov_len = 0;
442 0335d24d 2022-08-06 thomas 		}
443 8a35f56c 2022-07-16 thomas 	}
444 e5539f76 2022-08-10 thomas 
445 e5539f76 2022-08-10 thomas 	return 0;
446 0335d24d 2022-08-06 thomas }
447 8a35f56c 2022-07-16 thomas 
448 e5539f76 2022-08-10 thomas int
449 0335d24d 2022-08-06 thomas fcgi_send_response(struct request *c, int type, const void *data,
450 0335d24d 2022-08-06 thomas     size_t len)
451 0335d24d 2022-08-06 thomas {
452 e5539f76 2022-08-10 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
453 e5539f76 2022-08-10 thomas 		return -1;
454 e5539f76 2022-08-10 thomas 
455 0335d24d 2022-08-06 thomas 	while (len > FCGI_CONTENT_SIZE) {
456 e5539f76 2022-08-10 thomas 		if (send_response(c, type, data, len) == -1)
457 e5539f76 2022-08-10 thomas 			return -1;
458 0335d24d 2022-08-06 thomas 
459 0335d24d 2022-08-06 thomas 		data += FCGI_CONTENT_SIZE;
460 0335d24d 2022-08-06 thomas 		len -= FCGI_CONTENT_SIZE;
461 0335d24d 2022-08-06 thomas 	}
462 0335d24d 2022-08-06 thomas 
463 0335d24d 2022-08-06 thomas 	if (len == 0)
464 e5539f76 2022-08-10 thomas 		return 0;
465 0335d24d 2022-08-06 thomas 
466 e5539f76 2022-08-10 thomas 	return send_response(c, type, data, len);
467 8a35f56c 2022-07-16 thomas }
468 8a35f56c 2022-07-16 thomas 
469 8a35f56c 2022-07-16 thomas void
470 8a35f56c 2022-07-16 thomas fcgi_create_end_record(struct request *c)
471 8a35f56c 2022-07-16 thomas {
472 0335d24d 2022-08-06 thomas 	struct fcgi_end_request_body end_request;
473 8a35f56c 2022-07-16 thomas 
474 0335d24d 2022-08-06 thomas 	memset(&end_request, 0, sizeof(end_request));
475 0335d24d 2022-08-06 thomas 	end_request.app_status = htonl(0); /* script status */
476 0335d24d 2022-08-06 thomas 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
477 0335d24d 2022-08-06 thomas 
478 0335d24d 2022-08-06 thomas 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
479 0335d24d 2022-08-06 thomas 	    sizeof(end_request));
480 8a35f56c 2022-07-16 thomas }
481 8a35f56c 2022-07-16 thomas 
482 8a35f56c 2022-07-16 thomas void
483 8a35f56c 2022-07-16 thomas fcgi_cleanup_request(struct request *c)
484 8a35f56c 2022-07-16 thomas {
485 8a35f56c 2022-07-16 thomas 	cgi_inflight--;
486 8a35f56c 2022-07-16 thomas 	client_cnt--;
487 8a35f56c 2022-07-16 thomas 
488 8a35f56c 2022-07-16 thomas 	evtimer_del(&c->tmo);
489 8a35f56c 2022-07-16 thomas 	if (event_initialized(&c->ev))
490 8a35f56c 2022-07-16 thomas 		event_del(&c->ev);
491 8a35f56c 2022-07-16 thomas 
492 8a35f56c 2022-07-16 thomas 	close(c->fd);
493 e7e5fa49 2022-12-30 thomas 	template_free(c->tp);
494 2e9bd5cb 2023-03-10 thomas 	if (c->t != NULL)
495 2e9bd5cb 2023-03-10 thomas 		gotweb_free_transport(c->t);
496 8a35f56c 2022-07-16 thomas 	free(c);
497 8a35f56c 2022-07-16 thomas }
498 8a35f56c 2022-07-16 thomas 
499 8a35f56c 2022-07-16 thomas void
500 8a35f56c 2022-07-16 thomas dump_fcgi_record(const char *p, struct fcgi_record_header *h)
501 8a35f56c 2022-07-16 thomas {
502 8a35f56c 2022-07-16 thomas 	dump_fcgi_record_header(p, h);
503 8a35f56c 2022-07-16 thomas 
504 8a35f56c 2022-07-16 thomas 	if (h->type == FCGI_BEGIN_REQUEST)
505 8a35f56c 2022-07-16 thomas 		dump_fcgi_begin_request_body(p,
506 8a35f56c 2022-07-16 thomas 		    (struct fcgi_begin_request_body *)(h + 1));
507 8a35f56c 2022-07-16 thomas 	else if (h->type == FCGI_END_REQUEST)
508 8a35f56c 2022-07-16 thomas 		dump_fcgi_end_request_body(p,
509 8a35f56c 2022-07-16 thomas 		    (struct fcgi_end_request_body *)(h + 1));
510 8a35f56c 2022-07-16 thomas }
511 8a35f56c 2022-07-16 thomas 
512 8a35f56c 2022-07-16 thomas void
513 8a35f56c 2022-07-16 thomas dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
514 8a35f56c 2022-07-16 thomas {
515 8a35f56c 2022-07-16 thomas 	log_debug("%sversion:         %d", p, h->version);
516 8a35f56c 2022-07-16 thomas 	log_debug("%stype:            %d", p, h->type);
517 8a35f56c 2022-07-16 thomas 	log_debug("%srequestId:       %d", p, ntohs(h->id));
518 8a35f56c 2022-07-16 thomas 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
519 8a35f56c 2022-07-16 thomas 	log_debug("%spaddingLength:   %d", p, h->padding_len);
520 8a35f56c 2022-07-16 thomas 	log_debug("%sreserved:        %d", p, h->reserved);
521 8a35f56c 2022-07-16 thomas }
522 8a35f56c 2022-07-16 thomas 
523 8a35f56c 2022-07-16 thomas void
524 8a35f56c 2022-07-16 thomas dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
525 8a35f56c 2022-07-16 thomas {
526 8a35f56c 2022-07-16 thomas 	log_debug("%srole             %d", p, ntohs(b->role));
527 8a35f56c 2022-07-16 thomas 	log_debug("%sflags            %d", p, b->flags);
528 8a35f56c 2022-07-16 thomas }
529 8a35f56c 2022-07-16 thomas 
530 8a35f56c 2022-07-16 thomas void
531 8a35f56c 2022-07-16 thomas dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
532 8a35f56c 2022-07-16 thomas {
533 8a35f56c 2022-07-16 thomas 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
534 8a35f56c 2022-07-16 thomas 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
535 8a35f56c 2022-07-16 thomas }